Composition for osmotic crystallization type waterproofing paint, osmotic crystallization type waterproofing paint, and preparation method and application thereof

Abstract

The application relates to the field of building waterproofing, and discloses a composition for a permeable crystalline waterproof coating, the permeable crystalline waterproof coating, and a preparation method and application thereof. The composition contains a main agent and an auxiliary agent; the main agent comprises cement, bioactive microspheres, a high-molecular water-absorbing polymer, a filler and latex powder; the cement is a combination of aluminate cement and portland cement with a content mass ratio of 1:11-55; the bioactive microspheres are prepared by the following method: mixing mixed bacterial liquid containing bacillus pasteurii and candida utilis with sodium alginate and calcium acetate to obtain the bioactive microspheres. The permeable crystalline waterproof coating provided by the application has excellent impermeability, bonding performance, repair performance and durability.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of building waterproofing, in particular to a composition for permeable crystalline waterproofing coating, a permeable crystalline waterproofing coating and a preparation method and application thereof. BACKGROUND

[0002] In the field of construction, waterproofing is related to structural safety and service life. Early rigid waterproofing relies on the waterproofing of concrete compactness, but as the scale of construction expands and waterproofing requirements improve, concrete defects are revealed. The internal pores and capillaries are numerous, and are easily cracked by temperature, settlement and stress, providing an open door for water penetration.

[0003] Traditional roll materials and coating waterproofing have been the main force. Roll materials rely on physical barriers, and coatings rely on the denseness of the coating for waterproofing. However, roll material construction has high requirements for the base, the joints are prone to leakage and aging deformation, and the waterproofing performance is greatly compromised; the coating is greatly affected by temperature and humidity, the coating is uneven, and the durability is poor. Frequent maintenance is costly and difficult to solve the waterproofing problem. At this time, permeable crystalline waterproofing coating stands out. Existing cement-based permeable crystalline waterproofing coating mainly uses calcium sulfate, calcium chloride, sodium silicate, aluminum silicate, citric acid and its metal salt, stearate and the like as the permeable crystalline masterbatch. The types of active masterbatch are relatively single, and its permeability, crystallization performance and waterproofing performance need to be further improved.

[0004] For example, CN110835257A discloses a preparation method of a cement-based permeable crystalline waterproofing coating, mainly including the following components by weight percentage: Portland cement 70%, quartz sand 20.5%, sodium silicate 2%, water-soluble fiber 2%, citric acid 1.5%, and calcium carbonate 4%. This kind of permeable crystalline waterproofing coating only uses sodium silicate as the active ingredient, which may be limited in the ability to stimulate the permeable crystallization reaction of cement-based materials. At the same time, the content of organic matter with adhesion function is very small, which may easily lead to coating falling off in actual use, affecting the waterproofing effect and material durability.

[0005] CN108751843A discloses a backwater pressure waterproofing coating for backwater leakage resistance, characterized in that, by weight fraction, it includes the following substances: Portland cement 400-500 parts; sand filler 350-480 parts; latex powder 20-50 parts; waterproofing agent 5-10 parts; coagulant 10-50 parts; active masterbatch 20-50 parts; thixotropic agent 2-10 parts; fiber 2-5 parts; cellulose ether 0-2 parts; defoaming agent 1-3 parts; pigment 1-10 parts. This scheme does not use a bioactive ingredient, making it difficult to achieve long-term automatic repair of fine cracks, and the anti-permeation pressure ratio and secondary anti-permeation pressure ratio may be suboptimal in high water pressure and complex environments. In terms of ingredient synergy, the ingredients do not exhibit synergistic effects, the overall performance is limited, and the effect of improving the durability of the concrete structure is not obvious. SUMMARY

[0006] The purpose of this invention is to solve the problems of impermeability, adhesion, repairability, and durability of existing penetrating crystalline waterproof coatings.

[0007] To achieve the above objectives, a first aspect of the present invention provides a composition for a penetrating crystalline waterproof coating, the composition comprising a main agent and an auxiliary agent; said main agent includes cement, bioactive microspheres, a superabsorbent polymer, filler, and latex powder;

[0008] Based on the total mass of the composition, the content of cement is 36-58 wt%, the content of bioactive microspheres is 0.5-5 wt%, the content of superabsorbent polymer is 0.01-0.05 wt%, the content of filler is 37-59 wt%, the content of latex powder is 2-6 wt%, and the content of additives is 0.45-1.2 wt%.

[0009] The cement is a combination of aluminate cement and silicate cement with a mass ratio of 1:11-55.

[0010] The bioactive microspheres are prepared by a method including the following steps: mixing a mixed bacterial solution containing Bacillus pasteurellii and Candida utilis with sodium alginate and calcium acetate to obtain the bioactive microspheres.

[0011] A second aspect of the present invention provides a method for preparing a penetrating crystalline waterproof coating, the method being carried out using the composition described in the first aspect, comprising: mixing and reacting a mixture containing the penetrating crystalline waterproof coating with a mixture of the components in the composition to obtain the penetrating crystalline waterproof coating.

[0012] A third aspect of the present invention provides a penetrating crystalline waterproof coating prepared by the method described in the second aspect.

[0013] The fourth aspect of the present invention provides the application of the penetrating crystalline waterproofing coating described in the third aspect in the field of building waterproofing.

[0014] This invention, through the compounding of bioactive microspheres of mixed bacterial strains with superabsorbent polymers, and the scientific combination of specific composite cement, fillers, and latex powder, as well as the precise control of the content of each component, can achieve complementary and enhanced functions. The resulting waterproof coating has at least the following beneficial effects compared to existing technologies:

[0015] 1. The waterproof coating provided by this invention can improve the repair effect through both physical filling and chemical reinforcement, and the impermeability is significantly improved;

[0016] 2. The microorganisms in the waterproof coating provided by this invention can remain active in the coating for more than 5 years, which is significantly better than the 1-2 year activity cycle in the prior art, and can ensure the long-term stable operation of the waterproof coating.

[0017] 3. The waterproof coating provided by this invention can achieve a "dormant-activation" intelligent response system; when dry, the superabsorbent polymer shrinks, causing microorganisms to go dormant and reducing nutrient consumption; when water seeps into cracks, the superabsorbent polymer quickly absorbs water and expands to form a moist microenvironment, directionally activating the microorganisms within the microspheres and precisely initiating repair. This mechanism can shorten the repair response time to within 24 hours, and unrepaired microspheres can be repeatedly activated, achieving a cycle of "repair upon damage, dormancy without damage";

[0018] 4. The waterproof coating provided by this invention has a stronger adhesion to the base material, which can effectively solve the problems of traditional waterproof materials being easy to fall off and having poor stability when applied to the back side of the water. Detailed Implementation

[0019] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0020] As previously described, a first aspect of the present invention provides a composition for a penetrating crystalline waterproof coating, the composition comprising a main agent and an auxiliary agent; the main agent includes cement, bioactive microspheres, a superabsorbent polymer, filler, and latex powder;

[0021] Based on the total mass of the composition, the content of cement is 36-58 wt%, the content of bioactive microspheres is 0.5-5 wt%, the content of superabsorbent polymer is 0.01-0.05 wt%, the content of filler is 37-59 wt%, the content of latex powder is 2-6 wt%, and the content of additives is 0.45-1.2 wt%.

[0022] The cement is aluminate cement and silicate cement with a content-to-mass ratio of 1:11-55;

[0023] The bioactive microspheres are prepared by a method including the following steps: mixing a mixed bacterial solution containing Bacillus pasteurellii and Candida utilis with sodium alginate and calcium acetate to obtain the bioactive microspheres.

[0024] Preferably, based on the total mass of the composition, the content of cement is 45-52 wt%, the content of bioactive microspheres is 1-3 wt%, the content of superabsorbent polymer is 0.01-0.02 wt%, the content of filler is 40-55 wt%, the content of latex powder is 3-5 wt%, and the content of additives is 0.45-1.2 wt%. The inventors have discovered that by precisely controlling the content of each component within this preferred range, the synergistic effect of each component can be better achieved, resulting in a waterproof coating with better overall performance in terms of impermeability, adhesion, and repair.

[0025] Preferably, the cement is a combination of aluminate cement and silicate cement with a mass ratio of 1:22-50. The inventors have discovered that, under this preferred embodiment, a certain strength can be achieved in a shorter time, and its hydration products can better fill the pores and capillary channels in the cement paste, making the structure denser and more effectively reducing the material's permeability and preventing moisture intrusion.

[0026] To help achieve higher bonding strength and cohesion, and to give the obtained waterproof coating better impermeability and deformation resistance, preferably, the latex powder is selected from at least one of VAE latex powder, styrene-acrylic latex powder and tert-vinyl acetate latex powder.

[0027] Preferably, the superabsorbent polymer is selected from at least one of cross-linked polyacrylamide, sodium polyacrylate, and chitosan derivatives.

[0028] More preferably, the superabsorbent polymer is a combination of cross-linked polyacrylamide and chitosan derivatives in a mass ratio of 1:2-5. The inventors have discovered that, under this preferred embodiment, the synergistic water absorption and retention properties of the two polymers can be fully utilized, resulting in a waterproof coating with superior adhesion strength and impermeability in humid environments, and also possessing a more durable self-healing ability.

[0029] More preferably, the cross-linked polyacrylamide has a number-average molecular weight of 100,000 to 500,000 and an average particle diameter of 45 to 150 μm.

[0030] More preferably, the chitosan derivative has a number average molecular weight of 10,000-50,000 and a water absorption ratio of 50-150 g / g. The inventors have found that if the water absorption ratio of the chitosan derivative is too low, it will not achieve the effect of quickly sealing micro-cracks and locking in moisture, while if the water absorption ratio is too high, it will cause excessive swelling of the material, leading to a loose structure and reduced adhesion. Therefore, within this preferred range, the balance between water absorption repair and structural stability required by the waterproof coating can be met.

[0031] Preferably, the filler is selected from at least one of sand, silica fume and heavy calcium carbonate.

[0032] More preferably, the filler is a combination of silica fume, heavy calcium carbonate, and sand in a mass ratio of 1:1.25-5:7.5-22.5. The inventors have discovered that, under this preferred embodiment, not only can a skeletal support be provided to enhance the structure and strength, but the internal chemical reaction process and microstructure of the material can also be controlled, thereby improving the durability and functionality of the waterproof coating.

[0033] To better adjust the size and distribution of pores inside the material and improve its density and impermeability, it is further preferred that the average diameter of the sand and gravel particles is 0.1-0.15 mm; the bulk density of the silica fume is less than 300 g / L; and the average diameter of the heavy calcium carbonate particles is 0.07-0.08 mm.

[0034] Preferably, in the method for preparing bioactive microspheres, the mixing step further includes:

[0035] SI-1: A mixed bacterial culture containing Bacillus pasteurellii and Candida utilis is first contacted with a sodium alginate aqueous solution of 3-5 wt% to obtain the first material;

[0036] SI-2, the first material is added dropwise to a calcium acetate aqueous solution with a concentration of 0.3-0.6 mol / L for a second contact to obtain the bioactive microspheres; the dropwise addition rate is 1-5 mL / min.

[0037] Preferably, the conditions for the first contact include: a temperature of 25-30°C, a stirring speed of 100-150 rpm, and a time of 0.5-2 h.

[0038] Preferably, the conditions for the second contact include: a temperature of 25-30°C, a stirring speed of 300-400 rpm, and a time of 2-3 hours.

[0039] In a preferred embodiment, the average diameter of the bioactive microspheres is 500-800 μm.

[0040] It should be noted that in the present invention, the method for preparing bioactive microspheres also includes conventional post-processing steps. For example, bioactive microspheres with a water content of no more than 30 wt% can be obtained by air drying and used to prepare waterproof coatings.

[0041] Preferably, in the preparation step of the bioactive microspheres, the total concentration of the mixed bacterial solution is 10. 7 -10 8 The CFU / mL ratio of *Bacillus pasteurellii* to *Candida utilis* is 1:0.4-0.6.

[0042] Preferably, in step SI-1, the volume ratio of the mixed bacterial solution to the sodium alginate aqueous solution with a concentration of 3-5 wt% is 1:3-8.

[0043] Preferably, in step SI-2, the volume ratio of the first material to the calcium acetate aqueous solution with a concentration of 0.3-0.6 mol / L is 1:5-15.

[0044] It should be noted that the concentration of the mixed bacterial solution can be adjusted by using a nutrient solution. The formulation of the nutrient solution is a conventional choice in the art. For example, the nutrient solution may contain 0.5-2 wt% sodium gluconate, 0.2-0.5 wt% potassium dihydrogen phosphate, and 0.3-0.8 wt% yeast powder. The present invention will not be described in detail here, and those skilled in the art should not understand it as a limitation of the present invention.

[0045] Preferably, the additives contain defoamers, water-reducing agents, water-retaining agents, and water-repellent agents.

[0046] More preferably, based on the total mass of the composition, the content of the defoamer is 0.1-0.3 wt%, the content of the water-reducing agent is 0.05-0.15 wt%, the content of the water-retaining agent is 0.1-0.2 wt%, and the content of the water-repellent agent is 0.2-0.4 wt%.

[0047] More preferably, the defoamer is selected from at least one of polyether defoamers and organosilicon defoamers; the water-reducing agent is selected from at least one of melamine water-reducing agents and polycarboxylate water-reducing agents; the water-retaining agent is selected from at least one of hydroxyethyl methylcellulose and hydroxypropyl methylcellulose; and the water-repellent agent is selected from at least one of organosilicon water-repellent agents and modified calcium silicate water-repellent agents.

[0048] As previously stated, a second aspect of the present invention provides a method for preparing a penetrating crystalline waterproof coating, the method being carried out using the composition described in the first aspect, comprising: mixing and reacting a mixture containing the penetrating crystalline waterproof coating with a mixture of the components in the composition to obtain the penetrating crystalline waterproof coating.

[0049] Preferably, the operation of carrying out the mixing reaction includes:

[0050] (1) The mixture containing the components of the penetrating crystalline waterproof coating composition is first mixed to obtain an intermediate material;

[0051] (2) The intermediate material and water are mixed in a second mixture at a mass ratio of 1:0.28-0.32 to obtain the penetrating crystalline waterproof coating.

[0052] More preferably, the conditions for the first mixing include: a temperature of 5-35°C, a time of 10-20 min, and a stirring speed of 150-300 rpm; the conditions for the second mixing include: a temperature of 5-35°C, a time of 5-10 min, and a stirring speed of 400-800 rpm.

[0053] As previously stated, a third aspect of the present invention provides a penetrating crystalline waterproof coating prepared by the method described in the second aspect above.

[0054] As previously stated, the fourth aspect of the present invention provides the application of the penetrating crystalline waterproofing coating described in the third aspect in the field of building waterproofing.

[0055] The present invention will be described in detail below through embodiments.

[0056] Unless otherwise specified, all reagents and raw materials involved in the following examples are commercially available products, and all reagents are analytical grade products.

[0057] raw material:

[0058] Pasteurella multocida: purchased from Shanghai Huzheng Biotechnology Co., Ltd.;

[0059] Candida utilis: purchased from Shanghai Huzheng Biotechnology Co., Ltd.;

[0060] Cross-linked polyacrylamide: number average molecular weight of 300,000, average particle diameter of 97 μm, model Bio-GelP, purchased from Tosoh Corporation, Japan;

[0061] Chitosan derivative: number average molecular weight of 30,000, water absorption ratio of 100 g / g, model number 5623, purchased from Shaanxi Xinyao Biotechnology Co., Ltd.

[0062] Sodium polyacrylate: Model CS00263, purchased from Hubei Changxinsheng Chemical Co., Ltd.

[0063] Sand and gravel: average particle diameter is 0.25mm, purchased from Anhui Yuancheng Silica Sand Technology Co., Ltd.;

[0064] Silica fume: bulk density 175 g / L, purchased from Quanzhou Weilinte Industrial Co., Ltd.

[0065] Heavy calcium carbonate: average particle diameter 0.074 mm, purchased from Changxing Huayuan Powder Materials Co., Ltd.;

[0066] Latex powder: 5515H, purchased from Wacker Chemie AG, Germany;

[0067] Defoamer: D130, purchased from Jiangsu Zhaojia Building Materials Technology Co., Ltd.;

[0068] Water-reducing agent: 325C, purchased from Sika, Switzerland;

[0069] Water-retaining agent: CMC1218, purchased from Shandong Heda Group Co., Ltd.;

[0070] Water repellent agent: WR650, purchased from Guangzhou Jiantubao Company.

[0071] Preparation Example 1

[0072] This preparation example illustrates that the bioactive microspheres provided by the present invention are prepared using the following method:

[0073] The total concentration of the mixed bacterial solution is 10. 7 CFU / mL; the CFU concentration ratio of Bacillus pasteurellii to the aforementioned Candida utilis was 1:0.4;

[0074] SI-1. A mixed bacterial solution containing Bacillus pasteurellii and Candida utilis is first contacted with a 3wt% sodium alginate aqueous solution to obtain a first material. The conditions for the first contact include: a temperature of 25°C, a stirring speed of 100 rpm, and a time of 2 hours. The volume ratio of the mixed bacterial solution to the 3wt% sodium alginate aqueous solution is 1:8.

[0075] SI-2: The first material is added dropwise to a 0.3 mol / L calcium acetate aqueous solution for a second contact, and then air-dried to obtain the bioactive microspheres Z1; the dropwise addition rate is 2 mL / min; the conditions for the second contact include: temperature of 25°C, stirring speed of 300 rpm, and time of 2 h; the volume ratio of the first material to the 0.3 mol / L calcium acetate aqueous solution is 1:15.

[0076] Preparation Example 2

[0077] This preparation example illustrates that the bioactive microspheres provided by the present invention are prepared using the following method:

[0078] The total concentration of the mixed bacterial solution is 10. 8 CFU / mL; the CFU concentration ratio of Bacillus pasteurellii to the aforementioned Candida utilis was 1:0.6;

[0079] SI-1. A mixed bacterial solution containing Bacillus pasteurellii and Candida utilis is first contacted with a 5 wt% sodium alginate aqueous solution to obtain a first material. The conditions for the first contact include: a temperature of 25°C, a stirring speed of 150 rpm, and a time of 1 hour. The volume ratio of the mixed bacterial solution to the 5 wt% sodium alginate aqueous solution is 1:3.

[0080] SI-2: The first material is added dropwise to a 0.6 mol / L calcium acetate aqueous solution for a second contact, and then air-dried to obtain the bioactive microspheres Z2; the dropwise addition rate is 3 mL / min; the conditions for the second contact include: temperature of 25℃, stirring speed of 400 rpm, and time of 3 h; the volume ratio of the first material to the 0.6 mol / L calcium acetate aqueous solution is 1:5.

[0081] Preparation Example 3

[0082] This preparation example uses a similar process to Preparation Example 1. The difference is that in this preparation example, the total concentration of the mixed bacterial solution is controlled to be the same as in Preparation Example 1; the CFU concentration ratio of Bacillus pasteurellii to the Candida utilis is 1:1.

[0083] The rest are the same as in Preparation Example 1.

[0084] Bioactive microspheres Z3 were prepared.

[0085] Preparation Example 4

[0086] This preparation example follows a similar procedure to Preparation Example 1, except that the total concentration of the mixed bacterial solution in this example is 10. 9 CFU / mL; the CFU concentration ratio of Bacillus pasteurellii to the aforementioned Candida utilis was 1:0.4;

[0087] The rest are the same as in Preparation Example 1.

[0088] Bioactive microspheres Z4 were prepared.

[0089] Preparation Example D1

[0090] This preparation example uses a similar process to Preparation Example 1. The difference is that in this preparation example, the total concentration of the bacterial solution is controlled to be the same as in Preparation Example 1; however, the bacterial solution contains only Bacillus pasteurellii and does not contain Candida utilis.

[0091] The rest are the same as in Preparation Example 1.

[0092] Bioactive microspheres DZ1 were prepared.

[0093] Preparation Example D2

[0094] This preparation example uses a similar process to Preparation Example 1. The difference is that in this preparation example, the total concentration of the bacterial solution is controlled to be the same as in Preparation Example 1; however, the bacterial solution contains only Candida utilis and does not contain Bacillus pasteurellii.

[0095] The rest are the same as in Preparation Example 1.

[0096] Bioactive microspheres DZ2 were prepared.

[0097] Preparation Example D3

[0098] (1) Preparation of bioactive microspheres of Bacillus pasteurellii

[0099] The total concentration of Pasteurella multocida was 10. 7 CFU / mL;

[0100] SI-1: The Bacillus pasteurellium culture is first contacted with a 3wt% sodium alginate aqueous solution to obtain the first material;

[0101] SI-2: The first material is added dropwise to a 0.3 mol / L calcium acetate aqueous solution for a second contact, and then air-dried to obtain Bacillus pasteurellii bioactive microspheres;

[0102] (2) Preparation of bioactive microspheres of Candida utilis

[0103] The concentration of Candida utilis was 10. 7 CFU / mL;

[0104] SI-1: The Candida utilis culture solution is first contacted with a 3wt% sodium alginate aqueous solution to obtain the first material;

[0105] SI-2: The first material is added dropwise to a 0.3 mol / L calcium acetate aqueous solution for a second contact, and then air-dried to obtain Candida utilis bioactive microspheres;

[0106] (3) The above-mentioned Bacillus pasteurellium bioactive microspheres and Candida utilis bioactive microspheres were mixed at a CFU concentration ratio of 1:0.4 to obtain mixed bioactive microspheres DZ3.

[0107] Example 1

[0108] (1) The mixture of each component in the composition containing penetrating crystalline waterproof coating is first mixed to obtain intermediate material; the conditions for the first mixing include: temperature of 25°C, time of 10 min, and stirring speed of 150 rpm.

[0109] (2) The intermediate material and water are mixed in a second mixture at a mass ratio of 1:0.28 to obtain the penetrating crystalline waterproof coating S1; the conditions for the second mixing include: temperature of 25°C, time of 10 min, and stirring speed of 500 rpm.

[0110] In this embodiment, the formulation of the composition for the penetrating crystalline waterproof coating is as follows:

[0111] Based on the total amount of the composition, the amount of cement is 47 wt%, the amount of bioactive microspheres is 2 wt%, the amount of superabsorbent polymer is 0.01 wt%, the amount of filler is 46.27 wt%, the amount of latex powder is 4 wt%, the amount of defoamer is 0.2 wt%, the amount of water-reducing agent is 0.12 wt%, the amount of water-retaining agent is 0.1 wt%, and the amount of water-repellent agent is 0.3 wt%.

[0112] The cement is a combination of aluminate cement and silicate cement in a mass ratio of 1:22.5;

[0113] The superabsorbent polymer is a combination of cross-linked polyacrylamide and chitosan derivative in a mass ratio of 1:2.

[0114] The filler is a combination of silica fume, heavy calcium carbonate, and sand in a mass ratio of 1:2.3:12.09;

[0115] The bioactive microspheres are the bioactive microspheres Z1 obtained in Preparation Example 1.

[0116] Example 2

[0117] (1) The mixture of each component in the composition containing penetrating crystalline waterproof coating is first mixed to obtain intermediate material; the conditions for the first mixing include: temperature of 25°C, time of 10 min, and stirring speed of 150 rpm.

[0118] (2) The intermediate material and water are mixed in a second mixing ratio of 1:0.32 to obtain the penetrating crystalline waterproof coating S2; the conditions for the second mixing include: temperature of 25°C, time of 10 min, and stirring speed of 500 rpm.

[0119] In this embodiment, the formulation of the composition for the penetrating crystalline waterproof coating is as follows:

[0120] Based on the total amount of the composition, the following amounts are used: cement (51 wt%), bioactive microspheres (2.5 wt%), superabsorbent polymer (0.015 wt%), filler (42.735 wt%), latex powder (3 wt%), defoamer (0.2 wt%), water-reducing agent (0.15 wt%), water-retaining agent (0.1 wt%), and water-repellent agent (0.3 wt%).

[0121] The cement is a combination of aluminate cement and silicate cement in a mass ratio of 1:50.

[0122] The superabsorbent polymer is a combination of cross-linked polyacrylamide and chitosan derivative in a mass ratio of 1:5.

[0123] The filler is a combination of silica fume, heavy calcium carbonate, and sand in a mass ratio of 1:1.25:8.43;

[0124] The bioactive microspheres are the bioactive microspheres Z2 obtained in Preparation Example 2.

[0125] Example 3

[0126] This embodiment follows a similar process to Example 1, except that the formulation of the composition for the penetrating crystalline waterproof coating is as follows:

[0127] Based on the total amount of the composition, the amount of cement is 47 wt%, the amount of bioactive microspheres is 5 wt%, the amount of superabsorbent polymer is 0.01 wt%, the amount of filler is 43.27 wt%, the amount of latex powder is 4 wt%, the amount of defoamer is 0.2 wt%, the amount of water-reducing agent is 0.12 wt%, the amount of water-retaining agent is 0.1 wt%, and the amount of water-repellent agent is 0.3 wt%.

[0128] Everything else is the same as in Example 1.

[0129] A penetrating crystalline waterproof coating S3 was prepared.

[0130] Example 4

[0131] This embodiment follows a similar process to Embodiment 1. The difference is that in this embodiment, the total amount of cement used is the same as in Embodiment 1, but the cement used is a combination of aluminate cement and silicate cement with a mass ratio of 1:11.

[0132] Everything else is the same as in Example 1.

[0133] A penetrating crystalline waterproof coating S4 was prepared.

[0134] Example 5

[0135] This embodiment follows a similar process to Example 1. The difference is that in this embodiment, the total amount of superabsorbent polymer is controlled to be the same as in Example 1, but the superabsorbent polymer is a combination of cross-linked polyacrylamide and sodium polyacrylate with a mass ratio of 1:2.

[0136] Everything else is the same as in Example 1.

[0137] A penetrating crystalline waterproof coating S5 was prepared.

[0138] Example 6

[0139] This embodiment follows a similar process to Embodiment 1. The difference is that in this embodiment, the total amount of filler is controlled in the same way as in Embodiment 1, but the filler is a combination of silica fume, heavy calcium carbonate and sand in a mass ratio of 1:1:1.

[0140] Everything else is the same as in Example 1.

[0141] A penetrating crystalline waterproof coating S6 was prepared.

[0142] Example 7

[0143] This embodiment follows a similar process to Example 1. The difference is that in this embodiment, the total amount of superabsorbent polymer is controlled to be the same as in Example 1, but the superabsorbent polymer is cross-linked polyacrylamide.

[0144] Everything else is the same as in Example 1.

[0145] A penetrating crystalline waterproof coating S7 was prepared.

[0146] Example 8

[0147] This embodiment follows a similar process to Example 1. The difference is that in this embodiment, bioactive microspheres Z3 obtained in Preparation Example 3 are used to replace Z1 in Example 1 with an equal mass.

[0148] Everything else is the same as in Example 1.

[0149] A penetrating crystalline waterproof coating S8 was prepared.

[0150] Example 9

[0151] This embodiment follows a similar process to Example 1. The difference is that in this embodiment, bioactive microspheres Z4 obtained in Preparation Example 4 are used to replace Z1 in Example 1 with an equal mass.

[0152] Everything else is the same as in Example 1.

[0153] A penetrating crystalline waterproof coating S9 was prepared.

[0154] Comparative Example 1

[0155] Comparative Example 1 was carried out using a similar process to Example 1. The difference is that in this comparative example, bioactive microspheres DZ1 obtained in Preparation Example D1 were used to replace Z1 in Example 1 with an equal mass.

[0156] Everything else is the same as in Example 1.

[0157] A penetrating crystalline waterproof coating DS1 was prepared.

[0158] Comparative Example 2

[0159] Comparative Example 2 was carried out using a similar process to Example 1. The difference is that in this comparative example, bioactive microspheres DZ2 obtained from Preparation Example D2 were used to replace Z1 in Example 1 with an equal mass.

[0160] Everything else is the same as in Example 1.

[0161] A penetrating crystalline waterproof coating DS2 was prepared.

[0162] Comparative Example 3

[0163] Comparative Example 3 was carried out using a similar process to Example 1. The difference is that in this comparative example, bioactive microspheres DZ3 obtained from Preparation Example D3 were used to replace Z1 in Example 1 with an equal mass.

[0164] Everything else is the same as in Example 1.

[0165] A penetrating crystalline waterproof coating DS3 was prepared.

[0166] Comparative Example 4

[0167] Comparative Example 4 was conducted using a similar procedure to Example 1, except that no superabsorbent polymer was used in this comparative example, and the formulation of the penetrating crystalline waterproof coating composition is as follows:

[0168] Based on the total amount of the composition, the amount of cement is 47 wt%, the amount of bioactive microspheres is 2 wt%, the amount of filler is 46.28 wt%, the amount of latex powder is 4 wt%, the amount of defoamer is 0.2 wt%, the amount of water-reducing agent is 0.12 wt%, the amount of water-retaining agent is 0.1 wt%, and the amount of water-repellent agent is 0.3 wt%.

[0169] Everything else is the same as in Example 1.

[0170] A penetrating crystalline waterproof coating DS4 was prepared.

[0171] Comparative Example 5

[0172] Comparative Example 5 was conducted using a similar procedure to Example 1, except that bioactive microspheres were not used in this comparative example, and the formulation of the composition for the penetrating crystalline waterproof coating was as follows:

[0173] Based on the total amount of the composition, the amount of cement is 47 wt%, the amount of the superabsorbent polymer is 0.01 wt%, the amount of filler is 48.27 wt%, the amount of latex powder is 4 wt%, the amount of defoamer is 0.2 wt%, the amount of water-reducing agent is 0.12 wt%, the amount of water-retaining agent is 0.1 wt%, and the amount of water-repellent agent is 0.3 wt%.

[0174] Everything else is the same as in Example 1.

[0175] A penetrating crystalline waterproof coating DS5 was prepared.

[0176] Comparative Example 6

[0177] This comparative example 6 was carried out using a similar process to Example 1, except that the cement used in this comparative example was silicate cement.

[0178] Everything else is the same as in Example 1.

[0179] A penetrating crystalline waterproof coating DS6 was prepared.

[0180] Comparative Example 7

[0181] This comparative example 7 was carried out using a similar process to Example 1, except that the cement used in this comparative example was aluminate cement.

[0182] Everything else is the same as in Example 1.

[0183] A penetrating crystalline waterproof coating DS7 was prepared.

[0184] Test case

[0185] The performance of the coatings obtained in the above examples was tested, and the results are shown in Table 1.

[0186] The test standard for bonding strength is GB 18445-2012;

[0187] The test standard for flexural strength is JC / T 984-2011;

[0188] The test standard for compressive strength is JC / T 984-2011;

[0189] The test standard for the water-resistant pressure ratio of the mortar coating on the back side is GB 18445-2012;

[0190] The test standard for the water-resistant pressure ratio of mortar without coating on the back side is GB 18445-2012;

[0191] The test standard for the secondary seepage resistance ratio of backwater mortar is GB 18445-2012, which replaces concrete blocks with mortar blocks.

[0192] The test standard for freeze-thaw cycle mass loss rate is JGJ / T 70.

[0193] Table 1

[0194]

[0195] The results in Table 1 show that the performance of penetrating crystalline waterproof coatings is affected by multiple factors. From the perspective of component synergy, the combination of composite bioactive microspheres and superabsorbent polymers yields the best performance, far exceeding that of single-strain, simple mixtures, or solutions lacking any component. Specific proportions of each component (such as the cement, polymer, and filler ratio in Example 1) and the appropriate dosage and proportion of bioactive microspheres are crucial for optimizing performance.

[0196] In summary, the present invention significantly improves the mechanical properties of the coating, such as bonding strength, flexural strength, and compressive strength. It also performs excellently in terms of backwater resistance and secondary water resistance, effectively solving the problem of waterproof layer failure due to insufficient water resistance in actual use. At the same time, the product also has good self-healing ability and durability, with a low quality loss rate after freeze-thaw cycles, which effectively ensures the integrity and stability of the coating film during use, greatly extends the effective service life of the product and improves its performance.

[0197] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A composition for a penetrating crystalline waterproof coating, characterized in that, The composition contains a main agent and an auxiliary agent; the main agent includes cement, bioactive microspheres, superabsorbent polymer, filler, and latex powder; Based on the total mass of the composition, the content of cement is 36-58 wt%, the content of bioactive microspheres is 0.5-5 wt%, the content of superabsorbent polymer is 0.01-0.05 wt%, the content of filler is 37-59 wt%, the content of latex powder is 2-6 wt%, and the content of additives is 0.45-1.2 wt%. The cement is a combination of aluminate cement and silicate cement with a mass ratio of 1:11-55. The bioactive microspheres are prepared by a method including the following steps: mixing a mixed bacterial solution containing Bacillus pasteurellii and Candida utilis with sodium alginate and calcium acetate to obtain the bioactive microspheres.

2. The composition according to claim 1, characterized in that, Based on the total mass of the composition, the content of cement is 45-52 wt%, the content of bioactive microspheres is 1-3 wt%, the content of superabsorbent polymer is 0.01-0.02 wt%, the content of filler is 40-46.27 wt%, the content of latex powder is 3-5 wt%, and the content of additives is 0.45-1.2 wt%.

3. The composition according to claim 1 or 2, characterized in that, The cement is a combination of aluminate cement and silicate cement with a content-to-mass ratio of 1:22-50; And / or, the superabsorbent polymer is selected from at least one of cross-linked polyacrylamide, sodium polyacrylate, and chitosan derivatives.

4. The composition according to claim 1 or 2, characterized in that, The superabsorbent polymer is a combination of cross-linked polyacrylamide and chitosan derivatives in a mass ratio of 1:2-5.

5. The composition according to claim 4, characterized in that, The cross-linked polyacrylamide has a number-average molecular weight of 100,000 to 500,000 and an average particle diameter of 45 to 150 μm. And / or, the number average molecular weight of the chitosan derivative is 10,000-50,000, and the water absorption ratio is 50-150 g / g.

6. The composition according to claim 1 or 2, characterized in that, The filler is selected from at least one of sand, silica fume and heavy calcium carbonate.

7. The composition according to claim 1 or 2, characterized in that, The filler is a combination of silica fume, heavy calcium carbonate and sand in a mass ratio of 1:1.25-5:7.5-22.

5.

8. The composition according to claim 6, characterized in that, The average diameter of the sand and gravel particles is 0.1-0.4 mm; the bulk density of the silica fume is less than 300 g / L; and the average diameter of the heavy calcium carbonate particles is 0.07-0.08 mm.

9. The composition according to claim 1 or 2, characterized in that, In the preparation step of the bioactive microspheres, the total concentration of the mixed bacterial solution is 10. 7 -10 8 The CFU / mL ratio of *Bacillus pasteurellii* to *Candida utilis* is 1:0.4-0.

6.

10. The composition according to claim 1 or 2, characterized in that, The additives contain defoamers, water-reducing agents, water-retaining agents, and water-repellent agents.

11. The composition according to claim 10, characterized in that, Based on the total mass of the composition, the content of the defoamer is 0.1-0.3 wt%, the content of the water-reducing agent is 0.05-0.15 wt%, the content of the water-retaining agent is 0.1-0.2 wt%, and the content of the water-repellent agent is 0.2-0.4 wt%.

12. A method for preparing a penetrating crystalline waterproof coating, characterized in that, The method is carried out using the composition according to any one of claims 1-11, comprising: mixing and reacting a mixture of the components in the composition containing the penetrating crystalline waterproof coating to obtain the penetrating crystalline waterproof coating.

13. A penetrating crystalline waterproof coating prepared by the method of claim 12.

14. The application of the penetrating crystalline waterproof coating according to claim 13 in the field of building waterproofing.

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