JP2002155470A - Method for producing fabric having water-repelling property and water-absorbing property - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a fabric to both whose sides a water-repelling property and a water-absorbing property are imparted, respectively, and which does not cause the hardening of touch feeling. SOLUTION: This method for producing the fabric having the water-repelling property and the water-absorbing property is characterized by imparting a water-repelling agent to two fabrics, tightly superposing both the water-repelled fabrics each other and then irradiating the superposed fabrics with plasma from both the outsides of the superposed fabrics.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a two-sided fabric having a water-repellent property on one surface and a water-absorbing property on the other surface.

[0002]

2. Description of the Related Art In general, the human body constantly evaporates water from the skin surface for the purpose of controlling body temperature. The amount of sweating is higher than usual. Therefore, when the temperature / humidity of the space between the clothes and the skin rises and reaches a saturated state, it causes stuffiness and discomfort.

[0003] On the other hand, in some textile products such as sportswear and uniforms, a process of repelling water, that is, a so-called water repellent process, has been applied to the surface of the fabric. There are several known water-repellent methods, but a typical method using a fluorine-based water-repellent agent is widely used, and the treatment is performed by coating the surface of a fabric.

The above-mentioned fluorine-based water repellent contains a copolymer obtained by copolymerizing a fluorine-based monomer (a monomer containing a perfluoroalkyl group) with another monomer,
As one example of the production method, JP-A-6-228534 discloses that a fluorine-based monomer and a non-fluorine-based monomer are emulsified in water, replaced with nitrogen, and stirred for several hours in a range of 50 to 80 ° C. Dissolving or dispersing a copolymer obtained by copolymerization in an organic solvent or water.

[0005] However, if the above-mentioned water repellent treatment is applied to the inside of the garment, air permeability is reduced and moisture such as sweat is not released, which causes discomfort. Although it is preferable that the water-repellent finish is applied to a thin fabric by a conventional coating, both surfaces are made water-repellent by passing through, so the material such as the thickness and the weaving density of the fabric is limited. There is a problem that the fabric is hardened by applying the water repellent coating.

[0006] As a method of performing different processing on the front and back surfaces of the fabric, a method of dyeing different colors on the front and back in Japanese Patent Application Laid-Open No. 52-110894, specifically, "Putting a fibrous structure through a dye / pigment liquid and pressing When the fiber structure is continuously dyed after the liquid drying, the two fiber structures are overlapped so that the surfaces are in close contact with each other, and passed through the dye / pigment liquid at 40 to 80 m / min. After padding, the roll is pressed between two rolls to a squeezing ratio of 20 to 90% to remove excess dye and pigment liquid, and at the same time, the dye and pigment liquid is evenly applied to the surface of the fiber structure. At the same time, both sides of the superposed fiber structure are uniformly dried at 80 to 150 ° C. to cause migration of dyes and pigments, and dyeing different in density or hue between the polymerized surface and the non-polymerized surface of the fiber structure. Characteristic dyeing of fiber structures Law "is disclosed.

[0007] However, Japanese Patent Application Laid-Open No.
When water repellent treatment is performed in accordance with the technical idea of No. 84, one surface, that is, the “non-polymerized surface” in the above invention shows high water repellency, but the other surface, that is, the “polymerized surface” in the above invention Not exhibit sufficient water absorption performance, and the fabric as a whole will not have a comfortable wearing feeling,
Further, the texture became slightly hard, and was unsuitable as a cloth for clothing.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has a water repellent property on one surface and a water absorbing property on the other surface, and has no hardened texture. It is an object of the present invention to provide a method for producing a fabric.

[0009]

The above object is achieved by the following invention. The first invention is characterized in that after applying a water repellent to the fabric, the two fabrics are superimposed so as to be in close contact with each other, and then the two superimposed fabrics are irradiated with plasma from both sides. Method, and
In the second invention, after a water repellent is applied to two fabrics which are superimposed so as to be in close contact with each other, these fabrics are once separated, and then the inside of the two fabrics ( The method is characterized in that the two sides of the two fabrics are irradiated with plasma from the outside from both sides, and then the two fabrics are overlaid so that the surface which has been the close contact side is outside.

[0010]

Embodiments of the present invention will be described below. The fabric in the present invention refers to a form on a sheet made of fibers such as a woven fabric, a knitted fabric, and a nonwoven fabric, and particularly to a fabric originally made of hydrophilic fibers such as a cellulosic fiber and a protein fiber.

As the above water repellent, fluorine water repellents,
General textile water repellents such as silicon-based water repellents can be used. Particularly, JIS L-10
It is preferable to use those exhibiting water repellency of 100 points at the initial stage and 70 points or more after 10 washes in the 92 method.

Next, the above-mentioned “plasma irradiation” refers to FIG.
A pair of discharge electrodes (2) is provided in a closed chamber (1) as described above, a specific amount of a specific gas is introduced, and air in the closed chamber (1) is blown by a vacuum pump (not shown) provided. This is performed by a device having a structure capable of exhausting and maintaining a low pressure state at a constant pressure. When a voltage is applied to the electrode (2) in the apparatus, a glow discharge occurs, and the introduced gas becomes a plasma state at a low temperature, and the cloth to be treated (3) passing through such an apparatus is irradiated with the plasma. It becomes possible.

Next, the operation state of the present invention will be described step by step. First, after weaving, a water repellent is applied to the fabric that has been subjected to a pretreatment such as desizing or scouring. As a method for applying the water repellent, a method such as a pad nip method, a spray method, or an immersion method can be applied, and 0.5 to 15.
It is preferable to provide 0% by weight of the water repellent. When the amount of the water repellent is less than 0.5% by weight, poor water repellency results, and when the amount exceeds 15.0% by weight, there are problems such as hardening of the hand, reduced strength, and discoloration.

In applying the water repellent to the fabric, a method of individually applying the water repellent to two pieces of fabric and then superposing them on each other as described in the first invention, There is a method of applying a water repellent agent to two superposed fabrics as described in the invention of the above, then turning over these fabrics and superimposing them again, but the second method has a difference in front and back function. Are remarkable and have excellent water repellency and water absorption. At the time of overlapping, it is important that the two fabrics be brought into close contact with each other with sufficient care so as not to cause displacement of both ends and wrinkles of the fabric surface.

Thereafter, the two superposed fabrics are put into a closed apparatus for low-temperature, low-pressure plasma processing. Japanese Patent Application Laid-Open No. 58-65059 and Japanese Patent Application Laid-Open No. 9-47
There is known a continuous low-temperature plasma processing apparatus as disclosed in Japanese Patent Application Laid-Open No. 16-163, and other batch-type low-temperature plasma processing apparatuses.

The low-temperature plasma treatment will be described in detail. First, the cloth to be treated is 40 to 13300 Pa.
(0.3 to 100 Torr). At this time, the closed chamber is filled with one or more of various gases such as oxygen, nitrogen, argon, helium, ammonia, and air. Then, a high-frequency power of about 5 to 500 w / cm ² (electrode unit area) is applied to the electrode plates disposed so as to sandwich the running path of the fabric from both sides, and plasma is generated, and irradiation is performed for 20 to 240 seconds. When the processing apparatus is of a continuous type, the irradiation time can be appropriately changed by adjusting the running speed of the cloth.

By performing such processing, it is possible to improve the hydrophilicity on the outer surface of the two superposed fabrics (3) as shown in FIG. 2 (enlarged view of part A in FIG. 1). .

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail based on embodiments.

(Example 1) First, a cotton yarn of 20th count (English style cotton count; 29.5 tex) was used to obtain 46 yarns / cm in length.
After producing a 100% cotton twill fabric at a weave density of 20 weaves / cm, the fabric was treated in the order of desizing, scouring, bleaching, mercerizing, and dyeing. Subsequently, after applying a water-repellent treatment liquid of the following formulation, the liquid was squeezed to a squeezing ratio of 65%, dried at 120 ° C for 2 minutes, and then baked at 150 ° C for 3 minutes. (Water repellent treatment liquid) Asahigard AG-415 50 g / l (Fluorine water repellent manufactured by Meisei Chemical Co., Ltd.) Meikanate MF 30 g / l (block isocyanate binder manufactured by Meisei Chemical Co., Ltd.)

Thereafter, the two water-repellent fabrics are superimposed on each other, put into a continuous low-temperature plasma processing apparatus manufactured by Shandong Iron Works Co., Ltd., and run while the superimposed fabrics are running. The fabric of Example 1 was manufactured by irradiating plasma in the apparatus. The plasma processing conditions at this time were set as follows. Atmospheric pressure in the device 1.33 × 10 ² Pa (1 Torr) Irradiation power 7 kW Irradiation time 90 seconds (cloth running speed in the device: 7 m /
Minutes)

(Embodiment 2) Next, two twill woven fabrics similar to those in Embodiment 1 are first superposed, and a treatment liquid having the same formulation as in Embodiment 1 is applied. Then, these two cloths are superposed. While squeezing simultaneously to a squeezing ratio of 65%, 120 ° C x
After drying for 2 minutes, baking treatment was performed at 150 ° C. for 3 minutes.

Thereafter, as shown in FIG. 3, the two cloths superposed so as to be in close contact with each other are separated once,
When applying the water-repellent treatment liquid, the two cloths are turned upside down such that the inside (the surface that was in close contact) (4) is on the outside and the outside (the surface that was not in close contact) (5) is on the inside. , So that they adhered closely.

The two superposed fabrics are again put into a low-temperature plasma processing apparatus similar to that of the first embodiment,
In addition, the fabric was irradiated with plasma under the same conditions to obtain the fabric of Example 2.

(Comparative Example 1) After using the same twill fabric as in Example 1 and applying the water-repellent treatment liquid of the same formulation, the drawing ratio was 6
Squeeze the solution so as to obtain 5%, and superimpose two sheets of this cloth to obtain 1%.
After drying at 20 ° C. × 2 minutes, baking treatment was performed at 150 ° C. × 3 minutes. Thereafter, this fabric was used as a fabric of Comparative Example 1 without performing plasma treatment.

(Comparative Example 2) After calendering only one surface of the twill fabric similar to that in Example 1 to smooth the fabric surface and suppress liquid penetration, a water-repellent treatment solution having the following formulation was used. The viscosity is 35,000 to 40000C by mixing the thickener.
It was adjusted so as to be between PS, the coating agent thus obtained was applied to the fabric, and dried at 140 ° C. for 1 minute, and then baked at 150 ° C. for 3 minutes. (Water repellent solution) Asahi Guard AG-415 25.0 parts by weight (Fluorine water repellent manufactured by Meisei Chemical Industry Co., Ltd.) Meikanate MF 1.5 parts by weight (Block isocyanate type binder manufactured by Meisei Chemical Industry Co., Ltd.) Water 73 0.5 parts by weight (thickener) AG Viscosizer 4.0 parts by weight

Thereafter, the following water-absorbing processing liquid was applied to the calendered surface, and dried at 120 ° C. for 2 minutes. (Water absorption processing liquid) SR1800 30g / L (Takamatsu Oil & Fat Co., Ltd. polyester-based water-absorbing agent)

The results of measuring the water repellency and the water absorption of the fabrics of Examples 1 and 2 and Comparative Examples 1 and 2 thus produced are shown in the following table.

[0028]

[Table 1]

As a result, the cloth of Comparative Example 1 in which two sheets were superposed and heat-treated after applying the water-repellent agent but not subjected to the plasma treatment, although the desired water-repellency was obtained, the water-absorbing property was low. It was insufficient and the texture was somewhat hard. The fabric of Comparative Example 2 obtained by the conventional coating method had a rough and hard texture peculiar to the coating process and was extremely poor in air permeability due to the coating with the coating agent. In contrast,
The fabric of Example 1 in which two sheets were heat-treated after being subjected to the water-repellent treatment and further subjected to the low-temperature plasma treatment became preferable for both the water-repellent property and the water-absorbent property for clothing, and the texture did not change as compared with that before the treatment. . Further, the fabric of Example 2 in which two sheets were subjected to the water-repellent treatment, then turned upside down, and then subjected to the heat treatment and the low-temperature plasma treatment, the water-repellent surface had better water-repellent performance as compared with the above-mentioned Example 1. In addition, the water-absorbing surface had more excellent water-absorbing performance and exhibited remarkable front and back functions.

[0030]

As described above, according to the method of the present invention, it is possible to produce a two-sided function having water repellency on one surface and water absorption on the other surface without impairing the feel. Further, since the processing of two sheets is performed at the same time, there is an effect that the production can be efficiently performed without incurring a decrease in productivity, even though the cloth is a high-performance cloth.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a continuous low-temperature plasma processing apparatus.

FIG. 2 is an enlarged view of a portion A in FIG. 1 and is a conceptual diagram showing low-temperature plasma processing on a fabric.

FIG. 3 is an explanatory diagram showing a state in which the fabric is turned over and overlaid.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed room 2 Electrode 3 Fabric to be treated 4 Surface which adhered at the time of water repellent treatment 5 Surface which did not adhere at the time of water repellent treatment

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3B154 AA02 AB20 AB21 AB22 BA15 BB26 DA16 DA30 4L031 AA02 AB31 AB32 CB05 4L033 AA02 AB04 AB05 AC03 AC07 CA22

Claims (2)

[Claims] After applying a water repellent to a fabric, the fabric is treated with 2
A method for producing a water-repellent and water-absorbing cloth, comprising laminating the two cloths so as to be in close contact with each other, and then irradiating the two superposed cloths with plasma from both outer surfaces. 2. A water-repellent agent is applied to two fabrics which are superposed so as to be in close contact with each other, and then these fabrics are separated one by one. After having been turned over so that the surface which was the (close contact side) is on the outside, the two superposed fabrics are irradiated with plasma from both outside surfaces, and have water repellency and water absorbency. Fabric manufacturing method.