title: Synthesis of oxidized guar gum by dry method and its application in reactive dye printing.
abstract: The aim of this study was to prepare oxidized guar gum with a simple dry method, basing on guar gum, hydrogen peroxide and a small amount of solvent. To obtain a product with suitable viscosity for reactive dye printing, the effects of various factors such as the amount of oxidant and solvent, reaction temperature and time were studied with respect to the viscosity of reaction products. The product was characterized by Fourier transform infrared spectroscopy, size exclusion chromatography, scanning electron microscopy and differential scanning calorimetry. The hydrated rate of guar gum and oxidized guar gum was estimated through measuring the required time when their solutions (1%, w/v) reached the maximum viscosity. The effects of the salt concentration and pH on viscosity of the resultant product were studied. The mixed paste containing oxidized guar gum and carboxymethyl starch was prepared and its viscosity was determined by the viscometer. The rheological property of the mixed paste was appraised by the printing viscosity index. In addition, the applied effect of mixed paste in reactive dye printing was examined by assessing the fabric stiffness, color yield and sharp edge to the printed image in comparison with sodium alginate. And the results indicated that the mixed paste could partially replace sodium alginate as thickener in reactive dye printing. The study also showed that the method was low cost and eco-friendly and the product would have an extensive application in reactive dye printing.
authors.affiliation: Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, State Key Laboratory of Applied Organic Chemistry and Department of Chemistry, Lanzhou University, Lanzhou, 730000, PR China.
authors.forename: Honghong
authors.initials: H
authors.lastname: Gong
authors.forename: Mingzhu
authors.initials: M
authors.lastname: Liu
authors.forename: Bing
authors.initials: B
authors.lastname: Zhang
authors.forename: Dapeng
authors.initials: D
authors.lastname: Cui
authors.forename: Chunmei
authors.initials: C
authors.lastname: Gao
authors.forename: Boli
authors.initials: B
authors.lastname: Ni
authors.forename: Jiucun
authors.initials: J
authors.lastname: Chen
mesh_terms: D000464:Alginates / Q000737:chemistry; D002152:Calorimetry, Differential Scanning; D002850:Chromatography, Gel; D004396:Coloring Agents / Q000737:chemistry*; D005685:Galactans / Q000737:chemistry*; D020723:Glucuronic Acid / Q000737:chemistry; D055772:Green Chemistry Technology; D006603:Hexuronic Acids / Q000737:chemistry; D006861:Hydrogen Peroxide / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D008351:Mannans / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D010084:Oxidation-Reduction; D053149:Plant Gums / Q000737:chemistry*; D011327:Printing / Q000379:methods*; D012212:Rheology; D012492:Salts / Q000737:chemistry; D012995:Solubility; D017550:Spectroscopy, Fourier Transform Infrared; D013213:Starch / Q000031:analogs & derivatives / Q000737:chemistry; D014783:Viscosity
chemical_list: D000464:Alginates; D004396:Coloring Agents; D005685:Galactans; D006603:Hexuronic Acids; D008351:Mannans; D053149:Plant Gums; D012492:Salts; D020723:Glucuronic Acid; D013213:Starch; C034848:carboxymethyl starch; D006861:Hydrogen Peroxide; C007894:guar gum