JP2014046576A - Moisture permeation waterproofness fabric for medical care - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a moisture permeation waterproofness fabric that is excellent in moisture permeability, waterproofness, and moist heat resistance, further various durable properties.SOLUTION: Provided is a fabric that comprises laminating a fiber fabric for a front fabric, a microporous film, an adhesive layer, and a fiber fabric for a back fabric in the order. A moisture permeation waterproofness fabric for medical care is characterized in that the fiber for a front fabric and the fabric for a back fabric mainly comprise a polyester fiber together, the microporous film and the adhesive layer mainly comprise a polycarbonate-based polyurethane resin together, and 3-50 mass% of an inorganic fine powder is included in the microporous film. It is desirable that 15-50 mass% of the inorganic fine powder is included in the microporous film, and the microporous film is a uniform film that has many fine pores having a bore diameter of at most 3 μm.

Description

  The present invention relates to a laminated fabric that exhibits good moisture permeability and waterproofness in fields such as medical, nursing care, nursing, and pharmaceuticals.

Moisture-permeable waterproof fabric that has both moisture permeability and waterproofness has the function of releasing water vapor from sweating from the body to the outside of clothes and the function of preventing rainwater from entering the clothes. It is suitable for sports clothes.

  Examples of moisture-permeable and waterproof fabrics include those in which fine yarns are woven at high density and then water-repellent and calendered, and those having a microporous membrane made of polyurethane, polyester, etc. on a woven or knitted fabric. It is known that the one provided with the latter microporous membrane is particularly preferable in terms of waterproofness (see, for example, Patent Documents 1 to 3).

  On the other hand, there are attempts to apply moisture-permeable waterproof fabrics to fields other than winter clothing and sports clothing, for example, medical fields such as white clothes, surgical clothes, gowns, and drapes, and uniform fields such as caregivers and nurses. .

For example, in Patent Document 4, a polyester woven and knitted fabric and a heat-resistant film are bonded and laminated with a heat-resistant adhesive, thereby repeating high-temperature washing (home washing machine 70 ° C.) and autoclave sterilization (121 ° C.) 100. A medical laminated fabric that can achieve a water pressure resistance of 2000 mm or more after rotation has been proposed. Patent Document 5 discloses that a non-porous polyurethane film having a softening point of 190 ° C. or higher is laminated and bonded to a polyester-based long fiber woven knitted fabric so that the water vapor transmission rate is 2000 g / m ² · 24 hrs or more and the water pressure resistance is 0.1 kgf / cm ^2. As described above, a medical laminated fabric that can achieve a bactericidal activity value of 0 or more has been proposed.

Japanese Patent Laid-Open No. 5-78984 JP 2003-20574 A JP 2007-296797 A JP-A-9-78464 JP 2000-316694 A

  When the moisture-permeable and waterproof fabric is applied to medical use, protection against blood, body fluid, and the like is required, and high waterproofness corresponding to that is required. If the desired waterproofness is not achieved, blood, body fluids and the like are likely to permeate, and as a result, the chance of contact with bacteria, viruses and the like increases.

  Furthermore, in the case of medical applications, there is a need for further improvement in wearing comfort compared to that in sports clothing, and there is also a need for a function that can efficiently release heat / steaming generated from body movement and sweating to the outside of the fabric. It is done.

  However, moisture-permeable and waterproof fabrics generally tend to have reduced moisture permeability when water resistance is increased. When attempting to realize water resistance that is suitable for medical use, moisture permeability decreases, and the desired comfortable wearing when used as clothing. There is a problem that sex cannot be obtained.

  In addition, industrial laundry is generally employed for washing fabrics to which dirt derived from blood, body fluids, chemicals, and the like is attached. The water temperature at the time of industrial washing is generally about 60 to 80 ° C., and when it is very dirty, it may be washed in an alkaline bath.

  Furthermore, sterilization after washing is also indispensable for a fabric for medical use. As a sterilization treatment, an autoclave treatment is generally performed by exposing to high pressure steam at 121 ° C. for 20 minutes or 135 ° C. for 8 minutes. Among them, a sterilization treatment at 135 ° C. is frequently used from the viewpoint of enhancing the sterilization effect and shortening the time. ing.

However, such washing and sterilization treatment at high temperatures tends to greatly impair the durability of the resin layer and adhesive layer constituting the moisture-permeable and waterproof fabric, and these layers deteriorate when washing and sterilization treatment are repeated. Or the problem of peeling arises.
The present invention solves the above-described drawbacks, and an object of the present invention is to provide a moisture-permeable and waterproof fabric that is excellent in moisture permeability and waterproofness as well as moisture and heat resistance and various durability.

  As a result of diligent research to solve the above problems, the present inventors have selected and used a polycarbonate-based polyurethane resin that is suitable for forming a waterproof resin layer. It has been found that a resin layer having excellent durability can be formed, and that a desired moisture permeability can be obtained when a predetermined amount of inorganic fine powder is contained in the microporous membrane, leading to the present invention.

  That is, the present invention is a fabric obtained by laminating an outer fabric fiber fabric, a microporous membrane, an adhesive layer, and an outer fabric fabric in this order, and both the outer fabric and the outer fabric are mainly made of polyester fibers. The microporous membrane and the adhesive layer are both mainly made of polycarbonate polyurethane resin, and contain 3 to 50% by mass of inorganic fine powder in the microporous membrane. Is a summary.

  The moisture-permeable and waterproof fabric of the present invention has excellent waterproof properties that can exhibit excellent protection against blood, body fluids, chemicals, etc., and has high moisture permeability that only contributes to further improvement of wearing comfort. It also has. In addition, the moisture-permeable and waterproof fabric of the present invention is less susceptible to deterioration of the resin layer and delamination even after repeated industrial sterilization and autoclaving, and is excellent in various durability.

  From such a point, the moisture-permeable and waterproof fabric of the present invention can be preferably used in medical applications such as medical, nursing, nursing, and pharmaceutical fields.

  Hereinafter, the present invention will be described in detail.

  The moisture-permeable and waterproof fabric of the present invention is a laminate of a surface fabric fiber fabric, a microporous membrane, an adhesive layer and a lining fabric fabric in this order. In the present invention, the microporous film and the adhesive layer are sometimes collectively referred to as “resin layer”.

  As the fiber fabric in the present invention, a fabric mainly composed of polyester fibers is used for both the outer material and the outer material. By using the polyester fiber, it is possible to obtain a fiber fabric that is advantageous in terms of versatility and manufacturing cost in addition to moisture and heat resistance and strength.

  Examples of the polyester polymer constituting the polyester fiber include polyethylene terephthalate and polybutylene terephthalate. In the present invention, filaments, staples, multifilament yarns, spun yarns and the like using such polymers can be used. Examples of the shape of the fiber fabric include a woven fabric, a knitted fabric, and a non-woven fabric, and a woven fabric is generally preferable from the viewpoint of waterproofness.

  Other fibers may be used in combination in the fiber fabric of the present invention as long as the effects of the present invention are not impaired. Examples of other fibers include polyamide-based synthetic fibers such as nylon 6 and nylon 66, polyacrylonitrile-based synthetic fibers, polyvinyl alcohol-based synthetic fibers, semi-synthetic fibers such as triacetate, and natural fibers such as cotton and wool. . In the present invention, the fiber fabric is mainly composed of polyester-based fibers. However, it is preferable to suppress the amount of other fibers used to approximately 20% by mass or less of the whole.

  Moreover, it is preferable to use the water-repellent processed thing for the surface fabric fiber fabric in this invention, and it is more preferable to use the thing which carried out the calendar process in addition to the water-repellent process. As will be described later, in the present invention, a microporous membrane can be formed using a predetermined polyurethane resin solution. By using a fiber fabric that has been subjected to such processing, the resin solution can be contained inside the surface fabric fiber fabric. It becomes difficult to penetrate deeply or breakthrough.

  As the water repellent applied to the water repellent finish, paraffinic water repellent, polysiloxane water repellent, fluorine water repellent and the like can be used. As a water repellent processing method, a spray method, a padding method, a coating method, or the like can be adopted. As specific conditions for the water repellent treatment, for example, a fiber fabric is padded in an aqueous dispersion containing 3 to 10% by mass of a fluorine-based water repellent at a pickup rate of 30 to 100%, and this is performed at 80 to 130 ° C. After drying, conditions for heat treatment at 150 to 180 ° C. for 20 seconds to 2 minutes can be employed.

  Furthermore, in the moisture-permeable and waterproof fabric of the present invention, a microporous membrane and an adhesive layer are laminated in this order on the surface fabric fabric. That is, in the present invention, a structure in which the microporous membrane and the adhesive layer are sandwiched between the front and back fiber fabrics is formed. The reason for using two fiber fabrics is that when the moisture-permeable and waterproof fabric is sterilized with the resin layer exposed, the resin layer easily deteriorates due to wet heat, and the tag feeling increases and the resin layers are separated from each other. It is because it becomes easy to adhere.

  Both the microporous membrane and the adhesive layer are mainly composed of a polycarbonate-based polyurethane resin. The polycarbonate-based polyurethane resin is preferably used in a proportion of 80% by mass or more of the total resin composition. Polyurethane resin is generally suitable for forming a waterproof resin layer, and in the present invention, a polycarbonate resin is selected and used. Thereby, heat-and-moisture resistance and various durability can be improved more.

  Examples of the polycarbonate-based polyurethane resin include, for example, a one-shot method in which polycarbonate diol, organic polyisocyanate, and chain extender are charged together and reacted, or polycarbonate diol and organic polyisocyanate are reacted in advance, and then chain extender is used. Those obtained by a method such as a prepolymer method in which is added and reacted can be used.

  Examples of the polycarbonate diol include alkyl diols such as 1,4-butanediol, 1,5-pentanediol, and 1,6-hexanediol, 2,2-dimethyl-1,3-propanediol, and 2,2-diethyl-1 One or more diols selected from 2,2-dialkyl-1,3-propanediol, such as 2,3-propanediol, 2-pentyl, 2-propyl-1,3-propanediol, and the like, diphenyl carbonate, dito Obtained by transesterification with one or more carbonic diesters selected from diaryl carbonates such as reel carbonate, dialkyl carbonates such as dimethyl carbonate and diethyl carbonate, alkylene carbonates such as ethylene carbonate and tetramethylene carbonate Etc. can be used. Among them, 2,2-dialkyl-1,3-diol is used as a diol from the viewpoint of obtaining a low crystalline resin for the purpose of improving solubility in an organic solvent or obtaining an appropriate viscosity at the time of melting. Propanediol is preferred, and the diester carbonate is preferably diaryl carbonate from the viewpoint of durability against autoclaving.

  Examples of organic polyisocyanates include aliphatic diisocyanates such as tetramethylene diisocyanate and hexamethylene diisocyanate, alicyclic diisocyanates such as 1,4-cyclohexane diisocyanate and isophorone diisocyanate, aromas such as xylylene diisocyanate and 4,4′-diphenyl diisocyanate. A group diisocyanate can be used. Among these, aromatic diisocyanates are preferable from the viewpoint of durability against autoclave treatment.

As the chain extender, 1,4-butanediol, 1,6-hexanediol, ethylenediamine and the like can be used alone or in combination.
Furthermore, in the present invention, in order to improve the moisture permeability of the microporous membrane, it is necessary to contain a predetermined amount of inorganic fine powder in the microporous membrane.

  As the inorganic fine powder, for example, fine powder made of silicon dioxide, aluminum dioxide, titanium dioxide or the like can be used, and the kind is fumed type that is amorphous glassy, has no pores, and is manufactured by a dry method. Those are preferred.

  The average primary particle diameter of the inorganic fine powder is preferably about 7 to 40 nm. When the thickness is less than 7 nm, the moisture permeability improving effect tends not to be recognized so much. When the thickness exceeds 40 nm, large pores are easily formed in the microporous film, and the water pressure tends to decrease. .

  As content of an inorganic fine powder, it is required that it is 3-50 mass% with respect to the whole microporous film, and 5-50 mass is preferable. If the amount is less than 3% by mass, the effect of improving moisture permeability is not recognized. If the amount exceeds 50% by mass, the content of the resin component is relatively reduced, and the microporous membrane becomes brittle, and durability to washing and sterilization treatments Decreases. In addition, it is disadvantageous in terms of workability and film forming cost when forming a microporous film, and it becomes difficult to stably prepare a polyurethane resin-based solution described later.

  Furthermore, in this invention, you may make a microporous film and an adhesive bond layer contain a 3rd component as needed. As the third component, a polyester-based resin is preferable, and the adhesiveness of the resin layer can be improved by containing the resin. For this reason, it can be set as the moisture-permeable waterproof fabric which does not peel easily even if a big load is applied.

  Any polyester-based resin can be used as long as it contributes to improving the adhesiveness of the resin layer. Specifically, one or more diols selected from ethylene glycol, trimethylene glycol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, neopentyl glycol, and the like, and terephthalic acid A polymerization reaction product with at least one dicarboxylic acid selected from isophthalic acid, adipic acid, sebacic acid, dodecanedioic acid and the like can be used. In particular, by applying ethylene glycol and neopentyl glycol as the diol component and terephthalic acid, isophthalic acid and sebacic acid as the dicarboxylic acid component, respectively, an amorphous saturated copolyester resin having a molecular weight of about 10,000 to 50,000 can be obtained. It is preferable because it is easily dissolved in a solvent and has good reactivity with a hydroxyl group or an isocyanate group in a polycarbonate-based polyurethane resin.

  As content of a polyester-type resin, 2-10 mass% is preferable with respect to solid content of a polycarbonate-type polyurethane resin, and 3-8 mass% is more preferable. If the content is less than 2%, the adhesiveness of the resin layer is difficult to improve, and if it exceeds 10% by mass, moisture permeability is lowered, the texture is hardened, and further the quality is deteriorated.

  In the present invention, it is also effective to use a crosslinkable isocyanate compound as the third component. By containing the same compound, the polycarbonate-based polyurethane resin is crosslinked, and the strength of the microporous membrane and the adhesiveness of the adhesive layer to the textile fabric for backing can be improved at the same time.

  As content of a crosslinkable isocyanate compound, about 1-10 mass% is preferable with respect to solid content of a polycarbonate-type polyurethane resin. If the content is less than 1% by mass, both the strength of the microporous film and the adhesiveness of the adhesive layer are difficult to improve. If the content exceeds 10% by mass, the texture of the microporous film tends to be hard, both of which are not preferred. .

  Furthermore, as the third component, various functional agents such as a resin other than the polyester resin, a compound other than the crosslinkable isocyanate compound, a pigment, an antibacterial agent, a deodorant, and a flame retardant may be used as necessary. These contents are preferably about 10% by mass or less with respect to the entire microporous membrane.

  The moisture permeable and waterproof fabric of the present invention is such that the outer fabric fiber fabric, the microporous membrane, the adhesive layer, and the lining fabric fabric are laminated in this order. An arbitrary film may be provided at this location. For example, when it is desired to improve the waterproofness of the fabric, a nonporous film may be laminated on the microporous film. In this case, the resin constituting the nonporous film is preferably a polyurethane resin from the viewpoint of adhesiveness, particularly an ether-based polyurethane resin is preferable in terms of moisture permeability, and a polycarbonate-based polyurethane resin is also preferable in terms of durability. However, when a nonporous film is provided, the moisture permeability of the fabric tends to be lowered. Therefore, it is preferable to provide the nonporous film after sufficiently considering the use and purpose.

  Next, an example is described about the method for obtaining the moisture-permeable waterproof fabric of this invention.

  First, a microporous film is formed by wet coagulation. That is, after applying a polyurethane resin-based solution to a prepared fiber fabric for surface material, the microporous membrane is formed by immersing it in a wet coagulation liquid.

  The polyurethane resin-based solution can be prepared by dissolving or dispersing a polycarbonate-based polyurethane resin and inorganic fine powder as essential components and a third component as an optional component in an organic solvent. Any organic solvent can be used as long as it has an affinity for polyurethane resin, but N, N-dimethylformamide is preferably used from a practical viewpoint. The content of the organic solvent is preferably about 70 to 85% by mass.

  In order to apply the polyurethane resin-based solution to the surface fiber fabric, a knife coating method, a comma coating method, a gravure coating method, or the like may be employed.

  As the wet coagulation liquid, water or an aqueous solution containing a polar organic solvent is preferable, and N, N-dimethylformamide or the like is preferable as the polar organic solvent. In particular, when an N, N-dimethylformamide aqueous solution is used as the wet coagulation liquid, the concentration is preferably 30% or less, more preferably 5 to 30%.

  As conditions for wet coagulation, it is preferable to set the coagulation liquid temperature to 5 to 35 ° C. and the coagulation time to about 30 seconds to 5 minutes, respectively, and solidify the solids contained in the polyurethane resin solution in the wet coagulation liquid. Thus, a microporous film is formed. Thereafter, for the purpose of removing N, N-dimethylformamide adhering to the microporous membrane as necessary, it is washed with hot water at a temperature of 35 to 80 ° C. for 1 to 10 minutes, and further at a temperature of 50 to 150 ° C. It is good to dry for 1 to 10 minutes under.

  The thickness of the microporous membrane is preferably about 10 to 100 μm, and more preferably 15 to 50 μm.

  In general, when a polyurethane resin solution is applied to a fiber fabric and then immersed in water, the organic solvent and water in the polyurethane resin solution are quickly replaced by a solvent, and a large hole (long hole) having a diameter of 5 to 50 μm is formed in the membrane. Formed inside. At this time, if an aqueous solution containing a polar organic solvent is used in place of water as the wet coagulation liquid, the solidification rate of a solid content mainly composed of a polyurethane resin can be delayed. If it does so, formation of a long hole will be suppressed and it will become easy to form a film of a form (nanoporous) richer in microporosity. In this respect, the formation of large pores in the membrane tends to be disadvantageous in obtaining desired waterproofness. If the film is thickened to compensate for the disadvantageous waterproofness, the moisture permeability is reduced by moisture resistance, and the texture tends to be impaired. Therefore, it can be said that the more porous the microporous membrane is, the easier it is to harmonize moisture permeability, waterproofness and texture in the moisture permeable waterproof fabric.

  The microporous membrane in the present invention contains 3 to 50% by mass of inorganic fine powder, but the use of inorganic fine powder is also advantageous in forming a nanoporous microporous membrane. When inorganic fine powder is used, the organic solvent is adsorbed on the surface thereof, and the concentration of the organic solvent increases around the inorganic fine powder. And if solid content is solidified in that state, it will become easy to form a hole around the inorganic fine powder, and as a result, it becomes difficult to form a large hole. According to the study by the present inventors, the polyurethane resin solution prepared so that the content of the inorganic fine powder in the microporous membrane is preferably 15 to 50% by mass, more preferably 20 to 50% by mass. It was found that a uniform film having a large number of micropores having a pore diameter of preferably 3 μm or less, more preferably 1 μm or less is formed. And, forming such a nanoporous microporous membrane is advantageous in terms of harmonizing moisture permeability, waterproofness and texture in the moisture permeable waterproof fabric as described above, and at the same time, against moisture heat resistance, blood, body fluids, chemicals, etc. The present inventors have newly found that it is remarkably advantageous in terms of protective properties, particularly virus barrier properties.

  The pore diameter is measured using a cross-sectional photograph of the microporous membrane. That is, using a scanning electron microscope (manufactured by Hitachi, Ltd., S-4000 field emission scanning electron microscope), a cross-sectional photograph of the microporous membrane was taken at a magnification of 10,000 times, and the pore diameter was calculated based on this photograph. To do. The cross-sectional shape of the hole includes various shapes including a circle. As the hole diameter of a hole other than a circle, the diameter of a circle having the same area as the hole is used as the hole diameter. Also, the form of the hole includes a closed hole, a part in which adjacent holes are partly connected, or a part in which the inside of the film communicates with the surface. When the holes are connected, a missing outline is drawn based on the remaining outline so that each hole has a shape close to a circular cross section, and the hole diameter is calculated.

  In the present invention, it is preferable to provide a nonporous film on the microporous film as described above. For the formation of the nonporous film, a polyurethane resin-based solution is preferably used, and any of solvent type, emulsion type, and water-soluble type can be used as the type of solution.

  As specific conditions for forming the nonporous film, a predetermined polyurethane resin-based solution is prepared, and the solution is placed on the microporous film by using a knife coating method, a comma coating method, a gravure coating method, or the like. After coating, a condition of drying at 50 to 150 ° C. for 30 seconds to 10 minutes can be employed.

  The thickness of the nonporous film is preferably about 0.5 to 10 μm, and more preferably 1 to 5 μm.

  The moisture-permeable and waterproof fabric of the present invention further includes an adhesive layer and a textile fabric for lining. That is, the microporous membrane and the lining fiber fabric are bonded by an adhesive layer mainly composed of a polycarbonate-based polyurethane resin. Needless to say, when a non-porous film is laminated on the microporous film, the non-porous film and the textile fabric for backing are bonded through an adhesive layer.

  As the polycarbonate-based polyurethane resin constituting the adhesive layer, those having the same composition as that of the resin constituting the microporous membrane can be used, but it is preferable as an adhesive such as a tag feeling and viscosity by adjusting the molecular weight and the like. It is advisable to use those optimized for various characteristics. Further, it is practically preferable to use a cross-linked resin as the type of resin.

  For the formation of the adhesive layer, as in the case of the microporous film and the nonporous film, a method using a polyurethane resin solution can be adopted, and a method using hot melt can also be adopted.

  For example, a polyurethane resin-based solution is preferably a two-component curable type and having a viscosity in the range of 500 to 5000 mPa · s. First, a gravure coating method, a comma coating method, etc. are employ | adopted and a solution is apply | coated on the microporous film (or nonporous film) or the textile fabric for backing. Then, if it dries and both are crimped | bonded or thermocompression-bonded using a laminating machine etc., both can be bonded.

  On the other hand, in the case of hot melt, a moisture-curing type that reacts with moisture in the air is suitable, and practically, one that melts in a temperature range of about 80 to 150 ° C. is more preferable. First, the hot melt resin is melted in consideration of the melting point of the resin and the viscosity at the time of melting. Thereafter, a melted resin is applied onto a microporous membrane (or non-porous membrane) or a textile fabric for backing, and the two may be pressure-bonded using a laminating machine or the like while cooling at room temperature.

  The adhesive layer may be formed on the entire surface of the film, but may be formed in a pattern from the viewpoint of moisture permeability and texture of the moisture permeable and waterproof fabric. Although it does not specifically limit as a pattern-like form, A dot shape, a line shape, a grid | lattice shape, a checkered pattern, a tortoiseshell pattern, etc. are mention | raise | lifted and it is fundamentally preferable to arrange | position uniformly throughout.

  The occupied area of the adhesive layer with respect to the membrane or fiber fabric is preferably about 25 to 90%, more preferably 40 to 70% with respect to the total area. If the occupied area is less than 25%, it is difficult to obtain a durable moisture-permeable waterproof fabric even if the adhesive layer is thickened. If it exceeds 90%, the adhesion is sufficiently increased, but the moisture permeability and texture tend to decrease. Therefore, it tends to be disadvantageous in obtaining a flexible moisture-permeable and waterproof fabric, which is not preferable.

  As a thickness of an adhesive bond layer, about 20-100 micrometers is preferable and 30-80 micrometers is more preferable. If the thickness is less than 20 μm, it is difficult to obtain a durable moisture-permeable waterproof fabric even if the area occupied by the adhesive is widened, and if it exceeds 100 μm, the manufacturing cost increases and further adhesiveness tends not to be expected. Both are not preferred.

  Moreover, as a textile fabric for lining, the thing mainly comprised using the polyester-type fiber like a surface material is used. In this case, when high waterproofness is required for clothes using a moisture permeable waterproof fabric, a waterproof seam tape may be thermocompression bonded to the sewing part, so the thickness, lightness, and adhesiveness of the seam tape Furthermore, in consideration of waterproofing after the seam tape is adhered, it is preferable to configure the fiber fabric using fine yarns having a total fineness of 15 to 44 dtex.

  The moisture-permeable and waterproof fabric of the present invention having the above-described configuration is suitable for medical use. The medical use referred to in the present invention is not limited to the medical field intended for hospitals, but also encompasses the nursing, nursing, pharmaceutical fields and the like located in the vicinity thereof.

  Next, the present invention will be specifically described with reference to examples. In addition, industrial washing, sterilization treatment, and various physical property evaluations were performed by the following methods.

1. Industrial Washing and Sterilization Treatment In evaluating the moisture and heat resistance and durability of a moisture permeable and waterproof fabric, industrial washing and sterilization treatment were performed according to the following procedure.

  First, 1.5 kg of the moisture-permeable and waterproof fabric obtained in an industrial washing machine (LM-W type, manufactured by Suga Test Instruments Co., Ltd.) is introduced, and the bath ratio is adjusted to 1:40. Next, 1 g / L of pure soap (manufactured by Fudo Chemical Co., Ltd.) is added as a detergent, and 0.8 g / L of caustic soda is further added to adjust the pH value of the washing water to 10. Then, the temperature of the washing water is gradually raised over about 10 minutes, and washing is performed for 200 minutes while maintaining 73 ° C. And after draining, water is newly added, the temperature is raised at once, and the water is washed for 30 minutes while maintaining 40 ° C. After draining, overflow rinse at room temperature for 15 minutes. Thereafter, it is dehydrated and tumble dried at 60 ° C. for 20 minutes. With the above operation, it is considered that industrial washing was performed 10 times.

  Next, the moisture-permeable waterproof fabric that was industrially washed was introduced into an autoclave (HV50 type, manufactured by Hirayama Seisakusho Co., Ltd.), gradually heated over about 30 minutes, and exposed to high-pressure steam for 80 minutes while maintaining 135 ° C. did. Then, the temperature is gradually lowered to 70 ° C. over about 20 minutes, and tumble drying is performed at 60 ° C. for 20 minutes. With the above operation, it is considered that the sterilization process was performed 10 times.

  In addition, when evaluating moisture and heat resistance and durability, a series of treatments in which one cycle of industrial washing at 73 ° C. for 20 minutes and sterilization treatment at 135 ° C. for 8 minutes is performed as a predetermined cycle. It can be said that more practical aspects can be added. However, on the other hand, repeating such a series of processes requires a great deal of labor, and it can be determined that performing industrial washing and sterilization processes together contributes to a reduction in the labor. Therefore, in the present invention, it is considered that the industrial washing and sterilization treatment is performed 10 cycles by performing the above two operations once, and the series of processing is regarded as having been performed 50 cycles by repeating the two operations 5 times.

2. Moisture and heat resistance The above two operations are repeated 5 times on a moisture-permeable and waterproof fabric (50 cycles of industrial washing and sterilization treatment), and the moisture resistance and heat resistance are evaluated based on the degree of waterproofness and delamination.

  First, with respect to waterproofing, the water pressure resistance after 50 cycles is measured and evaluated based on the obtained numerical values. The water pressure resistance is measured based on JIS L1092 (high water pressure method).

  On the other hand, delamination is evaluated from the bonding ratio between members (fiber fabric, resin layer, etc.) constituting the moisture-permeable and waterproof fabric. That is, when the pasting ratio between the members before performing the above two operations (initial stage) is 100%, the pasting ratio between the most delaminated members after 50 cycles is measured and evaluated in the following four stages. To do.

0% or more and less than 50%: Total peeling 50% or more and less than 75%: Partial peeling 75% or more and less than 95%: Minute peeling 95% or more: No peeling

3. Durability related to protective properties An artificial blood barrier property test is performed based on the ASTM F1670-08B method, and a virus barrier property test is performed based on the ASTM F1671-07B method for each of the initial and after 50 cycles. Evaluate the durability of protection.

4). Moisture permeability The moisture permeability is evaluated by measuring moisture permeability based on JIS L1099 A-1 method (calcium chloride method) and B-1 method (potassium acetate method).

5. Adhesiveness The peel strength in the warp direction in the initial stage is measured based on JIS L1089, and the adhesiveness is evaluated.

6). Observation of thickness and cross-sectional shape of microporous film Using a S-4000 field emission scanning electron microscope manufactured by Hitachi, Ltd., taking a cross-sectional photograph at a magnification of 2000 times, and measuring the thickness of the microporous film Observe the cross-sectional shape.

(Reference Example 1)
[Preparation of fiber fabric for surface material]
A plain tissue production machine having a warp density of 110 yarns / 2.54 cm and a weft density of 90 yarns / 2.54 cm was woven using polyethylene terephthalate multifilament yarn 83dtex72f as both warp and weft yarns.

After weaving, 1 g / L of a scouring agent (manufactured by Nikka Chemical Co., Ltd., Sunmol FL) was used to scour the raw machine at 80 ° C. for 20 minutes, and a disperse dye (Dianx Blue, manufactured by Dystar Japan Co., Ltd.) The fabric was dyed at 130 ° C. for 30 minutes in a dyebath containing 0.5% omf of (UN-SE).
Subsequently, after final setting at 170 ° C. for 1 minute, a commercially available fluorine-based water repellent emulsion (Asahi Glass Co., Ltd., Asahi Guard AG-E061, solid content of 20% by mass) is used. A dispersion was prepared, and an aqueous dispersion was applied to the woven fabric by a padding method at a pickup rate of 40%. After application, after drying at 120 ° C. for 2 minutes and further heat-treating at 170 ° C. for 40 seconds, using a calendering machine having a mirror roll, calendering was performed at a temperature of 175 ° C., a pressure of 300 kPa, and a speed of 25 m / min. A fiber fabric for surface material was obtained.

(Reference Example 2)
[Fiber fabric for lining]
A 28-gauge tricot fabric was knitted using polyethylene terephthalate multifilament yarn 33dtex12f and scoured at 80 ° C. for 20 minutes to obtain a textile fabric for lining.

Example 1
Resamine CUS-1500 (manufactured by Dainichi Seika Kogyo Co., Ltd., solid content concentration: 30% by mass, polycarbonate polyurethane resin) and AEROSIL COK84 (manufactured by Nippon Aerosil Co., Ltd., average primary particle size of about 16 nm) After roughly kneading 2 parts by mass of a mixed fine powder of hydrophilic silicon dioxide and aluminum oxide, this was kneaded using a three-roll mill. Then, resamine X (manufactured by Dainichi Seika Kogyo Co., Ltd., solid content concentration: 100% by mass, crosslinkable isocyanate compound) and N, N-dimethylformamide are added and degassed to form a polyurethane having the composition shown in Formula 1 below. A resin-based solution was prepared. The resulting solution had a solid content concentration of 24% by mass and a viscosity of 12000 mPa · s at 25 ° C. Moreover, 6 mass% of mixed fine powder was contained with respect to 100 mass% of total solid content.

Next, 100 g / m ^{2 of the} polyurethane resin solution was applied to the calendered surface of the outer fabric fiber fabric using a comma coating method. Then, the fabric was introduced into a bath of 15% N, N-dimethylformamide aqueous solution (20 ° C.) and immersed for 2 minutes to solidify the solid content. Subsequently, it was sufficiently washed with overflowing hot water using a 50 ° C. hot water bath, the fabric was squeezed with a mangle, and subsequently introduced into a dryer and dried at 140 ° C. for 2 minutes to form a microporous film.

  When the cross-sectional shape of the obtained microporous film was observed with a scanning electron microscope, the thickness was 50 to 60 μm. Further, although long holes were formed in the range of 5 to 40 μm in the film, many fine holes having a hole diameter of 3 μm or less were also formed.

<Prescription 1>
Rezamin CUS-1500 100 parts by weight AEROSIL COK84 2 parts by weight Rezamine X 2 parts by weight N, N-dimethylformamide 40 parts by weight

Next, using a dot-shaped gravure roll (dot diameter 0.75 mm, dot interval 0.25 mm, 25 mesh, depth 0.25 mm), a polyurethane resin solution having a composition shown in the following formulation 2 (solid content concentration 59 mass%, A viscosity of 4000 mPa · s at 25 ° C. was applied on the microporous membrane in a dot-like manner at a ratio of about 50% occupied area to about 60 g / m ² . Then, the adhesive bond layer was formed by drying at 120 degreeC for 2 minutes. And the textile fabric for lining was bonded by the pressure of 300 kPa, and it aged for 3 days in the environment of 40 degreeC x 80% RH, and obtained the moisture-permeable waterproof fabric for medical use.

<Prescription 2>
Rezamin UD-8373 100 parts by mass (manufactured by Dainichi Seika Kogyo Co., Ltd., solid content concentration 70% by mass, two-component curable polycarbonate polyurethane resin)
Resamine NE 12 parts by mass (manufactured by Dainichi Seika Kogyo Co., Ltd., solid content concentration 70% by mass, crosslinkable isocyanate compound)
Rezamin UD-103NT 1 part by mass (manufactured by Dainichi Seika Kogyo Co., Ltd., crosslinking accelerator)
20 parts by mass of methyl ethyl ketone

(Example 2)
Instead of using 3 parts by mass of AEROSIL COK84, use 5 parts by mass of AEROSIL R974 (manufactured by Nippon Aerosil Co., Ltd., hydrophobic silicon dioxide fine powder having an average primary particle size of about 12 nm), and after kneading A polyurethane resin solution having the composition shown in Formula 3 below was prepared in the same manner as in Example 1 except that the amount of N, N-dimethylformamide added was changed to 30 parts by mass instead of 40 parts by mass. The resulting solution had a solid content concentration of 27% by mass and a viscosity of 13000 mPa · s / 25 ° C. at 25 ° C. Moreover, 14 mass% of silicon dioxide fine powder was contained with respect to 100 mass% of total solid content.

Then, the amount of the polyurethane resin solution applied to the surface fiber fabric was changed to 90 g / m ² , and a microporous membrane was formed in the same manner as in Example 1. It was 50-60 micrometers when the thickness of the microporous film was measured. Further, although long holes were formed in the range of 5 to 40 μm in the film, many fine holes having a hole diameter of 3 μm or less were also formed.

<Prescription 3>
Rezamin CUS-1500 100 parts by mass AEROSIL R974 5 parts by mass Rezamin X 2 parts by mass N, N-dimethylformamide 30 parts by mass

Next, a moisture-curable reactive hot-melt polycarbonate polyurethane resin (manufactured by DIC Corporation, Tyforce NH-100X) was prepared. After melting this at 120 ° C. (melt viscosity of 300 mPa · s), the molten resin is obtained using a dot-like gravure roll (dot diameter of 0.75 mm, dot interval of 0.25 mm, adhesion area of 63%, depth of 0.15 mm). About 40 g / m ^{2 was} applied on the microporous membrane at a rate of about 50% occupied area. Then, the adhesive bond layer was formed by naturally cooling. And the textile fabric for lining was bonded by the pressure of 300 kPa, and it aged for 4 days in the environment of 40 degreeC, and obtained the moisture-permeable waterproof fabric for medical use.

(Example 3)
Instead of using 30 parts by mass of N, N-dimethylformamide, 31 parts by mass of N, N-dimethylformamide solution containing 1 part by mass of polyester resin (1 part by mass of polyester resin and N, N- A polyurethane resin solution having the composition shown in Formula 4 below was prepared in the same manner as in Example 2 except that (containing 30 parts by mass of dimethylformamide). Here, Elitel UE3220 manufactured by Unitika Ltd. was used as the polyester resin. The resulting solution had a solid content concentration of 28% by mass and a viscosity of 13000 mPa · s / 25 ° C. at 25 ° C. The polyester resin and silicon dioxide fine powder were contained in an amount of 3% by mass and 13% by mass, respectively, with respect to 100% by mass of the total solid content.

<Prescription 4>
Resamine CUS-1500 100 parts by weight AEROSIL R974 5 parts by weight Rezamine X 2 parts by weight N, N-dimethylformamide solution 31 parts by weight

  Thereafter, the same procedure as in Example 2 was performed to obtain a medical moisture-permeable waterproof fabric. In addition, when the thickness of the film | membrane was measured in the step which formed the microporous film | membrane, it was 55-65 micrometers. When the inside of the film was observed, long holes were formed in the range of 5 to 45 μm, but many fine holes having a hole diameter of 3 μm or less were also formed.

Example 4
100 parts by mass of Rezamin CU-8614 (manufactured by Dainichi Seika Kogyo Co., Ltd., solid content concentration 30% by mass, high modulus type polycarbonate polyurethane resin), 12 parts by mass of AEROSIL R974, and 35 parts by mass of N, N-dimethylformamide Were roughly kneaded and then kneaded using a three-roll mill. Then, 12 parts by mass of an N, N-dimethylformamide solution in which 2 parts by mass of a polyester resin is dissolved (containing 2 parts by mass of a polyester resin and 10 parts by mass of N, N-dimethylformamide) and 2 parts by mass of resamine X By adding and degassing, a polyurethane resin-based solution having the composition shown in Formula 5 below was prepared. Here, Elitel UE3220 manufactured by Unitika Ltd. was used as the polyester resin. The resulting solution had a solid content concentration of 29% by mass and a viscosity of 11000 mPa · s at 25 ° C. The polyester resin and silicon dioxide fine powder were contained in an amount of 4% by mass and 26% by mass, respectively, with respect to 100% by mass of the total solid content.

<Prescription 5>
Resamine CU-8614 100 parts by weight AEROSIL R974 12 parts by weight Rezamine X 2 parts by weight N, N-dimethylformamide solution 12 parts by weight N, N-dimethylformamide 35 parts by weight

  Thereafter, the same procedure as in Example 3 was performed to obtain a medical moisture-permeable waterproof fabric. In addition, when the thickness of the film | membrane was measured in the step which formed the microporous film | membrane, it was 30-40 micrometers. Further, no long holes were observed in the film, and it was confirmed that a uniform film having a large number of micropores having a pore diameter of 3 μm or less was formed.

(Example 5)
A polyurethane resin-based solution having a composition shown in the following prescription 6 (solid content concentration: 27 mass%, viscosity at 25 ° C .: 3000 mPa · s) was prepared. In Example 4, after forming a microporous film, the solution was applied over the entire surface of the microporous film at a rate of 20 g / m ² using a knife coater. Thereafter, a non-porous film having a thickness of about 3 μm was formed by drying at 120 ° C. for 2 minutes.

<Prescription 6>
Heimlen Y-237NS 100 parts by mass (manufactured by Dainichi Seika Kogyo Co., Ltd., solid content concentration 25% by mass, hard yellowing type polyether polyurethane resin)
Methyl ethyl ketone 20 parts by mass Resamine X 1 part by mass

  Thereafter, the same procedure as in Example 4 was performed to obtain a medical moisture-permeable waterproof fabric.

(Examples 6 and 7)
Except for omitting resamine X in <Prescription 4> (Example 6), or omitting resamine X and using N, N-dimethylformamide instead of N, N-dimethylformamide solution (Example 7), In the same manner as in Example 3, moisture permeable and waterproof fabrics were obtained.

(Comparative Examples 1 and 2)
Except for omitting AEROSIL COK84 in <Prescription 1> (Comparative Example 1), or using 0.7 parts by mass instead of 2 parts by mass (Comparative Example 2), the same as Example 1 A moisture-permeable waterproof fabric was obtained by each method. In the polyurethane resin solution according to Comparative Example 2, the mixed fine powder was contained in an amount of 2% by mass with respect to 100% by mass of the total solid content.

(Comparative Example 3)
100 parts by mass of Rezamin CU-8614, 40 parts by mass of AEROSIL R974, and 70 parts by mass of N, N-dimethylformamide were coarsely kneaded and then finally kneaded using a three-roll mill. At this time, since a considerable amount of AEROSIL R974 was used, the viscosity was adjusted using 70 parts by mass of N, N-dimethylformamide. Thereafter, a polyurethane resin-based solution having the composition shown in Formula 7 below was prepared by the same method as in Example 4. As the polyurethane resin solution, thixotropic properties are remarkably exhibited, so that it is difficult to handle. The resulting solution had a solid content concentration of 33% by mass and a viscosity of 17000 mPa · s at 25 ° C. Further, the polyester resin and silicon dioxide fine powder were contained in an amount of 3% by mass and 54% by mass, respectively, with respect to 100% by mass of the total solid content.

<Prescription 7>
Resamine CU-8614 100 parts by weight AEROSIL R974 40 parts by weight Rezamin X 2 parts by weight N, N-dimethylformamide solution 12 parts by weight N, N-dimethylformamide 70 parts by weight

  Thereafter, the same procedure as in Example 4 was performed to obtain a moisture-permeable and waterproof fabric. In addition, when the thickness of the film | membrane was measured in the step which formed the microporous film | membrane, it was 30-35 micrometers. Further, no long holes were observed in the film, and it was confirmed that a uniform film having a large number of micropores having a pore diameter of 3 μm or less was formed. On the other hand, however, the obtained film had a strong muscle feeling and had a problem in quality.

(Comparative Example 4)
Use Lacskimin UJ-8517 (Seiko Kasei Co., Ltd., solid content 26% by mass, polyester polyurethane resin) instead of Rezamin CUS-1500, and use amount of AEROSIL R974 instead of 5 parts by mass. It is shown in the following prescription 8 by the same method as in Example 2 except that the addition amount of N, N-dimethylformamide after the main kneading is 20 parts by mass instead of 30 parts by mass. A polyurethane resin solution having the composition was prepared. The resulting solution had a solid content concentration of 26% by mass and a viscosity of 15000 mPa · s / 25 ° C. at 25 ° C. Moreover, 14 mass% of silicon dioxide fine powder was contained with respect to 100 mass% of total solid content.

<Prescription 8>
Lacskimin UJ-8517 100 parts by weight AEROSIL R974 4.5 parts by weight Resamine X 2 parts by weight N, N-dimethylformamide 20 parts by weight

  Thereafter, the same procedure as in Example 2 was performed to obtain a moisture-permeable and waterproof fabric. In addition, when the thickness of the film | membrane was measured in the step which formed the microporous film | membrane, it was 50-60 micrometers. When the inside of the film was observed, long holes were formed in the range of 5 to 40 μm, but many fine holes having a hole diameter of 3 μm or less were also formed.

(Comparative Example 5)
By using the same method as in Example 2 except that Tyforce WT-004 (manufactured by DIC Corporation, moisture-curing reactive hot-melt polyether polyurethane resin) is used instead of Tyforce NH-100X. A wet waterproof fabric was obtained.

  Table 1 shows the evaluation results of the moisture-permeable and waterproof fabrics according to Examples 1 to 5 and Comparative Examples 1 to 5.

The fabric of the present invention was excellent in moisture permeability and waterproofness as well as moisture and heat resistance and durability. For this reason, it was suitable for medical use.
In particular, in the fabric according to Example 3, since the microporous membrane was formed by using a polyester resin together, the adhesiveness of the membrane was superior to the fabric according to Example 2. Furthermore, by comparing the two examples, it was confirmed that when the adhesiveness was improved, it was difficult to reduce the water pressure resistance after industrial washing and sterilization.

  In the fabric according to Example 4, since the microporous membrane was in a nanoporous form, it was confirmed that the fabric according to Example 4 was superior in moisture permeability and waterproofness and superior in virus barrier properties as compared with the fabric according to Example 3. did it. Furthermore, when the texture of both fabrics was confirmed by handling, the fabric according to Example 4 was more flexible and flexible than that of Example 3.

  Moreover, since the non-porous was formed in the fabric concerning Example 5, it was excellent in waterproofness compared with the cloth concerning Example 4. Examples 4 and 5 were excellent in terms of durability related to virus barrier properties.

  Furthermore, the fabric according to Examples 2, 3, and 6 in which the microporous film is formed using a third component such as a polyester-based resin and a crosslinkable isocyanate compound has the microporous film formed of only essential components. Compared to the fabric according to Example 7, it was superior in terms of adhesiveness. At the same time, with the improvement of the adhesiveness, the heat and humidity resistance also improved. Moreover, it has confirmed that the polyester-type resin contributed to the said adhesive improvement rather than a crosslinkable isocyanate compound from the contrast of the fabric concerning Example 2, 6. FIG.

  On the other hand, in Comparative Examples 1 and 2, the content of the inorganic fine powder in the microporous membrane did not satisfy the predetermined range, so that the moisture permeability was inferior to that in Example 1. On the contrary, in Comparative Example 3, the content of the inorganic fine powder was too large, so that the film was fragile. As a result, compared with Example 4, the film was greatly inferior in terms of durability and heat and humidity resistance.

Furthermore, in Comparative Example 4, since the microporous layer was composed of a polyester-based polyurethane resin, the microporous film was pulverized and completely peeled off by industrial washing and sterilization treatment. In Comparative Example 5, since the adhesive layer was made of a polyether-based polyurethane resin, the adhesive layer was completely peeled off by industrial washing and sterilization treatment. As a result, compared with Example 2, both were greatly inferior in terms of durability.

Claims (4)

  A fabric formed by laminating an outer fabric fiber fabric, a microporous membrane, an adhesive layer, and a backing fabric fabric in this order, and the outer fabric fabric and the backing fabric are both mainly composed of polyester fibers, and the microporous membrane and A medical moisture-permeable waterproof fabric characterized in that both adhesive layers are mainly composed of a polycarbonate-based polyurethane resin, and 3 to 50% by mass of inorganic fine powder is contained in the microporous membrane.   2. The medical use according to claim 1, wherein the microporous membrane contains 15 to 50% by mass of inorganic fine powder, and the microporous membrane is a uniform membrane having a large number of micropores having a pore diameter of 3 μm or less. Moisture permeable waterproof fabric.   The medical moisture-permeable and waterproof fabric according to claim 1 or 2, wherein the microporous membrane contains 2 to 10% by mass of a polyester-based resin. The moisture permeable waterproof fabric for medical use according to any one of claims 1 to 3, wherein a nonporous membrane is laminated on the microporous membrane.