Epoxy resin modified by isocyanate terminated silicon rubber and preparation method thereof

Abstract

The invention discloses epoxy resin modified by isocyanate terminated silicon rubber and a preparation method thereof. The epoxy resin modified by the isocyanate terminated silicon rubber consists of the isocyanate terminated silicon rubber, epoxy resin and a catalyst, wherein the isocyanate terminated silicon rubber consists of silicon rubber with end hydroxyl group, toluene di-isocyanate and a catalyst. The preparation method for the epoxy resin modified by the isocyanate terminated silicon rubber comprises two steps of preparing the isocyanate terminated silicon rubber and preparing the epoxy resin modified by the isocyanate terminated silicon rubber. In the preparing process, the flexible isocyanate terminated silicon rubber is compounded with the epoxy resin to increase the toughness of the epoxy resin, and simultaneously hydroxyl group on the epoxy resin is chemically bonded with isocyanate group on the isocyanate terminated silicon rubber to increase the tensile strength of the epoxy resin, so the impact strength and the tensile strength of the epoxy resin modified by the isocyanate terminated silicon rubber are all obviously improved compared with those of common epoxy resin under the same curing condition.

Description

technical field [0001] The invention relates to a modified epoxy resin and a preparation method thereof, in particular to an isocyanate-terminated silicone rubber modified epoxy resin and a preparation method thereof. Background technique [0002] Epoxy resin is an important class of thermosetting resins, which are widely used in adhesives, coatings, electrical and electronic insulation materials, reinforcing materials and advanced composite materials. However, the general epoxy resin cured product has high brittleness, low toughness and poor impact performance, which limits its application in impact-resistant flooring and some electronic and electrical fields. The toughening method of epoxy resin is generally to add thermoplastic resin. The effect is that the impact strength of the cured epoxy resin is improved, but the tensile strength will be reduced, which limits its application. Contents of the invention [0003] One of object of the present invention provides a kind...

AI Technical Summary

Problems solved by technology

However, the cured epoxy resin has high brittleness, low toughness and poor impact performance, which limits its application in impact-resistant flooring and some electronic and electrical fields.

The toughening method of epoxy resin is generally to add thermoplastic resin, the effect is that the impact strength of epoxy resin cured product will be improved, but the tensile strength will decrease, so its application has limitations