JP2000323265A - Conductive heat generating paint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide conductive heat generating paint excellent in conductivity and storage stability, being friendly to environment and economical, and providing better heat generating effect by mixing fine powder of conductive carbon allotrope with organic natural polymer binder including water. SOLUTION: Graphite powder appropriate to the coating area is put in a vessel, gradually mixed with binder including water, and stirred for about ten minutes by a rod-shaped material so that conductive heat generating coating material is prepared. Electrodes 3 are formed on both sides of a surface of a board 1, for example, the thickness 8 mm, the width 400 mm, and the length 400 mm and the conductive heat generating coating material is applied thereon by brush coating to be naturally dried. The thickness of the paint film 2 of the conductive heat generating coating material is 0.2 mm. When the 80 V voltage is impressed from an AC power source 4 to the obtained paint film 2 for about 30 minutes, the surface temperature of the board 1 under the room temperature 20 deg.C becomes 110 deg.C. Then, the resistance value of the paint film 2 is 32 Ω. The heat resistance temperature of the paint film 2 of the conductive heat generating coating material is 200 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrically conductive heat-generating paint which has excellent conductivity and storage stability, is environmentally friendly and is economical.

[0002]

2. Description of the Related Art Conventionally, a conductive heat-generating paint has been used in a synthetic resin-based solution, such as an epoxy resin solution, which functions as a binder. (For example, silver powder). However, since this conductive heat-generating paint uses a synthetic resin-based solution having no conductivity, even if carbon black or graphite and metal powder are mixed, the conductivity is poor.

When a metal powder such as silver powder for increasing conductivity is added to the conductive heat-generating paint, the conductivity is improved, but the metal powder moves in the binder and the coating film becomes uneven. There was a problem.

When a synthetic resin solution is used as a binder, harmful gases are generated when the waste is incinerated as waste. Furthermore, since an organic solvent (eg, thinner) is used as a solvent, it is harmful to workers and the environment.

[0005]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems, to provide a conductive heat-generating paint which is excellent in conductivity and storage stability, is environmentally friendly and economical, and has a better heat-generating effect. It is to provide.

[0006]

In order to solve the above-mentioned problems, the present invention provides a conductive heat-generating paint composed of a mixture of fine powder of conductive carbon allotrope and an organic natural polymer binder containing water. To provide.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific examples of the conductive carbon allotrope according to the present invention include graphite powder (graphite) or carbon powder (carbon black), and typical examples of organic natural polymer binders. Is starch (a commonly used starch paste).

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As an embodiment of the present invention, there is provided a conductive heat-generating paint which is mixed at a ratio of 50 to 100 parts by weight of water-containing paste to 10 parts by weight of graphite powder. In the production of the present embodiment, graphite powder in an amount corresponding to the application area is put into a container, and the mixture is stirred for about 10 minutes with a rod-like material while gradually mixing the water-containing paste to adjust. In order to obtain a target resistance value, a resistance agent such as silicon carbide or cement is mixed and adjusted as necessary.

The conductive heat-generating paint prepared by stirring is applied to the board surface. At this time, it is desirable to apply a ceramic coating to the board surface before application. This is because ceramics have insulating properties, suppress water absorption, and have a low expansion coefficient. In the case of brush coating, when the conductive heat-generating paint that has been adjusted for stirring becomes a sol, it is applied to the board surface, and in the case of mechanical spray coating, it is diluted appropriately with water and applied. In the case of brush coating, natural drying is desirable in order to make the thickness of the coating film uniform.

In this embodiment, as shown in FIG.
Forming electrodes 3 on both sides on the surface of the board 1 having a width of 400 mm and a length of 400 mm;
The conductive heat-generating paint was applied with a brush and allowed to air dry.
The thickness of the coating film 2 of the conductive heating paint is 0.2 mm.

A voltage of 80 V from an AC power supply 4 is applied to the obtained coating film 2.
Is applied for about 30 minutes, and when the room temperature is 20 degrees Celsius,
The surface temperature of the board 1 became 110 degrees Celsius. At this time, the resistance value of the coating film 2 is 32 ohms. The heat resistant temperature of the coating film 2 of the conductive heat-generating paint in the embodiment is 200 degrees Celsius.

The conductive heat-generating paint according to the present invention has the following uses. Antistatic (antistatic), snow melting tiles, heating tiles, floor heating, wall heating (heating buildings, dwellings, public facilities, etc.), runway snow melting, road snow melting, railway rail snow melting, submarine melting, airplane melting, For sauna and engine warm,
Mirror fogging prevention, heating for house horticulture, heating of plant plumbing equipment, office equipment, home appliances, etc., prevention of snow melting and freezing due to heat generation (heating and heating), prevention of indoor and outdoor condensation.

[0013]

As described above, the configuration described above produces the following effects. First, since the metal powder is not mixed into the conductive heat-generating paint, the distribution density of the conductive agent due to the precipitation of the coating agent and the conductive agent as in the conventional conductive heat-generating paint does not occur, It is easy to mix uniformly at the time of stirring, and a conductive heat-generating paint having a stable and good conductive function is always obtained.

Second, since an organic natural polymer binder such as glue is used as the binder, no harmful gas is generated even when incinerated as waste, and it is environmentally friendly. As a result, a conductive heat-generating paint having a lower resistance value than the conductive heat-generating paint (can generate heat at a low voltage) is obtained.

Third, since the organic solvent (eg, thinner) is not used as the solvent and the water content of the organic natural polymer binder containing water is used, the conductive material is friendly to the painter and the environment. An exothermic paint is obtained. 4th
In addition, since it can be mixed and used during painting work,
In addition to excellent storage stability, the raw materials are inexpensive, and an economical conductive heat-generating paint can be obtained.

Fifth, if the voltage is constant according to the purpose,
A conductive heat-generating paint can be obtained in which the amount of heat generated between room temperature and 200 degrees Celsius can be freely set by adjusting the carbon allotrope, the organic natural polymer binder, and the resistor. Also, the temperature can be freely set by changing the voltage.

Sixth, according to the conductive heat-generating paint of the present invention, the surface of the object to be coated has a uniform temperature distribution from a wide heat-generating surface to a narrow heat-generating surface, and even in various shapes and uneven surfaces. The heating element can be manufactured.

[Brief description of the drawings]

FIG. 1 is an explanatory plan view of a heating board to which the present invention is applied;

[Explanation of symbols]

 1. . . . . . Board 2. . . . . . Coating film 3. . . . . . Electrode 4. . . . . . Power supply

Claims (3)

[Claims] 1. A conductive heat-generating paint composed of a mixture of fine powder of conductive carbon allotrope and an organic natural polymer binder containing water. 2. The conductive heat-generating paint according to claim 1, wherein graphite powder is used as the fine powder of the conductive carbon allotrope, and water-containing paste is used as the water-containing organic natural polymer binder. 3. A conductive heat-generating paint, wherein 10 to 100 parts by weight of conductive carbon allotrope is mixed with 50 to 100 parts by weight of water-containing paste.