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Thermoplastic multilayer composites

A multi-layer composite material, thermoplastic technology, applied in the direction of rigid pipe, layered products, thin material processing, etc., can solve problems such as no mention, stress cracking, and reduced barrier effect

Inactive Publication Date: 2002-08-28
EMS CHEM AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0019] Multilayer composites with EVOH barrier layers are described in JP07-308 996, but it should be noted that these have the disadvantage of reduced barrier effect due to stress cracking in EVOH
However, there is no mention of the problem of insufficient adhesion between EVOH and PA12 or PA11

Method used

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Examples

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Embodiment Construction

[0055] Typically, fuel pipes for automobiles have dimensions of 8 x 1 mm, ie an outer diameter of 8 mm and a wall thickness of 1 mm. A preferred fuel line according to the invention is constructed, for example, as follows, but is not limited to this structure:

[0056] a: inner layer consisting of polyamide 6-based molding compound; 0.2-0.7 mm thick;

[0057] b: barrier and dissolution inhibiting layer consisting of a molding compound based on ethylene / vinyl alcohol copolymer; 0.1-0.3 mm thick,

[0058] c: Adhesion-promoting interlayer of molding compounds based on polyamides selected from copolyamide 6 / 12, block copolyamide 6 / 12, polyamide 612, polyamide 6 and blends of polyamide 12 with compatibilizer, and polyamide 610; 0.05-0.2 mm thick,

[0059] d: Outer layer consisting of polyamide 12-based molding compound; 0.2-0.7 mm thick.

[0060] When varying individual layer thicknesses in practice, care is generally taken to achieve total wall thicknesses of about 1 mm or slig...

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Abstract

A thermoplastic multilayer composite material, in particular in the form of a multilayer hose, multilayer tube or multilayer container, comprising a molded material based on ethylene / vinyl alcohol copolymer between layers obtained from a molding compound based on polyamide At least one intermediate layer made of plastic, which is adhered via at least one adhesion-promoting layer made of polyamide-based molding compound On at least one adjacent layer made of a molding compound of polyamide 1212, the polyamide of the adhesion-promoting layer is selected from copolyamide 6 / 12, block copolyamide 6 / 12, polyamide 612, polyamide 610, polyamide Mixture of polyamide 6 and polyamide 12 with compatibilizer, mixture of polyamide 6 and polyamide 11 with compatibilizer.

Description

technical field [0001] The present invention relates to thermoplastic multilayer composites comprising at least one layer of molding material based on ethylene / vinyl alcohol copolymer and multiple layers of molding material based on polyamide, in particular in the form of multilayer hoses, multilayer pipes, more particularly Fuel lines, or multilayer containers, and methods for their production. [0002] In particular, the invention relates to hoses or pipes for gaseous or liquid media which consist of a plurality of polymer layers and which exhibit an improved barrier effect on fuels. These fuels also contain alcohol components. The multilayer tubing for automobiles according to the invention is therefore also relevant for the conduction of alcoholic media. These pipes should be alcohol-resistant, which means that the plastic pipes will not elongate disturbingly when transporting alcohol-containing fuels. Such conduits are considered suitable for conducting premium gasolin...

Claims

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Application Information

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IPC IPC(8): B60K15/01B32B1/08B32B27/28B32B27/30B32B27/34C08L77/02F16L9/12F16L11/04F16L11/127
CPCB32B1/08B32B27/30B32B27/34F16L9/123F16L11/045F16L2011/047Y10S138/01Y10S138/07Y10T428/1352Y10T428/1379Y10T428/1383Y10T428/1393Y10T428/31504Y10T428/31725Y10T428/31732Y10T428/31746
Inventor 阿尔伯特·菲利普迈克尔·赫夫曼
Owner EMS CHEM AG
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