JPH05222677A - Coated cloth and its production - Google Patents

Abstract

PURPOSE:To provide a coated cloth having excellent moisture-permeability and waterproofness and provide a process for producing the cloth. CONSTITUTION:The objective coated cloth is produced by the wet coating of a cloth with a synthetic polymer solution composed mainly of a polyurethane resin containing >=1% of essentially non-porous inorganic fine powder having an average particle diameter of <=0.1mum and composed of one or more compounds selected from silicon compound, magnesium compound, etc. The coated cloth has excellent moisture-permeability and waterproofness as well as high abrasion resistance and peeling resistance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating cloth excellent in moisture permeability and waterproofing, which is used for various kinds of clothes such as rain clothes and outer clothes, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, it has been known that a coating cloth obtained by a wet or dry coating processing method has a resin layer with a hole and a resin layer without a hole. Generally, when the resin layer is perforated, excellent moisture permeability is easily obtained, but waterproof performance tends to be insufficient. Conversely, when the resin layer is non-perforated, excellent waterproof performance is easily obtained, but moisture permeability is Performance tends to be insufficient. For example, the coating cloth obtained by the wet coating method of polyurethane resin has originally excellent waterproof performance, but since the moisture permeability is insufficient, in order to improve the moisture permeability, an anionic surfactant and a nonionic surfactant are used. It is usual to use a surfactant, hydrophilic polymer, etc. together. However, the moisture permeability of the obtained coated fabric is not sufficient, and the waterproof performance is considerably deteriorated, and as a result, both cannot satisfy the sufficient performance.

In recent years, for the purpose of compensating for both defects, a highly moisture-permeable resin layer having pores is first formed on a fiber cloth, and then a resin layer having no pores is formed on the resin layer to obtain excellent moisture permeability. Although a method of obtaining performance and waterproof performance has been attempted, even with this method, even when a thin non-porous resin layer is applied, the moisture permeability is extremely lowered,
As a result, it is currently difficult to achieve both excellent moisture permeability and waterproof performance. Further, in this case, coating is performed twice, which is also disadvantageous in terms of processing cost.

On the other hand, in JP-A-58-4873 and JP-B-62-53632, a polyurethane resin film containing porous particles containing silicon dioxide as a main component is formed, and then a perfluoroalkyl group is added. A processing method has been proposed in which a water-repellent agent is added to obtain a moisture-permeable waterproof cloth, but none of them has sufficient moisture permeability.

Further, Japanese Patent Application Laid-Open No. 2-251672 discloses that it has fine pores smaller than 150Å and has a surface area of 20.
A method of processing a polyester coating fabric with a resin layer in which inorganic porous particles of 0 m ² / g or more, such as silicon dioxide and titanium oxide, are layered and dispersed in a high concentration has been proposed. It only prevents migration of the dye, and does not have sufficient moisture permeability.

[0006]

The present invention has been made in view of the above circumstances, and an object thereof is to obtain a coating cloth having both excellent moisture permeability and waterproof performance.

[0007]

SUMMARY OF THE INVENTION The present invention achieves the above object and has the following configuration. That is, the present invention provides that “a porous resin layer made of a synthetic polymer mainly composed of a polyurethane resin is provided on a fiber cloth, and the resin layer is substantially non-porous and has an average particle size of 0.1 μm or less. 1% powder
"Coating fabric with excellent moisture permeability and waterproof performance, characterized by having a moisture permeability of 6000 g / m ² · 24 hrs or more and a water pressure resistance of 0.6 kg / cm ² or more" and "fiber fabric, A polyurethane polymer-based synthetic polymer solution containing substantially no pores and an inorganic fine powder having an average particle size of 0.1 μm or less in an amount of 1% or more based on the resin solid content is applied, and then immersed in water to dilute the resin content. A method for producing a coated fabric having excellent moisture permeability and waterproof performance, which is characterized by performing wet coagulation ".

The present invention will be described in detail below.
The coating fabric of the present invention is characterized in that a fine inorganic powder is uniformly dispersed and applied in a polar organic solvent solution of a synthetic polymer mainly composed of polyurethane resin and then immersed in water to form a resin film, that is, a so-called wet coating. A method for producing a fine, highly moisture-permeable resin layer with a large number of pores on a fibrous fabric as a base fabric, which is manufactured by the method, without deteriorating the waterproof performance originally possessed by a polyurethane resin-based synthetic polymer. is there.

The substantially non-porous inorganic fine powder used in the present invention includes silicon compounds such as silicon dioxide, silicon carbide and silicon nitride, magnesium compounds such as magnesium oxide, magnesium hydroxide and magnesium sulfate, or particles thereof. At least one of the surface modified products is used, and among them, silicon dioxide produced by a dry method is most effective as a fine powder having substantially no pores.

The size of the inorganic fine powder used is required to have an average particle size of 0.1 μm or less, and a particle size of 0.05 μm or less is more preferable in terms of effects. Particle size is 0.1
If it is larger than μm, the pore size of the moisture permeable membrane of the obtained coating fabric becomes too large, and the waterproof performance is deteriorated, which is not preferable.

It is necessary that the inorganic fine powder is uniformly contained in the resin layer composed of a synthetic polymer mainly composed of polyurethane resin in an amount of 1% or more, more preferably 3%.
The above is good. When it is less than 1%, the number of pores of the moisture permeable membrane of the obtained coated fabric is small, and high moisture permeability cannot be obtained.

The fiber cloth used in the present invention includes polyamide synthetic fibers represented by nylon 6 and nylon 66, polyester synthetic fibers represented by polyethylene terephthalate, polyacrylonitrile synthetic fibers,
Woven and knitted fabrics made of polyvinyl alcohol synthetic fibers, semi-synthetic fibers such as triacetate, or mixed fibers such as nylon 6 / cotton, polyethylene terephthalate / cotton, etc.
Nonwoven fabrics and the like can be mentioned.

In the present invention, the above fiber cloth may be treated with a water repellent agent. This is one means for preventing the penetration of the resin solution into the fabric. In this case, the water repellent may be a known one such as a paraffin water repellent, a polysiloxane water repellent, and a fluorine water repellent, and the treatment thereof is generally performed such as padding method and spray method. The known method may be used. When particularly good water repellency is required, a fluorine-based water repellent is used, for example, Asahi Guard 730 (fluorine-based water repellent Emulsion, manufactured by Asahi Glass Co., Ltd.) in a 5% aqueous dispersion. Padding (drawing ratio 35
%) And then heat treatment at 160 ° C. for 1 minute.

In the coating cloth of the present invention, a synthetic polymer solution mainly composed of a polyurethane resin containing inorganic fine powder is applied onto the above-mentioned fiber cloth by a wet coating method. The synthetic polymer mainly composed of polyurethane resin as used herein means one containing 50 to 100% of a polyurethane component, and other synthetic polymers include, for example, polyacrylic acid, polyvinyl chloride, polystyrene, polybutadiene, polyamino acid, etc. Or their copolymers may be contained in the range of less than 50%.

Polyurethane resin is a copolymer obtained by reacting polyisocyanate and polyol,
As the isocyanate component, aromatic diisocyanate,
Using aliphatic diisocyanates and alicyclic diisocyanates alone or in a mixture thereof, for example, trilene
2,4-diisocyanate, 4,4'-diphenylmethane diisocyanate, 1,6-hexane diisocyanate, 1,
4-cyclohexane diisocyanate, etc.,
Polyether polyol and polyester polyol are used as the polyol component, polyethylene glycol, polypropylene glycol, polytetramethylene glycol and the like are used as the polyether polyol, and diols such as ethylene glycol and propylene glycol and adipic acid and sebacine are used as the polyester polyol. 2 such as acid
A reaction product with a basic acid or a ring-opening polymer such as caprolactone is used.

The above-mentioned polyurethane polymer-based synthetic polymer solution containing the inorganic fine powder may be appropriately coated using a conventional coating method, for example, a knife coater, a comma coater, a reverse coater or the like. In order to obtain a water pressure resistance of 0.6 kg / cm ² or more, the smoothness and air permeability (JIS L-
1096 method) by different, generally resin film weight 5 g / m ² or more, may preferably carry out the coating by adjusting the coating amount to be 10 g / m ² or more.

In the present invention, for the purpose of improving the peeling resistance between the resin layer and the fiber cloth, a compound having a high affinity for the resin or the fiber cloth may be used in combination, and an isocyanate compound may be used in combination as the compound. .. As the isocyanate compound, 2,4-tolylene diisocyanate, diphenylmethane diisocyanate, isophorone diisocyanate, hexamethylene isocyanate or a compound containing 3 mol of these diisocyanates and active hydrogen (eg, trimethylolpropane, glycerin, etc.) 1 Triisocyanates obtained by addition reaction with moles can be used. The above-mentioned isocyanates may be in a form in which an isocyanate group is released, or in a form in which a block is dissociated by a subsequent heat treatment after being stabilized by adding phenol, methylethylketoxime or the like. However, it can be used, and it may be appropriately used depending on workability and purpose.

The amount of the isocyanate compound used is preferably 0.1 to 10% by weight based on the synthetic polymer mainly composed of the polyurethane resin.
If the amount used is less than 0.1%, the adhesive force of the resin layer to the fabric is low, and if it exceeds 10%, the texture tends to harden, which is not preferable.

After the resin liquid consisting of the above-mentioned polyurethane-based synthetic polymer is applied to the fiber cloth, in the present invention,
The resin component is wet-solidified by immersing it in water at 30 ° C. for 0.5 to 10 minutes. Thereafter, after washing in warm water of 40 to 60 ° C. for 5 to 15 minutes, it is dried by a usual method.

In the present invention, for the purpose of further improving waterproofness, the coating fabric may be subjected to a water repellent treatment after the wet coating. For the water repellent treatment, a publicly known well-known water repellent treatment method as described above may be adopted.

[0021]

[Working] The coating fabric of the present invention has an excellent permeability by containing inorganic fine powder having substantially no pores and an average particle size of 0.1 μm or less in the resin layer of a synthetic polymer mainly composed of polyurethane resin. It is a product that has been given wet performance and waterproof performance. It is not clear why it is possible to obtain both excellent moisture permeability and waterproof performance by including an inorganic fine powder having an average particle size of 0.1 μm or less, but the present inventors presume as follows. ing.

That is, it is substantially non-porous and has an average particle size of 0.1.
When wet-coagulation is performed by coating a cloth with a synthetic polymer solution consisting mainly of a polyurethane resin in which inorganic fine powder of μm or less is uniformly dispersed, the polyurethane resin forms its unique porous structure, and at the same time, the inorganic fine particles are contained in the solution. Since the powder is uniformly micro-dispersed, a slight deviation in the solidification rate occurs at the interface between the inorganic fine powder and the resin that is about to solidify, and as a result, the moisture permeability is greatly improved without reducing the waterproof performance. It is presumed that it becomes possible to provide a large number of fine pores having a size of 0.1 μm or less.

In the present invention, since the moisture permeation performance is improved by the formed fine perforations, a problem peculiar to the highly moisture-permeable waterproof fabric is likely to occur when pressure is applied during wearing,
It is also very effective against water leakage. Furthermore, since the inorganic fine powder of the present invention is evenly present from the surface layer to the lower layer of the resin layer, the surface of the resin layer eliminates the slimy feeling peculiar to the polyurethane resin and makes dry touch, and at the same time, the resistance of the entire resin layer is improved. Abrasion resistance and adhesive strength are improved.

[0024]

EXAMPLES The present invention will be described in more detail with reference to the following examples. The performance of the coated fabric in the examples was measured by the following method. (1) Water pressure resistance JIS L-1092 (high water pressure method) (2) Water vapor permeability JIS L-1099 (A-1 method) (3) Water leakage Performed according to the Bundesmann method (L-1092 reference test method), Measure the amount of water leakage after 60 minutes. (4) Abrasion strength JIS L-1084 (method A-1) (5) Peel strength A hot melt tape was adhered to the coating surface in the longitudinal direction, and measured according to JIS L-1089 method.

Example 1 Nylon high multifilament 7 for both warp and weft
Weaving a plain woven fabric with a warp density of 120 yarns / inch and a weft yarn density of 90 yarns / inch using a 0 denier 68 filament,
After performing scouring and dyeing (manufactured by Mitsubishi Kasei Co., Ltd., acid dye Diacid Fast Red 3BL 2% owf) in the usual way,
Asahi guard 710 (made by Asahi Glass Co., Ltd.) of fluorine-based water repellent Emulsion is padded with a 5% aqueous solution (squeeze ratio 35
%) And dried, and then heat-treated at 160 ° C. for 1 minute.
Next, using a calendering machine having a mirror-finished roll, calendering was carried out under conditions of a temperature of 170 ° C., a pressure of 30 kg / cm ² and a speed of 20 m / min to obtain a base fabric for coating.

Here, a polyurethane resin solution having a composition shown in the following formulation 1 and a solid content concentration of 25% was applied to the calender surface of the base cloth with a knife over roll coater in an amount of 8
Immediately after application at 0 g / m ² , it is immersed in water at 15 ° C for 1 minute to solidify the resin component, followed by washing in warm water at 50 ° C for 10 minutes and drying to obtain an inorganic fine powder. 11%
The containing resin layer was formed.

Prescription 1 Resamine CU-4550 100 parts (Dainichi Seika Kogyo Co., Ltd., ester type polyurethane resin) Resamine X 1 part (Dainichi Seika Kogyo Co., Ltd., isocyanate compound) N / N-dimethylformamide 25 parts Aerosil # 130 3 parts (Nihon Aerosil Co., Ltd., Si with an average particle size of 16 nm
O ₂ powder)

Next, in order to make the coated surface water-repellent with a gravure coater, gravure coating was performed with a 5% aqueous solution of Asahi Guard 710, followed by squeezing with a mangle (squeeze ratio of 40%) and drying, followed by 1 ° C at 160 ° C. Heat treatment for a minute,
A coating fabric of the present invention was obtained.

For comparison with the present invention, a comparative coating fabric (referred to as Comparative Example 1) was obtained in the same manner as in this Example except that Aerosil # 130 was omitted from Formulation 1 in this Example. .. Further, for comparison with the present invention, in the formulation 1 of this example, the same amount of Nipsil VN3 (manufactured by Nippon Silica Industry Co., Ltd., wet method microporous SiO ₂ powder having an average particle size of 16 nm) was used instead of Aerosil # 130. A coating fabric for comparison (referred to as Comparative Example 2) was obtained by the same method as in this example except that it was used.

The performances of the coating fabrics of the present invention and Comparative Examples 1 and 2 were measured and evaluated, and the results are shown in Table 1.

[0031]

[Table 1]

As is clear from the results shown in Table 1, the coating fabric of the present invention has excellent water pressure resistance and moisture permeability, and is also effective against the drawback of water leakage which the conventional highly moisture permeable waterproof fabric has. It is also understood that the wear resistance and peeling resistance are also good.

Example 2 A coating fabric of the present invention was obtained in the same manner as in Example 1 except that the following formulation 2 was used in place of the formulation 1 of the coating liquid in the above example 1. The inorganic fine powder content of the coating resin layer was 17%.

Formulation 2 Resamine CU-4550 75 parts (Dainichi Seika Kogyo Co., Ltd., ester type polyurethane resin) PAU-3 25 parts (Mitsubishi Kasei Co., Ltd., polyamino acid urethane resin) Resamine X 1 part (Dainichi Seika) Industrial Co., Ltd., isocyanate compound) N · N-dimethylformamide 25 parts Magnesia 100B 5 parts (Ube Chemical Co., Ltd., average particle size 10-20 nm MgO fine powder)

For comparison with the present invention, a comparative coating fabric (referred to as Comparative Example 3) was obtained in the same manner as in this Example except that Magnesia 100B was omitted from Formulation 2 in this Example.

The performances of the coating fabrics of the present invention and Comparative Example 3 were measured and evaluated, and the results are shown in Table 2 together.

[0037]

[Table 2]

As is clear from the results shown in Table 2, the coating fabric of the present invention has excellent water pressure resistance and moisture permeability and is also effective against water leakage, which is a drawback of the highly moisture permeable waterproof fabric. It is also found that the wear resistance and peeling resistance are also good.

[0039]

According to the method of the present invention, it is possible to obtain a coated cloth having excellent moisture permeability and waterproof performance. Further, the coating fabric of the present invention is excellent in abrasion resistance and peeling resistance of the coating resin layer. According to the present invention, since high performance can be obtained in terms of both moisture permeability and waterproofness only by wet coating, it can be manufactured at low cost, which is very advantageous in industry. The coating fabric of the present invention is a material suitable for apparel such as rain clothes and outer garments because of its excellent performance.

Claims (2)

[Claims] 1. An inorganic fine powder having a porous resin layer made of a synthetic polymer mainly composed of polyurethane resin on a fiber cloth, the resin layer being substantially non-porous and having an average particle size of 0.1 μm or less. 1
%, More than 6000 g / m ² · 24 hrs moisture permeability and 0.6 kg / cm ² or more water pressure resistant coating fabric with excellent moisture permeability and waterproof performance. 2. A fiber cloth having substantially no pores and an average particle size of 0.
Apply a synthetic polymer solution mainly composed of polyurethane resin containing 1% or more of inorganic fine powder of 1 μm or less with respect to resin solid content,
A method for producing a coating fabric having excellent moisture permeability and waterproofing properties, which comprises immersing the resin component in water for wet coagulation.