KR20150087016A - Method on Painting for Anticorrosion of Sea Windforce Ironpipe by Metaloxide Sol - Google Patents

Abstract

The present invention relates to a coating method capable of significantly decreasing the maintenance costs of wind turbines. The coating method uses a nano-ceramic anticorrosive agent including inorganic nanomaterials which is not harmful to the human body, prevents the discoloration, and has excellent corrosion resistance and durability to coat the surface of an offshore wind power steel pipe to prevent from being peeled off and coat the steel pipe for an extended period of time. The method includes: a preprocessing step of using a manual scrapper to preprocess the corrosion parts on the surface of the offshore wind power steel pipe; and an upper, middle, and lower part processing step of coating a ceramic corrosion prevention agent onto the upper, middle, and lower parts respectively.

Description

TECHNICAL FIELD [0001] The present invention relates to an anticorrosion coating for a steel pipe,

More particularly, the present invention relates to an anti-corrosive coating method of a marine wind power steel pipe using a metal oxide sol, and more particularly, to a method of coating an inorganic nanomaterial which is harmless to a human body when coated on a surface of an offshore wind power steel pipe and is excellent in corrosion resistance and durability The present invention relates to a coating method capable of coating a steel pipe for a long time without being easily peeled off by using a nanoceramic anticorrosion agent, thereby greatly reducing the maintenance cost of the wind power generator.

Since wind power generation uses pollution-free and infinite winds scattered everywhere, it has little impact on the environment and is clean energy that can efficiently utilize the land. In the case of large-scale wind power generation complexes, And thus it is an infinite clean energy that is particularly well received in renewable energy resources.

As the development of offshore wind power with better power generation efficiency compared to onshore wind power and the development of offshore wind power is on the rise, offshore wind power was constructed on the basis of 1.3GW offshore wind power generation in 2010 and a total of 19.1GW offshore wind power generation The offshore wind market is expected to grow mainly in Europe (UK and Germany), and the offshore wind market is expected to form in Asia, centered on China. In Europe, 13.4 GW will be installed by 2015, and 4.6 GW in Asia, with China expected to have a capacity of 4.5 GW.

In Korea, the sea is composed of three sides, and marine wind power is advantageous compared to the land-based on-land wind power of narrow land, so efforts are being made to install offshore wind power.

On the other hand, most of the steel pipes used for wind power generation are composed of steel and concrete. In case of offshore wind, it is hard to find the case where the steel pipe is oxidized. However, in the case of offshore wind power, , It is common that the steel pipe made of steel is oxidized and rusted.

Conventionally used methods for corrosion prevention of steel structures are coating various kinds of paints on the surface of steel as shown in Fig. 1 to block harmful factors such as moisture, air, salt, and sulfurous acid gas penetrating from the outside, . Such a coating method can perform the function of preventing corrosion at the beginning of the execution, but since the durability of the coating film is shorter than the lifetime of the steel, continuous maintenance work is required until the construction period ends to prevent corrosion of the structure. It should be done. In addition, since the environmental conditions in which the structures are located differ from each other due to the nature of civil engineering structures, it is necessary to use suitable materials. However, since most of the currently used materials are used without considering these environmental characteristics, The difference in life span is largely generated.

The coating method used in the past is to provide coating performance such as removal of paint film, additional corrosion, and cracking when the rust removal and old paint film treatment is not perfect when maintenance painting is performed for maintenance Corrosion of the surface of the steel material can be prevented as shown in Fig. 1, and the coating film formed on the surface of the steel material blocks moisture, air and harmful factors to prevent corrosion of the steel material .

Epoxy coatings having good resistance to chemical substances and difficulty in penetration of water are most commonly used as corrosion inhibitors for steel pipes, but in the case of epoxy coatings, the cost of raw materials is high, and weather resistance and light resistance are poor. The preprocessing operation is complicated and the operation cost is also increased. In addition, since it contains harmful substances such as bisphenol A, it is not environmentally friendly and has a disadvantage in that it is not suitable as a corrosion inhibitor because the particle size is not constant.

As a conventional technique for preventing the corrosion of offshore wind power tubes, Patent Application No. 10-2013-1136837 is made of a flat plate structure made of polycarbonate, and a protective film made of a neutral material or acrylic material is coated on the outside, A molding body having an engaging end bent at an end thereof; A vertical watertight member provided on a surface where the respective engagement ends contact with each other; A reinforcing member provided on the other surface of the coupling end facing the vertical watertight member; A gap member coupled along the upper and lower sides with respect to a state in which the mold body is wound on the steel pipe pile so that a narrow and constant gap is formed between the inner surface of the mold body and the outer surface of the steel pipe pile; A horizontal watertight member coupled to upper and lower ends of the mold body adjacent to the gap member; The protective film coated on the mold body includes an outer surface contacting the seawater and an inner surface contacting the corrosion preventive mortar, and an acrylic type 1 And a secondary film is joined to the inner surface by a sheet made of polyethylene resin (Polyethylen Terephthalate), polypropylene resin or vinyl using an acrylic adhesive agent. However, this is only a polycarbonate mold for application of corrosion preventive mortar for marine steel pipe file, which is a big difference from the method for directly coating offshore wind power structure.

Therefore, it is necessary to develop a new painting technique that can greatly reduce the maintenance cost of the steel pipe for wind power generation because it can coat the steel pipe for a long time without being easily peeled off.

Disclosure of the Invention The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a nanoceramic composite anti-corrosive agent containing inorganic nanomaterials which are harmless to human bodies, And it is an object of the present invention to provide a coating method which can remarkably reduce the maintenance cost of a wind power generator because it can coat a steel pipe for a long time without being easily peeled off.

The present invention relates to: 1) a pretreatment step of pretreating a surface of a steel pipe for offshore wind power generation using a hand tool scraper, a grinding paper or a wire brush to a corrosion site, a horny site and a concavo-convex site; 2) The mixture of silane and silane coupling agent was mixed at a weight ratio of 7: 1, isopropanol was added, and a metal oxide sol of nanometer size was added dropwise with stirring at 80 DEG C for 24 hours. The pH was adjusted with acetic acid, A step of applying a ceramic anti-corrosive agent for a floor to a thickness of 50 to 60 탆, and 3) a step of applying a ceramic anti-corrosive agent for a medium-to-high temperature range of 80 to 100 탆 4) After the above-mentioned intermediate treatment step, the ceramic anti-corrosive agent for the underfill is coated with a ceramic anti-corrosive agent containing fluorosilane in a thickness of 70 to 80 μm The present invention also provides an anti-corrosive coating method for a marine wind power generator steel pipe.

The present invention also relates to a process for the production of the above alkoxysilane wherein the alkoxysilane is selected from the group consisting of dimethyldimethoxysilane (DMDMS), methyltriethoxysilane (MTMS), tetramethoxysilane (TMOS), tetraethoxysilane (TEOS), diphenyldiethoxysilane And diphenyldimethoxysilane (DPDMS). The present invention also provides a method of coating a corrosion-resistant steel pipe for offshore wind power generation.

The present invention also relates to a process for producing a silane coupling agent, wherein the silane coupling agent is selected from the group consisting of N- (? -Aminoethyl) -? - aminopropylmethyldimethoxysilane, 3-aminopropyltriethoxysilane and bis- (? -Trimethoxysilylpropyl) The present invention also provides a method for coating a corrosion-resistant steel pipe on an offshore wind turbine.

Further, the present invention relates to a fluorine-containing silane compound, wherein said fluorine silane is selected from heptadecafluorodecyltrimethoxysilane, heptadecafluorodecyltriisopropoxysilane, tridecafluoro-1,1,2,2-tetrahydrooctyltriethoxysilane The present invention provides an anti-corrosive coating method for a marine wind power generator steel pipe.

Finally, the present invention provides a method for coating a corrosion-resistant steel pipe on an offshore wind turbine, wherein the metal oxide sol is selected from the group consisting of silica sol, alumina sol, and titania sol.

Since the corrosion prevention coating method of the offshore wind power steel pipe using the metal oxide sol according to the present invention uses an inorganic material such as nano-sized silica and a ceramic corrosion agent containing fluorine, inorganic nanomaterials It is harmless to the human body even when it is dissolved in seawater because it is used, and it is not discolored, and has excellent corrosion resistance and durability.

In addition, it is possible to coat the steel pipe for a long time without being easily peeled off by using the ceramic anti-corrosive agent, which can greatly reduce the maintenance cost of the wind power generator.

[Fig. 1] is a schematic diagram showing the prevention of corrosion by coating of the surface of a steel material.

The anti-corrosion coating method of the offshore wind power steel pipe using the metal oxide sol will be described in detail below with reference to the accompanying drawings (FIG. 1).

The corrosion protection coating method of the offshore wind power generation steel pipe according to the present invention comprises: 1) a surface pretreatment step of pretreating a corrosion part, a horny part and a concavo-convex part on the surface of a steel pipe for offshore wind power generation using a hand tool scraper, , 2) mixing the alkoxysilane and the silane coupling agent in a weight ratio of 7: 1 to the steel tube pretreated in the surface pretreatment step, adding isopropanol, dropping the metal oxide sol of nanometer size while stirring at 80 DEG C, and reacting for 24 hours 3) After applying a ceramic treatment agent for various colors, various colors of inorganic pigments are added to the ceramic treatment agent. And 4) after the intermediate treatment step, the ceramic anti-corrosive agent containing fluorosilane And a top treating step of applying a topping ceramic anticorrosion agent to a thickness of 70 to 80 탆.

The anti-corrosion coating method of a marine wind power generation steel pipe according to the present invention is a method of coating the surface of the offshore wind power generation steel pipe with ceramic anticorrosive agents by sequentially performing a surface pretreatment step, a submerged treatment step, an intermediate treatment step and a top treatment step . Hereinafter, the present invention will be described in detail.

1) Surface preparation of steel pipe

The surface preprocessing step of the steel pipe is to clean the surface to remove the waterproofing, the performance and the defects that impede the construction, which are present on the surface of the steel pipe for offshore wind power generation. A loose rust and a coating film are removed by using a hand tool scraper, a polishing paper, a wire brush, or the like on the surface of the substrate to be coated, the corrosion area, the excited area,

 2) Manufacture of Ceramic Flooring Agent

280 g of alkoxysilane and 40 g of aminosilane as a silane coupling agent were mixed with a 5-liter reactor equipped with a stirrer, a condenser and a stirrer, 160 g of isopropanol was added, and stirred at 80 DEG C for 1 hour to obtain silica sol (30 wt% 60 g of titania sol having an average particle size of 10 nm and 40 g of alumina sol were gradually added dropwise. After dropping all of them, acetic acid was added in an appropriate amount to adjust the pH to 4, and the reaction was continued for 24 hours, followed by aging for 5 days to obtain a ceramic anti-corrosive agent.

The alkoxysilane can be selected from among methyltriethoxysilane (MTMS), tetramethoxysilane (TMOS), tetraethoxysilane (TEOS), diphenyldiethoxysilane (DPDES), diphenyldimethoxysilane have. The aminosilane as the silane coupling agent may be selected from among N- (? -Aminoethyl) -? - aminopropylmethyldimethoxysilane, 3-aminopropyltriethoxysilane and bis- (? -Trimethoxysilylpropyl) amine .

When the alkoxysilane is mixed with the silane coupling agent, the weight ratio of the alkoxysilane to the silane coupling agent is preferably 7: 1. When the weight ratio of the alkoxysilane and the silane coupling agent exceeds 7: 1, There arises a problem of stability. When the weight ratio is less than 7: 1, not only the adhesion to various substrates is reduced but also the penetration resistance to sodium ions is lowered.

3) Manufacture of ceramic anti-static agent

Modified ceramic anti-corrosive agents are prepared by adding inorganic pigments of various colors to ceramic anti-corrosive agents for undercoats.

4) Manufacture of ceramic anti-corrosion agent

Ceramic anticorrosive for topical application was prepared by adding 12g of fluorosilane to ceramics anticorrosive for undercoating, adding 10g of trimethylamine as a curing catalyst and aging at room temperature for 5 days.

The fluorosilane used in the preparation of the ceramic anti-corrosive agent has the smallest intermolecular attraction and low surface energy among all the compounds. It has not having a group -CF ₃ for example, and critical surface tension 6dyne / cm, a methyl group (-CH ₃₎ is a critical surface tension of 22 ~ 24 dyne / cm-environment, -CF ₃ having a methyl group (-CH ₃₎ The surface coating layer exhibits excellent water repellency and oil-repellent effect when coated on the surface at a level of 1/4. In addition, although fluorine silane has antifouling performance and anti-adherence performance, fluorine silane is expensive, so economical problem should be considered. On the other hand, introduction of a catalyst is required for promoting the condensation reaction and storage stability of the coating agent. As the catalyst, there are an acid, a base and a metal organic compound, and a balance between storage stability and curing rate is good. Sodium acetate, potassium acetate and quaternary ammonium carboxylate, trimethylamine, and colloidal silica having a basic pH such as pyridine. The fluorine silane uses heptadecafluorodecyltrimethoxysilane, heptadecafluorodecyltriisopropoxysilane, and tridecafluoro-1,1,2,2-tetrahydrooctyltriethoxysilane.

If less than 50 占 퐉 is applied in the lower treatment step among the various treatment steps, sufficient adhesion is not caused between the ceramic coating agent for the undercoat and the steel pipe surface and the adhesion strength is lowered. In addition, (2 ~ 3 times coating is required) The surface roughness is weak and the adhesive strength is low. When the coating is applied less than 80 탆 in the coating process twice in the intermediate treatment step, the adhesion and the hiding power with the treated surface become poor, and a wrinkle phenomenon occurs when the coating is 100 탆 or more. Lastly, when it is applied less than 70 탆 in the top coat treatment step, the weather resistance and water permeability are lowered, and when the coating is applied over 80 탆, the coating thickness becomes thick, and cracking phenomenon may occur.

Hereinafter, the present invention will be described in greater detail with reference to the following examples. It is to be understood that the following examples are for illustrative purposes only and are not intended to limit the scope of the present invention .

First, a surface pretreatment was performed to remove the corrosion part, excavated part and irregular part by using a hand tool scraper on the surface of the offshore wind power generation steel pipe. Secondly, the above-mentioned ceramic anti- The coating was applied once on the surface of the steel pipe whose surface was pretreated with a coating thickness of 55 탆.

Third, in the intermediate treatment step, the above-mentioned medium-type ceramic anti-corrosive agent can be used as a brush, a roller, and a spray, and the thickness of the coating is 90 탆, and the airless or paint gun is used as a construction device.

Lastly, in the top treatment step, the above-mentioned ceramic anti-corrosive agent can be used as a brush, a roller, and a spray, and the thickness of the coating is 75 쨉 m, sprayed once, and airless or paint gun is used as a construction apparatus.

A ceramic anticorrosive for undergarment was applied in a thickness of 60 占 퐉 instead of 55 占 퐉 and an intermediate ceramic anticorrosion agent was applied in a thickness of 80 占 퐉 instead of 90 占 퐉, Was coated at 80 占 퐉 instead of 75 占 퐉.

The ceramic anticorrosive for undergarment was applied in a thickness of 65 占 퐉 instead of 55 占 퐉 and the intermediate ceramic anticorrosion agent was applied in a thickness of 75 占 퐉 instead of 90 占 퐉, Was coated at 85 탆 instead of 75 탆.

Comparative Example)

A coating agent was prepared using a commercially available epoxy resin, and then coated on a steel material.

The performance tests on the test pieces prepared in Examples 1, 2, 3 and Comparative Examples were carried out as follows.

≪ Test Example 1 > Salt spray test

0.22 g of copper (II) chloride was added to 1 L of the test salt solution to prepare a salt spray test solution. In principle, the spray was free fall, and the direct spray was blocked by directing the spray toward the spray nozzle in such a direction that the spray was not directly applied to the test piece. After 1,000 to 6,000 hours of testing, the specimens were carefully removed from the test bath and the specimens were immediately dried for 0.5 to 1.0 hours. In order to remove the sodium chloride adhering to the surface of the test piece, the test piece was washed with water at a temperature of 15 to 40 ° C and immediately dried. In the case of removal of corrosion products, the removal depends on mechanical methods such as brushing, ultrasonic irradiation, fine particle spraying, water spraying, chemical methods and electrolytic methods, or a combination of these methods. The shape after the test and the shape after the removal of the corrosion product were checked to confirm the abnormality. The results are shown in Table 1 below.

≪ Test Example 2 >

If there is light dust or contaminants on the test surface to be measured according to ASTM D 4541 test method, surface the surface with sandpaper of 400mesh or more and put the adhesive on Dolly and attach it to the surface of the coated film. I gave it back. After the adhesive had cured sufficiently, the periphery of the dolly was cut so as to touch the steel according to the standard of ISO 4624, and the maximum adhesion strength was measured by lifting the dolly in the vertical direction. The results are shown in Table 1 below.

<Analysis of Test Results>

As shown in Table 1, which is a performance comparison table as a result of various tests for Examples 1 to 3 and Comparative Examples, the coating amount of the ceramic anticorrosion agent according to the anticorrosion coating method of the off- And Examples 1 and 2 within the range of the present invention have excellent performance both in the salt spray test and in the adhesion strength as compared with Example 3 and Comparative Example which are outside the ranges. In particular, the comparative example shows a very low result in the salt spray test The corrosion resistance is remarkably low, and it can be seen that Examples 1 and 2 have excellent corrosion resistance.

Claims (5)

1) a pretreatment step of pretreating a corrosion part, a horny part and a concavo-convex part on the surface of a steel pipe for offshore wind power generation using a hand tool scraper, a grinding paper, and a wire brush,
2) Alkoxysilane and a silane coupling agent were mixed in a weight ratio of 7: 1 to a steel pipe pretreated in the pretreatment step, then isopropanol was added, and a metal oxide sol having a nanometer size was dropped while stirring at 80 DEG C, And then aging for 5 days, and then applying a ceramic anti-corrosive agent to the substrate in a thickness of 50 to 60 μm,
3) after the above-mentioned undercoating step, a middle treatment step of applying a medium-thickness ceramic anticorrosion agent with an inorganic pigment of various colors to the ceramic anticorrosion agent for the undercoat in a thickness of 80 to 100 탆,
4) a top treatment step of applying a ceramic anticorrosion agent for phase-in-phase containing fluorosilane to the ceramic anti-corrosive agent for the undercoat layer to a thickness of 70 to 80 탆 after the intermediate treatment step; Method.
The method according to claim 1,
The alkoxysilane may be at least one selected from the group consisting of dimethyldimethoxysilane (DMDMS), methyltriethoxysilane (MTMS), tetramethoxysilane (TMOS), tetraethoxysilane (TEOS), diphenyldiethoxysilane (DPDES), diphenyldimethoxy Silane (DPDMS). &Lt; / RTI &gt;
3. The method of claim 2,
The silane coupling agent is any one selected from among N- (? -Aminoethyl) -? - aminopropylmethyldimethoxysilane, 3-aminopropyltriethoxysilane and bis- (? -Trimethoxysilylpropyl) amine Corrosion preventive coating method of offshore wind power generation steel pipe.
The method of claim 3,
The fluorine silane is any one selected from heptadecafluorodecyltrimethoxysilane, heptadecafluorodecyltriisopropoxysilane, and tridecafluoro-1,1,2,2-tetrahydrooctyltriethoxysilane. Corrosion protection coating method of offshore wind power steel pipes characterized by.
The method according to claim 4, wherein the metal oxide sol is any one selected from the group consisting of silica sol, alumina sol, and titania sol.

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