Flexible composite tube and manufacturing method thereof

A technology of flexible composite pipes and inner layer pipes, which is applied in the direction of hoses, pipes, mechanical equipment, etc., can solve the problems of poor pressure bearing capacity of composite pipes, easy delamination of inner pipes and reinforcement layers, and easy creep of composite pipes. Achieve the effects of avoiding creep, good barrier and anti-swelling properties, and good high temperature resistance

Active Publication Date: 2014-01-08
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems in the prior art that the composite pipe is easy to creep, low temperature resistance, easy to delaminate between the inner pipe and the rei

Method used

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  • Flexible composite tube and manufacturing method thereof
  • Flexible composite tube and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Such as figure 1 As shown, the embodiment of the present invention provides a flexible composite pipe, the flexible composite pipe includes: an inner pipe, a reinforcement layer and an outer pipe, the inner pipe is the innermost layer of the flexible composite pipe, and the inner pipe is connected to the The substance to be transported is in direct contact with the material to be transported, and the substance to be transported flows in the inner tube. The reinforcement layer is between the inner tube and the outer tube. The reinforcement layer is used to increase the strength of the flexible composite tube. The outer tube is the outermost layer of the flexible composite tube. The layer tube is used to protect the inner layer tube and play the role of anti-scratch, anti-static and flame retardant;

[0038] Wherein, the percentage of various components in the inner tube is the percentage of the mass of each component in the inner tube to the total mass, and the percentag...

Embodiment 2

[0062] An embodiment of the present invention provides a method for preparing a flexible composite pipe, the preparation method comprising:

[0063] (1) Preparation of inner tube

[0064] Step 1: Copolymerize 60-85% polyvinylidene fluoride, 8-25% polyethylene, 3-6% polyethylene grafted difluoromaleic anhydride, and 5-10% ethylene-propylene according to mass percentage and 0.3-0.6% antioxidant into the high-speed mixing tank, so that the above materials are mixed evenly and the inner tube material is obtained;

[0065] Step 2: Put the material of the inner tube into the twin-screw extruder for mixing. The twin-screw extruder is divided into the first section, the second section, the third section, the fourth section and the fifth section. The first section and The extrusion temperature of the second section is 150-170°C, the extrusion temperature of the third, fourth, and fifth sections is 170-200°C, and the extruder speed of the twin-screw extruder is 300-350r / min. The total...

Embodiment 3

[0077]The embodiment of the present invention provides a flexible composite pipe and its preparation method, the flexible composite pipe and its preparation method comprising:

[0078] (1) Preparation of inner tube

[0079] Step 1: Weigh the raw materials of the corresponding components according to the following mass percentages, among them, 64% polyvinylidene fluoride, 24% high-density polyethylene, 5.2% polyethylene grafted difluoromaleic anhydride, 6.5% ethylene-propylene copolymer material, 0.3% antioxidant, and the raw materials of each component are added into the high-speed mixing tank and mixed evenly to obtain the inner tube material;

[0080] Step 2: Add the material of the inner layer tube into the twin-screw extruder for mixing. The twin-screw extruder is divided into the first section, the second section, the third section, the fourth section and the fifth section. The exit temperature is T1=150°C, the extrusion temperature of the second stage is T2=160°C, the e...

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Abstract

The invention discloses a flexible composite tube and a manufacturing method thereof, and belongs to the technical field of pipelines. The flexible composite tube comprises an inner layer tube, a reinforcing layer and an outer layer tube. The inner layer tube is made of polyvinylidene difluoride, polyethylene, polyethylene stem grafting difluoro maleic anhydride, ethylene-propylene polymer and antioxygen. The reinforcing layer is made of long-fiber reinforced resin matrix prepreg tapes. The outer layer tube is made of polyethylene or polypropylene. The manufacturing method for the flexible composite tube comprises the step of manufacturing the inner layer tube, the step of manufacturing the reinforcing layer and the step of manufacturing the outer layer tube. The inner layer tube made of the polyvinylidene difluoride, the polyethylene, the polyethylene stem grafting difluoro maleic anhydride, the ethylene-propylene polymer and the antioxygen is adopted, so that the flexible composite tube has a good high-temperature resistant property, a good barrier property and a good anti-swelling property. The creep deformation of the inner layer tube can be effectively avoided, the long-fiber reinforced resin matrix prepreg tapes adopted in the reinforcing layer have a good binding capability with the inner layer tube, and the layering of a pipeline can be effectively avoided. Meanwhile, the flexible composite tube has the advantages of being simple in structure, low in cost, simple in manufacturing method and the like, and has wide application prospects.

Description

technical field [0001] The invention relates to the technical field of pipes, in particular to a flexible composite pipe and a preparation method thereof. Background technique [0002] With the rapid development of oil and gas, coal, water conservancy and other industries, more and more pipelines are applied to oil and natural gas exploitation, oil and gas gathering and transportation and injection, sewage treatment and various pipeline fields that require higher pressure to transport substances . Most of the substances passing through the pipeline are corrosive to a certain extent, so that the original metal pipelines are often subjected to severe corrosion. In order to alleviate the corrosion problem of pipelines, most of the existing transmission pipelines are flexible composite pipes. [0003] At present, the flexible composite pipe wall in the prior art is generally composed of three layers. The inner layer is a corrosion-resistant and wear-resistant inner pipe, mostl...

Claims

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Application Information

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IPC IPC(8): F16L11/08C08L27/16C08L23/06C08L51/06C08L53/00C08L23/12C08K7/14C08K7/06C08L77/10C08L23/08B29B9/06B29C69/02B29C47/00B29C53/58
CPCB29B9/06B29C48/92B29C53/56B29C69/02B29C2948/92066B29C2948/92085B29C2948/92209C08K13/02C08L27/16C08L2203/18C08L2205/035C08L2207/062F16L11/08C08L23/06C08L51/06C08L53/00C08L23/0815
Inventor 魏斌戚东涛李厚补丁楠蔡雪华王熙
Owner BC P INC CHINA NAT PETROLEUM CORP
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