常温下酚醛树脂的可发性研究

研究了酚醛树脂常温发泡的最适宜条件。结果表明,甲醛与苯酚的摩尔比为1.8~2.0,树脂粘度在2~4 Pa.s(36℃),树脂固含量在78%~81%的甲阶酚醛树脂常温发泡效果最好;环境温度在17~25℃时,最适宜常温发泡;发泡剂用量与泡体性能的关系为:发泡剂用量增大,泡沫体表观密度和压缩强度降低,发泡剂用量14.0%后,泡沫体的密度变化不大。环境温度不同,固化剂的种类与比例也不同。

Study on the foamable of phenolic resin at room temperature

In this paper,phenolic resin at room temperature for the most appropriate conditions for foaming.The results showed that molar ratio of formaldehyde to phenol 1.8 to 2.0,the resin viscosity at the 2~ 4 Pa·s(36 ℃),resin which solid content of 78%~ 81% of the A class of phenolic resin foam best at room temperature;ambient temperature at 17~25 ℃,the most appropriate foaming at room temperature;blowing agent usage and the relationship between the performance of foam body are:increased use of foam,foam density and compressive strength,surface view of lower-fat,foam dosage of more than 14.0%,the little change in the density of foam.The ambient temperature is different from the kinds and proportions of curing agents are also different.