Zinc stearate is a white powder, insoluble in water, soluble in heat It contains organic solvents such as ethanol, benzene, toluene, and turpentine; it decomposes into stearic acid and corresponding salts when exposed to acids; it is a fire hazard under dry conditions, with an auto-ignition point of 900°C; it is hygroscopic. Zinc stearate is commonly used as heat stabilizer, lubricant and release agent in industrial production.
According to the supply of zinc stearate, zinc stearate can be used as the following additives in industry:
1. Stearic acid Zinc can be used as a non-toxic PVC heat stabilizer with little initial coloration and good weather resistance. This product is not easy to use alone because it has a significant catalytic effect on the degradation of polyvinyl chloride and can cause the product to change color rapidly after a period of time. Used in combination with barium cadmium soap for general soft products. The dosage of this product should not be too large, but when used in conjunction with epoxy compounds and phosphites, the dosage can be appropriately increased.
2. Zinc stearate is an acidic filler active agent. It is only active on acidic fillers. It can also be used as a lubricant and the price is relatively low. When it is used as an internal release agent The performance has always been stable.
3. Zinc stearate is generally used as a melting agent in rubber and is rarely used as an active agent because its solubility with rubber is very small and easy to spray onto the surface, but it is often used in EVA, etc. Peroxide foaming products are used as assistant foaming agents and active agents.
4. The relative density of zinc stearate is 1.05-1.10. It is mainly used as an activator and dusting powder. It can also be used as a release lubricant, plasticizer and softener. It is suitable for natural rubber, synthetic rubber and latex. . When zinc stearate is used as an activator, it can act as an acidic activation agent and improve processing performance. It can be sprinkled as dusting powder on the surface of the product or in the mold cavity, or made into a water dispersion and applied to the surface of the product or model to prevent film adhesion. .
5. Zinc stearate is generally used as a release agent. When mixing neoprene and chlorosulfonated polyethylene rubber, it is a good lubricant and can significantly reduce the occurrence of roller sticking. The general dosage is 1-2%, which is safe. Excessive dosage will cause it to spray out easily. In addition, it has the effect of reducing the surface gloss of rubber products, that is, it has a certain matting effect. It also has a function. Adding 1-2% during mixing can significantly improve the fluidity of the rubber. It is an internal rubber fluidity improver, which can significantly reduce the occurrence of material shortages and defective products in the production of film pressed products. �
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