紫外光固化涂料用光引发剂的应用研究进展

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。     

Novel polymeric photoinitiators with side-chain benzophenone: Facile synthesis and photopolymerization properties without coinitiator

A novel polymeric photoinitiator, poly(glycidyl benzophenone ether) (PGBE), with a side-chain benzophenone (BP) group was synthesized from poly(epichlorohydrin) and 4-hydroxybenzophenone. The structure of PGBE was characterized by IR and ¹H NMR. The light absorption of PGBE was detected by UV spectrophotometer with the maximum absorption wavelength at 283 nm in acetonitrile solvent, which were red-shifted compared with BP. The obvious advantage of this initiator was the elimination of amine based hydrogen donors and to provide alternative hydrogen donors with easy availability and non-toxicity. The photopolymerizations of tripropylene glycol diacrylate (TPGDA) and trimethylolpropane triacrylate (TMPTA) initiated by PGBE and BP/EDAB were studied by real-time FT-IR. The polymeric initiator was found to have higher efficiency than BP/EDAB.     

聚氨酯型高分子硫杂蒽酮光引发剂的制备及性能研究

通过三种二异氰酸酯、2-（2,3-二羟基）丙氧基硫杂蒽酮（HPTX）及N-甲基二乙醇胺(MDEA)进行逐步聚合反应,将硫杂蒽酮结构及共引发剂胺结构引入到同一高分子链上,得到侧链含有硫杂蒽酮,主链含有共引发剂胺的聚氨酯型高分子光引发剂。傅立叶红外变换光谱和核磁共振氢谱证实了高分子光引发剂的结构。紫外光谱证实了高分子链的结构对硫杂蒽酮单元的最大紫外吸收几乎没有影响。用光致差示量热计（photo-DSC）研究聚氨酯型高分子光引发剂引发聚氨酯丙烯酸酯树脂（PUA）的光聚合反应,发现PU-IMTX是本文合成的引发剂中引发PUA光聚合最有效的光引发剂。     

常用光引发剂在紫外光固化涂料中的应用研究

针对紫外光固化体系,研究了常用光引发剂在紫外光固化涂料中的应用。讨论了常用光引发剂的用量及其对亮光体系、亚光体系和色漆体系固化性能的影响。得出在紫外光固化涂料中选择引发剂的规律。     

光固化胶粘剂的研究进展

介绍了紫外光和可见光固化型胶粘剂体系中光引发剂的最新研究进展,重点论述了紫外光和可见光固化型胶粘剂的最新发展。     

电子束固化技术及可电子束固化环氧树脂体系

论文综述了电子束固化树脂基复合材料技术的特点及其在国内外的研究及发展状况 ,并介绍了可电子束固化的环氧树脂和光引发剂及其阳离子固化机理 ;具体地描述了经电子束固化的树脂浇铸体及复合材料的性能。     

1-羟基环己基苯基甲酮合成新工艺

以环己基甲酸为原料,采用新的工艺通过酰氯化、傅-克酰基化反应、卤化、水解制得1-羟基环己基苯基甲酮光引发剂。新工艺选取三氯化磷为酰氯化剂,环己基甲酸与三氯化磷的为酰氯化剂,环己基甲酸与三氯化磷的物质的量比为1：0．43,75℃下反应2．5h,收率94．6％。卤化反应中采用溴为卤化剂,70℃下反应,反应时间0．25h,收率98％。跟原工艺相比,新工艺大大减少了有害气体的产生,缩短了反应时间,且全程收率达到69％。     

Polymer-bound hydroxamic dithiobenzoic anhydride: a new heterogeneous photoinitiator

Poly(methylmethacrylate) resins crosslinked with divinyl benzene, ethyleneglycol dimethacrylate and N,N′-methylene-bis-acrylamide were functionalized to generate a photodissociable chromophore, S-benzoyl-o-dithiohydroxamate. These polymeric mixed anhydrides were found to be efficient heterogeneous initiators in the light-induced polymerization of acrylic and vinyl monomers. On UV irradiation, both homopolymers and graft polymers were obtained. Polymerization of MMA was followed at various time intervals and as a function of monomer and initiator concentrations. On varying the initiator concentration, the rate of polymerization passed through a maximum. © 1998 SCI.     

联苯双(环左二烯-铁)二价阳离子作为环氧化合物聚合的有效的阳离子光聚合引发剂

Ferrocenium monocations as photoinitiators for cationic photopolymerization suffer from a limitation of low absorption and low reactivity under high-pressure Hg lamp.Here,a ferrocenium dication salt,biphenyl bis [(π-cyclopentadienyl)iron]hexafluorophosphate[bis(Cp-Fe)-biphenyl](PF6)2 was synthesized by the ligand ex-change reaction between ferrocene and biphenyl.The chemical structure was characterized with FTIR and HNMR.The separation of ferrocenium monocation cyclopentadien-iron-biphenyl hexanuorophosphate([Cp-Fe-biphenyl]PF6) and dication [bis(Cp-Fe)-biphenyl](PF6)2 was carried out by coulumn chromatography.The photoactivity of initiating photolymerization of epoxide ERl4221 was studied as a cationic photoinitiator.[Bis(Cp-Fe)-biphenyl](PF6)2 can efficiently absorb radiation above 300nm and its photoactivity is higher than that of its monocation.     

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。