A permeable crystalline waterproof coating, its preparation method and application

Abstract

The present invention provides a PENETRON crystalline waterproof coating, its preparation method and application. The coating is composed of a cement base material, quartz sand, active chemical substances, polymer emulsion, crystallization promoter, polycarboxylate water reducer, nano penetrant and silicone defoamer. The crystallization promoter is composed of a polyelectrolyte emulsion, a surfactant and an alkali metal salt in a specific mass ratio, and the nano penetrant is a nano material with a particle size less than 100 nm. The preparation method of the coating includes dry material mixing, premix preparation, defoaming treatment and homogenization to ensure the uniformity and stability of the coating. By optimizing the components and processes, it is more conducive to the formation of an effective crystalline structure. The coating of the present invention has excellent impermeability and durability, is suitable for the construction of the waterproof layer of buildings, and effectively improves the waterproof performance and service life of buildings.

Description

Technical Field

[0001] The present invention relates to the field of preparation of waterproof coatings, and particularly to a permeable crystalline waterproof coating, its preparation method and application. Background Art

[0002] Building waterproofing is a key link to ensure the structural safety of buildings and extend their service life. Traditional waterproof materials, such as asphalt, rubber and certain synthetic materials, can meet the waterproof requirements to a certain extent, but they have some inherent defects, such as poor durability, insufficient anti-permeability performance, weak environmental adaptability, etc. With the rapid development of the construction industry and the improvement of environmental protection requirements, the market demand for high-performance and environmentally friendly waterproof materials is increasing day by day; existing waterproof coatings include permeable crystalline waterproof coatings, including products of brands. Although they have many advantages, such as automatic repair of micro-cracks, good physical and chemical properties, long-lasting waterproof effect and environmental friendliness, they also have some limitations and defects:

[0003] On the one hand, the penetration depth of permeable crystalline waterproof materials is affected by the water penetration depth. The richer the water content in the base layer, the deeper the penetration depth. However, for concrete with a higher density, it is difficult for active substances to penetrate deep. On the other hand, the active ingredients are unevenly dispersed in the coating, resulting in a limited penetration depth and difficulty in penetrating deep into the base layer to form an effective crystal structure, so that the pores and micro-cracks of the base layer cannot be fully filled, and the waterproof performance is greatly reduced. The crystallization effect in existing coatings is not good, and the crystallization process cannot be effectively regulated, resulting in a slow crystallization speed, uneven crystal particle size and disordered distribution. This not only affects the compactness and continuity of the coating, but also reduces its anti-permeability ability and durability, further weakening the overall waterproof effect. Summary of the Invention

[0004] In view of this, the present invention proposes a permeable crystalline waterproof coating, its preparation method and application to solve the above problems.

[0005] The technical solution of the present invention is realized as follows: A permeable crystalline waterproof coating: comprising the following raw materials in parts by weight: 30-50 parts of cement base material, 5-10 parts of quartz sand, 10-20 parts of active chemical substances, 5-15 parts of polymer emulsion, 12-22 parts of crystallization promoter, 1-5 parts of polycarboxylate water reducer, 5-10 parts of nano-penetrant, 0.5-2 parts of silicone defoamer; the crystallization promoter is a polyelectrolyte emulsion, a surfactant, an alkali metal salt with a mass ratio of (3.5-6.5):(1.2-2.5):(8.5-12.2); the nano-penetrant is nano-silica, nano-aluminum oxide, nano-zinc oxide or nano-calcium carbonate, with a particle size <100nm.

[0006] Further, the active chemical substance is any one or a combination of several of sodium silicate, sodium carbonate, sodium sulfate, sodium hexametaphosphate, and potassium silicate.

[0007] Further, the polymer emulsion is one or a combination of several of acrylic emulsion, styrene-acrylic emulsion, or ethylene-vinyl acetate emulsion.

[0008] Further, the polyelectrolyte emulsion is prepared by adding a polyelectrolyte to a polymerization emulsion and ultrasonically mixing. The ultrasonic power is 210 - 240 W, the ultrasonic frequency is 100 - 200 kHz, and the ultrasonic time is 40 - 60 min. The polyelectrolyte includes an anionic polyelectrolyte or / and a cationic polyelectrolyte, and the polymerization emulsion includes any one or several of polylactic acid, polycaprolactone, polyacrylic acid, polyvinyl alcohol, or polystyrene sulfonic acid.

[0009] Further, the anionic polyelectrolyte includes one or several of polyacrylic acid, polymethacrylic acid, polystyrene sulfonic acid, polyvinyl sulfonic acid, polyphosphate ester, polysilicate, and sodium polystyrene sulfonate, and the cationic polyelectrolyte includes one or several of polyethyleneimine, poly(dimethyldiallylammonium chloride), polyacrylamide, chitosan, and polylysine.

[0010] Further, the surfactant is sodium dodecyl sulfate, sodium dodecylbenzene sulfonate, cetyltrimethylammonium chloride, fatty alcohol polyoxyethylene ether, or coconut diethanolamide.

[0011] Further, the alkali metal salt is any one of sodium carbonate, sodium sulfate, sodium nitrate, potassium chloride, and potassium carbonate.

[0012] Further, a preparation method of a penetrating crystalline waterproof coating includes the following steps:

[0013] S1. Put the weighed cement base material and quartz sand into a blender for grinding treatment, stir at a rate of 500 - 800 rpm for 5 - 10 min to make them fully mixed evenly, then slowly add the active chemical substance and continue to stir for 5 - 8 min to obtain a dry material;

[0014] S2. Add the polymer emulsion, crystallization promoter, polycarboxylate superplasticizer, and nano penetrant to the dry material in sequence. Each time an ingredient is added, stir for 5 - 10 min to obtain a premixed material;

[0015] S3. Continue to add the organosilicon defoamer while stirring. Stir at a rate of 200 - 400 rpm for 5 - 8 min until a uniform slurry is formed;

[0016] S4. Grind the obtained slurry at 500 - 800 rpm for 15 - 25 min, and then put it into a homogenizer for homogenization 1 - 3 times to improve the fineness and dispersibility of the coating, thereby obtaining a permeable crystalline waterproof coating.

[0017] Furthermore, the homogenization pressure is 40 - 80 MPa, the homogenization temperature is 30 - 50 °C, and the homogenization time is 15 - 25 min.

[0018] Furthermore, an application of a permeable crystalline waterproof coating in a building waterproof layer.

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

[0020] 1. Excellent permeable crystallization performance: Through reasonably proportioned raw materials and a unique crystallization promoter, it can penetrate deep into the base layer to form a uniform and dense crystal structure, effectively filling micro - pores and cracks, and significantly improving the waterproof performance and durability.

[0021] 2. Good impermeability: The use of a nano - permeating agent further enhances the penetration depth and impermeability effect of the coating, enabling active chemical substances to penetrate deep into the base material and preventing water penetration for a long time, thus ensuring the structural safety of the building.

[0022] 3. Improved construction performance: The polycarboxylate water - reducing agent in the formula helps to improve the fluidity and dispersibility of the coating, making the construction more convenient and efficient, and ensuring the uniformity of the coating.

[0023] 4. Enhanced adhesion: The synergistic effect of each component enables a firm bond to be formed between the coating and the base layer, making it not easy to fall off and peel, and improving the stability of the coating.

[0024] 5. Optimized preparation process: Through specific stirring, grinding, and homogenization steps, the full mixing and dispersion of each component are ensured, and the quality stability of the product is improved.

[0025] 6. Wide applicability: It is applicable to the waterproof layers of various buildings and can meet the waterproof requirements of different building structures and environmental conditions. Specific embodiments

[0026] To better understand the technical content of the present invention, specific embodiments are provided below to further illustrate the present invention.

[0027] The experimental methods used in the embodiments of the present invention are all conventional methods unless otherwise specified.

[0028] The materials, reagents, etc. used in the embodiments of the present invention can be obtained from commercial channels unless otherwise specified.

[0029] Example 1

[0030] A permeable crystalline waterproof coating: It comprises the following raw materials in parts by weight: 30 parts of cement base material, 5 parts of quartz sand, 10 parts of active chemical substance, 5 parts of polymer emulsion, 12 parts of crystallization promoter, 1 part of polycarboxylate water reducer, 5 parts of nano penetrant, 0.5 part of silicone defoamer;

[0031] The active chemical substance is sodium silicate;

[0032] The polymer emulsion is acrylic emulsion;

[0033] The crystallization promoter is a polyelectrolyte emulsion, surfactant, and alkali metal salt with a mass ratio of 3.5:1.2:8.5;

[0034] The polyelectrolyte emulsion is prepared by adding a polyelectrolyte to a polymerization emulsion and ultrasonically mixing. The ultrasonic power is 210W, the ultrasonic frequency is 100kHz, and the ultrasonic time is 40min. The polyelectrolyte is polyacrylic acid, and the polymerization emulsion is polylactic acid;

[0035] The surfactant is sodium dodecyl sulfonate;

[0036] The alkali metal salt is sodium carbonate;

[0037] The nano penetrant is nano silica with a particle size < 100nm.

[0038] Example 2

[0039] A permeable crystalline waterproof coating: It comprises the following raw materials in parts by weight: 50 parts of cement base material, 10 parts of quartz sand, 20 parts of active chemical substance, 15 parts of polymer emulsion, 22 parts of crystallization promoter, 5 parts of polycarboxylate water reducer, 10 parts of nano penetrant, 2 parts of silicone defoamer;

[0040] The active chemical substance is sodium carbonate;

[0041] The polymer emulsion is styrene-acrylic emulsion;

[0042] The crystallization promoter is a polyelectrolyte emulsion, surfactant, and alkali metal salt with a mass ratio of 6.5:2.5:12.2;

[0043] The polyelectrolyte emulsion is prepared by adding a polyelectrolyte to a polymerization emulsion and ultrasonically mixing. The ultrasonic power is 240W, the ultrasonic frequency is 200kHz, and the ultrasonic time is 60min. The polyelectrolyte is polyethyleneimine, and the polymerization emulsion includes polycaprolactone;

[0044] The surfactant is sodium dodecyl benzene sulfonate;

[0045] The alkali metal salt is sodium sulfate;

[0046] The nano penetrant is nano-aluminum oxide with a particle size < 100 nm.

[0047] Example 3

[0048] A permeable crystalline waterproof coating: includes the following raw materials in parts by weight: 40 parts of cementitious material, 8 parts of quartz sand, 15 parts of active chemical substance, 10 parts of polymer emulsion, 17 parts of crystallization promoter, 3 parts of polycarboxylate water reducer, 8 parts of nano penetrant, and 1.2 parts of silicone defoamer;

[0049] The active chemical substance is sodium sulfate;

[0050] The polymer emulsion is ethylene-vinyl acetate emulsion;

[0051] The crystallization promoter is a polyelectrolyte emulsion, surfactant, and alkali metal salt with a mass ratio of 4.5:1.8:10.2;

[0052] The polyelectrolyte emulsion is prepared by adding a polyelectrolyte to a polymerization emulsion and ultrasonically mixing. The ultrasonic power is 225 W, the ultrasonic frequency is 150 kHz, and the ultrasonic time is 50 min. The polyelectrolyte is poly(dimethyldiallylammonium chloride), and the polymerization emulsion is polyacrylic acid;

[0053] The surfactant is cetyltrimethylammonium chloride;

[0054] The alkali metal salt is potassium chloride;

[0055] The nano penetrant is nano-zinc oxide with a particle size < 100 nm;

[0056] The above Examples 1-3 adopt the following preparation method:

[0057] S1. Put the weighed cementitious material and quartz sand into a blender for grinding, stir at a rate of 700 rpm for 8 min to make them fully mixed evenly, then slowly add the active chemical substance and continue to stir for 7 min to obtain dry materials;

[0058] S2. Add the polymer emulsion, crystallization promoter, polycarboxylate water reducer, and nano penetrant to the dry materials in sequence. Stir for 8 min each time after adding one component to obtain a premix;

[0059] S3. Continue to add the silicone defoamer while stirring. Stir at a rate of 300 rpm for 7 min until a uniform slurry is formed;

[0060] S4. Grind the obtained slurry at 600 rpm for 20 min and then put it into a homogenizer for homogenization twice. The homogenization pressure is 60 MPa, the homogenization temperature is 40 °C, and the homogenization time is 20 min to obtain the permeable crystalline waterproof coating.

[0061] Example 4

[0062] A permeable crystalline waterproof coating: It includes the following raw materials in parts by weight: 40 parts of cement base material, 8 parts of quartz sand, 15 parts of active chemical substance, 10 parts of polymer emulsion, 17 parts of crystallization promoter, 3 parts of polycarboxylate water reducer, 8 parts of nano penetrant, and 1.2 parts of silicone defoamer;

[0063] The active chemical substance is sodium sulfate;

[0064] The polymer emulsion is ethylene-vinyl acetate emulsion;

[0065] The crystallization promoter is a polyelectrolyte emulsion, surfactant, and alkali metal salt with a mass ratio of 4.5:1.8:10.2;

[0066] The polyelectrolyte emulsion is prepared by adding polyelectrolyte to the polymerization emulsion and ultrasonically mixing. The ultrasonic power is 225W, the ultrasonic frequency is 150kHz, and the ultrasonic time is 50min. The polyelectrolyte is poly(dimethyldiallylammonium chloride), and the polymerization emulsion is polyacrylic acid;

[0067] The surfactant is cetyltrimethylammonium chloride;

[0068] The alkali metal salt is potassium chloride;

[0069] The nano penetrant is nano zinc oxide with a particle size < 100nm;

[0070] The above Example 4 adopts the following preparation method:

[0071] S1. Put the weighed cement base material and quartz sand into a blender for grinding treatment, stir at a rate of 500rpm for 5min to make the two fully mixed evenly, then slowly add the active chemical substance and continue to stir for 5min to obtain dry materials;

[0072] S2. Add the polymer emulsion, crystallization promoter, polycarboxylate water reducer, and nano penetrant to the dry materials in sequence. Stir for 5min each time after adding one component to obtain a premixed material;

[0073] S3. Continue to add the silicone defoamer while stirring. Stir at a rate of 200pm for 5min until a uniform slurry is formed;

[0074] S4. Grind the obtained slurry at 500rpm for 15min and then put it into a homogenizer for homogenization once. The homogenization pressure is 40MPa, the homogenization temperature is 30°C, and the homogenization time is 15 - 25min to obtain the permeable crystalline waterproof coating.

[0075] Example 5

[0076] A permeable crystalline waterproof coating: It includes the following raw materials in parts by weight: 40 parts of cement base material, 8 parts of quartz sand, 15 parts of active chemical substance, 10 parts of polymer emulsion, 17 parts of crystallization promoter, 3 parts of polycarboxylate water reducer, 8 parts of nano penetrant, and 1.2 parts of silicone defoamer;

[0077] The active chemical substance is sodium sulfate;

[0078] The polymer emulsion is ethylene-vinyl acetate emulsion;

[0079] The crystallization promoter is a polyelectrolyte emulsion, surfactant, and alkali metal salt with a mass ratio of 4.5:1.8:10.2;

[0080] The polyelectrolyte emulsion is prepared by adding polyelectrolyte to the polymerization emulsion and mixing ultrasonically. The ultrasonic power is 225W, the ultrasonic frequency is 150kHz, and the ultrasonic time is 50min. The polyelectrolyte is poly(dimethyldiallylammonium chloride), and the polymerization emulsion is polyacrylic acid;

[0081] The surfactant is cetyltrimethylammonium chloride;

[0082] The alkali metal salt is potassium chloride;

[0083] The nano penetrant is nano zinc oxide with a particle size < 100nm;

[0084] The above Example 5 adopts the following preparation method:

[0085] S1. Put the weighed cement base material and quartz sand into a blender for grinding treatment, stir at a rate of 800rpm for 10min to make the two fully mixed and uniform, then slowly add the active chemical substance and continue to stir for 8min to obtain dry materials;

[0086] S2. Add the polymer emulsion, crystallization promoter, polycarboxylate water reducer, and nano penetrant to the dry materials in sequence. Each time an ingredient is added, stir for 10min to obtain a premix;

[0087] S3. Continue to add the silicone defoamer while stirring. Stir at a rate of 400rpm for 8min until a uniform slurry is formed;

[0088] S4. Grind the obtained slurry at 800rpm for 25min and then put it into a homogenizer for homogenization 3 times. The homogenization pressure is 80MPa, the homogenization temperature is 50°C, and the homogenization time is 25min to obtain the permeable crystalline waterproof coating.

[0089] Comparative Example 1

[0090] The difference between this comparative example and Example 3 lies in a permeable crystalline waterproof coating, which comprises the following raw materials in parts by weight: 10 parts of cement base material, 15 parts of quartz sand, 8 parts of active chemical substance, 22 parts of polymer emulsion, 10 parts of crystallization accelerator, 8 parts of polycarboxylate water reducer, 1 part of nano penetrant, and 9 parts of silicone defoamer.

[0091] Comparative Example 2

[0092] The difference between this comparative example and Example 3 lies in that the raw materials of the permeable crystalline waterproof coating do not contain a crystallization accelerator.

[0093] Comparative Example 3

[0094] The difference between this comparative example and Example 3 lies in that the crystallization accelerator of the permeable crystalline waterproof coating is an anionic polyelectrolyte, a surfactant, and an alkali metal salt with a mass ratio of 4.5:1.8:10.2.

[0095] Comparative Example 4

[0096] The difference between this comparative example and Example 3 lies in that the raw materials of the permeable crystalline waterproof coating do not contain a nano penetrant.

[0097] Test Example 1 - Performance Effect Test

[0098] The coatings of Examples 1 - 5 and Comparative Examples 1 - 4 were evenly coated on the concrete surface to be waterproofed to form a continuous waterproof layer with a coating thickness of 0.5 ± 0.3 mm. After curing, the crystallization effect of the permeable crystalline waterproof coating was evaluated, including the formation, distribution, depth of crystallization, as well as the anti - permeability performance and corrosion resistance performance.

[0099] 1. Test Method:

[0100] (1) Crystal Observation: The surface and cross - section of the coating were sliced, and then the morphology and distribution of the crystals were observed under a microscope to evaluate whether the crystals were uniform, dense, and whether they could effectively fill the micropores and cracks on the concrete surface;

[0101] (2) Crystallization Depth Measurement: The coating sample was cut vertically, and a measuring tool was used to measure the depth of crystal penetration, and the measured value was recorded;

[0102] (3) Anti - permeability Performance Test: The cured specimens coated with the waterproof coating were placed in an impermeability tester, and according to the set water pressure increasing program, the water pressure was gradually increased starting from 0.1 MPa, and the water pressure was increased by 0.1 MPa every 30 min to evaluate the waterproof performance of the coating under pressure;

[0103] (5) Salt spray test: Place the test panel coated with the coating in a salt spray test chamber. The test solution is a 5% sodium chloride solution with a pH of 7. The temperature in the salt spray chamber is set at 35 ± 2 °C. The salt spray deposition rate is controlled at 1 - 2 mL / (80 cm 2 ·h), and the relative humidity is maintained above 95%. Record the salt spray test time.

[0104] 2. Test results:

[0105] Table 1:

[0106]

[0107]

[0108] Table 2:

[0109]

[0110]

[0111] I. Analysis of crystallization effect

[0112] As can be seen from Table 1, the crystals in all examples are in the form of fine particles and are evenly distributed. This morphology is beneficial for forming a dense waterproof layer and improving the overall waterproof performance of the coating. In particular, in Examples 3 and 5, the crystals are neatly arranged and regularly distributed, showing excellent crystallization quality. The crystallization depth in the examples is generally relatively deep, with an average value above 1.7 mm, and the maximum value can reach 3.0 mm. This indicates that the coating can penetrate deep into the substrate and form a more stable waterproof barrier. In particular, in Examples 3 and 5, their average crystallization depth is relatively high, showing stronger penetration ability and a wider protection range.

[0113] II. Analysis of anti-seepage performance

[0114] In terms of the anti-seepage pressure and anti-seepage time in Table 2, Examples 1 - 5 can all maintain no water seepage within 24 hours, and the anti-seepage pressure is between 2.0 - 2.2 MPa. This indicates that the coating has a strong waterproof barrier ability and can effectively prevent water penetration.

[0115] III. Analysis of salt spray test results

[0116] Examples 1 - 5 performed excellently in the salt spray test, with the salt spray test time all above 1000 hours, indicating that they have good salt spray corrosion resistance. Due to the good crystallization effect and dense coating structure, they can effectively block the erosion of salt spray.

[0117] Comparing Example 3 with Comparative Example 1 shows that the raw materials of the waterproof coating can play a better synergistic role under scientific proportioning.

[0118] Comparing Example 3 with Comparative Examples 2 and 3, the present invention selects specific ratios and raw materials to formulate a crystallization promoter, which can promote the penetration and crystallization of active ingredients in the coating into the concrete substrate through different mechanisms, thereby enhancing the waterproof performance and durability of the coating. Among them, the polyelectrolyte emulsion can adjust the ionic environment of the coating system, provide more favorable conditions for crystallization, and accelerate the crystallization process. The surfactant can reduce the surface tension of the system, increase the contact area between the active substance and the substrate, and promote the rapid formation of crystallization. The alkali metal salt can provide necessary ions to accelerate chemical reactions, thereby increasing the crystallization rate. These crystallization promoters help to make the crystallization more evenly distributed in the coating and the substrate, reduce local defects, improve the overall waterproof performance and durability. Faster and more uniform crystallization can more effectively fill the pores and microcracks in the substrate, form a dense waterproof barrier, enhance the anti-seepage ability of the coating, and prevent the penetration of moisture.

[0119] Comparing Example 3 with Comparative Example 4, the nano-penetrant of the present invention can penetrate into the fine cracks and fissures of the concrete, enabling the waterproof coating to more comprehensively cover the concrete surface, reducing the unprotected areas, thereby increasing the overall penetration depth and uniformity of the coating. It can also better interact with the substrate to form a stronger bond, improving the adhesion and durability of the coating. The waterproof layer formed by the nano-penetrant has excellent anti-seepage performance and can effectively prevent the penetration of moisture and harmful substances.

[0120] In summary, the crystallization effect, anti-seepage performance, and salt spray corrosion resistance of the examples are all superior to those of the comparative examples. This shows that in the formulation and process of the permeable crystallization waterproof coating, the conditions and components adopted in the examples are more conducive to forming an effective crystallization structure, enabling the coating to form a stable waterproof barrier in practical applications, effectively preventing the penetration of moisture and corrosive media, and thus protecting the substrate from damage.

[0121] 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 principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A penetrating crystallization waterproof coating, characterized in that: The invention is composed of the following raw materials in parts by weight: 30-50 parts of cement base material, 5-10 parts of quartz sand, 10-20 parts of active chemical substances, 5-15 parts of polymer emulsion, 12-22 parts of crystallization accelerator, 1-5 parts of polycarboxylic acid water reducer, 5-10 parts of nano penetrant, and 0.5-2 parts of organosilicon defoamer; the active chemical substances are any one or a combination of sodium silicate, sodium carbonate, sodium sulfate, sodium hexametaphosphate, and potassium silicate; The crystallization accelerator is a polyelectrolyte emulsion, a surfactant, and an alkali metal salt in a mass ratio of (3.5-6.5):(1.2-2.5):(8.5-12.2); the polyelectrolyte emulsion is prepared by adding a polyelectrolyte to a polymer emulsion and ultrasonically mixing, the ultrasonic power is 210-240W, the ultrasonic frequency is 100-200kHz, and the ultrasonic time is 40-60min. The polyelectrolyte is a cationic polyelectrolyte, and the polymer emulsion includes any one or more of polylactic acid, polycaprolactone, polyacrylic acid, polyvinyl alcohol or polystyrene sulfonic acid; the cationic polyelectrolyte includes one or more of polyethyleneimine, polydimethyldiallylammonium chloride, polyacrylamide, chitosan, and polylysine; the surfactant is sodium dodecyl sulfonate, sodium dodecylbenzene sulfonate, hexadecyltrimethylammonium chloride, fatty alcohol polyoxyethylene ether or coconut acid diethanolamide; the alkali metal salt is any one of sodium carbonate, sodium sulfate, sodium nitrate, potassium chloride, and potassium carbonate; The nano penetrant is nano silicon dioxide, nano aluminum oxide, nano zinc oxide or nano calcium carbonate, and the particle size is less than 100 nm.

2. A penetrating crystallization waterproof coating according to claim 1, characterized in that: The polymer emulsion is one or more combinations of acrylic emulsion, styrene acrylic emulsion or ethylene-vinyl acetate emulsion.

3. The method for preparing a penetrating crystallization waterproof coating according to claim 1, characterized in that: The following steps are involved: S1. Put the weighed cement base material and quartz sand into a mixer for grinding, stir at a rate of 500-800 rpm for 5-10 min to fully mix the two, then slowly add the active chemical substance, continue stirring for 5-8 min to obtain a dry material; S2, adding polymer emulsion, crystallization accelerator, polycarboxylate water reducer and nano penetrant to the dry material in sequence, stirring for 5-10 minutes each time adding one ingredient to obtain a premix; S3, continue to add the organosilicon defoamer while stirring, stirring at a rate of 200-400 rpm for 5-8 minutes until a uniform slurry is formed; S4. Grind the obtained slurry at 500-800 rpm for 15-25 min, and then put it into a homogenizer for homogenization 1-3 times to obtain a penetrating crystalline waterproof coating.

4. The method for preparing a permeable crystallization waterproof coating according to claim 3, characterized in that: The homogenization pressure is 40-80 MPa, the homogenization temperature is 30-50° C., and the homogenization time is 15-25 min.

5. Application of a penetrating crystalline waterproof coating as described in any one of claims 1 to 2 in a building waterproof layer.

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