JPH04202853A - Production of coated cloth - Google Patents

Abstract

PURPOSE:To obtain the title cloth having excellent water repellency and adhesiveness of coating film by subjecting cloth to water-repellent treatment, removing a water repellent existing on the surface later part of the cloth and coating the cloth. CONSTITUTION:Cloth such as sheetlike woven fabric or knitted fabric comprising yarn such as polyester, wool, cotton or acetate is subjected to water-repellent treatment (preferably fluorine-based water repellent), the water repellent existing on one side or both sides of the surface layer part is removed preferably by sand blasting processing and the cloth is coated to give the objective cloth.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for producing a coated fabric with excellent water repellency and coating adhesion.

Conventionally, coated fabrics, for example single-sided coated fabrics for clothing, have been coated after being treated with a fluorine-based or silicone-based water repellent to make them water repellent in order to prevent the coating resin from bleed through. It is common to process it. In addition, for industrial double-coated fabrics such as tent fabrics and tarpaulins, the fabric is water-repellent with a fluorine-based or silicone-based water repellent to prevent water from penetrating from the cut end surface into the base fabric due to capillary action. It is common to apply a coating after the treatment.

However, pretreatment with these water repellents is not preferable from the viewpoint of adhesion of the coating film, and generally, as the degree of water repellency improves, the adhesion between the base fabric and the coating film decreases. Therefore, for example, if pre-treatment is performed to impart strong water repellency to the non-coated side of a single-sided coated fabric for sports clothing, the adhesion between the base fabric and the coating film will further decrease. However, at present, it is not possible to obtain coated fabrics that can withstand practical use.

In order to solve this problem, we first coated the fabric with a relatively weak water-repellent pretreatment that satisfies adhesion, and then applied a highly water-repellent finish to the non-coated surface. However, further application of a water repellent to the pretreated water repellent surface results in extremely poor workability, and in the end, a coated fabric that satisfies both high water repellency and high adhesion has not been obtained.

Further, Japanese Patent Application Laid-Open No. 59-106570 proposes a method of improving adhesion by subjecting a fabric to water-repellent treatment and then exposing only one side of the fabric to low-temperature plasma.

However, this method requires special vacuum equipment and electric discharge equipment, requires a large amount of equipment investment, and a significant increase in processing costs is unavoidable; Until now, there were problems with plasma and poor processing stability.

[Problems to be Solved by the Invention] An object of the present invention is to provide a method for producing a coated fabric that satisfies both high water repellency and high adhesiveness.

[Means for Solving the Problem] The present invention has the following configuration to achieve the object.

That is, the method for producing a coated fabric of the present invention is characterized in that after water-repellent treatment is applied to the fabric, the water-repellent present on the surface layer of one or both sides of the fabric is removed, and then coating is performed. It is.

[Function] In the present invention, when water repellency is imparted to the fabric by water repellent treatment,
As a result of intensive study on the fact that even when resin-treated, the adhesiveness with the resin is significantly reduced, we have actively removed the water-repellent agent present on the extreme surface of the fabric, without reducing its water-repellency. It was discovered that adhesiveness can be improved. That is, the present invention is characterized in that the water repellency of only the surface layer of the fabric is removed, but the water repellency of the inner layer of the fabric is left intact.

The fabrics used in the present invention include synthetic fibers such as polyester, aliphatic or aromatic polyamide, polyacrylonitrile, polyvinyl alcohol, polyvinyl chloride, and modified fibers thereof, wool, silk, cotton, linen, etc. A sheet-like material made of natural fibers, semi-synthetic fibers such as acetate, rayon, etc., or mixed fibers thereof, such as woven fabrics, knitted fabrics, non-woven fabrics, etc.

The first feature of the present invention is that these fabrics are subjected to water repellent treatment, and according to the present invention, a high degree of water repellency can be imparted to the final product.

For water repellent treatment, ordinary water repellent treatment methods can be used, that is, fluorine-based, silicone-based, paraffin, aliphatic amide, alkyl ethylene urea, etc. can be used as water repellents, but advanced water repellent In order to obtain this, fluorine-based water repellents are preferably used.

These water repellents are applied to fabrics in the form of an organic solvent solution or an emulsion dispersed with an emulsifier by methods such as padding, dipping, or spraying, dried at 100 to 130°C, and then Heat treatment at 160 to 180°C is performed as necessary.

As a water repellent treatment method other than the above, a method of subjecting the fabric to low-temperature plasma treatment in a fluorine gas or fluorine-containing compound gas atmosphere may also be employed.

The second feature of the present invention is to remove the water repellent present on the surface layer of one or both sides of a fabric that has been subjected to water repellent treatment.

As such a removal method, elution with a solvent, abrasion with cloth or sandpaper, etc. can be used, but sandblasting is particularly preferred.

Such sandblasting is a process in which small particles are caused to collide with the surface of a substance at high speed, thereby changing the properties or shape of the surface. According to this processing, the water repellent agent can be removed only from the extreme surface layer of the fabric.

The small powder particles are made of artificial and natural mineral particles,
Among these, acute polygonal hard particles are preferred. Furthermore, materials with relatively high specific gravity are preferred, such as alundum, carborundum, silica sand, silica stone, as well as iron, nickel,
Inorganic powder such as aluminum, especially metal powder, etc. is preferably used as the small powder. The particle size of small powder is 20-3
50 mesh is preferably used, but depending on the type of constituent fiber material of the fabric to be treated and the processing conditions,
The optimal grain size is different.

Such small particles are caused to fly at high speed using a jetting device using compressed air or a projection processing device using centrifugal force, and are made to collide with the fabric.

When using an injection device, the diameter of the injection nozzle is 2 to 10 mm.
, compressed air pressure is 1~10kg/cnf, injection distance is 5~
30CIn and a spraying time of 10 to 1000 seconds/M are preferably selected, but are not necessarily limited to these, and it is desirable to appropriately select the optimal conditions depending on the type and particle size of the small powder and the type of treated fabric. .

Such sandblasting is performed on one or both sides of the fabric depending on the purpose. In other words, it is possible to impart three different types of performance by imparting different types of performance to the front and back surfaces of the fabric, and further imparting different types of performance to the inner layer of the fabric.

The third feature of the present invention is that the sandblasted fabric surface is coated.

The coating process of the present invention is generally performed by
For example, a dry coating method or a wet coating method using coating methods such as a knife coating method, a roll coater method, a dip nip method, or a dipping method, or a lamination method can be used.

The resin used for such coating processing may be any resin that is normally used for coating processing. For example, polyurethane resin, polyacrylic resin, polyvinyl chloride resin, polyvinyl acetate resin, etc. can be used.

By adopting such a configuration, the present invention has been able to manufacture, for the first time, a coated fabric that satisfies both high water repellency and high adhesiveness.

[Example] Hereinafter, it will be explained in more detail with reference to Examples.

Note that the physical property values shown in Examples and Comparative Examples were measured by the following method.

(a) Strong peeling crab According to JIS K-1977, width 2
．． The measurement was performed using a strip-shaped test piece with 5 marks.

(b) Water repellency: Measured by the test method (spray method) specified in JIS L-1079.

(c) Water absorption height: 24 according to the water absorption rate measurement method B method (bisic method) specified in JIS L-1096.
The height of water absorption after a period of time was measured.

(d) Strike-through of coating resin: Evaluation was made by microscopic observation from the fabric surface.

Example 1, Comparative Examples 1 to 3 Plain woven fabric using 6 nylon yarns of 70 denier and 24 filaments as the warp and weft (warp density 122 threads/in)
, weft density 89/in) were scoured, dyed, and dried in a conventional manner. Then, the fabric was made into “NK Guard-270”
(Fluorine emulsion type water repellent agent manufactured by Nikka Kagaku Co., Ltd.)
After soaking in 40g/l aqueous solution and squeezing with a mangle, 120
It was dried at 170°C and heat treated at 170°C.

After that, one side of this water-repellent fabric was sprayed with a spray nozzle diameter of 5 m using 120 mesh white alundum particles.
m, compressed air pressure 2. '5kg/cnf, injection distance 25
Sandblasting was performed using a jetting method under the conditions of cm and jetting time of 45 seconds/a.

Next, the sandblasted surface of the fabric was coated with "Crisbon 8006HV" (polyester polyurethane resin:
Using a dimethylformamide solution (manufactured by Dainippon Ink Co., Ltd.), the coating was coated with a knife coater and then immersed in water for wet coagulation (Example 1).

The thickness of this coating film was 32 microns.

On the other hand, as comparative examples, dyed fabrics similar to those in Example 1 were not subjected to water repellent finishing or sandblasting (Comparative Example 1), and fabrics were subjected to only water repellent finishing similar to Example 1 (Comparative Example 2). As a weak water repellent finish, "Dick Guard F-70" (fluorine-based emulsion type water repellent finish manufactured by Nippon Ink Co., Ltd.) was soaked in a 30 g/l aqueous solution, squeezed with a mangle, dried at 120℃, and dried at 150℃. The heat-treated sample (Comparative Example 3) was also coated in the same manner as in Example 1.

Table 1 shows the peel strength of the coating film, the water repellency of the fabric surface, and the back-out of the coating resin of the obtained coated fabric.

As can be seen from Table 1, the coating according to the present invention did not cause the coating resin to bleed through, and had high peel strength and high water repellency.

Example 2, Comparative Examples 4 to 6 Twill fabric using 75 denier, 24 filament polyethylene terephthalate yarn as the warp and 75 denier, 36 filament polyethylene terephthalate yarn as the weft (warp density 129 threads/in, weft density 92 threads) / i
n) was scoured, dyed and dried in a conventional manner, and then subjected to the same water repellent treatment as in Example 1.

Both sides of this water-repellent fabric were coated with 80 mesh silica particles, spray nozzle diameter 5 mm, compressed air pressure 3. 0
Sandblasting was carried out using the injection method under the conditions of kg/al, injection distance of 20 cm, and injection time of 100 seconds/bo.

Next, both sides of the fabric were coated with “Hytran HW-111”
(polyurethane resin manufactured by Futari Nippon Ink Co., Ltd.) 75 parts, “Hytran HW-140” (polyurethane resin: manufactured by Dainippon Ink Co., Ltd.) 20 parts, “Dick Silicone Softener 500” (silicone-based softener: Dainippon Ink Co., Ltd.) made) 5
After coating the resin liquid with a knife coater, it was dried at 100°C for 10 minutes, and further heat-treated at 180°C for 30 seconds (Example 2). The thickness of this coating was 56 microns.

On the other hand, as comparative examples, dyed fabrics similar to those in Example 2 were treated without water-repellent treatment and sandblasting (Comparative Example 4), and those in which only the same water-repellent treatment as in Example 2 was applied (Comparative Example 5). Coating was also carried out in the same manner as in Example 2.

Table 2 shows the coating film peel strength and water absorption height from the cut surface of the obtained coated fabric.

As can be seen from Table 2, the products according to the present invention had high peel strength and also had extremely little water penetration through the cut surface due to capillary action.

[Effects of the Invention] The present invention can provide a coated fabric in which the peeling strength of the coating film is high even though it is a coated product of a water-repellent fabric, and the coating resin does not show through. . Furthermore, the coated fabric of the present invention can also prevent water from penetrating through the cut end surface due to capillary action.

Patent applicant Higashi Shikikai Co., Ltd.

Claims (2)

[Claims] (1) A method for producing a coated fabric, which comprises subjecting the fabric to water repellency treatment, removing the water repellent present on the surface layer of one or both sides of the fabric, and then coating the fabric. (2) The method for producing a coated fabric according to claim (1), wherein the treatment for removing the water repellent agent is sandblasting.