JPH062981B2 - How to reduce the amount of cellulose mixed material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for reducing the weight of a material mixed with cellulose. More specifically, it relates to a method for reducing the weight of a mixed material composed of long rayon fibers and polyester long fibers. By reducing the weight of the mixed material with an alkaline aqueous solution, a material having a rayon-like drape and a clear hue is obtained. To provide.

Polyester fiber has excellent dimensional stability and retains high strength, but on the other hand, it is inferior in hygroscopicity, sweat absorption and antistatic properties.
It is mixed with materials with high hygroscopicity and sweat absorption such as cotton and rayon.

On the other hand, cellulosic fibers such as cotton and rayon are wrinkle-proof,
Due to its poor W & W property and strength, it is used in combination with polyester fiber.

However, for example, when viscose rayon and polyester are mixed, the strength is increased and the dimensional stability, W & W property and wrinkle resistance are improved, but the drape property is deteriorated and the texture is rough compared to 100% viscose rayon. It becomes hard and loses the refreshing feel peculiar to rayon, and it does not look any different from 100% polyester.

The present inventors have found that in a mixed material composed of long rayon fibers and long polyester fibers, the strength is increased more than 100% rayon, the dimensional stability, wrinkle resistance, and W & W property are excellent, and
100% rayon for drape and refreshing fit
As a result of diligent examination of mixed materials that are almost the same as
The present invention has been completed.

That is, the present invention resides in a method for reducing the amount of a cellulose mixed material, which comprises reducing the amount of a mixed material composed of rayon long fibers and polyester long fibers with an alkaline aqueous solution.

According to the present invention, the mixed material composed of long rayon fibers and long polyester fibers has a more drayable tone when treated with an alkaline aqueous solution, and a refreshing feeling peculiar to rayon is obtained. Further, the rayon fiber is treated with an alkaline aqueous solution to increase the dyeing property with a dye for cellulose such as a direct dye or a reactive dye, and exhibits a clear hue.

The weight reduction effect of the alkaline aqueous solution is, for example, rayon 7
A blended yarn fabric of 5b and polyester 50d was reduced by 15% in an alkaline aqueous solution (after the reduction, the yarn usage was almost the same as that of the blended yarn fabric of rayon 75d and polyester 40d) and rayon 75d and polyester 40d. Comparing the mixed woven yarn fabrics, it is surprising that the former has a rayon-like drape, and exhibits gloss and a clear hue. This is because the alkali weight loss of the mixed material exhibits a peculiar phenomenon of becoming rayon-like unlike the weight loss of the conventional polyester alone (for silk-like purpose), which cannot be predicted at all from the conventional idea.

The refreshing feeling peculiar to rayon in the present invention is
When you wear rayon fiber products, you will feel a chilly feeling and you will get a very refreshing feeling of comfort. This refreshing feeling is the cold sensation felt when rayon comes into contact with the skin.
(Hereinafter, referred to as contact cold sensation.) The present inventors used the heat transfer rate to express the contact cool sensation. The heat transfer rate (hereinafter abbreviated as qmax) was calculated as follows.

The temperature drop of the heat source plate immediately after one side of the heat source plate is brought into contact with the sample surface is measured, and the heat transfer and its speed are obtained.
That is, From (1) and (2) From equation (3), find q _max .

T _O : Temperature of heat source plate before contact T _(t) : Temperature of heat source plate at time t Q _(t) : Heat release amount per unit area of heat source plate until time t (cal) q _(t) : Heat transfer rate (cal / cm ² S) A: Area of heat source plate M: Mass of heat source plate C: Specific heat of heat source plate (cal / g · ° C) Consisting of rayon filament and polyester filament in the present invention The mixed material is a mixture of rayon fibers such as viscose rayon (including polynodick) and copper-ammonia rayon and polyester fibers. The mixing method is mixed weaving,
Mixed twists, false twists, mixed knits, and the like, which are preferably used in a yarn, and mixed weave are most preferable. Further, as a method for producing a mixed woven yarn, there are an injection processing method and an interlace processing method. By mixing and twisting after mixing and weaving, a mixing material having a high bulkiness can be obtained. The twist number is 3000 T / M or less, preferably 0 to 2
It is 500 T / M.

In addition, the mixing ratio of long rayon and long polyester fiber is at least 30% rayon.

The alkaline aqueous solution used in the present invention is an aqueous solution of an alkali metal hydroxide such as sodium hydroxide or potassium hydroxide, and a quaternary ammonium compound or the like that promotes alkali reduction is used together with these aqueous solutions. Is also possible. Examples of the quaternary ammonium compound include, but are not limited to, lauryl trimethyl ammonium chloride and cetyl trimethyl ammonium bromide.

As the treatment method, a dipping method in which a mixed material composed of rayon long fibers and polyester long fibers is immersed in an alkaline aqueous solution and subjected to heat treatment, steaming or winding of the mixed material to which the alkaline aqueous solution has been applied is performed for a long time. There is a way to age.

In the case of the dipping method, the treatment temperature is 60 to 150 ° C, preferably 80 to 120 ° C. If the temperature is 60 ° C. or lower, the treatment time becomes long, and if the temperature is 150 ° C. or higher, the rayon fibers have large hand-curing and shrinkage, and the dispersion due to the treatment is large and the reproducibility is poor. Also, the processing time is usually 2
It is 0 to 180 minutes, preferably 60 to 90 minutes.

The concentration of the alkaline aqueous solution varies depending on the mixing ratio of the materials to be mixed, the form, the treatment method, and the treatment conditions, but in the case of the dipping method, the alkali metal hydroxide content is 40 to 80 g /. 40 g /
In the following, the processing time becomes long. On the other hand, when it is 80 g / g or more, the strength of the rayon fiber is hardened and the weight of the polyester fiber is decreased, so that the strength of the rayon fiber is reduced and the fiber is significantly shrunk. Moreover, when using a quaternary ammonium compound together, it is 2-10 g /.

Next, the present invention will be specifically described with reference to examples.

Example 1 Viscose rayon 75b / 33f and polyester 5
A satin finished fabric made of 0d / 36f mixed yarn was treated with 40 g of sodium hydroxide / aqueous solution at 90 ° C. for 60 minutes, neutralized, washed with water and dried to obtain a fabric having a weight loss rate of 15%.

Next, the woven fabric was dyed in the following dyeing order and conditions.

Disperse dye dye CI Disperse Red 132 5% owf Disper TL (dispersant ... Meisei Chemical Co., Ltd.) 2g / acetic acid 0.3c.c./bath ratio 1:50 120 ° C × 60 minutes reduction washing hydrosulfite 2g / Sanmol RC-700 1g / sodium hydroxide 1g / bath ratio 1:50 80 ℃ × 15 minutes Reactive dye CI Reactive Red 158 3.5% owf sodium sulfate 50g / sodium carbonate 10g / bath ratio 1:50 80 ℃ × 60 minutes Soaping Lipotor TC-300 (nonionic, anionic detergent ... Nissho Chemical Co., Ltd. 2 g / sodium carbonate 1 g / bath ratio 1:50 80 ° C. × 15 minutes) The above dyed product was washed with hot water, washed with water and dried to obtain a red satin finished fabric. .

The red satin fabric was dipped in a 1% aqueous solution of Lanotex BC (softening agent manufactured by Takamatsu Yushi Co., Ltd.), squeezed and dried at 120 ° C. for 2 minutes. (Invention method) On the other hand, a satin fabric made of a mixed woven yarn of viscose rayon 75d / 33f and polyester 40d / 24f was used for dye sequence and conditions of Example 1 (. Disperse dye dyeing ,.
Reduction cleaning ,. Reactive dye staining ,. Dyeing with soaping) and softening treatment were also performed under the same conditions as in Example 1 to obtain a red satin finished fabric. (Comparative Example 1) Furthermore, a viscose method was used to treat a satin fabric made of rayon 75d / 33f under the same conditions as the reactive dye dyeing conditions, soaping conditions, and softening conditions of Example 1 to obtain a red rayon satin fabric. It was (Comparative Example 2) Also, 75d / polyester
The satin fabric made of 36f was treated under the same conditions as the disperse dye dyeing conditions, reduction washing conditions and softening treatment conditions of Example 1,
A red polyester satin fabric was obtained. Comparative Example 3 Note that q _max was measured by the following method.

Measuring machine: Thermo Lab (made by Kato Iron Works Co., Ltd.) Heat source plate: Copper plate (specific heat 0.0919), mass 9.79 g, area is 3 cm × 3 cm = 9 cm ² Set temperature (temperature of heat source plate): 30 ° C Temperature difference (ΔT) It is set to 15 deg.

Sample size: 5cm × 5cm W & W property is wrinkle JIS-L-1096A method after washing, wrinkle resistance is JIS-L-1096A method (wire method), drape method is JIS-L-1096
The drape coefficient and diameter thread strength were measured according to JIS-L-1070.

From Table 1, it is clear that the method of the present invention is
& W property is superior to Comparative Example 2, and there is almost no difference in drape property and q _{max from} 100% rayon (Comparative Example 2).
It is a material with a refreshing feel.

Further, it is far superior to Comparative Example 1 which is almost the same as the yarn usage of the cloth obtained by the method of the present invention, and demonstrates the peculiarity of the alkali reduction of the mixed material.

Example 2 Mixing material (two kinds of mixed yarn and twisted yarn) composed of viscose rayon long fibers and polyester long fibers shown in Table 2 was mixed with sodium hydroxide 40 g / aqueous solution 9
The fabric was treated at 0 ° C. for 60 minutes, neutralized, washed with water and dried, and then the fabric was dyed and softened under the same conditions as in Example 1. The results are shown in Table 2.

From the results shown in Table 2, the method in the form of a mixed woven yarn has a particularly high strength and has a rayon-like drape property.

As is clear from Examples 1 and 2 described above, according to the method of the present invention, rayon filaments and polyester filaments having excellent W & W property, anti-wrinkle property, drayability like rayon and refreshing feeling of comfort are more preferable. It is possible to obtain a mixed material that has a high industrial value.

Claims (2)

[Claims] 1. A mixed material composed of long rayon fibers and long polyester fibers containing 40 to 80 g of alkali metal hydroxide /
Dip it in the alkaline aqueous solution at 60-150 ℃ for 20-180 minutes,
Next, a method for reducing the amount of cellulose-mixed material characterized by neutralizing. 2. The method for reducing the amount of a cellulose mixed material according to claim 1, which is a mixed fiber made of a mixed material composed of rayon long fibers and polyester long fibers.