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

An oxidative degumming and selective technology, applied in the direction of chemical production of bast fibers, etc., can solve the problems of unreasonable control of fiber degradation degree and oxidation degree, strong degradation of cellulose macromolecules, and poor strength and elongation of lean hemp fibers. , to achieve the effect of saving energy and chemical consumption, important theoretical significance and application value, and ensuring quality

Inactive Publication Date: 2019-04-09
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 elimin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A method for oxidative degumming of ramie using selective oxidants is as follows:

[0028] Mix 1.2 kg of sodium periodate, 0.4 kg of sodium tripolyphosphate, 0.2 kg of urea, 0.2 kg of sodium benzoate, and 98.0 kg of water to prepare a degumming solution (the mass ratio of raw ramie and degumming solution is 1:10). Dip 10 kg of ramie raw material into the degumming solution, adjust the pH value of the degumming solution to 8.0 with a 0.1 mol / L NaOH solution, and continuously stir the mixture of the ramie raw material and the degumming solution with a magnetic stirrer at a speed of 100 rpm. The temperature is increased from room temperature, and the temperature is increased to 90°C within 30 minutes at a rate of 5°C / min. The temperature is kept at this temperature for 60 minutes to fully remove the gum in the raw ramie by using the oxidizing property of the selective oxidation system. Fix the electrode of the pH meter and insert it into the middle of the reactor, so that it ...

Embodiment 2

[0032] A method for oxidative degumming of ramie using selective oxidants is as follows:

[0033] Mix 0.9 kg of tetramethylpiperidine oxide-sodium hypochlorite-sodium bromide ternary composite oxidation system, 0.6 kg of ammonium lauryl sulfate, 0.4 kg of copper ethylene diamine, 0.4 kg of polyacrylamide, and 197.7 kg of water. Degumming solution (the mass ratio of raw ramie and degumming solution is 1:20). Dip 10 kg of ramie raw material into the degumming solution, adjust the pH value of the degumming solution to 12.0 with a 0.1 mol / L NaOH solution, and continuously stir the mixture of the ramie raw material and the degumming solution with a magnetic stirrer at a speed of 300 rpm. The temperature is increased from room temperature, and the temperature is increased to 50°C within 30 minutes at a rate of 1°C / min. The temperature is kept at this temperature for 120 minutes. The oxidizing property of the selective oxidation system is used to fully remove the gum in the raw ramie. ...

Embodiment 3

[0035] A method for oxidative degumming of ramie using selective oxidants is as follows:

[0036] Add 0.3 kg of nitric acid-phosphoric acid-sodium nitrite oxidation system, 0.05 kg of polysorbate, 0.1 kg of thiourea, 0.05 kg of sodium citrate, and 45.5 kg of water to make a degumming solution (the mass ratio of raw ramie and degumming solution is 1 : 5). Dip 10 kg of ramie raw material into the degumming solution, adjust the pH of the degumming solution to 2.0 with a 0.1 mol / L HCl solution, and continuously stir the mixture of the ramie raw material and the degumming solution with a magnetic stirrer at a speed of 200 rpm. The temperature is increased from room temperature, and the temperature is increased to 100°C within 60 minutes at a rate of 2°C / min. The temperature is kept at this temperature for 40 minutes to fully remove the gum in the raw ramie by using the oxidizing property of the selective oxidation system. Fix the electrode of the pH meter and insert it into the middl...

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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...

Claims

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Application Information

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IPC IPC(8): D01C1/02
CPCD01C1/02
Inventor 李召岭丁彬俞建勇沈家力
Owner DONGHUA UNIV
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