Coating with waterproof and decorative properties and application thereof

Abstract

The invention provides a coating with waterproof and decorative properties and application thereof. The coating comprises an acrylic emulsion and gel powder, the gel powder comprises silicate and aluminate; the acrylic emulsion is prepared from the following raw materials in percentage by mass: 10 to 30 percent of methyl methacrylate, 30 to 50 percent of butyl acrylate, 30 to 50 percent of 2-ethylhexyl acrylate and 0.1 to 3 percent of functional monomer; wherein the functional monomer comprises isonicotinic acid hydrazine, acrylic acid and acrylamide. By controlling the ratio of the main monomer materials, the structure of the formed acrylic emulsion can be controlled, so that the waterproofness of the coating is regulated and controlled; the gel powder is matched, so that the coating is endowed with good decorative performance.

Description

Technical Field

[0001] The invention belongs to the field of building materials, and in particular relates to a coating having both waterproof and decorative properties and application thereof. Background Art

[0002] In the current field of building materials, it is difficult to provide a coating product that combines a waterproof layer and a decorative layer. Although the products that currently meet the industry standard "JC / T 2090-2011 Polymer Cement Waterproofing Slurry" have met the requirements of waterproof performance in terms of anti-seepage pressure and impermeability, they usually have problems such as difficulty in coloring, easy alkali blooming, poor stain resistance, and poor resistance to artificial weathering and aging. Therefore, they can only be used as a waterproof functional layer and are difficult to be applied to the decorative layer of architectural coatings. On the other hand, products that meet the industry standard "JG / T 24-2018 Synthetic Resin Emulsion Sand Wall Architectural Coatings" can meet the requirements of decorative water resistance, alkali resistance, coating temperature change resistance, stain resistance, and artificial weathering and aging resistance, but often do not have waterproof performance in terms of anti-seepage pressure and impermeability.

[0003] Therefore, in the current field of building materials, waterproofing projects and decoration projects are relatively independent projects. They should be carried out in the order of waterproofing first and then decoration to achieve the comprehensive effect of both waterproofing and decorative performance.

[0004] However, in traditional construction projects, the process of "waterproofing first and then decorating" is complicated, requiring not only a long construction time but also multiple coats of coating, which will increase the overall cost of the project. Summary of the invention

[0005] In order to reduce the construction time, the present invention provides a coating having both waterproof and decorative properties and application thereof.

[0006] According to one aspect of the present invention, a coating having both waterproof and decorative properties and its application are provided. The coating comprises acrylic emulsion and gel powder; the gel powder comprises silicate and aluminate; calculated by mass percentage, raw materials for preparing the acrylic emulsion comprise 10-30% methyl methacrylate, 30-50% butyl acrylate, 30-50% isooctyl acrylate, and 0.1-3% functional monomer; wherein the functional monomer comprises isonicotinate hydrazine.

[0007] The present invention can control the monomer arrangement of the formed acrylic emulsion by controlling the proportion (methyl methacrylate, butyl acrylate, isooctyl acrylate) between the main monomer materials and the feeding order of emulsion polymerization. This is because the proportion between the main monomer materials and the timing of participating in polymerization will affect the arrangement order of monomers on the polymerized polymer chain, and the arrangement order of the polymerized polymer chain will not only affect the water resistance of the coating, but also affect the dispersion effect of the gel powder in the emulsion, thereby affecting the decorative performance of the coating. This is due to the polymerized polymer chain formed by a specific ratio can form an intermolecular force between silicates and aluminates, and then form a good dispersion effect between the acrylic emulsion provided by the present invention and the gel powder, thereby giving the emulsion good decorative performance. In addition, by utilizing the pyridine structure in isonicotinic acid hydrazine, the molecular chain can be given higher hydrophobicity and water resistance, and the water resistance of the coating can be further enhanced. In addition, the use of acrylic acid and acrylamide can not only make the main monomer material remain stable during the synthesis process, but also allow the obtained emulsion to be stably stored, and can also improve the synergistic film-forming performance between the emulsion and the gel powder.

[0008] Preferably, the mass content of isonicotinic acid hydrazine in the raw materials for preparing the acrylic emulsion is 0.1-1%.

[0009] Preferably, the functional monomer further includes at least one of acrylic acid and acrylamide.

[0010] Preferably, the silicate comprises at least one of calcium silicate, aluminum silicate, magnesium silicate and calcium aluminosilicate; and / or the aluminate comprises calcium aluminate. By introducing suitable silicates and aluminates, the appearance and coloring effect of the coating film formed by the coating can be improved.

[0011] Preferably, the preparation of gel powder comprises the following steps: grinding metal oxide and silicon dioxide, and then calcining at 500-1000° C. to obtain gel powder. The formed gel powder has the characteristics of high coating hardness, wear resistance, alkali resistance, and easy color adjustment, which solves the problem of difficult color adjustment and easy alkali efflux of conventional inorganic salt gel materials.

[0012] Preferably, the metal oxides include calcium oxide, magnesium oxide and aluminum oxide; calculated by mass ratio, the calcium oxide: magnesium oxide: aluminum oxide: silicon dioxide = 10-30: 10-30: 10-30: 10-30: 10-30.

[0013] Preferably, the raw materials for preparing the acrylic emulsion further include 0.1-3% of an emulsifier, and the emulsifier includes at least one of sodium vinyl sulfonate, sodium allyloxyhydroxypropane sulfonate, and alkylphenol allyl polyether sulfate.

[0014] Preferably, the emulsifier includes sodium vinyl sulfonate, sodium allyloxyhydroxypropane sulfonate, alkylphenol allyl polyether sulfate.

[0015] Preferably, calculated by mass ratio, sodium vinyl sulfonate: sodium allyloxyhydroxypropane sulfonate: alkylphenol allyl polyether sulfate = 0.1-1: 0.1-1: 0.1-1.

[0016] Preferably, the raw materials for preparing the acrylic emulsion further include 0.1-1% of an initiator, and the initiator includes sodium persulfate.

[0017] Preferably, the coating further comprises a filler, and calculated by weight, the coating comprises 200 to 500 parts of acrylic emulsion, 100 to 300 parts of gel powder, and 200 to 700 parts of filler.

[0018] Preferably, the filler includes at least one of titanium dioxide, kaolin, calcium carbonate powder and natural sand. By mixing the filler, the compactness of the coating can be enhanced and the coating will not crack.

[0019] Preferably, the coating further includes 0 to 20 parts of a retarder, calculated by weight. The retarder can adjust the viscosity stability and open time of the coating so that the coating has a suitable and stable viscosity within a predetermined time.

[0020] Preferably, the coating also includes 0 to 20 parts of a thickener, calculated by weight. The thickener can make the coating have a suitable viscosity to meet the requirements of construction and anti-settling.

[0021] Preferably, the thickener comprises at least one of cellulose ether and alkali swellable thickener.

[0022] Preferably, the cellulose ether includes at least one of hydroxyethyl cellulose ether, hydroxypropyl methyl cellulose ether, and hydrophobically modified cellulose ether.

[0023] Preferably, the alkali-swellable thickener includes at least one of an alkali-swellable thickener and an alkali-swellable associative thickener.

[0024] Preferably, the coating further comprises 0 to 20 parts of a wetting agent, calculated by weight, and the wetting agent comprises at least one of an organosilicon wetting agent, an anionic wetting agent, and a nonionic wetting agent.

[0025] Preferably, the coating further comprises 0 to 20 parts of a dispersant, calculated by weight, and the dispersant comprises at least one of a polyacrylate dispersant, a polyurethane dispersant, and a phosphate dispersant.

[0026] By using wetting agents or dispersants, fillers and colorants in the paint can be evenly dispersed, flocculation can be reduced, and the adhesion of the paint to the substrate can be increased.

[0027] Preferably, the coating further comprises 0 to 80 parts of antifreeze agent, calculated by weight, and the antifreeze agent comprises at least one of ethylene glycol and propylene glycol. The antifreeze agent is used so that the coating can still maintain a good state and have no obvious loss of performance after experiencing a certain degree of low temperature.

[0028] Preferably, the coating further comprises 0 to 80 parts of a film-forming aid, calculated by weight, and the film-forming aid comprises at least one of 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, 2,2,4-trimethyl-1,3-pentanediol diisobutyrate, ethylene glycol butyl ether, and diethylene glycol butyl ether. By using a film-forming aid, the coating can form a film at an air temperature above 5°C, meeting a certain degree of low-temperature construction requirements.

[0029] Preferably, the coating further comprises 0 to 20 parts of a defoamer, calculated by weight, and the defoamer comprises at least one of a mineral oil defoamer, a polyether defoamer, and a silicone defoamer. The defoamer is used to reduce bubbles in the coating and improve the density of the paint film.

[0030] Preferably, the coating further comprises 0 to 20 parts of a bactericide, calculated by weight, wherein the bactericide comprises at least one of an oxidizing bactericide and a non-oxidizing bactericide. The bactericide is used to prevent corruption and prolong the storage time of the coating.

[0031] Preferably, the oxidizing sterilant comprises hydrogen peroxide.

[0032] Preferably, the non-oxidizing biocide comprises an isothiazolinone.

[0033] Preferably, the coating further comprises 0 to 20 parts of a pH regulator, calculated by weight, and the pH regulator comprises an inorganic regulator and an organic amine regulator. The pH regulator is used to thicken the cellulose ether and the alkali swelling thickener.

[0034] Preferably, the inorganic regulator includes at least one of sodium hydroxide (NaOH) and potassium hydroxide (KOH).

[0035] Another aspect of the present invention provides an application of the above in the field of building materials. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments 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 creative work should fall within the scope of protection of the present invention.

[0037] Example 1

[0038] 1. Raw materials needed to prepare coatings

[0039] In this embodiment, the coating is prepared according to the formula provided in Table 1.

[0040] Table 1. Raw materials required for preparing the coating in this example

[0041]

[0042]

[0043] 2. Method for preparing coating

[0044] (1) Acrylic emulsion

[0045] According to the mass percentage, 17% methyl methacrylate, 40% butyl acrylate, 40% isooctyl acrylate, 0.5% acrylic acid, 0.5% acrylamide, 1% isonicotinoic acid hydrazine, 0.2% sodium vinyl sulfonate, 0.2% sodium allyloxyhydroxypropane sulfonate, 0.1% alkylphenol allyl polyether sulfate, and 0.5% sodium persulfate are taken as raw materials for preparing acrylic emulsion. The raw materials are emulsion-polymerized at 70° C. to 95° C. to obtain acrylic emulsion.

[0046] (2) Gel powder

[0047] According to the mass percentage, 20% calcium oxide, 30% magnesium oxide, 20% aluminum oxide and 30% silicon dioxide are taken as raw materials for preparing gel powder. The raw materials are mixed and ground, and then calcined at 700-1400° C. for 180-300 minutes to obtain gel powder.

[0048] (3) Paint

[0049] According to Table 1, prepare the required materials to obtain liquid and powder.

[0050] The order of feeding liquid and powder is as shown in Table 1.

[0051] Specifically, the steps of preparing the liquid material are: while stirring at a speed of 50 to 100 rpm in water, add an alkali swelling thickener, a wetting agent, a dispersant, an antifreeze agent, a film-forming aid, a defoaming agent, a bactericide, and an acrylic emulsion in sequence; then increase the stirring speed to 200 to 300 rpm, add cellulose ether, mica powder, titanium dioxide, and a pH adjuster to obtain a liquid material.

[0052] Specifically, the step of preparing the powder is: mixing the powder formula materials shown in Table 1.

[0053] Specifically, the steps of preparing the coating are: pouring the powder into the liquid, and then stirring at a speed of 100 to 200 revolutions per minute for 5 minutes to obtain the coating.

[0054] Example 2

[0055] This example prepares acrylic emulsion, gel powder and emulsion with reference to the formula and method provided in Example 1. The difference from Example 1 is that when preparing the acrylic emulsion, the mass ratio of methyl methacrylate, butyl acrylate and isooctyl acrylate is 1:3:3 (the total mass fraction remains unchanged). Except for the above difference, the operation steps for preparing the acrylic emulsion, gel powder and emulsion in this example are strictly consistent with those in Example 1.

[0056] Example 3

[0057] This example prepares acrylic emulsion, gel powder and emulsion with reference to the formula and method provided in Example 1. The difference from Example 1 is that when preparing the acrylic emulsion, the mass ratio of methyl methacrylate, butyl acrylate and isooctyl acrylate is 1:3:3 (the total mass fraction remains unchanged). Except for the above difference, the operation steps for preparing the acrylic emulsion, gel powder and emulsion in this example are strictly consistent with those in Example 1.

[0058] Example 4

[0059] This example prepares acrylic emulsion, gel powder and emulsion with reference to the formula and method provided in Example 1. The difference from Example 1 is that when preparing the acrylic emulsion in this example, the content of isonicotinic acid hydrazine is 1% (the total mass fraction remains unchanged). Except for the above difference, the operation steps for preparing the acrylic emulsion, gel powder and emulsion in this example are strictly consistent with those in Example 1.

[0060] Example 5

[0061] This example prepares acrylic emulsion, gel powder and emulsion with reference to the formula and method provided in Example 1. The difference from Example 1 is that when preparing the acrylic emulsion in this example, the content of isonicotinic acid hydrazine is 3% (the total mass fraction remains unchanged). Except for the above difference, the operation steps for preparing the acrylic emulsion, gel powder and emulsion in this example are strictly consistent with those in Example 1.

[0062] Example 6

[0063] This example prepares acrylic emulsion, gel powder, and emulsion with reference to the formula and method provided in Example 1. The difference from Example 1 is that, when preparing the acrylic emulsion, acrylamide is used in equal parts by mass to replace acrylic acid. Except for the above differences, the operating steps for preparing the acrylic emulsion, gel powder, and emulsion in this example are strictly consistent with those in Example 1.

[0064] Example 7

[0065] This example prepares acrylic emulsion, gel powder, and emulsion with reference to the formula and method provided in Example 1. The difference from Example 1 is that, when preparing the acrylic emulsion, this example uses acrylic acid in equal parts by mass to replace acrylamide. Except for the above differences, the operating steps for preparing the acrylic emulsion, gel powder, and emulsion in this example are strictly consistent with those in Example 1.

[0066] Example 8

[0067] This example prepares acrylic emulsion, gel powder, and emulsion with reference to the formula and method provided in Example 1. The difference from Example 1 is that in the preparation of gel powder, this example uses an equal mass fraction of sodium chloride instead of calcium oxide. Except for the above difference, the operation steps for preparing acrylic emulsion, gel powder, and emulsion in this example are strictly consistent with those in Example 1.

[0068] Example 9

[0069] This example prepares acrylic emulsion, gel powder, and emulsion with reference to the formula and method provided in Example 1. The difference from Example 1 is that in the preparation of gel powder, calcium oxide is replaced by iron oxide in equal parts by mass. Except for the above differences, the operating steps for preparing acrylic emulsion, gel powder, and emulsion in this example are strictly consistent with those in Example 1.

[0070] Example 10

[0071] This example prepares acrylic emulsion, gel powder, and emulsion with reference to the formula and method provided in Example 1. The difference from Example 1 is that when preparing the gel powder, this example uses equal parts of magnesium oxide and aluminum oxide to replace calcium oxide (wherein the mass ratio of magnesium oxide to aluminum oxide is 30:20). Except for the above differences, the operating steps for preparing acrylic emulsion, gel powder, and emulsion in this example are strictly consistent with those in Example 1.

[0072] Embodiment 11

[0073] This example prepares acrylic emulsion, gel powder, and emulsion with reference to the formula and method provided in Example 1. The difference from Example 1 is that when preparing the gel powder, this example uses equal parts of calcium oxide and aluminum oxide to replace magnesium oxide (wherein the mass ratio of calcium oxide to aluminum oxide is 20:20). Except for the above differences, the operating steps for preparing acrylic emulsion, gel powder, and emulsion in this example are strictly consistent with those in Example 1.

[0074] Example 12

[0075] This example prepares acrylic emulsion, gel powder, and emulsion with reference to the formula and method provided in Example 1. The difference from Example 1 is that when preparing the gel powder, this example uses equal parts of calcium oxide and magnesium oxide to replace aluminum oxide (wherein the mass ratio of calcium oxide to magnesium oxide is 20:30). Except for the above differences, the operating steps for preparing acrylic emulsion, gel powder, and emulsion in this example are strictly consistent with those in Example 1.

[0076] Example 13

[0077] This example prepares acrylic emulsion, gel powder, and emulsion with reference to the formula and method provided in Example 1. The difference from Example 1 is that when preparing gel powder in this example, the mass ratio of calcium oxide, magnesium oxide, and aluminum oxide is 50:30:20 (the total mass fraction remains unchanged). Except for the above differences, the operation steps for preparing acrylic emulsion, gel powder, and emulsion in this example are strictly consistent with those in Example 1.

[0078] Embodiment 14

[0079] This example prepares acrylic emulsion, gel powder, and emulsion with reference to the formula and method provided in Example 1. The difference from Example 1 is that when preparing gel powder in this example, the mass ratio of calcium oxide, magnesium oxide, and aluminum oxide is 20:50:20 (the total mass fraction remains unchanged). Except for the above differences, the operation steps for preparing acrylic emulsion, gel powder, and emulsion in this example are strictly consistent with those in Example 1.

[0080] Embodiment 15

[0081] This example prepares acrylic emulsion, gel powder, and emulsion with reference to the formula and method provided in Example 1. The difference from Example 1 is that when preparing gel powder in this example, the mass ratio of calcium oxide, magnesium oxide, and aluminum oxide is 20:30:50 (the total mass fraction remains unchanged). Except for the above differences, the operation steps for preparing acrylic emulsion, gel powder, and emulsion in this example are strictly consistent with those in Example 1.

[0082] Comparative Example 1

[0083] This comparative example prepares acrylic emulsion, gel powder and emulsion with reference to the formula and method provided in Example 1. The difference from Example 1 is that, when preparing the acrylic emulsion, this comparative example uses equal parts by mass of butyl acrylate and isooctyl acrylate to replace methyl methacrylate (the mass ratio of butyl acrylate to isooctyl acrylate is 40:40). Except for the above differences, the operation steps for preparing the acrylic emulsion, gel powder and emulsion in this comparative example are strictly consistent with those in Example 1.

[0084] Comparative Example 2

[0085] This comparative example prepares acrylic emulsion, gel powder and emulsion with reference to the formula and method provided in Example 1. The difference from Example 1 is that, when preparing the acrylic emulsion, this comparative example uses equal parts of methyl methacrylate and isooctyl acrylate to replace butyl acrylate (the mass ratio of methyl methacrylate to isooctyl acrylate is 17:40). Except for the above differences, the operation steps for preparing the acrylic emulsion, gel powder and emulsion in this comparative example are strictly consistent with those in Example 1.

[0086] Comparative Example 3

[0087] This comparative example prepares acrylic emulsion, gel powder and emulsion with reference to the formula and method provided in Example 1. The difference from Example 1 is that when preparing the acrylic emulsion, this comparative example uses equal parts by mass of methyl methacrylate and butyl acrylate to replace isooctyl acrylate (the mass ratio of methyl methacrylate to butyl acrylate is 17:40). Except for the above differences, the operation steps for preparing the acrylic emulsion, gel powder and emulsion in this comparative example are strictly consistent with those in Example 1.

[0088] Comparative Example 4

[0089] This comparative example prepares acrylic emulsion, gel powder and emulsion with reference to the formula and method provided in Example 1. The difference from Example 1 is that when preparing acrylic emulsion in this comparative example, the mass ratio of methyl methacrylate, butyl acrylate and isooctyl acrylate is 60:20:20. Except for the above difference, the operation steps of preparing acrylic emulsion, gel powder and emulsion in this comparative example are strictly consistent with those in Example 1.

[0090] Comparative Example 5

[0091] This comparative example prepares acrylic emulsion, gel powder, and emulsion with reference to the formula and method provided in Example 1. The difference from Example 1 is that isonicotinic acid hydrazine is not added when preparing the acrylic emulsion. Except for the above difference, the operation steps for preparing acrylic emulsion, gel powder, and emulsion in this comparative example are strictly consistent with those in Example 1.

[0092] Comparative Example 6

[0093] This comparative example prepares acrylic emulsion, gel powder, and emulsion with reference to the formula and method provided in Example 1. The difference from Example 1 is that when preparing the gel powder, this comparative example does not add silicon dioxide for calcination. Except for the above difference, the operation steps for preparing acrylic emulsion, gel powder, and emulsion in this comparative example are strictly consistent with those in Example 1.

[0094] Comparative Example 7

[0095] This comparative example prepares acrylic emulsion, gel powder, and emulsion with reference to the formula and method provided in Example 1. The difference from Example 1 is that when preparing the gel powder, this comparative example does not add alumina for calcination. Except for the above difference, the operation steps for preparing acrylic emulsion, gel powder, and emulsion in this comparative example are strictly consistent with those in Example 1.

[0096] Test Case

[0097] 1. Test subjects

[0098] The coatings prepared in Examples 1 to 15 and Comparative Examples 1 to 7.

[0099] 2. Test Method

[0100] (1) Water resistance: Tested in accordance with the Type II anti-seepage pressure and water-impermeability requirements of "JC / T 2090-2011 Polymer Cement Waterproof Slurry"; "O" indicates that the performance of the test object meets the technical indicators, and "X" indicates that the performance of the test object does not meet the technical indicators. The specific technical indicators are as follows: anti-seepage pressure is 1.0MPa, and water-impermeability is impermeable.

[0101] (2) Decorative properties: Tested in accordance with the performance requirements of water resistance, alkali resistance, coating temperature change resistance, stain resistance, and artificial weathering resistance in "JG / T 24-2018 Synthetic Resin Emulsion Sand Wall Architectural Coatings"; "O" indicates that the performance of the test object meets the technical indicators, and "X" indicates that the performance of the test object does not meet the technical indicators. The specific technical indicators are as follows: water resistance is no abnormality for 96 hours; alkali resistance is no abnormality for 96 hours; coating temperature change resistance is no abnormality; stain resistance is ≤ Level 2; artificial weathering resistance is 600 hours, the coating does not crack, bulge, or peel, chalking is Level 0, and discoloration is ≤ Level 1.

[0102] 3. Test results and analysis

[0103] The results of this test case are shown in Table 2.

[0104] By comparing the data of Examples 1 to 3 and Comparative Examples 1 to 4, it can be seen that in acrylic emulsion, using methyl methacrylate, butyl acrylate, and isooctyl acrylate as main monomers to prepare acrylic emulsion is helpful to improve the film-forming property and flexibility of the coating; further, when the mass ratio of methyl methacrylate, butyl acrylate, and isooctyl acrylate is maintained at 10-30:30-50:30-50, the film-forming property of the emulsion can be improved, thereby giving the emulsion good water resistance, and not only that, but also the dispersion effect of gel powder in acrylic emulsion can be improved, thereby giving the coating good decorative properties. Furthermore, by increasing the content of hard monomers in acrylic emulsion, the mechanical properties of the coating can be improved, thereby enhancing the stain resistance.

[0105] The data of Example 1, Example 4 to Example 5 and Comparative Example 5 prove that isonicotinic acid hydrazine can give the molecular chain higher hydrophobicity and water resistance, thereby further enhancing the waterproofness of the coating. In addition, its content in the acrylic emulsion will also affect the waterproof performance of the coating. However, when the mass content of isonicotinic acid hydrazine in the preparation of acrylic emulsion is too high, its aging resistance will be affected.

[0106] Combining Example 1, Example 6 and Example 7, it can be explained that the main function of acrylic acid and acrylamide is to improve the stability of the main monomer material during the synthesis process and the storage process. Although the anti-seepage pressure can be improved when acrylic acid is not added, this is because acrylic acid is hydrophilic, and not adding acrylic acid can reduce the hydrophilicity and thus give it good anti-seepage pressure performance, but not introducing acrylic acid and acrylamide is likely to affect the long-term storage performance of the coating.

[0107] It can be found in Example 1 and Example 8 to Example 9 that the introduction of sodium ions (or lithium ions, potassium ions) will produce soluble salts, affecting the appearance of the coating; while the introduction of iron ions (or copper ions) will bring color to the coating, thereby affecting the color adjustment application in the actual production process.

[0108] It is demonstrated in Example 1, Example 10 to Example 15 and Comparative Examples 6 to Comparative Examples 7 that maintaining a specific ratio between metal oxides in gel powder helps to enhance the decorative effect of the coating and improve the anti-penetration performance, water resistance and alkali resistance of the coating.

[0109] Table 2. Test results of test cases

[0110] Group Anti-seepage pressure Waterproof Water resistance Alkali resistance Temperature resistance Stain resistance Aging resistance Example 1 1.3MPa O O O O Level 2 O Example 2 1.2MPa O O O O Level 2 O Example 3 1.4MPa O O O O Level 1 O Example 4 1.3MPa O O O O Level 2 O Example 5 1.4MPa O O O O Level 2 X Example 6 1.5MPa O O O O Level 2 O Example 7 1.3MPa O O O O Level 2 O Example 8 1.1MPa O O X O Level 2 X Example 9 1.3MPa O O X O Level 2 X Example 10 0.9MPa X O O O Level 2 O Embodiment 11 1.1MPa O O O O Level 2 O Example 12 0.8MPa X O O O Level 2 O Example 13 1.2MPa O X X O Level 2 O Embodiment 14 1.3MPa O O O O Level 2 O Embodiment 15 1.3MPa O O O O Level 2 O Comparative Example 1 1.4MPa O O O O Level 3 O Comparative Example 2 1.3MPa X O O O Level 2 O Comparative Example 3 1.3MPa X O O O Level 2 O Comparative Example 4 1.3MPa X O O O Level 2 O Comparative Example 5 0.9MPa O O O O Level 2 O Comparative Example 6 0.5MPa X O O O Level 3 O Comparative Example 7 0.9MPa X O O O Level 2 O

[0111] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A coating having both waterproof and decorative properties, characterized in that: The coating comprises acrylic emulsion and gel powder; the gel powder comprises silicate and aluminate; Calculated by mass percentage, the raw materials for preparing the acrylic emulsion include 10-30% methyl methacrylate, 30-50% butyl acrylate, 30-50% isooctyl acrylate, and 0.1-3% functional monomers; wherein the functional monomers include isonicotinoic acid hydrazine.

2. The coating according to claim 1, characterized in that: The mass content of the isonicotinic acid hydrazine in the raw material of the acrylic emulsion is 0.1-1%.

3. The coating according to claim 1, characterized in that: The functional monomer further comprises at least one of acrylic acid and acrylamide.

4. The coating according to claim 1, characterized in that: The silicate comprises at least one of calcium silicate, aluminum silicate, magnesium silicate, and calcium aluminosilicate; and / or the aluminate comprises calcium aluminate.

5. The coating according to claim 4, characterized in that: The preparation of the gel powder comprises the following steps: grinding the metal oxide and silicon dioxide, and then calcining them at 500-1000° C. to obtain the gel powder.

6. The coating according to claim 5, characterized in that: The metal oxides include calcium oxide, magnesium oxide and aluminum oxide; calculated by mass ratio, the calcium oxide: the magnesium oxide: the aluminum oxide: the silicon dioxide=10-30:10-30:10-30:10-30:10-30.

7. The coating according to claim 1, characterized in that: The raw materials for preparing the acrylic emulsion also include an emulsifier, and the emulsifier includes at least one of sodium vinyl sulfonate, sodium allyloxyhydroxypropane sulfonate, and alkylphenol allyl polyether sulfate.

8. The coating according to claim 7, characterized in that: The emulsifier includes the sodium vinyl sulfonate, the sodium allyloxyhydroxypropane sulfonate, and the alkylphenol allyl polyether sulfate.

9. The coating according to claim 1, characterized in that: The coating also includes a filler, and, calculated by weight, the coating includes 200 to 500 parts of the acrylic emulsion, 100 to 300 parts of the gel powder, and 200 to 700 parts of the filler.

10. Use of the coating according to any one of claims 1 to 9 in the field of building materials.

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