A kind of bisphenol A isocyanate phenolic resin and preparation method thereof

Abstract

The invention discloses a bisphenol A isocyanate phenolic resin and a preparation method thereof. In the method, hexamethylene diisocyanate is used as a graft monomer and dibutyltin dilaurate is used as a catalyst, so that the hexamethylene diisocyanate is Under the action, the graft is formed, so that the originally rigid bisphenol A formaldehyde novolac resin and hexamethylene diisocyanate, because the isocyanate is easy to react with the polyhydroxy compound, and the reactivity of the isocyanate is very high, it can be used at room temperature. Chemical reactions can occur, which improves the low reactivity of bisphenol A formaldehyde phenolic resin at room temperature, the preparation process is complex, and high energy consumption is required during the reaction; the preparation process is simple, and the bulk reaction is used to make it react more fully High, the prepared bisphenol A isocyanate phenolic resin, because the isocyanate group replaces the hydroxyl group on the bisphenol A formaldehyde phenolic resin, it weakens its hydrophilicity and increases its waterproof performance.

Description

【Technical field】 [0001] The invention belongs to the field of adhesives, and in particular relates to a bisphenol A isocyanate phenolic resin and a preparation method thereof. 【Background technique】 [0002] Bisphenol A formaldehyde phenolic resin is liquid at room temperature, and it is a thermoplastic linear polymer. Under normal temperature or heating conditions, bisphenol A formaldehyde phenolic resin reacts with curing agent and cross-links to form an insoluble three-dimensional network structure polymer plastic. , and shows its inherent excellent performance, widely used in automobiles, ships, aviation, machinery, chemical industry, electrical and electronic industry, heavy machinery manufacturing industry, large-scale water conservancy engineering and civil construction industry and other fields. Bisphenol A formaldehyde phenolic resin has excellent adhesion, corrosion resistance, electrical insulation, mildew resistance, heat and cold resistance, and good mechanical...

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Problems solved by technology

Bisphenol A formaldehyde phenolic resin has excellent adhesion, corrosion resistance, electrical insulation, mildew resistance, heat and cold resistance, and good mechanical properties, however pure bisphenol A formaldehyde phenolic resin has a high cross-linking Density, so there are brittleness, fatigue resistance, heat resistance, impact toughness, and the hydroxyl group is exposed on the outside, so its water resistance is average. The above shortcomings are difficult to meet the requirements of engineering technology, so that it is subject to certain development restrictions in the application field. , so the modification of bisphenol A formaldehyde phenolic resin to improve its water resistance has always been a hot research direction for researchers.

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