合成条件对氨催化酚醛树脂结构的影响

利用红外光谱分析研究了反应温度、时间、催化剂用量,原料配比对合成的氨催化酚醛树脂中的羟甲基含量、邻对位取代比例、醚键含量和残炭率的影响。结果表明,合成条件不同,酚醛树脂中各特征基团含量变化明显,其中,邻对位取代比例变化较大,当氨水用量为4%时,邻、对位取代比值达到1.56。控制反应温度90℃,反应时间130~150 min,催化剂氨的用量3%~4%,甲醛、苯酚物质的量比为1.25时,树脂残炭率可达到49%左右。

Influence of synthetic conditions on the structure of ammonia-catalyzed phenolic resin

The influence of synthetic conditions such as reaction temperature,time,catalyst amount and ratio of formaldehyde to phenol on the the content of hydromethyl,orth-para substitution ratio,ether bonds content and carbon yield of synthesized ammonia-catalyzed phenolic resin was investigated by IR analysis.The results showed that the characteristic group contents changed obviously under different synthetic conditions.The orth-para substitution ratio changed greatly and reached 1.56 with the ammonia amount 4%.Th...