JPH11172583A - Production of hygroscopic fiber structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a hygroscopic fiber structure simultaneously satisfying both excellent hygroscopicity and high color fastness by dyeing a fiber structure containing a specific hygroscopic resin with a treating liquid containing a dyestuff and an inorganic salt. SOLUTION: This method for producing a hygroscopic fiber structure having good color fastness comprises dyeing a fiber structure comprising polyester fibers and/or polyamide fibers and containing 5-35 wt.% of a hygroscopic resin having a moisture absorption coefficient different of >=10%, such as a blocked polyetherester, in a treating liquid containing a prescribed amount of the dyestuff and at least one kind of inorganic salt selected from the group consisting of sodium sulfate, potassium chloride, ammonium sulfate and ammonium chloride in a 3 wt.% concentration.

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 hygroscopic fiber structure, and more particularly, to a method for producing a material for clothing such as innerwear, middle garment and sports clothing, which has high dyeing fastness while maintaining excellent moisture absorption. A method for producing a hygroscopic fibrous structure that satisfies the requirements.

[0002]

2. Description of the Related Art Thermoplastic synthetic fibers represented by polyesters and polyamides are widely used in various apparel applications and industrial applications because of their excellent mechanical strength, chemical resistance and heat resistance. However, since these thermoplastic synthetic fibers generally have low hygroscopicity, when they come into direct contact with the skin of the human body, such as innerwear, inner garments, and sports clothing, or are worn in a state close to the skin, sweating from the skin causes stuffiness and stickiness. In fact, the range of application to the garment field is limited because of the tendency to occur.

As a method for improving the hygroscopicity of the above-mentioned thermoplastic synthetic fiber, for example, Japanese Patent Publication No. 60-475, Japanese Utility Model Publication No. 60-40612 and Japanese Patent Application Laid-Open No.
In Japanese Patent No. 215835 and the like, by mixing or aligning synthetic fibers with fibers having a high equilibrium moisture content (hygroscopicity),
There has been proposed a method for improving the comfort of absorbing moisture as a fabric.

[0004] However, although these conventional methods certainly improve the hygroscopic comfort of synthetic fibers, when synthetic fibers are dyed with a commonly used disperse dye, they cause staining or impair the same color. Alternatively, there is a problem in that the physical properties inherent in the synthetic fibers are lost because of the disadvantage that the color fastness is lowered. As a method of imparting hygroscopicity at the stage of producing synthetic fibers, for example, Japanese Patent Application Laid-Open No. 2-9 / 1990
No. 9612 proposes a core-sheath type composite fiber in which a hygroscopic resin having a moisture absorption of 10% or more is used as a core component and polyester is used as a sheath component. However, due to the high hygroscopicity of the core component, the sheath component is distorted due to the swelling of the core component during hot water treatment such as dyeing, so that the fiber surface has a crack called a sheath cracking phenomenon. And the hygroscopic resin of the core component flows out to the fiber surface, which is liable to cause troubles in higher-order processes.

Japanese Patent Application Laid-Open No. 52-55721 discloses that a void (hollow portion) is formed near the core component in order to cope with the swelling of the core component (hygroscopic resin) in the composite fiber. A proposed method has been proposed. However, according to this method, a significant reduction in the sheath cracking phenomenon is certainly observed in a fabric using raw silk, but on the other hand, a twisted yarn (strong twisted yarn) is used.
When subjected to the twisting process such as or false twisted yarn, the cross-sectional change due to external force due to the hollow part of the core increases, and the sheath cracking phenomenon occurs in the weight reduction process and the dyeing process,
There was a drawback that color fastness and various physical properties were easily reduced.

It has been one of the problems in the industry to obtain a hygroscopic fiber structure that satisfies both the hygroscopic property and the color fastness as described above.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for producing a hygroscopic fiber structure, which can simultaneously satisfy both excellent hygroscopicity and high color fastness.

[0008]

According to the present invention, there is provided a method for producing a hygroscopic fiber structure, wherein the fiber structure containing a hygroscopic resin is dyed with a treatment solution containing a dye and an inorganic salt. It is characterized by doing. According to the present invention, by coexisting an inorganic salt with the dye of the dyeing treatment liquid, the swelling of the hygroscopic resin in the fiber structure is suppressed in the dyeing step, thereby eliminating the fiber sheath cracking phenomenon. it can. Therefore, by eliminating the sheath cracking phenomenon, it is possible to satisfy the high dyeing fastness of the fiber while maintaining excellent hygroscopicity by the hygroscopic resin.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, the fiber-forming polymer constituting the fiber structure includes polyolefin polymers such as polyethylene and polypropylene, and polyester polymers such as polyethylene terephthalate, polypropylene terephthalate and polybutylene terephthalate. And polyamide-based polymers such as nylon 6 and nylon 66, and copolymers containing these as main components. Among them, as the synthetic fiber structure for clothing, a polyester polymer and a polyamide polymer mainly composed of polyethylene terephthalate are preferably used.

The above-mentioned fibrous structure preferably contains a synthetic polymer in an amount of 50% by weight or more, preferably 65% by weight or more, but is a mixed product in which natural fibers or other fibers are mixed. There is no problem. As the hygroscopic resin used in the present invention, for example, block polyetherester copolymerized with polyalkylene glycol,
Copolymers such as block polyether amide and block polyester ether amide can be mentioned.
Among these, block polyetheresters are most preferable, particularly in view of heat resistance and hygroscopicity.

As the hygroscopicity that the hygroscopic resin should have, the difference in the hygroscopicity (hygroscopic difference ΔMR) as measured by the measuring method described below is 10% or more, preferably 15% or more. Is preferred. In the present invention, the hygroscopicity of the hygroscopic resin is determined by measuring the weight of the polymer chip obtained by cutting the polymer chip into a cube of 2 mm square, or the fiber obtained by cutting the original yarn into a tubular knitted fabric, and the weight W ₁ at the time of the absolute dryness. ° C. × 65% RH and 30 ℃ × 90% RH atmosphere under a thermo-hygrostat (Tabai Co. PR-2G) weight W after moisture absorption after standing for 24 hours in ₂₁
And W ₂₂ was measured, moisture absorption from these by the following equation MR1
And MR2, respectively.

Moisture absorption rate MR1 (%) = [(W ₂₁ −W ₁ ) / W ₁ ] × 100 (1) Moisture absorption rate MR 2 (%) = [(W ₂₂ −W ₁ ) / W ₁ ] × 100 (2) Then, as a difference between the equations (1) and (2), the difference of the moisture absorption rate ΔMR (%) obtained from the following equation (3) is used as the moisture absorbing resin used in the present invention. Is a parameter of hygroscopicity.

The difference in moisture absorption ΔMR (%) = MR2−MR1 (3) The difference in moisture absorption ΔMR is used to obtain comfort by discharging moisture in clothes when the clothes are worn to the outside air. It is a driving force, which is the temperature and humidity inside clothes represented by 30 ° C. × 90% RH and the outside air temperature represented by 20 ° C. × 65% RH when performing light to medium work or light to medium exercise. This corresponds to the difference in moisture absorption.

The greater the difference ΔMR in moisture absorption, the higher the hygroscopicity and the better the comfort when worn. This means that the hygroscopic resin used in the present invention has
Desirably, it is at least 10%, more preferably 15% or more. Also, the difference in moisture absorption rate in the state of the fiber structure ΔMR
If it is at least 1% or more, the comfort when worn can be improved.

The fiber form of the fibrous structure containing the hygroscopic resin is not particularly limited, but is preferably a core-sheath type having a hygroscopic resin as a core component and an ordinary fiber-forming polymer as a sheath component. Composite fiber, core-sheath type composite hollow fiber having a hollow portion coexisting with its core component, sea-island type composite fiber having a hygroscopic resin as an island component, and a normal fiber-forming polymer as a sea component, a hygroscopic resin and a normal Examples thereof include side-by-side conjugate fibers bonded with a fiber-forming polymer, and blend fibers obtained by mixing and spinning a hygroscopic resin and a general fiber-forming polymer. Among them, core-sheath composite fibers and core-sheath composite hollow fibers in which the hygroscopic resin is the core component and the fiber-forming polymer is the sheath component are preferred.

The content occupied by the hygroscopic resin in the fiber structure is determined by the hygroscopic property of the hygroscopic resin (the difference in the hygroscopic rate 吸
The higher the (MR), the lower the content of the fibrous structure, the lower the moisture absorption effect can be obtained. Because it is necessary to set the amount to be contained in the fiber structure high to obtain the same moisture absorption performance,
There is a concern about a strong decline.

Therefore, in the present invention, the content of the hygroscopic resin in the fiber structure is preferably 5 to 5.
The content is preferably set to 35% by weight, more preferably 10 to 20% by weight, and most preferably 10 to 15% by weight. If the content of the hygroscopic resin is less than 5% by weight, sufficient hygroscopicity cannot be expected, and if it is more than 35% by weight, the fiber strength is reduced.

The method for producing a hygroscopic fiber structure according to the present invention comprises:
It is characterized in that the above-mentioned fiber structure is dyed using a treatment liquid obtained by adding an inorganic salt to a dye. The form of the fiber structure at the time of dyeing the fiber structure is not particularly limited, and may be in the form of a yarn or a cloth. In the case of a yarn form, any of a filament and a staple may be used, but it is preferable to dye as a filament having a small yarn end face. The form of the fabric may be any of a woven fabric, a knitted fabric, and a nonwoven fabric.

The dye used in the present invention is not particularly limited as long as it can dye a fiber structure containing a hygroscopic resin into a desired color tone. For example, when dyeing a fiber structure mainly composed of polyester fibers, disperse dyes and cationic dyes can be used, and when dyeing fiber structures mainly composed of polyamide fibers, acid dyes and Complex hydrochloric acid dyes can be used. In some cases, fluorescent dyes can be used.

The inorganic salt used in the treatment solution is an inorganic compound formed by a neutralization reaction between an acid and a base, and is composed of a negative component of an acid and a positive component of a base.
Those having H in the range of 5 to 9 are preferred. By using this inorganic salt in combination, swelling of the hygroscopic resin can be efficiently suppressed. Examples of the type of these inorganic salts include sodium sulfate, potassium chloride, ammonium sulfate, and ammonium chloride. From the viewpoint of the effect of suppressing the swelling of the hygroscopic resin and the cost, sodium sulfate is most preferable.

In the present invention, the content of the inorganic salt in the treatment liquid is preferably at least 3% by weight in order to achieve the object of the present invention of suppressing swelling of the hygroscopic resin and preventing fiber sheath cracking. It is preferable to set the above, and to obtain an optimum effect, it is desirable to set the content to 5% by weight or more. The dyeing conditions may be in accordance with the method of dyeing the material fibers such as polyester fibers and polyamide fibers constituting the fiber structure, but the dyeing temperature is about 5 to 10 ° C. higher than the dyeing temperature usually used for these. It is recommended to set the temperature (maximum temperature).

According to the method for producing a hygroscopic fiber structure of the present invention, the dyeing treatment solution contains an inorganic salt in addition to the dye. No significant change is observed in the exhaustion rate of the material, and the sheath cracking phenomenon of the fiber can be eliminated by efficiently suppressing the swelling of the hygroscopic resin. After completion of the dyeing of the fiber structure, a reduction washing or soaping step can be incorporated as necessary. In addition, a finishing agent can be provided as long as it does not impair the hygroscopicity of the fibrous structure based on the hygroscopic resin.

The hygroscopic fiber structure obtained as described above satisfies both excellent hygroscopicity and high color fastness at the same time, and the clothes and the like formed therefrom have a dry touch that satisfies the wearing comfort. Because it has hygroscopicity, especially inners, shirts and blouses, inner garments, sportswear,
Slacks, clothing materials such as outer garments, and sheets,
Suitable as bedding material such as futon cover.

[0024]

EXAMPLES Examples 1 and 2 and Comparative Examples 1 to 3 (Production of hygroscopic resin) 194 parts of dimethyl terephthalic acid
135 parts of ethylene glycol, 26.6 parts of dimethyl 5-sodium sulfoisophthalate (SSIA), 7.5 parts of trimethyl trimellitate (TMTM) and 0.1 part of tetrabutyl titanate were added to the reactor.
After transesterification while distilling off methanol at a temperature of 0 ° C., an ethylene glycol solution containing 0.08 part of trimethyl phosphate, 328 parts of polyethylene glycol having a molecular weight of 4000, and Irganox 101 as an antioxidant were used.
0 (manufactured by Ciba Geigy), 0.2 parts of silicon as an antifoaming agent and 0.1 parts of tetrabutyl titanate were added, and polymerization was carried out at 250 ° C. for 4 hours under a reduced pressure of 1.0 mmHg. A hygroscopic resin of a copolymerized polyester was obtained.

The proportion of polyethylene glycol copolymerized with this copolymerized polyester was 60%, and the difference in moisture absorption ΔMR was 28%. (Production of a fibrous structure) Using the copolymerized polyester (hygroscopic resin) obtained above as a core component,
Core / sheath type composite fiber a having a core / sheath ratio of 15/85 (weight) having polyethylene / terephthalate (PET) as a sheath component, the above-mentioned copolymerized polyester (hygroscopic resin) as a core component, and nylon 66 as a sheath component. Core / sheath = 15/8
A core-sheath type composite fiber b having a ratio of 5 (weight) and a fiber c made of polyethylene terephthalate alone were produced.

Each of the above three types of fibers is formed into a tubular knit,
These tube stitches were dyed under the following dyeing conditions a and b, reduced and washed by a conventional method (80 ° C.), and then dried. Further, 0.4 g of the stained sample was immersed in 25 g of acetone for 1 hour, and then 625 was measured using a spectrophotometer.
The dye detachability was evaluated by a simple method for determining sheath splitting by measuring the absorbance in nm, and the moisture absorption difference ΔMR was evaluated.
Table 1 shows the measurement results.

[Dyeing Conditions A] Dye: Samron Blue GSL-400 (Disperse dye manufactured by Dystar) 1.0 owf% Inorganic salt: Use of 20% by weight aqueous solution of anhydrous sodium sulfate Dyeing temperature (° C): 130 Dyeing time (min) : 60 Bath ratio: 1: 50 [Dyeing condition b] Dye: Samron Blue GSL-400 (Disperse dye manufactured by Dystar) ... 1.0 owf% Inorganic salt: No addition Dyeing temperature (° C): 130 Dyeing time (min): 60 Bath ratio: 1:50

[0028]

[Table 1]

From the results shown in Table 1, it can be seen from the results of Table 1 that in the case of the production method of the present invention (Examples 1 and 2) in which a dyeing solution containing an inorganic salt was dyed under dyeing conditions (a) (Examples 1 and 2).
Since the MR is 1% or more and the absorbance is extremely small, it is possible to obtain a fiber satisfying both the hygroscopicity and the color fastness. However, when ordinary dyeing without adding an inorganic salt was performed according to the dyeing condition b (Comparative Examples 1 and 2), the difference in moisture absorption rate ΔM
Although R satisfies the hygroscopicity of 1% or more, the absorbance is high and the color fastness is poor.

In the conventional dyeing (dyeing condition B) of the conventional fiber of polyethylene terephthalate alone (Comparative Example 3), only a fiber having poor hygroscopicity was obtained. Reference Examples 1 to 14 Using the hygroscopic resin (copolymerized polyester) obtained in the above Examples 1 and 2, monofilaments having a fineness of 500 d were formed, and the monofilaments were treated with the following treatment solution A, respectively.
To E and the swelling property in the longitudinal direction when treated under the following treatment conditions was measured. The results are shown in Table 2.

[Treatment liquid] A: 10% by weight aqueous solution of anhydrous sodium sulfate B: 20% by weight aqueous solution of anhydrous sodium sulfate C: 20% by weight aqueous solution of ammonium chloride D: 15% by weight aqueous solution of ammonium sulfate E: Water [Treatment conditions] Treatment temperature ( C): 40, 50, 60, 80, 100, 130 Processing time (min): 60 Bath ratio: 1: 200 Processor: LABOMAT (manufactured by Mathis).

[0032]

[Table 2]

From the results in Table 2, it can be seen that when treated with a treatment liquid containing an inorganic salt (Reference Examples 1 to 8), the swellability of the hygroscopic resin is extremely low, and the swellability increases as the concentration of the inorganic salt increases. It can be seen that there is a tendency to decrease. On the other hand, when treated with water containing no inorganic salt (Reference Examples 9 to 14), it can be seen that the swelling property of the hygroscopic resin is extremely large, and that the swelling property tends to increase as the treatment condition becomes lower in the temperature range. .

From this reference example, it can be seen that according to the present invention in which the dyeing treatment is carried out with a dyeing solution containing an inorganic salt, the swellability of the hygroscopic resin in the fiber structure is suppressed, and the object of the present invention is achieved. Can be estimated.

[0035]

As described above, according to the production method of the present invention, the swelling of the hygroscopic resin in the fibrous structure can be suppressed by adding the inorganic salt to the dyeing treatment liquid, whereby the fiber It is possible to obtain a hygroscopic fibrous structure that maintains good dyeing fastness without causing sheath cracking and has excellent hygroscopicity.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI A41D 31/00 503 A41D 31/00 503G

Claims (6)

[Claims] 1. A method for producing a hygroscopic fiber structure, comprising dyeing a fiber structure containing a hygroscopic resin with a treatment liquid containing a dye and an inorganic salt. 2. The method according to claim 1, wherein a difference ΔMR in moisture absorption of said hygroscopic resin is 10.
%. The method for producing a hygroscopic fiber structure according to claim 1, wherein 3. The method for producing a hygroscopic fiber structure according to claim 1, wherein the content of the hygroscopic resin contained in the fibrous structure is 5 to 35% by weight. 4. The method for producing a hygroscopic fiber structure according to claim 1, wherein the fiber structure is made of a polyester fiber and / or a polyamide fiber. 5. The method for producing a hygroscopic fiber structure according to claim 1, wherein said inorganic salt is at least one selected from the group consisting of sodium sulfate, potassium chloride, ammonium sulfate and ammonium chloride. 6. The method according to claim 1, wherein the concentration of the inorganic salt in the processing solution is 3 or less.
The method for producing a hygroscopic fiber structure according to any one of claims 1 to 5, which is not less than% by weight.