UV固化喷墨中光引发体系的研究

本文选择了6种光引发剂和5种颜料，测试了光引发剂和颜料的吸收谱图。研究了不同颜料体系的光引发剂与UV喷墨固化时间的关系，其中涉及单引发体系与复合引发体系对固化时间的影响。     

UV 丝网印刷油墨制备及性能研究

通过设计不同配方,制备了UV丝网印刷油墨,研究了预聚物、光引发剂、活性稀释剂、颜料的种类和含量对UV绿色油墨的固化时间、附着力、柔韧性和耐溶剂性能的影响。研究结果表明:聚酯丙烯酸酯和聚氨酯丙烯酸酯组成的复合预聚物体系,使UV油墨具有优良的性能;当预聚物复合体系质量分数为51%,其中聚酯丙烯酸酯和聚氨酯丙烯酸酯的质量比为4∶1,Darocur1173质量分数为7%,绿色颜料为4%,活性稀释剂HD-DA为33%时,UV油墨的综合性能最佳。     

(2,4,6-三甲基苯甲酰基)二苯基膦氧化物的合成及光引发性能测试

合成了光引发剂 （2,4,6-三甲基苯甲酰基 ）二苯基膦氧化物（ TPO）,测试了其在丙烯酸改性环氧树脂体系清漆和色漆中的光引发性能.结果表明,与其它光引发剂相比, TPO可缩短清漆和色漆的固化时间;TPO的最佳用量为丙烯酸树脂的 4%（质量分数）.     

新型光潜碱:光致叔胺光引发剂的研究进展

传统光潜碱光解时生成伯胺或仲胺,主要用作交联剂。作为催化剂时效率低,限制了它在紫外光固化中的应用。近年,光潜碱成为新型光引发剂研究的热点,开发了季铵盐、α-氨基酮、四苯基硼酸胍等新型光潜碱。这些光潜碱受紫外光照射时能释放出游离的叔胺、脒类或胍类含氮碱,可引发阴离子聚合,催化在紫外光照射后预聚体的另类固化反应,促进了紫外光固化技术的发展。光致叔胺已用于汽车光固化涂料等的开发。本文介绍新型光潜碱及其在紫外光固化的研究进展。     

Photoinitiating Characteristics of Benzophenone Derivatives as Type Ⅱ Macromolecular Photoinitiators Used for UV Curable Resins

Dodecyl-benzophenone(DBP) and hexadecoxyl-benzophenone(HDBP) as type II photoinitiators used for radical photopolymerization systems were synthesized by Friedel-Crafts reaction, and characterized by 1H NMR and FTIR spectroscopy. The UV-Vis absorption spectra of DBP and HDBP, propitious to photopolymerization under a commercial mercury UV bulb are centered at 345 and 335 nm, respectively. HDBP has higher extinction coefficient than DBP, but lower photoinitiating efficiency. Their photoinitiating performances for E13605, a bisphenol A epoxy acrylate with 40%(mass fraction) tripropyleneglycol diacrylate (TPGDA), resin consisting of bisphenol A epoxy acrylate and tripropyleneglycol diacrylate in the presence of triethanolamine as a coinitiator were investigated by photo-differential scanning calorimetry(photo-DSC). DBP initiates the curing of acrylate more efficiently than HDBP,showing higher photopolymerization rate and unsaturation conversion. resulted from the poor compatibility of HDBP with the resin. The photoinitiating activity of DBP to epoxy acrylate resin is even higher than that of BP at lower loadings.     

紫外光固化墨水应用研究新进展

UV喷墨墨水中包含着预聚物、单体、光引发剂、颜料、助剂等组分,其中预聚物是构成UV喷墨墨水组分的基本骨架,其性能对固化过程和固化膜的性质起决定作用;单体作为活性稀释剂影响墨水体系的黏度和固化速度;光引发剂的作用是吸收紫外光能量,同时产生游离基,促使油墨发生聚合反应,是光固化体系的关键组分。介绍了常见UV喷墨墨水中预聚物、单体和光引发剂的组成、特性以及最新应用研究动向。     

Synthesis and photoinitiating behavior of benzophenone-based polymeric photoinitiators used for UV curing coatings

Three benzophenone-based type II polymeric photoinitiators, poly(2-(4-benzophenone methylene ether)-1,3-dihydroxypropane maleate)) (PBM), poly(2-(4-benzophenone methylene ether)-1,3-dihydroxypropane succinate)) (PBS), and poly(2-(4-benzophenone methylene ether)-1,3-dihydroxypropane-co-2-(phenyl-methylene-ether)-1,3-dihydroxypropane maleate)) (PBPM) used for free radical UV curing systems, were prepared through the step-growth polymerization of 4-(2,3-epoxypropyloxy) benzophenone (EBP) with maleic anhydride and succinic anhydride, as well co-polymerization with phenyl glycidyl ether and maleic anhydride, respectively. The molecular structures were characterized with ¹H NMR and FT-IR spectroscopy, and GPC analysis. For equimolar EBP and MA reaction system, the M_n led to the maximum of 6868 g/mol with the PDI of 1.22. The UV spectroscopy analysis showed that the synthesized polymeric photoinitiators possess higher UV absorption intensity in the wavelength range of 300–400 nm compared with benzophenone (BP). The photoinitiating activity was examined based on the photopolymerization of tripropyleneglycol diacrylate (TPGDA) in the presence of triethylamine as a coinitiator by using Photo-DSC method. It was found that PBM and PBS showed higher photoinitiating efficiency than BP in the photopolymerization of TPGDA. Moreover, the side BP moiety incorporated into the polymeric chain possessed higher initiating activity than end-capped BP moiety. Moreover, PBM with higher molecular weight was more efficient to photoinitiate TPGDA UV-cured. The side chromophore group distribution in the molecular chain also affected the photoinitiating activity. The highest photopolymerization rate at the peak maximum was obtained by the photoinitiation with PBM prepared with the molar feed ratio of 1.0 of EBP to MA.     

Dehydrogenative Coupling of Poly(phenylsilane) by Metallocene Catalysis

The use of two different types of metallocene catalysts in the dehydrogenative coupling of phenylsilane to produce poly(phenylsilane) was investigated. The metallocene catalysts were first synthesized (i) through the reaction of zirconcene dichloride with n-butyllithium in toluene and (ii) through the reaction of zirconocene dichloride with sec-butyllithium in toluene. After the catalyst synthesis, phenylsilane was added in situ commencing polymerization of the phenylsilane to poly(phenylsilane) through dehydrogenative coupling in each case. The resulting poly(phenylsilanes) were characterized by ¹H NMR, GPC, FTIR, and UV/Vis, and were shown to be successful photoinitiators for a variety of acrylate and methacrylate type monomers.     

紫外光固化涂料的组成及研究

介绍了UV光固化涂料用齐聚物、单体、光引发剂以及助剂的开发。描述了UV阳离子固化、混杂固化用齐聚物、单体和光引发剂的作用,以及UV光固化涂料用助剂和改性树脂的应用。展望了UV光固化涂料的国内外市场发展前景。     

Synthesis and photopolymerization kinetics of a photoinitiator containing in-chain benzophenone and amine structure

A photoinitiator HTD bearing in-chain benzophenone (BP) and coinitiator tertiary amine, based on 4-hydroxybenzophenone (HBP), toluene-2,4-diisocyanate (TDI) and N,N-dimethylethanolamine (DMEA), was synthesized and characterized by ¹H-NMR and UV-vis absorption spectroscopy. HTD had longer absorption wavelength in the UV-vis absorption spectra than the low molecular counterpart BP. The kinetics of photopolymerization was studied by real-time Fourier transformation infrared (FTIR) spectroscopy. It showed that HTD was a more effective photoinitiator than BP. When this photointiator was used to initiate polymerization of acrylates, both rate of polymerization and final conversion increased with increase of initiator concentration and light intensity. UV-vis extract analysis showed that the extractability of HTD was much lower than BP/DMEA on the same environment condition.