环氧树脂对酚醛泡沫的改性研究

摘要

以热固性酚醛树脂为原料,有机对甲苯磺酸为固化剂,环氧树脂为改性剂,制备了环氧树脂改性的酚醛泡沫(PF),探讨了环氧树脂用量对PF物理性能的影响.结果表明,加入环氧树脂改性后,PF的表观密度、压缩强度、热导率、pH值均高于未改性PF;当环氧树脂用量从2％(质量分数,下同)增加到8％时,改性PF的表观密度、热导率、粉化度均呈下降趋势,压缩强度呈先上升后下降的趋势,pH值呈上升的趋势,热稳定性有所提高;当环氧树脂加入量为酚醛树脂质量的6％时,改性PF的物理性能最好.%Phenolic foam (PF) was prepared by using thermosetting phenolic resin as a raw material,p-toluenesulfonic acid as a curing agent and epoxy resin as a modifier.Effect of the amount of epoxy resin on the properties of PF was investigated.The results indicated that the apparent density,compression strength,thermal conductivity and pH value of PF were all improved due to the modification of epoxy resin.When the amount of epoxy resin was increased from 2 wt％ to 8 wt ％,the modified PF exhibited a decreasing trend in apparent density,thermal conductivity and degree of powder but an increasing trend in thermal stability and pH value.However,its compression strength increased at first and then tended to decrease.The modified PF achieved the maximum comprehensive properties when 6 wt ％ of epoxy resin was introduced.