硼酚醛树脂的合成及其模塑料的表征

Synthesis and Modification Development of Phenolic Resin Modified by Boron

研究了硼酚醛树脂合成时间、固化工艺以及模压工艺对硼酚醛模塑料力学性能及耐热性的影响。结果表明:第一步反应时间为9 h,第二步反应时间为4 h,自制的硼酚醛的吸光度(8.5%)明显高于市售硼酚醛的吸光度为(3.1%);对硼酸质量分数为8%、9%、10%以及市售(3%)硼酚醛模塑料进行性能测试,结果发现:随着硼含量的提高,耐热性提高,但当硼酸加入量超过9%时,力学性能有所下降;酸性条件下,出现硼酚醛与固化剂在常温下固化的现象,生成不溶不熔的固化产物成为内应力的来源,反应后水洗至中性的硼酚醛树脂其马丁耐热温度以及弯曲强度均有所提高。

Mainly discussed the influence of synthesis time, curing process and molding process on the mechanical properties and thermal properties of boron-modified phenolic resin （BPR）. The results showed that： when the first step reaction time was 9 h, the second step reaction time was 4 h, the absorption of homemade BPR （ absorption = 8.5 % ） was significantly higher than that of marketed BPR （ absorption = 3.1% ）. Properties test was carried out on the homemade BPR with 8 wt%, 9 wt%, 10 wt% and BPR with 3 wt% boron bought on the market. The result showed that with the increase of boron content, heat resistance of BPR molding plastics increased, but when the amount of boron reached to more than 9% the mechanical properties decreased. Under acidic condition, BPR and curing agent cured at room temperature, generating insoluble product which was the source of internal stress. When washed to neutral by water after reaction, martin heat resistant and flexural strength of BPR were both improved.