光固化聚氨酯-丙烯酸酯乳液的制备及对纸张的增强作用

Preparation of UV curable polyurethane-acrylate emulsion and its strengthening effect for paper

以异佛尔酮二异氰酸酯(IPDI)、聚己内酯二元醇(PCL1000)、二羟甲基丁酸(DMBA)、季戊四醇三丙烯酸酯(PETA)和丙酮等为原料合成了水性光固化聚氨酯-丙烯酸酯复合乳液,并利用该乳液对纸张进行表面施胶。通过傅立叶红外光谱(FT-IR)和光散射对乳液的结构进行了分析;研究了n(NCO)/n(OH)比值(R值)对乳液和涂膜耐水性和力学性能的影响,紫外光(UV)固化前后对纸张物理性能的影响。结果表明,当n(NCO)/n(OH)=1.6,m(PETA)=12.6%时,乳液具有良好的稳定性,涂膜呈现良好的耐水性和力学强度,吸水率降至3.66%;UV固化后纸张湿强度提高41.65%,纸张环压指数达到5.25N.m/g。

Waterborne UV curable polyurethane-acrylate emulsion was prepared with isophorone diisocyanate （IPDI）, polycaprolactone diols （PCL1000）, 2,2-dimethylolbuty ricacid （DMBA）, pentaerythritol triacrylate （PETA） and acetone as raw materials. And the emulsions were utilized for paper surface sizing. Fourier trans- form infrared spectrometer （FT-IR） and light scattering were used to analyze the structure of emulsion; effects of n（NCO）/n（OH）（R value） on the emulsion properties were systematically studied , as well as the water re- sistance and mechanical property of corresponding films. In addition, effects of UV curing on paper physical properties were discussed. The results showed that the emulsions were stable and the films displayed good wa- ter resistance and mechanical property, the water absorption decreased to 3.66% when n （NCO）/n （OH）=1.6, m（PETA）=12.6%. After UV curing, the wet strength of paper increased to 41.65%, and the ring crush in- dex of paper reached 5.25N· m/g.