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Method for improving physical and mechanical properties of oxidation-degummed ramie

A ramie fine-drying hemp, physical and mechanical technology, applied in the direction of producing bast fiber by chemical method, can solve the problem of physical and mechanical properties such as strength, length, elongation and softness, which cannot be restored and repaired macromolecular chains, and the use of reducing agents Harsh conditions and other problems, to achieve the effect of reducing yellowing, high reduction and softening efficiency, and mild working conditions

Active Publication Date: 2015-04-08
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the concentration, time, temperature and other conditions are not properly controlled, it may cause fiber damage, resulting in a decrease in physical and mechanical properties such as strength, length, elongation and softness.
[0004] Some existing reduction cleaning can only remove the residual oxidant on the fiber, but cannot restore and repair the damaged macromolecular chain, and some strong reducing agents have harsh conditions and cannot be used in aqueous solution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The method of improving the physical and mechanical properties of oxidized degummed ramie dry hemp is as follows:

[0031] 1.0 kg of sodium percarbonate, 0.4 kg of sodium metaphosphate, 0.2 kg of urea, 0.3 kg of polyacrylamide, 0.1 kg of caustic soda, add 98.0 kg of water to make a degumming solution, and immerse 10 kg of ramie raw materials in the degumming solution. Start heating from room temperature, rise to 100°C within half an hour, and keep at this temperature for 60 minutes. Then lower the temperature to 70°C, add 0.3 kg of potassium borohydride, and keep warm at this temperature for 50 minutes. Wash with water, oil and dry.

[0032] The length of the ramie fiber is measured by the comb method, the fiber strength is tested by the bundle fiber strength instrument, the elongation at break of the fiber is tested by the tensile strength instrument, and the softness of the fiber is tested by the twisting method. The clamping distance is 10cm, the pre-tension is 20c...

Embodiment 2

[0036] The method of improving the physical and mechanical properties of oxidized degummed ramie dry hemp is as follows:

[0037] 0.8 kg of hydrogen peroxide, 0.3 kg of sodium tripolyphosphate, 0.3 kg of ethylenediamine, 0.2 kg of sodium benzoate, 0.1 kg of hydroxymethyl cellulose, 0.3 kg of caustic soda, add 98.0 kg of water to make a degumming solution, immerse 10 kg of ramie raw materials in the degumming solution. Start to heat up from room temperature, rise to 95°C within half an hour, and keep at this temperature for 50 minutes. Then lower the temperature to 60°C, add 0.2 kg of sodium sulfide, and keep warm at this temperature for 80 minutes. Wash with water, oil and dry. The measured fiber average length is 152mm, the strength is 5.01g / d, the elongation is 3.13%, and the number of twists is 167 / 10cm.

Embodiment 3

[0039] The method of improving the physical and mechanical properties of oxidized degummed ramie dry hemp is as follows:

[0040] 1.0 kg of potassium permanganate, 0.3 kg of sodium stearate, 0.4 kg of liquid ammonia, 0.2 kg of acetanilide, 0.15 kg of polyvinyl alcohol, 0.2 kg of caustic soda, add 97.75 kg of water to make a degumming solution, and immerse 10 kg of ramie raw materials into the degumming solution middle. Start heating from room temperature, rise to 100°C within half an hour, and keep at this temperature for 45 minutes. Then lower the temperature to 60°C, add 0.3 kg of sodium borohydride, and keep warm at this temperature for 45 minutes. Wash with water, oil and dry. The measured fiber average length is 144mm, the strength is 4.95g / d, the elongation is 3.05%, and the number of twists is 159 / 10cm.

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Abstract

The invention provides a method for improving the physical and mechanical properties of oxidation-degummed ramie. The method comprises the following steps of: preparing a degumming solution by using caustic soda, an oxidant, a surfactant, a fiber expanding agent, an oxidant stabilizer and water; mixing raw ramie and the degumming solution, heating, and boiling off to sufficiently remove colloid; and then cooling, adding a reduction softener, maintaining the temperature, oiling and drying after washing with clear water, and opening and carding to obtain textile ramie fiber subjected to reduction modification. According to the method disclosed by the invention, the defects of the prior art are overcome; and the reduction softener is added to raffinate obtained after oxidation-degumming, oxycellulose produced in the degumming process is reduced and softened, so that the physical and mechanical properties, such as strength, length, elongation and softness of the fiber are improved, the working procedures are simplified, and pollution and environmental pressure are lightened.

Description

technical field [0001] The invention relates to a method for improving the physical and mechanical properties of oxidized degummed ramie fine-dried hemp, which belongs to the technical field of oxidation degumming and reduction softening modification of hemp fibers in the textile field. Background technique [0002] The main component of hemp fiber is cellulose, which is the basic material for textile fibers. In addition, there are non-cellulose substances such as hemicellulose, pectin, and lignin. These colloids surround the surface of the fiber and make the raw hemp fiber stick together in a strong sheet. [0003] Before spinning, the colloid in the raw hemp is removed, and the process of separating the single fibers from each other is called degumming. Degumming hemp fibers with oxidants can greatly shorten the process time, save costs and improve efficiency. However, if the concentration, time, temperature and other conditions are not properly controlled, fiber damage ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01C1/02
Inventor 李召岭孟超然郁崇文李世刚黄卫平杨建平张斌
Owner DONGHUA UNIV
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