复合薄膜用双组分水性聚氨酯胶黏剂的制备和性能

Preparation and properties of two-component waterborne polyurethane adhesives for laminated plastics films

制备了复合薄膜用双组分水性聚氨酯胶黏剂,初步研究了两种外加型交联剂环氧树脂6360、三聚氰胺-甲醛树脂对胶黏剂性能的影响。红外谱图和差示扫描量热法分析的结果表明在双组分水性聚氨酯胶黏剂中水性聚氨酯和交联剂发生了交联反应。外加交联剂可增加水性聚氨酯胶黏剂的交联度和黏度,从而有效提高胶黏剂的T型剥离强度和耐溶剂性能。环氧树脂较佳加入量在5%左右而三聚氰胺-甲醛树脂约为10%。由双组分水性聚氨酯胶黏剂黏合的PET/PE薄膜在较高温度下适当处理一段时间,其黏合效果更佳。

Two-component waterborne polyurethane （PU） adhesives for laminated plastics films were prepared and characterized with PTIR and DSC, and the effect of two types of crosslinking agents epoxy resin 6360 and melamine-formaldehyde resin on the properties of the adhesives was investigated. The results indicated that the crosslinking agents could react with waterborne polyurethane, which was confirmed by PTIR and DSC. The addition of the crosslinking agents increased the crosslinking ability and viscosity of the polyurethane adhesive, therefore strengthening T-style peel strength of the adhesives between polyethylene terephthalate （PET） and polyethylene （PE） film, and reducing the solubility of PU films in toluene. The optimized content of epoxy resin 6360 in the system was about 5 （wt%） while the optimized of content of melamine-formaldehyde resin was about 10 （wt%） . Good appearance and excellent adhesion performance of the laminated PET/PE films by PU adhesives would be achieved when the films were treated at a mild temperature for an appropriate time.