KR20200000101A - Anti-corrosive coating composition and anti-corrosion layer using the same - Google Patents

Abstract

An embodiment relates to an anticorrosive coating composition having improved weldability and antirust property, and to an anticorrosion film formed using the same, wherein the anticorrosive coating composition comprises a first liquid and a second liquid, and the first liquid comprises an alkyl silicate resin, The second liquid comprises zinc powder and aluminum tripolyphosphate, and the zinc powder content is 18 to 40% by weight based on the total weight of the rustproof coating composition.

Description

Anti-corrosive coating composition and anti-corrosion membrane using the same {ANTI-CORROSIVE COATING COMPOSITION AND ANTI-CORROSION LAYER USING THE SAME}

The present invention relates to an anticorrosive coating composition having improved weldability and antirust property and an antirust film using the same.

The anticorrosive coating composition is generally referred to as a shop primer, a prefabrication primer or a first anti-corrosive primer. Such an anticorrosive coating composition is a material in which the steel structure is exposed to the atmosphere and corrodes. It is used to coat steel, which is raw material, to prevent it.

Various anticorrosive paints containing rust preventive pigments are known. Among them, a high zinc paint containing a large amount of zinc powder and a binder is widely used as a temporary anticorrosive paint for large reinforced structures such as ships and bridges.

However, the zinc powder contained in the high zinc paint improves the rust resistance but at the same time increases the white rust to reduce the adhesion with the over-coating composition coated thereon. In addition, the generation of defects such as pits and blow holes due to the gas and smoke generated while zinc is vaporized or oxidized during welding.

In addition, when the zinc high content paint is coated with a thickness of about 15 to 20 μm to maintain physical properties, volatile organic compounds (VOCs) generated from the painted paints average about 48 g / m ² per unit area. There is a problem that a large amount is discharged.

In recent years, the need for eco-friendly paints is gradually increasing. Therefore, VOC emissions from paints should be reduced. Therefore, a method of reducing the total thickness of the paint and reducing the total VOC emissions by reducing the film thickness has been proposed. However, if the thickness of the coating is reduced to reduce the VOC emissions, the zinc content in the coating is reduced, which causes a problem of deterioration in rust prevention.

SUMMARY OF THE INVENTION An object of the present invention is to provide an anticorrosive coating composition and an anticorrosion film using the same, which have improved anti-corrosion property and weldability even at an equivalent level or a thinner film thickness, and which can reduce VOC emissions by reducing the total amount of the paint.

The anti-corrosive coating composition according to an embodiment includes a first liquid and a second liquid, the first liquid includes an alkyl silicate resin, and the second liquid includes zinc powder and aluminum tripolyphosphate. In addition, the content of the zinc powder is 18 to 40% by weight based on the total weight of the antirust coating composition.

Antirust film according to another embodiment is formed of the antirust coating composition.

The antirust coating composition according to the invention has improved rust resistance and weldability even at equivalent or thinner coating thicknesses.

In addition, the use of the rust-preventive coating composition according to the present invention can reduce the thickness of the coating film can reduce the amount of organic solvent used, it is possible to reduce the VOC emissions and environmentally friendly.

Hereinafter, the present invention will be described in detail through embodiments. The embodiments are not limited to the contents disclosed below and may be modified in various forms as long as the gist of the invention is not changed.

"Including" in the present specification means that it may further include other components unless otherwise specified.

In addition, all numbers and expressions indicating amounts of components, reaction conditions, and the like described herein are to be understood as being modified in all instances by the term "about" unless otherwise specified.

In the present specification, terms such as first and second are used to describe various components, and the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component into another.

The present invention provides an anticorrosive coating composition having improved weldability and antirust property and an antirust film formed therefrom.

The antirust coating composition according to one embodiment includes a first liquid and a second liquid.

The antirust coating composition is a two-component anticorrosive coating composition.

The first liquid contains an alkyl silicate resin.

Since the alkyl silicate resin is included in the rust-preventive coating composition of the present invention, the alkyl silicate resin directly bonds to the zinc powder and the steel to increase adhesion and adhesion.

The content of the alkyl silicate resin is 10 to 40% by weight based on the total weight of the first liquid. Specifically, the content of the alkyl silicate resin may be 15 to 30% by weight or 20 to 30% by weight based on the total weight of the first liquid, but is not limited thereto.

The content of the alkyl silicate resin is 5 to 20% by weight based on the total weight of the antirust coating composition. Specifically, the content of the alkyl silicate resin may be 5 to 15% by weight or 8 to 12% by weight based on the total weight of the antirust coating composition, but is not limited thereto.

Since the content of the alkyl silicate resin satisfies the above range, there is an advantageous effect on the adhesion to the steel and the rust preventing property. Specifically, when the content of the alkyl silicate resin is less than 5% by weight based on the total weight of the rust-preventive coating composition, adhesion with steel is poor, and when the content of the alkyl silicate resin is greater than 20% by weight, the rust resistance is deteriorated.

The alkyl silicate resin is tetramethoxysilicate, tetraethoxysilicate, tetrapropoxysilicate, tetraisopropoxysilicate, tetrabutoxysilicate, tetramethylorthosilicate, tetraethylorthosilicate, tetra-n-propyl ortho At least one member selected from the group consisting of silicates, tetraisopropyl orthosilicates, tetra-n-butyl orthosilicates, tetra-sec-butyl orthosilicates, methyl polysilicates and ethyl polysilicates.

The alkyl silicate resin may be an alkyl silicate hydrolysis condensate.

The silica content of the alkyl silicate resin is 20 to 60% by weight. Specifically, the silica content of the alkyl silicate resin may be 25 to 50% by weight, or 30 to 40% by weight, but is not limited thereto.

The acidity of the alkyl silicate resin is 0.01 to 100 ppm. Specifically, the acidity of the alkyl silicate resin may be 0.01 to 20 ppm, or 0.1 to 10 ppm, but is not limited thereto.

The viscosity of the alkyl silicate resin is 2 to 10 cps at 25 ° C. Specifically, the viscosity of the alkyl silicate resin may be 3 to 8 cps or 4 to 6 cps at 25 ℃, but is not limited thereto.

The specific gravity of the alkyl silicate resin is 0.9 to 1.1. Specifically, the specific gravity of the alkyl silicate resin may be 0.95 to 1.1, or 1.0 to 1.1, but is not limited thereto.

The first liquid may further include a first solvent in addition to the alkyl silicate resin.

The first solvent is included in the anti-corrosive coating composition, and serves to improve wetting and workability, and contributes to hydrolysis to control pot life and shelf life.

Although the first solvent is not particularly limited, specifically, solvents commonly used in the paint field such as water, alcohol solvents, ester solvents, ketone solvents, aromatic solvents, glycol solvents, and the like may be used.

As said alcohol solvent, methanol, ethanol, isopropanol, butanol, etc. are mentioned, for example. As ester solvent, ethyl acetate and butyl acetate are mentioned, for example. As a ketone solvent, methyl isobutyl ketone and cyclohexanone are mentioned, for example. Examples of the aromatic solvents include benzene, xylene, and toluene. As a glycol type solvent, propylene glycol monomethyl ether and propylene glycol monomethyl ether acetate are mentioned, for example.

The said 1st solvent may be used individually by 1 type, or may mix and use 2 or more types.

The first liquid may further include an acid catalyst or an accelerator. In addition, the first liquid may further include an acid catalyst and an accelerator.

The acid catalyst and promoter are used to promote the hydrolysis reaction and at the same time play a role of strengthening strength.

An inorganic acid, an organic acid, etc. can be used as an acid catalyst. As the inorganic acid, hydrochloric acid, hydrofluoric acid, hydrobromic acid, hydroiodic acid, sulfuric acid, sulfurous acid, nitric acid, nitrous acid, chloric acid, perchloric acid, phosphoric acid, and the like can be used, and as organic acids, acetic acid, propionic acid, stearic acid, phthalic acid, salicylic acid can be used. have. These may be used individually by 1 type, and may mix and use 2 or more types.

Acid catalysts generally proceed in a somewhat slower and more controlled manner compared to the partial degradation by using a base. In addition, the presence of acids tends to stabilize reactive silanol (Si-OH) functional groups and increase storage stability.

As the accelerator, zinc chloride, magnesium chloride, dibutyl tin laurate, dioctyl tin laurate, and the like can be used. The maximum amount of accelerator that can be added is limited by the rapid curing negatively affecting the cracking level (internal stress).

The second liquid includes zinc powder and aluminum tripolyphosphate.

Since the zinc powder is included in the rust-preventive coating composition, it acts as a rust-preventive pigment that prevents the rust of the top plate, and zinc powder has a greater tendency to ionize than iron, so that the corrosion of iron is prevented as corrosion occurs first in a corrosive environment. have.

The zinc powder may be used in various shapes such as spherical shape, somewhat irregular particle shape, flake shape, disk shape, needle shape, plate shape, fiber shape and rod shape. For example, the zinc powder may be spherical. At this time, the spherical shape refers to a shape close to the sphere, the aspect ratio is not particularly defined range, but is preferably about 1 to 3.

The average particle diameter of the zinc powder is 1 to 20 µm. Specifically, the average particle diameter of the zinc powder may be 1 to 10 μm, 2 to 8 μm, or 3 to 6 μm, but is not limited thereto.

Specifically, the content of the zinc powder is 18 to 40% by weight based on the total weight of the antirust coating composition. Specifically, the content of the zinc powder may be 18 to 40% by weight, 19 to 40% by weight or 19 to 38% by weight based on the total weight of the rust-preventive coating composition, but is not limited thereto.

The content of the zinc powder is 40 to 70% by weight based on the total weight of solids of the rustproof coating composition.

When the content of the zinc powder is in the above range, there is an advantageous effect in rust resistance, adhesion, precipitation problems and the like. Specifically, when the content of the zinc powder is less than 40% by weight based on the total weight of solids of the anti-corrosive coating composition, the rust resistance is decreased, and when the content of the zinc powder is greater than 70% by weight, the overcoat adhesion decreases due to the increase in the zinc salt. Sedimentation problems may occur.

Since the aluminum tripolyphosphate is included in the antirust coating composition, there is an effect of greatly improving the rust resistance of the coating film together with the zinc powder.

The content of the aluminum tripolyphosphate is 2 to 12% by weight based on the total weight of the rustproof coating composition.

When the content of the aluminum tripolyphosphate is in the above range, it may exhibit excellent rust resistance even in a low coating film of 5 to 30 μm, specifically 8 to 10 μm.

P ₂ O ₅ of the aluminum tripolyphosphate The content is 30 to 90% by weight. Specifically, P ₂ O ₅ of the aluminum tripolyphosphate The content may be 45 to 80 wt% or 50 to 70 wt%, but is not limited thereto.

Al ₂ O ₃ of the aluminum tripolyphosphate The content is 10 to 40% by weight. Specifically, Al ₂ O ₃ of the aluminum tripolyphosphate The content may be 15 to 30% by weight or 15 to 20% by weight, but is not limited thereto.

The specific gravity of the aluminum tripolyphosphate is 2.5 to 3.5. Specifically, the specific gravity of the aluminum tripolyphosphate may be 2.8 to 3.2 or 2.9 to 3.1, but is not limited thereto.

The oil absorption of the aluminum tripolyphosphate is 10 to 70 ml / 100 g. Specifically, the oil absorption of the aluminum tripolyphosphate may be 35 to 60 ml / 100g or 40 to 50 ml / 100g, but is not limited thereto.

The second liquid may further include a extender pigment.

The extender pigment aims at maintaining the thickness of the coating film and enhancing mechanical properties, and has an effect of improving physical properties such as hardness of the coating film and adjusting rheology.

The extender pigment is not particularly limited, and pigments generally used in coating compositions can be used. Specifically, at least one selected from the group consisting of calcium carbonate, clay, talc, silica, mica, barium sulfate, potassium feldspar, soda feldspar, calcium feldspar, dolomite, zirconium silicate, zinc oxide, kaolin, wollastonite and diatomaceous earth, It is not limited to this.

The content of the extender pigment may be 0.2 to 15% by weight based on the total weight of the rust-preventive coating composition, but is not limited thereto.

When the content of the extender pigment is in the above range, there is an advantageous effect in forming an appropriate coating film and maintaining hardness.

In addition, the second liquid may further include a coloring pigment.

The said colored pigment aims at giving the color required to the antirust film formed.

The said colored pigment is not specifically limited, The pigment generally used widely for coating composition can be used. Specifically, at least one selected from the group consisting of titanium oxide, bengal, iron oxide, carbon black, copper-chromium black pigment, phthalocyanine green, phthalocyanine blue, cobalt blue, organic synthetic pigments and organic-inorganic synthetic pigments, but is not limited thereto. It doesn't happen.

The second liquid may further include zinc oxide or zinc phosphate.

Since the zinc oxide or zinc phosphate is included in the anticorrosive coating composition, the zinc powder and the aluminum tripolyphosphate are assisted together to improve the rust resistance of the coating film.

The median diameter (D50) of the zinc oxide or zinc phosphate is 1 μm to 20 μm. Specifically, the median diameter (D50) of zinc oxide or zinc phosphate may be 1 μm to 10 μm or 1 μm to 5 μm, but is not limited thereto.

The density of the zinc oxide or zinc phosphate is 3.0 to 6.0. Specifically, the density of the zinc oxide or zinc phosphate may be 5.3 to 5.9 or 3.0 to 3.6, but is not limited thereto.

The water content of the zinc oxide or zinc phosphate is 0.01 to 3.0% by weight. Specifically, the water content of zinc oxide or zinc phosphate may be 0.01 to 0.3 wt% or 1.0 to 3.0 wt%, but is not limited thereto.

The content of the zinc oxide and zinc phosphate is 1 to 5% by weight based on the total weight of the rustproof coating composition.

When the content of the zinc oxide and zinc phosphate is in the above range, there is a synergistic effect of further improving the rust resistance with the main rust preventive pigment.

The second liquid may further include an additive.

The additives may be those conventionally used in paint compositions as materials used to improve or maintain the performance of paints or coatings.

For example, the additives include thickeners, antisettling agents, desiccants, fluidity regulators, antifoaming agents, dispersants, color separation agents, anti-skinning agents, anti-sagging agents, plasticizers, ultraviolet absorbents, and the like. The said additive may be used individually by 1 type, and may be used in mixture of 2 or more type.

The anti-settling agent may be organic bentonite, polyethylene oxide, fumed silica, amide, etc., but is not limited thereto.

The dispersant may be a polyurethane, polyacrylic, Controlled Polymerization Technology (CPT), fatty acid, phosphate ester, etc., but is not limited thereto.

The drying agent may be silica gel, aluminum oxide, zeolite, etc., but is not limited thereto.

The ultraviolet absorbent may be benzophenone-based, benzotriazole-based, salicylic acid-based, acrylonitrile-based, organic nickel compound, monobenzoic acid-based, etc., but is not limited thereto.

The second liquid may further include a second solvent.

The second solvent is included in the anti-corrosive coating composition, and serves to improve wettability and workability, and stabilizes physical properties of the paint and helps dispersing pigments and the like.

Although the second solvent is not particularly limited, specifically, solvents commonly used in the paint field such as water, alcohol solvents, ester solvents, ketone solvents, aromatic solvents, glycol solvents, and the like may be used.

Description of the alcohol solvent, ester solvent, ketone solvent, aromatic solvent, glycol solvent, and the like is as described above.

The said 2nd solvent may be used individually by 1 type, or may mix and use 2 or more types.

The second solvent may be the same as or different from the first solvent.

The content of the first solvent and the second solvent is 20 to 60% by weight based on the total weight of the rustproof coating composition. Specifically, the content of the first solvent and the second solvent may be 30 to 50% by weight or 40 to 50% by weight based on the total weight of the rust-preventive coating composition, but is not limited thereto.

According to one embodiment, the second liquid is a extender pigment; Zinc oxide or zinc phosphate; additive; And a second solvent.

The viscosity of the first liquid Flow cup As measured by method (ASTM D5125), it is 8 to 16 seconds at 25 ° C. Specifically, the viscosity of the first liquid may be 9 to 11 seconds or 12 to 14 seconds at 25 ° C, but is not limited thereto.

The viscosity of the second liquid is 70-100 KU at 25 ° C. Specifically, the viscosity of the second liquid may be 75 to 85 KU or 85 to 95 KU at 25 ° C., but is not limited thereto.

When the viscosity of the first liquid and the second liquid is in the above range, it is possible to form a coating film with a small amount of diluent solvent, thereby reducing the VOC.

The volume ratio of the first liquid and the second liquid is 65:35 to 50:50. Specifically, the volume ratio of the first liquid and the second liquid may be 60:40 to 50:50 or 55:45 to 50:50, but is not limited thereto.

When the volume ratio of the first liquid and the second liquid is in the above range, there is an advantageous effect on the adhesion to the steel material and the rust prevention property.

The antirust coating composition is characterized in that it does not contain a powder comprising Li ₂ O, Na ₂ O and K ₂ O. When the anti-corrosive coating composition includes a powder containing Li ₂ O, Na ₂ O, and K ₂ O, there is a problem in that pinholes are generated when the coating film is formed as a thin film, thereby causing deterioration in rust resistance.

When the rust rating of the rust-preventive coating composition is evaluated according to ASTM D610 evaluation criteria, the rust rating of the rust-preventive coating composition may be 5 or more. Specifically, the rust rating of the antirust coating composition may be 5 to 10, 6 to 10, 7 to 10 or 8 to 10, but is not limited thereto.

When the rust rating of the rust-preventive coating composition satisfies the above range, the rust-preventing area is 3% or less of the total area, indicating that the rust-preventing property is relatively good.

Since the said rustproof coating composition does not contain an epoxy resin etc., it corresponds to the inorganic rustproof coating composition different from the organic rustproof coating composition normally used.

Various properties of the above-described antirust coating composition and components of the antirust coating composition may be combined.

The present invention provides an antirust film formed from the antirust coating composition described above.

The antirust film is coated with the antirust coating composition; Curing the painted coating composition to form an antirust coating film; And so on.

In the coating step, the antirust coating composition is coated on a surface of a substrate such as a steel sheet by a conventionally known method such as air spray or airless spray to form an uncured coating film. Generally as a coating machine, when painting a paint in a shipyard, a steel mill, etc., an airless spray and a line coating machine are mainly used. The line sprayer manages the film thickness according to the line speed, the coating pressure of the air spray, the airless spray, etc. installed inside the sprayer, and the conditions for promoting the size (diameter) of the spray tip.

In the curing step, the curing temperature (drying temperature) is usually 5 to 40C, preferably 10 to 30C, and the curing time (drying time) may be 3 to 15 minutes, specifically 5 to 10 minutes, but is not limited thereto. It is not.

It is preferable that the thickness of the dried rust preventive membrane is 5-15 micrometers. Specifically, the thickness of the rust preventive film is 6 to 15 μm, 6 to 12 μm, 6 to 10 μm, 7 to 15 μm, 7 to 12 μm, 7 to 10 μm, 8 to 15 μm, 8 to 12 μm, 8 to 8 It is preferable that it is 10 micrometers or 8-9.5 micrometers.

When the thickness of the rustproof film is in the above range, VOC generation is reduced by about 10 to 50% compared to the general rustproof paint, which is environmentally friendly. Specifically, if it is less than the above range, it is difficult to form a uniform coating film and the rust resistance is low. If it exceeds the above range, the amount of paint is increased, which is uneconomical, and the drying and crack resistance of the coating film is inferior.

The anti-rust film is formed by using the anti-corrosive coating composition in which the first liquid and the second liquid having the composition as described above are mixed, and thus the thickness of the dry film thickness (DFT) is about 5 to 10 because of excellent density and adhesion of the anti-rust film. Even if it is formed in the micrometer not only exhibits excellent rust resistance but also has excellent performance in weldability due to the reduction of the thickness of the coating film.

The above content is described in more detail by the following examples. However, the following examples are only for illustrating the present invention, and the scope of the examples is not limited thereto.

[ Production Example ] Example  1 to 26 and Comparative example  1 to 5: antirust coating composition

Tetraethoxysilicate as the alkyl silicate resin and alcohol solvent, glycol solvent and water as the first solvent were mixed, and then a small amount of an acid catalyst and zinc chloride were added thereto, followed by stirring for 90 minutes to prepare a first solution.

As a zinc powder, a spherical zinc powder, aluminum tripolyphosphate, zinc oxide, a sieving pigment, an additive, and an aromatic, alcoholic and glycolic solvent as a second solvent were mixed, and dispersed and stirred for 120 minutes to prepare a second liquid.

The weights of the alkyl silicate resins, first solvent, zinc powder, aluminum tripolyphosphate, zinc oxide, extender pigments, additives, and second solvents used in Examples 1 to 26 and Comparative Examples 1 to 5 are shown in Tables 1 to 4 below. As described.

[ Evaluation example ]

Evaluation example  1: average coating thickness

The average dry film thickness was measured using an Elcometer 456 instrument, and the average thickness of the coating film coated on the tin-plate (plate for measuring film thickness) was measured 10 times and the average value thereof was calculated as the average coating film thickness.

Evaluation example  2 : Antirust  evaluation

In order to measure the rust resistance of the dried coating film, after performing a salt spray test for 30 days according to ASTM B117, the degree of rust occurrence was measured and the degree of rust occurrence was evaluated according to the ASTM D610 evaluation criteria described below. It was.

<Evaluation Criteria ASTM D610>

10: No callout or callout area is less than 0.01% of the total area of the trial

9: area of rust exceeding 0.01% of the total area of the trial plate

8: area of rust exceeded 0.03% and not more than 0.1% of the total area of the trial

7: The area of call out exceeded 0.1% and less than 0.3% of the total area of the test plate

6: area of rust more than 0.3% and less than 1% of total area of trial

5: rust area is more than 1% and less than 3%

4: area of rust more than 3% and less than 10% of total area of trial

3: area of rust more than 10% and less than 16% of total area of trial

2: area of rust more than 16% and less than 33% of total area of trial

1: area of rust exceeding 33% and not more than 50% of the total area of the trial

0: Called area from more than 50% to 100% of the total area of the trial

Evaluation example  3: weldability evaluation

300 mm x 100 mm x 15T (two pieces) steel specimens were prepared, and the shot blasting was performed at a degree of roughness of Sa2 ½ or more and a roughness of 30 to 75 µm. Tin-plates (plates for measuring film thickness) were prepared and coated together on both sides of the specimen. In the case of the specimens, due to roughness, it is impossible to accurately measure the thickness of the coating film, and the thickness of the coating film coated on the tin-plate was measured ten times, and the average value was defined as the thickness of the coating film. After the natural drying for 7 days after coating, the two coated specimens were overlapped and welded in half so as to overlap each other so that the 300 mm surface could be welded. The welding site was broken and the porosity (%) was measured according to the following formula. At this time, when the porosity is 5% or less, it is represented by O, and when it is more than 5%, it is represented by X.

Porosity (%) = total pore area (mm ² ) / total welding area (mm ² )

Evaluation example  4: Zinc salt evaluation

After forming a uniform anti-corrosion film by air spray or airless spray, 1 ml of water was dropped on the rust preventive film daily from 1 day to 7 days, and then zinc salt was confirmed. In this case, when a small amount of zinc salt occurs, it is represented by O, and when an excessive amount of zinc salt occurs, it is represented by X.

Evaluation example  5: sediment evaluation during storage

0.8L of the second liquid was placed in a container and placed in a 40-degree constant temperature chamber after being sealed to evaluate precipitation after 1 month. It was judged whether the precipitate was softcake or hardcake. If the deposit is hard, it cannot be used during painting.

Softcake: Looses well when the sediment is stirred with a stick.

Hardcake: Does not loosen when the sediment is stirred with a stick.

At this time, the precipitate is represented by O when the softcake, X is shown when the hardcake.

Thread 1 Thread 2 Thread 3 Thread 4 Thread 5 Thread 6 Seal 7 Seal 8 First amount Alkyl silicate resin 10.6 10.4 10.1 9.9 9.6 9.4 9.1 9.4 Primary solvent 27.3 26.7 26.2 25.5 24.9 24.2 23.5 24.2 Second amount Zinc powder 19.2 22.1 25.1 28.3 31.6 35.0 38.7 35.0 Al tripolyphospate 6.0 6.0 6.0 6.0 6.0 6.0 6.0 2.0 zinc oxide - - - - - - - - Sieving pigment 14.8 13.1 11.4 9.6 7.8 5.8 3.7 9.8 additive 1.6 1.6 1.6 1.5 1.5 1.4 1.4 1.4 Second solvent 20.5 20.1 19.6 19.2 18.7 18.2 17.6 18.2 Total (by weight) 100 100 100 100 100 100 100 100

Seal 9 10 Seal 11 Seal 12 Seal 13 Seal 14 Seal 15 Thread 16 First amount Alkyl silicate resin 9.4 9.4 9.4 9.4 9.4 9.4 9.4 9.4 Primary solvent 24.2 24.2 24.2 24.2 24.2 24.2 24.2 24.2 Second amount Zinc powder 35.0 35.0 35.0 35.0 35.0 35.0 35.0 35.0 Al tripolyphospate 4.0 6.0 8.0 10.0 11.5 2.0 2.0 2.0 zinc oxide - - - - - 1.3 2.5 3.8 Sieving pigment 7.8 5.8 3.8 1.8 0.3 8.6 7.3 6.1 additive 1.4 1.4 1.4 1.4 1.4 1.4 1.4 1.4 Second solvent 18.2 18.2 18.2 18.2 18.2 18.2 18.2 18.2 Total (by weight) 100 100 100 100 100 100 100 100

Seal 17 Seal 18 Seal 19 Seal 20 Seal 21 Thread 22 Seal 23 Seal 24 First amount Alkyl silicate resin 9.4 9.4 9.4 9.4 9.4 9.4 9.4 9.4 Primary solvent 24.2 24.2 24.2 24.2 24.2 24.2 24.2 24.2 Second amount Zinc powder 35.0 35.0 35.0 35.0 35.0 35.0 35.0 35.0 Al tripolyphospate 2.0 4.0 4.0 4.0 4.0 4.0 6.0 6.0 zinc oxide 5.0 - 1.3 2.5 3.8 5.0 - 1.3 Sieving pigment 4.8 7.8 6.6 5.3 4.1 2.8 5.8 4.6 additive 1.4 1.4 1.4 1.4 1.4 1.4 1.4 1.4 Second solvent 18.2 18.2 18.2 18.2 18.2 18.2 18.2 18.2 Total (by weight) 100 100 100 100 100 100 100 100

Seal 25 Seal 26 Rain 1 B2 Rain 3 Rain 4 Rain 5 First amount Alkyl silicate resin 9.4 9.4 10.8 10.7 8.8 8.7 9.4 Primary solvent 24.2 24.2 27.9 27.6 22.7 22.3 24.2 Second amount Zinc powder 35.0 35.0 16.5 17.8 42.5 44.5 35.0 Al tripolyphospate 6.0 6.0 6.0 6.0 6.0 6.0 - zinc oxide 2.5 3.8 - - - - - Sieving pigment 3.3 2.1 16.3 15.6 1.5 0.4 11.8 additive 1.4 1.4 1.7 1.7 1.4 1.3 1.4 Second solvent 18.2 18.2 20.9 20.7 17.1 16.8 18.2 Total (by weight) 100 100 100 100 100 100 100

Examples 1 to 26 showed excellent results in the evaluation of rust resistance, weldability, zinc salt and precipitation during storage, whereas Comparative Examples 1, 2 and 5 showed significantly lower results in rust resistance evaluation, and Comparative Examples 3 and 4 showed weldability. , Zinc salt and precipitation during storage showed lower results.

Claims (15)

An antirust coating composition comprising a first liquid and a second liquid,
The first liquid comprises an alkyl silicate resin,
The second liquid comprises zinc powder and aluminum tripolyphosphate,
The content of the zinc powder is 18 to 40% by weight based on the total weight of the rustproof coating composition, rustproof coating composition.
The method of claim 1,
The content of the aluminum tripolyphosphate is 2 to 12% by weight based on the total weight of the rustproof coating composition, rustproof coating composition.
The method of claim 1,
The anti-corrosive coating composition wherein the second liquid further contains a extender pigment.
The method of claim 3,
The content of the extender pigment is 0.2 to 15% by weight based on the total weight of the rust-preventive coating composition, rust-preventive coating composition.
The method of claim 1,
The second anti-corrosive coating composition further comprises zinc oxide or zinc phosphate.
The method of claim 5,
The content of the zinc oxide and zinc phosphate is 1 to 5% by weight, based on the total weight of the rust-preventive coating composition.
The method of claim 1,
The content of the zinc powder is 40 to 70% by weight based on the total weight of solids of the rustproof coating composition, rustproof coating composition.
The method of claim 1,
The alkyl silicate resin is tetramethoxysilicate, tetraethoxysilicate, tetrapropoxysilicate, tetraisopropoxysilicate, tetrabutoxysilicate, tetramethylorthosilicate, tetraethylorthosilicate, tetra-n-propylortho An anti-corrosive coating composition comprising at least one selected from the group consisting of silicates, tetraisopropyl orthosilicates, tetra-n-butyl orthosilicates, tetra-sec-butyl orthosilicates, methyl polysilicates and ethyl polysilicates.
The method of claim 1,
The anti-corrosive coating composition of specific gravity of the said alkyl silicate resin is 0.9-1.1.
The method of claim 1,
The antirust coating composition whose average particle diameter of the said zinc powder is 1-20 micrometers.
The method of claim 1,
The anti-corrosive coating composition wherein the first liquid further comprises a first solvent.
The method of claim 1,
The second liquid is a extender pigment; Zinc oxide or zinc phosphate; additive; And a second solvent.
The method of claim 1,
The volume ratio of the said 1st liquid and said 2nd liquid is 65: 35-50: 50, The antirust coating composition.
An antirust film formed from the antirust coating composition of claim 1.
The method of claim 14,
The antirust film whose thickness is 5-15 micrometers.