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Method for painting fluoro resin inside slender metal tube

A metal tube and fluororesin technology, which is applied in the directions of cleaning methods using liquids, chemical instruments and methods, cleaning methods and utensils, etc., can solve the problems of unsatisfactory anti-corrosion performance of anti-corrosion coatings, poor coating construction technology, and weak metal bonding. and other problems, to achieve the effect of automatic production, high utilization rate of paint, and improvement of working environment

Inactive Publication Date: 2006-05-03
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in chemical and petrochemical industries, equipment operating under high temperature, high pressure (or negative pressure) and strong corrosive environment conditions, the anticorrosion performance of the above-mentioned anticorrosion coatings is not ideal, and fluororesin coatings have good anticorrosion properties. Corrosion, anti-fouling performance and heat resistance, gaining people's favor
[0004] However, because fluororesin coatings also have many disadvantages, such as: weak combination with metal, poor coating construction process, plus slender metal tubes, small operating space, and high difficulty, fluororesin coatings can be used on slender metals. There are still great difficulties in the practical application of the tube

Method used

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  • Method for painting fluoro resin inside slender metal tube
  • Method for painting fluoro resin inside slender metal tube
  • Method for painting fluoro resin inside slender metal tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Cleaning in the slender metal tube; cleaning devices such as figure 1 .

[0036]Put the slender metal tube 1 into a high-temperature furnace at a temperature of 300°C for 2 hours, then send the sandblasting and carrier gas to the spray nozzle of the sandblasting gun 3 through the sand delivery pipe 2 extending into the slender metal tube 1 , the wind pressure of the carrier gas is 0.25MPa, the particle size of the sandblasting is 0.3-1.0mm, the linear velocity of the carrier gas ejected from the nozzle is 300 m / s, and the content of the sandblasting in the carrier gas is 200-500 kg / m 3. Starting from the top of the elongated metal pipe 1, the sandblasting gun 3 moves in the opposite direction at a speed of 0.01-0.03 m / s. After sandblasting and cleaning, the inner surface of the elongated metal pipe has a roughness of 10 μm; the depth of the anchor pattern reaches 100μm;

[0037] Said elongated metal pipe 1 is selected from seamless carbon steel pipes, the outer di...

Embodiment 2

[0047] Cleaning and spraying equipment are as embodiment 1.

[0048] (1) Cleaning inside the slender metal tube;

[0049] Put the slender metal tube 1 into a high-temperature furnace at a temperature of 300°C for 2 hours to burn off the oil, and then send the sandblasting and carrier gas to the sandblasting gun through the sand delivery tube 2 extending into the slender metal tube 1 3 sprayed from the nozzle, the wind pressure of the carrier gas is 0.4MPa, the particle size of the sandblasting is 0.3 ~ 1.0mm, the linear velocity of the carrier gas ejected from the nozzle is 350 m / s, and the content of the sandblasting in the carrier gas is 300 kg / m3, from the top of the slender metal pipe 1, the sandblasting gun 3 moves in the opposite direction at a speed of 0.03 m / s. After sandblasting, the inner surface of the slender metal pipe has a roughness of 10 μm and anchor lines The depth reaches 60μm;

[0050] Said elongated metal pipe 1 is selected from seamless carbon steel pip...

Embodiment 3

[0059] Cleaning in the elongated metal tube is the same as in Example 1.

[0060] use as image 3 Electrostatic spraying device for spraying:

[0061] The air with a pressure of 0.2MPa will send the EK1959DGN fluorine paint to the muzzle of the electrostatic spray gun 8 with a diversion cup through the powder delivery pipe 7 extending into the slender metal pipe 1, and the angle α of the nozzle outlet is 45°; the electrostatic spray gun 8 is connected to the negative pole of the DC power supply 9, and the slender metal tube 1 is connected to the positive pole of the DC power supply 6, and the EK1959DGN fluorine paint sprayed from the muzzle of the electrostatic spray gun 8 is adsorbed on the inner wall of the slender metal tube, The voltage of the DC power supply 6 is 80KV, and the content of the solvent having the primer resin dissolved in the gas ejected from the muzzle is 2 kg / m 3 carrier gas, and the linear velocity of the gas ejected from the muzzle of the electrostatic ...

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Abstract

The invention discloses a method for plating fluoro-resin in the elongated metal pipe. The invention uses the method for high pressure airless spraying or static plating to plate the polytetrafluoroethylene or fusible polytetrafluoroethylene on the inner wall of elongated metal pipe, while the invention has high plating efficiency, the spray fog without compressed airflow, wider application of paint viscidity, high paint availability ratio, and lower environmental pollution. Since the airflow diffusion function of air spraying is avoided, the plating fog has lower diffusion; since the thinner when spraying solid coating is used little, the volatilization of solvent is lower, therefore, the working condition is improved, the invention can be processed in room temperature, the availability ratio of paint can be above 95%, and the plating film is thinner (50-100ª–m). The invention can form a continuous smooth paint film on the surface of work-piece and it can be automatically produced.

Description

technical field [0001] The invention relates to a method for coating anti-corrosion materials in metal pipes, in particular to a method for coating fluororesin in elongated metal pipes. Background technique [0002] Metal tubes, especially slender metal tubes, are an important basic material, often used in the preparation of heat exchangers and other equipment, and heat exchangers are the most commonly used chemical equipment, and most of the substances in contact with them are high-temperature liquid phases , gas phase or multi-phase corrosive medium, the operating environment is harsh, so the corrosion is serious, which has brought serious losses to the enterprise. To solve the corrosion of heat exchangers, the most important thing is to solve the problem of corrosion resistance of metal pipes. Among them, the corrosion resistance of slender metal pipes is an urgent problem to be solved due to the particularity of their structure. [0003] Coating anti-corrosion materials...

Claims

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Application Information

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IPC IPC(8): B05D7/22B05D3/00B08B3/02B08B9/027
Inventor 马玉录曾为民林营于新海
Owner EAST CHINA UNIV OF SCI & TECH
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