JPS60173191A - Partial conductivity imparting method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for obtaining a partially conductive material in an arbitrary pattern by electroless plating on a fabric made of a fiber material.

The proportion of synthetic fibers in textile materials is on the rise. This is due to the excellent physical and chemical properties of synthetic fibers.

However, on the other hand, drawbacks of synthetic fibers have also been pointed out. Among them, problems caused by static electricity have become a particular problem, such as the occurrence of clinging of clothes in daily life,
Static electricity generated by electronic component handlers when their work clothes shift has caused negative effects such as product stagnation and deterioration. A commonly used method to prevent these problems is to add ionic substances using antistatic agents during post-processing.
It has little effect under harsh conditions of low humidity.

Furthermore, in recent years, with the increasing precision of electronic devices and the use of plastic housings, interference due to electromagnetic waves has been pointed out, and the need for electromagnetic shielding has increased. In order to obtain an electromagnetic wave shield, it is not possible to cover the area with antistatic agents, and a material with more conductivity is required.

Methods of actively imparting conductivity to fabrics include woven or knitted fabrics by mixing metal fibers themselves or fibers doped with conductive substances such as conductive carbon with ordinary fibers, or by woven or knitted fabrics. In response, methods have been proposed in which metals are deposited on the fiber surface. In the former method of obtaining conductivity using conductive fibers, it is necessary to adjust the number of conductive fibers and weave design depending on the degree of conductivity required, and there are other problems such as breakage of the conductive yarns. . On the other hand, in the latter method of imparting conductivity to the fabric through electroless plating, the metal is generally applied to the entire fabric, and the fabric surface only exhibits a metallic color, resulting in a significant increase in overall weight and the loss of the original fiber properties. Performance such as texture is impaired, and furthermore, the cost of processing increases significantly. As a method to compensate for these drawbacks, palladium chloride or the like is printed on a fabric that has been previously coated with a reducing agent to precipitate the reducing catalyst metal, and then the metal is partially applied only to the printed area using electroless plating solution treatment. A deposit method (Japanese Unexamined Patent Publication No. 57-210968) has been proposed. However, this method is commonly used for plastic plating, in which the reducing agent is first applied to the entire fabric in the low p)l region, so in pre-dyed fabrics, it is necessary to stage the dye or apply the catalytic metal. There was a drawback that the metal deposition was likely to be incomplete, and the metal was deposited in areas other than the printed areas. In order to overcome these drawbacks, the present inventors have conducted extensive research and have arrived at the present invention.

That is, in applying a reduced catalyst metal to a fabric, the present invention uses a salt of the catalyst metal stabilized by a complex, a reducing agent, and a viscous substance so that the catalyst metal does not precipitate at room temperature even if a reducing agent is added. to prepare a viscous substance (hereinafter referred to as paste) containing a metal salt and a reducing agent whose viscosity is adjusted to a predetermined value.

Next, the paste is applied to the fabric in an arbitrary pattern and then heat treated to precipitate the C1 catalyst metal on the fiber surface.
This method is followed by treatment in an electroless plating bath, thereby depositing metal only on the paste-applied area, thereby making it partially conductive.

According to the present invention, no metal is deposited in areas other than the paste-applied areas, and on the contrary, in the paste-applied areas, the edges are sharp and uniform metal deposition is observed. The metal adheres well to the fabric, has excellent washing resistance and bending abrasion resistance, and has good electrical conductivity in the metal parts deposited along the pattern.

Embodiments of the present invention will be described.

As the metal having reduction catalytic ability, metals belonging to the platinum group such as platinum, palladium, ruthenium, osmium, rhodium and iridium are preferably used. Among these platinum group metals, one type can be used alone or two or more types can be used in combination. The catalyst metal may be made into an aqueous solution in the form of a water-soluble mineral acid salt such as a hydrochloride or a nitrate, and a complex may be formed with an amino acid, an aminocarboxylic acid, an aminoalcohol, a carboxylic acid, an alcohol, a hydroxycarboxylic acid, etc. This stabilizes the metal so that it does not precipitate at room temperature even when a reducing agent is added. More specifically, amines that can be used as complexing agents include ammonia, methylamine, ethylamine, aniline, ethylenediamine, diethylenetriamine, hexamethylenetetramine, etc., and aminocarboxylic acids include glycine, ethylenediaminetetraacetic acid, etc. Amino alcohols include ethanolamine, jetanolamine, triethanolamine, etc., carboxylic acids include oxalic acid, succinic acid, maleic acid, phthalic acid, etc., and alcohols include ethylene. Examples of hydroxycarboxylic acids include glycol, diethylene glycol, and glycerin, and examples of hydroxycarboxylic acids include glycolic acid, tartaric acid, citric acid, and salicylic acid. What can be used as a reducing agent is phosphorus
ii, sulfuric acids, and aldehydes; more specifically, phosphoric acids include phosphinic acid, phosphorous acid, etc., and their salts; sulfuric acids include dithionite, sulfinic acid, sulfite, etc., and their salts, and aldehydes. Types of substances include formaldehyde, acetaldehyde, glucose, etc.

The viscous substances used in the present invention include natural thickeners such as wheat flour starch, guar gum, and sodium alginate, processed thickeners such as cellulose and starch substituted with methyl, ethyl, hydroxyethyl, carboxymethyl, etc., polyvinyl alcohol, and polyvinyl alcohol. Synthetic glue such as sodium acrylate and
O/W type emulsion glue can be used. These are 1
Although two or more types of adhesives may be blended, formulations in which sizing agents react with each other and result in poor desizing properties are excluded. Preferably,
A sizing agent with a low solid content that does not hinder the movement of the precipitated catalyst metal to the fiber layer is preferable. As for the viscosity of the paste, it is necessary to change the amount used to obtain the optimum viscosity depending on the application method, but it can be used in the range of i,ooo to 50,000 cps.

The paste can be applied using a printing machine such as a rotary screen, a flat screen, or a roller engraved with an arbitrary pattern. Also, knife coater,
Using a coating machine such as a gravure coater, it is possible to apply paste only to the surface without going through the back.

In addition, after the paste is applied to the fabric in an arbitrary shape using a means that can be applied, a dry heat treatment or a wet heat treatment is performed at 50° C. to 200° C. through a preliminary drying step.

Through this treatment, the catalytic metal salt is reduced and fixed as a catalytic metal on the fabric as per the pattern.

A preliminary drying step may be performed if necessary, but may be omitted.

The fiber materials used in the present invention include plant fibers such as cotton and linen, animal fibers such as wool and silk, mineral fibers such as asbestos, recycled fibers such as rayon and cupro, semi-synthetic fibers such as acetate, nylon, and polyester. , synthetic fibers such as acrylic fibers, and non-tamped fibers such as glass fibers, used alone or in combination of two or more, interwoven, interwoven, and nonwoven fabrics.

As described above, by the method of the present invention, it is possible to obtain a fabric with good partial conductivity, which has a sharp edge and no metal deposits other than the pattern, which was not previously possible.

The present invention will be described below with reference to Examples, but is not necessarily limited thereto.

Example 1 A palladium chloride solution is prepared by adding 3 ml of concentrated hydrochloric acid (35%) and water to 0.5 g of palladium chloride to make a total volume of 100 ml. After adding 30 ml of the above palladium chloride solution to 20 ml of ammonia water (25%) to form a palladium ammine complex, 70 g of Grape tJi and 600 gr of a 10% solution of Maplogum NP (manufactured by Sansho Co., Ltd.) were added, and the total amount was made up to 1000 g with water. Make a thick paste. Polyester processed yarn twill fabric (weighing 200g/ff
For r), the above paste was printed with a lattice pattern using a flat screen printing machine, dried at 100"cxa, and then subjected to high temperature steam treatment at 105°C for 10 minutes. This fabric was coated with 0.5 g of EDTA. After thoroughly washing in 80°C water containing
When immersed at ℃ for 1 hour, a plated product with metallic luster was obtained only in the printed area.

Nickel plating bath Nickel chloride 20g Sodium citrate 30g Ammonium chloride 15g Borax 5g Sodium phosphinate 10g Aqueous ammonia (25%) 35mJ/Water to make the total amount 10100O+ Example 2 Ethylenediamine l Chloride prepared in Example 1 to Omj+ After adding 20ml of palladium solution to make a homogeneous solution, 40g of sodium phosphinate and Fuji Hesoku AH1
5 (Fuji Chemical Department) Add 600g of 8% solution and make a total amount of 1000g with water to prepare a viscous paste.

Polyester/cotton blend (65% polyester, 35% cotton)
The above viscous paste was printed in a striped pattern on a plain woven fabric (basis weight 120 g/rrr) using a roller printing machine, dried at 100°C for 2 minutes, and then subjected to high temperature steam treatment at 180°C.
℃×5 minutes. After washing this fabric with water, it was immersed in a chemical copper plating bath shown below at 20° C. for 2 hours. Metallic copper was plated only on the printed striped portions, and no other portions were deposited at all. When the conductivity of the printed part was measured using a tester, it was found to be very good.

Chemical copper plating Copper sulfate 10g Sodium potassium tartrate 30g Formalin (contains 37% formaldehyde) 100m7
Example 3 Add 0.2 g of palladium chloride to 2 mj of concentrated hydrochloric acid (35%)!
And 100m1 of water! After addition and melting, 30 g of sodium phosphinate and 10.000 g of Marborose M
(manufactured by Matsumoto Yushi) was added in an amount of 500g, and the total amount was made up to 1.000g with water to prepare a viscous liquid.

Apply this viscous liquid using a knife coater to nylon taffeta (8
0g/cd fabric weight) was applied to one side (application amount: 20g/durability), dried at 100°C for 1 minute, subjected to dry heat treatment at 150°C for 2 minutes, and then washed with water. As a result of immersing this in the cobalt plating bath shown below at 80°C for 1 hour,
A fabric was obtained in which no metal was deposited on the back surface of the coating, and only the surface was coated with cobalt.

Cobalt chloride 20g Sodium citrate 30g Sodium phosphinate 10g Aqueous ammonia (25%) 30g Water Make the total volume to 1000 ml with the remainder/water Example 4 Dissolve 0.1 g of platinum chloride in water, and add 1 g of sodium ethylenediaminetetraacetate. Add to make the total amount 100me. Take 40 ml of this, add 10 g of glucose, 2 g of sodium bicarbonate, and Duck Algin N5PH (manufactured by Kamogawa Kasei).
Add 650g of 6% solution and make total volume with water i,00
The paste was printed in a striped pattern using a low clima screen printing machine on an acrylic twill fabric (basis weight 220 g/r+f) to make a viscous paste prepared to 0 g.
After drying at 0° C. for 2 minutes, high-pressure steaming treatment at 105° C. for XIO minutes, washing with water, and drying. When the fabric was treated in an electroless nickel plating machine shown below at 90°C for 30 minutes, a product was obtained in which nickel was precipitated only in the areas to which the paste was applied.

nickel plating bath Nickel sulfate 30g Sodium acetate 10g Ammonium sulfate 20g Sodium phosphinate 10g water remaining / Make the total amount 1000 mJ with water.

patent applicant

Claims (1)

[Claims] After adjusting the viscosity to a predetermined value by adding a viscous substance to an aqueous solution containing a reducing agent and a salt of a metal with catalytic ability that has been stabilized so that the catalytic metal does not precipitate at room temperature even if a reducing agent is added, A method for making a fabric partially conductive, comprising partially applying a viscous substance containing the metal salt and a reducing agent to the fabric, heat-treating the fabric, and then subjecting the fabric to electroless plating.