Aspartic acid polyurea primer-topcoat paint and preparation method thereof

Abstract

The invention relates to an asparaginic acid polyurea primer-topcoat paint which comprises a component A and a component B. The component A comprises the following components in parts by weight: 25-35 parts of asparaginic acid polyurea resin, 5-10 parts of adhesion promoting resin, 0.1-1.0 part of a silane coupling agent, 1.3-5 parts of an auxiliary agent, 50-61 parts of a pigment filler and 5-10 parts of an organic mixed solvent, and the total content of the components in the component A is 100 parts; the component B comprises 88-92 parts of isocyanate resin and 8-12 parts of an organic mixed solvent, and the total content of all the components in the component B is 100 parts; the weight ratio of the component A to the component B is any one of (3: 1)-(5: 1). The asparaginic acid polyurea primer-topcoat integrated paint has excellent adhesive force, drying property, leveling property, distinctness of image, covering power and corrosion resistance to sand blasting carbon steel plates, can achieve the effect of primer and topcoat, realizes ultralow VOC while guaranteeing construction stability and super weather resistance, and is not influenced by humid weather and environment temperature in construction conditions. The invention also comprises a preparation method of the asparaginic acid polyurea primer-topcoat paint.

Description

Technical Field

[0001] The present invention relates to the field of paint preparation, and in particular, to an ultra-low VOC aspartic acid polyurea primer-surface integrated paint suitable for the painting of construction machinery and a preparation method thereof. Background Art

[0002] At present, countries around the world are increasingly strict in controlling volatile organic compounds (VOCs) in various paint and chemical products. Traditional high-volatile organic compound (VOC) paints (construction VOC greater than 420 g / L) are beginning to be restricted from use by new national laws and regulations. The construction VOC of traditional solvent-based paints in the prior art is generally high (usually greater than 420 g / L), and most of the painting construction of large-scale mechanical equipment is carried out in outdoor environments. During the construction process, a large amount of volatile organic compounds (VOCs) will be generated, resulting in serious environmental pollution and great harm to human health.

[0003] Although the construction VOC of waterborne paint is relatively low compared with solvent-based paint, its construction standards do not match the painting environments of most machines. Especially when the construction environment temperature is low, waterborne paint must rely on baking conditions to meet the construction requirements. In addition, the existing painting construction technologies in the field of construction machinery generally require two painting processes of primer and topcoat, which not only have a high labor cost but also increase VOC emissions.

[0004] In view of this, there is an urgent need in the art to develop an ultra-low VOC solvent-based primer-surface integrated paint for decorative and protective purposes, which can reduce the topcoat process during construction, and only one process can achieve the effect of primer plus topcoat, greatly reducing labor, materials and VOC emissions, and can meet the needs of protective painting in the industrial field (light machinery and heavy machinery) without baking in environments such as cold, hot and rainy seasons, and solve the problems faced in the prior art field. Summary of the Invention

[0005] Based on the above facts, the object of the present invention is to provide an ultra-low VOC aspartic acid polyurea primer-surface integrated paint suitable for the painting of construction machinery. Under the synergistic action of aspartic acid polyurea resin and adhesion promoting resin, and in combination with silane coupling agent, pigment extender, and dispersant, it can achieve ultra-low VOC while ensuring hiding power, anti-corrosion performance, construction stability, and low-temperature curing. The coating film formed by this paint can meet the needs of continuous painting operations of users without baking.

[0006] The first aspect of the present invention provides an aspartic acid polyurea primer and surface all-in-one paint, which comprises component A and component B. Component A comprises 25-35 parts of aspartic acid polyurea resin, 5-10 parts of adhesion promoting resin, 0.1-1.0 parts of silane coupling agent, 1.3-5 parts of auxiliary additives, 50-61 parts of pigments and fillers, and 5-10 parts of organic mixed solvents by weight, and the total content of each component in component A is 100 parts; component B comprises 88-92 parts of isocyanate resin and 8-12 parts of organic mixed solvents, and the total content of each component in component B is 100 parts; the weight ratio of component A to component B is any ratio between 3:1-5:1.

[0007] Aspartic acid polyurea resin

[0008] In the present invention, the molecular weight of the aspartic acid polyurea resin is 600-1000.

[0009] In some preferred embodiments of the present invention, the aspartic acid polyurea resin is selected from the aspartic acid polyurea resin model F524 provided by Zhuhai Feiyang Company. This type of resin still has excellent cross-linking and curing effect at low temperature (0°C).

[0010] Adhesion promoting resin

[0011] In some embodiments of the present invention, the molecular weight of the adhesion-promoting resin is 8000-25000. Its excellent flexibility can greatly improve the shrinkage stress of the overall coating film, and improve the adhesion of the aspartic acid polyurea primer-top coat coating film to the metal substrate, providing long-term and stable adhesion of the coating film on metal substrates such as sandblasted carbon steel plates. Therefore, the aspartic acid polyurea primer-top coat described in the present invention only needs one coating to achieve the effect of two coatings of primer and top coat, which greatly reduces manpower, material resources and VOC emissions.

[0012] In some preferred embodiments of the present invention, the adhesion-promoting resin is a polyester-modified epoxy resin with a hyperbranched macromolecular structure, and its molecular chain contains multiple epoxy groups. After adding the adhesion-promoting resin, the primer-top paint film can have long-lasting and excellent adhesion on the substrate; more preferably, the polyester-modified epoxy resin is a solvent-free liquid resin.

[0013] It should be noted that in the present invention, the aspartic acid polyurea primer-sealer paint includes both aspartic acid polyurea resin and adhesion promoter resin, and there is a complementary effect between the two resins. The aspartic acid polyurea resin with an F524 type molecular weight can reduce the viscosity of the system, and at the same time, due to its better denseness during curing, it can provide better chemical resistance for the coating film; the addition of the adhesion promoter resin with a large molecular weight can enhance the flexibility of the coating film and the adhesion to the substrate. The combination of two resins with different molecular weights and different categories can make the coating film of the aspartic acid polyurea primer-sealer paint have obvious advantages in terms of drying property, leveling property, adhesion to the substrate, anti-corrosion property, decorative property, and reduction of VOC. The amino groups with ultra-fast reaction activity on the aspartic acid polyurea resin enable the component A of the aspartic acid polyurea primer-sealer paint to be quickly cured into a film after being mixed with component B at an ambient temperature of 0-50°C.

[0014] Silane coupling agent

[0015] In the present invention, the silane coupling agent is used as a surface treatment agent for pigments and fillers to improve the affinity and wettability with the base resin of the paint, and plays a key role in anti-corrosion properties such as salt spray resistance of the coating film. In addition, after the silane coupling agent and the adhesion promoter resin are compounded, the aspartic acid polyurea primer-sealer paint of the present invention can have excellent long-term adhesion to the sandblasted carbon steel plate.

[0016] In some embodiments of the present invention, the silane coupling agent is a silane coupling agent of the octyltriethoxysilane type. Specifically, the silane coupling agent is selected from the silane coupling agent with the model number Silquest A-137 provided by Momentive Performance Materials Inc.

[0017] Auxiliary additive

[0018] In some embodiments of the present invention, the auxiliary additives are selected from one or more of a dispersant, an antifoaming agent, and a leveling aid. By weight, the aspartic acid polyurea primer-sealer paint contains 1-4.7 parts of a dispersant, 0.2-1 part of an antifoaming agent, and 0.1-1 part of a leveling aid, and the total content of the above components is 1.3-5 parts.

[0019] In some preferred embodiments of the present invention, the dispersant is a polymer block copolymer containing a pigment affinity group or a vinyl polymer containing a pigment affinity group, which can promote the cooperation of different types of resins to form a coating film with good flexibility and rigidity at the same time. One end of it has good affinity with polar pigments, can quickly wet the pigment surface and produce a strong adsorption effect. At the same time, the organic group introduced at the other end, preferably a long-chain alkyl / aryl group, is like an anchor groove structure and has good compatibility with the molecular chain of the aspartic acid polyurea resin, thereby reducing the possibility of the paint system flocculating or aggregating again, making the paint system not delaminate for a long time, and having stable low viscosity and dispersibility, ensuring the hiding power and stability during the use of the one-coat primer-surfacer. Specifically, the dispersant is a pigment and filler derivative. More specifically, the dispersant is selected from the dispersants with model numbers BYK163 and BYK161 provided by BYK Company, and the dispersant with model number tego670 provided by Degussa.

[0020] In some preferred embodiments of the present invention, the defoamer is selected from one or more of the defoamers with model numbers BYK085 and BYK066N provided by BYK Company, and the defoamer with model number Borchi Gol 0011 provided by Milekem Company, which has a stable defoaming effect and does not cause abnormal conditions for recoating; the leveling agent is selected from one or more of the leveling agents with model numbers DISPARLON LHP-91 provided by Disperlon, EFKA-3777 provided by BASF, and BYK333 provided by BYK Company, and they all have excellent wetting and leveling effects on the substrate surface.

[0021] Pigment and filler

[0022] In some embodiments of the present invention, the pigment and filler include pigments and fillers. The pigments are selected from one or more of organic pigments and inorganic pigments, and the fillers are anti-rust fillers. The addition of anti-rust fillers can improve the shrinkage performance of the one-coat primer-surfacer coating film and the anti-corrosion performance of the substrate. In the specific implementation process, those skilled in the art can select the types of pigment and filler according to needs.

[0023] Organic mixed solvent

[0024] In the present invention, the organic mixed solvents in component A and component B are exactly the same.

[0025] In some embodiments of the present invention, the organic mixed solvent is a mixed solvent of methyl amyl ketone (MAK) and methyl pentyl propionate (PMP), with a flash point ≥ 61 °C, having excellent dissolution performance, capable of reducing the viscosity of the bottom and surface combined coating, making the coating system meet the standards of Class C substances and satisfy the requirements of ordinary transportation and handling. Preferably, the mass ratio of methyl amyl ketone (MAK) to methyl pentyl propionate (PMP) in the organic mixed solvent is any ratio between 1:1 and 1:10; more preferably, the mass ratio of methyl amyl ketone (MAK) to methyl pentyl propionate (PMP) in the organic mixed solvent is 1:4.

[0026] Specifically, the organic mixed solvent is a mixed solvent of methyl amyl ketone (MAK) and methyl pentyl propionate (PMP) provided by Eastman.

[0027] Isocyanate resin

[0028] In some embodiments of the present invention, the isocyanate resin is a low-viscosity aliphatic polyisocyanate resin containing hexamethylene diisocyanate (HDI).

[0029] Specifically, the isocyanate resin is selected from the Wannate HT-100 resin provided by Yantai Wanhua and the isocyanate resin of the model HI100 provided by BASF.

[0030] The second aspect of the present invention provides a method for preparing the aspartic acid polyurea bottom and surface combined paint described in the first aspect of the present invention, including the following steps:

[0031] (1) Prepare Component A:

[0032] S1: Mix the aspartic acid polyurea resin, adhesion promoting resin, silane coupling agent, auxiliary additives and organic mixed solvent, and stir at a speed of 400 - 600 rpm for 10 - 15 min;

[0033] S2: Continuously add pigments and fillers under stirring, and continue to stir at a speed of 400 - 600 rpm for 10 - 15 min;

[0034] S3: Grind and disperse the mixture obtained after stirring to a fineness of less than 30 μm to obtain Component A;

[0035] (2) Prepare Component B:

[0036] S1: Mix the isocyanate resin and organic mixed solvent in a stirring tank filled with nitrogen, and stir at a speed of 300 - 500 rpm for 15 - 20 min to obtain Component B;

[0037] (3) Before use, mix Component A and Component B in a certain ratio to obtain the aspartic polyurea primer and topcoat in one.

[0038] The beneficial effects of the present invention are as follows:

[0039] The present invention provides an ultra-low VOC aspartic polyurea primer and topcoat in one applicable to mechanical painting. Under the synergistic effect of aspartic polyurea resin and adhesion promoting resin, combined with components such as silane coupling agent, pigment extender, and dispersant, it has very excellent film drying property, leveling property, dispersion stability, and relatively low viscosity, and has excellent adhesion to sandblasted carbon steel plate. It can achieve ultra-low VOC while ensuring hiding power, anti-corrosion performance, construction stability, and low-temperature curing. The film formed by this paint can meet the needs of continuous painting operation of users without baking, can ensure that construction is not affected by temperature in the environment of 5 - 40 °C, and after storing for 30 days at 50 °C, the viscosity, fineness, and appearance of this paint system basically do not change. In particular, this primer and topcoat in one only needs one coating to achieve the performance and appearance effects of primer plus topcoat. Therefore, it has good application prospects in the painting of mechanical (light machinery and heavy machinery) fields. Specific embodiments

[0040] To illustrate the present invention more clearly, the present invention will be further described below in conjunction with specific examples and comparative examples. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not be used to limit the protection scope of the present invention. The experimental methods used in the following examples and comparative examples are all conventional methods unless otherwise specified, and the raw materials and reagents used are all products that can be purchased from conventional commercial channels unless otherwise specified.

[0041] The above technical solutions will be described below in conjunction with specific examples.

[0042] Examples 1 - 3: Aspartic polyurea primer and topcoat in one 1 - 3

[0043] Prepare the aspartic polyurea primer and topcoat in one 1 - 3 of the present invention according to the formula in Table 1 below. The preparation process is carried out according to the following steps:

[0044] (1) Prepare Component A:

[0045] S1: Mix aspartic polyurea resin, adhesion promoting resin, silane coupling agent, dispersant, defoaming agent, leveling aid, and organic mixed solvent, and stir at a speed of 400 - 600 rpm for 10 - 15 min;

[0046] S2: Continuously add pigment extender under stirring, and continue to stir at a speed of 400 - 600 rpm for 10 - 15 min;

[0047] S3: Grind and disperse the mixture obtained after stirring to a fineness of less than 30 μm to obtain the component A.

[0048] (2) Prepare component B:

[0049] S1: Stir the isocyanate resin and the organic mixed solvent in a stirring tank filled with nitrogen at a rotation speed of 300 - 500 rpm for 15 - 20 min to obtain the component B.

[0050] (3) Before use, mix component A and component B in proportion to obtain the aspartic polyurea primer - topcoat 1 - 3.

[0051] Comparative example 1: Primer - topcoat 1 as a comparative example

[0052] Prepare primer - topcoat 1 as a comparative example according to the formula in Table 1 below. The preparation process is as follows:

[0053] (1) Prepare component A:

[0054] S1: Mix the aspartic polyurea resin, adhesion - promoting resin, dispersant, defoamer, leveling agent and organic mixed solvent, and stir at a rotation speed of 400 - 600 rpm for 10 - 15 min;

[0055] S2: Continuously add pigments and fillers under stirring, and continue to stir at a rotation speed of 400 - 600 rpm for 10 - 15 min;

[0056] S3: Grind and disperse the mixture obtained after stirring to a fineness of less than 30 μm to obtain the component A.

[0057] (2) Prepare component B:

[0058] S1: Stir the isocyanate resin and the organic mixed solvent in a stirring tank filled with nitrogen at a rotation speed of 300 - 500 rpm for 15 - 20 min to obtain the component B;

[0059] (3) Before use, mix component A and component B in proportion to obtain primer - topcoat 1 as a comparative example.

[0060] It should be noted that primer - topcoat 1 as a comparative example in Comparative example 1 does not contain silane coupling agent and is not within the protection scope of the present invention, so it is Comparative example 1. The primer - topcoat without adding silane coupling agent has poor salt - spray corrosion resistance and is prone to abnormal foaming.

[0061] Comparative example 2: Primer - topcoat 2 as a comparative example

[0062] Prepare the primer - topcoat 2 as a comparative example according to the formula in Table 1 below. The preparation process is as follows:

[0063] (1) Preparation of Component A:

[0064] S1: Mix hydroxy acrylic resin, dispersant, defoamer, leveling agent and ester - ketone mixed solvent, and stir at a speed of 400 - 600 rpm for 10 - 15 min;

[0065] S2: Continuously add pigment - filler under stirring, and continue to stir at a speed of 400 - 600 rpm for 10 - 15 min;

[0066] S3: Grind and disperse the mixture obtained after stirring to a fineness of less than 30 μm to obtain Component A.

[0067] (2) Preparation of Component B:

[0068] S1: In a stirring tank filled with nitrogen, mix isocyanate resin and ester - ketone mixed solvent, and stir at a speed of 300 - 500 rpm for 15 - 20 min to obtain Component B;

[0069] (3) Before use, mix Component A and Component B in proportion to obtain the one - coat primer - sealer 2 as the comparative example.

[0070] It should be noted that the one - coat primer - sealer 2 as the comparative example in Comparative Example 2 is a conventional solvent - based one - coat primer - sealer, which does not contain components such as aspartic polyurea resin and adhesion - promoting resin, and is not within the protection scope of the present invention, so it is Comparative Example 2. The solid content of this conventional solvent - based one - coat primer - sealer is relatively low, and the VOC is high, and baking is required during actual construction to meet the drying standard.

[0071] Comparative Example 3: One - coat primer - sealer 3 as the comparative example

[0072] Prepare the one - coat primer - sealer 3 as the comparative example according to the formula in Table 1 below, and the preparation process is the same as that of Examples 1 - 3.

[0073] It should be noted that in the one - coat primer - sealer 3 as the comparative example in Comparative Example 3, calculated by weight, the dosage of silane coupling agent is less than 0.1 part, which is not within the protection scope of the present invention, so it is Comparative Example 3. Too little dosage of silane coupling agent will lead to poor salt - spray resistance and fail to achieve the protection function for the substrate.

[0074] Comparative Example 4: One - coat primer - sealer 4 as the comparative example

[0075] Prepare the one - coat primer - sealer 4 as the comparative example according to the formula in Table 1 below, and the preparation process is the same as that of Examples 1 - 3.

[0076] It should be noted that the bottom surface combined paint 4 in Comparative Example 4 uses a conventional bisphenol A epoxy resin as the adhesion promoting resin, and the dosage of the silane coupling agent is greater than 1 part by weight. It is not within the protection scope of the present invention, so it is Comparative Example 4. Using a conventional bisphenol A epoxy resin as the adhesion promoting resin will result in a short pot life after the paint and the curing agent are mixed, and the construction performance is very poor.

[0077] Comparative Example 5: Bottom surface combined paint 5 as a comparative example

[0078] Prepare the bottom surface combined paint 5 as a comparative example according to the formula in Table 1 below. The preparation process is as follows:

[0079] (1) Prepare Component A:

[0080] S1: Mix the aspartic acid polyurea resin, adhesion promoting resin, dispersant, defoamer, leveling agent and organic mixed solvent, and stir at a speed of 400 - 600 rpm for 10 - 15 min;

[0081] S2: Continuously add the pigment and filler under stirring, and continue to stir at a speed of 400 - 600 rpm for 10 - 15 min;

[0082] S3: Grind and disperse the mixture obtained after stirring to a fineness of less than 30 μm to obtain Component A.

[0083] (2) Prepare Component B:

[0084] S1: In a stirring tank filled with nitrogen, stir the isocyanate resin and the organic mixed solvent at a speed of 300 - 500 rpm for 15 - 20 min to obtain Component B.

[0085] (3) Before use, mix Component A and Component B in proportion to obtain the bottom surface combined paint 5 as a comparative example.

[0086] It should be noted that the bottom surface combined paint 5 in Comparative Example 5 does not contain a silane coupling agent, and the dosage of the adhesion promoting resin is less than 5 parts. It is not within the protection scope of the present invention, so it is Comparative Example 5. The bottom surface combined paint lacking a silane coupling agent and having too little adhesion promoting resin has poor salt spray resistance, and the coating film is very easy to have abnormal blistering.

[0087] Comparative Example 6: Bottom surface combined paint 6 as a comparative example

[0088] Prepare the bottom surface combined paint 6 as a comparative example according to the formula in Table 1 below. The preparation process is as follows:

[0089] (1) Prepare Component A:

[0090] S1: Mix aspartic acid polyurea resin, silane coupling agent, dispersant, defoamer, leveling agent and organic mixed solvent, and stir at a rotation speed of 400 - 600 rpm for 10 - 15 min;

[0091] S2: Continuously add pigments and fillers under stirring, and continue to stir at a rotation speed of 400 - 600 rpm for 10 - 15 min;

[0092] S3: Grind and disperse the mixture obtained after stirring to a fineness of less than 30 μm to obtain the component A.

[0093] (2) Prepare component B:

[0094] S1: Place isocyanate resin and organic mixed solvent in a stirring tank filled with nitrogen, and stir at a rotation speed of 300 - 500 rpm for 15 - 20 min to obtain the component B.

[0095] (3) Before use, mix component A and component B in proportion to obtain the primer - topcoat in one 6 as the comparative example.

[0096] It should be noted that the primer - topcoat in one 6 in the comparative example 6 does not contain adhesion - promoting resin and is not within the protection scope of the present invention, so it is the comparative example 6. The lack of adhesion - promoting resin will cause a large shrinkage rate during the curing process of the coating film, resulting in a lack of long - term adhesion.

[0097] Comparative example 7: Primer - topcoat in one 7 as the comparative example

[0098] Prepare the primer - topcoat in one 7 as the comparative example according to the formula in Table 1 below, and the preparation process is the same as that in Examples 1 - 3.

[0099] It should be noted that in the primer - topcoat in one 7 in the comparative example 7, calculated by weight, the dosage of adhesion - promoting resin is greater than 10 parts, and the dosage of pigments and fillers is less than 50 parts. It is not within the protection scope of the present invention, so it is the comparative example 7. Excessive dosage of adhesion - promoting resin will cause a decrease in hardness and poor salt - spray resistance.

[0100] Comparative example 8: Primer - topcoat in one 8 as the comparative example

[0101] Prepare the primer - topcoat in one 8 as the comparative example according to the formula in Table 1 below, and the preparation process is the same as that in Examples 1 - 3.

[0102] It should be noted that in the bottom surface unifying paint 8 as a comparative example in Comparative Example 8, based on parts by weight, the dosage of the adhesion promoting resin is less than 5 parts, the dosage of the silane coupling agent is greater than 1 part, and the dosage of the organic mixed solvent is less than 5 parts. It is not within the protection scope of the present invention, so it is Comparative Example 8. Excessive dosage of the silane coupling agent will lead to poor recoatability of the coating film and poor interlayer adhesion.

[0103] Table 1 Raw material components of the aspartic acid polyurea bottom surface unifying paint in Examples 1-3 and the bottom surface unifying paint in Comparative Examples 1-8

[0104]

[0105]

[0106] The aspartic acid polyurea bottom surface unifying paints 1-3 obtained in Examples 1-3 and the bottom surface unifying paints obtained in Comparative Examples 1-8 were respectively tested, and the relevant parameters obtained are shown in Table 2.

[0107] Table 2 Detection parameters of the aspartic acid polyurea bottom surface unifying paint in Examples 1-3 and the bottom surface unifying paint in Comparative Examples 1-8

[0108]

[0109]

[0110] As can be seen from the data in Table 2, for the aspartic acid polyurea bottom surface unifying paints in Examples 1-3 and Comparative Examples 1, 3, 4, 5, 6, 7, and 8 of the present invention, the fineness, solid content, and viscosity can all meet the requirements, and the VOC is relatively low, which is 100 g / L lower than the standard of 250 g / L. While for the conventional solvent-based bottom surface unifying paint in Comparative Example 2, the solid content is relatively low and the VOC is relatively high, which is 100 g / L higher than the standard of 250 g / L. Therefore, the aspartic acid polyurea bottom surface unifying paint described in the present invention has a much lower VOC content than the conventional solvent-based bottom surface unifying paint.

[0111] The aspartic acid polyurea bottom surface unifying paints 1-3 obtained in Examples 1-3 and the bottom surface unifying paints obtained in Comparative Examples 1-8 were subjected to performance tests, and some process parameters during construction and the performance of the formed paint films were compared. The results are shown in Table 3.

[0112] Table 3 Performance tests of the aspartic acid polyurea bottom surface unifying paint in Examples 1-3 and the bottom surface unifying paint in Comparative Examples 1-8

[0113]

[0114]

[0115]

[0116] As can be seen from the results in Table 3, the physical and chemical properties of the film formed by the aspartic acid polyurea primer-sealer paint provided by the present invention meet the requirements, and at the same time, the construction VOC is lower than 250 g / L. By comparing the examples with Comparative Examples 1, 3, 4, 5, 6, 7, and 8, it can be found that the primer-sealer paints with the silane coupling agent and the adhesion promoter resin compounded outside the designed addition range have poor adhesion to the sandblasted carbon steel plate or poor recoatability, which reflects the excellent long-term adhesion of the aspartic acid polyurea primer-sealer paint to the sandblasted carbon steel plate described in the present invention. At the same time, the addition of the silane coupling agent also significantly helps with salt spray corrosion resistance, ensuring the anti-corrosion effect of the primer. The construction VOC of the conventional solvent-based primer-sealer paint in Comparative Example 2 is 363 g / L, which is much greater than the standard of 250 g / L, and the construction solid content is relatively low, and baking is required during actual construction to meet the drying standard.

[0117] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, based on the above description, other different forms of changes or variations can be made. It is impossible to list all the implementation manners here. Any obvious changes or variations derived from the technical solutions of the present invention still fall within the protection scope of the present invention.

Claims

1. An aspartic acid polyurea primer and topcoat, characterized in that: The aspartic acid polyurea primer and topcoat comprises component A and component B, in parts by weight, wherein: The component A comprises 25-35 parts of aspartic acid polyurea resin, 5-10 parts of adhesion promoting resin, 0.1-1.0 parts of silane coupling agent, 1.3-5 parts of auxiliary additives, 50-61 parts of pigments and fillers, and 5-10 parts of organic mixed solvents, wherein the total content of each component in the component A is 100 parts; The B component includes 88-92 parts of isocyanate resin and 8-12 parts of organic mixed solvent, wherein the total content of each component in the B component is 100 parts; The weight ratio of the component A to the component B is any ratio between 3:1 and 5:

1.

2. The aspartic acid polyurea primer and topcoat according to claim 1, characterized in that: The molecular weight of the aspartic acid polyurea resin is 600-1000; preferably, the aspartic acid polyurea resin is selected from the aspartic acid polyurea resin model F524 provided by Zhuhai Feiyang Company.

3. The aspartic acid polyurea primer-top all-in-one paint according to claim 1, characterized in that: The molecular weight of the adhesion-promoting resin is 8000-25000; preferably, the adhesion-promoting resin is a polyester-modified epoxy resin with a hyperbranched macromolecular structure, and its molecular chain contains multiple epoxy groups; more preferably, the polyester-modified epoxy resin is a solvent-free liquid resin.

4. The aspartic acid polyurea primer-top paint according to claim 1, characterized in that: The silane coupling agent is an octyltriethoxysilane type silane coupling agent; preferably, the silane coupling agent is selected from the silane coupling agent model Silquest A-137 provided by Momentive Corporation.

5. The aspartic acid polyurea primer-top paint according to claim 1, characterized in that: The auxiliary additive is selected from one or more of a dispersant, a defoamer, and a leveling agent. By weight, the aspartic acid polyurea primer and surface all-in-one paint contains 1-4.7 parts of a dispersant, 0.2-1 parts of a defoamer, and 0.1-1 parts of a leveling agent, and the total content of the above components is 1.3-5 parts.

6. The aspartic acid polyurea primer-top paint according to claim 5, characterized in that: The dispersant is a high molecular block copolymer containing pigment affinity groups or a vinyl polymer containing pigment affinity groups; preferably, the dispersant is selected from one or more of the dispersants of model BYK163 and BYK161 provided by BYK and model tego670 provided by Tego; the defoamer is selected from one or more of the defoamers of model BYK085 and BYK066N provided by BYK and model BorchiGol 0011 provided by Merican; the leveling aid is selected from one or more of the leveling aids of model DISPARLON LHP-91 provided by DISPARLON, model EFKA-3777 provided by BASF and model BYK333 provided by BYK.

7. The aspartic acid polyurea primer-top paint according to claim 1, characterized in that: The color filler comprises a pigment and a filler, wherein the pigment is selected from one or more of an organic pigment and an inorganic pigment, and the filler is an anti-rust filler.

8. The aspartic acid polyurea primer-top paint according to claim 1, characterized in that: The organic mixed solvent is a mixed solvent of methyl amyl ketone and methenyl ester; preferably, the mass ratio of methyl amyl ketone and methenyl ester in the organic mixed solvent is any ratio between 1:1-1:10; more preferably, the mass ratio of methyl amyl ketone and methenyl ester in the organic mixed solvent is 1:

4.

9. The aspartic acid polyurea primer-top paint according to claim 1, characterized in that: The isocyanate resin is a low-viscosity aliphatic polyisocyanate resin containing hexamethylene diisocyanate; preferably, the isocyanate resin is selected from the isocyanate resin model Wannate HT-100 provided by Yantai Wanhua and the isocyanate resin model HI100 provided by BASF.

10. A method for preparing the aspartic acid polyurea primer-top coat according to any one of claims 1 to 9, characterized in that: The steps include: (1) Preparation of component A: S1: Mix aspartic acid polyurea resin, adhesion promoting resin, silane coupling agent, auxiliary additive and organic mixed solvent, and stir at a speed of 400-600 rpm for 10-15 minutes; S2: Continue to add pigments and fillers while stirring, and continue stirring at a speed of 400-600 rpm for 10-15 minutes; S3: grinding and dispersing the mixture obtained after stirring until the fineness is less than 30 μm, thereby obtaining the component A; (2) Preparation of component B: S1: Stir the isocyanate resin and the organic mixed solvent in a stirring tank filled with nitrogen at a speed of 300-500 rpm for 15-20 minutes to obtain the B component; (3) Before use, component A and component B are mixed in proportion to obtain the aspartic acid polyurea primer and topcoat.

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