非结晶性水性聚氨酯油墨连接料的合成

以端羟基聚丁二烯(HTPB)、聚己二酸新戊二醇酯(PNA)、异佛尔酮二异氰酸酯(IPDI)为主要原料制备了一系列水性聚氨酯乳液.采用FTIR、XRD、SEM对胶膜的结构及形貌进行了表征,对乳液性能、胶膜的吸水率、力学性能及胶膜在双向拉伸聚丙烯(BOPP)薄膜上的剥离强度进行了测试,通过胶膜与水、乙二醇、二碘甲烷的接触角测试计算了胶膜的表面能.结果表明,随着HTPB含量的增加,乳液粒径逐渐增大、胶膜表面能大致呈逐渐减小趋势.当HTPB含量为PNA物质的量的30％时,水性聚氨酯乳液综合性能最好,平均粒径为287.3 nm,胶膜表面能为31.77 mJ/m2,拉伸强度为14.20 MPa,断裂伸长率为977.72％,在BOPP薄膜上的剥离强度为4.4 N/25 mm.以该乳液配制的油墨满足GB/T 26394—2011《水性薄膜凹印复合油墨》对油墨黏度13～50 s的要求,且具有良好的初干性和抗粘连性,可满足日常使用.

Synthesis of amorphous waterborne polyurethane ink binder

Waterborne polyurethane was prepared by terminal-hydroxypolybutadiene (HTPB) and poly (neopentyl glycol adipate) (PNA) as soft segments. The structure of as-prepared waterborne polyurethane was characterized by FTIR, XRD and SEM. The mechanical performance of the polyurethane was investigated by peel strength test on the biaxially oriented polypropylene (BOPP) film. The results show that the particle size of the emulsion gradually increased with the molar content of HTPB increased. The surface energy gradually decreased, then kept stable with the molar content of HTPB increased. The best comprehensive performance of the polyurethane was obtained when the molar content of HTPB was 30% of PNA. The average particle size of the polyurethane emulsion was 287.3 nm and the surface energy of the film was 31.77 mJ/m2. The tensile strength of the film was 14.2 MPa and the elongation at break was 977.72%. The peel strength of the polyurethane on the BOPP film was 4.4 N/25mm.