环氧树脂蓖麻油双重改性水性聚氨酯皮革涂饰剂的合成与性能

Synthesis and Properties of Waterborne Polyurethane Modified with Epoxy Resin and Castor Oil for Leather Finishing Agent

摘要:

以聚氧化丙烯二醇（PPG）和异佛尔酮二异氰酸酯（IPDI）为原料，蓖麻油（CO）和环氧树脂（E-44）为交联剂，采用预聚体分散法合成了一系列用于皮革涂饰的环氧树脂蓖麻油双重改性水性聚氨酯（ECOWPU）。采用FTIR、TEM、DSC、TGA对聚合物结构及膜的性能进行了分析。FTIR表明聚合物中引入了蓖麻油和环氧树脂，羟基和环氧基均参与反应。通过TEM可观察乳液颗粒呈球形，粒径较为均匀。DSC表明，改性后胶膜的微相分离程度增大。TGA表明，环氧树脂和蓖麻油的加入提高了聚氨酯的热稳定性。蓖麻油、E-44含量的增加，均使胶膜拉伸强度逐渐增大，断裂伸长率、吸水率降低。

Abstract:

A series of stable waterborne polyurethane for leather finishing modified with epoxy resin and castor oil (ECOWPU) were prepared by the prepolymer process using polypropylene glycol (PPG) and isophorone diisocyanate (IPDI), with castor oil (CO) and epoxy resin(E-44) as the coupling agent. The structure of the polymer and the properties of the resulting films were analyzed by FTIR, TEM, DSC and TGA. FTIR showed that castor oil and epoxy resin were chemically incorporated into the copolymer. Both hydroxyl groups and epoxy groups of epoxy resin participated in the reaction. TEM showed that the particle morphology was spherical, and the particle size was relatively uniform. DSC indicated that the degree of micro-phase separation in the modified films increased. TGA revealed that the thermal properties were better when castor oil and epoxy resin were incorporated. With increase of the content of castor oil and E-44, the tensile strength increased asymptotically, and the elongation at break and the water absorption decreased.