DE202009018618U1 - Graphite-containing plate - Google Patents

Abstract

Plate (5) containing graphite, characterized in that it contains a solidified mixture of largely uniformly distributed graphite particles (6) and plastic particles (7).

Description

The invention relates to a graphite-containing plate according to the preamble of claim 1.

From the DE 103 41 255 B4 is a lightweight thermal conductor known. This heat conduction plate is made of known per se expanded graphite (Graphitexpandat) by compaction. The production of expanded graphite is well known from the prior art, including from US 3,404,061 A , Thus, for the production of expanded graphite Graphiteinlagerungsverbindungen or graphite salts such. B. graphite hydrogen sulfate or graphite nitrate shock-heated. The volume of the graphite particles increases by a factor of about 200-400 and at the same time the bulk density drops to values of 2-20 g / l. The graphite expandate thus obtained consists of worm-shaped or accordion-shaped aggregates. In the lightweight thermal plate of DE 103 41 255 B4 If such Graphitexpandat is compacted under the direction of a pressure, so that the layer planes of the graphite preferably arranged perpendicular to the direction of action of the pressure and the individual units interlock with each other. As a result, self-supporting, flat structures such as webs or plates can be produced without the addition of binders. Such compacted heat conducting plates without binders are basically dimensionally stable, but have a low strength, so they break apart easily at relatively low loads. For example, rectangular heat conducting plates having a weight per unit area of 1000 g / m ² , a thickness of 13 mm and a size of 11 × 13 cm only have a bending strength of 0.1 MPa. It can therefore only dimensionally stable plates with relatively small dimensions, for. B. 50 × 50 cm are made because larger plates are no longer manageable. In particular, even the weight of larger plates to the fact that the plate breaks when it touches on only one side edge. These panels are therefore not suitable for use in the construction sector without additional stiffeners.

To overcome this disadvantage, the beats DE 103 41 255 B4 prior to impregnation, the heat-conducting plates completely or partially impregnate with plastics, such as resins or thermoplastics in order to increase the tightness and resistance to mechanical and other environmental effects. However, this subsequent liquid impregnation of the compressed Graphitexpandatplatten has the disadvantage that the infiltration of the expanded, compacted graphite is carried out unevenly with the liquid binders. For example, it has already been found in films of compressed expanded graphite that they are uniformly infiltrated only in the area close to the surface. In more interior areas of the films penetrates the binder only insufficient or not at all. The same applies to an even greater extent for the sheets of thicker expanded graphite, which are significantly thicker than foils. This uneven distribution of the binder results in uneven stiffness and stability of the panels, such that the panels break more easily at locations not recognizable from outside than at others.

In 1 is a schematic cross section through such a lightweight heat conduction plate 1 shown. There is compressed, expanded graphite 2 from the side surfaces of the plate 1 subsequently with a liquid binder 3 been infiltrated. The binder 3 However, it has only unevenly penetrated into the plate, so that in particular a marked by the oval, dashed border area 4 binder-free 3 and thus significantly less stiff and stable than adjacent areas of the plate 1 is. This area 4 is thus more vulnerable to breakage than the adjacent areas of the plate 1 ,

It is therefore an object of the invention to provide a graphite-containing plate, which overcomes the disadvantages mentioned above and to provide a uniformly rigid and dimensionally stable plate.

This object is achieved by a graphite-containing plate with the features of claim 1. Advantageous developments and preferred embodiments of the plate are specified in the subclaims.

A graphite-containing plate according to the invention is characterized in that it contains a solidified mixture of substantially uniformly distributed graphite particles and plastic particles, which plate can be produced according to the invention by first mixing graphite particles and plastic particles into a mixture having a substantially uniform distribution of the graphite particles and plastic particles, and the mixture is then solidified.

In a preferred embodiment, the graphite particles and plastic particles may be homogeneously distributed in the mixture, which u. a. can be achieved by sufficiently long mixing of the particles.

In a production-technically advantageous embodiment, the plate can consist exclusively of the mixture of graphite particles and plastic particles, without having to add further additives are not necessary to obtain a dimensionally stable plate.

Advantageously, the mixture 5 to 90% by weight, preferably 15 to 60% by weight and particularly preferably 20 to 50% by weight of Contain plastic particles to obtain a sufficiently stable plate.

The graphite particles may advantageously contain expanded graphite, and more preferably exclusively expanded graphite. The plastic particles may advantageously contain thermoplastics and / or thermosets.

In a preferred embodiment can be used as plastic PVC, since it can also be used at temperatures above 80 ° C. This is particularly advantageous in the advantageous use of the plate according to the invention as a thermally active device for heating rooms, since temperatures of heating media are usually up to 60 ° C.

As further suitable thermoplastics, polypropylene (PP), polyamides (PA), acrylonitrile-butadiene-styrene (ABS), polyetherketone (PEEK), polyvinylidene fluoride (PVDF), fluoropolymers, benzoxazines and / or polysulfone (PP) can advantageously be used for the plastic particles ,

A suitable thermoset is preferably epoxy resin, which is widely used, easy to process, relatively inexpensive and temperature resistant. Phenol resins can advantageously be used for higher demands, as well as melamine resin, urea resins and polyester resins, in particular unsaturated polyester resins (UP resins).

Preferably, the solidification of the mixture by compression, in particular by means of compression, take place. Also, the solidification may include a melting and a cooling step to partially or completely melt, for example, thermoplastics. This makes it possible to achieve a good bond between graphite particles and plastic particles. In particular, when using thermosets, the solidification may include a curing step. Also, the solidification can be done by an alternative or additional sintering of the mixture.

In an advantageous embodiment, the plate is plastically deformable, so that it can be easily molded at the installation site to predetermined contours of walls or ceilings of rooms, such as edges, bends, corners, friezes, etc. Subsequently, the plate can then be finally solidified at the installation site, for example by heating the still plastically deformable plate in the installed state.

For the advantageous use of the panel according to the invention as a wall or ceiling paneling and / or as a thermally active component for cooling or heating of rooms, the mixture can first be pre-consolidated so that it remains plastically deformable. Subsequently, at least one component, advantageously tubes or pipes for receiving a fluid cooling or heating medium, are pressed into the plastically deformable mixture. Additionally or alternatively, advantageously, the plastically deformable mixture or the thus plastic deformable plate can be formed to a predetermined contour, for example, to be formed on non-flat wall or Deckenverläufen can. Subsequently, subsequently the plastically deformable mixture or plate can be finally consolidated. Alternatively it can be advantageously provided that before solidification of the mixture at least one component mentioned above is introduced into the mixture and subsequently the mixture is finally solidified. As components but can also be advantageously embedded fastener, anchors, etc.

Inventive plates can be used in the construction sector, for example, as a ceiling or wall element for attachment to a ceiling or wall. Thus, the plates of the invention are suitable for. B. for use in Raumtemperierungssystemen and in acoustic elements to improve the sound absorption.

Other features and advantages of the invention will become apparent from the following description of preferred embodiments with reference to the drawings. Show it:

1 a graphite-containing plate known in the art;

2 a cross section through a graphite-containing plate according to the invention according to a first embodiment;

3 a cross section through a graphite-containing plate according to the invention according to a second embodiment;

4 a cross section through a graphite-containing plate according to the invention according to a third embodiment.

An in 2 illustrated graphite-containing plate according to the invention 5 consists of graphite particles 6 Expanded graphite, which are worm or accordion in a known manner. Instead of expanded graphite, natural graphite or synthetic graphite, preferably in powder form, can also be used. However, expanded graphite has the advantage that it can be pressed well on the one hand to a dense, to a small extent dimensionally stable plate and on the other hand well with solid plastic particles 7 is miscible.

The graphite particles 6 be first with the solid plastic particles 7 , here PVC, largely uniformly mixed. This can be done in a known manner by per se known mixing devices for powdery materials. The graphite particles 6 be largely uniform, so advantageously at least 85%, with the plastic particles 7 mixed to a stable as evenly stable plate 5 to obtain. The particles are preferred 6 . 7 homogeneously mixed together.

After mixing, the mixture is in a known manner by pressure to the plate 5 pressed. To the bond between the plastic particles 7 with each other and with the graphite particles 6 To increase, the mixture is additionally heated so that the plastic particles 7 melt or even completely melt, then merge together and connect with the graphite particles. In a cooling process, which can be done by active cooling or passive cooling of the mixture, solidify the molten plastic particles 7 while maintaining its molten shape, leaving a uniformly dimensionally stable plate 5 is obtained.

The two steps mentioned above - pressing and heating - can also be carried out in succession. Alternatively or additionally, the solidification or compression can also be effected by curing and / or sintering. Also, these different types of consolidation can be combined.

By the inventive mixing of the graphite particles 6 and the plastic particles 7 to a mixture with a substantially uniform distribution of the particles before solidification can be compared to the known graphite-containing plates 1 advantageous uniform over its surface dimensionally stable, rigid, robust and easy to handle plate 5 getting produced.

Preferably show examples of use of the plate according to the invention and the manufacturing method according to the invention 3 and 4 , The same parts are provided with the same reference numerals as in 2 ,

3 shows the advantageous use according to the invention of a plate according to the invention 5 as a thermally active component in the form of a ceiling / wall cladding panel for heating and / or cooling a room. In this case, after mixing, the graphite particles 6 and the plastic particles 7 but before solidifying this mixture, two pipes 8th introduced centrally into the mixture. Subsequently, the mixture was finally solidified as described above. As a result, can be prepared in a simple way prefabricated and prepared for use as heating and / or cooling element wall cladding panels, so that a production of such plates and their use in the construction sector can be carried out on an industrial scale. Due to the great dimensional stability and rigidity of such plates, the handling and assembly of the plates in the construction site area is facilitated, in particular dimensionally stable plates can be made and used with larger dimensions without having to fear damage to the plates during transport and handling.

Such a plate with embedded pipes 8th can be used, for example, in a device for controlling the temperature of a room, wherein the device is at least one component, such as. B. a concrete ceiling or wall, which forms a thermal storage and having a surface facing in the space and wherein the conduits 8th coupled with the thermal storage and can be acted upon by a heating or cooling medium.

Such a device for temperature control of a room makes it possible to use the mass of ceilings or walls as a thermal storage without pipes must be introduced for the passage of a heating or cooling medium for thermal activation of the memory in the ceilings or walls. This provides an energy-efficient temperature control system with short response times, which can also be retrofitted to refurbish old buildings.

4 shows the advantageous use according to the invention of a plate according to the invention 5 as a thermally active component in the form of a ceiling / wall cladding panel for heating and / or cooling a room. This was in contrast to the execution in 3 after mixing the graphite particles 6 and the plastic particles 7 , the mixture first pre-consolidated so that it is still plastically deformable, and only then two pipes 9 in the plastically deformable plate 5 pressed in and subsequently the plate 5 or the mixture finally solidified, as described above. In the execution after 4 the advantages arise as in the execution 3 ,

In a further development of the plate 5 out 4 This can advantageously first pre-consolidated plastically deformable during manufacture, then transported to the site, such as a construction site, and only there the pipes 9 in suitable places in the plate 5 be pressed. Subsequently, the final consolidation is carried out on site, for example by heating the still plastic deformable plate 5 in already installed condition. As a result, the laying of the pipes 9 easily adapted to the specific conditions on site.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 10341255 B4 [0002, 0002, 0003]
• US 3404061 A [0002]

Claims (11)

Graphite-containing plate ( 5 ), characterized in that it comprises a solidified mixture of largely evenly distributed graphite particles ( 6 ) and plastic particles ( 7 ) contains. Plate ( 5 ) according to claim 1, characterized in that the graphite particles ( 6 ) and plastic particles ( 7 ) are homogeneously distributed in the mixture. Plate ( 5 ) according to claim 1 or 2, characterized in that at least one component ( 8th ; 9 ) into the plate ( 5 ) is embedded. Plate ( 5 ) according to claim 1 or 2, characterized in that it consists exclusively of the mixture of graphite particles ( 6 ) and plastic particles ( 7 ) consists. Plate ( 5 ) according to one of the preceding claims, characterized in that the graphite particles ( 6 ) contain expanded graphite. Plate ( 5 ) according to any one of the preceding claims, characterized in that the mixture 5 to 90% by weight, preferably 15 to 60% by weight and particularly preferably 20 to 50% by weight of plastic particles ( 7 ) contains. Plate ( 5 ) according to one of the preceding claims, characterized in that the plastic particles ( 7 ) Thermoplastics and / or thermosetting plastics. Plate ( 5 ) according to one of the preceding claims, characterized in that the plastic particles ( 7 ) Polyvinyl chloride (PVC), polypropylene (PP), polyamides (PA), acrylonitrile-butadiene-styrene (ABS), polyether ketone (PEEK), polyvinylidene fluoride (PVDF), fluoropolymers, benzoxazines and / or polysulfone (PP). Plate ( 5 ) according to one of the preceding claims, characterized in that the plastic particles ( 7 ) Epoxy resin, phenolic resin, melamine resin, urea resins, and / or polyester resins, in particular unsaturated polyester resins (UP resins). Plate ( 5 ) according to one of the preceding claims, characterized in that it is plastically deformable. Plate ( 5 ) according to one of the preceding claims, characterized in that it is shaped in a predetermined contour.

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