Jiaqi Su , Xuan Liu , Bo Wang , Tianyi Jin , Haoyuan Sun , Jinhui Wang , Kunxiang Xu , Zhenhua Gao , Shuangying Wei , Shuaiyuan Han
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引用次数: 0
Abstract
Benzophenone is a hydrogen-capturing small molecule photoinitiator and its migration in ultraviolet curing systems has been identified as a potential issue. In this study, soy protein isolate (SPI) was used as both the reactant and the hydrogen donor of the photoinitiator for free radical polymerization. Benzophenone-containing polyacrylate (PA) molecules were then grafted into SPI to achieve the self-initiation of the light-curing reaction. The SPI-benzophenone structure on the polymer chain formed a large-molecule photoinitiator system, in which bimolecular interactions occurred under UV irradiation to promote the low migration of the photoinitiator. A waterborne polyacrylate resin (PA-AHBP-SPI) suitable for wood coatings was prepared, and the detailed mechanism of reaction process was proposed. It was noticed that the PA-AHBP-SPI composite emulsion exhibited substantial UV absorption at 285 nm, with a maximum molar extinction coefficient of 27,387 L.mol−1.cm−1. The migration rate of the cured film was found to be only 17.68 % after 9 h of soaking in acetonitrile, and it demonstrated markedly low mobility. Under the optimal SPI content (4 g), the absorption of benzophenone photoinitiators is reduced three times to 29.74 %, the UV cure time of the film is reduced to 4.28 s and the tensile strength reaches 9.43 MPa.
期刊介绍:
The aim of this international journal is to analyse and publicise the progress and current state of knowledge in the field of organic coatings and related materials. The Editors and the Editorial Board members will solicit both review and research papers from academic and industrial scientists who are actively engaged in research and development or, in the case of review papers, have extensive experience in the subject to be reviewed. Unsolicited manuscripts will be accepted if they meet the journal''s requirements. The journal publishes papers dealing with such subjects as:
• Chemical, physical and technological properties of organic coatings and related materials
• Problems and methods of preparation, manufacture and application of these materials
• Performance, testing and analysis.