Preparation method of cross-linked amphoteric bagasse xylan

Abstract

The invention discloses a preparation method of cross-linked amphoteric bagasse xylan. By using bagasse xylan as the initial raw material, deionized water as a solvent, 3-chloro-2-hydroxypropyltrimethylammonium chloride as a cationic reagent, succinic anhydride as an anionic reagent, glyoxal as a cross-linking agent and 12-tungstophosphoric acid as a catalyst, the bagasse xylan is subjected to chemical modification by etherification, esterification and cross-linking to obtain the cross-linked amphoteric bagasse xylan. The product has multiple structures and characteristics of anionic xylan, cationic xylan, natural high molecular polymers and the like. After the cross-linking, the alocholic hydroxtyl group of the amphoteric xylan and the multielement functional group of the cross-linking agent form a diether bond or diester bond, or two or more amphoteric xylan molecules form a bridge, thereby forming the multidimensional network structure. Compared with bagasse xylan, the heat stability and hydrophobicity of the cross-linked amphoteric bagasse xylan prepared by the method disclosed by the invention are obviously improved; and compared with the single-modified xylan derivative, the cross-linked amphoteric bagasse xylan has better service performance.

Description

technical field [0001] The invention relates to a preparation method of cross-linked amphoteric bagasse xylan. Background technique [0002] Xylan is widely distributed in nature, second only to fiber, starch and other natural polymer compounds. It is a common component in higher plants and one of the main forms of carbohydrate storage. Its major advantage is Both biodegradable and renewable. Guangxi is an area rich in bagasse in China, and the content of xylan in bagasse is about 30%. With the increasing emphasis on renewable resources and green chemical industry, how to modify the natural xylan extracted from bagasse, introduce new functional groups, and increase and expand the use of xylan has become an important topic of increasing concern. It is a meaningful work to use xylan, a renewable resource, to study new chemical products with better performance and wider use. [0003] At present, most studies on the functional modification of xylan at home and abroad use xyla...

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Problems solved by technology

[0003] At present, most of the research on the functional modification of xylan at home and abroad uses xylan from birch, beech, corn cob and other sources as raw materials, and there are few reports on the modification of xylan from bagasse from agricultural and forestry waste.

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