Organic-inorganic hybrid water-based metallic paint and preparation method thereof

Abstract

The invention belongs to the technical field of corrosion prevention, and particularly relates to preparation of organic-inorganic hybrid water-based metallic paint which comprises film forming matter, auxiliaries, anti-rust pigment and filler, the film forming matter comprises vinylidene chloride copolymer, water-based single-component epoxy resin and inorganic emulsion, the vinylidene chloride copolymer accounts for 25-40 parts by weight of the total formula amount, and the water-based single-component epoxy resin accounts for 25-40 parts by weight of the total formula amount. The water-based single-component epoxy resin accounts for 5-20 parts by weight of the total formula amount, and the inorganic emulsion accounts for 1-10 parts by weight of the total formula amount. The metallic paint is environment-friendly and simple to construct; the vinylidene chloride resin, the water-based single-component epoxy resin and the inorganic emulsion are used as film forming substances, so that the excellent barrier property of the vinylidene chloride resin is reserved, the good adhesive force of the epoxy resin to a metal base material is also achieved, and meanwhile, the durability and the mechanical property of a paint film are enhanced by using the inorganic emulsion.

Description

Technical Field

[0001] The invention belongs to the technical field of anti-corrosion, and in particular relates to the preparation of an organic-inorganic hybrid water-based metallic paint. Background Art

[0002] The chemical, electrochemical or physical reaction between metal and the environment in which it is located causes the deterioration and deterioration of metal, which is called metal corrosion. Corrosion is a very common phenomenon. From the point of view of thermodynamics, except for a very small number of precious metals (Au, Pt, etc.), the corrosion of general metals is a spontaneous process. People have realized that the metals used are rarely damaged by simple mechanical factors (such as tension, compression, impact, fatigue, fracture and wear, etc.) or other physical factors (such as heat energy, light energy, etc.). The damage of most metal materials is related to their corrosion factors. Therefore, the corrosion of metal materials has become an important issue that cannot be ignored today.

[0003] Inorganic emulsions use modified nano-silica as the main film-forming substance and can partially replace organic emulsions. They are gaining more and more attention due to their environmental protection, durability and excellent mechanical properties. When combined with organic coatings, they have good adhesion to the substrate, improve the durability of the organic coating, improve the storage stability of the coating, and reduce the VOCs content in the coating products.

[0004] Epoxy resin contains a large number of hydroxyl groups, which can produce strong adhesion with metal substrates. At the same time, the thermosetting resin after cross-linking of epoxy resin and curing agent has good corrosion resistance.

[0005] Water-based polyvinylidene chloride copolymer emulsion does not contain organic solvents. It is environmentally friendly and harmless to human body when used in water-based coatings. Water-based polyvinylidene chloride resins used in metal corrosion protection must have two basic properties: good barrier properties and strong adhesion. However, polyvinylidene chloride resins with high VDC content and good barrier properties have poor emulsion stability and film-forming properties, low adhesion to metals, and are easy to fall off.

[0006] Compared with water-based epoxy resin, due to the excellent barrier properties of PVDC, water-based PVDC coatings eliminate the use of zinc powder paint during construction, thereby reducing the cost of the entire coating.

[0007] Vinylidene chloride resin has good barrier properties, but poor adhesion to metal surfaces. Waterborne epoxy resin has good adhesion to metal substrates, but epoxy resins with strong corrosion resistance are generally two-component. In actual application, two-component coatings have high requirements for construction technology and equipment, which limits their application.

[0008] Patent document 1 provides a water-based paint and a preparation method and application thereof, wherein the water-based resin comprises 30 to 50 parts by weight of a water-based acrylic modified epoxy emulsion, 2 to 15 parts by weight of silica sol and 5 to 10 parts by weight of a polyvinylidene chloride emulsion. The film-forming material in the invention also uses a compound of water-based vinylidene chloride and epoxy resin, but the content of the vinylidene chloride emulsion is relatively small, and the epoxy resin is an acrylic modified emulsion and is the main component, and the content of the vinylidene chloride emulsion is relatively low, so it is impossible to achieve excellent barrier properties;

[0009] Patent document 2 discloses a water-based single-component rust-resistant steel structure primer and its preparation method and application. The film-forming substances used are high-solid water-based modified epoxy ester resin and water-based vinylidene chloride modified acrylic resin. The water-based vinylidene chloride modified acrylic resin used is mainly acrylic acid, and the water-based epoxy ester resin has a smaller molecular weight than the macromolecular water-based epoxy resin, and has relatively weaker anti-corrosion performance.

[0010] Currently, most vinylidene chloride metal protective paints use vinylidene chloride copolymers as film-forming substances or are compounded with a certain amount of acrylic resin. There is no water-based metal paint compounded with epoxy resin as a film-forming substance. The present invention uses polyvinylidene chloride emulsion, water-based single-component epoxy resin and inorganic emulsion as main film-forming substances to prepare a metal protective paint with high adhesion and no impact on high barrier properties.

[0011] Prior art literature

[0012] Patent Literature

[0013] Patent document 1: CN201710539364.0

[0014] Patent document 2: CN201710942453.X Summary of the invention

[0015] Technical problem to be solved by the invention

[0016] Pure polyvinylidene chloride emulsion has good barrier properties, but poor adhesion to metal substrates; waterborne epoxy resin has a large number of hydroxyl groups, which can produce strong adhesion with metal substrates, but it is mainly two-component, the construction is cumbersome, and the equipment requirements are high. The purpose of the present invention is to use polyvinylidene chloride resin, waterborne epoxy resin and inorganic emulsion as the main film-forming substances, complement the advantages of the three resins, and obtain a single-component waterborne metal protective paint with high adhesion and high barrier properties.

[0017] Methods used to solve technical problems

[0018] In view of the above problems, the present invention compounded vinylidene chloride resin, a single-component water-based epoxy resin and an inorganic emulsion to prepare an organic-inorganic hybrid water-based metallic paint.

[0019] According to one embodiment of the present invention, there is provided an organic-inorganic hybrid water-based metallic paint, which includes a film-forming substance, an additive, an anti-rust pigment, and a filler. The film-forming substance used is a vinylidene chloride copolymer and a water-based single-component epoxy resin, with 25-40 parts by weight of the vinylidene chloride copolymer, 5-20 parts by weight of the water-based single-component epoxy resin, and 1-10 parts of an inorganic emulsion.

[0020] In a preferred embodiment, the additives include thickeners, defoamers, deaerators, stabilizers, wetting agents, dispersants, color pastes, anti-flash rust additives, and film-forming additives.

[0021] In a preferred embodiment, the thickener is bentonite, and the amount is 0.1-0.5 parts by weight; the defoamer is one or more of BASF FoamasterMO 2134AC, Tego Foamex K3, BYK-032 of Germany, and EASYTECH DF-677 of Sangjing Chemical, and the amount is 0.1-0.5 parts by weight; the defoamer is polyether siloxane, and the amount is 0.1-1.5 parts by weight; the stabilizer is one or more of F87 and Dalian Tongren Dongsheng TR-WA, and the stabilizer is prepared into a 25% aqueous solution for use, and the amount of the stabilizer solution is 2-7 parts by weight; the wetting agent is Evonik Surfynol 104E, the dosage is 0.2-0.8 weight part; the dispersant is an anionic wetting dispersant of polyacrylate sodium salt series, the dosage is 0.3-1 weight part; the color paste is black paste, the fineness is less than 10μm, the carbon black concentration is 35%, the dosage is 1-3 weight parts; the anti-flash rust additive is 15% sodium nitrite solution, the dosage is 0.2-1 weight part; the film-forming additive is one or a combination of ethylene glycol butyl ether, alcohol ester 12, dipropylene glycol methyl ether, propylene glycol methyl ether, the dosage is 1-5 weight parts.

[0022] In a preferred embodiment, the defoaming agent is one or a combination of TEGO901W, TEGO902W, TEGO904W; the dispersant is TEGO715W, Dispersant-9100, Klein 6100, BASF Sokalan PA30;

[0023] In a preferred embodiment, an anti-rust pigment may be added to the metal paint formula. The anti-rust pigment is aluminum tripolyphosphate modified with zinc ions, and the amount used is 4-10 parts by weight.

[0024] In a preferred embodiment, the anti-rust pigment is K-white 105, APW-2

[0025] In a preferred embodiment, fillers may be added to the metal paint formula. The fillers are one or more of talcum powder, barium sulfate, mica, and kaolin, and the total amount is 8-25 parts by weight.

[0026] According to a second aspect of the present invention, there is provided a method for preparing the above-mentioned high-adhesion water-based vinylidene chloride metal paint, which comprises the following steps:

[0027] The first step is to add deionized water to the paint mixing tank, then slowly add the thickener bentonite while stirring, and disperse at high speed until it is completely dissolved;

[0028] The second step is to sequentially add defoamer, deaerator, stabilizer, wetting agent and dispersant to the bentonite solution under stirring, and disperse evenly at high speed;

[0029] The third step is to add anti-rust pigment, color paste and filler to the above solution under stirring, and disperse or sand grind at high speed to a fineness of less than 35 μm, and cool the slurry for standby use;

[0030] The fourth step is to pre-adjust the pH of the vinylidene chloride resin. After filtering the resin with a 200-mesh filter cloth, the pH is adjusted to 4 with ammonia water under slow stirring for later use.

[0031] Step 5: slowly add the resin prepared in step 4 into the one-component waterborne epoxy resin under stirring;

[0032] Step 6: slowly adding the inorganic emulsion into the mixed emulsion obtained in step 5 under stirring;

[0033] In the seventh step, under stirring conditions, slowly add the mixed resin in the sixth step to the slurry in the third step, and then add the anti-flash rust agent and film-forming aid, and stir evenly.

[0034] Beneficial Effects of the Invention

[0035] The selected resins are all water-based, and are single-component, environmentally friendly and easy to construct; the film-forming materials use vinyl chloride resin, water-based single-component epoxy resin and inorganic emulsion, which not only retains the excellent barrier properties of vinyl chloride resin but also has the good adhesion of epoxy resin to metal substrates. At the same time, the addition of inorganic emulsion improves the overall stability, heat resistance and mechanical properties of the coating.

[0036] Further features of the present invention will become apparent from the following description of exemplary embodiments. DETAILED DESCRIPTION

[0037] An embodiment of the present disclosure will be described in detail below, but the present disclosure is not limited thereto.

[0038] The prepared high-adhesion water-based vinylidene chloride metal paint uses film-forming substances such as vinylidene chloride copolymer, water-based single-component epoxy resin and inorganic emulsion. By selecting additives and pigments and fillers, a metal protective paint with both high barrier properties of vinylidene chloride and excellent adhesion of epoxy resin to metal substrates is prepared.

[0039] The preparation process is as follows:

[0040] The first step is to add the formulated amount of deionized water to the paint mixing tank, then slowly add the bentonite while stirring, dispersing at high speed until it is completely dissolved;

[0041] The second step is to sequentially add defoamer, deaerator, stabilizer, wetting agent and dispersant to the bentonite solution under stirring, and disperse evenly at high speed;

[0042] The third step is to add anti-rust pigment, color paste and filler to the above solution under stirring, and disperse or sand grind at high speed to a fineness of less than 35 μm, and cool the slurry for standby use;

[0043] The fourth step is to pre-adjust the pH of the vinylidene chloride resin. After filtering the resin with a 200-mesh filter cloth, the pH is adjusted to 4 with ammonia water under slow stirring for later use.

[0044] The fifth step is to weigh the single-component waterborne epoxy resin in the formula amount, and then slowly add the resin prepared in the fourth step into the waterborne epoxy resin under low-speed stirring;

[0045] Step 6: adding a weighed amount of inorganic emulsion to the mixed emulsion obtained in step 5;

[0046] In the sixth step, under low-speed stirring conditions, slowly add the mixed resin in the sixth step to the slurry in the third step, and then add the anti-flash rust agent and film-forming aid, and stir evenly at a low speed.

[0047] According to the above scheme, the specific process and process conditions are as follows:

[0048] An organic-inorganic hybrid water-based metallic paint, wherein the film-forming substance comprises three resins, a, b and c, wherein the water-based resin a is a vinylidene chloride copolymer, such as one or a combination of Haloflex 202 of DSM, Diofan P530 of Solvay, Aquaguard P107 of Valspar, Permax 801, Permax 803 and Permax 805 of Lubrizol, and the dosage is 25-40 parts by weight; the water-based resin b is a single-component epoxy resin emulsion, such as one or two of H-502-42W and H-505-42W of DIC of Japan, 4020 water-based epoxy resin dispersion and DP42 single-component water-based epoxy emulsion, and the dosage is 5-20 parts by weight; c is an inorganic emulsion, such as one or two of ZS-30, TUS-30 and MSE-2 of Zhejiang Yuda Chemical, and the dosage is 1-10 parts by weight;

[0049] The bentonite is a thickener, and the amount used is 0.1-0.5 parts by weight;

[0050] The defoamer is a mineral oil defoamer, such as BASF Foamaster MO 2134AC, Tego Foamex K3, BYK-032 from Germany BYK, EASYTECH DF-677 from Sangjing Chemical, etc., and the amount used is 0.1-0.5 parts by weight;

[0051] The defoaming agent is polyether siloxane, such as TEGO901W, TEGO902W, TEGO904W, and the amount used is 0.1-1.5 parts by weight;

[0052] The stabilizer is F87 and Dalian Tongren Dongsheng TR-WA, and the stabilizer is prepared into a 25% aqueous solution, and the amount of the stabilizer solution is 2-7 parts by weight;

[0053] The wetting agent is Evonik Surfynol 104E, an acetylenic diol Germini nonionic surfactant. Due to its special structure, the product has multiple functions such as wetting, defoaming, improving dispersibility, improving flow and leveling, and can effectively reduce surface tension, control foam, and stabilize consistency and viscosity. The dosage is 0.2-0.8 parts by weight;

[0054] The dispersant is an anionic wetting dispersant of the polyacrylic acid sodium salt series, such as TEGO715W, Dispersant-9100, Klein 6100, BASF Sokalan PA30, etc., with a dosage of 0.3-1 parts by weight;

[0055] The anti-rust pigment is aluminum tripolyphosphate modified with zinc ions, such as K-white 105, APW-2, etc., and the amount is 4-10 parts by weight;

[0056] The filler is one or more of talc, barium sulfate, mica, and kaolin, and the amount used is 8-25 parts by weight;

[0057] The color paste is black, fineness is less than 10 μm, carbon black concentration is 35%, and the dosage is 1-3 parts by weight;

[0058] The anti-flash rust additive is a 15% sodium nitrite solution, with an amount of 0.2-1 parts by weight;

[0059] The film-forming aid is one or two of ethylene glycol butyl ether, alcohol ester 12, dipropylene glycol methyl ether, propylene glycol methyl ether, etc., and the dosage is 1-5%.

[0060] Example

[0061] The present invention is described in more detail by way of examples, but the present invention is not limited to the following examples.

[0062] Example 1

[0063] An organic-inorganic hybrid water-based metallic paint comprises the following components: 18 parts of deionized water, 35 parts of vinylidene chloride copolymer Haloflex202, 10 parts of water-based one-component epoxy resin H-502-42W, 5 parts of inorganic emulsion MES-2, 0.2 parts of bentonite LT, 0.3 parts of BASF FoamasterMO 2134AC, 0.4 parts of Digo 901W, 5 parts of 25% TR-WA aqueous solution, 0.5 parts of Evonik Surfynol 104E, 0.6 parts of Digo 715W, 1.5 parts of black slurry, 15 parts of talc, 5 parts of K-White105, 0.7 parts of 15% sodium nitrite solution, and 3 parts of ethylene glycol butyl ether.

[0064] During the preparation, the bentonite is first dissolved and dispersed in deionized water, and then BASF Foamaster MO2134AC, Digo 901W, 25% TR-WA aqueous solution, Evonik Surfynol 104E, Digo 715W, homemade black slurry, talcum powder, K-White 105 are added, and dispersed at high speed until the fineness is less than 35 μm. The slurry is cooled and set aside. Then Haloflex 202 is filtered with a 200-mesh filter cloth, and the pH is adjusted to 4 with ammonia water. The pH-adjusted Haloflex 202 is added to H-502-42W under low-speed stirring, and MSE-2 is added to the above mixed resin. Then the three mixed resins are slowly added to the above slurry, and finally 15% sodium nitrite solution and ethylene glycol butyl ether are added, and the organic-inorganic hybrid water-based metallic paint is obtained by low-speed stirring and mixing.

[0065] Example 2

[0066] An organic-inorganic hybrid water-based metallic paint comprises the following components: 17 parts of deionized water, 35 parts of vinylidene chloride copolymer Permax805, 12 parts of 4020 water-based epoxy resin dispersion, 3 parts of inorganic emulsion TUS-30, 0.3 parts of bentonite LT, 0.4 parts of Digo Foamex K3, 0.3 parts of Digo 902W, 5.6 parts of 25% F-87 aqueous solution, 0.6 parts of Evonik Surfynol 104E, 0.8 parts of BASF Sokalan PA30, 2 parts of self-made black slurry, 13 parts of barium sulfate, 6 parts of K-White105, 0.5 parts of anti-flash rust agent 179, and 4 parts of alcohol ester twelve.

[0067] During preparation, first dissolve bentonite in deionized water, then add BASF Foamex K3, Digo 902W, 25% F-87 aqueous solution, Evonik Surfynol 104E, BASF Sokalan PA30, homemade black slurry, barium sulfate, K-White105, disperse at high speed to a fineness of <35μm, and cool the slurry for use. Then filter Permax805 with a 200-mesh filter cloth, adjust the pH to 4 with ammonia water, add the pH-adjusted Permax805 to 4020 under low-speed stirring, and add TUS-30 to the above mixed resin. Then slowly add the three mixed resins to the above slurry, and finally add 179 and alcohol ester twelve, stir and mix evenly at low speed to obtain a high-adhesion water-based vinylidene chloride metal paint.

[0068] Comparative Example 1

[0069] An organic-inorganic hybrid water-based metallic paint comprises the following components: 18 parts of deionized water, 50 parts of vinylidene chloride copolymer Haloflex 202, 0.2 parts of bentonite LT, 0.3 parts of BASF Foamaster MO 2134 AC, 0.4 parts of Digo 901W, 5 parts of 25% TR-WA aqueous solution, 0.5 parts of Evonik Surfynol 104E, 0.6 parts of Digo 715W, 1.5 parts of self-made black slurry, 15 parts of talc, 5 parts of K-White 105, 0.7 parts of 15% sodium nitrite solution, and 3 parts of ethylene glycol butyl ether.

[0070] During the preparation, the bentonite is first dissolved and dispersed in deionized water, and then BASF Foamaster MO2134AC, Digo 901W, 25% TR-WA aqueous solution, Evonik Surfynol 104E, Digo 715W, homemade black slurry, talcum powder, K-White 105 are added, and dispersed at high speed to a fineness of less than 35 μm. The slurry is cooled and set aside. Then Haloflex 202 is filtered with a 200-mesh filter cloth, and the pH is adjusted to 4 with ammonia water, and then the resin with the adjusted pH is slowly added to the above slurry, and finally 15% sodium nitrite solution and ethylene glycol butyl ether are added, and the mixture is stirred at a low speed to be evenly mixed to obtain a high-adhesion water-based vinylidene chloride metal paint.

[0071] Comparative Example 2

[0072] An organic-inorganic hybrid water-based metallic paint comprises the following components: 18 parts of deionized water, 40 parts of vinylidene chloride copolymer Haloflex202, 10 parts of water-based one-component epoxy resin H-502-42W, 0.2 parts of bentonite LT, 0.3 parts of BASF FoamasterMO 2134AC, 0.4 parts of Digo 901W, 5 parts of 25% TR-WA aqueous solution, 0.5 parts of Evonik Surfynol 104E, 0.6 parts of Digo 715W, 1.5 parts of black slurry, 15 parts of talc, 5 parts of K-White105, 0.7 parts of 15% sodium nitrite solution, and 3 parts of ethylene glycol butyl ether.

[0073] During the preparation, the bentonite is first dissolved and dispersed in deionized water, and then BASF Foamaster MO2134AC, Digo 901W, 25% TR-WA aqueous solution, Evonik Surfynol 104E, Digo 715W, homemade black slurry, talcum powder, K-White 105 are added, and dispersed at high speed to a fineness of less than 35 μm. The slurry is cooled and set aside. Then Haloflex 202 is filtered with a 200-mesh filter cloth, and the pH is adjusted to 4 with ammonia water. The pH-adjusted Haloflex 202 is added to H-502-42W under low-speed stirring, and then the mixed resin is slowly added to the above slurry, and finally 15% sodium nitrite solution and ethylene glycol butyl ether are added, and the organic-inorganic hybrid water-based metallic paint is obtained by low-speed stirring and mixing.

[0074] The performance test of the embodiment and the comparative example was carried out. The above metallic paint was sprayed on a polished cold-rolled steel plate with a dry film thickness of 30±3 μm. The performance test was carried out after curing at room temperature for 7 days. The specific performance test results are shown in the following table:

[0075] Table 1 Performance test results of organic-inorganic hybrid water-based metallic paint

[0076]

[0077]

[0078] From the comparison in Table 1, it can be seen that when the film thickness is about 30μm, the hardness of pure vinyl chloride metal paint is low, the drying speed is slow, and the adhesion does not meet the requirements. When vinyl chloride resin is used in combination with a one-component waterborne epoxy resin, the hardness of the paint film and the adhesion to the substrate are significantly improved, and the protective performance of the substrate is also improved. When vinyl chloride resin, a one-component waterborne epoxy resin and an inorganic emulsion are used in combination, not only can the adhesion meet the requirements, the paint film dries quickly, the hardness is high, and the excellent anti-corrosion performance of the three is complementary, so that the salt spray resistance performance is improved to more than 800h.

[0079] Industrial Applicability

[0080] The purpose of the present invention is to improve the adhesion of vinylidene chloride copolymer as a metal protective paint on the metal surface, and the prepared organic-inorganic hybrid water-based metal paint has the excellent barrier properties of vinylidene chloride, the good adhesion of epoxy resin to metal substrates, and the good mechanical properties of inorganic coatings. The paint can be dried at room temperature or baked at low temperature, and can be sprayed or brushed according to construction requirements. The dry film thickness is 30-50μm, and after curing, the salt spray resistance reaches more than 800h. Good mechanical properties: ① The impact resistance is a heavy hammer height of 50cm, and the coating has no damage regardless of forward or reverse impact; ② The adhesion test is carried out using the hundred grid method. Through the magnifying glass, the coating cut is smooth and does not fall off, and the adhesion is level 0; ③ The flexibility of the coating is tested using a cone bending resistance instrument, and the test result is ≤1mm. No curing agent is required, and it is directly sprayed on the steel structure substrate for 20-30min to reach surface dryness. The resin is suitable for anti-rust coating of various types of petroleum equipment, chemical equipment, power equipment, hydraulic equipment, fire-fighting equipment; large and medium-sized mechanical equipment such as railways, bridges, pipelines, automobile parts, cranes, excavators, machine tools, etc.; and other metal castings, forgings, etc.

[0081] This embodiment is only a preferred specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An organic-inorganic hybrid water-based metallic paint, characterized in that: The invention comprises film-forming substances, additives, anti-rust pigments and fillers. The film-forming substances used are vinylidene chloride copolymer, water-based single-component epoxy resin and inorganic emulsion. The amount of vinylidene chloride copolymer is 25-40 parts by weight, the amount of water-based single-component epoxy resin is 5-20 parts by weight and the amount of inorganic emulsion is 1-10 parts.

2. The organic-inorganic hybrid water-based metallic paint according to claim 1, characterized in that: Additives include thickeners, defoamers, deaerators, stabilizers, wetting agents, dispersants, color pastes, anti-flash rust additives, and film-forming additives.

3. The organic-inorganic hybrid water-based metallic paint according to claim 2, characterized in that: The thickener is bentonite, and the dosage is 0.1-0.5 parts by weight; the defoamer is one or more of BASF FoamasterMO 2134AC, Tego Foamex K3, BYK-032 of Germany, and EASYTECH DF-677 of Sangjing Chemical, and the dosage is 0.1-0.5 parts by weight; the defoamer is polyether siloxane, and the dosage is 0.1-1.5 parts by weight; the stabilizer is one or more of F87 and Dalian Tongren Dongsheng TR-WA, and the stabilizer is prepared into a 25% aqueous solution, and the dosage of the stabilizer solution is 2-7 parts by weight; the wetting agent is Evonik Surfynol104E, and the dosage is 0.2-0.8 parts by weight parts; the dispersant is an anionic wetting and dispersing agent of polyacrylic acid sodium salt series, and the dosage is 0.3-1 parts by weight; the color paste is a black paste with a fineness of <10μm and a carbon black concentration of 35%, and the dosage is 1-3 parts by weight; the anti-flash rust additive is a 15% sodium nitrite solution, and the dosage is 0.2-1 parts by weight; the film-forming additive is one or two of ethylene glycol butyl ether, alcohol ester 12, dipropylene glycol methyl ether, and propylene glycol methyl ether, and the dosage is 1-5 parts by weight.

4. The organic-inorganic hybrid water-based metallic paint according to claim 2, characterized in that: The defoaming agent is further specifically one or a combination of TEGO901W, TEGO902W, and TEGO904W; the dispersant is further specifically one or a combination of TEGO715W, Dispersant-9100, Klein 6100, and BASF Sokalan PA30.

5. The organic-inorganic hybrid water-based metallic paint according to claim 2, characterized in that: The anti-rust pigment is aluminum tripolyphosphate modified with zinc ions, and the dosage is 4-10 parts by weight.

6. The organic-inorganic hybrid water-based metallic paint according to claim 5, characterized in that: The anti-rust pigment is K-white 105 or APW-2.

7. The organic-inorganic hybrid water-based metallic paint according to claim 2, characterized in that: The metallic paint further comprises a filler, which is one or more of talcum powder, barium sulfate, mica and kaolin, and the amount of the filler is 8-25 parts by weight.

8. The method for preparing the organic-inorganic hybrid water-based metallic paint according to any one of claims 1 to 7, characterized in that: The following steps are involved: The first step is to add deionized water to the paint mixing tank, then add bentonite while stirring and disperse until it is completely dissolved; The second step is to add defoamer, deaerator, stabilizer, wetting agent and dispersant in the bentonite solution in a stirring state, and disperse them evenly; The third step is to add anti-rust pigment, color paste and filler to the above solution under stirring, and grind at high speed or sand to a fineness of less than 35 μm, and cool the slurry for use; The fourth step is to pre-adjust the pH of the vinylidene chloride resin. After filtering the resin with a 200-mesh filter cloth, the pH is adjusted to 4 with ammonia water under stirring for later use. Step 5: Add the resin prepared in step 4 into the one-component waterborne epoxy resin under stirring; Step 6: slowly adding the inorganic emulsion into the mixed resin in step 5; In the seventh step, under stirring conditions, the mixed resin in the sixth step is added to the slurry in the third step, and then the anti-flash rust agent and film-forming aid are added and stirred evenly.

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