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Low-temperature softening treatment method for jute fibers

A treatment method and hemp fiber technology, applied in the field of natural polymer chemistry, can solve the problems of loss of crispness and roughness, fiber damage, and easy generation of ammonia gas, etc., and achieve the effects of improved dyeing performance, reduced fiber stiffness, and reduced usage

Inactive Publication Date: 2015-03-25
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, cationic modification affects the dyeing uniformity of fibers; liquid ammonia modification and NMMO modification are expensive; copper ammonia solution is unstable and easily produces ammonia; alkylation modification will cause damage to the good properties of fibers; acetylation The chemical modification process is long. In addition, if the degree of acetylation is too low, the modification effect is not obvious, and the recrystallization of the cellulose molecular chain cannot be effectively prevented. On the contrary, if the degree of acetylation is too high, it will not only increase the cost, but also make the The hemp fiber feels too soft, loses its crisp and rough features, and damages the natural style of hemp fiber
It can be seen that there are still difficulties in making non-stinging hemp products at present.

Method used

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  • Low-temperature softening treatment method for jute fibers
  • Low-temperature softening treatment method for jute fibers
  • Low-temperature softening treatment method for jute fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of hemp fiber low-temperature softening treatment method, concrete steps are: as figure 1 As shown, the ramie fiber is pre-washed with water to remove surface impurities, and then softened and dried to obtain the softened ramie fiber; the softened treatment includes mixing ramie with a bath ratio of 1:24 The fiber is soaked in the softening treatment liquid, and the softening treatment liquid is made up of sodium hydroxide, urea and water, the concentration of sodium hydroxide is 7wt%, the concentration of urea is 12wt%, precooling to 4 ℃, at low temperature The ramie fiber was processed under the condition of -10°C and 30min, and the temperature was raised to 25°C. The fiber was first cleaned with a softening treatment solution, then washed with water, and dried at 50°C to obtain a cotton-feeling flexible ramie fiber. The above-mentioned softening treatment liquid is filtered and recycled.

Embodiment 2

[0023] A kind of hemp fiber low-temperature softening treatment method, concrete steps are: as figure 1 As shown, the flax fiber is pre-cleaned with water to remove surface impurities, and then softened in three steps, and then dried to obtain the softened flax fiber; each softening process includes making the flax fiber Soaked in the softening treatment solution, the softening treatment solution is composed of sodium hydroxide, thiourea and water, the concentration of sodium hydroxide is 5.5wt%, the concentration of thiourea is 13.5wt%, pre-cooled to -15 ℃, in a low temperature state, the treatment temperature is -80 ℃, the treatment time is 1h, take it out, raise the temperature to 30 ℃, wash with water, and dry at 50 ℃ to obtain cotton-like flexible flax fibers, and the tingling feeling of flax fibers has been significantly reduced improve. The softening treatment liquid is filtered and recycled.

Embodiment 3

[0025] A kind of hemp fiber low-temperature softening treatment method, concrete steps are: as figure 1 As shown, the ramie fiber was pre-cleaned with water to remove surface impurities, and five softening treatments were performed, followed by drying to obtain the softened ramie fiber; each softening treatment included mixing the ramie fiber with a bath ratio of 1:24 Soaked in the softening treatment solution, the softening treatment solution is composed of sodium hydroxide, urea and water, the concentration of sodium hydroxide is 11wt%, the concentration of urea is 8wt%, pre-cooled to -15 ° C, at low temperature The processing temperature is -80°C, the processing time is 10min, take it out, heat up to 30°C, wash with water, and dry at 50°C to obtain cotton-like flexible ramie fibers, the fiber crystallinity decreases, the initial modulus decreases, and the hand feel Significant improvement. The softening treatment liquid is filtered and recycled.

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Abstract

The invention provides a low-temperature softening treatment method for jute fibers. The low-temperature softening treatment method for jute fibers is characterized by concretely comprising the following steps: prewashing jute fibers to remove surface impurities, performing one to ten times of softening treatment, and drying to obtain softened jute fibers; wherein softening treatment comprises the following steps: infiltrating the jute fibers in a softening treatment fluid or spraying the softening treatment fluid onto the jute fibers, wherein the softening treatment fluid contains alkali and urea or thiourea; and treating for 10s-3h at 5DEG C to -195DEG C under low-temperature state, and taking out and washing the jute fibers. The treatment method is simple, high-efficiency and clean, the treated jute fibers are low in crystallinity, low in rigidity, and soft in hand feeling, and the prepared fabric is not itchy; and the fibers have low crystallinity, the surfaces of the fibers have partial holes and grooves, and the dyeing performance and hygroscopic property of the fibers can be obviously improved.

Description

technical field [0001] The invention relates to a method for softening hemp fibers at low temperature, which belongs to the field of textiles, novel modified natural fibers, and the field of natural polymer chemistry. Background technique [0002] Hemp fiber is one of the earliest types of fibers used in the textile field. Compared with cotton, hemp plants are more resistant to diseases and insect pests, and require less pesticides in the planting process. Hemp fiber has good moisture absorption and release properties, and some hemp fiber types have antibacterial, anti-moth, and even physical therapy effects. The fabrics produced have a unique rough and natural style. However, hemp fiber has high crystallinity and orientation, thick fiber diameter, high bending stiffness, no curl, and straight appearance, so it is not easy to bend when it comes into contact with the skin, and it will oppress the skin and cause itching. This characteristic limits the application of hemp fib...

Claims

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Application Information

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IPC IPC(8): D06M11/38D06M13/432D06M101/06
Inventor 蒋秋冉闫畅谢越施楣梧邱夷平
Owner DONGHUA UNIV
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