[Shanghai calcium stearate supplier] Advantages and disadvantages of calcium stearate in general plastics

Calcium stearate is a white light crystalline powder. The melting point is 179~180℃, and it will decompose under high heat. Insoluble in water, cold ethanol and ether, soluble in hot benzene, toluene and turpentine, slightly soluble in hot ethanol and ether. Used as lubricant, sliding agent, heat stabilizer, release agent, accelerator, etc. in plastics, machinery, rubber, paint and ink and other industries.

The following suppliers of calcium stearate will introduce to you the advantages and disadvantages of calcium stearate in general plastics:

Advantages of calcium stearate in general plastics:

Calcium stearate can be used as a heat stabilizer for polyvinyl chloride and has excellent lubricity. Although the thermal stability performance is average, it is not as good as barium stearate, lead stearate, tin stearate and cadmium stearate. But it is cheap and easy to obtain, has low toxicity and good processability. It has a synergistic effect when used together with zinc soap and epoxy compounds to improve thermal stability. It is often used in soft products that require non-toxicity, such as food packaging films and medical devices.

Used together with basic lead salts and lead soaps in hard products to increase the gelation speed.

Calcium stearate is used in polyethylene and polypropylene to eliminate the negative effects of residual catalyst on the color and stability of the resin. It is also widely used as a lubricant and release agent for thermosetting plastics such as polyolefins, polyester reinforced plastics, phenolic resins, and amino resins.

Disadvantages of calcium stearate used in general plastics:

The disadvantage of calcium stearate is that it has initial coloration. When it is heated above 100℃ for a long time, it will turn white polyvinyl chloride. The plastic turns reddish, especially when titanium dioxide is present in the formula. At this time, if you add 0.06~0.12%Na2CO3 or 0.09~0.19NaHCO3, this shortcoming can be overcome. However, because these substances are too alkaline, they are not often used in practice.