| 摘要: |
| 目的 研究双键含量可调的紫外光固化水性聚氨酯乳液及其涂膜性能。方法 通过直接酯化法制备季戊四醇二丙烯酸酯（PEDA）， 并以其为功能性扩链剂与甲苯二异氰酸酯（TDI）、 聚酯二元醇（POL-756T）、 二羟甲基丙酸 （DMPA） 等原料制备一系列从侧基引入C＝C双键的水性聚氨酯乳液。分别研究不同含量的PEDA及DMPA对乳液及涂膜性能的影响。结果 PEDA含量的增加会使其涂膜拉伸强度增加， 断裂伸长率降低， 热稳定性随之增强； DMPA含量的增加会使乳液的稳定性增强， 颜色更加透明， 粒径变小， 但耐水性会降低。结论 当PEDA质量分数为6.1%， DMPA为8.3%时， UV固化水性聚氨酯乳液具有良好的外观、 稳定的性能， 且涂膜的耐水性和力学性能优异。 |
| 关键词: 紫外光固化 水性聚氨酯 性能 |
| DOI： |
| 分类号:TS206.4 |
| 基金项目: |
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| Properties of UV-Curable Waterborne Polyurethane Emulsion and Its Film Based on PEDA |
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WANG Zheng-xiang1, LI Yun-hua1, XIAO Xi-mei1, CHEN Hong2
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1.Hunan University of Technology， Zhuzhou 412007， China;2.Central South University of Forestry and Technology， Changsha 410004， China
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| Abstract: |
| This work aimed to study the UV-curable waterborne polyurethane emulsion with adjustable double bond content and its film properties. The pentaerythritol diacrylate (PEDA) was prepared via direct esterification, and used as a functional chain extender to synthesize a series of UV-curing waterborne polyurethane emulsion by introducing the C＝C bond into the side chain, with 2,4-tolylene diisocyanate (TDI), polyethylene glycol (POL-756T), dimethylol propinic acid (DMPA) as main materials. The effects of different PEDA and DMPA contents on the emulsion and film properties were studied. The increase of PEDA content could lead to the increase of film tensile strength and thermal stability while the decrease of elongation at break. The increase of DMPA content could lead to improved storage stability, increased transparence, finer particle size and decreased water resistance. When the PEDA content was 6.1% and the DMPA content was 8.3%, the WPU emulsion had good appearance and stability, and the coating film had excellent water resistance and mechanical property. |
| Key words: UV-curable waterborne polyurethane performance |
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