Calcium stearate other calcium octadecanoate salt, white fine powder, insoluble in water, slightly soluble in hot ethanol, soluble in organic solvents such as hot benzene and turpentine. Flammable, decomposed into stearic acid and corresponding calcium salt in case of strong acid, easy to absorb moisture in the air. Different from zinc stearate, the application of calcium stearate in PVC industry mainly lies in smooth plasticization. It is found that calcium stearate has a special effect in practical application. The main role of calcium stearate in PVC production is to promote plasticization, but there is a special use but few people understand.
As we all know, after the new equipment or just replace the new screw, there will often be a little problem in the production, mainly in the plasticization imbalance. It is found that when the new screw is just used in the first two or three months, adding about 0.2 kg of calcium stearate to the raw material formula can change the problems in its production, but also promote smooth plasticizing, but also play a role in protecting the screw, reducing wear and prolong the service life of the screw. Calcium stearate is a very widely used additive, PVC stabilizer, which plays a great role as an additive, has been used in many industries and fields. But calcium stearate manufacturers need to remind you that the use of calcium stearate in different fields, dosage, characteristics and so on are different, so what should be paid attention to when using calcium stearate?
Precautions for calcium stearate use:
1, in the calcium-zinc composite heat stabilizer system, the proportion of calcium stearate is too low, will lead to the initial heat stability efficiency is not good, the proportion is too high, will make PVC products yellow, poor weather resistance;
2, calcium stearate will affect the decomposition temperature of the foaming agent, so the use of appropriate increase in the amount of stabilizer;
3, manufacturing PVC transparent products, calcium stearate should not be greater than 0.5 parts, otherwise it will affect the transparency of PVC materials;
4, calcium stearate in the lead salt compound stabilizer added, add too much will appear over plasticization Angle, affect the lubrication system, will lead to mechanical product strength decline;