凹凸棒土对石膏3D打印材料基本性能和可打印性能的影响  

Influence of Attapulgite Clay on Basic Properties and Printability of Gypsum 3D Printing Materials

作　　者：汪才峰 蹇守卫[1] 李宝栋 黄健翔 高欣 马逍遥 薛文浩 WANG Caifeng;JIAN Shouwei;LI Baodong;HUANG Jianxiang;GAO Xin;MA Xiaoyao;XUE Wenhao(State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学硅酸盐建筑材料国家重点实验室,武汉430070

出　　处：《硅酸盐通报》2024年第5期1748-1755,共8页Bulletin of the Chinese Ceramic Society

基　　金：湖北省重点研发计划(2021BCA153)。

摘　　要：增稠剂是3D打印材料的关键组分,但常用的增稠剂以有机物为主,会降低石膏的力学性能。为此,本文选取了凹凸棒土与羟丙基甲基纤维素醚作对比,测试了凹凸棒土对石膏3D打印材料工作性能、力学性能以及实际打印性能的影响。结果表明:与羟丙基甲基纤维素醚相似,凹凸棒土降低了石膏3D打印材料的流动度,增加了动态屈服应力;随凹凸棒土掺量增加,材料抗折抗压强度先降低后增加,而羟丙基甲基纤维素醚组抗折、抗压强度则呈下降趋势;在实际打印中,凹凸棒土组体积稳定性和开放时间结果与羟丙基甲基纤维素醚组相似,实际打印强度高于羟丙基甲基纤维素醚组23%以上。羟丙基甲基纤维素醚通过吸水溶胀、分子缠绕来提高浆体的黏度,而凹凸棒土具有丰富的孔结构,在浆体中以氢键和范德瓦耳斯力吸附水分子和增稠石膏颗粒。Thickener is a crucial component in 3D printing materials.However,commonly used thickeners are predominantly organic matter,leading to a reduction in the mechanical performance of gypsum.In order to solve this issue,attapulgite clay and hydroxypropyl methylcellulose ether were compared to test their effects on the workability performance,mechanical performance,and printability of gypsum 3D printing materials.The results show that,attapulgite clay reduces the fluidity of gypsum 3D printing materials and increases dynamic yield stress,similar to hydroxypropyl methyl cellulose ether.The flexural and compressive strength of the material decreases first and then increases as the attapulgite clay content increases,while the flexural and compressive strength of the hydroxypropyl methylcellulose ether group shows a declining trend.In the actual 3D printing process,the volume stability and open time results of attapulgite clay groups are similar to those of the hydroxypropyl methylcellulose ether groups,but the actual printing strength is more than 23%higher than that of the hydroxypropyl methylcellulose ether groups.Hydroxypropyl methylcellulose ether achieves viscosity enhancement by water absorption and molecular entanglement,whereas attapulgite clay,with its abundant pore structure,thickens the slurry by adsorbing water molecules and gypsum particles through hydrogen bonding and Van der Waals forces.

关 键 词：高强石膏 3D打印 无机增稠剂 凹凸棒土 工作性能 可打印性 

分 类 号：TQ177.373[化学工程—硅酸盐工业]