Polyamide composite material with double or multiple layers

A composite material and polyamide technology, applied in the field of composite materials, can solve the problems of reduced interlayer adhesion, low heat resistance, and reduced

Inactive Publication Date: 2002-07-31
EVONIK DEGUSSA GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This rules out any solution including a polyolefin layer as such a layer would have too low a heat resistance
[0007] It has also been found that the interlayer adhesion between functionalized polyolefins and polyamides decreases rapidly with prolonged exposure to alcohol-containing fuels, especially in the presence of heat, and eventually the adhesion decreases to values ​​that are unacceptable for the industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0097] A Berstorff ZE25 twin-screw extruder was used to prepare a 6.1kg VESTAMID at 280°C  D22, 9.0kg ULTRAMID  An intimate mixture of B5W and 2.0 kg polyethyleneimine-PA6 copolymer was extruded, pelletized and dried.

[0098] A three-layer pipe with an outer diameter of 8 mm and a total wall thickness of 1 mm was co-extruded from the mixture. The outer layer of the pipe is made of VESTAMID  D22 composition; the middle layer is made of the mixture prepared at the beginning; the inner layer is made of ULTRAMID  B4 composition. At this point, permanent adhesion is achieved at both "phase boundaries".

example 2

[0100] Use Berstorff ZE25 twin-screw extruder to prepare a kind of VESTAMID by 8.1kg at 320 ℃  ZA7295 and 9.0kg ULTRAMID  An intimate mixture of B4 composition which is extruded, pelletized and dried. Here, some degree of amidation reaction was observed leading to the formation of block copolymers.

[0101] The mixture was used to produce a three-layer pipe with an external diameter of 8 mm and a total wall thickness of 1 mm. The outer layer of the pipe is made of VESTAMID  Composed of X7293; the middle layer is made of the mixture prepared at the beginning; the inner layer is made of ULTRAMID  B4 composition. At this point, permanent adhesion is achieved at both phase boundaries.

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Abstract

A good layer adhesion can be achieved in a composite having two or more layers wherein a layer I is obtained from a molding composition which has the following components: a) from 0 to 80 parts by weight of a polyamide selected from the group consisting of PA6, PA66, PA6/66 and a mixture thereof; b) from 0 to 100 parts by weight of a polyamine-polyamide copolymer; and c) from 0 to 80 parts by weight of a polyamide selected from the group consisting of PA11, PA12, PA612, PA1012, PA1212 and a mixture thereof; wherein a total of the parts by weight of components a), b) and c) is 100; wherein at least 20 parts by weight of components a) and b) is a monomer unit which is obtained from caprolactam and/or from a combination of hexamethylenediamine/adipic acid; and wherein at least 20 parts by weight of components b) and c) is a monomer unit which is obtained from omega-aminoundecanoic acid, laurolactam, a mixture of hexamethylenediamine and 1,12-dodecanedioic acid, a mixture of 1,10-decanediamine and 1,12-dodecanedioic acid, and/or a mixture of 1,12-dodecanediamine and 1,12-dodecanedioic acid.

Description

technical field [0001] The present invention relates to composite materials having two or more layers and comprising layers prepared from specific polyamide blends. Background technique [0002] In the development of composite materials with two or more layers, such as those used in motor vehicles for pipes conveying liquids or gases, the molding composition used must have sufficient resistance to chemical attack by the fluid being guided. capabilities, and they must also meet all the mechanical requirements placed on them, even after prolonged exposure to fuel, oil or heat. Molding compositions which have proven to be suitable in practice in this respect are polyamide-based composites. However, composite materials having two or more layers are not only subjected to various actions by the fluid being transported, but also to external actions. Examples of such effects, in the case of pipes laid in the chassis area of ​​motor vehicles, are the effects of atmospheric humidity...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/34C08L77/00C08L77/02C08L77/06C08L79/02
CPCB32B27/34C08L77/02C08L77/00C08L77/06Y10T428/13Y10T428/1352Y10T428/1386Y10T428/139Y10T428/1393Y10T428/31562Y10T428/31728Y10T428/31732
Inventor H·里斯G·施米茨H·海格
Owner EVONIK DEGUSSA GMBH
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