Applications of Nano-sericite to Coated Paper

• Main Authors: ming-jie liu, 劉明杰
• Other Authors: 彭元興
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/79328965066626134148

碩士 === 大葉大學 === 環境工程學系碩士班 === 98 === Abstract Taking advantage of the swelling nature of sericite, a mica mineral, in this study, we applied a nano-preparation of it as a coating color ingredient to papermaking. The preparation was also added to the coating binder, styrene butadiene resin (SBR) to modify its flow properties. Furthermore, we integrated the results of our lab findings in recent years to ascertain the role of nano-sericite in paper coating operations, and attempted to develop functional paper usages based on the results of its effects on coating color and coated papers. The purpose of the study was to understand the feasibility of applying nano-sericite to paper coating operations. The material was used both as a pigment ingredient, as a modifier of SBR, examined the heated performance of modified SBR, and investigated the rheological characteristics of coating color on the coating operations. The experimental results included an analysis of the coating color properties, optical and printability properties of the coated paper, and verified the feasibility of applying nano-sericite to paper coating uses. The color properties examined included the solids content, low- and high-shear viscosities, water retention value (WRV) and pH. The optical properties of the coated paper examined included the brightness, opacity, CIE L*a*b* values, gloss, smoothness and roughness; the printability properties examined included RI dry-peeling, wet-peeling strengths, and IGT printed gloss. The studied was conducted in 4 phases as described above. The results indicated that the WRV increased with the stepwise increments of nano-sericite addition; in other words, the water retained by the color decreased. In particular, the SBR-130 nm group had WRV increases significantly greater than did those of SBR-185 and SBR-120 nm groups. The low-shear viscosities of the colors also increased with increasing proportions of nano-sericite added. When nano-sericite was added as a pigment ingredient, at 1% dosage, its effects on WRV and low-shear viscosity were maximized. Overall, addition the swelling nano-sericite decreased the retained water in the color and coalesced pigment particles to cause increased low-shear viscosity. Key words: nano-sericite, coating, binder, optical properties, printability, styrene butadiene resin.