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Method for preparing ramie fibers through oxidation, degumming and repeated multiple-step feeding

A ramie fiber, oxidative degumming technology, applied in the direction of chemical production of bast fibers, etc., can solve the problems of reduced degumming effect and bleaching effect, uneven degumming of ramie fiber, excessive local decomposition, etc., to reduce ineffective decomposition and defoamer. The dosage, excellent mechanical properties, and the effect of reducing fiber damage

Active Publication Date: 2013-08-07
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conventional oxidation degumming process is generally one feeding, and the feeding concentration is too large, which will cause the effective oxygen in the peroxide to be decomposed before it can react with the gum, and the ineffective decomposition of the peroxide will lead to degumming and bleaching effects. reduce
At the same time, due to the rapid decomposition of available oxygen components, the degumming of ramie fibers is uneven, and local decomposition is excessive, resulting in large fiber damage.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The method for preparing ramie fiber by oxidative degumming multiple step-by-step feeding comprises the following 4 steps:

[0035] Step 1: First feeding

[0036] 0.4 kg of sodium percarbonate, 0.4 kg of polyethylene glycol, 0.2 kg of urea, 0.3 kg of polyacrylamide, 0.05 kg of defoamer, 0.1 kg of caustic soda, add 98.45 kg of water to make a degumming solution, and immerse 10 kg of ramie raw materials in the degumming solution , forming a degumming liquid system. From room temperature to 70°C, keep warm at this temperature.

[0037] Step 2: Second feeding

[0038] After 30 minutes, add 0.4 kg of sodium percarbonate and 0.1 kg of caustic soda to the degumming solution system, raise the temperature to 85°C, and keep it warm at this temperature to continue to remove the gum.

[0039] Step 3: The third feeding

[0040] After 40 minutes, add 0.4 kg of sodium percarbonate to the degumming liquid system, and keep warm at 85°C for 40 minutes until the reaction ends and the ...

Embodiment 2

[0045] The method for preparing ramie fiber by oxidative degumming multiple step-by-step feeding comprises the following 4 steps:

[0046] Step 1: First feeding

[0047] 0.4 kg of hydrogen peroxide, 0.3 kg of sodium tripolyphosphate, 0.3 kg of ethylenediamine, 0.2 kg of sodium gluconate, 0.1 kg of hydroxymethyl cellulose, 0.05 kg of defoamer, 0.15 kg of caustic soda, add 98.5 kg of water to make degumming Liquid, 10 kilograms of ramie raw materials are immersed in the degumming liquid to form a degumming liquid system. From room temperature to 80°C, keep warm at this temperature.

[0048] Step 2: Second feeding

[0049] After 20 minutes, add 0.3 kg of hydrogen peroxide and 0.1 kg of caustic soda to the degumming liquid system, raise the temperature to 90°C, and keep it warm at this temperature to continue to remove the gum.

[0050] Step 3: The third feeding

[0051] After 50 minutes, add 0.3 kg of hydrogen peroxide to the degumming solution system, and keep warm at 90°C f...

Embodiment 3

[0054] The method for preparing ramie fiber by oxidative degumming multiple step-by-step feeding comprises the following 4 steps:

[0055] Step 1: First feeding

[0056] 0.4 kg of benzoyl peroxide, 0.3 kg of polysorbate, 0.2 kg of liquid ammonia, 0.2 kg of diethylamine pentaacetic acid, 0.15 kg of hydroxymethyl cellulose, 0.05 kg of defoamer, 0.2 kg of caustic soda, and 98.5 kg of water To form a degumming solution, 10 kilograms of ramie raw materials are immersed in the degumming solution to form a degumming solution system. From room temperature to 90°C, keep warm at this temperature.

[0057] Step 2: Second feeding

[0058] After 50 minutes, add 0.3 kg of benzoyl peroxide and 0.1 kg of caustic soda to the degumming solution system, raise the temperature to 100°C, and keep it warm at this temperature to continue to remove the gum.

[0059] Step 3: The third feeding

[0060] After 50 minutes, add 0.2 kg of benzoyl peroxide to the degumming solution system, and keep warm for...

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Abstract

The invention provides a method for preparing ramie fibers through oxidation, degumming and repeated multiple-step feeding, which comprises three feeding processes and comprises the following specific steps: in the first feeding process, preparing a degumming solution from surfactant, a fiber expanding agent, peroxide stabilizer, a defoaming agent, sodium hydroxide, peroxide and water, mixing raw hemp of ramie and the degumming solution to form a degumming solution system, and heating to remove part of colloid; in the second feeding process 20-50 minutes later, adding peroxide and sodium hydroxide, and keeping the temperature to further remove the colloid; in the third feeding process 20-50 minutes later, adding peroxide, and further keeping the temperature until the reaction is finished and the colloid is completely removed; and finally, washing refined dried hemp fibers with clear water, oiling, drying, opening, and combing to obtain the prepared ramie fibers. The method provided by the invention overcomes the defects in the existing oxidation and degumming technology; a repeated multiple-step method is used, so that the reaction is uniform and moderate, the damage to the fibers caused by over too high initial concentration of initial concentration is reduced, and the quality of the refined dried hemp product is improved; and meanwhile, the ineffective decomposition of the peroxide and the consumption of the defoaming agent are reduced, thereby saving the cost.

Description

technical field [0001] The invention relates to a method for preparing ramie fibers by oxidation degumming and feeding in multiple steps, and belongs to the technical field of degumming process methods in the textile field. Background technique [0002] In oxidative degumming, if the initial concentration of peroxide is too high and the temperature is too high, the molecular structure of cellulose will be destroyed. Under alkaline conditions, peroxide will not only oxidize the colloid in the raw hemp, but also oxidize the cellulose in the raw hemp to form oxidized cellulose that is unfavorable to the lean and dried hemp. Therefore, in the process of oxidative degumming, it is necessary to control the heating rate and the degumming temperature of the peroxide, add a peroxide stabilizer, and at the same time control the release and decomposition rate of the peroxide, try to avoid or reduce the ineffective decomposition of the peroxide, and reduce the The degree of oxidation o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01C1/02
Inventor 李召岭郁崇文赵强杨建平张斌李世刚黄卫平
Owner DONGHUA UNIV
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