According to the supply of calcium stearate: calcium stearate is white in color Powder, insoluble in water, cold ethanol and ether, soluble in hot benzene, benzene and turpentine and other organic solvents, slightly soluble in hot ethanol and ether. It decomposes slowly when heated to 400°C and is flammable. It decomposes into stearic acid and corresponding calcium salts when exposed to strong acid and is hygroscopic.
Calcium stearate was originally used as an auxiliary stabilizer:
Calcium stearate was initially used as an auxiliary stabilizer in PVC. Its main function is to absorb chloride ions produced by the degradation of PVC. At the same time, you should also find that calcium stearate is also very commonly used in polyolefin formulas. You may know the purpose of using calcium stearate in the original design of polyolefin formulas. There are not many people. In fact, calcium stearate was originally used in polyolefin formulas to absorb some halogen components added during polyolefin polymerization, so it is called halogen absorbent.
Then why is calcium stearate also called a lubricant?
As we all know, many types of additives need to be added in formula design. Even if lubricants are not specifically added to polyolefins, the dispersant added is also a lubricant, which is equivalent to a disguised form. Lubricant added. In practice, it was found that when calcium stearate is present in the blend system, the lubrication performance will change significantly. Therefore, calcium stearate is a lubricant and has become the research object of experts and scholars, and has achieved fruitful results. .
In fact, calcium stearate will act as a “rivet” in the presence of other lubricants, strengthening the adhesion effect of other lubricants, thus enhancing the lubrication effect. That is to say, Calcium stearate has a synergistic effect. If you don’t believe it, except for calcium stearate, no other lubricating additives are added to the formula system. Go check out the lubrication of calcium stearate. How much effect does it have? Of course, except for the high solid calcium stearate specially compounded for lubrication. When calcium stearate and polyethylene wax are used together, better results can be achieved, the lubrication effect is enhanced, and the dispersion of the lubricant is optimized.
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