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Multi-layer hose

A hose and inner layer technology, applied in the direction of hoses, pipes, layered products, etc., can solve the problems of poor bonding performance, no bonding strength, and insufficient bonding strength and durability of fluorinated resins

Inactive Publication Date: 2007-08-22
ASAHI GLASS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] So far, the production of multi-layer hoses with a multilayer structure of fluorinated resin as the inner layer and polyamide resin as the outer layer has the following problems: the adhesive performance of the fluorinated resin itself is poor, and even when the fluorinated resin is made into a hose or film directly Covered on the base material with polyamide resin as the outer layer, there is no sufficient adhesive strength
Also, if the hose is exposed to or soaked in fuel for a long time, the durability of adhesion strength between layers (hereinafter referred to as "oil resistance") is inevitably insufficient in some cases

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0181] (PA-1) Preparation of polyamide 12

[0182] Add 20 kg of omega-laurolactam, 0.5 kg of water and 49.3 g of isophoronediamine (1 / 350 eq / mol lauryl lactam) into a 70-liter autoclave, and flush the autoclave with nitrogen . Then the temperature inside the kettle was raised to 260° C., the internal pressure was adjusted to 3.5 MPa, and the polymerization reaction was carried out for 2 hours under stirring. Subsequently, the pressure was returned to normal pressure, and after being maintained for 2 hours, the pressure was reduced to 0.05 MPa, and the polymerization reaction was carried out under reduced pressure for 4 hours. Nitrogen gas is introduced into the autoclave, and the pressure returns to normal pressure. The polymer is taken out from the outlet at the bottom of the reactor in bundle form, cut into granules, and dried under reduced pressure.

[0183] The relative viscosity of the obtained polymer was 2.26, the amino end group concentration was 47 μeq / g, and the ...

preparation example 2

[0185] (PA-2) Preparation of polyamide 12

[0186] Synthesize (PA-2) polyamide 12 with the method of Preparation Example 1, but wherein 49.3 grams of isophorone diamine (1 / 350eq / mol laurolactam) in Preparation Example 1 is replaced with 17.6 grams of 1,6-hexylene For diamine (1 / 670eq / mol lauryl lactam), the reduced pressure is changed from 0.05MPa to 0.08MPa.

[0187] The relative viscosity of the obtained polymer is 2.30, the amino end group concentration concentration is 38 μ eq / g, and the carboxyl end group concentration concentration is 20 eq / g (hereinafter, this polyamide 12 is referred to as "(PA-2) polyamide 12 ” or simply “(PA-2)”). (Amino terminal group concentration) / (Carboxyl terminal group concentration)=1.9>1.

preparation example 3

[0189] (PA-3) Preparation of polyamide 12

[0190] Synthesize (PA-3) polyamide 12 with preparation example 1 method, but wherein in preparation example 1, 49.3 gram isophorone diamines (1 / 350eq / mol lauryl lactam) are changed into 28.8 gram stearic acid (1 / 1,000eq / mol lauryl lactam), the decompression pressure is changed from 0.05MPa to 0.08MPa.

[0191] The relative viscosity of the obtained polymer is 2.25, the amino end group concentration concentration is 27 μeq / g, and the carboxyl end group concentration concentration is 35 μeq / g (hereinafter, this polyamide 12 is referred to as "(PA-3) polyamide 12 ” or simply “(PA-3)”). (Amino terminal group concentration) / (Carboxyl terminal group concentration)=0.77>1.

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Abstract

A multi-layer hose having a multi-layer structure comprising an inner layer (I) made of a fluorocopolymer and an outer layer (II) made of a polyamide resin, wherein the fluorocopolymer constituting the inner layer (I) is a fluorocopolymer which comprises polymerized units (a) based on tetrafluoroethylene, polymerized units (b) based on ethylene and polymerized units (c) based on itaconic anhydride and / or citraconic anhydride, wherein the molar ratio of (a) / (b) is from 20 / 80 to 80 / 20 and the molar ratio of (c) / ((a)+(b)) is from 1 / 10,000 to 5 / 100 and which has a volume flow rate of from 1 to 1,000 mm<3> / sec., and the polyamide resin constituting the outer layer (II) is polyamide 11 and / or polyamide 12, which satisfies a condition of (terminal amino group concentration) / (terminal carboxyl group concentration)>1.

Description

technical field [0001] The present invention relates to a multilayer hose which is excellent in interlayer adhesive strength, fuel barrier properties, and which exhibits oil resistance over a long period of time due to its excellent interlayer adhesive strength. Background technique [0002] Due to the problem of antifreeze corrosion on roads in the past and the urgent need for energy conservation to prevent global warming in recent years, the main base material of conveying hoses for automobiles has changed from metal to resin with light weight and excellent corrosion resistance. The resins used for conveying hoses are usually polyamide resins, saturated polyester resins, polyolefin resins or thermoplastic polyurethane resins. However, the heat resistance, chemical resistance, etc. properties of a single-layer hose made of these materials are insufficient, and thus its application range is rather limited. [0003] On the other hand, fluorinated resins have excellent heat r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B1/08B32B27/28B60K15/01B32B27/30B32B27/34C08F259/08C08L51/00F16L11/04F16L11/11F16L11/127F16L11/15
CPCC08F259/08B32B27/28F16L11/15B32B1/08F16L11/127C08L51/003Y10T428/1317Y10T428/139Y10T428/1393C08L2666/02B32B27/08B32B27/34B32B2270/00B32B2323/043B32B2323/046B32B2367/00B32B2398/20B32B2597/00
Inventor 船木笃鹫见直子西栄一矶部典之西冈群晴中村孝治
Owner ASAHI GLASS CO LTD
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