Sustainably manufactured multilayer tube

Abstract

To provide a sustainably manufactured multilayer tube.SOLUTION: A first plastic recyclate is used for a tube (1) of a land vehicle, in particular of a road vehicle. The tube (1) comprises a first layer (2) and a second layer (3), where the first layer (2) and the second layer (3) abut on each other. The first layer (2) has the first plastic recyclate, and the second layer (3) comprises a first virgin plastic. The first plastic recyclate and the first virgin plastic belong to the same plastic species, e.g., to the plastic species of polyamides or of polyolefins.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to the use of a sustainably manufactured multi-layer tube for land vehicles, particularly road vehicles, wherein the tube has a first layer and a second layer, and the first layer and the second layer are in contact with each other.

Background Art

[0002] Fuel tanks using plastic recyclates are already known from German Patent Application Publication No. 102016226064. The wall of the fuel tank has multiple layers of various thermoplastics such as high-density polyethylene (HDPE), low-density polyethylene (LDPE), and ethylene vinyl alcohol copolymer (EVOH). The order of the layers from the inside to the outside of the tank wall is, for example, HDPE, LDPE, EVOH, LDPE, recyclate, HDPE. Plastic waste accumulates when using extrusion blow molding for manufacturing multi-layer fuel tanks, and hereinafter, the whole of it is referred to as slag. Therefore, slag is a mixture of the corresponding proportions of plastics of HDPE, LDPE, and EVOH. Here, HDPE accounts for about 2 / 3 by weight ratio, LDPE accounts for about 1 / 3, and EVOH accounts for a single-digit ratio or less by weight ratio because the layer thickness of the tank wall is small.

[0003] According to German Patent Application Publication No. 102016226064, the slag is pulverized into granules and returned to the process as a plastic recyclate by using the plastic recyclate as a separate layer in the tank wall. Since there is relatively a lot of plastic waste associated with production, the layer of recyclate accounts for more than half of the weight ratio of the fuel tank. By using recyclates, the sustainability of the manufacturing process is significantly improved.

[0004] The drawback of a known plastic tank with recycled materials is that the conditions of the tank's layers cannot be used for the tube. In particular, considering the space conditions of a vehicle, the tube generally has to be bent more strongly in many places, so the wall of the tube is considerably thinner than that of the tank. Therefore, each layer of the tube must exhibit the maximum effect with the minimum thickness, so it is necessary to synchronize the layers of the tube more precisely. Another reason for the lack of compatibility of conditions is that the manufacturing method of the tank is completely different from that of the tube. Unlike the tank which is formed one by one, the tube is continuously extruded by extrusion blow molding.

[0005] The tube known from WO 2017 / 220657 pamphlet comprises an inner virgin HDPE layer, an outer virgin HDPE layer, and an intermediate layer of HDPE recycled material. In this case, the HDPE recycled material is taken from consumer waste with lower cleanliness rather than industrial waste. The tube has a wall thickness of 5 mm and a diameter of 110 mm, and is thus many times larger than that of a land vehicle. For example, the tube known from WO 2017 / 220657 pamphlet is suitable for the transportation of waste water and is thus subject to moderate requirements.

[0006] However, the tubes of land vehicles are subject to more severe conditions in many respects compared to sewer tubes. The tubes of land vehicles are designed very compactly and have to pass through the narrow space of land vehicles by bending many times. In addition, the tubes of land vehicles often have to withstand the effects of very high pressure and / or temperature and harsh environments simultaneously. Many of the tubes of land vehicles provide very low permeability with the assistance of a specially adjusted barrier layer according to the active fluid.

[0007] Due to these technical requirements accompanied by known cost pressures in the automotive supply industry, an extremely well-differentiated and thoroughly thought-out tube structure is brought about, which is reflected in a large number of layers such as 5, 6, or 7 layers of the tube wall. The tube known from WO 2017 / 220657 Pamphlet is not suitable for use in land vehicles because it is inappropriate not only in terms of dimensions but also especially in terms of the materials used (exclusively standard plastic HDPE). In order to be able to meet the aforementioned requirements, at least some of the tube layers need to have technical plastics or high-performance plastics.

SUMMARY OF THE INVENTION

PROBLEMS TO BE SOLVED BY THE INVENTION

[0008] Therefore, an object of the present invention is to manufacture a tube for use in land vehicles, which is manufactured by a more sustainable manufacturing process and simultaneously meets a number of technical requirements.

MEANS FOR SOLVING THE PROBLEMS

[0009] The aforementioned object is achieved by using a first plastic recyclate for the tube of a land vehicle, particularly a road vehicle. The tube comprises a first layer and a second layer, and the first layer and the second layer are in contact with each other. The first layer contains a first plastic recyclate, and the second layer contains a first virgin plastic. The first plastic recyclate and the first virgin plastic belong to the same type of plastic, for example, plastics of polyamide or plastics of polyolefin.

[0010] The present invention is based on the finding that a first plastic recycling material exhibits an adhesion behavior very similar to that of the first virgin plastic of the same plastics, despite contamination or reuse. For this reason, the basic layer arrangement of the tube without using the recycling material can be strengthened by the layer of the recycling material, thereby reducing the need for adjustment. As a result, the virgin layer to be partially replaced is designed thinner and strengthened by the recycling layer. The layer of the recycling material or the first layer with the plastic recycling material adheres very well to the first virgin plastic of the second layer and, if a third layer is provided on the opposite side, also adheres well to the third layer.

[0011] Furthermore, it has been found that, compared to the corresponding virgin plastic, the recycling material may partially meet or not meet at all the specifications regarding mechanical properties and / or barrier properties and cannot completely replace the virgin plastic. For this reason, the present invention is based in particular on the finding that the first virgin plastic continues to be necessary so that each intended function of the layer is fully realized and the wall thickness is not excessively increased. Nevertheless, a significant part of the virgin plastic becomes economical. For this reason, the tube according to the present invention is manufactured more sustainably and at the same time does not suffer any loss in quality. As a result, the object according to the present invention is achieved.

[0012] The term "recycled material" preferably refers to plastics that have already undergone the manufacturing process and are in the form provided to the (end) user. In this case, for example, it includes extruded products, injection molded products or semi-finished products, or materials that have become defective during the manufacturing process. In the German Patent Application Publication No. 102016226064, which is the prior art described at the beginning, products are manufactured from virgin plastics and production is designed such that plastic waste accumulates. Products manufactured from virgin plastics are supplied to the market and consumers and go through the consumption cycle, but plastic waste is different. After being accumulated, plastic waste is supplied to the above-mentioned manufacturing process or other manufacturing processes substantially immediately. Generally, plastic waste that has undergone the manufacturing process is much purer than plastic materials that have gone through a complete consumer cycle. The term "recycled material" preferably refers only to plastic waste from industrial manufacturing or industrial recycled materials (industrial recycled materials). However, the term "recycled material" also includes recycled materials from end users (consumer recycled materials), for example, those obtained from the pure substances of the "yellow bag" recycling system.

[0013] From a physical perspective, plastics can be classified into thermoplastics, thermosetting plastics, and elastomers. Furthermore, it is also possible to define a group of plastics that combines the characteristics of both. An example of this is the group of plastics known as thermoplastic elastomers. Additionally, the group of plastics can be further divided into subgroups that include amorphous or (at least) partially crystalline plastics. In particular, the group of thermoplastics includes plastics that are polymers containing polyamide (PA), polyolefin (PO), or vinyl alcohol (VA). Plastics containing polyamide include plastics such as aliphatic polyamide, aromatic polyamide (aramid), and semi-aromatic polyamide. For example, plastics containing polyolefin include plastic grades of polypropylene (PP) and polyethylene (PE). For example, plastics that are polymers containing vinyl alcohol include plastic grades of polyvinyl alcohol (PVOH) and ethylene vinyl alcohol copolymer (EVOH).

[0014] For example, plastic grades of aliphatic polyamide include plastic types such as PA6 or PA11. For example, plastic grades of semi-aromatic polyamide (polyphthalamide) include plastic type PA9T. For example, plastic grades of polypropylene include plastic type isotactic polypropylene. For example, plastic type HDPE belongs to the plastic grade of polyethylene. Various plastic types distinguished by differences in degree of hydrolysis belong to the plastic grade of PVOH. Plastic grades of EVOH include various plastic types depending on the ethylene ratio in mol%.

[0015] In particular, the group of thermoplastic elastomers includes plastics of dynamically crosslinked thermoplastic elastomers (TPV). The plastic grades of dynamically crosslinked thermoplastic elastomers are EPDM / PP matrices and are known under the trade name Santoprene. The plastic grades of PP matrix / EPDM include multiple plastic types, and these plastic types are each characterized by a specific weight composition of EPDM and PP. Among them, the plastic group of elastomers includes plastics of ethylene-propylene copolymers (E / P). For example, the plastics of E / P rubber include plastics of ethylene-propylene-diene rubber (EPDM). The plastics of EPDM include a series of plastic types characterized by specific weight ratios of ethylene and diene respectively.

[0016] The examples described above show the classification of the terms "plastic type", "plastic grade", and "plastics". A plastic type is a plastic with clearly defined properties, and a plastic grade is the closest general term for plastic types. Also, plastics is the closest general term for each plastic grade.

[0017] The plastics of the first plastic recycling material and the first virgin plastic are preferably selected from plastics consisting of polyamide, polyolefin, polyurethane, polymers containing vinyl alcohol, fluoropolymers, dynamically crosslinked thermoplastic elastomers, urethane-based thermoplastic elastomers, and olefin-based thermoplastic elastomers.

[0018] According to a particularly preferred embodiment, the first plastic recycling material and the first virgin plastic belong to the same plastic grade and preferably to the same plastic type. Thereby, the object stated at the beginning is particularly satisfactorily achieved. In practice, there is a preconception that plastics of the same plastics, especially plastics of the same plastic grade, such as two different aliphatic polyamides, can be used without problems in the first layer and the second layer. A tube having a first layer containing a recycling material of PA12 can be an example. The second layer of this exemplary tube can contain virgin (unused) PA612 plastic (virgin PA612 plastic). The idea of using as identical materials as possible in the first layer and the second layer was quite different in previous practice. Instead, it was aimed at combining all kinds of polyamides with each other to form a laminated composite. This is based on the background that polyamides are very often used in multilayer tubes, along with the most frequently used technical plastics. Thereby, the recycling material of PA can be used in multilayer tubes particularly inexpensively. However, this obscures the fact that, especially with respect to the minimum number of layers, the wall thickness of the tube, and various technical considerations regarding functionality, the cost aspect runs counter. In contrast, the present invention is based on the finding that, in particular, when using a recycling material of PA12 in the first layer and virgin (unused) PA612 plastic (virgin PA612 plastic) in the second layer, while the object stated at the beginning can be achieved, there are still many drawbacks remaining. For example, the above combination replacing the single layer of PA612 up to now often requires adjusting the layer in contact with the layer of the recycling material of PA12 located on the opposite side of the layer of PA612 with respect to the layer of the recycling material of PA12.

[0019] In particular, it has been found that when the first plastic recycling material and the first virgin plastic belong to the same plastic grade, preferably the same plastic type, it is possible to omit or not perform any adjustment of the opposing layers at all. In particular, there is substantially no need for an adhesion promoting layer disposed between the first layer and the layer opposing the second layer. At the same time, the first layer replaces as much as possible a part of the virgin layer heretofore, whereby the total thickness of the first layer and the second layer combined, and thus the wall thickness of the tube, becomes as small as possible.

[0020] According to a particularly preferred embodiment, the ratio of the layer thickness of the first layer to the total thickness of the first layer and the second layer combined is at most 95%, 90%, 85%, 80%, 75% or 70%. It is preferred that the ratio of the layer thickness of the second layer to the total thickness of the first layer and the second layer combined is at least 5%, 10%, 15%, 20%, 25% or 30%. The ratio of the layer thickness of the first layer to the total thickness of the first layer and the second layer combined is advantageously at least 30%, 40%, 50%, 60% or 70%. It is preferred that the ratio of the layer thickness of the second layer to the total thickness of the first layer and the second layer combined is at most 70%, 60%, 50%, 40%, 30%. It has been found that when using the first layer containing the first plastic recycling material, the second layer cannot be completely eliminated. Therefore, the object described at the beginning is particularly preferably achieved by the described layer thickness ratio (layer thickness ratio). For example, it has been easy to consider replacing the virgin layer with a layer of a slightly thicker recycling material, so this is a surprising recognition. However, this is not the case here, and in particular the described preferred layer thickness ratio (layer thickness ratio) represents a particularly advantageous technical solution.

[0021] The layer thickness of the second layer is preferably at most 0.7 mm, 0.6 mm, 0.5 mm, 0.4 mm or 0.35 mm. The second layer preferably has a layer thickness of at least 0.05 mm, 0.07 mm or 0.09 mm. The layer thickness of the first layer is preferably at least 0.2 mm, 0.3 mm or 0.4 mm. The layer thickness of the first layer is at most 1.5 mm, 1.2 mm, 1.0 mm, 0.8 mm or 0.6 mm.

[0022] According to a preferred embodiment, the layer thickness of the first layer is at least 10%, 15% or 20% with respect to the overall wall thickness of the tube. The layer thickness of the first layer is preferably at most 70%, 60%, 50% or 40% of the overall wall thickness of the tube.

[0023] The molar mass distribution of the first plastic recycling material or the first layer is preferably broader than that of the first virgin plastic and / or the second layer. In other words, it is preferable that the polydispersity of the molar mass distribution of the first plastic recycling material or the first layer is greater than the polydispersity of the molar mass distribution of the first virgin plastic and / or the second layer. The molar mass distribution of the first plastic recycling material may be bimodal or multimodal. Therefore, the molar mass distribution of the first plastic recycling material may have a plurality of maxima. In this case, it is preferably understood that the term polydispersity means adding the individual polydispersities of the individual maxima on the condition that the polydispersities of the individual maxima do not overlap. On the other hand, when the polydispersities of the individual maxima overlap, the lower limit value and the upper limit value of the overlapping polydispersities are subtracted from each other to determine the overlapping polydispersity. It is particularly preferable that the polydispersity of the molar mass distribution of the first plastic recycling material is at least 1.1 times, 1.2 times, 1.3 times, 1.4 times, 1.5 times or 1.6 times the polydispersity of the molar mass distribution of the first virgin plastic.

[0024] The weight percentage of the first plastic recycling material in the first layer is preferably at least 70%, 80%, 90%, 95%, 97% or 99%. The weight percentage of the first virgin plastic in the second layer is at least 70%, 80%, 90%, 95%, 97% or 99%. The remaining weight ratio of the first layer or the second layer preferably contains at least 50%, 70% or 90% of additives. It is highly preferred that the first layer and / or the second layer do not contain additional plastics.

[0025] The color of the first layer may be darker than that of the second layer. This is obtained by using recycled materials that are slightly less pure than virgin (unused) materials overall. The first layer has a predetermined color tone, particularly a gray color tone, in the darker half, especially in the outer third, of the accompanying color table. The second layer preferably has a color tone in the lighter half or the outer third of the accompanying color table. The color of the first layer is at least gray, preferably dark gray, particularly preferably black. The second layer preferably has a white color tone. In one embodiment, the first layer contains a pigment. The pigment is located in the outer third of the accompanying color table on the darker side. The first layer and / or the second layer may also be white, particularly off-white or grayish white. It is preferred that the first layer is darker than the second layer.

[0026] It is preferred to use industrial plastic residues as the first plastic recycling material.

[0027] In a preferred embodiment, the first plastic recycling material and the first virgin plastic belong to the same plastics from the group of plastics of polyamide, polyolefin or thermoplastic elastomer. The first plastic recycling material and the first virgin plastic may preferably belong to an aliphatic polyamide-based system. The first plastic recycling material and the first virgin plastic may belong to a plastic grade of polypropylene. The first virgin plastic of the first plastic recycling material preferably belongs to a dynamically crosslinked thermoplastic elastomer-based system.

[0028] According to an advantageous embodiment, the tube has an additional layer. The additional layer contains a second virgin plastic. The second virgin plastic belongs to the same plastics, preferably the same plastic grade, particularly preferably the same plastic type as the first plastic recycling material. It is highly preferred that the first layer is arranged between the second layer and the additional layer. The first layer particularly preferably abuts against the additional layer. It is beneficial that the additional layer or the second virgin plastic shares at least one, preferably a plurality, particularly preferably all of the above-mentioned common features with the second layer or the first virgin plastic. The above arrangement is based on the finding that an optimal functionality is achieved by the three layers, and in this three-layer structure, a fairly large part is simultaneously composed of recycled plastic. In particular, the advantage of the arrangement of the three layers containing the second virgin plastic is that the first layer using the first plastic recycling material is protected by the two layers containing virgin plastic. For example, the first layer can ensure sufficient mechanical stability, and the second layer and the additional layer can chemically protect the first layer.

[0029] The tube may have a further layer containing a second plastic recycling material. The tube may have a second virgin layer, which preferably abuts the further layer. The second virgin layer preferably contains additional virgin plastic. It is particularly advantageous if the additional plastic belongs to the same plastics, preferably the same plastic grade, and particularly preferably the same plastic type as the second plastic recycling material. The plastics of the first plastic recycling material and the first virgin plastic are preferably selected from a number of plastics including polyamide, polyolefin, polyurethane, polymers containing vinyl alcohol, fluoropolymers, dynamically crosslinked thermoplastic elastomers, urethane-based thermoplastic elastomers, olefin-based thermoplastic elastomers. The second plastic recycling material may have one, a plurality or all of the aforementioned features of the first plastic recycling material. The additional virgin plastic or the second virgin plastic may have one, a plurality or all of the aforementioned features of the first virgin plastic or the second layer. The tube may have even more further layers. For example, these further layers may contain polyamide, polyolefin or other aforementioned plastics.

[0030] According to one embodiment, the adhesion promoting layer abuts the first layer. In particular, the adhesion promoting layer contains polyolefin. The adhesion promoting layer may be a mixed layer of the first layer and the additional plastic, and the additional plastic is a component of the layer in contact with the adhesion promoting layer. The adhesion promoting layer may contain an additive for improving adhesion. For example, the additive for improving adhesion is, for example, maleic anhydride, dimethyl maleate or acrylic acid.

[0031] The tube is preferably used in land vehicles, and particularly preferably used in road vehicles. The road vehicle is advantageously an electric vehicle. The tube is preferably used as cooling tube means. A tube which is preferred as cooling tube means is particularly advantageously used for cooling purposes inside an electric vehicle, in particular for cooling the battery of an electric vehicle. The tube can be used for the transport of fuel and / or brake fluid and / or hydrogen and / or aqueous urea solution and / or refrigerant for air conditioning.

[0032] Hereinafter, it will be described in more detail with reference to four exemplary embodiments schematically illustrated in four drawings.

Brief Description of the Drawings

[0033]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying out the Invention

[0034] FIG. 1 is a cross-sectional view of a tube 1 according to a first exemplary embodiment of the present invention. The tube 1 in this exemplary embodiment comprises a total of five layers. The first layer 2 contains a first plastic recycled material. The first plastic recycled material in this exemplary embodiment consists of PA12. The first layer 2 is surrounded by a second layer 3 containing a first virgin plastic. The first virgin plastic of the second layer 3 in this exemplary embodiment consists of PA12. The first layer 2 in this exemplary embodiment surrounds an adhesion promoting layer 7 for optimal adhesion to layer A2. For example, layer A2 contains polypropylene. Layer A2 partially surrounds the innermost layer A1. For example, the innermost layer A1 contains a thermoplastic elastomer.

[0035] In the second exemplary embodiment according to FIG. 2, the tube 1 has a first layer 2 containing a first plastic recycling material. The first plastic recycling material in this exemplary embodiment preferably consists of polypropylene, particularly preferably isotactic polypropylene. The tube 1 in the second exemplary embodiment has a second layer 3 containing a first virgin plastic. The first virgin plastic in this exemplary embodiment is preferably composed of polypropylene, particularly preferably isotactic polypropylene. In this exemplary embodiment, the second layer 3 is disposed on the outer periphery of the first layer 2, and the first layer 2 partially surrounds an additional layer 4. The additional layer 4 contains a second virgin plastic. The second virgin plastic in this exemplary embodiment consists of polypropylene, particularly isotactic polypropylene. The additional layer 4 preferably surrounds an innermost layer B1 containing a thermoplastic elastomer. The second layer 3 may be surrounded by a layer B2. The layer B2 in this exemplary embodiment may have an adhesion promoter. In this exemplary embodiment, the layer B2 is surrounded by an outermost layer B3. The layer B3 contains polyamide, particularly PA11 or PA12.

[0036] A third exemplary embodiment of the tube 1 shown in FIG. 3 consists of a total of five layers. The first layer 2 comprises a first plastic recycling material preferably made of polypropylene, particularly isotactic polypropylene. In the first example, the second layer 3 surrounds the first layer 2 and comprises a first virgin plastic. The first virgin plastic in this exemplary embodiment is made of polypropylene, particularly isotactic polypropylene. The second layer 3 is surrounded by a further layer 5. The further layer 5 preferably comprises a second plastic recycling material and, in this exemplary embodiment, consists of a dynamically crosslinked thermoplastic elastomer, preferably an EPDE / PP-based TPV. The further layer 5 is preferably surrounded by a second virgin layer 6. Advantageously, the second virgin layer 6 comprises an additional virgin layer made of a dynamically crosslinked thermoplastic elastomer, preferably an EPDM / PP-based TPV. In the exemplary third embodiment, the second virgin layer 6 forms the outermost layer of the tube 1. The first layer 2 may surround the innermost layer C1. For example, the innermost layer C1 may comprise a dynamically crosslinked thermoplastic elastomer.

[0037] Figure 4 shows a fourth exemplary embodiment of the present invention and depicts a cross-section of tube 1 having a total of six layers. The first layer 2 contains a first plastic recycling material, which in this exemplary embodiment includes a thermoplastic elastomer. For example, the thermoplastic elastomer of the first layer 2 is EPDM. In this exemplary embodiment, the first layer 2 surrounds the second layer 3, which is the innermost layer. The second layer 3 contains a first virgin plastic. The first virgin plastic is preferably a thermoplastic elastomer, particularly EPDM. In this exemplary embodiment, the first layer 2 is surrounded by an adhesion promoting layer 7, which is partially surrounded by a further layer 5. The further layer 5 preferably contains a second plastic recycling material. The second plastic recycling material preferably consists of a dynamically crosslinked thermoplastic elastomer. Advantageously, the further layer 5 is surrounded by a second virgin layer 6. The second virgin layer 6 may contain additional virgin plastic. The additional virgin plastic preferably consists of a dynamically crosslinked thermoplastic elastomer.

[0038] The exemplary embodiments listed are preferably applied to automobiles. The tube 1 in the four exemplary embodiments is particularly preferably used as a cooling tube for transporting coolant in an automobile. Particularly preferably, the cooling tube is used to cool the battery of an electric vehicle. For example, the cooling medium transported by the cooling tube is a water-glycol liquid.

Claims

1. Use of a first recycled plastic material for a tube (1) of a land vehicle, in particular a road vehicle, comprising: The tube (1) has a first layer (2) and a second layer (3), The first layer (2) and the second layer (3) abut against each other, The first layer (2) comprises a first recycled plastic material, said second layer (3) being made of a first virgin plastic; 4. The use according to claim 1, wherein the first plastic recycle and the first virgin plastic belong to the same plastics family, for example the polyamide or polyolefin plastics family.

2. 2. The use according to claim 1, characterized in that the first plastic recycle and the first virgin plastic belong to the same plastic grade.

3. 3. The use according to claim 1 or 2, characterized in that the ratio of the layer thickness of the first layer (2) to the total layer thickness of the first layer (2) and the second layer (3) together is at most 90%, 80% or 75%.

4. The use according to any one of claims 1 to 3, characterized in that the second layer (3) has a layer thickness of at most 0.5 mm, 0.4 mm or 0.35 mm.

5. 5. Use according to any one of the preceding claims, characterized in that the layer thickness of the first layer (2) is at least 10%, 15% or 20% of the total wall thickness of the tube (1).

6. 6. Use according to any one of the preceding claims, characterized in that the molar mass distribution of the first plastic recycle or of the first layer (2) is broader than the molar mass distribution of the first virgin plastic and / or of the second layer (3).

7. 7. Use according to any one of the preceding claims, characterized in that the weight percentage of the first plastic recycled material in the first layer (2) is at least 70%, 90% or 95%.

8. The use according to any one of the preceding claims, characterized in that the weight percentage of the first virgin plastic in the second layer (3) is at least 70%, 90% or 95%.

9. the first layer (2) has a darker color than the second layer (3); 9. Use according to any one of the preceding claims, characterized in that the first layer (2) preferably has a predetermined shade, in particular a grey shade, in the darker half, in particular the darker third, of the associated colour table.

10. 10. The use according to any one of claims 1 to 9, characterized in that the first plastic recycling material comprises industrial plastic residues.

11. The use according to any one of claims 1 to 10, characterized in that the first plastic recycled material and the first virgin plastic belong to the thermoplastic elastomer, polyamide or polyolefin family.

12. The tube (1) has an additional layer (4), said additional layer (4) comprising a second virgin plastic; The use according to any one of claims 1 to 11, characterized in that the second virgin plastic belongs to the same plastics family as the first plastic recycle.

13. The tube (1) has a further layer (5), Use according to any one of the preceding claims, characterized in that the further layer (5) comprises a second plastic recycle.

14. The tube (1) comprises a second virgin layer (6), Use according to any one of the preceding claims, characterized in that the second virgin layer (6) comprises additional virgin plastic.

15. The road vehicle is preferably an electric vehicle; Use according to any of the preceding claims, characterized in that the tube (1) is preferably a cooling tube means, in particular a cooling tube means for a battery of the electric vehicle.

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