Huang Guanghua, Wu Haohan, Liu Zhijun, Hu Hanlin, Guo Shifeng
Hoffmann Institute of Advanced Materials, Shenzhen Polytechnic, 7098 Liuxian Blvd, Nanshan District, Shenzhen 518055, China.
Shenzhen Key Laboratory of Smart Sensing and Intelligent Systems, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, 1068 Xueyuan Avenue, Shenzhen University Town, Shenzhen 518055, China.
Materials (Basel). 2023 Feb 2;16(3):1287. doi: 10.3390/ma16031287.
Three sodium polyacrylate copolymers PD0x (Poly acrylic acid-co-sodium 4-vinylbenzenesulfonate or PD01; Poly acrylic acid-co-sodium 4-vinylbenzenesulfonate-co-hydroxyethyl methacrylate or PD02 and Poly methyl methacrylate-co-acrylic acid-co-sodium 4-vinylbenzenesulfonate-co-hydroxyethyl methacrylate or PD03) were synthesized as water-based dispersants for grinding red-brown pigment ZnFeCrO particles prepared by the solid phase method (S-ZnF). The particle size distribution, viscosity of suspensions, and adsorption capacity of dispersants were explored by laser particle size analysis, viscometer, and thermogravimetry (TG), respectively. The application of 2 wt.% dispersant PD02 in the S-ZnF suspension ground for 90 min can deliver a finer product with the narrower particle size distribution. The added dispersant PD02 in the grinding process of the S-ZnF particles exhibits a suitable viscosity of the suspension and generates more hydrogen bonds on the S-ZnF particle surface. The sulfonic acid groups (SO) and carboxylic acid groups (-COO) in the dispersant PD02 can also provide a strong charge density, which is favorable for the dispersion and grinding of the S-ZnF particles in the suspensions. Furthermore, the adsorption behavior of polymeric dispersant PD02 adsorbed on the S-ZnF particles surface was simulated and analyzed by adsorption thermodynamic models and adsorption kinetic models. It is indicated that the adsorption thermodynamic behavior of dispersant PD02 adsorbed on the S-ZnF particles surface follows the Langmuir model, and the adsorption process is endothermic and a random process with increased confusion during the grinding process. In addition, the adsorption kinetics of dispersant PD02 adsorbed on the S-ZnF particles surface are more in line with the pseudo-first-order kinetic models. Therefore, the adsorption process of dispersant PD02 on the S-ZnF particles surface can be considered as a single-surface adsorption process.
合成了三种聚丙烯酸钠共聚物PD0x（聚丙烯酸 - 4 - 乙烯基苯磺酸钠共聚物或PD01；聚丙烯酸 - 4 - 乙烯基苯磺酸钠 - 甲基丙烯酸羟乙酯共聚物或PD02；聚甲基丙烯酸甲酯 - 丙烯酸 - 4 - 乙烯基苯磺酸钠 - 甲基丙烯酸羟乙酯共聚物或PD03），用作水基分散剂，用于研磨通过固相法制备的红棕色颜料ZnFeCrO颗粒（S - ZnF）。分别通过激光粒度分析、粘度计和热重分析（TG）研究了分散剂的粒度分布、悬浮液粘度和吸附容量。在研磨90分钟的S - ZnF悬浮液中添加2 wt.%的分散剂PD02，可以得到粒度分布更窄的更细产品。在S - ZnF颗粒的研磨过程中添加的分散剂PD02表现出合适的悬浮液粘度，并在S - ZnF颗粒表面产生更多氢键。分散剂PD02中的磺酸基团（SO）和羧酸基团（-COO）也可以提供强大的电荷密度，这有利于S - ZnF颗粒在悬浮液中的分散和研磨。此外，通过吸附热力学模型和吸附动力学模型对聚合物分散剂PD02吸附在S - ZnF颗粒表面的吸附行为进行了模拟和分析。结果表明，分散剂PD02吸附在S - ZnF颗粒表面的吸附热力学行为遵循朗缪尔模型，吸附过程是吸热的，并且在研磨过程中是一个混乱度增加的随机过程。此外，分散剂PD02吸附在S - ZnF颗粒表面的吸附动力学更符合准一级动力学模型。因此，分散剂PD02在S - ZnF颗粒表面的吸附过程可以被视为单表面吸附过程。
