JPH08302566A - Processing of regenerated cellulosic textile product - Google Patents

Abstract

PURPOSE: To improve the gloss and dimensional stability without hardening the touch feeling by impregnating a regenerated cellulosic textile product with an aqueous solution of caustic soda at a high concentration and then bringing the textile product into contact with a gaseous compound reactive with the caustic soda. CONSTITUTION: A regenerated cellulosic textile product such as a viscose fiber or a cuprammonium fiber is impregnated with a 5-40wt.% aqueous solution of caustic soda and then brought into contact with a gaseous compound reactive with the caustic soda such as carbon dioxide gas, hydrogen chloride gas or sulfurous acid gas in the vapor phase to remove the caustic soda in a short time. The resultant textile product is subsequently washed with water and dried.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a processing method in which the strength of a regenerated cellulosic fiber product is enhanced, the texture is not hardened, and the gloss and dimensional stability are improved.

[0002]

2. Description of the Related Art Conventionally, so-called "mercerizing" has been known as a means for increasing the strength and improving the dimensional stability of a fiber product mainly made of cotton to obtain a high-quality fiber product. There is.

In this processing method, a yarn or a woven fabric mainly composed of cellulosic fibers is immersed in a high-concentration aqueous solution of caustic soda under tension, and after permeating, it is washed and neutralized.
It is widely used for the processing of cellulosic fiber products because it has not only the effect of improving gloss and dimensional stability but also the effect of improving strength and dyeability.

However, when the above-mentioned "mercerizing" is applied to regenerated cellulosic fiber products, in the usual "mercerizing", washing with water or hot water is carried out to remove the impregnated caustic soda after the treatment with a concentrated aqueous solution of caustic soda. As a result, the concentration of the aqueous caustic soda solution in the regenerated cellulosic fiber product gradually decreases from a high concentration to a low concentration.

However, regenerated cellulose fibers are most easily dissolved by caustic soda when the concentration of the caustic soda aqueous solution is 5 to 15% by weight. In the above-mentioned "mercerizing", there is a problem that the regenerated cellulose fiber is dissolved and hardened because of passing this concentration at the time of washing, resulting in deterioration of strength and texture and loss of commercial value. It was In particular, this problem was serious in the treatment of the mixed product with cotton and synthetic fiber.

[0006]

SUMMARY OF THE INVENTION The present invention enables alkali treatment of regenerated cellulosic fiber products by focusing attention on the difficulty of alkali treatment of regenerated cellulosic fiber products for the reasons described above. The purpose of the invention is not only to improve the strength and gloss of regenerated cellulosic fibers, but also to develop them.

[0007]

According to the present invention, a regenerated cellulosic fiber product is impregnated with a high-concentration aqueous sodium hydroxide solution,
Then, a gaseous compound capable of reacting with caustic soda is brought into contact with in a gas to remove the caustic soda in a short time.

By this means, the caustic soda contained in the regenerated cellulosic fiber product can be rapidly removed, and the regenerated cellulosic fiber can be dissolved and cured extremely in the range where the concentration of the caustic soda solution is 5 to 15% by weight. Fewer results are obtained.

The regenerated cellulosic fiber products to which the present invention is applied include regenerated cellulosic fiber products such as rayon and cupra, or these regenerated cellulosic fibers.
Cotton, linen and other cellulose fibers, polyester, polyamide, polyacrylonitrile and other synthetic fibers, cellulose acetate and other semi-synthetic fibers mixed or mixed yarn, these yarns only, or a woven fabric containing these yarns as constituent components, Examples include knitted fabrics and non-woven fabrics containing the above fibers.

The concentration of the caustic soda aqueous solution used in the treatment of the present invention is preferably 15 to 40% by weight. If the concentration is too high, it becomes difficult to control the conditions, the viscosity increases, and the permeation into fiber products deteriorates. If the concentration is too low, the treatment effect will be reduced, and there will be obstacles such as dissolution and gelation, cutting and curing.

In the caustic soda aqueous solution treatment, the regenerated cellulosic fiber product is immersed in the caustic soda aqueous solution at around room temperature and penetrated to maintain the tension. For example, in the case of a thread, the thread is applied to a plurality of drums, and the means for applying tension to the threads by expanding the intervals between the drums, and in the case of a woven fabric, the tenter is applied in the length and width directions. There are means, etc. The treatment temperature is near room temperature, but is rather low, that is, 10 ° C to 20 ° C is preferable.

In this treatment, a penetrant, a fluorescent agent, a bluing agent and the like may be added to the treatment liquid as needed.
The treatment time is preferably several seconds to several minutes.

The removal treatment performed after the caustic soda treatment is performed by applying a gaseous compound to the fiber product. Examples of the gaseous compound for removal include carbon dioxide gas, hydrogen chloride gas, sulfur oxide gas, sulfur oxide gas and the like. However, carbon dioxide gas and hydrogen chloride gas are preferable because they are easy to handle and effective.

The treatment method is as follows: the regenerated cellulosic fiber product impregnated with caustic soda is sprayed with a gas for removal treatment, or the cellulosic fiber product is passed through a gas-filled treatment chamber for treatment. There is a means of.
The treatment condition is usually around room temperature until caustic soda is substantially eliminated.

After the treatment, washing with water is carried out to remove the compounds formed on the regenerated cellulosic fiber product and the various additives. After washing with water and drying, the desired product can be obtained.

Next, the present invention will be described in more detail by way of examples. Various data in the examples were measured by the following methods. Yarn Tensile Strength and Elongation JIS L1095 General Spinning Test Method 7.5 Single yarn Based on tensile strength and elongation. Barium activity number of yarn JIS L1095 General spinning test method 7.32 According to the barium activity number section. Gloss of yarn By Jeffries method. Tensile strength of woven fabric JIS L1096 General woven fabric test method 6.12 Tensile strength and elongation according to item B method (strip method). Tear strength of woven fabric JIS L1096 General woven fabric test method 6.15 Tear strength term D method (Pendulum method). Wrinkle resistance of woven fabric JIS L1059 Wrinkle resistance test method of woven fabric B method (Monsanto method). Barium activity number of woven fabric JIS L1096 General woven fabric test method 6.41 According to the barium activity number section.

[Example 1] A rayon yarn with a yarn count of 60/2 was laid over two rolls, dipped in a 23 wt% caustic soda aqueous solution for 30 seconds, and the interval between the two rolls was changed to the original length. The temperature is maintained for 1 minute in a room at 25 ° C, and then carbon dioxide gas is added at a rate of 25 liters per minute for 2 minutes.
The yarn was sprayed for one minute, and then the yarn was washed with water and dried.

For comparison, in the above embodiment, 2
Immerse in 3 wt% caustic soda aqueous solution for 30 seconds, keep the distance between the two rolls in the room at 25 ° C for 1 minute while maintaining the original length, and then wash with hot water at 80 ° C for 1 minute. After that, the same yarn was washed with water and dried. (Comparative example)

Among the obtained yarns, the method shown in the comparative example melted the fibers and the state of the yarn could not be maintained, and it was impossible to measure the characteristics of the yarn shown below. The results shown in Table 1 below were obtained.

[Table 1]

As is clear from the above results, in the comparative example, that is, in the conventional method, mercerization of regenerated cellulose was impossible due to the dissolution of fibers, but the method of the present invention enables sufficient alkali treatment. Therefore, it can be seen that excellent results are obtained.

[Embodiment 2] The vertical and horizontal movements are also 40th,
110 rayon / 75 rayon broad cloths having a density of 2.54 cm are scoured, dipped in a 23.5 wt% caustic soda aqueous solution for 10 seconds, squeezed to a squeezing ratio of 100%, and then laid in a tenter in a vertical direction The cloth was treated for 50 seconds while being stretched by 1% and maintaining the original width in the width direction, followed by spraying hydrogen chloride gas onto the cloth in an amount of 15 liters per minute, followed by washing with water and drying.

For comparison, in the above example, after dipping in a caustic soda aqueous solution and a tenter treatment, hot water at 60 ° C. was continuously poured, then washed with hot water, neutralized with a 0.3% dilute sulfuric acid aqueous solution, and washed with water. Dried. (Comparative example)

Among the obtained cloths, the method shown in the comparative example melts the fibers, so that it is difficult to process the cloth, a normal cloth cannot be obtained, and the characteristics cannot be measured. Then, the results of the following Table 2 were obtained.

[Table 2]

As is clear from the above results, the comparative example, that is, the conventional method cannot mercerize the regenerated cellulosic fiber woven fabric, whereas the present invention enables the alkali treatment, and the gloss and strength. It turns out that is excellent.

[0025]

[Effect] As is clear from the above description and the results of each example, regenerated cellulose-based fiber products cannot be subjected to conventional "mercerizing", whereas the method of the present invention uses regenerated cellulose. Not only is it possible to subject the textile products to alkali treatment, but the treated products have the epoch-making effect that the gloss and dyeability are improved and the strength is also improved.

Claims (4)

[Claims] 1. A regeneration characterized in that a regenerated cellulosic fiber product is impregnated with a high-concentration aqueous solution of caustic soda, and then contacted with a gaseous compound capable of reacting with caustic soda in a gas to remove the caustic soda in a short time. Processing method of cellulosic fiber products. 2. The method for processing a regenerated cellulosic fiber product according to claim 1, wherein the regenerated cellulosic fiber product is a fiber product containing rayon or cupra fibers. 3. The method for processing a regenerated cellulosic fiber product according to claim 1, wherein the concentration of the caustic soda aqueous solution is 15 to 40% by weight. 4. The method for processing a regenerated cellulose-based fiber product according to claim 1, wherein the gaseous compound is carbon dioxide gas, hydrogen chloride gas or sulfurous acid gas.