Preparation method of glyzinc

Abstract

The invention relates to a preparation method of glyzinc, and belongs to the field of chemical synthesis. The preparation method comprises the following steps of adding a zinc source, a catalyst and an aprotic solvent into a reactor according to a mass ratio being 1:(0.05 to 0.15): (2 to 10); performing stirring for 5 to 30min; then, adding dispersing agents accounting for 0.3 to 3 percent of the mass of the zinc source; performing stirring for 5 to 10 min so that the zinc source and the catalyst are uniformly dispersed in a solvent; then, adding glycerol (the mol ratio of the glycerol to the zinc source is (1 to 1.2):1); raising the temperature to 100 to 150 DEG C under the stirring condition; taking a reaction for 2 to 4 hours; performing cooling and suction filtration; performing washing by C<1 to 3> monohydric alcohol, and then performing suction filtration and drying to obtain the glyzinc. The invention provides the preparation method with the advantages that the process is simple; the operation is convenient; the reaction conditions are mild; the temperature can be easily controlled. The glyzinc synthesis is performed in the aprotic solvents; through the addition of dispersing agents, reaction substances cannot agglomerate or deposit on the device wall; after the reaction, the filtering and the separation can be directly performed; the washing is easy.

Description

technical field [0001] The invention relates to a preparation method of zinc glycerol, which belongs to the field of chemical synthesis. Background technique [0002] Glycerol zinc (Zinc glycerolate, Glyzinc), also known as glycerol zinc complexes (Zinc glycerolate complexes), molecular formula (C 3 h 6 o 3 Zn) x , is a wide range of fine chemicals, with good barrier, anti-ultraviolet properties, non-toxic, non-coloring, can be used as plastic light stabilizer, heat stabilizer and rubber vulcanization activator. Zinc glycerol is often used as an important component of cosmetics, which plays the role of lubrication, anti-ultraviolet radiation, etc., and is also often used as a zinc supplement and a drug for treating skin diseases. At present, the preparation methods of zinc glycerol all adopt the direct reaction of zinc source and glycerin, and the amount of glycerol is generally 3-10 times of the mass of zinc source. According to the different zinc sources, the reaction...

AI Technical Summary

Problems solved by technology

According to the different zinc sources, the reaction difficulty and reaction conditions are different: if zinc acetate is used as the zinc source, the reaction with glycerol is easier to proceed without a catalyst, and it can be directly reacted at 110~160°C to form glycerol zinc, but due to The cost of zinc acetate is relatively expensive, and the reaction produces strongly irritating and corrosive acetic acid, which is rarely used in production; if zinc oxide, zinc carbonate, zinc hydroxide and other inorganic zinc sources are used, catalysis, high temperature, pressure, and microwave are generally required. Reaction and other harsh conditions

The common shortcoming of above-mentioned existing method is: in the reaction system that glycerin is not only reactant but also solvent, because viscosity is very big, initial stage stirring difficulty, reaction finishes and cools back glycerin and glycerol zinc form slurry, causes glycerol zinc and glycerin Glycerin is not easy to separate phases, so it needs to be centrifuged for layering or pour a large amount of solvent that is miscible with glycerin into the reacted mixture to facilitate filtration

Therefore, existing methods easily lead to the loss of glycerin and washing solvent, causing environmental pollution

In addition, recovery of glycerin and solvents will increase production costs