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Ramie fiber softening method

A technology of ramie fiber and sodium hydroxide is applied in the field of textile natural fibers, which can solve the problems of affecting the comfort of clothing and reducing the moisture absorption and desorption performance of fibers, and achieve the effects of increasing moisture absorption and dehydration performance, and reducing crystallinity and modulus.

Active Publication Date: 2020-07-07
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of adding finishing agents such as polyurethane to the surface of fibers or hemp textiles can ensure the strength of fibers and textiles, but it significantly reduces the moisture absorption and release properties of fibers and affects the comfort of clothing

Method used

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  • Ramie fiber softening method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 5 g of ramie fibers, immerse the ramie fibers in a 10% sodium hydroxide solution, let stand at room temperature for 20 minutes, and make the fibers swell; then take out the fibers, put them into 100 mL of water, and gradually add a 30% acetic acid solution until The pH value is neutral; after the fiber is cleaned with 60 ℃ of pure water, freeze-drying 24h is used in a freeze dryer; finally the ramie fiber is taken out, immersed in 50%, 80%, 85%, 90% ionic liquid (milk file ) using ultrasonic treatment for 15-30 minutes; washing and drying to obtain softened ramie fibers. The physical and mechanical properties of the finally obtained fibers are shown in Table 1.

[0026] Table 1 Comparison of physical and mechanical properties of ramie fiber obtained under different treatment conditions and conventional fiber physical and mechanical properties

[0027]

[0028] The above experimental results show that after the ramie fiber is treated by the technical solution, ...

Embodiment 2

[0030] Weigh 5 g of ramie fiber, immerse the ramie fiber in a 5% sodium hydroxide solution, and let it stand at 15°C for 30 minutes to make the fiber swell; then take out the fiber, put it in water, and gradually add hydrochloric acid solution to neutralize the fiber sodium hydroxide until the pH value is neutral; then the ramie fibers are washed in hot water, the ramie fibers are taken out from the aqueous solution, drained, and freeze-dried for 10 hours using a freeze dryer to freeze-dry the moisture inside the fibers; Immerse the freeze-dried ramie fiber in ionic liquid (milk file) with a mass concentration of 70%, and ultrasonically treat it for 30 minutes; wash and dry the treated ramie fiber to obtain softened ramie fiber.

Embodiment 3

[0032] Weigh 5 g of ramie fiber, immerse the ramie fiber in a sodium hydroxide solution with a mass concentration of 20%, and let it stand at 30°C for 10 seconds to make the fiber swell; then take out the fiber, put it in water, and gradually add acetic acid solution to neutralize the fiber sodium hydroxide until the pH value is neutral; then the ramie fibers are put into pure water for cleaning, the ramie fibers are taken out from the aqueous solution, drained, and freeze-dried for 10 hours using a freeze dryer to freeze-dry the moisture inside the fibers; The freeze-dried ramie fibers are immersed in an ionic liquid (milk file) with a mass concentration of 90%, and ultrasonically treated for 15 minutes; the treated ramie fibers are washed and dried to obtain softened ramie fibers.

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Abstract

The invention relates to the field of textile natural fibers, and provides a ramie fiber softening method comprising the following step (1) of immersing ramie fibers into a sodium hydroxide solution for swelling treatment; the step (2) of taking out the swelled ramie fibers, and placing the ramie fibers into water; gradually adding acidic solutions till pH is neutral, and washing the ramie fiberswith purified water; the step (3) of freezing and drying the washed ramie fibers, so that gaps of the ramie fibers are reserved; the step (4) of immersing the frozen and dried ramie fibers into ionicliquid with a certain concentration for ultrasonic treatment; the step (5) washing and drying the treated ramie fibers to obtain softened ramie fibers. According to the ramie fiber softening method, the crystallinity and modulus of the ramie fibers can be reduced obviously; since lots of gaps are increased in the ramie fibers, the moisture absorption and release properties of the fibers are improved; and meanwhile, by this way, the chemical composition of the fibers is not damaged, and the antibacterial component of the fibers can be reserved, so that the antibacterial activity of the fibers is reserved.

Description

technical field [0001] The invention relates to the field of textile natural fibers, in particular to a method for softening ramie fibers. Background technique [0002] Ramie fiber is widely used in the production of summer clothing due to its excellent moisture absorption and perspiration and antibacterial properties. However, ramie fiber has high rigidity and rough fiber, which is easy to cause itching feeling when wearing, which greatly limits the application of its high-grade textile clothing. In the prior art, enzyme treatment is generally used to soften ramie fibers. The main way is to reduce the crystallinity and modulus of fibers through enzyme treatment, but the treatment will be accompanied by a large reduction in fiber strength. The method of adding finishing agents such as polyurethane to the surface of fibers or hemp textiles can ensure the strength of fibers and textiles, but it obviously reduces the moisture absorption and release performance of fibers and af...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/38D06M13/188D06M10/00D06M10/08D06M101/06
CPCD06M11/38D06M13/188D06M10/00D06M10/08D06M2200/50D06M2101/06
Inventor 姜伟韩光亭张元明周成凤聂凯吕万万
Owner QINGDAO UNIV
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