功能单体改性聚氨酯丙烯酸酯的制备及粘接性能

Preparation and Adhesive Properties of Polyurethane/polyacrylate Emulsions Modified with Functional Monomer

摘要:

以异佛尔酮二异氰酸酯(IPDI)、磺酸型聚酯二元醇(SDNP)为原料，以季戊四醇三丙烯酸酯（PETA）为羟基功能单体，采用无皂乳液聚合法制备了磺酸型聚氨酯丙烯酸酯乳液（SPUEA）。采用粒径分析仪、热重分析仪、力学性能测试和原子力显微镜（AFM）考察了不同w（PETA）对乳液及胶膜性能的影响。结果表明：随着w（PETA）从0.5%增至2%，乳液的粒径从87nm增至112nm，胶膜的拉伸强度从8.2MPa增至11MPa；随着w（PETA）从1%增至2%，热失重为50%时胶膜的分解温度从314.57℃升至330.57℃，AFM分析表明两相相容性良好；在w（PETA）=2%时，胶膜的交联度为84.57%，吸水率为8%，胶膜的综合性能较佳。将SPUEA乳液作为胶粘剂应用后，随着w（PETA）从0.5%增加至2%，T-型剥离强度从6.98N/mm增至11.23 N/mm，且乳液在PVC基材表面润湿性良好。

Abstract:

Novel eco-friendly sulfonated polyurethane/polyacrylate (SPUA) emulsions were synthesized by in situ soap-free emulsion polymerization method using isophorone diisocyanate (IPDI) and sodium sulfonate modified polyester polyol (SDNP) as raw materials and pentaerythritol triacrylate (PETA) with hydroxy and vinyl groups as fictional monomer. The effect of different w(PETA) on properties and morphology of the SPUEA emulsions and films were characterized by dynamic light scattering (DLS),thermo gravimetric analysis (TGA), mechanical properties and atomic force microscope (AFM). The results show that with the w(PETA) increased from 0.5% to 2%, the particle distribution become wider and the particle size increased from 87nm to 112nm, the tensile strength increased from 8.2MPa to 11MPa. With the w(PETA) increased from 1% to 2%, the half decomposition temperature increased from 314.57℃ to 330.57℃. The AFM results demonstrated that the compatibility between the two phased was also enhanced. When the w(PETA) was 2%, the gel content was 84.57%, and water absorption was 8%, the comprehensive performance of the SPUEA film was better. The SPUEA could be used as adhesives. The T-peel strength increased from 6.98N/mm to 11.23N/mm when the PETA mass fraction was up to 2%, and the emulsions could wet the PVC surface well.