The role of zinc stearate in rubber
With the development of my country's rubber industry, rubber products have been integrated into all aspects of our lives. From engineering rubber to door and window sealing strips, rubber is inseparable. The rubber product industry is developing rapidly; The diversification of styles and the competition of online and offline products have had a great impact on the operation of rubber product companies. Not only that, but rubber product companies are also facing problems with formula and production technology, which can be said to be difficult.
Below, Hongyuan Xiaobian will explain to you the role of zinc stearate in different rubber products. 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 it is easy to spray on the surface, but many of them are used as foaming agent in peroxide foaming products such as EVA Use, that is, an active agent.
The relative density of zinc stearate is 1.05-1.10, and it is mainly used as active agent and dust removal powder. It can also be used as a release lubricant, plasticizer and softener for natural rubber, synthetic rubber and latex. When zinc stearate is used as an active agent, it can play an acid activation role and improve processing performance. It can be sprayed on the surface or cavity of the product in powder form, or made into an aqueous dispersion and coated on the surface or cavity of the product to prevent film sticking
Zinc stearate is commonly used as a mold release agent. When mixed with chloroprene rubber and chlorosulfonated polyethylene rubber, it is a good lubricant, which can significantly reduce the sticking phenomenon. Generally, the dosage of 1-2% is safe, and the excessive amount is easy to spray out. In addition, it can also reduce the surface gloss of rubber products, that is, it has a certain matting effect. It also has another function. Adding 1-2% during mixing can significantly enhance the fluidity of the compound, that is, the internal rubber fluidity improver, which can significantly reduce defective products due to lack of material in the production of film pressed products.
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