Method for preparing modified phenolic resin by adopting cardanol

Abstract

The invention provides a method for preparing modified phenolic resin by adopting cardanol. The method adopts phenol, methanal, the cardanol, auxiliary agent and hydrochloric acid to have reaction; the pH value of a reaction system is controlled to be within the range of 1.5-2.0, the temperature is slowly raised to 80-90DEG C, and then heating is stopped; the heat of the reaction is released untilthe temperature of the reaction system is 100 DEG C, and the reactant begins to boil; and after heat preservation reaction is stabilized for 2-3h, decompression dehydration can be carried out, so that the phenolic resin can be obtained. The performance of the modified phenolic resin can be measured under the experiment condition, the softening point is 82-90 DEG C, the flowing degree is 2.9-5.0cm, the polymerization speed is 60-90S, the viscosity is 12-15mpa*s, and the temperature is 25DEG C. The method can greatly reduce the manufacturing cost of the phenolic resin, so that the phenolic resin has good market prospect. The phenolic resin is environment-friendly and has no volatile component, thus being successfully applied to the coating industry by consumers. Furthermore, the method improves the inoxidizability and the heat resistance of the phenolic resin.

Description

Technical field: [0001] The invention relates to the field of chemical industry, in particular to a method for preparing a polymer compound, in particular to a method for preparing a modified phenolic resin by using cardanol. Background technique: [0002] There have been many reports on the application of cardanol in phenolic resins, but the amount of replacing phenol is not high, generally around 10%. Nguyen et al. believe that when the amount of cardanol is not more than 15%, the synthetic resin can significantly improve the performance of the resin. Chemical resistance and tensile and flexural strength of the resin. [0003] Cardanol is modified into a reactive diluent to replace similar products on the market. Through modification, cardanol becomes a surface active dilution catalyst. This cardanol surfactant can soften the phenolic resin. Since the discovery of phenolic resin by the chemist Bayer in 1872, the phenolic resin has developed rapidly due to its unique perf...

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of method that adopts cardanol to prepare modified phenolic resin, the preparation method of described this modified phenolic resin will solve t