有机酸对H发泡剂分解历程的影响及作用机制分析

为研究有机酸对H发泡剂热分解特性的影响,采用量热仪测试不同质量分数苯甲酸、水杨酸、邻苯二甲酸与H发泡剂混合物的热分解特性参数.结果表明:H发泡剂分解时,随着升温速率增加,外推起始分解温度Te、峰值温度Tp与最大放热速率随之升高.3种有机酸的加入均可以促进H发泡剂的分解,随着有机酸质量分数的增加,其外推起始分解温度和峰值...

Analysis on influence and action mechanism of organic acid on decomposition process of H foaming agent

In order to study the influence of organic acid on the thermal decomposition characteristics of H foaming agent,the thermal decomposition characteristic parameters of the mixture of benzoic acid,salicylic acid,phthalic acid and H foaming agent with different mass fractions were measured by the calorimeter.The results showed that when the H foaming agent decomposed,the extrapolated initial decomposition temperature T_e,the peak temperature T_p and the maximum heat release rate increased with the increase of heating rate.The addition of three organic acids could all promote the decomposition of H foaming agent.With the increasing mass fraction of organic acid,the extrapolated initial decomposition temperature and the peak temperature presented a synchronous decrease trend.The H+generated from the melting of organic acids had a significant effect on the decomposition process of H foaming agent.The addition of salicylic acid could significantly reduce the heat release rate of the decomposition of H foaming agent,and reduce the thermal risk in the decomposition process of H foaming agent.When the mass fraction of salicylic acid reached 24%,the extrapolated initial decomposition temperature of H foaming agent reduced by 20℃compared with that mixed by benzoic acid and phthalic acid.