JPH0129078Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a table top, interior material ( The present invention relates to a conductive decorative board impregnated with a synthetic resin, which is used for materials such as flooring materials, wall materials, ceiling materials, etc.

In particular, there is a risk that the functions of the above-mentioned elements and equipment may deteriorate or be lost if static electricity is generated within the system, so workplaces where they are handled should, of course, store them in conductive containers and avoid handling them. The interior surfaces of all workplaces used must be conductive.

Generally, the electrostatic charge voltage of workers is 12,000 when walking on carpet during the dry winter season.
~39000V, when walking on vinyl tiles
4000~13000V, 500V when working while sitting on a chair
~3000V (both at relative humidity of 15~39% R, H), which is extremely high compared to the static electricity level of 100~2000V that destroys semiconductor devices.

Therefore, measures have been taken to cover the table top and floor, such as laying a synthetic resin mat mixed with a large amount of carbon black, or a synthetic resin sheet coated with metal or a metal compound.

However, in order to make synthetic resin conductive,
It is necessary to add a large amount of carbon black (more than 30%), and as a result, there are problems with moldability and a decrease in resin strength, and products coated with metal etc.
There is a disadvantage that permanent effects cannot be expected. and,
Products containing carbon black are generally black, which can cause eye fatigue for workers and affect work efficiency, so bright colors are desired.

This idea was created in view of the current situation,
At the time of papermaking, less than 20% carbon fiber (based on natural pulp fiber) is blended to create conductive paper that is uniformly dispersed and fixed within the paper structure. Other papers that do not contain fibers (e.g. pattern paper, core paper, balance paper,
The purpose of this paper is to create a resin decorative board in combination with other paper (hereinafter referred to as carbon fiber-free paper) to obtain conductive table tops, conductive interior materials, etc. suitable for various uses.

To explain an embodiment of the present invention, conductive carbon fiber 101 blended to form conductive paper 1
is a hydrophilic treated fiber with a diameter of 5 to 14μ and a fiber length of 4 to 4μ.
A diameter of about 12m/m is appropriate. Carbon fibers 101 are uniformly mixed with natural fibers during paper manufacturing. The blended carbon fibers contact each other to form a chain structure within the paper structure, forming a conductive path and exhibiting their own conductivity, and at the same time imparting conductivity to the paper to create a conductive paper 1. Configure. The amount of carbon fiber 101 blended is 20% or less, but even a small amount of about 5% exhibits a practically sufficient characteristic of surface resistivity of about 10 ² to 10 ³ Ω.

In the present invention, carbon fiber 101 is blended into all the papers that make up the conductive decorative board (for example, overlay paper, pattern paper, core paper, balance paper, and all other papers), making the entire decorative board conductive. (as shown in the third figure), or, if necessary, carbon fibers 101 may be blended with a specific paper to make a part of the decorative board conductive (as shown in the first figure, second figure, and other sandwich paper). structure, etc.). Therefore, what is important is to obtain a decorative board in which at least one surface, which is the front side, is made of conductive paper 1. The surface side refers to the indoor surface of the workplace.

Below, an example will be described in which a conductive paper 1 is used as only the overlay paper, and a carbon fiber-free paper 2 is combined with this to constitute a conductive decorative board with the conductive paper 1 arranged on one surface side.

Conductive paper 1 is NBKP95%, diameter 7μ, length 9m/
m carbon fiber 101 is blended at a ratio of 5%,
The paper used had an air permeability of 8 seconds, a paper thickness of 7 mils, and a weight of 105 g.

Next, patterned paper, core paper, and kraft paper were used as carbon fiber-free paper 2. Plain pattern paper containing 16% titanium oxide pigment was used, but it can be colored in various colors if necessary. It is also possible to use other gravure-printed patterned paper, but which one to use is selected depending on the relationship with the single-sided conductive paper 1. Additionally, three sheets of core paper with a thickness of 10 mils and 140 g/m ² were used. Further, on the side opposite to the conductive paper 1, kraft paper with a thickness of 10 mils and 140 g/m ² was used to prevent warping of the product.

The conductive paper 1 and the carbon fiber-free paper 2 are impregnated with synthetic resin. For the pattern paper of the conductive paper 1 and the non-containing paper 2, transparent melamine resin, benzoguanamine resin, diallyl phthalate resin, xylene resin, etc. are suitably used.
In this example, the above melamine resin was used. Examples of resins to be impregnated into the core paper include phenolic resin,
Xylene resin, diallyl phthalate resin, etc. are commonly used, but in this example, phenol resin was used. The kraft paper was impregnated with the above melamine resin. The amount of resin impregnated was about 65% for the conductive paper, and about 48 to 55% for the non-containing paper 2.

The above-mentioned series of conductive paper 1 and carbon fiber-free paper 2 undergo a resin impregnation and drying process in the same manner as the general resin decorative laminate manufacturing method, and are then hot-cold pressed through a stainless steel mirror plate using a high-pressure press. 1st
A product as shown was obtained. In addition, the thickness of the product is
It was 0.95m/m.

The conductive decorative board manufactured as described above has a surface resistance of 26×10 ² Ω on one side of the conductive paper side.
The volume resistivity is 3×10 ⁹ Ωcm, which exhibits sufficient characteristics for practical use. Therefore, by adhering this conductive decorative board to hardboard, particle board, etc., it is possible to create a material for a conductive table top, and this decorative board alone or in combination with other structural materials can be used to create a conductive table top material. It can be used as a conductive interior material (conductive flooring material, wall material, and ceiling material).

The present invention, as mentioned above, is suitable for natural pulp.
A conductive decorative board composed of a conductive paper containing carbon fiber of % or less, a paper containing no carbon fiber, or the above-mentioned conductive paper alone, wherein the above-mentioned conductive paper is arranged on at least one surface side. Therefore, as is clear from the above examples, it exhibits practically sufficient conductive properties. Therefore, if the decorative laminate is used alone or in combination with other structural materials to expose conductive paper on the indoor surface to construct materials such as table tops and interior materials,
Materials with conductive properties sufficient for practical use can be obtained, and ICs,
This has the effect of providing materials that can be effectively used in workplaces where semiconductor devices such as LSIs and related electronic equipment are handled, and where it is necessary to prevent the generation of static electricity. In contrast to well-known conductive mats, which have a black color due to a large amount of carbon black mixed into the resin, which causes serious eye fatigue for workers, this conductive decorative board By producing a variety of color tones, it has the effect of contributing to improving the working environment.

Therefore, the intended purpose can be achieved.

[Brief explanation of drawings]

Fig. 1 is a partially enlarged perspective view of a first example in which a part of the decorative board of the present invention is configured to be conductive, Fig. 2 is a partially enlarged perspective view showing a second example of the structure, and Fig. 3 is the entire structure. FIG. 2 is a partially enlarged perspective view of a decorative board made of electrically conductive material. In the figure, 1 is conductive paper, 101 is carbon fiber,
2 is paper that does not contain carbon fiber (carbon fiber-free paper).

Claims (1)

[Scope of utility model registration request] Conductive paper containing 20% or less of carbon fiber to 5% of natural pulp fiber and impregnated with thermosetting synthetic resin, and conductive paper impregnated with thermosetting synthetic resin without carbon fiber being blended. An electrically conductive decorative board comprising at least the electrically conductive paper arranged on one surface, or the electrically conductive paper alone.