纳米SiO_2改性水性聚氨酯胶粘剂的制备及性能

Preparation and properties of nano-SiO_2 modified waterborne polyurethane adhesives

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。

With PBA （po acid） and BDO （ 1,4-butaned yester diol）, IPDI （isophorone diisocyanate）, DMPA （2,2-dihydroxy methyl propionic ol） as raw materials, DBTDL （dibutyltin dilaurate） as catalyst, TEA （triethylamine） as neutralizer, ethylenediamine as chain extender, and water as medium, a nano-SiO2 （ nano-silica ） modified WPU （waterborne polyurethane） adhesive was synthesized by blending or in situ polymerization. The research results showed that the nano-SiO~ can effectively improve the thermal stability of WPU film, and the properties of nano-SiO2modified WPU adhesive prepared by in situ polymerization were better than those by blending. The nano-Si02 modified WPU adhesive prepared by in situ polymerization had the relatively best combination properties when mass fractions of nano-Si02 and DMPA were 2.0% and 4.7% ratio of-NCO to -OH） was 3.0. respectively in prepolymer, and R value （namely molar