JPH0749626B2 - Method for producing metal-coated fiber - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for producing a fiber in which the surface of a chemical fiber is plated with metal.

(Prior Art) Conventionally, there have been a vacuum deposition method, a sputtering method, an electroless plating method, and the like for performing metal coating on a chemical fiber. The vacuum vapor deposition method and the sputtering method have a problem in that the equipment is expensive and the cost is low. Moreover, the obtained one has a weak adhesion, and there is a problem that the bending or the peeling occurs after one home washing. On the other hand, although the electroless plating method has a problem that adhesion obtained by the same method as the vacuum deposition method and the sputtering method has weak adhesion, it is noted that the cost is low and a uniform film can be obtained. Therefore, various studies have been conducted on methods for improving adhesion.

Generally, the electroless plating treatment of the fiber is performed through the steps of (1) roughening treatment, (2) sensitization treatment, (3) activation treatment, and (4) electroless plating treatment. Among them, the roughening treatment of (1) above is an important step that influences the adhesion of metal plating applied in the subsequent plating step,
Generally, there are two types of chemical roughening treatment and mechanical roughening treatment.
There are different types, but usually the latter is mainly carried out by the chemical roughening treatment. However, the one obtained by the above-mentioned method also has a weak adhesion to the fibers of the metal powder, and it is not satisfactory because it is bent or peeled off after one home washing, and the adhesive property of the metal powder is improved. It is the current situation that is strongly desired.

(Problems to be Solved by the Invention) The present invention has been made in view of the above situation, and an object thereof is to obtain a chemical fiber having a metal plating with good adhesion.

(Means for Solving Problems) The present invention has the following configuration in order to achieve the above-mentioned object. That is, in the present invention, after the chemical fiber is roughened, a resin having an affinity for the fiber and containing a metal salt is applied to the surface, and thereafter, sensitizing treatment, activation treatment, and chemical plating treatment are performed. The gist of the present invention is a method for producing a metal-coated fiber, which is characterized by performing electrolytic plating treatment.

Hereinafter, the present invention will be described in detail.

The chemical fibers referred to in the present invention are represented by polyamide synthetic fibers represented by nylon 6 and nylon 66, polyester synthetic fibers represented by polyethylene terephthalate, polyacrylonitrile synthetic fibers, polyvinyl alcohol synthetic fibers, and triacetate. Semi-synthetic fiber, regenerated fiber represented by viscose rayon, etc.

In the method of the present invention, the above-mentioned chemical fibers are woven, knitted,
A roughening treatment is applied in the form of a non-woven fabric. The roughening treatment may be performed in the form of yarn. There are mechanical and chemical methods for this roughening treatment, and the mechanical method of roughening the surface of the fiber with a knife etc. has the risk of significantly reducing the strength of the fiber, but caution is required. On the other hand, in the chemical method, since only the fiber surface layer is eluted with an inorganic chemical solution for surface roughening, the strength of the fiber is not significantly reduced. Therefore, the roughening treatment is preferably a chemical method.
The conditions for the surface roughening treatment performed by this chemical method may be appropriately determined depending on the type of chemical fiber. For example, in the case of polyester fiber, the concentration of sodium hydroxide aqueous solution having a concentration of 2 to 10% is used at a temperature of 80 to 95 ° C. The surface can be roughened by immersing it for several tens of minutes. As described above, in the method of the present invention, the fiber is first roughened, then thoroughly washed and dried.

Next, a resin having affinity with the chemical fibers forming the cloth and containing a metal salt is applied to the roughened fiber cloth. The resin referred to here is Al, Ca or other alkaline earth metal salt,
It means a polyurethane resin, an acrylic resin, a polyester resin, a polyamide resin, etc. containing a transition metal salt such as Cr, Fe, and Ni. The amount of the metal salt used is preferably in the range of 0.5 to 10% based on the weight of the resin. If it is less than 0.5%, the affinity with the metal to be plated is poor and the effect on the adhesion cannot be exerted. On the other hand, if it exceeds 10%, not only does it have the drawback of becoming brittle in terms of resin properties, but also in terms of adhesion.
It is disadvantageous because it does not change below%.

The resin to be used may be appropriately selected based on the type of chemical fiber and the flexibility of the resin itself. The amount of the resin containing the metal salt used is preferably in the range of 1 to 10% with respect to the weight of the fiber, considering both the affinity of the resin for the fiber and the affinity of the metal salt for the metal plating. 1%
If it is less than 10%, the salt adhesiveness is not improved, and if it exceeds 10%, the flexibility of the texture, which is a characteristic of a textile product, is impaired. Further, a great change in the adhesiveness is not expected, and it is advantageous from the viewpoint of cost. is not.

In order to apply the resin containing the above-mentioned metal salt, the roughened fabric is dipped in the resin solution, squeezed with a mangle and dried at a temperature of 100 to 120 ° C, or immediately after the dipping And the like, and may be appropriately determined depending on the type of cloth.

When heat treatment is performed for the purpose of increasing the affinity between resin and fiber, the treatment conditions are selected according to the type of chemical fiber, but generally, the temperature is 150 to 170 ° C for 30 to 60 seconds. It is advisable to perform heat treatment within the range.

In the method of the present invention, sensitization treatment and activation treatment are then performed. The purpose of this sensitization treatment and activation treatment is a step for depositing the catalytic noble metal before the chemical plating treatment, and these two steps are important steps for determining the uniformity of the plating.

The sensitizing step performed here is a step of adsorbing a relatively strong reducing agent on the fiber surface, and stannous chloride, hypophosphorous acid, hydrazine chloride, hydroquinone or the like can be used as the reducing agent. In the subsequent activation treatment step, the above-mentioned treated cloth is dipped in a catalyst solution containing a precious metal ion to deposit the precious metal on the surface of the fiber to accelerate the reaction with the metal to be plated in the next step.

In general, noble metals such as gold, silver, platinum and palladium are used as the catalyst. Among them, it is preferable to use palladium from the viewpoint of cost and uniformity of treatment. Regarding the conditions of the above-mentioned sensitizing process and the above-mentioned activating process, generally known normal conditions may be used.

In the method of the present invention, a chemical plating process is then performed. Regarding the chemical plating bath and the processing conditions in this chemical plating treatment, known conditions which have been conventionally practiced may be used. The chemical plating bath is composed of a metal salt, a reducing agent, a buffering agent, a pH adjusting agent and the like. Among these, metal salts such as silver, copper, nickel, cobalt, tin can be used as the metal salt, but copper and nickel are especially used in consideration of stability of the plating bath and ease of operation. Cheap. The reducing agent, the buffering agent, and the pH adjusting agent are determined by the metal to be plated, and may be appropriately selected as needed.

(Function) The metal-coated fiber of the present invention is a fiber obtained by interposing a resin layer containing a metal salt and having an affinity for the fiber at the interface between the fiber surface and the metal film. Therefore, at the interface between the fiber surface and the resin layer, the resin has a high affinity with the fiber because the affinity between the fiber and the resin is strong, and at the interface between the metal film and the resin layer, the resin is The metal salt contained in the above exhibits strong adhesion to the metal film. Thus, the metal coated chemical fiber according to the present invention has dramatically improved adhesion of the metal coating to the fiber.

(Examples) Next, the method of the present invention will be described in detail with reference to Examples. As for the evaluation of adhesion in Examples, a fully automatic washing machine NA
-Using 5580 type (Matsushita Electric Co., Ltd. product), 0.5g / l of liquid detergent Zabu Enzyme (Kao Co., Ltd. product) was washed at a temperature of 40 ° C for 10 minutes, and then at room temperature for 15 minutes. After rinsing, one cycle of dehydration and drying was defined as one wash, and this was repeated 5 times, and then the surface resistance was measured according to JIS C-6481. At the same time, the appearance change after washing was visually judged and evaluated.

Example 1 A woven fabric taffeta having a flat structure composed of polyethylene terephthalate fiber 75 denier / 48 filament raw yarn was prepared for both warp and weft, and was first degreased by refining treatment, and then the concentration was 4%.
Immerse it in the sodium hydroxide aqueous solution at 90 ℃ for 30 minutes,
After further immersing in 2% hydrochloric acid aqueous solution at room temperature for 10 seconds,
It was thoroughly washed in running water and dried. Thus, a woven fabric having a roughened surface was obtained.

Then, after sequentially performing the processes of the following steps (1) to (4),
A metal-coated polyester fiber woven fabric having a nickel plating layer of the present invention was obtained.

(1) Resin application step After immersing in the resin aqueous solution of the following resin formulation 1, draw ratio 50%
After squeezing with a mangle, and then drying at a temperature of 100 ° C for 1 minute, heat treatment was performed at a temperature of 170 ° C for 30 seconds.

Prescription 1 Hydran HW-140 10% sol (Polyurethane emulsion made by Dainippon Ink and Co., Ltd. with a solid content of 30%) Aluminum sulfate 0.1% sol (2) Sensitization process Stannous chloride 10g / l at room temperature After dipping in 4% aqueous solution of hydrochloric acid for 5 minutes, it was thoroughly washed with water.

(3) Activation treatment process At room temperature, add 5 g of palladium chloride 0.3 g / l hydrochloric acid 0.5% aqueous solution.
After soaking for a minute, it was thoroughly washed with water.

(4) Chemical plating treatment step After immersion in an aqueous solution (pH = 5) of the following formulation 2 at a temperature of 70 ° C. for 5 minutes, it was thoroughly washed with water and dried.

Formulation 2 Nickel sulphate 30 g / l Sodium hypophosphite 10 g / l Sodium acetate 10 g / l The performance of the obtained nickel woven fabric of the present invention was measured and evaluated, and the results are shown in Table 1.

For comparison with the method of the present invention, processing was carried out under exactly the same conditions as in this example except that the resin application step in (1) above was omitted in this example, and a nicknamed woven fabric for comparison was obtained. The performance was measured and is also shown in Table 1.

As is clear from Table 1, it was confirmed that the nickel woven fabric obtained by the method of the present invention was excellent in the adhesion of nickel metal.

(Effects of the Invention) The present invention is characterized in that, when electroless plating is performed on chemical fibers, a resin having affinity with the fibers and containing a metal salt is previously added to the roughened chemical fibers. According to the method of the present invention, the adhesiveness of the metal powder to the chemical fiber can be dramatically improved. The metal-coated chemical fiber product obtained by the method of the present invention is extremely useful for applications in the field of clothing or electromagnetic field.

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Claims (1)

[Claims] 1. A chemical fiber is surface-roughened, and then a resin having an affinity for the fiber and containing a metal salt is applied to the surface of the chemical fiber. Thereafter, sensitizing treatment, activation treatment, and chemical plating treatment are performed. A method for producing a metal-coated fiber, which comprises performing an electroless plating treatment as described above.