JPH07145570A - Production of moisture-permeable and waterproof coated fabric - Google Patents

Abstract

PURPOSE:To obtain a moisture-permeable and waterproof coated fabric excellent in the peel resistance of the resultant coating film, by coating polyester textile fabric with a polyester resin-contg. polyurethane resin emulsion. CONSTITUTION:One side of polyester textile fabric is dry-coated, using e.g. a knife coater or reverse coater, with an emulsion prepared by incorporating a polyurethane resin-predominant emulsion solution with an organic solvent (e.g. methyl ethyl ketone, toluene) solution containing 0.5-10wt.% of a polyester resin, followed by drying, thus obtaining the objective flexible, moisture- permeable and waterproof coated fabric excellent in the peel resistance of the resultant pored resin film. The polyester resin is pref. a thermoplastic polyester resin produced by polymerization between a diol such as ethylene glycol and terephthalic or isophthalic acid.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is excellent in moisture permeability and waterproof performance,
The present invention relates to a method for producing a moisture-permeable and waterproof coating fabric having excellent peel resistance of a resin film.

[0002]

2. Description of the Related Art A moisture-permeable waterproof coated cloth having a function of preventing rainwater and releasing body sweat vapor out of clothes is an essential material for sportswear such as ski wear and windbreaker. Recently, in addition to moisture permeability and waterproof performance, the feeling has come to be particularly important, and soft ones are preferred.

Conventionally, there have been known wet coating methods and dry coating methods as methods for producing a moisture-permeable and waterproof coating fabric. A moisture-permeable and waterproof coating fabric having a soft texture and excellent moisture-permeation and waterproof performance has been produced at low cost. As a method for obtaining the same, a dry coating method using an emulsion solution of polyurethane resin or acrylic resin as a coating resin is often used.

However, in general, a resin film using an emulsion solution as a coating resin has a problem that it is inferior in peeling resistance to a resin film using another solvent-based polyurethane resin or the like, This tendency is particularly noticeable when the coating base fabric is a polyester fiber fabric, and the coating resin layer often peels off when worn. In order to obtain sufficient peeling strength of the resin coating layer, a method of using a large amount of an isocyanate compound having a high affinity for both the resin and the fiber cloth may be considered, but as a result, the texture of the coating cloth becomes hard. There is a drawback.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is a flexible moisture-permeable waterproof having an excellent moisture-permeable waterproofing property and a resin film peeling resistance. The purpose of the present invention is to obtain a functional coating fabric.

[0006]

SUMMARY OF THE INVENTION The present invention achieves the above object and has the following configuration. That is, according to the present invention, when a polyurethane resin-based emulsion solution is applied to one surface of a polyester fiber cloth to form a resin layer having pores by a dry coating method, the polyester resin is added in an amount of 0.5 to 10 in the solution. The gist of the present invention is to provide a method for producing a moisture-permeable and water-proof coated fabric, which is characterized by containing it in a weight percentage.

The present invention will be described in detail below.

The polyester fiber cloth used in the present invention means polyester fibers such as polyethylene terephthalate and polybutylene terephthalate, and cationic dye dyeable polyester fibers obtained by copolymerizing sulfoisophthalic acid or its metal salt during ester polymerization. It means a woven fabric, a knitted fabric, or a non-woven fabric mainly, and nylon, cotton, wool, rayon, etc. may be mixed by means such as mixed weaving, mixed knitting, mixed spinning, and mixed fiber. Among these fibers, cationic dye-dyeable polyester fibers having no dye migration are most suitable for the present invention.

In the present invention, the above-mentioned fiber cloth may be treated with a water repellent agent in advance. 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, or a fluorine water repellent, and the treatment thereof is also a commonly used padding method, spray method, or the like. 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 (Asahi Glass Co., Ltd., fluorine-based water repellent emulsion) is padded (squeezed) with a 5% aqueous dispersion. Rate 3
5%), and then heat treatment at 160 ° C. for 1 minute.

In the present invention, an emulsion solution mainly containing a polyurethane resin containing a polyester resin is applied onto the above-mentioned fiber cloth and dried to form a resin film.
A film is formed by a so-called dry coating method.

The polyurethane resin-based emulsion solution used here is a polymer obtained by subjecting a prepolymer, which is a known reaction product of an isocyanate and a polyol, to emulsification and urethanization with an emulsifier, a chain extender, or the like. And an aromatic diisocyanate, an aliphatic diisocyanate, an alicyclic diisocyanate alone or a mixture thereof as an isocyanate component, for example, tolylene 2,4-diisocyanate,
4,4'-diphenylmethane diisocyanate, 1,6-hexane diisocyanate, 1,4-cyclohexane diisocyanate, etc. are used, and as the polyol component,
Polyether polyol and polyester polyol are used. In the case of polyether polyol, polyethylene glycol, polypropylene glycol, polytetramethylene glycol, etc. are used. In the case of polyester polyol, diols such as ethylene glycol and propylene glycol and adipic acid, sebacic acid, etc. are used. A reaction product with a dibasic acid or a ring-opening polymer such as caprolactone is used.

The polyurethane resin-based emulsion solution comprises 60 to 10 times the polyurethane resin emulsion solution.
0%, and other emulsion solutions may contain polyacrylic acid, polyvinyl acetate, polyvinyl chloride, polystyrene and the like, or copolymers or derivatives thereof in a range of less than 40%.

In the present invention, the above polyurethane resin-based emulsion solution is applied to one surface of the polyester fiber cloth. In this application, the emulsion solution contains 0.5 to 10% by weight of the polyester resin and is applied. Is especially important to do.

The polyester resin used here includes ethylene glycol, trimethylene glycol, 1,
4-butanediol, 1,5-pentanediol, 1,6-
Hexanediol, neopentyl glycol, etc., one or more kinds of diols and terephthalic acid, isophthalic acid, naphthalene dicarboxylic acid, adipic acid, sebacic acid, undecane diacid, dodecane diacid, etc., one or more kinds aroma Examples include polymerization reaction products of aromatic dicarboxylic acids and aliphatic dicarboxylic acids. The diol component and dicarboxylic acid component are selected so that the polymer becomes amorphous, and volatile components such as methyl ethyl ketone, ethyl acetate, and toluene are selected. Adjust so that it dissolves easily in an organic solvent. For example, ethylene glycol and neopentyl glycol as the diol component,
Polymerized by using terephthalic acid, isophthalic acid, and sebacic acid as dicarboxylic acid components, the molecular weight is 15,000 to 30,
000 thermoplastic saturated copolyester resins are preferably used in the present invention.

The amount of the above-mentioned polyester resin used is based on the polyurethane resin-based emulsion solution.
0.5 to 20% by weight is used, preferably 1 to 10% by weight
If the amount used is less than 0.5% by weight, the peeling resistance of the resin film is poor, and if it exceeds 20% by weight, the coated fabric tends to have a hard texture. Not preferable.

A knife coater, a reverse coater, a comma coater or the like is appropriately used in the coating of the method of the present invention, and when the texture of the coated fabric is emphasized, the dry resin film weight should be 3 to 15 g / m ^2. ,Also,
When the water pressure resistance is important, the dry resin film weight is 15 to 3
The coating amount may be adjusted to 0 g / m ² for coating, and then the resin film having pores may be formed by drying.

Further, when a multi-layer coating method is adopted for coating, the above polyester-based resin exerts a sufficient effect on the peel strength only by including it in the first layer in contact with the fiber cloth. This method is very effective when the texture of the coated fabric is taken into consideration.

In the present invention, a compound having a high affinity with the resin or the fiber cloth may be used in combination with the resin solution for the purpose of further improving the peeling resistance between the resin layer and the fiber cloth during coating. As a compound, an isocyanate compound may be used in combination.

As the isocyanate compound, 2,4-tolylene diisocyanate, diphenylmethane diisocyanate, isophorone diisocyanate, hexamethylene diisocyanate or a compound containing 3 mol of these diisocyanates and active hydrogen (eg, trimethylolpropane, glycerin, etc.) Triisocyanates obtained by addition reaction with 1 mol can be used. The above isocyanates may be in a form in which the isocyanate group is free, or in a form in which the block is dissociated by the subsequent heat treatment after being stabilized by adding phenol, methylethylketoxime, or the like. However, it can be used, and it may be properly used depending on workability and purpose.

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 used is less than 0.1% by weight, the adhesive strength of the resin layer to the fabric is low, and if it exceeds 10% by weight, the texture tends to harden, which is not preferable.

In the present invention, for the purpose of further improving waterproofness, the coated cloth may be subjected to a water repellent treatment after the dry coating. For the water repellent treatment, the well-known water repellent treatment method that is generally carried out as described above may be adopted.

[0022]

[Operation] Since the polyester resin and the polyester fiber used in the present invention are similar in composition, the solubility parameter values are naturally similar, and the two are excellent in compatibility. When the polyester resin excellent in compatibility with the polyester fiber is contained in the coating resin solution and applied to the polyester fiber cloth, the good compatibility of the coating resin with the fiber cloth acts and the fiber of the coating resin is applied. Adhesion to the fabric is improved, and peeling resistance and abrasion resistance of the resin film are improved.

Since the polyester resin used in the present invention is easily and uniformly dissolved in general-purpose organic solvents such as methyl ethyl ketone, toluene, ethyl acetate, etc., an emulsion solution containing polyurethane resin as the main component is uniformly dissolved. When a dry film is formed, the polyester resin is uniformly dispersed in the resin layer having holes, and the adhesive strength of the resin film and the abrasion resistance of the resin layer are improved.

Moreover, according to the method of the present invention, it is possible to minimize the use of the isocyanate compound which causes the hand-curing, and it is possible to obtain a flexible coated cloth.

[0025]

EXAMPLES The present invention will be described in more detail with reference to the following examples. The performances of the coated fabrics in the examples were measured and evaluated by the following methods. (1) Water pressure resistance JIS L-1092 (low water pressure method) (2) Water vapor permeability JIS L-1099 (A-1 method) (3) Peel strength Adhesion of a hot melt tape to the coated surface in the longitudinal direction, JIS L It measured according to -1089. (4) Wear strength JIS L-1084 (method A-1) (5) Feeling The following three-stage evaluation was performed by handling. ○: Soft △: Slightly hard ×: Hard

Example 1 Warp density 12 using 75 denier / 96 filaments of cationic dyeable polyester filaments for both warp and weft threads
Weaving a plain weave of 0 yarns / inch and weft density of 95 yarns / inch, and scouring and dyeing by the usual method (Nippon Kayaku Co., Ltd., basic dye Kayacryl Blue GSL-ED 1.5%)
owf), followed by padding with an Asahi Guard 710 (Asahi Glass Co., Ltd.) 5% aqueous dispersion of a fluorine-based water repellent emulsion (squeezing rate 40%), drying, and then heat treatment at 160 ° C. for 1 minute. It was Next, using a calendering machine having a mirror surface roll, calendering was performed under the conditions of a temperature of 180 ° C., a pressure of 30 kg / cm ² and a speed of 40 m / min to obtain a base fabric for coating.

Here, a polyurethane resin emulsion solution having a solid content of 17% shown in the following Formulation 1 was applied to the calender surface of the above base cloth using a comma coater in an amount of 120 g / m ²
(Dry resin film weight 20g / m ² ) After coating, 80 ℃
And dried for 5 minutes to obtain the moisture-permeable and waterproof coating fabric of the present invention.

Formulation 1 Heimlen X-3038 100 parts (Dainichi Seika Kogyo KK, polyurethane resin) Resamine X 1 part (Dainichi Seika KK, isocyanate compound) Methyl ethyl ketone 20 parts Toluene 20 parts Water 50 parts UE- 3500 2 parts (Unitika Ltd., saturated copolyester resin)

Formulation 1 of this Example for comparison with the present invention
A moisture permeable and waterproof coating fabric for comparison (Comparative Example 1) was obtained by the same method as in this Example except that UE-3500 was omitted.

Furthermore, for the purpose of comparison with the present invention, UE-3500 was omitted from the formulation 1 of this example, and the Resamine X1 was omitted.
A moisture permeable and waterproof coating fabric for comparison (Comparative Example 2) was obtained in the same manner as in this example except that the amount of the composition was increased to 3 parts.

The performances of the present invention and the comparative coated fabric were measured and evaluated, and the results are shown together in Table 1.

[Table 1]

As is clear from Table 1, the moisture-permeable and waterproof coating fabric produced by the method of the present invention has excellent peel strength and abrasion strength, and is also excellent in water pressure resistance, moisture permeability and feeling. I understand.

[0033]

EFFECTS OF THE INVENTION According to the method of the present invention, it is possible to produce a moisture-permeable waterproof coating fabric having excellent water pressure resistance and water vapor transmission rate, softness of the resin film, and excellent abrasion resistance. You can The excellent performance of the coated fabric of the present invention makes it a material suitable for sports clothing, outer garments and the like.

Claims (1)

[Claims] 1. When a polyurethane resin-based emulsion solution is applied to one side of a polyester fiber cloth to form a resin layer having pores by a dry coating method, the polyester resin is added to the solution in an amount of 0.5 to 10 A method for producing a moisture-permeable and waterproof coated fabric, which is characterized in that it is contained in a weight percentage.