Boric acid modified phenolic resin and preparation method thereof

The invention discloses a boric acid modified phenolic resin, which comprises phenol, paraformaldehyde, and boric acid, wherein the mole ratio of phenol to paraformaldehyde is 1.0:1.2, and boric acid accounts for 8% of total weight of phenol, paraformaldehyde, and boric acid. The synthesized modified phenolic/epoxy resin is high temperature resistant; the decomposition temperature of the modified resin is raised to 500 DEG C or more, and the heatproof performance of the resin can meet the requirements. Compared with conventional phenolic resin, the boric acid modified resin has a better heatproof performance. The impact toughness of high temperature braking friction materials and burning resistant products, which are prepared from the boric acid modified phenolic resin, is obviously improved. 本发明公开了种硼改性酚醛树脂，其原料包括苯酚、多聚甲醛和硼酸，其中苯酚和多聚甲醛的摩尔比为1.0：1.2，而硼酸占苯酚、多聚甲醛和硼酸三者组分之和的8%。本发明合成的改性耐高温酚醛/环氧树脂，从本质上提高改性树脂的分解温度达到500℃以上，保证树脂的耐热性能满足预期要求。硼改酚醛树脂具有比传统酚醛树脂更加优异的热性能，使以硼改酚醛树脂为基体生产的高温制动摩擦材料、耐烧蚀材料制品的冲击韧性得到显著的提高。