Preparation method of low-temperature curable phthalonitrile resin containing boron and phosphazene structure

The invention relates to a preparation method of low-temperature curable phthalonitrile resin containing a boron and phosphazene structure, and belongs to the technical field of thermosetting resin preparation. The method is simple and easy to operate, the flame-retardant element boron and the flame-retardant structure cyclotriphosphazene are simultaneously introduced into a resin matrix in a covalent bond manner, and complex chemical synthesis steps are avoided to obtain the phthalonitrile resin containing various flame-retardant elements. The problem that introduced flame-retardant elements and flame-retardant structures are incompatible in a resin matrix is solved, and the phthalonitrile resin which has low melt viscosity and can be cured at low temperature is obtained. 本发明涉及一种含硼和磷腈结构可低温固化的邻苯二甲腈树脂的制备方法，属于热固性树脂制备技术领域。本发明通过简单易操作的方法，同时将阻燃元素硼和阻燃结构环三磷腈通过共价键的方式同时引入树脂基体中，避免通过复杂化学合成步骤获得含有多种阻燃元素的邻苯二甲腈树脂。不仅解决了引入阻燃元素和阻燃结构在树脂基体中不相容的问题，还获得了一种具有低熔融粘度、可低温固化的邻苯二甲腈树脂。