改性聚丙烯酸分散剂在研磨镨掺杂硅酸锆色料中的应用  

Ultrafine Grinding of Praseodymium Zirconium Silicate Pigment with Water-based Hydroxyl Modified Dispersants

作　　者：黄广华 潘志东[1] 王燕民[1] HUANG Guanghua;PAN Zhidong;WANG Yanmin(School of Materials Science and Engineering,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]华南理工大学材料科学与工程学院

出　　处：《硅酸盐学报》2019年第12期1776-1783,共8页Journal of The Chinese Ceramic Society

基　　金：广东省应用型科技研发专项资金(2015B090927002);佛山市重大科技项目(2016AG101415);中国博士后科学基金项目(2017M622685)

摘　　要：以合成的改性聚丙烯酸钠(PASHS,聚丙烯酸-2-丙烯酰胺-2-甲基丙磺酸-甲基丙烯酸羟乙酯)作为水基分散剂,采用一种高能量密度介质搅拌磨研磨制备亚微米级的镨掺杂硅酸锆或镨黄(Pr-ZrSiO4)陶瓷色料。利用激光粒度仪表征了研磨后镨黄颗粒粒度及其粒度分布,并采用Fourier变换红外光谱,热重法和Zeta电位测量分析了分散剂在镨黄颗粒表面的吸附机理。结果表明,对比未改性分散剂(PAS,聚丙烯酸-2-丙烯酰胺-2-甲基丙磺酸),在2%改性分散剂PASH1和固体含量35%时,经研磨90 min后,可得到粒度较细(d50=334 nm)且粒度分布较窄(n=2.61)的镨黄颗粒产品。这归因于有效吸附在镨黄颗粒表面的具有合适分子量的改性分散剂PASH1可使颗粒间产生较强的空间位阻与静电排斥效应,降低了浆料的黏度,从而有效地分散和研磨颗粒。此外,还通过粒数衡算模型(Population Balance Model)求解得到的选择函数和破碎函数模拟和分析了当分别添加分散剂PASH1和PAS时镨黄颗粒在搅拌磨研磨过程中的破碎行为。分析表明:改性聚丙烯酸分散剂PASH1具有较好的分散助磨效果,且当添加改性分散剂PASH1时,颗粒主要因挤压和剪切应力而粉碎。Aqueous suspension of submicron-sized praseodymium-doped zirconium silicate(Pr-ZrSiO4)pigment was prepared in a high energy-density stirred bead mill with sodium polyacrylate copolymers(i.e.,poly acrylic acid-co-2-acrylamide-2-methyl propane sulfonic acid-co-hydroxyethyl methacrylate or PASHS)synthesized with acrylic acid-co-2-acrylamido-2-methylpropanesulfonic acid(PAS)as water-based dispersants.The product size/size distribution was determined by laser particle size analysis,and the adsorption behavior of copolymer dispersants on the particle surface was characterized by Fourier transform infrared spectroscopy,thermo-gravimetry and Zeta potential measurement,respectively.Compared to dispersant PAS,dispersant PASH1 with a proper molecular weight at 2% addition in the suspension ground for 90 min can give a finer product(d50=334 nm)with a narrower particle size distribution(n=2.61).Dispersant PASH1 used in grinding is more likely to interact to the particle surface and generates more hydrogen bonds on the particle surface.In addition,the selection and breakage functions from the population balance model were also calculated to analyze the breakage behavior of the particles in the mill in the presence of dispersants PASH1 and PAS.It is indicated that modified acrylic dispersant PASH1 has a more efficient dispersive effect on the ultrafine grinding,and the particles are mainly fractured by compressive and abrasive stresses when dispersant PASH1 is used.

关 键 词：水基分散剂 超细研磨 粒度分布 吸附 粒数衡算模型 破碎机制 

分 类 号：TQ620.1[化学工程—精细化工]