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Multilayer tube

a multi-layer tube technology, applied in the field of multi-layer tubes, can solve the problems of liquid leakage, high temperature, and inability to exert cooling effect and catalysis effect during actual use, and achieve the effects of excellent low temperature impact resistance, high temperature, and flexibility

Active Publication Date: 2021-03-18
UBE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a multilayer tube that can withstand low temperatures and high pressure, while also being flexible and dimensionally stable. Additionally, the tube can prevent the leakage of low molecular weight substances and ions.

Problems solved by technology

In particular, when a circulating fluid is a coolant (LLC) containing ethylene glycol as the main component for freeze prevention in winter season, a urea solution enclosed as a catalyst for removing NOx exhausted from a diesel engine, or a refrigerant such as carbon dioxide, freon, alternative freon, propane, and water used in an air conditioner, a radiator, or the like, if the hoses and tubes have insufficient barrier properties to these chemical liquids, the cooling effect and catalysis effect cannot be exerted during actual use.
Further, with tightening regulations on transpiration of ozone depleting gases, needs for barrier properties to refrigerants of a tube for transporting refrigerants used in automobiles are demanding.
As a result from the acid, a material contacting with chemical liquids tend to be hydrolyzed or degraded depending on the type of the material, and at worst, there are problems in that cracks are formed in the material, liquids are leaking and the purpose of transporting fluids can not be accomplished.
Alternatively, when chemical liquids or water is penetrating through the tube body, parts contacting with the liquids or water may be adversely affected.
However, use of halogen-containing materials tends to be avoided on dealing with environmental problems and the resin has problems of the high specific gravity and high cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0206]Using the above-described aliphatic polyamide composition (A-1) and the modified polypropylene(B-1), (A-1) and (B-1) were separately melted and extruded at an extrusion temperature of 270° C. and 220° C. in Plabor (manufactured by PLABOR Research Laboratory of Plastics Technology Co., Ltd) two layer tube processing machine, respectively. The extruded melted resins were mixed by an adaptor, and processed to form a multilayer tubular body. Then the body was cooled by a dimension regulating sizing die and withdrawn to obtain a multilayer tube having a layer configuration of (a) / (b)=0.75 / 0.25 mm, the inner diameter of 6.0 mm and the outer diameter of 8.0 mm when the layer (a) (outermost layer) is composed of (A-1), and the layer (b) (innermost layer) is composed of (B-1). The measuring result of the properties for this multilayer tube is shown in Table 1.

example 2

[0207]A multilayer tube having a layer configuration of (a) / (b)=0.65 / 0.35 mm, the inner diameter of 6.0 mm and the outer diameter of 8.0 mm was obtained by the similar method as Example 1 except that the thicknesses of the layers were changed in Example 1. The measuring result of the properties for this multilayer tube is shown in Table 1.

example 3

[0208]A multilayer tube having a layer configuration of (a) / (b)=0.80 / 0.20 mm, the inner diameter of 6.0 mm and the outer diameter of 8.0 mm was obtained by the similar method as Example 1 except that the thicknesses of the layers were changed in Example 1. The measuring result of the properties for this multilayer tube is shown in Table 1.

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Abstract

A multilayer tube having excellent low temperature impact resistance, breakage pressure strength at high temperature, flexibility, dimensional stability, and elution resistance of low molecular weight substances and ion components. The multilayer tube has a layer containing an aliphatic polyamide composition having a predetermined range of a bending elastic modulus; a layer containing a modified polyolefin has a melting point over a predetermined temperature, and the aliphatic polyamide composition contains an aliphatic polyamide having a predetermined range of a methylene group / amide group number ratio, an elastomer polymer having a constituent unit derived from a carboxyl group and / or acid anhydride group-containing unsaturated compound, and a plasticizer having a certain structure if necessary; and the thickness of the layer containing the aliphatic polyamide composition is a specific ratio or more of the total wall thickness of the tube.

Description

TECHNICAL FIELD[0001]The present invention relates to a multilayer tube.BACKGROUND ART[0002]Many hoses and tubes are used in various pressure tubes such as an oil pressure tube and a water pressure tube, a vacuum tube, a fuel tube used for automobiles, a brake tube, a hose for coolant, a tube for air conditioner, a tube for SCR (a machine for removing an exhaust gas in a diesel engine), a control cable liner, and the like. In these hoses and tubes, chemical liquids such as coolants (alcohols and water), refrigerants, oils, and urea solutions are transported. For various hoses and tubes used in automobile industry, extremely high properties such as high breakage pressure strength at high temperature, long period heat resistance, chemical resistance, barrier properties to water vapor and chemical liquids, and flexibility are required.[0003]In particular, when a circulating fluid is a coolant (LLC) containing ethylene glycol as the main component for freeze prevention in winter season,...

Claims

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Application Information

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IPC IPC(8): B32B1/08B32B27/08B32B27/34B32B27/32B32B27/22
CPCB32B1/08B32B27/08B32B27/34B32B27/32B32B27/22B32B2597/00B32B2250/24B32B2307/558B32B2323/10B32B2377/00B32B2250/03F16L11/04B32B27/281B32B27/30B32B27/38B32B27/42B32B2250/02B32B2270/00B32B2307/30B32B2307/308B32B2307/546B32B2307/554B32B2307/714B32B2307/7265B32B2307/732B32B2605/00B32B2479/00B32B2457/00B32B2419/00B32B2535/00B32B2307/51B32B2307/54C08L77/02C08G69/14C08G69/26C08L77/06C09D177/02C09D177/06C08L23/0815C08L2207/20C08L67/02C08K2003/265C08L51/06
Inventor TSUBOI, KAZUTOSHISASAKI, RIYOUSUKEFUKUDA, RIYUUNAKAMURA, KOJI
Owner UBE CORP