Multi-layer tube

A technology of multi-layer tubes and tube mothers, applied in the field of multi-layer tubes, can solve the problems of not being able to meet pressure resistance and flexibility at the same time, and achieve the effects of excellent chemical resistance, strong bending resistance, and high non-adhesiveness

Inactive Publication Date: 2005-08-03
SAMSUNG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This composite cannot satisfy pressure resistance and flexibility at the same time.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] [Molding of multilayer tubes]

[0040] use figure 1 The multilayer pipe shown is Example 1. As the fluororubber-based thermoplastic elastomer (A) of the pipe base material 3, Daiel thermoplastic fluororubber T-530 is used, and the vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer (B) is used as a mixture of the coating layer 2 , using THV-500G. The coating layer 2 is a mixture of a fluororubber-based thermoplastic elastomer (A) and a vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene terpolymer (B) at a ratio of 1:1.

[0041] Figure 2 shows the molded figure 1 Cross-section of the extrusion die of the multilayer tube 1. Barrel diameter: 40mm, L / D: 25 extruder is connected to the pipe base material inlet 11 of the mold, and the fluororubber thermoplastic elastomer (A) melted at a temperature of 260°C is injected from the pipe base material inlet 11 Injection passes through the pipe base material flow path 12. In addition, an extruder w...

Embodiment 2

[0051] Ethylene-tetrafluoroethylene (ETFE) whose hardness is JIS D55.

Embodiment 3

[0053] Vinylidene fluoride (PVDF) whose hardness is JIS D75.

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Abstract

A multi-layer tube ( 1 ) which comprises a base tube ( 3 ) and a coating layer ( 2 ) laminated on the inner surface of the base tube ( 3 ). The base tube ( 3 ) is made of a fluororubber type thermoplastic elastomer composed of rubber phase and a crystalline phase and has a hardness of HDA 40 or more and HDA 70 or less as measured according to JIS K 7215. The coating layer ( 2 ) is made of a blend of the above fluororubber type thermoplastic elastomer with a (vinylidene fluoride)-(hexafluoropropylene)-(tetrafluoroethylene) tenary copolymer and has a hardness of HDA 70 or more and HDD 80 or less as measured according to JIS K 7215.

Description

technical field [0001] The present invention relates to multilayer pipes for use as pipes for conveying liquids or gases. technical background [0002] In recent years, along with the development of the industry, there is a demand for flexible tubes that are excellent in chemical resistance, oil resistance, solvent resistance, heat resistance, and the like. On the other hand, various researches have also been carried out in response to this demand. For example, the present applicant discloses flexible pipes made of fluororubber or fluororubber-based thermoplastic elastomer in JP-A-10-052885 and JP-A-2001-193659 . [0003] According to the technology disclosed in Japanese Patent Publication No. 02-36365, the fluororubber-based thermoplastic elastomer is composed of a crystal phase and a rubber phase. The crystal phase uses a vinylidene fluoride-tetrafluoroethylene copolymer or an ethylene-tetrafluoroethylene copolymer. As the phase, a vinylidene fluoride-hexafluoropropylene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B1/08B32B25/04B32B25/14F16L11/04
CPCB32B25/14F16L11/04B32B1/08B32B25/04B32B25/08B32B27/304B32B27/322B32B2270/00
Inventor 林耕司北川晓直
Owner SAMSUNG GROUP
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