三维打印快速成型石膏聚氨酯基粉末材料及后处理研究

发布时间：2018-03-01 22:13

本文关键词： 三维打印石膏基后处理液聚氨酯热熔胶粉　出处：《华南理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：三维打印快速成型技术是一种采用喷墨印刷技术与粉末材料作用的快速成型技术。具有材料广泛、成型过程简单、无污染、可打印彩色模具等优点,可应用于工业模具、医学、建筑等领域。本文研制了一种可用于3DP技术的石膏基粉末配方。选取石膏作为粉末成型材料的主要成分,选用Si O2粉末对其进行混合改性,改善了石膏粉末的分散性,提高了铺粉效果;采用均匀设计试验得到了石膏基粉末的优化配方为:石膏83.7%,PVA 12.6%,二氧化硅0.5%,氧化铝3.2%。使用该粉末,与水基粘结液配合上机打印,打印过程流畅,打印器件抗压强度为1.95 MPa。同时,总结了在研究粉末打印成型过程中遇到的问题,并对打印器件出现的缺陷及其原因进行了分析。由于打印器件机械强度不佳,本文提出通过浸泡后处理A、B液的方法来提高打印器件性能。并分析了不同的填充强化剂(后处理A液),不同的后处理B液基料,后处理B液中水性环氧乳液的掺量及后处理液浸泡时间对石膏基打印器件的耐水性、抗压强度、尺寸偏差、表面微观结构的影响。后处理A、B液最佳浸泡时间分别为130 s和35 s;先浸泡后处理A液,后浸泡后处理B液的打印器件具有抗压强度高、吸水率小、表面较光滑、不脱粉等优良性能。最后,本文对石膏-聚氨酯基粉末进行了探索研究,分析了成型粉末中热塑性聚氨酯热熔粉的添加量对打印器件表面结构、尺寸偏差、密度、孔隙率、吸水率及机械强度的影响。结果表明TPU粉含量从20%增加到70%,打印器件的密度从2.12 g/cm3降低到1.38 g/cm3;孔隙率从32.5%减少到16.7%;打印器件抗压强度从1.82 MPa先有较小的降低,后增加至3.74 MPa,拉伸强度从0.22 MPa增加到1.35 MPa。
[Abstract]:3D printing rapid prototyping is a kind of rapid prototyping technology which uses inkjet printing technology and powder material. It has the advantages of wide material, simple molding process, no pollution, color printing mould and so on. It can be used in industry mould, medicine, etc. In this paper, a gypsum powder formula for 3DP technology was developed. Gypsum was selected as the main component of powder forming material, and Sio 2 powder was mixed to modify the powder, which improved the dispersion of gypsum powder. The optimized formula of gypsum based powder is: gypsum 83.7% PVA 12.66, silica 0.5, alumina 3.2%. The powder is printed with water-based binder, and the printing process is smooth. The compressive strength of the printing device is 1.95 MPA. At the same time, the problems encountered in the study of powder printing molding are summarized, and the defects of the printing device and its causes are analyzed. In this paper, we propose a method to improve the performance of printing devices by soaking and treating AZB solution, and analyzing different filling and strengthening agents (post-treatment A liquid, different post-treated B liquid base material, etc.). The content of waterborne epoxy emulsion in post-treatment B solution and the soaking time of post-treatment liquid to the water resistance, compressive strength and dimension deviation of gypsum based printing device, The effect of surface microstructure on the surface microstructure. The optimum immersion time of post-treated AZB solution was 130s and 35s, respectively. The printing device with first soaking and then treated B solution had high compressive strength, low water absorption and smooth surface. Finally, this paper studies the gypsum-polyurethane based powder, and analyzes the effect of the amount of thermoplastic polyurethane hot melt powder on the surface structure, dimension deviation, density, porosity of the printing device, and the effect of the content of the thermoplastic polyurethane hot melt powder on the surface structure, dimension deviation, density, porosity, etc. The results show that the density of printing devices decreases from 2.12 g / cm ~ 3 to 1.38 g / cm ~ (3), the porosity decreases from 32.5% to 16.7, and the compressive strength of printing devices decreases from 1.82 MPa to 1.82 MPa, the results show that the content of TPU powder increases from 20% to 70 and the density of printed devices decreases from 2.12 g / cm ~ 3 to 1.38 g / cm ~ (3). The tensile strength increased from 0.22 MPa to 1.35 MPA.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB383.3;TP391.73

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