JPH01222938A - Moisture permeable waterproof fabric - Google Patents

Abstract

PURPOSE:To improve the moisture permeability can make the feel at touching agreeable by a method wherein finely powdered gelatin particles and finely powdered leatherdusts are added to resin film, which is formed on the surface of base fabric by application, and a part of or the whole gelation particles are eluted with hot water or boiling water. CONSTITUTION:As base fabric C consisting of moisture permeable waterproof fabric, normally non-woven fabric, braided fabric, woven fabric or the like made of yarn of rayon, nylon or the like and their mixed yarns is used. A resin film B, which is formed on the surface of the base fabric A, is 0.2mm or less in the thickness and contains resin 1, to which finely powdered gelatin particles 2 having a particle size smaller than 8mum and finely powdered leatherdusts 3 are added. The whole or a part of gelatin particles are eluted with hot water or boiling water, resulting in leaving the eluted part of the gelatin particles 2 in the shape of cavities, which form complicated holes 4 in the film B.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention provides a resin film coated on the surface of the base fabric, which contains fine leather powder and has a large number of fine pores, so that it feels good to the touch. To provide a moisture-permeable waterproof fabric that has a moisture-permeable function and also has a waterproof function.

(Prior art) Conventional moisture permeable waterproof fabrics are produced by forming a polyurethane or other resin film on the surface of a nylon base fabric, making this formed film extremely thin, and providing fine holes in the film. was. By setting the pore diameter of the resin 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 a fabric.

(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, which has a coating film of 0.5 to 5 pm as described above. It was necessary to create evenly distributed fine pores with different pore diameters.

It is technically difficult to uniformly and evenly create countless fine pores with pore diameters of around 0.5 to 54 m 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 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 film formed on the base fabric needs to be made extremely thin. It is easy to break due to wear and the like, and it is difficult to form the film itself uniformly and without unevenness, and sometimes holes are formed 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 coating film to be formed on the base fabric surface, and first forming a film on the base fabric surface with this resin coating liquid. Forms a coating film with uniform thickness on the surface,
Next.

By eluting the gelatin powder in the coated film formed on the surface of the base fabric with hot or boiling water, numerous fine pores with approximately uniform pore diameters are evenly formed in the coated film, and the thickness of the coated film is further reduced. The gelatin powder contained in the coated film has a particle size of 8.
By making the range finer than microns,
The purpose of the present invention is to provide a waterproof fabric that has superior moisture permeability and has a feel close to that of leather upon contact.

(Means for Solving the Problems) In order to achieve the above object, in the moisture permeable waterproof fabric of the present invention, a resin film coated on the surface of the base fabric contains fine gelatin particles and fine powder particles. By eluting some or all of the gelatin particles in the resin film formed on the surface of the base fabric with warm water or boiling water, the gelatin particles containing the fine powder and having countless fine pores are dissolved. The purpose is to create a moisture-permeable waterproof fabric that has holes evenly distributed, and the thickness of the coated film formed on the base fabric of the moisture-permeable waterproof fabric is 0.2 mm.
Moreover, the gelatin particles contained in the coated film are made to have a particle size finer than 8 microns.

(Function) In the moisture-permeable waterproof fabric of the present invention configured as described above, fine gelatin particles and main powder are uniformly and evenly contained in the coating formed on the surface of the base fabric. By forming a film and then eluting the gelatin particles from the formed coated film with warm water or boiling water, pores with fine pore diameters are uniformly and evenly distributed in the formed film containing this powder.

In addition, since the gelatin particles contained in the coating film containing this powder make the coating formed on the base fabric thinner than that of 0.2 fatty acid, they do not have any adverse effects on the powder. Easily eluted with warm or boiling water without any problem.

In addition, since the gelatin particles contained in the formed coating film containing this powder have a particle size smaller than 8 microns,
The diameter of the pores in the coated film created by the elution of the gelatin particles is at most 8 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 the figure, A is a base fabric constituting the moisture-permeable waterproof fabric, and typically nonwoven fabrics, knitted fabrics, woven fabrics, etc. based on rayon, nylon, polyester, single wool cotton, and blended yarns thereof are used. B is a resin film that is applied and formed on the surface of the base fabric A, and it is produced in a state where the thickness is thinner than 0.2s + 10cm, and it is usually around 0.08 to 0.007m thick. be done. The thickness of this formed skin@H largely depends on the characteristics of the resin used, but from the viewpoint of moisture permeability, it is
．． The ideal thickness is 0.02 to 0.007 mm, and by making the film thin like this, the gelatin particles 2 contained in the formed film can be easily eluted, and the powder 3 contained in the film B can be easily dissolved. It has the feature that it is exposed from the side of leather B. And this resin skin 11! In the resin l of iB, there are fine gelatin powder particles 2...2 and fine powder powder 3.
...3 are included. (In the case of elongated grains, the particle size in the present invention is measured by the shorter diameter.) The gelatin particles 2 contained in the resin film B provided on the surface of the base fabric A in this way ...2 with warm or boiling water,
All or part of it is eluted, and this gelatin particle 2...
・The eluted portion of 2 has a hollow shape as shown in Fig. 2, and this hollow portion forms complex pores 4 in the film B.
・4 is produced.

By the way, the resin 1 constituting the resin film B is mainly a synthetic resin material, and in consideration of weather resistance, abrasion resistance, etc. in an ultra-thin state, it is an acrylic resin, a -liquid type, or a two-liquid type. Polyurethane resin etc. are used as one of the most suitable.

In addition, the gelatin particles 2...2 used also contain a type of induced protein, commonly called glue, and mainly contain 2.
It consists of a particle size of ILm to 8ILm, more ideally 3J
It is desirable that the gelatin particles have a particle size in a range smaller than J and m, and the finer the gelatin particles, the more fine and complex pores 4 can be created.

Next, the main flour 3 to be used is a main flour that has been subjected to a rolling treatment and has a particle size in a range smaller than 15 gm in a volume ratio of 80% or more of the total amount of the main flour, or 1
The powder used is one containing 85% or more of the total amount of the powder by volume of the powder having a particle size smaller than 8 gm.

In addition, as methods for pulverizing the gelatin particles 2...2 into particles having a particle size finer than 8 gm, 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. and.

The gelatin particles 2 to be used, which have been made into fine powder by these pulverization methods, are prepared so as to have a water 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 ILm or less could be obtained. Furthermore.

The gelatin is made into a swollen state, and the gelatin is pulverized by blowing it out from a nozzle toward the pulverizing surface along with high-pressure air, causing impact crushing on the pulverizing surface, and then drying this pulverized product. It was possible to obtain gelatin particles 2 in the form of a fine powder.

Next, the main powder 3 contained in the resin 1 is obtained by pulverizing shaving waste etc. that have been subjected to a rolling treatment.

Leather that has not been rubbed is susceptible to mold and is hardened by drying after the heat treatment, making it unusable, so leather that has been rubbed with chromium, tannin, or other materials is used.

This powder 3 has a feature that the smaller the particle size, the smoother the surface of the formed film B becomes. The powder 3 used there is milled by a pulverizer such as a jet mill.
It is used by grinding into fine powder such that the powder has a particle size smaller than ILm and accounts for 80% or more of the total amount of powder by volume. Another method is to grind this powder with a solvent such as toluene in a wet media mill, etc. to obtain 18IL.
The fine powder is used so that the powder has a particle size smaller than m and accounts for at least 85% of the total amount of the powder by volume.

In this way, the particle size is finer than 81Lm.

The resin film B is applied to the base fabric using a coating liquid in which gelatin particles 2, which are present in the surrounding area and have a moisture content of approximately 10 to 15% by weight, and the above-mentioned powder 3, which has been ground into fine powder, are mixed with resin L. Form on side A.

The method of mixing gelatin particles 2 and main 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 main powder 3 to this and stir and mix. In some cases, the gelatin particles 2 and the powder 3 are added to a solvent such as toluene in advance, stirred to create a mixed solution, and then the resin 1 is dissolved in the mixed solution. As a method for more reliable dispersion of the gelatin particles 2 and powder 3 into the resin l through such stirring and mixing, gelatin particles 2 are added to a solvent such as toluene, a resin liquid, a resin solution, or a resin emulsion. It is preferable to add powder 3 and powder 3 and re-pulverize this using a wet grinder such as a ball mill. When the gelatin particles 2 were re-pulverized using this method, most of the gelatin particles contained in the resin 1 were crushed. It became clear that the particle size of the sample belonged to a range finer than 37 zm. In particular, gelatin particles 2 in a solvent such as toluene
As the gelatin particles 2 are insoluble in the solvent, there is no dissolution or up-up of the gelatin particles 2, and it is relatively easy to re-grind, and most of the particle sizes are smaller than 31Lm. It was possible to produce gelatin particles 2 that belong to the following.

In addition, in the same way, when the powder that had been pulverized in advance was added to a solvent such as toluene, and this powder was re-pulverized in a ball mill, it contained a large amount of powder with a particle size finer than 8 gm, and was smaller than 18 pm. It was possible to obtain a main powder in which the main powder with a particle size in a fine range accounts for 85% or more of the total amount of the main powder in terms of volume ratio.

Next, the coating B can be formed on the base fabric A by various methods, such as coating with a brush or roll, dipping, and spraying. In the example, when film B was formed directly on the surface of base fabric A using doctor knife coating, it was 0.007 m+
Good skin 119B around s was made. Also, when coating B was similarly created on the surface of base fabric A using a spray gun, there was some variation in thickness (approximately 0.0).
A good film B of around 07m+e was produced.

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 film B to be coated, and as the amount mixed increases, the moisture permeability becomes better. On the other hand, there was a tendency for the film B to suffer from problems such as tearing, damage due to abrasion, and peeling. In addition, by increasing the amount of the powder 3 contained in the film B, the film B produced has a unique hygroscopicity and texture similar to leather, but on the other hand, the amount of the powder 3 contained in the film B is It has become clear that when the amount is too large, the surface of the resulting film B tends to have a rough feel due to roughness, and the tear strength of the film B is significantly impaired. Based on these facts, in the examples, the amount of gelatin particles 2 contained in resin 1 is in the range of 1 to 20 parts by weight and 1 to 30 parts by weight of gelatin particles 2 and 1 to 30 parts by weight, per 100 parts by weight of the resin powder. Coating B was formed by mixing. In another example, 1 to 15 parts by weight of gelatin particles 2 and 1 were added to 100 parts of a toluene solution containing 30% by weight of polyurethane resin solids.
~30 parts by weight of this powder 3 was mixed to form film B.

In all of these examples, it is recognized that moisture permeability and waterproofness occur depending on the amount of mixed gelatin particles 2, and in particular, in film B using polyurethane resin, the thickness of film B was extremely thin. Even in this case, excellent weather resistance and abrasion resistance are observed, and it is possible to provide a large number of fine pores formed by the gelatin particles 2.

In addition, the amount of gelatin particles 2 and main powder 3 mixed with resin 1 in the above example is determined by the characteristics of resin 1 and the coating liquid made of resin 1, gelatin particles 2, and main powder 3. It is naturally specified by the thickness of the film B, the required water resistance, moisture permeability, texture, etc.
It is not necessarily limited to the mixing ratio of the above embodiments.

The solvent used to dilute the resin 1 is selected as appropriate depending on the material of the resin 1, and usually includes methanol, isopropyl alcohol, in addition to toluene. Benzine alcohol, ethyl acetate, butyl acetate, acetone, methyl ethyl ketone,
Various solvents such as methyl isobutyl ketone, cyclohexane, tetrahydrofuran, dioxane, quidyol, dimethylformamide, 2-nitropropane, dichloramide, trichlorethylene, and others are used as practical solvents.

The film B coated and formed on the surface of the base fabric A by the above method is 0.
It is extremely thin with a thickness of 2 to 0.007 mm, and has a thickness of 0.02 to 0.00 mm for the purpose of obtaining better moisture permeability.
? The ideal thickness is around +a11, and using mainly polyurethane resin, it is 0.007 +++
An extremely thin film B of around m was formed.

Incidentally, in many cases, the surface of the film B formed by coating in this manner is a resin skin layer, which hinders the elution of the gelatin particles 2 described below, and also prevents the main powder 3 from dissolving.
may impede its hygroscopicity. Therefore, the surface of the coated film B is sanded or sandblasted to remove the resin skin layer that tends to form on the surface of the film B, to facilitate the elution of the gelatin particles 2, and to make it easier for the gelatin particles 2 to dissolve. To ensure that film B has a moisture absorption function.

The base fabric A on which the film B was formed in this way was heated at 50°C to 1°C.
All or part of the gelatin particles 2...2 contained in the film B are eluted by immersion in warm water or boiling water at 00°C.

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 temperature setting of the hot water or boiling water used and the setting of the soaking time are determined at any time depending on the material characteristics of the base fabric A and the material characteristics, thickness, etc. of the film B formed on the surface of the base fabric A. There is a need. Also, are the temperature settings and soaking time settings based on the gelatin particles contained in film B?
. . .2 may be changed at any time depending on the extent to which 2 is to be eluted.

This elution of the gelatin particles 2 is performed to create narrow pores 4 in the skin 111B, but in order to make the created pores 4 finer or have a complicated curved shape, gelatin particles 2 are dissolved in the film B. Part 2 of gelatin particles 2
The elution process described above may be performed in such a way as to leave behind.

In the example in which a portion of 2° of the gelatin particles 2 is left in the pores 4, the diameter of the pores 4 is finer than 51 Lm, and most of the pores have a diameter in the range of 0.5 to 3 pm. We were able to.

From the above example, gelatin particles 2 contained in film B
The degree of elution is determined by the degree of moisture permeability and water resistance required of this film B.

Also, by leaving a portion of the gelatin particles 2 at 2° in the pores 4 created in the film B, the pore diameter of the pores 4 can be made relatively small.
By making the wire holes 4 bend in a complicated manner, the air permeability of the film B can be significantly restricted, and as a result, the film B can have a heat insulating effect.

Furthermore, by leaving a 2° portion of the gelatin particles 2 in the pores 4 created in the film B, the remaining gelatin particles 2
A part of 2° and this powder 3 bring moisture absorption function to the film B,
As a result, film B is provided with a humidity regulating function.

In addition, by pre-dying the gelatin particles 2 and powder 3 in the above to the hue of the resin 1 constituting the film B, even if the gelatin particles 2 remain in the film B without being eluted with the boiling water or hot water. Furthermore, even if a 2° portion of the gelatin particles 2 is left in the pores 4 to be formed, it is possible to create a film surface with a natural color tone.

(Effect) The moisture-permeable waterproof fabric according to the present invention has the above-described structure.
The following effects are brought about upon the formation of the film B formed on the surface of the film or the formed film B.

(1) Since the gelatin particles 2 contained in the resin 1 belong to a range finer than 81 Lm, and the mixed main powder 3 is made into a fine powder, the formed film B is coated with a thin coating of 0.2 μm or less. Even when a film is formed, the mixed gelatin particles 2 and powder 3 do not stand out or protrude from the formed coating film. Therefore, even when a thin coating film of 0.2 mm or less is formed, there are no missing parts in the coating film. A skin IIIB with a smooth surface free of blemishes can be easily produced.

(2) Furthermore, by using the gelatin particles 2 which belong to a range finer than 81Lm and by setting the thickness of the coating B coated on the base fabric A to be within 0.2+sm, the particles contained in the coating B are The gelatin particles 2 are eluted smoothly and reliably, and fine and uniform pores 4 can be created in the film B by this elution treatment.

(3) Furthermore, since the pores 4 are created by the elution treatment after coating and forming the coating B on the base fabric A, the formation of a uniform and extremely thin coating n*H is achieved by applying the coating liquid to the base fabric A. It can be produced by simple application, and the produced film B does not have thin parts or holes.

(4) Film B created in this way is composed of gelatin particles 2...2 and main powder 3.
. . 3, the resin 1 constituting the coating B has a structure similar to various foam materials in a mixed form of closed cells and open cells, giving the skin MB its unique elasticity. This also applies to the case where the gelatin particles 2 contained in the coating B are not eluted and remain in the coating B, and in this way, the gelatin particles 2 remaining in the coating 11iH and the main powder are No. 3 has the feature of providing the formed film B with specific stretchability and elasticity in a water-containing state.

(5) Also, a desired amount of gelatin particles 2...
2 can be uniformly included, and as a result, pores 4...4 can be created with a uniform distribution density in a film of uniform thickness, and the desired moisture permeability and waterproofness can be achieved. It is possible to provide a waterproof fabric that has both of these features.

(6) Furthermore, in the moisture-permeable waterproof fabric formed above, skin II
The holes 4 formed in IB are finer than 81Lm, and most of them are smaller in diameter than 3JLm, which prevents large-sized water droplets from passing through. One of its features is that water vapor such as sweat emitted from the human body can pass through it.

These things mean that the particle size of a normal rain droplet is 20,001 Lm.
This is because the particle size of water vapor is as small as 0.00041 Lm, while the particle size of fine rain is around 100 #Lm.

(7) Also, the holes 4 of the film B formed on the moisture-permeable waterproof fabric are 8
Since the pore diameter is smaller than #Lm, it has a feature that 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 provided to the film B, so it can be used for various outdoor sports wear and work clothes. It can be used for a wide range 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 is eluted, and FIG. 2 is an enlarged sectional view of the main part after the gelatin is eluted. A... Base fabric, B... Film, ■... Resin, 2...
Gelatin particles, 3... main powder, 4... pores.

Claims (1)

[Claims] 1. The thickness of the resin film applied to the base fabric surface is 0.2 m.
m, and the resin film 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 formed film is heated or A moisture-permeable waterproof fabric characterized by being eluted with boiling water.