CN113710838A

CN113710838A - Swimming suit

Info

Publication number: CN113710838A
Application number: CN202080025958.XA
Authority: CN
Inventors: 铃木克哉; 田中利宏; 上林达昭; 松永桂一郎; 柄泽留美; 笠原敬子; 田中启之; 水口爱
Original assignee: Mizuno Corp; Toray Industries Inc
Current assignee: Mizuno Corp; Toray Industries Inc
Priority date: 2019-04-01
Filing date: 2020-03-24
Publication date: 2021-11-26
Anticipated expiration: 2040-03-24
Also published as: AU2020250382A1; JP2020169400A; WO2020203432A1; KR20210144691A; EP3951036A1; US20220022566A1; CA3135918A1; TWI719871B; JP7138071B2; EP3951036B1; CN113710838B; TW202100831A; EP3951036A4; SG11202109845UA

Abstract

A swimsuit (23) comprising a polyurethane elastic yarn, wherein the polyurethane elastic yarn contains a cationic high-molecular weight compound A having a number average molecular weight of 2000 or more in a range of 0.5 to 10 mass% and an inorganic chlorine deterioration inhibitor B, wherein the mass ratio of the cationic high-molecular weight compound A/the inorganic chlorine deterioration inhibitor B satisfies a range of 0.3 to 3, and a silicone oil is applied thereto, and the swimsuit fabric is subjected to water repellent processing. The swimsuit (23) preferably contains a polyurethane elastic yarn having a fluorine (F)/carbon (C) ratio of 0.030 or more in the element mass concentration of scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDX) on the polyurethane elastic yarn. Thus, the swimwear having high waterproofness, low water retention and high buoyancy is provided.

Description

Swimming suit

Technical Field

The present invention relates to a swimsuit comprising polyurethane elastic yarn, which has high water repellency and is less likely to be wetted when immersed in water, and which can maintain a low water retention rate for a long period of time.

Background

In order to impart water repellency and oil repellency to clothing articles and industrial material articles made of fiber products, water-and oil-repellent agents made of fluorine-based compounds have been widely used.

However, it has been found that the above-mentioned fluorine-based water-and oil-repellent agent contains a compound which may affect living environment and living organisms, for example, perfluorooctanoic acid (hereinafter, PFOA), perfluorooctanesulfonic acid (hereinafter, PFOS) or the like, and therefore a fiber product using a fluorine-based water-and oil-repellent agent containing no such compound is desired.

PFOA is mixed as a trace amount of impurities in a fluorine-based water repellent during the production process of the water repellent, but the mechanism thereof is not clear. When the polyfluoroalkyl group has 8 or more carbon atoms and is decomposed by some influence, PFOA may be generated, and the following proposals are made: a water-and oil-repellent fabric obtained by applying a PFOA-free fluorine-based water-repellent agent and a crosslinking agent to a fluorine-based water-repellent agent having a polyfluoroalkyl group having 6 or less carbon atoms which does not generate PFOA even when decomposed (patent document 1); and a 2-layer structure in which a fluorine-based water-repellent compound having a PFOA and/or PFOS concentration of less than 5ng/g is fixed to the surface of a single fiber and the fluorine-based compound is fixed in a layer form or the like (patent document 2). However, they are inferior in all of water repellency to fluorine-based water repellents containing PFOA having 8 or more carbon atoms.

In order to improve the water-repellent performance, there has been proposed a method of fixing a polymer partially containing a specific fluoroalkyl alcohol (meth) acrylic acid derivative, a melamine resin, and a water-dispersible polyfunctional isocyanate-based crosslinking agent to the surface of a fiber via at least 1 selected from a sulfonic acid group-containing compound and a polyphenol-based compound fixed to the surface of the fiber (patent document 3). According to this method, although a low water retention rate can be obtained, the water-repellent performance is low when the article is immersed in water for a long period of time, compared with a fluorine-based water-repellent agent containing PFOA having 8 or more carbon atoms.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2007-270374

Patent document 2: japanese laid-open patent publication No. 2010-150693

Patent document 3: japanese patent laid-open publication No. 2014-194098

Disclosure of Invention

Problems to be solved by the invention

As described above, the conventional techniques have a problem in obtaining a highly waterproof swimwear, and a swimwear having high waterproofness, low water retention, and high buoyancy is also desired.

In order to solve the above-mentioned conventional problems, the present invention provides a swimsuit having high waterproofness, low water retention, and high buoyancy.

Means for solving the problems

The swimwear of the present invention is characterized by comprising a polyurethane elastic yarn, wherein the polyurethane elastic yarn contains a cationic high molecular weight compound A having a number average molecular weight of 2000 or more in a range of 0.5 to 10 mass% and an inorganic chlorine deterioration inhibitor B, the mass ratio of the cationic high molecular weight compound A/the inorganic chlorine deterioration inhibitor B satisfies a range of 0.3 to 3, the polyurethane elastic yarn is provided with a silicone oil, and the swimwear fabric is subjected to water repellent processing.

Effects of the invention

The invention can provide the swimsuit with high waterproofness, low water retention rate and high buoyancy by improving the waterproofness of the polyurethane elastic yarn. Such a swimsuit has an advantage of enabling swimming at high speed for swimmers and also has an advantage of enabling ordinary swimmers to swim easily.

Drawings

Fig. 1 is a schematic plan view of a stretch fabric used in swimwear according to an embodiment of the present invention, in which plain weave portions and double weft weave portions are alternately repeated.

Fig. 2 is a schematic plan view of a stretch fabric used in the swimsuit according to another embodiment of the present invention, which is a stretch fabric in which plain weave portions and double warp weave portions are alternately repeated.

Fig. 3A is a schematic top view and fig. 3B is a sectional view of the stretch fabric.

Fig. 4A is a schematic top view of a core-spun yarn used in the stretch fabric, and fig. 4B is a schematic top view of another embodiment of the core-spun yarn.

Fig. 5 is a schematic front view of a swimsuit using the stretch fabric.

Fig. 6 is a schematic rear view of a swimsuit using the stretch fabric.

Fig. 7A is a schematic front view of a male swimsuit using the stretch fabric, and fig. 7B is a rear view thereof.

Fig. 8 is a schematic explanatory view showing a buoyancy measurement method of a swimsuit using the stretch fabric.

Detailed Description

The present inventors have focused on elastic polyurethane filaments that have not received much attention so far in order to waterproof fiber materials such as swimwear, and have conducted various studies in order to improve the waterproofness of elastic polyurethane filaments themselves. As a result, it was found that when a specific polyurethane elastic yarn was selected, the compatibility with the water repellent was good.

The polyurethane elastic yarn contains a cationic high molecular weight compound A with a number average molecular weight of more than 2000 and an inorganic chlorine deterioration preventing agent B in a range of 0.5-10 mass%, and a silicone oil agent is added, wherein the mass ratio of the cationic high molecular weight compound A/the inorganic chlorine deterioration preventing agent B satisfies a range of 0.3-3. When the swimwear containing the polyurethane elastic yarn is subjected to waterproof processing, the swimwear has high waterproofness, is not easy to wet when immersed in water for a long time, and has excellent waterproof and oilproof performances with low water retention rate.

In the present invention, any treating agent can be used as the water repellent treating agent, but it is preferable to use a treating agent having a fluorine (F)/carbon (C) (hereinafter referred to as F/C) ratio of 0.030 or more in the element mass concentration of SEM-EDX on the polyurethane elastic yarn. In the element mass concentration of SEM-EDX on the polyurethane elastic fiber, an F/C ratio of 0.030 or more means that the amount of the fluorine-based water repellent attached is large, and when the F/C ratio is less than 0.03, the amount of the fluorine-based water repellent attached is small, and sufficient low wettability tends not to be obtained. The F/C ratio is more preferably 0.045 or more.

The waterproofing process of the present invention preferably comprises a waterproofing agent and a crosslinking agent. The crosslinking agent is preferably a melamine resin, a water-dispersible polyfunctional isocyanate crosslinking agent, or the like, and may be used by mixing them. Examples of the melamine resin include trimethylolmelamine and hexamethylolmelamine. The water-dispersible polyfunctional isocyanate-based crosslinking agent is not particularly limited as long as it is an organic compound having 2 or more isocyanate functional groups in the molecule, and examples thereof include toluene diisocyanate, hexamethylene diisocyanate, diphenylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate, triphenyltriisocyanate, xylylene diisocyanate, dicyclohexylmethane diisocyanate (diisocyanate), and the like. More preferably, the polyfunctional blocked isocyanate crosslinking agent is obtained by reacting a blocked compound (a compound obtained by heating an isocyanate adduct to 70 to 200 ℃ C. and regenerating an isocyanate group) with phenol, diethyl malonate, methylethylketoxime, sodium bisulfite, epsilon-caprolactam, or the like in a trimethylolpropane toluene diisocyanate adduct, a glycerol toluene diisocyanate adduct, or the like.

Preferably, the melamine resin is mixed in an amount of 1 to 40% by mass based on the solid content of the water repellent, and the polyfunctional isocyanate crosslinking agent is mixed in an amount of 1 to 10% by mass based on the solid content of the water repellent.

In the swimwear of the present invention, the polyurethane elastic yarn is preferably contained in an amount of 5 to 70% by mass, more preferably 5 to 60% by mass, even more preferably 5 to 50% by mass, and particularly preferably 5 to 40% by mass, based on 100% by mass of the swimwear. Thus, even if the elastic polyurethane yarn is included, the high waterproofness and the low water retention rate of the entire swimsuit can be maintained. As the other fiber yarn, synthetic fiber yarn such as polyester yarn, nylon yarn, polypropylene yarn, or the like can be used as desired.

The water repellency of the swimwear of the present invention is preferably class 4 or more, and more preferably class 5 in the spray test defined in JIS L1092. If the water repellency is 4 or more, it is suitable for swimwear and the like. The water retention percentage of the swimsuit after 60 minutes is preferably 50% by mass or less, more preferably 40% by mass or less, and further preferably 30% by mass or less of the swimsuit mass.

The polyurethane elastic yarn can be bare yarn or can be coated by other synthetic fiber yarns. The core-spun yarn can be single core-spun yarn or double core-spun yarn. As the swimwear, woven or knitted fabric having a structure in which the polyurethane elastic fiber yarn is covered with another synthetic fiber yarn is preferable. The other synthetic fiber yarns are not particularly limited, and may be synthetic fibers such as polyester synthetic fiber yarns typified by polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, or copolymerized polyester fiber yarns containing these as a main component, polyamide synthetic fiber yarns typified by nylon 6 and nylon 6, or polypropylene fiber yarns. Among them, polyamide-based or polyester-based filaments are preferable. From the viewpoint of strength and processability with polyurethane elastic yarn, polyamide fiber is preferable, and the fiber form and cross-sectional shape of synthetic fiber are not particularly limited, but in order to produce a highly elastic fabric, false twist processing is preferably performed in advance by a known method to impart crimp, but in order to reduce water retention, straight raw yarn with few voids between yarn and yarn is preferably used. Further, it is more preferable to reduce the gaps between the filaments by performing surface smoothing by a known method.

The tearing strength of the swimsuit defined in JIS L1096 is preferably 8N or more, more preferably 10N or more, and still more preferably 12N or more. This enables the tearing strength of the swimwear to be maintained at a high level. The breaking strength of the swimsuit defined in JIS L1096 is preferably 200kPa or more, more preferably 300kPa or more, and still more preferably 400kPa or more. This enables the breaking strength of the swimwear to be maintained at a high level.

The swimsuit is preferably at least one selected from the group consisting of a woven fabric and a knitted fabric. In the case of swimwear, a woven fabric is used for first-class players, and a woven fabric is often used for ordinary swimmers. By using the water-repellent agent for swimsuits, the wettability of the swimsuit in water can be suppressed even during swimming, and particularly, when the water-repellent agent is used as a swimsuit for a swimming match, the wetting of the swimsuit can be suppressed and the water resistance can be reduced during the swimming match. The buoyancy of the swimsuit fabric per 1g of the fabric is preferably 1.70g or more, more preferably 1.85g or more, and further preferably 2.00g or more. The buoyancy per 1g of the swimsuit is preferably 1.45g or more, and more preferably 1.50g or more. This provides an advantage that the swimmer can swim at high speed, and also provides an advantage that the ordinary swimmer can swim easily. The reason why the buoyancy of the swimsuit is lower than that of cloth is that the sewn portion and the like are wetted with water.

The polyurethane elastic yarn of the present invention is basically made of polyurethane or the like, and the polyurethane will be described first.

The polyurethane used in the present invention is not particularly limited, and any polyurethane may be used as long as it is a polyurethane starting from a polymer diol and a diisocyanate. The synthesis method is not particularly limited. That is, for example, a polyurethane urea composed of a polymer diol, a diisocyanate, and a low molecular weight diamine, or a polyurethane urethane composed of a polymer diol, a diisocyanate, and a low molecular weight diol may be used. The chain extender may be a polyurethaneurea using a compound having a hydroxyl group and an amino group in the molecule. It is also preferable to use polyfunctional diols, isocyanates, and the like having 3 or more functionalities within the range not affecting the effect of the present invention.

The polymer diol is preferably a polyether diol, a polyester diol, a polycarbonate diol, or the like. Further, polyether glycol is preferably used particularly from the viewpoint of imparting flexibility and elongation to the yarn.

As the polyether glycol, for example, polyethylene oxide, polyethylene glycol, a polyethylene glycol derivative, polypropylene glycol, polytetramethylene ether glycol (hereinafter abbreviated as PTMG), modified PTMG which is a copolymer of Tetrahydrofuran (THF) and 3-methyltetrahydrofuran, modified PTMG which is a copolymer of THF and 2, 3-dimethylthf, a polyol having side chains on both sides disclosed in japanese patent No. 2615131, a random copolymer in which THF and ethylene oxide and/or propylene oxide are irregularly arranged, and the like are preferably used. These polyether diols may be used by mixing or copolymerizing 1 or 2 or more kinds thereof.

Further, as the polyurethane elastic yarn, from the viewpoint of obtaining abrasion resistance and light resistance, it is preferable to use a polyester-based diol such as butanediol adipate, polycaprolactone diol, polyester polyol having a side chain disclosed in jp 61-26612 a and the like, polycarbonate diol disclosed in jp 2-289516 a and the like.

Such polymer diols may be used alone, or 2 or more kinds thereof may be mixed or copolymerized and used.

The molecular weight of the polymer diol is preferably 1000 or more and 8000 or less, more preferably 1500 or more and 6000 or less, from the viewpoint of obtaining elongation, strength, heat resistance and the like when the polymer diol is produced into a yarn. By using a polyol having a molecular weight within this range, an elastic yarn excellent in elongation, strength, elastic recovery force, and heat resistance can be easily obtained.

Next, as the diisocyanate, aromatic diisocyanates such as diphenylmethane diisocyanate (hereinafter abbreviated as MDI), toluene diisocyanate, 1, 4-diisocyanatobenzene, xylylene diisocyanate, and 2, 6-naphthalene diisocyanate are particularly suitable for synthesizing a polyurethane having high heat resistance and strength. Further, as the alicyclic diisocyanate, for example, methylene bis (cyclohexyl isocyanate), isophorone diisocyanate, methylcyclohexane 2, 4-diisocyanate, methylcyclohexane 2, 6-diisocyanate, cyclohexane 1, 4-diisocyanate, hexahydroxylylene diisocyanate, hexahydrotoluene diisocyanate, octahydro 1, 5-naphthalene diisocyanate and the like are preferable. The aliphatic diisocyanate can be effectively used particularly when yellowing of the polyurethane elastic yarn is suppressed. These diisocyanates may be used alone or in combination of 2 or more.

Next, at least 1 of the low-molecular-weight diamine and the low-molecular-weight diol is preferably used as the chain extender used in synthesizing the polyurethane. Among these, a chain extender having a hydroxyl group and an amino group in the molecule, such as ethanolamine, may be used.

Examples of the preferable low-molecular-weight diamine include ethylenediamine, 1, 2-propylenediamine, 1, 3-propylenediamine, hexamethylenediamine, p-phenylenediamine, p-xylylenediamine, m-xylylenediamine, p' -methylenedianiline, 1, 3-cyclohexyldiamine, hexahydro-m-phenylenediamine, 2-methylpentamethylenediamine, bis (4-aminophenyl) phosphine oxide, and the like. Among them, 1 or 2 or more species are preferably used. Ethylenediamine is particularly preferred. By using ethylenediamine, a yarn excellent in elongation, elastic recovery, and heat resistance can be easily obtained. A triamine compound capable of forming a crosslinked structure in these chain extenders, for example, diethylenetriamine or the like may be added to such an extent that the effect is not lost.

Further, as the low molecular weight diol, ethylene glycol, 1, 3-propanediol, 1, 4-butanediol, bishydroxyethoxybenzene, bishydroxyterephthalic acid ethylene glycol, 1-methyl-1, 2-ethanediol and the like are typical. Among them, 1 or 2 or more species are preferably used. Particularly preferred are ethylene glycol, 1, 3-propanediol, and 1, 4-butanediol. When these are used, the heat resistance of the polyurethane elongated as a diol is further improved, and a yarn having higher strength can be obtained.

In the present invention, the molecular weight of the polyurethane is preferably in the range of 30000 or more and 150000 or less in terms of the number average molecular weight, from the viewpoint of obtaining a fiber having high durability and strength. The molecular weight was measured by GPC and converted to polystyrene.

In the polyurethane, 1 or 2 or more kinds of the blocking agents are also preferably used in combination. The blocking agent is preferably a monoamine such as dimethylamine, diisopropylamine, ethylmethylamine, diethylamine, methylpropylamine, isopropylmethylamine, diisopropylamine, butylmethylamine, isobutylmethylamine, isopentylmethylamine, dibutylamine, or dipentylamine, a monoalcohol such as ethanol, propanol, butanol, isopropanol, allyl alcohol, or cyclopentanol, or a monoisocyanate such as phenyl isocyanate.

In the present invention, by containing the cationic high molecular weight compound a having a number average molecular weight of 2000 or more and the inorganic chlorine deterioration preventing agent B in the range of 0.5 to 10% by mass in the polyurethane elastic yarn composed of polyurethane having the above-described basic structure and making the mass ratio of a/B satisfy the range of 0.3 to 3, a large synergistic effect can be exhibited and an excellent chlorine deterioration resistance effect and water-repellent processability can be exhibited.

The cationic high molecular weight compound used in the present invention is not particularly limited as long as it is a compound having an amino group in the structure, and from the viewpoint of chlorine deterioration resistance and yellowing resistance of the polyurethane elastic yarn, a cationic high molecular weight compound having only a 3-stage (tertiary) amino group out of 1-stage (primary) to 3-stage (tertiary) amino groups in the molecule is particularly preferable.

When the number average molecular weight of the cationic high molecular weight compound is less than 2000, the cationic high molecular weight compound comes off due to friction with a yarn guide or a knitting needle at the time of knitting of the polyurethane elastic yarn, and flows out when processed in a bath such as dyeing, thereby deteriorating water-proof processability, and therefore the number average molecular weight needs to be 2000 or more. In view of solubility in the polyurethane spinning dope, the number average molecular weight is preferably in the range of 2000 to 10000. More preferably in the range of 2000 to 4000.

The water-repellent processability of the polyurethane elastic yarn can be improved by containing the cationic high molecular weight compound. From the viewpoint of achieving a sufficient effect and not adversely affecting the physical properties of the fiber, the cationic high molecular weight compound is contained in an amount of preferably more than 0.5% by mass and not more than 10% by mass, more preferably more than 0.5% by mass and not more than 4% by mass, based on the mass of the fiber.

In addition, the polyurethane yarn of the present invention needs to contain an inorganic chlorine deterioration inhibitor together with the cationic high molecular weight compound.

As the inorganic chlorine deterioration inhibitor in the present invention, at least one selected from oxides, carbonates, complex oxides and solid solutions of Zn, Mg, Ca and Al is preferably used. Particularly preferred is CaCO as a carbonate from the viewpoints of resistance to pool water and environmental impact₃、MgCO₃And hydrotalcite composed of Mg and Al.

The content of the inorganic chlorine deterioration inhibitor in the polyurethane elastic yarn in the present invention is preferably in the range of 0.5 mass% to 10 mass% from the viewpoints of the pool water resistance and the stability during production. More preferably 1% by mass or more and 5% by mass or less.

In addition, from the viewpoint of satisfying both the pool water resistance and the water repellency, the mass ratio (a)/(B) of the cationic high molecular weight compound (a) and the inorganic chlorine deterioration agent (B) in the polyurethane elastic yarn is in the range of 0.3 to 3, and more preferably in the range of 0.5 to 2.

Since the inorganic chlorine deterioration inhibitor is blended in the spinning solution to perform spinning, the inorganic chlorine deterioration inhibitor is preferably a fine powder having an average particle size of 2 μm or less, and more preferably a fine powder having an average particle size of 1 μm or less, from the viewpoint of spinning stability. From the viewpoint of dispersibility, when the average primary particle size is less than 0.01 μm, the cohesive force is increased, and uniform mixing in the spinning dope is difficult, so that the average primary particle size is preferably 0.01 μm or more. For the measurement of the average particle diameter, the 50% particle diameter was measured by a laser diffraction light scattering method. The measuring instrument is exemplified by a laser diffraction/scattering type particle distribution measuring instrument LA-950S2 manufactured by horiba, Ltd.

In order to finely pulverize the inorganic chlorine deterioration inhibitor, the following method is preferably used: an inorganic chlorine deterioration inhibitor is mixed with N, N-dimethylacetamide (hereinafter abbreviated as DMAc), dimethylformamide (hereinafter abbreviated as DMF), dimethyl sulfoxide (hereinafter abbreviated as DMSO), N-methylpyrrolidone (hereinafter abbreviated as NMP), or the like, or a solvent mainly containing these compounds, other additives, for example, a thickener, or the like to prepare a slurry, and the slurry is pulverized by a vertical or horizontal mill or the like.

For the purpose of improving the dispersibility of the inorganic chlorine deterioration inhibitor in the yarn and stabilizing the spun yarn, it is also preferable to use an inorganic chlorine deterioration inhibitor which is surface-treated with an organic substance such as a fatty acid, a fatty acid ester, a phosphate ester, a polyol organic substance, a silane coupling agent, a titanate coupling agent, water glass, a fatty acid metal salt, or a mixture thereof.

Further, the polyurethane elastic yarn of the present invention preferably contains a mono-hindered phenol compound from the viewpoint of improving the pool water resistance. The mono-hindered phenol compound is preferably a compound containing at least 2 mono-hindered hydroxyphenyl groups and having a skeleton selected from the group consisting of a diester and an alkylidene group. Here, the alkyl group present at a ring position adjacent to the hydroxyl group in the hydroxyphenyl group is more preferably a tert-butyl group, and the equivalent weight of the hydroxyl group is more preferably 600 or less.

The mono-hindered phenol compound is preferably ethylene-1, 2-bis (3, 3-bis [ 3-tert-butyl-4-hydroxyphenyl ] butyrate) (chemical formula 1 below) in which a mono-hindered hydroxyphenyl group is covalently bonded to a structure of a diester skeleton.

[ chemical formula No. 1]

The effect of chlorine deterioration resistance can be improved by containing the mono-hindered phenol compound. From the viewpoint of achieving sufficient effects and not adversely affecting the physical properties of the fibers, the mono-hindered phenol compound is contained in the polyurethane elastic yarn preferably in an amount of 0.15 to 4% by mass, more preferably in an amount of 0.5 to 3.5% by mass.

The treating agent for the polyurethane elastic yarn in the present invention is, for example, a silicone in a form of an oil agent, which is added to the elastic fiber in a specific range of 0.5 mass% to 20 mass%. This silicone originally is intended to suppress tension fluctuation at the time of unwinding of a polyurethane elastic yarn in the production of a fabric to a small extent, and even in the case of a fine-denier elastic fiber, it is desired to suppress yarn breakage or the like due to the unwinding tension fluctuation. The content of silicone in the treatment agent is preferably 0.5 to 10 mass%, and preferably 1 to 6 mass%, in terms of dry mass. This improves the affinity with the water repellent agent. For example, when the oil agent contains silicone, the surface energy of the fabric surface is reduced, and the diffusion performance of the water repellent agent is remarkably improved when the water repellent agent is spread on the fabric surface.

The silicone is preferably polydimethylsiloxane and/or modified polysiloxane composed of dimethylsiloxane units. The modified polysiloxane is preferably a polydialkylsiloxane comprising a dimethylsiloxane unit and a dialkylsiloxane unit containing an alkyl group having 2 to 4 carbon atoms, a silicone oil such as a polysiloxane comprising a dimethylsiloxane unit and a methylphenylsiloxane unit, or the like. From the viewpoint of handling and reducing running friction with the yarn guides, the viscosity at 25 ℃ is preferably 5X 10^-6～50×10^-6m²And s. The viscosity can be measured by the method specified in JIS-K2283 (crude oil and petroleum products-kinematic viscosity test method and viscosity index calculation method).

When used as a silicone oil, it is also preferable to use a mixture of a paraffin hydrocarbon such as mineral oil, an antistatic agent, a dispersant, a metal soap, and the like. As the paraffin hydrocarbon such as mineral oil, etc., from the viewpoint of operability and reductionFrom the viewpoint of low running friction with the yarn guides, the viscosity at 25 ℃ is preferably 5X 10^-6～50×10^-6m²And s. As the antistatic agent, anionic surfactants such as alkyl sulfate, fatty acid soap, alkyl sulfonate, and alkyl phosphate are preferably used. As the dispersant, silicone resin, polyether-modified silicone, carbinol-modified silicone, carboxyl-modified silicone, amino-modified silicone, amide-modified silicone, carboxyl amide-modified silicone, mercapto-modified silicone, organic carboxylic acid, or the like is preferably used alone or as a mixture. Magnesium stearate (hereinafter abbreviated as St-Mg) and calcium stearate are preferred as the metal soap, and the average particle diameter is preferably 0.1 to 1.0 μm from the viewpoint of improving workability and dispersibility.

The silicone oil used in the present invention preferably further contains components generally used as synthetic fiber treatment agents, such as a linking agent, an ultraviolet absorber, an antioxidant, a preservative, and a wettability enhancer, as necessary. The content of the paraffin hydrocarbon such as the mineral oil, the metal soap, the antistatic agent, the dispersant and the like is preferably determined as appropriate depending on the purpose.

Further, it is preferable to add a stabilizer, a thermal conductivity improver, and a pigment to the extent that the effects of the present invention are not impaired.

The polyurethane elastic yarn of the present invention may contain various stabilizers, pigments, and the like as needed. Examples of the light-resistant agent and the antioxidant include a compound obtained by adding a hindered phenol-based agent represented by BHT or "SUMILIZER" (registered trademark) GA-80 manufactured by Sumitomo chemical industries, a benzotriazole-based agent such as "Tinuvin" (registered trademark) manufactured by Ciba-Geigy, a benzophenone-based agent, a phosphorus-based agent such as "SUMILIZER" P-16 manufactured by Sumitomo chemical industries, various hindered amine-based agents, an inorganic pigment such as titanium oxide or carbon black, a fluorine-based resin powder or a silicone-based resin powder based on polyvinylidene fluoride, and a metal soap such as magnesium stearate, and a bactericide containing silver, zinc, or a compound thereof, a deodorant, a lubricant such as silicone or mineral oil, various antistatic agents such as barium sulfate, cerium oxide, betaine, a phosphoric acid compound, and a phosphate compound, and the like, and is present by reacting with the polymer. Further, in order to further improve durability against light, various nitrogen oxides, and the like, in particular, it is preferable to contain a nitrogen oxide capturing agent such as HN-150 manufactured by Hydrazine corporation, Hostanox (registered trademark) SE10 manufactured by Clariant Co corporation, a thermal oxidation stabilizer such as SUMILIZER GA-80 manufactured by Sumitomo chemical industries, and a light stabilizer such as Sumisorb (registered trademark) 300#622 manufactured by Sumitomo chemical industries, and the like.

Next, a method for producing the polyurethane elastic yarn of the present invention will be described in detail.

First, the polyurethane may be produced by either melt polymerization or solution polymerization, or by other methods. However, the solution polymerization method is more preferable. In the case of the solution polymerization method, the generation of foreign matters such as gel in polyurethane is small, spinning is easy, and a polyurethane elastic yarn with a low fineness is easily obtained. In addition, it is needless to say that in the case of solution polymerization, there is an advantage that the operation of preparing a solution is omitted.

Further, as a polyurethane particularly preferable in the present invention, there can be mentioned a polyurethane synthesized by using PTMG having a molecular weight of 1500 or more and 6000 or less as a polymer diol, MDI as a diisocyanate, and at least 1 of ethylenediamine, 1, 2-propylenediamine, 1, 3-propylenediamine, and hexamethylenediamine as a diisocyanate.

The polyurethane can be synthesized, for example, by using the above-mentioned raw materials in DMAc, DMF, DMSO, NMP, or the like, or a solvent containing these as the main component. For example, the following methods can be adopted as particularly preferable methods: the method of producing a polyurethane by adding and dissolving the raw materials in such a solvent and heating the mixture to an appropriate temperature to cause the reaction, the so-called one-shot method, and the method of producing a polyurethane by first melt-reacting a polymer diol and a diisocyanate, and then dissolving the reaction product in a solvent and reacting the reaction product with the aforementioned chain extender.

When a diol is used as the chain extender, the melting point of the polyurethane on the high temperature side is preferably adjusted to a range of 200 ℃ to 260 ℃ from the viewpoint of obtaining a polyurethane excellent in heat resistance. Representative processes can be achieved by controlling the type and ratio of polymeric diols, MDI, diols. When the molecular weight of the polymer diol is low, a polyurethane having a high melting point at high temperature can be obtained by relatively increasing the proportion of MDI, and similarly, when the molecular weight of the diol is low, a polyurethane having a high melting point at high temperature can be obtained by relatively decreasing the proportion of the polymer diol.

When the molecular weight of the polymer diol is 1800 or more, it is preferable to polymerize the polymer diol in a ratio of (the number of moles of MDI)/(the number of moles of the polymer diol) of 1.5 or more so that the melting point at the high temperature side is 200 ℃ or more.

In the synthesis of the polyurethane, it is also preferable to use 1 or 2 or more kinds of catalysts such as amine-based catalysts and organometallic catalysts in combination.

Examples of the amine-based catalyst include N, N-dimethylcyclohexylamine, N, N-dimethylbenzylamine, triethylamine, N-methylmorpholine, N-ethylmorpholine, N, N, N ', N' -tetramethylethylenediamine, N, N, N ', N' -tetramethyl-1, 3-propanediamine, N, N, N ', N' -tetramethylhexamethylenediamine, bis-2-dimethylaminoethylether, N, N, N ', N', N '-pentamethyldiethylenetriamine, tetramethylguanidine, triethylenediamine, N, N' -dimethylpiperazine, N-methyl-N '-dimethylaminoethyl-piperazine, N- (2-dimethylaminoethyl) morpholine, 1-methylimidazole, 1, 2-dimethylimidazole, N, N' -dimethylimidazole, N-dimethylmorpholine, N, N '-dimethylethylenediamine, N-dimethylhexamethylenediamine, N, N, N' -dimethylhexamethylenediamine, N-2-dimethylaminoethyl-piperazine, N- (2-dimethylaminoethyl) morpholine, 1-methylimidazole, 1, 2-dimethylimidazole, N, N-dimethylimidazole, N-dimethylethylenediamine, N-1, N-dimethylethylenediamine, N-2-dimethylethylenediamine, N-dimethylethylenediamine, and N-dimethylethylenediamine, N, N-dimethylaminoethanol, N, N, N '-trimethylaminoethylethanolamine, N-methyl-N' - (2-hydroxyethyl) piperazine, 2,4, 6-tris (dimethylaminomethyl) phenol, N, N-dimethylaminohexanol, triethanolamine and the like.

Examples of the organometallic catalyst include tin octylate, dibutyltin laurate, lead dibutyl octylate, and the like.

The concentration of the polyurethane in the polyurethane solution obtained in this way is preferably in the range of usually 30 mass% to 80 mass%.

In the present invention, the polyurethane solution contains a cationic high molecular weight compound having a number average molecular weight of 2000 or more and an inorganic chlorine deterioration preventing agent in order to improve durability against chlorine in pond water and improve water repellency. The cationic high-molecular weight compound may be contained in the dope by itself or by mixing with an inorganic chlorine deterioration inhibitor. As a method for dispersing the polyurethane spinning dope before spinning without a patch, it is preferable to add the cationic high molecular weight compound and the inorganic chlorine deterioration inhibitor to the polyurethane spinning dope using N, N-dimethylformamide, N-dimethylacetamide, or the like as a solvent, and stir and mix the mixture to uniformly disperse the mixture. Specifically, it is preferable to dissolve or disperse the cationic high molecular weight compound and the inorganic chlorine deterioration inhibitor in a solvent such as N, N-dimethylformamide or N, N-dimethylacetamide in advance, and mix the solution and the dispersion into the polyurethane spinning dope. Here, from the viewpoint of uniform addition to the polyurethane solution, the same solvent as the polyurethane solution is preferably used as the solvent for the cationic high molecular weight compound and the inorganic chlorine deterioration inhibitor to be added. Further, a cationic high molecular weight compound and an inorganic chlorine deterioration inhibitor, the above-mentioned chemicals such as a light resistance agent and an antioxidant, and a pigment may be added at the same time. In this case, any method may be employed as a method of adding the cationic high molecular weight compound and the inorganic chlorine deterioration inhibitor to the polyurethane solution. As a representative method thereof, various methods such as a method using a static mixer, a method using stirring, a method using a homomixer, a method using a twin screw extruder, and the like can be employed.

In order to improve durability against chlorine in pool water, it is preferable that the polyurethane elastic yarn contains a mono-hindered phenol compound having a molecular weight of 300 or more, which has at least 1 mono-hindered hydroxyphenyl group, in a range of 0.15 to 4.0 mass%, for example. The method for incorporating the mono-hindered phenol compound into the dope may be any method, and may be used by mixing the mono-hindered phenol compound with the dope alone or by mixing the mono-hindered phenol compound with the dope in advance in the solution or dispersion.

The polyurethane yarn of the present invention can be obtained by, for example, dry spinning, wet spinning, or melt spinning the dope thus formed and winding the dope. Among them, dry spinning is preferable in terms of stable spinning for all fineness from fine to coarse.

The fineness, the cross-sectional shape, and the like of the elastic polyurethane yarn of the present invention are not particularly limited. For example, the cross-sectional shape of the wire may be circular or flat.

The dry spinning method is not particularly limited, and spinning can be performed by appropriately selecting desired characteristics, spinning conditions suitable for spinning equipment, and the like.

In addition, the spinning speed is preferably 250 m/min or more from the viewpoint of improving the strength of the resulting polyurethane elastic yarn.

The knitted fabric including the polyurethane elastic yarn may be any one of circular knitting, weft knitting, and warp knitting (including crochet knitting and raschel knitting), and the knitting may be any one of a loop knitting, plain knitting (plain knitting), plain stitch (plain stitch), rib knitting (rib knitting), interlock knitting (double knitting), rib knitting (rib stitch), purl knitting (purl knitting), warp flat knitting (denigh knitting), double warp flat knitting, cord knitting, half knitting, satin, warp knitting, double warp knitting, chain knitting, and interlining knitting, and a knitted fabric formed by combining these knitting structures.

A fabric composed of polyurethane elastic yarns and other fibers is woven by a usual method. The weave includes plain weave, twill weave, satin weave, modified plain weave, modified twill weave, modified satin weave, fancy weave, jacquard weave, single layer weave, double layer weave, multiple weave, warp pile weave, weft pile weave, leno weave (gauze weave), and a combination thereof. The fabric may be a one way stitch (one way stitch) in which polyurethane filaments are used only for warp filaments or weft filaments, or a two way stitch in which polyurethane filaments are used for both warp and weft filaments.

A fabric made of polyurethane elastic yarn and other fibers is refined, relaxed, and set under normal conditions. The dyeing of the fabric is usually performed under a condition of a dye suitable for other fibers having a high mixing ratio in the fabric. The dye may be a known dye other than a disperse dye, an acid dye and a gold-containing dye, and may be subjected to fixing treatment for fixing the dye, antibacterial treatment, softening treatment and the like as required.

Next, the waterproofing method of the present invention will be explained. The waterproofing treatment method of the present invention is preferably carried out by dry heat treatment. The dry heat treatment may be a method of applying a treatment liquid containing a water repellent to the swimwear using a device such as a mangle, and then drying and heat-treating the swimwear. The device for applying the treatment liquid containing the water repellent to the swimwear may be a device capable of uniformly applying the liquid to the swimwear, and it is preferable to use a general padding machine as the liquid applying device. The coating may be applied by a foam processing machine, a printing method, an ink jet method, a spray coating method, a coating method, or the like. The drying temperature is preferably 80 ℃ to 150 ℃. The treatment time is preferably 15 seconds to 5 minutes, more preferably 30 seconds to 3 minutes at 100 to 140 ℃. The heat treatment temperature after drying is preferably 80-200 ℃. The treatment time is preferably 15 seconds to 8 minutes, and more preferably 30 seconds to 5 minutes at 130 to 190 ℃. When the treatment temperature is low, the reaction is insufficient and the water repellency is lowered.

Hereinafter, the description will be given with reference to the drawings. In the following drawings, the same symbol denotes the same object. Fig. 1 is a schematic plan view of a stretch fabric 1 in which plain weave portions 2 and double weft weave portions 3 are alternately repeated according to an embodiment of the present invention. The warp yarns 4 and the weft yarns 5 of the plain weave portion 2 are crossed to constitute a woven fabric. The warp yarn 4 of the double weft portion 3 crosses the weft yarns 6a, 6b to form a woven fabric, and the weft yarn 6a is arranged on the front side and the weft yarn 6b is arranged on the back side, so that the thickness of the double weft portion 3 is larger than that of the plain portion 2. Further, the double-weft knitted fabric portion 3 is reinforced by arranging more elastic yarns than the plain portion 2, and therefore, the stretch property is improved and the wearing is facilitated. Further, since the plain weave portion 2 is a concave portion and the double-weft weave portion 3 is a convex portion, the uneven portions are arranged in one direction as a whole to form a stripe shape. Therefore, for example, in the case of forming a swimsuit, if the stripe shape is used at a position along the height direction of the body, the surface frictional resistance with the water flow can be reduced.

Fig. 2 is a schematic plan view of a stretch fabric 7 in which plain weave portions 8 and double warp weave portions 9 are alternately repeated according to another embodiment of the present invention. The warp yarns 10 of the plain portion 8 cross the weft yarns 11 to form a woven fabric. The

warp yarns

12a and 12b of the double-warp knitted fabric portion 9 are crossed with the weft yarns 11 to form a woven fabric, and since the warp yarn 12a is arranged in the front and the warp yarn 12b is arranged in the back, the thickness of the double-warp knitted fabric portion 9 is larger than that of the plain portion 8.

Fig. 3A is a schematic top view and fig. 3B is a sectional view of an elastic fabric 1 according to an embodiment of the present invention. The plain weave portion 2 is a concave portion, the double-weft weave portion 3 is a convex portion, and the concave and convex portions are arranged in one direction and are in a stripe shape when viewed in a plan view.

Fig. 4 is a schematic plan view of a single covered wire 13 used in the stretch fabric, in which a core wire 14 is made of an elastic wire such as polyurethane, and 1 covered wire 15 is made of a processed wire such as nylon. Fig. 4B is a schematic plan view of a double covered wire 16 according to another embodiment, in which a core wire 17 is made of an elastic wire such as polyurethane, and a covered wire (upper wire) 19 and a covered wire (lower wire) 18 are made of a processed wire such as nylon.

Fig. 5 is a schematic front view of swimming suit 20 using the stretch fabric, and fig. 6 is a rear view thereof. The striped portion 21 of the front of the swimming suit 20 from the abdomen to the top is a fabric in which the plain portion and the double-woven portion shown in fig. 1 and 3 are alternately repeated. The planar portion 22 of the belt portion from the thigh to the side of the waist and from the shoulder to the back of the front of the swimming match swimsuit 20 is a plain weave. The strip portion 21 and the plane portion 22 are sewn. The entire back of the swimming suit 20 is a striped portion 21 (a fabric in which plain portions and double portions are alternately repeated). The bar portion 21 is preferably arranged in the height direction of the human body.

Fig. 7 is a schematic front view of a swimsuit 23 for male use, which uses the stretch fabric. The stripe portion 24 is a weave in which plain weave portions and double weave portions are alternately repeated. The flat portion 25 is a plain weave fabric. The stripe portion 24 is preferably arranged in the height direction of the human body.

Swimwear for swimming competitions is preferably made with a figure that is about 20% to 40% smaller than the human body. Thus, the garment can be tightly worn on the human body.

Examples

The present invention will be described in further detail with reference to examples. The present invention is not to be construed as being limited to the following examples. In the following examples, the weight ratio is expressed as% by mass.

Hereinafter, various characteristics of the fabric were measured by the following methods.

< mass concentration of element >

SEM-EDX was measured under the following conditions using polyurethane elastic yarns produced by decomposing the swimsuit to appear on the surface, or polyurethane elastic fibers obtained by defibrating the swimsuit. And calculating the F/C ratio according to the obtained mass concentration of the elements. As a measuring apparatus, SEM (S-3400N, manufactured by Hitachi Co.) and EDX detector (EMAX-act, manufactured by Horiba Co.) were used.

(measurement conditions)

Acceleration voltage: 5kV

Resolution ratio: 1024 × 768

Probe current: 50mA

Real-time: 120sec

Vacuum degree: 30Pa

The process time is as follows: mode: 4

WD：10mm

Spectral range: 0-20keV

Multiplying power: 2000 times of

The number of channels: 2K

< Water resistance >

The evaluation was carried out by the spray method in accordance with the method specified in JIS L1092 "method for testing water repellency of fiber products" (1998), and the evaluation was carried out by classification.

< Water-Retention >

A circle 11.2cm in diameter was drawn at the center of a swimsuit cut 20cm in length and 20cm in width, the circle was stretched by expanding the area by 80%, the swimsuit was attached to a test piece holding frame used in the waterproofness test (JIS L1092), subjected to a spray test (JIS L1092), removed from the holding frame, and air-dried in an atmosphere of 20 ° c. × 53% RH. 10 pieces of the swimwear were prepared, and the value obtained by measuring the weight of each 1 piece was defined as "weight before treatment".

The water retention was measured by adding 30L of water (water temperature: 25 to 29 ℃) to a washing machine (JIS C9606), putting 10 pieces of the swimsuit into water, rotating the swimsuit under "strong conditions" for a predetermined time (10 minutes, 60 minutes, 120 minutes), taking out each piece from the water, inclining the piece at about 15 degrees in a spread state, waiting for 10 seconds, dropping water droplets attached to the swimsuit, measuring the weight, and taking the obtained value as "weight after treatment" by the following formula.

Water retention (%) ((weight after treatment-weight before treatment)/weight before treatment) × 100

< buoyancy test >

First, the weight of the sample was measured in the air (W1). Next, the weight in water was measured by the buoyancy measurement method shown in fig. 8 (W2). In this buoyancy test device 30, water 32 is added to a container 31, a sample 38 is added thereto, and a test device 33 is fixed thereto. The test apparatus holds a weight between the support 34 and the plate 36, mounts the support bar 35 and the wire mesh 37, and as shown in fig. 8, puts the wire mesh 37 in water, and measures the weight of the sample 38 in water (W2). The buoyancy was calculated from W1-W2. In the case of a cloth sample, 5 samples each having a length of 3cm and a width of 4cm were measured to obtain an average value. The weight of the cloth sample was measured when it was dried.

< tear Strength >

The evaluation was carried out by a pendulum method defined in JIS L1096 "method for testing woven and knitted fabrics" (1999).

< breaking Strength >

The evaluation was carried out by the Mueller method defined in JIS L1096 "method for testing woven and knitted fabrics" (1999).

< elongation >

In accordance with method a defined in JIS L1096 "test method for fabric and knitted fabric" (1999): the measurement was performed by the cut-line method. The width of the test piece was 5cm, and the jig interval was 20 cm. The initial load is a load corresponding to a gravity applied to a length of 1m in terms of the width of the test piece. The drawing speed was set to 20 cm/min. The elongation (%) under a load of 17.7N (1.8kg) was measured. The elongation rate indicates the stretchability.

Stress at elongation < 30%

The stress (N) at 30% elongation at elongation in the warp and weft directions was measured and expressed in terms of N/cm per 1 cm. The stress at 30% elongation is a standard for evaluating the compression (dressing pressure) function.

(preparation of polyurethane elastic yarn A yarn)

PTMG having a number average molecular weight of 1800 and MDI were put into a vessel so that the molar ratio MDI/PTMG became 1.58/1, and reacted at 90 ℃, and the obtained reaction product was dissolved in N, N-dimethylacetamide (DMAc). Next, a DMAc solution containing ethylenediamine and diethylamine was added to the solution in which the reactants were dissolved, to prepare a polyurethaneurea solution in which the solid component in the polymer was 35 mass%.

A DMAc solution (concentration of 35 mass%) was prepared by mixing a polycondensate of p-cresol and divinylbenzene ("Methacrol" (registered trademark) 2390, manufactured by DuPont) as an antioxidant and 2- [4, 6-bis (2, 4-dimethylphenyl) -1,3, 5-triazin-2-yl ] -5- (octyloxy) phenol ("Cyasorb" (registered trademark) 1164, manufactured by Cytec) as an ultraviolet absorber in a ratio of 3 to 2 (mass%) to prepare a DMAc solution (concentration of 35 mass%), which was used as an additive solution (35 mass%).

The polyurethaneurea solution and the additive solution were mixed at a ratio of 98 mass% to 2 mass% to prepare a polymer solution (X1).

As the cationic high molecular weight compound, a cationic high molecular weight compound having a number average molecular weight of 2600 was produced by the reaction of t-butyldiethanolamine with methylene-bis- (4-cyclohexyl isocyanate). The produced cationic high-molecular weight compound was dissolved in DMAc to prepare a solution (a1) having a concentration of 35 mass%.

Calcium carbonate Baiyanhua A (CaCO) manufactured by Baishi Industrial Co Ltd₃Average primary particle diameter: 1.0 μm) was used as a chlorine deterioration preventing agent to prepare a 35 mass% DMAc dispersion. In the preparation, DYNO-MIL KDL manufactured by WILLY A. BACHOFEN company, filled with 85% zirconia beads, at a flow rate of 80 g/minThe resulting mixture was uniformly microdispersed under the conditions to obtain a DMAc dispersion B1(35 mass%) of a synthetic carbonate.

Further, as the mono-hindered phenol compound, ethylene-1, 2-bis (3, 3-bis [ 3-tert-butyl-4-hydroxyphenyl ] butyrate (manufactured by Clariant Corporation, "Hostanox" (registered trademark) O3) was dissolved in DM Ac to prepare a solution (C1) having a concentration of 35 mass%.

The polymer solutions X1, a1, B1, and C1 were mixed at a ratio of 97 mass%, 1 mass%, 3 mass%, and 1 mass%, respectively, to prepare a spinning dope Y1. This spinning dope Y1 was dry-spun at a take-up speed of 580 m/min to produce a polyurethane elastic yarn (78dtex) (Z1), and a silicone oil agent as a treatment agent was applied and taken up. The silicone oil agent was a treatment agent (oil agent) having 6% of silicone (polydimethylsiloxane), 3% of St-Mg, and 1% of a dispersant, based on the dry weight.

The polyurethane elastic yarn obtained as described above was single-coated with nylon 66 raw yarn. The nylon 66 raw silk is 33dtex and 10 silk. Thus, filament A was obtained.

(preparation of polyurethane elastic yarn B)

Yarn B was obtained in the same manner as yarn a except that elastic polyurethane yarn was prepared at 55 dtex.

(preparation of polyurethane elastic yarn C)

Yarn C was produced in the same manner as yarn a except that 44dtex elastic polyurethane yarn was used and the yarn was covered with 33dtex, 10 yarn raw nylon 66 yarn.

(preparation of polyurethane elastic yarn D)

Yarn D was produced in the same manner as yarn a except that 44dtex elastic polyurethane yarn was used and the yarn was covered with 22dtex, 24-yarn raw nylon 66 yarn.

(preparation of polyurethane elastic yarn E)

Yarn E was produced in the same manner as yarn a except that 33dtex elastic polyurethane yarn was used and the yarn was covered with 22dtex, 24-yarn raw nylon 66 yarn.

(preparation of polyurethane elastic yarn F)

78dtex polyurethane elastic fiber (manufactured by TORAY OPENTEX, Inc., model: 176E) was covered with 33dtex, 10-filament nylon 66 raw yarn to obtain a yarn F.

(preparation of polyurethane elastic yarn G)

A55 dtex polyurethane elastic fiber (model: 254E, manufactured by TORAY OPENTEX CO., LTD.) was covered with a 33dtex, 10-filament nylon 66 raw yarn to obtain a yarn G.

(preparation of polyurethane elastic yarn H)

44dtex polyurethane elastic fiber (model: 254T manufactured by TORAY OPENTEX corporation) was covered with 33dtex 10-filament nylon 66 raw yarn to obtain a yarn H.

(preparation of polyurethane elastic yarn I)

44dtex polyurethane elastic fiber (model: 254T manufactured by TORAY OPENTEX corporation) was covered with 22dtex 24-filament nylon 66 raw yarn to obtain yarn I.

(preparation of polyurethane elastic yarn J)

A33 dtex polyurethane elastic fiber (model: 254E, manufactured by TORAY OPENTEX CO., LTD.) was covered with 22dtex, 24-filament nylon 66 raw yarn to obtain yarn J.

(example 1)

An elastic fabric 1 in which a plain weave portion 2 and a double-weft weave portion 3 shown in fig. 1 are alternately repeated is woven by using a warp yarn a, a weft yarn B, and a weft yarn C. The nylon content of the obtained fabric was 66 mass% and the polyurethane content was 34 mass%. The fabric is refined, fixed in the middle, dyed and dried according to the conventional method. The resulting fabric was immersed in the following waterproof formulation, wrung out at 50% with a picker, and then dried in a pin tenter set to a temperature of 130 ℃. Subsequently, dry heat treatment was performed for 1 minute in a pin tenter set to a temperature of 170 ℃, to obtain a processed cloth fabric of example 1. The obtained processed cloth exhibits high water repellency, and a fabric cloth exhibiting low water retention and excellent water repellency is obtained.

FX-ML (Kyoto seriation chemical Synthesis fluorine-producing Water repellent, Kabushiki Kaisha): 100g/L

BECKAMINE M-3 (a melamine resin manufactured by Dainippon ink chemical Co., Ltd.): 3g/L

BECKAMINE ACX (catalyst from japan ink chemical industries co., ltd.): 2g/L

SUPER FRESH JB 7200 (manufactured by JAK FABRICATION CO., LTD.): 5g/L

And performing smoothing processing on the surface of the fabric. The smoothing is performed by heating and pressing between a pair of rolls, the roll temperature is set to 220 ℃, the linear pressure is set to 5500kgf, and the roll speed is set to about 6 to 10 m/min.

The density of warp threads of the fabric obtained was 186 threads/2.54 cm, and the density of weft threads of the plain weave portion: 179 pieces/2.54 cm, weft density of double weft knitted portion: 209 roots/2.54 cm, a mass per unit area of 142g/m²The plain weave portion 2 was 1.70mm in width, and the double-weft weave portion 3 was 1.70mm in width.

The elongation of the fabric was 52.9% in the warp direction and 35.2% in the weft direction, and the stress at 30% elongation was 1.72N/cm in the warp direction and 2.96N/cm in the weft direction. The obtained processed cloth has high elasticity, good adhesion to human skin, high water resistance, low water retention rate, and excellent water resistance.

(example 2)

The warp yarn uses the yarn D, and the weft yarn uses the yarn E, so that plain weave fabrics are manufactured. A woven fabric comprising 70% of nylon and 30% of polyurethane was dyed and waterproofed in the same manner as in example 1 to give a fabric having a warp density of 205 pieces/2.54 cm, a weft density of 200 pieces/2.54 cm and a mass per unit area of 95g/m²The fabric of (1). The obtained processed cloth is high in stretchability, good in close contact with human skin, high in water repellency, low in water retention, and excellent in water repellency. The results are summarized in Table 1.

Comparative example 1

A processed cloth fabric of comparative example 1 was obtained by performing dyeing, water repellent treatment, and surface smoothing treatment in the same manner as in example 1, except that a fabric having 66% nylon and 34% polyurethane was woven by using the warp yarn F, the weft-side yarn G, and the weft-side yarn H.

The density of warp threads of the fabric obtained was 184 threads/2.54 cm, and the density of weft threads of the plain weave portion: 178 pieces/2.54 cm, weft density of double weft knitted portion: 208 per 2.54cm, with a mass per unit area of 139g/m²The plain weave portion 2 was 1.70mm in width, and the double-weft weave portion 3 was 1.70mm in width.

The obtained processed cloth exhibits high water repellency and a high water retention rate, and is insufficient. The above results are shown in table 1.

Comparative example 2

A processed cloth fabric of comparative example 2 was obtained by performing dyeing and water repellent processing in the same manner as in example 2, except that a fabric having 70% nylon and 30% polyurethane was woven by using the warp yarn I and the weft yarn J.

The density of the warp yarns of the fabric manufactured is 215 yarns/2.54 cm, and the density of the weft yarns is as follows: 210 pieces/2.54 cm, and a mass per unit area of 116g/m²The fabric of (1). The obtained processed cloth exhibits high water repellency and a high water retention rate, and is insufficient. The above results are shown in table 1.

TABLE 1

Tear Strength with fracture residue

As shown in table 1, it was confirmed that the swimwear fabrics of examples 1 and 2 have high water repellency and low water retention rate, and high buoyancy.

(example 3)

The male swimsuit for swimming match shown in fig. 7 was sewn using the fabric cloth of example 1 and the fabric cloth of example 2. The fabric cloth of example 1 is a fabric in which plain weave portions and double-weft weave portions are alternately repeated in the stripe portion 24, and the stripe portion 24 is arranged in the height direction of the human body. The plain weave fabric cloth of example 2 is the flat portion 25.

Comparative example 3

The male swimsuit for swimming match shown in fig. 7 was sewn using the fabric cloth of comparative example 1 and the fabric cloth of comparative example 2 of plain weave.

The above results are shown in table 2.

TABLE 2

As shown in table 2, it was confirmed that the swimwear of example 3 had high buoyancy.

Industrial applicability

The swimsuit comprising the polyurethane elastic yarn of the present invention has high water resistance, low water retention rate, high buoyancy, and thus is suitable for use by swimmers and swimmers in swimming competitions.

Description of the symbols

1.7 stretch fabric

2. 8 plain weave portion

3 double weft knitting part

4. 10, 12a, 12b warp filaments

5. 6a, 6b, 11 weft

9 double warp knitted part

13 Single core-spun yarn

14. 17 core wire

15. 18, 19 covered yarn

16 double-core-wrapping silk

Swimsuit for 20 women

21. 24 stripe-shaped part

22. 25 plane part

23 swimsuit for men

30 buoyancy test device

31 container

32 water

33 weight meter

34 support body

35 support rod

36 board

37 Metal net

38 test specimen

Claims

1. A swimming suit, which is characterized in that the swimming suit comprises polyurethane elastic yarns, wherein,

the polyurethane elastic yarn contains a cationic high molecular weight compound A with a number average molecular weight of more than 2000 and an inorganic chlorine deterioration preventing agent B in a range of 0.5-10 mass%, the mass ratio of the cationic high molecular weight compound A/the inorganic chlorine deterioration preventing agent B satisfies a range of 0.3-3, and the polyurethane elastic yarn is provided with a silicone oil agent,

the swimsuit fabric is subjected to waterproof processing.

2. A swimming garment according to claim 1,

the swimsuit has a fluorine (F)/carbon (C) ratio of 0.030 or more in the element mass concentration of scanning electron microscope-energy dispersive X-ray spectrometry (SEM-EDX) on the polyurethane elastic yarn.

3. A swimming garment according to claim 1 or 2,

the swimsuit comprises 5-70 mass% of polyurethane elastic yarns.

4. A swimming garment according to any one of claims 1 to 3,

the water repellency of the swimsuit fabric is not less than 4 in a spray test specified in JIS L1092.

5. A swimming garment according to any one of claims 1 to 4,

the water retention rate of the swimsuit fabric after 60 minutes is 50 mass% or less of the swimsuit quality.

6. A swimming garment according to any one of claims 1 to 5,

the polyurethane elastic yarn is coated by other synthetic fiber yarns.

7. A swimming garment according to any one of claims 1 to 6,

the swimsuit fabric comprises polyamide fiber or polyester fiber.

8. A swimming garment according to any one of claims 1 to 7,

the tearing strength of the swimsuit fabric is more than 8N specified in JIS L1096.

9. A swimming garment according to any one of claims 1 to 8,

the swimsuit fabric has a breaking strength of 200kPa or more as defined in JIS L1096.

10. A swimming garment according to any one of claims 1 to 9,

the swimsuit cloth is at least one selected from a fabric and a woven fabric.

11. A swimming garment according to any one of claims 1 to 10,

the buoyancy of each 1g of the swimsuit fabric is more than 1.70 g.

12. A swimming garment according to any one of claims 1 to 11,

the buoyancy of each 1g of the swimming suit is more than 1.45 g.