Photopolymerization kinetics of UV-curable polyester powder coatings containing urethane methacrylate reactive diluents

IF 2.8 4区材料科学 Q2 CHEMISTRY, APPLIED

Journal of Coatings Technology and Research Pub Date : 2025-05-09 DOI:10.1007/s11998-025-01079-7

Theodore J. Hammer, Coleen Pugh, Mark D. Soucek

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Abstract

A series of small molecule urethane methacrylates were synthesized and used as reactive diluents for UV-curable polyester powder coatings. A UV-curable polyester oligomer was prepared and formulated with the reactive diluents and a photoinitiator package. Kinetics studies were carried out using photo-differential scanning calorimetry (photo-DSC). The influence that the reactive diluent concentration, UV-light intensity, temperature, and atmosphere had on the reaction kinetics was investigated. Crosslinked samples that were analyzed via DSC showed that the glass transition temperature correlated well with the extent of conversion. In general, lower curing temperatures (i.e., ≤ 80°C) significantly reduced the conversion and polymerization rate. However, the use of a mono-functional reactive diluent facilitated much higher conversions than the UV-curable polyester control, even at just 5 wt% loading level. These findings suggest that reactive diluents can be used to improve the low temperature cure capability of UV-curable polyester powder coatings.

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含甲基丙烯酸氨基甲酸酯反应稀释剂的光固化聚酯粉末涂料的光聚合动力学

合成了一系列小分子甲基丙烯酸氨基甲酸乙酯，并将其用作光固化聚酯粉末涂料的活性稀释剂。用活性稀释剂和光引发剂包体制备了一种紫外光固化聚酯低聚物。动力学研究采用光差扫描量热法（photo-DSC）进行。考察了反应稀释剂浓度、紫外光强度、温度和气氛对反应动力学的影响。通过DSC对交联样品进行分析表明，玻璃化转变温度与转化程度密切相关。一般来说，较低的固化温度（即≤80℃）会显著降低转化和聚合速率。然而，单功能反应稀释剂的使用比紫外光固化聚酯控制组的转化率高得多，即使负载水平只有5 wt%。研究结果表明，活性稀释剂可用于提高紫外光固化聚酯粉末涂料的低温固化性能。

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来源期刊

Journal of Coatings Technology and Research 工程技术-材料科学：膜

CiteScore

4.30

自引率

8.70%

发文量

130

审稿时长

2.5 months

期刊介绍： Journal of Coatings Technology and Research (JCTR) is a forum for the exchange of research, experience, knowledge and ideas among those with a professional interest in the science, technology and manufacture of functional, protective and decorative coatings including paints, inks and related coatings and their raw materials, and similar topics.