Robust UV-curable polyurethane acrylate coating
充满生机的耐紫外线固化聚氨酯丙烯酸酯涂料市场
During a new study, a UV-curable self-healing transparent polyurethane acrylate coating based on disulfide bonds and hardened the coating by modified nano-silica was designed. The study broadens the application of UV-curable coatings and is expected to address the problem of internal stress defects in UV-curable materials.
一项新的研究中, 研究人员通过改性纳米二氧化硅硬化了涂料,设计了一种基于二硫键的UV固化自愈合透明聚氨酯丙烯酸酯涂料.
该研究拓宽了uv固化涂料的应用领域,有望解决uv固化材料的内应力缺陷问题.
UV-curable coatings have been widely used because of their environmental friendliness and low emission of volatile organic compounds (VOCs). However, the fast curing-speed of UV-curable coatings often leads to internal structural defects, which greatly restricts its application and development. The coating prepared in the recent study shows 93 % scratch repair efficiency under UV light at 50 °C, and the coating has high hardness (4H). In addition, the coating exhibits good transparency (85 % transmittance in the visible region), which means that the coating can meet the requirements of the applications of transparency protective coating.
uv固化涂料因其环境友好、挥发性有机化合物(VOCs)排放低而得到广泛应用.然而,紫外光固化涂料由于固化速度快,往往会产生内部结构缺陷,极大地制约了其应用和发展.
本研究制备的涂层在50°C紫外光下的划痕修复效率为93%,涂层具有较高的硬度(4H).此外,该涂层具有良好的透明度(在可见光区域的透过率为85%),这意味着该涂层可以满足透明保护涂层的应用要求.
Broadened application of UV-curable coatings
拓宽了UV固化涂料的应用
The defect that blending inorganic particles will hinder the movement of molecular chain was overcome owing to the modified nano-silica (SiO2-KH570) is not simply mixed with the other components but grafted onto the chain. Therefore, the addition of SiO2-KH570 not only harden the coating, but also can reduce the glass transition temperature of the coating which is helpful for self-healing of the coating. Additionally, it was proven that the introduction of disulfide reversible bonds is helpful to eliminate internal stress of UV-curing materials by preheating process, in which the mechanical properties of the coating with disulfide bonds significantly improved (increased by at most 209 %). As the developers point out, their study broadens the application of UV-curable coatings and is expected to address the problem of internal stress defects in UV-curable materials.
由于改性的纳米二氧化硅(SiO2-KH570是)接枝到分子链上, 而不是简单地与其他组分混合,克服了无机颗粒混合会阻碍分子链运动的缺陷.
因此,SiO2-KH570的加入不仅能使涂层硬化,还能降低涂层的玻璃迁移温度,有利于涂层的自修复.
此外,引入可逆二硫键有助于消除UV固化材料预热过程中的内应力,使涂层的力学性能显著提高(最多提高209%).
研究人员指出,他们的研究拓宽了uv固化涂料的应用范围,并有望解决uv固化材料的内应力缺陷问题.
The study has been published in Progress in Organic Coatings, Volume 172, November 2022.
该研究已发表在《有机涂料进展》,第172卷,2022年11月.
图片来源:FreeProd - Fotolia
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