FR3077294A1 - COMPOSITION FOR ELECTROCONDUCTIVE MATERIAL AND ITS APPLICATIONS - Google Patents

Abstract

The invention relates to a material composition, characterized in that it comprises a base material mixed with a binder and at least one electroconductive material in powder whose concentration is studied in order to obtain the necessary electro-conductivity. . The invention also relates to a capacitive composite application, remarkable in that it consists of a mixture of a base material with a binder and at least one electroconductive material in powder whose concentration is studied in order to obtain the necessary electro-conductivity. Applications: capacitive, electro-conductive, heating, Faraday cage.

Description

COMPOSITION FOR MATERIAL AND ITS APPLICATIONS

FIELD OF APPLICATION OF THE INVENTION

The present invention relates to the field of electrical and capacitive conductivity applications and in particular to adaptations making it possible to implement such an application under the best conditions.

DESCRIPTION OF THE PRIOR ART

Interactions affected by

The invention relates to the following applications:

- electrical conduction,

- capacitive,

- Faraday cage.

Capacitive applications are, for example, devices employing the capacitive principle to detect the contact or approach of a human being relative to a surface.

An electro-conductive surface capable of detecting said touch or approach is then used. This surface is connected to an electronic module detecting the change in capacity of the surface when it is touched or when it is approached.

To materialize such a surface, there are a plurality of solutions:

Object / use of an electroconductive metal surface,

Use of electrically conductive coating applied to a surface / an object which is not.

Among these coatings, there are also paints, inks that can serve to partially or completely cover a surface.

The Applicant has found that these different solutions required that these coatings be applied as outer layers.

This electrically conductive outer layer therefore becomes an option and an additional cost for the initial product. It also applies once the support is finished or installed, which requires suitable means of application.

In addition, it cannot be covered without seeing its electro-conductive properties suppressed or greatly diminished.

Finally, it cannot be covered because it has no mechanical strength allowing it to support a load or to authorize and maintain the adhesion of an outer layer

DESCRIPTION OF THE INVENTION

On the basis of this fact, the applicant has carried out research aimed at proposing a technical solution which overcomes the drawbacks of the prior art

This research has led to the design and implementation of a composition of a material, remarkable in that it comprises a basic material mixed with a binder and at least one electroconductive powder material whose concentration is studied in order to obtain the necessary electro-conductivity

The use of a pulverulent material facilitates its mixing with other materials and in particular with materials of the plaster, mortar or even wood fiber type. It thus appears that the use of an electroconductive powder material is capable of bringing electroconductive characteristics to a plurality of basic materials in the construction or furniture field.

So while in the prior art,

Electro-conductivity was likely to be an option added as an outer layer, the invention proposes to make basic materials electrically conductive by mixing therein at the time of their manufacture an electrically conductive material in powder form

The required electro-conductivity and therefore the concentration of the powdered electro-conductive material are defined according to the envisaged application.

According to another particularly advantageous characteristic of the invention, this composition comprises a base material mixed with a binder and at least with powdered graphite, the concentration of which is studied in order to obtain the necessary electroconductivity

The advantage of graphite is that it is an electroconductive component, which can be reduced to powder and is inexpensive.

The term graphite according to the invention groups together both the material formed from pure graphite and the materials called graphite but formed from a mixture between graphite and another material.

Thus, for example, according to a preferred but nonlimiting embodiment, the graphite used is amorphous graphite, a powdered material resulting from the combination of two minerals: graphite and shale. This so-called graphite powder is composed of sixty / seventy percent of carbon.

According to another particularly advantageous characteristic of the invention, this composition comprises a base material mixed with a binder and with graphite whose concentration is between ten and seventy percent of the total volume in order to obtain the necessary electroconductivity .

According to another particularly advantageous characteristic of the invention, this composition comprises a base material mixed with a binder and graphite, the concentration of which is between thirty and fifty percent of the total volume in order to obtain the necessary electro-conductivity .

According to another particularly advantageous characteristic of the invention, the composition is remarkable in that it comprises a basic material mixed with a binder and with graphite, the concentration of which is determined in order to obtain the electro-conductivity necessary for a capacitive application. The operation of electro-conductive applications using such a material is based on Kirchhoff's law.

According to another particularly advantageous characteristic, this composition is intended to be covered. Indeed, this is an intermediate material positioned between a support material, masonry and a top coat.

Such a composition will ensure the implementation of a capacitive application proposing an intelligent material allowing tactile interactions with its user by capacitive principle while being covered. The use of a binder and a base material will provide the composition with the characteristics necessary to withstand loads, constraints and retain an aesthetic outer layer.

The capacitive composition (the electrically conductive material) detects the electric field radiated by the human body which comes into contact with it. The electric field is captured and then diffused in a circuit. It then reaches an electronic system located at a fixed location in the place where the composition is applied. The electronic system will intercept the electric field as an order to activate or deactivate a technology (sound, light, etc.).

This composition authorizes a relationship between the user and his home. It allows the creation of tactile surfaces allowing intelligent interactions. The presence of graphite in the proportions described in the composition provides the latter with conductivity even once covered, both to capture the touch and to capture the presence or the approach.

Thus, according to a particularly advantageous characteristic, it constitutes a covered conductive coating capable of being used applied to a wall. One embodiment is the implementation of a switch function by capturing the contact or movement of a user with respect to a vertical wall of the partition or wall type supporting the coated plaster of the invention.

There are many advantages over a conventional switch:

- the "switch" function implemented by the plaster is more comfortable because it is adaptable according to needs and desires and it avoids having to cross a room to go to press a remote switch,

- the "switch" function avoids the installation of a two-way switch,

- the use of a coating leaves room for creativity in the artistic with regard to the aesthetic layer covering it,

- applications related to health and learning are possible,

- Faraday cage applications are possible,

- applications that conduct electricity and / or heat are possible, the surfaces forming switches can be highlighted by any means (texture, relief, color),

- ease of connecting to existing electrical systems,

- ease of applying the coating to existing walls.

According to another particularly advantageous characteristic of the invention, it constitutes a covered conductive mortar capable of being used as mortar applied to a floor.

It is understood that the invention can have different uses as in the field of home automation. As described above, it can act as a switch but also as an alarm system. For a ground application, the invention can be applied to assisting disabled people by creating a path for the visually impaired or even sensory awakening in children through interactive games.

Thus, according to one embodiment, once the mortar composition is applied to the floor, it is envisaged to have sound and non-sound tiles on said floor in order to create a path in the room. The electroconductive mortar composition is then applied according to a laying template separating the different electroconductive zones.

The composition is therefore an undercoat product which can be used as a plaster applied to a wall or as a mortar if applied to a floor. The advantage of an undercoat product is that it allows the client to have the appearance he desires for his surface unlike the products of the prior art. By being composed of graphite, this sub-layer has the particularity of conducting electricity which allows to activate technologies such as lights or sounds by a simple contact. The user can therefore turn on the lights or activate a sound by simply touching the wall on which the composition is placed as a coated plaster. The invention therefore makes it possible to give additional functionality to masonry products including sub-layers intended to be covered.

It is the same for the composition which comprises, mixed with the electrically conductive material which may be graphite, particles of wood constituting the base material associated with glue constituting the binder. Such a composition can be covered with melamine sheets, thus allowing a weight panel composed of chipboard and melamine, the basic element necessary for the manufacture of a plurality of movable articles, to be able to implement a capacitive application. .

By mixing conductive materials in powder form with basic products, the invention proposes the implementation of capacitive applications at low cost. In addition, graphite remains an inexpensive material and easy to integrate into an unattractive product composition serving as an undercoat.

The Applicant has established that the particle size is particularly important for proposing a homogeneous mixture offering electro-conductive characteristics. Thus, to do this, according to another particularly advantageous characteristic of the invention, the particle size of the powdered electroconductive material is less than that of at least one of the other constituent elements of the composition.

More specifically, according to another particularly advantageous characteristic of the invention, the particle size of the electroconductive powder material is less than that of all the other constituent elements of the composition.

According to another particularly advantageous characteristic, the composition of the invention serves as the basic composition for a prefabricated masonry element.

According to another particularly advantageous characteristic, said binder is an adhesive.

Several coating compositions have been designed.

According to another particularly advantageous characteristic of the invention, said coating comprises

- thirty percent graphite,

- thirty-five percent plaster as a binder,

- thirty-five percent marble powder.

According to another particularly advantageous characteristic of the invention, said coating comprises

- fifty percent graphite,

- 25% plaster as a binder,

- twenty-five percent marble powder.

According to another particularly advantageous characteristic of the invention, said coating comprises

- thirty percent graphite,

- seventy percent of the earth constituting the binder and the base material.

According to another particularly advantageous characteristic of the invention, said coating comprises

- fifty percent graphite, fifty percent earth constituting the binder and the base material.

Likewise, several mortar compositions have been designed.

According to another particularly advantageous characteristic of the invention, said mortar comprises

- thirty percent graphite,

- seventy percent of adhesive mortar constituting the binder and the base material.

According to another particularly advantageous characteristic of the invention, said mortar comprises

- fifty percent graphite,

- fifty percent of adhesive mortar constituting the binder and the base material.

As explained above, the invention also applies to furniture elements by integrating the graphite particles in the composition of the wood panels. Thus, according to another particularly advantageous characteristic of the invention, the composition comprises, mixed with graphite, particles of wood constituting the base material associated with glue constituting the binder.

Another object of the invention relates to an application of capacitive composite, remarkable in that it consists of a mixture of a base material with a binder and at least one electroconductive powder material whose concentration is studied. in order to obtain the necessary electro-conductivity. The concentration of graphite, for example, varies depending on the application to be implemented (capacitive, electro-conductive, heating, Faraday cage).

This application of capacitive composite according to the preceding characteristic implements any of the compositions described above.

The fundamental concepts of the invention having just been exposed above in their most elementary form, other details and characteristics will emerge more clearly on reading the description which follows and with reference to the appended drawings, giving by way of 'nonlimiting example, two embodiments of a capacitive application using a composition according to the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an example of a capacitive application detecting the contact of the hand of a user for the purpose of controlling a light;

FIG. 2 is an example of a capacitive application detecting the contact of the foot of a user for guidance purposes;

Figure 3 is a schematic drawing of a sectional view of a portion of wall receiving a composition according to the invention. DESCRIPTION OF THE PREFERRED EMBODIMENTS

As illustrated in the drawing in FIG. 1, the part P comprises a plurality of walls 100 and 200, one of which 100 is equipped with a coating in accordance with one of the coating compositions of the invention and the other of which 200 includes a lamp 210 supplied with electricity. The supply of electricity to this lamp 210 is controlled by an electronic box (not illustrated) connected to the composition covering the wall 100. More precisely, according to the nonlimiting embodiment illustrated in the drawing of FIG. 3, the wall 100 is formed of a base wall 110 covered with the composition 120 according to the invention itself covered with a wallpaper 130. The electronic unit is connected to the layer 120. The user U comes to touch the wall 100 which detects a change in capacity which the electronic unit interprets as a command:

- to light the lamp 210 if it is off,

- to extinguish the lamp 210 if it is on.

The electronic boxes equipped with programmable microcontrollers are able to detect the change in capacity and transform the detection into an opening / closing command of an electrical circuit.

Independently of or in addition to the installation described for FIG. 1, the application of FIG. 2 illustrates the exploitation of the detection of the contact of the foot of the user U by an underlay covering the ground S, under -layer which, using one of the mortar compositions of the invention, is covered with sound panels or not. The coating detects contact or movement and transmits information to the sound panels, which emit a sound signal if contact is detected in their area. A guide path is then created and allows the user U to go towards the door 300.

It is understood that the composition, which has just been described and shown above, was for the purpose of disclosure rather than limitation. Of course, various arrangements, modifications and improvements could be made to the example above, without however departing from the scope of the invention.

Claims (19)

1. Composition of material, CHARACTERIZED BY THE FACT Qü'elle comprises a basic material mixed with a binder and at least one electroconductive powder material whose concentration is studied in order to obtain the electroconductive necessary for applications following: - electrical conduction, - capacitive, - Faraday cage. 2. Composition of material according to claim 1, CHARACTERIZED BY THE FACT That it comprises a basic material mixed with a binder and at least powdered graphite whose concentration East studied in order to obtain 1'électro-conductivity necessary to the following applications: - electrical conduction, - capacitive. - Faraday cage. 3. Composition of material according to the claim 2 CHARACTERIZED BY THE FACT What she understands a material of based mixed with a binder and graphite, the concentration of which is between ten and seventy percent of the total volume in order to obtain the necessary electro-conductivity. 4. Composition of material according to claim 3, CHARACTERIZED BY THE FACT Qü'elle comprises a basic material mixed with a binder and graphite whose concentration is between thirty and fifty percent of the total volume to obtain the electro-conductivity required. 5. Composition of material according to claim 3, CHARACTERIZED BY THE FACT Qü'elle comprises a basic material mixed with a binder and graphite whose concentration is determined in order to obtain the electro-conductivity necessary for a capacitive application. 6. Composition according to any one of claims 1 to 5, CHARACTERIZED BY THE FACT Qü'elle constitutes a coated conductive coating capable of being used applied to a wall. 7. Composition according to any one of claims 1 to 5, CHARACTERIZED BY THE FACT Qü'elle constitutes a covered conductive mortar capable of being used as a mortar applied to a floor. 8. Composition according to any one of claims 1 to 5, CHARACTERIZED BY THE FACT THAT it serves as a basic composition for a prefabricated masonry element. 9. Composition according to any one of claims 1 to 5, CHARACTERIZED BY THE FACT THAT the particle size of the electroconductive powder material is less than that of at least one of the other constituent elements of the composition. 10. Composition according to claim 8, CHARACTERIZED BY THE FACT THAT the particle size of the powdered electroconductive material is less than that of all the other constituent elements of the composition. 11. Composition according to claim 6, CHARACTERIZED BY THE FACT THAT said coating comprises - thirty percent graphite, - thirty-five percent plaster as a binder, - thirty-five percent marble powder. 12. Composition according to claim 6, CHARACTERIZED BY THE FACT THAT said coating comprises - fifty percent graphite, - 25% plaster as a binder, - twenty-five percent marble powder. 13. Composition according to claim 6, CHARACTERIZED BY THE FACT THAT said coating comprises - thirty percent graphite, - seventy percent of the earth constituting the binder and the base material. 14. Composition according to claim 6, CHARACTERIZED BY THE FACT THAT said coating comprises - fifty percent graphite, - fifty percent of the earth constituting the binder and the base material. 15. Composition according to claim 7, CHARACTERIZED BY THE FACT THAT said mortar comprises - thirty percent graphite, - seventy percent of adhesive mortar constituting the binder and the base material. 16. Composition according to claim 7, CHARACTERIZED BY THE FACT THAT said mortar comprises - fifty percent graphite, - fifty percent of adhesive mortar constituting the binder and the base material. 17. Composition according to any one of claims 1 to 5, CHARACTERIZED BY THE FACT THAT it comprises, mixed with the electrically conductive material, wood particles constituting the base material associated with glue constituting the binder. 18. Composition according to any one of claims 1 to 5, CHARACTERIZED BY THE FACT THAT said binder is an adhesive. 19. Application of capacitive composite, CHARACTERIZED IN THAT it is constituted by a mixture of a base material with a binder and at least one electro-conductive powder material whose concentration is studied in order to obtain electro -conductivity necessary for the following applications: - electrical conduction, - capacitive, - Faraday cage, said mixture being positioned between a support material, masonry and a finishing layer. 20. Application of a capacitive composite according to the preceding claim using the composition of any one of claims from 1 to 18.