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。     

六芳基双咪唑复合光引发体系的研究及其在液态光致抗蚀剂中的应用

光引发剂邻氯代六芳基双咪唑(BCIM)、增感剂4,4-二(N,N’-二甲基-氨基)苯甲酮(EMK)与4种不同的供氢体N-苯基甘氨酸(NPG)、2-巯基苯并噻唑(MBO)、2-巯基苯并咪唑(MBI)、十二烷基硫醇(RSH)组成4种复合光引发体系。通过实时红外光谱研究了供氢体种类、复合引发剂用量对光致抗蚀剂感光性能的影响,并用该复合引发体系替代传统的907/ITX光引发体系制备线路板用液态光致抗蚀剂中,研究结果表明BCIM、EMK、NPG复合光引发体系效果比传统907/ITX光引发体系有提高,所得线路板成像边缘更光滑。     

复合光引发剂对UV油墨固化速度影响的研究

选用了 6种光引发剂进行复合配制黑色丝印UV油墨 ,实验结果表明 ,用复合光引发剂比用单一光引发剂配制UV油墨的固化速度快 ;在复合光引发剂中 ,应选择吸收光谱与颜料的吸收光谱相匹配的光引发剂 ,以及吸收光谱与光源发出的主波长较一致的光引发剂 ;另外 ,油墨中复合光引发剂含量应适量 ,这些对提高UV油墨的固化速度都有很大的帮助。     

双官能度单组分二苯甲酮类光引发剂的合成及引发活性研究

以4-（2-羟基乙氧基）二苯甲酮（4-BP）、丙烯酰氯和无水哌嗪为原料合成了一种双官能度单组分夺氢型光引发剂（4-BPAcPA）。通过红外光谱和核磁共振氢谱确认了结构;用UV分光光度仪研究了其紫外吸收、光解和迁移行为;用实时红外研究了光聚合动力学。结果表明：4-BPAcPA紫外吸收行为与4-BP相似,但摩尔消光系数是4-BP的2.17倍,光解速率快,迁移率仅为4-BP/EDAB体系的10%,引发HDDA效率的提高也意味着4-BPAcPA是一种能够单独引发体系聚合的高活性光引发剂。     

UV油墨固化窗口的探索

UV油墨固化的基本条件就是在一定的紫外光照射下激活油墨配方中的光引发剂生成自由基,进而引发整个油墨的化学反应实现油墨固化。UV油墨组成中含有的连接料、颜料、助剂、引发剂等成分都会竞争吸收紫外光,因此探索设计一个紫外光可以最大程度被光引发剂吸收的窗口是实现UV油墨高效固化的关键。     

华光YP-U型UV油墨印刷用PS版

UV油墨,亦称紫外油墨.UV油墨是将颜料分散到由预聚体、单体和光引发剂等物质组成的成膜物中,印刷时利用紫外线照射使油墨成膜并干燥. 在紫外光的照射下,UV油墨中的光聚合引发剂吸收一定波长的光子,激发到激发状态形成自由基或离子,再通过分子间能量的传递,使聚合性预聚体和感光络合体不断交联聚合固化成膜.     

新型氧酰基肟酯类光引发剂的制备与性能

制备了3种新型氧酰基肟酯类光引发剂。并用TLC、DSC和UV等手段对其溶解稳定性、热稳定性及紫外吸收特性进行了表征,发现其溶解稳定性良好,可溶于常见的有机溶剂,有着非常好的热稳定性,并且在g线(436nm)、i线(365nm)和深紫外处(DUV,248nm)都有很好的紫外吸收;还利用实时红外(RT-IR)红外实验及感光性能测试实验对此类光引发剂的光固化性能进行了测试。结果表明,与常见的自由基引发剂ITX、TPO、261等相比,其更适合用于405nm紫激光自由基光聚合成像体系及其他化学增幅光致抗蚀试剂体系中。     

光引发剂与颜料对喷墨印花用UV固化油墨固化速度的影响

制备了含有品红颜料的喷墨印花用聚氨酯丙烯酸酯油墨的UV固化油墨为.选择了7种光引发剂,在实验条件下测试了其固色速度(时间)为1.97～8.65秒,当引发剂的含量为6%时,固化速度达到最大;当有机颜料的含量由1%上升到5%时,固化时间也由不足1秒上升为6秒.实验结果表明,颜料在油墨中的最佳含量为3%.     

用FTIR跟踪监测环氧丙烯酸酯胶粘剂光固化过程的研究

用FTIR跟踪监测环氧丙烯酸酯胶粘剂光固化过程并研究了光引发剂体系中辐射时间与双键转化率的关系。研究结果显示,合理配合使用不同特征吸收波长的光引发剂,能有效利用紫外光源,提高固化速度。夺氢型光引发剂的引发活性低于断裂型光引发剂,断裂型光引发剂中α-羟基酮衍生物(1173)比α-胺基酮衍生物(907)和酰基膦氧化物(TPO)引发效率低。在α-羟基酮衍生物中185的引发活性又远远高于1173与184。复合型光引发体系和光引发剂与助引发剂联用的引发效率明显高于单一引发剂体系。     

UV油墨的制备与性能优化

探讨了预聚物、单体、光引发剂、颜料等组分对UV油墨固化速度、附着力、耐抗性等性能的影响,应用正交实验设计方法对UV油墨各组分种类进行选择,对正交试验结果做极差分析及方差分析,结果表明：根据预先设计的组分比例,采用预聚物PQ611,单体A,光引发剂B,活性氨为加速剂,获得性能较好的UV油墨。     

Iodonium salt improves the dentin bonding performance in an experimental dental adhesive resin

The aim of this study was to evaluate the influence of an iodonium salt on the immediate and long-term microtensile bond strength to dentin of an experimental dental two-step, self-etching adhesive system. A model dental adhesive resin was formulated using bisphenol A glicidyl dimethacrylate (Bis-GMA), triethylene glicol dimethacrylate (TEGDMA), and hydroxyethyl methacrylate (HEMA), which was polymerized using four combinations of photo-initiators and coinitiators. A group using only camphorquinone (CQ), two binary systems (CQ and ethyl 4-dimethylamine benzoate (CQ+EDAB), CQ and diphenyliodonium hexafluorphosphate (CQ+DPIHFP)) and a ternary system (CQ+EDAB+DPIHFP) was investigated. Clearfil SE Bond (CSEB) was used as a commercial reference. Bond strength to bovine dentin was assessed through microtensile bond tests measured in MPa in a universal testing machine. The beam specimens were stored in distilled water at 37 °C for 24 h and 1 year. Two-way ANOVA and Student–Newman–Keuls' post-hoc tests were used to compare means of groups (α=5%) and failure modes classified under magnification. After 24 h, the ternary system showed a bond strength similar to that of the binary system CQ+EDAB and the commercial material. After 1 year of storage, the μTBS values of the group CQ+EDAB+DPIHFP showed a bond strength significantly higher (p<0.05) than those of the CQ, CQ+DPIHFP, and CQ+EDAB groups and no difference from that of the CSEB group. The ternary photo-initiator system with iodonium salt maintained increased bond strength to dentin of model self-etching adhesive systems after 1 year of aging.     

新型喷墨打印墨水用水溶性染料

介绍了近年来研究开发用于喷墨打印墨水的新型水溶性染料的结构及合成方法,这些新型染料以偶氮类为主、属于酸性、直接或活性染料,用于墨水时具有较好的应用和牢度性能,其颜色包括黑色、品红色、黄色和青色。有43篇参考文献。     

新型紫外荧光油墨的研制

以自制的有机荧光粉为原料，研制了４种荧光油墨，在日光下，其印迹为白色，但在紫外线下分别呈鲜明的红色、黄色、绿色及蓝色荧光。测试了其荧光性质及质量标准。     

Benzodioxoles as alternative coinitiators for radical polymerization in a model‐dental adhesive resin

This study evaluated the effectiveness of benzodioxole derivatives as coinitiators of radical polymerization in a model‐dental adhesive resin. To compose the adhesive resin, a monomer mixture based on 50 wt % of Bis‐GMA, 25 wt % of TEGDMA, and 25 wt % of HEMA was used. Camphorquinone (CQ) 1 mol % was used as a photoinitiator to initiate polymerization. 1,3‐Benzodioxole (BDO) and piperonyl alcohol (PA) were used as coinitiators at 0.25, 0.5, 1, 2, 4, 8, and 16 mol % level. In addition, tertiary amine, ethyl 4‐dimethylamino benzoate (EDAB) was used as coinitiator in the control group. Some physical, chemical, and mechanical properties of the polymer formed in the experimental adhesives were evaluated using the kinetics of polymerization, sorption and solubility, flexural strength, and elastic modulus tests. The results indicated that BDO and PA were effective coinitiators in the photoinitiator system based on CQ. Comparisons between the benzodioxoles derivative coinitiators and EDAB showed similar performance in the kinetics of polymerization and flexural strength. For water sorption and solubility evaluation, BDO and PA demonstrated significantly more sorption of water and less solubility than the EDAB control group. The findings suggest that BDO and PA were feasible alternatives to conventional amine as coinitiator. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013     

Titanium dioxide grafted with silane coupling agents and its use in blue light curing ink

To improve the properties of titanium dioxide particles and realise their firm anchorage in blue light curing film, three modified titanium dioxide particles were prepared by grafting 3‐(trimethoxysilyl)propyl methacrylate, 3‐aminopropyltriethoxysilane and hexadecyltrimethoxysilane. The surface changes of titanium dioxide particles after modification were characterised. The dispersion stability, photo‐polymerisation, rheological and mechanical properties of modified titanium dioxide blue light curing inks were investigated. Results showed that compared with native titanium dioxide, modified titanium dioxide particles were more appropriate for blue light curing ink. The particle sizes of the three modified titanium dioxide particles became smaller, their surfaces exhibited hydrophobicity, and the viscosity of the modified titanium dioxide inks decreased slightly. Of the three modified titanium dioxide particles, 3‐(trimethoxysilyl)propyl methacrylate‐ and hexadecyltrimethoxysilane‐modified titanium dioxide particles exhibited better dispersion stability in blue light curing ink. In particular, 3‐(trimethoxysilyl)propyl methacrylate‐modified titanium dioxide blue light curing ink showed the best photo‐polymerisation and mechanical properties, which indicated the participation of the pigment grafted by double bonds in the blue light curable polymerisation. Using modified titanium dioxide in blue light curing ink, the dry/wet rubbing fastness of the printed fabrics improved.     

Colour management of a low‐cost four‐colour ink‐jet printing system on textiles

A low‐cost four‐colour (RBYK) dye‐based ink‐jet printing system for textiles was introduced in this study, in which red and blue inks were employed instead of the magenta and cyan inks used in half‐tone printing. The basis of a colour‐management system for this device was developed by determining the mapping between XYZ tristimulus values of output colours and the digital RBYK values using polynomial transforms. A second‐order equation was found to give the best performance with an average characterisation error of under 7 CIELAB units.     

UV-curable, special coding inks for optical fibers

A UV-curable, special coding ink for optical fibers consists chiefly of UV-curableprepolymers, coloring materials, and a photoinitiator. The UV-curable prepolymers are silicone epoxy benzoic acrylate (SEBA) and alicyclic hydrocarbon epoxy acrylate (ACEA). The coloring materials are disperse red urethane acrylate (RUA), disperse blue urethane acrylate (BUA), acridine yellow urethane acrylate (YUA), or their mixtures. The relationships of component-property of UV-curable, special coding inks were studied. The typical UV-curable, special coding inks were used to color the optical fibers. No. 30 Guan Shan Rd., Wuhan 430074, P.R. China.     

Turquoise blue nanocrystalline pigment based on Li1.33Ti1.66O4: Synthesis and characterization

Turquoise blue Li_1.33Ti_1.66O₄ is an environmentally friendly inorganic pigment, it was synthesized using the sol-gel method. The particle size was determined by X-ray diffraction (XRD) pattern and through high-resolution transmission electron microscopy (HRTEM), obtaining an average diameter of 27.5 ± 3 nm. The pigment shows a brilliant turquoise blue color, due to Ti³⁺-Ti⁴⁺ intervalence charge transfer transitions and presents thermal stability up to 1000 °C. The Li_1.33Ti_1.66O₄ nanoparticles were characterized by using X-ray diffraction, Raman scattering and UV-vis absorption spectroscopy. The color properties and the thermal stability of this pigment suggest that it has potential to be applied as a satisfactory pigment for cosmetics, plastics, glasses and inks.