JP7177650B2 - Waterproof fabric and waterproof sheet manufactured using the waterproof fabric - Google Patents

Description

TECHNICAL FIELD The present invention relates to a waterproof fabric in which a waterproof layer having waterproof properties is laminated on a fiber fabric layer, and a waterproof sheet manufactured using the waterproof fabric.

BACKGROUND ART Conventionally, waterproof textile fabrics are known (see Patent Document 1, for example). BACKGROUND OF THE INVENTION Waterproof textile fabrics are used in various fields such as clothing fields such as outdoor wear and raincoats, and material fields such as umbrellas, sheets for nursing care, and mattress covers.

Especially in the medical and nursing care fields, waterproof sheets are widely known that prevent contamination with body fluids such as food, excrement, and other body fluids such as sweat and saliva, and can maintain cleanliness by wiping with a rag or tissue paper. , see Patent Document 2).

BACKGROUND ART In order to impart waterproofness to a textile fabric, a method of laminating a waterproof layer on the fabric is known. The waterproof layer is a laminate obtained by directly forming a film on the fabric or bonding it with an adhesive, such as a soft resin film, which has flexibility that does not hinder the flexibility of the fabric. widely used in modalities.

However, when simple hydrophobic membranes are layered, the waterproof membrane does not absorb water well, making it difficult to wipe off and cleaning. When wiping, water droplets roll on the hydrophobic membrane, spilling over the edge of the sheet and staining unrelated areas.

In addition, when a film such as highly hydrophilic polyurethane resin or porous polytetrafluoroethylene (PTFE), which is widely used in the clothing field, is laminated, water permeates the film and swells, or permeates the film. There is a problem that the waterproof membrane is not useful because the moisture reaches the fabric layer.

JP-A-2-154070 JP-A-11-309183

The present invention is intended to solve the above-mentioned problems, and while having improved waterproofness, the membrane surface has good water compatibility, so wiping is easy and water droplets do not roll and leak. It is an object of the present invention to provide a waterproof fabric capable of reducing or preventing , and a waterproof sheet manufactured using the waterproof fabric.

As a result of intensive studies to solve the above problems, the present inventors have found that a hydrophobic waterproof layer is laminated with a fabric, and a layer containing a surfactant is provided on the entire surface or part of the waterproof layer. As a result, the inventors have found that the function of facilitating wiping and preventing water droplets from rolling and leaking while having reliable waterproofness is exhibited, and have completed the present invention.

That is, the waterproof fabric according to the present invention has at least a fabric layer and a waterproof layer laminated, and a layer containing a surfactant is provided on the entire surface or a part of the waterproof layer, and further It is characterized by a water pressure resistance of 500 mmH ₂ O or more and a moisture permeability of less than 3000 g/m ² /24 hr based on JIS L1099:2012 B-1.

Moreover, it is preferable that the fabric layer is a knitted fabric.

Moreover, it is preferable that the waterproof layer is made of a resin having flexibility such that the waterproof fabric is not broken, cracked, or whitened even when the waterproof fabric is stretched by 20%. Specifically, a resin layer containing polyurethane resin as a main component can be used. In the present invention, "a resin layer containing a polyurethane resin as a main component" means that the polyurethane resin is contained in a mass ratio of more than 50%, 60% or more, 70% or more, 80% or more, 90% or more, or 100%. It means a resin layer that

Further, the initial contact angle of water with respect to the surface of the layer containing the surfactant is preferably less than 125 degrees. In the present invention, the "initial contact angle of water" refers to the contact angle of water with respect to the surface of the surfactant-containing layer of the waterproof fabric at the initial stage, which has not been subjected to treatment such as washing.

It is preferable that the surfactant-containing layer contains 15% to 55% by mass of the surfactant, and more preferably an anionic surfactant.

Moreover, it is preferable that a cross-linking agent is added to the layer containing the surfactant, and it is more preferable that the cross-linking agent is a polyfunctional isocyanate having more than two cross-linking groups. In the present invention, "polyfunctional isocyanate having more than 2 cross-linking groups" means not only tri-functional isocyanate, but also, for example, when bi-functional isocyanate and tri-functional isocyanate are used in combination, the apparent cross-linking agent as a whole Also included are polyfunctional isocyanates in which the number of cross-linking groups is a non-integer value between 2 and 3.

Further, a textile product according to the present invention is a textile product at least partially using any one of the waterproof fabrics described above, and is used as a waterproof sheet.

In the waterproof fabric according to the present invention, hydrophilicity is imparted to the outermost surface of the waterproof membrane. For this reason, it has reliable waterproofness, and at the same time, it has a function of facilitating wiping and preventing water droplets from rolling and leaking. Therefore, the waterproof fabric according to the present invention can provide a waterproof sheet that has reliable waterproofness, facilitates wiping, and prevents water droplets from rolling and leaking.

<Waterproof fabric>
In the waterproof fabric according to the present embodiment, at least a fabric layer and a waterproof layer are laminated, and a layer containing a surfactant on the entire surface or a part of the waterproof layer, more specifically, an interface An outermost layer containing an active agent is provided, and has a water pressure resistance of 500 mmH ₂ O or more and a moisture permeability of less than 3000 g/m ² /24 hr according to JIS L1099:2012 B-1.

Useful fiber materials constituting the fabric layer in the present embodiment include polyester, polyamide, acrylic, polyurethane, or rayon such as acetate and viscose. Chemical fibers such as polyamide, polyimide or polyphenylene sulfide, natural fibers such as cotton, hemp, silk or wool, or mixed fibers, mixed spinning, mixed weaves or mixed knitted products of these materials can be used, and are particularly limited not a thing

Further, the fibers constituting the fabric layer may be either long fibers or short fibers. Moreover, the yarn using this fiber may be raw silk, twisted yarn, or textured yarn. The textured yarn is also not particularly limited, and false twisted yarn (woolly textured yarn, DTY, improved false twisted textured yarn, etc.), pressed textured yarn, shaped textured yarn, rubbed textured yarn, Taslan textured yarn, yarn It is possible to use lengthwise aligned yarn, composite textured yarn, fluffed yarn, entangled bundled yarn, entangled blended yarn, and the like.

Also, the cross-sectional shape of the fiber is not particularly limited, and examples thereof include round, triangular, star-shaped, flat, C-shaped, hollow, I-shaped, dogbone, and the like.

In addition, the fabric layer made of these materials may be in any form such as woven fabric, non-woven fabric, or knitted fabric. Since it is excellent in elasticity, it is preferable to use a knitted fabric that easily imparts stretchability to the fabric.

Also, the fabric layer may or may not be colored in advance. When coloring the fabric layer in advance, disperse dyes, cationic dyes, acid dyes, direct dyes, reactive dyes, vat dyes, or dyes such as sulfur dyes, or fluorescent brighteners, pigments, etc. can be tinted. The material used for coloring the fabric layer is not particularly limited, and an appropriate material may be selected according to the material of the fabric layer.

Moreover, the coloring method includes methods such as original dyeing, dip dyeing, and textile printing, and is not particularly limited.

In addition, the fabric layer may be subjected to flame-retardant, antistatic, antibacterial and deodorizing, antibacterial, ultraviolet-shielding, light-resistant, water-repellent, or the like.

The material laminated on the fabric layer and used as the waterproof layer has a water pressure resistance of 500 mmH ₂ O or more and a moisture permeability of less than 3000 g/m ² /24 hr based on JIS L1099:2012 B-1 method. It is not particularly limited as long as it becomes.

Specifically, metal foils such as aluminum and gold, oxides such as silicon and titanium, silicone resins such as polydimethylsiloxane, polyolefins such as polyethylene, polyhalogenated olefins such as polyvinyl chloride, and polybutadiene. and other rubbers, cellophane, polyacrylic acid esters, polymethacrylic acid esters, polyesters such as polyethylene terephthalate (PET), polyamides, and polyurethane resins.

The water pressure resistance of the waterproof fabric is preferably 500 _mmH2O or more, more preferably 1000 _mmH2O or more, and most preferably 2000 _mmH2O or more. If the water pressure resistance of the waterproof fabric is less than 500 mmH ₂ O, the original role of the waterproof layer cannot be sufficiently fulfilled, and there is a risk that the covered article will get wet. Although the upper limit of water pressure resistance is not particularly limited, it may be, for example, 100000 mmH2O or less, 80000 _mmH2O or less, 50000 _mmH2O or less, or _{20000 mmH2O} or less.

The moisture permeability of the waterproof fabric based on JIS L1099:2012 B-1 method is preferably less than 3000 g/m ² /24 hr, more preferably less than 2500 g/m ² /24 hr, most preferably less than 2000 g/m ² /24 hr. If the moisture permeability is 3000 g/m ² /24 hr or more, there is a possibility that water will permeate the membrane and cause swelling. The lower limit of moisture permeability is not particularly limited, but is, for example, 10 g/m ² /24 hr or more, 30 g/m ² /24 hr or more, 50 g/m ² /24 hr or more, or 100 g/m ² /24 hr or more. may

In general, if a waterproof sheet has elasticity, it is comfortable during use and excellent in workability during replacement. It is preferably made of a flexible resin that does not cause cracks. In particular, it is more preferable to use a polyurethane resin as a main component for the waterproof layer from the viewpoints of high adaptability to expansion and contraction of the waterproof fabric, resistance to plastic deformation, and ease of production.

As a method for laminating the fabric layer and the waterproof layer, a general coating machine such as a die coater, a lip coater, a slit coater, a knife coater, a gravure coater, etc. is used to directly apply the resin onto the fabric layer. A method of drying or solidifying, a method of depositing a material on a fabric layer such as vacuum deposition, sputtering, or CVD, or applying an adhesive to the entire surface or part of a pre-formed film by stretching, extrusion, casting, skiving, inflation, etc. However, there is a method such as lamination in which the fabric layer is adhered via an adhesive, and the method is not particularly limited.

If the contact angle of water with respect to the surface of the surface-active agent-containing layer is small, the water compatibility of the waterproof film is improved, so wiping is facilitated, and the function of preventing water droplets from rolling and leaking is strongly expressed. . Specifically, when the contact angle of water with respect to the surface of the surfactant-containing layer is more than 135 degrees, sufficient water compatibility may not be obtained. Therefore, the contact angle of water, particularly the initial contact angle of water, with respect to the surface of the surfactant-containing layer is preferably 135 degrees or less, more preferably less than 125 degrees, and less than 100 degrees. is most preferred. According to the waterproof fabric according to the present embodiment, the contact angle of water with respect to the surface of the layer containing the surfactant is 135 degrees or less, preferably even after 20 washing treatments according to the JIS L0217:1995 103 method. can be maintained at 130 degrees or less, more preferably 120 degrees or less, and thus it is possible to achieve good water compatibility over a longer period of time, which in turn makes it easier to wipe clean and remove water droplets over a longer period of time. It becomes possible to achieve rolling leakage prevention. In the present invention, "20 times of washing treatment according to JIS L0217: 1995 103 method" means 5 times of washing treatment with 25 minutes of washing time and 10 minutes of rinsing time per time. , and this operation is repeated four times, and then, finally, it is dried once by hanging.

The surfactant-containing layer preferably contains 10% to 65% by mass of the surfactant, more preferably 15% to 55%, and even more preferably 20% to 50%. , 25% to 45% are most preferred. If the mass ratio of the surfactant is less than 10%, the effect of reducing the contact angle of water with respect to the surface of the layer containing the surfactant is weak, facilitating wiping and preventing water droplets from rolling and leaking. Functions may not be fully expressed. When the mass ratio of the surfactant is high, the skin may feel sticky when it comes in contact with the skin, or the layer may fall off during use due to the weak mechanical strength of the layer, making it impossible to exhibit its effects. In order to reliably prevent such stickiness and detachment of the layer, the mass ratio of the surfactant is preferably 55% or less.

Surfactants include anionic surfactants such as sodium di-2-ethylhexylsulfosuccinate and carboxylates, cationic surfactants such as quaternary ammonium salts, and amphoteric surfactants such as betaine types. Active agents include nonionic surfactants such as polyoxyalkylene glycols and alcohol ethoxylates containing oxyethylene groups, oxypropylene groups, or combinations thereof. In particular, when an anionic surfactant is used, the effect of reducing the contact angle of water with respect to the surface of the layer containing the surfactant is high, and the water compatibility of the waterproof membrane is improved, which facilitates wiping and cleaning. It is preferable because the function of preventing water droplets from rolling and leaking can be strongly exhibited.

As a method of providing a layer containing a surfactant on the entire surface or part of the waterproof layer, a coating liquid in which a surfactant is mixed or dispersed in an appropriately selected base resin such as polyurethane resin or polyacrylic acid ester. Using a general coating machine such as a die coater, lip coater, slit coater, knife coater, gravure coater, directly on the entire or part of the waterproof layer laminated on the fabric layer, or before lamination There are methods such as applying to a film and drying or solidifying, and there is no particular limitation.

In addition, the cross-linking agent forms a chemical bond between the surfactant and the waterproof layer, and between the surfactant and the base resin of the layer containing the surfactant, so that the outflow of the surfactant due to wiping with water, washing, etc. It is preferable that a cross-linking agent is added to the layer containing the surfactant, since the effect of preventing this is obtained.

The cross-linking agent is not particularly limited. An appropriate selection is made depending on compatibility with the base resin of the active agent, the waterproof layer, and the layer containing the surfactant. In particular, it is preferred to use polyfunctional isocyanates having more than two cross-linking groups, such as trifunctional isocyanates. A polyfunctional isocyanate having more than 2 cross-linking groups can form a three-dimensional network structure without impairing the flexibility of a polyurethane resin that is suitably used for a waterproof layer. It is highly effective in preventing the outflow of the agent.

In the waterproof fabric according to one embodiment of the present invention described above, at least a fabric layer and a waterproof layer are laminated, and a layer containing a surfactant is provided on the entire surface or a part of the waterproof layer. Furthermore, since it has a water pressure resistance of 500 mmH ₂ O or more and a moisture permeability of less than 3000 g/m ² /24 hr based on JIS L1099:2012 B-1, it has reliable waterproofness, It has the function of facilitating wiping and preventing water droplets from rolling and leaking.

<waterproof sheets>
The waterproof sheet in the present embodiment uses at least a part of the waterproof fabric, and is, for example, a futon for nursing care or a mattress.

Since the waterproof sheet in the present embodiment uses the waterproof fabric, it has a reliable waterproof property, and at the same time, it is a waterproof sheet that has a function of facilitating wiping and preventing water droplets from rolling and leaking. .

Examples of the waterproof fabric according to the present embodiment will be described below, but the present invention is not limited to these examples. The following methods were used to measure and evaluate various physical properties in each evaluation item A to I in the following examples and comparative examples. Also, "%" and "parts" in the examples and comparative examples are "% by mass" and "parts by mass".
[A: moisture permeability]
Moisture permeability was measured according to JIS L1099:2012 B-1 method (potassium acetate method). However, the display was converted to 24 hours.
[B: Water pressure resistance]
The water pressure resistance was measured by JIS L1092:2009 water resistance test (hydrostatic pressure method) A method (low water pressure method).
[C: water contact angle]
The contact angle of water with respect to the surface of the surfactant-containing layer was measured by FACE CA-D manufactured by Kyowa Interface Science Co., Ltd. both at the initial stage and after the following D washing treatment. The water used for the measurement is ion-exchanged water with a pH of 6 to 8 and a temperature of 25°C.
[D: Washing treatment]
Washing treatment was performed 20 times according to JIS L0217:1995 103 method. The washing time was 25 minutes and the rinsing time was 10 minutes per wash, which was treated as 5 times of washing treatment. Drying was carried out once by hanging after washing 20 times.

[E: Leakage]
Waterproofness is evaluated from the viewpoint of water leakage. Specifically, 2 g of water is dropped on the waterproof membrane surface of a 10 cm square sample, and after applying force to push it into the membrane surface and spreading it, water leakage from the back side is checked. It was evaluated by confirming the presence or absence.
[F: water swelling]
Waterproofness was also evaluated from the viewpoint of water swelling. Specifically, 2 g of water was dropped onto the waterproof film surface of a 10 cm square sample, spread it, and was left to stand for 5 minutes. .
[G: water familiarity]
For water compatibility, 2 g of water is dropped on the surface of the waterproof membrane of a 10 cm square sample, spread over it, and then wiped off with a dry cloth. was evaluated both at the initial stage and after the washing treatment of D above. Evaluations of 2 to 4 out of the following 4 grades were regarded as pass.
1: Hard to wipe off 2: Easy to wipe off 3: Fairly easy to wipe off 4: Very easy to wipe off [H: Elastic followability]
Stretch followability was measured by holding a strip-shaped test piece with a width of 25 mm at a distance between chucks of 100 mm, stretching it 20% to 120 mm with a tensile tester, and returning it to 100 mm. Presence or absence of cracks, whitening, etc.).
[I: Stickiness of film surface]
The surface of the waterproof membrane was touched with a hand to confirm the stickiness of the membrane surface.

(Example 1)
<Fabric layer using woven fabric>
A fabric using polyester fibers (thread usage: 84 decitex/72 filaments, density: warp 106/inch, weft 86/inch plain fabric) was dyed green with a disperse dye and heat set.

<Lamination of waterproof layer with PET film>
Next, using a gravure coater, a moisture-curing hot-melt type urethane resin adhesive Tyforce NH-321 (manufactured by DIC Corporation) is heated to 110° C. and melted, and the surface of the PET film having a thickness of 38 μm is dotted. Granted.
Next, the woven fabric using the polyester fiber was superposed on the surface of the PET film to which the adhesive was applied, and was thermocompression bonded at 100° C. using nip rolls. After thermocompression bonding, aging was performed at 70° C. for 72 hours to obtain a waterproof fabric in which the woven fabric using the polyester fiber and the PET film were laminated.

<Providing a layer containing a surfactant>
Next, polyurethane resin paint Luxkin U956 (manufactured by Seiko Kasei Co., Ltd., solid content concentration: 18%) 100 parts, polyoxyalkylene glycol Newpol 80-4000 (manufactured by Sanyo Chemical Industries Co., Ltd.), which is a nonionic surfactant , Single product) 2 parts were prepared and stirred, and the entire surface of the PET film laminated with the fabric using polyester fiber was coated with a gravure coater, and then dried with hot air at 120 ° C. A waterproof fabric having a layer containing a surfactant on the surface of the waterproof layer was obtained. Table 1 shows the performance of the resulting waterproof fabric.

(Comparative example 1)
A waterproof fabric was obtained by the method described in Example 1, except that the step of applying a layer containing a surfactant to the surface of the waterproof layer was omitted. Table 1 shows the performance of the resulting waterproof fabric.

(Comparative example 2)
<Lamination of waterproof layer with polyurethane resin film with high moisture permeability>
A solution of a polyurethane resin Crisbon S-525CAT (manufactured by DIC Corporation) diluted with an organic solvent was applied onto release paper and dried to form a highly moisture-permeable polyurethane resin film having a thickness of 20 μm.
Next, 100 parts of polyurethane resin Crisbon TA-170 (manufactured by DIC Corporation), 12 parts of polyisocyanate solution Coronate L (manufactured by Tosoh Corporation), and 0.2 parts of N-methyldiethanolamine were prepared, diluted with an organic solvent and stirred. After the solvent was applied onto a film formed on release paper, it was dried with hot air at 90° C. to give an adhesive layer to the film.
Next, the fabric using the polyester fiber described in Example 1 was overlaid on the adhesive layer of the film and thermocompression bonded at 120° C. using nip rolls. After thermocompression bonding, the release paper was peeled off after aging at 60° C. for 24 hours to obtain a waterproof fabric in which the fabric using the polyester fiber and the polyurethane resin film having high moisture permeability were laminated.

Next, a layer containing a surfactant is applied to the surface of the waterproof layer by the method described in Example 1, a highly moisture-permeable waterproof layer is laminated, and a layer containing a surfactant on the surface of the waterproof layer. A waterproof fabric having Table 1 shows the performance of the resulting waterproof fabric.

(Comparative Example 3)
<Lamination of waterproof layer with low water pressure resistance>
A solution of the polyurethane resin Crisbon NY-393 (manufactured by DIC Corporation) diluted with an organic solvent is applied to one side of the fabric using the polyester fiber described in Example 1 by floating using a knife coater, and then dried to obtain polyester. A waterproof fabric was obtained in which the fabric using the fiber and the polyurethane resin layer with low water pressure resistance were laminated.

Next, a layer containing a surfactant is applied to the surface of the waterproof layer by the method described in Example 1, a waterproof layer with low water pressure resistance is laminated, and a layer containing a surfactant is laminated on the surface of the waterproof layer. A waterproof fabric having Table 1 shows the performance of the resulting waterproof fabric.

(Example 2)
<Fabric layer using knitted fabric>
A knitted fabric using polyamide fibers (yarn used: 78 decitex/24 filaments, density: half tricot of 40 courses/inch, 28 wales/inch) was dyed green with an acid dye and heat set.

Next, a waterproof fabric was obtained by the method described in Example 1, except that a knitted fabric using polyamide fibers was used for the fabric layer. The performance of the obtained waterproof fabric is described in Table 2.

(Example 3)
<Lamination of waterproof layer using polyurethane resin film with low moisture permeability>
A solution of a polyurethane resin Crisbon NY-393 (manufactured by DIC Corporation) diluted with an organic solvent was applied onto release paper and dried to form a polyurethane resin film having a thickness of 20 μm.
Next, 100 parts of polyurethane resin Crisbon TA-465 (manufactured by DIC Corporation), 12 parts of polyisocyanate solution Coronate L (manufactured by Tosoh Corporation), and 0.2 parts of N-methyldiethanolamine were prepared, diluted with an organic solvent and stirred. After the solvent was applied onto a film formed on release paper, it was dried with hot air at 90° C. to give an adhesive layer to the film.
Next, the knitted fabric using the polyamide fiber described in Example 2 was overlaid on the adhesive layer of the film and thermocompression bonded at 120° C. using nip rolls. After thermocompression bonding, the release paper is peeled off after aging at 60° C. for 24 hours to obtain a waterproof fabric in which a knitted fabric using polyamide fibers and a polyurethane resin film (containing 100% by mass of polyurethane resin) are laminated. rice field.

Next, a layer containing a surfactant is applied to the surface of the waterproof layer by the method described in Example 1, a waterproof layer with low moisture permeability is laminated, and a layer containing a surfactant on the surface of the waterproof layer. A waterproof fabric having The performance of the obtained waterproof fabric is described in Table 2.

(Example 4)
A waterproof fabric was obtained by the method described in Example 3, except that 4 parts of the polyoxyalkylene glycol was added in the step of applying the surfactant-containing layer to the surface of the waterproof layer. The performance of the obtained waterproof fabric is described in Table 2.

(Example 5)
A waterproof fabric was obtained by the method described in Example 3, except that 30 parts of the polyoxyalkylene glycol was added in the step of applying the surfactant-containing layer to the surface of the waterproof layer. The performance of the obtained waterproof fabric is described in Table 2.

(Example 6)
A waterproof fabric was obtained by the method described in Example 3, except that 10 parts of the polyoxyalkylene glycol was added in the step of applying the surfactant-containing layer to the surface of the waterproof layer. The performance of the obtained waterproof fabric is described in Table 2.

(Example 7)
A waterproof fabric was obtained by the method described in Example 3, except that 20 parts of the polyoxyalkylene glycol was added in the step of applying the surfactant-containing layer to the surface of the waterproof layer. The performance of the obtained waterproof fabric is described in Table 2.

(Example 8)
In the step of applying a layer containing a surfactant to the surface of the waterproof layer, instead of polyoxyalkylene glycol, an anionic surfactant di-2-ethylhexyl sodium sulfosuccinate solution Pelex OT-P (Kao Corporation A waterproof fabric was obtained by the method described in Example 3, except that 10 parts of non-volatile component concentration: 86% (manufactured by the company) was added. The performance of the obtained waterproof fabric is described in Table 2.

(Example 9)
In the step of applying a layer containing a surfactant to the surface of the waterproof layer, trifunctional isocyanate solution Coronate L (manufactured by Tosoh Corporation, non-volatile component concentration: 75%) was added, except that 8 parts were added. Described in Example 3. A waterproof fabric was obtained by the method. The performance of the obtained waterproof fabric is described in Table 2.

Referring to Tables 1 and 2, in the waterproof fabric of Comparative Example 1, which did not have a layer containing a surfactant on the surface of the waterproof layer, the contact angle of water was high both at the initial stage and after the washing treatment, and therefore As a result, it was not easy to wipe clean, and water droplets rolled and leaked. In Comparative Example 2, since the moisture permeability of the waterproof fabric was high, moisture permeated the waterproof fabric and swelling occurred, and as a result, sufficient waterproofness could not be obtained. In Comparative Example 3, water leakage occurred due to the low water pressure resistance of the waterproof fabric, and as a result, sufficient waterproofness was not obtained.

In contrast, in the waterproof fabrics of all the examples according to the present invention, a layer containing a surfactant is provided on the surface of the waterproof layer, and the water pressure resistance and moisture permeability of the waterproof fabric are reduced to a predetermined range. By controlling the inner diameter, it was possible to have high waterproofness from the viewpoint of both water leakage and water swelling, and to improve water compatibility. As a result, it was possible to wipe and clean easily, and it was possible to prevent the occurrence of rolling leakage of water droplets. In particular, in the waterproof fabric of Example 2 in which the waterproof layer was made of polyethylene terephthalate (PET) film, whitening occurred when the waterproof fabric was stretched by 20%, but the waterproof layer was made of polyurethane resin. In the waterproof fabrics of Examples 1 and 2, there was no particular change in appearance even after such elongation, and no tearing, cracking, whitening, or the like occurred. In addition, in the waterproof fabrics of Examples 4 and 6 to 9 in which the surfactant concentration in the layer containing the surfactant was controlled within the range of 15% to 55%, the initial contact angle of water was less than 125 degrees. values, resulting in higher water compatibility. In addition, the waterproof fabric of Example 9, in which an anionic surfactant was used and a trifunctional isocyanate was added as a cross-linking agent to the layer containing the surfactant, the contact angle of water could be reduced to values below 125 degrees and significantly higher water compatibility could be achieved.

Each waterproof fabric obtained as described above has a layer containing a surfactant on the outermost surface of the hydrophobic waterproof membrane, so it has reliable waterproofness and can be easily wiped clean. It is possible to provide a waterproof fabric that prevents water droplets from rolling and leaking, and a waterproof sheet manufactured using the waterproof fabric.

Claims (10)

At least a fabric layer and a waterproof layer are laminated, and a layer containing a surfactant is provided on the entire surface or part of the surface of the waterproof layer, and the surface of the layer containing the surfactant is treated with water. An initial contact angle of 135 degrees or less, a water pressure resistance of 500 mmH ₂ O or more, and a moisture permeability of less than 3000 g/m ² /24 hr based on JIS L1099:2012 B-1 method. fabric. 2. The waterproof fabric of Claim 1, wherein said fabric layer is a knitted fabric. 3. The waterproof property according to claim 1 or 2, wherein the waterproof layer is made of a flexible resin that does not tear, crack, or whiten even when the waterproof fabric is stretched by 20%. fabric. The waterproof fabric according to any one of claims 1 to 3, wherein the waterproof layer is a resin layer containing polyurethane resin as a main component. The waterproof fabric according to any one of claims 1 to 4, wherein the initial contact angle of water with respect to the surface of the layer containing the surfactant is less than 125 degrees. The waterproof property according to any one of claims 1 to 5, wherein the surfactant-containing layer contains 15% to 55% by mass of the surfactant. fabric. The waterproof fabric according to any one of claims 1 to 6, wherein the surfactant is anionic. The waterproof fabric according to any one of claims 1 to 7, wherein a cross-linking agent is added to the layer containing the surfactant. The waterproof fabric according to any one of claims 1 to 8, wherein the cross-linking agent is a polyfunctional isocyanate having more than two cross-linking groups. A waterproof sheet manufactured using the waterproof fabric according to any one of claims 1 to 9.