JP2017155371A - Moisture permeable waterproof fabric and moisture permeable waterproof cloth - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a moisture permeable waterproof fabric and a moisture permeable waterproof cloth by suppressing reduction of water repellency/alcohol repellency or permeation resistance even to an ethanol antiseptic solution.SOLUTION: There is provided a moisture permeable waterproof fabric having a laminate structure of a polyolefin fine porous film and a water repellent and oil repellent unwoven cloth and permeation resistance to a 80% ethanol solution (JIS T 8030A method) of class 1 or more, the water repellent and oil repellent unwoven cloth is arranged on one surface, water pressure resistance of the water repellent and oil repellent unwoven cloth is 300 mmHO or more and water repellency/alcohol repellency is 5 or more.SELECTED DRAWING: None

Description

  The present invention relates to a waterproof and moisture-permeable fabric and a waterproof and moisture-permeable clothing.

  Conventionally, raincoats, such as raincoats, are easy to process and raincoats using water-resistant but not moisture-permeable rubber-coated cloth, polyvinyl chloride, or the like are often used. However, rain gear made of rubberized cloth or polyvinyl chloride has a thick barrier layer in order to maintain high barrier properties, or uses a non-porous barrier layer that is not permeable to moisture. It has a deficiency that it is damp and has a strong feeling of stuffiness when worn, and poor comfort due to poor flexibility.

  Therefore, recently, as a material having both water pressure resistance and moisture permeability, waterproof moisture permeable clothing such as a raincoat using a microporous polyolefin film filled with an inorganic filler such as calcium carbonate as a waterproof moisture permeable fabric has been developed. The feeling of stuffiness is reduced and the comfort of clothing is improved.

  However, microporous films filled with inorganic fillers are known to have weaknesses such as tensile strength and puncture strength, and are filled with ultrahigh molecular weight polyolefin instead of inorganic fillers in order to eliminate the above disadvantages. A waterproof moisture-permeable garment using a microporous polyolefin film used as an agent as a waterproof moisture-permeable fabric is known (Patent Document 1).

JP 2003-328219 A

However, the microporous polyolefin film using ultra-high molecular weight polyolefin as the filler described above achieves a water pressure resistance of 2000 mmH ₂ O or more, but is water repellent with respect to an ethanol disinfectant (80% ethanol aqueous solution). / We found a problem that the alcohol repellency and permeation resistance were not sufficient.

  Therefore, an object of the present invention is to provide a waterproof and moisture permeable cloth and a waterproof and moisture permeable clothing excellent in water repellency / alcohol repellency and permeation resistance with respect to an ethanol disinfectant.

In order to solve the above problems, the present invention takes the following means.
(1) It has a laminated structure of a polyolefin microporous film and a water / oil repellent nonwoven fabric, and has a permeation resistance to 80% aqueous ethanol (JIS T 8030A method) of class 1 or higher. A waterproof / moisture permeable fabric that is disposed on at least one surface, wherein the water / oil repellent nonwoven fabric has a water pressure resistance of 300 mmH ₂ O or more and a water / alcohol repellency of 5 or more.
(2) The water permeability of the polyolefin microporous film is 200 g / m ² · h or more, the tensile strength of the polyolefin microporous film is 20 N / 5 cm or more, and the water resistance of the polyolefin microporous film is The waterproof / moisture permeable fabric according to (1), which is at least 5000 mmH ₂ O.
(3) A waterproof / breathable garment using the waterproof / breathable fabric of (1) or (2).

  ADVANTAGE OF THE INVENTION According to this invention, the waterproof moisture-permeable cloth and waterproof moisture-permeable clothes excellent in the water repellency / alcohol repellency with respect to ethanol disinfection liquid, and permeation resistance can be provided.

<Polyolefin microporous film>
The polyolefin microporous film of the present invention is a film having a large number of fine through holes that penetrate both surfaces of the film and have air permeability. As a method for forming a through-hole in a polyolefin microporous film, either a wet method or a dry method may be used as long as strength such as puncture strength and tensile strength, moisture permeability, and barrier properties can be ensured. A wet method is preferred because foreign substances can be washed away with a solution.

  The wet method is a method of forming voids using a solvent. Specifically, a polyolefin resin is used as a matrix resin, and an extract to be extracted after being formed into a sheet is added, mixed, formed into a sheet, and extracted using a good solvent for the extract before or after biaxial stretching. A method of generating voids in the matrix resin by extracting only the above can be mentioned.

  The polyolefin microporous film may be composed only of polyolefin, or may contain an antioxidant or the like as long as the effects of the present invention are not impaired.

  The polyolefin forming the polyolefin polyolefin microporous film includes an antioxidant, a heat stabilizer, a light stabilizer, a neutralizer, an antistatic agent and a lubricant composed of organic particles, as long as the effects of the present invention are not impaired. May contain various additives such as anti-blocking agents, fillers, and incompatible polymers.

The polyolefin microporous film preferably has a moisture permeability lower limit of 200 g / m ² · h or more, which is a moisture permeability evaluation scale. On the other hand, the upper limit is preferably 2000 g / m ² · h or less. When the moisture permeability of the polyolefin microporous film is 200 g / m ² · h or more, the moisture permeability becomes excellent, and the waterproof moisture-permeable fabric using the polyolefin microporous film is used as a waterproof moisture-permeable clothing. At the same time, the wearing comfort of the waterproof breathable garment is improved. From the above viewpoint, the lower limit of moisture permeability of the polyolefin microporous film is more preferably 200 g / m ² · h or more, and further preferably 300 g / m ² · h or more. On the other hand, when the moisture permeability of the polyolefin microporous film is 2000 g / m ² · h or less, the barrier property is more excellent. The moisture permeability is evaluated by the A-1 method described in JIS L 1099: 2012. Further, as an example, the means for setting the moisture permeability of the polyolefin microporous film in the above range is that the content of the ultrahigh molecular weight polyolefin having a mass average value of 1 × 10 ⁶ or more contained in the polyolefin is 1 with respect to the whole polyolefin. -15 mass% etc. are mentioned.

  The polyolefin microporous film preferably has a tensile strength calculated based on JIS L 1096 of 20 N / 5 cm or more in the vertical direction and the horizontal direction, more preferably 30 N / 5 cm or more, and even more preferably 40 N / 5 cm or more. It is. By setting the tensile strength of the polyolefin microporous film to 20 N / 5 cm or more, the waterproof moisture-permeable fabric is used as a waterproof moisture-permeable clothing, and when the wearer of the waterproof moisture-permeable clothing performs bending work, the waterproof moisture-permeable fabric Even if force is applied to the film, it is preferable because the polyolefin microporous film is hardly broken. In addition, the upper limit of the tensile strength of the polyolefin microporous film is not particularly limited, but the waterproof / breathable cloth is cut with scissors or the like in an arbitrary shape during sewing when the waterproof / breathable cloth is used as a waterproof / breathable cloth. From the viewpoint, 500 N / 5 cm or less is preferable. Here, the vertical direction refers to the roll-out direction during the production of the polyolefin microporous film. In addition, a horizontal means the direction orthogonal to said length direction.

  The tensile elongation of the polyolefin microporous film is preferably 3% or more in the vertical direction and the horizontal direction, more preferably 5% or more, and the upper limit is preferably 20% or less, more preferably 15% or less. . When the tensile elongation of the microporous film is 20% or less, even when the waterproof breathable cloth is used and the film is stretched when the wearer of the waterproof breathable cloth using the waterproof breathable cloth is working. The expansion of the pore diameter of the microporous film can be suppressed, thereby preventing viruses and bacteria from passing through the microporous film. When the tensile elongation of the microporous film is 3% or more, the microporous film is stretched in accordance with the movement of the body during work, so that the comfort is improved.

  The polyolefin microporous film preferably has a thickness of 10 μm or more, more preferably 15 μm or more, and further preferably 20 μm or more. When the thickness of the polyolefin microporous film is 10 μm or more, excellent puncture strength and tensile strength can be obtained. On the other hand, the upper limit of the thickness of the polyolefin microporous film is not particularly limited, but is preferably 50 μm or less. By setting the thickness of the polyolefin microporous film to 50 μm or less, the moisture permeability of the polyolefin microporous film can be improved.

Polyolefin microporous film is preferably water pressure resistance obtained based on JIS L 1092A method is 5000mmH ₂ 0 or more, more preferably 6000mmH ₂ 0 or more, further preferably 7000mmH ₂ 0 or more . In the evaluation, the evaluation is performed without using a support that suppresses the elongation of the polyolefin microporous film. Further, the water pressure resistance of the polyolefin microporous film can be set within the above range by means such as increasing the thickness of the film or adjusting the draw ratio of the film.

  Polyolefin microporous film is excellent in cost and productivity, has excellent barrier properties, reduces the feeling of stuffiness when wearing a waterproof breathable fabric using a waterproof breathable fabric, and comfort of the waterproof breathable clothing Can be made excellent.

<Water / oil repellent nonwoven fabric>
Next, the water / oil repellent nonwoven fabric will be described. The water / oil repellent nonwoven fabric used in the waterproof / moisture permeable fabric of the present invention provides the waterproof / moisture permeable fabric with a sufficient tensile strength, abrasion strength, water pressure resistance, and appropriate texture and softness. Water- and oil-repellent nonwoven fabrics include wet nonwoven fabrics, resin bond dry nonwoven fabrics, thermal bond dry nonwoven fabrics, spunbond dry nonwoven fabrics, needle punch dry nonwoven fabrics, water jet punch dry nonwoven paper fabrics, melt blown nonwoven fabrics or flash spinning. In addition to the dry-type non-woven fabric, non-woven fabric manufactured by a paper making method capable of making the basis weight and thickness uniform can also be preferably used. Among these, a water / oil repellent nonwoven fabric having a laminated structure of a spunbond dry nonwoven fabric (spunbond layer) and a meltblown nonwoven fabric (meltblown layer) has high water pressure resistance and is preferably used.

  Examples of the material for the water- and oil-repellent nonwoven fabric include polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate and polylactic acid, polycarbonate, polystyrene, polyphenylene sulfite, fluororesin, and mixtures thereof. Among these, polyolefin, particularly polypropylene, is preferable because it has excellent heat resistance and chemical resistance. In addition, when applying a hot melt adhesive to a water / oil repellent nonwoven fabric, from the viewpoint of heat resistance of the water / oil repellent nonwoven fabric, the lower limit of the melting point of the material constituting the water / oil repellent nonwoven fabric is 130 ° C. or more. It is preferably 140 ° C or higher, more preferably 150 ° C or higher. On the other hand, the upper limit of the melting point of the material constituting the water / oil repellent nonwoven fabric is not particularly limited, but is preferably 300 ° C. or lower.

  The tensile strength of the water / oil repellent nonwoven fabric is preferably 5 N / 50 mm or more from the viewpoint of excellent tensile strength of the waterproof and moisture permeable fabric. More preferably, it is 10 N / 50 mm or more, More preferably, it is 15 N / 50 mm or more. On the other hand, the upper limit of the tensile strength is preferably 300 N / 50 mm or less from the viewpoint of ensuring appropriate softness of the waterproof and moisture-permeable fabric.

  The burst strength of the water / oil repellent nonwoven fabric is 300 kPa or more, preferably 400 kPa or more, more preferably 500 kPa or more, from the viewpoint of making the waterproof and moisture permeable fabric excellent in burst strength, while the upper limit of the burst strength is It is preferably 3000 kPa or less. When the burst strength is 3000 kPa or less, the waterproof and moisture-permeable fabric when used as a waterproof and moisture-permeable fabric can have excellent flexibility and light weight.

  The wear strength of the water / oil repellent nonwoven fabric is preferably 3 or more from the viewpoint of improving the wear strength of the waterproof and moisture permeable fabric. More preferably, it is quaternary or higher.

  The lower limit of the thickness of the water / oil repellent nonwoven fabric is preferably 0.01 mm or more, and more preferably 0.1 mm or more. On the other hand, the upper limit of the thickness of the water / oil repellent nonwoven fabric is preferably 5 mm or less, and more preferably 2 mm or less.

Moreover, the lower limit of the basis weight of the water / oil repellent nonwoven fabric is preferably 10 g / m ² or more, and more preferably 20 g / m ² or more. On the other hand, the upper limit of the basis weight is preferably 200 g / m ² or less, and more preferably 100 g / m ² or less.

  The water / oil repellent nonwoven fabric used in the present invention is subjected to water / oil repellent finish. From the viewpoint of preventing a solvent-based liquid such as an 80% aqueous ethanol solution from coming into contact with the microporous polyethylene film, it is important that the water / oil repellency of the water / oil repellent nonwoven fabric is 5 or more, 6 or more is preferable. As a means for setting the water repellency / alcohol repellency of the water / oil repellent nonwoven fabric within the above range, there may be mentioned subjecting the nonwoven fabric of the surface layer to a water / oil repellent finish. Here, existing chemicals such as fluororesin and silicone resin can be used for the water / oil repellent treatment. Examples of the fluororesin include PTFE (tetrafluoroethylene resin), PFA (copolymer of tetrafluoroethylene (TFE) and perfluoroalkoxyethylene) and FEP (perfluoroethylene-propene copolymer). In this case, only the surface opposite to the surface that contacts the microporous film of the water / oil repellent nonwoven fabric is subjected to the water / oil repellent treatment so that the hot melt adhesive and the polyolefin microporous film have good adhesion. It is preferable from a viewpoint that it can be made. This is because the affinity between the surface of the water / oil repellent nonwoven fabric treated with water / oil repellent and the hot melt adhesive is low, and the peel strength of the joint surface between the water / oil repellent nonwoven fabric and the polyolefin microporous film is reduced. This is because it is easy. The water and oil repellent processing may be performed under known processing conditions, but the conditions that the shrinkage of the polyolefin microporous film and the hot melt adhesive deteriorate and the water and oil repellent nonwoven fabric and the polyolefin microporous film do not peel off. It is necessary to do in. The water / oil repellent finish is preferably applied to at least the surface of the water / oil repellent nonwoven fabric, and a dipping method in which the nonwoven fabric is impregnated with a drug is also preferred from the viewpoint of imparting water / oil repellency to the entire nonwoven fabric.

The water pressure resistance of the water / oil repellent nonwoven fabric is 300 mmH ₂ O or more from the viewpoint of preventing the solvent-based liquid from contacting the water / oil repellent nonwoven fabric and penetrating into the microporous polyethylene film when pressure is applied. It is important that 400 mmH ₂ O or more is preferable, and 500 mmH ₂ O or more is more preferable. Use water- and oil-repellent chemicals as a means to achieve water pressure resistance, increase the weight of the water- and oil-repellent nonwoven fabric, and emboss the water- and oil-repellent nonwoven fabric so that it is within the above range. Can do.

<Adhesive used for waterproof and moisture-permeable fabric>
The hot-melt adhesive used for laminating the water- and oil-repellent nonwoven fabric and the polyolefin microporous film does not reduce the moisture permeability of the polyolefin microporous film, and the water- and oil-repellent nonwoven fabric in the manufacturing process of a waterproof moisture-permeable fabric A hot melt adhesive is preferred because the process speed of the laminating process between the polyolefin microporous film and the polyolefin can be improved.

  Here, as the hot melt adhesive, an existing hot melt adhesive can be used, and a synthetic rubber hot melt adhesive, an olefin hot melt adhesive, a composite hot melt adhesive, or the like can be preferably used.

  The synthetic rubber-based hot melt adhesive refers to a thermoplastic elastomer (hereinafter referred to as TPE), a tackifier, and mineral oil. Here, the synthetic rubber-based hot melt adhesive may be composed only of TPE, a tackifier, and mineral oil. In the range that does not impair the effects of the present invention, the synthetic rubber-based hot melt adhesive is TPE. In addition to the tackifier and mineral oil, additives such as various heat stabilizers such as phenol, phosphorus, and sulfur and ultraviolet absorbers may be contained.

  As TPE, it is preferable to use styrene TPE from the viewpoint of excellent workability. Styrene-based TPE is composed of hard segment polystyrene and soft segment. The soft segment mainly includes SBS (polystyrene-polybutadiene-polystyrene), SIS (polystyrene-polyisoprene-polystyrene), SEBS (polystyrene-polyethylene / polybutylene-polystyrene), and SEPS (polystyrene-polyethylene / polypropylene-polystyrene). Among these, SBS and SEBS are preferable from the viewpoint that the adhesive strength of the synthetic rubber-based hot melt adhesive is excellent. SEBS is synthesized by the hydrogenation reaction of SBS.

  The olefin-based hot-melt adhesive refers to an α-olefin that is a thermoplastic resin, a tackifier, and mineral oil. Here, the olefin-based hot melt adhesive may be composed only of an α-olefin, a tackifier, and mineral oil. In the range that does not impair the effects of the present invention, the olefin-based hot melt adhesive is α -In addition to olefins, tackifiers and mineral oils, various heat stabilizers such as phenols, phosphorus and sulfur, additives such as UV absorbers and / or low temperature properties and cohesive strength of olefinic hot melt adhesives. In order to improve it, you may contain a styrene-type elastomer etc. Olefin-based hot-melt adhesives have excellent adhesion to the surface of sheets such as films and fabrics made of nonpolar materials (for example, polyethylene and polypropylene). Examples of the α-olefin include low molecular weight polyethylene, polypropylene (for example, APP (Attack Polypropylene) and APAO (Amorphous Poly Alpha Olefin)), a resin obtained by randomly copolymerizing ethylene and butene-1. Can be mentioned.

  A composite hot melt adhesive refers to an adhesive composed of TPE, α-olefin, tackifier and mineral oil. Here, the composite hot melt adhesive may be composed only of TPE, α-olefin, tackifier and mineral oil, and in the range not impairing the effects of the present invention, the composite hot melt adhesive is TPE. In addition to the α-olefin, the tackifier, and the mineral oil, various heat stabilizers such as phenol, phosphorus, and sulfur, and additives such as an ultraviolet absorber may be contained.

  The hot melt adhesive preferably contains a tackifier in order to adjust the adhesive force, adhesive force, holding force, etc. of the hot melt adhesive. Examples of the tackifier include natural resins such as rosin derivatives, aromatic modified terpene resins and terpene phenol resins, and petroleum resins made of hydrocarbon resins such as hydrogenated petroleum resins. Among these, a hydrogenated petroleum resin is preferable in consideration of suppression of reduction in cohesive strength of the hot melt adhesive, improvement of thermal stability, suppression of odor, and good color tone of the hot melt adhesive.

  It is preferable that content of the said tackifier contained in the hot-melt-adhesive used for the waterproofing moisture-permeable fabric of this invention is 10 mass% or more with respect to the whole hot-melt adhesive. On the other hand, the content of the tackifier contained in the hot melt adhesive is more preferably 60% by mass or less with respect to the entire hot melt adhesive. By setting the content of the tackifier to 10% by mass or more, the tackiness of the hot melt adhesive is further improved and the wettability is further improved. On the other hand, by setting the content of the tackifier to 60% by mass or less, the hot melt adhesive becomes flexible and the adhesive force is improved.

  In order to adjust the tackiness and flexibility of the hot melt adhesive used in the waterproof and moisture permeable fabric of the present invention, the hot melt adhesive preferably contains mineral oil. Examples of the mineral oil include petroleum-based process oils such as liquid polybutene and liquid paraffin.

<Waterproof breathable fabric>
Examples of the waterproof / moisture permeable fabric of the present invention include those obtained by laminating a water / oil repellent nonwoven fabric and a polyolefin microporous film by hot melt adhesive, thermal lamination, or ultrasonic bonding. In the waterproof / moisture permeable nonwoven fabric of the present invention, a water / oil repellent nonwoven fabric is disposed on the outermost surface of at least one surface of the waterproof / moisture permeable nonwoven fabric. With this configuration, the waterproof and moisture-permeable nonwoven fabric of the present invention exhibits water repellency / alcohol repellency and permeation resistance effective against water-soluble contaminated water and ethanol disinfectant.

In the waterproof / moisture permeable nonwoven fabric of the present invention, a water / oil repellent nonwoven fabric having a water pressure resistance of 300 mmH ₂ O or more and a water / alcohol repellency of 5 or more is disposed on the surface of at least one surface. It is important that By adopting such a configuration, permeation resistance (JIS T 8030A method) in the direction of the polyolefin microporous film from the water- and oil-repellent nonwoven fabric to the 80% ethanol aqueous solution of the waterproof and moisture-permeable nonwoven fabric of the present invention is achieved. Class 1 or higher. Although the details of the mechanism are unknown, when an 80% ethanol aqueous solution adheres to the surface of the waterproof and moisture-permeable nonwoven fabric on which the above water- and oil-repellent nonwoven fabric is disposed, Due to the water repellency / alcohol repellency, the 80% ethanol aqueous solution is prevented from penetrating into the water / oil repellent nonwoven fabric, and the waterproof / moisture permeable nonwoven surface on which the water / oil repellent nonwoven fabric is disposed. It is thought that this is because it is easy to move up and stay in a specific place for a long time.

<Various characteristics such as waterproof breathable fabric>
The water / alcohol repellency of the waterproof / moisture permeable fabric of the present invention is preferably 5 or more, more preferably 6 or more. When the waterproof / moisture permeable fabric has an alcohol repellency of 5 or more, the waterproof / moisture permeable fabric exhibits excellent water repellency / alcohol repellency with respect to an ethanol disinfectant (80% ethanol aqueous solution). Here, as a means for setting the water repellency / alcohol repellency of the waterproof / moisture permeable nonwoven to the above range, the above-described water / oil repellent nonwoven fabric may be laminated on the surface layer (surface in contact with the liquid).

  It is important that the permeation resistance (JIS T 8030A method) of the waterproof and moisture-permeable fabric of the present invention to an 80% aqueous ethanol solution is class 1 or higher. Permeation resistance of the waterproof and moisture permeable fabric of the present invention to 80% aqueous ethanol by means of, for example, laminating the above-mentioned water- and oil-repellent nonwoven fabric on the surface layer of the waterproof and moisture-permeable fabric and the above-mentioned polyolefin microporous film. (JIS T 8030A method) can be class 1 or higher. When the waterproof and moisture-permeable fabric of the present invention has a permeation resistance (JIS T 8030A method) of 80% ethanol aqueous solution of class 1 or higher, the waterproof and moisture-permeable fabric has excellent barrier properties against 80% ethanol aqueous solution. .

The moisture permeability of the waterproof moisture-permeable fabric of the present invention is such that when the waterproof moisture-permeable fabric is made into a waterproof moisture-permeable garment, the moisture permeability as an evaluation scale is 200 g / m ² · from the viewpoint of ensuring its excellent wearability. h or more, preferably 250 g / m ² · h or more, more preferably 300 g / m ² · h or more. On the other hand, the upper limit is not particularly limited, but 1000 g / m ² · h or less is preferable from the viewpoint of improving the barrier property. The moisture permeability is evaluated by the A-1 method described in JIS L 1099: 2012. The moisture permeability of the waterproof and moisture-permeable nonwoven fabric can be maintained high without impairing the moisture permeability of the polyolefin microporous film by adjusting the amount of hot melt adhesive applied.

  The tensile strength of the waterproof / breathable fabric of the present invention is preferably 40 N / 50 mm or more from the viewpoint of practicality when working when wearing a waterproof / breathable clothing using the waterproof / breathable fabric. More preferably, it is 60 N / 50 mm or more, More preferably, it is 80 N / 50 mm or more. On the other hand, the upper limit is not particularly limited, but is preferably 500 N / 50 mm or less from the viewpoint of ensuring appropriate softness of the waterproof and moisture-permeable fabric. The tensile strength is evaluated by the method described in JIS L 1096.

  The tensile elongation of the waterproof moisture-permeable fabric of the present invention is less than 50% from the viewpoint of suppressing the comfort and elongation of the polyolefin microporous film when working when wearing the waterproof moisture-permeable clothing using the waterproof moisture-permeable fabric. Is preferable, more preferably less than 40%, still more preferably less than 30%. On the other hand, the lower limit is preferably 10% or more from the viewpoint of improving comfort.

  The burst strength of the waterproof and moisture permeable fabric of the present invention is preferably 400 kPa or more, more preferably 500 kPa or more, and more preferably 600 kPa, from the viewpoint of further suppressing breakage due to external stress when wearing the waterproof and moisture permeable clothing using the waterproof and moisture permeable fabric. While the above is more preferable, the upper limit is not particularly limited, but 2000 kPa or less is preferable. When the bursting strength is 2000 kPa or less, the waterproof and moisture-permeable fabric is more excellent in flexibility and lightness.

  The abrasion strength of the waterproof and moisture permeable fabric of the present invention is such that the waterproof moisture permeable fabric of the waterproof and moisture permeable fabric is more excellent in surface abrasion resistance due to external stress when the waterproof and moisture permeable clothing using the waterproof and moisture permeable fabric is worn. It is preferable that the appearance evaluation when the surface is worn is grade 3 or higher. More preferably, it is quaternary or higher.

  The water pressure resistance of the waterproof and moisture permeable fabric of the present invention is preferably 50 kPa or more, more preferably 70 kPa or more, and more preferably 90 kPa or more from the viewpoint of preventing water from entering from the outside when wearing the waterproof and moisture permeable clothing using the waterproof and moisture permeable fabric. Is more preferable. On the other hand, the upper limit of the water pressure resistance is preferably 300 kPa or less. When the water pressure resistance is 300 kPa or less, an appropriate number of through holes of the microporous film can be provided, and the moisture permeability of the waterproof and moisture permeable fabric can be further improved. In addition, the water pressure resistance of the waterproof and moisture permeable fabric can be adjusted by changing the number of non-woven fabrics laminated on the waterproof and moisture permeable fabric.

The waterproof moisture-permeable fabric of the present invention preferably has a basis weight of 15 to 250 g / m ² . By setting the basis weight to 15 g / m ² or more, the waterproof and moisture permeable fabric has more excellent tensile strength, burst strength, wear strength, and water pressure resistance. From this viewpoint, the basis weight of the waterproof moisture-permeable fabric, 20 g / ^{m 2} or more preferably, 30 g / ^{m 2} or more is more preferable. On the other hand, when the waterproof moisture-permeable fabric has a basis weight of 250 g / m ² or less, when the waterproof moisture-permeable fabric is made into a waterproof moisture-permeable clothing or the like, the waterproof moisture-permeable clothing becomes lighter and its comfort is improved. From this viewpoint, the basis weight of the waterproof moisture-permeable fabric, more preferably from 150 g / ^{m 2} or less, 100 g / ^{m 2} or less is more preferred.

  The water / oil repellent nonwoven fabric of the waterproof / moisture permeable fabric of the present invention preferably has a melting point of the material constituting the water / oil repellent nonwoven fabric higher than the coating temperature of the hot melt adhesive. The hot melt adhesive is preferably applied to the water / oil repellent nonwoven fabric side, and the hot melt adhesive is made to have a higher melting point than that of the hot melt adhesive, thereby increasing the melting point of the material constituting the water / oil repellent nonwoven fabric. Even when the adhesive is applied to the water / oil repellent nonwoven fabric, shrinkage and damage due to heat of the water / oil repellent nonwoven fabric such as the nonwoven fabric can be suppressed. The melting point of the material constituting the water- and oil-repellent nonwoven fabric such as the nonwoven fabric layer and the material constituting the microporous film can be measured using a differential scanning calorimeter DSC-60 manufactured by Shimadzu Corporation.

  Moreover, the waterproof / moisture permeable fabric of the present invention may have a plurality of water / oil repellent nonwoven fabrics and a plurality of polyolefin microporous films. Further, when the waterproof / breathable fabric has a plurality of water / oil repellent nonwoven fabrics, these water / oil repellent nonwoven fabrics may be the same or different. Moreover, when the waterproof and moisture-permeable fabric has a plurality of polyolefin microporous films, these polyolefin microporous films may be the same or different. The waterproof and moisture-permeable fabric of the present invention can have the following configuration. (I) Water / oil repellent nonwoven / polyolefin microporous film, (ii) Water / oil repellent nonwoven / polyolefin microporous film / water / oil repellent nonwoven, (iii) Water / oil repellent nonwoven / polyolefin microporous film / Nonwoven fabric, (iv) water / oil repellent nonwoven fabric / polyolefin microporous film / polyolefin microporous film / nonwoven fabric, etc.

  Among these, as in (iii) above, a three-layer structure in which the water- and oil-repellent nonwoven fabric, the polyolefin microporous film, and the nonwoven fabric are arranged in this order, and the surface layer of the polyolefin microporous film has a water- and oil-repellent nonwoven fabric is preferable. With the above three-layer structure, even when a solvent-based liquid comes into contact with the laminate, the solvent-based liquid is formed into droplets by the water- and oil-repellent nonwoven fabric, and the solvent-based liquid reaches the polyolefin microporous film. It does not reach and has an effect of making it difficult to lose the barrier property.

  Further, as described in (i) above, the two-layer structure of the water / oil repellent nonwoven fabric and the polyolefin microporous film also ensures the desired tensile strength and burst strength of the waterproof moisture permeable fabric, while the moisture permeability of the waterproof moisture permeable fabric. And it is preferable from the viewpoint that the lightness can be further improved.

  The waterproof and moisture permeable fabric of the present invention is formed by bonding a water / oil repellent nonwoven fabric and a polyolefin microporous film with a hot melt adhesive.

  The peel strength of the waterproof and moisture permeable fabric is measured by peeling at the interface between the bonded water and oil repellent nonwoven fabric and the polyolefin microporous film, and the peel strength is preferably 1.0 N / 50 mm or more. 4N / 50mm or more is more preferable, and 1.8N / 50mm or more is further more preferable. The upper limit is not particularly limited, but 50 N / 50 mm is preferable from the viewpoint of improving the moisture permeability of the waterproof and moisture permeable fabric as the amount of hot melt adhesive applied decreases.

  In addition, if the peeling strength of a waterproof moisture-permeable fabric is in said range, the adhesion area per unit area of a waterproof moisture-permeable fabric will not be limited.

  Even after the heating test of the waterproof and moisture permeable fabric at 50 ° C. (50 ° C., humidity 30%, maintained for 24 hours), the peel strength of the waterproof and moisture permeable fabric is preferably 0.8 N / 50 mm or more. More preferably, it is 1.0 N / 50 mm or more, More preferably, it is 1.2 N / 50 mm or more. Furthermore, the peel strength of the waterproof and moisture permeable fabric is more preferably 0.8 N / 50 mm or more even after the heating test of the waterproof and moisture permeable fabric at 60 ° C. (60 ° C., 30% humidity, 24 hours holding). .

<Method for Producing Waterproof Breathable Fabric>
The manufacturing method of the waterproof and moisture-permeable fabric of the present invention can be exemplified by an existing laminating process such as an adhesive laminate, a thermal laminate, or an ultrasonic laminate using a hot melt adhesive. As a method of adhering the interlayer between a water- and oil-repellent nonwoven fabric and a polyolefin microporous film, a laminated structure of a polypropylene spunbond nonwoven fabric and a polypropylene melt blown nonwoven fabric (hereinafter sometimes referred to as a polypropylene SMS nonwoven fabric) and a polyolefin microporous film Adhesion will be described as an example.

  An apparatus for bonding two layers by a hot melt adhesive is roughly divided into a hot melt melter, a hose, a nozzle head, and a pattern controller. For these facilities, known techniques and facilities can be used. There are various types of pattern shapes such as curtain spray, spiral spray, slot coat, and ZIP (Z-shaped pattern). Among them, curtain spray and spiral spray are preferable in terms of moisture permeability, adhesive strength, and softness. In the hot melt adhesive processing, it is preferable not to press and press the calender roll, the three rolls, the emboss roll, etc. after the hot melt adhesive application.

  The hot melt adhesive is preferably applied to a polypropylene spunbonded nonwoven fabric because the polyolefin microporous film is less susceptible to heat shrinkage and damage, and is waterproof and moisture-permeable due to heat applied to the polyolefin microporous film. The shrinkage of the fabric can be further suppressed. Moreover, when applying by curtain spray, since the hot air to supply passes through a nonwoven fabric, it is preferable since there is little rebound of a hot melt adhesive.

  The waterproof / breathable fabric of the present invention has high water repellency / alcohol resistance to solvents, high strength, and excellent moisture permeability, so it can be sewn in the form of coveralls, upper / lower separate types, gowns, etc. It can be suitably used as a waterproof and transparent clothing such as ethanol disinfectant and waterproof and moisture-permeable clothing. In particular, the coverall type is preferable in preventing the entry of contaminants.

Each characteristic was measured and evaluated by the following methods.

(1) Moisture permeability Based on the A-1 method (calcium chloride method) described in JIS L 1099: 2012, moisture permeability was measured and evaluated in units of g / m ² · h.

(2) Thickness The thickness of the polyolefin microporous film was evaluated by the following measuring method. The thickness (μm) was measured using a dial gauge thickness gauge (JIS B 7503: 1997, PURICOCK UPRIIGHT DIAL GAUGE (0.001 × 2 mm), No. 25, probe 10 mmφ flat type, 50 gf load). The measurement was performed 10 times for each sample, and the average value was evaluated.

The thickness of the water / oil repellent nonwoven fabric and the waterproof / breathable cloth was evaluated by the following measuring method. Measured based on the method A described in JIS L 1913: 2010, paragraph 6.1.1. Ten test pieces having a size of 2500 mm ² or more were collected from the sample, and a pressure of 0.5 kPa was applied to the upper circular horizontal plate of the thickness measuring device to adjust the zero point. Thereafter, using a thickness measuring device, a pressure of 0.5 kPa was applied to the test piece in a standard state for 10 seconds, and the thickness was measured to 0.01 mm. The average value of 10 test pieces was obtained.

(3) Burst strength Measured based on the method A described in 8.16.1 of JIS L 1096: 1999. Take 5 pieces of 15cm x 15cm specimens, use a mullen-type rupture tester, put the specimens on top, apply uniform tension so as not to cause wrinkles and sagging, and apply grip pressure with a clamp to apply rubber film Measured the strength to break through the test piece and the strength of the rubber film at the time of rupture, and determined the burst strength by the following formula and calculated the average value. When the burst strength was 400 N or more, it was determined to be acceptable (◯), and less than 400 N was determined to be unacceptable (x).

B _S = A−B
B _S : burst strength (kPa)
A: Strength at which the rubber film breaks through the test piece
B: Strength of rubber film only at break.

(4) Mass per unit area (weight per unit: g / m ² )
It measured based on 6.2 of JIS L 1913: 2010. Five test pieces each having a size of 25 cm × 25 cm were taken from the sample, the weight was measured, and an average value was obtained. The average value was multiplied by 16 to obtain the mass per unit area (g / m ² ).

(5) Tensile strength and tensile elongation Measured based on 6.3.1 of JIS L 1913: 2010. A test piece cut into a width of 50 mm and a length of 300 mm is subjected to a tensile test with a constant-speed extension type tensile tester for three samples in both the longitudinal and lateral directions of the sheet at a gripping interval of 200 mm and a tensile speed of 100 mm / min. The maximum strength when the sample is pulled until it breaks is the tensile strength, the elongation at that time is the tensile elongation, and the average value in the longitudinal and transverse directions of the sheet is calculated. The lower one was defined as the tensile strength (N / 50 mm) and tensile elongation (%) of the fiber layer.

(6) Abrasion strength Measured in accordance with 6.6.2 of JIS L 1913: 2010. Five circular specimens having a diameter of 13 cm were sampled, a hole having a diameter of about 6 mm was made in the center of each specimen, and the surface of the specimen was faced up using a Taber type abrasion tester with a load of 2.45 N and a wear wheel ( Using CS-10), rotational friction was performed 100 times at about 70 min ⁻¹ , and the appearance was classified by a limit photograph (FIG. 14 of JIS L1913: 2010). Abrasion strength was determined to be acceptable (◯) for grade 3 or higher and unacceptable (x) for grade 3 or lower.

(7) Water pressure resistance Measured based on the method B described in JIS L 1092: 2009, paragraph 7.1.1. Take five test pieces of about 150 mm x 150 mm from the sample, attach them to the front side of the water resistance test device so that water hits them, put water into the cylinder, turn the piston handle and apply water pressure at a rate of 100 kPa per minute. The water pressure (kPa) when water comes out from three places on the back side of the test piece or when the waterproof / moisture permeable material ruptures was measured, and the average value of 5 times was defined as the water pressure resistance.

(8) Peel strength Measured according to the method described in JIS L 1089: 2007. Using a universal testing machine (Autograph AG-IS, manufactured by Shimadzu Corporation), a test piece cut into a width of 50 mm and a length of 300 mm is grasped by peeling off at the interface between the bonded nonwoven fabric and the microporous film. A peeling test was conducted when three samples in the sheet longitudinal direction and the transverse direction were peeled into a T-shape (180 °) with a constant speed extension type tensile tester under the conditions of an interval of 50 mm and a tensile speed of 150 mm / min. As shown in FIG. 5 of JIS L 1089: 2007, the evaluation was performed by taking three from the largest value shown when peeling, and three from the smallest value, and calculating an average value of a total of six.

(9) Water Repellency / Alcohol Repellency The water repellency / alcohol repellency was measured according to INDA Standard Test for Water / Alcohol Repeatability Test Method, IST 80.6-92. A liquid mixture (about 50 μl) of isopropyl alcohol (IPA) and water in the proportions shown in Table 1 was dropped on the test piece with a dropper to form a droplet having a diameter of about 5 mm. Create 5 drops of water and let them stand for 5 minutes. Visually observe the shape of the drops. If no liquid intrusion or partial absorption is observed, pass the test. The largest number was the test result. The higher the score, the higher the repulsion rate.

(10) Permeation resistance to 80% ethanol aqueous solution The evaluation was based on JIS T 8030A method (2008). The apparatus is an open circuit type transmission test apparatus disclosed in FIG. 2 of the JIS T 8030A method, and the transmission test cell is a diagram C.1 of the JIS T 8030A method. The one disclosed in 1 was used. The permeation resistance was classified from the breakthrough time based on the permeation rate disclosed in Table 5 of JIS T 8115 (2015). Class 1 or higher was rated as ◯, and less than class 1 was rated as x.

(11) Practicality for disinfection Wearing a waterproof breathable clothing, 80% ethanol aqueous solution from the whole body using a dry cell type spray (herbicidal master (registered trademark) JS-10, manufactured by Koshin Co., Ltd., spraying pressure 0.15 MPa) It sprayed for 1 minute from the position 1 m away, and the thing which did not have the leakage into a waterproofing moisture-permeable clothing and a slipperiness (circle), and the thing with a leak and a slippage was set to x.

<Hot melt adhesive>
The hot melt adhesive is a synthetic rubber-based hot melt adhesive, 10% by mass of mineral oil (liquid paraffin), 30% by mass of synthetic rubber (SBS (polystyrene-polybutadiene-polystyrene)), and a tackifier (hydrogenated terpene resin) 35. The softening point is 104 ° C., and the melt viscosity (Brookfield viscosity) at a temperature of 140 ° C. is 14000 mPa · s.

<Material of laminated sheet>
<Microporous film>
Polyolefin microporous film: polyethylene (thickness 20 μm, melting point 137 ° C., microporous pore diameter 32 μm, moisture permeability 350 g / m ² · h, tensile strength (vertical) 44 N / 50 mm, tensile strength (horizontal) 45 N / 50 mm , Tensile elongation (vertical) 10%, tensile elongation (horizontal) 8%, water pressure resistance 5500 mmH ₂ O,).

<Water / oil repellent nonwoven fabric>
(A) SMS nonwoven fabric A: spunbond / meltblown / spunbond nonwoven fabric (polypropylene, basis weight 35 g / m ² , thickness 0.2 mm, melting point 165 ° C., tensile strength (vertical) 61 N / 50 mm, tensile strength (horizontal) 41 N / 50 mm, water pressure resistance 400 mmH ₂ O, water repellency / alcohol repellency 2).

(B) SMS nonwoven fabric B: SMS nonwoven fabric A processed with water and oil repellency (water pressure resistance 450 mmH ₂ O, water repellency / alcohol repellency 6). In the water / oil repellent treatment, the nonwoven fabric was impregnated with a fluorine-based water / oil repellent (TG-5601, manufactured by Daikin) and dried at 130 ° C.

(C) Spunbond nonwoven fabric C: Polypropylene spunbond nonwoven fabric (weight per unit area: 35 g / m ² ,
Thickness 0.2 mm, melting point 165 ° C., tensile strength (vertical) 68 N / 50 mm, tensile strength (horizontal) 40 N / 50 mm, water pressure resistance 120 mm H ₂ O, water repellency / alcohol repellency 1).

(D) Spunbond nonwoven fabric D: Spunbond nonwoven fabric C obtained by water / oil repellent finish (water pressure resistance 150 mmH ₂ O, water repellency / alcohol repellency 5). In the water / oil repellent treatment, the nonwoven fabric was impregnated with a fluorine-based water / oil repellent (TG-5601, manufactured by Daikin) and dried at 130 ° C.

<Adhesion method>
The method for adhering the water / oil repellent nonwoven fabric and the polyolefin microporous film using hot melt adhesive is to apply ² g to 3 g / m ^{2 of} hot melt adhesive on one side of the nonwoven fabric by curtain spray. Then, a polyolefin microporous film was bonded to the surface of the nonwoven fabric.

<Preparation method of waterproof breathable clothing>
The waterproof and moisture-permeable fabrics of Examples and Comparative Examples were cut out according to the pattern. The sewn portion of the cut out waterproof and moisture-permeable fabric was sewed with ultrasonic waves to produce a waterproof and moisture-permeable clothing.

  Hereinafter, the present invention will be described more specifically based on examples, but the present invention is not limited thereto.

Example 1
After applying a hot melt adhesive to one side of the SMS nonwoven fabric B (water / oil repellent nonwoven fabric) as the surface nonwoven fabric (application amount 2.5 g / m ² , application temperature 140 ° C., processing speed 30 m / min), the SMS nonwoven fabric One side coated with the hot melt adhesive of B and one side of the polyethylene microporous film were adhered. Next, after applying a hot melt adhesive to one side of the spunbond nonwoven fabric C as a backing nonwoven fabric under the same conditions, one side of the spunbond nonwoven fabric C coated with the hot melt adhesive and the other side of the microporous film Were bonded to each other to obtain a waterproof and moisture-permeable nonwoven fabric having a structure of SMS nonwoven fabric B / microporous film / second spunbond nonwoven fabric C. This waterproof / moisture permeable non-woven fabric has a water resistance of 10000 mmH ₂ O, water repellency / alcohol repellency of 6, and permeation resistance in the direction of SMS nonwoven fabric B to polyethylene microporous film against 80% ethanol aqueous solution is class 1 pass. there were. The permeation resistance from the polyethylene microporous film to the SMS nonwoven fabric B in an 80% ethanol aqueous solution was class 1 rejected.

  Cut out this waterproof / breathable non-woven fabric according to the pattern, and ultrasonically sew the waterproof / breathable non-woven fabric cut out so that the outer layer is on the outer side of the waterproof / breathable clothing and the back layer is on the inner side of the waterproof / breathable clothing. Sewing was performed to obtain a waterproof breathable garment of upper and lower separate coveralls type. Practicality for disinfection was neither leaking into the waterproof breathable garment nor dripping. In addition, about the permeation resistance with respect to 80% ethanol aqueous solution of a waterproof moisture-permeable nonwoven, the permeation resistance about the direction from the surface layer of a waterproof moisture-permeable nonwoven to a back layer was evaluated.

(Example 2)
Example 1 is the same as Example 1 except that the surface layer nonwoven fabric is spunbond nonwoven fabric D (water / oil repellent nonwoven fabric) and the back layer nonwoven fabric is SMS nonwoven fabric B. This waterproof / moisture permeable nonwoven fabric has a water resistance of 10000 mmH ₂ O, a water repellency / alcohol repellency of 5, and a permeation resistance from the SMS nonwoven fabric B to the polyethylene microporous film with respect to 80% ethanol aqueous solution. there were. The permeation resistance from the polyethylene microporous film to the SMS nonwoven fabric B in an 80% ethanol aqueous solution was class 1 rejected.
Cut out this waterproof / breathable non-woven fabric according to the pattern, and ultrasonically sew the waterproof / breathable non-woven fabric cut out so that the outer layer is on the outer side of the waterproof / breathable clothing and the back layer is on the inner side of the waterproof / breathable clothing. Sewing was performed to obtain a waterproof breathable garment of upper and lower separate coveralls type. In addition, about the permeation resistance with respect to 80% ethanol aqueous solution of a waterproof moisture-permeable nonwoven, the permeation resistance about the direction from the surface layer of a waterproof moisture-permeable nonwoven to a back layer was evaluated.

(Comparative Example 1)
The same as Example 1 except that the non-woven fabric of the surface layer was changed to SMS non-woven fabric A. This waterproof / moisture permeable nonwoven fabric has a water pressure resistance of 10000 mmH ₂ O, a water repellency / alcohol repellency of ₂ , and a permeation resistance in the direction from the SMS nonwoven fabric A to the polyethylene microporous film against an 80% ethanol aqueous solution. Met.

  Cut out this waterproof / breathable non-woven fabric according to the pattern, and ultrasonically sew the waterproof / breathable non-woven fabric cut out so that the outer layer is on the outer side of the waterproof / breathable clothing and the back layer is on the inner side of the waterproof / breathable clothing. Sewing was performed to obtain a waterproof breathable garment of upper and lower separate coveralls type. Although there was no leakage into the waterproof breathable garment, there was a nuisance for disinfection. In addition, about the permeation resistance with respect to 80% ethanol aqueous solution of a waterproof moisture-permeable nonwoven, the permeation resistance about the direction from the surface layer of a waterproof moisture-permeable nonwoven to a back layer was evaluated.

(Comparative Example 2)
Example 1 is the same as Example 1 except that the spunbond nonwoven fabric C is used as the surface nonwoven fabric. This waterproof / moisture permeable nonwoven fabric has a water resistance of 11000 mmH ₂ O, a water repellency / alcohol repellency of 1, and a class 1 non-permeability of the permeation resistance from the spunbond nonwoven fabric C to the polyethylene microporous film against an 80% ethanol aqueous solution. It was a pass.

  Cut out this waterproof / breathable non-woven fabric according to the pattern, and ultrasonically sew the waterproof / breathable non-woven fabric cut out so that the outer layer is on the outer side of the waterproof / breathable clothing and the back layer is on the inner side of the waterproof / breathable clothing. The top and bottom separate coverall-type waterproof breathable clothing was obtained. Although there was no leakage into the waterproof breathable garment, there was a nuisance for disinfection. Although there was no leakage into the waterproof breathable garment, there was a nuisance for disinfection. In addition, about the permeation resistance with respect to 80% ethanol aqueous solution of a waterproof moisture-permeable nonwoven, the permeation resistance about the direction from the surface layer of a waterproof moisture-permeable nonwoven to a back layer was evaluated.

  Table 1 shows the water / alcohol repellency test solutions.

  Table 2 shows the physical properties of the microporous film.

  Table 3 shows the physical properties of the nonwoven fabric.

  Table 4 shows the physical properties of the waterproof and moisture-permeable fabric.

Claims (3)

Having a laminated structure of polyolefin microporous film and water / oil repellent nonwoven fabric,
The water / oil repellent nonwoven fabric is disposed on the surface of at least one surface,
The water pressure resistance of the water / oil repellent nonwoven fabric is 300 mmH ₂ O or more,
A waterproof / moisture permeable fabric, wherein the water / oil repellent nonwoven fabric has a water / alcohol repellency of 5 or more. The polyolefin microporous film has a moisture permeability of 200 g / m ² · h or more,
The polyolefin microporous film has a tensile strength of 20 N / 5 cm or more,
The waterproof / moisture permeable fabric according to claim 1, wherein the polyolefin microporous film has a water pressure resistance of 5000 mmH ₂ O or more. A waterproof / breathable garment using the waterproof / breathable fabric according to claim 1.