A kind of method for oxidative degumming of ramie by utilizing selective oxidant

Abstract

The invention provides a method for carrying out oxidation degumming on ramie by utilizing a selective oxidant. The method comprises the following steps of: firstly screening a selective oxidation system, preparing a degumming solution, mixing raw ramie and the degumming solution, and regulating an initial pH value of the degumming solution; putting a reactor in a constant-temperature water bath, stirring, rising the temperature, maintaining the temperature, regulating the pH value of a reaction system in real time, and fully removing gum in the raw ramie by utilizing the oxidizability of the selective oxidation system; and taking out degummed refined dried ramie from the reaction system, washing, extruding oil, then rolling and drying, putting into a baking oven for drying, opening and combing, and finally obtaining dispersed refined dried ramie fiber. The method provided by the invention has the advantages that the novel oxidation system is selected for carrying out oxidation degumming on the ramie, the oxidation reaction is mildly carried out, the gum components in the raw ramie are fully removed, simultaneously the depolymerization of macromolecular chains of cellulose is inhibited, and the excessive oxidation of the cellulose is inhibited, so that the quality of the ramie fiber is improved, the waste of medicines and the consumption of energy are reduced, the time and cost are saved, and the best degumming effect is achieved.

Description

Technical field [0001] The invention relates to a method for oxidative degumming of ramie by using a selective oxidant, and belongs to the technical field of natural fiber preparation and selective oxidant application in the textile field. Background technique [0002] Cellulose is the most abundant renewable natural resource in nature. As the world pays more and more attention to environmental pollution and resource shortage, natural polymer materials with biodegradability and environmental coordination have become a hot spot for development. . Among all kinds of plant fibers, ramie is a kind of hemp fiber with excellent quality. Its fiber is slender and tough. It also has the characteristics of antibacterial and antibacterial, deodorizing absorption, moisture absorption, breathability, and mildew resistance. It is praised by the world as " Chinese grass". The main components of hemp fiber include cellulose, hemicellulose, pectin, lignin, fat wax, water-soluble matter, and ash...

AI Technical Summary

Problems solved by technology

However, general oxidants (such as hydrogen peroxide, sodium percarbonate, etc.) have relatively strong oxidizing properties. While removing colloids, they can randomly oxidize the hydroxyl groups on each carbon atom of cellulose, resulting in β elimination reactions. The degree of degradation and oxidation cannot be reasonably controlled, and the cellulose macromolecules are strongly degraded, so the indicators such as the strength and elongation of the final refined hemp fiber are relatively poor.