可见光固化树脂稳定性的研究

光敏树脂由高功率、短波长紫外光固化向低功率、长波长的可见光固化的方向发展是该类树脂的一个发展趋势,紫外光固化树脂由于其对可见光不敏感的特点,使得它具有优异的稳定性而易于保存,而可见光固化树脂因对自然光较为敏感,其应用和贮存受到了更严格避光条件的限制,给人们的使用带来不便,为了改善可见光固化树脂使用时稳定性不够、易固化、不易保存的缺点,本文对影响可见光树脂的稳定性的两个组分,即光引发剂和光稳定剂进行了实验与分析,确定了能够有效改善可见光固化树脂使用及存储稳定性的配方,并对其效果进行了验证。     

齿科可见光固化复合树脂

介绍了齿科可见光固化复合树脂的特征、固化机理及研究进展。重点阐述了其组成及各组分对性能的影响,并对齿科可见光固化复合树脂的研究方向作了展望。     

可见光固化齿科充填复合树脂挠曲强度研究

以气相SiO2作为无机填料,从树脂基质和填料两个方面研究了可见光固化齿科用复合树脂的挠曲强度。详细探讨了树脂基质中环氧丙烯酸树脂与活性稀释剂的配比、填料含量、偶联剂对填料的处理等因素对复合树脂挠曲强度的影响。结果表明,对于纳米级的SiO2填料,当树脂基质体系的粘度较低时,复合树脂的挠曲强度较高;当SiO2的质量分数为25％并经偶联剂处理后,复合树脂挠曲强度最大,达到84．80MPa。     

GD可见光固化复合树脂的研究

本报告研究了GD可见光固化复合树脂基质树脂、单体和光敏引发体系的合成工艺以及微填料、粘结剂、遮色剂和酸处理剂的制备工艺;讨论了基质树脂、单体和光敏引发体系的结构、填料形态、光照时间等对复合树脂性能的影响;还讨论了复合树脂的色泽稳定性和透光率的影响因素;酸处理剂的物理形态对粘结性能的影响和气泡对复合树脂表面形态的影响。     

紫外光湿气双固化硅胶研究进展

综述了近年来国内外紫外光湿气双固化硅胶材料性能及制备方法的研究进展,并重点阐述了聚硅氧烷丙烯酸酯型、聚氨酯硅氧烷型和硅氧烷改性丙烯酸酯型等紫外光湿气双固化树脂的制备方法、结构组成及性能。指出了目前紫外光湿气双固化树脂材料研究中存在的一些问题,并对今后紫外光湿气双固化树脂的研究方向进行了展望。     

光固化不饱和聚酯树脂研究进展

综述了光固化不饱和聚酯树脂体系研究进展,其中包括:不饱和聚酯光敏预聚物的合成,可见光固化树脂,光固化UPR复合材料,光固化粉末涂料,紫外光固化胶衣树脂,光固化胶粘剂等。     

可见光引发剂研究进展

光固化技术的应用非常广泛，常用于光固化涂料、油墨、牙科固化、胶粘剂以及 3D打印材料等领域。与紫外光固化相比，可见光固化具备辐射安全、固化深度高、设备价格低廉等优势。作为光固化体系的重要组成部分，光引发剂的研究一直备受关注。本文对近 2~3 a可见光引发剂的研究进展进行了综述，主要从 TPO类、萘酰亚胺类、蒽醌类、咔唑类、硅酮类、肟酯类、共轭染料类、光生酸剂类和金属配合物类光引发剂 9个方面进行了综述，并对可见光引发剂的发展方向做了简单的概述。     

醛酮树脂在紫外光固化色漆中的应用研究

在紫外光固化色漆体系中选用醛酮树脂参与辅助成膜物的紫外光固化涂料的研制。讨论了醛酮树脂对体系的颜料润湿性、成膜附着力、涂膜硬度、丰满度的影响。最后得出了选择合适醛酮树脂在紫外光固化色漆中应用可以提高漆膜附着力,改变硬度,增加漆膜的丰满度和体系的润湿性能。     

热塑性丙烯酸酯树脂在紫外光固化涂料中的应用

在紫外光固化体系中引入非紫外光固化的热塑性丙烯酸酯树脂作为辅助成膜物.讨论了其对体系成膜附着力、柔韧性、硬度、光泽的影响.实验结果表明：选择合适相对分子质量的热塑性丙烯酸酯树脂可以改善紫外光固化涂料的附着力和柔韧性等漆膜性能.     

可见光固化复合树脂在粘接修复患牙中的应用

探讨可见光固化复合树脂在口腔护理中的应用效果。运用随机数字表法进行分组,实验组(40/74)选用可见光固化复合树脂材料进行修复,对照组(40/86)选用常规材料(烤瓷、合金材料)方式进行修复。修复完成1年后对患者进行随访,评估2组的修复效果。实验组的疗效评价优良率为81.08%,对照组为73.26%,实验组明显高于对照组,组间比较差异有统计学意义(P<0.05)。结果表明,可见光固化复合树脂材料在口腔美容修复中效果满意,较传统修复方式优势明显,配合优质的口腔护理其预后更好,获得较好的满意度。     

可见光固化树脂的研究

本文介绍了一种新型的可见光固化(VLC)树脂,通过与一般过氧化物固化的乙烯基酯树脂的机械性能和耐腐蚀性能比较可以看出,两者性能相当。但使用可见光,而非对人体有害的紫外光,安全环保,应用广泛;快速固化,苯乙烯挥发极少,操作简便,无需繁琐的添加促进剂及固化剂和脱泡过程。提高生产效率的同时,大幅度降低施工成本。     

3D打印用长波紫外光固化树脂的制备

通过优化引发剂的种类和用量,得到一系列阳离子和自由基混杂体系光固化树脂,并用旋转流变仪和SLA型3D打印机进行长波紫外光固化和3D打印成型。结果表明:与芳基鎓盐类阳离子光引发剂PAG202相比,芳茂铁盐类阳离子光引发剂261具有长波紫外光固化的适应性,而光敏增感剂PAS-50对光引发剂261敏化显著,在长波紫外光下光引发剂261/PAS-50体系能快速引发树脂固化。最佳配方时,固化树脂的弯曲模量高于国内外同类树脂的,且具有较低的固化收缩率。     

UV‐assisted screen‐printing of flat textiles

An approach to printing of flat textiles is presented in this work. A screen‐printing method was applied on a cotton fabric. An aqueous printing paste was prepared from thickening and crosslinking agents and an ultraviolet‐sensitive tetrazole ring‐based compound of 2,3,5‐triphenyltetrazolium chloride or nitrotetrazolium blue chloride. After the printing process, a pattern was just visible with the naked eye. The development of colour occurred after exposure of the textile to ultraviolet light of 253.7 nm and was caused by the transformation of 2,3,5‐triphenyltetrazolium chloride or nitrotetrazolium blue chloride salts into the corresponding formazans, which are insoluble in water. The printed designs were resistant to washing. The stability of the colour of the samples is discussed in the case of prolonged irradiation, both with ultraviolet light of 253.7 nm and with daylight. This method of printing is a recent proposition for creative textile designing. It also seems to indicate a likely type of dye that may be further developed as potentially attractive for ultraviolet‐assisted printing or dyeing of textiles.     

非金属掺杂的第二代二氧化钛光催化剂研究进展

寻求廉价、环境友好并具有可见光光催化活性的第二代光催化剂将是光催化发展进一步走向实用化的关键。氮掺杂的TIO2是新发现的具有可见光光催化活性的复合光催化剂,非金属掺杂可以使复合物的复合禁带宽度小于TIO2的禁带宽度,从而使TIO2的吸收边向可见光移动。对TIO2的氮、碳、硫、卤素掺杂国内外研究现状进行了系统评述,分析了提高TIO2可见光活性的原因,指出非金属元素特别是氮元素的阴离子掺杂是在不降低紫外光催化活性的基础上实现可见光响应的较好方法。     

提高TiO_2可见光分解水制氢活性的研究进展

近年来通过能带调控等手段实现TiO2光催化剂的可见光化被广泛研究,并取得了令人注目的进展。综述了提高TiO2可见光产氢活性各种手段,包括金属沉积、金属离子掺杂、染料敏化、阴离子掺杂和半导体复合等的研究进展情况,并对未来的研究方向作了展望。     

Effects of diluent's concentration upon the properties of organically modified ceramics based composites for application in dentistry

Organically modified ceramic resin (ormoresin) mixed with triethylene glycol dimethacrylate (TEGDMA) was used as the binder resin for the preparation of visible light cured dental composite. Three different combinations of ormoresin and TEGDMA were used for the preparation of composites, and their properties were compared in terms of depth of cure, diametral tensile strength (DTS), flexural strength (FS), flexural modulus (FM), Vickers micro hardness (VMH), water sorption (WS), and solubility. It is found that an optimum amount of diluent is necessary for better crosslinking and properties of cured composites based on ormoresin. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 94: 469–473, 2004     

Preliminary assessment of the ultra violet curing of composites manufactured by the resin infusion between double flexible tooling process

This study evaluates the feasibility of designing and incorporating a cure on demand system into the resin infusion between double flexible tooling (RIDFT) process, using ultraviolet (UV) light for the curing of composite laminates. This work set out to develop a process for the RIDFT that would eliminate or reduce the inflexibility in the current production process, resulting in shortened production cycle times. UV cured laminates were produced at a fraction of the time required for catalyst cured laminates. Mechanical and rheological tests were performed on each of the UV cured laminates produced. The results were referenced against those obtained for laminates produced using a catalyst curing system to determine their overall quality. Experimental results from the tensile and rheological tests inferred that the UV cured laminates yielded material properties that were comparable and in a few instances slightly better than that of thermally cured laminates. POLYM. COMPOS., 27:417–424, 2006. © 2006 Society of Plastics Engineers     

Yellow resistant photosensitive resin for digital light processing 3D printing

Digital light processing (DLP) has been studied and developed in the field of three-dimensional (3D) printing in recent years due to its fast curing rate and high resolution. To reduce the cost and viscosity of the resin system, the aromatic polyurethane acrylates (PUAs) were used as oligomer. The matrix resin called PUH₂ consists of oligomers (PUA, bisphenol A polyoxyethylene ether dimethyl acrylate) and active diluents (hydroxyethyl acrylate, hydroxyethyl methacrylate). However, the photosensitive resin containing aromatic isocyanate groups was easily yellowed under ultraviolet light. In this article, we developed a resin for DLP 3D printing with yellowing resistance, excellent mechanical properties and high heat resistance. The optimal ratio of 3DP-PUH₂ resin was PUH₂/TPO/RYOJI-292/dye/nanosilica = 100/5/0.4/0.01/0.1, and its viscosity was 500 cp, which is suitable for DLP 3D printing. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 48369.