JPS6385113A - Electrically conductive conjugate fiber - Google Patents

Abstract

PURPOSE:To obtain the titled dyeable conjugate fibers, consisting of a fiber- forming polymer component and polymer component containing an electrically conductive substance consisting of fine copper iodide particles and fine electrically conductive titanium oxide particles subjected to specific treatment, having good color tone without deteriorating electric conductivity. CONSTITUTION:Conjugate fibers obtained by spinning (A) a component consisting of a fiber-forming thermoplastic polymer, e.g. polyethylene terephthalate, etc., as a core part and (B) a component prepared by blending a mixture of fine copper iodide particles with fine electrically conductive titanium oxide particles having surfaces coated with stannic oxide adjusted to <=100OMEGA.cm volume resistivity value as an electrically conductive substance with a thermoplastic polymer, e.g. polyethylene, etc., as a sheath part using a concentric sheath-core conjugate spinning machine. The amount of the electrically conductive substance in the component (B) is preferably 100-340pts.wt. based on 100pts.wt. thermoplastic polymer in the component (B).

Description

[Detailed Description of the Invention] [Technical Field] The present invention is directed to conductivity III, particularly to iodine-1 as a conductive substance.
The present invention relates to a novel conductive composite fiber containing a mixture of W4 fine powder and titanium oxide fine particles whose surface is coated with stannic oxide.

<Prior art> Synthetic IJAMs, such as polyester fibers and polyamide fibers, have low conductivity and are likely to generate static electricity due to friction.
High potential charging reaching up to KV was observed, causing dust adhesion,
Various problems occur due to discharge.

In order to solve this problem, it is known to mix conductive fibers into textile products, such as metal fibers, metal-plated MRA, and fibers coated with polymer dope containing conductive substances.

Fibers containing carbon black 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 their conductive performance decreases when they are bent during processing or use, they are not easy to mix with other fibers, inter-knit, or inter-weave, and they also have a color tone unique to metals. It has many drawbacks such as: In addition, since it is necessary to form a uniform and continuous plating layer on the tlilt surface of metal-plated fibers, the fiber surface must be smooth, which greatly limits the types of fibers that can be applied. Processing must be done accurately;
It has many drawbacks, such as extremely high manufacturing costs, low durability as the plating layer easily peels off during processing or use, and a color tone unique to metals. Fibers coated with polymer dope containing conductive substances are also expensive to manufacture.

It has the same drawbacks as the above-mentioned metal plated fibers, such as peeling. Carbon black-containing fibers are colored black with carbon black, and when mixed with synthetic fibers, the appearance is significantly impaired, which has the fatal drawback of limiting the field of use.

In order to improve the drawbacks of carbon black-containing fibers, research is being conducted on conductive composite fibers containing a white conductive substance as one component. In particular, cuprous iodide fine particles are white and exhibit good electrical conductivity. However, copper iodide fine particles have poor dispersibility in thermoplastic polymers,
Stable spinning is difficult due to frequent clogging of spinning pack filters and spinning holes, and yet it is possible to obtain! ! The electrical conductivity of fibers is also significantly inferior to that of carbon black-containing fibers, so they have not been put to practical use.

On the other hand, it has been proposed to use conductive titanium oxide fine particles whose surfaces are coated with stannic oxide which has developed sufficient conductivity by doping with an appropriate amount of antimony trioxide. However, fibers obtained using such conductive titanium oxide fine particles also have significantly inferior conductivity compared to carbon black-containing fibers, and are used in fields that require particularly high performance, such as non-slip clothing for high-level clean rooms. cannot be used for

<Structure of the Invention> As a result of studies to improve the drawbacks of such white conductive material-containing composite fibers, the present inventors have developed a conductive titanium oxide whose surface is coated with copper iodide fine particles and conductive tin oxide. We discovered that by using a mixture of fine particles, the dispersibility of copper iodide fine particles in a polymer was dramatically improved, and surprisingly, conductivity comparable to that of TL navy blue containing carbon black could be obtained. This invention has been achieved.

That is, the present invention consists of a fiber-forming thermoplastic polymer (A
) component and <8) component consisting of a mixture of a conductive substance and a thermoplastic polymer, the composite fiber being formed from a component (
B) The conductive substance in the component is a mixture of copper iodide fine particles and conductive titanium oxide fine particles whose surface is coated with stannic oxide whose volume resistivity is adjusted to 100Ωα or less. .

The thermoplastic polymer constituting component (A) of the fiber of the present invention may be any fiber-forming polymer, particularly nylon-
6. Polyamide such as nylon-6,6, nylon-12, polyethylene terephthalate.

Preferred are polyesters such as polybutylene terephthalate, polyolefins such as polyethylene and polypropylene, acrylic polymers, polyurethanes, and modified products thereof.

Component (A) may contain optional additives, such as a matting agent, a coloring agent, an oxidation stabilizer, and a dyeability improver, as required.

The component ([3) constituting the conductive portion of the conductive fiber of the present invention is copper iodide fine particles and conductive titanium oxide fine particles whose surfaces are coated with stannic oxide whose volume resistivity is adjusted to 1000·α or less. It consists of a thermoplastic polymer.

To adjust the volume resistivity of tin oxide to 1000 cm or less, for example, a trivalent antimony compound such as antimony trioxide is mixed with di A method of adding it to tin and firing it at a high temperature is preferably adopted.

There is no particular restriction on the relative ratio of copper iodide fine particles and conductive titanium oxide fine particles whose surfaces are coated with tin oxide in component (B), and either one may be the main component. However, in order to fully exhibit the synergistic effect of the copper iodide fine particles and the conductive titanium oxide fine particles in the conductive performance, it is preferable that the content of both is at least 5% by weight or more. That is, it is preferable that the weight ω ratio of copper iodide fine particles to conductive titanium oxide fine particles is 5295 to 95:5.

In addition, as the thermoplastic polymer in component (B), polyethylene, polypropylene, polystyrene, polybutadiene, polyisoprene, nylon-6, nylon-6,6,
The main targets are polyethylene terephthalate, polybutylene terephthalate, etc., but some of these may be replaced with copolymerized components, and thermoplastic resins other than those listed above may be used depending on the purpose. Furthermore, if necessary, a mixture of two or more of them may be used.

To mix the polymer in component (B) and the conductive fine particles, any method can be used as long as it can be well dispersed. The amount of the biconductive fine particles to be mixed varies depending on the required conductive performance, but For conductive fibers for antistatic purposes, the resistance to IKV DC voltage is 10'2 Ω/Cr1l or less, especially 107 Ω/cm to make carbon black-containing 1!1 fibers.
Since the following electric resistance is required, the volume electric resistance of component (B) is 1 when considering the decrease in conductivity during stretching after spinning.
0.03Ω・cm or less is required. For this reason, it is necessary to make the polymer at least 1.0 times heavier than the polymer in component (B). on the other hand,
If the amount of conductive fine particles mixed is too large, it will be difficult to adjust and spin component (B), so it is appropriate to adjust the amount to 3.4 times the weight of the polymer in component B) or less.

In addition, optional additives may be added to component (B) as needed.
For example, a matting agent, a coloring agent, an oxidation stabilizer, etc. can be included.

The shape of the composite fiber composed of the above components (A) and (B) may be either side-pie-side type or core-sheath type, and the cross-sectional shape of the (B) component, which is the conductive component. is arbitrary and can take any form. Also (B
) The number of components can also be selected from one or more.

The ratio of the (A) component and (B) component in the m rough cross section is:
Although the range can be wide, if the ratio of component (B) becomes too large, the strength of the resulting conductive fiber will decrease, so the area occupied by component (B) in the cross section of the fiber is 50% or less. is preferred. In addition, the lower limit of component (B) is not particularly necessary as long as component (B) is continuous along the jmlfi axis direction, but it is usually 1% or more in terms of area in the fiber cross section, especially 3% or more. It is preferable to do so.

To produce such a composite fiber, it is not necessary to employ any special method or conditions, and the spinning method and conditions for producing a composite fiber consisting of two components can be arbitrarily applied depending on the component (A). Also, after spinning! The I fibers are drawn as necessary.

<Operation of the invention> The conductive composite t[ of the present invention is made of copper iodide as conductive fine particles and secondary oxide with a volume resistivity adjusted to 1000 cm or less.
By using conductive titanium oxide whose surface is coated with tin, the drawback of white conductive fine particles, which is that they have low conductivity compared to carbon, is overcome.

<Effects of the Invention> The conductive composite fiber of the present invention has an extremely good color tone and can be dyed into any color by a conventional method, and its conductive performance is as high as that of conventional carbon-containing tiHilt.
In addition, its conductive performance does not deteriorate during processing or use, which eliminates all the drawbacks of conventional conductive fibers, and it can be applied to any field that requires conductive performance. be.

<Example> The present invention will be explained in further detail by giving examples below.

The conditions for measuring the cross-sectional electrical resistance of conductive fibers in Examples are 20° C., 30% RH, and IKV DC voltage.

Example 100 parts of polyethylene were mixed with copper iodide fine particles (manufactured by Isankinzoku@) and '4-electrode titanium oxide fine particles W-1 (Mitsubishi Metals Beta 1).
A conductive polymer composition obtained by sufficiently heating and mixing in a mixing machine the amounts shown in Table 1 of titanium oxide particles doped with antimony oxide and coated with tin oxide (volume resistance value 50 Ω cIR). A concentric core-sheath composite RAN was melt-spun with RAN as a core and polyethylene terephthalate containing 2.5% titanium oxide as a matting agent as a sheath, stretched 4 times at 100℃, and heated at 160℃ Fixed and combined! lH was obtained. This am I! Core part in Meiji Restoration cross section:
The sheath area ratio was 1:6 and the 1M configuration was 30 denier/3 filaments. The cross-sectional electrical resistance values of the obtained fibers are also shown in Table 1.

Table 1 In preferred experiments No. 013 to 7 according to the present invention, the cross-sectional electrical resistance of the composite fiber was one order of magnitude lower than in Experiment No. 1, which was made only of conventional conductive titanium oxide, and was made only of iodized steel. In Experiment No. 009, spinning was impossible due to poor dispersibility of the iodized steel, but the addition of conductive titanium oxide made spinning possible, and high-performance conductivity was exhibited.

In both experiments No. 12 and No. 8, the addition of iodized steel or conductive titanium oxide was not sufficient, so the effect was not sufficient.

Claims (3)

[Claims] (1) Component (A) consisting of a fiber-forming thermoplastic polymer and component (B) consisting of a mixture of a conductive substance and a thermoplastic polymer.
) component, wherein the conductive substance in component (B) has a volume resistivity of 100Ω with copper iodide fine particles.
・A conductive composite fiber that is a mixture of conductive titanium oxide fine particles whose surface is coated with stannic oxide adjusted to a size of less than cm. (2) The amount of the conductive substance in component (B) is 100 to 340 parts by weight based on 100 parts by weight of the thermoplastic polymer in component (B).
The conductive composite fiber according to claim 1, which is in parts by weight. (3) The conductive composite fiber according to claim 1 or 2, wherein the weight ratio of copper iodide fine particles to conductive titanium oxide fine particles in the conductive substance is 5:95 to 95:5.