JPH0658000B2 - Conductive decoration material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is a conductive decorative sheet or tile suitable for floor materials in factories, laboratories, operating rooms, and various clean rooms that handle electronic parts such as IC and LSI. The present invention relates to a conductive decoration material.

(Prior Art) Conventionally, ICs and LSIs have been used to avoid the occurrence of electrostatic damage.
Known floor materials made of plastic or rubber filled with a large amount of conductive carbon black are used in factories, laboratories, operating rooms, etc. that handle electronic components such as. However, even though these floor materials have an antistatic effect, the surface of the floor material is black, and the design is low as an interior material. In order to solve this problem, Japanese Patent Publication No. 60-6429 proposes an interior material composed of a non-conductive colored pellet and a conductive pellet. This interior material has a design property and exhibits a considerable antistatic effect, but this floor material also uses black pellets using conductive carbon black as the conductive pellets, and the overall color is dark. It was a thing. If this floor material is used in an electronic parts factory that handles ICs, LSIs, etc.
A voltage of 300 V or higher was applied to 10 KV, causing a voltage breakdown of electronic components. This voltage breakdown means that when the human body is compared to a capacitor, the electric charge accumulated in the human body flows out to the electronic parts and destroys the electronic parts. This voltage breakdown always occurs when the charged voltage is 100 V or higher, and in order to prevent this, the charged voltage is preferably 50 V or lower, and more preferably 30 V or lower.
However, the above-mentioned known flooring material has a problem that the electric charge charged on the non-conductive chip is not easily removed and voltage breakdown is induced. Furthermore, in the floor finishing material using the above-mentioned conductive carbon black, dust of fine carbon black floats in the air due to abrasion of the surface, and it is clean in factories, laboratories or clean rooms that handle ultra-LSI, precision electronic parts, etc. However, the degree of deterioration was unfavorable.

(Problems to be Solved by the Invention) An object of the present invention is to provide a conductive decorative material having excellent design performance and bright color as well as excellent conductive performance.

Another object of the present invention is to provide a conductive decorative material that does not have the problem of dust and the like.

(Means for Solving the Problems) The present invention comprises (a) a conductive resin layer containing conductive fibers, (b) an aggregate layer of pattern pieces containing an antistatic agent provided thereon, (c) The present invention relates to a conductive decorative material, wherein the conductive fiber-containing resin is permeated and filled in a gap between the pattern pieces.

The present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of the decorative material of the present invention, and FIG. 2 is a partially enlarged view of the surface layer of FIG. FIG. 3 is a partially enlarged view of the surface layer further containing a pellet containing conductive fibers. FIG. 4 is a rear view of the decorative material of the present invention shown in FIG. 1 is a conductive backing material provided if necessary, 2 is a conductive fiber 3
A conductive resin layer containing 4; a pattern piece containing an antistatic agent; 5 an aggregate layer of the pattern pieces 4; 6 a conductive resin layer exuded and permeated into the gap between the pattern pieces 4; Is a pellet containing conductive fibers.

In the electromotive decorative material of the present invention, for example, the paste-like thermoplastic resin 2 containing the conductive fibers 3 is applied on the conductive backing material 1, and the pattern pieces 4 are spread on the conductive backing material 1 in a predetermined amount, preferably 160 By heating and pressurizing at ~ 220 ° C to integrate them, the thermoplastic resin 2 containing the conductive fibers 3 is filled and formed in the gap between the pattern pieces 4 to form the pattern pieces 4.
It is obtained by forming the aggregate layer 5 of.

In the present invention, as the conductive fiber, for example, carbon fiber, metal fiber, metal vapor deposition fiber or the like is used. The average fiber length of these conductive fibers is preferably 0.1 to 10 mm, more preferably 0.5 to 5 mm. The average fiber diameter is preferably 5 to 50 μm, more preferably 10 to 20 μm. Examples of the thermoplastic resin that is a matrix resin of conductive fiber include polyvinyl chloride (PVC) or its copolymer, ethylene-
Vinyl acetate copolymer (EVA), polyethylene (PE),
Examples thereof include polypropylene (PP) and attack poly α-olefin (APAO). The content of the conductive fibers in this matrix resin is preferably in the range of 0.5 to 5% by weight. In addition to the conductive fibers, the pellet 7 containing the conductive fibers may be blended in the conductive resin layer. The pellets are obtained by containing the conductive fibers in the same pellets as the matrix resin of the conductive fibers, and by blending the pellets, more excellent conductivity can be obtained. The range of 1 to 10% by weight in the matrix resin is preferable.

In the present invention, as the conductive backing material, for example, a sheet obtained by kneading a conductive carbon black or the like in the same matrix resin as described above is suitable. When the backing material 1 is not provided, it is preferable to provide the conductive resin layer on a release paper or the like. The coating thickness of the conductive resin containing the conductive fiber is preferably 0.1 to 2 mm, more preferably 0.2 to 0.7 mm.

Next, in the present invention, an aggregate layer 5 of the pattern pieces 4 made of a thermoplastic resin which does not contain conductive fibers and is provided with an antistatic property by an antistatic agent is provided on the conductive resin layer. As the thermoplastic resin which is the matrix resin of the antistatic agent, the same one as the matrix resin of the above conductive fibers can be used.

In the present invention, various surfactants can be used as the antistatic agent. As the surfactant, for example, any of the following anionic type, nonionic type, cationic type, and amphoteric type can be used.

Anionic surfactant Higher alcohol sulfate ester salt, alkylbenzene sulfonate, alkylnaphthalene sulfonate, phosphate ester salt, fatty acid ethyl sulfonate, fatty acid salt Cationic surfactant alkylamine salt, polyoxyethylene alkylamine salt , Quaternary ammonium salts Nonionic surfactants Partial fatty acid esters of polyhydric alcohols, polyoxyethylene alkyl ethers, polyoxyethylene alkylphenyl ethers, polyoxyethylene acyl esters, polyethylene glycols, polyoxy Ethylene alkylamines Amphoteric surfactants Alkyl betaines, imidazoline sulfates If desired, cresyl diphenyl phosphate, tricresyl phosphate, dioctyl phosphate Ether, phosphoric acid triamyl esters, phosphoric acid (2-butoxyethyl), can be added phosphoric acid ester-based conductive plasticizers such as phosphoric acid (2-chloroethyl) ester. The content of the antistatic agent is 1 in the matrix resin.
The range of 5 wt% is preferred. The size of the pattern piece 4 is 0.5
It preferably has a particle size of ˜5 mm.

In the present invention, the pattern piece 4 is arranged on the conductive resin layer 1 and heated and pressed to fill and mold the conductive resin in the gap between the pattern pieces 4 so that the desired conductive decoration can be obtained. The material is obtained. At this time, some of the conductive fibers 3 are present in the exuded resin portion 6 and the conductivity of the decorative material in the vertical direction becomes very good. Moreover, it is difficult to capture it with the naked eye in the amount of the above-mentioned conductive fibers added, and therefore it seems that no conductive fibers are present, and there is nothing that impairs the design of the appearance, and is free. Can have a light color scheme. Therefore, it is possible to obtain an arbitrary design without obtaining a black color like a conductive flooring material or obtaining only a dark color. In addition, the conductive fibers, which are difficult to capture with the naked eye, are dispersed in the thermoplastic resin in a entangled state, and this gives a very good conductivity because the conductive base material is energized. As described above, the electric charge of the decorative material itself and the electric charge of the human body contacting the decorative material can be easily dissipated, and remarkable conductivity can be obtained as the entire decorative material.

In the present invention, the conductive fibers are entangled in the horizontal direction in the conductive resin layer as shown in FIG. 1, and further entangled in the vertical direction as shown in FIG. Further, the conductive fibers are three-dimensionally entangled with each other to effectively obtain the conductivity.

Generally, the human body voltage due to walking on the floor material of an operating room of an electronic parts handling factory or a hospital is 50 V or less, preferably 30
In contrast to V or less, the decorative material of the present invention exhibits an astonishing performance of 20 V or less, such as a voltage breakdown accident in a factory handling IC, LSI or the like, a fire caused by a human body discharge in an operating room, or an electronic device It is useful as a floor material to prevent accidents such as malfunctions.

Further, in the conventional conductive flooring material, since a large amount of carbon black and conductive fibers are exposed on the surface, fine carbon powder is scattered and cannot be used in a clean room or the like, whereas the decorative material according to the present invention is applied on the surface. In practice, the conductive fibers are emitted only to the extent that it is difficult to capture them with the naked eye, and dust is hardly generated even in a clean room, so that the conductive fibers can be suitably used.

(Effect of the invention) 1. A pattern piece made of a thermoplastic resin that has been given antistatic properties with an antistatic agent can be colored at will, and the thermoplastic resin exuded from the gap between the pattern pieces can also be colored at will. Since it is difficult for the conductive fibers to be caught with the naked eye, it is possible to obtain a very high light-coloring property and conductivity which cannot be obtained by any conventional conductive flooring material.

2. Since no carbon black or conductive fibers were exposed on the surface, almost no dust was generated.

3. Even with the Honest meter method, the charged voltage is only about 7V per 10KV, and the charged voltage of the human body is low.
It has prevented accidents such as voltage breakdown and malfunctions of electronic devices.

4. Whereas the conventional antistatic treatment was largely dependent on humidity, the decorative material of the present invention provided excellent conductive performance without depending on humidity.

5. Furthermore, by combining the conductive fiber and the conductive pellet, a more excellent conductive effect was obtained.

(Example) Hereinafter, the present invention will be described with reference to examples.

Example A toner was added to the PVC paste of the formulation A to give a light blue color, and the conductive liner having a carbon black content of 0.
3 types of dark blue, blue, and light blue sheets made by adding pigments to the paste of formulation B to form a sheet with a thickness of 3 mm were crushed, and the average particle size was 2 mm The pattern pieces were scattered, heated at 200 ° C., and then pressure-integrated to obtain a conductive floor material of the decorative material of the present invention.

From the surface of this floor material, it was difficult to capture the conductive carbon fiber with the naked eye, and a floor material having a very high light-coloring property and an excellent design was obtained.

(Compound A) PVC (Kanebuchi Chemical Industry, Kanevinyl Paste PSL-10) 100 parts Filler (calcium carbonate) 5 parts Plasticizer (dioctyl phthalate) 40 parts Stabilizer (Ba-Zn) 2 parts Carbon fiber ( (Average fiber length 3 mm, average fiber diameter 13 μm)
3 parts (formulation B) PVC (electrochemical industry, SS-80) 100 parts Filler (calcium carbonate) 50 parts Epoxy (Adeka Argas, O-130P) 4 parts Plasticizer (dioctyl phthalate) 40 parts Stabilizer (Ba- Zn type) 4 parts Antistatic agent (polyoxyethylene alkylamine salt) 2 parts The floor material of the obtained example is (1) electrified voltage of the floor material by the Honest meter method (according to JIS L1094) (2) Walking Human body voltage (according to JIS L1021) (3) The electrical resistance value between the ground surface and the ground was measured by the NFPA method. All measurement conditions were 20 ° C and 20% relative humidity. The results are shown in Table 1.

As shown in Table 1, the decorative material of the present invention showed excellent conductive performance, and did not cause voltage breakdown of IC, LSI and the like and malfunction of electronic equipment and the like.

[Brief description of drawings]

FIG. 1 is a sectional view of the decorative material of the present invention, and FIG. 2 is a partially enlarged view of the surface layer of FIG. FIG. 3 is a partially enlarged view of the surface layer further containing a pellet containing conductive fibers. FIG. 4 is a rear view of the decorative material of the present invention shown in FIG. 1 is a conductive backing material provided if necessary, 2 is a conductive fiber 3
A conductive resin layer containing 4; a pattern piece containing an antistatic agent; 5 an aggregate layer of the pattern pieces 4; 6 a conductive resin layer exuded and permeated into the gap between the pattern pieces 4; Is a pellet containing conductive fibers.

Claims (3)

[Claims] 1. A conductive resin layer containing (a) a conductive fiber, (b) an aggregate layer of pattern pieces containing an antistatic agent provided thereon, and (c) a space between the pattern pieces. The conductive decorative material is characterized in that the above-mentioned conductive fiber-containing resin is permeated and filled in the gap of the above. 2. The conductive decorative material according to claim 1, wherein a conductive backing material is laminated on the back surface of the conductive resin layer. 3. The conductive decorative material according to claim 1, wherein the conductive resin layer further contains a pellet containing conductive fibers.