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How to use calcium stearate in plastics processing?
Release Time:
2023-03-09
Calcium stearate is used as heat stabilizer for PVC and lubricant and release agent for various plastic processing. When used as a PVC lubricant, it is generally considered an internal lubricant.
The wholesale price of calcium stearate tells you how to use calcium stearate in plastic processing:
Calcium stearate is used as heat stabilizer for PVC and 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 highly polar calcium stearate, and the chemical active points of PVC resin particles can form a stable complex system with calcium stearate. However, the two long-chain alkyl groups of calcium stearate have almost no compatibility with polar resins such as PVC, and form a local two-phase interface inside the PVC resin, that is, a lubricating film. The microcosmic essence of lubrication is that the force between the local lubricating interface formed by the non-jittery long-chain alkyl group and the jerky resin segment is smaller than the force between the jerky resin segments, and because there are many small holes between the resin segments , so when the resin segment is replaced, the freely deformable alkyl group will be squeezed into other pores near the resin segment. This reduces the displacement resistance of the resin segment and provides internal lubrication.
In practical applications, calcium stearate as a PVC lubricant not only plays the role of internal lubrication, but its lubrication is more complicated. In other cases where the proportion of internal lubrication is high, it will show the effect of external lubrication. Synergistic with various lubricating oils.
In hard products, use base lead salts, lead soaps to increase gelation speed. It is also used in non-toxic soft films and appliances such as food packaging and medical equipment. It is available as PE and PP to eliminate the adverse effect of residual catalyst on color and stability. Plasticizers in rubber processing can soften natural rubber and synthetic rubber and have little effect on vulcanization.
Calcium stearate can be used alone in the formula, which can accelerate plasticization, increase melt viscosity, increase torque, and have a certain influence on the demoulding effect in China. However, the use of paraffin wax alone shows different delays in plasticization and reduces Torque, no release action.
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