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作 者:林星[1] 胡佳[1] 蔡海元[1] 崔爱玲[1] 林中祥[1]
机构地区:[1]南京林业大学化学工程学院,江苏南京210037
出 处:《中国胶粘剂》2012年第12期25-28,32,共5页China Adhesives
基 金:江苏高校优势学科建设工程资助项目
摘 要:以聚酯多元醇、混合异氰酸酯(MDI/TDI)、扩链剂(1,2-丙二醇)、异氰酸酯固化剂(TMP-TDI)和溶剂(乙酸乙酯)等为主要原料,制备了PP(聚丙烯)、PE(聚乙烯)粘接用双组分PU(聚氨酯)胶粘剂。研究结果表明:当m(结晶性聚酯多元醇):m(非结晶性聚酯多元醇)=80:20~60:40、R=n(-NCO)/n(-OH)=0.95~0.97、m(MDI):m(TDI)=90:10~60:40和W(功能性聚酯多元醇XCP-2325)=2%时,PU预聚体的相对分子质量为(9-11)×104,其常温固化12h后的邵A硬度(76)有利于PU预聚体的破碎;当PU预聚体/乙酸乙酯溶液的固含量为12%时,双组分PU胶粘剂的操作性能(黏度为22mPa·s)、180°剥离强度(初始2.3N/25mm、最终41.0N/25mm)俱佳。With polyester polyol, hybrid isocyanate ( MDI/TDI ), chain extender ( 1,2 -propylene glycol ), isocyanate curing agent (TMP-TDI) and solvent ( ethyl acetate ) as main raw materials, a two-components PU (polyurethane) adhesive for bonding polypropylene (PP) and polyethylene (PE) was prepared. The research results showed that the molecular weight of PU prepolymer was(9-11 ×104,its Shao A hardness (76) after room temperature curing 12 h was favorable for fragmentation of PU prepolymers when mass fractions of m (crystalline polyester polyol) :m (noncrystalline polyester polyol ) and m (MDI) :m (TDI) were 80:20-60:40 and 90:10-60:40 respectively,R value or molar ratio of n (-NCO)/n(-OH) was 0.95-0.97 ,and mass fraction of functional polyester polyol(XCP-2325) was 2%. The two-components PU adhesive had both good operation properties (viscosity at 22 mPa.s) and good 180° peeling strength (initial peeling strength at 2.3 N/25 mm,and final peeling strength at 41.0 N/25 mm) when solid content of PU prepolymers/ethyl acetate solution was 12%.
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