JP2001214374A - Water repellent and moisture permeable fabric and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fabric having durable water repellency and moisture- permeability with maintaining appearance and hand feeling inherent to the fiber. SOLUTION: The aforesaid subject is dissolved with a fabric obtained by heating, melting and attaching by pressure a thermoplastic polyurethane resin having water repellency and moisture permeability on one side of a fabric and impregnating the resin to the one side of the fabric.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a water-repellent and moisture-permeable material obtained by bonding a thermoplastic polyurethane film to one side of a fabric made of natural fibers or synthetic fibers and hot-melt-compressing the resin to impregnate the resin on only one side of the fabric. The present invention relates to a fabric and a method for producing the same.

[0002]

2. Description of the Related Art Heretofore, several methods have been proposed for imparting water repellency and moisture permeability to synthetic fibers such as polyester fibers, nylon fibers, and polypropylene fibers.
Among these, the method called wet coating method,
Based on a thermoplastic polyurethane resin, dimethylformamide, a surfactant, a water repellent, etc. are mixed with this and applied to the fiber.Then, dimethylformamide is eluted in water to form a water-repellent, moisture-permeable film. is there. Also,
A method called a dry coating method is a method in which an organic solvent solution of a polyurethane resin is applied to fibers, and the solvent is evaporated to form a nonporous polyurethane water-repellent film. Further, the laminating method is a method in which a polyurethane film or a tetrafluoroethylene resin film is adhered to a cloth with an adhesive to impart water repellency. In the wet and dry coating methods, a film formed by a single coating does not provide sufficient water repellency and moisture permeability,
Two or several coatings are required. However, when the number of coatings increases, the operation itself becomes complicated, and the thickness of the formed film varies, resulting in uneven water repellency and moisture permeability. In addition, since the laminating method requires an adhesive, there is a problem that the adhesive significantly lowers the moisture permeability of the film and impairs the original texture of the fiber.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fabric having a uniform water repellency and moisture permeability without impairing the original texture of the fiber.

[0004]

The present inventors have conducted various studies to solve the above-mentioned problems. As a result, after processing a water-repellent and moisture-permeable thermoplastic polyurethane resin into a film, one side of a natural or synthetic fiber is processed. And heat to a temperature at which the film begins to soften or melt. Then, by pressing with a pressure device, impregnating the resin only on one side of the fiber,
On the other side that is not impregnated with resin, the original texture of the fiber is kept as it is, and the surface combined with the resin film has water repellency,
The inventors have found that a moisture-permeable film can be formed, and that they have excellent durability, and have further studied and completed the present invention. That is, the present invention provides (1)
A water-repellent, moisture-permeable fabric in which a thermoplastic polyurethane resin having water repellency and moisture permeability is placed on one side of the fabric, and is heated and melt-pressed to impregnate the resin on one side of the fabric; (2) a thermoplastic polyurethane resin Is a film having a thickness of 5 to 100 μm, and the water-repellent, moisture-permeable cloth according to the above (1);
The water-repellent, moisture-permeable cloth according to the above (1), which is performed by pressure bonding with Pa, and (4) a thermoplastic polyurethane resin,
The above (1), which is obtained by reacting an organic diisocyanate, a chain extender and at least one kind of high molecular diol selected from polyethylene ether glycol, polytetramethylene ether glycol and polyoxypropylene polyoxyethylene copolymer. Described water repellency,
A moisture-permeable cloth, and (5) a thermoplastic polyurethane resin having water repellency and moisture permeability placed on one side of the cloth, and
A method for producing a water-repellent and moisture-permeable cloth, in which one side of the cloth is impregnated with a resin by heating to 200 ° C. and pressure bonding at 0.05 to 5 MPa;
It is.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As a fabric used in the present invention,
For example, nylon fiber woven fabric, polyester fiber woven
Object, polyurethane fiber woven fabric, polypropylene fiber woven fabric,
Synthetic fiber woven such as vinylon fiber woven and rayon fiber woven
Objects, wool fabric, cashmere fabric, silk fabric, hemp fabric, cotton fabric
Natural fiber fabrics such as aramid fiber called heat-resistant fiber
Woven fabric, carbon fiber woven fabric, etc.
Weaving blends with textiles are also available. Natural fiber among these
Fibers, especially animal hair fibers such as wool, can be suitably used. Ma
It can also be applied to various nonwoven fabrics and knitted fabrics. these
What is the basis weight, yarn type, weaving, etc.
May be something. Thermoplastic polyurethane used in the present invention
Tongue resin is used for the cup method (JI
SL 1099) is usually 2,000 to 7,
000g ²24 hours, preferably 3,000 to 7.0
00g / m²・ 24 hr, more preferably 4,000 to
7,000 g / m²・ 24 hours. Thermoplastic
Polyurethane resins include organic diisocyanates, chains
Elongating agent and polymer with molecular weight of 1,000 to 5,000
Those obtained by reacting riol can be used advantageously.
You. The type of organic diisocyanate is not particularly limited.
These can be used, but the number average molecular weight is 500 or less.
Aliphatic diisocyanate, aliphatic diisocyanate and fat
One or more of the cyclic diisocyanates are preferred.
It is used well. Examples of such organic diisocyanates
As 4,4'-diphenylmethane diisocyanate
G, p-phenylene diisocyanate, xylylene diisocyanate
Socyanate, methylene diisocyanate, ethylene di
Isocyanate, 1-methylethylene diisocyanate
G, tetramethylene diisocyanate, pentamethylene
Diisocyanate, 2-methylbutane-1,4-diiso
Cyanate, hexamethylene diisocyanate, octa
Methylene diisocyanate, 2,5-dimethylhexane
-1,6-diisocyanate, p, p'-cyclohexyl
Methane diisocyanate, 4,4'-dicyclohexyl
Methane diisocyanate. Among them
4,4'-diphenylmethane diisocyanate, 4,4
'-Dicyclohexylmethane diisocyanate and
Xamethylene diisocyanate is preferably used.

As the chain extender, any chain extender conventionally used for producing polyurethane can be used. Among them, a low molecular weight compound having two or more active hydrogen atoms capable of reacting with an isocyanate group and having a number average molecular weight of 300 or less is preferably used. Examples of such chain extenders include ethylene glycol, propylene glycol, 1,4-butanediol, 1,6-hexanediol, 1,4-bis (β-hydroxyethoxy) benzene, 1,4-cyclohexanediol Diols such as, bis- (β-hydroxyethyl) terephthalate and xylylene glycol; hydrazine, ethylenediamine,
Diamines such as propylenediamine, xylylenediamine, isophoronediamine, piperazine and derivatives thereof, phenylenediamine, tolylenediamine, xylylenediamine, dihydrazine adipate and dihydrazine isophthalate; alcohols such as aminoethyl alcohol and aminopropyl alcohol And one or more of these can be used. Among them, aliphatic diols having 2 to 10 carbon atoms, particularly 4,4-butanediol, are preferably used from the viewpoint of good mechanical properties of the thermoplastic polyurethane. Particularly preferred as the thermoplastic polyurethane resin are 4,4'-methylenebisphenylisocyanate as an isocyanate component, 1,4-butanediol as a chain extender, and a polyol component having a molecular weight of 1,000 to 5,
2,000 poly (tetramethylene ether) glycol and a polyoxypropylene polyoxyethylene copolymer having a molecular weight of 1,000 to 3,000 are used as raw materials, and among these, the active hydrogen component and the molar ratio of the hydrogen component are polyoxypropylene. It is a thermoplastic polyurethane resin obtained by reacting a raw material of polyoxyethylene copolymer / {poly (tetramethylene ether) glycol + 1,4-butanediol} = 1/2 to 1 / 4.2.

Among the polyoxypropylene polyoxyethylene copolymers, random copolymers having less water swellability than block copolymers are preferred. In the reaction, the molar ratio of isocyanate component / active hydrogen component was 1 / 0.95 to
It is preferable to carry out within the range of 1 / 1.03. As the reaction itself, any of known methods such as a prepolymer method and a one-shot method can be applied, but the prepolymer method is preferable. At the time of the reaction, known urethanization catalysts, stabilizers, compatibilizers, coloring agents, and the like can be appropriately added. Thermoplastic polyurethane resin used in the present invention,
The film can be formed by a film processing method known per se such as an inflation method or a T-die method, but the T-die method is preferred in the present invention where thickness accuracy is required. The thickness of the film depends on the type of the fabric and the type of the resin, but is usually 5 to 100 μm, preferably 10 to 70 μm.
m, more preferably 15 to 50 μm. If it is too thin, sufficient water repellency may not be obtained, while
If it is too thick, the moisture permeability may decrease.

In the present invention, one of the preferable methods of impregnating the thermoplastic polyurethane film on only one side of the fabric is to first fit the film on one side of the fabric and to start the temperature at which the film starts to soften or melt, ie, 100 to 200.
C., preferably at 150 to 190 ° C., for 1 to 30 minutes, preferably 5 to 20 minutes.
5 to 5 MPa, preferably 1 to 30 at 0.1 to 3 MPa
Min, preferably 5 to 20 min. With a press machine. In another preferred method, a thermoplastic polyurethane resin film produced by a T-die method or an inflation method is heated in a heating furnace at a melting temperature of 100 ° C.
This is a method in which the resin is heated to about 200 ° C., placed on one side of the fabric, and pressed with upper and lower rolls to impregnate the resin. As another method, there is a method in which a thermoplastic polyurethane resin melted from a nozzle of a heat-melt extruder is applied or sprayed on a cloth, and is pressed with upper and lower rolls to impregnate the resin. The fabric obtained by impregnating the water-repellent and moisture-permeable thermoplastic polyurethane resin on only one side of the fabric thus obtained has high water repellency and moisture permeability on the surface where the film is combined, and has excellent durability and washing resistance. It also has On the other side, the fabric retains its original texture and appearance, so taking advantage of these features, for example, in the field of clothing such as coats, jackets, slacks, skirts, hats, gloves, shoes, bags, chairs, etc. It can be widely used for furniture, such as sofas and beds, and also for interiors such as wallpaper.

[0009]

The present invention will be described more specifically with reference to the following examples. Production Example 1 (Production of Film) Molecular weight of 3,000 heated to 70 to 80 ° C. in a reaction vessel
176 g of poly (tetramethylene ether) glycol
And heated to 50 ° C. to 789.6 g of a polyoxypropylene polyoxyethylene copolymer having a molecular weight of 2,200 (a random copolymer having a polyoxyethylene terminal and a total oxyethylene copolymer content of 90% by weight). 4,
423 g of 4'-methylenebisphenylisocyanate was added with stirring and reacted for 2 minutes, and 111.4 g of 1,4-butanediol heated to 50 ° C was further added and reacted for 2 minutes. Transfer the reaction to a tray and add 140
After aging at 4 ° C. for 4 hours, the resulting lump was pulverized and pelletized by a conventional method to obtain a thermoplastic polyurethane resin pellet. The obtained thermoplastic polyurethane resin had the following physical properties. Hardness: 82 ± 2 (JIS A) (based on JIS K7311) Specific gravity: 1.16 (based on JIS K7311) Elongation: 760% (based on JIS K7311) Tensile strength: 23 MPa (based on JIS K7311) Tear strength: 77 kN / m (based on JIS K7311) The pellets were melt-extruded at 195 ° C. from a T-die extruder to produce a film having a thickness of 30 μm.

Example 1 A water-repellent and moisture-permeable cloth was produced using the film obtained in Production Example 1 and the following five kinds of cloths. Fabric used (1) 100% cashmere fabric, basis weight 330 g / m
² (manufactured by Hosokawa Kaori Corp.) (2) 100% wool fabric, basis weight 320 g / m ² (manufactured by Hosokawa Kaori Corp.) (3) 90% wool, 10% polyester fiber fabric, basis weight 320 g / m ² (Manufactured by Hosokawa Kaori Corp.) (4) 100% polyester resin, basis weight 240 / m ²
(Made by Kojima Interior Co., Ltd.) (5) 50% polyester resin, 50% cotton fabric, basis weight 280 / m ² (made by Kojima Interior Co., Ltd.)

Melt pressure bonding of film Heating and pressing machine (A-YSR-5, Shinto Kinzoku Kogyo Co., Ltd.)
The thermoplastic polyurethane film cut into 90 cm × 90 cm is laid on a heating plate of the above-mentioned method, and fabrics (1) to (3) having the same size as the film are laid thereon.
Heated at 70 ° C. for 15 minutes. Then press 0.3
One side of the fabric was impregnated with the resin by applying a pressure of 10 MPa for 10 minutes. The fabrics of (4) and (5) have a heating of 170
At 10 ° C. for 10 minutes and at a pressure of 0.3 MPa for 5 minutes,
Resin was impregnated on one side with the same method as in the case of the woven fabrics (1) to (3). In each of the fabrics (1) to (5) subjected to the above treatment, only one side in contact with the film is impregnated with the resin to have water repellency, and the other side not in contact with the film has an original surface of the fabric. It had an appearance and texture.

Test 1 The resin-impregnated fabrics (1) to (5) obtained in Example 1 were subjected to a delamination test and a moisture permeability test. Delamination test: compliant with JIS K6301 Moisture permeability test: compliant with JIS L1099 The results are shown in [Table 1].

[Table 1] As is apparent from Table 1, the adhesion between the woven fabric and the film is extremely strong. Particularly, in the case of natural fibers, the peel strength is high enough to cause material destruction, and the moisture permeability of the resin-impregnated cloth is 5 or less. , 000~60,000g ^/ m 2 · 24h
r or higher, indicating good moisture permeability.

[0013]

The water-repellent and moisture-permeable fabric melt-impregnated with the thermoplastic polyurethane resin according to the method of the present invention forms a durable water-repellent and moisture-permeable film on one side, and the other side has fibers originally. It retains texture and appearance. It can also be applied to animal hair fibers, which have been conventionally difficult to process, and does not impair the texture or appearance of the fibers.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) B29K 105: 08 B29K 105: 08 B29L 9:00 B29L 9:00 F term (reference) 4F100 AJ08 AK41 AK51B BA02 DG11A DG12 EC032 EH012 EJ172 EJ422 EJ822 GB72 JB20 JB20B JD04 JD04B JL00 4F211 AA42 AD01 AD08 TA01 TC05 TC21 TJ09 TN86 TQ03 4L033 AB04 AC03 AC07 CA50 CA69

Claims (5)

[Claims] 1. A water-repellent and moisture-permeable cloth comprising a thermoplastic polyurethane resin having water repellency and moisture permeability placed on one side of the cloth, and heated and melt-pressed to impregnate the resin on one side of the cloth. 2. A thermoplastic polyurethane resin having a thickness of 5 to 10
The water-repellent, moisture-permeable cloth according to claim 1, which is a 0-μm film. 3. The water-repellent and moisture-permeable cloth according to claim 1, wherein the heat-melt pressure bonding is performed by heating at 100 to 200 ° C. and then pressing at 0.05 to 5 MPa. 4. A thermoplastic polyurethane resin reacts with an organic diisocyanate, a chain extender and at least one polymer diol selected from polyethylene ether glycol, polytetramethylene ether glycol and polyoxypropylene polyoxyethylene copolymer. The water-repellent, moisture-permeable cloth according to claim 1, which is obtained by allowing the cloth to be obtained. 5. A thermoplastic polyurethane resin having water repellency and moisture permeability is placed on one side of a cloth, heated to 100 to 200 ° C., and pressed at 0.05 to 5 MPa to impregnate the resin on one side of the cloth. A method for producing a water-repellent, moisture-permeable fabric.