Krasowska Małgorzata, Kowalczyk Agnieszka, Kowalczyk Krzysztof, Oliwa Rafał, Oleksy Mariusz
Department of Polymer Composites, Faculty of Chemistry, Rzeszow University of Technology, Al. Powstańców Warszawy 12, 35-959 Rzeszów, Poland.
INSTBUD Sp. z o.o., ul. Przemysłowa 3, 32-420 Gdów, Poland.
Materials (Basel). 2025 May 15;18(10):2304. doi: 10.3390/ma18102304.
Cured-in-place pipe (CIPP) technology is a trenchless rehabilitation method for damaged pipelines in which a resin-saturated liner (often a fiber-reinforced type) is inserted into a host pipe and cured in situ, typically using a UV light beam or steam. This study investigates the influence of selected photoreactive diluents on the photopolymerization process of a styrene-free vinyl ester resin designed for the CIPP applications by evaluating the rheological properties, photopolymerization kinetics (photo-DSC), thermal characteristics (DSC), crosslinking density (gel content), and mechanical properties of thick (15 mm) UV-cured layers. The tested diluents included monofunctional (i.e., methyl methacrylate and vinyl neodecanoate), difunctional (1,6-hexanediol diacrylate, aliphatic urethane acrylates, and an epoxy acrylate), and trifunctional monomers (trimethylolpropane triacrylate, pentaerythritol triacrylate, and trimethylolpropane ethoxylate triacrylate). The key findings demonstrate that the addition of pentaerythritol triacrylate (the most attractive diluent) increases the flexural strength (+6%) and deflection at strength (+28%) at the unchanged flexural modulus value (ca. 2.1 GPa). The difunctional epoxy acrylate caused an even greater increase in the deflection (+52%, at a 5% increase in the flexural strength).
原位固化管道（CIPP）技术是一种用于修复受损管道的非开挖修复方法，该方法是将饱和树脂内衬（通常为纤维增强型）插入主管中并进行原位固化，通常使用紫外线光束或蒸汽。本研究通过评估流变性能、光聚合动力学（光差示扫描量热法）、热特性（差示扫描量热法）、交联密度（凝胶含量）以及厚（15毫米）紫外线固化层的机械性能，研究了所选光反应性稀释剂对一种专为CIPP应用设计的无苯乙烯乙烯基酯树脂光聚合过程的影响。测试的稀释剂包括单官能（即甲基丙烯酸甲酯和新癸酸乙烯酯）、双官能（1,6 - 己二醇二丙烯酸酯、脂肪族聚氨酯丙烯酸酯和环氧丙烯酸酯）和三官能单体（三羟甲基丙烷三丙烯酸酯、季戊四醇三丙烯酸酯和三羟甲基丙烷乙氧基化物三丙烯酸酯）。关键研究结果表明，添加季戊四醇三丙烯酸酯（最具吸引力的稀释剂）在弯曲模量值不变（约2.1吉帕）的情况下，可提高弯曲强度（+6%）和强度下的挠度（+28%）。双官能环氧丙烯酸酯使挠度增加得更多（+52%，弯曲强度增加5%）。
