company news about Is calcium stearate a stabilizer or a lubricant?

Calcium stearate, originally used in PVC is used as an auxiliary stabilizer, the main role is used to absorb chloride ions produced by PVC degradation; At the same time, we should also find that the application of calcium stearate is very common in the formula of polyolefin. Probably not many people know the purpose of using calcium stearate in the original design of the formula of polyolefin. In fact, calcium stearate was used in the formula of polyolefin to absorb some halogen components added in the polymerization of polyolefin, so there is a name of halogen absorbent. So why is it called a lubricant?

As we all know, many kinds of additives should be added in the formula design. Even if the polyolefin is not specially added with lubricant, the dispersant added is also a lubricant, which is equal to adding a lubricant in a disguised phase. In practice, it is found that when there is calcium stearate in the blending system, the lubrication performance will change significantly. Therefore, calcium stearate is a kind of lubricant and has become the research object, and calcium stearate in the presence of other lubricants, will play a "rivet" role, strengthen the adhesion effect of other lubricants, thus enhancing the lubrication effect.

That is to say, calcium stearate is to play a synergistic effect, in addition to calcium stearate in the formula system, other additives that can play the role of lubrication are not added, you go to see how much calcium stearate lubrication? Except, of course, high solid calcium stearate, which is specially mixed for lubrication. In other words, it is not meaningful to talk about the lubricating effect of calcium stearate alone, apart from other lubricating additives. Again, why is calcium stearate instead of barium stearate, zinc stearate and others? Because the stearate family is large enough, the reason is actually very simple, calcium stearate in this family has little influence on the mechanical properties of the matrix, that is to say, it is the crystallization of generations of skilled people to make calcium stearate.