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Multilayer tubular structure having improved resistance to extraction in biogasoline and use thereof

A structure and application technology, applied in the field of multi-layer structures, can solve problems such as positioning and leakage

Active Publication Date: 2020-10-02
ARKEMA FRANCE SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] - Excessive swelling (swelling) of the tube after aging in gasoline / diesel systems (including those used for biodiesel or biogasoline), which can lead to leaks or Problems positioning under vehicles

Method used

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  • Multilayer tubular structure having improved resistance to extraction in biogasoline and use thereof

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Embodiment

[0158] The invention will now be described in more detail with the aid of the following non-limiting examples.

[0159] The following structures were prepared by extrusion:

[0160] Multilayer tubes are produced by coextrusion. A McNeil multilayer extrusion production (industrial) line equipped with 5 extruders connected with a screw mandrel to a multilayer extrusion head was used.

[0161] The screw used was a single extrusion screw with a screw profile (profile) suitable for polyamides. In addition to 5 extruders and multilayer extrusion heads, the extrusion line includes:

[0162] A die-punch assembly at the end of the coextrusion head; the inner diameter of the die and the outer diameter of the punch as a function of the structure to be made and the material of which it is made, but also as the dimensions and wires of the pipes Selected as a function of velocity;

[0163] • Vacuum tank (tank) with adjustable vacuum. In this tank, water kept substantially at 20° C. is ...

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Abstract

The present invention relates to a multilayer tubular structure (MLT) for conveying fluids, in particular gasoline, comprising, from the innermost to the outermost layer, at least one inner barrier layer (1) and at least one outer layer (2) located above the barrier layer, said outer layer (2) or the set of layers (2) and of any other layers located above the barrier layer containing on average 0to 5% of a plasticiser relative to the total weight of the composition of the layer (2), or the set of outer layers located above the barrier layer comprising on average 0 to 5% of a plasticiser, saidouter layer (2) predominantly comprising at least one aliphatic polyamide or a polyamide consisting of more than 75% aliphatic units.

Description

[0001] This application is based on a Chinese patent application dated January 12, 2017, application number 201780001029.3, and the title of the invention is "Multilayer tubular structure with improved resistance to extraction from biogasoline and its use" case application. technical field [0002] The present invention relates to multilayer structures, in particular in the form of tubes, and their use for conveying fluids, in particular gasoline-type fuels, in particular alcohol-containing gasolines, in particular for motor vehicles. [0003] The invention relates more particularly to the tubes present in the engine. These pipes may, for example, be intended for conveying fuel, in particular between the tank and the engine, for cooling circuits, for hydraulic systems, or for air conditioning circuits or for conveying urea / water mixtures. Background technique [0004] For the delivery of gasoline and in particular biogasoline, a number of criteria must be met, in particular...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B1/08B32B27/34B32B27/22B32B27/06B32B33/00B32B27/32F16L11/04F16L11/12
CPCB32B1/08B32B27/34B32B27/22B32B27/06B32B33/00B32B27/322B32B27/32F16L11/04F16L11/12B32B27/08B32B27/18B32B2307/7265B32B2597/00B32B2605/08Y10T428/1393
Inventor T.蒙塔纳里C.雷科奎尔B.维尔鲍乌赫德
Owner ARKEMA FRANCE SA
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