JPH0561342U - Conductive flooring - Google Patents

Abstract

(57) [Summary] (Modified) [Objective] Solves the problems of abrasion and coloring of conductive particles and chargeability of non-conductive particles, and has excellent electrical performance, abrasion and decoration. Provide a conductive flooring. [Composition] Graphite carbon fibers are added to the surface of a conductive thermoplastic resin back surface layer B having a surface resistance value of 10 ³ to 10 ⁵ Ω by mixing a conductive filler such as carbon black powder with 10 to ³ graphite carbon fibers.
The surface resistance value obtained by mixing the antistatic interface lubricant with the colored conductive thermoplastic resin particles 1 having a surface resistance value of 10 ⁴ to 10 ⁶ Ω and a particle size of 0.5 to 2 mm is 0%. 10 ⁷ to 1
When mixed with the colored antistatic thermoplastic resin particles 2 having a particle size of 0 to ¹⁰ Ω and a particle diameter of 0.5 to 2 mm, the mixing ratio of the conductive particles is 1.
A mixed particle layer B is provided by laminating and fusing multiple mixed particles of 0 to 30% in multiple layers, and the mixed particle layer B has a thickness of 0.1 to 10 μm and a surface resistance value of 10 ⁷ to 10 ^9. It is a conductive flooring material in which a transparent crosslinked resin protective layer C of Ω is laminated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a conductive flooring material used in semiconductor manufacturing factories, precision machine assembly factories, hospitals, computer rooms, etc. to prevent damages and disasters due to electrostatic discharge.

[0002]

[Prior Art]

 Conventionally, in semiconductor manufacturing plants, precision machine assembly plants, hospitals, computer rooms, etc., in order to prevent damages and disasters due to static electricity, the surface of the black conductive thermoplastic resin back layer mixed with carbon black has been used. , Fused and laminated mixed particles of black conductive thermoplastic resin particles mixed with carbon black and colored non-conductive thermoplastic resin particles to partially expose the black conductive particles on the surface, A conductive flooring material having a multicolored surface by being joined to the conductive back surface layer while partially connecting in the thickness direction is excellent in design, and thus is often used.

[0003]

[Problems to be solved by the device]

However, the conductive flooring material in which the mixed particles of conductive black particles mixed with carbon black and non-conductive colored particles are laminated on the surface of the conductive back surface layer is the conductive black particles exposed on the surface. However, since a large amount of carbon black is added to obtain the desired electric performance, it is easily worn. For this reason, it is considered that the surface of the semiconductor manufacturing plant is worn by casters, work shoes, etc., and the resulting carbon black fine particles are not preferable in the semiconductor manufacturing process. In addition, since the conductive particles are mixed with carbon black, it is black and difficult to be colored.If the mixing ratio of the conductive particles is increased, the surface black becomes stronger and the entire surface becomes a dark color, resulting in a good design. Since the mixing ratio of the conductive particles is around 10%, the non-conductive colored particles account for a large proportion, and the surface resistance value of the non-conductive colored particles is 10 ¹² to 10 ¹³ Ω, which is easily charged and the conductive particles are When the mixed particles of the non-conductive particles and the non-conductive particles are sprayed on the surface of the conductive back surface layer, the non-conductive particles are charged by friction when mixed and the non-conductive particles agglomerate or adhere to the machine. As a result, there is a quality problem due to uneven spraying, and static electricity charged on a portion of the surface where non-conductive particles have a large continuous distribution area is not preferable because it is difficult to sufficiently eliminate the static electricity. Furthermore, recently, there has been a demand for a conductive floor material for hospitals and computer rooms, which is made of colored conductive particles other than black and has a bright color tone and excellent decorativeness.

[0004]

[Means for Solving the Problems]

The present invention solves the above-mentioned problems with respect to the wearability and colorability of the conductive particles formed on the surface of the conductive back surface layer and the chargeability of the non-conductive particles, resulting in excellent electrical performance, wear resistance and decorativeness. The surface of the back surface layer of the conductive thermoplastic resin having a surface resistance value of 10 ³ to 10 ⁵ Ω, which is formed by mixing a conductive filler such as carbon black, is provided. In addition, a colored conductive thermoplastic resin particle having a surface resistance value of 10 ⁴ to 10 ⁶ Ω and a particle diameter of 0.5 to 2 mm formed by mixing graphite carbon fiber and an antistatic interfacial lubricant are mixed. The mixed particles having a surface resistance value of 10 ⁷ to 10 ¹⁰ Ω and a particle size of 0.5 to 2 mm and a colored antistatic thermoplastic resin particle are mixed to have a mixing ratio of conductive particles of 10 to 30%. The feature is that the mixed particle layers are integrated by laminating and fusing multiple layers.

[0005]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a partially cutaway perspective view of a conductive flooring of the present invention, where A is a conductive thermoplastic resin back surface layer mixed with carbon black, and B is a layer laminated on the back surface layer A.・ Fused mixed particle layer, 1 is a colored conductive thermoplastic resin particle prepared by mixing graphite carbon fiber, 2 is a non-conductive colored charged mixture prepared by mixing an antistatic interface lubricant The colored conductive thermoplastic resin particles 1 are bonded to the back surface conductive layer B while continuously bonding in the thickness direction. FIG. 2 is a cross-sectional view showing a state in which a transparent crosslinked resin protective layer C is laminated in a thin film on the surface of the mixed particle layer B for surface protection such as abrasion resistance of the conductive floor material.

The back surface layer A of the conductive thermoplastic resin is made of conductive carbon black such as Ketchin black, which is made of soft vinyl chloride resin, ethylene-vinyl acetate copolymer resin, ethylene-acrylate copolymer resin, thermoplastic urethane resin, or the like. An arbitrary amount is mixed with the plastic resin so that the surface resistance value becomes 10 ³ to 10 ⁵ Ω, and a sheet having a thickness of 0.5 to 1 mm is formed by a calender molding machine, an extrusion molding machine or the like.

The conductive particles 1 are made of graphite carbon fibers having a fiber length of 0.5 to 2 mm and a carbonization rate of 97% or more, and the surface resistance value is 10 ⁴ to 10 ⁶ Ω in the same manner as above. It is a mixture of 10 to 30% of thermoplastic resin and made into a sheet by a calender molding machine or an extrusion molding machine, and crushed by a crusher into particles with a particle diameter of 0.5 to 2 mm. Coloring is possible with any colorant. The colored conductive particles 1 are made by mixing a thermoplastic resin with an appropriate amount of graphitic carbon fiber, a coloring agent and the like to form a sheet having a thickness of 0.5 to 2 mm with a calender molding machine or an extrusion molding machine, and then using a crusher. Pulverize to give particles with a particle size of 0.5-2 mm.

However, even in the case of the same carbon fiber, the carbonaceous carbonized fiber having a carbonization rate of 90 to 95% has poorer conductivity than the black leaded carbon fiber, and the preferable surface resistance of the conductive particles 1 is 10 ⁵ Ω. In order to obtain the above, the mixing ratio of graphitic carbon fiber may be 20%, but the mixing ratio of carbonaceous carbon fiber is required to be 35-40%. Moreover, since the elastic modulus is low, the action such as shearing at the time of sheet forming It is not preferable because it is damaged by damage due to short-circuiting, the fibers become short, conductivity is likely to vary, the sheet becomes black, arbitrary coloring is difficult, and abrasion is deteriorated.

Further, in the case of conductive particles obtained by depositing a conductive metal on inorganic particles such as zinc oxide and titanium oxide, a mixing ratio of 60% or more is required to obtain the above electrical performance, and the sheet may be any Coloring is possible, but it is not preferable because it tends to cause variations in electrical performance and lacks wear resistance.

The colored antistatic particles 2 are coated with the above-mentioned thermoplastic resin in an amount of 1 to 5% of a nonionic or cationic antistatic surfactant so as to have a surface resistance value of 10 ⁷ to 10 ¹⁰ Ω. A colorant is mixed and formed into a sheet of 0.5 to 2 mm by a calender molding machine or an extrusion molding machine, and then pulverized by a pulverizer to obtain non-conductive particles having a particle diameter of 0.5 to 2 mm.

The conductive colored particles 1 and the antistatic colored particles 2 thus obtained have a mixing ratio of the conductive colored particles 1 of 10 to 30% and are composed of colored particles of 3 to 4 colors. The mixed particles are sprayed on the surface of the electrically conductive back surface sheet A which has been formed into a sheet in advance so that the particles have a thickness of 2 to 3 mm so as to be overlapped 2 to 4 times, and then heated and pressed at 180 to 200 ° C. At the same time as the mixed particle layer B is formed by fusion, the mixed particle layer B and the back surface layer A are integrally laminated.

Further, in order to improve the abrasion resistance of the surface, an antistatic agent is mixed with urethane-based, acrylic-based, or the like crosslinked resin, and the surface resistance value is 10 ⁷ to 10 ⁹ Ω and the thickness is 0. A transparent protective layer C having a thickness of 1 to 10 μm may be provided on the surface of the mixed particle layer B, but if the thickness is 15 μm or more, the conductivity is deteriorated, which is not preferable.

Next, a concrete embodiment of the present invention will be described. Vinyl chloride resin 100 parts by weight, dioctyl phthalate (plasticizer) 50 parts by weight, barium-zinc stabilizer 3 parts by weight, calcium carbonate (filler) 10 parts by weight, graphitic carbon fiber (conductive agent, fiber length 0.7 mm) , Yarn diameter 13μ) 55 parts by weight (24.7%) and titanium oxide (colorant) 5 parts by weight were mixed and mixed, and a sheet having a thickness of 1 mm was prepared by an extrusion molding machine, and then a crusher was used. Pulverize with to obtain a gray colored conductive particle having an average particle size of 1 mm. On the other hand, 100 parts by weight of vinyl chloride resin, 50 parts by weight of dioctyl phthalate (plasticizer), 3 parts by weight of barium-zinc stabilizer, 3 parts by weight of cationic surfactant (antistatic agent), calcium carbonate (filler) 60 parts by weight and 3 parts by weight of phthalocyanine green (coloring agent) are mixed and mixed, and then a sheet with a thickness of 1 mm is formed with an extruder, and then crushed with a crusher to obtain a green having an average particle size of 1 mm A system of colored antistatic particles is obtained. The obtained gray-based conductive particles and green-based antistatic particles are mixed at a ratio of 1: 9 to obtain surface-layer mixed particles.

Next, 100 parts by weight of vinyl chloride resin, 70 parts by weight of dioctyl phthalate, 3 parts by weight of barium-zinc stabilizer, 30 parts by weight of carbon black, and 100 parts by weight of calcium carbonate were mixed and mixed, and then rolled. After rolling to form a conductive backside sheet with a thickness of 1 mm, the above mixed particles are evenly spread over the surface of the sheet to a thickness of 2.5 mm, and then heated and pressed at 200 ° C to fuse the particles together. At the same time, it was integrally laminated on the back sheet to obtain a sheet-like conductive flooring material having a gray-green two-color pattern with a total thickness of 2 mm. The floor material obtained may be cut into tiles. Regarding the electric performance of the obtained conductive flooring material, the surface resistance value was 1.5 × 10 ⁵ Ω, the volume resistance value was 3.5 × 10 ⁵ Ω, and the electrification voltage was 0V.

[0015]

【effect】

The present invention mixes 10 to 30% of graphitic carbon fiber on the surface of the back surface layer of conductive thermoplastic resin having a surface resistance value of 10 ³ to 10 ⁵ Ω, which is formed by mixing a conductive filler such as carbon black powder. Having a surface resistance value of 10 ⁴ to 10 ⁶ Ω and a particle diameter of 0.5 to 2 mm, which is a mixture of colored conductive thermoplastic resin particles and an antistatic interface lubricant, has a surface resistance value of 10 ⁷ to 10 ¹⁰ Ω and colored antistatic thermoplastic resin particles having a particle size of 0.5 to 2 mm are mixed, and mixed particles having a mixing ratio of conductive particles of 10 to 30% are laminated and fused. And a transparent crosslinked resin protective layer having a thickness of 0.1 to 10 μm and a surface resistance value of 10 ⁷ to 10 ⁹ Ω is laminated on the surface of the mixed particle layer of the conductive flooring. By doing so, by mixing the graphitic carbon fiber as a conductive agent for the conductive particles in the surface layer, Since it can be colored in any color and has excellent decorativeness, and because the graphite-carbon fiber mixed particles have excellent wear resistance, the occurrence of obstacles due to the floating of conductive fine particles due to floor wear is extremely high. Furthermore, by imparting antistatic properties to the non-conductive particles, static electricity is eliminated without charging the distribution area of the non-conductive particles, so there is no electrical obstacle and a flooring material with excellent conductivity is obtained. You can

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view.

[Figure 2] Sectional view

[Explanation of symbols]

A is a back surface layer of a conductive thermoplastic resin, B is a mixed particle layer, C is a transparent crosslinked resin protective layer, 1 is a colored conductive thermoplastic resin particle, and 2 is a colored antistatic thermoplastic resin particle.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Honda 5-3 Higashi-Nakanakamachi, Tsuchiura-shi, Ibaraki Ronseal Industrial Co.

Claims (2)

[Scope of utility model registration request] 1. A graphitic carbon fiber is provided on the surface of a back surface layer of a conductive thermoplastic resin having a surface resistance value of 10 ³ to 10 ⁵ Ω, which is obtained by mixing a conductive filler such as carbon black powder.
A surface resistance value of 10% by mixing 30% and a surface resistance value of 10 ⁴ to 10 ⁶ Ω and a particle diameter of 0.5 to 2 mm by mixing colored conductive thermoplastic resin particles and an antistatic interfacial lubricant. ⁷ to 1
When mixed with the colored antistatic thermoplastic resin particles having a particle size of 0 to ¹⁰ Ω and a particle size of 0.5 to 2 mm, the mixing ratio of the conductive particles is 10
A conductive flooring material comprising a mixed particle layer in which mixed particles of up to 30% are stacked and fused in multiple layers. 2. The surface of the mixed particle layer of the conductive floor material,
Thickness is 0.1-10μ and surface resistance is 10 ⁷ -10 ⁹ Ω
An electrically conductive flooring material, characterized in that the transparent crosslinked resin protective layer (1) is laminated.