采用两步法，先合成热塑性酚醛树脂母体，再对其进行羟甲基化反应得到相对分子量800以上的热固性酚醛树脂。随树脂分子量增大，其凝胶时间缩短，在150℃可以实现〈3min内完全固化。同时随着原料Novolae树脂分子量增大，其改性后树脂溶液的黏度呈增长趋势，凝胶时间缩短；羟甲基化率（决定于甲醛用量）的增加可显著降低改性后树脂溶液的凝胶时间，但对溶液黏度的影响不明显；而反应时间在12h后对于凝胶时间和溶液黏度影响很小。
In this paper the solid resol phenolic resins with high molecular weight were synthesized via a two-step protocol: firstly the Novolac phenolic resins as the raw materials were prepared; then the methylolation was conducted under alkaline catalysis to get resol phenolic resins. With the molecular weight of Novolac resin increasing, the gelation time of resol phenolic resins gradually decreases (all the resins can be cured in 3 rain at 150 ℃ ), while the viscosity of the corresponding resin's solution becomes higher. The dosage of HCHO increasing makes the viscosity of corresponding resin's solution higher. The influence of reaction time to resin's solution is ignorable after 12 h.
参考文献
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