预聚体对无溶剂聚氨酯胶黏剂耐蒸煮性能的影响  

Effects of Prepolymer on the Cooking-resistant Properties of Solventfree Polyurethane Adhesives

作　　者：姚家昌 陈志国 岳航勃[1] Yao Jia-chang;Chen Zhi-guo;Yue Hang-bo(School of Chemical Engineering and Light Industry,Guangdong University of Technology,Guangzhou 510006,China;Zhongshan Kingho Chemical Co.,Ltd.,Zhongshan 528478,China)

机构地区：[1]广东工业大学轻工化工学院,广东广州510006 [2]中山市康和化工有限公司,广东中山528478

出　　处：《广东工业大学学报》2024年第3期54-61,共8页Journal of Guangdong University of Technology

基　　金：广东省自然科学基金资助项目(2022A 1515011500);校企横向项目(22HK0258)。

摘　　要：本文合成了系列聚氨酯预聚体,将其用于制备双组分无溶剂聚氨酯胶黏剂,并利用红外光谱和核磁共振波谱证明预聚体和胶黏剂的结构。通过控制变量法研究了聚氨酯预聚体的异氰酸酯基质量分数(ω_(NCO))、多元醇分子量、R值(胶黏剂中-OH和-NCO基团的摩尔比)对胶黏剂黏度和耐蒸煮性能的影响。结果表明,在ω_(NCO)为17%时,预聚体黏度较低,聚氨酯胶黏剂经水煮后的剥离力较高。当ω_(NCO)一定时,随着多元醇分子量减小,预聚体黏度增大,聚氨酯胶黏剂水煮前后的剥离力增加。在多元醇分子量为1 609 g/mol,ω_(NCO)为17%,R值为2.5时,水煮前后耐蒸煮聚丙烯流延膜层剥离力最高分别达到6.30 N和4.37 N。将该预聚体与多种B组分混合获得一系列聚氨酯胶黏剂,均满足国家标准GB/T 41168-2021对铝塑复合膜耐蒸煮性能的需求。A series of polyurethane prepolymers were designed and synthesized as isocyanate-terminated component for the final product:two-component solvent-free polyurethane adhesives.Structural characterization using infrared and 1H NMR spectroscopies confirmed the structure of the designed prepolymers.The effect of the isocyanate mass fraction(ω_(NCO)) of the prepolymer,molecular weight of polyols and ratio R(molar ratio of -OH to-NCO in adhesives) on viscosity and cooking resistance of the polyurethane adhesives were investigated by a variable-control method.The results show that in the case of ω_(NCO)=17%,the prepolymer has a low viscosity,and the prepared adhesive has a higher peel force after boiling treatment.For a constant value of ω_(NCO),as the molecular weight of the polyol decreases,the viscosity of the prepolymer increases,so does the peel force of the polyurethane adhesive before and after boiling.With polyols molecular weight of 1 609 g/mol,ω_(NCO) of 17% and R of 2.5,the peel force of retort cast polypropylene(RCPP) layer before and after boiling is as high as 6.30 N and 4.37 N,respectively.A series of polyurethane adhesives were prepared by mixing this prepolymer with different B components,meeting the requirements in standard GB/T41168-2021 for cooking resistance requirements of aluminum plastic composite film.

关 键 词：胶黏剂 聚氨酯预聚体 异氰酸酯 分子量 剥离力 

分 类 号：TQ323.8[化学工程—合成树脂塑料工业]