A mildew-proof and condensation-proof environmentally friendly coating and preparation method thereof

Abstract

The present invention relates to the field of building materials technology and proposes an environmentally friendly, mildew-proof and condensation-proof coating. The coating comprises the following raw materials by weight: 40 to 50 parts of an emulsion, 10 to 15 parts of a thermal insulation material, 20 to 30 parts of modified sepiolite, 4 to 6 parts of a mildew-proof material, 8 to 12 parts of a film-forming aid, 20 to 30 parts of an inorganic filler, 3 to 5 parts of a dispersant, 4 to 6 parts of a flame retardant, 2 to 4 parts of a preservative, and 30 to 40 parts of water. The modified sepiolite is sepiolite modified with N-carboxymethylamino-2-ethanol and 1-methyl-4-imidazolecarboxylic acid. This technical solution solves the problem of low mildew resistance and low condensation resistance of latex coatings in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of building materials, and in particular to an anti-mildew and anti-condensation environmentally friendly coating and a preparation method thereof. Background Art

[0002] Architectural coatings are materials applied to surfaces that bond well to the substrate, forming a complete, tough protective film. They generally serve both protective and decorative purposes. However, in areas like basements, kitchens, and bathrooms, where poor ventilation and temperature fluctuations occur, condensation is a common occurrence. This condensation not only causes discomfort but also induces and accelerates corrosion of the substrate and the growth of mold. While the addition of water-absorbing agents to latex paints can address this condensation problem, latex paints lack film-forming properties and are not dense enough, making them susceptible to bacterial and microbial attack, leading to mold spots. This not only affects the aesthetics of buildings but also poses a health risk. Summary of the Invention

[0003] The present invention provides an anti-mildew and anti-condensation environmentally friendly paint and a preparation method thereof, which solves the problems of low mildew resistance and low anti-condensation properties of latex paint in the related art.

[0004] The technical solutions of the present invention are as follows:

[0005] The present invention provides an anti-mildew and anti-condensation environmentally friendly coating, comprising the following raw materials in parts by weight: 40-50 parts of emulsion, 10-15 parts of thermal insulation material, 20-30 parts of modified sepiolite, 4-6 parts of anti-mildew material, 8-12 parts of film-forming aid, 20-30 parts of inorganic filler, 3-5 parts of dispersant, 4-6 parts of flame retardant, 2-4 parts of preservative, and 30-40 parts of water;

[0006] The modified sepiolite is obtained by modifying sepiolite with N-carboxymethylamino-2-ethanol and 1-methyl-4-imidazolecarboxylic acid.

[0007] As a further technical solution, the total mass of the N-carboxymethylamino-2-ethanol and 1-methyl-4-imidazolecarboxylic acid is 4% to 8% of the mass of the sepiolite.

[0008] As a further technical solution, the total mass of the N-carboxymethylamino-2-ethanol and 1-methyl-4-imidazolecarboxylic acid is 6% of the mass of the sepiolite.

[0009] As a further technical solution, the mass ratio of the N-carboxymethylamino-2-ethanol and 1-methyl-4-imidazolecarboxylic acid is 1-4:1.

[0010] As a further technical solution, the mass ratio of the N-carboxymethylamino-2-ethanol and 1-methyl-4-imidazolecarboxylic acid is 3:1.

[0011] As a further technical solution, the preparation method of the modified sepiolite comprises the following steps:

[0012] A1. Adding sepiolite to a hydrochloric acid solution to activate it to obtain acid-activated sepiolite;

[0013] A2. Acid-activated sepiolite is added to an ethanol solution and uniformly dispersed, and then N-carboxymethylamino-2-ethanol and 1-methyl-4-imidazolecarboxylic acid are added to modify the sepiolite to obtain modified sepiolite.

[0014] As a further technical solution, A2 is to add acid-activated sepiolite to an ethanol solution, disperse it evenly, preheat it, and then add N-carboxymethylamino-2-ethanol and 1-methyl-4-imidazolecarboxylic acid to modify it to obtain modified sepiolite.

[0015] As a further technical solution, the preheating temperature is 45-55° C., and the preheating time is 40-50 minutes.

[0016] As a further technical solution, the modification temperature is 80-90° C., and the modification time is 2-3 hours.

[0017] As a further technical solution, the ethanol solution is composed of a 95% by mass ethanol solution and water in a volume ratio of 1:5.

[0018] As a further technical solution, the emulsion includes one or more of pure acrylic emulsion, acetic acid acrylic emulsion, water-based epoxy resin emulsion, and water-based acrylic resin emulsion.

[0019] As a further technical solution, the thermal insulation material includes one or more of hollow glass microspheres, hollow ceramic microspheres, and closed-cell expanded perlite.

[0020] As a further technical solution, the anti-mildew material includes one or both of zinc oxide and titanium dioxide.

[0021] As a further technical solution, the film-forming aid includes one or more of ethylene glycol butyl ether, alcohol ester dodecyl ether, and propylene glycol phenyl ether.

[0022] As a further technical solution, the inorganic filler includes one or more of titanium dioxide, heavy calcium powder, gray calcium powder, and talc.

[0023] As a further technical solution, the dispersant includes one or both of sodium polycarboxylate and sodium polyacrylate.

[0024] As a further technical solution, the flame retardant includes one or more of aluminum hydroxide, magnesium hydroxide, and antimony trioxide.

[0025] As a further technical solution, the preservative includes one or more of thymol, methyl benzimidazole-5-carboxylate, and ethyl 2-benzimidazole acetate.

[0026] The present invention also provides a method for preparing an anti-mildew and anti-condensation environment-friendly coating, comprising the following steps: uniformly mixing the raw materials to obtain the anti-mildew and anti-condensation environment-friendly coating.

[0027] The working principle and beneficial effects of the present invention are:

[0028] 1. In the present invention, after adding sepiolite modified with N-carboxymethylamino-2-ethanol and 1-methyl-4-imidazolecarboxylic acid to the coating, it can form a dense network structure with the emulsion, mildew-proof material, filler, etc., which helps the coating to form a dense film structure, thereby improving the mildew resistance of the coating. In addition, the modified sepiolite has multiple active sites that can adsorb water molecules, which can improve the anti-condensation property of the coating. In addition, after being modified with N-carboxymethylamino-2-ethanol and 1-methyl-4-imidazolecarboxylic acid, the sepiolite has mildew resistance and can synergize with the mildew inhibitor to further improve the mildew resistance of the coating. DETAILED DESCRIPTION

[0029] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0030] In the following examples and comparative examples,

[0031] The model of hollow glass microspheres is VS5500;

[0032] The hollow ceramic microspheres are item number 23 and are manufactured by Gongyi Jiahong Refractory Materials Co., Ltd.

[0033] The closed-cell expanded perlite is item number 012 and is manufactured by Lingshou County Tusheng Mineral Products Co., Ltd.

[0034] The item number of the sepiolite is 003, and the manufacturer is Chongqing Jinjuyuan New Material Technology Co., Ltd.

[0035] The product number of zinc oxide is O-101, and the manufacturer is Qinghe County Yaoxie Metal Materials Co., Ltd.

[0036] The model of titanium dioxide is R-902, and the manufacturer is Zhengzhou Xinke Chemical Products Co., Ltd.

[0037] The model of styrene-acrylic acid copolymer emulsion is HD-OP301;

[0038] The model of ethylene-acetate-vinyl copolymer emulsion is BJ-806;

[0039] The model of titanium dioxide is R-TC30, and the manufacturer is Tianjin Master Technology Co., Ltd.

[0040] The particle size of heavy calcium powder is 1250 mesh;

[0041] The fineness of talcum powder is 325 mesh;

[0042] The model of aluminum hydroxide is FR-3815, and the manufacturer is Hefei Zhongke Flame Retardant New Materials Co., Ltd.

[0043] The model of magnesium hydroxide is QMS-KB-60, and the manufacturer is Weifang Lihe Powder Technology Co., Ltd.

[0044] The fineness of antimony trioxide is 400 mesh;

[0045] The ethanol solution is composed of a 95% by mass ethanol solution and water in a volume ratio of 1:5.

[0046] Example 1

[0047] A method for preparing an anti-mildew and anti-condensation environmentally friendly coating comprises the following steps:

[0048] 40 parts of pure acrylic emulsion, 10 parts of hollow glass microspheres, 20 parts of modified sepiolite, 4 parts of zinc oxide, 8 parts of ethylene glycol butyl ether, 20 parts of titanium dioxide, 3 parts of sodium polyacrylate, 4 parts of aluminum hydroxide, 2 parts of ethyl 2-benzimidazole acetate and 30 parts of water are added into a blender and dispersed evenly to obtain an anti-mildew and anti-condensation environmentally friendly coating.

[0049] The preparation method of modified sepiolite comprises the following steps:

[0050] A1. Add 50 g of sepiolite to 500 mL of 1 mol / L hydrochloric acid solution, activate with magnetic stirring for 2 h, let it stand for 24 h, take the upper suspension by suction filtration, wash with distilled water until neutral, and dry at 100°C to obtain acid-activated sepiolite;

[0051] A2. Acid-activated sepiolite was added to 600 mL of ethanol solution, and after ultrasonic dispersion, the mixture was preheated at 45°C for 50 min, 1 g of N-carboxymethylamino-2-ethanol and 1 g of 1-methyl-4-imidazolecarboxylic acid were added, and the mixture was modified at 85°C for 3 h. The mixture was then filtered and washed with ethanol solution. The mixture was dried at 80°C and ground to obtain modified sepiolite.

[0052] Example 2

[0053] A method for preparing an anti-mildew and anti-condensation environmentally friendly coating comprises the following steps:

[0054] 45 parts of acetic acid acrylic emulsion, 13 parts of hollow ceramic microspheres, 25 parts of modified sepiolite, 5 parts of zinc oxide, 10 parts of alcohol ester dodecahydrate, 25 parts of heavy calcium powder, 4 parts of sodium polycarboxylate, 5 parts of magnesium hydroxide, 3 parts of methyl benzimidazole-5-carboxylate and 35 parts of water are added into a blender and uniformly dispersed to obtain an anti-mildew and anti-condensation environmentally friendly coating.

[0055] The preparation method of modified sepiolite comprises the following steps:

[0056] A1. Add 50 g of sepiolite to 500 mL of 1 mol / L hydrochloric acid solution, activate with magnetic stirring for 2 h, let it stand for 24 h, take the upper suspension by suction filtration, wash with distilled water until neutral, and dry at 100°C to obtain acid-activated sepiolite;

[0057] A2. Acid-activated sepiolite was added to 600 mL of ethanol solution, and after ultrasonic dispersion, the mixture was preheated at 50°C for 45 min, 1 g of N-carboxymethylamino-2-ethanol and 1 g of 1-methyl-4-imidazolecarboxylic acid were added, and the mixture was modified at 80°C for 2.5 h. The mixture was then filtered and washed with ethanol solution. The mixture was dried at 80°C and ground to obtain modified sepiolite.

[0058] Example 3

[0059] A method for preparing an anti-mildew and anti-condensation environmentally friendly coating comprises the following steps:

[0060] 50 parts of water-based epoxy resin emulsion, 15 parts of closed-cell expanded perlite, 30 parts of modified sepiolite, 6 parts of titanium dioxide, 12 parts of propylene glycol phenyl ether, 30 parts of talc, 5 parts of sodium polycarboxylate, 6 parts of antimony trioxide, 4 parts of thymol and 40 parts of water are added into a blender and dispersed evenly to obtain an anti-mildew and anti-condensation environmentally friendly coating.

[0061] The preparation method of modified sepiolite comprises the following steps:

[0062] A1. Add 50 g of sepiolite to 500 mL of 1 mol / L hydrochloric acid solution, activate with magnetic stirring for 2 h, let it stand for 24 h, take the upper suspension by suction filtration, wash with distilled water until neutral, and dry at 100°C to obtain acid-activated sepiolite;

[0063] A2. Acid-activated sepiolite was added to 600 mL of ethanol solution, and after ultrasonic dispersion, the mixture was preheated at 55°C for 40 min, 1 g of N-carboxymethylamino-2-ethanol and 1 g of 1-methyl-4-imidazolecarboxylic acid were added, and the mixture was modified at 95°C for 2 h. The mixture was then filtered and washed with ethanol solution. The mixture was dried at 80°C and ground to obtain modified sepiolite.

[0064] Example 4

[0065] The only difference between this embodiment and embodiment 1 is that 25 parts of modified sepiolite are added.

[0066] Example 5

[0067] The only difference between this embodiment and embodiment 1 is that 30 parts of modified sepiolite are added.

[0068] Example 6

[0069] The only difference between this embodiment and embodiment 1 is that 15 parts of modified sepiolite are added.

[0070] Example 7

[0071] The only difference between this embodiment and embodiment 1 is that 35 parts of modified sepiolite are added.

[0072] Example 8

[0073] The only difference between this embodiment and embodiment 1 is that 1.5 g of N-carboxymethylamino-2-ethanol and 1.5 g of 1-methyl-4-imidazolecarboxylic acid are added.

[0074] Example 9

[0075] The only difference between this embodiment and embodiment 1 is that 2 g of N-carboxymethylamino-2-ethanol and 2 g of 1-methyl-4-imidazolecarboxylic acid are added.

[0076] Example 10

[0077] The difference between this embodiment and embodiment 1 is that 0.75 g of N-carboxymethylamino-2-ethanol and 0.75 g of 1-methyl-4-imidazolecarboxylic acid are added.

[0078] Example 11

[0079] The difference between this embodiment and embodiment 1 is that 2.25 g of N-carboxymethylamino-2-ethanol and 2.25 g of 1-methyl-4-imidazolecarboxylic acid are added.

[0080] Example 12

[0081] The only difference between this embodiment and embodiment 1 is that 1.5 g of N-carboxymethylamino-2-ethanol and 0.5 g of 1-methyl-4-imidazolecarboxylic acid are added.

[0082] Example 13

[0083] The only difference between this embodiment and embodiment 1 is that 1.6 g of N-carboxymethylamino-2-ethanol and 0.4 g of 1-methyl-4-imidazolecarboxylic acid are added.

[0084] Example 14

[0085] The difference between this embodiment and embodiment 1 is that 0.75 g of N-carboxymethylamino-2-ethanol and 1.25 g of 1-methyl-4-imidazolecarboxylic acid are added.

[0086] Example 15

[0087] The only difference between this embodiment and embodiment 1 is that 1.75 g of N-carboxymethylamino-2-ethanol and 0.25 g of 1-methyl-4-imidazolecarboxylic acid are added.

[0088] Comparative Example 1

[0089] The only difference between this comparative example and Example 1 is that the modified sepiolite is replaced by an equal amount of sepiolite.

[0090] Comparative Example 2

[0091] The only difference between this comparative example and Example 1 is that N-carboxymethylamino-2-ethanol is not added.

[0092] Comparative Example 3

[0093] The only difference between this comparative example and Example 1 is that 1-methyl-4-imidazolecarboxylic acid is not added.

[0094] Performance testing:

[0095] The anti-mildew and anti-condensation environmentally friendly coatings obtained in Examples 1 to 15 and Comparative Examples 1 to 3 were subjected to the method in GB / T 35166-2017 "Determination of hygrothermal properties of building materials and products - Determination of moisture absorption and desorption properties - Humidity reaction method" and the NORDTEST experiment. The samples dried to constant weight were placed in a constant temperature and humidity chamber, and the ambient temperature and relative humidity were set to 23°C and 30% respectively. The process lasted for 24 hours to allow the samples to reach a constant weight. The samples were then allowed to absorb moisture at a relative humidity of 70% for 12 hours and then dehumidified at a relative humidity of 30% for 12 hours. The moisture absorption was measured according to the HG / T 3950-2007 "Antibacterial Coatings" method was used to determine its mildew resistance (sample mildew growth grade standard: Grade 0, no growth, i.e. no growth observed under a microscope; Grade 1, trace growth, i.e. growth visible to the naked eye, but the growth coverage area is less than 10%; Grade 2, growth coverage area greater than 10% but less than 15%; Grade 3, growth coverage area greater than 15% but less than 20%; Grade 4, growth coverage area greater than 20% but less than 25%; Grade 5, growth coverage area greater than 25% but less than 30%). The test results are shown in Table 1.

[0096] Table 1 Performance test results of the anti-mildew and anti-condensation environmentally friendly coatings obtained in Examples 1 to 15 and Comparative Examples 1 to 3

[0097]

[0098] In the present invention, compared with Example 1, Comparative Example 1 replaces the modified sepiolite with an equal amount of sepiolite, Comparative Example 2 does not add N-carboxymethylamino-2-ethanol, and Comparative Example 3 does not add 1-methyl-4-imidazolecarboxylic acid. As a result, the moisture absorption in Comparative Examples 1 to 3 is lower than that in Example 1, and the mold growth level is higher than that in Example 1, indicating that adding sepiolite modified with N-carboxymethylamino-2-ethanol and 1-methyl-4-imidazolecarboxylic acid to the coating can increase the moisture absorption and reduce the mold growth level of the coating, thereby improving the anti-condensation and anti-mildew properties of the coating.

[0099] Compared with Example 1, Examples 4 to 7 changed the amount of modified sepiolite added. As a result, the moisture absorption in Examples 6 to 7 was lower than that in Example 1 and Examples 4 to 5, and the mold growth level was higher than that in Example 1 and Examples 4 to 5. This shows that when the amount of sepiolite added is 20 to 30 parts, the moisture absorption of the coating can be increased and the mold growth level can be reduced, thereby improving the anti-condensation and anti-mildew properties of the coating. In addition, the moisture absorption in Examples 1 and 5 is lower than that in Example 4, indicating that when the amount of sepiolite added is 25 parts, the moisture absorption of the coating can be further increased, thereby further improving the anti-condensation properties of the coating.

[0100] Compared with Example 1, Examples 8 to 11 changed the mass of N-carboxymethylamino-2-ethanol and 1-methyl-4-imidazolecarboxylic acid and the ratio of the mass of sepiolite. As a result, the moisture absorption in Examples 10 to 11 was lower than that in Examples 1 and Examples 8 to 9, and the mold growth level was higher than that in Examples 1 and Examples 8 to 9, indicating that when the total mass of N-carboxymethylamino-2-ethanol and 1-methyl-4-imidazolecarboxylic acid was 4% to 8% of the mass of sepiolite, the moisture absorption of the coating could be increased and the mold growth level could be reduced, thereby improving the anti-condensation and mildew resistance of the coating. In addition, the moisture absorption in Examples 1 and 9 was lower than that in Example 8, and the mildew growth level was higher than that in Example 8, indicating that when the total mass of N-carboxymethylamino-2-ethanol and 1-methyl-4-imidazolecarboxylic acid was 6% of the mass of sepiolite, the moisture absorption of the coating could be further increased and the mildew growth level could be reduced, thereby further improving the anti-condensation and mildew resistance of the coating.

[0101] Compared with Example 1, Examples 12 to 15 changed the mass ratio of N-carboxymethylamino-2-ethanol and 1-methyl-4-imidazolecarboxylic acid. As a result, the moisture absorption in Examples 14 to 15 was lower than that in Examples 1 and Examples 12 to 13, and the mold growth level was higher than that in Examples 1 and Examples 12 to 13, indicating that when the mass ratio of N-carboxymethylamino-2-ethanol and 1-methyl-4-imidazolecarboxylic acid is 1 to 4:1, the moisture absorption of the coating can be increased and the mold growth level can be reduced, thereby improving the anti-condensation and mildew resistance of the coating. In addition, the moisture absorption in Examples 1 and 13 is lower than that in Example 12, and the mildew growth level is higher than that in Example 12, indicating that when the mass ratio of N-carboxymethylamino-2-ethanol and 1-methyl-4-imidazolecarboxylic acid is 3:1, the moisture absorption of the coating can be further increased and the mildew growth level can be reduced, thereby further improving the anti-condensation and mildew resistance of the coating.

[0102] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A mildew-proof and condensation-proof environmentally friendly coating, characterized in that: The raw materials include the following components in parts by weight: 40-50 parts of emulsion, 10-15 parts of thermal insulation material, 20-30 parts of modified sepiolite, 4-6 parts of mildew-proof material, 8-12 parts of film-forming aid, 20-30 parts of inorganic filler, 3-5 parts of dispersant, 4-6 parts of flame retardant, 2-4 parts of preservative, and 30-40 parts of water; The modified sepiolite is obtained by modifying sepiolite with N-carboxymethylamino-2-ethanol and 1-methyl-4-imidazolecarboxylic acid.

2. The anti-mildew and anti-condensation environmentally friendly coating according to claim 1, characterized in that: The total mass of the N-carboxymethylamino-2-ethanol and 1-methyl-4-imidazolecarboxylic acid is 4% to 8% of the mass of the sepiolite.

3. The anti-mildew and anti-condensation environmentally friendly coating according to claim 1, characterized in that: The mass ratio of the N-carboxymethylamino-2-ethanol and 1-methyl-4-imidazolecarboxylic acid is 1-4:

1.

4. The anti-mildew and anti-condensation environmentally friendly coating according to claim 1, characterized in that: The preparation method of the modified sepiolite comprises the following steps: A1. Adding sepiolite to a hydrochloric acid solution to activate it to obtain acid-activated sepiolite; A2. Acid-activated sepiolite is added to an ethanol solution and uniformly dispersed, and then N-carboxymethylamino-2-ethanol and 1-methyl-4-imidazolecarboxylic acid are added to modify the sepiolite to obtain modified sepiolite.

5. The anti-mildew and anti-condensation environmentally friendly coating according to claim 4, characterized in that: The modification temperature is 80-90° C., and the modification time is 2-3 hours.

6. The anti-mildew and anti-condensation environmentally friendly coating according to claim 1, characterized in that: The emulsion includes one or more of pure acrylic emulsion, acetic acid acrylic emulsion, and water-based epoxy resin emulsion.

7. The anti-mildew and anti-condensation environmentally friendly coating according to claim 1, characterized in that: The thermal insulation material includes one or more of hollow glass microspheres, hollow ceramic microspheres, and closed-cell expanded perlite.

8. The anti-mildew and anti-condensation environmentally friendly coating according to claim 1, characterized in that: The anti-mildew material includes one or both of zinc oxide and titanium dioxide.

9. The anti-mildew and anti-condensation environmentally friendly coating according to claim 1, characterized in that: The film-forming aid includes one or more of ethylene glycol butyl ether, alcohol ester lauryl ether, and propylene glycol phenyl ether.

10. The method for preparing the anti-mildew and anti-condensation environmentally friendly coating according to any one of claims 1 to 9, characterized in that: The following steps are involved: After the raw materials are evenly mixed, a mildew-proof and condensation-proof environment-friendly coating is obtained.

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