JP2951442B2 - Coating fabric and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coated fabric having excellent moisture permeability and waterproofness used for various types of clothing such as raincoats and outer garments, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, coated fabrics obtained by a wet or dry coating method are known to have a resin layer having a hole and a resin layer having no hole. In general, when the resin layer is perforated, excellent moisture permeability is easily obtained, but the waterproof performance tends to be insufficient. Conversely, when the resin layer is non-porous, excellent waterproof performance is easily obtained, but moisture permeability is easily obtained. Performance tends to be insufficient. For example, a coated fabric obtained by a wet coating method of a polyurethane resin has excellent waterproof performance from the beginning, but has insufficient moisture permeability. Therefore, to improve moisture permeability, an anionic surfactant and a nonionic surfactant are used. Usually, a surfactant, a hydrophilic polymer or the like is used in combination. However, the moisture permeability of the obtained coated fabric is not sufficient, and the waterproof performance is considerably reduced. As a result, both cannot satisfy the sufficient performance.

In recent years, for the purpose of compensating for the disadvantages of both, a porous high moisture permeable resin layer is first formed on a fiber cloth, and then a non-porous resin layer is formed on the resin layer to obtain an excellent moisture permeable resin layer. Attempts have been made to obtain high performance and waterproof performance, but even with this method, even if a non-porous resin layer is applied thinly, the moisture permeability is extremely reduced.
As a result, it is difficult at present to achieve both excellent moisture permeability and waterproof performance. In this case, coating is performed twice, which is disadvantageous in terms of processing cost.

On the other hand, JP-A-58-4873 and JP-B-62-53632 disclose a method of forming a polyurethane resin film containing porous particles mainly composed of silicon dioxide, and then forming a perfluoroalkyl group. There has been proposed a processing method for obtaining a moisture-permeable waterproof fabric by imparting a water-repellent agent, but none of the methods has provided sufficient moisture-permeable performance.

Further, Japanese Patent Application Laid-Open No. Hei 2-251672 discloses that a micropore having a diameter of less than 150.degree.
There has been proposed a method for processing a polyester-coated fabric in which a resin layer in which inorganic porous particles such as silicon dioxide and titanium oxide of 0 m ² / g or more are dispersed in a high concentration in a layered manner is interposed. It merely prevents the dye from migrating and does not provide sufficient moisture permeability.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and has as its object to obtain a coated fabric having both excellent moisture permeability and waterproofness.

[0007]

The present invention attains the above object and has the following constitution. That is, the present invention relates to a "porous resin layer made of a synthetic polymer mainly composed of a polyurethane resin on a fiber cloth, and a substantially nonporous inorganic fine particle having an average particle diameter of 0.1 μm or less in the resin layer. 1% powder
A coating cloth excellent in moisture permeability and waterproofness 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“ A synthetic polymer solution mainly composed of a polyurethane resin containing at least 1% of inorganic fine powder having an average particle size of 0.1 μm or less with respect to the solid content of the resin, which is substantially non-porous, is applied. "A method for producing a coated fabric having excellent moisture permeability and waterproofness, characterized by performing wet coagulation".

Hereinafter, the present invention will be described in detail.
The feature of the coating fabric of the present invention is a so-called wet coating in which inorganic fine powder is uniformly dispersed and applied in a polar organic solvent solution of a synthetic polymer mainly composed of a polyurethane resin, and then immersed in water to form a resin film. To obtain a fine, highly porous resin layer with a large number of pores on the fiber cloth which is the base fabric, without reducing the inherent waterproof performance of the synthetic polymer mainly composed of polyurethane resin. is there.

Examples of the substantially non-porous inorganic fine powder used in the present invention include silicon compounds such as silicon dioxide, silicon carbide and silicon nitride, magnesium compounds such as magnesium oxide, magnesium hydroxide and magnesium sulfate, and particles thereof. At least one of the surface modified products is used. Among them, silicon dioxide produced by a dry method is most effective as a substantially non-porous fine powder.

The size of the inorganic fine powder to be used needs to have an average particle size of 0.1 μm or less, and if it is 0.05 μm or less, it is more preferable in view of the effect. Particle size is 0.1
If it is larger than μm, the pore size of the moisture-permeable membrane of the obtained coated fabric is too large, and the waterproof performance is undesirably reduced.

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

The fiber fabric 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,
Fabrics and knits made of semi-synthetic fibers such as polyvinyl alcohol synthetic fibers and triacetate, or mixed fibers of nylon 6 / cotton, polyethylene terephthalate / cotton, etc.
Nonwoven fabrics and the like can be mentioned.

In the present invention, the above-mentioned fiber cloth which has been subjected to a water repellent treatment may be used. This is one means for preventing the permeation of the resin solution into the fabric. The water repellent in this case may be a known one such as a paraffin-based water repellent, a polysiloxane-based water-repellent, a fluorine-based water-repellent, etc., and the treatment is generally performed by a padding method, a spray method, or the like. May be performed by a known method. 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.) is used in a 5% aqueous dispersion. Padding (aperture 35
%), A heat treatment at 160 ° C. for one minute may be performed.

In the coating fabric 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 fabric by a wet coating method. The term "synthetic polymer mainly composed of a polyurethane resin" as used herein means a polymer containing 50 to 100% of a polyurethane component. Examples of other synthetic polymers include polyacrylic acid, polyvinyl chloride, polystyrene, polybutadiene, and polyamino acid. Or a copolymer thereof or the like in a range of less than 50%.

The polyurethane resin is a copolymer obtained by reacting a polyisocyanate and a polyol,
As an isocyanate component, aromatic diisocyanate,
Using aliphatic diisocyanate and alicyclic diisocyanate alone or a mixture thereof,
2,4-diisocyanate, 4,4'-diphenylmethane diisocyanate, 1,6-hexane diisocyanate,
Using 4-cyclohexane diisocyanate, etc.
Polyether polyols and polyester polyols are used as polyol components. Polyether polyols use polyethylene glycol, polypropylene glycol, polytetramethylene glycol and the like, and polyester polyols include diols such as ethylene glycol and propylene glycol and adipic acid and sebacin. 2 such as acid
A reaction product with a basic acid or a ring-opening polymer such as caprolactone is used.

The above-mentioned synthetic polymer solution mainly composed of a polyurethane resin containing inorganic fine powder may be appropriately coated by a usual coating method, for example, using a knife coater, a comma coater, a reverse coater or the like. In order to obtain a water pressure of 0.6 kg / cm ² or more, the smoothness and air permeability (JIS L-
In general, it is preferable to adjust the coating amount so that the weight of the resin film becomes 5 g / m ² or more, preferably 10 g / m ² or more.

In the present invention, a compound having a high affinity for the resin or the fiber fabric may be used in combination with an isocyanate compound for the purpose of improving the peel resistance between the resin layer and the fiber fabric. . Examples of the isocyanate compound include 2,4-tolylene diisocyanate, diphenylmethane diisocyanate, isophorone diisocyanate, hexamethylene isocyanate, or a compound containing 3 moles of these diisocyanates and active hydrogen (for example, trimethylolpropane, glycerin, etc.) Triisocyanates obtained by addition reaction with moles can be used. The above isocyanates may be in the form in which the isocyanate group is released, or in the form in which the block is dissociated by the addition of phenol, methyl ethyl ketoxime, etc., and then heat-treated. However, it can be used depending on the workability and application.

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

After the resin liquid comprising the above-described polyurethane-based synthetic polymer is applied to the fiber cloth, the present invention provides a resin liquid of 0 to 10%.
The resin is immersed in water at 30 ° C. for 0.5 to 10 minutes for wet coagulation. Thereafter, after washing in warm water at 40 to 60 ° C. for 5 to 15 minutes, drying is performed by a usual method.

In the present invention, the water-repellent treatment may be applied to the coated fabric after the wet coating in order to further improve the waterproofness. For the water repellent treatment, a known water repellent treatment method which is generally performed as described above may be employed.

[0021]

The coating fabric of the present invention has excellent permeability by allowing a resin layer of a synthetic polymer mainly composed of a polyurethane resin to contain substantially non-porous inorganic fine powder having an average particle size of 0.1 μm or less. It is provided with wet performance and waterproof performance. Although it is not clear why the inclusion of the inorganic fine powder having an average particle size of 0.1 μm or less can provide both excellent moisture permeability and waterproof performance, the present inventors speculated as follows. ing.

That is, it is substantially nonporous and has an average particle size of 0.1.
When wet-solidification is performed by coating a cloth with a synthetic polymer solution mainly composed of a polyurethane resin in which an inorganic fine powder having a particle size of less than μm is uniformly dispersed, the polyurethane resin forms its unique porous structure, and at the same time, the inorganic fine powder is contained in the solution. Since the powder is uniformly micro-dispersed, a slight shift in the solidification speed occurs at the interface between the inorganic fine powder and the resin to be solidified, resulting in a significant improvement in the moisture permeability without lowering the waterproof performance. It is presumed that a large number of fine pores of 1 μm or less can be provided.

In the present invention, the moisture permeability is improved by the fine pores formed, so that a problem is likely to occur when pressure is applied during wearing, which is peculiar to the highly moisture-permeable waterproof fabric.
It is also very effective against water leakage. Further, since the inorganic fine powder of the present invention is present uniformly from the surface layer to the lower layer of the resin layer, the surface of the resin layer eliminates the sliminess peculiar to the polyurethane resin, makes it dry-touch, and has the resistance of the entire resin layer. Abrasion and adhesive strength are improved.

[0024]

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to 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) Moisture 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 60 minutes later. (4) Abrasion strength JIS L-1084 (A-1 method) (5) Peel strength A hot melt tape is adhered to the coating surface in the warp direction and measured according to JIS L-1089 method.

Example 1 Nylon high multifilament 7 is used for both the warp and the weft.
Weaving a plain weave with a warp density of 120 yarns / inch and a weft yarn density of 90 yarns / inch using 0 denier 68 filament,
After scouring and dyeing (Mitsubishi Kasei Co., Ltd., acid dye DiacidFast Red 3BL 2% owf) by the usual method,
Padding with 5% aqueous solution of fluorine-based water repellent Emulsion, Asahi Guard 710 (manufactured by Asahi Glass Co., Ltd.)
%) And dried, and then heat-treated at 160 ° C. for 1 minute.
Next, using a calendering machine having a mirror-finished roll, calendering was performed under the 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 the composition shown in the following prescription 1 and having a solid concentration of 25% was applied to the calender surface of the base fabric using a knife over roll coater in an amount of 8%.
Immediately after coating at 0 g / m ² , the resin was solidified by immersing it in water at 15 ° C. for 1 minute, followed by washing in warm water at 50 ° C. for 10 minutes, drying, and drying the inorganic fine powder. 11%
A containing resin layer was formed.

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

Next, in order to make the coated surface water-repellent with a gravure coater, the coated surface is gravure coated with a 5% aqueous solution of Asahi Guard 710, dried, and heat-treated at 160 ° C. for 1 minute to obtain the coated fabric of the present invention. Was.

For comparison with the present invention, a comparative coated fabric (referred to as Comparative Example 1) was obtained in exactly the same manner as in this example except that Aerosil # 130 was omitted from Formulation 1 in this example. . For comparison with the present invention, Nipsil VN3 (manufactured by Nippon Silica Industry Co., Ltd., wet-process microporous SiO ₂ powder having an average particle diameter of 16 nm) was used in place of Aerosil # 130 in Formulation 1 of the present example in the same amount. Except for use, a coating cloth for comparison (referred to as Comparative Example 2) was obtained in exactly the same manner as in this example.

The performances of the coated 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 evident from the results shown in Table 1, the coated fabric of the present invention has excellent water pressure resistance and moisture permeability, and is effective against the water leakage defect of the conventional high moisture permeable waterproof fabric. It is clear that the abrasion resistance and the peeling resistance are good.

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

Formulation 2 75 parts of Rezamin CU-4550 (ester type polyurethane resin manufactured by Dainichi Seika Kogyo Co., Ltd.) 25 parts of PAU-3 (polyamino acid urethane resin manufactured by Mitsubishi Kasei Corporation) 1 part of Rezamin X (Dainichi Seika N.N-dimethylformamide 25 parts Magnesia 100B 5 parts (Ube Chemical Industry Co., Ltd., MgO fine powder having an average particle diameter of 10 to 20 nm)

For comparison with the present invention, a comparative coated fabric (Comparative Example 3) was obtained in exactly the same manner as in this example except that magnesia 100B was omitted from Formulation 2 in this example.

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

[0037]

[Table 2]

As is clear from the results shown in Table 2, the coated 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 can be seen that the abrasion resistance and the peeling resistance are also good.

[0039]

According to the method of the present invention, a coated fabric having excellent moisture permeability and waterproofness can be obtained. Furthermore, the coating fabric of the present invention is excellent in the wear resistance and peeling resistance of the coating resin layer. According to the present invention, since high performance can be obtained in both moisture permeability and waterproofness only by wet coating, it can be manufactured at low cost, which is industrially very advantageous. The coating fabric of the present invention is a material suitable for clothing such as raincoats and outer garments because of its excellent performance.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) D06M 13/00-15/72 D06M 11/00-11/84

Claims (2)

(57) [Claims] An inorganic fine powder having a porous resin layer made of a synthetic polymer mainly composed of a polyurethane resin on a fiber cloth, and having substantially no pores and an average particle size of 0.1 μm or less in the resin layer. 1
%, And has a moisture permeability of 6000 g / m ² · 24 hrs or more and a water pressure of 0.6 kg / cm ² or more, and is excellent in moisture permeability and waterproofness. 2. The fiber fabric is substantially non-porous and has an average particle size of 0.
A polyurethane resin-based synthetic polymer solution containing 1% or more of inorganic fine powder of 1 μm or less with respect to the resin solid content is applied,
A method for producing a coated fabric having excellent moisture permeability and waterproofness, characterized by immersing the resin in water for wet coagulation.