MULTILAYER MOTOR VEHICLE PIPELINE

Abstract

Multilayer motor vehicle tube for conducting at least one fluid medium, wherein the tube comprises a fluid duct and a tube wall that surrounds the fluid duct. The tube wall is multilayered and comprises at least three layers, specifically having the following layer composition. An external layer is provided that consists of at least one polyamide, in particular of at least one aliphatic polyamide. Furthermore, an adhesion-promoting layer is provided and an internal layer consisting of at least one thermoplastic elastomer. At least one barrier layer is also provided that consists of at least 96% by weight of polypropylene. The overall layer thickness d of the tube wall is from 0.3 to 3.0 mm.

Claims

1. A multi-layer motor vehicle tube for conducting at least one fluid medium, the multi-layer tube having a fluid channel and a tube wall that surrounds the fluid channel, the tube wall comprising the following layer structure from the outside to the inside: an outer layer made from at least one polyamide, an adhesion promoter layer, an inner layer consisting of at least 90 wt. % of a thermoplastic elastomer, and at least one barrier layer, the barrier layer consisting of at least 96% by weight of polypropylene; the barrier layer forming an internal layer for the multi-layer tube, such that the barrier layer adjoins the inner layer and is exposed to the at least one fluid medium, wherein the overall layer thickness (d) of the tube wall ranges from 0.3 to 3.0 mm.

2. The multi-layer tube according to claim 1, wherein the outer layer consists essentially of at least one polyamide selected from the group polyamide 6, polyamide 10, polyamide 11, polyamide 12, and a combination thereof.

3. The multi-layer tube according to claim 1, wherein the thermoplastic elastomer is based on ethylene-propylene-diene rubber (EPDM), butyl rubber, chlorobutyl rubber, styrene-butadiene rubber, nitrile rubber, nitrile-butadiene rubber, or a combination thereof.

4. The multi-layer tube according to claim 1, wherein the adhesion-promoting layer is based on at least one polyolefin.

5. The multi-layer tube according to claim 1, wherein the multi-layer tube further comprises an external layer that adjoins the outer layer on the outside; the external layer being based on at least one polyamide.

6. The multi-layer tube according to claim 5, wherein the layer thickness of the external layer is 5% to 20% of the total layer thickness (d) of the tube wall.

7. The multi-layer tube according to claim 1, wherein the layer thickness of the barrier layer is 10% to 60% of the total layer thickness d of the tube wall.

8. The multi-layer tube according to claim 1, wherein the layer thickness of the outer layer is 10% to 40% of the total layer thickness d of the tube wall.

9. The multi-layer tube according to claim 1, wherein the layer thickness of the adhesion promoter layer is 2% to 15% of the total layer thickness d of the tube wall.

10. The multi-layer tube according to claim 1, wherein the layer thickness of the inner layer is 5% to 20% of the total layer thickness d of the tube wall.

11. The multi-layer tube according to claim 1, wherein the outer layer has a greater layer thickness than the adhesion-promoting layer.

12. The multi-layer tube according to claim 1, wherein the barrier layer has a greater layer thickness than the inner layer.

13. The multi-layer tube according to claim 1, wherein the at least one polyamide comprises an aliphatic polyamide.

14. The multi-layer tube according to claim 1, wherein the overall layer thickness (d) of the tube wall ranges 0.5 to 2.5 mm.

15. The multi-layer tube according to claim 14, wherein the overall layer thickness (d) of the tube wall ranges from 0.75 to 2.0 mm.

16. The multi-layer tube according to claim 1, wherein the at least one polyamide comprises polyamide 6, the thermoplastic elastomer is based on ethylene-propylene-diene rubber (EPDM); and the adhesion promoting layer is based on polypropylene.

17. The multi-layer tube according to claim 5, wherein the polyamide of the external layer is based on at least one selected from the group of polyamide 6.12, polyamide 6.6, polyamide 6.10, and polyamide 6.16.

18. The multi-layer tube according to claim 17, wherein the at least one polyamide is based on polyamide 6.12.

19. The multi-layer tube according to claim 6, wherein the layer thickness of the external layer is 10% to 15% of the total layer thickness (d) of the tube wall.

20. The multi-layer tube according to claim 1, wherein the layer thickness of the outer layer is 10% to 20%; the layer thickness of the adhesion promoter layer is 7% to 15%; the layer thickness of the inner layer is 7% to 15%; and the layer thickness of the barrier layer is 15% to 50% of the total layer thickness d of the tube wall.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The disclosure will be explained in more detail in the following on the basis of a set of drawings showing just one embodiment, in which:

[0034] FIG. 1 is a schematic perspective view of a motor vehicle tube according to the disclosure, and

[0035] FIG. 2 is a schematic sectional view through the object according to FIG. 1.

DETAILED DESCRIPTION

[0036] The drawings show a multilayer motor vehicle tube 1 according to the disclosure. In the embodiment according to the drawings, this tube 1 may be a temperature-control tube, in particular a cooling tube for temperature-control circuits or cooling circuits in a motor vehicle. According to the disclosure, the tube 1 comprises a fluid duct 2 and a tube wall 3 that surrounds the fluid duct 2. By means of the tube 1, a fluid medium, in particular a fluid temperature-control medium or cooling medium that is not shown in more detail in the drawings, is guided in the fluid duct 2. According to recommendations and in the embodiment according to the drawings, the tube wall 3 is multilayered and comprises five layers. From the outside in, these five layers are an outer layer 7, an external layer 4, an adhesion-promoting layer 5, an internal layer 6 and a barrier layer 8. In this embodiment according to the drawings, the barrier layer 8 forms an inner layer of the tube 1, which, as per recommendations and in the embodiment, is connected to the internal layer 6 towards the inside. According to an alternative embodiment of the disclosure that is not shown in the drawings, the barrier layer 8 follows the adhesion-promoting layer 5 first and then the internal layer 6.

[0037] According to one embodiment, the final layer of the tube 1 towards the inside—preferably and in the embodiment the barrier layer 8—can comprise conductivity additives so as to make them electrically conductive. If, according to an alternative variant that is not shown in the drawings, the internal layer 6 forms the final layer of the tube 1 towards the inside, the internal layer 6 can comprise conductivity additives.

[0038] Expediently and in the embodiment, the outer layer 7 substantially consists of an aliphatic polyamide, preferably of Nylon 6/12. The outer layer 7 can also contain additives. According to recommendations and in the embodiment, the outer layer 7 consists of up to at least 95 wt. % of Nylon 6/12. Furthermore, an external layer 4 is provided, which preferably and in the embodiment according to the drawings is connected to the outer layer 7 towards the inside. According to a preferred embodiment and in the embodiment, the external layer 4 substantially consists of Nylon 6 and can also comprise additives, wherein the external layer 4 expediently and in the embodiment consists of up to at least 95 wt. % of Nylon 6.

[0039] According to the disclosure, an adhesion-promoting layer 5 is provided that is preferably based on polypropylene. According to recommendations and in the embodiment, the adhesion-promoting layer 5 is connected to the internal layer 4 towards the inside. Expediently and in the embodiment, the adhesion-promoting layer 5 substantially consists of polypropylene and can also contain additives. In the embodiment, the adhesion-promoting layer 5 may consist of up to at least 95 wt. % of polypropylene.

[0040] According to the disclosure, an internal layer 6 consisting of at least one thermoplastic elastomer is provided. The internal layer 6 is expediently connected to the adhesion-promoting layer 5 towards the inside. According to recommendations and in the embodiment, the thermoplastic elastomer of the internal layer 6 is based on ethylene propylene diene rubber (EPDM). Preferably and in the embodiment, the thermoplastic elastomer of the internal layer 6 is a thermoplastic vulcanizate based on EPDM and the internal layer 6 very particularly preferably substantially consists of the thermoplastic vulcanizate and can also contain additives. In this connection, it is particularly preferable for the internal layer 6 to consist of up to at least 95 wt. % of the thermoplastic elastomer or the thermoplastic vulcanizate based on EPDM.

[0041] Expediently and in the embodiment, a barrier layer 8 is connected to the internal layer 6 towards the inside. The barrier layer 8 then quasi forms an inner layer of the tube 1. The barrier layer 8 or the inner layer is preferably and in the embodiment in direct contact with the fluid temperature-control medium guided in the fluid duct 2. According to recommendations, the barrier layer 8 substantially consists of polypropylene. The barrier layer 8 can contain additional additives. Preferably and in the embodiment, the barrier layer 8 consists of up to at least 95 wt. % polypropylene.

[0042] The overall layer thickness d of the tube wall 3 of the tube 1 is expediently from 0.5 to 2.5 mm, preferably from 0.6 to 2.2 mm and particular preferably from 0.75 to 2.0 mm. According to recommendations and in the embodiment, the outer layer 7 has a greater layer thickness than the adhesion-promoting layer 5. Preferably and in the layered composite shown in the drawings, the adhesion-promoting layer 5 is the layer having the smallest layer thickness. Therefore, expediently and in the embodiment, the outer layer 7 and the external layer 4 and the internal layer 6 and the barrier layer 8 are each thicker than the adhesion-promoting layer 5. Within the context of the disclosure and in the embodiment, the barrier layer 8 also has a greater layer thickness than the internal layer 6.