适用于树脂传递模塑工艺的耐高温树脂研发

Development of High Temperature Resistant Resin for Resin Transfer Molding Process

为改善树脂传递模塑(RTM)树脂的工艺性和尺寸稳定性,本研究从分子设计的角度出发,合成了一种带有烯丙基结构的苯并噁嗪树脂(Palp)。将Palp、二苯甲烷二胺型双马来酰亚胺(BMI)和二苯甲烷二胺型苯并噁嗪树脂(MDABOZ)按照一定比例混合制得了RTM树脂,并考察了不同配比制得的RTM树脂的性能。结果表明:当Palp,BMI和MDABOZ的质量比为2.2:1.0:3.26时合成的RTM树脂的综合性能较优,100℃下初始黏度低仅为470 mPa·s,100℃维持150 min后也仅有520 mPa·s,展现了树脂良好的工艺性;固化物力学性能优异,其拉伸强度为69.5 MPa,断裂伸长率为1.58%,临界能量释放速率达到278 J/m^(2),同时树脂固化物耐热性优异,固化收缩率低。

In order to improve the processability and dimensional stability of the resin for resin transfer molding(RTM),a benzoxazine resin named Palp with allyl structure was synthesized from the perspective of molecular design.RTM resins were prepared by mixing Palp,diphenylmethane diamine bismaleimide(BMI)and diphenylmethane diamine benzoxazine resin(MDABOZ)in a certain proportion,and the properties of RTM resins prepared with different proportions were investigated.The results showed that the comprehensive performance of the synthesized RTM resin was better when the mass ratio of Palp,BMI,and MDABOZ was 2.2:1.0:3.26.The initial viscosity of the resin was 470 mPa·s at 100℃and maintained 520 mPa·s after 150 min at 100℃,which demonstrated the excellent processability of the resin.The mechanical properties of the cured resin were excellent,the tensile strength was 69.5 MPa,the elongation at break was 1.58%and the critical energy release rate reached 278 J/m^(2).At the same time,the cured resin has excellent heat resistance and low curing shrinkage.