JPH0465580A - Flexible coated cloth - Google Patents

Abstract

PURPOSE:To obtain the title cloth having excellent flexibility, by applying an undercoat layer containing a polymer of an organosilicon compound in a lattice state to one side of cloth and then coating the undercoated layer with a resin coating layer of polyurethane elastomer. CONSTITUTION:One side of woven or knit fabric comprising natural or synthetic yarn is coated with a resin containing 20-100wt.% polydimethylsiloxane shown by formula I to formula III (m and n are 100-100,000; x is 1-100) or a siloxane of modified type with an alpha-olefin or methylstyrene in an undercoat layer in a lattice state, preferably in such a way that the coated side of the fabric has 1-20mm<2> area of dotted part in space part of the latticed undercoat layer, the coated side is dried, further coated with a coating layer of polyurethane elastomer, dried and heat-set to give extremely flexible coated cloth free from feeling of hardness.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a coated fabric having a soft feel.

[Conventional technology]

Traditionally, fabric coatings have been made to be waterproof, water repellent,
In order to impart functions such as moisture permeability and windproofness, as well as surface changes such as color, gloss, and texture, a wide range of coating materials are used. Polyacrylic acid ester, polyurethane, silicone resin, etc. are used as resins for this coating process. There is.

These resins are used because, among coated fabrics, those used for clothing tend to have a soft feel, and a soft resin with a low glass transition point is required.

However, even with fabrics using such resins, when the direct coating method is applied, the adhesion to the fabric is good, but the resin seeps into the fabric too much, and the resin causes damage to the fibers. There was a drawback that the gaps were glued together and the texture of the fabric became stiff.

Therefore, various methods have been tried in the past in order to obtain soft coated fabrics.

One method is to reduce adhesion of resin between fibers. This method includes the transfer lamination method, which is softer than the direct coating method, but it is difficult to make the film layer thinner than the direct coating method, so the film layer is thick and still lacks softness.

Another method has been devised to replace the transfer lamination method with dot adhesion, but although this method makes the material a little softer, it is still insufficient, and furthermore, the peel strength is poor due to dot adhesion. There are drawbacks. Furthermore, the transfer lamination method has the problem of being expensive.

[Problem to be solved by the invention]

The present invention was made against the background of the problems of the prior art, and provides a novel coated fabric that has functions comparable to those of conventional coated fabrics, is flexible, and is rich in fashionability and functionality. Furthermore, it is an object of the present invention to provide a coated fabric that is more cost-effective than that produced by transfer lamination.

[Means to solve the problem]

The present invention provides a flexible coated fabric in which at least one side of the fabric is coated with an undercoat layer containing a polymer of an organosilicon compound in a substantially lattice pattern, and then coated with a resin coating layer mainly composed of polyurethane elastomer. This is what we provide.

Fabrics in the present invention include woven fabrics, knitted fabrics, non-woven fabrics, etc., and their constituent fibers include natural fibers such as cotton, hemp, wool, and silk, synthetic fibers such as nylon, polyester, and acrylic, and mixtures thereof. It may consist of, etc. That is, any of the materials commonly used as coating base fabrics can be used, but among them, woven and knitted fabrics are particularly desirable. From the viewpoint of the texture of the resulting coated fabric, it is preferable to use fibers constituting the fabric with a single yarn fineness of 2 deniers or less.

Examples of the organosilicon compound polymer for the undercoat of the present invention include polyorganosiloxane (silicone),
Polyorganosilanes, polyorganosilazanes, etc. may be used in combination, and among these, polydimethylsiloxanes represented by the following structural formulas 〇 to ■, or modification of the polydimethylsiloxanes with α-olefins or methylstyrene are included. Body is preferred.

■Polydimethylsiloxane ■α-olefin modified type ■Methylstyrene modified type C.J.

(In the general formulas ■ to ■, m is 100 to 100.0
In the present invention, the polymer of these organosilicon compounds is contained in the undercoat layer in an amount of 20 to 100% by weight. If the content of the organosilicon compound polymer is preferably less than 20% by weight, the texture will be similar to that of a directly coated fabric, and the desired soft texture will not be obtained.

The coated fabric of the present invention has, on at least one side thereof,
An undercoat layer containing a polymer of this organosilicon compound is coated in a substantially lattice pattern.

Here, the lattice shape refers to the so-called lattice shape [FIG. 1(a)] as shown in FIG. 1, as well as the polka dot shape [FIG. 1(b)].
), mesh [Figure 1 (C) L diagonal lattice shape (Figure 1 (uniform)
, the dot-like parts, which are the spaces in the lattice, are almost triangular [Fig. 1 (
e)].

In FIG. 1, reference numeral 10 indicates a lattice, and reference numeral 20 indicates a dot-like portion which is a space of the lattice.

Note that the dotted portions, which are the spaces of the lattice-shaped undercoat layer of the present invention, have an area of 1 to 20 m'', and the total area of the dotted portions is 30 to 70% of the surface area of the fabric.
It is preferable that

If the area of the dotted portions is less than 1×2, the desired substantially lattice-like pattern cannot be obtained during coating, while if it exceeds 20×2, there will be more adhesion between fibers and the texture will be hard. Furthermore, if the total area of the dotted portions is less than 30% of the surface area of the fabric, the adhesion between the urethane coat layer and the fabric will be poor;
If it exceeds this value, the adhesive strength will improve, but the texture will become hard and it will not be possible to obtain a coated fabric with the desired texture.

Furthermore, such a lattice-like shape has repeating units,
The unit size is preferably 1 to 20 mm; if it is less than 1 mm, it is difficult to create a pattern that requires an undercoat, while if it exceeds 20 m++, local variations in texture will become large.

The amount of the undercoat layer applied in the dry state is 1 to 1.
0 g/nf is preferred. The amount of undercoat layer applied is 1
If it is less than 10 g/nf, it will be difficult to control the coating amount, while if it exceeds 10 g/nf, the film forming properties with a resin mainly composed of polyurethane elastomer will be poor.

The area to which the undercoat layer is applied is preferably 70 to 30% of the surface area of the fabric; if it exceeds 70%, the adhesion between the polyurethane elastomer and the fabric will be poor, while if it is less than 30%, the texture will be poor. It becomes hard.

The method for forming such an undercoat layer is not particularly limited, but the undercoat layer is dispersed in an appropriate solvent and applied in a lattice shape using a gravure coater, a screen coater, or the like. For example, a predetermined grid pattern is created and coated on an 800-mesh rotary screen.

In addition, the processing conditions after applying the undercoat layer were 8
It is about 1 to 3 minutes at 0°C to 130'C.

The coated fabric of the present invention is formed by further coating the undercoat layer with a resin film layer mainly composed of polyurethane elastomer.

This polyurethane elastomer is a polymer composed of a polyol, an organic diisocyanate, and a chain extender, which is made into a polymer mainly through urethane bonds.

The polyol is mainly a compound having a molecular weight of 500 to 3,000 and having hydroxyl groups at both ends. Polyols are of polyether type and polyester type, and polyether types include polyoxyalkylene glycols such as polyethylene glycol ether, polypropylene glycol ether, and polytetramethylene glycol ether, and even copolymers of these good. Polyester types include low molecular weight glycols such as evaporated ethylene glycol, propylene glycol, 1.
Polylactone type, which is a polycondensation reaction of a diol such as 4-butylene glycol or 6-hexane glycol with a dicarboxylic acid, such as adipic acid, sepacic acid, or isophthalic acid, or a ring-opening polymer such as polyε-caprolactone. There is.

On the other hand, as an organic diisocyanate, 2
isocyanate groups, for example 2.4-
) lylene diisocyanate, 4°4'-diphenylmethane diisocyanate, l.

Examples include 6-hexamethylene diisocyanate and isophorone diisocyanate.

Furthermore, the last component, the chain extender, is a compound having two active hydrogens, and is mainly a low-molecular compound. Examples include glycols such as ethylene glycol and butylene glycol, diamines such as hydrazine, ethylene diamine, 1,2-propylene diamine, and m-1-lylene diamine, and amino alcohols.

In the present invention, when the coated fabric requires moisture permeability, the polyurethane elastomer has a polyoxyalkylene glycol weight fraction of 5% in its polyol component.
It is preferably in the range of ~50%. The weight fraction is 5
If it is less than 50%, moisture permeability will decrease, while if it exceeds 50%, adhesion will be poor.

The resin coating mainly consists of polyurethane elastomer,
In this case, in order to improve the adhesion between the first layer and the second layer, it is preferable to use a crosslinking agent such as an isocyanate compound or a melamine compound. Effective.

The resin coating mainly composed of polyurethane elastomer may be composed mainly of the polyurethane elastomer and may contain a small amount of other polymer, for example, 5 to 30% by weight. Various other polymers may be used depending on the purpose, but it is essential that the polymer be dissolved in the solvent in which the polyurethane-based polymer is dissolved. Furthermore,
Inorganic or organic colorants, fillers, various stabilizers, and other additives may be mixed.

The amount of the resin coating mainly composed of polyurethane elastomer is preferably 1 to 20 g/bo in a dry state, and I
g/nf, it is difficult to form a complete film;
If it exceeds -0 g/a, the film becomes thick and the texture is unfavorable. In addition, when the film of the coating fabric is a film having moisture permeability, the film thickness of the resin film mainly composed of polyurethane elastomer is preferably 5 to 30 μm; if it is less than 5 μm, the mechanical properties of the film may be insufficient. On the other hand, if it exceeds 30 μm, the moisture permeability will decrease significantly.

The method for forming a resin film mainly composed of polyurethane elastomer is not particularly limited, but it can be carried out using a knife coater, comma coater, gravure coater, etc. in a state where the polyurethane elastomer is dispersed in a suitable solvent, and the resin film has microporous on the surface of the film. Porous or non-porous materials may be formed.

For example, there are various ways to use a porous material with micropores, but a typical method is to mix an emulsion resin, a volatile solvent, and water to uniformly emulsify it, and then coat the fabric with the resin solution. A microporous film is obtained by first evaporating the volatile solvent at a temperature that allows only the volatile solvent to evaporate and not water, and then evaporating water at a temperature that allows water to evaporate.

Further, the processing conditions after applying the resin layer mainly composed of polyurethane elastomer are 60 to 130°C for about 1 to 5 minutes.

The coated fabric of the present invention has the above-mentioned structure, but the most distinctive feature of the present invention is that, although it is a direct coating method, it is possible to obtain a coated fabric with excellent flexibility that has not been possible before. This is possible.

[Effect]

In the coated fabric of the present invention, the undercoat layer mainly contributes to improving the feel, while the polyurethane elastomer layer mainly contributes to imparting functionality.

When such specific compounds are combined, it is easy to obtain coated fabrics that have a soft texture that is difficult to achieve not only by conventional direct coating methods but also by transfer lamination methods, and which are also endowed with functions. .

〔Example〕

Hereinafter, the present invention will be explained in more detail with reference to Examples.

In addition, parts and % regarding concentration in Examples represent parts by weight and % by weight, respectively.

In addition, the physical properties of the coated fabrics shown in the Examples were evaluated by the following method.

■ Texture value Measured value based on the texture evaluation system (KES-FB system) established by the Japan Textile Machinery Society's Total Weight and Comparison Research Committee (Women's Thin Fabric Standard) ■ A sensory test using texture handling was conducted, and the following A three-level evaluation was conducted.

○; Very good △；Normal ×；Poor ■Bending resistance Based on the bending test (KES-FB method described above).

The larger the value, the harder it tends to be.

(2) Water pressure resistance Measured according to the method specified in JIS L-1079 (low water pressure method).

(2) Moisture permeability Measured according to the method specified in JIS K-6549.

(2) Peel strength Measured according to the method specified in JIS K-6328.

■Water repellency method specified in JIS L-1092 (spray method)
Measured according to

■Rubbing resistance Using a Gakushin type friction fastness tester, the polyurethane surfaces were stacked and rubbed together 100 times under a load of 500 g. Grade 5 if the polyurethane surface is completely undamaged; Grade 4 if the polyurethane surface is only partially damaged; Grade 3 if the polyurethane surface is damaged to the extent of 1/3; and Grade 27 if the polyurethane surface is damaged.
A case where the polyurethane surface was completely peeled off was judged as a grade 2, and a case where the polyurethane surface was completely peeled off was graded as a grade 1.

Example 1 A plain woven fabric using polyester false twisted yarn (75 denier/72 filaments) for the warp and weft was fabricated with a warp density of 1.
25 threads/2.54cm, weft density 95 threads/2.54CI
After weaving with +, refining and relaxing using the usual method, dyeing with disperse dye, and thoroughly washing with water, apply two water repellent treatment solutions of the following formulation 1 using a roll mangle padder, squeezing rate 50%, 20 m of cloth. /min, then 1 min.
After drying at 30°C for 1 minute, it was further heat-set at 180°C for 1 minute.

Treatment” - Fluorine-based water repellent side (manufactured by Meisei Chemical ■, AC-710) 5.0
% Melamine-based texture adjustment durability improver (manufactured by Sumitomo Chemical ■, Sumitex Resin M-3) 0.5% Catalyst for M-3 (
Sumitomo Chemical ■, Sumitex Accelerator-ACX)
0.01% Next, using a calendar processing machine, the temperature was 180°C, the pressure was 40 kg/cm, and the speed was 2.
A raw cloth was prepared by calendering at a speed of 0 m/min.

Next, the undercoat resin shown in Formulation 2 was applied to the original fabric in a checkered pattern (pattern width 11, interval 2w; area ratio occupied by the pattern 55%).
) Application amount after drying with a screen cylinder: 1g/rr
After coating with f and drying at 130°C for 1 minute, apply a polyurethane elastomer having the composition shown in Formulation 3 using a floating knife coater in an amount of 2 g/r.
rf, dried at a temperature of 130°C for 1 minute, and then coated with a polyurethane elastomer having the composition shown in Formulation 3 using a floating knife coater at an applied amount of 1 g/% at a temperature of 130°C. The fabric was dried for 1 minute and then heat set at 160°C for 1 minute to obtain a fabric of the present invention.

The texture and physical properties of this coated fabric were evaluated. The results are shown in Table 1.

2 An-coat) Dimethyl silicon compound (manufactured by Shin-Etsu Chemical Co., Ltd., KM20
02-T) 100 part 3 bowl 1 ure
polyurethane elastomer) polyurethane elastomer (
Heimlen Y-235, manufactured by Dainichiseika Kogyo ■)
100 parts methyl ethyl ketone
80・Part water
20 parts Isocyanate crosslinking agent (Dainichiseika Kogyo ■
Co., Ltd., X-100) 2 parts Comparative Example 1 The raw fabric of Example 1 was coated with the polyurethane elastomers shown in the above formulation 3 and the following formulation 4 in the same manner as in Example 1, without undergoing any undercoat layer treatment, for comparison. Example 1
fabric was obtained.

The evaluation results for this fabric are shown in Table 1.

4 Polyurethane elastomer) Polyurethane elastomer (manufactured by Dainichiseika Kogyo Co., Ltd., Heimlen Y-22
9), 100 parts methyl ethyl ketone 114 parts water/methyl ethyl ketone (2
0/1-) 86 parts silicone smoothing agent (manufactured by Dainichiseika Kagyo ■, UM-816)
2 parts Comparative Example 2 A polyurethane elastomer shown in the following formulation 5 was coated on polypropylene-coated release paper using a comma coater so that the weight after drying was 10 g/rrf, and after drying at a temperature of 80 ° C for 1 minute. , and dried at 120° C. for 1 minute to form a skin layer.

Next, the resin composition for the urethane adhesive side layer shown in Formulation 6 below was applied to the previously obtained skin layer using a comma coater so that the weight after drying was 1.
Coated to 5g/rrf and heated to 80°C
After drying for t'i minutes, a resin film layer was obtained.

The original fabric and the resin film were pasted together through a heated roll at 120°C and aged for 2 days, and then the release paper was peeled off to obtain a laminated fabric of Comparative Example 2. The obtained laminated fabric was evaluated in the same manner as in Example 1, and the results are shown in Table 1.

5 Urethane polyurethane elastomer (manufactured by Dainippon Ink ■, Crisbon NYT-15) 100 parts isopropyl alcohol 12 parts toluene
Part 12 6 Uren
) Polyurethane elastomer (manufactured by Dainippon Ink ■, Crisbon TA-265) 100 parts Crosslinking agent (manufactured by Dainippon Ink ■, Crisbon DN-950)
10 parts crosslinking accelerator (Dainippon Ink Co., Ltd., Crisbon Accel T)
10 parts N,N-dimethylformamide 10 parts Toluene 30 parts Table 1 The coated fabric of Example 1 had a bending resistance of 0.036 g-
cj/cm, and has superior flexibility compared to the fabrics of Comparative Examples 1 and 2, and is also superior to the fabrics of Comparative Examples 1 and 2 in terms of physical properties.

Example 2 Using the same original fabric as in Example 1, coated with the undercoat resin of formulation 2 using a screen cylinder in the same manner as in Example 1, at the checkered pattern level shown in Table 2, and at a temperature of 130°C. After drying for 1 minute, coatings of formulation 3 and formulation 4 were applied in the same manner as in Example 1, and heat treatment was similarly performed at a temperature of 160°C for 1 minute. The results are shown in Table 3.

As is clear from Tables 2 and 3, in terms of texture, peel strength, and rubbing resistance, the coated fabric of the present invention has a pattern-occupied area ratio of 30 to 70%, and an unapplied dotted area of 1 ~20 points 2 indicates that good results can be obtained.

〔Effect of the invention〕

The present invention can provide a coated fabric that has a feel that is excellent in flexibility and does not have the hard feel of conventional coated fabrics. Therefore, the coated fabric of the present invention can be used for sports clothing, general clothing, string materials,
Useful for interior materials, car seats, tents, etc.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram illustrating the "lattice-like" structure of the undercoat layer. Patent applicant Kitasen Co., Ltd. Agent Patent attorney Takashi Shirai (b) (C) (d) (e)

Claims (1)

[Claims] (1) A flexible coated fabric formed by coating at least one side of the fabric with an undercoat layer containing a polymer of an organosilicon compound in a substantially lattice pattern, and then coating with a resin film layer mainly composed of a polyurethane elastomer.