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How is calcium stearate synthesized?
Release Time:
2023-03-09
With the development and progress of science and technology, our application of chemical substances has also improved a lot. Calcium stearate is an organic compound with a molecular formula of C36H70CaO4, a white powder, insoluble in water, and can be used as a waterproofing agent, lubricant and plastic Auxiliary, etc.
With the development and progress of science and technology, our application of chemical substances has also improved a lot. Calcium stearate is an organic compound with a molecular formula of C36H70CaO4, a white powder, insoluble in water, and can be used as a waterproofing agent, lubricant and plastic Auxiliary, etc. Calcium stearate can be used as a heat stabilizer for polyvinyl chloride, a lubricant for various plastic processing, and a mold release agent. In hard products, it can increase the gelation speed when combined with basic lead salts and lead soaps. Also used in food packaging, medical appliances and other non-toxic soft films and appliances. The following Shandong calcium stearate manufacturers will introduce the synthesis method of calcium stearate.
1. Double decomposition method: Dissolve stearic acid in hot water with 20 times the mass, join in a rich caustic soda solution, and carry out saponification reaction at about 75°C to generate dilute sodium stearate solution. Then the calcium chloride solution with a content of 1074kg/m3 is added to the sodium stearate solution, and the metathesis reaction is carried out at about 65°C, and the product calcium stearate is separated out by accumulation. Then filter, wash with water, and dry at about 90°C to get the finished product.
Two, the composition of calcium stearate is that the calcium chloride solution that content is 1074kg/m3 (10 ° of Bé) participates in the sodium stearate solution of above-mentioned preparation, carries out metathesis reaction at about 65 ℃, and product calcium stearate is with Stacked out. Then filter, wash with water, and dry at about 90°C to get the finished product.
3. Preparation of sodium stearate solution Dissolve stearic acid in 20 times (mass) hot water, participate in caustic soda solution with a content of 1074kg/m3 (10°Bé), and carry out saponification reaction at about 75°C to generate dilute Sodium stearate solution.
4. Suspend 5.60g (0.1mol) of calcium oxide in 300mL of hot water at 55°C. Then dissolve 51.3g of chemically pure stearic acid in 350mL of hot water at 70°C, add 0.75g of diethanolamine, and stir to emulsify it. Gradually add the prepared stearic acid emulsion into the calcium oxide suspension within 2 hours, and stir thoroughly, filter out the formed white insoluble matter, namely calcium stearate, and dry to obtain the calcium stearate product.
5. Direct method: add a certain amount of stearic acid and CaO in a reaction pot equipped with a stirrer and a thermometer, heat up to melt, slowly add catalyst H2O2 under constant stirring, and vacuumize, and control the reaction temperature at 140-150°C , Reaction 1.5 ~ 2.0h. After the reaction is completed, the material is discharged, cooled and destroyed to obtain the product.
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