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Multilayer tube for transporting water or gas

A multi-layer tube and barrier layer technology, applied in the field of multi-layer tubes, can solve problems such as functionalized fluoropolymers not mentioned

Inactive Publication Date: 2009-11-18
ARKEMA FRANCE SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Functionalized fluoropolymers obtained by radiation grafting are not mentioned in this document

Method used

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  • Multilayer tube for transporting water or gas
  • Multilayer tube for transporting water or gas
  • Multilayer tube for transporting water or gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0251] Embodiment 1: the preparation of functionalized PVDF

[0252] PVDF-1 was compounded with 2% by weight of maleic anhydride in a Weruer 40 type extruder at 190°C. The compounding is carried out under the following conditions: all outlets of the extruder are closed, the screw speed is 200 rpm and the throughput is 60 kg / h.

[0253] The product pelletized by the die face pelletizer was placed into bags with an impermeable aluminum liner. The bag was irradiated at 20 kGray. After irradiation, the product was passed through the extruder again at 245°C, maximum vacuum and 200 rpm. Throughput is 25kg / h. Infrared analysis of the product was carried out after this devolatilization step and showed: a degree of grafting of 0.31% and a content of free maleic anhydride of 300 ppm. This product is called functionalized PVDF 1 .

Embodiment 2

[0254] Embodiment 2: the preparation of functionalized PVDF

[0255] Repeat the conditions of Example 1, but with 720 replaces PVDF-1. Infrared analysis of the product after devolatilization showed a degree of grafting of 0.50% and a free maleic anhydride content of 300 ppm. This product is called functionalized PVDF 2 .

Embodiment 3

[0256] Embodiment 3 (comparative example)

[0257] A multilayer tube (outer diameter: 14mm) was produced using a McNeil extruder, the multilayer tube having the following structure:

[0258] 720(130μm) / functionalized PVDF 2(50μm) / AX8840(50μm) / PEX(780μm).

[0259] The PEX layer is the outer layer. All layers are adhered to each other. Extrude at 40m / min under the following conditions:

[0260] ·PE layer: 230℃

[0261] · AX8840: 250°C

[0262] ·Functionalized PVDF: 250℃

[0263] · 720: 250°C.

[0264] layer ensures excellent chemical protection of the PEX layer. After 5 days of extrusion, the functionalized PVDF and The adhesion between the 8840 layers was 10 N / cm. The adhesion is of the cohesive failure type.

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Abstract

The invention relates to a multilayer tube comprising (in the order starting from the inside to the outside of the tube) layers arranged one on top of the other: an optional layer L1 comprising at least one fluorinated polymer, preferably a PVDF; a layer L2 comprising at least one functionalized PVDF, obtained by radiation grafting of at least one unsaturated polar monomer onto a PVDF; an optional layer L3 of an adhesive binder; a layer L4 comprising at least one polyolefin optionally mixed with at least one functionalized polyolefin; an optional barrier layer L5; an optional layer L6 comprising at least polyolefin, optionally in a mixture with at least one functionalized polyolefin; characterized in that the PVDF onto which the unsaturated polar monomer is grafted is a VDF copolymer whose weight content is at least 50%, preferably at least 75% and at least one monomer copolymerisable with the VDF, having the following characteristics: a crystallization temperature Tc (measured by DSCas per the ISO Standard 11357-3) ranging from 50 to 120 DEG C, preferably from 85 to 110 DEG C; a constraint to the Theta Y threshold ranging from 10 to 40 MPa, preferably from 10 to 30 MPa; a viscosity Eta in the molten state (measured with a capillary rheometer at 230 DEG C at 100 s<-1>) ranging from 100 to 1,500 Pa s, preferably from 400 to 1200 Pa s.

Description

technical field [0001] The invention relates to a multilayer pipe comprising a polyolefin layer and a layer of functionalized PVDF obtained by radiation grafting on PVDF at least one unsaturated monomer. The polyolefin may be polyethylene, especially high density polyethylene (HDPE) or crosslinked polyethylene (denoted PEX). The pipe can be used to transport liquids (especially hot water) or gases. The invention also relates to the use of this tube. [0002] technical problem to be solved [0003] Steel or cast iron pipes are increasingly being replaced by equivalents made of plastic. Polyolefins, especially polyethylene, are widely used thermoplastic materials because they exhibit good mechanical properties, are easy to convert and can be easily bonded to each other. Polyolefins are widely used in the manufacture of pipes for transporting water or city gas. Polyolefins must be mechanically resistant to the stresses imposed by the pressurized gas when the gas is under hig...

Claims

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Application Information

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IPC IPC(8): B32B27/30B32B1/08F24D3/14B32B27/32C08L27/12F16L11/04
CPCC08L27/12B32B1/08F24D3/146B32B27/32B32B27/30Y02B30/00Y02P20/10C08L2666/24
Inventor 安东尼·邦尼特奥德·拉普兰德帕斯卡尔·塞比尔
Owner ARKEMA FRANCE SA
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