JPH07238477A - Production of highly stretch fabric - Google Patents

Abstract

PURPOSE:To obtain highly stretch fabric having excellent clear color and permanence free from reduction in stretchability even being exposed to natural light rays for a long period of time by providing fabric containing polyether-ester elastic yarn with a specific ultraviolet absorber. CONSTITUTION:Fabric containing polyether-ester elastic yarn composed of a block copolymer comprising a polyester consisting essentially of a polyethylene terephthalate or a polybutylene terephthalate as a hard segment and a polyether consisting essentially of a straight-chain polyalkylene glycol as a soft segment is provided with an aqueous solution containing both a benzotriazole-based ultraviolet absorber and a dyeing carrier and heat-treated at 80-170 deg.C to fix the ultraviolet absorber. Then the fabric is dyed to give light-resistant highly stretch fabric having a clear color which is not obtained by a conventional method for imparting an ultraviolet absorber together with dyeing to fabric, showing excellent stretchability for a long period of time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a light-resistant highly stretchable fabric having a clear color whose stretchability does not easily deteriorate even when exposed to natural light for a long time.

[0002]

2. Description of the Related Art Conventionally, as highly stretchable fabrics for clothing, industrial use, etc., those containing polyurethane-based fibers having high elasticity have been used. When forming a fabric using this polyurethane fiber, it is rarely used alone,
Generally, it is often used in the following modes. That is, a yarn made of polyurethane fibers and a yarn made of polyamide fibers, polyester fibers, etc. are used to form a cloth by knitting or weaving, or a yarn made of polyurethane fibers and a yarn made of polyamide fibers, etc. A mixed yarn made of mixed fibers is used to form a fabric by knitting or weaving it, or a covered yarn made of polyurethane fibers covered with polyamide fiber, polyester fiber, cotton, acrylic fiber, etc. Is used to form a fabric.

Therefore, for example, when dyeing a highly stretchable fabric composed of polyurethane fibers and polyester fibers, there is a problem that dyeing is difficult because the dyeability of both fibers is different. That is, when dyeing is performed under high temperature and high pressure in order to dye polyester fiber well,
There has been a problem that the urethane-based polymer that constitutes the polyurethane-based fiber is hydrolyzed, and the polyurethane-based fiber is deteriorated, and the high stretchability of the fabric is extremely reduced. Further, if the dyeing process is performed under normal pressure in order to dye the polyurethane fiber without deteriorating, there is a problem that the polyester fiber cannot be dyed well.

For this reason, recently, as a fiber having a high elasticity, a method of using a polyester ester elastic fiber having a dyeing property similar to that of a polyester fiber has been carried out. In the case of a highly stretchable fabric composed of polyester fibers and polyetherester elastic fibers, the polyetherester elastic fibers are less likely to deteriorate even when dyeing is performed under high temperature and high pressure, and both fibers are dyed well, therefore, This highly stretchable fabric has good dyeability, is uniformly dyed, and has little deterioration of the polyetherester elastic fiber, and is suitable for use in clothing and the like.

However, when this highly stretchable fabric is used for a long period of time such as for clothing, there is a drawback that the stretchability gradually decreases.

[0006]

DISCLOSURE OF THE INVENTION The present inventors have examined why a highly stretchable fabric composed of polyester fibers and polyetherester elastic fibers causes a reduction in stretchability after long-term use. As a result, it was found that when the highly stretchable fabric was exposed to natural light such as sunlight, the polyetherester elastic fiber became brittle and the stretchability was lowered. Furthermore, the present inventors examined how much wavelength of natural light would make the polyetherester elastic fiber brittle. As a result, it was found that the light in the ultraviolet region causes brittleness of the polyetherester elastic fiber, and light of other wavelengths (for example, light in the infrared region) does not easily embrittle the polyetherester elastic fiber.

Based on the above findings, the inventors of the present invention absorb a ultraviolet ray in natural light by applying a specific ultraviolet ray absorbent to a fabric containing a polyetherester elastic fiber. However, the attack of ultraviolet rays on the block copolymer forming the polyetherester elastic fiber is reduced, thereby preventing the polyetherester elastic fiber from becoming brittle and maintaining the high stretchability of the fabric for a long period of time. A method for obtaining the same was proposed in Japanese Patent Application No. 4-297932. This proposal is a method of applying a benzotriazole-based UV absorber to a fabric containing polyetherester elastic fibers at the same time as dyeing. However, this method has a serious drawback that it is difficult to obtain a bright color on the fabric. found.

The present invention has been made in view of the above circumstances and has a vivid color by using a fabric containing a polyetherester elastic yarn, and has a low elasticity even when exposed to natural light. It is intended to produce a light-resistant stretchable fabric that is difficult to do.

[0009]

The present invention achieves the above-mentioned object and has the following configuration. That is, the present invention is a polyether ester formed from a block copolymer having a polyester mainly containing polyethylene terephthalate or polybutylene terephthalate as a hard segment and a polyether mainly containing linear polyalkylene glycol as a soft segment. An aqueous solution containing a benzotriazole-based UV absorber and a dyeing carrier is applied to a fabric containing a system elastic fiber
The gist of the present invention is a method for producing a highly stretchable fabric, which is characterized by heat treatment at 170 ° C and then dyeing.

The present invention will be described in detail below.

First, the polyetherester elastic fiber used in the present invention will be described. This polyetherester elastic fiber is obtained by melt spinning a block copolymer of polyether and polyester. In this polyetherester elastic fiber, since the polyether is a soft segment and the polyester is a hard segment in the block copolymer, high elasticity is exhibited by both of these segments.

Here, as the polyester, polyethylene terephthalate or polybutylene terephthalate is used, and polyester mainly containing these is used. As the polyether, linear polyalkylene glycol such as polyethylene glycol or polytetramethylene glycol, or those mainly containing these are used. In particular, in order to obtain high stretchability and light resistance, it is most preferable to use polytetramethylene glycol.

The weight average molecular weight of the polyether is 500
It is preferably 5,000. When the molecular weight of the polyether is less than 500, the elasticity and light resistance of the polyetherester elastic fiber tend to decrease. On the other hand, if the molecular weight of the polyether exceeds 5000, the compatibility will decrease during block copolymerization with the polyester, which is the hard segment, and the homogeneity of the resulting polyetherester elastic fiber will decrease, which in turn will reduce the stretchability. There is a tendency to

The weight ratio of polyether to polyester in the block copolymer is preferably polyether / polyester = 0.65 to 4.0 / 1. When the weight ratio of the polyether to the polyester is less than 0.65, the elasticity of the obtained polyetherester elastic fiber tends to decrease. On the other hand, when the weight ratio of the polyether exceeds 4.0, the melting point of the block copolymer is greatly lowered, and the thermal properties of the polyetherester elastic fiber are deteriorated, and the polyether is elastic during the dyeing process or the heat treatment. The ester fibers tend to become brittle or deteriorate.

The polyether-polyester block copolymer may be copolymerized with other components in a small amount in order to improve the dyeability. When other components are copolymerized, the crystalline structure of the polyester, which is the hard segment, is disturbed, and the fixing points for expressing stretchability disappear, which may adversely affect stretchability. The amount is preferably 5 mol% or less.

Specific methods for producing the polyetherester elastic fiber described above include, for example, the following methods. First, the esterification reactor was charged with dimethyl terephthalate and 1,4-butanediol in a molar ratio of 1 / 1.6.
And the polyester is obtained by carrying out a transesterification reaction at a temperature of 160 to 230 ° C. for 2 to 5 hours under normal pressure. The obtained polyester was transferred to a polymerization vessel, the required amount of polytetramethylene glycol was added, and then 230-26
Polycondensation reaction is performed at a temperature of 0 ° C. under a reduced pressure of 1 Torr or less for 1 to 5 hours to obtain a block copolymer of polyester and polyether.

The polycondensation reaction is generally carried out in the presence of a polycondensation catalyst. As the polycondensation catalyst, titanium compounds, antimony compounds, tin compounds, calcium compounds, manganese compounds, germanium compounds and the like are used. Particularly preferred polycondensation catalysts are titanium compounds and antimony compounds. In addition, various stabilizers, pigments and the like may be added as needed during the production of the polyether ester.

The block copolymer obtained as described above is melt-spun and drawn or drawn and heat-treated to obtain a polyetherester elastic fiber. When performing stretching and heat treatment, if relaxation treatment is continuously performed after stretching,
It is possible to produce a polyetherester elastic fiber having further excellent performance.

Next, a fabric is manufactured by knitting and weaving using the elastic yarn in which the polyether ester elastic fibers are bundled. Generally, it is rare to obtain a fabric by using only this elastic yarn, and by combining this elastic yarn and a non-elastic yarn in which polyester fibers are bundled in an arbitrary form,
Fabrication is performed by knitting and weaving. For example, a method in which non-elastic yarns and elastic yarns are mixed and entangled with air to obtain mixed-fiber yarns, a hollow spindle is used as the core, and the non-elastic yarns are used as sheaths for covering yarns. First, a mixed-use yarn is manufactured by a method of obtaining a mixed-use yarn by applying a tension to the elastic yarn using a two-feed type twisting machine and twisting with an inelastic yarn The fabric is obtained by knitting and weaving using yarns.

As a knitting structure in the case of knitting, any conventionally known knitting structure such as a circular knitting structure such as a single knit or a double knit or a warp knitting structure such as a Russell or tricot is adopted. In the case of weaving, a twill weave design, a satin weave design or the like is adopted as the weave design. In the case of weaving, the mixed fiber yarn may be used for both the warp yarn and the weft yarn, or only one of the mixed fiber yarn may be used and the other yarn may be an arbitrary yarn.

Further, the non-elastic yarn and the elastic yarn may be combined at the time of knitting. For example, the non-elastic yarn is on the front side,
The knitted fabric may be knitted by splicing so that the elastic yarn is on the back side (inside the stitch formed by the non-elastic yarn). Since the non-elastic yarns are evenly arranged on the front side of the knitted fabric and the elastic yarns are uniformly arranged on the back side by knitting with the splicing knitting, the ultraviolet rays make the polyether ester elastic The fibers are more difficult to attack, and the polyetherester elastic fibers are less likely to become brittle. To make a specific knitting, the elastic yarn and the inelastic yarn are separately and regularly arranged at the two-hole yarn feeder of the knitting machine, and the tension of the yarn and the angle at which the yarn enters the knitting needle are adjusted. It is preferable to make it uniform. Furthermore, it is also possible to simply align the non-elastic yarns and the elastic yarns for weaving and knitting. Further, it is also possible to feed the non-elastic yarn and the elastic yarn to separate yarn feeders to form separate stitches for knitting.

As the thread form of the elastic thread, the non-elastic thread or the mixed fiber thread, a multifilament thread or a false twisted thread obtained by false twisting the multifilament thread, a knit The forms such as de-knit processed yarn and air-treated processed yarn are adopted.

When a cloth is obtained by using an elastic yarn made of polyetherester elastic fiber and a non-elastic yarn made of polyester fiber or the like, the proportion of the polyetherester elastic fiber in the cloth is 2 with respect to the weight of the cloth. It is preferably in the range of -60% by weight, and most preferably in the range of 5-20% by weight. If the proportion of the polyetherester elastic fiber is less than 2% by weight, the stretchability of the cloth tends to decrease. If the proportion of the polyetherester elastic fiber exceeds 60% by weight, the shrinkage ratio during heat treatment of the fabric tends to be too large, the fabric weight may be too heavy, or the fabric surface may be irritated. .

The present invention is characterized in that an aqueous solution containing a benzotriazole type ultraviolet absorber and a dyeing carrier in combination is applied to the cloth thus obtained, and then dyed. By taking such a means, it became possible to obtain a vivid color which could not be obtained by the conventional method of applying the benzotriazole-based ultraviolet absorber at the same time as dyeing.

As the benzotriazole type ultraviolet absorber, Cibatex LF (manufactured by Ciba Geigy), Cibatex LFN (manufactured by Ciba Geigy) and the like are used. The benzotriazole-based UV absorber used in the present invention has a wavelength of 290 to 400 nm as compared with UV absorbers such as salicylate-based, benzophenone-based, and benzoate-based UV absorbers.
Has extremely excellent ability to absorb ultraviolet rays, and even if it is applied to polyetherester elastic fibers, it does not hinder the high elasticity of the polyetherester elastic fibers and damages the polyetherester elastic fibers. There are few things to do. The use of the above-mentioned UV absorbers other than the benzotriazole-based UV absorbers is not preferable because the high stretchability of the polyetherester elastic fiber is hindered or the polyetherester elastic fiber is damaged.

The benzotriazole type ultraviolet absorber is preferably added in an amount of 0.1 to 8.0% by weight, and most preferably 0.5 to 5.0% by weight, based on the weight of the cloth.
When the amount of the benzotriazole-based ultraviolet absorber applied is less than 0.1% by weight, the polyetherester elastic fiber tends to become brittle due to ultraviolet rays. On the other hand, when the amount of the benzotriazole-based ultraviolet absorber applied exceeds 8.0% by weight, the high elasticity of the polyetherester elastic fiber is apt to be impaired, and a clear hue is exhibited at the time of dyeing in the subsequent process. Be careful because it tends to be difficult.

In the present invention, the above-mentioned UV absorber is used in combination with a dyeing carrier, and this dyeing carrier is also used in order to promote the adsorption of the benzotriazole-based UV absorber mainly applied to the polyetherester elastic fiber. In general, a commercially available carrier for dyeing polyester fibers such as methylnaphthalene type and chlorobenzene type is used. The carrier may be added in an amount of about 0.5 to 20% by weight based on the weight of the fabric, but 1.0
It is even more effective if added in the range of 10% by weight. If the amount of the carrier added is less than 0.5% by weight, the benzotriazole-based ultraviolet absorber is less likely to be adsorbed on the polyetherester elastic fiber, and the polyetherester elastic fiber tends to become brittle depending on the ultraviolet rays. On the other hand, if the amount of the carrier added exceeds 20% by weight, the offensive odor becomes strong and the effect of promoting the adsorption of the ultraviolet absorber cannot be improved, which is inefficient.

As a method for applying a dispersion containing a benzotriazole type ultraviolet absorber and a dyeing carrier to a cloth, the cloth may be dipped in the dispersion and squeezed with a mangle, or the above dispersion using a nozzle or the like. Examples thereof include a method of spraying the liquid onto the cloth and applying the liquid.

After applying the benzotriazole-based UV dye to the cloth, it is heat-treated. This heat treatment is performed in order to firmly fix the benzotriazole-based ultraviolet absorber to the polyetherester elastic fiber or polyester fiber or the like, and to enhance the durability such as washing.

The heat treatment is performed in the temperature range of 80 to 170 ° C. for 5 hours.
~ 300 seconds, preferably in the temperature range of 100-160 ° C for 20-120 seconds. Here, the heat treatment temperature is 80
If the temperature is lower than ℃, the adhesion of the benzotriazole-based UV absorber will be weak and the durability will be poor, and if the temperature exceeds 170 ° C, the benzotriazole-based UV absorber will be firmly fixed. If the strength of the ether ester-based elastic fiber is greatly reduced, high stretchability is hindered, which is not preferable.

After the heat treatment, in the present invention, dyeing is performed according to a usual dyeing method for polyester fiber cloth. Usually, when such processing is carried out, an ultraviolet absorber is added to the dye bath so that the ultraviolet absorber is absorbed inside the fiber during dyeing, but at this time, the hue tends to become dull. According to the method of the present invention, since the ultraviolet absorber is adsorbed mainly on the polyetherester elastic fibers located inside the fabric, a clear hue can be obtained at the time of dyeing in the subsequent step and the long time can be obtained. A light-resistant highly stretchable fabric that exhibits good stretchability over the entire length can be obtained.

The present invention has the above configuration.

[0033]

[Operation] According to the conventional method in which a benzotriazole-based UV absorber is treated on a cloth in the same bath at the time of dyeing, it is difficult to obtain a vivid color because the adsorption of the dye to the fiber is hindered. When the benzotriazole-based UV absorber and the dyeing carrier are used together and applied to the fabric, the UV absorber is adsorbed around the polyetherester-based elastic fibers located inside the fabric. When the fabric is dyed in the state, it will not be affected by the UV absorber in the dyeing bath during dyeing, so it will be possible to dye in a clear color, and the action of the UV absorber provided will make it possible to use natural light. It is possible to obtain a light-resistant and highly stretchable fabric in which the stretchability is less likely to decrease even if the fabric is exposed to the bottom for a long time.

[0034]

EXAMPLES Next, the present invention will be described in more detail by way of examples. The measurement and evaluation of the performance of the samples in the examples were carried out by the following methods. (1) Elongation rate and recovery rate It was measured by the constant rate elongation method of JIS L-1018. (2) Strength and Elongation Using Tensilon UTM-4-100 manufactured by Orientic Co., an elastic yarn having a length of 10 cm was measured 10 times at a tensile speed of 10 cm / min, and the average value thereof was calculated. . (3) Intrinsic Viscosity An equal weight mixture of phenol and ethane tetrachloride was used as a solvent and measured at a temperature of 20 ° C.

(4) Elastic Recovery Rate Using Tensilon UTM-4-100 type manufactured by On Entic Co., an elastic yarn with a length of 10 cm is stretched 100% at a pulling speed of 10 cm / min. After stretching, the elastic yarn is returned to its original length at the same speed. Then, the length of elongation of the elastic yarn at the time when it was re-stretched and the stress was observed was calculated, and the elastic recovery rate was calculated by the following formula. The elastic recovery rate is an average value measured 10 times. Elastic recovery rate = [(E ₀ −E ₁ ) / E ₀ ] × 100 where E ₀ is the length of elongation when the elastic yarn is extended by 100%, and when the elastic yarn is 10 cm It becomes 10. E ₁ is the length of elongation of the elastic yarn at the time when stress is observed when it is re-extended. (5) Hot water shrinkage rate Fix one end of the yarn, apply an initial load of 1/10 g / d to the other end, measure 500 mm correctly, and mark 2 points. After that, take an initial load, immerse in boiling water for 30 minutes, take out, lightly drain the water with a blotting paper or cloth, and naturally dry in a horizontal state. Then, the initial load is applied again and the length L (mm) between the two points is measured. The above L (mm) is measured 10 times each, the shrinkage rate is calculated by the following formula, and the average value thereof is taken as the hot water shrinkage rate (%). Hot water shrinkage = [(500-L) / 500] x 100

Example 1 First, a polyetherester elastic fiber was obtained as follows. Dimethyl terephthalate 19.4 in the esterification reactor
210 g of 1,4-butanediol was charged under normal pressure with 10 g of tetrabutyl titanate as a catalyst.
A transesterification reaction was performed at 2 ° C. for 2 hours and 30 minutes. The obtained polybutylene terephthalate was transferred to a polymerization vessel and polytetramethylene glycol (weight average molecular weight 2000) 3
3 kg and 50 g of an antioxidant (Irganox 1010 manufactured by Ciba-Geigy Co., Ltd.) were added, and a polycondensation reaction was performed under reduced pressure at a temperature of 250 ° C. for 3 hours. The intrinsic viscosity [η] of the thus obtained block copolymer of polyester and polyether was 2.25. This block copolymer was dried under reduced pressure, melt-spun with a melt spinning machine at a spinning temperature of 230 ° C. and a discharge rate of 40 g / min, and then a silicone-based oil agent was adhered to the spun yarn by a roller lubrication method to obtain 1000 m / min.
The undrawn yarn was wound up at a speed of a minute.

Next, this undrawn yarn was introduced into a drawing heat treatment machine, the drawing speed was 200 m / min, and the drawing ratio was 2.50 in the drawing zone.
Double and relaxation heat treatment area 0.70 times, heat treatment plate temperature 140
An elastic yarn made of a polyetherester elastic fiber was obtained under the conditions of ° C and a winding tension of 1 g. This elastic yarn was 50 denier / 3 filament, and the elastic recovery rate was 96%. The hot water shrinkage of this polyetherester fiber was 33%.

On the other hand, as the inelastic yarn, a false twisted yarn obtained by false twisting a normal polyester fiber 75 denier / 36 filament multifilament yarn was prepared. The hot water shrinkage of this non-elastic yarn was 5%.

Using the above-mentioned elastic yarn and non-elastic yarn,
It was knitted with the knitting structure shown in FIG. In the knitting structure diagram shown in FIG. 1, eight yarn feeders are repeated as one repeat, and the surface of the knitted fabric has a plain tone and the back side has a concave and convex tone. Figure 1
In the figures, (ac) and (bc) indicate two types of cylinder needles having different bat positions, and (ad) and (bd) show two types of dial needles having different butt positions. The elastic yarns are indicated by dotted lines, and the non-elastic yarns are indicated by solid lines. FIG. 2 is a schematic view of a yarn feeder used for splicing knitting,
(Α) and (β) indicate the yarn feeding holes, (A) indicates the elastic yarn,
(B) shows an inelastic yarn. (N) indicates a knitting needle.

The elastic yarn and the non-elastic yarn in the knitting structure diagram of FIG. 1 and the knitting method will be described in more detail as follows. That is, at the first yarn feeder (hereinafter, the yarn feeder is expressed as “F”), the front and back of the knitted fabric are tucked with a cylinder (ac) needle and knitted with a dial (ad) (bd) needle. Knot. The 3rd F has the same action as the 1st F, and in the 5th and 7th F, the tuck knitting of the cylinder (bc) needle and the knitting of the dial (ad) (bd) needle are performed. Inelastic yarns were fed to each of the above-mentioned yarn feeders. On the other hand, in 2F, 4F, 6F and 8F, using the yarn feeder shown in FIG.
A non-elastic yarn is fed into the hole and knitted with a cylinder (ac) and (bc) needle. With the above knitting structure and knitting method, using the double knitting machine LPJ-H type made by Fukuhara Seiki,
A knitted fabric (fabric) was obtained by knitting with a shuttle diameter of 33 ″ and a gauge of 28G.

To the knitted fabric obtained as described above, a circular jet dyeing machine manufactured by Hisaka Seisakusho Co., Ltd. was used, and 1 g of a surfactant "Sunmor FL" manufactured by Nikka Kagaku Co., Ltd. was used.
/ L liter aqueous solution at 80 ° C. for 10 minutes for relaxing scouring, dehydration and drying.

Next, an aqueous solution containing 20 g / liter of Cibatex LFN (manufactured by Ciba-Geigy, benzotriazole type ultraviolet absorber) and 30 g / l of IP carrier A-17 (manufactured by Yatasha Oil and Fat Co., Ltd., polyester fiber dyeing carrier) is used. After padding with 80% pickup and drying at a temperature of 110 ° C., using a heat setter (pin tenter) manufactured by Ichikin Kogyo Co., Ltd.,
Heat setting was performed at 160 ° C. for 60 seconds.

Thereafter, the disperse dye solution having the composition of the following formulation 1 was used and dyeing was carried out at a temperature of 130 ° C. for a time of 30 minutes using a circular jet dyeing machine manufactured by HISAKA MFG.

Formulation 1 Diane red thread U-SE 1.0% owf (manufactured by Mitsubishi Kasei Co., Ltd., disperse dye) Sunsalt RZ-8 0.5 g / liter (manufactured by Nichika Chemical Co., Ltd., leveling agent) Acetic acid ( 48%) 0.2cc / liter

After dyeing, a heat setter made by Ichikin Kogyo Co., Ltd. was used and heat treatment was performed at 150 ° C. for 30 seconds also as a finishing set. The highly stretchable fabric obtained as described above exhibited a clear red color with a width of 130 cm and a basis weight of 390 g / m ² .

For the purpose of comparison with the present invention, the same procedure as in this example was used, except that the single treatment with Cibatex LFN was omitted in this Example and the following Formulation 2 containing Cibatex LFN was used in place of Formulation 1. A highly stretchable fabric (Comparative Example 1) was obtained.

Formulation 2 Dyanic Thread U-SE 1.0% owf (manufactured by Mitsubishi Kasei Co., Ltd., disperse dye) Sunsalt RZ-8 0.5 g / liter (manufactured by Nichika Chemical Co., Ltd., leveling agent) Acetic acid ( 48%) 0.2 cc / liter Cibatex LFN 2.0% owf (Ciba Geigy benzotriazole type UV absorber)

For comparison with this example, a highly stretchable fabric for comparison (Comparative Example 2) was obtained in exactly the same manner as this Example except that the treatment step with Cibatex LFN was omitted in this Example. It was

The stretchability, that is, the elongation ratio and the recovery ratio, of the high-stretch fabrics of the present invention and the comparative fabric were measured before and after exposure to natural light, and the results are shown in Table 1. Also,
The high-stretch fabric before and after irradiation with a carbon arc fade meter was unwoven, and an elastic yarn made of polyetherester elastic fiber was taken out, and the strength and elongation of this elastic yarn were measured. On the other hand, the obtained high-stretch fabric was repeatedly washed, and then the high-stretch fabric was unknitted to take out an elastic yarn made of polyetherester elastic fiber, and the strength and elongation of this elastic yarn were measured. These results are also shown in Table 1.

[0050]

[Table 1]

The items of the sample in Table 1 are as follows. 1) Untreated highly stretchable fabric The obtained highly stretchable fabric is used as it is without being exposed to natural light. 2) High stretch fabric after exposure to natural light Attach the obtained high stretch fabric to the direct exposure table,
The exposed surface faces the south side and is left for 30 days at an elevation angle of 45 °. 3) Elastic yarn that is unknitted from untreated highly stretchable fabric An elastic yarn that is obtained by unknitting the obtained highly stretchable fabric before exposure to natural light.

4) Elastic yarn unwoven from highly stretchable fabric after carbon arc irradiation Using the carbon arc fade meter used in JIS L-0842, the obtained highly stretchable fabric was heated at a temperature of 63 ° C. for 40 hours. This is an elastic yarn that was taken out after being subjected to irradiation treatment. 5) Elastic yarn unwoven from highly stretchable fabric after repeated washings Using a household washing machine, using 0.9g / l of synthetic detergent (liquid), with a bath ratio of 1:40 and a water temperature of 40 ° C. The resulting highly stretchable fabric was subjected to the next cycle of washing for 10 minutes. The cycle of washing is: water supply → detergent injection → washing → drainage →
Dehydration → water supply → rinse → drainage → water supply → rinse / drainage → water supply → rinse → drainage → dehydration. This elastic yarn was taken out of the highly stretchable fabric after repeating this cycle 100 times.

As is clear from the comparison of the high-stretch fabric according to the present invention with the high-stretch fabric according to the comparative example in Table 1, before exposure to natural light or carbon arc,
The high-stretch fabric and the elastic yarns constituting the same have the same elongation rate, recovery rate, strength, and elongation, while the invention of the present invention is not effective after exposure to natural light or carbon arc. The high-stretch fabric or the elastic yarns constituting the high-stretch fabric according to the present invention are not easily deteriorated in elongation rate, recovery rate, strength and elongation, and have a clear color. In Example 1, no vivid color is obtained, and in Comparative Example 2, the elongation rate and the like are greatly reduced. Therefore, it can be seen that the highly stretchable fabric according to the present invention has a vivid color, its stretchability does not easily decrease even when exposed to natural light, etc., and maintains good stretchability for a long period of time. Further, it can be seen that the highly stretchable fabric according to the present invention does not cause a decrease in the strength and elongation of the elastic yarns constituting the fabric even after repeated washing, and has no problem in practicality.

[0054]

EFFECTS OF THE INVENTION According to the method of the present invention, the highly stretchable fabric obtained does not easily lose its stretchability due to natural light or the like, maintains the stretchability excellent in light resistance for a long period of time, and has a clear color. ing. The cloth according to the present invention having such properties can be suitably used for clothing, industrial use and the like.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a knitting structure when a cloth used in the present invention is obtained.

FIG. 2 is a diagram showing an example of a knitting method for obtaining a fabric used in the present invention.

[Explanation of symbols]

 ad dial needle bd dial needle ac cylinder needle bc cylinder needle A elastic yarn B inelastic yarn N knitting needle α yarn feeding hole β yarn feeding hole

Claims (1)

[Claims] 1. A polyether ester system formed from a block copolymer comprising a polyester mainly composed of polyethylene terephthalate or polybutylene terephthalate as a hard segment and a polyether mainly composed of linear polyalkylene glycol as a soft segment. An aqueous solution containing a benzotriazole-based UV absorber and a dyeing carrier was applied to a fabric containing elastic fibers,
A method for producing a highly stretchable fabric, which comprises heat-treating at up to 170 ° C and then dyeing.