丁腈橡胶增韧环氧树脂基烧蚀防热材料性能

Properties of Ablative Material Based on Epoxy Resin Modified by CTBN

以丁腈橡胶(CTBN)为增韧剂对环氧树脂(F51)进行增韧改性,通过FTIR、TG以及力学性能测试研究了丁腈橡胶对环氧树脂固化反应、热稳定性能和力学性能的影响,并分析了其增韧机理;分别采用燃气流剪切烧蚀试验和电弧风动烧蚀实验考核了低密度烧蚀材料的烧蚀性能。结果表明:经CTBN改性后,两者的分子链产生了一定程度的交联;树脂基体的拉伸、弯曲性能有所下降,但韧性得到了增强;热稳定性大大提高,增韧后的F51树脂在800℃时的残重率由增韧前的23%提高到了54%;低密度烧蚀材料的抗剪切、抗剥蚀能力得到了增强,且碳层的尺寸稳定性也得到了改善,烧蚀性能提高。

The epoxy resin（ F51） was modified by acrylonitrile butadiene rubber（ CTBN） to improve its toughness. The structure and properties of the modified resin were characterized by SEM,FTIR,TG and mechanical facilities. The modified mechanism was discussed. The ablative properties of the low density material which made by the modified epoxy resin was checked by gas jet and wind tunnel experiments. The results show that after the modification of CTBN,the molecular chains have a certain degree of cross-linking. The tensile and bending properties of resin matrix decreased,but the toughness was enhanced. Thermal stability is greatly increased. At 800 ℃,the rate of the residual weight of the toughening F51 increased to 54% from 23%. The shear resistance and erosion resistance of lowdensity ablative materials have been enhanced,and the stability of the carbon layer has been improved,and the ablative properties have been improved.