自然光固化水性聚氨酯树脂的制备与性能
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摘要
合成了可自然光固化的季戊四醇三丙烯酸酯(PETA)和甲基丙烯酸羟乙酯(HEMA)混合封端型水性聚氨酯树脂。研究了PETA和HEMA的摩尔比(n1∶n2)对聚氨酯膜的硬度、耐溶剂性、凝胶含量和力学性能的影响,以及光引发剂种类和用量对固化速率的影响。结果表明,随着PETA在混合封端剂中含量的增大,聚氨酯膜的分子结构由线性转变为交联结构,漆膜的凝胶率、拉伸强度和模量逐渐增加,断裂伸长率降低。当n1∶n2为4∶6时,聚氨酯膜表现出最佳的耐溶剂性;复配型光引发剂的质量分数为2%时,在自然光照射下,树脂固化时间最短。
Natural light curable water based polyurethane dispersions terminated by the mixture of pentaerythritol triacrylate( PETA) and methacrylate( HEMA) were synthesized. The effect of the molar ratio( n1∶ n2) of PETA and HEMA on the hardness,solvent resistance,gel content and mechanical properties of the films was researched. The effects of photo initiators and content on the curing time of the polyurethane films were investigated respectively. The results showed that,with an increase of PETA content in the mixed end-capping reagents,the molecule structure of polyurethane films was transformed from the linear to the crosslinking structure and the gel content,tensile strength and modulus of the PU films were increased gradually,while the elongation at break was decreased. The polyurethane film exhibited the best solvent resistance when n1∶ n2 was 4 ∶ 6. When the mass fraction of the complex initiator was 2%,the curing time for PU dispersion was the shortest under natural light.
Natural light curable water based polyurethane dispersions terminated by the mixture of pentaerythritol triacrylate( PETA) and methacrylate( HEMA) were synthesized. The effect of the molar ratio( n1∶ n2) of PETA and HEMA on the hardness,solvent resistance,gel content and mechanical properties of the films was researched. The effects of photo initiators and content on the curing time of the polyurethane films were investigated respectively. The results showed that,with an increase of PETA content in the mixed end-capping reagents,the molecule structure of polyurethane films was transformed from the linear to the crosslinking structure and the gel content,tensile strength and modulus of the PU films were increased gradually,while the elongation at break was decreased. The polyurethane film exhibited the best solvent resistance when n1∶ n2 was 4 ∶ 6. When the mass fraction of the complex initiator was 2%,the curing time for PU dispersion was the shortest under natural light.
引文
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[4]陈立来,张胜文,王亚东,等.聚醚软段对光固化水性聚氨酯纳米复合乳液性能的影响[J].聚氨酯工业,2015,30(2):25-28.
[5]潘祖仁.高分子化学[M]. 4版.北京:化学工业出版社,2007:74.
[6]韩俊凤,卢双,王正平.光引发剂对自由基型UV固化反应的影响[J].应用科技,2006,33(4):57-59.
[7]沈效峰,郁建华.光交联型水性聚氨酯乳液的研究[J].聚氨酯工业,1998(2):9-12.
[8]訾少宝.水性聚氨酯树脂的合成与改性研究[D].青岛:青岛科技大学,2007.
[9]张大雷,栾明玥,林权,等.两种不同粒径的SBR粒子对透明ABS树脂力学性能影响[J].高分子学报,2006(2):356-360.
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