JP2001303452A - Method for manufacturing dew condensation-preventive moisture-permeable waterproof coated fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a dew condensation-preventive moisture-permeable waterproof coated fabric having high degree of moisture permeability and waterproofness, and excellent in dew condensation preventive property. SOLUTION: On a fiber fabric, a synthetic polymer solution mainly composed of two kinds of polyurethane resins containing a hydrophobic silicon dioxide fine powder and a hydrophilic inorganic fine powder, and having different coagulation values is applied, and the fabric is subjected to a wet-type film-formation to form a porous resin film on it. Further, on the resulting porous resin film, a synthetic polymer solution mainly composed of a polyurethane resin containing a hydrophilic inorganic fine powder is applied, and the fabric is subjected to a wet-type film formation to form a resin film having no pores.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a coated fabric having excellent moisture permeability, waterproofing properties and dew condensation preventing properties for use in various types of clothing such as raincoats, outer garments, mountain climbing garments and the like.

[0002]

2. Description of the Related Art A moisture-permeable waterproof fabric having both moisture permeability and waterproofness has a function of discharging water vapor caused by sweating from the body out of clothes and a function of preventing rain from entering clothes. In order to provide these functions, high-density woven fabric in which yarns are woven at high density, or a polyurethane resin, a polyamino acid resin, a polyester resin, a polyamide resin, a polytetrafluoroethylene resin, etc. are coated or laminated on a fabric. What is well known. These are used for sports clothing, winter clothing, etc., and among them, they are often used in sports and outdoor clothing fields where the amount of sweat caused by exercise is relatively large, such as skiing, athletic,
It is an indispensable material in the field of mountaineering. Among such conventional moisture-permeable and waterproof fabrics, the high-density woven fabric type has a sufficient moisture-permeable performance, but the waterproof performance is at most 10 kPa.
Among the types having a resin layer, those having a perforated resin layer are generally easy to obtain excellent moisture permeability, but the waterproof performance is only about 20 to 30 kPa, while the resin layer is non-porous. Although it is easy to obtain excellent waterproof performance, it has little or no moisture permeability, or at most only about 4000 g / m ² · 24 hrs.

In order to compensate for such a drawback, a perforated high moisture permeable resin layer is first formed on a fiber cloth, and a non-porous resin layer is formed thereon to provide excellent moisture permeability and waterproofness. Attempts have been made to obtain a performance. Although this method can provide excellent waterproof performance, the moisture permeability is at most 3,000 to 5,000.
g / m ² · 24 hrs. Therefore, the present inventors disclosed in Japanese Patent Application Laid-Open No. 6-280163 1% by mass of an inorganic fine powder having an average particle size of 1 μm or less and an adsorption amount of N, N-dimethylformamide of 200 ml / 100 g or more. A method of processing a coated fabric for forming a polyurethane resin film containing the above is proposed, and the moisture permeability is 7000 g / m ² · 24 hrs or more, and the waterproof performance is 5
It succeeded in obtaining a moisture-permeable waterproof fabric of 8.8 kPa or more. However, even if the cloth having such high moisture permeability is worn, if the environmental temperature is lowered during the wearing,
There is a problem that water droplets adhere to the coated surface, causing a sticky feeling and a cold feeling, which is uncomfortable.

On the production side, when a coating process is performed on a highly uneven fabric or a fabric with a high fineness, the resin film becomes inevitably thicker in order to obtain high waterproof performance. When the thickness is large, there is a disadvantage that the moisture permeability and the dew condensation preventing property decrease.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has both a high waterproofing property and a high moisture-permeating property, and has an excellent dew-condensing property. The purpose is to obtain a coated fabric.

[0006]

The present invention achieves the above object and has the following constitution. That is, the present invention provides a method for producing a mixed resin solution comprising a synthetic resin A mainly composed of a polyurethane resin and a synthetic polymer B mainly composed of a polyurethane resin having a different coagulation value from the synthetic polymer A mainly composed of the polyurethane resin. Is 0.1 μm or less,
3 to 30% by mass of a hydrophobic silicon dioxide fine powder having an N, N-dimethylformamide adsorption amount of 300 ml / 100 g or more, and 1 to 10% by mass of a hydrophilic inorganic fine powder having a maximum particle size of 10 μm or less. Water-resistant pressure of 60 to 200 kPa, moisture permeability of 8000 to 12000 g /
Method for producing dew-preventing moisture-permeable waterproof coated fabric of m ² · 24 hrs ”and“ Synthetic polymer A mainly composed of polyurethane resin, and synthetic polymer mainly composed of polyurethane resin having a different coagulation value from that of synthetic polymer A mainly composed of polyurethane resin. In the mixed resin solution consisting of B, the average particle size is 0.1 μm or less,
3 to 30% by mass of a hydrophobic silicon dioxide fine powder having an N, N-dimethylformamide adsorption amount of 300 ml / 100 g or more, and 1 to 10% by mass of a hydrophilic inorganic fine powder having a maximum particle size of 10 μm or less. And wet coating is performed by applying it on a fiber cloth, and thereafter, a fine inorganic powder having a maximum particle size of 10 μm or less and hydrophilicity of 0 to 1 is added.
A water resistant pressure of 1 characterized in that a synthetic polymer C mainly composed of a polyurethane resin containing 0% by mass is applied to form a dry film.
50 to 800 kPa, moisture permeability 5000 to 9000 g / m ^2.
A method for producing a 24 hrs dew-preventing moisture-permeable waterproof coating fabric ".

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. Examples of the fiber cloth used in the present invention include polyamide-based synthetic fibers such as nylon 6 and nylon 66, polyester-based synthetic fibers such as polyethylene terephthalate, polyacrylonitrile-based synthetic fibers, polyvinyl alcohol-based synthetic fibers, and triacetate. Woven fabrics, knitted fabrics, nonwoven fabrics, etc. comprising semi-synthetic fibers or mixed fibers of nylon 6 / cotton, polyethylene terephthalate / cotton and the like.

In the present invention, the above-mentioned fiber cloth which has been subjected to a water repellent treatment may be used. This is one means for preventing the penetration of the resin solution into the inside of the fabric during the production of the moisture-permeable waterproof cloth. As the water repellent in this case, a known substance such as a paraffin-based water repellent, a polysiloxane-based water repellent, or a fluorine-based water repellent may be used. A known method such as a spray method may be used. When particularly good water repellency is required, a fluorine-based water repellent is used. For example, Asahi Guard 730 (manufactured by Asahi Glass Co., Ltd., fluorine-based water-repellent emulsion) is used. After padding with a 5% aqueous dispersion (a squeezing rate of 35%), a heat treatment at 160 ° C. for 1 minute may be performed.

The synthetic polymer solution mainly composed of a polyurethane resin used in the present invention means a polymer solution mainly containing a polar organic solvent such as N, N-dimethylformamide containing 50 to 100% by mass of a polyurethane component. As the synthetic polymer, for example, polyacrylic acid, polyvinyl chloride,
Polystyrene, polybutadiene and the like, and a copolymer thereof may be contained in a range of less than 50% by mass.
Compounds modified with fluorine, silicon or the like can also be used in the present invention.

The polyurethane resin itself is a copolymer obtained by reacting a polyisocyanate and a polyol, and uses an aromatic diisocyanate, an aliphatic diisocyanate or an alicyclic diisocyanate alone or a mixture thereof as an isocyanate component. Tolylene 2,4-diisocyanate, 4,4'-diphenylmethane diisocyanate, 1,6-hexane diisocyanate, 1,4-cyclohexane diisocyanate, or the like may be used as a main component, and if necessary, trifunctional or higher functional isocyanate may be used.

As the polyol component, a polyether polyol or a polyester polyol is used. As the polyether polyol, for example, polyethylene glycol, polypropylene glycol, polytetramethylene glycol, or the like is used. As the polyester polyol, for example, ethylene glycol is used. A reaction product of a diol such as propylene glycol and a dibasic acid such as adipic acid or sebacic acid or a ring-opening polymer such as caprolactone is used.

In the present invention, a synthetic polymer A mainly composed of a polyurethane resin and a synthetic polymer B mainly composed of a polyurethane resin having a different coagulation value from the synthetic polymer A mainly composed of the polyurethane resin are used. The coagulation value as used herein means that the water as the coagulation liquid is added little by little while stirring 100 g of a resin solution obtained by diluting the polyurethane resin-based synthetic polymer with a solvent (N, N-dimethylformamide) to a concentration of 15%. It means the volume of water required immediately before the start of gelation when dropped. In the present invention, by using a mixture of resins having different coagulation values, the number of holes in the fine hollow portion is increased,
Although the moisture permeability is improved, if there is too much difference in the coagulation value, it becomes a factor that the water pressure decreases with the improvement of the moisture permeability,
The difference in coagulation value is preferably within 1.5 (high coagulation value / low coagulation value).

In the present invention, in order to exhibit a water pressure of 60 to 200 kPa and a moisture permeability of 8000 to 12000 g / m ² · 24 hrs, the above-mentioned synthetic polymer A mainly composed of a polyurethane resin and the synthetic polymer mainly composed of the polyurethane resin are used. In a mixed resin solution composed of the combined polymer A and a synthetic polymer B mainly composed of a polyurethane resin having a different coagulation value, the average particle size is 0.1 μm or less and the amount of adsorbed N, N-dimethylformamide is 30.
It contains 3 to 30% by mass of hydrophobic silicon dioxide fine powder of 0 ml / 100 g or more, and 1 to 10% by mass of hydrophilic inorganic fine powder having a maximum particle size of 10 μm or less.

The hydrophobic silicon dioxide fine powder used in the present invention includes a number of silanol groups present on the surface of a fine powder obtained by a dry method such as a vapor phase oxidation method of metal halide, a combustion hydrolysis method and an electric arc method. Can be reduced by reacting with an organic silicon halide such as dimethyldichlorosilane or an alcohol to decrease the hydrophobicity. The fine powder obtained by these methods generally has a particle size of 0.05 μm or less, is substantially nonporous, and has a very large amount of adsorbed N, N-dimethylformamide.

The amount of N, N-dimethylformamide adsorbed here means that 5 g of the fine powder is placed on a flat glass plate.
Each time one drop of N, N-dimethylformamide was added, the kneading operation using a stainless steel spatula was repeated, and the N, N-dimethyl which was required immediately before softening rapidly with one drop of N, N-dimethylformamide was used. Means the volume of formamide (unit: milliliter)
SK-5101 is obtained by using N, N-dimethylformamide instead of oil in boiled linseed.

The hydrophobic silicon dioxide fine powder used in the present invention is 3% based on the above-mentioned synthetic polymer mainly composed of a polyurethane resin.
When the amount is less than 3% by mass, the number of pores in the fine hollow portion of the obtained coated fabric is reduced, and high moisture permeability is hardly obtained. It is not preferable because the improvement in the wet performance is small and the resin film becomes brittle.

The inorganic fine powder having hydrophilicity used in the present invention includes known gas phase methods, liquid phase methods, autoclave methods,
Using a mechanochemical method or the like, the surface of an inorganic substance such as aluminum oxide, titanium oxide, silica gel, zinc oxide, magnesia, etc. was treated with an alcohol, an organic acid, an organic amine, an organic silyl compound, etc., and the surface of the fine powder was hydrophilized. Although it is not particularly limited in the present invention, it is preferable to use hydrophilic silicon dioxide-based fine powder.

The hydrophilic silicon dioxide-based fine powder used herein is a porous hydrated silica or hydrated silica obtained by a wet method such as a method of neutralizing sodium silicate with an acid or a method of decomposing acidic clay as a raw material with sulfuric acid. Examples thereof include fine powder mainly composed of silicic acid and fine powder having a hydrophilic group such as a silanol group obtained by the dry method.

The hydrophilic silicon dioxide fine powder may be a fine powder containing at least 50% of a silicon dioxide component. For example, it may contain calcium oxide, magnesium oxide, aluminum oxide and the like as other components. It does not interfere with other inorganic substances, pigments, fillers and the like.

The maximum particle size of the hydrophilic inorganic fine powder is as follows:
It is necessary that the thickness be 10 μm or less, and if it exceeds 10 μm, it is not preferable because it adversely affects the waterproof performance and the like of the obtained coated fabric. The addition amount of the fine powder is required to be 1 to 10% by mass based on the above-mentioned synthetic polymer mainly composed of a polyurethane resin, and if it is less than 1% by mass, the dew condensation preventing property of the obtained coated fabric is poorly improved, 1
Use of more than 0% by mass is not preferred because the dew condensation preventing property is little improved, the coating resin becomes unstable, and the working efficiency deteriorates.

In the present invention, a mixed resin solution mainly containing two kinds of polyurethane resins having different coagulation values, each containing the above-mentioned hydrophobic silicon dioxide fine powder and hydrophilic inorganic fine powder, is applied to a fiber cloth, and is wet-processed. The membrane is formed to create a porous resin membrane. As a method of applying to the fiber cloth, a normal coating method, for example, a knife coater, a comma coater, a reverse coater or the like may be appropriately applied, and the coating amount may be adjusted to a water pressure of 60 kPa or more. Dry film mass is 10 g / m ² or more, preferably 15 g / m ² or more.
The application amount may be adjusted so as to be g / m ² or more.

In the present invention, a compound having a high affinity for the resin and the fiber cloth may be used in combination in order to improve the peeling resistance between the resin layer and the fiber cloth. As the compound, an isocyanate compound can be suitably used, and as the isocyanate compound, tolylene 2,4-diisocyanate, diphenylmethane diisocyanate, isophorone diisocyanate, hexamethylene diisocyanate, or a compound containing 3 mol of these diisocyanates and active hydrogen ( For example, trimethylolpropane,
Triisocyanates obtained by addition reaction with 1 mol of glycerin or the like can be used.

The above-mentioned isocyanates may be in a form in which an isocyanate group is released, or in a form in which an addition block is formed with phenol, lactam, methyl ketone or the like and dissociated by heat treatment. It may be properly used depending on workability, use, and the like.
The amount used when using the isocyanate compound,
It is preferable to use 0.1 to 10% by mass of the synthetic polymer mixed solution mainly composed of the polyurethane resin.

In order to further improve the waterproof performance, the coated fabric may be subjected to a water-repellent treatment after the wet coating. For the water-repellent treatment, a known water-repellent treatment method generally used as described above may be employed.

In the present invention, the average particle diameter is contained in a mixed resin solution comprising a synthetic polymer A mainly composed of a polyurethane resin and a synthetic polymer B mainly composed of a polyurethane resin having a different coagulation value from the synthetic polymer A mainly composed of the polyurethane resin. Is 0.1 μm or less and the amount of N, N-dimethylformamide adsorbed is 3 μm.
3 to 30% by mass of a hydrophobic silicon dioxide fine powder of 00 ml / 100 g or more, and 1 to 10% by mass of a hydrophilic inorganic powder having a maximum particle size of 10 μm or less are applied to a fiber cloth, A perforated resin film is formed by wet film formation, and thereafter, a polyurethane resin-based synthetic polymer C containing 0 to 10% by mass of a hydrophilic inorganic fine powder having a maximum particle size of 10 μm or less is applied. Then, dry film formation is performed to form a non-porous resin film.

As the synthetic polymer mainly composed of a polyurethane resin used for the dry film formation, the same polyurethane resin as described above may be used, and the above-mentioned polymer solution mainly containing a polar organic solvent such as N, N-dimethylformamide is used. However, it is preferable to use a polymer solution mainly composed of a volatile solvent such as toluene, methyl ethyl ketone, or ethyl acetate in view of the erosion property of the porous resin film, processing cost, and the like.

As the inorganic fine powder having hydrophilicity used herein, the above-mentioned inorganic fine powder may be used. The amount of addition may be determined in consideration of the thickness of the obtained polyurethane resin film, dew condensation preventing performance, and the like.
The amount may be appropriately determined within the range of 10% by mass or less. However, if the amount is more than 10% by mass, it is not preferable because the dew condensation preventing property is poorly improved, the washing durability is lowered, and the texture is hardened.

In the present invention, a synthetic polymer solution mainly composed of a polyurethane resin containing an inorganic fine powder having hydrophilicity is coated on a porous resin film by using the above-mentioned coating apparatus, dried and dried. Film formation is performed to form a non-porous resin film. The coating amount of the polyurethane resin containing the inorganic fine powder having hydrophilicity is 150 to 700 KPa with water pressure and 50 kPa.
00~9000g / m ² · 24hrs may be suitably determined so as to have a moisture permeability but dry resin film mass 0.5 g / m ²
15 g / m ² or less, preferably 1 g / m ² or more and 10 g / m ² or less.
m ² or less.

[0029]

[Function] Two types of polyurethane resin-based synthetic polymers having different coagulation values in which hydrophobic silicon dioxide fine powder and hydrophilic inorganic fine powder are uniformly dispersed are applied on a fiber cloth, and wet coagulation is performed. The present inventor speculates as follows why it is possible to have excellent performance satisfying all of the moisture permeability performance, the waterproof performance and the dew condensation prevention performance. In wet coagulation, water as coagulation liquid and N, N- as resin solvent are used.
When dimethylformamide is mixed and the solvent is rapidly released from the resin solution, solidification of the resin starts. At this time, if the hydrophobic silicon dioxide fine powder is uniformly dispersed in the resin solution, the fineness of the resin is reduced. The surface of the powder has a higher concentration of N, N-dimethylformamide in the resin solution than other parts, in other words, a lower concentration of N, N-dimethylformamide of a synthetic polymer mainly composed of a polyurethane resin.

For this reason, in the wet coagulation process, water as a coagulation liquid is first replaced by N, N-dimethylformamide on the surface of the fine powder, coagulation starts rapidly around the coagulation liquid, and thereafter coagulation of the resin having a low coagulation value. Begins, and finally the solidification of the resin with a high solidification value starts, so the number of cavities in the honeycomb skin core structure unique to urethane resin increases, and countless 1μ around the fine powder that is uniformly dispersed.
It is presumed that, since micropores of m or less are exhibited, both moisture permeability and waterproof performance can be maintained high, and high moisture permeability can be maintained even when the coating resin film becomes thick.

At the same time, the hydrophilic silicon dioxide fine powder also exists in the entire layer of the resin film in the porous form as described above, and water vapor is not released only from the film surface.
Since water vapor is released from the entire resin film layer, it has excellent dew condensation preventing properties.

When a non-porous resin film is further formed on the porous resin film, the waterproofness is further improved due to the non-porosity of the resin film, and the non-porous resin film has hydrophilicity. Since the inorganic fine powder is uniformly dispersed, it is presumed that the inorganic fine powder has excellent dew condensation preventing properties.

[0033]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples. Measurement and evaluation of the performance of the fabric in the examples were performed by the following methods. (1) Water pressure resistance JIS L-1092 (high water pressure method) (2) Moisture permeability JIS L-1099 (A-1 method) (3) Dew condensation A stainless steel cup (inside diameter and height) containing 500 ml of hot water at 40 ° C. 10 cm in thickness and 1 mm in thickness), with the coated surface facing the direction of warm water using a rubber band (distance between the coated surface and the water surface: 3.5 cm).
It was placed in an environment at a temperature of 60 ° C. × 60% RH, and after 15 minutes, the amount of water collected on the coated surface was defined as the amount of dew condensation.

Example 1 Nylon multifilament 120 for both warp and weft
Using decitex / 24 filament, warp density 8
Weaving a ripstop taffeta with 0 threads / 2.5 cm and a weft density of 76 threads / 2.5 cm, scouring and dyeing by a usual method (Kyanol Navy Blue R, manufactured by Nippon Kayaku Co., Ltd.)
3% omf), padding (aqueous reduction 40%) with a 7% aqueous dispersion of an emulsion type fluorine-based water repellent Asahigard LS-317 (manufactured by Asahi Glass Co., Ltd.), drying, and drying at 170 ° C. Heat treatment was performed for 40 seconds. Next, using a calendering machine having a mirror-finished roll, a temperature of 170
Calendering was performed under the conditions of ° C, a pressure of 400 kPa, and a speed of 25 m / min, to obtain a nylon base fabric for coating.

Next, a polyurethane resin solution having a solid content concentration of 27% and a viscosity of 19000 mPa · s (25 ° C.) having the composition shown in the following prescription 1 was applied to the above-mentioned calender surface of the nylon base cloth using a knife over roll coater. Quantity 12
Immediately after application at 0 g / m ² and 140 g / m ² ,
The resin was solidified by immersion in water at 5 ° C. for 40 seconds, followed by washing in warm water at 50 ° C. for 10 minutes, followed by drying to form a porous resin film. The porous resin film contained 13% by mass of hydrophobic silicon dioxide fine powder and 4.5% by mass of hydrophilic silicon dioxide type fine powder.

Formulation 1 75 parts of rack skin 1740-29B (ester type polyurethane resin with a coagulation value of 7.3 cc, manufactured by Seiko Kasei Co., Ltd.) Resin) Rezamin X 1 part (Dainichi Seika Kogyo Co., Ltd., isocyanate compound) N, N-dimethylformamide 25 parts AEROSIL R0-972 4.5 parts (Nippon Aerosil Co., Ltd., average particle size is about 0.016 μm
Hydrophobic silicon dioxide fine powder having an adsorbed amount of 350 ml / 100 g of m, N, N-dimethylformamide) Nipsil E200 1.5 parts 製 Nippon Silica Industry Co., Ltd., water content having a particle size of 9 μm or less (average particle size 2.5 μm) Type hydrophilic silicon dioxide fine powder.

Further, the above-mentioned coated nylon fabric was padded with a 6% aqueous dispersion of Asahigard LS-317 (squeezing ratio: 30%), dried, and heat-treated at 170 ° C. for 40 seconds to prevent dew condensation of the present invention. A water-permeable, moisture-permeable waterproof coated fabric (referred to as Example 1) was obtained.

For comparison with the present invention, rack skin 17 was prepared except for Rezamine CU4555 of Formulation 1 in Example 1.
A moisture-permeable waterproof coating fabric for comparison (referred to as Comparative Example 1) was obtained in exactly the same manner as in Example 1 except that 100 parts of 40-29B was used. The performances of the present invention and the comparative coated fabric were measured, and the results are shown in Table 1.

[0039]

[Table 1]

As is evident from Table 1, the dew-condensing, moisture-permeable waterproof coating fabric of the present invention has excellent water pressure resistance and moisture permeability, has good dew-condensation prevention properties, and is made of a coating resin. It can be seen that there is no performance decrease due to an increase in the coating amount.

Example 2 A cationic dyeable polyester filament 170 dtex / 96 filament was used for both the warp and the weft.
Warp density 100 yarns / 2.5 cm, weft yarn density 75 yarns / 2.
Weave a 5cm plain weave, scour and dye by the usual method (Nippon Kayaku Co., Ltd., Kyacryl Blue GRL 2% Om
After f), 6% of Asahigard LS-317 (manufactured by Asahi Glass Co., Ltd.) of an emulsion type fluorine-based water repellent
After padding (squeezing ratio 40%) with an aqueous dispersion, and drying,
Heat treatment was performed at 70 ° C. for 30 seconds. Next, using a calendering machine having a mirror roll, calendering was performed under the conditions of a temperature of 180 ° C., a pressure of 300 kPa, and a speed of 30 m / min to obtain a polyester base fabric for coating.

Then, using the same procedure as in Example 1 at a coating amount of 110 g / m ^{2 on} the calender surface of the polyester base fabric for coating, using the same procedure as in Example 1, An anti-condensing, moisture-permeable, waterproof coating fabric of the invention (Example 2) was obtained.

For comparison with the present invention, AEROSIL R-972 of Formula 1 in Example 1 and Nipsil E2 were prepared using the coated polyester base fabric of Example 2.
A moisture-permeable waterproof coating fabric for comparison (hereinafter referred to as Comparative Example 2) was obtained in exactly the same manner as in Example 2 except for excluding 00.

For the purpose of comparison with the present invention, the polyester base fabric for coating of Example 2 was used, and the procedure was the same as in Example 2 except that AEROSIL R-972 of Formulation 1 in Example 1 was used. A moisture-permeable waterproof coating fabric for comparison (Comparative Example 3) was obtained.

Further, for comparison with the present invention, the same moisture-permeable and waterproofing as in Example 2 was carried out by using the polyester base fabric for coating of Example 2 except that Nipsil E200 in Example 1 was used. A coated fabric (referred to as Comparative Example 4) was obtained. The performances of the present invention and the comparative coated fabric were measured, and the results are shown in Table 2.

[0046]

[Table 2]

As is clear from Table 2, the moisture-permeable waterproof coating fabric of the present invention has excellent water pressure resistance and moisture permeability, and also has good dew condensation preventing properties.

Example 3 Using the dew-preventing, moisture-permeable, waterproof polyester-coated woven fabric obtained in Example 2, on a perforated resin membrane of the woven fabric, the composition shown in the following formulation 2 was used, having a solid content of 25% and a viscosity of 25%. 2500
A mPa · s (25 ° C.) polyurethane resin solution was applied using a floating knife coater so that the coating amount per m ² became 8 g, 16 g, 26 g, and 36 g, respectively, and then dried at 100 ° C. for 3 minutes. And the applied amount of dry resin per 1 m ² is 2.0 g, 4.0 g, 6.5 g,
9.0 g of a dew-preventing, moisture-permeable, waterproof-coated fabric of the present invention (referred to as Example 3) was obtained. The non-porous resin film contained 5% by mass of hydrophilic silicon dioxide fine powder.

Formulation 2 Rackskin U2514-1 100 parts (Ether type polyurethane resin manufactured by Seiko Chemical Co., Ltd.) Isopropyl alcohol 10 parts Toluene 15 parts Nipsil E200 1.5 parts 製 Nippon Silica Industry Co., Ltd., particle size of 9 μm or less (Hydrophilic silicon dioxide fine powder of an average particle diameter of 2.5 μm).

For comparison with the present invention, the moisture-permeable waterproof coated fabric obtained in Comparative Example 4 was used in exactly the same manner as in Example 3 to produce a comparative moisture-permeable waterproof coated fabric (Comparative Example 5). .). The performance of the present invention and the comparative coated fabric were measured, and the results were combined.
It was shown to.

[0051]

[Table 3]

As is evident from Table 3, the moisture-permeable and moisture-permeable waterproof fabric coated with dew condensation of the present invention has excellent water pressure and moisture permeability and also has good dew-condensation resistance. .

Example 4 Nylon multifilament 78 dtex / 68 filament was used for both the warp and the weft, and the warp density was 12
After weaving a plain weave of 0 threads / 2.5 cm and a weft density of 95 threads / 2.5 cm, scouring and dyeing (Kyanol Navy Blue R 3% Omf, manufactured by Nippon Kayaku Co., Ltd.) by a usual method, and then emulsifying Asahigard LS-317 (manufactured by Asahi Glass Co., Ltd.), an 8% aqueous dispersion of a type of fluorine-based water repellent, is padded (aperture 35%), dried, and dried at 170 ° C. for 30 days
Heat treatment was performed for 2 seconds. Next, using a calendering machine having a mirror roll, the temperature was 170 ° C., the pressure was 300 kP.
a, Calendering was performed at a speed of 25 m / min to obtain a nylon base fabric for coating.

Next, a polyurethane resin solution having a solid content concentration of 26% and a viscosity of 11,000 mPa · s (25 ° C.) having the composition shown in the following prescription 3 was applied to the above calender surface with a knife over roll coater at a coating amount of 70 g / m 2. Immediately after application in ^2, dipped in water at 15 ° C. for 40 seconds to solidify the resin, then washed in warm water at 50 ° C. for 10 minutes, and dried to form a perforated material mainly composed of polyurethane resin. A resin film was formed. The porous resin film contained 14% by mass of hydrophobic silicon dioxide fine powder and 5.5% by mass of hydrophilic silicon dioxide type fine powder.

Formulation 3 Rack Skin 1740-29B 75 parts (Eco polyurethane resin with a coagulation value of 7.3 cc, manufactured by Seiko Kasei Co., Ltd.) Resamine CU4555 25 parts (Eco polyurethane with a coagulation value of 5.5 cc, manufactured by Dainichi Seika Industry Co., Ltd.) Resin) 1 part of Rezamin X (isocyanate compound manufactured by Dainichi Seika Kogyo Co., Ltd.) 35 parts of N, N-dimethylformamide 5 parts of AEROSIL R-974 5 parts (manufactured by Nippon Aerosil Co., Ltd., average particle size is about 0.012 μm
m, N, N-Dimethylformamide Adsorbed amount of 350 ml / 100 g hydrophobic silicon dioxide fine powder) Nipsil VN3 1.5 parts 製 Nippon Silica Industry Co., Ltd., average particle size 0.016 μm
Water-containing hydrophilic silicon dioxide fine powder.

For comparison with the present invention, Formulation 3 of Example 4
The same procedure as in Example 4 except that AEROSIL R-974 was replaced with 0.7 part (hydrophobic silicon dioxide fine powder: 2.2% by mass) was performed. .).

For comparison with the present invention, formulation 3 of Example 4
(Comparative Example 7), except that AEROSIL R-974 was replaced with 15 parts (hydrophobic silicon dioxide fine powder was 32% by mass) in exactly the same manner as in Example 4. I got

For comparison with the present invention, formulation 3 of Example 4
The same procedure as in Example 4 was repeated except that Nipsil VN3 was replaced by 0.3 part (0.9% by mass of hydrophilic silicon dioxide-based fine powder). To do).

For comparison with the present invention, Formulation 3 of Example 4
By the same method as in Example 4 except that 4.5 parts of Nipsil VN3 was replaced (hydrophilic silicon dioxide-based fine powder: 12% by mass), a comparative moisture-permeable waterproof coating fabric (Comparative Example 9). ) Got. The performances of the present invention and the comparative coated fabric were measured, and the results were combined.
It was shown to.

[0060]

[Table 4]

As is evident from Table 4, the dew condensation-preventive moisture-permeable waterproof coating fabric of the present invention has excellent water pressure and moisture permeability, and also has good dew-prevention properties. .

Example 5 Using the moisture-permeable and moisture-permeable waterproof-coated fabric of Example 4 on this porous resin membrane, the composition shown in the following formulation 4 was used, having a solid content concentration of 15% and a viscosity of 1200 mPa · s (25 C) using a floating knife coater so that the coating amount is 10 g / m ^2, and then dried at 100 ° C. for 3 minutes to form a non-porous resin film.
A dew-preventing, moisture-permeable, waterproof coating fabric of the present invention having a dry resin coating amount of 1.5 g / m ² (referred to as Example 5) was obtained.

Formulation 4 Heimlen Y237 100 parts (Dainichi Seika Kogyo Co., Ltd., ether type polyurethane resin) Methyl ethyl ketone 62 parts

For comparison with the present invention, the moisture-permeable waterproof coated fabric of Comparative Example 6 was used, and on the coated surface,
Dry coating was performed in exactly the same manner as in Example 5 to obtain a comparative moisture-permeable waterproof coating fabric. (Comparative Example 10)

For comparison with the present invention, the moisture-permeable waterproof coating fabric of Comparative Example 8 was used and dry-coated on the coated surface in the same manner as in Example 5 to obtain a comparative moisture-permeable waterproof coating. A woven fabric was obtained. (Comparative Example 11) The performances of the present invention and the coated fabric for comparison were measured, and the results are shown in Table 5.

[0066]

[Table 5]

As is apparent from Table 5, the moisture-permeable waterproof coating fabric of the present invention has excellent water pressure resistance and moisture permeability, and also has good dew condensation preventing properties.

Example 6 Using exactly the same fabric as in Example 4, Nipsil VN3 of Formula 3 in Example 4 was replaced with AEROSIL 200
(Nippon Aerosil Co., Ltd., average particle size is about 0.016μ
m, a hydrophilic silicon dioxide fine powder having a silanol group on the particle surface) was obtained in exactly the same manner as in Example 4 to obtain a moisture-permeable and moisture-permeable waterproof coated fabric of the present invention. (Example 6)

For comparison with the present invention, the AE of Example 6 was used.
Nipsil E150K instead of ROSIL 200
(Nippon Silica Industry Co., Ltd., water-containing hydrophilic silicon dioxide fine powder having a maximum particle size of 12 μm)
In the same manner as in Example 6, a comparative moisture-permeable waterproof coating fabric (Comparative Example 12) was obtained.

For comparison with the present invention, the AE of Example 6 was used.
Crystallite UX-X instead of ROSIL 200
(Manufactured by Shiraishi Calcium Co., Ltd., having an average particle size of 1.8 μm,
A moisture-permeable waterproof coating fabric for comparison (Comparative Example 13) was prepared in exactly the same manner as in Example 6, except that the amount of N, N-dimethylformamide adsorbed was 60 ml / 100 g of hydrophobic silicon dioxide fine powder). I got The performances of the present invention and the comparative coated fabric were measured, and the results are shown in Table 6.

[0071]

[Table 6]

As is evident from Table 6, the dew condensation-preventive moisture-permeable waterproof coating fabric of the present invention has excellent water pressure resistance and moisture permeability, and also has good dew-condensation prevention properties. .

[0073]

According to the present invention, it is possible to impart an unprecedentedly high moisture permeability and dew condensation preventing property while having a high degree of waterproofness, so that the feeling of stuffiness is reduced and the comfort is improved. Thus, it is possible to obtain a dew condensation preventing moisture permeable waterproof coating fabric.

Claims (3)

[Claims] 1. A synthetic polymer A mainly composed of a polyurethane resin,
And adsorption of N, N-dimethylformamide having an average particle size of 0.1 μm or less and a mixed resin solution comprising a synthetic polymer A mainly composed of a polyurethane resin and a synthetic polymer B mainly composed of a polyurethane resin having a different coagulation value. Hydrophobic silicon dioxide fine powder having an amount of 300 ml / 100 g or more
30% by mass and 1 to 10% by mass of a hydrophilic inorganic fine powder having a maximum particle size of 10 μm or less, applied to a fiber cloth, and subjected to wet film formation, characterized by a water pressure of 6
0-200kPa, moisture permeability 8000-12000g / m ²・
A method for producing a 24 hrs dew-preventive moisture-permeable waterproof coating fabric. 2. A synthetic polymer A mainly composed of a polyurethane resin,
And adsorption of N, N-dimethylformamide having an average particle size of 0.1 μm or less and a mixed resin solution comprising a synthetic polymer A mainly composed of a polyurethane resin and a synthetic polymer B mainly composed of a polyurethane resin having a different coagulation value. Hydrophobic silicon dioxide fine powder having an amount of 300 ml / 100 g or more
30% by mass, and 1 to 10% by mass of an inorganic fine powder having hydrophilicity with a maximum particle size of 10 μm or less, coated on a fiber cloth, and subjected to wet film formation, and thereafter, with a maximum particle size of 10 μm or less A water resistant pressure of 150, characterized by applying a synthetic polymer C mainly composed of a polyurethane resin containing 0 to 10% by mass of an inorganic fine powder having hydrophilicity to form a dry film.
~800kPa, moisture permeability 5000~9000g / m ² · 24
A method for producing a moisture-permeable, moisture-proof, waterproof-coated fabric of hrs. 3. The method according to claim 1, wherein the hydrophilic inorganic fine powder is a silicon dioxide-based fine powder.