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 lubricant
The function of internal lubricant is mainly to weaken the attraction between macromolecular chains, make them slide easily, and reduce the interface friction; The powder resin is stably gel; Reduce the melt viscosity of the resin and improve the fluidity of the resin; Improve production capacity and reduce mechanical load.
The main function of the external lubricant is to reduce the aging and decomposition of the resin due to local overheating; Improve the surface gloss of plastic products; Make the products easy to demould and prevent the products from adhering to the mold surface.
We have done chemical products for over 30years. Our main products include PVC Resin, CPE, TIO2, Paraffin Wax, PE WAX, Stabilizer ETC.
