Lubricants for PVC product processing

1. The heat stabilizers, lubricants, anti-impact agents, processing aids, pigments and other additives commonly used in PVC are formulated according to product performance requirements, and the formula cost is reduced as much as possible on the premise of ensuring product quality and processing technology requirements . Lubricant is one of the most important factors affecting the processing of PVC resin hard products. It mainly improves the fluidity of PVC resin processing and the release property of products, and prevents product defects due to adhesion in the machine or in the mold.
2. Since PVC resin has a polar molecular structure, the force between molecular chains is large, and it is easy to decompose under the action of heat, light, oxygen and high shear force during processing. Therefore, lubricants and internal lubrication are required during the processing of PVC resin. The agent weakens the intermolecular force of PVC, reduces the generation of internal friction heat, and makes it easy to plasticize. Adding an external lubricant reduces the friction and adhesion between PVC and steel, regulates the plasticizing rate, improves the fluidity of PVC processing, and makes it easy to melt and form. In general, internal lubricants promote plasticization and external lubricants delay plasticization. The degree of plasticization of PVC-U is about 65%, and its mechanical properties are the best. Therefore, reasonable consideration should be given to the fluidity, anti-adhesion and plasticization rate of PVC resin, that is, to balance the internal and external lubrication to achieve the purpose of economical and continuous production.

Lubrication Equilibrium Mechanism of Fischer-Tropsch Synthetic Wax

1. The main feature of the external lubricant is interface lubrication. During the processing, the external lubricant is easy to migrate to the surface of the product or the interface between the melt and the processing machine, and the molecular orientation is arranged to form a lubricant molecular layer through physical adsorption. The internal lubricant can be dissolved into the molecular chain of the polymer to reduce the internal friction, reduce the melt viscosity, increase the melting rate of the plastic, and improve the plasticizing performance.
2. Fischer-Tropsch synthetic wax is mainly used as an external lubricant in PVC processing and production. Since Fischer-Tropsch synthetic wax has small molecular weight, low melt viscosity, high melting point, and narrow melting range, the same lubricating effect can be achieved with less dosage, reducing In order to eliminate the negative impact of lubricants on the physical and mechanical properties of products, the adjustment of internal and external lubrication balance has the irreplaceable advantage of PE wax.