黄广华^1,3，陆有军²，潘志东³，王燕民^2,3

（1. 深圳职业技术学院 霍夫曼先进材料研究院博士后创新实践基地，广东 深圳 518055；2.北方民族大学 材料科学与工程学院，宁夏 银川 528138；3.华南理工大学 材料科学与工程学院，广东 广州 510640）

DOI：10.13732/j.issn.1008-5548.2023.02.018

收稿日期：2022-11-19，修回日期：2022-12-15，在线出版时间：2023-03-08 10:04。

基金项目：国家自然科学基金项目，编号：52072125；深圳职业技术学院博士后启动资金资助项目，编号：6021330017K。

第一作者简介：黄广华(1990—)，男，博士，研究方向为高分子分散剂在纳米材料中的应用。E-mail：Huangguanghua1990@szpt.edu.cn。

通信作者简介：王燕民(1956—)，男，教授，博士，博士生导师，研究方向为纳米材料的制备。E-mail：wangym@scut.edu.cn。

摘要：合成3种水性无规则共聚物分散剂(Ⅰ:PASG、 Ⅱ:PAI和Ⅲ:PSG)和2种水性嵌段分散剂(Ⅳ:PMAA-b-AMPS和Ⅴ:PSSS-b-GMA),并应用于制备水基铝酸钴(CoAl₂O₄)陶瓷墨水；采用比色法、激光粒度分析法、沉降法分别分析在添加不同分散剂时，亚微米粒级CoAl₂O₄颗粒在水性悬浮液中的颜色特性和分散稳定性；通过傅里叶变换红外光谱法、热重法、电动势法探究不同分散剂在CoAl₂O₄颗粒表面的吸附机理；通过流变仪、表面张力仪、静置沉降、离心沉降分析水基CoAl₂O₄陶瓷墨水的黏度、表面张力、稳定性；基于半经验法计算和分析水基CoAl₂O₄墨水在陶瓷生坯上的打印适应性。结果表明：在添加质量分数为5%、以质量比为9∶1混合的水性嵌段分散剂时，水基CoAl₂O₄陶瓷墨水中的色料颗粒表现出最佳分散稳定性；在水基CoAl₂O₄陶瓷墨水中加入质量分数为20%的二甘醇单丁醚(DG)可有效增加墨水的黏度，降低表面张力，且该水基CoAl₂O₄陶瓷墨水在陶瓷生坯上的打印适应性强。

关键词：水性嵌段分散剂;混合分散剂;分散;稳定;喷墨打印性能

Abstract：Three random copolymer dispersants(i.e., Ⅰ: PASG, Ⅱ: PAI and Ⅲ: PSG) and two diblock polymer dispersants(i.e., Ⅳ: PMAA-b-AMPS and Ⅴ: PSSS-b-GMA) were synthesized and used as water-based dispersants for dispersion and stabilization of waterborne ceramic inks with submicron-sized cobalt aluminate(CoAl₂O₄) pigment. The color property, dispersion, and stability of the pigment particles in aqueous suspension were determined by colorimetry and laser particle size analysis. The adsorption mechanism of carbon chains of dispersants on the particle surface was analyzed by Fourier transform infrared spectroscopy, thermogravimeter and electrokinetic potential measurement. Also, the viscosity, surface tension and stability of waterborne ceramic inks with the pigment particles were measured by rheometry, surface tension analysis and standing settlement. The results show that the submicron-sized pigment particles in waterborne ceramic inks show optimum dispersibility and stability at 5% addition of 2 diblock polymer dispersants mixed in a mass ratio of 9∶1. This is since the dispersant compound 2 can provide the more interparticle electrostatic repulsion and steric hindrance energies due to the proper adsorption of carbon chain in the functional group of the dispersants on the particle surfaces. It is indicated that adding 20% of diethylene glycol monobutyl ether(DG) into the waterborne ceramic inks can effectively increase the viscosity and reduce the surface tension, thus satisfying the applied requirements in inkjet printing. In addition,the jettability of waterborne ceramic inks on a simulated ceramic green body was also evaluated based on semi-empirical analysis. It is indicated that the waterborne ceramic ink prepared by this method has a promising application prospect.

Keywords：diblock polymer dispersant; mix dispersant; dispersion; stability; inkjetability

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