共查询到20条相似文献,搜索用时 125 毫秒
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利用 4-羟基二苯甲酮( 4-HBP)和丙烯酰氯合成了 4-丙烯酰氧基二苯甲酮( 4-ABP),将其与丙烯酸类单体共聚制备了光交联型羟丙分散体( PCHAD)进一步与氨基树脂复配,得到了一系列光 /热双重固化羟基丙烯酸酯分散体 PCHAD-AR。利用差式,扫描量热仪、紫外分光光度计对 PCHAD-AR的光 /热双重固化行为进行了研究,探讨了光 /热双固化顺序和氨基树脂含量对涂膜性能的影响。结果表明:加入氨基树脂后不影响双固化体系的光交联行为;最佳固化工艺为先光后热固化,当光固化 60 s、170 ℃热固化 20 min,氨基树脂用量为分散体的 10%时,涂膜的 Tg为 57. 1 ℃,凝胶含量达到 98%以上,涂膜硬度为 3H,柔韧性为 0. 5 mm,附着力 0级,耐酸、耐醇、耐水稳定性均达到 10 d以上,相比于单一的光、热固化体系,双固化体系涂膜耐碱性提升,涂膜外观无明显变化的时间由 1d延长至 3d。 相似文献
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混杂紫外光固化研究进展 总被引:2,自引:0,他引:2
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。 相似文献
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光引发剂作为紫外光固化体系中重要的组成部分,对产品的最终性能具有决定性作用。随着紫外光固化技术的快速发展,必须寻找与之相匹配、性能优异的新型光引发剂。针对现有光引发剂存在氧阻聚及价格方面的缺陷,科研人员开发出各种新型光引发剂。本文在总结传统的商业化光引发剂的分类、特点、合成方法的基础上,对其在紫外光固化体系中的光固化效率进行了讨论。 相似文献
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添加活性稀释剂是调节光固化体系黏度、光固化反应速率、固化产物性能的有效手段。采用丙烯酸异辛酯(2-EHA)为活性稀释剂,利用实时红外(FT-IR)研究了活性稀释剂用量对双固化聚硅氧烷丙烯酸酯树脂(PSA)光聚合的影响。结果表明,稀释剂的加入不仅能改善体系的流变性能,同时稀释剂参与光聚合过程,提高体系的固化交联程度,改变交联网络,从而影响固化物的力学性能。通过红外跟踪研究了固化顺序(先光固化后湿气固化和先湿气固化后光固化)对体系中C=C双键和Si-OCH基团转化率的影响,结果表明,先光后湿的3固化顺序更有利于使体系达到高的转化率;DSC分析发现固化顺序对固化物玻璃化转变温度有一定影响。 相似文献
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《化学与粘合》2016,(1)
以E-51环氧树脂、正硅酸乙酯、钛酸正丁酯为原料,采用溶胶-凝胶法制备硅钛杂化环氧树脂,利用IR光谱对硅钛杂化环氧树脂的结构进行表征。研究了不同硅钛含量杂化环氧/聚酰胺固化体系的粘接性能、冲击强度和耐水煮性能;利用DSC、DMA、TG研究了硅钛含量对硅钛/环氧/聚酰胺固化体系固化反应温度、储能模量、玻璃化温度、热失重温度影响;利用扫描电镜对硅钛/环氧树脂/聚酰胺固化物断口的微观形貌进行了分析。结果表明:硅钛含量为0.55~1.09phr/100g Ep时,硅钛/环氧树脂/聚酰胺体系综合性能较好,硅钛/环氧固化体系具有较高粘接强度、冲击强度、模量、热分解温度、耐水煮性能。 相似文献
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紫外光固化涂料的氧阻聚效应 总被引:4,自引:0,他引:4
从氧的光化学能态方面分析了紫外光固化涂料的氧阻聚机理,详细讨论了抑制紫外光固化涂料氧阻聚的方法,包括开发阳离子聚合机理的反应体系,提高引发剂浓度或增加辐射剂量,使用对氧敏感度低的预聚物和单体,在光固化体系中加入氧清除剂,以及采用惰性气体保护法、石蜡保护法、覆膜法、强光辐照法和分步照射法等光固化工艺。 相似文献
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光固化涂料的应用进展 总被引:9,自引:2,他引:9
光固化涂料是 1种新型的绿色环保节能型涂料 ,近几年发展很快。本文介绍了光固化涂料的基础理论、各个组成部分、国内外的近期发展、研究现状及其应用 ,指出了光固化水性涂料和粉末涂料是其发展的 2大热点 ,同时介绍了光固化涂料在抗蚀剂中的应用 ,制造印刷电路板及制成UV光固化油墨等。 相似文献
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Zinah N. Alabdali Emanuel Irizarry Mary P. Reiter Ali Ashraf Jennifer K. Lynch-Branzoi Adrian B. Mann 《应用聚合物科学杂志》2021,138(20):50442
In many applications, it is desirable for photocured adhesives to have high-mechanical strength in the cured state, but relatively low viscosity when liquid. This was achieved by adding less than 0.5 wt% hydroxyapatite and graphene to methyl methacrylate with diurethane dimethacrylate (UDMA-MMA). Nanoindentation shows hardness increasing by 30–40% and indentation modulus by >30% compared to UDMA-MMA on its own. Rheometry shows only a small increase in uncured viscosity for the liquid state. The additives affect the optical properties, mobility of free radicals, photocuring, and degree of conversion, the effects of which are seen in Fourier transform infrared and micro-Raman spectra. Thermographic images taken during curing show that the additives impact the photocuring process. In addition, changes in intermolecular bonding are seen in the vibrational spectra when the additives are present. The enhanced mechanical properties are attributed to the observed changes in photocuring and bonding. 相似文献
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Particle clustering in photocurable nanocomposites: Dependence of curing kinetics and viscoelastic properties 下载免费PDF全文
Piotr Ziobrowski Ewa Andrzejewska Miroslaw Szybowicz Ariadna Nowicka Mariola Sadej‐Bajerlein Hubert Gojzewski Miroslaw Drozdowski 《应用聚合物科学杂志》2014,131(4)
The aim of this article is to investigate the effect of nanoparticle clustering on the mobility of nanoparticles in nanocomposites, using spectroscopic methods (Brillouin and Raman). Special attention is paid to the effect of particle clustering on photocuring kinetics. The model system was poly(2‐hydroxyethyl acrylate) filled with fumed nanosilica in concentration range encompassing the percolation threshold. Results obtained from Brillouin spectroscopy show substantial changes in the sound velocity and the attenuation coefficient with increasing filler content. The damping of acoustic waves reaches the maximum at the percolation threshold (~15 wt %), which is related to changes in the mechanism of acoustic wave propagation. The formation of the cocontinuous silica phase strongly affects the curing kinetics of the monomer/silica system: the polymerization rate is the highest at a silica content corresponding to the percolation threshold. These results correlate well with the results of AFM surface roughness analysis. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 39895. 相似文献
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碘鎓盐引发的环氧—丙烯酸酯复合光敏胶的研制 总被引:4,自引:4,他引:0
用合成的二苯基碘钅翁六氟磷酸盐作光引发剂 ,对不同比例的双酚A环氧树脂E5 1 和丙烯酸酯预聚物AE组成的复合树脂进行了光固化研究 ,证明了碘钅翁盐具有同时引发环氧和丙烯酸酯复合树脂按阳离子和自由基两种不同机理进行光固化的能力 ;考察了树脂的不同比例对固化速度的影响 ;同时选择一定比例的光敏复合树脂研究了增感剂 (DA)对光固化速度的影响。结果表明 ,这种复合光敏胶具有粘度低 ,光固化速度快 ,粘合力强 ,玻璃化转变温度低 ,耐水煮沸性好的优点 ,可作为新型UV -固化胶粘剂和防水性密封胶加以应用。 相似文献
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α,ω‐Dihydoxy‐terminated poly(L ‐lactide)s (PLLA diols) with various molecular weights (1000, 2000 and 3000 g mol?1) were prepared by the ring‐opening polymerization of L ‐lactide using 1,6‐hexanediol as an initiator. These were subsequently chain‐extended with the diacyl chloride of 4,4′‐(adipoyldioxy)dicinnamic acid (CAC) to obtain high‐molecular‐weight photocurable polyesters (CAC/PLLAs). The resulting polyesters were characterized by gel permeation chromatography, Fourier‐transform infrared, ultraviolet–visible and proton nuclear magnetic resonance spectroscopies, differential scanning calorimetry and thermogravimetry. These photoreactive polyesters were irradiated with a high‐pressure mercury lamp (λ > 280 nm) for 30–180 min to produce the crosslinked polyesters. The gel fraction yield increased with photocuring time, and exceeded 80 % after 180 min. The photocuring process disturbed the crystallization of the CAC/PLLA films, while it enhanced their thermal stabilities. With increasing photocuring time, both the tensile strength and modulus increased markedly. The best mechanical properties (tensile strength = 41 MPa; tensile modulus = 1550 MPa) were obtained for a CAC/PLLA‐3000 film photocured for 180 min. The tensile modulus of this photocured film was larger than that of pure PLLA. The hydrolytic degradation rates of the CAC/PLLA films in a phosphate buffer solution (pH, 7.2) of proteinaze‐k at 37 °C were much slower than those of pure PLLA films. Copyright © 2004 Society of Chemical Industry 相似文献
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UV固化材料进展 总被引:17,自引:0,他引:17
杨永源 《精细与专用化学品》2001,9(7):9-12
由于UV固化技术固有的特点使其在近几年各个领域都获得了高速的发展,但所占市场份额仍然很小。经过学术界和各大公司的努力,目前已经在UV固化材料方面取得了可喜的成绩。稀释单体、预聚体在数量和质量上都有大幅度增加,发展方向是降低刺激性、低毒和赋予特殊功能:在双光子引发自由基聚合、阳离子光固化、杂混光固化、光产碱催化聚合、无光引发剂光固化、水基固化方面取得了一定的进展;UV粉末涂料克服了传统粉末涂料的缺点脱颖而出,成为近年来研究开发的热点;UV固化纳米材料更是集纳米技术、纳米材料、UV固化技术于一体,预计将会开发出具有特殊功能的新材料;UV固化技术在电子、信息领域也具有很好的发展前景。 相似文献