JPH0231030Y2 - - Google Patents

Description

[Detailed description of the invention] This invention can effectively prevent static electricity.
The present invention relates to a conductive mat that is suitably used as a mat on a table for handling ICs or parts incorporating ICs, a mat for floor surfaces, a mat for protecting walls, etc.

ICs and parts incorporating ICs must be handled with care and must be protected from static electricity, as static electricity can destroy the IC. For this reason, rubber or plastic sheets that have been made conductive by dispersing conductive powder have been used, but there is a demand for conductive mats that are even more effective in preventing static electricity. In addition, conventional sheets with conductive powder dispersed mainly use carbon black powder as the conductive powder, so the sheets are black and unsightly, so they are not suitable for use in offices, hotels, etc. Not. Further, even when used in a workplace etc., black color is not suitable for environmental hygiene.

The present invention was devised in view of the above circumstances, and an object of the present invention is to provide a conductive mat that has a high antistatic effect and can be colored in various colors.

That is, in order to achieve the above object, the present invention forms a paint layer containing 5 to 30% by weight of carbon fibers dispersed on a conductive sheet through a non-conductive adhesive layer with a thickness of 2 to 20 μm. This is what I did.

The conductive mat of the present invention can be particularly colored in various colors and is intended for use in offices, hotels, etc., and for this purpose, a paint layer is formed on the conductive sheet, and In order to impart conductivity to the paint layer and enable desired coloring, 5 to 30 carbon fibers are added to the paint layer.
% by weight, and to ensure adhesion between the paint layer and the conductive sheet, as well as to transfer electric charge from the paint layer to the conductive sheet due to a tunnel effect. It is interposed with a thickness of ~20 μm.

According to the conductive mat of the present invention, the paint layer containing carbon fibers dispersed in an amount of 5 to 30% by weight,
While the conductivity in the surface direction is very low, the conductivity in the thickness direction is high, so even if charges move from a charged object such as a human body to this paint layer, the charges will flow in the thickness direction, and further Since the paint layer passes through the non-conductive adhesive layer formed to a thickness of 2 to 20 μm and flows to the conductive sheet by a tunnel effect, the paint layer is not charged. Therefore, the conductive mat of the present invention has extremely high antistatic ability, and is therefore suitable for use as a mat for placing on a table that handles ICs or components incorporating ICs, a mat for floor surfaces, a mat for protecting walls, etc. It is something that can be done. In addition, since the paint layer is formed on a conductive sheet via an adhesive layer, it has good adhesion and there is little risk of peeling off during use. %, and since the amount of carbon fiber is not large, it is possible to color the desired color by adding an appropriate pigment, and it is also possible to form patterns, making it suitable for offices, hotels, etc. It is very stylish even when used at home to prevent static electricity.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. The conductive mat 1 according to the embodiment shown in FIG. A paint layer 4 containing dispersed components is formed.

Here, the conductive sheet 2 may be a conductive rubber or plastic sheet in which conductive powder such as carbon black powder is dispersed and mixed, a metal sheet such as aluminum, or at least the surface of the rubber or plastic sheet on the non-conductive thin layer 3 side. An electrically conductive film (preferably 10 ⁶ Ω - cm or less) can be used. The thickness of the conductive sheet 2 is not particularly limited, and is appropriately selected depending on the purpose of use.

The non-conductive adhesive layer 3 ensures adhesion between the conductive sheet 2 and the paint layer 4 and provides a tunnel effect, and is made of rubber, acrylic, urethane, epoxy, etc. adhesive. The thickness is 2 to 20 μm, and if it is too thick, the tunnel effect will not be exhibited.

Furthermore, the paint layer 4 has carbon fibers dispersed therein, and in this case, the content of carbon fibers is set to 50% of the entire paint layer 4 from the viewpoint of the conductivity of the paint layer 4 and the ability to color the paint layer 4 in a desired color. ~30% by weight, and the thickness direction of the paint layer is 10 ² Ω・cm or less,
It is preferable that the surface direction is 10 ¹⁰ Ω·cm or more. Also, the length of the carbon fiber is
The thickness is preferably 0.01 to 1 mm. Note that there are no particular restrictions on the paint with which this carbon fiber is mixed, and for example, epoxy resin paint, urethane resin paint, acrylic resin paint, polyester resin paint, etc. are used. In this case, the paint can be colored in a desired color by adding pigments. The thickness of this paint layer 4 is not particularly limited;
It is preferable to set the thickness to 100 μm.

Furthermore, the obtained conductive mat 1 has a surface resistivity of 10 ¹ to 10 ⁸ Ω·cm, particularly 10 ⁴ to 10 ⁶ Ω·cm.
It is desirable that

The above-mentioned conductive mat 1 is used with its paint layer 4 on the front side, and in this case, the conductive sheet 2 on the back side can be grounded.

This conductive mat 1 is designed so that even if an electric charge is transferred to the paint layer 4 from a charged object such as a human body, the paint layer 4
Since carbon fibers are dispersed in the paint layer 4, the conductivity in the surface direction of the paint layer 4 is low and the conductivity in the thickness direction is high, so that electricity flows through the paint layer 4 in the thickness direction.

That is, Figure 2 shows the relationship between the film thickness of the paint layer in which carbon fibers are dispersed, the surface resistance value A, and the thickness direction resistance value B. In this case, a urethane resin paint is used as the paint, and this length during paint
This is an experimental value when 0.1 mm carbon fiber was dispersed at 20% by weight of the entire paint.

Therefore, as is clear from FIG. 2, electricity can easily flow through the paint layer 4 in which carbon fibers are dispersed along its thickness. The electricity flowing through the paint layer 4 along its thickness passes through the non-conductive adhesive layer 3 due to the tunnel effect.
It flows to the conductive sheet 2. Therefore, static electricity is not stored in the paint layer 4, and charging is prevented.

Moreover, the paint layer 4 serving as the surface layer of the conductive mat 1 can be freely colored and patterns can be formed, so that it can be used with good appearance.

As explained above, the conductive pine of the present invention has a very high antistatic effect, can be colored freely, has good health, and can be effectively used for various purposes.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure is a graph showing the relationship between the thickness of the paint layer in which carbon fibers are dispersed, the surface resistance value, and the resistance value in the thickness direction. 1... Conductive mat, 2... Conductive sheet, 3
...Non-conductive adhesive layer, 4...Paint layer.

Claims (1)

[Scope of utility model registration request] 1. A conductive mat comprising a paint layer containing carbon fibers dispersed in an amount of 5 to 30% by weight, formed on a conductive sheet via a nonconductive adhesive layer with a thickness of 2 to 20 μm.