JPH07102476A - Production of metallized polyester fiber - Google Patents

Abstract

PURPOSE:To obtain firmly metallized polyester fibers by heat treatment of polyester fibers under specified conditions followed by caustic reduction and then electroless plating. CONSTITUTION:Polyester fibers are scoured in hot water at 80-95 deg.C for 1-2hr and then heat treated in an atmosphere at 190-225 deg.C for 10-120sec under a tension (extension) of 1-5% to relax their molecular sequence, and the resultant fibers are subjected to caustic reduction at 3-10wt.% in an aqueous sodium hydroxide solution followed by electroless plating, and then the firmly metallized polyester fibers excellent in washing resistance is efficiently obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for efficiently producing metal-coated fibers having excellent adhesion on the surface of polyester fibers by electroless plating.

[0002]

2. Description of the Related Art Generally, as a method for forming a metal film on the surface of a chemical fiber, a coating method, a metal plating method, a sputtering method, a vacuum deposition method and the like are known.
The coating method is a method in which a metal powder is kneaded with a synthetic resin and applied on the surface of the fiber, and unless the metal content in the resin is increased, the conductive performance is low, and the one in which a large amount of metal is kneaded has an adhesive property. It is low and has a drawback that the texture of the object to be coated becomes hard. Furthermore, the sputtering method and the vacuum deposition method require an expensive facility for maintaining a high vacuum environment and depositing metal vapor on the fiber surface. In addition, only one side can be processed in one treatment, and the same for both sides processing. There is a drawback that the operation must be repeated twice.

On the other hand, electroless plating on fibers is widely known, and related findings include Japanese Patent Publication No. 40-2740.
No. 0 discloses a method in which a synthetic resin is used for sealing the fiber surface, palladium chloride is applied, an electroless plating layer is provided, and electroplating is performed thereon. This method involves a complicated process of applying a synthetic resin to the fiber surface and performing electroplating to obtain good conductivity, which is a problem in operation.

Further, for metal plating of polyester fibers, a method is known in which a surface is subjected to etching treatment by utilizing a hydrolysis reaction with caustic to roughen the surface. For example, Japanese Patent Publication No. 49-43518 and Japanese Patent Publication No. 49-
No. 43519 discloses polyester fiber of 80 g / l.
It is disclosed that the surface is roughened by etching with an aqueous solution of sodium hydroxide at 50 ° C. for 1 hour. Although the above-described roughening treatment is recognized to have some effects, it was not able to withstand physical external forces such as washing.

[0005]

The problem to be solved by the present invention in a method of subjecting polyester fiber to electroless plating and forming a metal film thereon is to use a simple method without using a special device. It is an object of the present invention to provide a method for obtaining a metal-coated fiber having a metal film formed on a polyester fiber and having good adhesion which can endure ordinary washing.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems by refining polyester fibers in hot water of 80 to 95 ° C. for 1 to 2 hours, and then under tension of 1 to 5%.
The present invention relates to a method for producing a metal-coated polyester fiber, which comprises heat-treating for 10 to 120 seconds in an atmosphere of 225 ° C., then reducing the weight in an aqueous solution of sodium hydroxide by 3 to 10%, and then forming a metal film by an electroless plating method. .

Strains remain in the polyester fiber during spinning and weaving. In addition, there are wrinkles after weaving, folding wrinkles due to weaving, bending of weave, etc. These distortions,
It is common knowledge in the textile industry to normally heat-set to remove and correct folds and the like to stabilize dimensions, and generally heat-setting is performed under tension at 160-180 ° C for 20-30 seconds. ing.

[0008] The method provided by the present invention provides a method for removing fiber spinning, distortion during weaving, creases, weaving, etc.
After scouring in hot water of ~ 95 ° C, relaxation treatment, and drying, 1 at 1 ~ 5% tension in an atmosphere of 190 ~ 225 ° C.
Processing for 0 to 120 seconds. By the above-mentioned method, the polyester molecules aligned in the fiber axis direction by stretching during spinning are loosened by heat treatment at 190 to 225 ° C. and partially oriented randomly so that they are easily hydrolyzed by caustic. Hydrolysis by caustic is 8
Perform at 0-85 ° C. to reduce polyester fiber by 3-10%. By this treatment, the amount is peeled off from the surface, and the loosened portion of the molecular sequence is preferentially infiltrated to develop a large number of micropores. Palladium chloride, which is a catalyst for electroless plating, is deposited in the fine holes, and the adhesion of the metal plating film thereafter is significantly improved.

The polyester fiber used in the present invention is
The shape is not limited by threads, filaments, woven fabrics, knitted fabrics, non-woven fabrics, and the like.

[0010]

The polyester fiber is molecularly aligned in the fiber axis direction by spinning and drawing, and the surface is particularly hard and difficult to hydrolyze. When heat treatment is performed at a temperature at which the molecular arrangement becomes loose, the arrangement becomes random and hydrolysis with caustic becomes easy.

In the present invention, the above principle is applied to loosen the molecular arrangement, and then the surface is hydrolyzed with sodium hydroxide to roughen the surface, thereby forming a metal film having good adhesion and durability against washing on the polyester fiber. be able to.

The present invention will be specifically described with reference to examples.

[0013]

Example 1 A 135 mesh polyester gauze (filament diameter: 45 microns) was immersed in an aqueous solution of 2 g / l of a nonionic activator (Daisurf WS.20 manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.) at a bath ratio of 1:30 and at 80 ° C. It was degreased, scoured and relaxed for 1 hour. Then, the sheet was treated with a heat set machine maintained at 190 ° C. under 5% tension for 120 seconds. Furthermore, bath ratio 1:
80 in a 1g / l aqueous solution of sodium hydroxide under the conditions of 25
Hydrolysis treatment was performed at 1 ° C for 1 hour, resulting in a weight loss rate of 4.5%. When the obtained polyester gauze was immersed in an electroless plating solution having the following composition for 5 minutes at 40 ° C., a 12% uniform copper film was formed, and the surface electric resistance was measured.
It was 3 Ω / cm. Copper plating solution composition Copper nitrate 15 g / l Sodium hydrogencarbonate 10 g / l Tartrate 30 g / l 38% formalin solution 100 ml / l PH 11.5

[0014]

[Comparative Example 1] 135 mesh polyester gauze (filament diameter 45 micron) was degreased, scoured and relaxed under the same conditions as in Example 1, and then treated with a heat set machine kept at 165 ° C under 5% tension for 120 seconds. did. afterwards,
The hydrolysis treatment was performed under the same conditions as in Example 1, resulting in a weight loss rate of 4.1%. When the obtained polyester gauze was electroless plated under the same conditions as in Example 1, a 11% uniform copper film was formed and the surface electric resistance was measured.
It was 3 Ω / cm.

The samples of Example 1 and Comparative Example 1 were prepared under the same conditions,
Washing durability Using a household electric washing machine, JIS
As a result of the test according to the L 0217 103 method,
As shown in Table 1, the sample according to the method of the present invention is Comparative Example 1
It was confirmed that the washing durability was better than that of No.

[0016]

[Table 1]

[0017]

Example 2 A 250 mesh polyester gauze (filament diameter: 30 μm) was degreased and scouring relaxed under the same conditions as in Example 1, and then treated with a heat set machine kept at 200 ° C. under 3% tension for 100 seconds. . Next, hydrolysis treatment was carried out in a 1.5 g / l aqueous solution of sodium hydroxide at 80 ° C. for 1 hour under a bath ratio of 1:30, resulting in a weight loss rate of 6.2%. When the obtained polyester gauze was electroless plated under the same conditions as in Example 1, a uniform copper coating of 14% was formed and the surface electric resistance was measured.
Was Ω / cm.

[0018]

Comparative Example 2 A 250-mesh polyester gauze (filament diameter: 30 μm) was degreased and scouring relaxed under the same conditions as in Example 1, and then maintained in a heat set machine maintained at 175 ° C. under 3% tension for 100 seconds. . Then, hydrolysis treatment was performed under the same conditions as in Example 2, resulting in a weight loss rate of 5.5%. When the obtained polyester gauze was electroless plated under the same conditions as in Example 1, a 13% uniform copper film was formed and the surface electric resistance was measured.
Was Ω / cm.

The results of comparing the adhesion strengths of the plated metal coatings of Example 2 and Comparative Example 2 by the friction method are shown in Table 2, and the method of the present invention showed excellent adhesion strength. Measurement method Gakushin-type friction test: Load 20 according to JISL 0849
Rubbed 50 times with 0 g.

[0020]

[Table 2]

[0021]

Example 3 250 mesh polyester gauze (filament diameter: 30 microns) was dipped in a 3 g / l aqueous solution of nonionic activator (Meisei Chemical Co., Ltd., Meise-7) at a bath ratio of 1:30 to obtain 8
It was degreased, scoured and relaxed at 5 ° C for 2 hours. It was then treated in a heat set machine maintained at 215 ° C under 5% tension for 40 seconds. Further, hydrolysis treatment was carried out under the same conditions as in Example 2, resulting in a weight loss rate of 6.4%. The obtained polyester gauze is applied to an electroless nickel plating solution having the following composition 32
When immersed at 6 ° C for 6 minutes, a uniform nickel film of 9% was formed. The surface electric resistance was measured and found to be 2.0Ω /
It was cm. Nickel plating solution composition Nickel hypophosphite 28 g / l Boric acid 12 g / l Ammonium sulfate 3 g / l Sodium acetate 5 g / l PH 6.0

[0022]

[Comparative Example 3] 250 mesh polyester gauze (filament diameter: 30 microns) Degreasing, scouring, under the same conditions as in Example 3.
After the relaxation treatment, a heat set machine maintained at 185 ° C. was treated under 5% tension for 40 seconds. Next, hydrolysis treatment was performed under the same conditions as in Example 2, resulting in a weight loss rate of 6.0%. When the obtained polyester gauze was electroless plated under the same conditions as in Example 3, a uniform nickel film of 8% was formed, and the surface electric resistance was measured to be 2.1Ω.
Was / cm.

The results of comparing the adhesion strengths of the metal coatings of Example 3 and Comparative Example 3 by the cellophane tape peeling method are shown in Table 3.
As described above, the adhesive strength of the method of the present invention was excellent. Measurement method Cellophane tape method: A commercially available cellophane tape is cut into 5 cm, and strongly bonded to the test surface. After 10 minutes, the cellophane tape was peeled off at once, and the degree to which the metal film was peeled off and transferred to the cellophane tape was visually evaluated.

[0024]

[Table 3]

[0025]

According to the present invention, the strain of the polyester fiber is removed, the molecular arrangement is loosened, and then the surface of the polyester fiber is peeled and soaked by caustic treatment to develop a large number of fine pores. Therefore, when copper or nickel or the like is plated by the electroless plating method, it is possible to obtain a metal-coated polyester fiber having excellent adhesion and washing durability.

Claims (1)

[Claims] 1. A polyester fiber is smelted in hot water at 80 to 95 ° C. for 1 to 2 hours, and then 1 to 5% under tension 190 to 90%.
A method for producing a metal-coated polyester fiber, which comprises heat-treating for 10 to 120 seconds in an atmosphere of 225 ° C., then reducing in a sodium hydroxide aqueous solution by 3 to 10%, and then forming a metal film by an electroless plating method.