Water-based fluorocarbon outdoor paint and preparation method thereof

Abstract

The invention belongs to the technical field of water-based fluorocarbon paint, and particularly relates to water-based fluorocarbon outdoor paint and a preparation method thereof. The water-based fluorocarbon outdoor paint is prepared from the following raw materials in percentage by weight: 65-75% of water-based fluorocarbon emulsion, 8-12% of SiO2 coated aluminum powder, 1.5-3% of a compound thickening agent, 2-4% of a zwitterionic orientation agent, 0.5-1% of a dispersing agent and the balance of deionized water, wherein the total weight percentage is 100%. Wherein the compound type thickening agent is prepared from an alkali swelling type thickening agent and an associated type thickening agent; the zwitter-ion orientation agent is an acrylate copolymer. Through reasonable matching of the SiO2 coated aluminum powder, the compound thickening agent and the zwitter-ion orientation agent-level dispersing agent, the corrosion resistance is improved while the adhesive force is guaranteed, coating microcracks are reduced, and excellent weather resistance is achieved; and the drying time is shortened to 20 min for surface drying and 8 h for hard drying, and the high-temperature-resistant paint has high constructability.

Description

Technical Field

[0001] The invention belongs to the technical field of water-based fluorocarbon paints, and in particular relates to a water-based fluorocarbon outdoor paint and a preparation method thereof. Background Art

[0002] Water-based fluorocarbon coatings have excellent durability, easy construction, cleaning, and long-term excellent gloss and color retention properties. They are suitable for ultra-durable decorative protective coatings on the exterior walls, roofs and various building materials of various buildings, which can greatly extend the service life of the buildings.

[0003] Prior art CN115403966B discloses a water-based fluorocarbon coating for pre-coated coils and a preparation method thereof, wherein the raw materials include W316H type water-based slurry, aluminum silver paste and functional additives, etc. The functional additives include aluminum powder orienting agents and alkali swelling thickeners of non-ionic modified ethylene-vinyl acetate copolymer wax emulsion. The water-based fluorocarbon coating prepared using this raw material formula has excellent adhesion and impact resistance, and has excellent effects when used on the surfaces of aluminum alloy plates, steel plates and copper plates. However, the silver aluminum paste is prone to sedimentation and stratification due to surface oxidation or poor compatibility with the water-based system, and the metallic gloss of the coating will be reduced when the aluminum powder agglomerates. In addition, the functional additives do not take into account shear thinning or thixotropy adjustment, and uneven leveling is prone to occur during high-speed spraying.

[0004] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0005] The object of the present invention is to provide a water-based fluorocarbon outdoor paint and a preparation method thereof, so as to solve the problems existing in the water-based fluorocarbon coating for pre-coated coiled materials in the background art.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A water-based fluorocarbon outdoor paint is prepared from the following raw materials in weight percentage: 65-75% of water-based fluorocarbon emulsion, 8-12% of SiO2-coated aluminum powder, 1.5-3% of compound thickener, 2-4% of zwitterionic directing agent, 0.5-1% of dispersant, 0.075-0.15% of defoaming agent, and deionized water supplemented to 100%; wherein the compound thickener is composed of an alkali swelling thickener and an associative thickener; and the zwitterionic directing agent is an acrylate copolymer.

[0008] More specifically, the aqueous fluorocarbon emulsion CF-801 is an aqueous one-component fluorocarbon emulsion; the alkali swelling thickener is Dow Aloxane ASE-60; the associative thickener is Dow Aloxane RM-120W; the zwitterionic directing agent is Carbomer SF-1 acrylate copolymer; the dispersant is BYK-190 wetting dispersant; and the defoaming agent is TEGO902W defoaming agent.

[0009] More specifically, the SiO2 coated aluminum powder is prepared by the following steps:

[0010] a. 1000 g of aluminum powder with a D50 of 15 μm was added to 500 mL of anhydrous ethanol, ultrasonically dispersed at 300 W and 40 kHz for 30 min, centrifuged at 3000 rpm for 10 min, and the precipitate was washed three times with deionized water and dried in vacuo at 60 ° C for 12 h to obtain pretreated aluminum powder;

[0011] b. Add 10 g of ethyl orthosilicate to 200 mL of anhydrous ethanol, stir at 500 rpm to dissolve, then add 300 mL of deionized water, and add ammonia water to adjust the pH value to 9.5 to form a transparent silica sol;

[0012] c. The pretreated aluminum powder was added to the silica sol, stirred at 40°C and 800rpm for 6h, centrifuged at 5000rpm for 15min, the precipitate was washed three times with anhydrous ethanol, dried in vacuum at 60°C for 12h, and passed through a 200-mesh sieve to obtain the SiO2-coated aluminum powder.

[0013] The present invention also provides a method for preparing the water-based fluorocarbon outdoor paint, comprising the following steps:

[0014] S1. Add the aqueous fluorocarbon emulsion, SiO2-coated aluminum powder, dispersant and deionized water into the dispersion kettle and stir at 1200rpm for 20min;

[0015] S2. Add alkali swelling thickener, stir at 600rpm for 10min; add associative thickener, stir at 600rpm for 15min; add zwitterionic directing agent, stir at 400rpm for 20min; add defoamer, stir at 300rpm for 10min;

[0016] S5. Filter through a 200-mesh filter to obtain the water-based fluorocarbon outdoor paint.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention improves corrosion resistance while ensuring adhesion through the reasonable combination of SiO2-coated aluminum powder, compound thickener, and zwitterionic directional agent-grade dispersant, reduces coating microcracks, and has excellent weather resistance; it is suitable for high-speed spraying, and the drying time is shortened to 20 minutes for surface drying and 8 hours for actual drying, and has high construction performance. Overall, the performance of water-based fluorocarbon outdoor paint is improved, and it can be applied to harsh outdoor environments such as marine climates and acid rain areas, and has good application prospects in the fields of building curtain walls and bridge steel structures. DETAILED DESCRIPTION

[0019] The following is a clear and complete description of the technical solution of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by technicians in this field without creative work are within the scope of protection of the present invention.

[0020] 1. Effect of different raw material formulas on the performance of water-based fluorocarbon outdoor paint

[0021] 1.1 The raw material formula of water-based fluorocarbon outdoor paint is shown in Table 1.

[0022] Table 1 Raw material formula of water-based fluorocarbon outdoor paint

[0023]

[0024] 1.2SiO2 coated aluminum powder

[0025] The SiO2 coated aluminum powder in Table 1 was prepared by the following steps:

[0026] a. 1000 g of aluminum powder with a D50 of 15 μm was added to 500 mL of anhydrous ethanol, ultrasonically dispersed at 300 W and 40 kHz for 30 min, centrifuged at 3000 rpm for 10 min, and the precipitate was washed three times with deionized water and dried in vacuo at 60 ° C for 12 h to obtain pretreated aluminum powder;

[0027] b. Add 10 g of ethyl orthosilicate to 200 mL of anhydrous ethanol, stir at 500 rpm to dissolve, then add 300 mL of deionized water, and add ammonia water to adjust the pH value to 9.5 to form a transparent silica sol;

[0028] c. The pretreated aluminum powder was added to the silica sol, stirred at 40°C and 800rpm for 6h, centrifuged at 5000rpm for 15min, the precipitate was washed three times with anhydrous ethanol, dried in vacuum at 60°C for 12h, and passed through a 200-mesh sieve to obtain the SiO2-coated aluminum powder.

[0029] 1.3 Preparation method

[0030] The preparation method of the water-based fluorocarbon outdoor paint in Table 1 comprises the following steps:

[0031] S1. Add CF-801 aqueous one-component fluorocarbon emulsion, aluminum powder (SiO2 coated aluminum powder or uncoated aluminum powder), BYK-190 wetting dispersant and deionized water into a dispersion kettle and stir at 1200 rpm for 20 min;

[0032] S2. Add Dow ASE-60 alkali swelling thickener and stir at 600 rpm for 10 min;

[0033] Add Dow Alesun RM-120W associative thickener and stir at 600 rpm for 15 min;

[0034] Add carbomer SF-1 acrylate copolymer zwitterionic directing agent and stir at 400 rpm for 20 min;

[0035] Add TEGO 902W defoamer and stir at 300 rpm for 10 min;

[0036] S5. Filter through a 200-mesh filter to obtain the water-based fluorocarbon outdoor paint.

[0037] 1.4 Determination of the performance of different water-based fluorocarbon outdoor paints

[0038] The test items are shown in Table 2, and the test results are shown in Table 3.

[0039] Table 2 Test items, test method basis and description

[0040]

[0041]

[0042] Table 3 Effect of different raw material formulas on the performance of water-based fluorocarbon outdoor paint

[0043]

[0044] As can be seen from Table 3, C5 water-based fluorocarbon outdoor paint is superior to C1-C4 in many aspects such as adhesion, hardness, salt spray resistance, thixotropic index, hardness and storage stability, indicating that the present invention can improve the performance of water-based fluorocarbon outdoor paint through the reasonable combination of SiO2-coated aluminum powder, compound thickener and zwitterionic directional agent-grade dispersant, and can be used in harsh outdoor environments such as marine climate and acid rain areas, and has good application prospects in the fields of building curtain walls and bridge steel structures.

[0045] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be limited by the claims and their equivalents.

Claims

1. A water-based fluorocarbon outdoor paint, characterized in that: The invention is prepared from the following raw materials by weight percentage: 65-75% of aqueous fluorocarbon emulsion, 8-12% of SiO2 coated aluminum powder, 1.5-3% of compound thickener, 2-4% of zwitterionic directing agent, 0.5-1% of dispersant, 0.075-0.15% of defoamer, and deionized water is added to 100%; Wherein, the composite thickener is composed of an alkali swelling thickener and an associative thickener; The zwitterionic directing agent is an acrylate copolymer.

2. The water-based fluorocarbon outdoor paint according to claim 1, characterized in that: The aqueous fluorocarbon emulsion CF-801 aqueous single-component fluorocarbon emulsion; The alkali swelling thickener is Dow's ASE-60; The associative thickener is Dow Aleson RM-120W; The zwitterionic directing agent is carbomer SF-1 acrylate copolymer; The dispersant is BYK-190 wetting dispersant; The defoamer is TEGO 902W defoamer.

3. The water-based fluorocarbon outdoor paint according to claim 1, characterized in that: The SiO2 coated aluminum powder is prepared by the following steps: a. 1000 g of aluminum powder with a D50 of 15 μm was added to 500 mL of anhydrous ethanol, ultrasonically dispersed at 300 W and 40 kHz for 30 min, centrifuged at 3000 rpm for 10 min, and the precipitate was washed three times with deionized water and dried in vacuo at 60 ° C for 12 h to obtain pretreated aluminum powder; b. Add 10 g of ethyl orthosilicate to 200 mL of anhydrous ethanol, stir at 500 rpm to dissolve, then add 300 mL of deionized water, and add ammonia water to adjust the pH value to 9.5 to form a transparent silica sol; c. The pretreated aluminum powder was added to the silica sol, stirred at 40°C and 800rpm for 6h, centrifuged at 5000rpm for 15min, the precipitate was washed three times with anhydrous ethanol, dried in vacuum at 60°C for 12h, and passed through a 200-mesh sieve to obtain the SiO2-coated aluminum powder.

4. A method for preparing the water-based fluorocarbon outdoor paint according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1. Add the aqueous fluorocarbon emulsion, SiO2-coated aluminum powder, dispersant and deionized water into the dispersion kettle and stir at 1200rpm for 20min; S2. Add alkali swelling thickener and stir at 600 rpm for 10 min; Add associative thickener and stir at 600 rpm for 15 min; Add zwitterionic directing agent and stir at 400 rpm for 20 min; Add defoamer and stir at 300 rpm for 10 min; S5. Filter through a 200-mesh filter to obtain the water-based fluorocarbon outdoor paint.

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