Preparation method of magnesium stearate with improved specific volume and whiteness

Abstract

The invention relates to a preparation method of magnesium stearate with improved specific volume and whiteness. According to the invention, a mass ratio of stearic acid to lye to magnesium sulfate to sand-filtered water is 1.8-2.2:0.7-0.9:1:7.6-8.4. The concentration of lye is 40%. The invention provides a preparation method of magnesium stearate with the components. The method provided by the invention is advantaged in that: (1) according to the novel technology, during an alkalization process, 40% of lye is used for replacing 42% of lye; the replacement is beneficial for purification in a filtration process, and for removing impurities. Under the controlling of optimal temperature, time, and rotary rate, saponification and double decomposition reactions are fully carried out, a reaction period is shortened, efficiency and quality indexes are improved, and property advantages of magnesium stearate such as specific volume and whiteness are improved; (2) according to the novel technology, a plurality of washing processes are eliminated; a one-step method is adopted in the drying process, such that the drying processes are reduced. Therefore, purposes of energy saving, energy consumption reducing, and water consumption reducing are achieved; large-area reformation upon equipments is not required; production efficiency can be substantially improved; and product indexes can reach a national first-grade standard. Compared to prior arts, the technology is substantially advanced.

Description

technical field [0001] The present invention relates to a kind of acyclic and carbocyclic compound, more specifically relate to a kind of preparation method of magnesium stearate improving its specific volume and whiteness. Background technique [0002] In the prior art, magnesium stearate is mainly used as a non-toxic heat stabilizer and lubricant for polyethylene, and the traditional preparation process is roughly as follows: raw material dissolution, saponification, metathesis, washing, drying, sieving, packaging. [0003] The specific process is: [0004] Raw material dissolution: put 95% of the solid caustic soda into the alkali reaction kettle for dissolution, let it stand when the concentration is 42%, take the supernatant and filter, and the filtrate is set aside. Dissolve magnesium sulfate in sand-filtered water, then slowly add ammonium persulfate solution under stirring, stir for 15 minutes, then adjust the pH with a small amount of lye, let stand, filter, and th...

AI Technical Summary

Problems solved by technology

[0012] The defective that its prior art exists: because sodium soap gelatinization energy is big, and solubility is little, and solution is viscous, and stearic acid is easy to combine and generate acidic soap, is also easily salted out and makes reactivity decline, and its technology has container equipment big, Disadvantages such as low production efficiency, high energy consumption and water consumption

With the official implementation of the 2010 edition of the "Chinese Pharmacopoeia", the quality requirements of preparation products are getting higher and higher, and the specific volume and whiteness of magnesium stearate produced by traditional processes can no longer meet the requirements of preparation products.

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