JPS6331959Y2 - - Google Patents

Description

[Detailed explanation of the idea] <Technical field> The present invention relates to a conductive decorative board.

<Prior art> Conventionally, non-conductive wood or synthetic resin decorative materials have been used for the surface materials of laboratory tables used for various experiments, work tables used for various tasks, etc.
Static electricity was generated when a container containing an organic solvent was moved or when the organic solvent was transferred into the container, causing electricity to accumulate on the surface of the container. Particularly in winter, when the humidity is low, discharge may occur when other items come into contact with the container, which is extremely dangerous if vapors of organic solvents, gasoline, etc. are present indoors. Furthermore, when static electricity is generated within the system of parts, assemblies, etc. during the assembly of precision electronic products (semiconductor elements such as ICs, LSIs, and related electronic equipment products), the problem arises that the original functions cannot be maintained. Furthermore, in precision assembly work for watches and the like, static electricity generated on the surfaces of parts, assemblies, etc., causes dirt and dust to adhere indoors, resulting in a problem of deteriorating the quality of the product.

In order to solve the above problem, a method of bonding a plastic sheet mixed with carbon black, copper powder, etc. to the surface of the workbench was considered, but since it has a black or specific color, it is not suitable for use as a table top or interior material. There were constraints on color tone and design, and a solution was needed.

<Purpose of the invention> The present invention aims to provide a conductive decorative board that solves the above problems.

<Disclosure of the invention> The gist of the invention is as described above, and will be explained in detail below with reference to Examples.

Figure 1 shows α-cellulose printed paper printed with a wood grain pattern 2 with a weight of 70 g/m ² impregnated with 30 parts of ultrafine zinc oxide with a grain size of 0.1 μ or less mixed and dispersed in a melamine resin solution. The surface layer sheet 3 is immersed in resin and impregnated with melamine resin dispersed with zinc oxide at a weight ratio of 80% to the paper, and kraft paper with a basis weight of 120 g/m ² is impregnated with phenol resin at a weight ratio to the paper of 70%. Transparent conductive decorative board 1 obtained by laminating 42 retained core layer sheets and hot-pressing them using a hot press.
FIG. The conductive decorative board 1 had a surface resistance value of 6.1×10 ⁵ Ω and a volume resistivity of 8.7×10 ¹⁰ Ωcm. In addition, the wood grain pattern was clear.

Next, the raw materials used in the conductive decorative board of the present invention will be described.

Porous base materials include natural fibers such as α-cellulose fibers, craft fibers, and linter fibers; synthetic fibers such as nylon fibers, vinylon fibers, and acrylic fibers; inorganic fibers such as glass fibers and asbestos fibers; or mixtures of these various fibers. Paper, cloth, or base materials printed on these materials can be used. The porous base material is impregnated with a thermosetting resin composition containing white conductive particles to form a sheet for a decorative layer, which is stacked on a sheet for a core layer and molded to form a conductive decorative material. Ru. The thermosetting resin composition contains white conductive particles such as stannic oxide (SnO ₂ ), zinc oxide (ZnO), or Conductive particles formed by coating the white conductive particles on the surface of particles of silicon oxide, titanium oxide, etc. are added and mixed and dispersed, and the conductive particles have a ratio of 15 to 15 parts by weight to the retained component. Those added and dispersed at 20% or more are compliant. Generally, to solve the above conventional problems, the surface resistance value of the decorative board should be 10 ² to 10 ⁶ Ω or the volume resistance value should be 10 ⁵ to ^{10 10} Ω.
cm is appropriate and the addition rate of the conductive particles is 15 to 20
% or less, the resistance value cannot be obtained.

Normally, when a filler is mixed into a resin material, the filler impairs light transmittance and becomes opaque, but if the particle size is less than half the wavelength of visible light, the transmittance of visible light will not be impaired, so it is not considered. If the particle size of the white conductive particles is set to 0.1 μm or less, the surface of the porous substrate or the printed surface of the porous substrate will be exposed as is, and problems associated with the addition of fillers will be eliminated.

As the core layer sheet, a porous base material impregnated with a phenol resin as described above is used. Further, a metal sheet or the like may be laminated between the surface layer sheet and the core layer sheet.

<Effects of the invention> The conductive decorative board of the invention exhibits a white color instead of black or colored as in the past, so it is suitable as a surface material for table tops, interior decoration materials, etc., and can also be freely colored with retaining components. . In particular, if ultrafine white conductive particles of 0.1μ or less are used, the printed patterns and designs on paper, cloth, etc. can be maintained in the same way as conventional decorative materials, and the addition of these particles can improve transparency. There are no negative effects at all.

Of course, by having appropriate conductivity,
If this conductive decorative board is used on the floor of a work room or table top, the generated static electricity will be easily dissipated to the ground through the ground or metal objects, and will not be discharged as in the case of conventional methods, but will cause flammable gas and combustible Even if steam is present indoors, it will not cause a fire or explosion, making it very effective for disaster prevention.

In addition, when used as a workbench top for precision electronic parts, precision mechanical parts, etc., static electricity is not generated in the parts, so that the original functions of the assembled parts and assembled products will not be impaired or the quality will deteriorate.

Furthermore, if applied to a wall surface, radio wave shielding properties can be obtained, and problems that conventionally occurred in workplaces such as welter processing and high frequency processing can be solved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conductive decorative board 1 according to the present invention, and FIG. 2 is a diagram showing a state in which a surface layer sheet 3 is laminated on a core layer sheet 4. 1 ... Conductive decorative board, 2... Wood grain pattern, 3...
Sheet for surface layer, 4... Sheet for core layer.

Claims (1)

[Scope of utility model registration request] A sheet for a surface layer and a sheet for a core layer, each made by impregnating a porous base material such as paper or cloth with a thermosetting resin composition containing white conductive particles, are laminated and integrated. Characteristic conductive decorative board.