高羟甲基低游离醛含量甲阶酚醛树脂的合成

Synthesis of resole phenol-formaldehyde resin containing high methylol group and low free formaldehyde content

以苯酚和甲醛为原料,CaO为催化剂,用甲醛两次分批加入的方法合成了高羟甲基低游离醛含量的甲阶酚醛树脂.采用正交试验探讨了原料摩尔比、催化剂用量、反应时间、反应温度对合成的酚醛树脂中游离醛和羟甲基含量的影响.结果表明,催化剂用量对树脂中游离醛和羟甲基含量的影响最显著,优化出合成工艺的适宜条件为:酚醛比1.6、催化剂用量0.07mol、反应时间3h、反应温度80℃.由树脂的红外光谱分析可知,树脂中羟甲基含量高,有利于发泡过程中的固化反应.

In order to further prepare the phenolic foam plastic with good properties,synthetic conditions of resole phenol-formaldehyde resin were studied in this paper. A resole phenol-formaldehyde resin containing high methylol group and low free formaldehyde content was synthesized from phenol and formaldehyde using calcium oxide as catalyst,and in twice addition of formaldehyde process step. The effects of reactant molar ratio,the amount of catalyst,reaction time,reaction temperature on the indexes of content of free formaldehyde and methylol group were investigated by means of orthogonal experiment. The results show that the amount of catalyst had the most prominent effect on free formaldehyde and methylol group contents in resin,the optimum technological parameters of resole phenol-formaldehyde resin were：reactant molar ratio 1.6,the amount of catalyst 0.07 mol,reaction time 3 hours,reaction temperature 80 ℃. The FTIR show that a large number of methylol groups in resole phenol-formaldehyde resin were beneficial to the solidify reaction in the foaming process.