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Anticorrosion epoxy powder paint used outside marine steel pipe pile

An epoxy powder, steel pipe pile technology, applied in anti-corrosion coatings, epoxy resin coatings, coatings, etc., can solve the problems of poor protection performance, marine biofouling, easy peeling of coatings, etc., and achieve good scratch resistance. sexual effect

Active Publication Date: 2012-01-25
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the above anti-corrosion coatings have poor self-protection performance, and they only have a life span of 5 to 20 years in the marine environment. In the tidal zone and splash zone, the coating fails faster due to long-term erosion and impact factors. Due to the overprotection effect of cathodic protection in the full immersion area or submud area, the coating is easy to peel off under the damage of hydrogen evolution and alkaline degradation, and marine organisms are easy to adhere to cause fouling and other effects, and the anti-corrosion life of the coating is not ideal requirements

Method used

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  • Anticorrosion epoxy powder paint used outside marine steel pipe pile
  • Anticorrosion epoxy powder paint used outside marine steel pipe pile
  • Anticorrosion epoxy powder paint used outside marine steel pipe pile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 SEBF-6-1

[0027] A marine steel pipe pile external anti-corrosion epoxy powder coating SEBF-6-1, its formula is shown in Table 1.

[0028] The formula (percentage by weight) of table 1 coating SEBF-6-1

[0029]

[0030] The surface roughness of the coating SEBF-6-1 is equivalent to the roughness of the original material of the steel pipe pile, and the surface roughness is adjustable. When the coating thickness is ≥300um, the roughness is about 30-80um, and the Keep the overall flatness to meet the marine geological conditions where the steel pipe piles and steel pipe piles are located - the embedded strength required by sandy soil, silty sand, etc., and the coating has good scratch resistance, bacterial degradation resistance, and cathodic stripping resistance Good, strong chemical resistance.

[0031] The coating is mainly used in the submud area of ​​marine steel piles, and the thickness of a single layer of SEBF-6-1 epoxy powder coating is generally ≥...

Embodiment 2

[0032] Example 2 SEBF-6-2

[0033] A marine steel pipe pile external anti-corrosion epoxy powder coating SEBF-6-2, its formula is shown in Table 2.

[0034] The formula (percentage by weight) of table 2 coating SEBF-6-2

[0035]

[0036] The SEBF-6-2 high-strength mechanical coating is applied on the outside of the coating SEBF-6-1 to form a double-layer composite structure that is more scratch-resistant, impact-resistant and wear-resistant. SEBF-6-2 coating has a scratch performance of less than 150μm for a scratch head with a diameter of 2.0mm under a load of 30kg, which exceeds the general anti-scratch coating. The coating has good resistance to seawater penetration, erosion resistance and wear resistance , impact resistance, marine biofouling resistance.

[0037] The coating is mainly used on the outside of the double-layer structural coating in the underwater area of ​​marine steel piles. The SEBF-6-1 and SEBF-6-2 form a double-layer epoxy powder coating: the bottom ...

Embodiment 3

[0038] Example 3 SEBF-6-3

[0039] A marine steel pipe pile external anti-corrosion epoxy powder coating SEBF-6-3, its formula is shown in Table 3.

[0040] The formula (percentage by weight) of table 3 coating SEBF-6-3

[0041]

[0042] Use SEBF-6-3 high-strength mechanical properties and anti-ultraviolet (wavelength 250-370nm) aging coating, coated on the coating SEBF-6-1 and SEBF-6-2 to maintain good compatibility and Wholeness. The SEBF-6-3 coating has passed 29 aging test cycles, and the coating has no cracks or blisters. After modified SEBF-6-3 powder coating, the anti-aging performance is more than 2 times higher than that of similar coatings. At the same time, under the load of 50kg, the scratch resistance of the scratch head with a diameter of 2.0mm can reach below 250μm, which is twice as good as that of ordinary scratch-resistant coatings. The coating has good impact and abrasion resistance and is resistant to marine biofouling. The coating is suitable for t...

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Abstract

The invention provides an anticorrosion epoxy powder paint used outside a marine steel pipe pile, which is characterized in that, the formula of the anticorrosion epoxy powder paint comprises the following components in percentage by weight: 40-60 percent of phenol-modified epoxy resin, 0-20 percent of bisphenol A epoxy resin, 0-20 percent of linear phenol curing agent, 5-25 percent of phenol curing agent, 0.3-1.5 percent of 2-phenylimidazole, 0.2-1 percent of silane coupling agent, 0.2-3 percent of gas phase white carbon, 0-2 percent of hydroxy-phenyl benzotriazole ultraviolet absorbent and hindered amine light stabilizer, 0-5 percent of modified polyfluortetraethylene wax, 5-25 percent of glass powder, 5-30 percent of talcum powder, silicon powder and mica powder, 5-10 percent of aluminium triphosphate, iron red, rutile titanium pigment and cuprous oxide and 0-3 percent of pigment. The paint provided by the inventon has the advantages that the surface roughness of a coating satisfies the required built-in strength of a steel pile and the marine geological condition of the steel pile, and the paint has the characteristics of excellent scratch resistance, shock resistance, abrasion resistance, marine biological fouling resistance, ageing resistance, ultraviolet irradiation resistance and the like.

Description

technical field [0001] The present invention relates to the anti-corrosion technology of marine engineering steel structure, specifically, generally refers to the long-term anti-corrosion technology of the outer wall of steel pipe piles and steel sheet piles. Background technique [0002] Steel piles, including steel pipe piles and steel sheet piles, are metal structure support materials widely used in marine foundation projects such as piers, bridges, offshore platforms, and wind power stations. Due to the harsh corrosion environment of the ocean, steel piles made of ordinary steel The annual corrosion rate reaches 1-2 mm / year, and the rate of pitting corrosion due to defects caused by the manufacturing and installation process and the local corrosion caused by the residence of marine organisms is several times greater than that of uniform corrosion. The earliest service life of 20 to 30 years has been increased to the durability requirement of more than 100 years. It is ur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D163/00C09D5/08
Inventor 陆卫中李京史杰智高英李晓东张立新
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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