Self-toughened benzoxazine thermosetting resin and method for preparing same

Abstract

The invention provides self-toughened benzoxazine thermosetting resin with structures shown as a formula I. The self-toughened benzoxazine thermosetting resin has the advantages that long alkyl chainsare led into chemical structures of benzoxazine, accordingly, toughening effects can be realized, and the self-toughened benzoxazine thermosetting resin has self-toughened characteristics; the long alkyl chains are led into the chemical structures of the benzoxazine in chemical bond forms, and accordingly the problem that the traditional added toughening agents are dissolved out due to poor compatibility can be effectively solved; the long alkyl chains are added into the self-toughened benzoxazine thermosetting resin, the concentration of oxazine rings can be diluted, and accordingly the curing temperature of the self-toughened benzoxazine thermosetting resin can be obviously lowered; the long alkyl chains are led into the structures of the benzoxazine, good internal plasticization effects can be realized, and accordingly the toughness of self-toughened benzoxazine thermosetting resin cured substances can be greatly improved.

Description

technical field [0001] The invention relates to the technical field of organic polymer materials, in particular to a self-toughening benzoxazine thermosetting resin and a preparation method thereof. Background technique [0002] Benzoxazine resin (benzoxazine) refers to a class of aromatic polymers containing oxazine rings. It is one of the organic polymer materials with the best comprehensive performance. It has high temperature resistance, flame retardancy, excellent mechanical properties, low surface energy, The advantages of flexible monomer structure design, corrosion resistance, etc., and small thermal expansion coefficient, good wear resistance, excellent dielectric properties, have been widely used in electronics, aerospace and other fields. However, because of its high rigid structure content, the cured polybenzoxazine has the problems of poor toughness and low elongation at break. [0003] In view of the above problems, the conventional improvement method is to ad...

AI Technical Summary

Problems solved by technology

However, due to its high rigid structure content, the cured polybenzoxazine has the problems of poor toughness and low elongation at break

[0003] In view of the above problems, the conventional improvement method is to add tougheners such as elastomers, but after adding elastomer tougheners, due to the problem of poor compatibility, it is easy to cause phase separation during the use of benzoxazine resins. And lead to the problem of elastomer precipitation

In addition, traditional benzoxazines generally have the problem of high curing temperature, which is about 250°C

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