Lubrication Application of calcium stearate The use of calcium stearate in the production, processing and modification of polymers. Calcium stearate is used as a heat stabilizer and lubricant for PVC. Calcium stearate is used as beta - crystalline nucleating agent and halogen absorber for polypropylene. Calcium stearate is not only the stabilizer and vulcanization rate inhibitor of halogenated butyl rubber products, but also the dispersant and lubricant in the production process of halogenated butyl rubber. Calcium stearate is a metal soap surfactant. Because the preparation method is simple and cheap, calcium stearate is widely used in flat paint and paper coating additives. Calcium stearate is also used to lubricate pencil leads and waterproof buildings.
Calcium stearate is a release agent commonly used in the field of polymer material processing. In fact, in addition to use as a release agent, because of its environmental protection, weak alkaline substances and other properties, so calcium stearate in the field of polymer materials has a very wide range of uses. Polyvinyl chloride (PVC) in the process of processing, PVC is easy to break chains and cross linking due to dechlorination, so that the color of the material is deepened, the performance is worse. The effect of calcium stearate on the properties of PVC materials can be studied by various means, such as yellow index and refractive instrument to study the color change, Fourier transform infrared analyzer (FTIR) to study the formation of carbonyl group, and relative molecular mass and gel content to study the crosslinking and degradation of materials.
It was found that although temperature had no effect on the amount of dechlorination, the dechlorination rate was greatly affected by temperature. Chain crosslinking plays a leading role in the degradation of materials. The effect of calcium stearate on the pyrolysis performance of PVC was studied. The results showed that calcium stearate significantly delayed the thermal release of chlorine in PVC and reduced the dechlorination rate, which indicated that the presence of calcium stearate had an inhibitory effect on the dechlorination of PVC. The reason why calcium stearate can inhibit the dechlorination of PVC is that calcium stearate can absorb free radicals formed in the pyrolysis process, and calcium stearate can react with HCl produced in the dechlorination process to reduce the dechlorination rate.