Lubricant

The reason why the lubricant can play a lubricating role is that the addition of lubricant can reduce the friction of Ya plastic melt, which can be divided into internal friction and external friction. Therefore, there are internal and external lubricants.

1. The main function of external lubricant is to improve the friction between the polymer melt and the hot metal surface of the equipment, so that the plastic parts are easy to demould. It has poor compatibility with the polymer, and it is easy to migrate from the melt to the outside. During the molding process, it can form a very thin separation film between the melt and the mold, so that the plastic does not stick to the mold surface.

2. The internal lubricant has good compatibility with the polymer. It can reduce the cohesion between the polymer molecules in the polymer, so as to improve the internal friction heat generation of the plastic melt and the fluidity of the melt. The combination between internal lubricant and polymer long chain molecules is not strong, they may have the similar effect to rolling bearing, so they can arrange themselves in the direction of melt flow, thus sliding each other and reducing internal friction, which is the mechanism of internal lubrication.