Preparation method of hydrogenated bisphenol A epoxy resin

Abstract

The invention relates to a preparation method of hydrogenated bisphenol A epoxy resin. The preparation method comprises the steps of raw material pre-treatment, ring-opening addition and etherifying, ring-closing epoxidation, product post-treatment and the like. The specific steps are as follows: based on hydrogenated bisphenol A and epoxy chloropropane as raw materials, adding solvent; performing ring-opening etherifying by taking Lewis acid as a catalyst to produce chlorohydrin ether immediate; recovering part of the solvent, adding alkali solution and performing ring-closing dechlorinating reaction; carrying out post-treatment steps such as neutralizing, extracting, water washing, vacuum desolventizing to obtain hydrogenated bisphenol A epoxy resin, wherein the epoxide equivalent of the product is 210-240g / eq; the hydrolyzable chlorine content is not more than 1000ppm; the inorganic chloride content is not more than 10ppm; the viscosity is 2000-5000mPas at 25 DEG C; and the volatile component content is not more than 0.1%. The preparation method of hydrogenated bisphenol A epoxy resin has the advantages of stable process, low material and energy consumption, few by-products, simple water-washing and separating operation and high product yield, therefore, the preparation method can be applied in large-scale industrial production.

Description

Technical field [0001] The invention belongs to the technical field of organic polymer compounds, and specifically relates to a preparation method of hydrogenated bisphenol A epoxy resin. Background technique [0002] General-purpose bisphenol-A epoxy resin has disadvantages such as easy weathering, aging, and yellowing when used outdoors. In terms of molecular structure, the reason for the poor weather resistance of bisphenol A epoxy resin is due to the presence of a large number of unsaturated benzene ring structures in the molecular chain. Under the condition of long-term exposure to the atmosphere or ultraviolet rays, the molecular chain is easily broken, resulting in a significant decrease in the transparency, insulation, and strength of the cured bisphenol A epoxy resin. The development of epoxy resin products with strong weather resistance and suitable for outdoor use has become the expectation of epoxy resin production and application manufacturers in my country. [0003]...

AI Technical Summary

Problems solved by technology

Due to the difference in the structure and properties of hydrogenated bisphenol A and bisphenol A, following the general bisphenol A epoxy resin synthesis route will face many difficulties in actual production

For example, a small amount of water in the reaction raw materials causes Lewis acid hydrolysis, which affects the ring-opening effect; hydrogenated bisphenol A is insoluble in toluene, methyl isobutyl ketone (MIBK) and other co-solvents, resulting in difficulty in stirring; hydrogenated bisphenol A molecules at both ends The activity of the hydroxyl group is smaller than that of the hydroxyl group at the two ends of bisphenol A. If the reaction temperature is too low, the reaction will be incomplete, the production cycle will be long, the purity of the product is difficult to control, and there are many by-products, etc.