JPS6297970A - 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 Industrial Application The present invention relates to a method for manufacturing conductive yarn. For more details,
Conventional technology relates to a method for industrially stably manufacturing yarn with high and uniform conductivity.In recent years, with the development and spread of the electronics industry, demand for 4-character materials has increased. In response to this, various new products have been proposed. Among them, conductive fibers have been proposed in which sulfide steel is attached to acrylic fibers, polyamide fibers, polyester fibers, or natural animal or vegetable fibers containing cyan groups ( Japanese Unexamined Patent Publication No. 56-12
No. 8311, No. 56-169808 and No. 57
-21570 Publication). These fibers can be produced, for example, by treating the fiber threads in a solution containing copper salts and reducing sulfur compounds, or by contacting them with reducing sulfur compounds such as hydrogen sulfide under pressure and then removing copper ions. By α-coating with a liquid containing , conductive material 111 made of copper sulfide is formed on the surface of the fiber, thereby making it possible to obtain a fiber having electrical conductivity.

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 in which a yarn or a spun yarn is subjected to a copper sulfide forming treatment in the form of a cheese, and a method in which a filament yarn is entirely wound around a spun yarn and the entire spun yarn is subjected to a copper sulfide forming treatment. However, with these methods, it is difficult to uniformly apply copper sulfide formation treatment to fibers or yarns, the resulting yarns have low uniformity of conductivity, and the yarns may become entangled or There are problems in that the stability of processing the yarn is still unsatisfactory due to breakage, and the disadvantage is that it is not suitable for mass production.

In order to overcome these drawbacks, a method is employed in which fiber yarns are made into a knitted fabric, this knitted fabric is rolled up into a whole, the inner part is stretched so as not to be disturbed, and the whole is subjected to a copper sulfide forming treatment. However, in such cases, there is a drawback that the spread part KVi sulfide is not adhered and the conductivity is uneven, and copper sulfide is formed in the knitted state. When treated, there is a drawback that copper sulfide adhesion is low in the intertwined parts, conductivity and properties are uneven, and scratches such as twitching occur. The reality is that fiber threads with high conductivity have not been obtained.

Problems to be Solved by the Invention The present inventors have developed a conductive yarn in which a conductive layer containing copper sulfide is uniformly formed, the resulting product has high and uniform conductivity, and has excellent workability. As a result of extensive research into methods for industrially producing , the present invention has been completed.

The means for solving the problem, that is, the non-invention, is to produce a knitted fabric from fiber yarn, charge the knitted fabric into a water-permeable bag, and perform a copper sulfide forming treatment. This is a method for producing conductive yarn, which is characterized by disassembling a knitted fabric containing sulfurized steel.

There is no particular limitation on the type of fiber yarn used in the method of the present invention, but for example, polyamide D1. fibers (including aromatic polyamide fibers), polyester fibers, polyacrylic fibers, polyolefin fibers, polyurethane fibers,
Polyester ether fiber, polyvinyl alcohol fiber, polyvinyl chloride fiber, polyvinylidene chloride fiber, rayon fiber, cupra fiber, cellulose acetate fiber,
Preferably, the fiber is made of at least one type of fiber selected from animal fibers, vegetable fibers, and the like. These fiber yarns are used in the form of spun yarn, monofilament type, or multifilament type, and may be mixed fiber yarn or composite yarn.

There is no particular limitation 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 more preferred.

There are no particular restrictions on the knitting method or knitting structure of the m-change fabric in the method of the present invention, and any known knitting method or 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 jersey knitting, which has good yarn disassembly properties. There is no particular limit to the density of the fabric, but if it is too coarse, the threads are likely to break during the knitting process, which may reduce productivity. Furthermore, if the density of the knitted fabric is moderately high, the copper sulfide conductive layer formed on the fiber surface tends to adhere unevenly, making it impossible to obtain uniform conductivity. 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 a knitted fabric is knitted from fiber yarns of 0 to 100 deniers, the elongated density is 10 to 100 loops/2.
It is preferable to set the density to 5.4 m. More specifically, for example, for a yarn with a thickness of about 30 denier, a hook diameter of 33/4 to 31/2 inches will yield 200 to 400 denier.
It is preferable to use a knitting machine with regular needles so that the elongation density is within the range of 20 to 80 loops/inch.

The water-permeable bag-like material used in the method of the present invention is a cylinder with a diameter of 5 m, filled with 300 W of water, a sample applied to it, and the cylinder turned upside down, allowing 300 W of water to drain through the sample. The water permeability is expressed by the time required (seconds), and the water permeability is 0.05 cc/α2/sec or more, preferably 0.1 cc 7 cm"7 se
c or more. Water permeability is 0.05 c c//cW11
/sec or less, the conductive agent cannot be uniformly adhered to the knitted fabric in the bag-like article.

There is no particular limitation on the type of fiber used for the bag-like article, and any fiber may be used, and the fiber threads used are as follows:
It is used in the form of spun yarn, monofilament, multifilament, or false twisted yarn, and may be a mixed yarn or composite yarn, and there are no particular limitations on its thickness, but it is generally 20 d. The above are preferred.

Further, the bag-like material may be made of woven fabric, knitted fabric, or non-woven fabric, and its shape is not particularly limited, and its size varies depending on the copper sulfide forming treatment conditions and may be set arbitrarily.

The purple color of charging the rewoven fabric into the bag-like material depends on the copper sulfide formation treatment conditions,
It differs depending on the processing machine, and the filling rate may be set arbitrarily for each machine.

Furthermore, the bag-like material may be processed to improve permeability.

There is no particular limitation on the method of depositing the conductive agent on the knitted fabric in the bag-like article in the method of the present invention. For example, JP-A-57-
In accordance with the method described in Publication No. 35078, a knitted fabric made of synthetic polymer fibers is brought into contact with a reducing sulfur compound such as hydrogen sulfide under pressure, and then treated with an aqueous solution of a copper salt. A method in which a reducing agent is applied simultaneously with or subsequent to this treatment can be used. Alternatively, in accordance with the method described in JP-A No. 56-128311, a compound capable of releasing sulfur atoms and/or sulfur ions after adsorbing -valent steel ions to the knitting fabric is used. A method of processing may also be used. Alternatively, a divalent copper ion, a reducing agent capable of reducing the divalent copper ion to a monovalent one, and a sulfur atom and/or a sulfur ion are released according to the method described in JP-A No. 57-21570. It can be used in a method of treating knitted fabric using a treatment liquid containing a compound that can be used.

Copper salts used in the above method include divalent copper salts such as cupric chloride, sulfur* steel, steel nitrate, cupric acetate, copper oxalate, cuprous chloride, cuprous iodide, etc. , cuprous cyanide, cuprous thiocyanate, and other copper salts.

In addition, as reducing sulfur compounds, sulfoxylates,
Nithionates, thiosulfates, medium sulfates, bisulfites, pyrosulfites, thioureas, and the like can be used.

Further, as reducing agents capable of reducing divalent copper ions to monovalent copper ions, metal steel, hydroxylamine sulfate, ferrous sulfate, ammonium nononadate, furfural, sodium hypophosphite, glucose, etc. are used. can be mentioned.

Furthermore, compounds that can release both or either one of sulfur atoms and sulfur ions include sodium sulfide, sulfite, dithionite, sodium dithionite,
Examples include sodium thiosulfate, acidic sodium sulfite, sodium pyrosulfite, sulfur disulfide, thiourea dioxide, hydrogen sulfide, Rongalid C, Rongalit 2, and the like.

Among the treatment methods described above in which a conductive agent containing sulfurized steel 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 an aqueous solution containing a copper salt and a reducing sulfur compound, the treatment conditions are as follows: Usually 20-150℃, preferably 30-100℃
℃ temperature for 10 minutes to 10 hours and a bath ratio of 1:10 to 200 is adopted. When heat treatment is used in conjunction with this deposition process,
The temperature of the treatment bath is preferably 0.5-b, and the pH of the treatment bath is usually 1.5-6. and a pH adjuster consisting of at least one selected from salts such as disodium hydrogen phosphate, sodium citrate, and sodium acetate. Also,
Compounds containing nitrile groups, with the purpose of promoting the formation of sulfided steel
Alternatively, it is also effective to pre-treat or add a mercapto group-containing compound to the treatment bath.

In the method of the present invention, the characteristics of the copper sulfide conductive layer contained in the sulfide steel-containing knitted fabric obtained in the conductive layer forming treatment step are determined by the conductivity required for the intended conductive yarn, the purpose of the yarn, and the characteristics of the yarn. An arbitrary VC can be set taking into account the type, thickness, etc., but it is generally preferable that it is within the range of 0.5 to 10% by weight.

For knitted fabrics containing sulfurized steel, an appropriate amount of A is added before the knitting process.
The disassembly property can also be improved by impregnating and adhering a rough-in type smoothing oil agent and/or a silicone type smoothing oil agent.

In addition, in order to impart high resistance and durability against physical friction, abrasion, rubbing, etc. to the conductive yarn obtained in the unraveling process, running during or after the washing and unraveling process is performed. The yarn is coated with an abrasion resistance imparting agent, such as a film-forming resin such as a polyester, polyamide, or polyacrylic acid polymer, and which becomes water-insoluble after drying. Preferably, it may be applied in the range of 3 to 40 weights.

In the method of the present invention, since the conductive agent containing sulfide steel is applied to the knitted fabric charged in the bag-like material,
A continuous conductive layer is uniformly formed on the surface of the cell fibers constituting the knitted fabric, and the conductivity of the resulting conductive yarn is also uniform.

Moreover, in the method of the present invention, the unraveling process of the sulfurized steel-containing fabric is carried out smoothly, and the process of processing the obtained conductive yarn, such as winding, unwinding, gold thread, twisting, weaving, knitting, etc. is easily implemented.

Example Hereinafter, the present invention will be specifically explained using examples.

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

Example 1 A raw yarn of nylon 66 filament yarn, 20d/3f (trade name: Leona, manufactured by Asahi Kasei Industries, Ltd.) was used with 300 needles, 3
Knitting is carried out using a one-piece knitting machine with a pot diameter of 1/2 inch,
A knitted fabric with an elongated density of 50 loops/25.4M was produced. Each of the knitted fabrics IKq was placed in the water permeable bags shown in Table 1, and five bags were made for each water permeability level. Next, 5 bags of each water permeability level (5 to 9 weights of knitted fabric) were put into a Nomidor dyeing machine (Yong @ Zooox), and after processing, 2g/2 score roll FC-250 (
(manufactured by Kako Atlas Co., Ltd.) was added thereto, and N kneading was performed at 60° C. for 20 minutes.

After scouring, sulfuric acid f@1oz/L sodium thiosulfate IJum 1
0g/l, sodium acetate9. og/j! , acetic acid x, s
g, /fi, 2-mercaptobenzimidazole 0.2
A treatment liquid 1802 containing % owf was charged into a paddle dyeing machine. - ξ dollar dyeing machine The temperature of the treatment liquid was raised from room temperature to 45°C over 15 minutes while stirring by rotating the stirring blade, and further treated at 45°C for 100 minutes. After treatment, it was dehydrated, washed with water, dehydrated, and then dried. After drying, the knitted fabric was taken out from each bag and the uniform adhesion of the sulfurized steel was determined.

The results are shown in Table 1. In addition, the amount of copper sulfide deposited, the surface electrical resistance of the knitted fabric, the scratches on the knitted fabric, and the electrical resistance of the yarn obtained by disassembling the shaft fabric at 200 m/min were measured. The results are shown in Table 1.

For comparison, scouring and copper sulfide processing were also carried out in the same manner as above for cases in which the knitted fabric was not placed in a bag-like product or in a case in which it was placed in a bag-like product outside the scope of the invention.

The uniform adhesion of copper sulfide on the resulting knitted fabric was determined.

The results are shown in Table 1. Furthermore, the amount of copper sulfide deposited, the surface electrical resistance of the knitted fabric, the scratches on the knitted fabric, and the electrical resistance of the yarn after the knitted fabric was disassembled were measured. The results are shown in Table 1.

From the results shown in Table 1, the copper sulfide-containing knitted fabric produced by the method of the present invention has high conductivity, uniform conductivity, and highly uniform conductive yarns, and is industrially suitable. There are products with high product value.

Example 2 Polyester filament yarn, raw yarn of 75d/36f, was knitted using a machine with 300 needles and a hook diameter of 31/2 inches, and the final density was 40 loops/ 25.
A 4m+ knitted fabric was produced. Seven pieces of each of these knitted fabrics IK were placed in the water permeable bags shown in Table 2, and bags were made for each water permeability level. Next, oh! Into the Niemeyer dyeing machine (capacity 20 Qfi), put 10 bags of each water permeability level (-10 Kq as replacement weight), add 2 g/2 score roll FC-250 (
(manufactured by Kako Atlas Co., Ltd.) was added thereto, and scouring was performed at 70°C for 20 minutes. After 1rIl kneading, sulfuric acid fi 10 g/E, f,
taP Nat! Treatment liquid 190 containing 1 og/It of J-A, 9.0 g/Q of sodium acetate, 1.5 g/Q of acetic acid, and 0.3% OWF of 2-mercazotobenzimidazole
g was loaded into an Ohr A-Meyer dyeing machine. Next, the temperature of the treatment liquid was raised from room temperature to 50°C over 15 minutes, and further treated at 50°C for 70 minutes. After treatment, it was dehydrated, washed with water, dehydrated, and then dried. After drying, the @kaeji was taken out from each bag and the uniformity of adhesion of the sulfurized steel was determined. The results are shown in Table 2. Also, the amount of adhesion of sulfide steel, - surface electrical resistance of replacement ground,
The scratches on the knitted fabric and the lightning resistance of the yarn, which was knitted at 200 m/min, were measured. The results are shown in Table 2.

For comparison, scouring and copper sulfide processing were carried out in the same manner as in Section E, even when the knitted fabric was not charged into a bag-like article and when it was charged into a bag-like article using a method other than the method of the present invention. The uniformity of the iron-coated steel deposits on the obtained knitted fabric was determined. The results are shown in Table 2. In addition, the copper sulfide adhesion number, the surface electrical resistance of the slightly changed ground,
The scratches on the long-changed fabric and the electrical resistance of the yarn after the knitted fabric was disassembled were traced and determined. The results are shown in Table 2.

From the results in Table 2, it is clear that the copper sulfide-containing knitted fabric produced using the uninvented method has high conductivity, uniform conductivity, and highly uniform conductive yarns, making it suitable for industrial use. Also product price;
It is highly direct.

(Above 45, white) Effects of the Invention According to the method of the present invention, a uniform 4500-4000 with high conductive performance and uniform
This is due to the efficient production of conductive yarns that have electrical properties and excellent workability.

Claims (1)

[Claims] The method is characterized in that a knitted fabric is produced from fiber yarns, the knitted fabric is charged into a water-permeable bag-like material, a copper sulfide forming treatment is performed, and the obtained copper sulfide-containing knitted fabric is disassembled. Manufacturing method of conductive yarn