有机硅改性光敏促进剂的研究

以多官能丙烯酸酯为骨架，接入含氢硅氧烷分子链，并引入有机胺基团合成了一种性能优良的有机硅改性光敏促进剂．介绍了其基本配方，并对两步反应对光敏促进剂性能的影响、反应温度及反应时间对两步反应的影响等进行了研究、该促进剂能显著提高涂膜的光固化速率，改善涂膜的消泡和流平性能，     

Photo-Curing 3D Printing of Thermosetting Sacrificial Tooling for Fabricating Fiber-Reinforced Hollow Composites

Carbon fiber-reinforced hollow composites play a vital role in lightweighting modern cars and aircrafts. Fabrication of such hollow composites with seamless internal finish requires sacrificial tooling that can be used under pressure and high temperature. For the very first time, high performance sacrificial tooling that can be used to fabricate fiber-reinforced hollow composites is produced using photocuring 3D printing technology. This is achieved by developing UV-curable resins containing highly soluble yet hydrolysable acetal acrylate cross-linker and hydrophilic 4-acryloylmorpholine monomer. It is found that the cross-linker content greatly affects the printing speed. Further, the widely adopted UV post-curing method is found to have negligible impact on improving the thermal-mechanical properties of printed structures. After thermal post-treatment, printed sacrificial tooling exhibits a heat deflection temperature of 112 °C at 0.455 MPa and an average coefficient of linear thermal expansion of 59 ppm °C⁻¹ between 30 and 100 °C. As a result, printed tooling enables fabrication of carbon fiber-reinforced hollow composites with complex geometry, which shows a tensile strength of 802 MPa and an elastic modulus of 50.2 GPa.     

光固化树脂结合剂磨具的研究与进展

采用光固化树脂作为结合剂制作有机磨具是近年来先进制造领域里的一个新型制造工艺.首先介绍了光固化快速成型技术,随后讨论了光固化树脂结合剂磨具的研究现状.分别从国外和国内两个方面,针对光固化树脂磨具的不同类型的研究和光固化树脂磨具的性能研究进行了详细介绍.     

（急）3D打印气凝胶的研究现状

气凝胶材料具有高比表面积、高孔隙率、低密度以及低热导率等诸多优良性能，被认为是21世纪的十大新材料之一。然而传统气凝胶由于其力学性能有限，难以经过后加工技术形成所需的复杂形状结构，满足实际应用的需求。因此，无需复杂后处理即定制化制备复杂形状结构材料的3D打印技术有望成为突破气凝胶材料应用瓶颈的先进制造技术。本文从3D打印气凝胶的技术种类和材料类型两个方面，综述了3D打印气凝胶材料的研究进展；归纳了3D打印气凝胶材料在阻燃隔热、介电和组织工程中的独特应用并展望了3D打印气凝胶的发展趋势。最后指出扩宽3D气凝胶材料的材料体系、开发更适应气凝胶打印的3D打印技术、提升打印精度与速度和深入研究3D打印气凝胶的可控孔隙结构对其性能的影响是未来的几个重要的研究方向。3D打印气凝胶材料的开发有望促进气凝胶材料的快速发展。     

紫外阳离子光引发剂及其发展动态

阳离子型光引发聚合是一种快速、高效、低能耗和低污染的聚合方式。着重介绍阳离子光引发剂的主要种类、各自的特点及其光引发机理,简述阳离子光引发剂在涂料中的应用和发展,并对今后的研究方向进行了展望。     

Nano-silica modification of UV-curable EVA resin for additive manufacturing

Due to layer by layer printing, the interlayer adhesion of resin used in extrusion-based additive manufacturing (AM) is poor, while thermal curing affects the accuracy of the resin. Therefore, methods of photo-curing and nanomodification were used in this work to improve the adhesion between layers and the overall performance of AM resins. Specifically, ethylene-vinyl acetate (EVA) copolymer with dual curing agent of benzophenone/triallyl isocyanurate (BP/TAIC) and nano-silica (NS) were introduced. The results of light transmittance, scanning electron microscopy and gel content test showed that BP/TAIC with NS were proved to be able to improve the curing process of EVA. The filling of a small amount of NS did not act as ultraviolet light barrier, but instead improved the photo-curing of the resin and reduced the amount of agents. UV curing also improved the adhesion between layers of EVA resin. The tensile strength was 7.1% higher than that of EVA/NS/BT without curing. At the same time, due to good interface bonding and dispersion, the thermal conductivity of resin improved from 0.212 W/m·k to 0.252 W/m·k. A 16.1% raise in tensile strength and a 10.0% increase in the volume resistivity were demonstrated for the 3.0 wt% NS. Furthermore, this resin is potential to be used in AM.     

UV胶粘接ABS固化速率的研究

介绍了紫外光固化速率的基本概念和特点,讨论了光引发剂、预聚物、活性稀释剂及氧阻聚对ABS粘接时固化速率的影响.     

巯基化合物的合成及巯基-乙烯基光固化工艺

合成出三种不同官能度的巯基化合物,在对其表征的基础上,利用傅立叶变换红外光谱原位跟踪和紫外光差示扫描量热实时跟踪方法,研究了巯基化合物官能度、巯基与乙烯基配比和辐照强度对巯基-VL20体系光固化反应的影响规律。结果表明:高官能度的巯基化合物,反应速率较快;光聚合反应速率约与光强的0.5次方成正比。     

不饱和聚酯-环氧树脂嵌段共缩聚型光敏预聚物的合成

提出了一种由不饱和聚酯和环氧树脂嵌段共缩聚，合成一类新型先教预聚物的方法。谈光敏预聚物采用两步法合成。第一步先合成具有一定分子量和端羧基的不饱和聚酯，第二步使该不饱和聚酯与环氧树脂反应，生成嵌段共缩聚物。该光敏预聚物的分子量通过调节不饱和聚酯的分子量控制。不同分子量的先教预聚物呈现出不同的光敏性和力学性能。     

光固化保护套在定向钻穿越管道上的应用

黑龙江定向钻穿越管道采用工厂预制3LPE外防腐层,为保护外防腐层,在防腐层外又包覆了一层可光固化的改性环氧玻璃钢防护层。文章从光固化材料管道保护套的技术指标、主要施工技术措施、管道起重方案、光固化材料的保护作用及工程应用效果等方面介绍了该材料在定向钻穿越管道上的应用。应用效果表明,包覆了该材料的管道在回拖后,即使出现少量的划痕,经过计算也具有超过50年的使用寿命,远高于20年的设计使用寿命。