Study On Preparation And Properties Of Polymer Ceramic Dispersant

In the ceramic industry, the quality and efficiency of ceramics is enhanced by adding dispersant to the slurry. Polymer dispersant has been got attention by people for its excellent performance. The action mechanism is space steric effect and electrostatic effect.According to the action mechanism and structure design principle, the amphoteric, cationic and anionic dispersant were synthesized by using hydroxyethyl cellulose, dimethyl diallyl ammonium chloride and acrylic acid as material. The optimum reaction conditions was determined by orthogonal experiment. The infrared spectrograms and DTA-TG curves of the copolymer were tested. The effects of addition quantity and pH on the dispersion of kaolin slurry were investigated. The dispersion of particles was observed by SEM. The three dispersants were applied to knar clay, the effect on plasticity and bending strength were disscused in comparison with inorganic dispersant.The results show that the flowing time of kaolin slurry with amphoteric dispersant is 46s. It has been reduced by 38.7% compared to inorganic dispersant and the thickening degree is 1.2 when the addition quantity is 0.2%. The plasticity and bending strength of knar clay body respectively is 0.247 and 16MPa. The flowing time of kaolin slurry with cationic dispersant is 57s. It has been reduced by 24% compared to inorganic dispersant and the thickening degree is 1.25 when the addition quantity is 0.4%. The plasticity and bending strength of knar clay body respectively is 0.233 and 14.36MPa. The flowing time of kaolin slurry with anionic dispersant is 33.6s. It has been reduced by 55.2% compared to inorganic dispersant when the addition quantity is 0.05%. The plasticity and bending strength of knar clay body is 0.343 and 40.88MPa respectively. By comparison, the three polymer dispersants are new type, multi-functional additives which exhibit better properties than inorganic dispersant, in which the anionic dispersant is the optimal. The synthesis method is simple, and no waste solid and water are generated in the process of preparation.