JP3073446B2 - Method for shrink-proofing regenerated cellulosic fiber structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for shrink-proofing a regenerated cellulosic fibrous structure which does not use a chemical and does not cause a decrease in strength.

[0002]

2. Description of the Related Art Regenerated cellulosic fibrous structures are widely used as materials for clothing and the like because of their good hygroscopicity, texture, and ease of processing. However, on the other hand, there are problems such as shrinkage due to washing and hardening of texture due to repeated washing.

[0003] Two main phenomena are related to the cause of washing shrinkage. One is the deformation due to various forces applied to the woven or knitted fabric during weaving and processing of the woven or knitted fabric. In this deformation, the woven or knitted fabric is rubbed in a free state where no force is applied during washing, and contraction occurs in order to return to the original stable state.

[0004] As a means for preventing such shrinkage, there is a mechanical method typified by sanforizing. In this method, a fabric is physically compressed and shrunk continuously by using a rubber belt type or felt blanket type sunphorizing machine, thereby alleviating latent shrinkage of the woven or knitted fabric, thereby imparting shrink resistance. However, according to such a method, latent shrinkage cannot be sufficiently reduced with respect to a thick fabric or a fabric subjected to a hard finish treatment, and good shrinkage resistance cannot be obtained.

[0005] Another phenomenon, individual fibers constituting the woven or knitted fabric swells sucking water, a shrinkage of woven occurring in association with the cross-sectional area increases knitted. Although this shrinkage is caused by absorbing water, even if the water is dried and the water disappears, the woven or knitted fabric cannot return to its original state by itself, and the shrinkage remains.

In order to prevent this kind of shrinkage, a method has been known in which a cellulose-reactive resin is used to form a chemical cross-linking between cellulose molecules of fibers to reduce swelling and impart shrinkage resistance. I have. However, in this method, although shrinkage resistance is obtained, there is a problem that strength is reduced and formalin remains.

On the other hand, a method using an epoxy compound as a resin processing that does not generate formalin is described in the Journal of the Japan Society of Fiber Science (VO).
L. 25, No. 11, 1969, VOL. 26, No. 7,
1970), and a method using a vinyl sulfone derivative is described in Dyeing Industry Magazine (VOL. 24, No. 2, 197).
6). Also, polycarboxylic acids and aliphatic
A method of reacting an ester having a carboxyl group generated by a reaction with an alcohol and a hydroxyl group of cellulose has also been proposed (see, for example, JP-A-5-247842 and JP-A-5-247850). However, although such a method can solve the problem of formalin, it does not provide sufficient shrinkage resistance, and has a problem that the strength and the color fastness are reduced.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to provide a regenerated cellulosic fibrous structure with excellent shrink resistance without using a chemical such as a cellulose-reactive resin and, as a result, without reducing the fabric strength. To provide a processing method.

[0009]

The present invention has found that remarkable shrinkage resistance can be obtained by treating a regenerated cellulosic fibrous structure in advance with liquid ammonia and then treating it with hot water in a tension-free state. The above object has been achieved.

Hereinafter, the present invention will be described in more detail.

The regenerated cellulosic fibers constituting the regenerated cellulosic fiber structure that can be treated according to the method of the present invention include rayon, polynosic, cupra, tencel, and the like.
For example, it may be in the form of a composite fiber material blended, twisted, or woven with natural fibers such as cotton and hemp, synthetic fibers such as polyester fibers, and protein-based fibers such as wool and silk. In this case, it is preferable that the content of the regenerated cellulosic fiber is large, and the proportion of the regenerated cellulosic fiber in the composite fiber material is generally 40% by weight or more, preferably 50% by weight or more.

Examples of the structure comprising such a regenerated cellulosic fiber structure include woven fabric, knitted fabric, and non-woven fabric, and these may be subjected to pretreatment such as fumigation, scouring, and bleaching as necessary. it can.

The above-mentioned regenerated cellulosic fiber structure can be treated with liquid ammonia, for example, by impregnating the regenerated cellulosic fiber structure with liquid ammonia maintained at a temperature of -33 ° C. or lower. As the impregnation method, a method of dipping in a liquid ammonia bath, a method of spraying or coating with liquid ammonia, and the like can be used. Generally, the time for impregnation with liquid ammonia is suitably about 5 to 40 seconds.

In order to transfer the cellulose II crystal structure to the cellulose III crystal structure in the regenerated cellulosic fiber, liquid ammonia is most commonly used, but in some cases, methylamine, ethylamine, etc. May also be used.

The cellulosic fiber structure that has been subjected to the liquid ammonia treatment is then subjected to a heat treatment to remove adhering ammonia.

Next, the cellulosic fiber structure that has been subjected to the liquid ammonia treatment is then subjected to a hydrothermal treatment in a tension-free state. Hot water treatment is usually about 100 to about 150 ° C,
It is preferably carried out at a temperature in the range of about 110 to about 140C. This hot water treatment is preferably performed using a device that can perform hot water treatment at high pressure, and for example, can be performed using a high-pressure liquid jet dyeing machine, a high-pressure drum dyeing machine, or the like.

By this hot water treatment, at least a part of the cellulose III crystal structure in the fibrous structure is changed to the cellulose II crystal structure.

Since the time of the hot water treatment varies depending on the temperature of the hot water and the like, it cannot be specified unconditionally.
The time can be from 0 minutes to 5 hours, preferably from 20 minutes to 4 hours. In general, the hot water treatment requires only a relatively short time when the temperature of the hot water is high, and takes a long time when the temperature of the hot water is low.
2 hours or more at 0 ° C, 1 hour or more at 110 ° C, 120
The temperature may be 40 minutes or more at 130 ° C, and 20 minutes or more at 130 to 140 ° C.

The fibrous structure that has been subjected to the hot water treatment can be subjected to a final finishing process such as tentering and adjusting the feeling as required.

The reason why the shrink resistance is improved by the method of the present invention is considered as follows. Regenerated cellulose generally has a cellulose II crystal structure. When this regenerated cellulose is impregnated with liquid ammonia, the liquid ammonia penetrates not only into the amorphous region but also into the crystalline region in the cellulose, breaking the hydrogen bond and swelling the entire fiber. Thereafter, when heat treatment is performed to evaporate the ammonia, new hydrogen bonds are generated, whereby a cellulose III crystal structure is generated in the crystal region, and the crystals are fixed in a swollen state. Next, by hydrothermal treatment in a tension-free state,
The cellulose III crystal structure returns to the cellulose II crystal structure. In the process, the swelling state is maintained by the permeation of hot water, and the relaxed state is maintained under no tension, so that the fiber structure is in the swollen and relaxed state. It will be set as it is. As a result, the effect of swelling and relaxation of water during subsequent washing will not occur,
Shrink resistance is achieved.

The method of the present invention described above does not require the use of alkaline or acidic auxiliaries such as caustic soda and acetic acid. It can be applied without deteriorating the robustness, and has the advantage that no reduction in strength occurs because no resin processing is performed.

Thus, according to the method of the present invention, the warp shrinkage after washing 10 times is 3.0% or less for rayon spun woven fabric and 3.0% for rayon filament x rayon spun woven fabric without any resin processing. It is possible to obtain a regenerated cellulosic fiber fabric having high shrinkage resistance of 5% or less and 2.0% or less of cupra fabric. The above shrinkage rate is
This is a value measured after washing is performed according to the method described in JIS L-217103 and tumble dried.

[0023]

EXAMPLES The present invention will be described more specifically with reference to examples and comparative examples, but the present invention is not limited to these examples.

Example 1 A 100% plain woven spunrayon woven fabric having a 30th single yarn (warp density: 68 yarns / inch, weft density: 60 yarns / inch) was bleached by a conventional method, treated with liquid ammonia for 10 seconds, and then heated. After removing the ammonia, 130
After 2 hours of hot water treatment, dehydration and drying were performed, followed by finishing with a tenter. After washing this fabric (JIS L-217103)
Method), the shrinkage was measured by tumble drying.

Example 2 A plain woven warp rayon filament woven fabric having a warp 120d rayon filament (warp density 102 yarns / inch) and a weft No. 30 single yarn rayon staple (weft density 60 yarns / inch) was processed in the same manner as in Example 1. gave.

Example 3 Warp 75d cupra filament (warp density 144 /
The same processing as in Example 1 was performed on a 100% plain woven cupra woven fabric having an inch and a wedged 120d cupra filament (weft density: 87 yarns / inch).

Comparative Example 1 A treatment was performed in the same manner as in Example 1 except that the liquid ammonia treatment was not performed.

Comparative Example 2 A treatment was performed in the same manner as in Example 2 except that the liquid ammonia treatment was not performed.

Comparative Example 3 A treatment was performed in the same manner as in Example 3 except that the liquid ammonia treatment was not performed.

[0030]

[Table 1]

[0031]

As is clear from the results shown in Table 1, according to the present invention, the regenerated cellulosic fibrous structure is subjected to liquid ammonia treatment, and then subjected to hot water treatment only in a tension-free state. It is possible to impart durable and very good shrink resistance to the cellulosic fiber structure. Moreover, even when applied to dyed or printed fiber structures,
Does not impair hue or fastness.

Continued on the front page (72) Inventor Kiyoshi Ikeda 45 characters in Miai-cho, Okazaki City, Aichi Prefecture Nisshinbo Industries, Ltd. Inside the Miai Plant (72) Inventor Yasushi Takagi 45 characters in Miai-cho, Okazaki City, Aichi Prefecture Nisshinbo Industries, Ltd. In the factory (72) Inventor Takeshi Ishikawa 45 characters in Miai-cho, Okazaki-shi, Aichi Prefecture Inside Nisshin Boseki Miai Plant (72) Inventor Kazuhiko Harada 45-in characters in Miai-cho, Okazaki-shi, Aichi Prefecture Nisshinbo Industries, Ltd. (72) Inventor Hiroki Iida 45 characters in Miai-cho, Okazaki City, Aichi Prefecture, Nisshinbo Industries, Ltd. ) Inventor Osamu Hasegawa 1-1-18-1, Nishiarai-cho, Adachi-ku, Tokyo Nisshinbo Industries, Inc. Tokyo Research Center (56) References JP-A-58-8184 (JP, A) JP-A-5-230742 (JP, A) JP 40-15480 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) D06M 11/00-11 / 84

Claims (1)

(57) [Claims] After a 1. A regenerated cellulose fiber structure with liquid ammonia treatment, hot water treatment in the unstretched relaxed state
100-140 ° C, and depending on the temperature of hot water
100 ° C for more than 2 hours, 110 ° C for more than 1 hour
Above, more than 40 minutes at 120 ° C, and 130-140 ° C
In this case, a method for preventing shrinkage of the regenerated cellulosic fibrous structure, which is performed for 20 minutes or more .