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Inner buckling joint of Teflon corrugated pipe and preparation method of inner buckling joint

A bellows and Teflon technology, applied in the field of crimping joints in Teflon corrugated pipes and their preparation, can solve the problems of leakage of crimping joints, endangering the safety of on-site staff, environmental pollution and the like

Active Publication Date: 2021-09-07
江阴市中鼎节能流体科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The material properties of each pipe are different, and the sealing form is also different. When using ordinary crimped joints on the pipeline, liquid leakage often occurs, resulting in equipment damage, environmental pollution, and even endangering the safety of on-site workers.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) The buckle joint is made of 304 stainless steel, and the thread surface of the buckle joint is provided with many small notches.

[0026] (2) Degrease the inner surface of the crimped joint in an alkaline degreasing agent at 60°C for 30 minutes, clean the surface of the crimped joint with deionized water, and dry it with compressed air; use quartz sand with a particle diameter of 2 mm, and the sandblasting pressure is 0.5 MPa. The surface of the joint is sandblasted.

[0027] (3) The surface of the crimping joint is coated with a highly corrosion-resistant modified polyperfluoroethylene propylene coating to obtain a crimping joint inside the Teflon bellows. The specific steps are as follows:

[0028] S1: Preparation of epoxy resin

[0029] Ⅰ. Add 2,5-dihydroxybiphenyl, paraformaldehyde and cuprous chloride to concentrated hydrochloric acid, heat to 105°C, and react in a closed system for 24 hours. After the solution is cooled, remove the upper aqueous solution and ...

Embodiment 2

[0039] (1) The buckle joint is made of 304 stainless steel, and the thread surface of the buckle joint is provided with many small notches.

[0040] (2) Degrease the inner surface of the crimped joint in an alkaline degreasing agent at 70°C for 25 minutes, clean the surface of the crimped joint with deionized water, and dry it with compressed air; use quartz sand with a particle diameter of 3 mm, and the sandblasting pressure is 0.6 MPa. The surface of the joint is sandblasted.

[0041] (3) The surface of the crimping joint is coated with a highly corrosion-resistant modified polyperfluoroethylene propylene coating to obtain a crimping joint inside the Teflon bellows. The specific steps are as follows:

[0042] S1: Preparation of epoxy resin

[0043] 1. Add 2,5-dihydroxybiphenyl, paraformaldehyde and cuprous chloride to concentrated hydrochloric acid, heat to 115°C, and react in a closed system for 20 hours. After the solution is cooled, remove the upper aqueous solution and ad...

Embodiment 3

[0053] (1) The buckle joint is made of 304 stainless steel, and the thread surface of the buckle joint is provided with many small notches.

[0054] (2) Degrease the inner surface of the crimped joint in an alkaline degreasing agent at 80°C for 20 minutes, clean the surface of the crimped joint with deionized water, and dry it with compressed air; use quartz sand with a particle diameter of 4 mm, and the sandblasting pressure is 0.5-0.7 MPa, Sand blast the surface of the buckle joint.

[0055] (3) The surface of the crimping joint is coated with a highly corrosion-resistant modified polyperfluoroethylene propylene coating to obtain a crimping joint inside the Teflon bellows. The specific steps are as follows:

[0056] S1: Preparation of epoxy resin

[0057] 1. Add 2,5-dihydroxybiphenyl, paraformaldehyde and cuprous chloride to concentrated hydrochloric acid, heat to 120°C, and react in a closed system for 16 hours. After the solution is cooled, remove the upper aqueous soluti...

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PUM

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Abstract

The invention discloses an inner buckling joint of a Teflon corrugated pipe and a preparation method of the inner buckling joint. The preparation method comprises the following steps of processing 304 stainless steel to manufacture the buckling joint, and forming a plurality of small notches in the threaded surface of the buckling joint; degreasing the inner surface of the buckling joint in an alkaline degreasing agent, cleaning, drying and then carrying out sand blasting treatment; uniformly mixing and stirring fluorinated ethylene propylene, epoxy resin and isopropanol, adding nano silicon nitride and KH570, uniformly stirring, adding modified graphene oxide, uniformly stirring, coating on the inner surface of the buckling joint, and sintering to form a modified fluorinated ethylene propylene coating, thereby obtaining the inner buckling joint of the Teflon corrugated pipe, wherein the epoxy resin is prepared from 2', 5'-dihydroxybiphenyl-4-methanol and epichlorohydrin under the catalysis of sodium hydroxide, and the modified graphene oxide is prepared from dopamine modified graphene oxide. The prepared Teflon corrugated pipe inner buckling joint has the corrosion resistance and the sealing performance.

Description

technical field [0001] The invention relates to the technical field of crimping joints, in particular to a crimping joint inside a Teflon corrugated pipe and a preparation method thereof Background technique [0002] Teflon tube is a special tube made of PTFE extrusion and sintering, drying, high temperature sintering, shaping and other processes. It is widely used in chemical industry, electronic appliances, machinery, automobile, aerospace, computer, electric heating, military , communications and other important technology industries. Teflon bellows have extremely high chemical stability and can withstand all strong acids, including aqua regia, hydrofluoric acid, concentrated hydrochloric acid, nitric acid, oleum, organic acids, etc. [0003] Teflon corrugated pipe inner buckle joints are generally made of stainless steel, and the chemical stability of stainless steel is quite different from that of polytetrafluoroethylene, which seriously restricts the scope of use of T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B05D7/24B05D3/00B05D3/10C09D163/00C09D127/18C09D5/08C09D7/62C09D7/61C23G1/19
CPCB05D7/24B05D3/002B05D3/102C09D163/00C09D5/08C09D7/62C09D7/61C23G1/19B05D2202/15B05D2506/10B05D2504/00C08L27/18C08K9/04C08K3/042C08K3/34Y02A20/20
Inventor 王伟建王力李双江
Owner 江阴市中鼎节能流体科技有限公司
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