Modified Egyptian Talc as Internal and Surface Treatments for Papermaking

Abstract

Mineral fillers have long been used in papermaking. In Egypt, talc has been used, without modifica-tion, as filler or coating for bleached rice straw pulp. For this study, talc was modified chemically with starch, car-boxymethyl cellulose, glycerol, dodecytrimethyammonium bromide, polyacrylamide and poly(vinyl alcohol). Talc is chemically inert; the modification was carried out to change the nature of the native talc. Researchers then studied the mechanical and optical properties for filled and coated papers. The results indicated that modified talc enhances the mechanical and optical properties for filled or coated handsheets. Scanning electron micrographs of the filled and coated sheets were investigated; results of the study showed that talc modification can improve filler-fiber-filler bond.

Encapsulation of precipitated calcium carbonate fillers using carboxymethyl cellulose /polyaluminium chloride: preparation and its influence on mechanical and optical properties of paper

“…Many efforts have been reported to alleviate or overcome the drawbacks related to filler addition, including fillers incorporating into the lumens and/or cell walls of pulp fibers (Klungness et al 2000), in situ precipitation of filler particles on fines/fibrils (Subramanian et al 2007, Subramanian et al 2008, using novel fillers such as starch-based biodegradable organic fillers, and fibrous/high-aspectratio inorganic fillers (Hu and Deng 2004, Mathur 2004, Mollaahmad 2008, Shen et al 2010, use of functional strengthening agents (Chen et al 2005, Fahmy and, fiber modification (Bratskaya et al 2006, Kang 2007, and filler modification (Gill 1992, Laleg et al 2008, Ibrahim et al 2009, Shen et al 2010, Marzbani et al 2016. In recent years, filler modification methods have been specially focusing on biodegradable and renewable carbohydrate polymers (such as starch, cellulose, and chitosan) as a promising procedure in papermaking (Yoon and Deng 2007, Zhao et al 2008, Nelson and Deng 2008, Shen et al 2009, Song et al 2009a, Song et al 2009b).…”

Preparation and property of poly(vinyl alcohol) grafted with butyl glycidyl ether

“…Surface treatment is applied by paper makers to improve quality of the paper 9, 10. PVA, as an internal or surface sizing agent in papermaking, can be joined with the wood pulp fibers and help to develop the bonded area between the fibers, and the specific forces such as hydrogen bonds holding the fibers together, which would facilitate to improve the strength of the paper product 11…”

Preparation of chitosan modified talc and its application in high filler content paper

“…Various methods have been explored to improve or alleviate the aforementioned limitations and drawbacks without sacrificing paper properties, such as the incorporation of fillers into lumen or cell‐wall,8 pulp fine‐filler composite,9–11 and preflocculation of filler 6, 12. However, poor compatibility between the inorganic filler and pulp fiber has a great influence on the pore structure of paper and the properties of high filler paper 5, 13. To overcome such problems, filler modification via surface treatment is one of the most promising methods for industrial applications.…”

“…To overcome such problems, filler modification via surface treatment is one of the most promising methods for industrial applications. Several surface modifiers have been researched, such as inorganic compounds,14 synthetic polymers or resin,15 surfactants,13 latex, and coupling agent 16…”