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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

Active Publication Date: 2004-10-06
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

[0180] (PA-1) Preparation of polyamide 12

[0181] In a 70-liter autoclave, 20 kg of ω-laurolactam, 0.5 kg of water and 49.3 g of isophorone diamine (1 / 350 eq / mol lauryl lactam) were added, and the autoclave was flushed with nitrogen. Then the temperature in the kettle was raised to 260°C, the inner 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 maintaining 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 is introduced into the autoclave, the pressure is restored to normal pressure, the polymer is taken out from the outlet at the bottom of the reactor in a bundle of polymer, cut into pellets, and dried under reduced pressure.

[0182] The relative viscosity of the prepared polymer was 2.26, the amino end group concentration was 47 μeq / g, and the carboxyl ...

preparation example 2

[0184] (PA-2) Preparation of polyamide 12

[0185] (PA-2) polyamide 12 was synthesized by the method of Preparation Example 1, but 49.3 g of isophorone diamine (1 / 350eq / mol laurolactam) in Preparation Example 1 was replaced with 17.6 g of 1,6-hexylene Diamine (1 / 670eq / mol lauryl lactam), the reduced pressure of 0.05MPa is changed to 0.08MPa.

[0186] The relative viscosity of the prepared polymer was 2.30, the amino end group concentration was 38 μeq / g, and the carboxyl end group concentration was 20eq / g (hereinafter, this polyamide 12 is referred to as "(PA-2) polyamide 12 "Or simply "(PA-2)"). (Amino end group concentration) / (carboxyl end group concentration)=1.9>1.

preparation example 3

[0188] (PA-3) Preparation of polyamide 12

[0189] (PA-3) polyamide 12 was synthesized by the method of Preparation Example 1, but 49.3 grams of isophorone diamine (1 / 350eq / mol lauryl lactam) in Preparation Example 1 was replaced with 28.8 grams of stearic acid (1 / 1,000eq / mol lauryl lactam), the reduced pressure of 0.05MPa is changed to 0.08MPa.

[0190] The relative viscosity of the prepared polymer was 2.25, the amino end group concentration was 27 μeq / g, and the carboxyl end group concentration was 35 μeq / g (hereinafter, this polyamide 12 is referred to as "(PA-3) polyamide 12 "Or simply "(PA-3)"). (Amino end group concentration) / (carboxyl end 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 invention relates to a multi-layer hose, which has excellent interlayer adhesive strength and fuel barrier properties, and its excellent interlayer adhesive strength still exhibits oil resistance over a long period of time. Background technique [0002] Due to the problem of antifreeze corrosion on roads in the past and the urgent need for energy conservation in recent years to prevent global warming, the main basic material of transportation hoses for automobiles has changed from metal to resin with light weight and excellent corrosion resistance. The resin used for the conveying hose is usually polyamide resin, saturated polyester resin, polyolefin resin or thermoplastic polyurethane resin. However, the heat resistance, chemical resistance and other properties of the single-layer hose made of these materials are not sufficient, so its application range is quite limited. [0003] On the other hand, fluorinated resin has excellent heat resistance, chemi...

Claims

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Application Information

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IPC IPC(8): B60K15/01B32B1/08B32B27/28B32B27/30B32B27/34C08F259/08C08L51/00F16L11/04F16L11/11F16L11/127F16L11/15
CPCB32B27/28B32B1/08F16L11/127Y10T428/139C08L51/003F16L11/15Y10T428/1317C08F259/08Y10T428/1393C08L2666/02B32B27/08B32B27/34B32B2270/00B32B2323/043B32B2323/046B32B2367/00B32B2398/20B32B2597/00
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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