Functionalized water-based coating and preparation method thereof

Abstract

The invention discloses a kind of functionalized water-based paint and preparation method thereof, belong to the technical field of water-based acrylic resin coating.The functionalized water-based paint includes 75.00-90.00 parts of water-based acrylic resin, 1.00-8.00 parts of alkyd resin, 2.00-8.00 parts of hexamethoxymethyl melamine and / or silane coupling agent, 1.00-3.00 parts of dipropylene glycol butyl ether, 1.00-3.00 parts of composite fungicide and 5.00-15.00 parts of water, wherein, the composite fungicide includes the organic mildew-proof agent of isothiazolinone class of specific proportion, iodopropynyl n-butyl carbamate, 4-bromo-2,5-dichlorophenol, 4-tolyl diiodomethyl sulfone, metconazole organic mildew-proof agent, surfactant, stabilizer, benzyl alcohol and water.The functionalized water-based paint of the present invention has excellent antibacterial and mildew-proof function, high stability, strong anti-loss property, strong weather resistance, can be used outdoors for a long time.

Description

Technical Field

[0001] The present invention relates to the technical field of functional coatings, in particular to the technical field of water-based acrylic resin coatings with long-term mildew resistance. Background Art

[0002] During the production process of water-based paint, a large amount of water, cellulose, organic resin emulsion and other organic substances are added, which provides suitable growth conditions and nutrients for microorganisms such as pathogens and algae. As a result, under certain environmental conditions, various molds and bacteria can easily multiply in large numbers on the coating film, causing erosion of the paint film and seriously affecting the weather resistance of the water-based resin coating.

[0003] To improve the mildew resistance of water-based paints, a feasible technical approach is to add additives with bactericidal effects to water-based paints, specifically, to add organic fungicides for compatibility with the organic system of water-based paints. However, practice has shown that if organic fungicides with good bactericidal effects are directly added to the water-based paint system, not only will there still be certain compatibility issues between the two, but over time, the organic fungicides will continue to be lost from the water-based paint and the coating formed therefrom, resulting in a continuous weakening of the paint's antibacterial ability and a rapid decline in coating performance. In addition, water-based paints with the addition of organic fungicides often experience certain other performance losses, resulting in a significant decrease in weather resistance when used outdoors.

[0004] Therefore, obtaining a water-based acrylic resin coating with long-term mildew resistance and always maintaining excellent weather resistance is still a technical problem that needs to be solved urgently in the existing technology. Summary of the Invention

[0005] In order to solve the above-mentioned problems in the prior art, the purpose of the present invention is to provide a functional water-based coating and a preparation method thereof that can maintain excellent antibacterial and mildew-proof capabilities for a long time and stably and has excellent outdoor weather resistance.

[0006] The technical solutions of the present invention are as follows:

[0007] A functionalized water-based coating comprises the following raw material components in parts by mass: 75.00-90.00 parts of a water-based acrylic resin, 1.00-8.00 parts of an alkyd resin, 2.00-8.00 parts of hexamethoxymethyl melamine (HMMM) and / or 2.00-8.00 parts of a silane coupling agent 3-aminopropyltriethoxysilane (KH550), 1.00-3.00 parts of a film-forming aid dipropylene glycol butyl ether (DPNB), 1.00-3.00 parts of a composite fungicide, and 5.00-15.00 parts of water, wherein the composite The fungicide includes the following raw material components in parts by mass: 3.80-9.20 parts of isothiazolinone organic mildew inhibitor, 2.00-8.10 parts of metconazole organic mildew inhibitor, 2.50-8.00 parts of iodopropynyl n-butylcarbamate (IPBC), 1.20-6.00 parts of 4-bromo-2,5-dichlorophenol (DP), 12.00-25.00 parts of 4-tolyldiiodomethyl sulfone, 25.00-35.00 parts of benzyl alcohol, 12.00-30.00 parts of surfactant and 10.00-20.00 parts of stabilizer.

[0008] Preferably, the functionalized water-based coating comprises the following raw material components in parts by mass: 80.00-90.00 parts of water-based acrylic resin, 1.00-3.00 parts of alkyd resin, 3.00-5.00 parts of hexamethoxymethyl melamine (HMMM), 1.50-2.60 parts of film-forming aid dipropylene glycol butyl ether (DPNB), 1.00-3.00 parts of composite fungicide and 8.00-10.00 parts of water, wherein the composite fungicide comprises the following raw material components in parts by mass: 4 .00-8.60 parts of isothiazolinone organic mildew preventer, 2.60-5.60 parts of metconazole organic mildew preventer, 4.00-6.40 parts of iodopropynyl n-butylcarbamate (IPBC), 13.00-20.00 parts of 4-tolyldiiodomethyl sulfone, 1.65-4.00 parts of 4-bromo-2,5-dichlorophenol (DP), 30.00-35.00 parts of benzyl alcohol, 15.00-30.00 parts of surfactant and 10.00-15.00 parts of stabilizer.

[0009] Or, preferably, the functionalized water-based coating comprises the following raw material components in parts by mass: the functionalized water-based coating according to claim 1, characterized in that it comprises the following raw material components in parts by mass: 80.00-90.00 parts of water-based acrylic resin, 1.00-3.00 parts of alkyd resin, 3.00-5.00 parts of silane coupling agent 3-aminopropyltriethoxysilane (KH550), 1.80-2.40 parts of film-forming aid dipropylene glycol butyl ether (DPNB), 1.00-3.00 parts of composite fungicide and 8.00-10.00 parts of water, wherein The composite fungicide includes the following raw material components in parts by mass: 4.50-7.50 parts of isothiazolinone organic mildew inhibitor, 2.80-6.20 parts of metconazole organic mildew inhibitor, 3.00-6.40 parts of iodopropynyl n-butylcarbamate (IPBC), 14.00-20.00 parts of 4-tolyldiiodomethyl sulfone, 2.00-4.00 parts of 4-bromo-2,5-dichlorophenol (DP), 25.00-35.00 parts of benzyl alcohol, 14.00-20.00 parts of surfactant and 12.00-20.00 parts of stabilizer.

[0010] Or, preferably, the functionalized water-based coating comprises the following raw material components in parts by mass: 80.00-90.00 parts of water-based acrylic resin, 1.00-3.00 parts of alkyd resin, 3.00-5.00 parts of hexamethoxymethyl melamine (HMMM) or 3.00-5.00 parts of silane coupling agent 3-aminopropyl triethoxysilane (KH550), 1.50-2.20 parts of film-forming aid dipropylene glycol butyl ether (DPNB), 1.00-3.00 parts of composite fungicide and 8.00-10.00 parts of water The composite fungicide includes the following raw material components in parts by mass: 5.20-8.00 parts of isothiazolinone organic mildew inhibitor, 2.20-4.20 parts of metconazole organic mildew inhibitor, 3.00-4.60 parts of iodopropynyl n-butylcarbamate (IPBC), 12.00-16.00 parts of 4-tolyldiiodomethyl sulfone, 1.80-3.20 parts of 4-bromo-2,5-dichlorophenol (DP), 25.00-30.00 parts of benzyl alcohol, 15.00-25.00 parts of surfactant and 10.00-20.00 parts of stabilizer.

[0011] Preferably, the water-based acrylic resin has a molecular weight of 10,000-12,000 and / or a viscosity of 250 mPa·s-300 mPa·s.

[0012] More preferably, the water-based acrylic resin has a molecular weight of 10,000, a viscosity of 250 mPa·s, a solid content of 50%, and a pH of 8.

[0013] Preferably, the hydroxyl value of the alkyd resin is 12-15 mgKOH / g.

[0014] More preferably, the alkyd resin has a solid content of 40% and a hydroxyl value (mgKOH / g) of 12.

[0015] The present invention further provides a method for preparing the above-mentioned functionalized water-based coating, which comprises: first mixing the water-based acrylic resin, the alkyd resin, the hexamethoxymethyl melamine and / or the silane coupling agent 3-aminopropyltriethoxysilane (KH550), the film-forming aid dipropylene glycol butyl ether (DPNB), and the water under the action of mechanical force, then adding the composite fungicide, and performing a second mixing under the action of mechanical force to obtain the functionalized water-based coating.

[0016] Preferably, the first mixing condition is stirring at a temperature of 30-40° C. and a rotation speed of 400-800 rpm for 20-30 min.

[0017] Preferably, the second mixing condition is stirring at a temperature of 40-50° C. and a rotation speed of 200-600 rpm for 10-20 min.

[0018] The functionalized water-based coating of the present invention has excellent antibacterial and mildew-proof functions, high stability, strong anti-loss and weather resistance, and can be used outdoors for a long time;

[0019] The functionalized water-based coating of the present invention can reduce the loss, migration and degradation of the fungicide during use through the cross-linking effect of the modified acrylic resin system and the composite fungicide, thereby improving the long-term mildew resistance and weather resistance of the coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a comparison chart of the results of the mixed mold and mildew prevention test in the examples.

[0021] Figure 2 This is a comparison chart of aging results when performing weathering tests in the examples.

[0022] Figure 3 This is a comparison chart of the Aspergillus niger mildew resistance test results when performing the runoff test in the examples. DETAILED DESCRIPTION

[0023] The technical solutions of the present invention will be further described below in conjunction with the embodiments and drawings of the present invention. The embodiments described below are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0024] The surfactants used in the following examples may be one or more of sodium dialkyl sulfate (SDS), sodium lauryl polyoxyethylene ether sulfate (AES), cocamidopropyl betaine (CAPB), dodecyltrimethylammonium chloride (DTAC), fatty alcohol polyoxyethylene ether (AEO), alkylphenol polyoxyethylene ether (OP), cocamidopropyl dimethylaminoethyl lactone (CAB), lauryl dimethylaminoethyl lactone (LAB), etc.; the stabilizer may be one or more of sodium silicate (salt), polyacrylamide, isopropyl phosphate, polyvinyl alcohol, magnesium nitrate, etc.; the isothiazolinone organic mildew inhibitor may be one or more of octylisothiazolinone (OIT), dichloro-N-octyl-4-isothiazolinone (DCOIT), and benzisothiazolinone (BIT).

[0025] The aqueous acrylic resin used in the following examples has a molecular weight of 10,000, a viscosity of 250 mPa·s, a solid content of 50%, and a pH of 8. The alkyd resin used has a solid content of 40% and a hydroxyl value (mgKOH / g) of 12.

[0026] Example 1

[0027] 78.00 g of waterborne acrylic resin, 2.00 g of alkyd resin, 4.00 g of hexamethoxymethyl melamine (HMMM), 2.00 g of film-forming aid dipropylene glycol butyl ether (DPNB) and 12.00 g of water were mixed and stirred at 40°C and 500 rpm for 20-30 min. Subsequently, 2.00 g of composite fungicide TCB was added thereto and stirred at 50°C and 400 rpm for another 15 min. min, to prepare the functionalized water-based coating of the present invention; wherein, the composition of the composite fungicide TCB is: 6.70 parts of isothiazolinone organic mildew inhibitor, 3.60 parts of metconazole organic mildew inhibitor, 4.00 parts of iodopropynyl n-butylcarbamate (IPBC), 15.00 parts of 4-tolyldiiodomethyl sulfone, 4.00 parts of 4-bromo-2,5-dichlorophenol (DP), 30.00 parts of benzyl alcohol, 20.00 parts of surfactant and 15.00 parts of stabilizer.

[0028] Example 2

[0029] 82.00 g of waterborne acrylic resin, 3.00 g of alkyd resin, 3.00 g of HMMM, 2.60 g of DPNB and 9.00 g of water were mixed and stirred at a temperature of 40° C. and a rotation speed of 500 rpm for 30 min, and then 2.00 g of composite fungicide ADZ was added thereto, and stirred at a temperature of 50° C. and a rotation speed of 400 rpm for another 15 min to prepare the functionalized waterborne coating of the present invention; wherein the composite fungicide ADZ is composed of: 7.50 parts of isothiazolinone organic mildew inhibitor, 4.20 parts of metconazole organic mildew inhibitor, 3.40 parts of IPBC, 20.00 parts of 4-tolyldiiodomethyl sulfone, 3.40 parts of DP, 30.00 parts of benzyl alcohol, 15 parts of surfactant and 15.00 parts of

[0030] Stabilizer.

[0031] Example 3

[0032] 85 g.00 water-based acrylic resin, 2.00 g alkyd resin, 4.00 g HMMM, 1.80 g DPNB and 13.00 g water were mixed and stirred at 40° C. and 500 rpm for 30 min, followed by adding 2.00 g of composite fungicide NDA and stirring at 50° C. and 400 rpm for 15 min to prepare the functionalized water-based coating of the present invention; wherein the composite fungicide NDA is composed of: 8.50 parts of isothiazolinone organic mildew inhibitor, 5.20 parts of metconazole organic mildew inhibitor, 5.20 parts of IPBC, 12.00 parts of 4-tolyldiiodomethyl sulfone, 2.80 parts of DP, 35.00 parts of benzyl alcohol, 20.00 parts of surfactant and 15.00 parts of stabilizer.

[0033] Example 4

[0034] 90.00 g of water-based acrylic resin, 4.00 g of alkyd resin, 4.00 g of KH550, 1.50 g of DPNB and 8.00 g of water were mixed and stirred at a temperature of 40° C. and a rotation speed of 500 rpm for 30 min. Subsequently, 3.00 g of a composite fungicide NDA was added thereto, and the mixture was stirred at a temperature of 50° C. and a rotation speed of 400 rpm for another 15 min to prepare a functionalized water-based coating of the present invention; wherein the composite fungicide NDA is composed of: 8.50 parts of an isothiazolinone organic mildew inhibitor, 5.20 parts of a metconazole organic mildew inhibitor, 5.20 parts of IPBC, 12.00 parts of 4-tolyldiiodomethyl sulfone, 2.80 parts of DP, 35.00 parts of benzyl alcohol, 20.00 parts of a surfactant and 15.00 parts of a stabilizer.

[0035] Example 5

[0036] 88.00 g of waterborne acrylic resin, 3.00 g of alkyd resin, 4.00 g of KH550, 1.60 g of DPNB and 12.00 g of water were mixed and stirred at a temperature of 35° C. and a rotation speed of 500 rpm for 30 min. Subsequently, 2.00 g of a composite fungicide TCB was added thereto, and the mixture was stirred at a temperature of 50° C. and a rotation speed of 400 rpm for another 15 min to prepare a functionalized waterborne coating of the present invention; wherein the composite fungicide TCB is composed of: 6.70 parts of an isothiazolinone organic mildew inhibitor, 3.60 parts of a metconazole organic mildew inhibitor, 4.00 parts of IPBC, 15.00 parts of 4-tolyldiiodomethyl sulfone, 4.00 parts of DP, 30.00 parts of benzyl alcohol, 20.00 parts of a surfactant and 15.00 parts of a stabilizer.

[0037] Example 6

[0038] 82.00 g of water-based acrylic resin, 1.00 g of alkyd resin, 3.00 g of KH550, 2.00 g of DPNB and 15.00 g of water were mixed and stirred at a temperature of 35° C. and a rotation speed of 500 rpm for 30 min. Subsequently, 3 g of a composite fungicide ADZ was added thereto, and the mixture was stirred at a temperature of 45° C. and a rotation speed of 400 rpm for another 15 min to prepare a functionalized water-based coating of the present invention; wherein the composite fungicide ADZ is composed of: 7.50 parts of an isothiazolinone organic mildew inhibitor, 4.20 parts of a metconazole organic mildew inhibitor, 3.40 parts of IPBC, 20 parts of 4-tolyldiiodomethyl sulfone, 3.40 parts of DP, 30.00 parts of benzyl alcohol, 15 parts of a surfactant and 15.00 parts of a stabilizer.

[0039] Comparative Example 1

[0040] Untreated bamboo.

[0041] Comparative Example 2

[0042] 90.00 g of waterborne acrylic resin, 2.00 g of alkyd resin, 4.00 g of HMMM and 9.00 g of water were mixed and stirred at 35° C. and 400 rpm for 15 min to prepare a waterborne coating.

[0043] Comparative Example 3

[0044] 88.00 g of water-based acrylic resin, 2.00 g of composite fungicide ADZ, 2.00 g of DPNB and 8.00 g of deionized water were stirred at 40° C. and 400 rpm for 15 min to prepare a water-based antibacterial coating, wherein the composite fungicide ADZ is composed of: 7.50 parts of isothiazolinone organic mildew inhibitor, 4.20 parts of metconazole organic mildew inhibitor, 3.40 parts of IPBC, 20 parts of 4-tolyldiiodomethyl sulfone, 3.40 parts of DP, 30.00 parts of benzyl alcohol, 15.00 parts of surfactant and 15.00 parts of stabilizer.

[0045] Comparative Example 4

[0046] 80.00 g of water-based acrylic resin, 4.00 g of HMMM and 9.00 g of water were mixed and stirred at 35° C. and 500 rpm for 30 min. Subsequently, 2.00 g of propiconazole was added thereto, and the mixture was stirred at 40° C. and 400 rpm for another 15 min to prepare a water-based antibacterial coating.

[0047] Comparative Example 5

[0048] 80.00 g of waterborne acrylic resin, 2.00 g of alkyd resin, 4.00 g of HMMM, 1.50 g of DPNB and 9.00 g of water were mixed and stirred at 30° C. and 500 rpm for 30 min. Subsequently, 2.00 g of propiconazole was added thereto and stirred at 40° C. and 400 rpm for 15 min to prepare a waterborne antibacterial coating.

[0049] Comparative Example 6

[0050] 82.00 g of a water-based acrylic resin, 2.00 g of an alkyd resin, and 9.00 g of water were mixed and stirred at 35° C. and 500 rpm for 30 min. 3.00 g of a comparative fungicide was added to the water-based acrylic resin coating and stirred at 40° C. and 400 rpm for 15 min to prepare a water-based antibacterial coating. The comparative fungicide was composed of 8.70 parts of IPBC, 15.00 parts of 4-tolyldiiodomethyl sulfone, 30.00 parts of benzyl alcohol, 20.00 parts of a surfactant, and 24.00 parts of a stabilizer.

[0051] The coatings obtained in Examples 1, 2, 5 and Comparative Examples 2 and 4 were applied to bamboo specimens. Each specimen was applied twice and dried for 24 hours at 25°C. A mixed multi-bacteria environment mildew resistance test was performed according to GB / T 18261-2000 "Test Method for the Control of Wood Mold and Blue Stain Fungi by Antifungal Agents" and the American Wood Protection Association standard AWPA E24-06. The same bamboo specimens not coated with the coating (Comparative Example 1) were used as a comparison. The control efficacy was calculated according to the following formula:

[0052]

[0053] Where: RE is the control effect, D t is the average damage value of the specimen; D o is the average damage value of the control sample. The results are shown in Table 1 and Appendix Figure 1 As shown, Figure 1 a) shows the bamboo specimens before painting, and 1b) shows the bamboo specimens 14 weeks after painting.

[0054] Table 1 Test results of anti-mildew performance of bamboo

[0055] test piece Mixed mold control effectiveness Damage Value Example 1 100 0 Example 2 100 0 Example 5 100 0 Comparative Example 2 0 4 Comparative Example 4 25 3 Untreated bamboo 0 4

[0056] The above test results show that the untreated bamboo had an infection value of up to 4 after 14 weeks, while the bamboo treated with the functionalized water-based coating of the present invention (Examples 1, 2, and 5) had an infection value of 0 under the same conditions, with an anti-mildew efficacy of up to 100%. The bamboo treated with a system containing a conventional fungicide and a modified acrylic resin (Comparative Example 4) had an infection value of 3 and an anti-mildew efficacy of 25%. This indicates that the modified coating using only the conventional compounding system does not have an excellent long-term anti-mildew effect, while the functionalized coating using the composite system of the present invention has an excellent anti-mildew effect and a long-lasting effect.

[0057] Furthermore, the functionalized water-based coatings obtained in Examples 1, 3, 4, 5, and 6, and the fungicides or coatings obtained in Comparative Examples 3 and 5, were applied to bamboo specimens. Each specimen was applied twice, and after drying for 24 hours at 25°C, an aging test was carried out using a fluorescent UV aging test chamber. The same bamboo specimens that were not coated were used as a comparison.

[0058] During the aging test, the lamps in the box are UVB-340 lamps that can simulate short-wave ultraviolet light. The ambient temperature is 50°C. Water is sprayed once every 102 minutes for 18 minutes. The aging time is 216 hours. The coating aging grade is assessed by referring to the visual colorimetry of paints and varnishes in GB / T9761.

[0059] The test results are as attached Figure 2As shown in Table 2, the results show that the untreated bamboo material in Comparative Example 1 had an aging rating of 5, while those in Comparative Examples 3 and 5 had an aging rating of 4. This indicates that the bamboo coatings using only unmodified water-based acrylic resin and composite fungicide, and those using only conventional fungicide and modified acrylic resin in the composite system, exhibited high degrees of aging and poor weather resistance. In contrast, the bamboo coatings treated with the functionalized water-based coatings of Examples 1, 3, 4, 5, and 6 exhibited aging ratings of only 0 and 1, respectively. This indicates that the composite fungicide and modified water-based acrylic resin in the present invention form a denser network structure, enhancing the mechanical properties and water resistance of the paint film, making the coating less susceptible to damage and further improving its weather resistance.

[0060] Table 2 Test results of weather resistance of bamboo

[0061] test piece Degree of change in damage Degree of change Example 1 0 No change, that is, no perceptible change Example 3 1 Very slight, just noticeable change Example 4 0 No change, that is, no perceptible change Example 5 1 Very slight, just noticeable change Example 6 0 No change, that is, no perceptible change Comparative Example 3 4 Larger, i.e., greater changes Comparative Example 5 4 Larger, i.e., greater changes Untreated bamboo 5 Severe, that is, strong changes

[0062] Furthermore, the functionalized water-based coatings of Examples 1, 3, 5, and 6, and the water-based antibacterial coatings of Comparative Example 5 and Comparative Example 6 were applied to bamboo specimens. Each specimen was applied twice and dried at 25°C for 24 hours. The treated specimens were placed in a beaker, added with water, and placed on a magnetic stirrer for 400 r / min loss. The water was changed at 6 hours, 12 hours, 18 hours, 24 hours, and 48 hours, and then every 48 hours until 336 hours. After the end, the specimens were taken out, and then the specimens were taken out after 14 days of loss, and an anti-mildew test was performed on a culture medium full of Aspergillus niger.

[0063] The results of the mildew test after 2 weeks are as follows Figure 3 As shown in the figure, Comparative Example 5 shows the mildew prevention results after the addition of the fungicide propiconazole and modified acrylic resin. The control efficacy is 0%, which proves that the compatibility of ordinary fungicides and modified water-based acrylic resin is poor, and the fungicide exhibits significant runoff and migration. Comparative Example 6 shows the mildew prevention test results of an ordinary compound system. Its control efficacy is 25%, which proves that a simple compound system cannot significantly reduce the migration of fungicides during runoff. However, the control efficacy of the fungicides ADZ, NDA, and TCB after compounding with the modified water-based acrylic resin and other additives and stabilizers in the present invention reaches 100%, which is significantly better than the comparative example, indicating that the compound system of the present invention can significantly reduce the runoff and migration of fungicides.

[0064] It should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the technical solutions of the present invention. Any modifications to the technical solutions described in the aforementioned embodiments, or equivalent replacements of technical features made by persons of ordinary skill in the art that fall within the spirit and principles of the present invention, shall be included within the scope of protection of the present invention.

Claims

1. A functionalized water-based coating comprising the following raw material components in parts by mass: 75.00-90.00 parts of a water-based acrylic resin, 1.00-8.00 parts of an alkyd resin, 2.00-8.00 parts of hexamethoxymethyl melamine and / or 2.00-8.00 parts of 3-aminopropyltriethoxysilane, 1.00-3.00 parts of dipropylene glycol butyl ether, 1.00-3.00 parts of a composite fungicide, and 5.00-15.00 parts of water, wherein: The composite fungicide comprises the following raw material components in parts by mass: 3.80-9.20 parts of an isothiazolinone organic mildew inhibitor, 2.00-8.10 parts of a metconazole organic mildew inhibitor, 2.50-8.00 parts of iodopropynyl n-butylcarbamate, 1.20-6.00 parts of 4-bromo-2,5-dichlorophenol, 12.00-25.00 parts of 4-tolyldiiodomethyl sulfone, 25.00-35.00 parts of benzyl alcohol, 12.00-30.00 parts of a surfactant, and 10.00-20.00 parts of a stabilizer.

2. The functionalized water-based coating according to claim 1, characterized in that: The composite fungicide comprises the following raw material components in parts by mass: 80.00-90.00 parts of waterborne acrylic resin, 1.00-3.00 parts of alkyd resin, 3.00-5.00 parts of hexamethoxymethyl melamine, 1.50-2.60 parts of dipropylene glycol butyl ether, 1.00-3.00 parts of composite fungicide and 8.00-10.00 parts of water, wherein the composite fungicide comprises the following raw material components in parts by mass: 4.00-8.60 parts of Isothiazolinone organic mildew preventer, 2.60-5.60 parts of metconazole organic mildew preventer, 4.00-6.40 parts of iodopropynyl n-butylcarbamate, 13.00-20.00 parts of 4-tolyldiiodomethyl sulfone, 1.65-4.00 parts of 4-bromo-2,5-dichlorophenol, 30.00-35.00 parts of benzyl alcohol, 15.00-30.00 parts of surfactant and 10.00-15.00 parts of stabilizer.

3. The functionalized water-based coating according to claim 1, characterized in that: The composite fungicide comprises the following raw material components in parts by mass: 80.00-90.00 parts of waterborne acrylic resin, 1.00-3.00 parts of alkyd resin, 3.00-5.00 parts of 3-aminopropyltriethoxysilane, 1.80-2.40 parts of dipropylene glycol butyl ether, 1.00-3.00 parts of composite fungicide and 8.00-10.00 parts of water, wherein the composite fungicide comprises the following raw material components in parts by mass: 4.50-7.50 parts Isothiazolinone organic mildew preventer, 2.80-6.20 parts of metconazole organic mildew preventer, 3.00-6.40 parts of iodopropynyl n-butylcarbamate, 14.00-20.00 parts of 4-tolyldiiodomethyl sulfone, 2.00-4.00 parts of 4-bromo-2,5-dichlorophenol, 25.00-35.00 parts of benzyl alcohol, 14.00-20.00 parts of surfactant and 12.00-20.00 parts of stabilizer.

4. The functionalized water-based coating according to claim 1, characterized in that: The composite fungicide comprises the following raw materials in parts by mass: 80.00-90.00 parts of waterborne acrylic resin, 1.00-3.00 parts of alkyd resin, 3.00-5.00 parts of hexamethoxymethyl melamine or 3.00-5.00 parts of 3-aminopropyl triethoxysilane, 1.50-2.20 parts of film-forming aid dipropylene glycol butyl ether, 1.00-3.00 parts of composite fungicide and 8.00-10.00 parts of water, wherein the composite fungicide comprises the following raw materials in parts by mass: Components: 5.20-8.00 parts of isothiazolinone organic mildew preventer, 2.20-4.20 parts of metconazole organic mildew preventer, 3.00-4.60 parts of iodopropynyl n-butyl carbamate, 12.00-16.00 parts of 4-tolyl diiodomethyl sulfone, 1.80-3.20 parts of 4-bromo-2,5-dichlorophenol, 25.00-30.00 parts of benzyl alcohol, 15.00-25.00 parts of surfactant and 10.00-20.00 parts of stabilizer.

5. The functionalized water-based coating according to claim 1, characterized in that: The molecular weight of the water-based acrylic resin is 10,000-12,000 and / or the viscosity is 250 mPa·s-300 mPa·s.

6. The functionalized water-based coating according to claim 1, characterized in that: The hydroxyl value of the alkyd resin is 12-15 mgKOH / g.

7. The method for preparing the functionalized water-based coating according to any one of claims 1 to 4, characterized in that: It includes: The water-based acrylic resin, the alkyd resin, the hexamethoxymethyl melamine and / or 3-aminopropyl triethoxysilane, the dipropylene glycol butyl ether and the water are first mixed under the action of mechanical force, and then the composite fungicide is added and secondly mixed under the action of mechanical force to obtain the functionalized water-based coating.

8. The preparation method according to claim 7, characterized in that The first mixing condition is stirring at a temperature of 30-40° C. and a rotation speed of 400-800 rpm for 20-30 min.

9. The preparation method according to claim 7, characterized in that The second mixing condition is stirring at a temperature of 40-50° C. and a rotation speed of 200-600 rpm for 10-20 min.

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