采用水性嵌段高分子分散剂制备水基铝酸钴陶瓷墨水及其喷墨打印性能

Preparation and inkjet-ability of waterborne cobalt aluminate ceramic ink using water-based block polymer dispersant

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(CoAl_(2)O_(4))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CoAl_(2)O_(4)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CoAl_(2)O_(4)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CoAl_(2)O_(4)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CoAl_(2)O_(4)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CoAl_(2)O_(4)陶瓷墨水中的色料颗粒表现出最佳分散稳定性;在水基CoAl_(2)O_(4)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CoAl_(2)O_(4)陶瓷墨水在陶瓷生坯上的打印适应性强。

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(CoAl_(2)O_(4)) 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.