VRLA高温电池用耐热阻燃ABS热降解行为分析

Analysis of thermal degradation behavior of heat resistant and flame retardant ABS resin for high temperature VRLA battery

本文通过热重法(TG-DTG)比较高温VRLA蓄电池槽用的耐热阻燃ABS与普通ABS电池槽材料在热降解过程中的差异,并采用Flynn-Wall-Ozawa法求得其反应活化能。结果显示,耐热阻燃ABS的初始热降解温度降低,但热降解速率降低且热降解温度范围扩大,炭化残重也有所增加。同时其活化能(Ea)随失重率(α)变化较复杂,α在0.2时耐热阻燃ABS的Ea相对较低,仅155.5 k J/mol,比纯ABS的低约50 k J/mol,在α大于0.3以后其Ea均比纯ABS的大,最大约243.6 k J/mol,比纯ABS的Ea大52 k J/mol左右。

The differences between heat resistant and lfame retardant ABS resin for high temperature VRLA battery and pure ABS resin in the thermal degradation process were studied by the thermogravimetry （TG-DTG）, and their activation energy was calculated with Flynn-Wall-Ozawa equation in this paper. The results showed that the initial thermal degradation temperature of the heat resistant and flame retardant ABS dropped, meanwhile the degradation rate decreased, thermal degradation temperature range expanded and residual weight also increased. At the same time, the activation energy （Ea） changes with weight loss （α） were more complex, whenαis 0.2, Ea of the heat resistant and lfame retardant ABS was 155 kJ/mol, and 50 kJ/mol lower than that of pure ABS, whenαis greater than 0.3, Ea of heat resistant and lfame retardant ABS was 243.6 kJ/mol, and greater than that of pure ABS about 52 kJ/mol.