论文部分内容阅读
以PBA(聚酯二元醇)、IPDI(异佛尔酮二异氰酸酯)、DMPA(2,2-二羟甲基丙酸)和BDO(1,4-丁二醇)为原料,DBTDL(二月桂酸二丁基锡)为催化剂,TEA(三乙胺)为中和剂,乙二胺为扩链剂,水为介质,采用共混法和原位聚合法合成了纳米SiO_2(纳米二氧化硅)改性WPU(水性聚氨酯)胶粘剂。研究结果表明:纳米SiO_2能有效提高WPU胶膜的热稳定性,并且采用原位聚合法制得的纳米SiO_2改性WPU胶粘剂之性能优于共混法;当w(纳米SiO_2)=2.0%、w(DMPA)=4.7%(均相对于预聚体质量而言)和R=n(—NCO)/n(—OH)=3.0时,采用原位聚合法制得的纳米SiO_2改性WPU胶粘剂的综合性能相对最佳。
Starting from PBA (polyester diol), IPDI (isophorone diisocyanate), DMPA (2,2-dimethylolpropionic acid) and BDO (1,4-butanediol) (Dibutyltin laurate) as catalyst, TEA (triethylamine) as neutralizer, ethylenediamine as chain extender and water as media, nanosilica (nanosilica) was synthesized by blending and in situ polymerization. Modified WPU (water-based polyurethane) adhesive. The results show that: nano-SiO_2 can effectively improve the thermal stability of WPU film, and the performance of the nano-SiO_2 modified WPU adhesive prepared by in situ polymerization method is better than the blending method; when w (nano SiO 2) = 2.0%, w (DMPA) = 4.7% (both relative to the mass of prepolymer) and R = n (-NCO) / n (-OH) = 3.0, the synthesis of nano-SiO_2 modified WPU adhesive prepared by in-situ polymerization Relatively best performance.