非结晶性水性聚氨酯油墨连接料的合成

Synthesis of amorphous waterborne polyurethane ink binder

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/m^(2),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。

A series of waterborne polyurethane emulsions were prepared using hydroxyl-terminated polybutadiene(HTPB), poly(neopentyl glycol adipate) and isophorone diisocyanate as main raw materials.The structure and morphology of the films were characterized by FTIR, XRD and SEM. The properties of emulsion, water absorption, mechanical properties and peel strength of films on biaxial tensile polypropylene(BOPP) film were tested. The surface energy of the films was calculated by measuring the contact angle between the film and water, ethylene glycol and methane diiodide. The results showed that with the increase of HTPB content, the particle size of emulsion gradually increased, and the surface energy gradually decreased to unchanged. When the content of HTPB was 30% of the molar amount of substance of PNA, the prepared waterborne polyurethane emulsion had the best comprehensive performance, the average particle size was 287.3 nm, the surface energy was 31.77 m J/m;, the tensile strength was 14.20 MPa, the elongation at break was 977.72%, and the peel strength on BOPP film was 4.4 N/25 mm. The ink prepared by the emulsion met the requirements for ink viscosity of 13~50 s of GB/T 26394—2011 water-based gravure lamination ink for film, and had good initial drying and adhesion resistance, which could meet the daily use.