Isobaric preparation process for polytetrafluoroethylene lining of pipeline

A polytetrafluoroethylene and preparation process technology, applied in the field of pipeline lining, can solve the problems of uneven pressure, easy cracking between layers, large shrinkage rate, etc. Effect

Inactive Publication Date: 2021-04-02
JIANGSU JIN FU LONG ANTICORROSION EQUIP CO LTD
View PDF5 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The operating parameters of the winding method are difficult to control, and the products often have defects such as detachment, bubbling, and stress cracking. In actual use, the products are not resistant to negative pressure, and the interlayers are easy to crack and cause leakage.
However, in the traditional PTFE molding process, because different sizes of lining products require presses of different tonnages and complex molds, the investment cost is high and the operation is difficult.
Due to the difficulty i

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Isobaric preparation process for polytetrafluoroethylene lining of pipeline

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: With reference to the accompanying drawings, the preparation process of the pipeline polytetrafluoroethylene lining, the specific operation process is as follows:

[0027] A. Treatment of the inner surface of the steel pipe: firstly, the inner surface of the pipeline 1 is degreased and rust-removed, and the rust-removing level inside the steel pipe is reached to Sa2 by sandblasting;

[0028] B. Put rubber bag soft mold: put rubber bag soft mold 2 into the pipe, the thickness of the rubber bag is 3 mm, and leave a uniform gap of 16 mm between the rubber bag and the pipe;

[0029] C. Add polytetrafluoroethylene powder: add polytetrafluoroethylene powder with a particle size of 700 μm into the gap between the rubber bag and the pipe, fill it evenly, and form a polytetrafluoroethylene layer 3;

[0030] D. Sealing: put in the binder ring 4 and the end cover 5, and tighten them with bolts to seal the pipeline tightly;

[0031] E. Place in the autoclave for wate...

Embodiment 2

[0036] Embodiment 2: With reference to the accompanying drawings, the preparation process of the pipeline polytetrafluoroethylene lining, the specific operation process is as follows:

[0037] A. Treatment of the inner surface of the steel pipe: firstly, the inner surface of the pipeline 1 is degreased and rust-removed, and the rust-removal level inside the steel pipe is reached to Sa2.5 by sandblasting;

[0038] B. Put rubber bag soft mold: put rubber bag soft mold 2 into the pipe, the thickness of the rubber bag is 2 mm, and leave a uniform gap of 14 mm between the rubber bag and the pipe;

[0039] C. Add polytetrafluoroethylene powder: add polytetrafluoroethylene powder with a particle size of 500 μm into the gap between the rubber bag and the pipe, fill it evenly, and form a polytetrafluoroethylene layer 3;

[0040] D. Sealing: put in the binder ring 4 and the end cover 5, and tighten them with bolts to seal the pipeline tightly;

[0041] E. Place in the autoclave for wat...

Embodiment 3

[0046] Embodiment 3: With reference to the accompanying drawings, the preparation process of the pipeline polytetrafluoroethylene lining, the specific operation process is as follows:

[0047] A. Treatment of the inner surface of the steel pipe: firstly, the inner surface of the pipeline 1 is degreased and rust-removed, and sandblasting is used to make the inner surface of the steel pipe reach Sa3 level;

[0048] B. Put rubber bag soft mold: put rubber bag soft mold 2 into the pipe, the thickness of the rubber bag is 2 mm, and leave a uniform gap of 12 mm between the rubber bag and the pipe;

[0049] C. Add polytetrafluoroethylene powder: add polytetrafluoroethylene powder with a particle size of 300 μm into the gap between the rubber bag and the pipe, fill it evenly, and form a polytetrafluoroethylene layer 3;

[0050] D. Sealing: put in the binder ring 4 and the end cover 5, and tighten them with bolts to seal the pipeline tightly;

[0051] E. Place in the autoclave for wat...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Granularityaaaaaaaaaa
Granularityaaaaaaaaaa
Granularityaaaaaaaaaa
Login to view more

Abstract

The invention belongs to the technical field of pipeline linings, and discloses an isobaric preparation process for a polytetrafluoroethylene lining of a pipeline. The process comprises the followingsteps of filling polytetrafluoroethylene powder between the inner wall of the pipeline and a rubber bag soft mold, sealing, putting into an autoclave, equally increasing the water pressure in a rubberbag and the autoclave to a specific high pressure, and expanding the rubber bag to compact polytetrafluoroethylene, so that forming the uniform and compact lining on the inner wall of a steel pipe. Compared with a traditional compression molding method, the isobaric molding process has the advantages that equipment and molds used are simple, operation is convenient, and the yield is high; the pressures inside and outside the pipeline are equal in the machining process, and the steel pipe is not damaged; and the lining is uniform and compact and low in shrinkage rate due to everywhere equal high pressure. The specific technological process comprises the steps of A, steel pipe inner surface treatment, B, rubber bag soft mold loading, C, polytetrafluoroethylene powder adding, D, sealing, E,water injection and pressurization in the autoclave, F, pressure relief and part taking, G, rubber bag soft mold removal, H, sintering and I, inner filler removal.

Description

technical field [0001] The invention relates to the technical field of pipeline linings, in particular to an isobaric preparation process of pipeline polytetrafluoroethylene linings. Background technique [0002] Steel pipelines are widely used in chemical, petroleum, pharmaceutical and other related industries. In practical applications, because the pipelines transport corrosive substances, especially strong acid and strong alkali, steel pipes will be severely corroded and extremely Greatly shorten its service life. PTFE has high chemical inertness, does not react with strong corrosive media such as hydrofluoric acid, concentrated hydrochloric acid, nitric acid, concentrated sulfuric acid and boiling sodium hydroxide solution, and can work for a long time at a temperature of -60 to 260 °C , Widely used as corrosion-resistant lining material for chemical equipment and accessories. The PTFE-lined steel pipe plays an important role in the transportation of strong corrosive m...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): B29C43/10B29C43/00B29L23/00
CPCB29C43/006B29C43/10B29L2023/22
Inventor 万德春杨云旺
Owner JIANGSU JIN FU LONG ANTICORROSION EQUIP CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap