JPH0684066B2 - Method for manufacturing decorative board having conductivity - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention has a function of preventing discharge caused by generation of static electricity and adhesion of dust, dust, etc. And it is about the method of surely obtaining.

[Prior Art] As a surface material for interiors of various structures, workbench, furniture, etc., a decorative plate using a so-called synthetic resin decorative sheet is widely used.

By the way, static electricity is easily generated in a decorative plate using the synthetic resin decorative sheet, which may cause deterioration or loss of the function of the electronic component in a system handling precision electronic components, or a large amount. In an environment that handles solvents,
Even the problem of a fire starting from the discharge of charged static electricity can arise.

For this reason, it has been proposed that a decorative sheet using carbon paper mixed with paper as a decorative sheet for a decorative sheet provides conductivity to the decorative sheet itself (Shokai 58-38438). (See Japanese Patent Publication No.), the device is designed to have antistatic performance.

[Problems to be Solved by the Invention] However, in the decorative board using the decorative sheet made of the carbon fiber-mixed paper, the carbon fibers are continuously entangled in obtaining the carbon fiber-mixed paper used as the decorative sheet. Is difficult to achieve, and it is difficult to provide complete conductivity, and a large amount of carbon fibers must be mixed because carbon fibers are dispersed throughout the paper layer that makes up the decorative sheet. Since the outermost surface layer of the decorative sheet is composed of a non-conductive resin layer, the surface resistance of the decorative sheet increases, and the carbon fiber mixed paper used as a decorative sheet Since it is black, it has a defect that the design effect due to the color cannot be exhibited.

On the other hand, the present invention can provide a method for obtaining a decorative board having sufficient conductivity without the need for adding a special step as compared with the manufacturing steps in the conventional method for manufacturing a decorative board. It is also possible to provide a method for manufacturing a decorative board having characteristics such that the design effect due to color can be freely expressed by appropriately selecting the conductive substance to be contained in the paint. Is.

[Means for Solving Problems] The present invention provides a method for manufacturing a decorative board, which comprises a base material for a decorative board such as plywood or particle board used for general decorative boards, which is impregnated with a thermosetting resin or A step of placing a coated cosmetic sheet having a pattern of a printed pattern on a base material for a decorative plate, and containing a conductive material of antimony oxide-doped tin oxide fine powder having a particle size of 0.1 μ or less A releasable sheet having a coating layer made of a transparent or semi-transparent coating material on the releasable surface is placed so that the coating layer in the releasable sheet is in contact with the above-mentioned makeup sheet to form a stack. The step of obtaining, the step of heating and press-molding the stack obtained in the previous step, and the step of integrally thermo-compressing, and peeling the peelable sheet from the obtained thermo-compressed article, the conductive material is formed on the surface. To obtain a decorative board having a coating layer containing Made of a process, a method of obtaining a decorative plate having a conductivity comprising decorative plate is composed of a coating layer having a surface containing a conductive substance.

In the method for producing a conductive decorative board of the present invention comprising the above method, as the decorative board substrate, for example, plywood,
In addition to wood-based materials such as particle board, hard board, and insulation board, pulp-based materials, paper-based materials such as resin-impregnated paper, polyvinyl chloride, polystyrene, acrylic polymers, and synthetic resin-based materials such as phenolic resins. Inorganic base materials such as wood, rock wool, glass wool, wood chip cement board, wood wool cement board, pulp cement board, asbestos calcareous board, perlite board, and metal base materials such as aluminum board and steel board are used.

As a base material in a cosmetic sheet impregnated or coated with a thermosetting resin, for example, a paper sheet (basis weight 23 to 14
(About 0 g) or a non-woven fabric is used, but a TiO ₂ mixed paper having a porous paper-like structure with an air permeability of about 0 to 30 seconds is preferable in that the hiding performance and the synthetic resin impregnation performance are good, and , In some cases, gravure printing, offset printing,
Those having a printing pattern by a printing means such as letterpress printing or silk printing can be used as well.

As the thermosetting resin to be impregnated or coated on the decorative sheet base material, for example, melamine resin, diallyl phthalate resin, unsaturated polyester resin, benzoguanamine resin, phenol resin, etc. are suitable, and vertical type, horizontal type Or a coating device such as a gravure roll coater, a Meyer bar roll coater, a doctor blade coater, a reverse coater, a dip coater or an air knife coater.

Further, as the peelable sheet, a sheet that can withstand the heating and pressurizing conditions in the thermocompression integral molding carried out by the method for manufacturing a decorative sheet of the present invention, and one that has excellent release performance is preferable, For example, polyester film, polypropylene film, polyethylene film, polystyrene film, polyvinylidene chloride film, fluororesin film,
Various synthetic resin films such as polycarbonate film and polyamide film, sheets of paper, etc., or laminated sheets having a release resin layer provided on the surface of these sheets are used.

As a vehicle in a coating material containing a conductive substance applied to the releasable surface of the releasable sheet, for example, commonly used materials such as nitrification cotton, cellulose acetate, polyvinyl chloride, acrylic resin, butyral resin, polyvinyl alcohol, etc. Thermosetting resins such as thermoplastic resins, melamine resins, polyester resins, diallyl phthalate resins and benzoguanamine resins, and further polyol components such as vinyl chloride polyols, acrylic polyols, polyester polyols and tolylene diisocyanate, methylene diisocyanate, hexamethylene diisocyanate Polyurethane resin consisting of diisocyanate component such as xylene diisocyanate, for example, alkyd resin component such as glyptal resin and amino resin component such as urea resin or melamine resin, and paratoluene sulfonic acid or the like. A two-component curing type resin such as an acid-curing aminoalkyd resin to which a catalyst is added, a polyamine component such as polyamide, ethylenediamine and diethylenetriamine, or an epoxy resin comprising a polybasic acid such as phthalic anhydride and an epoxy resin component, or these A resin obtained by converting a two-component curing type resin into a block polymer is used, but from the viewpoint of the physical properties of the conductive layer in the decorative plate obtained by the method of the present invention, a thermosetting resin or a two-component curing type resin is used. Resins are preferred. As the conductive substance contained in the paint using these vehicles, for example,
In addition to metal powders and flakes such as carbon, nickel, chromium, silver, copper, graphite, tin and aluminum, fine powders of metal oxides such as tin, nickel, titanium, indium and antimony are used. Tin oxide fine powder doped with antimony (particle size 1 μm or less) is preferable. Further, from the viewpoint of fluidity of the obtained coating material, fine powder of 0.3 μm or less, preferably 0.1 μm or less is suitable. Further, generally, a coating material containing the conductive substance in an amount of about 30 to 70% by weight is used. In particular, the coating layer made of the coating material containing the conductive substance is transparent or semitransparent. In this case, a paint containing about 20 to 70% by weight of fine powder of metal oxide of 0.1 μ or less is used.

However, the coating material containing the conductive substance is a vehicle and a conductive substance as an essential constituent component, in order to impart the hiding performance to the coating material, various coloring pigments such as TiO ₂ It may be added within the range of up to 30% by weight.

The paint can be used as a solvent type or an aqueous emulsion type using a solvent such as an alcohol type, an ester type, an aromatic type, or a ketone type. For example, a gravure roll coat, a Meyer bar roll coat, a doctor blade, etc. It is applied to the releasable surface of the releasable sheet by a coating method such as coating, reverse coating, dip coating, and air knife coating. Further, the coating layer of the above-mentioned paint formed on the releasable surface of the releasable sheet may be formed so as to cover the entire releasable surface, or the edge of the releasable sheet may be formed. It may be a partial coating layer having a pattern continuous up to the part.

A stack of a decorative sheet base material, a cosmetic sheet impregnated with or coated with a thermosetting resin, and a peelable sheet having a release layer having a coating layer made of a coating material containing a conductive substance. The molding conditions for heat-pressure integral molding are general molding according to the type of thermosetting resin adhering to the cosmetic sheet and the type of vehicle in the coating layer with a coating material containing a conductive substance. The condition is what is used.

[Examples] Hereinafter, specific configurations of the method for producing a decorative decorative sheet of the present invention will be described with reference to Examples.

Example 1 A floral pattern was printed on a surface of titanium paper having a basis weight of 80 g / m ² using a cellulose acetate-based ink with a gravure printing four-color machine, and then a diallyl phthalate resin composition having the following composition was applied. A cosmetic sheet made of resin-impregnated paper having a resin adhesion amount of 80 g / m ² was obtained by impregnation.

Diallyl phthalate resin composition (1) Daiso Dup 94 parts by weight (2) Daiso Dup monomer 4 parts by weight (3) BPO 3 parts by weight (4) Acetone 75 parts by weight (5) Toluene 25 parts by weight On the other hand, 25 μm thick polyester Film [Lumirror T60:
Toray Co., Ltd.] A transparent coating material [SM] containing 30% by weight of tin oxide fine powder (particle size 0.1 μ or less) doped with antimony oxide as a vehicle on the entire surface on one side. Clear: Showa Ink Co., Ltd.] is applied to a thickness of about 1 μm by a roll coater method, and a coating layer made of a coating material containing a conductive substance is formed on the releasable surface. Got

Then, on the base material for a decorative plate consisting of plywood with a thickness of 2.7 mm,
A cosmetic sheet made of the paper impregnated with the diallyl phthalate resin is placed so that the printed pattern surface of the sheet is the surface, and the coating layer made of the paint containing the conductive material is also released. The peelable sheet formed on the adhesive surface is placed on the cosmetic sheet so that the coating layer of the sheet and the cosmetic sheet are in contact with each other to obtain a stack, and then the stack is Degree, 10 minutes, 10Kg / cm ²
Was heated and pressure molded.

When the uppermost polyester film was peeled off from the obtained heat and pressure molded product, a decorative plate having a urethane resin layer whose surface contained a conductive substance was obtained.

The surface resistance value of the decorative plate thus obtained is 10 ⁵ to 10 ⁶ Ω
It was / cm and had sufficient antistatic performance. In addition, it was possible to obtain a highly decorative design in which the floral print pattern on the surface of the cosmetic sheet can be viewed without being blocked by the urethane resin layer present on the surface.

[Operation and Effect of the Invention] In the method for producing a decorative decorative sheet of the present invention, the decorative sheet impregnated with or coated with a thermosetting resin and the coating layer made of a coating material containing a conductive substance are separated from each other. After obtaining a thermocompression-molded body of a stack in which a peelable sheet formed on the moldability surface is placed on a decorative board substrate, by peeling the peelable sheet from the thermocompression-molded body, (EN) A decorative board having a coating layer containing a conductive substance on its surface, which has sufficient conductivity without adding a special step as compared with the steps in the conventional method for manufacturing a decorative board. Veneer
The function and effect of being easily and surely obtained are obtained.

In addition, the method for producing a decorative board having conductivity of the present invention is that, by appropriately selecting the conductive substance in the coating material containing the conductive substance, the design effect due to color can be freely exhibited. In addition, the decorative plate having both the conductivity and the design effect due to the color can be easily obtained.

Claims (2)

[Claims] 1. A step of placing a decorative sheet impregnated or coated with a thermosetting resin and having a pattern of a printed pattern on a base material for a decorative plate, and a particle size of 0.1 μm or less doped with antimony oxide. Of the tin oxide fine powder, the peelable sheet having a coating layer made of a transparent or translucent layer containing a conductive substance is formed on the releasable surface. A step of placing the coating layer of the sheet so that the cosmetic sheet is in contact with the sheet to obtain a stack; a step of integrally thermoforming the stack obtained in the previous step; And a step of obtaining a decorative sheet having a coating layer containing a conductive substance on the surface by peeling off the release sheet from the sheet. 2. The method for producing a decorative board having conductivity according to claim 1, wherein the coating layer made of a coating material containing a conductive substance is a coating layer containing a thermosetting resin. .