Preparing method for epoxy resin active diluent of low organic chlorine content

Abstract

The process of preparing active epoxy resin diluent with low organochlorine content includes the following steps: mixing alcohol or phenol, benzene solvent and catalyst, dropping chloroepoxy propane into the mixture at 10-55 deg.c for 4-12 hr, and stilling at 20-60 deg.c for 2-4 hr; adding quaternary ammonium salt as the phase transfer catalyst, dropping water solution of sodium hydroxide of 30-50 wt% concentration at 20-55 deg.c for 2-4 hr, raising the temperature by 5-15 deg.c, and maintaining for 1-5 hr; and extracting, neutralizing or water washing to eliminate sodium chloride, and eliminating benzene solvent to obtain active epoxy resin diluent with low organochlorine content. During the ring-closing reaction, phase transfer catalyst, rather than alkali metal hydroxide, is added to result in even high organochlorine eliminating effect.

Description

technical field [0001] The invention relates to a preparation method of a reactive diluent, in particular to a preparation method of an epoxy resin reactive diluent with low organic chlorine content. Background technique [0002] Reactive diluents generally refer to low-molecular compounds with one or more than two epoxy groups, which can directly participate in the curing reaction of epoxy resin and become part of the cross-linked network structure of cured epoxy resin. Almost no effect, the main function of the reactive diluent is to reduce the viscosity of the epoxy resin curing system, and sometimes it can also play the role of toughening, strengthening or flame retardancy. [0003] The preparation method of the active diluent in the prior art: firstly, under the action of a catalyst, monohydric or polyhydric alcohols, phenols, acid anhydrides or carboxylic acids undergo a ring-opening reaction with equal or slightly excess epichlorohydrin, and then use an alkali metal ...

AI Technical Summary

Problems solved by technology

[0003] The preparation method of the active diluent in the prior art: firstly, under the action of a catalyst, monohydric or polyhydric alcohols, phenols, acid anhydrides or carboxylic acids undergo a ring-opening reaction with equal or slightly excess epichlorohydrin, and then use an alkali metal Hydroxide undergoes a ring-closing reaction, and then extracts, washes, and removes the solvent to obtain a reactive diluent. The content of organic chlorine is high (>0.02, eq / 100), and it is difficult to meet the increasingly sophisticated application requirements of epoxy resins.

Usually, the method to reduce the organic chlorine content of active diluent is to increase the amount of alkali metal hydroxide, and reduce the organic chlorine content by using a method with a large amount of hydroxyl substances in alcohol or phenol. The effect of this method is not obvious. Moreover, more production process wastewater will be generated, which will increase the consumption of alkali metal hydroxides and increase production costs.