Synthesis method for low-viscosity high-temperature-resistant modified epoxy resin

Abstract

The invention relates to a synthesis method for low-viscosity high-temperature-resistant modified high-performance epoxy resin. The method comprises the following steps: (1) adding multifunctional epoxy resin into a three-neck flask provided with a thermometer, a stirrer, a nitrogen lead-in pipe and a condenser and gradually heating and stirring; (2) when the temperature is raised to 80 DEG C, dropwise adding unsaturated monocarboxylic acid, adding a catalyst and a polymerization inhibitor, controlling the reaction temperature to be 80-120 DEG C and performing a partial polymerization reaction; (3) measuring the acid value every one hour and reaching a reaction endpoint until the acid value is reduced to 15 mgKOH / g; and (4) cooling a reaction product and adding a cross-linking agent, and controlling the temperature to be 60-80 DEG C and uniformly stirring to obtain the low-viscosity high-temperature-resistant modified epoxy resin. Compared with the multifunctional epoxy resin system, the modified epoxy resin system has the advantages of low viscosity, high activity, high temperature resistance, low cost and the like, is suitable for a resin transfer molding process and is mainly used as matrix resin of an advanced composite material.

Description

technical field [0001] The invention relates to a synthesis method of a low-viscosity high-temperature-resistant modified high-performance epoxy resin, which belongs to the field of polymer materials and composite materials. Background technique [0002] Epoxy resin has good comprehensive mechanical properties, low shrinkage, good stability, and excellent electrical insulation properties. It is used as a matrix resin for coatings, adhesives, and composite materials, and electronic packaging materials, etc. and other fields have been widely used. [0003] After curing, multifunctional epoxy resin has high crosslinking density, large internal stress, high brittleness, low temperature resistance, poor impact toughness, and poor fatigue resistance, which limit epoxy resin as a structural material and the main matrix resin for advanced composite materials. Applications in high-end fields such as aerospace, power electronics, transportation, and adhesives. [0004] Generally, th...

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Problems solved by technology

The patent CN102666635A has the following disadvantages: First, the polymer-supported basic catalyst is chemically bonded to the insoluble polymer through a trivalent organic phosphorus compound and / or amine compound, or the monomer is polymerized after the basic catalyst is introduced into the monomer , and then obtained by three-dimensional cross-linking with cross-linking monomers such as divinylbenzene, so the reaction rate is lower than that of directly adding catalyst in the reaction system, and the catalytic efficiency is low; the second is to inject air into the reaction system during the reaction process Keep the oxygen concentration in the reaction system and the gas phase on the reaction system to prevent resin gelation. At the same time, due to the oxidation of the catalyst, the catalyst activity is reduced, and the reaction rate is further reduced; the third is that no polymerization inhibitor is added to the resin reaction system, which affects its performance. Resin stability during reaction and storage

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