The method for the preparation of a pimaric type resin acid

摘要

A Formulation of pimaric acid resin acids, having the following steps, namely, (1) purified resin acids, turpentine or rosin, and, 1 maleic anhydride: 0.3 to 1.5 mass It added to the reaction bottle at a ratio, which was dissolved in _C 1 _{-C 10} lower fatty acid in a solvent, the weight ratio of _C 1 _{-C 10} lower fatty acid to the purified resin acids 0.05 to 30: is 1 , then, subjected to addition reaction by the assist of direct heating or microwave, followed by cooling, combined crystallization, the steps of filtering and washing, the filtrate collected in (2) step (1), pimaric acid the solvent was removed by vacuum distillation in order to get the type resin acid crude product, in order to formulate an aqueous solution of pimaric acid type resin acid salt, the crude product, which said was brought was dissolved in aqueous NaOH solution, stirring at an inorganic or organic acid to adjust the pH value to 6-14, to obtain the final product, or to purify the resulting precipitate directly, or a step for purifying after the acidification. This method has a high yield, high product content, the characteristics of low cost and low environmental pollution. .FIELD 1