A kind of preparation method of chlorinated rubber

Abstract

The invention discloses a preparation method of chlorinated rubber. The preparation method includes the steps that firstly, natural rubber is added into a reaction kettle containing reaction media and auxiliaries, stirring is performed for 10-20 min, the weight ratio of natural rubber to the reaction media and to the auxiliaries is 1: (10-15): (0.02-0.15), and the reaction media are a hydrochloric acid solution with the mass fraction being 10-15%; secondly, chlorine is added into the reaction kettle, a chlorination reaction is performed, a coarse chlorinated rubber product is obtained, and a chlorination reaction condition includes that firstly reaction is performed at 90-110 DEG C for 2-3 h, and then reaction is performed at 50-70 DEG C for 2-3 h; thirdly, the coarse chlorinated rubber product obtained in the second step is subjected to deacidifying treatment, and chlorinated rubber is obtained through drying. The chlorinated evenness degree is high, the chlorination degree is high, product transparency is high, and solubility is good.

Description

technical field [0001] The invention belongs to the field of chemical synthesis, and in particular relates to a preparation method of chlorinated rubber. Background technique [0002] Chlorinated rubber is a kind of organic polymer chlorinated synthetic resin, which is made by reacting natural or synthetic rubber polyprene with chlorine gas. It is an important rubber derivative in the field of rubber. It has good molding and adhesion properties. , is an important film-forming base material for medium and high-grade paints. At present, the methods for producing chlorinated rubber include solid-phase method, emulsion method, carbon tetrachloride solvent method and water-phase method. Among them, the solid-phase method is to grind and mix natural rubber and sodium sulfate, and pass chlorine in a pressure reactor. Greening, but because the solid phase method cannot solve the problem of heat dissipation, the product has poor thermal stability, dark color, and cannot be applied in...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome defects such as uneven chlorination of products, low chlorination degree, poor product transparency and poor solubility in the existing preparation method of chlorinated rubber, and provide a chlorination uniformity high, chlorination degree Preparation method of chlorinated rubber with high product transparency and good solubility

Uneven chlorination will lead to poor transparency, poor solubility of insoluble particles, easy layering of products, etc., and the viscosity often does not meet the requirements

The chlorination of natural rubber is extraordinarily complex, including not only substitution reactions but also double bond addition reactions in isoprene units. The inventors discovered in their research that the chlorination of natural rubber can be achieved by adjusting the reaction temperature using high temperature- Low-temperature two-stage reaction is optimized, and the chlorination reaction with a suitable additive formula can solve the problem of long chlorination time and uneven chlorination of natural rubber in the aqueous phase method, thereby solving the problems of poor product transparency, poor solubility, and product layering And other issues

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