JPS63211366A - Production of conductive composite fiber - 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 Technical Field The present invention relates to a conductive composite 41 miscellaneous. More specifically, a method is provided for producing a conductive composite fiber consisting of a core component containing conductive powder and a sheath component made of 141i cloth-forming polyester, in which a portion of the core component is exposed on the surface. It is something to do.

<Prior Art> Conductive fibers are used for antistatic purposes in clothing, carpets, etc., and for various other purposes. Furthermore, recently, high-performance conductive fibers have been required in industries that dislike static electricity, such as the semiconductor industry. Conductive fibers are usually conductive powders, such as carbon black or tin oxide.

Manufactured in 1988 by mixing titanium oxide coated with tin oxide.

However, these materials are colored with varying degrees of color, and efforts are being made to increase the degree of whiteness as much as possible. For example, there is a method in which a thread has a core-sheath type structure and a white resin is arranged in the sheath.

On the other hand, in order to take full advantage of the characteristics of conductive fibers, it is desirable that the conductive portion be exposed on the fiber surface, and this exposed portion may be small. Combining these factors, it becomes possible to create a fiber by putting a composition containing conductive powder into the core, with only a small portion of it exposed to the surface of the fiber.

However, it is difficult to expose only a part of the core, and even if a method of creating an eccentric core-sheath structure is used, such as adding a polymer flow in the core to a position offset from the center of the sheath, it is difficult to expose only a part of the core. It is very difficult to control whether a large amount of the core is exposed or not exposed on the surface.

Therefore, there is a method in which a part of the core component is exposed on the fiber surface by making an eccentric core-sheath type composite fiber and subjecting it to an alkali weight reduction process, and a method in which a pore-forming agent is contained in the sheath component of a concentric type composite fiber. A method has been proposed in which pores reaching the core component are formed by subjecting this to an alkali weight reduction process (Japanese Patent Application No. 59-220477).

According to such a proposal, it becomes possible to easily expose only the -P11 vermilion of the core, but in the former case, Ifil
Compared to the circular core type, the eccentric type inevitably has variations in eccentricity, and this variation results in variations in the degree of exposure of the core after alkali reduction processing, that is, variations in conductive performance. It is necessary to include a pore-forming agent in the components, and troubles in the spinning and stretching processes tend to increase depending on the dispersion state of the pore-forming agent, so improvements still need to be made in practical use.

The inventors of the present invention have made repeated efforts to eliminate such difficulties and to find a method for manufacturing core-sheath type composite #A navy blue with a small amount of exposed conductive portion with good reproducibility, and as a result, they have developed a method for treating polyester fibers with an amine compound. We focused on the fact that while alkali weight loss treatment removes relatively uniformly from the yarn surface in the radial direction, rather deep crack-like grooves are generated in some areas, we applied amine treatment to core-sheath type composite fibers. We found that as a result of applying this method, cracks were formed that led from the fiber surface to the core component.
We have arrived at the present invention.

<Structure of the Invention> That is, the present invention uses a core-sheath type composite fiber having a conductive component made of conductive powder and a thermoplastic polymer as a core component and a fiber-forming aromatic polyester as a sheath component, which is treated with an amine compound. This is a method for producing conductive composite fibers, which is characterized by forming cracks in the sheath component that extend from the surface to the core component.

The polyester used for the sheath component in the present invention is a π-forming polyester containing an aromatic dicarboxylic acid as the main acid component and an aliphatic glycol as the main glycol component, and has a fiber ratio of π-forming within a range that does not impair the fiber-forming ability. It may also be a polyester obtained by copolymerizing the components. The aromatic dicarboxylic acids mentioned here include terephthalic acid, isophthalic acid,
It is a compound in which naphthalene dicarboxylic acid and diphenyl dicarboxylic phenyl ether dicarboxylic acid are directly bonded, and prephthalic acid is particularly preferred. Furthermore, aliphatic glycol refers to ethylene glycol, trimethylene glycol, tetramethylene glycol, hexamethylene glycol, neopentyl glycol, etc. Among these, ethylene glycol, tetramethylene glycol, and hexamethylene glycol are particularly preferably used. .

In the present invention, the third component to be copolymerized includes aromatic dicarboxylic acids other than the main constituent components of the polyester, aliphatic dicarboxylic acids such as oxalic acid, malonic acid, succinic acid, adipic acid, sebacic acid, and decanedicarboxylic acid; Alicyclic dicarboxylic acids such as hexahydroterephthalic acid, decalindicarboxylic acid, tetralindicarboxylic acid, glycolic acid,
Aliphatic diols other than the main constituents of polyesters, such as p-oxybenzoic acid, ethylene glycol, trimedylene glycol, propylene glycol, 1,3-butanediol, neopentyl glycol, polyethylene glycol, and cyclohexane dimethylol.

Alicyclic hX diols such as tricyclodecane dimethylol,
Examples include aromatic diols such as bisphenol A, bisphenol S, bishydroxyethoxybisphenol A, and tetrabromo-sphenol A.

Conductive powders include single powders such as carbon and metals.

Metal oxide powder such as carbon dioxide J, zinc oxide, ME copper oxide.

Iodide steel, metal compound particles such as zinc sulfide, and particles coated with titanium oxide or other particles are used.

Thermoplastic polymers to which the conductive powder is blended include polyethylene, polypropylene, polystyrene, polybutadiene, polyisoprene, nylon-6, nylon-6,
6. Polyethylene terephthalate, polybutylene terephthalate, etc. are mainly used, but some of these may be replaced with copolymer components, and if it is a thermoplastic polymer, polymers other than the above may be used depending on the purpose. It may also be a mixture of two or more of them, if necessary.

In addition, since such a polymer needs to contain conductive powder, it is preferable that the melt viscosity is relatively low, and the melt viscosity is preferably 200 to 0,000 depending on the molding conditions after mixing the conductive powder. is preferred.

The mixed matrix of conductive powder varies depending on the type of conductive powder, and it is difficult to define it unambiguously, but in general, resin 1
100 to 300 parts by weight per 00 parts by weight. It is preferably 150 to 300 parts by weight, and as much as possible is preferable in terms of performance. However, when 300 parts by weight or more are mixed, not only is it not possible to mix sufficiently, but the fluidity is also poor, which is not favorable for operation.

The conductive powder may be surface-treated to improve its affinity with the polymer, or a long-chain fatty acid may be added to the polymer, or a plasticizer may be added thereto.

The conductive powder and polymer are sufficiently kneaded to form a core component. This kneading may be performed in a molten state, or may be kneaded using a solvent and then dried.

In the present invention, a composite #AtIL is prepared in which a core component is a polymer containing such conductive powder and a thermoplastic aromatic polyester is a sheath component. I of this composite fiber
Any method can be adopted as the IA manufacturing method.

The composite ratio of the conductive core component and the non-conductive component sheath is arbitrary, but generally conductive components mixed with a large amount of conductive powder tend to be inferior in strength, elongation, etc. 60%
In particular, about 5 to 50% is often preferred.

The cross-sectional shape of the conductive component core is arbitrary, and any shape is possible. Further, the number of cores can be selected from one or more.

Furthermore, in the present invention, $1i obtained by the above method
It is necessary to treat the cloth with an aqueous amine solution to form a crank that runs from the fiber surface to the conductive core. As the type of amine compound, alkyl amines such as methylamine, ethylamine, and propylamine, and primary and secondary amines such as aromatic amines such as aniline can be used.

Particularly preferable amine compounds are alkylamines having 4 or less carbon atoms, such as methylamine, ethylamine, n-propylamine, and isopropylamine, and these amine compounds are usually used in the form of an aqueous solution.

The 18i1 degree of the aqueous solution may be adjusted as appropriate for the polyester fiber used so that the cracks slightly reach the conductive portion.

The temperature during the amine treatment can vary over a wide range, but is usually 10
Carry out at a temperature of ~40°C. As the temperature rises, the rate of crack generation tends to become too fast, which tends to cause problems in reproducibility.

Effect> The composite fiber of the present invention is treated with an amine compound to form cracks in the sheath component that extend from the surface to the core component, thereby eliminating the drawbacks of conductive composite fibers in which a conductive component is composited with a core. This solves the lack of antistatic properties.

<Effects of the Invention> The composite fiber of the present invention not only has extremely excellent electrostatic properties, but also can neutralize and remove electric charges around the composite fiber by corona discharge. Therefore, in the form of a continuous filament or staple, other electrostatically controlled! ii) Antistatic properties can be imparted to textile products by mixing with Shaoyu. For example, it can be used for carpets, dust-proof/explosion-proof clothing, beam dust filters, printing/textile screens, clothing linings, etc.

<Examples> The present invention will be explained in detail below using examples. Note that the parts in the examples are heavy items.

Example 1 100 parts of polyethylene and conductive powder W-1 manufactured by Mitsubishi Metals
The core is a resin composition obtained by thoroughly heating and mixing 250 parts of titanium oxide particles coated with tin oxide doped with antimony oxide on the surface of titanium oxide particles, and contains 2.5% titanium oxide. A concentric core-sheath composite 1Ii4 was spun using polyethylene prephthalate as a sheath, stretched to 4-8 at 100°C, and then heat-set at 160°C to obtain a composite fiber. Further, this fiber was 90 denier/6 filaments, and the cross-sectional area of the core was 15% of that of the fiber.

The blended fiber thus obtained was washed by soaking it in 50% ethylamine water at 30° C. for 8 hours. Next, ordinary polyethylene terephthalate drawn yarn (75 denier/
36 filaments) using a circular knitting machine, and at that time,
The above-mentioned amine treated system and untreated system were knitted separately at an interval of 1 out of 10 rounds to create a circular knitted fabric with a mixing ratio of 0.85%, and after removing the spinning oil by smelting, it was thoroughly washed with water and It was dried at 30° C. for 3 hours, and the humidity was further adjusted for 6 hours at 25° C. in an atmosphere of 30% Rtl. Thereafter, it was rubbed 15 times with cotton pad 11 at the same temperature and humidity, and the charged voltage was measured after 10 seconds. As a result, the untreated knitted material had a V of -1-4.5, while the treated knitted material had a voltage of +2.0 KV, showing good power training performance.

Claims (3)

[Claims] (1) A sheath component is obtained by treating a core-sheath type composite fiber, which has a conductive component made of conductive powder and a thermoplastic polymer as a core component and a fiber-forming aromatic polyester as a sheath component, with an amine compound. A method for producing conductive composite fibers, which is characterized by forming cracks extending from the surface to the core component. (2) The method for producing a conductive composite fiber according to claim (1), wherein the amine compound is an alkylamine having 4 or less carbon atoms. (3) The method for producing a conductive composite fiber according to claim (1) or (2), wherein the fiber-forming aromatic polyester is a polyester containing ethylene terephthalate as a main constituent unit.