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硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (6): 1979-1986.

• 3D 打印其他类材料 • 上一篇    下一篇

高强石膏3D打印浆体材料的制备与性能研究

黄彦敏, 毛岩鹏, 王旭江, 李敬伟, 王文龙, 马怡荻   

  1. 山东大学能源与动力工程学院,燃煤污染物减排国家工程实验室,济南 250061
  • 收稿日期:2021-04-01 修回日期:2021-05-14 出版日期:2021-06-15 发布日期:2021-07-08
  • 通讯作者: 毛岩鹏,博士,副教授。E-mail:maoyanpeng@sdu.edu.cn
  • 作者简介:黄彦敏(1997—),男,硕士研究生。主要从事α型半水石膏材料的研究。E-mail:1293237624@qq.com
  • 基金资助:
    国家重点研发计划(2017YFC0703100)

Preparation and Properties of α-Hemihydrate Gypsum 3D Printing Slurry Material

HUANG Yanmin, MAO Yanpeng, WANG Xujiang, LI Jingwei, WANG Wenlong, MA Yidi   

  1. National Engineering Laboratory for Reducing Emissions from Coal Combustion, School of Energy and Power Engineering,Shandong University, Jinan 250061, China
  • Received:2021-04-01 Revised:2021-05-14 Online:2021-06-15 Published:2021-07-08

摘要: 使用预先混合的高强石膏浆体材料进行3D打印的工艺具有制品强度高、打印周期短等优点,但仍存在石膏初凝时间过短、浆体可堆叠性不足等问题。在此基础上研究了植物蛋白类缓凝剂和多聚磷酸盐缓凝剂对材料抗压强度、流动性和可打印时间的影响,并研究了增塑剂羟丙基甲基纤维素醚(HPMC)对浆体流变性能和3D打印构件体积稳定性的影响。结果表明,两种缓凝剂对石膏水化的延缓机理不同,植物蛋白类缓凝剂可以延长流动度的稳定时期,多聚磷酸盐缓凝剂则不能很好地增加可打印时间,浆体在初凝前8~12 min就已失去流动性。HPMC的加入可显著提升浆体材料的表观粘度和屈服应力并消除缓凝剂造成的泌水现象,但对塑性粘度增幅不大,且会降低材料的抗压强度。高HPMC掺量下的高强石膏3D打印构件的体积稳定性较好,在0.020%(质量分数)植物蛋白类缓凝剂和0.60%(质量分数)HPMC掺量下3D打印构件的体积变形率为0.09。

关键词: 高强石膏, 3D打印材料, 缓凝剂, 增塑剂, 流动性, 流变性能

Abstract: The process of using pre-mixed α-hemihydrate gypsum slurry material for 3D printing has the advantages of high product strength and short printing cycle. However, there are problems such as short initial setting time of the gypsum and insufficient buildability of the slurry. On this basis, the effects of plant protein retarder and polyphosphate retarder on the compressive strength, fluidity and printable time of the material were studied. And the effect of the hydroxypropyl methylcellulose ether (HPMC) on the rheological properties of the slurry and the volume stability of 3D printed components was also studied. The results show that the two kinds of retarders have different mechanisms for retarding gypsum hydration. Plant protein retarders can extend the stable period of fluidity, while polyphosphate retarders cannot increase the printable time well. The slurry with polyphosphate retarder has lost its fluidity before the initial setting 8 min to 12 min. The addition of HPMC significantly increases the apparent viscosity and yield stress of the slurry material and eliminates the bleeding caused by the retarder, but it has little effect on the plastic viscosity and it reduces the compressive strength of the material. The α-hemihydrate gypsum 3D printed component with high HPMC content has good volume stability, and the volume deformation rate of the 3D printing component with 0.020% (mass fraction) plant protein retarder and 0.60% (mass fraction) HPMC is 0.09.

Key words: α-hemihydrate gypsum, 3D printing material, retarder, plasticizer, fluidity, rheological property

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