Multilayer tube

A polyamide and semi-aromatic technology, applied in the field of laminated tubes, can solve the problems of slow dissolution/precipitation of low molecular weight components, engine failure, etc., and achieve excellent durability

Active Publication Date: 2019-02-05
UBE IND LTD
View PDF17 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Furthermore, it was confirmed that the molded article obtained by applying a polyamide-based resin to the innermost layer, especially nylon 11 or nylon 12, which is excellent in strength, toughness, chemical resistance, and flexibility, due to contact with the aforementioned fuel Slowly elution / precipitation of low molecular weight components such as monomers and oligomers into the fuel indicates that the engine may not start or the internal pressure of the fuel container may be caused by adhesion to the movable part of the fuel injector and fuel container valve. control issues

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Multilayer tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0466] Using the polyamide 12 composition (A-1) and the semi-aromatic polyamide composition (B-1) shown above, using a Plabor (manufactured by Plastic Engineering Research Institute Co., Ltd.) 2-layer pipe forming machine, (A -1) (B-1) was separately melted at an extrusion temperature of 270°C and at an extrusion temperature of 300°C, and the discharged molten resins were merged with a confluencer to form a laminated tubular body. Then, it is cooled and removed by a sizing die for controlling the size, and (a) layer (outermost layer) formed from (A-1) and (b) layer (outermost layer) formed from (B-1) are produced. Inner layer), a laminated tube having a layer structure of (a) / (b)=0.75 / 0.25 mm, an inner diameter of 6 mm, and an outer diameter of 8 mm was obtained. Table 1 shows the measurement results of physical properties of the laminated tube.

Embodiment 2

[0468] In Example 1, a laminated tube having a layer structure shown in Table 1 was obtained by the same method as in Example 1 except that the polyamide 12 composition (A-1) was changed to (A-2). Table 1 shows the measurement results of physical properties of the laminated tube.

Embodiment 3

[0470] In Example 1, a laminated tube having a layer structure shown in Table 1 was obtained by the same method as in Example 1 except that the polyamide 12 composition (A-1) was changed to (A-3). Table 1 shows the measurement results of physical properties of the laminated tube.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
decomposition temperatureaaaaaaaaaa
particle sizeaaaaaaaaaa
oil absorptionaaaaaaaaaa
Login to view more

Abstract

Provided is a multilayer tube which comprises a layer containing a specific aliphatic polyamide composition and a layer containing a semiaromatic polyamide composition that contains a semiaromatic polyamide having a specific structure, and wherein the layers are arranged adjacent to each other. The aliphatic polyamide composition contains: an aliphatic polyamide wherein the ratio of the number ofmethylene groups to the number of amide groups is a specific value or higher; a polyamide wherein the absolute value of the difference of the solubility parameter SP value between itself and the above-described aliphatic polyamide is within a specific range; and an elastomer polymer which contains a constituent unit derived from an unsaturated compound having a carboxyl group and / or an acid anhydride group.

Description

technical field [0001] The present invention relates to laminated tubes. Background technique [0002] For pipes for automobile piping, due to the rust problem caused by road antifreeze, the prevention of global warming, and the demand for energy saving, the main raw material is gradually replaced by metal with excellent rust resistance and light weight resin . Generally, resins used as pipes for piping include polyamide-based resins, saturated polyester-based resins, polyolefin-based resins, and thermoplastic polyurethane-based resins. Since heat resistance, chemical resistance, etc. are insufficient, the applicable range is limited. [0003] In addition, from the point of view of saving gasoline consumption and improving performance, automobile piping pipes are used to transport alcohols with a low boiling point such as methanol and ethanol, or ethers such as ethyl-tert-butyl ether (ETBE). Oxygen gasoline, etc. Furthermore, from the viewpoint of preventing environmenta...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): B32B1/08B32B27/34C08L13/00C08L77/00F16L11/127
CPCB32B27/34F16L11/127B32B1/08B32B27/08B32B27/322B32B27/20B32B2270/00B32B2597/00B32B2250/02B32B2250/03B32B2250/04B32B2250/24B32B2264/108B32B2274/00B32B2307/202B32B2307/558B32B2307/306B32B2307/714C08L77/02C08L2205/025C08L2205/03C08L51/06C08L77/06B29C48/09B29C48/18C08L77/00B32B37/153B32B2327/18B32B2377/00B32B2398/20C08L77/10
Inventor 久留宫晶中村孝治
Owner UBE IND LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap