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Fused-bonded epoxy powder paint with high resistance to cathodic disbonding

A technology of sintered epoxy powder and cathodic stripping, applied in powder coatings, epoxy resin coatings, anti-corrosion coatings, etc. Anti-cathodic disbondment performance, increase toughness, reduce the effect of internal stress

Inactive Publication Date: 2012-09-05
SHANGHAI HILONG ANTI CORROSION TECH ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this combined application is beneficial to pipeline anti-corrosion, the electrochemical reaction in cathodic protection can easily cause corrosion of anti-corrosion coatings, especially the decrease of the bonding force between anti-corrosion coatings and metals, resulting in cathodic disbonding and the appearance of coatings. layer blisters and causes cracking, which eventually destroys the anti-corrosion effect of the coating

Method used

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  • Fused-bonded epoxy powder paint with high resistance to cathodic disbonding
  • Fused-bonded epoxy powder paint with high resistance to cathodic disbonding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] This embodiment demonstrates the preparation method of the fusion-bonded epoxy powder coating with high cathodic disbonding resistance performance of the present invention. First, configure the raw materials with the following proportioning:

[0023] Hengyuan 605 phenolic epoxy resin

[0024] After the batching is completed, add the above raw materials into the high-speed mixer, mix at high speed for 8 minutes, and then put the premixed material into the extruder for melt extrusion. The temperature of the feeding section is 25°C, the temperature of the melting section is 90°C, and the temperature of the meshing section is 100°C. The section temperature is 95°C, and the residence time is 45s; the molten material is pressed by a tablet machine, and the thickness is controlled at 2mm, and then sent to a mill for crushing and grading, and the superfine powder is separated by a cyclone separator and the product is separated by a powder sieve. The sieve is 80-120 mes...

Embodiment 2

[0026] A formulation of high resistance to cathodic disbonding performance fusion-bonded epoxy powder coating is as follows:

[0027] Hongchang 904H epoxy resin

[0028] Manufacturing method is the same as embodiment 1.

Embodiment 3

[0030] A formulation of high resistance to cathodic disbondment fusion-bonded epoxy powder coating is as follows:

[0031] 1004 epoxy resin

50.00kg

Phenolic hydroxyl resin

11kg

Titanium dioxide

8.00kg

Silica powder

10.00kg

Precipitated Barium Sulfate

10.00kg

Phthalo blue

0.15kg

Iron oxide yellow

0.70kg

[0032] Benzoin

0.50kg

3048 leveling agent

1.00kg

RK84L

2.80kg

[0033] Manufacturing method is the same as embodiment 1.

[0034] The high resistance to cathodic disbonding performance fusion-bonded epoxy powder coating obtained by the foregoing embodiments can reach the following technical indicators:

[0035] Table 1 Performance indicators of fusion bonded epoxy powder coatings

[0036]

[0037] The performance index of the fusion-bonded epoxy powder coating formed by the high resistance to cathodic disbonding performance fusion-bonded epoxy po...

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Abstract

The invention provides fused-bonded epoxy powder paint with high resistance to cathodic disbanding. The paint comprises the following components in percentage by weight: 50 to 60 percent of novolac epoxy resin, 10 to 13 percent of curing agent, 25 to 32 percent of filler, 0.5 to 1 percent of pigment, 0.5 to 1 percent of benzoin, 0.4 to 1 percent of leveling agent, and 0.5 to 3 percent of toughening agent. The paint provided by the invention has the advantage of improving the heat resistance, boiling resistance, bending resistance, impact resistance and other performance of powder coatings while improving the resistance to cathodic disbanding.

Description

technical field [0001] The invention relates to pipeline anticorrosion coatings for oil and gas transmission projects, in particular to a fusion bonded epoxy powder coating with high cathodic stripping resistance performance. Background technique [0002] In the pipeline anticorrosion method, the combination of anticorrosion coating layer and cathodic protection is often used, so that the metal structure of the pipeline can obtain the most economical and effective protection. Although this combined application is beneficial to pipeline anti-corrosion, the electrochemical reaction in cathodic protection can easily cause corrosion of anti-corrosion coatings, especially the decrease of the bonding force between anti-corrosion coatings and metals, resulting in cathodic disbonding and the appearance of coatings. The layer blisters and causes cracking, which eventually destroys the anti-corrosion effect of the coating. Therefore, when the anti-corrosion coating layer and cathodic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D163/04C09D7/12C09D5/08C09D5/03F16L58/10
Inventor 任雪方军锋粟鹰孙健
Owner SHANGHAI HILONG ANTI CORROSION TECH ENG
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