Anti-corrosion solvent-free coating and preparation method thereof

Abstract

The invention discloses an anti-corrosion solvent-free coating and a preparation method thereof, and relates to the technical field of anti-corrosion coatings. The preparation method comprises the following steps: firstly, carrying out cross-linking on octahydro-4, 7-methyl-1H-methylene diisocyanate and polyhydric alcohol to prepare polyurethane; when two isocyanates of octahydro-4, 7-methyl-1H-methylene diisocyanate are cross-linked with polyhydric alcohols, a three-dimensional network structure can be formed, hydrophobic branched chains can orderly extend to the surface, the distance and the arrangement mode between the branched chains are beneficial to preventing water molecules from entering, and the water resistance of the coating is effectively improved; then, nano silicon dioxide is used for loading methylbenzotriazole to serve as a preservative; when the coating is cured, the methylbenzotriazole can be released and dispersed into the coating along with chemical reaction and change of a coating structure, tiny pores in the coating are further filled, the methylbenzotriazole can interact with active sites on the metal surface more directly, and the anti-corrosion efficiency is improved. The anti-corrosion solvent-free coating prepared by the invention has water-resistant and anti-corrosion effects.

Description

Technical Field

[0001] The present invention relates to the technical field of anticorrosive coatings, and particularly to an anticorrosive solvent-free coating and a preparation method thereof. Background Art

[0002] Coatings, known as paints in traditional Chinese names. A so-called coating is a viscous liquid that is applied to the surface of an object to be protected or decorated and can form a continuous film firmly attached to the object to be coated. It is usually mainly composed of resin, or oil, or emulsion, with or without pigments and fillers, and corresponding additives are added, and it is prepared with organic solvents or water. And solvent-based anticorrosive coatings themselves contain a large amount of benzene solvents, which bring great harm to construction workers and the environment during use, running counter to the concept of green environmental protection.

[0003] Metal corrosion spreads throughout all fields of the national economy and national defense construction, and the harm is very serious. First of all, corrosion will cause significant direct or indirect economic losses. According to statistics in industrially developed countries, the economic losses caused by corrosion account for about 1.5% - 4.2% of the annual gross national product. Secondly, metal corrosion, especially stress corrosion and corrosion fatigue, often causes catastrophic major accidents and endangers personal safety. Moreover, corrosion not only consumes a large amount of metal, but also wastes a large amount of energy. Every year, 10% - 20% of metals are lost due to corrosion. In addition, in industrial production such as petroleum, chemical industry, and pesticides, the running, dripping, and leaking of equipment caused by corrosion not only cause economic losses, but also may cause the leakage of toxic substances, resulting in environmental pollution and endangering people's health. At the same time, corrosion may also become an obstacle to the development of production and scientific and technological progress.

[0004] Therefore, the research and development of anticorrosive solvent-free coatings is of great significance for protecting human health. Summary of the Invention

[0005] The purpose of the present invention is to provide an anticorrosive solvent-free coating and a preparation method thereof to solve the problems existing in the prior art.

[0006] To solve the above technical problems, the present invention provides the following technical solution: An anticorrosive solvent-free coating is composed of a first component and a second component.

[0007] The first component is composed of the following components in parts by weight: 45 - 60 parts of polyol, 5 - 15 parts of functional additives, 30 - 45 parts of filler, 10 - 15 parts of epoxy resin, 10 - 20 parts of thermosetting polyacrylate, 0.5 - 3 parts of anticorrosive additive;

[0008] The second component is composed of the following component in parts by weight: 26 - 58 parts of octahydro-4,7-methyl-1H-methylene diisocyanate prepolymer;

[0009] The anti-corrosion auxiliary agent is nano-silica loaded with methylbenzotriazole.

[0010] Furthermore, the polyol includes one or more of polyester diol, polyether diol and polyether triol.

[0011] Furthermore, the functional auxiliary agent includes one or more of a dispersant, an antifoaming agent and a leveling agent.

[0012] Furthermore, the dispersant includes one or more of fatty acid, DY-9006 or metal soap dispersant; the antifoaming agent is one or more of silicone antifoaming agent, higher alcohol antifoaming agent and polyether antifoaming agent; the leveling agent is one or more of acrylic leveling agent, silicone leveling agent and fluorocarbon leveling agent.

[0013] Furthermore, the filler is one or more of bentonite, titanium dioxide and barium sulfate.

[0014] Furthermore, the epoxy resin is one or more of bisphenol A type epoxy resin and bisphenol F type epoxy resin.

[0015] Furthermore, the preparation method of the octahydro-4,7-methyl-1H-methylene diisocyanate prepolymer includes the following steps:

[0016] A. Dehydrate the polyol at 130-140 Pa and 110-120 °C for 1-3 h to obtain dehydrated polyol; B. Mix the dehydrated polyol with octahydro-4,7-methyl-1H-methylene diisocyanate at a molar ratio of 1:2-4, and react at 200 r / min and 80 °C for 2-3 h.

[0017] Furthermore, the preparation method of the anti-corrosion auxiliary agent includes the following preparation steps:

[0018] a. Place the nano-silica in a microwave oven, heat it at 800 w high fire for 3-5 min, and cool it to room temperature to obtain activated nano-silica; b. Dissolve methylbenzotriazole in ethanol 4-6 times the mass of methylbenzotriazole, add activated nano-silica 3-5 times the mass of methylbenzotriazole, ultrasonically vibrate at 200 W for 4-6 h, filter, and dry to obtain the anti-corrosion auxiliary agent.

[0019] Furthermore, the particle size of the nano-silica is 50-80 nm.

[0020] Furthermore, the preparation method of the anti-corrosion solvent-free coating includes the following preparation steps: Mix the first component and the second component according to the weight ratio, and after mixing evenly, filter and discharge to obtain the anti-corrosion solvent-free coating.

[0021] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0022] In the present invention, a polyurethane solvent-free coating is first prepared by crosslinking octahydro-4,7-methyl-1H-methylene diisocyanate and a polyol, and then a nano-silica preservative loaded with methylbenzotriazole is added to obtain an anti-corrosion solvent-free coating, so as to achieve the effects of water resistance and anti-corrosion.

[0023] First, a polyurethane is prepared by crosslinking octahydro-4,7-methyl-1H-methylene diisocyanate and a polyol; when the two isocyanates of octahydro-4,7-methyl-1H-methylene diisocyanate crosslink with the polyol, a three-dimensional network structure will be formed. This crosslinked structure helps to improve the strength and stability of the polyurethane coating. At the same time, the hydrophobic branches can extend to the surface orderly, and the distance and arrangement between them are beneficial to preventing the entry of water molecules, and a structure similar to a hydrophobic layer can be formed, effectively improving the water resistance of the coating, preventing water from penetrating into the interior of the coating, protecting the coated object from water erosion, and the hydrophobic layer can serve as a barrier to reduce the damage of corrosive chemicals to the coating and the coated object, and improve the corrosion resistance of the coating.

[0024] Secondly, nano-silica loaded with methylbenzotriazole is used as a preservative; the nano-silica particles are filled in the pores of the polyurethane coating, which can increase the density of the coating and form a physical barrier to prevent the penetration of corrosive substances such as water, oxygen, acids and alkalis into the interior of the coating, thereby protecting the coated object from corrosion; when the polyurethane solvent-free coating is cured, with the chemical reaction and the change of the coating structure, the interaction between methylbenzotriazole and nano-silica will weaken or even be destroyed, and methylbenzotriazole will be released and dispersed into the coating, further filling the micro-pores in the coating, and can interact more directly with the active sites on the metal surface, improving the anti-corrosion efficiency, especially in some micro-defects or parts that are difficult to cover by nano-silica, making up for the deficiency of anti-corrosion. Nano-silica has a large specific surface area and surface activity, and can adsorb more methylbenzotriazole molecules, making it slowly release on the metal surface and prolonging the anti-corrosion time. Specific embodiments

[0025] Next, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

[0026] In order to more clearly illustrate the method provided by the present invention, the following embodiments are used for detailed description. The test methods for each index of the anti-corrosion solvent-free coating prepared in the following embodiments are as follows:

[0027] Hardness: For the coatings cured from the anticorrosive solvent-free coatings prepared from the same mass of the examples and comparative examples, test their hardness according to the standard of GB / T 6739-2006 "Determination of film hardness by pencil method for paints and varnishes".

[0028] Water resistance: For the coatings cured from the anticorrosive solvent-free coatings prepared from the same mass of the examples and comparative examples, place them in water for 200 h, and observe whether there are blisters, peeling and color fading.

[0029] Salt spray resistance: For the coatings cured from the anticorrosive solvent-free coatings prepared from the same mass of the examples and comparative examples, test their salt spray resistance according to GB / T 1771-1991 "Determination of resistance to neutral salt spray of paints and varnishes".

[0030] Chemical corrosion resistance: For the coatings cured from the anticorrosive solvent-free coatings prepared from the same mass of the examples and comparative examples, place them in a mixed solution formed by 10 wt% sulfuric acid, 30 wt% sodium chloride, 30 wt% sodium hydroxide and No. 2 diesel oil, and keep them for 30 days, and observe whether there is damage or corrosion.

[0031] Example 1

[0032] A preparation method of an anticorrosive solvent-free coating includes the following preparation steps:

[0033] (1) Preparation of octahydro-4,7-methyl-1H-methylene diisocyanate prepolymer:

[0034] A. Dehydrate polycaprolactone diol at 130 Pa and 110 °C for 2 h to obtain dehydrated polycaprolactone diol; B. Mix dehydrated polycaprolactone diol with octahydro-4,7-methyl-1H-methylene diisocyanate at a molar ratio of 1:2, and react at 200 r / min and 80 °C for 2 h;

[0035] (2) Preparation of anticorrosive auxiliary agent:

[0036] a. Place nano-silica in a microwave oven, heat it at high power of 800 w for 3 min, and cool it to room temperature to obtain activated nano-silica; b. Dissolve methylbenzotriazole in ethanol with a mass 4 times that of methylbenzotriazole, add activated nano-silica with a mass 3 times that of methylbenzotriazole, ultrasonically vibrate at 200 W for 4 h, filter, and dry to obtain the anticorrosive auxiliary agent;

[0037] (3) Mix the first component and the second component according to the weight ratio, and after mixing evenly, filter and discharge to obtain the anti-corrosion solvent-free coating; the first component includes: 45 parts of polycaprolactone diol, 2 parts of polydimethylsiloxane, 2 parts of butyl acrylate, 1 part of DY-9006, 30 parts of bentonite, 10 parts of bisphenol A epoxy resin, 10 parts of thermosetting polyacrylate, 0.5 part of anti-corrosion additive; the second component includes: 42 parts of octahydro-4,7-dimethyl-1H-methylene diisocyanate prepolymer.

[0038] Example 2

[0039] A preparation method of an anti-corrosion solvent-free coating includes the following preparation steps:

[0040] (1) Preparation of octahydro-4,7-dimethyl-1H-methylene diisocyanate prepolymer:

[0041] A. Dehydrate polycaprolactone diol at 135 Pa and 115 °C for 2 h to obtain dehydrated polycaprolactone diol; B. Mix the dehydrated polycaprolactone diol and octahydro-4,7-dimethyl-1H-methylene diisocyanate at a molar ratio of 1:3, and react at 200 r / min and 80 °C for 2.5 h.

[0042] (2) Preparation of anti-corrosion additive:

[0043] a. Place nano-silica in a microwave oven and heat it at high power of 800 w for 4 min, and cool it to room temperature to obtain activated nano-silica; b. Dissolve methylbenzotriazole in ethanol 5 times the mass of methylbenzotriazole, add activated nano-silica 4 times the mass of methylbenzotriazole, ultrasonically vibrate at 200 W for 5 h, filter, and dry to obtain the anti-corrosion additive.

[0044] (3) Mix the first component and the second component according to the weight ratio, and after mixing evenly, filter and discharge to obtain the anti-corrosion solvent-free coating; the first component includes: 55 parts of polycaprolactone diol, 5 parts of polydimethylsiloxane, 3 parts of butyl acrylate, 2 parts of DY-9006, 35 parts of bentonite, 13 parts of bisphenol A epoxy resin, 15 parts of thermosetting polyacrylate, 2 parts of anti-corrosion additive; the second component includes: 48 parts of octahydro-4,7-dimethyl-1H-methylene diisocyanate prepolymer.

[0045] The problem in Example 3 is as above

[0046] A preparation method of an anti-corrosion solvent-free coating includes the following preparation steps:

[0047] (1) Preparation of octahydro-4,7-dimethyl-1H-methylene diisocyanate prepolymer:

[0048] A. Polycaprolactone diol was dehydrated at 140 Pa and 120 °C for 3 h to obtain dehydrated polycaprolactone diol; B. The dehydrated polycaprolactone diol was mixed with octahydro-4,7-dimethyl-1H-methylene diisocyanate at a molar ratio of 1:4 and reacted at 200 r / min and 80 °C for 3 h;

[0049] (2) Preparation of the anti-corrosion additive:

[0050] a. Nano-silica was placed in a microwave oven and heated at high power of 800 w for 5 min, and then cooled to room temperature to obtain activated nano-silica; b. Methylbenzotriazole was dissolved in ethanol six times the mass of methylbenzotriazole, and activated nano-silica five times the mass of methylbenzotriazole was added, and ultrasonic oscillation was carried out at 200 W for 6 h, filtered, and dried to obtain the anti-corrosion additive;

[0051] (3) The first component and the second component were mixed according to the weight ratio, and after mixing evenly, filtered and discharged to obtain the anti-corrosion solvent-free coating; The first component includes: 60 parts of polycaprolactone diol, 5 parts of polydimethylsiloxane, 5 parts of polybutyl acrylate, 65 parts of DY-9006, 45 parts of bentonite, 15 parts of bisphenol A epoxy resin, 20 parts of thermosetting polyacrylate, 3 parts of anti-corrosion additive; The second component includes: 58 parts of octahydro-4,7-dimethyl-1H-methylene diisocyanate prepolymer.

[0052] Comparative Example 1

[0053] The difference between Comparative Example 1 and Example 2 is that step (1) is different. Step (1) was changed to: Polycaprolactone diol was dehydrated at 135 Pa and 115 °C for 2 h to obtain dehydrated polycaprolactone diol; B. The dehydrated polycaprolactone diol was mixed with toluene diisocyanate at a molar ratio of 1:3 and reacted at 200 r / min and 80 °C for 2.5 h to obtain toluene diisocyanate prepolymer; Step (3) was changed to: The first component and the second component were mixed according to the weight ratio, and after mixing evenly, filtered and discharged to obtain the anti-corrosion solvent-free coating; The first component includes: 55 parts of polycaprolactone diol, 5 parts of polydimethylsiloxane, 3 parts of polybutyl acrylate, 62 parts of DY-9006, 35 parts of bentonite, 13 parts of bisphenol A epoxy resin, 15 parts of thermosetting polyacrylate, 2 parts of anti-corrosion additive; The second component includes: 48 parts of toluene diisocyanate prepolymer; The remaining steps are the same as those in Example 2.

[0054] Comparative Example 2

[0055] The difference between Comparative Example 2 and Example 2 is that step (1) is absent, and step (3) is changed to: mixing the first component and the second component according to the weight ratio, filtering and discharging after mixing evenly to obtain an anti-corrosion solvent-free coating; the first component includes: 55 parts of polycaprolactone diol, 5 parts of polydimethylsiloxane, 3 parts of polybutyl acrylate, 2 parts of DY-9006, 35 parts of bentonite, 13 parts of bisphenol A epoxy resin, 15 parts of thermosetting polyacrylate, and 2 parts of anti-corrosion additive; the second component includes: 48 parts of octahydro-4,7-dimethyl-1H-methylene diisocyanate; the remaining steps are the same as those in Example 2.

[0056] Comparative Example 3

[0057] The difference between Comparative Example 3 and Example 2 is that step (2) is absent, and step (3) is changed to: mixing the first component and the second component according to the weight ratio, filtering and discharging after mixing evenly to obtain an anti-corrosion solvent-free coating; the first component includes: 55 parts of polycaprolactone diol, 5 parts of polydimethylsiloxane, 3 parts of polybutyl acrylate, 2 parts of DY-9006, 35 parts of bentonite, 13 parts of bisphenol A epoxy resin, 15 parts of thermosetting polyacrylate, and 2 parts of methylbenzotriazole; the second component includes: 48 parts of octahydro-4,7-dimethyl-1H-methylene diisocyanate prepolymer; the remaining steps are the same as those in Example 2.

[0058] Comparative Example 4

[0059] The difference between Comparative Example 4 and Example 2 is that step (2) is absent, and step (3) is changed to: mixing the first component and the second component according to the weight ratio, filtering and discharging after mixing evenly to obtain an anti-corrosion solvent-free coating; the first component includes: 55 parts of polycaprolactone diol, 5 parts of polydimethylsiloxane, 3 parts of polybutyl acrylate, 2 parts of DY-9006, 35 parts of bentonite, 13 parts of bisphenol A epoxy resin, 15 parts of thermosetting polyacrylate, and 2 parts of nano-silica; the second component includes: 48 parts of octahydro-4,7-dimethyl-1H-methylene diisocyanate prepolymer; the remaining steps are the same as those in Example 2.

[0060] Comparative Example 5

[0061] The difference between Comparative Example 5 and Example 2 is that step (2) is absent, and step (3) is changed to: mixing the first component and the second component according to the weight ratio, filtering and discharging after mixing evenly to obtain an anti-corrosion solvent-free coating; the first component includes: 55 parts of polycaprolactone diol, 5 parts of polydimethylsiloxane, 3 parts of polybutyl acrylate, 2 parts of DY-9006, 35 parts of bentonite, 13 parts of bisphenol A epoxy resin, 15 parts of thermosetting polyacrylate; the second component includes: 48 parts of octahydro-4,7-dimethyl-1H-methylene diisocyanate prepolymer; the remaining steps are the same as those in Example 2.

[0062] Comparative Example 6

[0063] The difference between Comparative Example 6 and Example 2 is that step (2) is absent, and step (3) is changed to: mixing the first component and the second component according to the weight ratio, filtering and discharging after mixing evenly to obtain the anti-corrosion solvent-free coating; the first component includes: 55 parts of polycaprolactone diol; 5 parts of polydimethylsiloxane, 3 parts of butyl acrylate, 2 parts of DY-9006, 35 parts of bentonite, 13 parts of bisphenol A type epoxy resin, 15 parts of thermosetting polyacrylate, 1 part of nano-silica, 1 part of methylbenzotriazole; the second component includes: 48 parts of octahydro-4,7-methyl-1H-methylene diisocyanate prepolymer; the remaining steps are the same as those in Example 2.

[0064] Comparative Example 7

[0065] The difference between Comparative Example 1 and Example 2 is that step (2) is different. Step (2) is changed to: dissolving methylbenzotriazole in ethanol with a mass 5 times that of methylbenzotriazole, adding nano-silica with a mass 4 times that of methylbenzotriazole, ultrasonic vibrating at 200W for 5h, filtering, and drying to obtain the anti-corrosion additive; the remaining steps are the same as those in Example 2.

[0066] Effect Example

[0067] The following Table 1 gives the performance analysis results of the anti-corrosion solvent-free coatings of Examples 1 to 3 and Comparative Examples 1 to 7 of the present invention.

[0068] Table 1

[0069] Hardness Water resistance Salt spray resistance performance Chemical corrosion resistance performance Example 1 5H None ＞1000h None Example 2 5H None ＞1000h None Example 3 5H None ＞1000h None Comparative example 1 4H Yes 800～900h Slight Comparative example 2 4H Yes 600～800h None Comparative example 3 5H None 500～800h Severe Comparative example 4 5H None 500～800h Severe Comparative example 5 5H Yes 300～400h Very severe Comparative example 6 5H None 800～900h Slight Comparative example 7 5H None 800～900h Slight

[0070] From the comparison of the experimental data of Example 2 with Comparative Examples 1 and 2, it can be found that in the present invention, polyurethane is prepared by cross-linking octahydro-4,7-dimethyl-1H-methylene diisocyanate and polyol; when the two isocyanates of octahydro-4,7-dimethyl-1H-methylene diisocyanate cross-link with polyol, a three-dimensional network structure will be formed. This cross-linked structure helps to improve the strength and stability of the polyurethane coating. At the same time, the hydrophobic side chains can extend orderly to the surface, and the distance and arrangement between them are beneficial to preventing the entry of water molecules, and a structure similar to a hydrophobic layer can be formed, effectively improving the water resistance of the coating, preventing water from penetrating into the interior of the coating, protecting the coated object from water erosion, and the hydrophobic layer can act as a barrier to reduce the damage of corrosive chemicals to the coating and the coated object, improving the corrosion resistance of the coating; from the comparison of the experimental data of Example 2 with Comparative Examples 3, 4, 5 and 6, it can be found that nano-silica loaded with methylbenzotriazole is used as an anti-corrosion agent; the nano-silica particles are filled in the pores of the polyurethane coating, which can increase the density of the coating and form a physical barrier to prevent corrosive substances such as water, oxygen, acids and alkalis from penetrating into the interior of the coating, thereby protecting the coated object from corrosion; when the polyurethane solvent-free coating cures, with the chemical reaction and the change of the coating structure, the interaction force between methylbenzotriazole and nano-silica will weaken or even be destroyed, and methylbenzotriazole will be released and dispersed into the coating, further filling the micro-pores in the coating, and can interact more directly with the active sites on the metal surface, improving the anti-corrosion efficiency, especially in some micro-defects or parts that are difficult to cover by nano-silica, making up for the deficiency of anti-corrosion. Nano-silica has a large specific surface area and surface activity, and can adsorb more methylbenzotriazole molecules, making it slowly release on the metal surface and prolonging the anti-corrosion time; from the comparison of the experimental data of Example 2 with Comparative Example 7, it can be found that activating nano-silica is more helpful for adsorbing methylbenzotriazole.

[0071] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed claims.

Claims

1. An anti-corrosion solvent-free coating, consisting of a first component and a second component, characterized in that: The first component is composed of the following components in parts by weight: 45-60 parts of polyol, 5-15 parts of functional additives, 30-45 parts of fillers, 10-15 parts of epoxy resin, 10-20 parts of thermosetting polyacrylate, and 0.5-3 parts of antiseptic additives; The second component comprises the following components in parts by weight: 26 to 58 parts of octahydro-4,7-methyl-1H-methylene diisocyanate prepolymer; The antiseptic auxiliary agent is nano silicon dioxide loaded with methylbenzotriazole.

2. The anti-corrosion solvent-free coating according to claim 1, characterized in that: The polyol includes one or more of polyester diol, polyether diol and polyether triol.

3. The anti-corrosion solvent-free coating according to claim 1, characterized in that: The functional additives include one or more of a dispersant, a defoamer, and a leveling agent.

4. The anti-corrosion solvent-free coating according to claim 3, characterized in that: The dispersant includes one or more of fatty acid, DY-9006 or metal soap dispersants; the defoamer is one or more of silicone defoamer, high carbon alcohol defoamer, polyether defoamer; the leveling agent is one or more of acrylic leveling agent, silicone leveling agent, fluorocarbon leveling agent.

5. The anti-corrosion solvent-free coating according to claim 1, characterized in that: The filler is one or more of bentonite, titanium dioxide and barium sulfate.

6. The anti-corrosion solvent-free coating according to claim 1, characterized in that: The epoxy resin is one or more of bisphenol A epoxy resin and bisphenol F epoxy resin.

7. The anti-corrosion solvent-free coating according to claim 1, characterized in that: The preparation method of the octahydro-4,7-methyl-1H-methylene diisocyanate prepolymer comprises the following steps: A. Dehydrate the polyol at 130-140 Pa and 110-120°C for 1-3 h to obtain dehydrated polyol; B. Mix the dehydrated polyol with octahydro-4,7-methyl-1H-methylene diisocyanate in a molar ratio of 1:2-4, and react at 200 r / min and 80°C for 2-3 h.

8. The anti-corrosion solvent-free coating according to claim 1, characterized in that: The preparation method of the antiseptic auxiliary comprises the following preparation steps: a. Place nano-silicon dioxide in a microwave oven, heat at a high temperature of 800W for 3 to 5 minutes, and cool to room temperature to obtain activated nano-silicon dioxide; b. Dissolve methylbenzotriazole in ethanol with a mass of 4 to 6 times that of methylbenzotriazole, add activated nano-silicon dioxide with a mass of 3 to 5 times that of methylbenzotriazole, perform ultrasonic vibration at 200W for 4 to 6 hours, filter, and dry to obtain the antiseptic additive.

9. The anti-corrosion solvent-free coating according to claim 8, characterized in that: The particle size of the nano silicon dioxide is 50 to 80 nm.

10. The method for preparing the anticorrosive solvent-free coating according to any one of claims 1 to 9, characterized in that: The method comprises the following preparation steps: mixing the first component and the second component according to a weight ratio, and filtering the mixed materials after uniform mixing to obtain the anti-corrosion solvent-free coating.