JP2006274489A - Moisture-permeable waterproof fabric and method for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a moisture-permeable waterproof fabric having high moisture permeability and waterproof performance and an excellent feeling and fastness to washing. <P>SOLUTION: The moisture-permeable waterproof fabric has a resin layer that is composed of a synthetic polymer consisting essentially of a polyurethane resin, has 10-40 μm thickness and a substantially monolayer structure on one side of a fiber fabric, is provided with a large number of micropores formed in the resin layer and has a water vapor transmission rate of 7,000-12,000 g/m<SP>2</SP>24 hours and a water pressure resistance of 120-300 kPa. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a moisture-permeable and waterproof fabric and a method for producing the fabric.

  The moisture-permeable and waterproof fabric having both moisture permeability and waterproofness has a function of releasing water vapor from sweating from the body to the outside of the clothes and a function of preventing rainwater from entering the clothes. Such a moisture-permeable and waterproof fabric is used as a material for sports clothing, cold clothing, and the like, and among them, it is suitably used as a clothing material for sports and outdoors that have a relatively large amount of perspiration due to exercise.

As an example of the moisture permeable waterproof fabric, Patent Document 1 has a porous resin layer made of a synthetic polymer mainly composed of polyurethane resin on a fiber fabric, and the resin layer is substantially nonporous. A coating fabric containing 11% inorganic fine powder having an average particle size of 0.1 μm or less, having a moisture permeability of 9030 g / m ² · 24 hrs and a water pressure resistance of 1.12 kg / cm ² is disclosed.

In general, a resin layer made of a synthetic polymer mainly composed of a polyurethane resin has a two-layer structure of an inner layer portion called a honeycomb layer and an outer layer portion called a skin layer as a honeycomb skin core structure. Strictly speaking, fine pores exist in the skin layer, but since the diameter is as small as 1.00 μm or less, the skin layer is substantially a nonporous layer. On the other hand, the honeycomb layer has hollow holes in which holes having a diameter of 5.00 to 50.00 μm are formed so as to communicate with each other. In such a resin layer, the honeycomb layer mainly contributes to the moisture permeability of the moisture permeable waterproof fabric, and the skin layer mainly contributes to the waterproof performance.
Japanese Patent Laid-Open No. 5-222777 (Example 1)

  In the coating fabric as described above, in order to improve the waterproof performance, it is preferable to increase the thickness of the entire resin layer. However, in this case, not only the moisture permeability performance is lowered due to moisture permeability resistance, but also the texture is impaired. There is. On the other hand, in order to improve the moisture permeability, it is preferable to reduce the thickness of the entire resin layer, but there is a problem that the waterproof performance is lowered.

  Furthermore, in the above-mentioned coating fabric having the honeycomb skin core structure, when washing is repeatedly performed, the detergent gradually remains in the honeycomb layer, and the resin layer gradually becomes hydrophilic, resulting in a decrease in waterproof performance. .

  The present invention has been made in view of such a current situation, and it is technically to provide a moisture permeable and waterproof fabric having high moisture permeability and waterproof performance and excellent in texture and washing durability. It is to be an issue.

The present invention achieves the above-mentioned object and has the following configuration.
(1) It has a resin layer of a substantially single layer structure with a thickness of 10 to 40 μm made of a synthetic polymer mainly composed of polyurethane resin on one side of the fiber fabric, and a large number of micropores are formed in the resin layer. A moisture-permeable and waterproof fabric characterized by having a moisture permeability of 7000 to 12000 g / m ² · 24 hrs and a water pressure resistance of 120 to 300 kPa.
(2) A polyurethane resin mainly comprising an inorganic fine powder having an average particle size of 0.100 μm or less and an adsorption amount of N, N-dimethylformamide of 300 mL / 100 g or more in the total solid content. A synthetic polymer solution is applied to one side of a fiber cloth, then immersed in an aqueous solution of N, N-dimethylformamide having a concentration of 10 to 70%, and then washed with hot water and dried to produce a moisture-permeable and waterproof fabric. Method.

  The moisture-permeable and waterproof fabric of the present invention has high moisture permeability and waterproof performance, and is excellent in texture and washing durability. Therefore, the moisture-permeable waterproof fabric of the present invention can be widely used not only for sports clothing but also in the general leisure field.

  Further, according to the method for producing a moisture-permeable and waterproof fabric of the present invention, a resin layer having a substantially single layer structure having a large number of micropores can be easily formed. It is possible to easily produce a moisture-permeable and waterproof fabric.

  Hereinafter, the present invention will be described in detail.

  Examples of the fiber fabric used for the moisture-permeable and waterproof fabric of the present invention include, for example, polyamide-based synthetic fibers represented by nylon 6 and nylon 66, polyester-based synthetic fibers represented by polyethylene terephthalate, polyacrylonitrile-based synthetic fibers, Examples include synthetic fibers such as polyvinyl alcohol-based synthetic fibers, semi-synthetic fibers such as triacetate, and woven fabrics, knitted fabrics, and non-woven fabrics made of mixed fibers such as nylon 6 / cotton and polyethylene terephthalate / cotton.

  In selecting the fiber fabric, the moisture permeability and waterproof performance of the moisture-permeable and waterproof fabric finally obtained may be considered. For example, when it is desired to further improve the moisture permeability, a fiber fabric made of hydrophilic fibers such as polyamide synthetic fibers may be used. On the other hand, when it is desired to further improve the waterproof performance, a fiber fabric made of hydrophobic fibers such as polyester synthetic fibers may be used.

  The moisture-permeable and waterproof fabric of the present invention has a resin layer made of a synthetic polymer mainly composed of polyurethane resin on one side of the fiber fabric.

  Examples of the polyurethane resin include a polymer obtained by reacting an isocyanate component and a polyol component. As an isocyanate component, aromatic diisocyanate, aliphatic diisocyanate, alicyclic diisocyanate, etc. are used individually or in mixture, for example. Specifically, tolylene-2,4-diisocyanate, 4,4′-diphenylmethane diisocyanate, 1,6-hexane diisocyanate or 1,4-cyclohexane diisocyanate is used as a main component, and trifunctional or higher functional isocyanate is used as necessary. May be used. On the other hand, as a polyol component, polyether polyol, polyester polyol, etc. are used, for example. As the polyether polyol, for example, polyethylene glycol, polypropylene glycol, polytetraethylene glycol or the like is used. As the polyester polyol, for example, a reaction product of a diol such as ethylene glycol or propylene glycol and a dibasic acid such as adipic acid or sebacic acid, or a ring-opening polymer such as caprolactone can be used. A polymer of an acid monomer or a prepolymer thereof can also be used.

  The resin layer may contain a polymer other than the polyurethane resin, but the resin layer preferably contains 50% by mass or more of the polyurethane resin. Examples of the polymer other than the polyurethane resin include, for example, polyacrylic acid, polyvinyl chloride, polystyrene, polybutadiene, polyamino acid, polycarbonate and the like, copolymers thereof, the polymer modified with fluorine, silicon, and the like, and the above Examples thereof include copolymers.

  Furthermore, the thickness of the resin layer is required to be 10 to 40 μm, and preferably 15 to 30 μm. If the thickness is less than 10 μm, the waterproof performance is lowered. On the other hand, if it exceeds 40 μm, the texture of the moisture-permeable and waterproof fabric is impaired, and a large hole is formed in the resin layer, so that the washing durability is lowered.

  Moreover, the structure of the resin layer needs to be a substantially single layer structure. Thereby, it is possible to simultaneously improve the moisture permeability and waterproof performance of the moisture-permeable and waterproof fabric.

  Furthermore, the resin layer is a so-called microporous layer having many closed micropores, and the diameter of the micropores present in the resin layer is preferably 3.00 μm or less. When the diameter of the micropores exceeds 3.00 μm, waterproof performance and washing durability tend to be lowered. Here, the diameter of the fine hole means the diameter of a circle having the same area as the fine hole shown in the cross-sectional photograph of the resin layer.

Further, the moisture permeability of the moisture-permeable and waterproof fabric of the present invention is required to be 7000 to 12000 g / m ² · 24 hr. When the moisture permeability is within this range, when carrying out intense exercise, it is possible to prevent a feeling of stuffiness or coldness by wearing clothes using the moisture-permeable waterproof fabric of the present invention.

  And as a water pressure resistance of the moisture-permeable waterproof fabric of this invention, it is required that it is 120-300 kPa. When the water pressure resistance is within this range, when the user operates in a rainy environment, the infiltration of rainwater can be prevented by wearing clothes using the moisture-permeable waterproof fabric of the present invention.

  Next, the manufacturing method of the moisture-permeable waterproof fabric of this invention is demonstrated in detail.

  In the method for producing a moisture-permeable and waterproof fabric of the present invention, first, a synthetic polymer solution mainly composed of a polyurethane resin containing an inorganic fine powder is applied to one side of the fiber fabric described above.

  In this case, as the fiber fabric used in the production method of the present invention, a fabric obtained by subjecting the fiber fabric to a water repellent treatment or a calendar process may be used. This is a means for suppressing the penetration of the synthetic polymer solution into the fiber fabric. Examples of the water repellent used in the water repellent treatment include a paraffinic water repellent, a polysiloxane water repellent, and a fluorine water repellent. As a water repellent treatment method, for example, a method of applying a water dispersion of the above water repellent agent to a fiber fabric by a padding method or a spray method and then performing a heat treatment can be employed.

  The inorganic fine powder is uniformly dispersed in the synthetic polymer solution used in the present invention.

  The inorganic fine powder can be obtained, for example, by an inorganic fine powder pulverized by a normal wet pulverization method or a ball mill pulverization method, or a dry method such as a vapor phase oxidation method of a metal halide, a combustion hydrolysis method or an electric arc method. Inorganic fine powders can be used, and among these, silicon dioxide fine powders produced by these methods are preferably used. In addition, it is preferable that the surface of these fine powders is made hydrophobic by reacting with an organosilicon halide such as dimethyldichlorosilane or an alcohol to improve the dimensional stability of the resin layer.

  The average particle diameter of the inorganic fine powder is required to be 0.100 μm or less, and preferably 0.050 μm or less. When the average particle diameter exceeds 0.100 μm, a large hole is formed in the resin layer, so that the waterproof performance is deteriorated. Here, the average particle diameter is a median diameter, and needless to say, is a diameter of primary particles of the inorganic fine powder.

  Further, the inorganic fine powder is required to have an adsorption amount of N, N-dimethylformamide of 300 mL / 100 g or more. In the present invention, a solvent mainly composed of a polar organic solvent such as N, N-dimethylformamide is preferably used as a solvent for the synthetic polymer solution. Therefore, if the amount of N, N-dimethylformamide adsorbed in the inorganic fine powder is less than 300 mL / 100 g, the resin concentration on the surface of the inorganic fine powder does not decrease, so the number of micropores does not increase and the moisture permeability is excellent. A moisture-permeable and waterproof fabric cannot be obtained.

  Here, the adsorption amount of N, N-dimethylformamide is measured by the following method. That is, 5 g of inorganic fine powder was placed on a glass plate, and kneading with a stainless steel spatula was repeated every time one drop of N, N-dimethylformamide was added, and then abruptly with one drop of N, N-dimethylformamide. Means the volume (unit: mL) of N, N-dimethylformamide required immediately before it becomes soft, and uses N, N-dimethylformamide instead of boiled linseed oil described in JIS K-5101 It is.

  As the usage-amount of inorganic fine powder, it is necessary to use so that it may contain in the range of 15-50 mass% in the total solid content contained in a synthetic polymer solution. The synthetic polymer solution contains a solvent, a synthetic polymer, and inorganic fine powder. When the amount of the inorganic fine powder used is less than 15% by mass, a resin layer having a honeycomb skin core structure is formed. For this reason, the moisture permeation performance is lowered by the skin layer which is a non-porous layer, and the waterproof performance is lowered by the honeycomb layer having large pores. On the other hand, if it exceeds 50% by mass, the resin layer becomes brittle, the waterproof performance and washing durability are lowered, and the texture is also impaired.

  The synthetic polymer solution may contain various additives in addition to the inorganic fine powder as long as the effects of the present invention are not impaired.

  In the present invention, for the purpose of improving the peel resistance between the resin layer and the fiber fabric, it is preferable to add a compound having affinity for the resin and the fiber fabric to the synthetic polymer solution. . As such a compound, for example, an isocyanate compound can be used.

  As the isocyanate compound, for example, a compound containing 3 moles of tolylene 2,4-diisocyanate, diphenylmethane diisocyanate, isophorone diisocyanate, hexamethylene diisocyanate or these diisocyanates and active hydrogen (for example, trimethylolpropane, glycerin, etc.) 1 And triisocyanates obtained by addition reaction with moles.

The isocyanate compound may be in a form in which an isocyanate group is liberated, or may be in a form in which an additional block is formed with phenol, lactam, methyl ketone, etc., and dissociated by heat treatment. What is necessary is just to use properly according to a use. It is preferable to use it in the range of 0.1-10.0 mass% in conversion of solid content with respect to the total synthetic polymer solid content in a synthetic polymer solution as the usage-amount of an isocyanate compound. If the amount used is less than 0.1% by mass, the adhesive strength between the fiber fabric and the resin layer tends not to improve so much, which is not preferable. On the other hand, when the content exceeds 10.0% by mass, the texture of the moisture-permeable and waterproof fabric tends to be hard, and this is not preferable. For example, a knife coater, comma coater or The method of apply | coating using a reverse coater etc. is mention | raise | lifted. The coating amount may be determined in consideration of the solid content concentration of the synthetic polymer solution so that the thickness of the resin layer after drying is 10 to 40 μm, preferably 15 to 30 μm.

  After the synthetic polymer solution is applied to one side of the fiber fabric, in the present invention, it is immersed in an aqueous N, N-dimethylformamide solution having a concentration of 10 to 70%. This immersion solidifies the synthetic polymer solids contained in the synthetic polymer solution. If the concentration of the aqueous solution is less than 10%, the solidification rate of the synthetic polymer solids is too high, so that large pores having a diameter exceeding 3.00 μm are formed in the resin layer, and the waterproof performance and washing durability are reduced. . On the other hand, if it exceeds 70%, the solidification rate is too slow and the resin layer is in a form close to a nonporous layer, so that the moisture permeability performance is lowered.

  After soaking, in the present invention, hot water washing is performed. This is done to complete the solidification of the synthetic polymer solids. As hot water washing conditions, 30 to 80 ° C. for 5 to 15 minutes is preferable. After washing with hot water, the moisture-permeable and waterproof fabric of the present invention can be obtained by drying. The drying conditions are preferably 50 to 150 ° C. × 1 to 10 minutes.

  Furthermore, in the present invention, when the water-repellent treatment is performed after drying, the waterproof performance and washing durability can be further improved.

  According to the method for producing a moisture-permeable and waterproof fabric of the present invention, a substantially single-layered resin layer having a large number of fine holes is formed. About this reason, the present inventors guess as follows.

  In general, when a synthetic polymer solution mainly composed of a polyurethane resin is applied to a fiber fabric and then immersed in water, quick solvent substitution between water and N, N-dimethylformamide dissolving the synthetic polymer occurs. A resin layer having large holes of 50 μm is formed. However, when N, N-dimethylformamide aqueous solution is used instead of water, the solidification rate of the polyurethane resin can be delayed, and a resin layer having a form close to a nonporous layer is easily formed. Furthermore, N, N-dimethylformamide as a solvent is adsorbed on the surface of the inorganic fine powder, the concentration of the solvent is increased around the inorganic fine powder, and the polyurethane resin is solidified in that state, so that Holes are easily formed. It is assumed that a resin layer having a substantially single layer structure having a large number of fine holes is formed by these two actions.

Hereinafter, the present invention will be described more specifically with reference to examples. In addition, the measurement and evaluation of the performance of the moisture-permeable waterproof fabric in an Example and a comparative example were performed with the following method.
(1) Water pressure resistance Measured according to JIS L-1092 (high water pressure method).
(2) Washing durability The water pressure resistance (B) of the moisture permeable waterproof fabric after 10 times of washing according to JIS L-0217 (Method 103) was measured, and the water pressure resistance before washing according to the following formula The retention rate of the water pressure resistance (B) after washing with respect to (A) was calculated, and this value was regarded as the washing durability of the moisture-permeable and waterproof fabric.

(3) Moisture permeability Measured according to JIS L-1099 A-1 method (calcium chloride method).
(4) By texture handling, the texture was relatively evaluated in the following three stages.
○: Soft △: Slightly hard ×: Hard (5) Resin layer thickness and hole diameter Cross section photograph of the resin layer at a magnification of 1000 times using a S-4000 field emission scanning electron microscope manufactured by Hitachi, Ltd. The thickness was calculated based on this photograph. Further, using the same electron microscope, a cross-sectional photograph of the resin layer was taken at a magnification of 10,000 times, and the diameter of the hole was calculated based on this photograph as described above.

Example 1
A nylon 6 multifilament 78dtex48f was used as the warp and a plain fabric fiber fabric with a warp density of 115 / 2.54 cm and a weft density of 95 / 2.54 cm was woven. The obtained fiber fabric was scoured and then dyed with 1.0% omf of acid dye (“Kyanol Blue N2G (trade name)” manufactured by Nippon Kayaku Co., Ltd.). Thereafter, a 5% aqueous dispersion of a fluorine-based water repellent emulsion ("Asahi Guard 730 (trade name)" manufactured by Asahi Glass Co., Ltd.) was applied to the fiber fabric by a padding method (squeezing rate 40%), and after drying, Heat treatment was performed at 170 ° C. for 40 seconds, and then the fiber fabric obtained was calendered using a calender machine having a mirror roll at a temperature of 170 ° C., a pressure of 300 kPa, and a speed of 30 m / min.

Next, a synthetic polymer solution (solid content concentration 28% by mass, viscosity 15000 mPa · s (25 ° C.)) mainly composed of a polyurethane resin having a composition shown in the following prescription 1 was prepared. Using a knife over roll coater, 35 g / m ^{2 of the} synthetic polymer solution was applied to one side of the calendered fiber fabric. Immediately thereafter, the fiber fabric was immersed in a 40% strength N, N-dimethylformamide aqueous solution (25 ° C.) for 2 minutes to solidify the synthetic polymer solids. Thereafter, the fiber fabric was washed with warm water at 50 ° C. for 10 minutes and then dried to obtain the moisture-permeable and waterproof fabric of the present invention.

  The resin layer of the moisture permeable and waterproof fabric was a resin layer having a thickness of 20 μm and a substantially single layer structure having a large number of fine pores having a diameter of 0.05 to 0.70 μm. Further, the resin layer contained 26% by mass of silicon dioxide fine powder.

<Prescription 1>
Ester-type polyurethane resin solution (“Lackskin 1740-29B (trade name)”, solid content 28% by mass, manufactured by Seiko Chemical Co., Ltd.) 100 parts by mass
Isocyanate compound ("Rezamin (trade name)" 100% by mass, manufactured by Dainichi Seika Kogyo Co., Ltd.) 1 part by mass N, N-dimethylformamide 30 parts by mass Silicon dioxide fine powder ("Aerosil" manufactured by Nippon Aerosil Co., Ltd.) -974 (trade name) "average particle size: 0.012 μm, N, N-dimethylformamide adsorption amount: 350 mL / 100 g) 10 parts by mass

(Example 2)
The moisture permeable waterproof fabric of the present invention obtained in Example 1 was subjected to a water repellent treatment to obtain a moisture permeable waterproof fabric of the present invention having further improved waterproof performance. As the water repellent treatment, a mineral turpentine solution containing 3% by mass of a fluorine-based water repellent ("Asahi Guard AG-5850 (trade name)" manufactured by Asahi Glass Co., Ltd.) is permeable to moisture by the padding method (squeezing rate 25%) After giving to a waterproof fabric, it dried and heat-processed 150 degreeC x 1 minute.

(Comparative Example 1)
A moisture-permeable waterproof fabric was obtained in the same manner as in Example 2 except that water was used instead of an aqueous solution of N, N-dimethylformamide having a concentration of 40% for solidifying the synthetic polymer solids.

  The resin layer of the obtained moisture-permeable and waterproof fabric has a thickness of 25 μm, a large number of micropores having a diameter of 0.05 to 1.00 μm, and large pores having a diameter of 5.00 to 15.00 μm. It was a resin layer.

(Comparative Example 2)
The concentration of the aqueous N, N-dimethylformamide solution was set to 80% instead of 40%, and the immersion time in the aqueous N, N-dimethylformamide solution was set to 5 minutes instead of 2 minutes. A wet waterproof fabric was obtained.

  The resin layer of the obtained moisture-permeable and waterproof fabric had a thickness of 14 μm and was a nonporous layer.

(Comparative Example 3)
A moisture-permeable waterproof fabric was obtained in the same manner as in Example 2 except that the amount of silicon dioxide fine powder used was 1 part by mass instead of 10 parts by mass.

  The resin layer of the obtained moisture-permeable and waterproof fabric is a resin layer having a honeycomb skin core structure having a thickness of 25 μm and comprising a skin layer close to a nonporous layer and a honeycomb layer having large hollow holes. there were. The resin layer contained 3% by mass of silicon dioxide fine powder.

(Comparative Example 4)
A moisture-permeable and waterproof fabric was obtained in the same manner as in Example 2 except that the amount of silicon dioxide fine powder used was 35 parts by mass instead of 10 parts by mass.

  The resin layer of the obtained moisture-permeable and waterproof fabric was a resin layer having a thickness of 20 μm and a large number of fine holes having a diameter of 0.05 to 2.00 μm. The resin layer contained 55% by mass of silicon dioxide fine powder.

(Comparative Example 5)
A moisture-permeable and waterproof fabric was obtained in the same manner as in Example 2 except that the coating amount of the synthetic polymer solution was 15 g / m ² instead of 35 g / m ² .

  The resin layer of the obtained moisture-permeable and waterproof fabric was a resin layer having a thickness of 8 μm and a large number of fine holes having a diameter of 0.05 to 0.50 μm.

(Comparative Example 6)
A moisture-permeable and waterproof fabric was obtained in the same manner as in Example 2 except that the coating amount of the polymer solution was 100 g / m ² instead of 35 g / m ² .

  The resin layer of the obtained moisture-permeable and waterproof fabric has a thickness of 60 μm, has a large number of fine holes with a diameter of 0.05 to 2.00, and also has large holes with a diameter of 5.00 to 40.00 μm. It was a resin layer.

  The performance and evaluation of each moisture permeable and waterproof fabric obtained in Examples 1-2 and Comparative Examples 1-6 are shown in Table 1 below.

  As is apparent from Table 1, the moisture-permeable and waterproof fabric of the present invention has high moisture permeability and waterproof performance, and is excellent in texture and washing durability.

  On the other hand, the moisture permeable waterproof fabric of Comparative Example 1 formed large pores in the resin layer by using water when solidifying the synthetic polymer solids. Therefore, it became inferior in waterproof performance. In addition, the result was inferior in washing durability.

  In the moisture permeable waterproof fabric of Comparative Example 2, the concentration of the aqueous N, N-dimethylformamide solution is too high for solidifying the synthetic polymer solids, so the solidification rate of the polyurethane resin is very slow and the resin layer is nonporous. It became a quality layer. For this reason, although the obtained moisture-permeable waterproof fabric was excellent in waterproof performance and washing durability, the moisture-permeable performance was extremely inferior.

  The moisture permeable waterproof fabric of Comparative Example 3 has a honeycomb skin core structure because the amount of fine silicon dioxide powder contained in the resin layer is too small, and is inferior in waterproof performance and moisture permeability performance. It became a thing.

  The moisture permeable and waterproof fabric of Comparative Example 4 has an excessive amount of silicon dioxide fine powder contained in the resin layer, so that the resin layer is brittle, not only inferior in waterproof performance and washing durability, but also lacks in texture. became.

  The moisture-permeable waterproof fabric of Comparative Example 5 was inferior in waterproof performance because the resin layer was too thin.

  And the moisture-permeable waterproof fabric of Comparative Example 6 lacks the texture because the thickness of the resin layer is too thick, and furthermore, there are large holes in the resin layer that have a diameter exceeding 3.00 μm. It was inferior in washing durability.

(Example 3)
Polyethylene terephthalate multifilament 83dtex48f was used as the warp, and a plain fabric fiber fabric with a warp density of 110 / 2.54 cm and a weft density of 90 / 2.54 cm was woven. The obtained fiber fabric was scoured and then dyed with 0.5% omf by disperse dyeing (“Dianix Yellow SE-G (trade name)” manufactured by Dystar Japan Co., Ltd.). Thereafter, a moisture-permeable and waterproof fabric of the present invention was obtained in the same manner as in Example 2 except that the coating amount of the synthetic polymer solution was 50 g / m ² instead of 35 g / m ² .

  The resin layer of the obtained moisture-permeable and waterproof fabric was a resin layer having a thickness of 30 μm and a large number of fine pores having a diameter of 0.05 to 0.09 μm. Further, the resin layer contained 26% by mass of fine silicon dioxide powder.

(Comparative Example 7)
A moisture-permeable and waterproof fabric was obtained in the same manner as in Example 3 except that water was used instead of an aqueous solution of N, N-dimethylformamide having a concentration of 40% for solidifying the synthetic polymer solids.

  The resin layer of the obtained moisture-permeable and waterproof fabric has a thickness of 40 μm, a large number of fine holes having a diameter of 0.05 to 1.00 μm, and a large hole having a diameter of 5.00 to 20.00 μm. It was a resin layer.

  The performance and evaluation of each moisture permeable and waterproof fabric obtained in Example 3 and Comparative Example 7 are shown in Table 2 below.

  As is apparent from Table 2, the moisture-permeable and waterproof fabric of the present invention has high moisture permeability and waterproof performance, and is excellent in texture and washing durability. In addition, since the moisture-permeable waterproof fabric of Example 3 uses a fiber fabric made of polyethylene terephthalate multifilament as the fiber fabric, it is slightly better in waterproof performance than Examples 1 and 2, but moisture-permeable performance. The result was slightly inferior.

On the other hand, the moisture-permeable waterproof fabric of Comparative Example 7 was inferior in waterproof performance and washing durability for the same reason as the moisture-permeable waterproof fabric of Comparative Example 1.

Claims (2)

The fiber fabric has a substantially single-layered resin layer having a thickness of 10 to 40 μm made of a synthetic polymer mainly composed of a polyurethane resin on one side of the fiber fabric, and a plurality of micropores are formed in the resin layer. A moisture-permeable waterproof fabric characterized by having a humidity of 7000 to 12000 g / m ² · 24 hrs and a water pressure resistance of 120 to 300 kPa. Synthetic polymer mainly composed of polyurethane resin containing 15 to 50% by mass of an inorganic fine powder having an average particle size of 0.100 μm or less and an adsorption amount of N, N-dimethylformamide of 300 mL / 100 g or more in the total solid content. A method for producing a moisture-permeable and waterproof fabric, wherein the solution is applied to one side of a fiber fabric, then immersed in an aqueous solution of N, N-dimethylformamide having a concentration of 10 to 70%, then washed with hot water and dried.