JPS6385112A - Electrically conductive conjugate fiber - Google Patents

Abstract

PURPOSE:To obtain conjugate fibers, by sealing and wrapping a core component consisting of an electrically conductive polymer in a sheath component consisting of an electrically nonconductive polymer containing ferroelectric powder in a specific proportion, having improved antistatic propery and capable of imparting antistatic properties to textile products by blending in a trace amount therein. CONSTITUTION:A core component obtained by blending (A) electrically conductive powder, e.g. carbon black, etc., with (B) a thermoplastic polymer and a sheath component prepared by blending (C) a fiber-forming electrically nonconductive polymer with (D) ferroelectric powder, e.g. barium titanate, etc., in an amount of 0.01-10wt% based on the sheath component are melt spun in, e.g. a concentric sheath.core conjugate structure, to afford the aimed conjugate fibers. The component (A) in the core component is blended in an amount of 40-300pts.wt. based on 100pts.wt. component (B) and the conjugate ratio of the core component is preferably 5-50%.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a conductive composite fiber. More specifically, the present invention relates to a conductive composite wire mK, which is a composite fiber consisting of a core component containing conductive particles and a non-conductive sheath component, and exhibits excellent antistatic performance.

<Prior art> Synthetic fibers, such as polyester fibers and polyamide fibers, have low conductivity and are likely to generate static electricity due to friction.
High potential charging is observed, which leads to adhesion of AI dust and various problems associated with discharge.

In order to solve this problem, it is known that conductive fibers should not be mixed with fR textile products, and gold N4 as conductive fibers
Fibers, metal-plated fibers, fibers coated with polymer dope containing conductive substances, composite fibers containing conductive substances, etc. have been proposed.

However, all of these conventional conductive fibers had serious drawbacks and were not satisfactory. For example, metal fibers do not have bending recovery properties, so bending during use or processing can cause a drastic drop in performance, mixing with other fibers, and cross-knitting.

It has many drawbacks, such as not being easy to mix and match, and furthermore, having a color tone unique to gold.

In addition, fibers plated with metal or fibers coated with polymer dope containing conductive substances are extremely expensive to manufacture, often peel off due to bending or friction during processing or use, and have poor durability. etc. It has many drawbacks.

In order to eliminate this drawback, carphone black and metal powder
A fiber has been proposed that is a composite of a thermoplastic polymer in which 2J4 electrically conductive particles are dispersed and a fiber-forming polymer.

However, composite fibers in which a conductive component containing conductive particles is completely encapsulated with a non-conductive component have a drawback of poor antistatic properties. In addition, in composite fibers in which a part of the conductive component is exposed on the fiber surface, the conductive component is exposed on the fiber surface, which deteriorates the discharge property (antistatic property), but due to chemical treatment and bending abrasion, the conductivity The disadvantage is that the components are destroyed.

<Object of the invention> The object of the present invention is to provide a composite fiber that has excellent chemical resistance and bending abrasion resistance because it is a composite fiber in which a conductive component is completely encapsulated with a non-conductive component, and in which the conductive component is exposed on the surface. It is an object of the present invention to provide a conductive composite fiber having antistatic performance equivalent to that of the present invention.

<Structure of the Invention> As a result of studies aimed at achieving the above object, the present inventors have developed a conductive composite comprising a conductive polymer containing conductive particles as a core component and a non-conductive polymer as a sheath component. It was discovered that the antistatic performance could be significantly improved by mixing a small amount of ferroelectric particles between the conductive core and the fiber surface, that is, in the non-conductive sheath, and this led to the completion of the present invention. It's arrived.

That is, the present invention provides a conductive composite VI fiber having a conductive component made of conductive particles and a thermoplastic polymer as a core component and a fiber-forming non-tetraelectric polymer as a sheath, wherein the sheath component is The present invention relates to a conductive composite fiber containing 0.01 to 10% by weight of ferroelectric particles.

Conductive powders include single powders such as carbon and metals, metal oxide powders such as tin oxide and zinc oxide rings, metal compound powders such as sulfide steel, iodide mesh, and zinc sulfide, and these powders as well as titanium oxide and others. Coated powder is used.

Examples of thermoplastic polymers containing conductive powder include polyethylene, polypropylene, polystyrene, polystadiene, polyisoprene, and nine-6. Naipun-6,6
．． The main targets are polyethylene terephthalate, polybutylene terephthalate, etc., 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. Good too,
Furthermore, if necessary, two or more of these may be mixed. In addition, since such a polymer needs to contain conductive powder, it is preferable that the melt viscosity is relatively low, and after mixing the conductive powder, molding conditions are
It is preferable that it is 00 to 50,000 poise.

The amount of conductive powder to be mixed varies depending on the type of conductive powder and is difficult to determine unambiguously, but it is generally used in an amount of 3.0 to 300 parts by weight per 100 parts by weight of the polymer. Preferably it is 4'04 to 300 parts by weight, and as much as possible is preferable in terms of performance. However, if 300 parts by weight or more is mixed, it may not be possible to mix sufficiently.

It also has poor fluidity and is unfavorable in terms of operation. Such conductive powder may be subjected to surface treatment to increase its affinity with resin, long-chain fatty acids may be added to the polymer, or a plasticizer may be added.

The conductive powder and the mixture are sufficiently kneaded to form a core component. This mixing may be performed in a molten state, or may be performed by kneading with a solvent and then drying.

The fiber-forming polymer constituting the sheath component of the fiber of the present invention may be any fiber-forming polymer, including nylon-6,
Preferred are polyamides such as nylon-6, 6 and nylon-12, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyolefins such as polybupylene, acrylic polymers, polyurethanes, and modified products thereof.

The ferroelectric powder contained in the sheath component is Rochelle salt N.
aK(C,H40=)4Hρ, potassium dihydrogen phosphate K
H2PO,,guanidine aluminum sulfate yagi compound NH
C(NH,), AA'H(SO2), 6H,0, sulfate purisif (CHNvO-OH)Jl! SO,, Barium titanate BaTtOm+ Sodium niobate NaN
bO4, lithium niobate LiNb0. .

Lithium tantalate LiTa0□, Sodium nitrate Na
In general, composite fibers with a conductive component as a core and a non-conductive component as a sheath exhibit a certain degree of antistatic properties because the sheath made of a non-conductive polymer partially causes dielectric breakdown. However, dielectric breakdown of the sheath requires a certain high voltage, for example, below 5 kV, especially below 3 kV, causing corona discharge. The present invention has found that the antistatic properties of core-sheath composite conductive fibers can be improved by mixing a small amount of ferroelectric powder in the sheath. It is thought that this is because dielectric breakdown is more likely to occur due to polarization.

The amount of ferroelectric powder contained in the sheath component is 0.01 to 10
It needs to be in weight percent. If it is less than 0.01% by weight, the probability of breaking the insulation of the sheath and causing corona discharge is small, and a sufficient antistatic effect cannot be obtained, and even if it is added in an amount exceeding 10% by weight, the antistatic effect will no longer improve. is small, and in addition, light breakage during the spinning and drawing process tends to become noticeable.

The composite ratio of the core, which is a conductive component, and the sheath, which is a non-conductive component, can vary over a wide range, but in general, a conductive layer containing a large amount of conductive powder tends to be inferior in strength, elongation, etc. 60%
is preferable, and in particular about 5 to 50% is often preferable. The cross-sectional shape of the composite fiber and the cross-sectional shape of the conductive component core are arbitrary, and any shape is possible. Further, the number of cores can be selected from one or more.

Of course, there is no problem even if the core is eccentric.

<Actions and effects of the present invention> The composite fiber of the present invention has a conductive component in the core by interposing a very small amount of ferroelectric particles between the conductive layer (core) and the fiber surface, that is, in the sheath component. This eliminates the lack of antistatic properties, which is a drawback of conductive composite fibers.

The composite fiber of the present invention has extremely excellent antistatic properties on its own, and it also has excellent antistatic properties around the composite fiber. Is it possible to neutralize and remove the electric charge caused by lf[ by corona discharge? Therefore, it can be mixed in a very small amount with other chargeable fibers in the form of continuous filaments or staples to impart antistatic properties to textile products.

For example, it can be used for carpets, dust-proof/explosion-proof clothing, dust filters, printing/textile screens, clothing linings, etc.

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

Example 1 Melt index 75 (JIS K6760-1
A conductive component obtained by uniformly dispersing and mixing 30 parts of conductive carbon black in 70 parts by weight of polyethylene (971) is referred to as AI.

Components obtained by kneading barium titanate powder in the amount shown in Table 1 into polyethylene terephthalate having an intrinsic viscosity [η) of 0.64 are designated as B1-B5.

A concentric sheath-core composite structure was melt-spun using AI as a core component and B1 to B5 as sheath components.

The composite ratio (volume) of A1 and Bl to B5 is 126, and the spinning temperature is 290°C, 8007+! It was rolled up at a speed of / minute.

Next, the drawn yarn Yl-Y5 of 30 denier/3 filaments was stretched at a draw ratio of 3.5 times using a heated roller at 85°C, and then rolled up after being brought into contact with a heated plate at 180°C.
I got it.

Next, ordinary drawn polyethylene terephthalate yarn (75 denier/36 filaments) was knitted using a circular knitting machine.

At that time, the above yarns Yl-Y5 were knitted at intervals of 1 out of every 10 turns to create a circular knitted fabric with a mixing rate of 0.85%. After removing the spinning oil by scouring, it was thoroughly washed with water, dried at 80°C for 3 hours, and then further conditioned for 6 hours in an atmosphere of 25°C and 30% RH. After that, 15 minutes with cotton cloth at the same temperature and humidity.
It was rubbed twice, and the charged voltage was measured after 10 seconds.

The results are also shown.

In Bl and B2, beryum titanate powder is not added to the sheath component, or even if it is, the amount thereof is insufficient, resulting in insufficient antistatic performance. In addition, %B5 contained too much titanium-dispersed barium, which caused frequent thread breakage during spinning and drawing, making it unsuitable for practical use. In comparison, B3 and B of the present invention example
No. 4 showed good antistatic performance.

Example 2 The conductive component At of Example 1 was used as a core component, and component B6, which was 0.1 wt% of sodium nitrate powder kneaded into polyethylene terephthalate having an intrinsic viscosity (77) of 0.64, was used as a sheath component. In the same manner, Shima drawn yarn Y6 was obtained.

The spinning and rolling properties were good, and the frictional charging voltage measured in the same manner as in Example 1 was 2.2 kV, indicating good antistatic performance.

Claims (1)

[Claims] A conductive composite fiber having a core made of a conductive component made of conductive powder and a thermoplastic polymer and a sheath made of a fiber-forming non-conductive polymer, wherein the sheath component contains 0 ferroelectric powder. .01~1
A conductive composite fiber containing 0% by weight.