CN1406739A

CN1406739A - Automative fuel pipeline made by co-injection process

Info

Publication number: CN1406739A
Application number: CN 01137610
Authority: CN
Inventors: 沃纳·齐默尔; 库特·阿佩尔; 索斯滕·奥托
Original assignee: TI Group Automotive Systems Fuldabruck GmbH
Current assignee: TI Group Automotive Systems Fuldabruck GmbH
Priority date: 2001-09-06
Filing date: 2001-09-06
Publication date: 2003-04-02
Anticipated expiration: 2021-09-06
Also published as: CN1259185C

Abstract

An oil tube made up by co-extruding out for car is composed of external layer made of polyamide, central layer made of ethylene-ethanol, copolymer, and internal layer made of polyamide and electrically conductive carbon black or graphite fibre (30%).

Description

The automobile pipeline of the usefulness of making by coextrusion such as oil plant

The present invention relates to automobile pipeline such as oil plant of making by coextrusion, it has the skin that is made of polyamide 12, the intermediate layer that is made of ethylene-vinyl alcohol copolymer and the internal layer that is made of polyamide such as polyamide 6.

DE4001125C1 discloses this automobile pipeline, and wherein barrier layer is permeated as hydrocarbon in the intermediate layer, and inner tube layer does not allow static on the area by the fluid that flows through.In addition, not ability zinc chloride (ZnCL) corrosion of its internal layer so just can not be used the connector that contains zinc, and this is because because quick aging such as stress corrosion make pipeline may occur damaging.

Following content is disclosed in the 1110th page the-the 1113rd page of Roempp chemistry encyclopaedia dictionary second volume published of Georg Thieme publishing house of nineteen ninety the 9th edition Stuttgart, promptly under the natural stability state, will sneak in the non-conductive polymer in conductive additive such as carbon black or the carbon fiber-containing and make it have electric conductivity.Yet this conducting polymer is in too crisp and extensibility difference always and can not satisfy above-mentioned instructions for use.

The automobile pipeline that the purpose of this invention is to provide a kind of the above-mentioned type, it has conduction and internal layer preferably also anti-zinc chloride (ZnCL) corrosion.

Solution of the present invention is, in the polyamide 6 of internal layer, add percentage by weight and mostly be the carbon black or the graphite fibre of 30% conduction most, so that it can conduct electricity and anti-zinc chloride (ZnCL) corrosion, or the polyamide of internal layer is to make its conductive polyamide 12 by adding carbon black or the graphite fibre that percentage by weight mostly is 30% conduction most.

Here, the present invention is based on following understanding, promptly in polyamide 6, add percentage by weight and mostly be the carbon black of 30% conduction or graphite fibre most satisfying the instructions for use of conduction and also anti-to a certain extent zinc chloride (ZnCL) corrosion, and can not influence its ductility.If to having relatively high expectations of anti-zinc chloride (ZnCL) corrosion, then suggestion adds other corresponding additive.Correspondingly, also be suitable for polyamide 12, it has certain anti-zinc chloride (ZnCL) corrosivity under nature.

According to preferred embodiment, between the outer and intermediate layer that constitutes by ethylene-vinyl alcohol copolymer and/or the intermediate layer and internal layer that constitute by ethylene-vinyl alcohol copolymer, add by polyamide 6, mostly be the carbon black of 30% conduction or the extra play that graphite fibre constitutes its conductive polyamide 6 or polyamide 6-compound most by adding percentage by weight.In addition,, can advise adopting such setting, promptly between outer and contiguous intermediate layer or extra play and/or internal layer and contiguous intermediate layer or extra play, bonding coating is set respectively for the relatively poor polymer of being attached to each other property.The bonding coating that is fit to comprises the polyolefin with functional group, particularly based on the polyolefin of polyethylene or polypropylene.When polyamide 12 is used as internal layer, between internal layer and outer bonding coating thereof, nonconducting polyamide 12 extra plays have been added.

Total wall thickness of automobile pipeline is 0.8-2.0mm.Preferred automobile pipeline is characterised in that: the wall thickness in zone is the 30%-60% of total wall thickness outside the intermediate layer, and the wall thickness in intermediate layer is that the wall thickness in zone within the 5%-25%, intermediate layer of total wall thickness is the 25%-55% of total wall thickness.

Below, further describe the present invention with reference to accompanying drawing.Fig. 1-Fig. 5 shows the schematic cross-sectional view that the oil plant of making by coextrusion of the present invention is used four embodiment of automobile pipeline.

In all four embodiment, the automobile pipeline have the skin 1 that constitutes by polyamide 12 (PA12), constitute by ethylene-vinyl alcohol copolymer (EVAL) and as the intermediate layer 2 of hydrocarbon infiltration barrier layer and the internal layer 3 that constitutes by polyamide, and in Fig. 1-Fig. 3 by polyamide 6 (PA6 ^*) make with Fig. 4,5 in by polyamide 12 (PA12 ^*) make, wherein add percentage by weight and mostly be 30% conductive carbon black or graphite fibre most, also can anti-zinc chloride (ZnCL) corrosion thereby it can be conducted electricity.

According to the embodiment of Fig. 1, outer 1 and intermediate layer 2 between, add from outside to inside bonding coating (HV) 4 and by with inner layer material identical materials (PA6 ^*) extra play 5 that constitutes.In the embodiment of Fig. 2, between skin 1 and intermediate layer 2 and between intermediate layer 2 and internal layer 3, add the extra play 5 that constitutes by polyamide 6-compound (PA6C).In the embodiments of figure 3, between skin 1 and intermediate layer 2, the extra play 5 that adds bonding coating (HV) 4 from outside to inside and be made of polyamide 6 in addition, is provided with the extra play 5 of another polyamide 6 between intermediate layer 2 and internal layer 3.At last, in the embodiment of Fig. 4, outer 1 and intermediate layer 2 between and between intermediate layer 2 and internal layer 3, connect bonding coating 4 respectively.The formation of the automobile pipeline among Fig. 5 and the difference of Fig. 4 be, between internal layer 3 and outer bonding coating thereof, adds nonconducting polyamide 12 extra plays 6.

The thickness of each layer is provided by following table:

Fig. 1	Fig. 2	Fig. 3	Fig. 4	Fig. 5
Fig. 1	Fig. 2	Fig. 3	Fig. 4	Fig. 5	?0.3mm?PA12	?0.3mm?PA12	?0.3mm?PA12	?0.40mm?PA12	?0.35mm?PA12
?0.05mm?HV		?0.05mm?HV	?0.05mm?HV	?0.05mm?HV	?0.3mm?PA12	?0.3mm?PA12	?0.3mm?PA12	?0.40mm?PA12	?0.35mm?PA12
?0.05mm?HV		?0.05mm?HV	?0.05mm?HV	?0.05mm?HV	?0.05mm?PA6*	?0.10mm?PA6C	?0.05mm?PA6
?0.15mm?EVAL	?0.15mm?EAVL	?0.15mm?EAVL	?0.15mm?EAVL	?0.15mm?EAVL	?0.05mm?PA6*	?0.10mm?PA6C	?0.05mm?PA6
?0.15mm?EVAL	?0.15mm?EAVL	?0.15mm?EAVL	?0.15mm?EAVL	?0.15mm?EAVL		?0.35mm?PA6C	?0.35mm?PA6	?0.30mm?HV	?0.05mm?HV
				?0.30mm?PA12		?0.35mm?PA6C	?0.35mm?PA6	?0.30mm?HV	?0.05mm?HV
				?0.30mm?PA12	?0.45mm?PA6*	?0.10mm?PA6*	?0.10mm?PA6*	?0.10mm?PA12*	?0.10mm?PA12*

Claims

1. automobile pipeline such as oil plant of making by coextrusion, it has the skin (1) that is made of polyamide 12, the intermediate layer (2) that is made of ethylene-vinyl alcohol copolymer and the internal layer (3) that is made of polyamide 6, it is characterized in that: in the polyamide 6 of internal layer (3), add percentage by weight and mostly be 30% conductive carbon black or graphite fibre most and it can be conducted electricity.

2. automobile pipeline as claimed in claim 1 is characterized in that: the polyamide 6 of internal layer (3) can anti-zinc chloride (ZnCL) corrosion.

3. make automobile pipeline such as oil plant by coextrusion for one kind, it has the skin (1) that is made of polyamide 12, the intermediate layer (2) that is made of ethylene-vinyl alcohol copolymer and the internal layer (3) that is made of polyamide, it is characterized in that: the polyamide 12 of internal layer (3) is mostly to be 30% conductive carbon black or graphite fibre most and to make its conductive polyamide 12 by adding percentage by weight.

4, as the described automobile pipeline of one of claim 1-3, it is characterized in that: constitute intermediate layer (2) in outer (1) with by ethylene-vinyl alcohol copolymer and/or constitute between intermediate layer (2) and the internal layer (3), add by polyamide 6 respectively, mostly be the extra play (5) that 30% conductive carbon black or graphite fibre constitute its conductive polyamide 6 or polyamide 6-compound most by the adding percentage by weight by ethylene-vinyl alcohol copolymer.

5, as the described automobile pipeline of one of claim 1-4, it is characterized in that: at outer (1) and contiguous intermediate layer or extra play (2; 5) and/or internal layer (3) and contiguous intermediate layer or extra play (2; 5) between, bonding coating (4) is set respectively.

6, automobile pipeline as claimed in claim 5 is characterized in that: between internal layer (3) and outer bonding coating (4), add nonconducting polyamide 12 extra plays (6).

7, as claim 5 or 6 described automobile pipelines, it is characterized in that: bonding coating (4) comprises the polyolefin with functional group.

8, automobile pipeline as claimed in claim 7, it is characterized in that: described polyolefin comprises polyethylene or polypropylene as base material ground.

9, as the described automobile pipeline of one of claim 1-8, it is characterized in that: total wall thickness is 0.8mm-2.0mm.

10, as the automobile pipeline of one of claim 1-9, it is characterized in that: the wall thickness in zone is 30% to 60% of total wall thickness outside intermediate layer (2), the wall thickness of intermediate layer (2) be total wall thickness 5% to 25%, the wall thickness in zone is 25% to 55% of total wall thickness within intermediate layer (2).