摘要： 以 2，4－甲苯二异氰酸酯（ TDI）、聚氧化丙烯二醇（ PPG-1000）、季戊四醇三丙烯酸酯（PETA）为主要原料合成了聚氨酯丙烯酸酯（PUA），与适量三羟甲基丙烷三甲基丙烯酸酯（TMPTMA）复合制备了辐照固化 PUA 涂料，采用 FT-IR 对 PUA 结构进行表征；考察了R 值（—NCO与—OH的物质的量比）和辐射固化方式对涂膜的耐溶剂性、附着力、铅笔硬度、热性能等的影响。 结果表明经⁶⁰Co γ 射线辐射固化的涂膜比 UV 固化的涂膜有更好的耐溶剂性和附着力，但硬度不如 UV 固化得到的涂膜，涂膜热稳定性好，且随 R 值增大而提高。 当 R 值为 1.8，制备出的 PUA 树脂经⁶⁰Co γ 射线辐射固化得到的涂膜具有良好的综合性能。

关键词: γ 射线, UV 固化, 聚氨酯丙烯酸酯, 热稳定性

Abstract: A polyurethane acrylate (PUA)prepolymer based on 2,4-toluene diisocyanate(TDI), poly(propylene glycol)(PPG-1000)and pentaerythritol triacrylate (PETA) was prepared, and mixed with trimethylolpropane trimethacrylate(TMPTMA )to give the radiation curable PUA coatings. The structure of PUA was characterized by FT-IR. The effects of -NCO/-OH ratio (R) and radiation curing type on the solvent resistance, adhesion, hardness and thermal performance of PUA film were studied. The result showed that the PUA film ⁶⁰Co γ radiation gave stronger adhesion better solvent resistance and thermal cured by stability but lower hardness than the film cured by UV. Furthermore, the thermal stability of the film cured by ⁶⁰Co γ radiation increased with the increase of R. When R was 1.8, the  ⁶⁰Co γ radiation-cured PUA film showed excellent comprehensive performance.

Key words: y radiation, UV-cure, polyurethane-acrylate, thermal stability