Building waterproof coating and preparation method thereof

Abstract

The invention provides a building waterproof coating and a preparation method thereof. The building waterproof coating is prepared from the following raw materials in parts by weight: 25 to 32 parts of modified acrylic emulsion, 15 to 19 parts of modified titanium dioxide, 12 to 15 parts of silicone acrylic emulsion, 7 to 10 parts of magnesium aluminum silicate, 6 to 8 parts of polyamide wax, 6 to 9 parts of polyglutamic acid, 8 to 12 parts of stearyl polydimethylsiloxane, 7 to 10 parts of oleoyl diethanolamine, 5 to 8 parts of sodium methyl silicate, 6 to 8 parts of ammonium polyphosphate and 3 to 5 parts of tributyl phosphate. Through reasonable raw material ratio of the modified acrylic emulsion, the modified titanium dioxide, the silicone acrylic emulsion, the magnesium aluminum silicate, the polyamide wax, the polyglutamic acid, the stearyl polydimethylsiloxane, the oleoyl diethanolamine, the methyl sodium silicate and the like, a synergistic effect can be achieved, and a uniform, compact, stable and excellent-adhesion waterproof network film is formed on the surface of a building; meanwhile, the strength of the coating is also improved, so that the surface of the coating is harder and wear-resistant, the protection effect of the waterproof coating is effectively prolonged, and the waterproof coating is not easy to peel and fall off.

Description

Technical Field

[0001] The present invention relates to the technical field of building waterproof coatings, and particularly relates to a building waterproof coating and a preparation method thereof. Background Art

[0002] With the development of economy and technology, modern architecture has developed rapidly. Modern buildings usually use concrete as the main material. Concrete is a porous medium material with good strength, but it also contains various micropores and has poor anti-seepage and waterproof properties. Water can slowly penetrate into the interior of the concrete, eventually causing cracks in the concrete, and even being corroded and destroyed, affecting the quality of the house and the living environment. Therefore, it is necessary to spray a waterproof coating so that the waterproof coating adheres to the concrete and forms a waterproof and anti-seepage protective film to protect the building. At present, the main building waterproof coatings include polymer cement-based waterproof coatings, polyurethane waterproof coatings, polymer emulsion waterproof coatings, etc. Although various building waterproof coatings have emerged, due to the unreasonable combination of raw materials, the performance of the waterproof coating is unstable, the adhesion ability of the coating to the building is poor, and subsequent peeling and cracking of the waterproof coating are likely to occur, and the waterproof and anti-seepage ability is poor. Summary of the Invention

[0003] In view of this, the present invention provides a building waterproof coating and a preparation method thereof.

[0004] The technical solution of the present invention is realized as follows:

[0005] A building waterproof coating, comprising the following raw materials in parts by weight: 25-32 parts of modified acrylic emulsion, 15-19 parts of modified titanium dioxide, 12-15 parts of silicon-acrylic emulsion, 7-10 parts of magnesium aluminum silicate, 6-8 parts of polyamide wax, 6-9 parts of polyglutamic acid, 8-12 parts of stearyl dimethicone, 7-10 parts of oleoyl diethanolamine, 5-8 parts of sodium methyl silicate, 6-8 parts of ammonium polyphosphate, and 3-5 parts of tributyl phosphate.

[0006] Further, the modified acrylic emulsion comprises the following raw materials in parts by weight: 24-29 parts of methyl methacrylate, 20-22 parts of ethyl acrylate, 13-15 parts of acrylic acid, 4-7 parts of N,N-methylenebisacrylamide, 5-8 parts of sodium dodecylbenzenesulfonate, 14-16 parts of nano calcium carbonate, 9-11 parts of nano alumina, 13-17 parts of absolute ethanol, 6-9 parts of silane coupling agent, and 12-16 parts of water.

[0007] Further, the preparation method of the modified acrylic emulsion is as follows:

[0008] (1) First, stir and mix methyl methacrylate, ethyl acrylate, acrylic acid, N,N-methylenebisacrylamide, sodium dodecylbenzenesulfonate, and water to obtain an acrylic emulsion;

[0009] (2) Add nano calcium carbonate and nano alumina into absolute ethanol, then add silane coupling agent and stir and mix them for the second time. Then add acrylic emulsion and stir and mix them for the third time to obtain the modified acrylic emulsion.

[0010] Furthermore, the rotation speed of the first stirring is 500 - 600 r / min, the temperature is 60 - 70 °C, and the time is 10 - 12 min.

[0011] Furthermore, the rotation speed of the second stirring is 300 - 400 r / min, the temperature is 50 - 70 °C, and the time is 15 - 18 min; the rotation speed of the third stirring is 800 - 1000 r / min, the temperature is 60 - 80 °C, and the time is 12 - 15 min.

[0012] Furthermore, the preparation method of the modified titanium dioxide is as follows: add titanium dioxide into silane coupling agent and carry out ultrasonic dispersion, then add water glass, N - hydroxymethyl acrylamide, and polyacrylate and carry out ball milling to obtain the modified titanium dioxide.

[0013] Furthermore, the mass ratio of titanium dioxide, water glass, silane coupling agent, N - hydroxymethyl acrylamide, and polyacrylate is 12 - 15:8 - 10:4 - 7:3 - 5:8 - 10.

[0014] Furthermore, the ultrasonic power of the ultrasonic dispersion is 300 - 450 W, the ultrasonic frequency is 20 - 25 kHz, and the ultrasonic time is 18 - 20 min.

[0015] Furthermore, the ball milling temperature is 50 - 70 °C, the ball milling rotation speed is 800 - 1200 r / min, and the ball milling time is 40 - 50 min.

[0016] Furthermore, the ball milling material is zirconia spheres with a diameter of 2 - 3 mm, and the filling rate of zirconia spheres is 60 - 70%.

[0017] Furthermore, the silane coupling agent is γ - methacryloxypropyltrimethoxysilane.

[0018] The preparation method of the building waterproof coating of the present invention includes the following steps: after uniformly mixing the modified acrylic emulsion, modified titanium dioxide, silicone - acrylic emulsion, stearyl dimethicone, and oleoyl diethanolamine under the condition of a rotation speed of 300 - 500 r / min, then add magnesium aluminum silicate, polyamide wax, polyglutamic acid, sodium methyl silicate, ammonium polyphosphate, and tributyl phosphate and mix them for 20 - 25 min under the condition of a rotation speed of 700 - 900 r / min to obtain the building waterproof coating.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] Through the reasonable proportioning of raw materials such as modified acrylic emulsion, modified titanium dioxide, silicone-acrylic emulsion, magnesium aluminum silicate, polyamide wax, polyglutamic acid, stearyl dimethicone, oleoyl diethanolamine, and sodium methyl silicate, the present invention can achieve a synergistic effect, forming a uniform, dense, stable, and excellent adhesion waterproof network film layer on the building surface, effectively preventing water penetration, while also improving the strength of the coating, making the coating surface harder and more wear-resistant, effectively extending the protection effect of the waterproof coating, not prone to peeling and falling off, and having a long service life.

[0021] The present invention prepares a modified acrylic emulsion from nano calcium carbonate, nano aluminum oxide, methyl methacrylate, ethyl acrylate, and acrylic acid, which can form a uniform and stable waterproof film. Using titanium dioxide, sodium silicate, polyacrylate and other raw materials to prepare modified titanium dioxide can improve the dispersibility of nano titanium dioxide in the coating, avoid agglomeration, and form a delicate and uniform protective film layer. Moreover, the combined action of nano titanium dioxide, nano calcium carbonate, and nano aluminum oxide effectively fills the pores in the coating, making it difficult for water molecules to penetrate into the coating interior, further enhancing the waterproof performance of the coating, while also enhancing the strength and wear resistance of the coating; Through the synergistic effect of magnesium aluminum silicate, polyamide wax, and polyglutamic acid, the adhesion between the coating and the substrate can be improved, avoiding cracking and peeling of the coating; Through the synergistic effect of stearyl dimethicone, oleoyl diethanolamine, and sodium methyl silicate, the stability of the waterproof network structure of the coating is enhanced, further ensuring the waterproofness of the coating layer. Specific Embodiments

[0022] To better understand the technical content of the present invention, specific embodiments are provided below to further illustrate the present invention.

[0023] Unless otherwise specified, the experimental methods used in the embodiments of the present invention are all conventional methods.

[0024] Unless otherwise specified, the materials, reagents, etc. used in the embodiments of the present invention can all be obtained from commercial channels.

[0025] Raw materials of the present invention Manufacturer Name Silicone-acrylic emulsion Guangzhou Guanglong Chemical Technology Co., Ltd. High water-resistant silicone-acrylic emulsion Oleoyl diethanolamine Hubei Guangao Biotechnology Co., Ltd. Oleoyl diethanolamine Polyacrylate Jinan Feiyue Chemical Co., Ltd. Polyacrylate

[0026] Example 1

[0027] The modified acrylic emulsion includes the following raw materials in parts by weight: 29 parts of methyl methacrylate, 21 parts of ethyl acrylate, 14 parts of acrylic acid, 6 parts of N,N - methylenebisacrylamide, 7 parts of sodium dodecylbenzenesulfonate, 14 parts of nano calcium carbonate, 11 parts of nano aluminum oxide, 13 parts of anhydrous ethanol, 7 parts of silane coupling agent, and 15 parts of water;

[0028] The preparation method of the modified acrylic emulsion is as follows:

[0029] (1) Methyl methacrylate, ethyl acrylate, acrylic acid, N,N-methylenebisacrylamide, sodium dodecylbenzenesulfonate, and water are stirred and mixed for 12 min at a rotation speed of 600 r / min and a temperature of 70 °C to obtain an acrylic emulsion;

[0030] (2) Nano calcium carbonate and nano alumina are added to anhydrous ethanol, and then a silane coupling agent is added. The mixture is stirred and mixed for 16 min at a rotation speed of 350 r / min and a temperature of 70 °C, and then the acrylic emulsion is added. The mixture is stirred and mixed for 14 min at a rotation speed of 1000 r / min and a temperature of 70 °C to obtain a modified acrylic emulsion;

[0031] The above-mentioned modified titanium dioxide is composed of titanium dioxide, sodium silicate, silane coupling agent, N-hydroxymethylacrylamide, and polyacrylate in a mass ratio of 15:10:7:4:8;

[0032] The preparation method of the modified titanium dioxide is as follows: Titanium dioxide is added to a silane coupling agent and ultrasonically dispersed for 18 min under the conditions of an ultrasonic power of 450 W and an ultrasonic frequency of 25 kHz, and then sodium silicate, N-hydroxymethylacrylamide, and polyacrylate are added for ball milling to obtain the modified titanium dioxide; The ball milling temperature is 60 °C, the ball milling rotation speed is 1100 r / min, and the ball milling time is 50 min;

[0033] The building waterproof coating of this example includes the following raw materials in parts by weight: 32 parts of modified acrylic emulsion, 16 parts of modified titanium dioxide, 14 parts of silicone-acrylic emulsion, 7 parts of magnesium aluminum silicate, 8 parts of polyamide wax, 9 parts of polyglutamic acid, 10 parts of stearyl dimethicone, 7 parts of oleoyl diethanolamine, 8 parts of sodium methyl silicate, 8 parts of ammonium polyphosphate, and 4 parts of tributyl phosphate;

[0034] The preparation method of this building waterproof coating includes the following steps: After mixing the modified acrylic emulsion, modified titanium dioxide, silicone-acrylic emulsion, stearyl dimethicone, and oleoyl diethanolamine evenly at a rotation speed of 500 r / min, then adding magnesium aluminum silicate, polyamide wax, polyglutamic acid, sodium methyl silicate, ammonium polyphosphate, and tributyl phosphate and mixing for 25 min at a rotation speed of 800 r / min to obtain the building waterproof coating.

[0035] Example 2

[0036] The modified acrylic emulsion includes the following raw materials in parts by weight: 26 parts of methyl methacrylate, 20 parts of ethyl acrylate, 13 parts of acrylic acid, 5 parts of N,N-methylenebisacrylamide, 6 parts of sodium dodecylbenzenesulfonate, 15 parts of nano calcium carbonate, 9 parts of nano alumina, 17 parts of anhydrous ethanol, 9 parts of silane coupling agent, and 12 parts of water;

[0037] The preparation method of the modified acrylic emulsion is as follows:

[0038] (1) Mix methyl methacrylate, ethyl acrylate, acrylic acid, N,N - methylenebisacrylamide, sodium dodecylbenzenesulfonate, and water at a rotation speed of 500 r / min and a temperature of 60 °C for the first stirring and mixing for 11 min to obtain an acrylic emulsion;

[0039] (2) Add nano - calcium carbonate and nano - alumina into absolute ethanol, then add a silane coupling agent and stir - mix for the second time at a rotation speed of 400 r / min and a temperature of 50 °C for 15 min, and then add the acrylic emulsion and stir - mix for the third time at a rotation speed of 800 r / min and a temperature of 60 °C for 15 min to obtain a modified acrylic emulsion;

[0040] The above - mentioned modified titanium dioxide is composed of titanium dioxide, sodium silicate, silane coupling agent, N - hydroxymethylacrylamide, and polyacrylate with a mass ratio of 13:8:5:3:9;

[0041] The preparation method of the modified titanium dioxide is as follows: Add titanium dioxide into a silane coupling agent and perform ultrasonic dispersion at an ultrasonic power of 300 W and an ultrasonic frequency of 20 kHz for 19 min, then add sodium silicate, N - hydroxymethylacrylamide, and polyacrylate and perform ball - milling to obtain the modified titanium dioxide; the ball - milling temperature is 70 °C, the ball - milling rotation speed is 800 r / min, and the ball - milling time is 45 min;

[0042] The building waterproof coating of this example includes the following raw materials in parts by weight: 28 parts of modified acrylic emulsion, 15 parts of modified titanium dioxide, 13 parts of silicone - acrylic emulsion, 10 parts of magnesium aluminum silicate, 6 parts of polyamide wax, 8 parts of polyglutamic acid, 9 parts of stearyl dimethicone, 10 parts of oleoyl diethanolamine, 5 parts of sodium methyl silicate, 7 parts of ammonium polyphosphate, and 3 parts of tributyl phosphate;

[0043] The preparation method of this building waterproof coating includes the following steps: After uniformly mixing the modified acrylic emulsion, modified titanium dioxide, silicone - acrylic emulsion, stearyl dimethicone, and oleoyl diethanolamine at a rotation speed of 400 r / min, then add magnesium aluminum silicate, polyamide wax, polyglutamic acid, sodium methyl silicate, ammonium polyphosphate, and tributyl phosphate and mix at a rotation speed of 700 r / min for 20 min to obtain the building waterproof coating.

[0044] Example 3

[0045] The modified acrylic emulsion includes the following raw materials in parts by weight: 24 parts of methyl methacrylate, 22 parts of ethyl acrylate, 15 parts of acrylic acid, 4 parts of N,N - methylenebisacrylamide, 8 parts of sodium dodecylbenzenesulfonate, 16 parts of nano - calcium carbonate, 10 parts of nano - alumina, 15 parts of absolute ethanol, 8 parts of silane coupling agent, and 14 parts of water;

[0046] The preparation method of the modified acrylic emulsion is as follows:

[0047] (1) Methyl methacrylate, ethyl acrylate, acrylic acid, N,N-methylenebisacrylamide, sodium dodecylbenzenesulfonate, and water are stirred and mixed for 10 min at a rotation speed of 550 r / min and a temperature of 65 °C to obtain an acrylic emulsion;

[0048] (2) Nano calcium carbonate and nano alumina are added to anhydrous ethanol, and then a silane coupling agent is added. The mixture is stirred and mixed for 18 min at a rotation speed of 300 r / min and a temperature of 60 °C, and then the acrylic emulsion is added. The mixture is stirred and mixed for 12 min at a rotation speed of 900 r / min and a temperature of 80 °C to obtain the modified acrylic emulsion;

[0049] The above-mentioned modified titanium dioxide is composed of titanium dioxide, sodium silicate, silane coupling agent, N-hydroxymethylacrylamide, and polyacrylate with a mass ratio of 14:9:6:5:10;

[0050] The preparation method of the modified titanium dioxide is as follows: Titanium dioxide is added to a silane coupling agent and ultrasonically dispersed for 20 min at an ultrasonic power of 400 W and an ultrasonic frequency of 25 kHz, and then sodium silicate, N-hydroxymethylacrylamide, and polyacrylate are added for ball milling to obtain the modified titanium dioxide; the ball milling temperature is 50 °C, the ball milling rotation speed is 1000 r / min, and the ball milling time is 40 min;

[0051] The building waterproof coating of this embodiment includes the following raw materials in parts by weight: 25 parts of modified acrylic emulsion, 19 parts of modified titanium dioxide, 12 parts of silicon-acrylic emulsion, 8 parts of magnesium aluminum silicate, 7 parts of polyamide wax, 6 parts of polyglutamic acid, 12 parts of stearyl dimethicone, 9 parts of oleoyl diethanolamine, 7 parts of sodium methyl silicate, 6 parts of ammonium polyphosphate, and 5 parts of tributyl phosphate;

[0052] The preparation method of this building waterproof coating includes the following steps: After uniformly mixing the modified acrylic emulsion, modified titanium dioxide, silicon-acrylic emulsion, stearyl dimethicone, and oleoyl diethanolamine at a rotation speed of 300 r / min, then adding magnesium aluminum silicate, polyamide wax, polyglutamic acid, sodium methyl silicate, ammonium polyphosphate, and tributyl phosphate and mixing for 23 min at a rotation speed of 900 r / min to obtain the building waterproof coating.

[0053] Comparative Example 1

[0054] The difference between this comparative example and Example 1 is that the raw material ratio of the building waterproof coating is changed, and the rest is the same as that of Example 1.

[0055] The building waterproof coating of this comparative example comprises the following raw materials in parts by weight: 15 parts of modified acrylic emulsion, 9 parts of modified titanium dioxide, 32 parts of silicone-acrylic emulsion, 20 parts of magnesium aluminum silicate, 11 parts of polyamide wax, 2 parts of polyglutamic acid, 4 parts of stearyl dimethicone, 17 parts of oleoyl diethanolamine, 1 part of sodium methyl silicate, 8 parts of ammonium polyphosphate, and 4 parts of tributyl phosphate.

[0056] Comparative Example 2

[0057] The difference between this comparative example and Example 1 lies in that the acrylic emulsion is not modified, and the rest is the same as in Example 1.

[0058] The acrylic emulsion comprises the following raw materials in parts by weight: 29 parts of methyl methacrylate, 21 parts of ethyl acrylate, 14 parts of acrylic acid, 7 parts of sodium dodecylbenzenesulfonate, and 15 parts of water;

[0059] The preparation method of the acrylic emulsion is as follows: methyl methacrylate, ethyl acrylate, acrylic acid, sodium dodecylbenzenesulfonate, and water are stirred and mixed once at a rotation speed of 600 r / min and a temperature of 70 °C for 12 min to obtain the acrylic emulsion.

[0060] The building waterproof coating of this comparative example comprises the following raw materials in parts by weight: 32 parts of acrylic emulsion, 16 parts of modified titanium dioxide, 14 parts of silicone-acrylic emulsion, 7 parts of magnesium aluminum silicate, 8 parts of polyamide wax, 9 parts of polyglutamic acid, 10 parts of stearyl dimethicone, 7 parts of oleoyl diethanolamine, 8 parts of sodium methyl silicate, 8 parts of ammonium polyphosphate, and 4 parts of tributyl phosphate;

[0061] The preparation method of the building waterproof coating comprises the following steps: after uniformly mixing acrylic emulsion, modified titanium dioxide, silicone-acrylic emulsion, stearyl dimethicone, and oleoyl diethanolamine at a rotation speed of 500 r / min, then adding magnesium aluminum silicate, polyamide wax, polyglutamic acid, sodium methyl silicate, ammonium polyphosphate, and tributyl phosphate and mixing at a rotation speed of 800 r / min for 25 min to obtain the building waterproof coating.

[0062] Comparative Example 3

[0063] The difference between this comparative example and Example 1 lies in that the raw materials of the building waterproof coating do not contain modified titanium dioxide, and the rest is the same as in Example 1.

[0064] The building waterproof coating of this comparative example comprises the following raw materials in parts by weight: 32 parts of modified acrylic emulsion, 22 parts of silicone-acrylic emulsion, 15 parts of magnesium aluminum silicate, 8 parts of polyamide wax, 9 parts of polyglutamic acid, 10 parts of stearyl dimethicone, 7 parts of oleoyl diethanolamine, 8 parts of sodium methyl silicate, 8 parts of ammonium polyphosphate, and 4 parts of tributyl phosphate;

[0065] The preparation method of the building waterproof coating includes the following steps: After uniformly mixing modified acrylic emulsion, silicone-acrylic emulsion, stearyl dimethicone, and oleoyl diethanolamine under the condition of a rotation speed of 500 r / min, then add magnesium aluminum silicate, polyamide wax, polyglutamic acid, sodium methyl silicate, ammonium polyphosphate, and tributyl phosphate and mix for 25 min under the condition of a rotation speed of 800 r / min to obtain the building waterproof coating.

[0066] Comparative Example 4

[0067] The difference between this comparative example and Example 1 is that: The raw materials of the building waterproof coating do not contain magnesium aluminum silicate, polyamide wax, and polyglutamic acid, and the rest are the same as those in Example 1.

[0068] The building waterproof coating of this comparative example includes the following raw materials in parts by weight: 32 parts of modified acrylic emulsion, 16 parts of modified titanium dioxide, 14 parts of silicone-acrylic emulsion, 17 parts of stearyl dimethicone, 15 parts of oleoyl diethanolamine, 17 parts of sodium methyl silicate, 8 parts of ammonium polyphosphate, and 4 parts of tributyl phosphate;

[0069] The preparation method of the building waterproof coating includes the following steps: After uniformly mixing modified acrylic emulsion, modified titanium dioxide, silicone-acrylic emulsion, stearyl dimethicone, and oleoyl diethanolamine under the condition of a rotation speed of 500 r / min, then add sodium methyl silicate, ammonium polyphosphate, and tributyl phosphate and mix for 25 min under the condition of a rotation speed of 800 r / min to obtain the building waterproof coating.

[0070] Comparative Example 5

[0071] The difference between this comparative example and Example 1 is that: The raw materials of the building waterproof coating do not contain stearyl dimethicone, oleoyl diethanolamine, and sodium methyl silicate, and the rest are the same as those in Example 1.

[0072] The building waterproof coating of this comparative example includes the following raw materials in parts by weight: 32 parts of modified acrylic emulsion, 16 parts of modified titanium dioxide, 19 parts of silicone-acrylic emulsion, 12 parts of magnesium aluminum silicate, 15 parts of polyamide wax, 17 parts of polyglutamic acid, 8 parts of ammonium polyphosphate, and 4 parts of tributyl phosphate;

[0073] The preparation method of the building waterproof coating includes the following steps: After uniformly mixing modified acrylic emulsion, modified titanium dioxide, and silicone-acrylic emulsion under the condition of a rotation speed of 500 r / min, then add magnesium aluminum silicate, polyamide wax, polyglutamic acid, ammonium polyphosphate, and tributyl phosphate and mix for 25 min under the condition of a rotation speed of 800 r / min to obtain the building waterproof coating.

[0074] The building waterproof coatings prepared in the above Examples 1-3 and Comparative Examples 1-5 were tested in accordance with GB / T16777-2008 "Test Methods for Building Waterproof Coatings", GB / T 23988-2009 "Determination of Coating Abrasion Resistance - Falling Sand Method", and GB / T9755-2014 "Synthetic Resin Emulsion Exterior Wall Coatings". The results are as follows:

[0075] Table 1 Performance Test of Building Waterproof Coatings

[0076]

[0077] The above results show that through the reasonable raw material ratio of the modified acrylic emulsion, modified titanium dioxide, silicone-acrylic emulsion, magnesium aluminum silicate, polyamide wax, polyglutamic acid, stearyl dimethicone, oleoyl diethanolamine, sodium methyl silicate and other raw materials in Examples 1-3 of the present invention, a synergistic effect can be achieved, making the coating have good waterproof performance, mechanical properties and abrasion resistance. Compared with Example 1, Comparative Example 1 changed the raw material ratio of the building waterproof coating, resulting in a decrease in the performance of the coating. Compared with Example 1, in Comparative Example 2, the acrylic emulsion was not modified, so that the coating could not form a good waterproof coating, the impermeability performance decreased, and at the same time the bonding performance also decreased, and it was easy to crack and fall off; compared with Example 1, in Comparative Example 3, it did not contain modified titanium dioxide, and the coating could not form a stable, dense and uniform waterproof coating, and at the same time the adhesion performance of the coating to the substrate also decreased. Compared with Example 1, Comparative Example 4 did not contain magnesium aluminum silicate, polyamide wax, and polyglutamic acid, and Comparative Example 5 did not contain stearyl dimethicone, oleoyl diethanolamine, and sodium methyl silicate, all of which led to a decrease in the performance of the coating. In addition, the waterproof coating prepared by the present invention also has good fluidity and can form a delicate and uniform protective layer on the building surface.

[0078] The above are only the 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 principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A building waterproof coating, characterized in that: The invention comprises the following raw materials in parts by weight: 25-32 parts of modified acrylic emulsion, 15-19 parts of modified titanium dioxide, 12-15 parts of silicone acrylic emulsion, 7-10 parts of magnesium aluminum silicate, 6-8 parts of polyamide wax, 6-9 parts of polyglutamic acid, 8-12 parts of stearyl polydimethylsiloxane, 7-10 parts of oleoyl diethanolamine, 5-8 parts of sodium methyl silicate, 6-8 parts of ammonium polyphosphate and 3-5 parts of tributyl phosphate.

2. The building waterproof coating according to claim 1, characterized in that: The modified acrylic emulsion comprises the following raw materials in parts by weight: 24-29 parts of methyl methacrylate, 20-22 parts of ethyl acrylate, 13-15 parts of acrylic acid, 4-7 parts of N,N-methylenebisacrylamide, 5-8 parts of sodium dodecylbenzene sulfonate, 14-16 parts of nano calcium carbonate, 9-11 parts of nano aluminum oxide, 13-17 parts of anhydrous ethanol, 6-9 parts of silane coupling agent and 12-16 parts of water.

3. The building waterproof coating according to claim 2, characterized in that: The preparation method of the modified acrylic emulsion is: (1) Methyl methacrylate, ethyl acrylate, acrylic acid, N,N-methylenebisacrylamide, sodium dodecylbenzenesulfonate, and water are stirred and mixed to obtain an acrylic emulsion; (2) Add nano calcium carbonate and nano aluminum oxide to anhydrous ethanol, then add a silane coupling agent and stir and mix twice, then add acrylic emulsion and stir and mix three times to obtain a modified acrylic emulsion.

4. The building waterproof coating according to claim 3, characterized in that: The primary stirring speed is 500-600 r / min, the temperature is 60-70° C., and the time is 10-12 min.

5. The building waterproof coating according to claim 3, characterized in that: The secondary stirring speed is 300-400 r / min, the temperature is 50-70° C., and the time is 15-18 min; the tertiary stirring speed is 800-1000 r / min, the temperature is 60-80° C., and the time is 12-15 min.

6. The building waterproof coating according to claim 1, characterized in that: The preparation method of the modified titanium dioxide is as follows: adding titanium dioxide into a silane coupling agent for ultrasonic dispersion, and then adding water glass, N-hydroxymethyl acrylamide and polyacrylate for ball milling to obtain the modified titanium dioxide.

7. The building waterproof coating according to claim 6, characterized in that: The mass ratio of the titanium dioxide, water glass, silane coupling agent, N-hydroxymethyl acrylamide and polyacrylate is 12-15:8-10:4-7:3-5:8-10.

8. The building waterproof coating according to claim 6, characterized in that: The ultrasonic power of the ultrasonic dispersion is 300-450W, the ultrasonic frequency is 20-25kHz, and the ultrasonic time is 18-20min.

9. The building waterproof coating according to claim 6, characterized in that: The ball milling temperature is 50-70° C., the ball milling speed is 800-1200 r / min, and the ball milling time is 40-50 min.

10. The method for preparing the building waterproof coating according to any one of claims 1 to 9, characterized in that: The following steps are involved: The modified acrylic emulsion, modified titanium dioxide, silicone acrylic emulsion, stearyl polydimethylsiloxane and oleoyl diethanolamine are uniformly mixed at a rotation speed of 300 to 500 r / min, and then magnesium aluminum silicate, polyamide wax, polyglutamic acid, sodium methyl silicate, ammonium polyphosphate and tributyl phosphate are added and mixed at a rotation speed of 700 to 900 r / min for 20 to 25 minutes to obtain a building waterproof coating.

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