Synthesis method of modified epoxy vinyl ester resin

Abstract

The invention belongs to the technical field of macromolecule polymer and relates to a synthesis method of modified epoxy vinyl ester resin. The synthesis method includes the following steps: according to mass percent, adding 35-50% of epoxy resin, 8-20% of unsaturated monocarboxylic acid, 4-18% of dicyclopentadiene maleic acid, 0.1-1.0% of catalyst and 0.01-0.1% of flame retardant in a reactor. The mixture reacts at 90-120 DEG C until the acid value reduces to below 10mg KOH / g at end point of reaction. When cooled below 110 DEG C, 25-40% of crosslinking agent is added. Uniform stirring is conducted at below 70 DEG C to get modified epoxy vinyl ester resin. The advantages of the method are as follows: by replacing the unsaturated monocarboxylic acid partially or wholly with dicyclopentadiene maleic acid to react with epoxy resin, being simple in operation, little of side reaction, easy control on reaction end point, environment-friendly; and producing products fine in air drying property, quick in curing speed, high adhesion of film painting, low contractibility rate and good in corrosion resistance. The synthesis method is applicable to making various products of composite materials and dies.

Description

technical field [0001] The invention belongs to the technical field of polymers, and relates to a method for synthesizing a modified epoxy vinyl ester resin, in particular to a synthetic method of a modified epoxy vinyl ester resin with excellent air-drying property, low shrinkage rate and low cost method. Background technique [0002] Epoxy vinyl ester resin has the excellent properties of epoxy resin and unsaturated polyester resin, so it has been widely used in chemical anti-corrosion, flue gas desulfurization, transportation, electronic appliances, boats and other aspects. However, when the epoxy vinyl ester resin undergoes a copolymerization reaction, the surface layer in contact with the air is prone to stickiness. The sticky surface layer has poor corrosion resistance to acids, alkalis, salts or solvents, and whitening occurs when it meets water, which affects the quality of composite products and even causes waste products. This phenomenon is especially obvious in t...

AI Technical Summary

Problems solved by technology

Chinese patent 200810036708.7 discloses a synthesis method of air-drying epoxy vinyl ester resin, but the shortcoming of this synthesis method is: the end point of the first step reaction to generate epoxy vinyl ester resin is determined by the reaction time , when the first step reaction ends, there are still some reactants incompletely, and the dicyclopentadiene added dropwise in the second step reaction is easy to produce various unwanted side reactions with the above-mentioned raw materials, resulting in poor quality of the final product. stability, reduced product performance, etc.