JPS5994618A - Electrically conductive composite fiber - Google Patents

Abstract

PURPOSE:To obtain an electrically conductive composite fiber having excellent color tone, by bonding a polymer containing minute inorganic short fibers coated with a colorless or white electrically conductive metallic compound with a polymer having high fiber-forming property. CONSTITUTION:The objective fiber is obtained by bonding (A) a polymer (e.g. nylon 6, PE, rayon, acrylic fiber, etc.) containing minute inorganic short fibers (preferably glass fiber having a thickness of 0.05-2mu and length of 2-1,000mu) coated with a colorless or white electrically conductive metallic compound layer (e.g. tin oxide, zinc oxide, indium oxide, cuprous iodide, etc.) at a thickness of preferably 0.01-0.5mu with (B) a polymer (similar to the above examples) having high fiber-forming property, at a composite ratio of preferably 5:95-30:70 in terms of cross-sections.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to conductive composite fibers with excellent color tone.

There is a method to prevent static electricity by mixing a small amount of conductive fibers such as carbon fiber or fibers containing carbon black particles into fiber products that are easily charged with static electricity. The disadvantage is that it is limited.

For this reason, many efforts have been made to whiten conductive fibers. In particular, methods using colorless or white conductive particles such as tin oxide, ml lead oxide, and silk iodide in place of carbon black are attracting attention, and some of them have already been commercialized.

However, these particles require a larger amount to be introduced than in car pump hooks, and problems tend to occur in terms of spinnability, fiber properties, etc. at present.

As a result of various studies in order to improve the above-mentioned drawbacks associated with whitening of conductive fibers, the inventors of the present invention discovered that they have developed conductive micro short inorganic fibers whose surfaces are coated with a colorless or white conductive compound. Used as an imparting substance.

The present invention was developed based on the discovery that a composite fiber made by bonding a polymer containing this compound with a polymer having good fiber-forming properties exhibits extremely favorable effects.

That is, the present invention is made by bonding a polymer (A) containing fine inorganic fibers whose surface is coated with a layer of a colorless or white conductive metal compound and a polymer (B) with good fiber forming properties. The gist is conductive composite fibers.

In the present invention, colorless or white conductive metal compounds include tin oxide (preferably containing a small amount of antimony compound), starved lead oxide (preferably containing a small amount of aluminum compound), isodiuno oxide, dianium iodide, etc. - Substantially colorless or white metal compounds such as copper with good conductivity are used.

Further, as the fine inorganic short fibers, fibers with excellent heat resistance such as glass fibers, alumina fibers, aminosilicate fibers, and asbestos can be used, but glass fibers are preferred from the viewpoint of versatility. The size of micro inorganic short fibers is 0.
05-2p and length 2-1000/7 are suitable. This is because a material of this size is advantageous in terms of surface shape (thread-spinning property) and conductive effect.

The fine inorganic short fibers in the present invention are coated with a conductive metal compound, and such short fibers can be produced by a known method. Namely, vapor deposition method and sputtering method.

IJli! using spray method, electroless plating method, etc.
It is possible to build For example, to create a tin oxide film, there are two methods: spraying an aqueous solution containing @5nC1< as the main component onto heated Gawonu fibers, dipping glass fibers in an aqueous solution containing 5nelt as the main component and then baking them, and physical A method of vapor deposition may be applied.

At this time, it goes without saying that the inorganic fibers may be made into fine short fibers either before or after the coating. and.

The thickness of the conductive layer formed on the inorganic fibers is determined by the required conductivity and performance (the specific resistance of the inorganic fibers is 1 OSΩ・1 or less).

(preferably tL< is preferably 10 3 Ω·α or less), but generally it is 0.005 to 17z, and preferably tL< is 0.01 to 0.57z.

The polymers of components +A) and (B) in the present invention include:

Nylon 6. Nylon 12. Nylon 66, Nylon 6
10. d-lyethylenedere7thaleate, polybutylene terephthalate, poly-p-ethylene oxide #/ = +1・
/%l knee), polyethylene, polypropylene, etc., and polymers with good fiber-forming properties based on these as main components, as well as rayon, Kyuguwa, and acetate.

Glomix, VinyPun, Acryfi/l Polyurethane, Polykufur, Polyvinylidene chloride, Polyvinyl chloride, Poly-p-phenylene terephthalamide.

Recycling of poly-m-phenylene isophthalamide, etc.

Semi-synthetic 1 Examples include polymers that form synthetic fibers (A
) A modifier may be added to the component for the purpose of improving the dispersibility of the conductive fine inorganic short fibers.

(The amount of conductive fine inorganic short fibers to be included in the N component is
The required electrical conductivity is 8 to 70% by weight, which is determined by taking into consideration the type of polymer, yarn-spinning properties, etc.

The content is preferably 10 to 60% by weight.

The composite fiber of the present invention is formed by bonding a polymer (N) and a polymer (B), and has a shape of ■ (having N as a core component and (B) as a sheath component), and ■ (4) having a shape of a sheath component. CB) is the core component, ■ (N is the island component and (B) is the sea component, ■ + A) and tB) are bonded together in a bimeckle shape, ■ (A), ( It is possible to take a usual composite μ anchor, such as a shape in which one of the components in B) is divided into a plurality of regions and exposed on the fiber surface. and (Al
The composite ratio of component and (Bl component) is 3:97 to 40 in terms of cross-sectional area.
:60. Preferably, the ratio is 5:95 to 30 near 0.

The composite fiber of the present invention can be produced by a known method. That is, a polymer (A) of conductive fine inorganic short fibers
The short fibers may be added to a polymer melt or a polymer solution and mixed. Composite fibers can be produced by melt-spinning, wet-spinning, or dry-spinning using ordinary composite spinning equipment. This can be done by a spinning method.

The present invention will be explained in more detail below with reference to Examples.

The electrical resistance value of the composite fiber in the examples is the value when a DC voltage of 1 kV is applied to a thread having a length of 10 threads.

Example Short glass fibers with an average diameter of 0.3 μm and an average length of 50 μm were
(It was treated with an aqueous solution containing Elm as the main component (including a small amount of SbCum), H-baked, and the surface was coated with tin oxide (
Conductive fine inorganic short fibers with an average coating thickness of 0.1 μ) and a specific resistance of 10 Ω·1 were obtained.

Melt 30 parts by weight of this short fiber and more than 70 parts by weight of Holie grain with an index of 50 at 280°C.
17, and almost white chips were obtained.

This chip and a regular nylon 6 chip (containing 5% by weight of titanium oxide particles as a matting agent) were combined to form a concentric core or composite yarn (the conductive part forms the core) with a cross-sectional area ratio of 20:80. Then, using an Ext Q-Goo type melt M composite spinning machine, the yarn was discharged from four spinning holes, and 400
Winding at 0m/min, 40d/4f, pull: 93.0g
/d, elongation 52%,! Qi resistance value 6X10? A white fiber of Ω/compensation was obtained. There were almost no problems such as yarn breakage, and the yarn spinning performance was good.

Comparative Example 1.2 Conductive particles (titanium oxide particles whose surface is coated with a conductive tin oxide film) with an average diameter of 0.21 t and a specific resistance of 10 Ω·α are placed in polyethylene with a melt index of 50.
When the conductive part fj was performed on the chips obtained by blending the heavy and heavy nails (Comparative Example 1) and 65% by weight (Comparative Example 2), the electrical resistance of the composite lj & fiber was 2×10I・07 pieces in Comparative Example 1, which was sufficient. However, in Comparative Example 2, the elongation of the composite IR miscellaneous material was 1.9g.
It was as low as /d.

Patent applicant: Unitika Co., Ltd.

Claims (2)

[Claims] (1) A polymer containing fine inorganic short fibers whose surface is coated with a layer of a colorless or white conductive metal compound (
A conductive composite fiber made by bonding Shu and a polymer (B) with good fiber forming properties. (2) The conductive metal compound is one or more selected from tin oxide, mastic oxide, isodium oxide, cupric iodide, and inorganic substances containing these as main components, and the inorganic short fiber The thickness is 0.05 to 21t. The conductive composite fiber according to claim 1, which is a glass fiber having a length of 2 to 10,007 z.