大豆油-油酸多元醇改性聚氨酯胶黏剂及其性能研究

Synthesis and Properties of Soybean Oil-Oleic Acid Based Polyols Modified Polyurethane Adhesive

摘要:

以环氧大豆油（ESBO）、油酸（OA）为主要原料，在无溶剂无催化剂的条件下合成了环氧大豆油-油酸多元醇（P-OA-ESBO），通过红外（FT-IR）和核磁（1H-NMR）对环氧大豆油-油酸多元醇（P-OA-ESBO）的结构进行了表征。然后以P-OA-ESBO、异氟尔酮二异氰酸酯（IPDI）、甘油为主要原料在无催化剂条件下合成了环保型包装用聚氨酯胶黏剂。利用热重分析（TGA）、差示扫描量热法（DSC）、拉伸力学性能测试、PE/OPP复合膜的剥离强度测试及剪切强度测试考察了不同R（NCO/OH）比聚氨酯胶黏剂涂膜的耐热、机械和粘接性能。结果表明：大豆油-油酸多元醇成功改性聚氨酯胶黏剂，相比于传统的大豆油基多元醇改性聚氨酯，该方法更为绿色经济环保，且当R值为1.3-1.5时合成的聚氨酯胶黏剂的力学拉伸和剪切能较好，R值在1.7时合成的聚氨酯胶黏剂剥离强度较优异，可满足PE/OPP膜的基本复合要求。

Abstract:

Bio-based polyols (P-OA-ESBO) from epoxidized soybean oil (ESBO) and oleic acid (OA) were developed using an environmentally friendly, solvent-free/catalyst-free method. The structure of P-OA-ESBO was characterized by FT-IR and 1H-NMR. Subsequently, environmental wrapping polyurethane adhesive was mainly prepared from P-OA-ESBO, isophorone diisocyanate (IPDI) and glycerin without catalysts. The polyurethane adhesives film were synthesised by different NCO/OH ratio (R value) were studied by TGA, DSC, tensile mechanical properties test, PE/OPP composite membrane peel strength test and shear strength test. Tensile mechanical properties test and shear strength test show that the more suitable NCO/OH ratio (R value) was 1.3-1.5. And when the R value was 1.7, the polyurethane adhesives from P-OA-ESBO have the best stripping resistance. Moreover, the synthetic route facilitate a more environmentally friendly and economical process than conventional soybean-based polyols used for polyurethane.