JPH03260168A - Metal plated acrylic yarn - Google Patents

Abstract

PURPOSE:To provide acrylic yarn with excellently low electric resistance and metallic luster even with small thickness of plating by subjecting acrylic yarn consisting of acrylonitrile and a metallic salt of vinyl (monomer) sulfonic acid to chemical plating of copper and/or nickel and then plating the yarn with gold or silver. CONSTITUTION:Alkali-resistant acrylic yarn comprising >=95wt.% acrylonitrile and a metallic salt of vinyl (monomer) sulfonic acid is treated with palladium made acidic with hydrochloric acid and with hot aqueous solution of caustic sodium as pretreatment and subjected to chemical plating with copper and/or nickel as substrate plating. Then the acrylic yarn is plated with gold or silver. >=0.005mum, preferably 0.01-0.04mum thickens of each plating is sufficient for antistatic uses.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to decorative textile products such as clothing, and conductive textile products.

(Problems to be solved by the prior art and the invention) As a method of metal plating fibers, for example, Japanese Patent Application Laid-Open No. 61215
There is a method using palladium hydrosil described in Japanese Patent No. 069. It is said that it has excellent conductivity and is effective as an antistatic agent, but the weight of the metal coated metal is 64% by weight or more based on the weight of the thread, and it has the disadvantage that the amount of plating is large.

Furthermore, for example, there is a gold plating method of under-plating copper or copper/nickel plating described in JP-A-56-63084, but the weight of the metal is 33% or more of the weight of the thread (
The amount of metal is about half), but it still has the disadvantage of having a large amount of plating. When the amount of plating increases, expensive precious metals are used, which leads to an increase in cost, which is a major practical problem. In addition, those with decorative patterns were limited in practical use to patterns on woven bodies.

(Means and effects for solving the problem) The present inventors have studied various compositions of fibers to be plated, and as a result, have arrived at the present invention.

That is, the present invention is a patented fiber (product) characterized in that an acrylic fiber made of acrylonitrile and a vinyl sulfonate monomer is plated with copper and/or nickel, and then electrolessly plated with gold or silver. be.

Acrylic fibers are usually copolymerized with methyl acrylate or vinyl acetate, but the acrylic fibers used in the present invention are a two-component system with a sulfonic acid metal salt vinyl monomer. The weight ratio of acrylonitrile to the sulfonic acid metal salt vinyl monomer is preferably 95% by weight or more. Particularly preferably, it is 97% by weight or more. It is preferable for the sulfonic acid metal salt vinyl monomer to be present in an amount of at least 1% by weight from the viewpoint of spinnability of the acrylic fiber.

Examples of the sulfonic acid metal salt vinyl monomer include sodium allylsulfonate, sodium methallylsulfonate, sodium styrenesulfonate, and sodium acrylamide methylpropylsulfonate. Potassium salt may be used instead of soda salt, but soda salt is preferred because it is cheaper.

The polymerization method is the conventional radical 'G? lji, F.
M-polymerization, subvention polymerization, and emulsion polymerization may be used, but it is better to avoid emulsion polymerization because the surfactant may have an adverse effect on the properties of the fiber.

The degree of polymerization of the polymer may be within the generally used fiber-forming range, but when particularly strong strength is required, a higher degree of polymerization is preferable, and a lower ratio of low polymerization degree is preferable.

The electroless plating used in the present invention may be performed by a known method, but the thickness of the gold or silver is determined by plating copper or/and nickel on the base to obtain the desired low electrical resistance when plating gold or silver. It is small in size and is advantageous in terms of cost. Also, if you apply gold or silver plating until it becomes low electrical resistance,
Brings a metallic luster.

The thickness of the underlying copper or/and nickel is o, o o s
It is sufficient if the thickness is 1 μm or more, preferably 0.01 to 0.04 μm. The thickness of the gold or string is 0.005 μm or more, preferably 0.01 to 0.04 μm, which is sufficient for antistatic purposes.

The acrylic fibers that undergo electroless plating can be of any shape, such as filament cut fibers, threads, cloth, non-woven fabrics, etc., but the smaller the specific surface area of the single fiber, the better! I] The thicker the fineness, the better the conductivity. However, when used as decorative gold thread, it is preferable for the fiber cross section to be flat in order to increase luster. For decorative purposes, nickel is preferable to copper as the base plating is brighter.

(Effect of the invention) The most important point of the present invention is that by using a new acrylic fiber with strong alkali resistance, the fibers do not swell during electroless plating or pretreatment and can maintain denseness. As a result, electroless plating inside the fiber does not act unnecessarily, the loss of plating metal is reduced, and low electrical resistance and excellent metallic luster can be obtained with a small amount of metal plating.

Compared to thin gold wire of equal weight, it is easy to obtain greater strength and is more processable as a fiber.

The metal-plated acrylic fiber of the present invention has high resistance to oxidation and chemicals, and is used as decorative fiber for clothing, antistatic textile products mixed in carpets, work clothes, etc., and as a reflective material or shielding material for electromagnetic waves. It is useful as

(Example) Next, the present invention will be explained in more detail with reference to Examples and Comparative Examples. Note that the percentages described below are percentages by weight unless otherwise specified.

Acrylic fibers were obtained by a solution batch polymerization method using abisobutyronitrile as a catalyst and dimethylformamide as a solvent in a conventional manner to obtain an acrylic polymer having the heptad composition shown in Table 1. The amount of methyl acrylate in the comparative example was determined using an infrared spectrometer. The amount of vinyl sulfonate metal salt was determined by chemical neutralization titration method, and the remaining amount was taken as the amount of acrinitrile.

The obtained acrylic polymer was made into a 15% dimethylformamide solution, and then stretched, washed with water, dried, and oiled using a conventional wet spinning method using a dimethylformamide/water coagulation bath to form filaments of 200 denier and 70 filaments. I got it. Next, a tubular knitted fabric was obtained using a circular knitting machine and used as an electroless plating sample.

Pretreatment for electroless plating was carried out by immersion in a caustic soda water pH 12 aqueous solution for 3 minutes at 80° C. after treatment with acidic palladium in hydrochloric acid.

The gold plating solution is a conventional gold chloride 0.5% aqueous solution and pH
12 (caustic soda, formaldehy)" 0.5% aqueous solution was used. Also, as the silver plating solution, a conventional 5% silver nitrate solution was used.
, caustic soda aqueous solution pH 12 and glucose 5%, citric #
, a 1% aqueous solution was used, but the treatment is not particularly limited to this.

Table 2 shows the electrical resistance and gloss of the electroless plated polyacrylic circular knitted fabric obtained. The electrical resistance of the knitted fabric was measured using a resistance needle. The amount of electroless plating was measured by a weighing method.

Despite copolymerizing a small amount of comonomer other than the sulfonic acid metal salt vinyl monomer, the electrical resistance value was high and the metallic color tone was dark. In order to obtain good results, the amount of metal plating must be increased, and since precious metals are used in practice, this method is extremely disadvantageous in terms of cost.
Margin below Table 1 Margin below

Claims (2)

[Claims] (1) A metal-plated acrylic fiber, which is characterized in that an acrylic fiber made of acrylonitrile and a vinyl sulfonate monomer is plated with copper and/or nickel by electroless plating and then plated with gold or silver. (2) The polyacrylic fiber according to claim 1, wherein the acrylic fiber is made of at least 95% by weight of acrylonitrile.