Additive for optimizing performance of epoxy zinc-rich coating, epoxy zinc-rich coating and construction application method

Abstract

The invention discloses an additive for optimizing the performance of an epoxy zinc-rich coating, the epoxy zinc-rich coating and a construction application method.The additive system comprises a first additive, a second additive and a third additive; the additive I is an organic silicon modified reactive diluent, the chemical molecular structure of the additive I at least comprises hydrolyzable siloxane, a flexible chain segment and epoxy groups, the functionality of the siloxane is greater than or equal to 2, the number of the epoxy groups is greater than or equal to 1, and the additive II is organic silicon modified zinc powder; and the additive III is an aqueous solution of amine. Based on an additive system formed by three additives, the epoxy zinc-rich coating can be directly matched with a conventional epoxy zinc-rich coating for use, the performance of the conventional epoxy zinc-rich coating is optimized, and after re-optimization, the volume solid content of the epoxy zinc-rich coating can be increased to 80%, the mass solid content of the epoxy zinc-rich coating can be about 90%, and the mass ratio of VOC is smaller than 10%; and meanwhile, at low temperature, spraying construction can be performed without dilution, and the thickness of a dry film can reach 40-70 microns.

Description

Technical Field

[0001] The invention relates to the technical field of epoxy zinc-rich coatings, and in particular to an additive for optimizing the performance of epoxy zinc-rich coatings, the epoxy zinc-rich coatings and a construction application method. Background Art

[0002] In the anti-corrosion coating system of steel structure, the role of zinc-rich primer is very important. It must have good adhesion to steel and can play an excellent anti-rust role. Epoxy zinc-rich primer is one of the commonly used primers in my country's heavy anti-corrosion coating system. Its anti-corrosion effect is to protect steel in a corrosive environment by corroding sacrificial zinc powder.

[0003] The volume solid content of traditional epoxy zinc-rich primers is mostly between 65% and 77%, and its mass solid content is also relatively low. The VOC mass ratio is relatively high, and after painting, it often has relatively large VOC emissions, which has a greater impact on the environment.

[0004] For example, the invention patent with authorization announcement number CN113527982B discloses a solvent-free epoxy zinc-rich coating. The solvent-free epoxy zinc-rich coating uses modified E51 epoxy resin as a component, and preferably uses a specific water-based amine curing agent. The product can achieve extremely low VOCs content (less than 30g / L), solid content ≥97%, and can achieve faster drying under high humidity conditions (humidity greater than 85%), thereby broadening the scope of use of water-based coatings.

[0005] However, the formula and preparation process of the epoxy zinc-rich coating in the above scheme are quite different from the preparation process of the epoxy zinc-rich primer in the prior art, and the processing and preparation difficulty is relatively high. It is impossible to directly optimize the performance of the epoxy zinc-rich primer in the prior art by means of additives. Summary of the invention

[0006] The object of the present invention is to provide an additive for optimizing the performance of epoxy zinc-rich coating, epoxy zinc-rich coating and a construction application method, so as to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] An additive system for optimizing the performance of epoxy zinc-rich coatings, comprising additive one, additive two and additive three; wherein the mass of additive two: the sum of the mass of additive one and additive two is 0.65-0.85:1, the mass ratio of additive three: the mass ratio of additive one is 0.0624-0.0627:1, and the volume solid content of additive one, additive two and additive three after mixing is greater than 97.8%;

[0009] The first additive is an organosilicon-modified reactive diluent, whose chemical molecular structure at least comprises hydrolyzable siloxane, a flexible chain segment and an epoxy group, wherein the siloxane functionality is ≥2, the number of epoxy groups is ≥1, and the viscosity of the organosilicon-modified reactive diluent is below 50cp;

[0010] The second additive is organosilicon-modified zinc powder; the third additive is an aqueous solution of amine with a concentration of 3-5%.

[0011] As a further embodiment of the present invention, the organosilicon-modified reactive diluent comprises a first epoxy silane and a second epoxy silane, wherein the first epoxy silane comprises one, two or more of 3-glycidyloxypentyltrimethoxysilane, 3-glycidylepoxypentylmethyldimethoxysilane and 3-glycidylepoxypentyldimethoxyoxysilane;

[0012] The second epoxy silane includes one, two or more of 3-glycidyloxypentyltriethoxysilane, 3-glycidyloxypentylmethyldiethoxysilane, 3-glycidylepoxypentyldiethoxysilane and 3-glycidyloxypentyldiethylethoxysilane.

[0013] As a further solution of the present invention, the organosilicon-modified zinc powder is obtained by surface modification treatment of a preferred zinc powder, wherein the preferred zinc powder is a primary or secondary zinc powder that meets GB / T 6890-2012, wherein the metal zinc content in the preferred zinc powder is above 94%, and the particle size of the preferred zinc powder is 500 mesh to 800 mesh. The preparation method of the organosilicon-modified zinc powder is:

[0014] Preferably, the zinc powder is heated to 20-50° C. under stirring, silane is gradually added dropwise, and stirred for 1 hour to obtain organosilicon-modified zinc powder, wherein the amount of silane added is 0.1-5% of the mass of the zinc powder.

[0015] As a further embodiment of the present invention, the silane includes one, two or more of methylsilane, ethylsilane and pentylsilane.

[0016] As a further embodiment of the present invention, the aqueous solution of amines comprises one, two or more of aqueous ammonia solution, morpholine solution, diethylenetriamine solution and triethylenetetramine solution.

[0017] An epoxy zinc-rich coating comprises an additive system for optimizing the performance of the epoxy zinc-rich coating, and also comprises an epoxy zinc-rich base material, wherein the epoxy zinc-rich base material comprises component A and component B, and the volume solid content of the epoxy zinc-rich base material is greater than or equal to 65%, and the component A comprises the following ingredients:

[0018] Epoxy resin: 6-10 parts;

[0019] Solvent: 4-10 parts;

[0020] Thixotropic agent: 0.4-0.7 parts;

[0021] Zinc powder: 70-85 parts;

[0022] Other powders: 2 to 6 parts; other powders are one, two or more of talcum powder, mica powder, dolomite powder and barium sulfate;

[0023] The component B comprises the following ingredients:

[0024] Amine curing agent: 3-6 parts; the amine curing agent is one, two or more of polymerized amine, polyamide, and modified cardamom aldehyde amine;

[0025] Solvent: 2-4 parts;

[0026] The mass ratio of component A to component B is 100:5-10, the difference between the mass fraction of additive 2 in the additive system and the mass fraction of zinc powder in the epoxy zinc-rich base material is ±1%, and the volume solid content of the epoxy zinc-rich base material and the additive system after mixing is greater than 80%.

[0027] As a further solution of the present invention, the zinc powder in component A is primary or secondary zinc powder that meets GB / T 6890-2012, has a metal zinc content of more than 94%, and a particle size of 500 mesh to 800 mesh.

[0028] As a further solution of the present invention, the epoxy resin is one, two or more of bisphenol A series resin, bisphenol F series resin, phenolic epoxy series resin, and silicone modified low-branched epoxy resin, and the viscosity of the epoxy resin is below 50cp.

[0029] As a further embodiment of the present invention, the thixotropic agent is one, two or more of bentonite, silica and polyamide wax; the solvent is one, two or more of xylene, trimethylbenzene, n-butanol and propylene glycol methyl ether.

[0030] A construction and application method of epoxy zinc-rich coating comprises the following steps:

[0031] S1. According to the volume solid content of the epoxy zinc-rich base material, calculate and weigh the weight of the corresponding additives 1, 2 and 3, so that the volume solid content of the epoxy zinc-rich base material and the additive system after mixing is greater than 80%;

[0032] S2, preliminarily stir component A for one minute, then pour additive 1 into component A and stir thoroughly;

[0033] S3, slowly pouring additive 2 into the mixed component A and additive 1 system, stirring while pouring, and stirring for two minutes, with the stirring speed controlled at more than 300 rpm, so that the organosilicon-modified zinc powder is more easily dispersed in the system;

[0034] S4. Add additive 3 to the mixed system above, and continue stirring for 2-5 minutes at a stirring speed of 300 rpm. The system temperature is above 30°C, and stirring is continued for a long time until the water is fully dispersed in the system, making it easier to undergo hydrolysis and condensation reaction with the silicone resin therein;

[0035] S5, after the above steps S1 to S4, the mixed system reaches above 30°C, and is kept warm for 30 minutes, and then the operation is carried out according to step S6; if the ambient temperature of the construction is lower than 15°C, it is difficult for the mixed system to reach 30°C in a short time, and the stirred mixed system needs to be covered and sealed, and placed in a 50°C water bath, so that the system temperature is maintained at 45-50°C for at least 10 minutes to accelerate the silane hydrolysis condensation reaction;

[0036] S6. Take out the mixed system and cool it naturally to below 40°C. Finally, pour component B into the system, mix and stir. Control the stirring speed at 200-300 rpm. Continue stirring for one minute and it is ready for use. The stirred paint needs to be used up within 0.5 hours.

[0037] Compared with the prior art, the beneficial effects of the present invention are as follows: the additive system composed of three additives (additive one, additive two and additive three) can be directly used in conjunction with conventional epoxy zinc-rich coatings to optimize the performance of conventional epoxy zinc-rich coatings. After further optimization, the volume solid content of the epoxy zinc-rich coating can be increased to 80%, the mass solid content is about 90%, and the VOC mass proportion will be less than 10%; at the same time, at low temperatures (such as 5°C), spraying construction is possible without dilution, and the dry film thickness can reach 40-70um. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a chemical structure diagram of additive 1 in the present invention;

[0039] Figure 2 is the synthesis reaction equation of γ-(2,3-epoxypropoxy)pentyltrimethoxysilane in the present invention;

[0040] Figure 3 is the chemical reaction formula of the amine-catalyzed silane hydrolysis and condensation reaction mechanism in the present invention;

[0041] Figure 4 This is a schematic diagram of the specific spraying operation of epoxy zinc-rich paint. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] An additive system for optimizing the performance of epoxy zinc-rich coatings, comprising additive one, additive two and additive three; wherein the mass of additive two: the sum of the mass of additive one and additive two is 0.65-0.85:1, the mass ratio of additive three: the mass ratio of additive one is 0.0624-0.0627:1, and the volume solid content of additive one, additive two and additive three after mixing is greater than 97.8%;

[0044] The additive one is an organosilicon-modified active diluent, which is a modified siloxane and its intermediates, and its chemical molecular structure at least comprises hydrolyzable siloxane, a flexible segment and an epoxy group, wherein the siloxane functionality is ≥2, the number of epoxy groups is ≥1, and the viscosity of the organosilicon-modified active diluent is below 50cp. As the most preferred solution, the viscosity of the organosilicon-modified active diluent is below 10cp; the additive one can further reduce the viscosity of the epoxy zinc-rich coating and improve the construction performance of the solid zinc-rich coating. Even at low temperatures (such as 5°C), no additional diluent needs to be added, and the optimized epoxy zinc-rich coating can be sprayed normally, and the expected dry film thickness reaches 40-70um; at the same time, the additive one can further undergo a hydrolysis and condensation reaction to form a cross-linked film.

[0045] like Figure 1 The chemical structure diagram of additive 1 is shown, wherein n is the number of repeating units, which is an integer ranging from 3 to 10, preferably 5 to 8;

[0046] b is an integer ranging from 2 to 3;

[0047] R is a C1-12 alkyl group;

[0048] R a represents methyl or ethyl;

[0049] R1 is a modified organic group flexible segment, which may be a repeating unit containing one, two or more of alkyl, ether bond, unsaturated bond, aromatic group, and may also contain one, two or more of nitrogen, oxygen, chlorine, and sulfur.

[0050] The second additive is organosilicon-modified zinc powder; the third additive is an aqueous solution of amine with a concentration of 3-5%.

[0051] As a specific solution, the organosilicon-modified reactive diluent includes a first epoxy silane and a second epoxy silane, wherein the first epoxy silane includes one, two or more of 3-glycidyloxypentyltrimethoxysilane, 3-glycidylepoxypentylmethyldimethoxysilane and 3-glycidylepoxypentyldimethoxyoxysilane;

[0052] The second epoxy silane includes one, two or more of 3-glycidyloxypentyltriethoxysilane, 3-glycidyloxypentylmethyldiethoxysilane, 3-glycidylepoxypentyldiethoxysilane and 3-glycidyloxypentyldiethylethoxysilane.

[0053] The synthetic preparation method of the organosilicon modified active diluent is as follows:

[0054] Taking γ-(2,3-epoxypropoxy)pentyltrimethoxysilane (also known as 3-glycidyloxypentyltrimethoxysilane) as an example, it is prepared by the hydrosilylation reaction of trimethoxysilane and allyl glycidyl ether under the action of a catalyst. The specific operation process includes esterification, addition, distillation, etc. The reaction equation is as follows: Figure 2 shown.

[0055] As a specific solution, the organosilicon-modified zinc powder is obtained by surface modification of a preferred zinc powder, wherein the preferred zinc powder is a primary or secondary zinc powder that meets GB / T 6890-2012, wherein the metal zinc content in the preferred zinc powder is above 94%, and the particle size of the preferred zinc powder is 500 mesh to 800 mesh. The preparation method of the organosilicon-modified zinc powder is:

[0056] Preferably, the zinc powder is heated to 20-50° C. under stirring, and silane is gradually added dropwise and stirred for 1 hour to obtain the organosilicon-modified zinc powder, wherein the amount of silane added is 0.1-5% of the mass of the zinc powder. The silane may include one, two or more of methylsilane, ethylsilane and pentylsilane, and methylsilane is particularly preferred.

[0057] The organosilicon-modified zinc powder in the present invention has a lower oil absorption value and is easier to stir and mix during on-site construction; secondly, the surface of the organosilicon-modified zinc powder is coated with an organosilicon protective layer, which isolates air and moisture to a certain extent, and the zinc powder has high storage stability and is easy to store for a long time; compared with conventional zinc powder, the anti-corrosion performance is also further improved.

[0058] As a specific solution, the aqueous solution of amine includes one, two or more of ammonia solution, morpholine solution, diethylenetriamine solution and triethylenetetramine solution. In the present invention, the role of additive three is to promote the hydrolysis and condensation reaction of additive one, further improve the crosslinking density of the resin film, and greatly improve the strength and anti-corrosion performance of the entire coating. In theory, water is not a reactant and eventually evaporates into the air. Figure 3 The chemical reaction formula shown is the mechanism of amine-catalyzed silane hydrolysis and condensation reaction.

[0059] An epoxy zinc-rich coating comprises an additive system for optimizing the performance of the epoxy zinc-rich coating, and also comprises an epoxy zinc-rich base material, wherein the epoxy zinc-rich base material comprises component A and component B, and the volume solid content of the epoxy zinc-rich base material is greater than or equal to 65%, and the component A comprises the following ingredients:

[0060] Epoxy resin: 6-10 parts;

[0061] Solvent: 4-10 parts;

[0062] Thixotropic agent: 0.4-0.7 parts;

[0063] Zinc powder: 70-85 parts;

[0064] Other powders: 2 to 6 parts; other powders are one, two or more of talcum powder, mica powder, dolomite powder and barium sulfate;

[0065] The component B comprises the following ingredients:

[0066] Amine curing agent: 3-6 parts; the amine curing agent is one, two or more of polymerized amine, polyamide, and modified cardamom aldehyde amine;

[0067] Solvent: 2-4 parts;

[0068] The mass ratio of component A to component B is 100:5-10, the difference between the mass fraction of additive 2 in the additive system and the mass fraction of zinc powder in the epoxy zinc-rich base material is ±1%, and the volume solid content of the epoxy zinc-rich base material and the additive system after mixing is greater than 80%.

[0069] The zinc powder in component A is first-grade or second-grade zinc powder that meets GB / T 6890-2012, has a metal zinc content of more than 94%, and a particle size of 500 mesh to 800 mesh.

[0070] As a specific solution, the epoxy resin is one, two or more of bisphenol A series resin, bisphenol F series resin, novolac epoxy series resin, and organosilicon-modified low-branched epoxy resin, and the viscosity of the epoxy resin is below 50cp.

[0071] As a specific solution, the thixotropic agent is one, two or more of bentonite, silica and polyamide wax; the solvent is one, two or more of xylene, trimethylbenzene, n-butanol and propylene glycol methyl ether.

[0072] The basic information of all components and additives of the epoxy zinc-rich coating of the present invention is shown in Table 1.

[0073] Table 1:

[0074]

[0075] A construction and application method of epoxy zinc-rich coating comprises the following steps:

[0076] S1. According to the volume solid content of the epoxy zinc-rich base material, calculate and weigh the weight of the corresponding additives 1, 2 and 3, so that the volume solid content of the epoxy zinc-rich base material and the additive system after mixing is greater than 80%;

[0077] S2, preliminarily stir component A for one minute, then pour additive 1 into component A and stir thoroughly;

[0078] S3, slowly pouring additive 2 into the mixed component A and additive 1 system, stirring while pouring, and stirring for two minutes, with the stirring speed controlled at more than 300 rpm, so that the organosilicon-modified zinc powder is more easily dispersed in the system;

[0079] S4. Add additive 3 to the mixed system above, and continue stirring for 2-5 minutes at a stirring speed of 300 rpm. The system temperature is above 30°C, and stirring is continued for a long time until the water is fully dispersed in the system, making it easier to undergo hydrolysis and condensation reaction with the silicone resin therein;

[0080] S5, after the above steps S1 to S4, the mixed system reaches above 30°C, and is kept warm for 30 minutes, and then the operation is carried out according to step S6; if the ambient temperature of the construction is lower than 15°C, it is difficult for the mixed system to reach 30°C in a short time, and the stirred mixed system needs to be covered and sealed, and placed in a 50°C water bath, so that the system temperature is maintained at 45-50°C for at least 10 minutes to accelerate the silane hydrolysis condensation reaction;

[0081] S6. Take out the mixed system and cool it naturally to below 40°C. Finally, pour component B into the system, mix and stir. Control the stirring speed at 200-300 rpm. Continue stirring for one minute and it is ready for use. The stirred paint needs to be used up within 0.5 hours.

[0082] like Figure 4 As shown in the figure, the specific spraying method is: before painting, pre-coating should be carried out on the parts that are difficult to cover tightly with local spraying, that is, the welds, edges, various holes and parts with complex structures and difficult to spray should be painted with a paint brush. Pay special attention to not leaving pores or missing paint positions when brushing the pre-coating;

[0083] After the pre-coating is completed, a conventional airless spray pump (65:1) can be used. Commonly used spray pumps include the American GRACO high-pressure airless spray pump and the Yangtze River brand series spray pump of Chongqing Yangtze River Machinery Factory in China. Commonly used models include GPQ6C, GPQ9C, QPT6528K, etc. When spraying, hold the spray gun so that the spray beam is always perpendicular to the surface and keep a uniform distance of about 30-50cm from the surface to be painted. Each spray channel should overlap the previous spray channel by 50%. Less than 50% overlap will cause streaks on the surface of the last paint. After pulling the trigger, move the spray gun at a uniform speed, because the paint flows at a uniform speed. When the spray width overlaps by 50%, the paint film is evenly covered.

[0084] To ensure the dry film thickness and control construction losses, it is recommended to use the Changjiang 14-17 medium-sized nozzle with an air intake pressure of 3 kg. After the paint is dried and cured normally, the subsequent coating can be applied.

[0085] In the present invention, additive one, additive two and additive three form an additive system, and the specific addition amount and ratio thereof are set according to the zinc powder content in the epoxy zinc-rich base material and the solid content thereof.

[0086] In Examples 1 to 6, the zinc powder content of the epoxy zinc-rich base material (a mixture of component A and component B) is 85%, and the zinc powder content of the three additives as a whole can be set to 85±1%. After that, the zinc powder content of the epoxy zinc-rich base material and the three additives is still maintained at about 85%; the volume solid content of the additives as a whole is >98%, wherein the water will evaporate into the air. After the three additives are mixed with the epoxy zinc-rich base material, the volume solid content of the mixture can be further increased to 80%. The mass ratio of additive one, additive two, and additive three is specifically 15:85:0.94, and the additive mixing density is approximately: 3.71 kg / L.

[0087] As mentioned above, the volume solid content of the mixture of component A and component B in the epoxy zinc-rich base material is above 65%. According to different volume solid contents, in Examples 1 to 6, the addition ratios of additive 1, additive 2 and additive 3 are shown in Table 2 below.

[0088] Table 2:

[0089]

[0090] Taking the epoxy zinc-rich base material with 70% solid content by volume in Example 3 as an example, the volume of component A and component B is 10 liters in total. In order to make the final solid content of the system reach 80%, the total amount of additives required is 5 liters, and the total weight of additives is 18.55 kg, that is, 2.78 kg of additive 1, 15.77 kg of additive 2, and 0.17 kg of additive 3 are required.

[0091] In Examples 7 to 12, the zinc powder content of the epoxy zinc-rich base material (a mixture of component A and component B) is 75%, and the zinc powder content of the three additives as a whole can be set to 75±1%. After that, the epoxy zinc-rich base material is mixed with the three additives and still maintains a zinc powder content of about 75%; the volume solid content of the additives as a whole is >98%, wherein the water will evaporate into the air. After the three additives are mixed with the epoxy zinc-rich base material, the volume solid content of the mixture can be further increased to 80%. The mass ratio of additive one, additive two, and additive three is specifically 25:75:1.56, and the additive mixing density is approximately: 2.81 kg / L.

[0092] As mentioned above, the volume solid content of the mixture of component A and component B in the epoxy zinc-rich base material is above 65%. According to different volume solid contents, in Examples 7 to 12, the addition ratios of additive 1, additive 2 and additive 3 are shown in Table 3 below.

[0093] Table 3:

[0094]

[0095] Taking the epoxy zinc-rich base material with 70% solid content by volume in Example 9 as an example, the volume of component A and component B is 10 liters in total. In order to make the final solid content of the system reach 80%, the total amount of additives required is 5 liters, and the total weight of additives is 14.05 kg, that is, 3.51 kg of additive 1, 10.54 kg of additive 2, and 0.22 kg of additive 3 are required.

[0096] In Examples 13 to 18, the zinc powder content of the epoxy zinc-rich base material (a mixture of component A and component B) is 65%, and the zinc powder content of the three additives as a whole can be set to 65±1%. After that, the epoxy zinc-rich base material is mixed with the three additives and still maintains a zinc powder content of about 75%; the volume solid content of the additives as a whole is >97.8%, wherein the water will evaporate into the air. After the three additives are mixed with the epoxy zinc-rich base material, the volume solid content of the mixture can be further increased to 80%. The mass ratio of Additive 1, Additive 2, and Additive 3 is specifically 35:65:2.19, and the additive mixing density is approximately: 2.27 kg / L.

[0097] As mentioned above, the volume solid content of the mixture of component A and component B in the epoxy zinc-rich base material is above 65%. According to different volume solid contents, in Examples 13 to 18, the addition ratios of additive 1, additive 2 and additive 3 are shown in Table 4 below.

[0098] Table 4:

[0099]

[0100] Taking the epoxy zinc-rich base material with 70% solid content by volume in Example 15 as an example, the volume of component A and component B is 10 liters in total. In order to make the final solid content of the system reach 80%, the total amount of additives required is 5 liters, and the total weight of additives is 16 kilograms, that is, 3.2 kilograms of additive 1, 12.8 kilograms of additive 2, and 0.2 kilograms of additive 3 are required.

[0101] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. An additive system for optimizing the performance of epoxy zinc-rich coatings, characterized in that: including additive one, additive two and additive three; The mass ratio of additive 2 to the sum of the mass of additive 1 and additive 2 is 0.65-0.85:1, the mass ratio of additive 3 to additive 1 is 0.0624-0.0627:1, and the volume solid content of additive 1, additive 2 and additive 3 after mixing is greater than 97.8%; The first additive is an organosilicon-modified reactive diluent, whose chemical molecular structure at least comprises hydrolyzable siloxane, a flexible chain segment and an epoxy group, wherein the siloxane functionality is ≥2, the number of epoxy groups is ≥1, and the viscosity of the organosilicon-modified reactive diluent is below 50cp; The second additive is organosilicon-modified zinc powder; The additive three is an aqueous solution of amine with a concentration of 3-5%.

2. An additive system for optimizing the performance of epoxy zinc-rich coating according to claim 1, characterized in that: The organosilicon-modified reactive diluent comprises a first epoxy silane and a second epoxy silane, wherein the first epoxy silane comprises one, two or more of 3-glycidyloxypentyltrimethoxysilane, 3-glycidylepoxypentylmethyldimethoxysilane and 3-glycidylepoxypentyldimethoxyoxysilane; The second epoxy silane includes one, two or more of 3-glycidyloxypentyltriethoxysilane, 3-glycidyloxypentylmethyldiethoxysilane, 3-glycidylepoxypentyldiethoxysilane and 3-glycidyloxypentyldiethylethoxysilane.

3. An additive system for optimizing the performance of epoxy zinc-rich coating according to claim 1, characterized in that: The organosilicon-modified zinc powder is obtained by surface modification of a preferred zinc powder, wherein the preferred zinc powder is a primary or secondary zinc powder that meets GB / T 6890-2012, wherein the metal zinc content in the preferred zinc powder is above 94%, and the particle size of the preferred zinc powder is 500 mesh to 800 mesh. The preparation method of the organosilicon-modified zinc powder is as follows: Preferably, the zinc powder is heated to 20-50° C. under stirring, silane is gradually added dropwise, and stirred for 1 hour to obtain organosilicon-modified zinc powder, wherein the amount of silane added is 0.1-5% of the mass of the zinc powder.

4. An additive system for optimizing the performance of epoxy zinc-rich coating according to claim 3, characterized in that: The silane includes one, two or more of methylsilane, ethylsilane and pentylsilane.

5. An additive system for optimizing the performance of epoxy zinc-rich coating according to claim 1, characterized in that: The aqueous solution of amines includes one, two or more of aqueous ammonia solution, morpholine solution, diethylenetriamine solution and triethylenetetramine solution.

6. An epoxy zinc-rich coating, characterized in that: An additive system for optimizing the performance of an epoxy zinc-rich coating according to any one of claims 1 to 5, further comprising an epoxy zinc-rich base material, the epoxy zinc-rich base material comprising component A and component B, and the volume solid content of the epoxy zinc-rich base material is greater than or equal to 65%, and the component A comprises the following ingredients: Epoxy resin: 6-10 parts; Solvent: 4-10 parts; Thixotropic agent: 0.4-0.7 parts; Zinc powder: 70-85 parts; Other powders: 2 to 6 parts; other powders are one, two or more of talcum powder, mica powder, dolomite powder and barium sulfate; The component B comprises the following ingredients: Amine curing agent: 3-6 parts; the amine curing agent is one, two or more of polymerized amine, polyamide, and modified cardamom aldehyde amine; Solvent: 2-4 parts; The mass ratio of component A to component B is 100:5-10, the difference between the mass fraction of additive 2 in the additive system and the mass fraction of zinc powder in the epoxy zinc-rich base material is ±1%, and the volume solid content of the epoxy zinc-rich base material and the additive system after mixing is greater than 80%.

7. An epoxy zinc-rich paint according to claim 6, characterized in that: The zinc powder in component A is first-grade or second-grade zinc powder that meets GB / T 6890-2012, has a metal zinc content of more than 94%, and a particle size of 500 mesh to 800 mesh.

8. An epoxy zinc-rich paint according to claim 6, characterized in that: The epoxy resin is one, two or more of bisphenol A series resin, bisphenol F series resin, novolac epoxy series resin and organosilicon modified low-branched epoxy resin, and the viscosity of the epoxy resin is below 50cp.

9. An epoxy zinc-rich paint according to claim 6, characterized in that: The thixotropic agent is one, two or more of bentonite, gas silica and polyamide wax; The solvent is one, two or more of xylene, trimethylbenzene, n-butanol and propylene glycol methyl ether.

10. A construction and application method of epoxy zinc-rich coating, characterized in that: The steps include: S1. According to the volume solid content of the epoxy zinc-rich base material, calculate and weigh the weight of the corresponding additives 1, 2 and 3, so that the volume solid content of the epoxy zinc-rich base material and the additive system after mixing is greater than 80%; S2, preliminarily stir component A for one minute, then pour additive 1 into component A and stir thoroughly; S3, slowly pouring additive 2 into the mixed component A and additive 1 system, stirring while pouring, and stirring for two minutes, with the stirring speed controlled at more than 300 rpm, so that the organosilicon-modified zinc powder is more easily dispersed in the system; S4. Add additive 3 to the mixed system above, and continue stirring for 2-5 minutes at a stirring speed of 300 rpm. The system temperature is above 30°C, and stirring is continued for a long time until the water is fully dispersed in the system, making it easier to undergo hydrolysis and condensation reaction with the silicone resin therein; S5, after the above steps S1 to S4, the mixed system reaches above 30°C, and is kept warm for 30 minutes, and then the operation is carried out according to step S6; if the ambient temperature of the construction is lower than 15°C, it is difficult for the mixed system to reach 30°C in a short time, and the stirred mixed system needs to be covered and sealed, and placed in a 50°C water bath, so that the system temperature is maintained at 45-50°C for at least 10 minutes to accelerate the silane hydrolysis condensation reaction; S6. Take out the mixed system and cool it naturally to below 40°C. Finally, pour component B into the system, mix and stir. Control the stirring speed at 200-300 rpm. Continue stirring for one minute and it is ready for use. The stirred paint needs to be used up within 0.5 hours.

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