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• The use of polyethylene wax in EVA products 2024-10-18

  The use of polyethylene wax in EVA products is mainly reflected in the following aspects: 1. Dispersant · Polyethylene wax, especially modified polyethylene wax (such as EVA wax), is often used as a dispersant for EVA masterbatch due to its excellent dispersibility. EVA wax has a narrow molecular weight distribution, high thermal stability, and strong contact ability with various pigments, which can meet the needs of effective processing equipment and significantly improve the coloring ability of pigments and the quality of color masterbatch. 2. Lubricants: During the processing of EVA products, polyethylene wax can provide lubrication, improve the processing performance of the product, and enhance production efficiency. At the same time, it can enhance the glossiness and surface smoothness of the product, making the appearance of the product more beautiful. 3. Glossing agents and brighteners - Polyethylene wax can significantly enhance the glossiness of EVA products and increase their surface brightness. In industries such as coatings and inks, polyethylene wax is often used as a gloss or brightening agent to improve the visual effect of products. 4. Wear resistance and scratch resistance · Polyethylene wax has good wear resistance and scratch resistance, which can protect the surface of EVA products from damage. In application scenarios that require high wear resistance and scratch resistance, such as flooring, furniture, etc., the addition of polyethylene wax can significantly improve the durability of the product. 5. Other applications: Polyethylene wax can also be used to improve the printing performance of EVA products and enhance adhesion. In the hot melt adhesive industry, EVA wax is also widely used as it can provide a certain degree of adhesive strength to meet the bonding needs of specific products. 6. Safety: It is worth noting

• The influence of chlorinated polyethylene (CPE) on PVC pipes 2024-10-14

  The impact of chlorinated polyethylene (CPE) on PVC pipes is mainly reflected in the following aspects: 1、 Improving physical and mechanical properties and enhancing impact resistance: CPE, as an impact modifier for PVC, can significantly improve the impact strength of PVC pipes. Especially for CPE with a chlorine content of 36% to 38%, it is widely used as an impact modifier for PVC due to its good elasticity and compatibility with PVC. As the amount of CPE added increases, the impact strength of PVC pipes will also increase. However, it should be noted that when the amount of CPE added exceeds a certain range, the increase in impact strength will decrease. Therefore, as an impact resistant agent, the appropriate amount of CPE added is 8-10 parts. Improving tensile strength and tear strength: The addition of CPE can also enhance the tensile strength and tear strength of PVC pipes, making them more durable. Improving toughness: The addition of CPE can enhance the toughness of PVC pipes, making them less prone to fracture when subjected to external forces. 2、 Improving processing performance and promoting plasticization: The addition of CPE can promote the plasticization process of PVC pipes, shorten plasticization time, and improve production efficiency. Improving dispersion effect: CPE can form an ideal network like dispersion form in PVC, enhancing its dispersion effect in PVC and further improving the performance of PVC pipes. 3、 Improving weather resistance and aging resistance: CPE has good weather resistance and can resist the erosion of natural factors such as ultraviolet rays and wind and rain, thereby extending the service life of PVC pipes. Aging resistance: The addition of CPE can also improve the aging resistance of PVC pipes, making them less prone to aging, cracking, and other problems during long-term use. 4、 Other factors affecting flame retardancy: CPE contains chlorine element, which ha

• How to solve the production problem of PVC calcium zinc stabilizer for pipes 2024-10-09

  PVC calcium zinc stabilizer is mainly responsible for stabilizing the thermal and photostability of plastic materials in the production process of pipes, preventing the degradation and aging of plastics under high temperature and ultraviolet radiation. For specific problems in pipe production, PVC calcium zinc stabilizers can be solved through the following aspects:   Improving thermal stability 1. Absorption and dispersion of heat: Calcium zinc stabilizers can absorb and disperse heat during plastic processing, preventing plastic materials from decomposing and degrading at high temperatures, thereby improving the thermal stability of plastics. This is particularly important for the process of pipe extrusion that needs to withstand high temperatures. 2. Inhibit the HCl removal reaction: The thermal decomposition of PVC releases HCl from the heat sensitive parts. The components in the calcium zinc stabilizer can capture and neutralize this HCl, thereby preventing its automatic catalytic reaction and avoiding further degradation of PVC. Improving photostability: Calcium zinc stabilizers can absorb ultraviolet radiation and prevent degradation and aging of plastic materials caused by UV exposure, which is particularly important for outdoor pipe materials. Calcium zinc oxide stabilizer can inhibit the reaction between plastic materials and oxygen, prevent degradation and aging caused by oxidation reaction, and thus extend the service life of pipes.   Optimize processing performance 1. Improve flowability: Calcium zinc stabilizers can improve the flowability of plastics, making the extrusion process of pipes smoother and reducing production failures and downtime. 2. Improve product quality: By optimizing processing performance, the surface smoothness and dimensional accuracy of pipes can be imp

• Application of calcium zinc stabilizer 2024-08-19

  Calcium zinc stabilizer is a non-toxic stabilizer prepared by a special composite process of calcium salts, zinc salts, lubricants, antioxidants and other materials. Its main applications are extensive, mainly reflected in the following aspects: 1、 Stabilizers for PVC products Thermal stability and transparency: Calcium zinc stabilizers exhibit excellent thermal stability and transparency in PVC products, without surface precipitation or migration during use. Environmental friendliness: It can replace traditional toxic stabilizers such as lead cadmium salts and organotin compounds, meet environmental requirements, and is particularly suitable for the production of non-toxic wire and cable products. Processing performance: Calcium zinc stabilizers have good processing performance in PVC resin products, and their thermal stabilization effect is equivalent to that of lead salt stabilizers. They have wide adaptability and excellent surface smoothness of the products. 2、 Widely applicable fields Building materials: used for the production of PVC pipes, profiles, fittings, boards and other building materials, providing stable performance support. Wire and cable: In the wire and cable industry, the application of calcium zinc stabilizers can meet the hygiene requirements of non-toxic and environmentally friendly, while providing excellent thermal stability and resistance to sulfide pollution. Other plastic products: They are also widely used in the PVC product industry such as soft pipes, granulation, calendering films, toys, conveyor belts, advertising fabrics, wallpapers, etc. 3、 Performance characteristics Lubrication and coupling effect: Calcium zinc stabilizers have good lubrication and unique coupling effect, which can endow fillers with good dispersibility, enhance encapsulation with resin, improve product performance, reduce mechanical wear, and

• Characterization of Imbalance between Various Additives in PVC Foam Products 2024-08-06

  1. Stabilizer The most commonly used stabilizers on PVC foam products are lead salt stabilizers and calcium zinc stabilizers. With increasingly stringent environmental requirements and higher cost-effectiveness of calcium zinc stabilizers, their application has become more and more widespread. Insufficient stabilizer, yellowing of the board surface, paste, high brittleness of the product, reduced strength, and low foaming rate; Excessive stabilizers can cause premature decomposition of the foaming agent, leading to gas overflow from the feeding and vacuum holes, and cracks or shrinkage marks in the cavity structure; 2. External lubricant The most commonly used external lubricants on foam products are generally paraffin wax and PE wax. Paraffin wax is prone to precipitation, so PE wax is generally used. Insufficient external sliding, difficult to control temperature in zones 4 and 5 of the extruder, prone to overheating, resulting in large bubbles, series of bubbles, yellowing, and rough surface of the board; Friction shear heat increases, causing material decomposition, yellowing of the board surface, and paste; Excessive sliding and poor plasticization can cause scaling in the mold cavity and precipitation on the surface of the product, leading to white discharge, uneven wall thickness, and irregular back and forth movement of certain symptoms on the surface; 3. Internal lubricant Common internal lubricants include stearic acid, 60, monoglyceride, 316, etc. Insufficient internal lubrication, poor material dispersion, uneven plasticization, difficult to control product thickness, thick foam board in the middle and thin on both sides, and possible phenomena such as white discharge, adhesion to the mold cavity, and local overheating; Excessive internal lubrication can cause the foam product to become brittle, resulting in a decrease in he

• Losses caused by low-quality CPE in PVC processing 2024-03-25

  Chlorinated polyethylene (CPE) is a chlorinated modification product of high-density polyethylene (HDPE). As a processing modifier for PVC, the chlorine content of CPE should be between 35-38%. Due to its excellent weather resistance, cold resistance, flame resistance, oil resistance, impact resistance (CPE is an elastomer), and chemical stability, as well as its good compatibility with PVC, CPE has become the most commonly used impact toughening modifier in PVC processing. The performance of CPE is determined by two factors: 1. Molecular Configuration of HDPE Due to the different process conditions during the polymerization reaction of PE, there are certain differences in the molecular configuration and properties of its polymer HDPE. The properties of CPE after chlorination of HDPE with different properties also vary. CPE manufacturers must choose suitable HDPE special powder resins in order to produce qualified CPE resins. 2. Chlorination conditions, i.e. chlorination process CPE, as a PVC processing modifier, is usually formed by chlorination reaction using aqueous suspension chlorination method. The key conditions of this chlorination process are light energy, initiator dosage, reaction pressure, reaction temperature, reaction time, and neutralization reaction conditions. The principle of PE chlorination is relatively simple, but the chlorination mechanism is more complex. Due to the relatively small investment in equipment for producing CPE, many rudimentary small CPE production plants are already scattered throughout China. This not only causes pollution to the ecological environment, but also is one of the important reasons for the instability of CPE quality. At present, there are a large number of low-quality CPE on the market. Generally, there are two types of low-quality CPE. One is due to some production plants not having the technical conditions and outdated chlorination processe

• Common problems of PVC sheets 2024-03-21

  The vertical thickness deviation of PVC sheet is large ① The temperature control of the barrel is unstable, resulting in unstable melt flow rate. The temperature of the barrel should be adjusted to stabilize it. ② The unstable screw speed leads to unstable extrusion volume. The process parameters of the extruder should be adjusted to ensure stable extrusion. ③ The roller speed in the three roller calender is unstable. The speed of the three roller calender should be adjusted. ④ The traction speed is unstable, fluctuating fast and slow. The traction speed should be adjusted to ensure smooth operation. Uneven lateral thickness of PVC sheet ① The design of the molding mold is unreasonable, and the fabric flow in the cross-section is uneven. The mold should be modified to ensure even discharge from the mouth mold. ② The adjustment of the gap between the mold lips is unreasonable and uneven. The middle gap should be slightly smaller than the gap on both sides. ③ The gap deviation between the three rollers of the three roller calender is relatively large, and the gap between the three rollers should be made even. ④ The height selection and processing of the three rollers are unreasonable. The height of the roller surface should be appropriately adjusted. The surface of PVC sheet is rough and lacks luster ① Rough or sticky material on the three roll working surface. The working surface of the three rollers should be cleaned and polished to achieve a smooth surface. ② The roller temperature of the calender is too low, and the temperature of the three rollers should be appropriately increased. ③ The surface of the mold lip is not smooth and should be cleaned. ④ The filter screen is broken and should be replaced with a new one. The surface of the board has horizontal lines ①

• methods to improve the hardness of PVC pipes 2024-03-18

  How to improve the hardness of the PVC pipe produced if it cannot meet the standard? Mainly considering raw materials and formulas. Please refer to the following for details: 1. The precipitation volume of filling material (calcium powder) should preferably be within 2.6-3.0. To balance both hardness and tear strength, calcium powder should not exceed 25 parts. In addition, an appropriate amount of nano calcium can be added to improve the strength; 2. The selection of stabilizers is crucial. Stabilizers (lead salt stabilizers, calcium zinc stabilizers, etc.) should have good thermal stability and stable internal and external lubrication balance. Do not use stabilizers that are too cheap 3. If the stability is insufficient, a small amount of metal soap can be compensated; 4. The amount of CPE used should not be too large, as excessive CPE usage can affect the hardness of the pipe; CPE should be selected with high molecular weight, standard chlorine content, no more than 35%, and no residue; 5. Lubricants cannot be used too poorly, they must be good, and PE wax is the worst for external lubrication. The total dosage is about 1.5 parts, not too much, so that when the product deforms under external forces, the PVC molecular chain connection is not easily damaged; 6. In terms of modification, CPE+ACR system, ACR+MABS system, or CPE+MABS system can be selected. 7. Titanium dioxide can affect tear strength, so it is recommended to choose a fine one. We have done chemical products for nearly 30 years. Our main products include PVC RESIN, CPE, STABILIZER, TIO2, PE WAX, PARAFFIN WAX etc.

• Production of PVC pipes 2024-03-11

  PVC plastic is a multi-component plastic, and different additives can be added according to different uses. Due to different components, PVC products exhibit different physical and mechanical properties, which are suitable for different applications. The proportion of PVC plastic pipes in plastic pipes is relatively large. RPVC pipes are made by mixing PVC resin with stabilizers, lubricants, and other additives, and then extruding them into pellets using an extruder. They can also be extruded into shape using powder materials in one go. RPVC pipes have good chemical corrosion resistance and insulation, mainly used for conveying various fluids and as wire sleeves. RPVC pipes are easy to cut, weld, bond, heat and bend, making installation and use very convenient. SPVC pipes are made by adding a large amount of plasticizer, a certain amount of stabilizer, and other additives to PVC resin, and then extruding them into shape after granulation. SPVC pipes have excellent chemical stability, excellent electrical insulation, and good flexibility and coloring properties. This type of pipe is often used instead of rubber pipes to transport liquids and corrosive media. It is also used as cable sleeves and wire insulation pipes. We have done chemical products for over 30years. Our main products include PVC RESIN, CPE, TIO2, PE WAX, PARAFFIN WAX, STEARIC ACID, STEABILIZER ETC.

• PVC RESIN/CPE/TIO2/PARAFFIN WAX/PE WAX IN 2024 2024-02-19

  We have done chemical products for over 30 years. Our main products include PVC RESIN, CPE, PE WAX, STEARIC ACID, PARAFFIN WAX, STABILIZER ETC.

• PVC export orders slow down, domestic demand meets expectations of gold september, silver ten 2023-09-04

  PVC storage continues to decrease slightly compared to the previous month As of now, the social inventory of PVC in China is 458000 tons, a decrease of 0.95% month on month and a year-on-year increase of 23.55%; Among them, in the East China region, there were 395100 tons, a decrease of 1.35% month on month and a year-on-year increase of 27.16%; In South China, there were 62900 tons, an increase of 1.62% month on month and 4.83% year-on-year. International PVC Resin market demand slows down The demand for PVC Resin in India has slowed down, and most customers have already completed their stocking needs for September. Moreover, downstream pipeline demand is currently tepid, leading to a decrease in enthusiasm to continue hoarding inventory at current prices. At the end of the month, the demand for foreign trade terminal orders was weak. As early expectations did not materialize, the performance of industrial fundamentals was weak, market prices fluctuated and decreased, and the atmosphere for foreign trade exports slowed down. The bearish future prices exacerbated the downward trend in foreign trade export prices; During the week, relevant financial policies were released, and the macro environment for commodities was positive. The market volatility rebounded, but market transactions remained flat with limited upside potential. Domestic calcium carbide prices continue to rise This week, the domestic calcium carbide market still saw a narrow upward trend, with mainstream trade prices in the Wuhai region rising to 3250 yuan/ton, and overall supply remains tight. The production enterprises started this week with instability, and there were occasional power restrictions in the Greater Wuhai region, resulting in unstable supply. Junzheng's maintenance is approaching its end, and the external sales of calcium carbide have decreased. Downstream, there is a regional shortage

• Precautions for the production process of PVC foam board 2023-05-25

  During the extrusion process of PVC foam board, the problems encountered can be basically classified into four categories, One is the stability issue Secondly, the issue of melt strength The third issue is lubrication The fourth issue is decentralization These four types of problems, especially the first three, are mutually constrained and cross influenced, and sometimes it is difficult to distinguish them immediately from surface phenomena. It is necessary to observe and analyze the root cause of the problem in order to fundamentally solve it. Insufficient stability can affect the entire board surface, resulting in yellowing and high brittleness of the foam sheet. Insufficient melt strength can lead to large foam pores and long longitudinal bubbles in foam sheets. The direct way to determine whether the melt strength is insufficient is to press the sheet wrapped on the middle roller with your fingers behind the three rollers. When the melt strength is good, you can feel elasticity when pressing. If it is difficult to bounce after pressing, it indicates poor melt strength. Due to significant differences in screw structure and cooling methods, it is difficult to determine whether the temperature is reasonable. Generally speaking, within the allowable load of the extruder, it is better to have a lower temperature in the 3-5 zone. In order to obtain uniformly foamed products in foamed pipes, it is also necessary to ensure that

• Summary of Stabilizer for PVC Products 2023-03-02

  Heat stabilizer is one of the indispensable main auxiliaries for PVC processing. The number of parts used for PVC heat stabilizer is small, but its role is huge. The use of heat stabilizer in PVC processing can ensure that PVC is not easy to degrade and relatively stable. The commonly used heat stabilizers in PVC processing include basic lead salt stabilizer, metal soap stabilizer, organotin stabilizer, rare earth stabilizer, epoxy compound, etc. The degradation mechanism of PVC is complex, the action mechanism of different stabilizers is different, and the stabilization effect is also different. PVC stabilizer, action mechanism and application 1 Lead salt stabilizer Lead salt stabilizers can be divided into three categories: (1) Pure lead salt stabilizer is mostly a basic salt containing PbO; (2) The heat stabilizer with lubricating effect is mainly the neutral and basic salt of fatty acid; (3) Composite lead salt stabilizer, and solid and liquid composite stabilizer containing a synergistic mixture of lead salt and other stabilizers and components. Lead salt stabilizer has strong thermal stability, good dielectric properties, and low price. The reasonable ratio of lead salt stabilizer and lubricant can widen the processing temperature range of PVC resin, and the quality of processed and post-processed products is stable. It is the most commonly used stabilizer at present. Lead salt stabilizer is mainly used in hard products. Lead salt stabilizer has the characteristics of good heat stabilizer, excellent electrical performance and low price. However, lead salt is toxic and can not be used in products that contact with food, nor can it make transparent products, and it is easy to be contaminated by sulfide to generate black lead sulfide. 2 Metal soap stabilizer Stearic acid soap heat stabilizers are generally prepared by saponification of alkaline earth metals (calcium, cadmium,

• What is the difference between talc powder and calcium carbonate in application 2023-02-20

  Generally, most of the plastic masterbatches are added calcium carbonate, but they must be calcite crystal ores. Because the ores are different, although they are all calcium carbonate, some can be produced. Some cannot be produced. Talcum powder and calcium carbonate can be used. In terms of cost, calcium carbonate is lower than talcum powder. In terms of production technology, calcium carbonate is easier to process than talcum powder. Talcum powder and calcium carbonate shall be added to the polypropylene granule for packing belt, and the ratio is: polypropylene: talcum powder: calcium carbonate=70:25:5. For woven bags, calcium carbonate should be used. The addition amount can reach more than 30 portions. Pay attention to the temperature during processing. 1. Talc powder and calcium carbonate are used for filling, and their main purposes are: 1. increase dimensional stability (i.e., reduce shrinkage), 2. increase the rigidity of the material, 3. increase the heat resistance of the material, 4. reduce the cost of the material, etc., but there are also some defects: 1. increase the density, 2. poor use, impact toughness, 3. material luster has decreased. 2. Talc powder and calcium carbonate have the same particle size difference, generally 300 mesh, 600 mesh, 800 mesh, 1250 mesh and 2500 mesh, and of course, there are finer ones. Generally, 800 mesh and 1250 mesh can be selected for plastic, which can make the performance/price ratio the highest. 3. The price of talc powder fluctuates. Generally speaking, it is not a big problem to determine the price according to the number of items. For example, the price of 800 items is between 700 and 850 yuan, and that of 1250 items is between 1000 and 1280 yuan. It is abnormal for the price to be too high or too low. About the different use of talc powder and calcium carbonate: 1. The shape of talc powder is flaky, so it has higher rigidity, dimensional stabili

• How to prevent PVC soles from discoloring and yellowing in summer 2023-02-08

  PVC is widely used in shoe materials because of its high performance-price ratio. However, white soles often change color and turn yellow, especially in high temperature weather in summer. In order to prevent the soles from changing color and turning yellow, we should first identify the reasons for the color and turn yellow, and then apply the right medicine to the case. First, precipitation. Because there are a lot of plasticizers (generally 60~100PHR) added to the shoe material, but the compatibility of liquid plasticizers (especially chlorinated paraffin, liquid paraffin, white oil, etc.) with PVC is not very good. When the temperature rises, it is easy to precipitate to the surface of the shoe material, resulting in yellowing of the sole. Solution: use plasticizers with high molecular weight and good compatibility with PVC, such as polyester plasticizers; Use high mesh calcium powder to increase dispersion and oil absorption value; Reduce the use of stearic acid soap and stearic acid lubricant, and replace with polyol ester lubricant; Use some type 2 and 3 resin powder to increase oil absorption value; Add ACR resin to improve the uniformity of plasticization, make the surface compact and reduce the exudation. Second, lead pollution. When the temperature is high in summer, lead salt stabilizers, especially powdered trisalt and bisalt, are used. When the temperature is high, lead pollution or sulfur pollution, yellowing and discoloration will occur when sulfur elements (such as packaging cartons) are encountered. Solution: use lead salt stabilizer for PVC shoes or calcium and zinc stabilizer for soles; Reduce exposure to sulfur; Reduce storage temperature, etc. Third, the stability is insufficient. Insufficient stability of PVC will lead to the process from white to yellow to red to brown, and then the conversation will turn black. Stability is divided into light stability, thermal

• CPE, Do you really understand? 2023-02-07

  CPE is chlorinated polyethylene, which is prepared by chlorination of special high-density polyethylene (HDPE). It is the product of partially replacing the hydrogen atom on the molecular chain of HDPE with chlorine atom. It is white powder after drying and non-toxic. CPE molecular formula: CH2-CHCl-CH2-CH2] n English abbreviation: CPE or CM chlorinated polyethylene (CPE) is a saturated polymer material. characteristic Because CPE molecule does not contain double chain, it has good weather resistance, flame resistance and thermal stability, which is superior to PVC, low cost and excellent performance. Soluble in aromatics and halogenated hydrocarbons, insoluble in aliphatic hydrocarbons, decomposed above 170 ℃, and released hydrogen chloride gas. It has stable chemical structure, excellent aging resistance, flame resistance, cold resistance, weather resistance, free coloration, chemical resistance, ozone resistance, electrical insulation, and good compatibility and processability. It can be mixed with PVC, PE, PS and rubber to improve its physical properties. Three factors affecting CPE performance First, the type of PE used ---- CPE obtained from high molecular weight polyethylene has high viscosity and tensile strength, but the adhesion between CPE and PVC resin is low. CPE obtained from low molecular weight polyethylene has low viscosity and tensile strength, and CPE obtained from high density polyethylene has good heat resistance. Second: the size of raw material particles ----- the size is too small to form jelly or agglomerate CPE, and the chlorine distribution is uneven when the particle size is too large, which is difficult to dissolve in organic solvents, and the particle size range is 0.1-200 μ M is the best. Third, the chlorination degree of CPE - when the chlorine content is below 25%, it has poor compatibility with PVC and cannot be used as a modifier; When the ch

• PVC foaming products - unbalance characterization between various additives 2023-01-13

  1. Stabilizer The most widely used stabilizers in PVC foaming products are lead salt stabilizer and calcium zinc stabilizer. With the increasingly stringent requirements of environmental protection and the higher performance-price ratio of calcium zinc stabilizer, the application of calcium zinc stabilizer has become more and more extensive. Insufficient stabilizer, yellowing of board surface, large brittleness of paste and products, reduced strength and low foaming rate; If there is too much stabilizer and the foaming agent decomposes in advance, the gas will overflow from the feeding hole and vacuum hole, and the cavity structure will crack or shrink; 2. External lubricant The most widely used external lubricants on foaming products generally include paraffin wax and PE wax, which are easy to precipitate, so PE wax is generally used. The external slip is insufficient, and the temperature in zone 4 and zone 5 of the extruder is not easy to control, and it is easy to overheat. The plate surface has blisters, blisters, yellowing, and rough surface; The friction shear heat increases, causing material decomposition, yellowing and paste on the plate surface; Excessive external sliding and poor plasticization lead to scaling in the inner cavity of the mold and precipitation on the surface of the product, which is prone to leucorrhea, uneven wall thickness and irregular movement of some symptoms on the surface; 3. Internal lubricant Common internal lubricants include stearic acid, 60, monoglyceride, 316, etc. Insufficient internal lubrication, poor dispersion of materials, uneven plasticization, difficult to control the thickness of the product, thin middle and both sides of the foam board, white band, adhesion to the mold cavity and local overheating may also occur; Too much internal l

• Why use lubricant in PVC products 2022-12-01

  As we all know, plastics will be driven by mechanical force and stirred by shear force during heating, melting and molding. Plastics and plastics, plastics and machinery will generate various frictions, which will generate heat. Excessive friction will generate friction heat, which will lead to scorching and bubble phenomena when the temperature of the plastic core cannot be derived. Therefore, it is generally necessary to add lubricant in the plastic processing process to reduce the attraction between polymer molecules, so as to improve its fluidity, and reduce the adhesion of product surfaces and the mutual adhesion of plastics. In addition to improving the fluidity, the lubricant can also play the role of melting accelerator, anti adhesion agent, anti-static agent, smoothing agent, etc. After understanding the significance of its existence, let's take a look at its classification and functions? Lubricants mainly include internal lubricant and external lubricant 1. Main functions of internal lubricant and external lubricant The main function of the internal lubricant is to weaken the interaction between the internal chain segments of the polymer, make the polymer molecules slide easily, and improve the fluidity of the polymer melt. This lubricant is compatible with the polymer molecules and can be evenly distributed around the polymer molecules, such as the common processing aid: stearic acid The main function of the external lubricant is to make the surface of the product shiny, easy to demould, and prevent adhesion on the surface of the product. They have poor compatibility with the resin, and cannot be evenly dispersed around the resin molecules, and cannot be dispersed inside. Generally, the amount of external lubricant should not be too much, which may cause frost or stickiness on the surface. E.g. polyethylene wax 2. Main functions of internal lubricant and external

• PVC RESIN FOR PVC cable compound 2022-11-08

  PVC cable compound is a kind of particle prepared by mixing, kneading and extruding PVC based resin, adding stabilizer, dioctyl phthalate, diisodecyl phthalate, dioctyl terephthalate, trioctyl trimellitate and other plasticizers, calcium carbonate and other inorganic fillers, additives and lubricants. PVC cable material has high withstand voltage and insulation resistance, but its dielectric constant and dielectric loss are large. Therefore, it is generally used as the insulation layer of low voltage and medium high voltage cables. PVC plastic is also widely used as the protective material of wires and cables due to its flame retardant, oil resistant, corona resistant, chemical resistant and good water resistance. Heat resistant, cold resistant, oil resistant, flame-retardant, super soft, non-toxic and environment-friendly flame retardant PVC cable compounds can be manufactured by adding special performance additives or modifiers to meet the needs of special wire and cable products. The quality of PVC cable material is determined by the brightness of the cable material, and the main influencing factors are as follows: Plasticizer: The straighter and longer the molecular chain, the brighter. For example, 1030 is brighter than TOTM, and DOA is brighter than DOP. Stabilizer: It also has an effect. Generally, those with fast gel formation are brighter. Process: of course, the high extrusion temperature is brighter than the low temperature, and the good mixing effect is brighter than the poor mixing effect of black powder (such as 50L, etc.): do not exceed 0.8PHR, otherwise, be careful to granulate, and it will not be bright. PVC polymerization degree: the lower, the brighter, S-60 is brighter than S-70. Calcium carbonate: the finer the particle size, the brighter the surface is. Light calcium is brighter than heavy calcium, ultra-fine light calcium is

• Calcium carbide weekly report in Novermber 2022-11-07

  This week (2022.10.31-2022.11.04), the mainstream ex factory price and receiving price of calcium carbide were mainly adjusted below, and the production enterprises had poor delivery. The price of calcium carbide generally fell at the weekend, and this week continued the trend of decline at the weekend to maintain a weak operation, with the price dropping frequently.First of all, some upstream manufacturers resumed operation of their devices, and the manufacturer's inventory pressure increased. Some manufacturers lowered their ex factory quotations to promote shipment and reduce inventory; Secondly, the downstream PVC in some areas has entered the maintenance stage. Some devices of BDO enterprise have been stopped for maintenance or agent replacement. The downstream demand has shown a decreasing trend as a whole, which has a certain price depressing behavior for calcium carbide enterprises. The main downstream PVC has different purchase prices for calcium carbide. The traders reduced the market price to facilitate the transaction. At present, from the perspective of calcium carbide market fundamentals, the market price may still have a downward trend. From the perspective of supply, the starting of calcium carbide manufacturers in some regions has increased to a certain extent, and the manufacturer's inventory has increased; From the perspective of demand, both downstream PVC and BDO enterprises' devices have been overhauled. At present, the downstream market is entering the slack season of demand, and the purchasing enthusiasm is not high. Although the downstream PVC market has reversed in the week, it has not played a significant role in supporting the calcium carbide market as far as the current situation is concerned. The PVC market trend may have a certain impact on the calcium carbide market in the later stage, so it is necessary to pay attention to the PVC market trend. The semicoke market on the raw material side stabilized after a short f

• Calcium carbide: the price continues to decrease, and the supply side gradually increases 2022-11-04

  Today, the mainstream factory price and acceptance price of the domestic calcium carbide market continue to decline, and the supply and demand sides of the calcium carbide market perform generally. The upstream production enterprises are relatively active in shipping, the inventory is at a higher level compared with the downstream demand, the downstream demand is relatively weak, and the market is in a situation where supply exceeds demand. The manufacturers are blocked in shipping, so the factory price is lowered, and the traders reduce the shipping price to promote the transaction. At present, the supply and demand side is weak, basically in a situation of weak supply and demand. The supply side of enterprises in some regions has improved, and some early maintenance devices are expected to recover. The supply side has an increasing trend, while the demand side is not performing well. The downstream PVC has turned from a decline to an increase after a long period of decline in the early stage. Although the market has reversed, from the current feedback of the calcium carbide market, there is no significant support for the calcium carbide market, In addition, the demand for some devices in BDO industry to be shut down for maintenance or agent change is expected to decrease. On the whole, the calcium carbide market is expected to continue to fluctuate and decline in the short term. We have done chemical products for over 30years. Our main products include PVC RESIN, CPE, TIO2,PE WAX, PARAFFIN WAX, STABILIZER ETC.

• Precautions in the production process of PVC foam board 2022-10-12

  The problems encountered during the extrusion of PVC foam sheets can be basically classified into four categories, First, stability Second, the melt strength Third, lubrication Fourth, decentralization These four types of problems, especially the first three types of problems, will restrict each other and cross affect each other. Sometimes it is difficult to distinguish them immediately from the superficial phenomenon. It is necessary to observe and analyze the problem and find the root cause to fundamentally solve it. Inadequate stability will affect the whole board surface. The board surface will turn yellow and the foam sheet will be brittle. Insufficient melt strength will lead to large foam cell and long longitudinal foam. To judge whether the melt strength is insufficient, the direct method is to press the sheet wrapped on the middle roll with your finger behind the three rolls. When the melt strength is good, you can feel the elasticity. If it is difficult to spring up after pressing, the melt strength is poor. It is difficult to judge whether the temperature is reasonable because the screw structure and cooling mode are quite different. Generally speaking, the temperature in Zone 3-5 should be lower within the allowable load of the extruder. In order to obtain uniform foamed products in foamed pipes, it is also necessary to ensure that PVC materials have good melt strength. The foaming agent developed by the company is developed to solve this problem of foaming products, which can effectively improve the quality of foaming pipes. Lubricants are divided into external lubricant and internal lubricant. The external sliding is beneficial to demoulding and the smoothness of the plate surface. The external sliding is too little, and the temperature in zone 5 of the extruder is difficult to control and easy t

• CPE or CM chlorinated polyethylene 2022-10-11

  CPE, namely chlorinated polyethylene, is prepared by chlorination of special high-density polyethylene (HDPE). It is the product of partially replacing hydrogen atoms on HDPE molecular chain with chlorine atoms. After drying, it is white powder, non-toxic. CPE molecular formula: CH2-CHCl-CH2-CH2] n English abbreviation: CPE or CM chlorinated polyethylene (CPE) is a saturated polymer material. characteristic Because CPE molecule does not contain double chains, it has good weather resistance, flame resistance and thermal stability, superior to PVC, low cost and excellent performance. It is soluble in aromatic hydrocarbons and halogenated hydrocarbons, insoluble in aliphatic hydrocarbons, decomposes above 170 ℃ and emits hydrogen chloride gas. It has stable chemical structure, excellent aging resistance, flame resistance, cold resistance, weather resistance, free coloring, chemical resistance, ozone resistance, electrical insulation, and good compatibility and processability. It can be mixed with PVC, PE, PS, and rubber to improve their physical properties. Three factors affecting CPE performance First, the type of PE used ---- CPE obtained from high molecular weight polyethylene has high viscosity and tensile strength, but the adhesion between CPE and PVC resin is low. CPE obtained from low molecular weight polyethylene has low viscosity and tensile strength. CPE obtained from high density polyethylene has good heat resistance. Second: size of raw material particles ---- gel or agglomerated CPE is easy to form when the particle size is too small, chlorine distribution is uneven when the particle size is too large, and it is difficult to dissolve in organic solvents, and the particle size range is 0.1-200 μ M is the best. Third: The chlorination degree of CPE ---- When the chlorine content is below 25%, the compatibility with PVC is poor, and it cannot be

• Methods for improving the hardness of pvc pipes 2022-10-10

  The hardness of the PVC pipe can not reach the standard, how to improve it? Mainly from the aspects of raw materials and formula. See the following for details: 1. The sedimentation volume of filler (calcium powder) should preferably be within 2.6-3.0. Both hardness and tear strength shall be considered, and calcium powder shall not exceed 25 phr as far as possible. In addition, appropriate nano calcium can be added to improve the strength; 2. The selection of stabilizer is very important. Stabilizers (lead salt stabilizers, calcium zinc stabilizers, etc.) should have good thermal stability and stable internal and external lubrication balance. Do not use cheap stabilizer, poor 3. If the stability is not enough, a small amount of metal soap can be compensated; 4. The amount of CPE shall not be too large, and excessive amount of CPE will affect the hardness of the pipe; CPE shall be selected with high molecular weight, standard chlorine content, no more than 35%, and no residue; 5. Lubricants shall not be used too badly, but must be good. PE wax is the worst for external sliding. The total dosage is about 1.5 phr, not too much, so when the product is deformed when encountering external forces, the PVC molecular chain connection is not easy to be damaged; 6. In terms of modification, CPE+ACR system, ACR+MABS system or CPE+MABS system can be selected. 7. Titanium dioxide will affect the tear strength, so it should be fine.