Liaoning Xinda Talc Group - Deng Xianghui

Calcium stearate is a common metal soap additive produced by the reaction of stearic acid with calcium hydroxide or calcium chloride. It is widely used in industries such as plastics, rubber, coatings, cosmetics, and food.

Calcium stearate in modified plastics is mainly reflected in the following aspects:

1. Lubricants (external lubrication/internal lubrication)

Calcium stearate has good internal and external lubrication properties, which can effectively reduce the friction between polymer melt and processing equipment; Reduce adhesion, improve fluidity, and make materials easier to demold; Especially suitable for processing thermoplastic materials such as PVC, PP, PE, ABS, etc.

2. Heat stabilizer (especially suitable for PVC)

Calcium stearate can be used as an auxiliary thermal stabilizer in PVC and other easily biodegradable materials; Can effectively neutralize the hydrogen chloride (HCl) released during the processing, preventing further degradation of the resin; Extend the thermal stability time of the material and improve its heat-resistant processing performance.

3. Coupling treatment agent for fillers

Calcium stearate can be used as a surface treatment agent for modified plastics with inorganic fillers such as calcium carbonate, talc powder, aluminum hydroxide, etc;

Improve the compatibility between the filler and the matrix resin, and enhance the mechanical properties;

Helps to achieve higher filling levels without significantly affecting material properties.

4. Improve surface smoothness and demolding performance

Calcium stearate can enhance the surface glossiness of finished products in injection molding, extrusion and other molding processes; Reduce the adhesion between the mold and the product, facilitate demolding, and reduce the scrap rate.

Practical application examples