共查询到18条相似文献,搜索用时 156 毫秒
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《塑料工业》2019,(10)
利用光固化三维(3D)打印技术对有机硅材料进行成型加工,需要先对有机硅材料进行光敏改性。采用硅氢加成与酯交换的方法,在硅油上引入丙烯基团,制备出一种立体光固化(SLA)3D打印用光敏有机硅预聚体。在此基础上,对不同种类的光引发剂在光敏有机硅预聚体中的溶解度、固化时间及用量进行了探索;在具有最佳效果的光引发剂的种类与用量下,对光敏有机硅树脂固化深度进行了探索;确定了最佳光固化效果的配方后,对光敏有机硅树脂进行了光固化3D打印成型。结果表明,在实验选材范围内,光引发剂2,4,6-三甲基苯甲酰基-二苯基氧化膦(TPO)在光敏有机硅中具有较大的溶解度与较好的光引发效果;当光引发剂TPO的用量为4%时,光敏有机硅树脂具有较好的光反应特性;在不用活性稀释剂、溶剂以及热能的条件下,制备的有机硅光敏树脂可以在SLA3D打印机中完整地成型出制件。 相似文献
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光敏树脂是光固化3D打印的材料基础,也是光固化3D打印陶瓷的成型媒介。光敏树脂体系影响光固化3D打印陶瓷构件成型过程的收缩率与脱脂过程的应力,本文设计了含环状结构的单官能度树脂、三官能度树脂及引入预聚物及稀释剂的多组分树脂三个树脂体系,测试了三个树脂体系的收缩率,研究表明引入预聚物及稀释剂的树脂体系具有最低的固化收缩率,有效缓解了因固化反应收缩造成的3D打印氧化铝陶瓷素坯开裂的问题。采用热失重分析和热处理实验研究了三个树脂体系的热分解行为,多组分树脂体系具有分阶段热解的特性,采用该树脂体系制备了光敏性氧化铝浆料,优化了光固化打印参数及脱脂气氛,3D打印厚壁实心(12 mm×12 mm×12 mm)样件与大尺寸(?80 mm×50 mm)的氧化铝陶瓷素坯脱脂后均无裂纹等缺陷。 相似文献
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目前,3D打印已应用于各行业中,打印材料的选择成为制约3D打印技术进一步发展的关键因素。光固化3D打印技术由于打印速度快、成品精度高、对环境无污染等优点被广泛应用,而光敏树脂作为光固化3D打印的主要材料对打印系统的性能起关键作用。本文简单介绍了3D打印光敏树脂的成分,对3D打印光敏树脂的3种类型进行了说明,并对3D打印光敏树脂复合/改性材料的研究进行了阐述。展望指出研究出性能好的3D打印光敏树脂复合/改性材料是3D打印技术不断满足各行各业多元化发展需求的重点课题。 相似文献
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主要介绍了3D打印用光敏树脂的研究进展,包括为提高打印件性能而进行的光敏树脂的改性的研究现状,以及光敏树脂的电学、热学、生物医药等方面的功能化研究,最后对3D打印光敏树脂的发展做出总结及展望。 相似文献
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In order to lower the volume shrinkage of the DLP 3D printing photosensitive resins during printing, a thiol-terminated hyperbranched polymer (T-HBP) was synthesized and introduced into the bisphenol A epoxy acrylate (EA) based photosensitive resin system. The obtained T-HBP was characterized by FTIR and 1H NMR spectra, and the grafting rate of sulfhydryl was determined. The mechanical properties of the photosensitive resins were measured by tensile and impact strength measurement. The glass transition temperature of the photosensitive resins was analyzed by DSC and the impact fracture surface was observed by SEM. T-HBP exhibited a much lower viscosity than its linear counterparts, and the addition of thiol improved the curing speed of the photosensitive resins. When the amount of T-HBP added was 20 wt%, the shrinkage of the photosensitive resins was reduced by about 45.5% and the impact strength increased by 33.9% compared with the control. The macromolecular spherical structure of T-HBP effectively reduced the functional group density of the photosensitive resins. In addition, the thiol-acrylate photopolymerization introduced by T-HBP further reduced the volume shrinkage of the photosensitive resins. 相似文献
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3D打印用高分子材料及打印成型工艺参数优化研究进展 总被引:1,自引:0,他引:1
综述了近年来应用在3D打印成型技术中的高分子材料。其中,通用塑料包括综合性能优异的丙烯腈-丁二烯-苯乙烯三元共聚物、可生物降解的聚乳酸和聚己内酯;典型工程塑料和特种工程塑料主要包括聚碳酸酯和聚醚醚酮;热固性塑料主要有光敏树脂。不同的高分子材料性能不同,所采用的3D打印技术也各不相同,最终制备的3D打印制件应用领域也各不相同。除了对制件母材进行筛选外,3D打印工艺参数也会对制件质量产生显著的影响,而计算机辅助技术在这一方面的应用较为广泛。 相似文献
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《Ceramics International》2022,48(1):304-312
In this study, a novel method was proposed for preparing high-flux ceramic membranes via digital light processing (DLP) three-dimensional (3D) printing technology. Two different alumina powders were well dispersed in a photosensitive resin to form a UV-curable slurry for DLP 3D printing. The effects of the grading ratio on the viscosity of the slurry and the porosity, pore size distribution, mechanical strength, roughness, and permeability of the ceramic membranes were systematically investigated. The thermal treatment conditions were also studied and optimized. The obtained ceramic membranes exhibited a uniform pore size distribution, a high porosity, a low tortuosity factor, and an asymmetric structure. The combination of these factors led to a high flux for the 3D-printed ceramic membranes. DLP 3D printing exhibited a good potential to be a strong candidate for the next generation of ceramic membrane fabrication technology. 相似文献
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综述了通用塑料、工程塑料、生物塑料和光敏树脂等3D打印用材料的研究进展,分析了3D打印高分子材料面临的发展问题,提出了相应的对策。 相似文献
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《Ceramics International》2023,49(4):5604-5612
A deliberately selected end-capping agent was introduced into the precursor to form a low number average molecular weight precursor and meet the need for liquid crystal display (LCD) 3D printing. The influence of number average molecular weight on the photocuring properties of precursor and the physical properties of pyrolysis samples were studied in detail for the first time. The results proved that a relatively low number average molecular weight precursors had low ceramic yields after pyrolysis. As the number average molecular weight of the precursor decreased, the photocuring ability of the precursor photosensitive resin increased. With the decrease in the number average molecular weight of the precursor in the precursor photosensitive resin, the ceramic yield of 3D printed PDCs decreased from 58.4% to 30.2%, and the linear shrinkage increased from 27.2% to 40.3%. The bending strength of the LCD 3D printed specimen reached 61.5 ± 3.7 MPa. The low cost of precursor synthesis and equipment in this study points the way for the preparation of precursor non-oxide ceramic composites and can be conducive to the development and application of LCD 3D printing precursor ceramics. 相似文献
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Alice Shannon Callum Guttridge Aidan O'Sullivan Kevin J. O'Sullivan Seamus Clifford Achim Schmalenberger Leonard O'Sullivan 《应用聚合物科学杂志》2024,141(12):e55122
Vat polymerization technology allows filler particles to be incorporated into photosensitive 3D printing resin to improve the properties of the printed material. This method can be used to produce medical devices with an antimicrobial effect that can reduce biofilm formation and reduce infections due to indwelling devices. Metal oxides have the potential to combat antibiotic-resistant bacteria, further lowering the risk of hospital-acquired infections. The antimicrobial agent in this study, silver oxide, was evaluated for its antimicrobial effect against gram-positive bacteria (Staphylococcus epidermidis) as these are the main cause of biofilm formation. The 3D printed samples demonstrated a strong antimicrobial effect at low concentrations of 1 wt.%. Two vat polymerization technologies, stereolithography (SLA) and digital light processing (DLP), were compared for their suitability for producing 3D printed samples with an antimicrobial effect. DLP successfully produced samples with mechanical properties comparable to the base resin, whereas SLA samples had reduced mechanical strength at higher concentrations of silver oxide filler. Neither printing technology nor silver oxide concentration had a statistically significant effect on the mechanical properties of the printed materials. 相似文献