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Comparison of dry and wet production methods of calcium stearate
Calcium stearate is widely used, which is determined by its properties. It can be used as a lubricant, a mold release agent, etc., which is also inseparable from its production methods, mainly water and melt methods. The water produced by the water method is acidic, and the molten method is alkaline. The specific production is as follows:
1. The water method is also called the wet method.
When water is used as a medium, a certain amount of catalyst is added, the appropriate temperature and pressure are controlled, and then a certain amount of metal hydroxide is added, and the metal ions are replaced by a catalyst onto the catalyst, and then replaced by a catalyst to a hard On the fatty acid, a metal salt is formed, and the catalyst is subjected to post-treatment, recycling, and the stearate is subjected to centrifugation, drying, and grinding to obtain an industrial standard product having a mesh number of 200-600 mesh. The water method generally produces stearic acid. There will be a slight excess, so the finished calcium stearate is acidic after the reaction.
2, the melting method is also called dry method
It means that in the molten stearic acid, metal oxide (indirect zinc oxide) is directly added (of course, in the presence of a catalyst, the conversion rate of the reaction may be long and long), and a certain temperature and pressure are controlled. At the speed, the stearate is obtained by the reaction, and the product produced by the dry process can be completely reacted due to the existence of the catalyst. The metal oxide is slightly excessive, so that the product is alkaline when tested.
Through introduction, we know why the two methods of production of calcium stearate are different in acidity and alkalinity, and have a general understanding of its production process. It is necessary to pay attention to some details in the production process, such as temperature, pressure, etc. These will affect the nature of the final product.