Magnesium stearate is a white loose fine powder with a smooth feel. It is insoluble in water, ethanol and ether, but soluble in hot water and ether. It decomposes into stearin when exposed to acid. Acids and corresponding magnesium salts. The solubility in room temperature water is 77-79 mg/L, and it is soluble in hot ethanol. It has a slight odor and a greasy feel.
The application and role of magnesium stearate in plastics and rubber:
Magnesium stearate is an excellent lubrication, dispersion and stabilizing additive for plastic rubber, a release agent for plastic products, and a transparent or translucent rubber product.
Magnesium stearate can react with the hydrochloric acid produced by thermal decomposition of PVC to prevent decomposition.
At the same time, magnesium stearate is also a good light stabilizer, which can inhibit the aging effect of ultraviolet rays on the film and extend the service life of agricultural films.
Scientific researchers also found that stearic acid has a flame retardant effect in plastic rubber, and magnesium stearate compound can improve the flame resistance of ABS.
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