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Preparation and application of waterborne polyurethane adhesive for packing drugs

Hao Xiaofang;Xiang Shanglin;Shi Lei;Liu Chao;Wu Xinshang;College of Materials Science and Engineering,Nanjing University of Technology;Jiangsu Province Medical Instrument Testing Institute;Jiangsu Zhongjin Matai Medicinal Packaging Co.,Ltd.;  
With IPDI(isophorone diisocyanate),sulfonated polyester polyol and DMPA(dihydromethyl propionic acid) as main raw materials,a WPU(waterborne polyurethane) adhesive for packing drugs was prepared. Then,the WPU adhesive was coated on aluminum foil,so a corresponding aluminum foil tape,which some properties such as barrier property,heat-seal strength,easy oxidizable substance contents and residual organic solvent contents were tested,was prepared. The research results showed that the barrier property,heat-seal strength(11.9 N/15 mm), easy oxidizable substance contents(not more than 0.5 mL) and residual organic solvent contents could all meet application requirements of material for packing drugs when R value or molar ratio of n(-NCO in IPDI)/n(-OH in sulfonated polyester polyol) was 3.5.
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