单组分封闭异氰酸酯胶束/聚乙烯醇复合胶粘剂的制备及性能

Preparation and characterization of one-component blocked isocyanate micelle/PVA composite adhesive

采用甲苯二异氰酸酯 TDI 、聚乙二醇（PEG）、二羟甲基丙酸（DMPA）以及封闭剂甲乙酮肟（MEKO）等为主要原料以及聚乙烯醇为复合组分制备了单组分封闭异氰酸酯胶束/聚乙烯醇 BIP/PVA 复合胶粘剂。系统研究了在加热条件下封闭胶束解封闭交联固化反应。考查了封闭异氰酸酯预聚胶束（BIP）对复合乳液稳定性，强度以及耐水性的影响。研究结果表明，复合胶粘剂的固化温度在120~125℃。随着BIP含量增加，复合胶粘剂强度和耐水性提高，但稳定性逐渐下降，当w BIP =15%时，可制得常温（20~30℃）存放3个月以上，干强度超过3.04 MPa，湿强度可达1.29 MPa的单组分BIP/PVA胶粘剂。（）（）（）

The one-component blocked isocyanate micelle/PVA emulsions were prepared from toluene diisocyanate （TDI）, polyethylene glycol （PEG）, dimethylol propionic acid （DMPA）, methyl ethyl ketone oxime （MEKO） as the blocking agent and polyvinyl alcohol （PVA） as the composite component. The deblocking and subsequent crosslinking reaction of the blocked emulsions was systematically researched. Furthermore, the effects of blocked isocyanate pre-polymer micelles （BIP） on the stability, water resistance and strength of the emulsions were investigated. The results showed that this composite adhesive was cured at between 120~125℃. With increasing BIP content, the strength and water-resistance of the composite adhesive was improved but its stability was gradually decreased. When the BIP content was 15 wt%, the storage time was over three months under the room temperature （20~30℃）, and both the wet and dry strength reached 1.29 MPa and over 3.04 MPa,respectively..