Two-component waterproof real stone paint and preparation method thereof

Abstract

This application relates to the field of building decoration materials, particularly a two-component waterproof natural stone paint and its preparation method. The two-component waterproof natural stone paint comprises components A and B. Component A comprises the following raw materials in weight percentage: 30-40% pure acrylic emulsion, 1-5% pigment, 0.2-1% wetting and dispersing agent, 0.2-1% defoamer, 0.2-2% thickener, 0.1-1% pH adjuster, 0.1-0.2% bactericide and preservative, 0.5-2% film-forming aid, 40-60% aggregate, and the balance water; component B is low-alkali cement; and the weight ratio of components A to B is (9.5-10.5):1. The resulting coating has a water absorption as low as 1.02-0.01 g / 2h, a water resistance of 290-420h, and an alkali resistance of 102-120h.

Description

Technical Field

[0001] The present application relates to the field of building decoration materials, and in particular to a two-component waterproof real stone paint and a preparation method thereof. Background Art

[0002] Real stone paint is a coating that creates the decorative effect of natural stone. Its rich colors and strong colorability create a harmonious and elegant architectural atmosphere. Its strong fire and corrosion resistance and wider environmental adaptability compared to traditional architectural coatings make it widely used on exterior walls. As one of the fastest-growing exterior wall paints, real stone paint is gaining increasing popularity.

[0003] Real stone paint is generally composed of an emulsion component, natural coloring stone powder, functional additives, and water. The ratio of these raw materials affects the performance and quality of the real stone paint. Currently, a common problem with real stone paint coatings on the market is poor waterproofing. Real stone paint is typically applied to building facades, where it is frequently exposed to rain. This poor waterproofing can lead to bubbling and shedding after being soaked in rain, compromising its effectiveness in practical applications and posing a safety hazard. Therefore, developing a real stone paint with excellent waterproofing properties is a current research priority. Summary of the Invention

[0004] In order to improve the waterproof performance of real stone paint and reduce the probability of bulging and falling off of real stone paint, the present application provides a two-component waterproof real stone paint and a preparation method thereof.

[0005] In a first aspect, the present application provides a waterproof real stone paint, which adopts the following technical solution.

[0006] A two-component waterproof real stone paint, including component A and component B:

[0007] The component A comprises the following raw materials in weight percentage: 30-40% pure acrylic emulsion, 1-5% pigment, 0.2-1% wetting and dispersing agent, 0.2-1% defoaming agent, 0.2-2% thickener, 0.1-1% pH regulator, 0.1-0.2% bactericide and preservative, 0.5-2% film-forming aid, 40-60% aggregate, and the balance is water;

[0008] The B component is low-alkali cement;

[0009] The weight ratio of component A to component B is (9.5-10.5):1.

[0010] By adopting the above technical solution, pure acrylic emulsion is used as a film-forming substance, and additives such as wetting dispersants, defoaming agents, thickeners, pH regulators, bactericidal preservatives, and film-forming aids are used as functional additives to adjust the performance of the coating.

[0011] Low-alkali cement is used as the B component and mixed with the A component to prepare the real stone paint. The inherent high strength and hardness characteristics of cement enable the real stone paint to form a hard coating after curing. This coating can not only effectively resist the physical impact of the outside world, but also maintain the stability and durability of the coating. At the same time, the addition of cement also increases the viscosity of the real stone paint, allowing the real stone paint to better adhere to the wall surface during construction, not easy to flow or drip, and improve construction efficiency and quality. Secondly, the hardening process of cement is a chemical reaction process, and its reaction speed is affected by many factors. The addition of cement in this application can indirectly regulate the curing speed of the real stone paint. This helps construction personnel to better control the drying time and curing degree of the coating during construction, ensuring the quality of the coating. Finally, the addition of cement can prevent moisture from penetrating into the coating to a certain extent, enhance the waterproof performance of the coating, reduce the probability of the coating bulging and falling off under rain erosion, and protect the wall surface from erosion by natural factors such as rain.

[0012] Furthermore, the aggregate is natural colored sand, including natural colored sand with a particle size of 40-80 mesh and natural colored sand with a particle size of 80-120 mesh.

[0013] Furthermore, the weight ratio of the natural colored sand with a particle size of 40-80 meshes to the natural colored sand with a particle size of 80-120 meshes is 1:(2-3).

[0014] By adopting the above technical solution, the aggregate is reasonably graded so that the aggregate particles inside the coating are evenly distributed, filling the pores and not easily absorbing water and expanding, thereby further improving the waterproof effect of the coating.

[0015] Furthermore, the aggregate is a modified aggregate whose surface has been modified by epoxy resin-siloxane hybrid polymer.

[0016] By adopting the above technical solution, the epoxy-silicone hybrid polymer is a new polymer material that combines the properties of both epoxy and siloxane. It chemically bonds the mechanical strength, chemical resistance, and adhesion of epoxy resin with the low surface energy of siloxane, resulting in a hybrid material with excellent overall performance. Modifying aggregate with the epoxy-silicone hybrid polymer creates a waterproof layer on the aggregate surface. This layer effectively blocks water penetration and reduces water absorption, thereby enhancing the water resistance of the coating. It also improves the compatibility of the aggregate with pure acrylic emulsion, further enhancing the overall performance of the coating.

[0017] Furthermore, the preparation method of the epoxy resin-siloxane hybrid polymer is:

[0018] 1) Prepolymerization

[0019] Dissolve polydimethylsiloxane and epoxy resin in a solvent, then add a catalyst, and react at 80-120°C for 2-4 hours to obtain a prepolymer;

[0020] 2) Curing reaction

[0021] Add a curing agent to the prepolymer and react at 120-180° C. for 2-6 hours to obtain an epoxy resin-siloxane hybrid polymer.

[0022] Furthermore, the epoxy resin is a perfluoropolyether modified epoxy resin, and its preparation method is:

[0023] a) Activation of perfluoropolyether

[0024] Perfluoropolyether is added to a solvent to form a perfluoropolyether solution, and then sodium hydroxide and methanol are added to react at 50-60° C. for 2-4 hours to obtain hydroxy-perfluoropolyether;

[0025] b) Grafting reaction

[0026] adding hydroxyl-perfluoropolyether to a solvent to form a hydroxyl-perfluoropolyether solution, then adding epoxy resin, and reacting at 80-100° C. for 2-4 hours to obtain a reaction product;

[0027] c) Post-processing

[0028] The reaction product is washed and dried to obtain a perfluoropolyether modified epoxy resin.

[0029] By adopting the above technical solution, hydroxyl groups are introduced into the perfluoropolyether through activation. The hydroxyl groups can undergo a ring-opening reaction with the epoxy groups of the epoxy resin to form ether bonds, thereby achieving grafting. The epoxy resin is fluorine-modified to form a fluorocarbon chain structure. This structure has extremely low surface energy, thereby significantly improving the hydrophobicity of the material.

[0030] Fluorine modification is an effective method to improve the hydrophobic properties of materials. By adding a certain amount of fluorine compounds to epoxy resin-siloxane hybrid polymers, a fluorocarbon chain structure can be formed. This structure has extremely low surface energy, thereby significantly improving the hydrophobicity and oil resistance of the material.

[0031] Furthermore, the modified aggregate is prepared by spraying the epoxy resin-siloxane hybrid polymer on the aggregate, so that the surface of the aggregate is covered with a layer of the epoxy resin-siloxane hybrid polymer.

[0032] Furthermore, the wetting and dispersing agent is one of polycarboxylic acid-alkyl ammonium salt or unsaturated fatty acid polyamine amide;

[0033] The film-forming aid is one of ethylene glycol or dodecyl alcohol ester film-forming aids or a combination thereof;

[0034] The defoaming agent is selected from any one of silicone, mineral oil or polyether modified defoaming agents;

[0035] The thickener is one of a hydrophobically modified alkali swelling rheology regulator, a polyurethane thickener, a cellulose thickener, a bentonite thickener or a combination thereof.

[0036] The pH regulator is any one of 2-amino-2-methyl-1-propanol, ammonia water, and dimethylethanolamine.

[0037] In a second aspect, the present application provides a method for preparing a two-component waterproof real stone paint, which adopts the following technical solution.

[0038] A method for preparing a two-component waterproof real stone paint comprises the following steps:

[0039] S1. The pure acrylic emulsion, pigment, wetting and dispersing agent, defoamer, thickener, pH adjuster, bactericidal preservative, film-forming agent, aggregate and water are mixed and stirred to obtain component A;

[0040] S2. Stir the low-alkali cement to obtain component B;

[0041] S3. Mix component A and component B according to the weight ratio and stir evenly to obtain a two-component waterproof real stone paint.

[0042] In summary, this application has the following beneficial effects:

[0043] 1. Use pure acrylic emulsion as film-forming substance and add low-alkali cement. The addition of mixed cement increases the viscosity of real stone paint, making it easier for real stone paint to adhere to the wall surface during construction and less prone to dripping, thereby improving construction efficiency and quality. Secondly, the hardening process of cement is a chemical reaction process, and its reaction speed is affected by many factors. The addition of cement in this application can indirectly regulate the curing speed of real stone paint. This helps construction workers better control the drying time and curing degree of the coating during construction and ensure the quality of the coating. Finally, the addition of cement can prevent moisture from penetrating into the coating to a certain extent, enhance the waterproof performance of the coating, reduce the probability of bulging and falling off of the coating under rain erosion, and protect the wall surface from erosion by natural factors such as rain. The water absorption of the resulting coating is as low as 1.02-0.01g / 2h, and the water resistance can reach 290-420h, and the alkali resistance can reach 102-120h.

[0044] 2. The aggregate is modified with epoxy resin-siloxane hybrid polymer to further improve the waterproof performance of the coating. The water absorption of the obtained coating is as low as 0.03-0.01g / 2h, the water resistance can reach 390-420h, and the alkali resistance can reach 120h. DETAILED DESCRIPTION

[0045] The present application is further described in detail below with reference to the embodiments.

[0046] Preparation examples of raw materials and intermediates

[0047] raw material

[0048] Pure acrylic emulsion, brand BA201;

[0049] Pigment, rutile titanium dioxide;

[0050] Low alkali cement is white low alkali cement with a total alkali content of 0.5%, silicate cement;

[0051] Perfluoropolyether, brand FC-3135;

[0052] Epoxy resin, bisphenol A epoxy resin E-44.

[0053] Preparation Example

[0054] Preparation Example 1

[0055] A perfluoropolyether modified epoxy resin, the preparation method of which is as follows:

[0056] a) Activation of perfluoropolyether

[0057] 1 kg of perfluoropolyether was added to 25 L of DMF solvent and stirred to dissolve the perfluoropolyether to form a perfluoropolyether solution. Then, 0.075 kg of sodium hydroxide and 1 kg of methanol were added and reacted at 55° C. for 3 h to obtain hydroxy-perfluoropolyether.

[0058] b) Grafting reaction

[0059] The hydroxyl-perfluoropolyether was added to 25 L of DMF solvent to form a hydroxyl-perfluoropolyether solution, and then 10 kg of epoxy resin was added and reacted at 90° C. for 3 h to obtain a reaction product;

[0060] c) Post-processing

[0061] The reaction product is washed and dried to obtain a perfluoropolyether modified epoxy resin.

[0062] Preparation Example II-1

[0063] An epoxy resin-siloxane hybrid polymer, the preparation method of which is as follows:

[0064] 1) Prepolymerization

[0065] 30 kg of polydimethylsiloxane and 70 kg of epoxy resin were dissolved in toluene solvent, and then 1.5 kg of N,N-dimethylbenzylamine catalyst was added and reacted at 100° C. for 3 hours to obtain a prepolymer;

[0066] 2) Curing reaction

[0067] 1 kg of phthalic anhydride curing agent was added to the prepolymer and reacted at 150° C. for 4 h to obtain an epoxy resin-siloxane hybrid polymer.

[0068] Preparation Example II-2

[0069] The difference from Preparation Example II-1 is that the epoxy resin is replaced by the perfluoropolyether-modified epoxy resin obtained in Preparation Example I.

[0070] Preparation Example III-1

[0071] A modified aggregate, the preparation method of which is as follows:

[0072] The epoxy resin-siloxane hybrid polymer obtained in Preparation Example II-1 was sprayed onto the aggregate using a spraying device, and then dried at 70° C. to cover the surface of the aggregate with a layer of epoxy resin-siloxane hybrid polymer, thereby obtaining a modified aggregate.

[0073] Preparation Example III-2

[0074] Different from Preparation Example III-1, the epoxy resin-siloxane hybrid polymer in Preparation Example III-2 comes from Preparation Example II-2.

[0075] Preparation Example III-3

[0076] Different from Preparation Example III-1, in Preparation Example III-3, polydimethylsiloxane is used to replace the epoxy resin-siloxane hybrid polymer.

[0077] Example

[0078] Examples 1-3

[0079] A method for preparing a two-component waterproof real stone paint comprises the following steps:

[0080] S1. The raw material ratio according to Table 1 is pure acrylic emulsion, pigment, wetting dispersant, defoamer, thickener, pH regulator, bactericidal preservative, film-forming agent, aggregate and water, mixed and stirred to obtain component A;

[0081] S2. Stir the low-alkali cement to obtain component B;

[0082] S3. Mix component A and component B in a weight ratio of 10:1 and stir evenly to obtain a two-component waterproof real stone paint.

[0083] Table 1 Example 1-3A component raw material ratio table (kg)

[0084] Example 1 Example 2 Example 3 Pure acrylic emulsion 30 35 40 pigment 5 3 1 Wetting and dispersing agents 0.2 0.6 1.0 defoaming agent 1 0.6 0.2 thickener 0.2 1.1 2.0 pH adjusters 1.0 0.5 0.1 Bactericidal preservatives 0.1 0.2 0.2 Coal-forming agents 0.5 1.0 2.0 aggregate 60 50 40 water 2.0 8.0 13.5

[0085] Among them, the pigment is rutile titanium dioxide, the wetting and dispersing agent is polycarboxylic acid-alkyl ammonium salt, the defoaming agent is a polyether modified defoaming agent, the thickener is a polyurethane thickener, the pH adjuster is 2-amino-2-methyl-1-propanol, the bactericidal preservative is a broad-spectrum bactericidal preservative based on an aqueous liquid of isothiazolinone, the film-forming aid is dodecyl alcohol ester, and the aggregate includes natural colored sand of 40-80 mesh and natural colored sand with a particle size of 80-120 mesh in a weight ratio of 1:2.

[0086] Example 4

[0087] Different from Example 2, the aggregate in Example 4 includes natural colored sand with a particle size of 40-80 mesh and natural colored sand with a particle size of 80-120 mesh in a weight ratio of 1:3.

[0088] Example 5

[0089] Different from Example 2, the aggregate in Example 5 includes natural colored sand with a particle size of 40-80 mesh and natural colored sand with a particle size of 80-120 mesh in a weight ratio of 2:1.

[0090] Example 6

[0091] Different from Example 2, the aggregate in Example 6 is 2:1 40-80 mesh natural colored sand.

[0092] Example 7

[0093] Different from Example 2, the aggregate in Example 7 is natural colored sand with a particle size of 80-120 mesh.

[0094] Examples 8-10

[0095] Different from Example 2, in Examples 8-10, the aggregate was replaced by the modified aggregate from Preparation Examples III-1 to III-3 in equal amounts, respectively.

[0096] Comparative Example

[0097] Comparative Example 1

[0098] Different from Example 1, Comparative Example 1 does not include component B.

[0099] Performance testing

[0100] The properties of the real stone paint and the real stone paint film in the embodiments and comparative examples were tested, and the test results are shown in Table 2 and Table 3.

[0101] Table 2 Performance test results

[0102]

[0103]

[0104] Table 3 Performance test results

[0105] Water absorption / g Water resistance / h Alkali resistance / h Example 1 0.06 330 108 Example 2 0.05 345 108 Example 3 0.06 335 108 Example 4 0.05 350 108 Example 5 0.08 310 102 Example 6 1.02 290 102 Example 7 1.00 295 102 Example 8 0.02 400 120 Example 9 0.01 420 120 Example 10 0.03 390 120 Comparative Example 1 2.30 240 96

[0106] The water absorption refers to the water absorption in two hours, and the water resistance and alkali resistance refer to the fact that there is no abnormality in the coating within the testing time.

[0107] It can be seen from Examples 1-10 and Table 2 that the basic properties of the real stone paint obtained in this application all meet the requirements.

[0108] Combining Examples 1-10 with Comparative Example 1, and combining Table 3, it can be seen that the water absorption of the real stone paint obtained in Examples 1-10 is lower than that in Comparative Example 1, and the water resistance and alkali resistance of the real stone paint obtained in Examples 1-10 are better than those in Comparative Example 1, which shows that the comprehensive performance of the real stone paint prepared in this application is better.

[0109] Combining Example 1 with Comparative Example 1 and Table 3, it can be seen that the water absorption of the real stone paint obtained in Example 1 is lower than that of Comparative Example 1, and the water resistance and alkali resistance of the real stone paint obtained in Example 1 are better than those of Comparative Example 1, which shows that the addition of low-alkali cement can reduce the water absorption of the coating and improve the water resistance of the coating. This may be because cement itself has good waterproof properties. The addition of cement can prevent water from penetrating into the interior of the coating to a certain extent, enhance the waterproof properties of the coating, reduce the probability of bulging and falling off of the coating under rain erosion, and protect the wall from erosion by natural factors such as rain.

[0110] Combining Example 2 with Examples 4-7 and Table 3, it can be seen that the water absorption of the real stone paint obtained in Example 2 and Example 4 is lower than that in Example 5-7, and the water resistance and alkali resistance of the real stone paint obtained in Example 2 and Example 4 are better than those in Example 5-7, which shows that the gradation of the aggregate affects the waterproof performance of the coating, and the aggregate gradation in Example 2 and Example 4 is better. This may be because the aggregate gradation defined in this application makes the aggregate particles inside the coating evenly distributed, fills the pores, is not easy to absorb water and expand, and further improves the waterproof effect of the coating.

[0111] In conjunction with Example 2 and Example 8-10, and in conjunction with Table 3, it can be seen that the water absorption of the true stone paint obtained in Example 2 is higher than that of Example 8-10, and the water resistance and alkali resistance of the true stone paint obtained in Example 2 are all lower than those of Example 8-10. This illustrates that surface modification of aggregate can further improve the waterproof performance of coating, and wherein the modification method in Example 9 is more excellent. The chemical resistance of epoxy resin is combined with the low surface energy of siloxane by chemical bonds to form a hybrid material with excellent overall performance. Aggregate is modified with epoxy resin-siloxane hybrid polymer, and a waterproof layer can be formed on the surface of aggregate. This waterproof layer can effectively block the penetration of moisture, reduce the absorption of moisture, thereby improving the waterproof performance of coating. At the same time, the compatibility of aggregate and pure acrylic emulsion can be improved, further improving the overall performance of coating. Epoxy resin is fluorine-modified to form a fluorocarbon chain structure, which has extremely low surface energy, thereby significantly improving the hydrophobicity of the material.

[0112] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A two-component waterproof real stone paint, comprising component A and component B, characterized in that: The component A comprises the following raw materials in weight percentage: 30-40% pure acrylic emulsion, 1-5% pigment, 0.2-1% wetting and dispersing agent, 0.2-1% defoaming agent, 0.2-2% thickener, 0.1-1% pH regulator, 0.1-0.2% bactericidal preservative, 0.5-2% film-forming aid, 40-60% aggregate, and the balance is water; The B component is low-alkali cement; The weight ratio of component A to component B is (9.5-10.5):1; The aggregate is a modified aggregate that has been surface-modified with an epoxy resin-siloxane hybrid polymer; The preparation method of the epoxy resin-siloxane hybrid polymer is: 1) Prepolymerization Dissolve polydimethylsiloxane and epoxy resin in a solvent, then add a catalyst, and react at 80-120°C for 2-4 hours to obtain a prepolymer; 2) Curing reaction Adding a curing agent to the prepolymer and reacting at 120-180° C. for 2-6 hours to obtain an epoxy resin-siloxane hybrid polymer; The epoxy resin is a perfluoropolyether modified epoxy resin, and its preparation method is as follows: a) Activation of perfluoropolyether Perfluoropolyether is added to a solvent to form a perfluoropolyether solution, and then sodium hydroxide and methanol are added to react at 50-60° C. for 2-4 hours to obtain hydroxy-perfluoropolyether; b) Grafting reaction adding hydroxyl-perfluoropolyether to a solvent to form a hydroxyl-perfluoropolyether solution, then adding epoxy resin, and reacting at 80-100° C. for 2-4 hours to obtain a reaction product; c) Post-processing The reaction product is washed and dried to obtain a perfluoropolyether modified epoxy resin.

2. A two-component waterproof real stone paint according to claim 1, characterized in that: The aggregate is natural colored sand, including natural colored sand with a particle size of 40-80 meshes and natural colored sand with a particle size of 80-120 meshes.

3. A two-component waterproof real stone paint according to claim 2, characterized in that: The weight ratio of the natural colored sand with a particle size of 40-80 meshes to the natural colored sand with a particle size of 80-120 meshes is 1:(2-3).

4. A two-component waterproof real stone paint according to claim 1, characterized in that: The preparation method of the modified aggregate is as follows: spraying the epoxy resin-siloxane hybrid polymer on the aggregate to cover the surface of the aggregate with a layer of the epoxy resin-siloxane hybrid polymer.

5. The two-component waterproof real stone paint according to claim 1, characterized in that: The wetting and dispersing agent is one of polycarboxylic acid-alkyl ammonium salt or unsaturated fatty acid polyamine amide; The film-forming aid is one of ethylene glycol or dodecyl alcohol ester film-forming aids or a combination thereof; The defoaming agent is selected from any one of silicone, mineral oil or polyether modified defoaming agents; The thickener is one of a hydrophobically modified alkali swelling rheology regulator, a polyurethane thickener, a cellulose thickener, a bentonite thickener or a combination thereof.

6. A two-component waterproof real stone paint according to claim 5, characterized in that: The pH regulator is any one of 2-amino-2-methyl-1-propanol, ammonia water, and dimethylethanolamine.

7. A method for preparing a two-component waterproof real stone paint according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. The pure acrylic emulsion, pigment, wetting and dispersing agent, defoamer, thickener, pH adjuster, bactericidal preservative, film-forming agent, aggregate and water are mixed and stirred to obtain component A; S2. Stir the low-alkali cement to obtain component B; S3. Mix component A and component B according to the weight ratio and stir evenly to obtain a two-component waterproof real stone paint.

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