JPS62225343A - Manufacture of resin impregnated sheet for conductive decorative board - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for producing a resin-impregnated sheet for conductive decorative laminates having excellent electrical conductivity.

[Problems to be solved by conventional technology and invention]

Conventionally, two types of resin-impregnated sheets for conductive decorative boards have been developed.

One of them uses conductive mixed paper with carbon fibers and metal fibers incorporated into the valve as an impregnated base material, and this conductive mixed paper can be printed or used as is.
This is a method of making an impregnated sheet by applying or impregnating a thermosetting resin such as diallyl phthalate resin to which a curing agent, an internal mold release agent, a filler, a solvent, etc. or a conductive filler is added as necessary, and drying.

In this method, not only is the conductive mixed paper very expensive, but the carbon fibers and metal fibers incorporated to give conductivity appear on the surface of the decorative board, making the design of the decorative board very difficult. There are some disadvantages.

The other method is to use a sheet-like material such as paper or cloth as a base material, and generally, ditan printing paper is used.

This uses powdered silver, copper, nickel, etc. to provide conductivity.
Various conductive fillers such as stainless steel, zinc oxide, tin oxide, aluminum ribbon, carbon fiber, and metallized glass are added to the impregnated resin.

When creating a clean room with a decorative board made by this method, in order to ensure a surface resistivity of about 1G"-10'Ω, which is acceptable for use, the amount of conductive filler added should be 10 to 30% relative to the amount of impregnated resin attached. % or more must be mixed.

Since the conductive filler is mostly opaque, if it is added in a large amount, it will be difficult to clearly represent the color pattern of the printed paper, resulting in uneven covering, and the design of the decorative board will be lost.

For this reason, efforts have been made to develop conductive fillers with good transparency, but the results have not yet been recognized.

Furthermore, there have been proposals to combine the above two methods, and to make the color unevenness of the conductive filler less noticeable, using printed paper with the same color or pattern as the conductive filler as a base material. However, it has the disadvantage that the colors and patterns are limited, and when compared with the conventional decorative board based on decorative titanium paper, it has the disadvantage that it is greatly inferior in terms of practicality in terms of cosmetic properties.

[Means for solving problems]

The present invention solves the above-mentioned drawbacks, and has a design comparable to that of a conventional decorative board using a decorative titanium paper base material, and has a surface resistivity of about 106 to 1011 Ω, which is required for interior materials for clean rooms, etc. The present invention provides a method for manufacturing a resin-impregnated sheet for conductive decorative laminates having the following performance.

The present invention will be explained below.

The method is characterized in that a fibrous conductive filler is mixed into the printing ink of the printing paper serving as the resin-impregnated base material and into the impregnating resin.

Further, a fibrous tin oxide-based conductive filler may be used as the fibrous conductive filler.

Furthermore, diallyl phthalate resin, unsaturated polyester resin, melamine resin, benzoguanamine resin, etc., or modified thermosetting resins thereof may be used as the impregnating resin.

Further, it may be mixed in the printing ink of the printing paper at 2 to 6 g/x", and in the impregnating resin at 0.1 to 1 g/*".

[Effect]

In the present invention, the fibrous conductive filler is not simply mixed into the impregnated resin, but is also mixed as a component of the printing ink, and processed into a decorative board in order to adjust the color of the printing ink. However, the color tone of the printed paper is reproduced as is.

In addition, since printing uses a gravure printing roll with a constant plate depth, the amount of ink adhesion, that is, the adhesion and agitation of the conductive agent, is uniform.
Consistent conductive performance can be obtained over the entire surface.

Generally, in solid printing on decorative titanium paper, 7 to 20 g/x'' of ink is printed in two to three prints, taking into account the hiding effect of the printing paper, the permeability of the impregnated resin liquid, etc. The conductive printing paper of the invention preferably contains 2 to 697x' of fibrous tin oxide conductive filler.

If it is less than 2 g/l, sufficient conductivity cannot be obtained;
If it is more than x'', the ink will become cloudy, and depending on the color tone, the design will be poor, making it unsuitable for printing paper for decorative boards.

A coating amount of 3.5 to 4.5 y/x" is desirable.

As for the printing method, if a specified amount of conductive filler is printed, the more times of printing, the less noticeable the ink swimming and drop-outs during printing, the better the design, and the more uniform conductive performance can be obtained.

Next, as the impregnating resin, diallyl phthalate resin, unsaturated polyester resin, melamine resin, benzoguanamine resin, etc. are used as the base resin.

A curing agent, an internal mold release agent, a polymerization inhibitor, a filler, a solvent, etc. are added to this as necessary to obtain an impregnated resin liquid.

In the present invention, a fibrous, tin oxide-based conductive filler is impregnated into the impregnated resin liquid (solid content) in an amount of 0.1 to 1 L.
The number of parts to be blended is determined so that it contains 0g7m''.

If the amount of conductive filler impregnated is OAg/x" or less, the surface resistivity is 10" to 108Ω, which is desirable as a conductive decorative board.
cannot be stably obtained, and if it exceeds 1.09/+y', the transparency of the resin is lost and the color tone of the printed paper cannot be clearly reproduced.

Desirably, the content of this conductive filler is 0.2 to 0.
5y/x".

Resin-impregnated paper is produced by impregnating or coating conductive printing paper with the resin liquid prepared in this manner by a conventional method.

The present invention uses a limited conductive filler in a limited nail,
By containing it in the printing ink and impregnating resin, impregnated paper for conductive decorative laminates with a design comparable to that of general decorative laminates can be manufactured.

〔Example〕

Eye poly-toned gravure ink with solid content ratio of 30%
tin oxide-based conductive filler (composition: 5nOt・S b
,o,,Shape: fibrous powder, length 1-2μ, diameter 0.3
~0.6μ), adjusted the viscosity with thinner to 25 seconds (Ford Cup #4), and prepared white titanium paper KW- with a base paper weight of 80g/z” on a solid plate with a board bed of 50μ.
Printed twice on 801p (manufactured by Koshiiri).

The adhesion amount of ink containing conductive filler is 15g/x
! Met.

50 parts of diallyl phthalate prepolymer (hereinafter simply referred to as "parts") 71 parts of ortho-unsaturated polyester (solid content 70% toluene solution) 3 parts of benzoyl peroxide, 0.4 parts of internal mold release agent, 1 part of polymerization inhibitor (hydroquinone) ) 0.0
2 parts, 5 parts filler (silicon dioxide).

Fibrous/tin oxide conductive filler (SnOs/5b
150 parts of acetone was added to 0.4 parts of zo*) and sufficiently stirred to dissolve it, thereby preparing an impregnated resin liquid.

The previously prepared conductive printing paper was impregnated into this resin liquid so that the resin adhesion amount was 90 g/x'', and dried by passing it through a hot air dryer at 80 to 120°C for 1 minute. An impregnated sheet for conductive decorative board was prepared.

This impregnated sheet was placed on the surface of a 5 Jl/R thick asbestos cement board (Asbeston manufactured by Asahi Asbestos Industries Co., Ltd.) that had been treated with a sealer (“Alkalinura MDFJ” manufactured by Chugoku Paint Co., Ltd.), and then the matte-finished duralumin Temperature: 140'C Pressure: 15&9/z' with plate as backing plate.

A thermosetting resin decorative board was obtained by hot-pressing molding for 8 minutes.

The surface resistivity of this decorative board is SK-69115,13
An electrically conductive decorative board having a surface resistivity of 1.5×10 7 Ω was obtained as measured by .

In addition, this decorative board has an appearance with no difference in design from general diallyl phthalate resin decorative boards, and also has surface properties comparable to general noaryl phthalate resin decorative boards.
Passed the FW type of "Japanese Agricultural Standards for Special Plywood".

[Effects of the Invention] The present invention uses a fibrous conductive filler, and does not mix the fibrous conductive filler only with the resin that impregnates the base material, but mixes it into the printing ink of the printing paper that serves as the base material. Since it is mixed with the resin-impregnated sheet for conductive decorative laminates, it becomes a resin-impregnated sheet for conductive decorative laminates that has extremely good conductivity, and also does not cause poor color tone of the printed paper. .

March 27, 1986 Applicant: Arisawa Seisakusho Co., Ltd. Inventor Chika Fuji - Male

Claims (1)

[Claims] 1. Production of a resin-impregnated sheet for a conductive decorative board, characterized in that a fibrous conductive filler is mixed into the printing ink of printing paper serving as a resin-impregnated base material and the impregnated resin. Law. 2. A method for producing a resin-impregnated sheet for a conductive decorative board according to claim 1, wherein a fibrous tin oxide conductive filler is used as the fibrous conductive filler. 3. The method for producing a resin-impregnated sheet for conductive decorative laminates according to claim 1, wherein a diallyl phthalate resin, an unsaturated polyester resin, a melamine resin, a benzoguanamine resin, or a modified thermosetting resin thereof is used as the impregnating resin. 4. Production of a resin-impregnated sheet for a conductive decorative board according to claim 1, in which 2 to 6 g/m^2 is mixed in the printing ink of the printing paper and 0.1 to 1 g/m^2 is mixed in the impregnated resin. Law.