JPH01222954A - Moisture-permeable water-proof cloth - Google Patents

Abstract

PURPOSE:To improve moisture permeability and feeling upon touch of a cloth, by so arranging a predetermined resin film attached and laminated on the surface of a base cloth of said cloth as to contain predetermined fine powdery particles of gelatin and fine leather powders, and melting wholly or partially said gelatin particles by hot water or boiling water. CONSTITUTION:A base cloth A constituting a moisture-permeable water-roof cloth is generally formed of a non-woven, knitted or woven fabric of rayon, nylon and blended yarns of these rayon and nylon. A resin coating film B is laminated in one layer onto the surface of the base cloth A in a thickness smaller than 0.2mm. A resin 1 of the laminated film B contains fine gelatin particles 2 having the diameter not larger than 8mum and, fine leather powders 3. The gelatin particles 2 contained in the laminated film B are dissolved by hot water or boiling water, and therefore the part of the film B where the gelatin particles 2 are dissolved out becomes hollow, resulting in formation of a complicated hole 4 in the film B.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention provides a resin film that is soft to the touch by impregnating fine leather powder and providing a large number of fine holes in the resin film that is laminated on the surface of the base fabric. To provide a moisture-permeable waterproof fabric that has a moisture-permeable function and also has a waterproof function.

(Conventional technology) Conventional moisture-permeable waterproof fabrics are made by coating the surface of a nylon base fabric with a resin film such as polyurethane.

Alternatively, the coated coat or film is made extremely thin by attaching a laminate film, and is produced by providing fine holes in the coated coat or film.

By setting the pore diameter of the coated film or film formed on the surface of this base fabric to about 0.5 to 5 pm, it is possible to block the permeation of water droplets while allowing the permeation of water vapor. It was used as fabric for clothing, etc.

(Problems to be Solved by the Invention) Conventional moisture permeable waterproof fabrics have a coating film formed on the base fabric surface or a film film made of a laminate film laminated to the base fabric surface with a thickness of about 0.5 to 57 Lm. It was necessary to uniformly create fine pores with a diameter of . It is technically difficult to uniformly and evenly create countless minute pores with pore diameters of around 0.5 to 57 zm in such a film, and the pores may be ubiquitous or the pore diameter may vary. There was an inconvenience that variations occurred.

In addition, in order to create such countless fine pores in the coated film or the film film attached to the base fabric, the film itself needs to be extremely thin, and the holes formed on the base fabric surface must be made extremely thin. The film is easily damaged due to abrasion, etc., and it is difficult to form the film itself uniformly and without unevenness, sometimes resulting in holes in the formed film.

Furthermore, conventional moisture-permeable waterproof fabrics do not have a moisture-absorbing function by themselves, and have the disadvantage of producing a sticky feeling upon contact.

The present invention involves impregnating fine gelatin powder and fine leather powder in the resin fabric of the laminate film that is laminated on the base fabric surface, and forming a film layer having a uniform thickness on the base fabric surface using this laminate film. Next, gelatin powder in the film impregnated and laminated on the base fabric surface is eluted with hot water or boiling water, thereby uniformly providing the impregnated film with countless fine pores having a generally uniform pore size,
Furthermore, the thickness of the film to be laminated is made particularly thin,
Moreover, by making the particle size of the gelatin powder contained in the film smaller than 8 microns, it is possible to provide a waterproof fabric with excellent moisture permeability and a feel close to that of leather upon contact. be.

(Means for Solving the Problems) In order to achieve the object L, in the moisture permeable waterproof fabric of the present invention, fine powdery gelatin particles and fine powdery A part or all of the gelatin particles in the resin film laminated on the surface of the base fabric are eluted with hot or boiling water to dissolve fine leather powder and innumerable fine particles. This method produces a moisture-permeable waterproof fabric having pores with a uniform pore size, and the thickness of the film interlayered on the base fabric of the moisture-permeable waterproof fabric is within 0.2 mm, and the adhesive film contains The gelatin particles to be produced have a particle size smaller than 8 microns.

(Function) In the moisture-permeable waterproof fabric of the present invention configured as described above, fine gelatin particles and leather powder are evenly and evenly contained in the laminate film that is attached to and laminated on the base fabric surface. to form and apply the film, then this application,
By eluting the gelatin particles from the laminated film with hot water or boiling water, pores with fine pore diameters are uniformly and evenly distributed in the laminated film containing leather powder.

In addition, the gelatin particles contained in the laminated film containing leather powder are attached to the base fabric surface and the film is thinner than 0.21, so that it does not have any negative effect on the leather powder mixed in. Easily eluted with warm or boiling water.

In addition, since the gelatin particles contained in the laminated film containing leather powder have a particle size smaller than 8 microns, the pore size of the pores on the film surface created by the elution of the gelatin particles is at most 8 microns. It is considered to be within microns.

(Example) Hereinafter, a typical example will be described in which details of the moisture permeable waterproof fabric according to the present invention are shown in the drawings.

In FIGS. 1 and 2, A is the base fabric constituting the moisture-permeable waterproof fabric, which is usually rayon, nylon, polyester,
Nonwoven fabrics, knitted fabrics, woven fabrics, etc. based on cotton, wool, and blended yarns thereof are used. B is a resin film laminated in a single layer on the surface of this base fabric A, and its thickness is 0.
．． Produced in a thinner state than 2ta@, usually 0.08
~0.007mm It is said to be extremely thin after i. The thickness of this laminate film B largely depends on the characteristics of the resin 1 used, but from the viewpoint of moisture permeability, it is set at 0.02 mm.
The ideal thickness is ~0.007 mm, and by making it thin like this, the gelatin particles 2 contained in the attached and laminated films can be easily eluted, and the gelatin particles 2 contained in the laminated film B can be easily eluted. It has the feature that the leather powder 3 is exposed from the surface of the laminate film B. In the resin l of this laminate film B, there are fine gelatin particles 2...2 and fine leather powder 3...3 having a particle size smaller than 8 microns (pm). include.

(In the case of elongated grains, the particle size in the present invention is measured by the shorter diameter.) Gelatin particles 2 contained in the laminate film B provided on the surface of the base fabric A in this way ... 2 is eluted in whole or in part by warm water or boiling water, and the eluted portion of gelatin particles 2 . Complex holes 4...4 are created in film B.

Further, as shown in FIG. 3, the above-mentioned gelatin particles 2 are placed on the surface of the film B laminated on the surface of the base fabric A,
A paint containing leather powder 3 is applied with a spray gun, roll or brush to form a coating 5, and the gelatin particles 2 contained in this coating film 5 are eluted to form a coating with film B. By using the membrane 5, it was possible to create a moisture-permeable waterproof fabric that is even more resistant to water pressure than the waterproof fabric of the above embodiments.

In addition, as a means of attaching and laminating the laminate film B to 2SiIOA, a laminate film B is formed on release paper by knife coating, and the laminate film B produced on this f11 pattern paper is transferred to the base fabric A. There are methods such as forming the film B separately and attaching it to the base fabric A.

In this method, the release paper 6 is prepared according to the characteristics of the resin l that produces the film B.
When the release paper is made of polyurethane, the surface of the release paper is often made of silicone or polypropylene.

In a typical embodiment of this method, the coating heads 7 are successively provided as 7a, 7b, and 7c to coat the laminate film B on the surface of the base fabric A in multilayers B+, B2.
．． It can be provided as shown in B3.

In this embodiment, a resin 1 such as a polyurethane resin solution containing gelatin particles 2 and leather powder 3 is attached to the release paper 6 in multiple layers, and this is dried one by one using dryers 8a and 8b before being transferred to the base fabric A. The release paper 6 is removed after the film is applied and dried using a dryer 80. However, before being transferred to the base fabric A, a dried laminate film with release paper is prepared, and this laminate film with release paper is separated. In some cases, it is attached and laminated to the base fabric A using an adhesive in the process. (Illustration omitted) Furthermore, the release paper 6 is immersed in a resin liquid for film forming, and the laminate film B is formed on the release paper 6 without using the coating heads 7a, 7b, and 7C. A good laminate film B can also be produced by a method in which an adhesion film of resin liquid is created and this adhesion film is transferred to the base fabric A.

In addition, when the laminate film B is made of a fluorine-based resin, it is possible to provide the surface of the base fabric A with excellent heat resistance, weather resistance, and abrasion resistance, and the above-mentioned gelatin particles 2 and
A film B is produced by attaching a fine powder of fluororesin containing leather powder 3 or a fluororesin paste dispersed in petroleum naphtha to the surface of release paper 6.

In addition, when the film B to be laminated in the above is multi-layered, the first layer B1 is a film layer having characteristics that are compatible with the base fabric A, and the second layer B2 is a film layer having characteristics that are compatible with the base fabric A, and the second layer B2 is a film layer having a porous function due to the gelatin particles 2. Ideally, the third layer B3 should be a surface protective layer. This surface protective layer B3 is made of 0.00?
The film layer is made up of the thickness of the front and back of the table, and by creating finer holes 4...4 in this, moisture permeability and #
It is possible to more effectively bring water-based properties to waterproof fabrics.

In addition, in the above, the laminate film B attached and laminated on the surface of the base fabric A is made of fluorine-based resin,
Polyacrylic resin, polyurethane resin, etc. are mainly used, but various other materials can be used depending on the purpose of the waterproof cloth.

In addition, the gelatin particles 2...2 used also contain a type of induced protein, commonly called glue, and mainly contain 2.
The particle size is from pm to 8#Lm, more ideally 3Bm.
It is desirable that the gelatin particles have a particle size in a smaller range than the above range.

The finer the hole 4, the finer and more complex the hole 4 can be created.

The leather powder 3 to be used next is a leather powder that has been subjected to a rolling treatment and has a particle size in a range of finer than 15 pm in a volume ratio of 80% or more of the total amount of leather powder, or 1
Leather powder having a particle size smaller than Bpm in a volume ratio of 85% or more of the total amount of leather powder is used.

In addition, as methods for pulverizing the gelatin particles 2...2 into particles having a particle size finer than 81 zm, there are two methods: drying gelatin and pulverizing the gelatin to a water content of 10 to 15% by weight; There is a method of crushing in a sufficiently swollen state. The gelatin particles 2 to be used, which have been pulverized by these pulverization methods, are prepared so as to have a moisture content of at least 4% by weight. The water content of the gelatin particles 2 has the advantage that the smaller the water content, the easier the gelatin can be pulverized. It has drawbacks that make it difficult to use, making it unsuitable for use.

Further, as methods for pulverizing the gelatin particles 2 without swelling, there are two methods: using a so-called dry pulverizer such as a jet mill, and pulverizing using a wet media pulverizer such as a ball mill using a solvent such as toluene. There is,
In either case, finely powdered gelatin particles 2 having a particle size of 8 uLm or less could be obtained. Furthermore,
゛The method of making gelatin in a double wet state, squirting it from a nozzle with high-pressure air toward the grinding surface, crushing it by impact crushing on the grinding surface, and drying this pulverized material also reduces the particle size. Finely powdered gelatin particles 2 with a particle diameter of 8 pm or less could be obtained.

Next, the leather powder 3 contained in the resin 1 is obtained by pulverizing shaving waste that has been rubbed, and leather powder that has not been rubbed is prone to mold and hardens when dried after steam heat treatment. Leather that has been treated with chrome, tannins, and other treatments is used because it cannot withstand use in other areas.

The leather powder 3 has a characteristic that the smaller the particle size, the smoother the surface of the laminate film B becomes. The leather powder 3 used there is ground by a grinder such as a jet mill into a fine leather powder in which the leather powder with a particle size in a range smaller than 15 JLm accounts for 80% or more of the total amount of leather powder by volume. use. Another method is to grind leather powder with a solvent such as toluene in a wet media mill.
The leather powder is used as a fine leather powder in which the leather powder with a particle size in a range smaller than pm accounts for at least 85% or more of the total amount of leather powder by volume.

In this way, the particle size is in a range finer than 8 pm,
In addition, gelatin particles 2 with a moisture content of approximately 10 to 15% by weight and the leather powder 3 crushed into fine powder are mixed with resin 1, and this is applied to the surface of release paper 6 to form a laminated film. This laminate film B is transferred onto the surface of the base fabric A and the release paper 6 is peeled off to form a waterproof fabric.

The method of mixing gelatin particles 2 and leather powder 3 into resin 1 is to make resin 1 into a resin liquid, resin solution, or resin emulsion state, and directly add gelatin particles 2 and leather powder 3 to this and stir and mix. In this case, gelatin particles 2 and leather powder 3 are added in advance to a solvent such as toluene and stirred to create a mixed liquid, and then resin 1 is dissolved in the mixed liquid. In addition, resin 1 is dispersed in petroleum naphtha. In some cases, it is made into a paste and kneaded into this, and in other cases, it is mixed into the fine powder of resin I. As a method for more reliable dispersion of the gelatin particles 2 and leather powder 3 into the resin 1 during such stirring and mixing, a solvent such as toluene, a resin liquid, a resin solution or m
Gelatin particles 2 and leather powder 3 are added to 1lW emulsion, and this is re-pulverized using a wet grinder such as a ball mill.
Alternatively, it is preferable to re-pulverize the gelatin particles 2 together with the fine powder of the resin 1 using a jet mill. When the gelatin particles 2 are re-pulverized using this method, the particle size of most of the gelatin particles 2 contained in the resin 1 is finer than 3 JLm. It is clear that it falls within this range. In particular, when the gelatin particles 2 are re-pulverized in a solvent such as toluene, the gelatin particles 2 are insoluble in the solvent, so there is no dissolution or swelling of the gelatin particles 2, and the re-pulverization is relatively easy. It was possible to produce gelatin particles 2 in which most of the particle sizes were in a range finer than 3 m.

Similarly, when a previously crushed leather powder was added to a solvent such as toluene, and this leather powder was re-pulverized in a ball mill, it contained a large amount of leather powder with a particle size smaller than 8 gm, and was found to contain a large amount of leather powder with a particle size smaller than 18 gm. It was possible to produce leather powder in which the leather powder with a particle size in a fine range accounts for 85% or more of the total amount of leather powder by volume.

The amount of gelatin particles 2 mixed into the resin 1 in the above depends on the degree of moisture permeability, waterproofness, weather resistance, etc. required for the laminate film B forming the surface of the base fabric A, and as the mixed amount increases, the permeability increases. Although the moisture property was improved, there was a tendency for the laminate film B to have problems such as tearing, damage due to abrasion, and peeling. or,
By increasing the amount of the leather powder 3 contained in the laminate film B.

The produced laminate film B has unique hygroscopicity and texture similar to leather, but on the other hand, if the amount of leather powder 3 contained in the laminate film B is too large, the surface of the produced laminate film B becomes rough. It tends to give a rough feeling.

It became clear that the tear strength of laminate film B was significantly impaired. For these reasons, in the examples, the amount of gelatin particles 2 contained in resin 1 was mixed in the range of 1 to 20 parts by weight and 1 to 30 parts by weight of leather powder 3 to 100 parts by weight of the resin compound. A laminate film B was thus formed. In another example, a toluene solution containing 30% by weight of polyurethane resin solids was prepared.
1 to 15 parts by weight of gelatin particles 2 and 1 to 3 per 0 g
0 parts by weight of leather powder 3 was mixed to form the laminate film B. In each of these examples, it was observed that the moisture permeability and waterproofness occurred depending on the amount of mixed gelatin particles 2. In particular, laminate film B using fluororesin and polyurethane resin has been found to have excellent weather resistance and abrasion resistance even when the thickness of film B is extremely thin. It is possible to provide a large number of holes.

The amount of gelatin particles 2 and leather powder 3 mixed with resin 1 in the above examples depends on the characteristics of resin 1 and the thickness of laminate film B created from resin 1, gelatin particles 2, and leather powder 3. , and the required water resistance, moisture permeability, texture, etc., and are not necessarily limited to the mixing ratios in the above examples.

The solvent used to dilute the resin 1 is selected as appropriate depending on the material of the resin 1, and typically includes methanol, isopropyl alcohol, and toluene, as well as toluene. Benzine alcohol, ethyl acetate, butyl acetate, acetone, methyl ethyl ketone,
Methyl isobutyl ketone, cyclohexane, tetrahydrofuran, dioxane, quidylol.

Dimethylformamide, 2-nitropropane, dichloramide, trichlorethylene, and various other solvents are used as practical solvents.

The laminate film B attached and laminated on the surface of the base fabric A by the above method is extremely thin with a thickness of 0.2 to 0.007 mm, and in order to obtain better moisture permeability, the laminate film B is 0.2 to 0.007 mm thick.
Ideally, the film should have a thickness of about 0.02 to 0.007 mm, and an extremely thin laminate film B of about 0.007+sm was formed using mainly polyurethane-based and fluorine-based resins.

In addition, most of the laminate films B attached and layered in this way are treated as resin skin layers because their surfaces are peelable surfaces from the template paper 6, and the gelatin described below is used as a skin layer. This will hinder the elution of particles 2, and the leather powder 3
This hinders the hygroscopicity of Therefore, the surface of the attached and laminated laminate film B is sanded or sandblasted to remove the resin skin layer that tends to be formed on the surface of the laminate film B, to facilitate the elution of the gelatin particles 2, and to make the gelatin particles 2 more easily eluted. To ensure that the laminate film B has the moisture absorption function of the powder 3.

The base fabric A on which the film B is laminated in this manner is soaked in hot water or boiling water at a temperature of 50°C to 100°C, and all or part of the gelatin particles 2...2 contained in the film B are removed. elute.

The higher the temperature of the hot water or boiling water used, the more effectively the gelatin particles 2...2 are eluted in a shorter time, but on the other hand, it may cause damage or deterioration of the base fabric A or the film B formed on the base fabric A. The setting of the temperature of the hot water or boiling water used and the setting of the soaking time depend on the material characteristics of the base fabric A.
It is necessary to decide as needed depending on the material characteristics, thickness, etc. of the film B to be laminated on the surface of the base fabric A. Further, the temperature setting and the crushing time setting are changed at any time depending on the extent to which the gelatin particles 2...2 contained in the film B are to be eluted.

This elution of the gelatin particles 2 is done to create fine pores 4 in the film B, but with the intention of making the created pores 4 finer or having a complicated curved shape, the film B is made into multiple layers. The gelatin particles 2 contained in the film B may be formed and subjected to the elution treatment described above so that a portion of 2° of the gelatin particles 2 is left.

In the embodiments in which Form B is laminated in multiple layers or in which a portion of gelatin particles 2 of 2° is left in the pores 4, the diameter of the pores 4 is finer than 51Lm, and most of them are 0.0Lm.
Pore diameters in the range of 5 to 3 Bm could be achieved.

From these examples, the degree of elution of gelatin particles 2 contained in film B is as follows:
It is determined by the degree of moisture permeability and water resistance required.

Furthermore, by leaving a portion of the gelatin particles 2 at 2° in the pores 4 created in the laminated film B, the pore diameter of the pores 4 is made relatively small, and by making the chain pores 4 complicatedly curved. It becomes possible to significantly limit the air permeability of the laminated film B, and as a result, a heat insulating effect can be provided to the laminated film B.

Furthermore, holes 4 created in the laminated film B
By leaving a portion of the gelatin particles 2 at 2°, the remaining portion of the gelatin particles 2 and the leather powder 3 provide a moisture absorbing function to the laminated film B, and as a result, the laminated film B The humidity adjusting function is provided to the film B.

In addition, if the gelatin particles 2 and leather powder 3 in the above are dyed in advance to the hue of the resin 1 constituting the laminate film B, the gelatin particles 2 are left in the film B without being eluted with the boiling water or warm water. However, even if a 2° portion of the gelatin particles 2 is left in the holes 4 to be formed, a laminate surface with a natural color tone can be produced.

(Effect) The moisture-permeable waterproof fabric according to the present invention has the above-described structure.
When forming the film B that is laminated on the surface of the film B, or the laminated film B, the following effects are brought about.

(1) Since the gelatin particles 2 contained in the resin 1 belong to a range finer than 8 gm, and the mixed main powder 3 is made into a fine powder, the film B to be laminated is
．． Even in the case of a thin laminated film of 2 layers or less, the mixed gelatin particles 2 and powder 3 will not stand out or protrude from the laminated film.
Therefore.

Even when the laminated film is as thin as 0.2 mm or less, it is possible to easily laminate the film B having a smooth surface with no missing parts on the film surface.

(2) In addition, by using gelatin particles 2 that belong to a range finer than 8 pm and setting the thickness of film B laminated to base fabric A to within 0.2++ m, the particles contained in laminated film B are The gelatin particles 2 are eluted smoothly and reliably, and fine uniform pores 4 can be created in the laminated film B by this elution process.

(3) Furthermore, since the pores 4 are created by the elution treatment after laminating the film B on the base fabric A, the adhesion and lamination of the uniform and extremely thin film B is simply a matter of the film B on the base fabric A. It can be produced only by laminating, and there will be no thin parts or holes in the attached and laminated film B.

(4) Film B laminated in this way is
Due to the gelatin particles 2...2 and the powder 3...3 contained in this laminate film B, the resin 1 constituting the film B has various foaming modes in which closed cells and open cells are mixed. It has a structure similar to that of foam material, and gives laminate film B its unique elasticity.

This also applies when the gelatin particles 2 contained in the laminated film B are left in the film B without being dissolved. This powder 3 has the characteristic of providing the laminated film B with unique stretchability and elasticity in a water-containing state.

(5) Also, 0.2mm to 0. OO? The desired amount of gelatin particles 2...2 can be uniformly included in the laminate film B having a uniform thickness of mm, and as a result, the laminate film with a uniform thickness has holes with a uniform distribution density of 1f. 4...4 can be produced, and it is possible to provide a waterproof fabric that has both the desired moisture permeability and waterproofness.

(6) Furthermore, in the moisture-permeable waterproof fabric formed in the above manner, the pores 4 formed in the laminate film B are smaller than 8 gm, and most of the pores 4 have a diameter smaller than 34 m.
This means that while it prevents water droplets with large particle sizes from passing through, it allows water vapor such as sweat emitted from the human body to pass through.

These things mean that the particle size of a normal rain droplet is 2000 g.
Even in drizzle with particularly fine particle size,
This is because the particle size of the water vapor is around 11001L, whereas the particle size of the moisture contained in water vapor is as small as 0.0004 pm.

(7) Film B is also laminated to a moisture-permeable waterproof fabric.
Since the pores 4 have a diameter smaller than 8 #Lm, the water pressure resistance is better than the moisture permeability achieved.

As a result of the above-mentioned effects, moisture buildup inside the waterproof fabric is effectively removed, moisture from rain etc. is prevented, and elasticity is brought to the laminate film B, making it suitable for use in various outdoor sports wear and work clothes. It can also be used for a wide variety of purposes, such as various rain gear.

[Brief explanation of the drawing]

FIG. 1 is an enlarged sectional view of the main part of the moisture-permeable waterproof fabric according to the present invention before gelatin elution, FIG. 2 is an enlarged sectional view of the main part after the gelatin has been eluted, and FIG. FIG. 4 is an enlarged sectional view of the main part of a waterproof fabric, FIG. 4 is an enlarged sectional view of the main part of a moisture-permeable waterproof fabric according to another embodiment, and FIG.
It is a schematic diagram showing an example. A...Base fabric, B...Film, 1...Resin, 2...
... Gelatin particles, 3... Hon powder, 4... Holes, 5...
・Coating film, 6...Release paper, 7...Coating head, 8...Dryer.

Claims (1)

[Claims] 1. The thickness of the resin film attached and laminated on the base fabric surface is 0.
The resin film is thinner than 2 mm and contains fine powder gelatin particles and fine powder leather powder in a range of finer than 8 microns, and at least a part of the gelatin particles in the impregnated film are heated in hot water or A moisture-permeable waterproof fabric characterized by being eluted with boiling water.