The patented technology of the present invention relates to a graphite-containing plate (5) comprising a consolidated mixture of substantially uniformly distributed graphite particles (6) and plastic particles (7).

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【Abstract of Technical Implementation Steps】

【Foreign Patented Technology in China】

The patent technology of the present invention relates to a graphite-containing plate as claimed in claim 1; it also relates to a manufacturing method of the graphite-containing plate.

Technology Introduction

DE 103 41 discloses a lightweight heat conducting plate and a method for its manufacture. The heat conducting plates are made of expanded graphite which itself (expanded graphite) is compressed. Among others, the production of expanded graphite is sufficiently known in the prior art from US 3,404,061A. To produce expanded graphite, graphite intercalation compounds or graphite salts, such as graphite hydrogensulfate or graphite nitrate, are heated in a vibrating device. As a result, the volume of graphite particles increases by a factor of about 200-400, while the bulk density decreases to values of 2-20 g/l. This results in expanded graphite consisting of vermicular graphite or hexagonal graphite. In DE 103 lightweight heat-conducting plates, this expanded graphite is compressed under directional pressure, so that the planar graphite layers are preferably aligned perpendicular to the direction of action of the pressure and the individual aggregates are bonded to each other. In this way, self-supporting sheet structures in the form of nets or sheets can be produced without the use of additional adhesives. This binderless compressed heat transfer plate is basically dimensionally stable, but has low strength and is prone to cracking under lower loads. Therefore, for example, the bending strength of a rectangular heat conducting plate with a weight per unit area/m2, a thickness of 13mm, and a size of 11×13cm is only 0.1MPa. Because larger boards are difficult to process, only relatively small size boards, such as 50 x 50 cm boards, can be produced that are dimensionally stable. In particular, the large intrinsic weight of the plate causes the plate to break during wear only at one side edge. Therefore, these panels are not suitable for use in construction areas without additional reinforcement. In order to overcome these disadvantages, DE 103 41 proposes that, after pressing, the heat conducting plate should be partially or completely impregnated with a plastic material, such as resin or thermoplastic, to increase the density and its resistance to mechanical or other environmental influences. However, these expanded graphite sheets impregnated with a liquid after pressing have the disadvantage of inhomogeneous penetration of the liquid binder in the expanded compressed graphite. It has been recognized that the liquid binder penetrates uniformly only in the near-surface region of the compressed expanded graphite membrane. The adhesive only partially or not at all penetrates the inner regions of the membrane. The extent of the above problems is more severe in thicker sheets of compressed expanded graphite than in membranes. This uneven distribution of adhesive creates uneven reinforcement and stabilization in the panel, causing areas of the panel that are not visually identifiable relative to other areas to be more prone to fracture. FIG. 1 shows a schematic cross-sectional view of a lightweight heat conducting plate 1 . The liquid binder 3 penetrates into the compressed expanded graphite 2 from the sides of the plate 1 . However, the penetration of the adhesive 3 on the board was not uniform, especially in the area 4 delimited by the dotted oval line, which was devoid of adhesive, so its strength and stability relative to the bonded area of the board 1 were significantly different. decrease. Therefore, this area 4 is more prone to cracking than the bonded area of panel 1 .

Technical Implementation Ideas

Therefore, the purpose of this patent technology is to provide a graphite-containing plate and a manufacturing method of the graphite-containing plate to overcome the above-mentioned shortcomings and provide a plate with uniform reinforcement and stable dimensions. The object of the patent technology is achieved by a graphite-containing plate having the features of claim 1 and by a method for producing a graphite-containing plate having the features of claim 10 . Advantageous further developments and preferred embodiments of the plate and method are given in the dependent claims. The graphite-containing sheet material described in this patent technology is characterized in that it comprises a consolidated mixture of graphite particles and plastic particles substantially uniformly distributed. The sheets described in this patent can be produced by first mixing graphite particles and plastic particles to form a substantially uniform mixture of graphite particles and plastic particles, and then compacting the mixture. In a preferred embodiment, the graphite particles and the plastic particles are homogeneously distributed in the mixture, which can be achieved in particular by intensively mixing the particles for a long time. In an advantageous embodiment, from a product engineering point of view, the plate consists only of a mixture of graphite particles and plastic particles, without the addition of other additives. No additives are required to obtain a dimensionally stable panel. Advantageously, the mixture can contain 5 to 90% by weight, preferably 15 to 60% by weight and particularly preferably 20 to 50% by weight, of plastic particles in order to obtain a sufficiently stable panel. The graphite particles may advantageously comprise expanded graphite, and particularly advantageously be expanded graphite. The plastic particles may advantageously comprise thermoplastics and/or thermosetting plastics.

In a preferred version PVC can be used as plastic since it can be used at temperatures above 80°C. According to this patented technology, PVC is particularly advantageous when used as a thermally active component () in heating chambers, since the temperature of the thermal medium is often as high as 60°C. For plastic particles, polypropylene (PP), polyamide (PA), acrylonitrile-butadiene-styrene (ABS), polyetherketone (PEEK), polyvinylidene fluoride (PVDF), fluoropolymer benzene Oxazine and/or polysulfone (PP) are further suitable thermoplastics. A suitable thermosetting material is preferably epoxy resin, which is widely available, easy to process, relatively low cost and heat resistant. For higher requirements, phenolic and melamine resins, urea-formaldehyde resins and polyester resins, especially unsaturated polyester resins (UP resins), can advantageously be used. Consolidation of the mixture is preferably achieved by compression, in particular by pressing. For example, consolidation may also include successive melting and cooling steps to partially or completely melt the thermoplastic. A good bond between graphite particles and plastic particles can be achieved by this method. Especially when using thermosetting plastics, said consolidation may comprise a curing step. Said consolidation may also be accomplished by an optional or additional mixture sintering step. In an advantageous embodiment, said panel is plastically deformable, so that at the installation site it can simply be molded to the predetermined contours of the room's walls or ceiling, such as edges, curves, corners, friezes, etc.

For example, by heating the still plastically deformable sheet, it can be finally consolidated in the installed state at the installation site. An advantageous use of the panels in the patented technology is as a thermally active part for wall or ceiling cladding and/or for cooling or heating rooms, said mixture being initially pre-cured in order to retain the capacity for plastic deformation. At least one component, advantageously a pipe or conduit receiving a fluid cooling or heating medium, is then pressed into the plastically deformable mixture. Additionally or alternatively, the plastically deformable mixture or thus the plastically deformable panel is molded to a predetermined contour, eg may be molded to an uneven wall or ceiling shape. The plastically deformable mixture or sheet is then finally consolidated. Alternatively, at least one of the aforementioned components may be introduced into the mixture, advantageously before said mixture solidifies and the mixture is then finally cured. However, fixation elements such as anchors may advantageously be embedded therein as an assembly. The patented panels can be used in the construction sector, for example as ceiling or wall elements for fixing ceilings or walls. The panels with patented technology are thus suitable for example for room temperature control systems and acoustic elements for improved sound absorption. BRIEF DESCRIPTION OF THE DRAWINGS Further features and advantages of the patented technology of the present invention will be described in the following preferred embodiments with reference to the accompanying drawings. In the accompanying drawings, FIG. 1 shows a graphite-containing plate known in the prior art; FIG. 2 is a cross-sectional view of a graphite-containing plate according to the first embodiment of the patented technology. Fig. 3 is a cross-sectional view of a graphite-containing sheet according to a second embodiment of the present patented technology. As shown in the picture. FIG. 4 is a cross-sectional view of a graphite-containing plate according to a third embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in Figure 2, the graphite-containing plate 5 of the present patent technology is composed of graphite particles 6 made of expanded graphite, and the graphite particles 6 are well-known vermicular graphite or hexagonal graphite. Instead of expanded graphite, it is also possible to use natural graphite or artificial graphite, preferably in powder form. However, the advantage of expanded graphite is that, on the one hand, it can be easily compressed to a high degree, resulting in a low-density, dimensionally stable sheet; on the other hand, it can be easily mixed with solid plastic particles7. First graphite particles 6 are substantially homogeneously mixed with solid plastic particles 7, here PVC. This can be achieved in a known manner with known mixers, in particular for powdery materials. Here graphite particles 6 are mixed substantially homogeneously with plastic particles 7 to obtain a plate 5 as homogeneous and stable as possible, graphite particles advantageously accounting for at least 85%. The particles 6, 7 are preferably homogeneously mixed with one another. After mixing, the mixture is pressed in a known manner, forming a plate 5 by pressing. In order to increase the adhesion of the plastic particles 7 to each other and to the graphite particles 6 , the mixture is additionally heated so that the plastic particles 7 start to melt or even completely melt, and the plastic particles are then melt-bonded to each other and to the graphite particles. During the cooling process, by actively or passively cooling the mixture, the molten plastic particles 7 remain in a molten state while solidifying, thereby obtaining a stable plate 5 of uniform size.The above two steps - pressing and

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【Summary of Technical Features】

【Foreign Patented Technology in China】...

【Nature of patented technology】

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