JPS6297969A - Production of conductive yarn - 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 Field of the Invention The present invention relates to a method for manufacturing conductive yarn. More specifically, the present invention relates to a method for industrially stably producing a durable and uniformly conductive yarn.

BACKGROUND OF THE INVENTION In recent years, with the development and spread of the electronics industry, the demand for conductive materials has increased, and unique new products have been proposed to meet this demand. Among them, acrylic fibers, polyamide fibers, polyester fibers, or natural fibers,
Conductive fibers have been proposed in which sulfide steel is attached to vegetable fibers containing cyan groups (Japanese Unexamined Patent Application Publication No. 1983-1999).
-128311 publication, 56-769808 publication,
Publication No. 57-21570). These conductive i&fibers are produced, for example, by treating the fiber threads in a solution containing copper salts and reducing sulfur compounds, or by contacting them under pressure with reducing sulfur compounds such as hydrogen sulfide and then removing copper ions. It is stated that a conductive layer made of copper sulfide is formed on the surface of the fibers by treatment with a liquid containing the fibers, thereby making it possible to obtain a conductive cloth.

Methods for producing these conductive fiber yarns containing copper sulfide include a method in which short fibers (staples) are subjected to copper sulfide forming treatment and the resulting staple fibers having a conductive layer are made into yarn, There is a method of applying copper sulfide forming treatment to yarn or spun yarn in the form of cheese, or a method of winding filament yarn or spun yarn into a whole and applying copper sulfide forming treatment to this whole. . However, these methods
It is difficult to uniformly apply copper sulfide formation treatment to fibers or threads, and the resulting threads have low uniformity of conductivity.
Furthermore, the method has the disadvantage that it is not suitable for mass production because the threads may become tangled or break, and there is still no satisfactory method in terms of processing stability for the threads.

In order to overcome these drawbacks, there is a method of manufacturing fiber yarn into a knitted fabric and subjecting this knitted fabric to a copper sulfide forming treatment. When knitting, copper sulfide easily falls off due to physical friction such as guide rubbing, resulting in poor conductivity uniformity and lower conductivity level.Furthermore, yarn breakage occurs frequently during knitting. The reality is that fiber threads that have a highly processable conductive layer with a durable conductive layer and high uniformity have not been obtained.

Problems that the invention aims to solve: 1. The conductive layer containing copper chloride is uniformly formed, the conductive layer is durable, the resulting product has uniform conductivity, and the conductive yarn has excellent workability. As a result of extensive research into a method that can be manufactured with high productivity, the present invention has been completed.

Means for solving the problem, that is, the present invention is to create a knitted fabric by fully twisting the fiber yarns,
After this knitted fabric VC copper sulfide forming treatment is exhausted, a conductive layer containing copper sulfide is formed on the surface of the fibers constituting the knitted fabric, and the obtained copper sulfide-containing knitted fabric is disassembled. This is a method for manufacturing a conductive yarn, which is characterized by the following.

The type of fiber yarn used in the method of the present invention is not particularly limited, but examples include polyamide fibers (including aromatic polyamide fibers), polyester fibers, polyacrylic fibers, polyolefin fibers, and polyurethane fibers. Consists of at least one type of fiber selected from fibers, polyester ether fibers, polyvinyl alcohol fibers, polyvinyl chloride fibers, polyvinylidene chloride fibers, rayon fibers, cupro fibers, cellulose acetate fibers, animal fibers, vegetable fibers, etc. Preferably. These fiber yarns are used in the form of spun yarns, monofilament yarns, multifilament yarns, and may be mixed yarns or composite yarns.

There are no particular limitations on the thickness of the fiber yarn used in the method of the present invention, but in general, a thickness of 10 to 100 deniers is preferred, and a thickness of 10 to 75 deniers is particularly preferred.

The twisting speed in method 75 of the present invention is preferably 50 to 500 T/m. If it is less than s o T/m, copper sulfide will fall off during knitting, there will be no durability, and yarn breakage will occur frequently.

On the other hand, if it is 5ooT/m or more, the sulfurized particles will not adhere uniformly, the conductivity will be non-uniform, and f piling will occur during disassembly.

There are no particular restrictions on the knitting method or knitting structure of the knitted fabric in the method of the present invention, and any known knitting method and structure such as jersey knitting, rubber knitting, double-sided knitting, Milano rib knitting, etc. can be employed. However, in the method of the present invention, it is preferable to employ all jersey stitches, which have good yarn disassembly properties. There is no particular limit to the density of the knitted fabric, but if it is too coarse (the knitted fabric tends to twitch during the copper chloride forming process, and
In the knitting process, the yarn may break easily and productivity may decrease. In addition, when the density of the knitted fabric is moderately high, spots of adhesion of the copper sulfide conductive layer formed on the fiber surface are likely to occur.
Therefore, uniform conductivity may not be obtained.

The preferred density of the knitted fabric varies depending on the denier of the yarn used and the type of knitted fabric, but for example, as mentioned above, when the knitted fabric is knitted from fiber yarns of 10 to 100 denier, the density at the end of elongation is It is preferable to have a high density of 10 to 100 loops/25.4y. More specifically,
For example, for a yarn with a thickness of about 30 denier, 33/4~
It is preferable to use a knitting machine FTK with a pot diameter of 31/2 inches and 400 to 200 knitting needles, and the elongated density is in the range of 20 to 80 loops/inch.

There is no particular limitation on the method for depositing a conductive agent containing copper sulfide on a knitted fabric. For example, the method described in Japanese Patent Application Laid-Open No. 57-35078 can be used to deposit fiber yarn made of a synthetic polymer. Using a method in which the knitted fabric of the strips is brought into contact with a reducing sulfur compound such as hydrogen sulfide under pressure, then treated with an aqueous solution of copper salt, and a reducing agent is applied simultaneously with or following this treatment. I can do it. Alternatively, according to the method described in JP-A-56-128311, 111I! A method may be used in which copper ions are adsorbed onto the knitted fabric and then treated with a compound capable of releasing sulfur atoms and/or sulfur ions.

Alternatively, according to the method described in JP-A No. 57-21570, divalent copper ions, a reducing agent capable of reducing the divalent copper ions to monovalent ones, and sulfur atoms and/or sulfur ions are combined. It can be used in a method of treating knitted fabrics using a treatment liquid containing a compound that can be released.

Copper salts used in the above method include divalent copper salts such as cupric chloride, copper sulfate, copper nitrate, cupric acetate, and copper oxalate; cuprous chloride, cuprous iodide, and cyanide. There are copper salts such as cuprous oxide and cuprous thiocyanate.0 In addition, reducing sulfur compounds include sulfoxylates,
Nithionite, thiosulfate, sulfite, bisulfite, pyrosulfite, thiourea, etc. can be used.

Further, examples of reducing agents capable of reducing divalent copper ions to monovalent copper ions include metallic copper, hydroxylamine sulfate, ferrous sulfate, ammonium vanadate, furfural, sodium hypophosphite, and glucose. can.

Furthermore, compounds capable of releasing both or either a sulfur atom and a sulfur ion include sodium sulfide, sulfurous acid, dithionite, sodium dithionite,
Sodium thioC1 choate, sodium acid sulfite, sodium pyrosulfite, two; sulfur, thiourea dioxide,
Examples include hydrogen sulfide, Rongalit C10 Rongalit 2, and the like.

Among the treatment methods described above in which a four-electrode agent containing copper sulfide is deposited on a knitted fabric, for example, in the case of a method in which the knitted fabric is treated in one bath with a water bath solution containing a copper salt and a reducing sulfur compound, the treatment Conditions are usually 20-150℃, preferably 30-100℃
The temperature is 10 minutes to 10 hours, and the bath ratio is 1:1O to 200W. When heat treatment is used in combination with this deposition treatment, it is preferable that the treatment bath has a gradation of 0.5 to b. The pH of the treatment bath is usually 1.5 to 6, and if necessary, inorganic acids such as sulfuric acid, hydrochloric acid, phosphoric acid, citric acid,
Acids such as acetic acid, and disodium hydrogen phosphate,
A pH adjuster consisting of at least one selected from salts such as sodium citrate and sodium acetate is used. It is also effective to pre-treat the object to be treated with a nitrile group-containing compound and/or a mercapto group-containing compound, or to add them simultaneously to the copper sulfide treatment bath for the purpose of promoting the formation of copper sulfide.

During the wet treatment to form copper sulfide, the knitted fabric to be treated may be placed in a coarse net bag and subjected to the treatment in order to prevent the knitted fabric from becoming taut and causing defects such as eye distortion. preferable.

In the method of the present invention, the amount of copper sulfide conductive layer contained in the copper sulfide-containing knitted fabric obtained in the conductive layer forming treatment step is determined by the conductivity required for the intended conductive yarn, the intended use, and the type of yarn. Although it can be set arbitrarily taking into consideration all factors such as thickness, thickness, etc., it is generally preferable to set it within the range of 0.5 to 10% by weight.

It is also possible to impregnate and adhere an appropriate amount of a paraffin smoothing oil agent and/or a silicone smoothing oil agent to a copper sulfide-containing knitted fabric before the unraveling process to improve its unravelability.

In addition, in order to impart high resistance and durability against physical friction, abrasion, rubbing, etc. to the conductive yarn obtained by the disassembly process, during or after the disassembly process, Abrasion resistance imparting agents such as polyester, polyamide, or polyacrylic acid polymers, which have film-forming properties and become water-insoluble after drying, are applied to the running threads. It may be applied preferably with a gong of 3 to +oM.

In the method of the present invention, the d7 Q agent containing copper cIL is applied to the knitted fabric in which the fiber threads are twisted, so that a continuous conductive layer is uniformly formed on the surface of the fibers constituting the knitted fabric. is formed, and this conductive layer is durable,
The conductivity of the conductive thread is also uniform. Moreover, in the method of the present invention, the unraveling process of the copper sulfide-containing knitted fabric is carried out smoothly,
Furthermore, processing of the obtained conductive yarn, such as winding, unwinding, gold thread, twisting, fiber making, and knitting, can be easily carried out.

Example Hereinafter, the present invention will be specifically explained with reference to Examples.

However, the present invention is not limited to these examples.

Example 1 Nylon 66 filament yarn, 30d/10f (trade name Leona, manufactured by Asahi Kasei Corporation) raw yarn, 50T/m,
2 o o T0n, s o T0n, were twisted respectively. The number of needles for each raw yarn obtained was 300,
31/! It was knitted using a one-piece knitting machine having a kettle diameter of 1 inch to produce a knitted fabric with a stretched density of 50 loops/25.4 iu. For each knitted fabric, make l Kf into general shapes,
Packed into polypropylene fiber net bags and passed through paddle dyeing machine (
Five bags of each knitted fabric (weight of knitted fabric: 59) were placed in a volume zoot), 21/l score roll FC-250 (manufactured by Kako Atlas Co., Ltd.) was added to the treatment solution, and the mixture was heated at 60°C. We practiced Yuren for 20 minutes.

After scouring, copper sulfate 12.5 f/l, thio(;f acid)
IJum 12-5r/l, b Sodium acetate9. oy/
A treatment solution containing 180 t' Sowf, acetic acid 1.5 V/l, and Z-mercaptobenzimidazole 0.1' Sowf was charged into a paddle dyeing machine. While rotating the paddle dyeing machine stirring blade and stirring, adjust the temperature of the treatment solution from room temperature to 45℃.
The temperature was raised over 5 minutes, and the mixture was further treated at 45° C. for 90 minutes.

After treatment, it was dehydrated, washed with water, dehydrated, and dried.

After drying, copper sulfide was uniformly adhered to each copper sulfide-containing knitted fabric in the weight percent shown in Table 1. The total number of yarn breakages during disassembly of the electrical resistance of the strips was measured. The results are shown in Table 1.

Also, for comparison, the twisted yarn is 15T/7F! The raw yarn thus obtained was also knitted, refined, and processed with copper sulfide in the same manner as above. The obtained copper sulfide-containing knitted fabric was uniformly adhered with the copper sulfide of the 'M shavings shown in Table 1. A similar 6111 determination was made for the number of yarn breaks during knitting.

The results are shown in Table 1.

From the results of the 1st test, it was found that the thin material containing 1C steel carried out in the present invention has uniform adhesion of IjJ:C copper, durability of the conductive layer with decomposition π, and highly uniform conductivity. has
It can be seen that a printed fiber yarn with excellent knitting processability and high commercial value can be obtained.

Margin Example 2 Acrylic long fiber yarn 50d/25f (trade name: Beaulon, manufactured by Asahi Kasei Industries, Ltd.) 6 s o T0n, so
o Each of the raw yarns obtained by twisting to T0n and 7'no was knitted using a one-piece knitting machine in the same manner as in Example 1 to produce a knitted fabric with a stretched density of 40 loops/25.4txx. Each of these floods (5002 pieces for each of the 6 properties) were packed into polypropylene ring net bags, and a rotary dyeing machine (manufactured by Tokyo Washiki Co., Ltd.) was used.
5 bags (2.5Kf as the weight of Beuron knitted fabric)
was added, and 201/l of copper sulfate, 20 y/l of sodium thiosulfate, and 20 flt of sodium bisulfite were added to the water to adjust the total amount to a Zoo t treatment solution.

The temperature of this treatment solution was raised from room temperature to 70°C over 30 minutes, and further treated at 70°C for 30 minutes.

After the treatment, it was dehydrated, washed with water, dehydrated, and then dried. After drying, each copper sulfide-containing knitted fabric has copper sulfide uniformly adhered to it as shown in Table 2. Ia of the yarn
+ Air resistance The number of yarn breaks during resistance knitting was measured. The results are shown in Table 2.

For comparison, raw yarn that had been twisted using IOT was also knitted in the same manner as above and subjected to copper sulfide processing.

The obtained copper sulfide-containing knitted fabric was uniformly coated with copper sulfide in the weight percent shown in Table 2, and the surface electrical resistance of this knitted fabric, the electrical resistance of the yarn after knitting the knitted fabric, and the The number of thread breaks during knitting was measured.

The results are shown in Table 2.

From the results in Table 2, the copper sulfide-containing knitted fabric implemented in the present invention has copper sulfide that adheres uniformly, the conductive layer has durability when unraveling, and has highly uniform conductivity. It can be seen that a fiber yarn with high commercial value can be obtained.

Table 2 Effects of the Invention According to the method of the present invention, it is possible to efficiently produce four-electric strips having durable conductivity, uniform conductivity, and excellent workability.

In addition, the fc24' yarn produced by the method of the present invention can be used in special work fields for clothing that requires antistatic and antistatic properties, and if kept, it can be used for electrical training carpets and antistatic clothing. , antistatic gloves, etc.

Patent issued on ratification Asahi Kasei Kogyo Co., Ltd. Procedural amendment (voluntary) June 7, 1985 Michibu Uga, Commissioner of the Patent Office■, Indication of the case 1985 Patent Application No. 233381 2, Name of the invention Conductive thread Manufacturing method 3, relationship with the case of the person making the amendment: Patent applicant 1-2-6-5 Dojimahama, Kita-ku, Osaka-shi, Osaka Prefecture, Specification of contents of amendment, page 6, line 15 r-----1 preferable. Insert the following sentence after ``.

"After the knitted fabric is knitted, it can be subjected to heat setting treatment such as dry heat or steam to reduce wrinkles caused by copper sulfide forming treatment after setting."

Claims (1)

[Claims] A knitted fabric is obtained by twisting fiber threads, and a copper sulfide forming treatment is applied to this knitted fabric to form a conductive layer containing copper sulfide on the surface of the fibers constituting the knitted fabric. A method for producing a conductive yarn, characterized by disassembling a copper sulfide-containing knitted fabric.