CN115975477A - Low-surface-treatment anticorrosive paint and preparation method thereof - Google Patents

Abstract

The invention provides a low surface treatment anticorrosive paint and a preparation method thereof, wherein the anticorrosive paint comprises a component A and a component B; wherein the component A comprises the following components in percentage by weight: 15% -25% of a water-based epoxy curing agent; 8% -18% of a rheological agent; 1% -2% of an auxiliary agent; 0.5 to 1.5 percent of flash rust inhibitor; 3% -6% of rust stabilizer; 30-45% of pigment and filler; water: the balance; the component B comprises the following components in percentage by weight: 65-80% of water-based epoxy resin; 8% -18% of epoxy reactive diluent; 6% -25% of a slow-release capsule body; 1% -3% of adhesion promoter; wherein, the sustained-release capsule body is prepared by adopting the following method: and dissolving benzotriazole in a solvent, adding a floatstone material, dispersing uniformly, and drying to obtain the sustained-release capsule. The low-surface-treatment anticorrosive paint provided by the invention can solve the problem that the surface treatment requirement of the substrate surface is higher when the water-based epoxy paint is used in the prior art.

Description

Low-surface-treatment anticorrosive paint and preparation method thereof

Technical Field

The invention relates to the technical field of chemical industry, in particular to a low-surface-treatment anticorrosive paint and a preparation method thereof.

Background

The water-based epoxy coating not only has the advantages of high adhesive force, high corrosion resistance and the like of the traditional solvent-based epoxy coating, but also takes water as a dispersion medium, does not contain volatile organic solvents or has low content of volatile organic compounds, is environment-friendly, and is widely applied to the field of coatings.

Generally, when the water-based epoxy paint is applied to the surface of a metal substrate, stricter surface treatment requirements and procedures are provided, for example, before the paint is coated, the surface of the metal substrate needs to be treated, so that the surface of the metal substrate meets the specified coating requirements, for example, when the water-based epoxy paint is coated on the surface of the metal substrate, the surface cleanliness of the surface of the metal substrate needs to reach Sa2.5 level, the surface roughness reaches 40-80 micrometers, the surface salt content is less than 50 mg/square meter, and only under the standard condition, the coating of the water-based epoxy paint can be well attached to the surface of the metal substrate, so that better anticorrosion and protection effects are exerted.

However, under certain specific conditions, the surface of the metal substrate has no condition or can not meet the requirement of surface treatment, for example, under maintenance conditions, the surface treatment of the metal substrate is difficult to meet the requirement basically, in some maintenance works of coating systems of industrial and marine engineering, water sand blasting or high-pressure water derusting is adopted for environmental protection, flash rust can be generated on the surface after the substrate treatment, and the surface treated under the maintenance conditions can not meet the optimal requirement of coating of the water-based epoxy paint. In addition, in a chemical storage tank area, due to the existence of flammable and explosive oil products and chemicals, local sand washing, grinding and the like are strictly prohibited on the surface of a chemical tank body, which may cause spark operation, and thus the surface of a metal substrate cannot be subjected to surface treatment to meet the coating requirement of the water-based epoxy coating. The use of waterborne epoxy coatings on such metal substrates with low surface treatment requirements is limited.

Disclosure of Invention

The invention aims to provide a low-surface-treatment anticorrosive paint and a preparation method thereof, which can solve the problem that the surface treatment requirement of a water-based epoxy paint on the surface of a base material is high in the prior art.

In order to solve the technical problems, the invention provides a low-surface treatment anticorrosive paint which comprises a component A and a component B;

wherein the component A comprises the following components in percentage by weight:

/>

the component B comprises the following components in percentage by weight:

wherein, the sustained-release capsule body is prepared by adopting the following method:

and dissolving benzotriazole in a solvent, adding a floatz material, soaking uniformly, and drying to obtain the sustained-release capsule body.

Further, the rheological agent comprises a first rheological agent and a second rheological agent, wherein the first rheological agent is selected from attapulgite, organic bentonite and/or hydrated magnesium silicate gel; the second rheology agent is selected from polyurethane associative rheology agents.

Further, the rust stabilizer is selected from potassium ferrocyanide.

Further, the auxiliary agent comprises a dispersing agent, a defoaming agent and a wetting agent.

Furthermore, the pigment filler comprises titanium dioxide, carbon black, barite powder and mica powder.

Further, the pigment and filler comprises the following components in percentage by weight: 6 to 11 percent of titanium dioxide; 0.1 to 0.3 percent of carbon black; 17% -22% of barite powder; 7 to 12 percent of mica powder.

Further, the component A also comprises hexagonal boron nitride, and the hexagonal boron nitride accounts for 4-8% of the component A by weight.

Further, the waterborne epoxy curing agent is selected from self-emulsifying modified polyamine or modified amine curing agent.

Further, the epoxy reactive diluent is selected from cardanol modified epoxy resin diluents.

The invention also provides a preparation method of the low-surface treatment anticorrosive paint, which comprises the following steps:

preparing a component A:

s1: adding water into a container according to the formula amount, and sequentially adding a dispersing agent, a wetting agent, a defoaming agent and a second rheological agent under a stirring state to uniformly disperse;

s2: sequentially adding titanium dioxide, carbon black, barite powder, hexagonal boron nitride and mica powder into the mixed solution of the S1 under a stirring state, and uniformly dispersing;

s3: adding an aqueous epoxy curing agent into the mixed solution of the S2 under a stirring state, and uniformly dispersing;

s4: sequentially adding an anti-flash rust agent, a rust stabilizer and a first rheological agent into the mixed solution of the S4 under a stirring state, and uniformly dispersing to obtain the component A;

preparing a component B: and (3) uniformly mixing the water-based epoxy resin, the epoxy active diluent and the adhesion promoter according to the formula, then adding the slow-release capsule body under the stirring state, and uniformly dispersing to obtain the component B.

In summary, compared with the prior art, in the low-surface-treatment anticorrosive coating provided by the invention, the slow-release capsule body adopts the pumice material, the natural pumice material has a rich multi-level capillary pore structure, the pore surface is rough and rich in active groups such as hydroxyl groups, benzotriazole can permeate into capillary pores of pumice, a high-concentration benzotriazole concentrate is formed after drying, the pumice loaded with the high-concentration benzotriazole can be used as a micro slow-release capsule body, so that an organic corrosion inhibitor slow-release component island can be provided for a coating system, when electrolyte permeates through a paint film and reaches a steel interface, the benzotriazole material is soaked and seeped in the electrolyte, the material can be complexed with iron ions seeped from the interface, the corrosion can be delayed to be continuously expanded, and meanwhile, the multi-level capillary pore microstructure of the pumice can also be controlled and prevented from being rapidly released and rapidly declining. In addition, compared with inorganic block corrosion inhibition materials, the organic corrosion inhibitor has better permeation resistance and is more suitable for low surface treatment, but the conventional organic corrosion inhibitor is directly added into a paint film and is easy to absorb water to cause the foaming of a coating, and the micro slow release capsule can also better solve the problem.

In addition, in the low surface treatment anticorrosive paint, the selected components have few hydrophilic groups, and the coating has excellent water resistance. Meanwhile, the coating has very low dynamic surface tension, can quickly permeate and infiltrate the corrosion layer after being sprayed, plays a good role in coating, and has excellent adhesive force on the low-surface treatment substrate.

In addition, the low surface treatment anticorrosive paint selects a rust stabilizer with higher activity and a controlled-release capsule with controllable release to stabilize a rust layer and slow down the continuous occurrence of rust, and the added boron nitride nanosheet layer can enhance the mechanical property of a paint film and provide a lamellar barrier, so that the low surface treatment anticorrosive paint has higher anticorrosive property under the condition of low surface treatment.

Detailed Description

The low surface treatment anticorrosive paint and the preparation method thereof proposed by the present invention are further described in detail with reference to the specific embodiments below. The advantages and features of the present invention will become more apparent from the following description.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. The methods described herein comprise a series of steps, and the order of such steps presented herein is not necessarily the only order in which such steps may be performed, and some of the described steps may be omitted and/or some other steps not described herein may be added to the methods. The compound raw materials in the present invention are commercially available raw materials, unless otherwise specified.

The invention aims to provide a low-surface-treatment anticorrosive paint and a preparation method thereof, which can solve the problem that the surface treatment requirement of a water-based epoxy paint on the surface of a base material is high in the prior art.

In order to realize the thought, the invention provides a low surface treatment anticorrosive paint which comprises a component A and a component B;

wherein the component A comprises the following components in percentage by weight:

the component B comprises the following components in percentage by weight:

wherein, the sustained-release capsule body is prepared by adopting the following method:

and dissolving benzotriazole in a high-permeability solvent, adding a micron-sized floatstone material, uniformly soaking at a medium temperature, and drying to obtain the sustained-release capsule.

According to the scheme of the invention, the slow release capsule body adopts the pumice material, the natural pumice material has a rich multi-level capillary channel structure, the surface of a channel is rough and rich in active groups such as hydroxyl groups, benzotriazole can infiltrate into the capillary channel of the pumice, a high-concentration benzotriazole concentrate is formed after drying, the pumice loaded with the high-concentration benzotriazole can be used as a micro slow release capsule body, so that an organic corrosion inhibitor slow release component island can be provided for a coating system, when electrolyte penetrates through a paint film to reach a steel interface, the benzotriazole material is infiltrated and seeped in the electrolyte, the material can be complexed with iron ions seeped from the interface, corrosion is delayed to continue to expand, and meanwhile, the multi-level capillary channel microstructure of the pumice can also be controlled and avoided, and the slow release material is rapidly released and rapidly faded. In addition, the organic corrosion inhibitor has better permeability resistance compared with inorganic block corrosion inhibition materials, and is more suitable for low surface treatment, but the conventional organic corrosion inhibitor is directly added into a paint film, so that the paint film is easy to absorb water to cause coating foaming, and the problem can be well solved by a micro slow-release capsule.

In addition, in the low-surface-treatment anticorrosive coating provided by the invention, the selected hydrophilic groups are few, and the coating has excellent water resistance.

In addition, the low-surface-treatment water-based epoxy anticorrosive paint has very low dynamic surface tension, can quickly permeate and infiltrate a rust layer after being sprayed, plays a good role in coating, and has excellent adhesive force on a low-surface-treatment base material.

Further, the rheological agent in the present invention may include a first rheological agent selected from attapulgite, organobentonite and/or hydrated magnesium silicate gel; the second rheology agent is selected from polyurethane associative rheology agents. Wherein, the first rheological agent and the second rheological agent respectively account for 8 to 17 percent and 0.5 to 1 percent of the component A by mass percentage.

Preferably, the rust stabilizer is selected from potassium ferrocyanide. The potassium ferrocyanide as a rust stabilizer can make the bottom rust layer of the low-surface treatment substrate lose the reactivity and prevent further rust.

Further, the auxiliary agent comprises a dispersing agent, a defoaming agent and a wetting agent. Wherein, the mass percentages of the dispersant, the defoamer and the wetting agent in the component A can be respectively 0.7-1%; 0.3% -0.5%;0.3 to 0.5 percent. The wetting agent may be a low foaming acetylenic diol type wetting agent effective in reducing static and dynamic surface tension.

Further, the pigment and filler comprises titanium dioxide, carbon black, barite powder and mica powder, wherein the barite powder can be ultrafine barite powder, and the mica powder is muscovite powder. The pigment and filler comprises the following components in percentage by weight of the component A: 6 to 11 percent of titanium dioxide; 0.1 to 0.3 percent of carbon black; 17% -22% of barite powder; 7 to 12 percent of mica powder.

Preferably, the component A further comprises hexagonal boron nitride, and the hexagonal boron nitride accounts for 4-8% of the component A by weight. The hexagonal boron nitride is a boron nitride nanosheet with a disc diameter of 200-500nm. The hexagonal boron nitride nanosheets distributed in the coating can effectively enhance the mechanical property of the coating and prevent the coating from being easily damaged, the nanosheets structure is also beneficial to better penetration of the coating, better provides a barrier effect on a base material and long-acting corrosion resistance, and the base material with low surface treatment can achieve the same protection effect of a conventional coating on a well-treated base material.

Furthermore, the waterborne epoxy curing agent is selected from low-viscosity self-emulsifying modified polyamine or modified amine curing agent, can well emulsify liquid epoxy resin, and has good permeability. The epoxy active diluent is selected from cardanol modified epoxy resin diluents. The preparation method adopts low-viscosity self-emulsifying modified polyamine with high permeability and a modified amine aqueous curing agent, and can permeate into a metal oxide layer structure to be cured by matching with low-molecular aqueous epoxy resin and a low-viscosity bifunctional cardanol modified epoxy resin diluent. Among them, the epoxy equivalent of the aqueous epoxy resin of the present invention is preferably 180 to 200.

Preferably, before the low-surface anticorrosive paint is coated and used, the component A and the component B are mixed according to the weight ratio of A: B = 100.

The invention also provides a preparation method of the low-surface treatment anticorrosive paint, which comprises the following steps:

preparing a component A:

s1: weighing deionized water according to a formula, adding the deionized water into a container, sequentially adding a dispersing agent, a wetting agent, a defoaming agent and a second rheological agent under a stirring state, and stirring and dispersing for about 10 minutes to uniformly disperse the solution;

s2: then, under the condition of medium-speed stirring, sequentially adding titanium dioxide, carbon black, barite powder, hexagonal boron nitride and mica powder into the mixed solution of the S1, then increasing the rotating speed of a dispersing agent to uniformly disperse the solution, and then turning the mixed solution into a grinding machine to grind the mixed solution until the fineness is less than or equal to 45 mu m;

s3: adding an aqueous epoxy curing agent into the mixed solution of the S2 under the condition of medium-speed stirring, and dispersing for about 15 minutes uniformly;

s4: sequentially adding an anti-flash rust agent, a potassium ferrocyanide rust stabilizer and a first rheological agent prepared in advance into the mixed solution of the S4 under the condition of medium-speed stirring, uniformly dispersing, and then subpackaging and storing according to the packaging requirements to obtain the component A;

preparing a component B: uniformly mixing the water-based epoxy resin, the epoxy active diluent and the adhesion promoter according to the formula, then adding the slow-release capsule body under the stirring state, and uniformly dispersing to obtain the component B. Specifically, the sustained release capsule body needs to be prepared in advance, and the preparation method can be as follows: in a clean container, 20-40 parts of ethanol/water (1) is used as a solvent to be poured into the container, then the temperature is raised to 50-70 ℃, 15-40 parts of benzotriazole are added to be stirred at medium speed until the benzotriazole is completely dissolved; adding 35-55 parts of pumice material, dispersing at medium temperature such as 50-70 deg.C for 0.5-3 hr to make the solution infiltrate into the pumice material, pouring out the slurry, and drying in 50 deg.C vacuum drying oven. And (3) primarily grinding the dried powder until the size of main particles is less than 100 microns to obtain the sustained-release capsule. Then according to the formula of the component B, adding the water-based epoxy resin, the epoxy active diluent and the adhesion promoter into a clean anhydrous drawing cylinder for dispersing for 15 minutes at a medium speed, uniformly mixing, adding the prepared sustained-release capsule according to the weight percentage of the formula under the condition of medium-speed stirring, dispersing for 0.5-3 hours at a medium speed to obtain a uniform solution, and then subpackaging and storing to obtain the component B.

For a further understanding of the present invention, preferred embodiments of the present invention will be described below in conjunction with more detailed specific embodiments to highlight the features and characteristics of the low surface treatment anticorrosive coatings provided by the present invention. The description is only intended to illustrate the features and advantages of the method of the invention, and not to limit the scope of protection of the invention.

According to different proportions of components in the paint, the invention provides the following 3 examples to describe the formula composition of the low surface treatment anticorrosive paint.

Wherein, the raw materials of the component A and the component B in the low surface treatment anticorrosive coatings of the examples 1 to 3 are the same, the difference is that the mixture ratio of the components in each example is different, and the mixture ratio (parts by weight) of the components in the coatings of the examples 1 to 3 is shown in the following table 1.

Wherein, the raw materials in each example are all commercial raw materials, the water-based epoxy curing agent is selected from Aradur 38-1 produced by Hensman company, the dispersing agent is Disperbyk 190 of Bike chemistry, the wetting agent is selected from Dynol 604 and Dynol 607 of Yingchu special chemistry, the defoaming agent is purchased from BYK022 and BYK1789 of Bike chemistry, and the first rheological agent is preferably 6 percent content hydrogel prepared by Bentone DE of Haimase; the second rheological agent is selected from Rheolate 299 of Haimax, and the anti-flash rust agent is selected from organic metal chelate or mixture of organic metal chelate and small amount of nitrate, and is selected from NALZIN FA 179 of Haimax; the rust stabilizer is preferably potassium ferrocyanide, and industrial products of new materials from Jinan Yuchuan company Limited are selected, and the content is more than or equal to 99 percent; the titanium dioxide is a titanium dioxide product sold in the chemical industry market; the carbon black is LAMPBLACK 101 from ORION corporation; the barite powder is directly purchased from the market; the hexagonal boron nitride is selected from Shanghai radish micro-application materials, the main sheet diameter is 500nm, and the content of the nano hexagonal boron nitride is more than 99 percent; the mica powder is selected from 300-500 meshes of mica powder on the market; the water-based epoxy resin is NPEL-128 of south Asia; the epoxy active diluent adopts Nasurfar PLR 602 of the mature biotin-resistant biomaterial science and technology limited; the adhesion promoter is Z6040 produced by Dow Corning. The micron-sized pumice is selected from Zhejiang Hengkun building materials GmbH; benzotriazole is selected from Shanghai Aladdin reagent Co.

TABLE 1 component A ratio of each example in the low surface treatment anticorrosive paint

TABLE 2 component B ratio in Low surface treatment anticorrosive coatings

Raw material of component B	Example 1	Example 2	Example 3
				Water-based epoxy resin	79％	74％	65％
Epoxy reactive diluent	8％	18％	10％
				Adhesion promoter	12％	3％	2％
Sustained release capsule	1％	6％	23％

TABLE 3 Mass ratio of component A to component B before use of anticorrosive paint for low surface treatment

Ratio of A component to B component	Example 1	Example 2	Example 3
				A:B	100:33	100:25	100:40

The preparation methods of the A component of the low surface treatment anticorrosive coatings of examples 1 to 3 were all prepared according to the preparation methods described above. In the preparation method of the component B, because the contents of the reagents selected in the preparation method of the sustained-release capsule are different, the differences are slight, and specifically, in the component B of examples 1 to 3, the preparation methods of the sustained-release capsule selected in each example are respectively as follows:

the method for preparing the sustained release capsule in the B component of example 1 is as follows: pouring 40 parts of ethanol/water (1); and adding 35 parts of pumice material, dispersing at high speed for 0.5-3 hours, pouring out the slurry after uniform dispersion, and drying completely in a vacuum drying oven at 50 ℃. And (3) primarily grinding the dried powder until the size of main particles is less than 100 microns to obtain the sustained-release capsule.

The method for preparing the sustained release capsule in the B component of example 2 is as follows: in a clean container, pouring 20 parts of ethanol/water (1); and adding 40 parts of pumice material, dispersing at high speed for 0.5-3 hours, pouring out the slurry after uniform dispersion, and drying completely in a vacuum drying oven at 50 ℃. And (3) primarily grinding the dried powder until the size of main particles is less than 100 microns to obtain the sustained-release capsule.

The method of preparation of the sustained release capsules in component B of example 3 is as follows: pouring 30 parts of ethanol/water (1); and adding 55 parts of pumice material, dispersing at a high speed for 0.5-3 hours, pouring the slurry after uniform dispersion, and drying completely in a vacuum drying oven at 50 ℃. And (3) primarily grinding the dried powder until the size of main particles is less than 100 microns to obtain the sustained-release capsule.

The low surface treatment anticorrosive coatings of three examples were mixed with the component A and the component B according to the ratio shown in Table 3 before use.

When the low surface treatment anticorrosive paint provided by the invention is used, the low surface treatment anticorrosive paint can be used according to the following method:

the coating has low requirement on surface treatment of the surface of the base material before use, can simply treat the surface of the base material to be coated, and can be constructed for coating;

before construction, the component A and the component B of the coating are uniformly mixed according to the mixture ratio shown in the table 3;

and then coating the surface of the substrate subjected to low surface treatment, wherein single-pass spraying or multi-pass spraying can be carried out during coating, the coating thickness of a wet film can reach 300 mu m, and the low surface treatment anticorrosive coating disclosed by the invention basically cannot generate a sagging phenomenon during coating.

In order to verify the performance effect of the low surface treatment anticorrosive coatings of examples 1 to 3 of the present invention, the coating performance of the coatings of examples 1 to 3 of the present invention is tested, and the existing anticorrosive coatings in the prior art are used as a control group, the coatings of examples 1 to 3 and the coatings of the control group are respectively coated on the surface of the low surface treatment substrate according to the coating process, and then the performance of the coating is evaluated to obtain the performance data of the coatings of examples 1 to 3 and the control group.

The formula of the anticorrosive paint in the prior art of the control group is as follows:

component A

B component

89% of liquid epoxy resin; NPEL-128 from south Asia was used.

10% of epoxy reactive diluent; adopts Nasurfar PLR 602 of the technical limited of the well-done antibiotic-resistant biological material

1% of adhesion promoter; z6040 produced by Dow Corning is adopted.

Before use, the ratio of the component A to the component B is 100

In testing the performance of the coating, the coating layer applied to the surface of the substrate was subjected to performance tests according to the test items and test standards as shown in table 4 below.

TABLE 4 coating test standards

The coatings of examples 1 to 3 and the control were tested for their properties according to the test indexes of Table 4 above, and the results are shown in Table 5 below.

Table 5 below reflects the paint performance effects of inventive examples 1-3 as well as the control.

TABLE 5 comparison of coating Properties for control and examples 1-3

Through the comparison tests, compared with the common coating in the prior art, the low-surface-treatment anticorrosive coating provided by the invention has more excellent adhesion, flexibility, impact resistance and salt spray resistance when being applied to a low-surface-treatment base material, and can take account of both the coating process and the anticorrosive performance.

In summary, compared with the prior art, in the low-surface-treatment anticorrosive coating provided by the invention, the slow-release capsule body adopts the pumice material, the natural pumice material has a rich multi-level capillary pore structure, the pore surface is rough and rich in active groups such as hydroxyl groups, benzotriazole can permeate into capillary pores of pumice, a high-concentration benzotriazole concentrate is formed after drying, the pumice loaded with the high-concentration benzotriazole can be used as a micro slow-release capsule body, so that an organic corrosion inhibitor slow-release component island can be provided for a coating system, when electrolyte permeates through a paint film and reaches a steel interface, the benzotriazole material is soaked and seeped in the electrolyte, the material can be complexed with iron ions seeped from the interface, the corrosion can be delayed to be continuously expanded, and meanwhile, the multi-level capillary pore microstructure of the pumice can also be controlled and prevented from being rapidly released and rapidly declining. In addition, the organic corrosion inhibitor has better permeability resistance compared with inorganic block corrosion inhibition materials, and is more suitable for low surface treatment, but the conventional organic corrosion inhibitor is directly added into a paint film, so that the paint film is easy to absorb water to cause coating foaming, and the problem can be well solved by a micro slow-release capsule.

In addition, in the low-surface treatment anticorrosive paint, the selected hydrophilic groups are few, and the coating has excellent water resistance. Meanwhile, the coating has very low dynamic surface tension, can quickly permeate and infiltrate the corrosion layer after being sprayed, plays a good role in coating, and has excellent adhesive force on the low-surface treatment substrate.

In addition, the low surface treatment anticorrosive paint selects a rust stabilizer with higher activity and a controlled-release capsule with controllable release to stabilize a rust layer and slow down the continuous occurrence of rust, and the added boron nitride nanosheet layer can enhance the mechanical property of a paint film and provide a lamellar barrier, so that the low surface treatment anticorrosive paint has higher anticorrosive property under the condition of low surface treatment.

The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims. It will be apparent to those skilled in the art that various changes and modifications may be made in the invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. The low surface treatment anticorrosive paint is characterized by comprising a component A and a component B;

wherein the component A comprises the following components in percentage by weight:

the component B comprises the following components in percentage by weight:

wherein, the sustained-release capsule body is prepared by adopting the following method:

and dissolving benzotriazole in a solvent, adding a floatstone material, soaking uniformly, and drying to obtain the sustained-release capsule.

2. The low surface treatment anticorrosive coating according to claim 1, wherein the rheological agent comprises a first rheological agent and a second rheological agent, and the first rheological agent is selected from attapulgite, organic bentonite and/or hydrated magnesium silicate gel; the second rheology agent is selected from polyurethane associative rheology agents.

3. The low surface treatment anticorrosive paint according to claim 1, wherein the rust stabilizer is selected from potassium ferrocyanide.

4. The low surface treatment anticorrosive paint according to claim 1, wherein the auxiliary agent comprises a dispersant, an antifoaming agent and a wetting agent.

5. The low surface treatment anticorrosive paint according to claim 1, wherein the pigment and filler comprise titanium dioxide, carbon black, barite powder and mica powder.

6. The low surface treatment anticorrosive paint according to claim 5, wherein the pigment and filler comprises the following components in percentage by weight: 6 to 11 percent of titanium dioxide; 0.1 to 0.3 percent of carbon black; 17% -22% of barite powder; 7 to 12 percent of mica powder.

7. The low surface treatment anticorrosive paint according to claim 1, characterized in that the component A further comprises hexagonal boron nitride, and the hexagonal boron nitride accounts for 4-8 wt% of the component A.

8. The low surface treatment anticorrosive paint according to claim 1, wherein the aqueous epoxy curing agent is selected from self-emulsifying modified polyamine or modified amine curing agent.

9. The low surface treatment anticorrosive paint according to claim 1, wherein the epoxy reactive diluent is selected from cardanol modified epoxy resin diluents.

10. A method for preparing the low surface treatment anticorrosive paint according to any one of claims 1 to 9, characterized by comprising the steps of:

preparing a component A:

s1: adding water into a container according to the formula amount, and sequentially adding a dispersing agent, a wetting agent, a defoaming agent and a second rheological agent under a stirring state to uniformly disperse;

s2: sequentially adding titanium dioxide, carbon black, barite powder, hexagonal boron nitride and mica powder into the mixed solution of the S1 under a stirring state, and uniformly dispersing;

s3: adding an aqueous epoxy curing agent into the mixed solution of the S2 under a stirring state, and uniformly dispersing;

s4: sequentially adding an anti-flash rust agent, a rust stabilizer and a first rheological agent into the mixed solution of the S4 under a stirring state, and uniformly dispersing to obtain the component A;

preparing a component B: and (3) uniformly mixing the water-based epoxy resin, the epoxy active diluent and the adhesion promoter according to the formula, then adding the slow-release capsule body under the stirring state, and uniformly dispersing to obtain the component B.