How to use calcium stearate in plastic processing?
2023-09-13
Calcium stearate serves as a heat stabilizer for PVC and a lubricant and release agent for various plastic processing. When used as a PVC lubricant, it is generally considered an internal lubricant. Calcium stearate is a stearate of medium to strong alkaline calcium with strong polarity. The chemical active points of PVC resin particles can form a relatively stable complex system with calcium stearate. The two long chain alkyl groups of calcium stearate have less compatibility with polar resins such as PVC, forming a local microscopic two-phase interface within the PVC resin, known as a lubricating film.