聚氨酯-环氧双重改性丙烯酸酯乳液及其压敏胶的研究

以不饱和 C C 键封端的聚氨酯预聚体(PU)和环氧树脂来改性丙烯酸酯,通过两步接枝共聚合成聚氨酯-环氧复合改性的丙烯酸酯(PUEA)水性压敏胶(PSA)。 通过差示扫描量热(DSC)和透射电镜(TEM)分析发现,改性后的共聚物为一均相体系,组分间未发生相分离。 研究了 PU 加入量和聚合工艺对乳液性能的影响,结果表明,改性后 PUEA 的粘接性、耐高温性有明显提高,当 PU 加入量为 6% 时 PSA 乳液的综合性能较佳;采用化学共聚所得共聚物比物理共混所得乳液的稳定性、粘接性和耐高温性有显著提高。

Polyurethane-epoxy Modified Acrylate Emulsion and Its Pressure Sensitive Adhesive

Polyurethane-epoxy-acrylate copolymers (PUEA) used as waterborne pressure-sensitive adhesives (PSA) were synthesized by a two-step copolymerization of acrylates with unsaturated double bound terminated polyurethane (PU) and epoxy resin. DSC and TEM analysis indicated that the modified copolymer was a homogeneous system and there was no phase-separation between the components. The effects of additions of PU and polymerization processes on PUEA emulsion properties and adhesion performances were also studied. The experimental results showed that the pressure sensitive performances and high temperature resistance of modified PUEA were greatly improved. When the content of PU was 6% , the properties of PUA emulsion were good. The stability, adhesion performance, and temperature resistance of the emulsions by chemical copolymerization were better than those of physical blending.