KR860001825B1 - Shrinking property imparting process of vegetable fiber - Google Patents

Abstract

hyl sulohate or diethyl sulphate. The vegetable fibers include cotton, linen, ramie, jute, etc. and the method is esp. effective for cotton and linen fibers. The alkali is sodium (potassium, lithium) hydroxide used at a concn. of 10-60 wt.%. Dimethyl (diethyl) sulphate is used in amount 0.5 to 2.0 times wt. of the vegetable fibers. The treatment is done at normal temp. to 60 deg. C for 10 minutes to 1 hour. The higher is the degree of methyl(ethyl) etherisation (near 3) , the higher is the degree of stretchability imparted.

Description

Processing method to give elasticity of vegetable fiber

The present invention relates to a novel processing method for imparting elasticity to vegetable fibers.

In synthetic fibers, the filament yarns, which are the characteristics of synthetic fibers, are used to wrinkle the original straight filament yarn, thereby providing elasticity and improving elasticity, heat retention, and hygroscopicity. Silver is not applicable and to date there has been no way to give plant fibers elasticity.

In light of these circumstances, the inventors of the present invention have made an effort to find a processing method for imparting elasticity to vegetable fibers. As a result, when the vegetable fibers are treated with an aqueous solution of a mixture of alkali and dimethyl sulfate or diethyl sulfate, the above-mentioned objects are easy. The present invention has been accomplished by finding that a vegetable fiber that is abundantly achieved and rich in elasticity is obtained.

That is, the vegetable fiber has only 1-5% elongation before treatment, but when treated with an aqueous solution of a mixture of alkali and diethyl sulfate or dimethyl sulfate as described above, the cellulose constituting the cellulose is methyl ether. (In the case of dimethyl sulfate) or ethyl ether (in the case of diethyl sulfate), it is largely constricted in the longitudinal direction and increases in diameter.

When this is tensioned, it exhibits an elongation that corresponds approximately to the shrinkage obtained by the above-described treatment, and exhibits elasticity as much as the degree of return to the original contracted state where the tensioned release is released. Done.

Examples of the vegetable fiber imparted with elasticity by the method of the present invention include cotton, hemp, and the like. At the time of treatment, since the treatment is usually performed in the form of yarn, a remarkable effect is exerted on the cotton yarn and the yarn, as well as on the cotton yarn mixed yarn.

As alkali, strong alkalis, such as sodium hydroxide, potassium hydroxide, lithium hydroxide, are preferable, and the density | concentration in these process liquids is preferable 10-60 weight%. The reaction proceeds at room temperature, and the reaction time is preferably about 10 minutes to 1 hour.

Increasing the temperature increases the reaction rate, but because the treatment solution is a high alkaline solution, the cellulose itself is damaged, so it is not desirable to raise the reaction temperature above 60 ℃.

Methyl etherification or ethyl etherification is preferred because the higher the elasticity (ie, the degree of methylation or ethylation is close to 3), the greater the elasticity. As a treatment method, the yarn to be treated may be immersed in an aqueous solution containing a mixture of alkali and dimethyl sulfate or diethyl sulfate, and the treatment liquid may be applied to the yarn.

The treated yarn has remarkably improved elasticity and hygroscopicity. Apparently bulky and not wrinkled. In the case of cotton, the thermal conductivity improves, and the hemp becomes hard once it absorbs moisture. However, it does not harden even if water is absorbed by the above-described treatment.

In addition, the cotton is elongated with use, and the restoring force is lost, but elongation without such restoring is prevented by the above-described processing. It also improves dyeability.

Therefore, by using the method of the present invention when making the airflow using the stretched vegetable fiber, it is possible to obtain a garment that does not wrinkle well and fits well to the skin. Cotton and hemp are thermally conductive, hygroscopic, absorbing sweat well, and providing clothing that does not stick to the skin.

In particular, even if the hemp absorbs sweat, the flexibility is not lost, and the effect of the present invention is more remarkably exhibited. Therefore, these stretched vegetable fibers can be used as raw materials for all garments, but are most suitable for sportswear, underwear, casual wear, children's clothing, and baby clothing.

Example 1

To 40 g of 30% by weight aqueous sodium hydroxide solution, change the amount of dimethyl sulfate in the range of 5-20 g as shown in the first table, stir and mix, add 10 g of cotton thread to this solution, and treat at 20 ° C. for 30 minutes. It was.

Next, the wash water was washed with water until neutral, and then dried in a natural state for 24 hours.

Thus, the length, diameter, methylation degree, and elongation of the processed cotton yarn were measured. The results are shown in the first table. In addition, the length of the cotton yarn before the treatment was 27.0cm, the diameter was 47μm and the elongation was 2%.

[Table 1]

The cotton yarns treated as indicated in Table 1 exhibited a large shrinkage rate and also showed elongation corresponding to the shrinkage rate. Stretching was possible within the limits of the kidneys.

Example 2

10 g of masa was added to the mixed aqueous solution of sodium hydroxide and dimethyl sulfate similar to Example 1, and it processed at 20 degreeC for 30 minutes.

Next, it washed with water and dried in the air like Example 1. The length, diameter, degree of methylation and elongation of treated treated yarns as described above were measured. The results are shown in the second table. In addition, the pretreatment was 27.0 cm in length, 50 µm in diameter, and 1% elongation.

[Table 2]

As indicated in the second table, the treated yarn showed a large shrinkage rate and a stretch corresponding to the shrinkage rate. Stretching was possible within the limit of elongation.

Example 3

Except having changed the dimethyl sulfate into diethyl sulfate, it carried out the elasticity provision process of the cotton yarn similarly to Example 1.

Next, it washed with water and dried in the air like Example 1. The length, diameter, degree of ethylation, and elongation of the cotton yarn treated as described above were measured. The results are shown in the third table. Furthermore, the length of the cotton yarn before treatment was 27.0 cm, the diameter was 47 μm, and the elongation was 2%.

[Table 3]

Cotton yarns treated as indicated in Table 3 exhibited a large shrinkage rate and also showed elongation corresponding to the shrinkage rate. Stretching was possible within the limit of elongation.

Claims (3)

A method for imparting elasticity to a vegetable fiber, wherein the vegetable fiber is treated with a treatment solution of a mixture of alkali and dimethyl sulfate or diethyl sulfate to impart elasticity to the vegetable fiber. The processing method according to claim 1, wherein the vegetable fiber is cotton or mine. The processing method according to claim 1 or 2, wherein the alkali is sodium hydroxide, potassium hydroxide or lithium hydroxide.