酚醛泡沫力学性能及其密度-力学性能模型研究

摘要

以多聚甲醛代替甲醛溶液制备高固含可发性酚醛树脂,在70℃发泡制备酚醛泡沫材料,研究了表面活性剂、固化剂和发泡剂对泡沫的密度、力学性能的影响.研究结果表明,在表面活性剂添加量为12％,固化剂添加量为30％,发泡剂添加量为5％时,制备的泡沫性能较优.通过Gibson-Ashby提出的泡沫塑料的力学性能与密度的关系模型,创建酚醛泡沫密度-力学性能模型,结果表明泡沫力学性能与密度呈现良好的指数关系,且间接拟合和直接拟合2种方法得出的模型指数基本相符.%Paraformaldehyde was used to instead of formaldehyde to prepare high solids and expandable phenolic resin, and phenolic resin was used to prepare phenolic foam at 70℃. The influences of the surface-active agent,curing agent and blowing agent on foam density, mechanical properties were researched. The results showed that when the amount of surfactant,blowing agent,curing agent was 12%,30%,5% respectively,the properties of foam was better. The model of phenolic foam density-mechanical properties was established by the foam model of Gibson-Ashby's mechanical properties and density, the results showed that there was good exponential relationship between mechanical properties and density, and exponents acquired by indirect and direct fitting were basically consistent.