可聚合松香基紫外光固化涂层的合成和性能分析

以两种松香基单体———歧化松香(β-丙烯酰氧基乙基)酯(DREA)和丙烯酸松香(β-甲基丙烯酰氧基乙基)酯(AREA)为原料,通过紫外光固化的方式,合成基于松香的涂层,研究松香基单体配比和交联度对涂层硬度和附着力的影响。结果表明,松香基单体固化效率高,有助于提高聚合物涂层的硬度和储存模量(E’),但附着力差。在配方中加入丙烯酸-2-羟基乙基酯(HEA),可以改善涂层的附着力。涂层组成的最佳配比为:DREA 50%,AREA30%,其它辅助成分20%。     

Synthesis,characterization, and UV curing kinetics of hyperbranched polycarbosilane

Hyperbranched polycarbosilane with allyl end groups was synthesized via hydrosilylation of methyldiallyldilane, and characterized by Fourier transform infrared spectroscopy, ¹H, ¹³C, ²⁹Si nuclear magnetic resonance, and size exclusion chromatography/multiangle laser light scattering. The degree of branching and average number of branches of the resulted polymer determined by ²⁹Si NMR spectroscopy is 0.58 and 0.42, and the exponent α in Mark–Houwink equation is 0.33 based on the relationship between viscosity and molecular weight. UV curing behaviors of the hyperbranched polycarbosilane were investigated using differential scanning photocalorimeter, and the effects of diluent's concentration, light intensity, reaction atmosphere, and temperature on the curing behaviors and kinetics were studied in detail. It was found that curing reaction can be accomplished rapidly under UV irradiation within 40 s both in air and in nitrogen atmosphere if acrylic reactive diluent was employed. The result suggests that it is an effective way to increase the curing reactivity by incorporating acrylic reactive diluents with high UV sensitivity into the polycarbosilane system. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2008     

紫外光固化体系的研究进展

综述了紫外光固化体系,包括自由基紫外光固化体系、阳离子紫外光固化体系、自由基-阳离子混杂光固化体系和双重固化体系的研究进展。     

紫外光固化环氧豆油丙烯酸酯的制备与表征

将环氧大豆油与丙烯酸反应制备出环氧豆油丙烯酸酯预聚物,讨论了反应温度、反应时间、催化剂、阻聚剂的种类与用量对合成反应的影响,并用红外光谱对产物的结构进行了表征。研究结果表明其最佳反应条件是:催化剂三苯基膦,反应温度110℃,反应时间8h。该预聚树脂可用紫外光固化,其固化膜硬度达3H,且具有较好的柔韧性和附着力。     

Nanoheterogeneous networks by photopolymerization of perfluoropolyethers and acrylic co‐monomers

Perfluoropolyethers (PFPEs) functionalized with acrylic and methacrylic end groups can be mixed with typical hydrogenated acrylic monomers such as hexanediol diacrylate, tripropyleneglycol diacrylate and trimethylolpropane triacrylate. Mixtures are transparent up to 1:3 weight ratios and can then be photopolymerized. Crosslinked networks are obtained, showing a complex multiphasic nanostructure: submicrometric hydrogenated nanodomains are chemically linked to the fluorinated matrix. Because of this morphology, these networks show peculiar bulk and surface properties: the PFPE matrix ensures low surface energy and low refractive index, while the hydrogenated phase enhances the mechanical properties and polarity of the systems. The networks are then suitable for advanced applications in coatings, microelectronics and optical devices. © 2013 Society of Chemical Industry     

UV漆涂装

近年来，UV漆的发展十分迅速，均以二位数的速度增长，在塑料、地板、电子、印刷等众多领域得到应用。UV漆的涂装有其自身的特点，我们通过相当一段时间的学习、摸索、试验，获得了一些经验。     

混杂紫外光固化研究进展

综述了近年国内外混杂紫外光固化研究的进展和应用情况。其中包括丙烯酸酯-环氧树脂体系、丙烯酸酯-乙烯基醚体系的自由基-阳离子混杂光固化,自由基-自由基体系混杂固化,光-热、光-空气及光-潮气混杂固化等。这些混杂固化方式使固化产物的综合性能更为优异。     

紫外光固化脂肪族聚氨酯丙烯酸酯的合成研究

以异佛尔酮二异氰酸酯(IPDI),季戊四醇(PETL)和丙烯酸羟乙酯(HEA)合成了可紫外光固化的四官能团脂肪族聚氨酯丙烯酸酯低聚物。研究了催化剂用量、反应物配比、合成反应温度和反应时间等对反应的影响。确定了最佳合成工艺条件:二月桂酸二丁基锡为催化剂;第1步反应用量为IPDI和PETL总质量的0.05%~0.08%;对羟基苯甲醚为阻聚剂,用量为总投料质量的1%;反应物配比n(PETL)∶n(IPDI)∶n(HEA)=1∶4∶4.12;第1步反应温度控制在55~75℃,反应时间2 h,第2步反应温度65~70℃,反应时间2~2.5 h。     

Role of sand on curing of partex surface by UV radiation

A partex surface was modified by a UV‐curing system with epoxy acrylate (EB‐600). A set of formulations was prepared with oligomer and the trifunctional monomer trimethylol propane triacrylate in different combinations of percentages (1–5%) of sand to study the role of sand in various physical properties of UV‐cured thin films, as well as partex surfaces. Increased pendulum hardness (PH), gloss, adhesion, and abrasion values were obtained by the addition of sand into the partex surfaces. The best results were obtained with the formulation containing 3% sand. An enhanced PH and a decreased percentage of gel content of the UV‐cured film was observed with an increase of the sand concentration. A simulated weathering test was performed with partex surfaces cured by a formulation containing 3% sand in the base coat. The losses of the physical properties were found to be lower over the surface treated with the formulation containing sand. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 2385–2392, 2002     

Development of photoluminescent powder coatings by UV curing process

The use of thermal curing powder coatings have obtained a wide acceptance, but is limited to the metal substrates applications, because they need high temperatures for the film curing. Safety sings in edifications use, generally, PVC substrates, that are unable to support typically curing temperatures (150–200 °C). In order to prepare a photoluminescent powder coating by UV curing process, an experimental technique was development and the influence of some preparative conditions were studied. To achieve the better results, photoluminescent pigment percentage, conditions of ultra-centrifugal mill and thickness of deposition coating were varied in order to increase the luminance decay time.     

UV固化水性环氧树脂的合成研究

对紫外光固化水性环氧树脂的合成工艺进行了研究,讨论了反应温度、反应时间、催化剂种类和用量,阻聚剂、羧基含量及固含量、中和剂等对水性环氧丙烯酸酯的合成和性能的影响。结果表明,合成环氧丙烯酸酯的最佳反应温度110℃,环氧丙烯酸酯与马来酸酐的最佳反应反应温度为80℃。反应时间均为5 h,三乙胺作催化剂,用量为反应物总质量的0.5%,对羟基苯甲醚作阻聚剂。实验表明,提出的紫外光固化水性环氧树脂的合成工艺可行,合成树脂具有水性特征,性能指标可以满足应用要求。     

一种新型光固化防雾涂料

固体材料表面上的雾化现象,对光学器件、农业用透明塑料薄膜、太阳能电池透光板等产品的应用产生严重影响。介绍了一种新型超亲水纳米二氧化硅微粒UV防雾涂料,可在高速生产状态下实现卷对卷塑料基材涂层瞬时UV固化,同时保持塑料基材的良好光学透明性。     

The effect of graphene oxide on UV curing kinetics and properties of SU8 nanocomposites

In the present study SU8 nanocomposites were prepared by incorporating graphene oxide (GO ), and its effect on the UV curing kinetics, morphology, electrical, hardness and thermal properties of the nanocomposites were investigated at different loading levels of GO (0.1 ? 3 wt%). Studying the reaction kinetics of the UV curing process by means of real‐time infrared spectroscopy showed that the polymerization rate and the final conversion of epoxy groups was related to the loading level of GO in the nanocomposites. An autocatalytic kinetics model of the curing reaction confirmed the effect of GO nanoparticles on the curing rate constant (k ), the order of the initiation reaction (m ) and the ultimate conversion of the UV ‐cured nanocomposites. Appropriate experimental observations indicated that dispersion of GO within the resin plays a critical role on the cure kinetics and final conversion. The results of the kinetics modeling and morphological observations showed that the curing rate constant of the nanocomposites is highly dependent on the GO content and its dispersion state, indicating that GO prevents epoxy resin crosslinking by photoinitator deactivation. Moreover, oxygen functionalities, such as hydroxyl and carboxyl groups, on the surface of GO facilitate interfacial interactions between epoxy groups from the matrix and GO . Electrical conductivity measurements demonstrated that the UV ‐induced photo‐cured GO filled resins are conductive SU8 nanocomposites. It was observed that the thermal stability of the nanocomposites is enhanced due to the dispersion of GO in the matrix. Moreover, the microhardness analysis showed that addition of GO to neat SU8 increases the mechanical hardness of the nanocomposite. © 2016 Society of Chemical Industry     

UV curing and matting of acrylate coatings reinforced by nano-silica and micro-corundum particles

For UV curable coatings, the effect of the type of photoinitiator and of the photoinitiator content on surface properties has been studied. Increasing photoinitiator concentrations yielded higher acrylate conversion but a lowering of surface hardness. Thus, curing under oxygen-free conditions with 2 wt.% photoinitiator should be applied rather than 6 wt.% photoinitiator for irradiation in air. Compared to nanocomposite materials, UV-cured polyacrylate coatings reinforced by silica nanoparticles and corundum microparticles exhibit markedly improved scratch and abrasion resistance. By using various grades of corundum, a synergetic effect between nano- and microparticles has been observed. These nano/micro-hybrid composite materials are recommended as clear coat for parquet and flooring applications.     

引发剂对UV油墨固化速度影响的研究

为提高UV油墨的固化速度,研究了羟烷基苯酮类1173、胺烷基苯酮类907、酰基磷氧化物类819、二苯甲酮类BP、硫杂蒽酮类ITX 5种引发剂及复配对UV油墨固化速度的影响。结果表明,引发剂浓度为2%,颜料浓度为4%,单体浓度为30%时,引发剂1173、BP的固化时间分别为20.88 s和70.56 s,引发剂907的光固化时间为7.14 s,引发剂819和ITX的光固化时间均可达到1.5 s。引发剂1173与BP进行1∶3复配时,固化速度是BP的4.9倍;引发剂907与BP进行1∶3复配时,固化速度是BP的4.3倍;引发剂ITX与907进行1∶1复配时,固化速度是907的2.3倍。     

Shaping of alumina microbeads by drop-casting of the photopolymerizable suspension into silicone oil and UV curing

The alumina microbeads were obtained by forming the drops of alumina suspensions in a silicone oil followed by UV curing. Due to the strong hydrophobic properties, silicon oil is a non-solvent (non-miscible) to the suspensions, thus the formation of perfectly rounded beads occurs spontaneously. The size of beads was controlled by a selection of a needle diameter and the position of needle tip: above or immersed in silicone oil. Thanks to that it was possible to obtain beads with diameters from 1000 to 1300 µm. The obtained alumina microbeads were characterized by quite a narrow size distribution, the differences in the size of the beads, within one series, did not exceed 1.5%. The research showed that the higher alumina volume fraction in suspensions favors the development of microstructure and thus influences mechanical properties. It was proved that the application of the methyl silicone oil as the environment responsible for the formation of the beads does not affect the sintering process.     

Nanoclay dispersion effects on UV coatings curing

Clay-based nanocomposites have already shown their great potential. In this study, clay–acrylate nanocomposite formulations, for wood finishes, were prepared in four differents ways. High-speed mixing, ball milling, bead milling and three roll milling were used to disperse clay into the neat acrylate formulation. The viscosity of the formulations was determined. Small angle X-ray scattering and transmission electron microscopy experiments were performed on these samples in order to study the quality of the dispersion. Then, photo-calorimetry and real-time infrared spectroscopy were used in order to investigate the effects of clay loading and clay dispersion on the ultraviolet curing. These studies have shown that UV curing is related to the quality of clay dispersion. Presence of large clay aggregates decreases the conversion of the acrylate functional groups, even at a small clay loading. However, a small amount of clay, well dispersed, can help UV curing.     

中国光固化材料生产与市场近况

光固化是一种先进的表面加工技术,其配方产品（如涂料、油墨和胶黏剂）在高强度紫外光或电子束作用下发生固化反应。目前这一光固化工艺已在工业部门的很多领域得到广泛应用。光固化配方产品主要是由低聚物、反应性稀释剂和光引发剂等原材料组成。自2005年以来,我国几乎所有的光固化材料（除光引发剂以外）都在持续增长,即使在2008年国际金融危机期间受到的冲击也不大。2010年的行业数据表明,我国光固化材料市场依然充满生机,不过高端应用的光固化材料仍然需要进口。     

UV exposure and temperature effects on curing mechanisms in thin linseed oil films: Spectroscopic and chromatographic studies

The influence of thermal and photochemical treatment in the curing mechanisms of thin linseed oil films is studied. The role of copper acetate pigments is also investigated under the above conditions. UV and FTIR absorption spectroscopy and chromatographic product analysis are used as the main analytical techniques, which allowed the identification of significant changes in the curing mechanism in each case. Yellowing, crosslinking, and fragmentation inside the film material proceed to a different extent according to the conditions. Peroxide destruction is induced by UV exposure at early curing stages and affects the course of the yellowing process. Yellow product formation is also favored by curing at elevated temperatures, which is accompanied in this case by decreased crosslinking in the cured film. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 84: 936–949, 2002; DOI 10.1002/app.10117     

紫外光固化涂料的研究进展及发展趋势

紫外光固化涂料是一种新型绿色环保节能涂料,近年来发展迅速。本文重点综述了紫外光固化涂料的国内外发展概况,介绍了光固化涂料的固化原理、组成及性能,阐述了其研究及应用现状,指出水性化和粉末化将是紫外光固化涂料未来的发展方向。