多羟基化合物改性聚氨酯胶黏剂的制备与应用

Synthesis and application of polyurethane modified by hydroxyl compound

采用预聚体合成法,以二羟甲基丙酸(DMPA)、葡萄糖(PG)为亲水扩链剂和交联剂制备一种水性聚氨酯预聚体,再将羧基丁苯胶乳(CSBL)水乳液与去离子水混合均匀进行乳化,制得固含量高达50%的水性聚氨酯(WPU)胶黏剂。利用傅里叶变换红外光谱仪(FTIR)对胶膜结构进行表征,证实葡萄糖已引入聚氨酯主链。热失重分析表明,PG改性后的聚氨酯胶膜热稳定性增强。研究了PG用量对胶黏剂的T-剥离强度和固化时间的影响。随着PG用量的增加,T-剥离强度逐渐增强,当PG质量分数从0%增加到4.68%时,T-剥离强度由57.3 N/(2.5 cm)上升至116.1 N/(2.5 cm),相同处理温度下聚氨酯胶液的固化时间缩短。

Waterborne polyurethane prepolymer is synthesized by a prepolymer process using dimethylol propionic acid （DMPA） and glucose as hydrophilic agent and crosslinking agent, respectively, and the waterborne polyurethane adhesive （WPU） emulsion with solid content of 50% is obtained when emulsified with the mixture of carboxy styrenebutadiene latex （CSBL） and deionized water. The structure of films is confirmed by means of FTIR. The test results indicate that the glucose is introduced into the main chain of polyurethane. TG analysis indicates that the thermal stability of WPU films modified with glucose can be improved. The effect of the glucose content on the final T-peel strength and curing time of the WPU adhesive are studied. The results show that when glucose content increases from 0% to 4.68% , the final T-peel strength increases from 57.3 N/（2. 5 cm） to 116. 1 N/（2.5 cm） ,and the curing time of WPU samples decreases with increasing glucose content at the same treating temperature.