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Regulative method for free radical generation in ramie oxidation and degumming process

A technology of oxidative degumming and free radicals, which is applied in the direction of producing bast fiber by chemical method, which can solve the problems of glycosidic bond breaking, cellulose polymerization degree decrease, strength, elongation at break, softness and hand feeling performance deterioration, etc. , to achieve the effect of reducing the degradation of cellulose macromolecules, reducing cellulose damage, and excellent degumming effect

Inactive Publication Date: 2017-05-10
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, HO and HOO have strong oxidative abilities. If the operating conditions of the degumming process are not properly controlled, peroxides will decompose rapidly under alkaline conditions, and a large number of free radicals will be generated in a short period of time, which will cause β-elimination of cellulose. The reaction causes the glycosidic bond to be broken, resulting in a decrease in the degree of polymerization of cellulose, affecting the physical and mechanical properties of dry hemp, resulting in deterioration of its strength, elongation at break, softness and hand feeling, and affecting subsequent spinnability and processing. sex

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for regulating the generation of free radicals in the process of oxidative degumming of ramie is as follows:

[0030] 1.0 kg of hydrogen peroxide, 0.4 kg of sodium salicylate, 0.2 kg of sodium sulfamate, 0.3 kg of urea, 0.1 kg of sodium dodecylbenzenesulfonate, and 98.0 kg of water were added to form a degumming solution. Dip 10 kg of ramie raw material into the degumming solution. Start to heat up from room temperature, rise to 70°C within half an hour, keep at this temperature for 60 minutes, and fully remove the colloid. Remove the degummed degummed hemp from the reaction system, wash it repeatedly with clean water, then apply oil with a mass concentration of 1.5% for 2 hours, then dry it, put it in an oven at 100°C for 4 hours, and use a silk spinning opener to dry it. Open and comb to obtain dispersed lean hemp fibers. The fineness of the fiber is tested by the mid-end cutting method, the fiber strength is tested by the bundle fiber strength instrument, ...

Embodiment 2

[0034] A method for regulating the generation of free radicals in the process of oxidative degumming of ramie is as follows:

[0035] 0.8 kg of urea peroxide, 0.3 kg of sodium citrate, 0.3 kg of tetramethylbenzoquinone, 0.2 kg of thiourea, 0.1 kg of sodium lauryl sulfate, and 98.3 kg of water were added to form a degumming solution. Dip 10 kg of ramie raw material into the degumming solution. Start to heat up from room temperature, rise to 80°C within half an hour, keep at this temperature for 150 minutes, and fully remove the colloid. Remove the degummed degummed hemp from the reaction system, wash it repeatedly with clean water, then apply oil with a mass concentration of 1.5% for 2 hours, then dry it, put it in an oven at 100°C for 4 hours, and use a silk spinning opener to dry it. Open and comb to obtain dispersed lean hemp fibers. The fineness of the fiber is tested by the mid-end cutting method, the fiber strength is tested by the bundle fiber strength instrument, the ...

Embodiment 3

[0037] A method for regulating the generation of free radicals in the process of oxidative degumming of ramie is as follows:

[0038]1.0 kg of sodium percarbonate, 0.3 kg of sodium benzoate, 0.1 kg of crotonic acid, 0.2 kg of dimethyl sulfoxide, 0.15 kg of polyvinyl alcohol, and 98.25 kg of water were added to form a degumming solution. Dip 10 kg of ramie raw material into the degumming solution. Start to heat up from room temperature, rise to 85°C within half an hour, keep at this temperature for 90 minutes, and fully remove the colloid. Remove the degummed degummed hemp from the reaction system, wash it repeatedly with clean water, then apply oil with a mass concentration of 1.5% for 2 hours, then dry it, put it in an oven at 100°C for 4 hours, and use a silk spinning opener to dry it. Open and comb to obtain dispersed lean hemp fibers. The fineness of the fiber is tested by the mid-end cutting method, the fiber strength is tested by the bundle fiber strength instrument, t...

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Abstract

The invention provides a regulative method for free radical generation in a ramie oxidation and degumming process. Firstly, peroxide, a peroxide stabilizer, a radical scavenger, a fiber sweller, a surfactant and distilled water are prepared to form a degumming liquid; original ramie and the degumming liquid are mixed, the temperature is risen and kept, and gum is completely removed; the degummed ramie after degumming is moved out from a reaction system, and washed with clean water repeatedly, an oiling agent is used for supplying oil, then the ramie is rolled, the ramie is put into an oven to be dried, and opened and combed by a silk spinning opener, and scattered degummed ramie fiber is obtained. The method provided by the invention can remove surplus free radicals with strong oxidizing property in the degumming liquid by screening a suitable chemical reagent as the radical scavenger, well control the oxidizing property of the degumming liquid, prevent fiber damage caused by too strong oxidizing property of the degumming liquid, and enhance physical and mechanical properties of the fiber, thereby having important theoretical significance and practical significance.

Description

technical field [0001] The invention relates to a method for regulating the generation of free radicals in the oxidative degumming process of ramie, and belongs to the technical field of natural fiber preparation and free radical regulation in the field of textiles. Background technique [0002] Natural polymer materials have the characteristics of wide sources, safe and non-toxic, low price, recyclable, biodegradable, green and environmental protection, etc., and have attracted special attention from people. Among all kinds of hemp fibers, ramie is a natural polymer material with excellent properties. Its fibers are slender and tough, have good air permeability, fast heat transfer and resistance to insects. It is an important textile raw material. The cellulose, the main component of ramie raw hemp, and other non-cellulose components are collectively referred to as colloids. Using physical (mechanical), chemical or biological methods, the colloid components such as lignin, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01C1/02
CPCD01C1/02
Inventor 李召岭丁彬俞建勇武晓会
Owner DONGHUA UNIV
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