CN115029037A - Water-based anticorrosive paint and preparation method and application thereof - Google Patents

Abstract

The application relates to the technical field of anticorrosive coatings, and particularly discloses a water-based anticorrosive coating and a preparation method and application thereof. The water-based anticorrosive paint comprises the following components in parts by weight: 45-70 parts of acrylic emulsion, 1-4 parts of chelating agent and 15-25 parts of tannic acid solution; further, the water-based anticorrosive paint can also comprise the following components in parts by weight: 53-65 parts of acrylic emulsion, 2-3 parts of chelating agent and 18-23 parts of tannic acid solution; wherein the chelating agent is a mixture of citric acid, glycolic acid and disodium ethylenediamine tetraacetate; the preparation method of the water-based anticorrosive paint and the application of the water-based anticorrosive paint in steel metal members. The water-based anticorrosive paint provided by the application can effectively remove rust on the surface of rusted steel and improve the corrosion resistance of the steel.

Description

Water-based anticorrosive paint and preparation method and application thereof

Technical Field

The application relates to the technical field of anticorrosive coatings, in particular to a water-based anticorrosive coating and a preparation method and application thereof.

Background

According to statistics, steel with nearly one tenth of the total output is corroded every year in the world, and if corrosion-resistant treatment is not carried out on the corroded steel material in time, the appearance, color, smoothness, mechanical property and the like of the steel material are seriously affected. At present, the main method for inhibiting the corrosion of the steel is to coat an anticorrosive coating on the surface of the steel, form a layer of protective film on the surface of the steel by utilizing the effects of corrosion inhibition, passivation and the like of the anticorrosive coating, and prevent external moisture, oxygen and the like from contacting with the metal surface. However, before the surface of steel is coated with the anticorrosive paint, the original rust on the surface of steel is often required to be removed, and the current rust removing methods mainly comprise the following steps: manual rust removal, sand blasting rust removal and chemical reagent rust removal.

Although the rust removing method can remove the rust, the method still has some defects: firstly, the manual rust removal method is adopted, so that the workload of rust removal is large, the time consumption is long, and the problem of incomplete rust removal can also exist; secondly, the sand blasting method is adopted, so that the rust removal cost is high, the caused noise and pollution are serious, even the thickness of the steel material is reduced, and the mechanical property of the steel material is adversely affected; thirdly, rust removal is carried out by utilizing a chemical reagent, the method needs to soak rusted steel in chemical liquid, and the rust on the surface of the steel is removed by utilizing the space between the rust and the chemical reagent, but the method is only suitable for small steel materials, so the application range is very limited.

Therefore, there is an urgent need to provide a new way to remove rust from the surface of steel and to improve the corrosion resistance of steel.

Disclosure of Invention

The application provides a water-based anticorrosive paint and a preparation method and application thereof in order to remove rust on the surface of steel and improve the anticorrosive property of the steel.

In a first aspect, the application provides a water-based anticorrosive paint, which adopts the following technical scheme:

the water-based anticorrosive paint comprises the following components in parts by weight: 45-70 parts of acrylic emulsion, 1-4 parts of chelating agent and 15-25 parts of tannic acid solution.

The water-based anticorrosive coating is prepared from the acrylic emulsion, the chelating agent and the tannic acid solution, and is coated on the surface of a steel product containing iron rust, because the main component of the iron rust is ferric oxide, the iron rust can be converted into iron ions under an acidic condition and is uniformly dispersed in the water-based anticorrosive coating, and the conversion and transfer of the iron rust on the surface of the steel product are realized; the iron ions transferred into the water-based anticorrosive paint can be further converted into a part of the water-based anticorrosive paint, and the part of the water-based anticorrosive paint and the water-based anticorrosive paint are attached to the surface of a steel product, so that the compactness and the water resistance of the water-based anticorrosive paint after film forming are effectively improved, and the corrosion resistance of the surface of the base material is further enhanced.

The addition of the chelating agent can ensure the acid stability of the water-based anticorrosive paint, and can increase the solubility and thermal stability of iron ions in the water-based anticorrosive paint, thereby improving the rust transfer capacity and anticorrosive performance of the paint. The chelating agent can form a chelate ring by chelation with iron ions in iron rust, and a compound containing the chelate ring is referred to as a chelate compound, so that the structure of the chelate compound is stable, and the stability of the chelate compound is improved as the number of chelate rings around iron ions increases. In addition, the chelating agent also has good dispersing performance and can uniformly disperse ferric oxide ions in the water-based anticorrosive paint.

Tannic acid is a polyhydroxy compound, hydroxyl on the surface of the tannic acid can be complexed with iron ions to form a ferric tannate complex, and the ferric tannate complex has a five-membered net structure, so that the tannic acid complex has good compactness and adhesion, can enable the water-based anticorrosive paint to be fully adhered to the surface of a steel product and tightly combined with a steel matrix, and isolates the surface of the steel from the external environment (such as O) ₂ 、H ₂ O、Cl ^- ) The contact of the components can further play a good role in rust prevention and corrosion prevention.

In the present application, the preparation method of the tannic acid solution is: adding the tannic acid powder into deionized water, uniformly stirring, and preparing into a tannic acid solution with the mass concentration of 10%.

Further, the water-based anticorrosive paint comprises the following components in parts by weight: 53-65 parts of acrylic emulsion, 2-3 parts of chelating agent and 18-23 parts of tannic acid solution.

In a particular embodiment, the acrylic emulsion may be 45 parts, 53 parts, 60 parts, 65 parts, or 70 parts by weight.

In some particular embodiments, the acrylic emulsion may also be present in an amount of 45-53 parts, 45-60 parts, 45-65 parts, 53-60 parts, 53-65 parts, 53-70 parts, 60-65 parts, 60-70 parts, or 65-70 parts by weight.

In a particular embodiment, the chelating agent may be present in 1 part, 2 parts, 2.5 parts, 3 parts, or 4 parts by weight.

In some specific embodiments, the chelating agent may also be present in an amount of 1 to 2 parts, 1 to 2.5 parts, 1 to 3 parts, 2 to 2.5 parts, 2 to 3 parts, 2 to 4 parts, 2.5 to 3 parts, 2.5 to 4 parts, or 3 to 4 parts by weight.

In a particular embodiment, the tannic acid solution can be 15 parts, 18 parts, 20 parts, 23 parts, or 25 parts by weight.

In some specific embodiments, the tannic acid solution can also be 15-18 parts, 15-20 parts, 15-23 parts, 18-20 parts, 18-23 parts, 18-25 parts, 20-23 parts, 20-25 parts, or 23-25 parts by weight.

According to the water-based anticorrosive coating, the weight parts of the acrylic emulsion, the chelating agent and the tannic acid solution in the water-based anticorrosive coating are controlled within the above range, so that the rust transfer capacity and the corrosion resistance of the water-based anticorrosive coating can be improved, and the water-based anticorrosive coating with excellent rust transfer capacity and corrosion resistance can be obtained.

Further, the chelating agent is selected from citric acid, ammonium citrate, glycolic acid and disodium ethylenediaminetetraacetate.

Preferably, the chelating agent is a mixture of citric acid, glycolic acid and disodium ethylenediaminetetraacetate.

The chelating agent provided by the application is prepared by compounding citric acid, glycolic acid and ethylene diamine tetraacetic acid disodium salt. Glycolic acid is capable of reacting with rust to dissolve the rust, but its effect is not significant when the rust content is large. The citric acid can convert iron rust into ferrous ions, and the ferrous ions can generate chelation with disodium ethylene diamine tetraacetate to generate disodium iron ethylenediamine tetraacetate, so that the disodium iron ethylenediamine tetraacetate is stably dispersed in the water-based anticorrosive coating, thereby not only realizing the transfer of the iron rust on the surface of steel, but also playing a good role in protecting the surface of a steel iron substrate.

Citric acid is a tricarboxylic acid compound, and under the weak acid condition, the citric acid can be combined with iron ions to form a soluble complex, so that the iron ions are transferred to the water-based anticorrosive coating from the surface of the steel, and the corrosion resistance of the steel is further improved. Under the acidic condition, the citric acid has strong reducibility, so that the ferric ions can be reduced into ferrous ions, and the ferrous ions can be dissolved in water and further can be uniformly dispersed in the water-based anticorrosive paint to be used as a part of the water-based anticorrosive paint, thereby realizing the protection effect on the surface of the steel product.

Glycolic acid is an organic acid that is highly acidic but has little corrosive capacity. The glycolic acid can react with the iron rust, and the iron rust is removed under the condition of not damaging the steel base material; the disodium ethylenediaminetetraacetate has six coordination atoms, can chelate ferrous ions in a system to form disodium ferric ethylenediaminetetraacetate, has good stability, and can be dissolved in a water solution.

Further, the weight ratio of the citric acid to the glycolic acid to the disodium ethylenediaminetetraacetate is 1: (0.5-0.9): (0.3-0.7).

In a particular embodiment, the weight ratio of the citric acid, the glycolic acid, and the disodium salt of ethylenediaminetetraacetic acid may be 1: 0.5: 0.5, 1: 0.7: 0.5, 1: 0.9: 0.5, 1: 0.5: 0.3 or 1: 0.5: 0.7.

in some specific embodiments, the weight ratio of the citric acid, the glycolic acid, and the disodium salt of ethylenediaminetetraacetic acid may also be 1: (0.5-0.7): 0.5, 1: (0.7-0.9): 0.5, 1: 0.7: (0.3-0.5) or 1: 0.7: (0.5-0.7).

According to the application, the weight ratio of citric acid to glycolic acid to ethylenediaminetetraacetic acid disodium salt in the chelating agent is controlled within the range, iron rust on the surface of steel can be converted and transferred into the water-based anticorrosive coating through the synergistic effect of the components, and the iron rust on the surface of steel can be effectively removed. In addition, the rust transferred into the water-based anticorrosive paint can become a part of the water-based anticorrosive paint, so that the surface of the water-based anticorrosive paint after film formation is more compact, the film thickness and the waterproof performance are improved, and the water-proof and anti-oxidation protection effects on the steel substrate are good.

Further, the water-based anticorrosive paint also comprises a film forming additive; the film forming aid is selected from propylene glycol, hexylene glycol, dodecyl alcohol ester, dipropylene glycol methyl ether and dipropylene glycol butyl ether.

Preferably, the film-forming aid is a mixture of hexanediol and dipropylene glycol methyl ether; the weight ratio of the hexanediol to the dipropylene glycol methyl ether is 1: (0.35-0.55).

In a specific embodiment, the weight ratio of the hexylene glycol and the dipropylene glycol methyl ether is 1: 0.35, 1: 0.45 or 1: 0.55.

in some specific embodiments, the weight ratio of the hexylene glycol and the dipropylene glycol methyl ether is 1: (0.35-0.45) or 1: (0.45-0.55).

The water-based anticorrosive paint provided by the application adopts the mixture of hexanediol and dipropylene glycol methyl ether, and the weight ratio of hexanediol to dipropylene glycol methyl ether is controlled within the range, so that the anticorrosive performance of the water-based anticorrosive paint can be further improved, the water resistance of the water-based anticorrosive paint is improved to 223h and the salt spray resistance of 5% neutral brine is improved to 964 h and 968 h.

Further, the water-based anticorrosive paint also comprises hydroxyethyl cellulose, an ultraviolet absorber, a light stabilizer, a thickening agent, a defoaming agent, a wetting and leveling agent, an antifreezing agent and a mildew preventive.

In a second aspect, the present application provides a method for preparing a water-based anticorrosive paint.

A preparation method of a water-based anticorrosive paint specifically comprises the following steps:

(1) firstly, sequentially adding the hydroxyethyl cellulose, the solvent, the chelating agent and the acrylic emulsion into a stirring device to obtain a mixture I;

(2) then uniformly mixing the ultraviolet absorbent and the light stabilizer to obtain a mixture II;

(3) and under the stirring state, sequentially adding the tannic acid solution, the mixture II and the thickening agent into the mixture I, and uniformly stirring to obtain the water-based anticorrosive paint.

The water-based anticorrosive coating prepared by the steps has the advantages of strong rust transfer capability, good anticorrosive performance and proper viscosity.

In a third aspect, the application provides the application of the water-based anticorrosive paint in steel metal members.

The application provides a waterborne anticorrosive coating can be used to rusty steel member surface, can shift the iron rust on steel member surface to in the waterborne anticorrosive coating to partly among the waterborne anticorrosive coating, both got rid of the iron rust on steel member surface, can completely cut off contact such as steel member surface and moisture, oxygen again, and then demonstrate excellent anticorrosive function.

In summary, the present application has the following beneficial effects:

(1) the application provides a water-based anticorrosive coating, which has water resistance of 168-223h and salt spray resistance of 840-968h, and is coated on a rusted steel surface, so that rust on the surface of a corroded metal can be converted and transferred into the water-based anticorrosive coating, the rust on the steel surface can be removed, and a protective film can be formed on the steel surface by the water-based anticorrosive coating, so that the steel is prevented from contacting with the external environment, and the corrosion resistance of the steel is effectively improved.

(2) The water-based anticorrosive paint further controls the weight parts of the components in the following ranges: 53-65 parts of acrylic emulsion, 2-3 parts of chelating agent and 18-23 parts of tannic acid solution, and the water resistance of the obtained water-based anticorrosive paint is more than 190h and the salt spray resistance is more than 910 h.

(3) The chelating agent in the application adopts a mixture of citric acid, glycolic acid and disodium ethylenediamine tetraacetic acid, and further controls the weight ratio of the citric acid to the glycolic acid to the disodium ethylenediamine tetraacetic acid to be 1: (0.5-0.9): (0.3-0.7), the water resistance of the obtained water-based anticorrosive paint is more than 200h, the salt spray resistance is more than 940h, and the anticorrosive performance is better.

(4) The preferred film forming aid is a mixture of hexanediol and dipropylene glycol methyl ether, and the weight ratio of hexanediol to dipropylene glycol methyl ether is controlled to be 1: within the range of (0.35-0.55), the obtained water-based anticorrosive coating has better anticorrosive performance, the water resistance is up to 218-223h, and the salt spray resistance is up to 964-968 h.

Detailed Description

The application provides a water-based anticorrosive paint which comprises the following components in parts by weight: 45-70 parts of acrylic emulsion, 1-4 parts of chelating agent and 15-25 parts of tannic acid solution; further, the water-based anticorrosive paint can also comprise the following components in parts by weight: 53-65 parts of acrylic emulsion, 2-3 parts of chelating agent and 18-23 parts of tannic acid solution; further, the water-based anticorrosive paint also comprises a film-forming assistant, hydroxyethyl cellulose, an ultraviolet absorbent, a light stabilizer, a thickening agent and a solvent; the film forming aid is selected from propylene glycol, hexylene glycol, lauryl alcohol ester, dipropylene glycol methyl ether and dipropylene glycol butyl ether.

Wherein the chelating agent is a mixture of citric acid, glycolic acid and disodium ethylenediamine tetraacetate; still further, the weight ratio of the citric acid to the glycolic acid to the disodium edetate is 1: (0.5-0.9): (0.3-0.7).

The preparation method of the water-based anticorrosive paint specifically comprises the following steps:

(1) firstly, 0.1 to 0.3g of hydroxyethyl cellulose and 10 to 13g of deionized water are added into a stirring tank and stirred for 5 to 30min at the rotating speed of 500-550 r/min; then 0.2-0.3g of defoaming agent, 0.2-0.4g of wetting and leveling agent, 2-3g of antifreezing agent, 3-4g of film-forming assistant, 1-4g of chelating agent and 0.1-0.2g of mildew preventive are sequentially added into the stirring tank, and the mixture is stirred for 5-10 min; and then adding 40-70g of acrylic emulsion into a stirring tank at the rotating speed of 300r/min, and stirring for 10-20min to obtain a mixture I.

(2) 0.4-0.6g of ultraviolet absorbent and 0.2-0.3g of light stabilizer are mixed and stirred uniformly to obtain a mixture II; (3) under the stirring state, sequentially adding 15-25g of the tannic acid solution, 0.3-0.5g of the mixture and 0.3-0.5g of the thickening agent into the mixture I, and uniformly stirring to obtain the water-based anticorrosive paint.

In the specific embodiment of the application, the defoaming agent is an organosilicon modified polysiloxane emulsion with a model of Digao TEGO Foamex 30; the wetting and leveling agent is polyether modified siloxane polymer with the model of Lencolo 3157; the antifreeze is glycol, and the CAS number is 107-21-1; the mildew preventive is a mixture of 5-chloro-2-methyl-1-isothiazoline-3-ketone and 2-methyl-1-isothiazoline-3-ketone, and the CAS number is 55965-84-9; the ultraviolet absorbent is 2- (5-tert-butyl-2-hydroxyphenyl) benzotriazole with CAS number of 3147-76-0; the light stabilizer is Tinuvin 123; the thickening agent is nonionic polyurethane with the model number of AH-1704-1; other raw materials, reagents, solvents, etc. are also commercially available.

The present application is described in further detail below with reference to examples and performance testing tests.

Examples

Examples 1 to 13

Examples 1-13 each provide an aqueous corrosion protective coating.

The above embodiments differ in that: the components and the addition amount of the water-based anticorrosive paint are specifically shown in table 1.

The preparation method of the water-based anticorrosive paint provided by the embodiment 3 comprises the following steps:

(1) firstly, 0.2g of hydroxyethyl cellulose and 10g of deionized water are added into a stirring tank and stirred for 1000min at the rotating speed of 500 r/min; then 0.25g of defoaming agent, 0.3g of wetting and leveling agent, 2.5g of antifreezing agent, 3.5g of film-forming additive, 2.5g of chelating agent and 0.2g of mildew preventive are added into the stirring tank in sequence and stirred for 5 min; then adding 60g of acrylic emulsion into a stirring tank at the rotating speed of 300r/min, and stirring for 15min to obtain a mixture I;

wherein the film-forming additive is 2,2, 4-trimethyl-1, 3-pentanediol monoisobutyrate; the chelating agent is a mixture of citric acid, glycolic acid and disodium ethylenediamine tetraacetic acid; the weight ratio of the citric acid to the glycolic acid to the disodium edetate is 1: 0.7: 0.5.

(2) 0.5g of ultraviolet absorbent and 0.2g of light stabilizer are mixed and stirred uniformly to obtain a mixture II;

(3) under the stirring state, 20g of tannic acid solution, 0.7g of mixture and 0.4g of thickening agent are sequentially added into the mixture I, and the mixture is uniformly stirred to obtain the water-based anticorrosive paint.

TABLE 1 addition amounts of the components in the waterborne corrosion resistant coating provided in examples 1-13

Examples 14 to 22

Examples 14-22 each provide an aqueous corrosion protective coating.

The above embodiment is different from embodiment 3 in that: the amounts of the respective components of the chelating agent added to the aqueous anticorrosive coating are specifically shown in table 2.

Table 2 examples 3 and 14 to 22 provide aqueous anticorrosive coatings in which the chelating agent is added in an amount

Example 23

Example 23 provides a waterborne corrosion resistant coating.

The above embodiment is different from embodiment 3 in that: in the water-based anticorrosive paint, the film-forming assistant is propylene glycol.

Example 24

Example 24 provides a waterborne corrosion resistant coating.

The above embodiment is different from embodiment 3 in that: in the water-based anticorrosive paint, the film-forming assistant is dipropylene glycol methyl ether.

Examples 25 to 29

Examples 25-29 each provide an aqueous corrosion protective coating.

The above embodiment is different from embodiment 3 in that: the weight ratio of the film forming aid components in the aqueous anticorrosive paint is specifically shown in table 3.

TABLE 3 weight ratios of components in waterborne corrosion resistant coatings provided in examples 25-29

Example 30

Example 30 provides a waterborne corrosion resistant coating.

The above embodiment is different from embodiment 3 in that: in the water-based anticorrosive paint, the film-forming additive is a mixture of 2,2, 4-trimethyl-1, 3-pentanediol monoisobutyrate and dipropylene glycol methyl ether; the weight ratio of 2,2, 4-trimethyl-1, 3-pentanediol monoisobutyrate to dipropylene glycol methyl ether is 1: 0.45.

comparative example

Comparative example 1

Comparative example 1 provides an aqueous anticorrosive coating.

The above comparative example differs from example 3 in that: the aqueous anticorrosive coating provided in comparative example 1 was not added with a chelating agent.

Comparative example 2

Comparative example 2 provides a water-based anticorrosive coating.

The water-based anticorrosive paint is prepared from the following raw materials in parts by weight: 70g of aqueous PVDC emulsion, 15g of tannic acid solution, 7g of filler, 6g of corrosion inhibitor, 4g of film-forming aid, 0.4g of surfactant, 0.15g of rheological aid and 0.07g of preservative.

Performance test

The water-based anticorrosive coatings provided in examples 1-29 and comparative examples 1-2 were coated on rusty steel sample surfaces, the thickness of the coating film was 180-250 μm, and the water resistance and salt spray resistance of the steel sample surfaces were tested.

Reference is made to GB/T1722-1993 for testing water resistance; the test method of the salt fog resistance refers to GB/T1771-91.

The results of testing the water resistance and the salt spray resistance of the water-based anticorrosive coatings provided in examples 1 to 29 and comparative examples 1 to 2 are shown in Table 4.

TABLE 4 test results of the Properties of the aqueous anticorrosive coatings provided in examples 1 to 29 and comparative examples 1 to 2

According to the detection results in Table 4, the water resistance of the water-based anticorrosive coatings provided in examples 1-29 is 168-223h, and the salt spray resistance is 840-968 h; while comparative examples 1-2 provide aqueous anticorrosive coatings having water resistance of 138h and 147h, respectively, and salt spray resistance of 727h and 735h, respectively. Therefore, the aqueous anticorrosive coating which is strong in rust transfer capacity and excellent in corrosion resistance can be prepared by mixing the acrylic emulsion, the chelating agent, the tannic acid solution and other auxiliaries.

As can be seen from the results of the tests of comparative examples 1 to 5, the water resistance of the water-based anticorrosive paint tends to increase and then to be substantially unchanged, and the salt spray resistance tends to increase and then to decrease slightly as the amount of the acrylic emulsion added to the water-based anticorrosive paint increases. Further comparison shows that the comprehensive performance of the water resistance and the salt spray resistance of the water-based anticorrosive coatings provided in examples 2 to 4 is better than that of the water resistance and the salt spray resistance of the water-based anticorrosive coatings provided in examples 1 and 5, and the application shows that when the weight part of the acrylic emulsion in the water-based anticorrosive coating is controlled to be 53 to 65 parts, the obtained water-based anticorrosive coatings have better water resistance and salt spray resistance and better anticorrosive performance.

According to the detection results of the examples 3 and 6-9, the water resistance of the water-based anticorrosive coatings provided by the examples 3 and 7-8 is 189-216h, and the salt spray resistance is 925-960 h; the water resistance of the water-based anticorrosive paint provided by the embodiment 6 and the embodiment 9 is respectively 168h and 174h, and the salt spray resistance is respectively 840h and 911 h. Therefore, when the chelating agent is controlled to be 2-3 parts by weight, the obtained water-based anticorrosive coating has better water resistance and salt spray resistance and better anticorrosive performance.

From the results of examples 3 and 10 to 13, it is found that the water resistance and the salt spray resistance of the aqueous anticorrosive coating tend to increase and decrease with the increase in the weight part of the tannic acid solution. Furthermore, the water resistance of the water-based anticorrosive coatings obtained in examples 3 and 11-12 is 195-960 h, and the salt spray resistance is 931-960 h. The application can obtain the water-based anticorrosive paint with better anticorrosive performance when the weight part of the tannic acid solution is controlled within the range of 18-23 parts.

The detection results of comparative example 3 and examples 14 to 22 show that the water resistance and the salt fog resistance of the water-based anticorrosive paint obtained by compounding the three chelating agents of citric acid, glycolic acid and ethylenediaminetetraacetic acid disodium salt provided in examples 3 and 17 to 22 are obviously superior to the water resistance and the salt fog resistance of the water-based anticorrosive paint obtained by compounding any two chelating agents of citric acid, glycolic acid and ethylenediaminetetraacetic acid disodium salt provided in examples 14 to 16; and further comparison shows that the weight ratio of the citric acid to the glycolic acid to the ethylenediaminetetraacetic acid disodium salt is controlled to be 1: (0.5-0.9): (0.3-0.7), the water resistance of the obtained water-based anticorrosive coating is more than 200h, and the salt spray resistance is more than 940 h. Therefore, the application adopts citric acid, glycolic acid and ethylenediaminetetraacetic acid disodium salt for compounding, and the weight ratio of the citric acid, the glycolic acid and the ethylenediaminetetraacetic acid disodium salt is controlled to be 1: (0.5-0.9): (0.3-0.7), the water-based anticorrosive paint with better anticorrosive performance can be obtained.

The detection results of comparative example 3 and examples 23 to 30 show that the film-forming aid of the present application is a mixture of hexanediol and dipropylene glycol methyl ether, which can further improve the water resistance and salt spray resistance of the water-based anticorrosive coating; and the weight ratio of the hexanediol to the dipropylene glycol methyl ether is controlled to be 1: within the range of (0.35-0.55), the water resistance of the obtained water-based anticorrosive paint is up to 218-.

In summary, the water-based anticorrosive coating provided by the application controls the weight parts of the components in the following ranges: 53-65 parts of acrylic emulsion, 2-3 parts of chelating agent and 18-23 parts of tannic acid solution; the chelating agent is a mixture of citric acid, glycolic acid and disodium ethylenediamine tetraacetic acid, and the weight ratio of the citric acid to the glycolic acid to the disodium ethylenediamine tetraacetic acid is controlled to be 1: (0.5-0.9): (0.3-0.7); the film-forming aid is a mixture of hexanediol and dipropylene glycol methyl ether, and the weight ratio of hexanediol to dipropylene glycol methyl ether is controlled to be 1: (0.35-0.55), the water-based anticorrosive paint with excellent rust transfer capability and anticorrosive performance can be prepared, and the water resistance of the water-based anticorrosive paint is more than 190h, and the salt spray resistance of the water-based anticorrosive paint is more than 900 h. The surface of the stainless steel is coated by the water-based anticorrosive paint, so that the rust can be converted and transferred into the water-based anticorrosive paint through the interaction between the rust and the water-based anticorrosive paint under the condition of not removing the rust, the rust on the surface of the steel is removed, the steel is prevented from contacting with the external environment, and the possibility of rusting on the surface of the steel is reduced.

Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims (8)

1. The water-based anticorrosive paint is characterized by comprising the following components in parts by weight: 45-70 parts of acrylic emulsion, 1-4 parts of chelating agent and 15-25 parts of tannic acid solution.

2. The water-based anticorrosive paint according to claim 1, characterized in that the water-based anticorrosive paint comprises the following components in parts by weight: 53-65 parts of acrylic emulsion, 2-3 parts of chelating agent and 18-23 parts of tannic acid solution.

3. The aqueous corrosion protective coating of any one of claims 1-2 wherein the chelating agent is a mixture of citric acid, glycolic acid, and disodium ethylenediaminetetraacetate.

4. The aqueous anticorrosive paint according to claim 3, wherein the weight ratio of the citric acid to the glycolic acid to the disodium salt of ethylenediaminetetraacetic acid is 1: (0.5-0.9): (0.3-0.7).

5. The aqueous anticorrosive coating of claim 1, further comprising a film-forming aid; the film forming aid is selected from propylene glycol, hexylene glycol, lauryl alcohol ester, dipropylene glycol methyl ether and dipropylene glycol butyl ether.

6. The aqueous anticorrosive paint according to claim 5, wherein the film-forming assistant is a mixture of hexanediol and dipropylene glycol methyl ether; the weight ratio of the hexanediol to the dipropylene glycol methyl ether is 1: (0.35-0.55).

7. The method for preparing the aqueous anticorrosive paint according to any one of claims 1 to 6, characterized by comprising the steps of:

(1) firstly, sequentially adding the hydroxyethyl cellulose, the solvent, the chelating agent and the acrylic emulsion into a stirring device to obtain a mixture I;

(2) then uniformly mixing the ultraviolet absorbent and the light stabilizer to obtain a mixture II;

(3) and under the stirring state, sequentially adding the tannic acid solution, the mixture II and the thickening agent into the mixture I, and uniformly stirring to obtain the water-based anticorrosive paint.

8. Use of a water-borne corrosion protective coating according to any one of claims 1 to 6 in steel and iron metal components.