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Preparation technology of inner pipe of five-layer coextrusion petroleum conveying pipe

A preparation process and oil pipeline technology, which is applied in the field of polymer composite pipes, can solve the problems of weak mechanical strength, easy corrosion, and bulky installation of pipelines, and achieve the effects of excellent impact strength, high mechanical resistance, and excellent chemical resistance

Inactive Publication Date: 2018-07-24
LUOYANG GUORUN NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the past, galvanized fuel pipes were generally used as fuel pipes in gas stations. As fuel pipes in gas stations, galvanized fuel pipes are easy to corrode, heavy and inconvenient to install, and easy to seep and leak. Composite pipes replace the galvanized pipes commonly used in the past. Therefore, plastic composite pipes are used in new gas stations or renovation of old gas stations. At present, a three-layer co-extrusion plastic composite pipe is common. Relatively speaking, three-layer co-extrusion Due to its structural characteristics, the plastic composite pipe has weak wear resistance on its inner wall, which affects its service life and has disadvantages such as weak mechanical strength; therefore, it is necessary to improve the three-layer co-extruded clinker composite pipe; in view of the above reasons, the current Research and development of a five-layer co-extrusion oil pipeline inner tube preparation process

Method used

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  • Preparation technology of inner pipe of five-layer coextrusion petroleum conveying pipe
  • Preparation technology of inner pipe of five-layer coextrusion petroleum conveying pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The structure of the inner pipe of the five-layer co-extruded oil pipeline from outside to inside is as follows: the first layer is the main layer of the high molecular polyethylene layer, the second layer is the anhydride modified EVA adhesive resin glue, and the third layer is the EVOH anti-corrosion layer. Permeation layer, the fourth layer is an acid anhydride modified EVA adhesive resin glue, the fifth layer is a static conductive layer; an acid anhydride modified EVA adhesive resin glue is set between the main layer of the polymer polyethylene layer and the EVOH impervious layer, and the EVOH anti-seepage layer An acid anhydride modified EVA bonding resin glue is set between the permeable layer and the static conductive layer.

Embodiment 2

[0022] At least eight temperature zones are evenly distributed on the barrel and head of the first extruder 1, the second extruder 2 is arranged above the outer periphery of the first extruder 1, and the fourth extruder is arranged below the outer periphery of the first extruder 1. Extruder 4, a third extruder 3 is arranged on the outer peripheral side of the first extruder 1, and a co-extrusion die head 5 is arranged on the barrel of the first extruder 1, and the co-extrusion die head 5 and the first extruder The barrels of the extruder 1 are connected, and the co-extrusion die head 5 is respectively connected with the heads of the second extruder 2, the third extruder 3, and the fourth extruder 4. At least four temperature zones are evenly distributed on the barrel and the machine head, and at least three temperature zones are distributed on the barrel and the machine head of the third extruder 3 and the fourth extruder 4;

[0023] In the first step of material preparation, ...

Embodiment 3

[0027] The material used for the high molecular polyethylene layer is and the mass percentage is: high molecular polyethylene 95-97%, graphite 1-3%, carbon black 1-3%, and the grade used for the high molecular polyethylene is 3490; the most The grade of material used in the inner static conductive layer is: XS6389A.

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Abstract

The invention discloses a preparation technology of an inner pipe of a five-layer coextrusion petroleum conveying pipe. A structure of the inner pipe of the five-layer coextrusion petroleum conveyingpipe is sequentially as following from outside to inside: the first layer is a high-molecule polyethylene layer main pipe layer, the second layer is an anhydride modified EVA bonding resin adhesive, the third layer is an EVOH permeation preventing layer, the fourth layer is an anhydride modified EVA bonding resin adhesive, and the fifth layer is a static electricity conductive layer; the anhydridemodified EVA bonding resin adhesive is arranged between the high-molecule polyethylene layer main pipe layer and the EVOH permeation preventing layer, and the anhydride modified EVA bonding resin adhesive is arranged between the EVOH permeation preventing layer and the static electricity conductive layer. The inner pipe of the five-layer coextrusion petroleum conveying pipe has the excellent characteristics of more excellent impact strength, more excellent chemical resistance, higher abrasion resistance and mechanical resistance and the like.

Description

technical field [0001] The invention relates to the field of polymer composite pipes, in particular to a preparation process for an inner pipe of a five-layer co-extruded oil pipeline. Background technique [0002] In the past, galvanized fuel pipes were generally used as fuel pipes in gas stations. As fuel pipes in gas stations, galvanized fuel pipes are easy to corrode, heavy and inconvenient to install, and easy to seep and leak. Composite pipes replace the galvanized pipes commonly used in the past. Therefore, plastic composite pipes are used in new gas stations or renovation of old gas stations. At present, a three-layer co-extrusion plastic composite pipe is common. Relatively speaking, three-layer co-extrusion Due to its structural characteristics, the plastic composite pipe has weak wear resistance on its inner wall, which affects its service life and has disadvantages such as weak mechanical strength; therefore, it is necessary to improve the three-layer co-extruded...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C47/06B29C47/92B29C47/08B29L23/00B29K23/00B29C48/92
CPCB29C48/025B29C48/18B29C48/92B29C2948/9259B29C2948/92704B29K2023/06B29L2023/22
Inventor 李品武张延成刘治军王向好
Owner LUOYANG GUORUN NEW MATERIAL TECH CO LTD