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Stretch-orientated silane cross-linked polyethylene pipe and its preparing process

A technology of cross-linked polyethylene and silane cross-linking, which is applied in the direction of pipes, rigid pipes, pipes/pipe joints/fittings, etc., can solve the problems of environmental stress cracking resistance and other important performance degradation, and achieve environmental stress cracking and stress resistance. Good mouth cracking performance and high pressure bearing capacity

Inactive Publication Date: 2002-05-29
DONGTAI NEW MATERIAL SCI ANG TECH SICHUAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, although the internal pressure-bearing capacity of stretched products, that is, stretch-oriented pipes, has been greatly improved, the hazards of stress cracking have also increased, and the actual requirements of pipes such as environmental stress cracking resistance and other important properties have declined.

Method used

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  • Stretch-orientated silane cross-linked polyethylene pipe and its preparing process
  • Stretch-orientated silane cross-linked polyethylene pipe and its preparing process
  • Stretch-orientated silane cross-linked polyethylene pipe and its preparing process

Examples

Experimental program
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Effect test

Embodiment 1

[0038] figure 1 The diagram of Example 1 of the silane crosslinked polyethylene pipe of the present invention is given. The silane crosslinkable polyethylene material in the pipe wall undergoes a radial unidirectional (or radial and axial bidirectional) stretching and orientation process, and then hydrolyzes, condenses and crosslinks to form a silane crosslinked polyethylene structure layer 1 .

Embodiment 2

[0040] Fig. 2 shows the diagram of Embodiment 2 of the silane crosslinked polyethylene pipe of the present invention. The silane-crosslinkable polyethylene material in the pipe wall is processed by radial unidirectional (or radial and axial bidirectional) stretching and orientation process, and then undergoes hydrolysis, condensation and crosslinking reaction to form the inner layer 2 of silane crosslinked polyethylene structure. A layer of thermoplastic is compositely extruded on the outer periphery of the inner layer 2 of the silane cross-linked polyethylene structure to form a pipe hot-melt connection layer 3 (or an adhesive connection layer).

Embodiment 3

[0042] image 3 The diagram of Example 3 of the silane crosslinked polyethylene pipe of the present invention is given. There is an inner layer 4 of silane cross-linked polyethylene structure oriented by radial unidirectional (or radial and axial bidirectional) stretching in the pipe wall. A layer of hot-melt adhesive (or a blend of hot-melt adhesive and polymer) is compounded on the outer periphery of the inner layer 4 of the silane cross-linked polyethylene structure to form a hot-melt connection layer 5 (adhesive connection layer).

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Abstract

A stretch orientated silane cross-linked polyethene pipe features that its pipe wall contains at least one polyethene layer, which is orientated by radially or both radially and axially stretching and then hydrolytically condensated for cross-linking with silane. Its advantages include high pressure-bearing power and high anticracking performance. Its preparing process is also disclosed.

Description

Technical field: [0001] The invention relates to a pipe, in particular to a stretch-oriented silane cross-linked polyethylene pipe and a manufacturing method thereof. Background technique: [0002] Silane cross-linked polyethylene pipes are compared with ordinary polyethylene pipes with rapid application development. Due to the chemical cross-linking of polyethylene by silane, its linear structure is transformed into a three-dimensional structure, which significantly improves the performance of polyethylene. Its heat resistance Performance and thermal strength, heat aging resistance, environmental stress cracking resistance, electrical insulation, barrier properties, resistance to gasoline and aromatics, creep resistance, and low cracking have been greatly improved, making the original polyethylene pipe The field of application can be broadened, and some difficulties in the original use can be overcome. That is, silane cross-linked polyethylene pipes have better performance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29B9/02B32B1/08C08J3/12F16L9/12
Inventor 甘国工
Owner DONGTAI NEW MATERIAL SCI ANG TECH SICHUAN
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