JP2892846B2 - Wiring material for electrostatic ground - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiring member used for grounding static electricity of various devices and members.

[0002]

2. Description of the Related Art Conventionally, various types of electric equipment and printed circuit boards often generate static electricity, which may cause malfunctions of the equipment. For this reason, electrical equipment, printed circuit boards and the like are usually provided with wiring for grounding in order to release generated static electricity (for grounding).

As the ground wiring, in addition to a normal electric circuit, a method of providing a circuit for connecting a printed circuit board to the outside world (ground), or a method of separately connecting a conductor is adopted. I was

[0004]

However, when wiring for grounding static electricity is performed as described above, the wiring work is troublesome depending on the equipment or substrate to be wired, and the strength is not sufficient. There is a problem that breakage or disconnection is likely to occur during use without any trouble.

For example, when a member for grounding is a three-dimensional substrate having a complicated shape, there is a problem that it is not easy to form a wiring pattern for discharging static electricity on the substrate. In the case where the wiring is bent many times, there is a problem that the wiring is disconnected at the bent portion.

In addition, when a conductor is used separately, the work of connecting the conductor with solder is troublesome, and there is a problem that the conductor is removed during use. SUMMARY OF THE INVENTION An object of the present invention is to provide a wiring member for electrostatic grounding that is easy to wire and has sufficient strength.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to a wiring material used for electrostatic grounding of equipment or members, and comprises a gas phase method by thermal decomposition of hydrocarbons. And / or a high melting point metal and / or
Or, a carbon fiber grown as an ultra-fine powder of the compound of the metal as a growth start part, mixed with a material having a lower conductivity than the carbon fiber to form a paste, and the paste is dried after adhering to the device or member. Electric resistivity 10 ³ -10 ¹⁰ Ωcm
The gist of the present invention is a wiring member for electrostatic grounding, characterized in that it is used as the wiring member.

Here, the carbon fiber is formed as a whisker-like material having a small diameter substantially equal to the diameter of the ultrafine powder of the high melting point metal and / or its compound, unlike the polyacrylonitrile-based carbon fiber or the pitch-based carbon fiber. It was done.

The refractory metal used in the present invention is a metal that does not vaporize at a temperature of 950 to 1300 ° C., which is the temperature of thermal decomposition of carbon and hydrogen, and is the fourth metal in the periodic table such as Ti and Zr.
a group, 5a group such as V and Nb, 6a group such as Cr and Mo
Group, elements of group 7a such as Mn, and elements of group 8 such as Fe and Co are particularly preferable. Fe, Co, Ni, V, N
b, Ta, Ti, and Zr. Such metal compounds include oxides, nitrides, and other salts.

Examples of the member having lower conductivity than carbon fiber include nylon, polyvinyl chloride, etc., and various binders (eg, resin such as epoxy, phenol, acrylic, polyester, alkyd, urethane, silicon, etc.). Synthetic rubber) can be used. In order to form the paste, for example, an alcohol-based solvent or the like can be used.

The amount of carbon fiber used is preferably about 30 to 40% by volume in the paste state, and about 20 to 30% by volume in the dry state. It has sufficient strength. Furthermore,
The electric resistivity is preferably 10 ⁵ to 10 ⁸ Ω.
・ It is cm.

[0012]

According to the wiring member for electrostatic earthing of the present invention, a paste formed by mixing carbon fiber and a material having lower conductivity than carbon fiber is formed on the surface of the member by printing or coating, and then dried. Things.

In other words, in the present invention, a paste containing carbon fibers is formed on the surface of various devices and members in order to perform grounding. It can be formed.

Further, since this wiring material contains carbon fiber, it has mechanical strength, and when wiring is formed in a bent portion, for example, the possibility of breakage or disconnection is reduced. Further, since the carbon fiber is in the form of a whisker having a small diameter, the carbon fiber is excellent in adhesion and dispersibility with the material (base material) to be mixed. As a result, the carbon fiber spreads over all parts of the base material and is uniformly dispersed and maintained, so that high strength is maintained over the entire wiring.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a wiring member 1 for electrostatic ground according to a first embodiment to which the present invention is applied is made of a synthetic resin (for example, ABS).
It is arranged on the surface of the three-dimensional substrate 2 made of resin. That is, the wiring member 1 for electrostatic grounding is formed so as to be bent along the surface of the three-dimensional stepped three-dimensional substrate 2, and one end thereof is grounded.

The wiring member 1 for electrostatic grounding is made of, for example, a mixture of carbon fibers in a matrix epoxy resin or the like at a predetermined ratio as described below. And used in the form of a highly viscous paste.

Next, a method of manufacturing the wiring member 1 for electrostatic grounding and a method of forming a wiring using the wiring member 1 for electrostatic grounding will be described. First, in a furnace at 950 to 1300 ° C., a particle size of 0.0 was obtained by a gas phase method of thermally decomposing benzene.
Using iron powder of 2 μm to 0.03 μm as a growth initiator, carbon fibers 6 having a diameter of 0.1 μm to 0.5 μm and a length of 0.1 to 1 mm are grown.

The carbon fiber thus formed has the following physical properties. Tensile strength: 200 kg / cm ² Elastic modulus: 20 t / mm ² Electric resistivity: 0.001 Ω · cm On the other hand, as a binder of the base material, a material having lower conductivity than carbon fiber, such as epoxy resin, is used.

Then, a solvent or the like is added to the epoxy resin and the carbon fiber to adjust the viscosity, thereby producing a wiring material paste. The binder, the carbon fiber and the solvent are used at a ratio of, for example, 20 to 60% by weight of the total amount of the binder, 70 to 10% by weight of the total amount of the carbon fiber, and 10 to 30% by weight of the total amount of the solvent. It is desirable.

That is, by mixing the above components at such a ratio, it is possible to produce a wiring material paste having high adhesiveness and an appropriate electric resistivity for electrostatic grounding.

Next, wiring is formed on the surface of the three-dimensional substrate 2 by a method such as thick film printing or coating using the wiring material paste manufactured by the above method. After that, the wiring material paste on the three-dimensional substrate 2 is dried to obtain 10 ³ to 10 ¹⁰ Ω · c.
Complete a ground wire with an electrical resistivity in the range of m.

As described above, by performing wiring using the wiring member 1 for electrostatic ground of the present embodiment, the following effects can be obtained. That is, the wiring member 1 for electrostatic grounding of the present embodiment
The paste of the synthetic resin containing carbon fiber is applied to the three-dimensional substrate 2
Since it is only necessary to form the three-dimensional substrate 2 by printing or coating, even if the shape of the three-dimensional substrate 2 is complicated, it is extremely easy to form wiring for electrostatic grounding. Also, since the mechanical strength of the carbon fiber is high, the formed wiring is less likely to break or break,
There is an advantage that durability is high.

Next, a second embodiment will be described. As shown in FIG. 2, the present embodiment differs from the first embodiment in the object to use the wiring member 3 for electrostatic grounding.

That is, the electrostatic ground wiring member 3 of this embodiment is used for the bent portion 5 of the member 4.
It is wired so as to intersect the bent portion 5 vertically. The other composition and the manufacturing method are the same as those in the first embodiment, and the description is omitted.

As described above, in this embodiment, the electrostatic grounding wiring member 3 is used in the bent portion 5, but the electrostatic grounding wiring member 3 is mixed with carbon fiber, so that the mechanical strength is reduced. There is, therefore, an effect that the wire is not broken even if it is bent many times.

The embodiments of the present invention have been described above.
The present invention is not limited to such embodiments at all, and it goes without saying that the present invention can be implemented in various modes without departing from the gist of the present invention.

[0027]

As described in detail above, the present invention is a wiring material for electrostatic grounding, in which wiring is formed by using a paste containing carbon fiber, so that it can be easily applied to complicated devices and members. A certain electrostatic ground wire can be formed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a three-dimensional substrate using a wiring member for electrostatic grounding of a first embodiment.

FIG. 2 is a perspective view showing a member using a wiring member for electrostatic grounding of a second embodiment.

[Explanation of symbols]

 1,3 ... wiring material for electrostatic ground 2 ... three-dimensional board 4 ... members

Claims (1)

(57) [Claims] 1. A wiring material used for grounding static electricity of equipment or members, which is produced by a gas phase method by pyrolysis of hydrocarbons, and which has a high melting point metal and / or a compound of the metal. A carbon fiber grown with the powder as a growth start part is mixed with a material having lower conductivity than the carbon fiber to form a paste, and the paste is dried after being attached to the above-mentioned device or member, and has an electrical resistivity of 10 ³ to 10 ¹⁰ Wiring material for electrostatic ground, characterized by Ω · cm wiring material.