3D喷墨打印用光固化型电子浆料的制备与研发

发布时间：2018-01-14 01:15

本文关键词：3D喷墨打印用光固化型电子浆料的制备与研发　出处：《浙江工业大学》2016年硕士论文　论文类型：学位论文

【摘要】：三维喷墨打印技术是增材制造技术的一个细分技术领域,因其具有灵活性好、目标性强、多材质一体式制造等优势而相对于其他增材制造方法更具活性。但因材料研发不成熟及设备造价昂贵等问题,限制其主要应用在生物医疗方面(如牙科、器官打印)。该技术面临的难题还很多,本课题主要针对适用于该技术的光固化型电子浆料的研发,做了以下三方面的研究,取得了一些进展:在不除氧、无气氛保护的条件下对环氧树脂进行丙烯酸化改性,直接合成了可光-热双重固化的环氧丙烯酸树脂,用红外光谱对合成树脂进行表征,证明得到了环氧丙烯酸酯。研究了丙烯酸用量、反应温度等因素对树脂涂膜柔韧性、抗冲击性、耐试剂性等物理性能的影响,发现丙烯酸和环氧基的摩尔比例及反应温度对树脂的性能有很大的影响,说明控制丙烯酸用量及反应温度的重要性。用红外光谱表征树脂在各个固化条件下的涂膜,结果证明对于所合成树脂用光固化辅以热固化的固化方式可以缩短固化时间并提高固化深度。结果表明,合理控制丙烯酸与环氧基的摩尔比例和反应温度,对树脂的固化性能及树脂固化膜的物理性能有较大的提高,尤其体现在树脂的硬度和柔韧性上,主要是由于丙烯酸用量及反应温度的差异会导致所得树脂的结构变化。将制得的光-热双重固化树脂和磁粉进行混合,制备不同配方的导磁浆料,研究了不同稀释剂剂量、不同触变剂剂量、磁粉添加量对浆料流变性、稳定性及光固化性能的影响规律,以及对固化薄膜的硬度和附着力的影响。结果表明,树脂:PGMEA的比例为1:2.5时,浆料粘度符合要求,性能最佳。在浆料触变性方面,对触变剂进行活化预分散,触变效果更加明显,对磁粉的承载作用更好,最佳用量为1%(wt)。磁粉固含量一直被提升到65%(wt),浆料的粘度仍符合打印要求,浆料固化膜的性能保持稳定,磁粉含量继续增加,固化膜性能将大幅下降。用阿基米德排水法和永磁特性测量仪测量了浆料固化件的密度和磁性能。结果表明,磁粉含量控制在合理的范围内有助于保证固化件的密实度。用不同性质的表面改性剂对磁粉进行了表面改性,再用所得改性磁粉进行磁性浆料的配制,用旋转流变仪分析浆料粘度和磁粉在浆料中分散效果,用扫描电镜分析浆料固化件中磁粉分散效果及磁粉和树脂的结合效果。结果表明,合理的表面改性剂选择,对磁粉在浆料中的分散效果、浆料的粘度及树脂固化膜密实度都有较大的提升,因每种改性剂对性能提升存在片面性,表面改性剂进行配合使用效果更佳。
[Abstract]:Three-dimensional inkjet printing technology is a subdivision of material augmentation manufacturing technology, because of its good flexibility and strong target. The advantages of multi-material integrated manufacturing are more active than other material adding methods. However, due to the immaturity of material research and development and the high cost of equipment, it is limited to be mainly used in biomedicine (such as dentistry). There are still a lot of difficulties in this technology. This paper mainly focuses on the research and development of light-cured electronic paste which is suitable for this technology, and has made some progress in the following three aspects: no oxygen removal. Epoxy acrylic resin which can be cured by light and heat was synthesized directly by acrylic modification of epoxy resin without atmosphere protection. The synthetic resin was characterized by infrared spectrum. The effects of the amount of acrylic acid and reaction temperature on the physical properties of resin film such as flexibility, impact resistance and reagent resistance were studied. It is found that the molar ratio of acrylic acid to epoxy group and reaction temperature have great influence on the properties of the resin. The importance of controlling the amount of acrylic acid and reaction temperature is explained. The coating film of resin under various curing conditions is characterized by infrared spectrum. The results show that the curing time and curing depth can be shortened and the curing depth can be improved by using the curing method of light curing and heat curing for the synthetic resin. The results show that the molar ratio of acrylic acid to epoxy group and the reaction temperature can be reasonably controlled. The curing properties of the resin and the physical properties of the resin curing film have been greatly improved, especially in the hardness and flexibility of the resin. It is mainly due to the difference in the amount of acrylic acid and the reaction temperature that the structure of the resin will change. The photo-thermal double curing resin and magnetic powder are mixed to prepare the magnetic conductive paste with different formulations. The effects of different diluent dosage, different thixotropic agent dosage and magnetic powder addition on rheology, stability and photocuring properties of the slurry, as well as the hardness and adhesion of the cured film were studied. When the ratio of resin to PGMEA is 1: 2.5, the viscosity of the paste meets the requirements and the performance is the best. In the thixotropy of the slurry, the thixotropic agent is activated and predispersed, and the thixotropic effect is more obvious. The bearing capacity of the magnetic powder is better, the optimum dosage is 1 wtl. The solid content of the magnetic powder has been raised to 65%, the viscosity of the slurry still meets the printing requirements, and the properties of the slurry curing film remain stable. The density and magnetic properties of the solidified parts were measured by Archimedean drainage method and permanent magnet characteristic measuring instrument. The control of magnetic powder content in a reasonable range is helpful to ensure the density of solidified parts. The surface modification of magnetic powder is carried out with different surface modifiers, and the modified magnetic powder is used to prepare magnetic paste. The viscosity of slurry and the dispersion effect of magnetic powder in slurry were analyzed by rotary rheometer, and the dispersion effect of magnetic powder and the binding effect of magnetic powder and resin in slurry solidified parts were analyzed by scanning electron microscope. Reasonable surface modifier selection, the dispersion effect of magnetic powder in the slurry, the viscosity of the slurry and the resin curing film density are greatly improved, because each modifier has one-sidedness to the performance improvement. The effect of surface modifier is better.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TB34

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