Study on Waterborne UV-Curable Polyurethane Acrylate Clearcoat and Its performance Based on Nano ZnO as Photoinitiator

doi:10.12020/j.issn.0253-4312.2019.7.1

Abstract

Abstract: In order to eliminate the small molecular fragments generated by organicphotoinitiators during photolysis，nano zinc oxide was prepared and waterborne polyurethaneacrylates was synthesized. Nano zinc oxide with a certain weight percentage was used as aninorganic photoinitiator for waterborne UV-curable coatings. The nano zinc oxide and UV-curedfilms of waterborne UV-curable coatings were analyzed by infrared spectroscopy，ultraviolet spectroscopy，X-ray diffraction，Malvern particle size analyzer，Zeta potential，transmission electron microscopy，thermogravimetric analysis，and scanning electron microscopy，respectively. Themechanical and physical properties of the paint film were also tested. When the content of nano-zinc oxide is 1%，the UV-cured film provided a hardness of H，adhesion of grade 0，gloss of about 90，and good water resistance，alkali resistance and excellent ethanol resistance. It was demonstrated that nano zinc oxide could be used as an alternative photoinitiator to organicphotoinitiators for waterborne UV-curable polyurethane acrylates，making the waterborne UV-curable coatings more environmental friendly and better quality.

Key words: nano zinc oxide, polyurethane acrylates, waterborne UV-curable coatings, photoinitiator

摘要： 为了消除有机光引发剂在光解时产生的小分子污染物，制备了纳米氧化锌，并合成了水性聚氨酯丙烯酸酯，按照一定的比例，将纳米氧化锌作为光引发剂，制得无机纳米光引发剂引发的水性光固化涂料。采用红外光谱仪、紫外可见分光光度计、 X-射线衍射仪、马尔文粒度仪、透射电子显
微镜、热重分析仪、扫描电子显微镜等测试分析了纳米氧化锌与水性光固化聚氨酯丙烯酸酯的漆膜；同时研究了漆膜的物理性能，当纳米氧化锌的添加量为 1%时，光固化漆膜的硬度为 H、附着力为 0级、光泽为 90左右、耐水性良好、耐碱性能好、耐醇性优良。表明纳米氧化锌可以代替有机光引发剂，用于水性光固化聚氨酯丙烯酸酯，从而合成出更环保、更优良的水性光固化涂料。

关键词: 纳米氧化锌, 聚氨酯丙烯酸酯, 水性光固化涂料, 光引发剂

CLC Number:

TQ637. 83

Feng Qin, Feng Jun, Ye Daiyong. Study on Waterborne UV-Curable Polyurethane Acrylate Clearcoat and Its performance Based on Nano ZnO as Photoinitiator[J]. Paint & Coatings Industry, 2019, 49(7): 1-7.

冯钦, 冯俊, 叶代勇. 纳米氧化锌为光引发剂的水性光固化聚氨酯丙烯酸酯清漆及漆膜性能的研究[J]. 涂料工业, 2019, 49(7): 1-7.

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https://www.cn-pci.com/EN/Y2019/V49/I7/1

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