How to Control the Flow Behavior of Coating Color for Coated Whiteboard

摘要：

The flow behavior of coating color plays an important role in the production process of coated paper and paperboard.Improving the flow behavior of pigment slurries leads to better high speed runnability and coverage and less blade trace.The steady shear flow of coated whiteboard pigment slurries has been achieved in the laboratory by adding plastic pigment,smaller particle size latex,and water-soluble CMC(Carboxymethyl Cellulose),and optimum dosage of dispersant and adjusting the pH value of coating formulation.The experimental results show that when adding less than 1.5 parts CMC into the top layer coating,more remarkable shear-thinning flow occurred even if under low shear range(0.1～398.141s-1).Smaller particle size latex substituting for average latex gave a lower apparent viscosity of approximate 25mPa.s at 104s-1,and no dilatant flow observed in the log-log plot of apparent viscosity vs.shear rate.Neutral plastic pigment replacing equivalent plate-like kaolin led to shear-dependent flow analogous to smaller particle size latex.Moreover,optimum levels of dispersant dosage from 0.2 to 0.3 parts and of pH value between 8.5～9.0 are usually adopted to improve the steady shear flow of coating colors and to avoid shear-thickening flow at high shear rate.

关键词： flow behavior shear rate shear-thinning shear-thickening apparent viscosity coated whiteboard CMC smaller particle size latex plastic pigment dispersant

作者: YANG RENDANG LI WEIWEI YANG FEI CHEN KEFU

作者单位: Guangdong Public Laboratory of Paper Technology and Equipment,State Key Laboratory of Pulp & Paper Engineering,Guangzhou,510641,China

会议类型: 国际会议

会议名称: 第二届国际造纸与环境学术会议(The Second International Papermaking & Environment Conference)

会议地点: 天津

会议语种:英文

页码: 847-850

在线出版日期: 2008-05-14（万方平台首次上网日期，不代表论文的发表时间）