丙烯酸改性邻甲酚醛环氧树脂的制备及深层光固化行为

doi:10.12477/j.att.202411048

摘要/Abstract

摘要： 针对丙烯酸树脂在紫外光固化过程中存在的深层固化程度不足、热机械性能欠佳及附着力较差等问题,以邻甲酚醛环氧树脂和丙烯酸为原料,通过开环反应成功合成了一种新型光敏性邻甲酚醛环氧丙烯酸树脂(EOA)。以 EOA 作为主体树脂,系统研究了Ⅰ型引发剂 907 和Ⅱ型引发剂 ITX 对 EOA 固化膜表层及深层双键转化率、热力学性能、铅笔硬度和附着力的协同影响机制。结果表明:当引发剂 907 与 ITX 以 10∶1的比例复配且总质量分数为 4%时,EOA 光固化膜表现出优异的综合性能。其中,深层双键转化率达到76.2%,较单独使用 907 时提升了 22.1%;玻璃化转变温度(Tg)提升至 161.6℃,增幅达 9.1%;储能模量达到3259.5 MPa,提高了 21.1%。同时,固化膜的铅笔硬度达到 5 H,附着力为 0 级,各项性能指标均得到显著改善。研究结果可为开发高性能紫外光固化材料提供新的思路和方法。

关键词: 邻甲基酚醛环氧树脂, 紫外光固化, 深层固化, 光固化动力学

Abstract: Ultraviolet UV curing technology serves as a rapid curing method for liquid materials where UV-irradiated photocurable resins undergo rapid crosslinking polymerization to form solid materials with a three-dimensional crosslinking network. Compared to traditional thermal curing technology UV curing technology boasts notable advantages such as fast curing speed low energy consumption excellent gloss and hardness of the cured film strong environmental friendliness and a broad range of applications. Consequently it has found widespread use in fields such as coatings adhesives copper-clad laminates and electronic packaging. However during the UV curing process due to the absorption scattering and reflection of UV light by the surface layer the light intensity significantly diminishes in deeper layers resulting in insufficient crosslinking of the resin in these areas and thus compromising overall performance. Although UV-heat and UV-moisture dual-curing technologies can to some extent enhance the overall crosslinking degree of the resin both methods have inherent limitations UV-heat curing requires longer time and higher energy consumption and is unsuitable for heat-sensitive applications UV-moisture curing is constrained by longer curing times and dependence on ambient humidity. Therefore achieving efficient deep curing of resins solely through UV curing and enhancing overall performance has become a key area of research. To address issues such as low deep UV curing efficiency poor thermomechanical properties and weak adhesion in resin a photosensitive o-cresol novolac epoxy acrylate resin EOA was successfully synthesized using o-cresol novolac epoxy resin and acrylic acid as raw materials. This was achieved by introducing double bonds through the reaction between the carboxyl groups of acrylic acid and the epoxy groups. Using EOA as the main resin a systematic study was conducted on the effects of type I photoinitiator 907 type II photoinitiator ITX and their dosages on the double bond conversion rates in both the surface and deep layers of the EOA cured film. Fourier transform infrared spectroscopy FTIR was employed to analyze the photopolymerization kinetics of the surface and deep layers of the EOA cured film. Additionally key indicators such as the thermomechanical properties pencil hardness and adhesion of the EOA coating film were evaluated. The results showed that when the photoinitiators 907 and ITX were combined in a 10:1 ratio at a total dosage of 4 wt% the EOA cured film exhibited optimal comprehensive performance. Under these conditions the double bond conversion rates for the surface and deep layers of the EOA cured film were 96.5% and 76.2% respectively. The glass transition temperature Tg was 161.6℃ the storage modulus was 3259.5 MPa the coating film hardness was 5H and the adhesion was rated at grade 0. The EOA coating film prepared using the aforementioned method not only overcomes the shortcomings of traditional UV curing technology such as insufficient deep crosslinking and degraded overall performance but also significantly enhances the crosslinking degree thermodynamic properties and mechanical performance of the coating film. By optimizing the ratio and amount of photoinitiators this study achieves efficient deep curing of the resin solely through UV curing. Compared to traditional UV-heat or UV-moisture dual-curing processes this approach offers notable advantages including ease of operation high efficiency and strong environmental friendliness.

Key words: o-cresol novolac epoxy resin, UV curing, deep curing, photocuring kinetics

中图分类号:

TQ323.5

王伟, 余林潘, 李忠安, 翟世民, 戚栋明, 汪继承. 丙烯酸改性邻甲酚醛环氧树脂的制备及深层光固化行为[J]. 现代纺织技术, 2025, 33(10): 37-48.

WANG Wei, YU Linpan, LI Zhongan, ZHAI Shimin, QI Dongming, WANG Jicheng. Preparation of acrylic-modified o-cresol novolac epoxy resin and its deep photocuring behavior[J]. Advanced Textile Technology, 2025, 33(10): 37-48.

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