HUANG Guanghua^1,3, LU Youjun², PAN Zhidong³, WANG Yanmin^2,3

(1.Post Doctoral Innovation Practice Base of Hoffman Institute of Advanced Materials, Shenzhen Polytechnic, Shenzhen 518055, China;2.School of Materials Science and Engineering, North Minzu University, Yinchuan 528138, China;3.School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China)

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

Received：2022-11-19，Revised：2022-12-15,Online：2023-03-08 10:04。

Funding Project：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。

First Author：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。

Corresponding Author：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。