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Cross-linked polyethylene lined composite pipe and production method thereof

A technology of cross-linked polyethylene and production methods, which is applied in the direction of pipes, rigid pipes, pipes/pipe joints/pipe fittings, etc., can solve problems such as many production control links, affect the application of oil pipes, and complicated processes, so as to improve product quality and avoid Peeling off, good composite effect

Active Publication Date: 2018-09-11
ZHEJIANG WEIXING NEW BUILDING MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, cross-linked polyethylene pipes have many production control links and complex processes, especially for large-diameter cross-linked polyethylene pipes with a diameter greater than 63mm, which has considerable technical difficulties, which affects its application in the field of oil pipes.

Method used

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  • Cross-linked polyethylene lined composite pipe and production method thereof
  • Cross-linked polyethylene lined composite pipe and production method thereof
  • Cross-linked polyethylene lined composite pipe and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The cross-linked polyethylene lined pipe selected in this example has an outer diameter of 63-63.6mm and a wall thickness of 3.0-3.4mm; The gauge length is 1200mm.

[0049] Among them, the cross-linked polyethylene lining pipe is made of the following components by weight ratio: 90 parts of cross-linked polyethylene raw materials; 0.05 parts of silicone external lubricating additives; 0.5 parts of telechelic hydrophilic group polymer additives; Antioxidant 1010 is 0.15 parts; antioxidant 168 is 0.5 parts; linear low density polyethylene powder is 2 parts.

[0050] Use a reducing machine to reduce the outer diameter of the cross-linked polyethylene lined pipe to less than 54mm, insert it into the steel pipe, place it for 24 hours to restore the stress, and then place it at a constant temperature of 80°C for 3 hours to relieve the stress and shape it. Keep both ends of the cross-linked polyethylene lined pipe 20-25mm longer than the steel pipe, and heat the two ends of t...

Embodiment 2

[0052] The cross-linked polyethylene lining pipe selected in this example has an outer diameter of 91.5-92.4mm and a wall thickness of 4.5-5.0mm; The gauge length is 1200mm.

[0053] Among them, the cross-linked polyethylene lining pipe is made of the following components by weight: 100 parts of cross-linked polyethylene raw material; 0.1 part of silicone-based external lubricating additive; 0.25 part of telechelic hydrophilic group polymer additive; 0.1 part of antioxidant 1010; 0.1 part of antioxidant 168; 6 parts of linear low density polyethylene powder.

[0054] Use a reducing machine to reduce the outer diameter of the cross-linked polyethylene lined pipe to less than 86mm, insert it into the steel pipe, place it for 24 hours to recover the stress, and then place it at a constant temperature of 90°C for 2 hours to relieve the stress and shape it. Keep both ends of the lining pipe 20-25mm longer than the steel pipe, heat both ends to 200°C for 3 minutes, flanging until t...

Embodiment 3

[0056] The cross-linked polyethylene lining pipe selected in this example has an outer diameter of 160-161.5mm and a wall thickness of 3.0-3.4mm; The gauge length is 1200mm.

[0057] Among them, the cross-linked polyethylene lining pipe is made of the following components by weight ratio: 95 parts of cross-linked polyethylene raw materials; 0.2 parts of silicone-based external lubricating additives; 0.1 parts of telechelic hydrophilic group polymer additives; 0.5 parts of antioxidant 1010; 0.15 parts of antioxidant 168; 4 parts of linear low density polyethylene powder.

[0058] Use a reducing machine to reduce the outer diameter of the cross-linked polyethylene lined pipe to less than 152mm, insert it into the steel pipe, place it for 24 hours to restore the stress, and then place it at a constant temperature of 90°C for 2 hours to relieve the stress and shape it. Keep both ends of the lining pipe 20-25mm longer than the steel pipe, heat both ends to 200°C for 3 minutes, fla...

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Abstract

The invention discloses a production method of a crosslinked polyethylene lining composite pipe. The production method comprises the following steps: a steel pipe and a crosslinked polyethylene pipe to be compounded are selected, wherein the inner diameter of the steel pipe is smaller than the outer diameter of the crosslinked polyethylene pipe; the dust removal cleaning is performed for the steel pipe, and the diameter reducing treatment is performed for the crosslinked polyethylene pipe, so that the outer diameter of the crosslinked polyethylene pipe is smaller than the inner diameter of the steel pipe; the crosslinked polyethylene pipe is put in the steel pipe for a period of time; and the pipe diameter of the crosslinked polyethylene pipe is returned to be tightly bonded with the inner wall of the steel pipe to obtain the crosslinked polyethylene lining composite pipe. The production method solves the pre-crosslinking phenomenon in the crosslinked polyethylene pipe production process, in particular in the large-caliber pipe extrusion production process, enables the inner and outer wall surfaces of the pipe to become smooth, and improves the production continuity. The produced lining composite pipe is excellent in compounding effect, prevents the generation of stripping phenomenon of an inner pipe and an outer pipe, is relatively lower in process difficulty coefficient, and is high in productivity.

Description

technical field [0001] The invention relates to the production technology of oil pipes, in particular to a cross-linked polyethylene-lined composite pipe and its production method. Background technique [0002] As a consumable in the development fields such as oil and natural gas exploration, oil pipe plays a pivotal role. Existing oil pipes are generally made of steel materials. Due to eccentric wear and corrosion during use, the service life of oil pipes is short and the replacement cycle is short. In addition, after a period of use, oil pipes made of steel will often form wax on the inner wall, and then scale will form, resulting in narrowing of the inner diameter of the oil pipe. It needs to be stopped and cleaned regularly, which reduces production efficiency. [0003] In order to solve the above problems, one way in the prior art is to coat the inner wall of the oil pipe to prevent wax formation and scaling. However, it is difficult to clean the inner wall of the oil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16L9/147C08L23/06C08L83/04C08L23/08C08L101/00C08K5/134C08K5/526
CPCC08L23/06C08L2203/18C08L2205/02C08L2205/035F16L9/147C08L83/04C08L23/0815C08L101/00C08K5/1345C08K5/526
Inventor 金红阳夏超赵相盈靳铁标
Owner ZHEJIANG WEIXING NEW BUILDING MATERIALS CO LTD
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