甲阶酚醛树脂的合成及其发泡性能研究

Study on Synthesis and Foaming Properties of Phenolic Resol Resin

以苯酚、甲醛为原料,氢氧化钠为催化剂,合成了可发性甲阶酚醛树脂。采用物理发泡剂、复合酸固化剂对所制备的甲阶酚醛树脂进行发泡。研究了醛酚摩尔比、反应时间对可发性甲阶酚醛树脂的分子结构、物理性能及其可发性的影响。结果表明:随着醛酚摩尔比的增大,甲阶酚醛树脂的黏度逐渐提高,凝胶时间逐渐缩短。当醛酚摩尔比一定时,随着反应时间的延长,甲阶酚醛树脂的黏度和固含量均增大,凝胶时间缩短。当醛酚摩尔比为1.5、反应时间为200 min时,合成的甲阶酚醛树脂具有良好的可发性。

The foamable phenolic resol resin was prepared taking phenol, formaldehyde as raw material, using NaOH as catalyst. The phenolic foam was prepared by using phenolic resol resin mixed with acid curing agent and physical foaming agent. The effects of molar ratio of formaldehyde/phenol （F/P） and reaction time on the molecular structure, physical properties and foaming behavior of the resol resin were studied. The results show that： with the increase of molar ratio of F/P, the viscosity of resol resin increases, and the gel time of resol resin decreases. With the prolonging of reaction time, the viscosity and solid content of resol resin increase, and the gel time of resol resin decreases. While molar ratio of F/P is 1.5 and reaction time is 200 minutes, the prepared phenolic resol resin has excellent foamability.