蓖麻油改性无溶剂型双组分聚氨酯复膜胶

以蓖麻油、苯酐和二甘醇等为原料,经酯化、缩聚后,合成了蓖麻油改性聚酯多元醇,并以此作为复膜胶的固化剂;以MDI-50(二苯基甲烷二异氰酸酯)、PPG-2000/PPG400(聚醚二元醇)为原料,合成了端-NCO基聚氨酯(PU)预聚体,并以此作为复膜胶的主剂;将主剂和固化剂按一定比例混合后,制得无溶剂型双组分PU复膜胶。研究结果表明:当反应温度为45℃、反应时间为3 h和w(-NCO)=18%时,主剂的黏度、流动性相对最好;当双组分中n(-NCO)∶n(-OH)=1.9∶1、固化温度为50℃、固化时间为24 h和w(蓖麻油)=28.3%时,复膜胶的粘接性能相对最好,并且接近于进口同类产品。

Castor oil modified two-components PU laminating adhesive without solvent

With castor oil,phthalic anhydride and diethylene glycol as raw materials,a polyester polyol modified by castor oil,which could be used as curing agent of laminating adhesive,was synthesized by esterification and polycondensation.With MDI-50(diphenyl methane diisocyanate) and PPG-2000/PPG400(polyether diols) as raw materials,a-NCO-end polyurethane(PU) prepolymer,which could be used as main agent of laminating adhesive,was synthesized.Finally,a two-components PU laminating adhesive without solvent was prepared by mixing between main agent and curing agent according to certain proportion.The research results showed that the main agent had the relatively optimal viscosity and liquidity when reaction temperature was 45 ℃,reaction time was 3 h and mass fraction of-NCO was 18%.The laminating adhesive had the relatively best bonding property,and bonding properties between laminating adhesive and like import product were adjacent when molar ratio of n(-NCO)∶n(-OH) was 1.9∶1 in two-components,curing temperature and time were 50 ℃ and 24 h respectively,and mass fraction of castor oil was 28.3%.