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Citation: YIN Qin-Wei, FU Shi-Yu, ZHAN Huai-Yu. Modification of Wheat Gluten and Its Application in Paper Making as Paper Strength Agent[J]. Chinese Journal of Applied Chemistry, ;2008, 25(1): 27-32. shu

Modification of Wheat Gluten and Its Application in Paper Making as Paper Strength Agent

1.
State Key Lab of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640

Corresponding author: FU Shi-Yu,
Received Date: 19 January 2007
Available Online: 22 March 2007
Fund Project: 广东省科技计划项目(2005B33302016)资助 (2005B33302016)

Wheat gluten,a kind of cheap and reproducible agricultural by-products,was modified to produce a new paper strength agent similar to polyamide polyamine epichlorohydrin(PPE) synthesized from petroleum resources.The modification reaction included hydroxymethylation of gluten and cationic activation with epichlorohydrin.The modified wheat gluten contains three kinds of functional groups,hydroxy-azetidinium,Chlorohydrin and epoxy groups.Those groups can bond with the fibers of pulp to form three-dimensional networks around the fibers,improving paper strength.The hydroxymethylation of gluten was carried on in the suspension of 5% gluten with 1% formic acid and 0.7% formaldehyde under 70℃,and then cationic activation with 8% epichlorohydrin under 60℃.The modified gluten carries cationic charges,which can increase the Zeta potential and retention of pulp slurry,and improve the physical properties of hand sheets.The gains of dry strength and wet strength of hand sheet were 35% and 20% respectively when 5% modified gluten was used in the pulp slurry.
- wheat gluten,
- hydroxymethylation,
- epichlorohydrin,
- wet-strength agent
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