【摘要】 利用凝胶脱水率的测定,研究了甲阶酚醛树脂/硼酸盐水凝胶的脱水性能。结果表明,甲阶酚醛树脂/硼酸盐水凝胶的脱水速率与其硼砂浓度、碱浓度、添加剂的种类和浓度,以及脱水的温度有关。随着硼砂浓度的增大,凝胶的脱水速率先减小,后增大,在0.125mol/L时达到最小值。升高温度凝胶的脱水速率明显加快。添加不易挥发的醇或醚,可以有效地抑制凝胶的脱水;随着添加剂浓度的增大,凝胶的脱水速率先减小,后增大。凝胶中的碱含量越高,凝胶越难脱水。更多还原

【Abstract】 Dehydration behaviours of phenol formaldehyde resin-borate hydrogels were studied by the measurement of dehydration proportions. The results show that dehydration rate of the hydrogels depends on sodium tetraborate concentration, alkaline concentration, additives type and concentration, as well as the dehydration temperature. The dehydration rate increases at first with the increasing of the sodium tetraborate concentration, and then decreases. The dehydration rate increases obviously with increasing of the temperature. Dehydration rate of the hydrogels increases after adding the non-volatile alcohol and ether. Dehydration rate increases with the increasing of additive concentration, and then decreases. Dehydration rate decreases when increasing alkaline concentration in the hydrogels.更多还原