Osmotic crystallization waterproofing agent and method for preparing the same

Abstract

The application discloses a kind of penetrating crystallization waterproofing agent and preparation method thereof, it is related to concrete additive technical field.The penetrating crystallization waterproofing agent includes base material and additive, the base material includes sodium silicate, lithium silicate, copper silicate, ferrous sulfate, potassium red arsenate and water, the additive includes graphene slurry, sodium dodecyl sulfate, sodium toluene acid, anhydrous sodium citrate, sodium laureth sulfate, coconut oil, sodium chloride and calcium chloride.The penetrating crystallization waterproofing agent of the application has strong permeability, strong water pressure resistance, and is not easy to peel and fall off.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of concrete, in particular to a penetrating crystalline waterproofing agent and a preparation method thereof. BACKGROUND

[0002] Concrete is prone to water seepage, cracking and frost heaving, so a waterproofing agent needs to be added for prevention.

[0003] The penetrating crystalline waterproofing agent can deeply penetrate into the interior of concrete, chemically react with free alkali substances to form crystals, effectively block all capillary pore channels and cracks in the interior of concrete, and play a role in waterproofing, corrosion prevention, dust prevention and wear prevention, thereby protecting concrete and internal steel bars and prolonging service life.

[0004] However, the current powder-shaped penetrating crystalline waterproofing agent has the following disadvantages: insufficient crystallization strength, poor water pressure resistance, easy to be washed off by rain in rainy days, insufficient penetration in dry environments, and easy to powder and crack, resulting in peeling and peeling on the surface. SUMMARY

[0005] The present application is made in view of the above problems, and provides a penetrating crystalline waterproofing agent and a preparation method thereof.

[0006] The present application provides a penetrating crystalline waterproofing agent, which comprises a base material and an additive, wherein the base material comprises sodium silicate, lithium silicate, copper silicate, ferrous sulfate, potassium dichromate and water, and the additive comprises graphene slurry, sodium dodecyl sulfate, sodium toluene acid, anhydrous sodium citrate, sodium lauryl alcohol polyoxyethylene ether sulfate, coconut oil, sodium chloride and calcium chloride.

[0007] In some embodiments of the present application, the base material comprises, in parts by weight, 30-40 parts of sodium silicate, 20-30 parts of lithium silicate, 2-5 parts of copper silicate, 2-5 parts of ferrous sulfate, 2-5 parts of potassium dichromate and 20-40 parts of water.

[0008] In some embodiments of the present application, the additive comprises, in parts by weight, 0.5-1 parts of graphene slurry, 1-2 parts of sodium dodecyl sulfate, 10-20 parts of sodium toluene acid, 0.1-0.5 parts of anhydrous sodium citrate, 0.1-0.5 parts of sodium lauryl alcohol polyoxyethylene ether sulfate, 15-25 parts of coconut oil, 3-8 parts of sodium chloride and 0.5-1 parts of calcium chloride.

[0009] In some embodiments of the present application, the weight ratio of the base material to the additive is 1: (0.01-0.05).

[0010] In some embodiments of the present application, the solid content of the graphene slurry is 2wt %-5.0wt %, and the flake diameter of graphene is 1-5 μm.

[0011] A second aspect of the present invention provides a method for preparing a penetrating crystallizing waterproofing agent, comprising the following steps:

[0012] S1. Sodium silicate, lithium silicate, copper silicate, ferrous sulfate, and potassium chromium sulfate are added to water and stirred at a speed of 400-600 r / min for 10-20 min, then heated and cooled to room temperature to obtain a mixed solution A;

[0013] S2, mixing graphene slurry, sodium lauryl polyoxyethylene ether sulfate, sodium lauryl sulfate, coconut oil, and anhydrous sodium citrate, stirring at a speed of 600-800 r / min for 5-10 min, then adding sodium benzoate, sodium chloride, and calcium chloride, stirring at a speed of 200-300 r / min for 8-12 min to obtain a mixed solution B;

[0014] S3. Adding mixed solution B to the mixed solution A, mixing and shearing, and letting it stand for 0.5 to 1 hour to obtain a penetrating crystallization waterproofing agent.

[0015] In some embodiments of the present invention, in step S1, heating includes heating to 50-60° C. and then keeping the temperature for 1-2 hours.

[0016] In some embodiments of the present invention, the preparation method of the graphene slurry includes: modifying graphene using a silane coupling agent containing double bonds to obtain modified graphene; adding the modified graphene, fumaric acid, and 2-methylacrylamide into water, mixing and heating for reaction, then adding an initiator, a surfactant, and polyvinyl alcohol, heating for reaction, and adjusting the pH to obtain a mixed material; modifying the mixed material using mercaptopropyltriethoxysilane to obtain mercapto-containing graphene; adding the mercapto-containing graphene and 2,2-diallylbisphenol A into ethyl acetate, mixing, adding benzoin dimethyl ether and mixing, reacting under ultraviolet light, washing and drying after the reaction, and ball-milling with water to obtain a graphene slurry.

[0017] In some embodiments of the present invention, the double bond-containing silane coupling agent includes one of γ-(methacryloyloxy)propyltrimethoxysilane, γ-(ethylenediamino)propyltrimethoxysilane, and diethylenetriaminopropyltrimethoxysilane.

[0018] In some embodiments of the present invention, the preparation of the mercapto-containing graphene includes: adding mercaptopropyltriethoxysilane to ethyl acetate, adding ethyl orthosilicate and stirring to obtain a mercapto-containing mixed material; mixing the mixed material and the mercapto-containing mixed material evenly, adjusting the pH, stirring, standing to react, centrifuging to obtain a precipitate, washing and drying to obtain the mercapto-containing graphene.

[0019] The beneficial effects that can be achieved by the present invention are:

[0020] The present application provides a kind of penetrating crystallization waterproofing agent, the component such as sodium silicate, lithium silicate, copper silicate in base material reacts with water to form silicic acid gel, fill the capillary hole of concrete, the strong oxidizing property of potassium ferric alum and ferrous sulfate cooperate to help promote the setting speed, inhibit the corrosion process in concrete, improve the durability of concrete.The addition of graphene slurry and sodium chloride and calcium chloride are used together to adjust the ionic strength of waterproofing agent, affect its penetration and crystallization process in concrete not only improves the permeability of waterproofing agent, and the microstructure of graphene also helps to improve the durability and structural stability of concrete;Coconut oil is used to improve the adhesion and flexibility of waterproofing agent, thereby enhancing the bonding performance of concrete with other materials.

[0021] The waterproofing agent of the present application has strong permeability, strong water pressure resistance, can produce secondary crystallization at base defects after water, has the function of automatically repairing microcracks and other defects, is strong against base changes, is not easy to peel and fall off, and can improve the compactness and physical properties of concrete. DETAILED DESCRIPTION

[0022] The following description is provided so that those skilled in the art can sufficiently understand the present application and is not intended to limit the subject matter recited in the claims.

[0023] The "range" disclosed in the present application is limited in the form of lower limit and upper limit, a given range is limited by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundary of a particular range. The range defined in this way can include or not include the end value, and can be arbitrarily combined, i.e. any lower limit can be combined with any upper limit to form a range. For example, if the ranges of 60~120 and 80~110 are listed for a particular parameter, it is understood that the ranges of 60~110 and 80~120 are also anticipated. In addition, if the minimum range value 1 and 2 are listed, and if the maximum range value 3, 4 and 5 is listed, the following ranges can all be anticipated: 1~3, 1~4, 1~5, 2~3, 2~4 and 2~5. In the present application, unless otherwise specified, the numerical range "a~b" represents a shorthand representation of any real number combination between a and b, where a and b are both real numbers. For example, the numerical range "0~5" means that all real numbers between "0~5" have been listed herein, and "0~5" is only a shorthand representation of these numerical combinations. In addition, when a parameter is expressed as ≥2 integers, it is equivalent to disclose that the parameter is, for example, integer 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0024] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form new technical solutions.

[0025] If there is no special indication, all the technical features of the present application and optional technical features can be combined with each other to form new technical solutions.

[0026] If there is no special indication, all the steps of the present application can be performed in sequence or randomly, preferably in sequence. For example, the method comprises steps (a) and (b), which means that the method can comprise steps (a) and (b) in sequence, or steps (b) and (a) in sequence. For example, the method also comprises step (c), which means that step (c) can be added to the method in any order, for example, the method can comprise steps (a), (b) and (c), or steps (a), (c) and (b), or steps (c), (a) and (b), etc.

[0027] Concrete is prone to water seepage, cracking and frost heaving, so waterproofing agents need to be added to prevent it.

[0028] Penetrating crystalline waterproofing agent can penetrate deeply into the interior of concrete, chemically react with free alkali substances to form crystals, effectively block all capillary pore channels and cracks in the interior of concrete, and play the role of waterproofing, corrosion prevention, dust prevention and wear prevention, protecting concrete and internal steel bars and prolonging service life.

[0029] However, the current powder-shaped penetrating crystalline waterproofing agent has the following disadvantages: the crystalline strength is not enough, the water pressure resistance is poor, the coating is easily washed off by rain in rainy days; in dry environment, the penetration is not enough and is easy to powder and crack, resulting in peeling and peeling on the surface.

[0030] In view of this, the present application provides a penetrating crystalline waterproofing agent, which comprises a base and an additive, the base comprises sodium silicate, lithium silicate, copper silicate, ferrous sulfate, potassium red mordant and water, and the additive comprises graphene slurry, sodium dodecyl sulfate, sodium toluene acid, anhydrous sodium citrate, sodium lauryl polyoxyethylene ether sulfate, coconut oil, sodium chloride and calcium chloride.

[0031] Penetration must have osmotic pressure, that is, the capillary pressure in the concrete. The greater the surface tension difference between the solid-liquid, the smaller the wetting angle, and the greater the penetration ability into the capillary. The penetration depth of the crystalline active waterproofing coating is related to the depth of water carrying.

[0032] At the same time, the penetration depth of the waterproofing agent is not only related to the porosity of the base layer, but also related to the time that the active solution stays on the surface of the base layer. The more porous the base layer is, the longer the active material penetrates into the surface of the base layer, and the deeper the depth of the active material.

[0033] Anti-permeation pressure is one of the most important indicators to measure waterproof effect. Under normal circumstances, the crystallization generated by active substances in permeable crystalline waterproof material can fully fill the defects and voids of the surface layer of concrete, and make it a rigid waterproof layer with good anti-permeation performance.

[0034] In the present solution, the components such as sodium silicate, lithium silicate, copper silicate in the base react with water to form silicic acid gel, which fills the capillary pores of the concrete. The strong oxidizing property of potassium ferric alum and the cooperation with ferrous sulfate help to improve the setting speed, inhibit the corrosion process in the concrete, and improve the durability of the concrete. The addition of graphene slurry together with sodium chloride and calcium chloride is used to adjust the ionic strength of the waterproofing agent, which affects the penetration and crystallization process in the concrete. Not only does it improve the permeability of the waterproofing agent, but the microstructure of graphene also helps to improve the durability and structural stability of the concrete; coconut oil is used to improve the adhesion and flexibility of the waterproofing agent, thereby enhancing the bonding performance of the concrete with other materials.

[0035] The waterproofing agent of the present solution has strong permeability and strong water pressure resistance. After encountering water, it can produce secondary crystallization at the base defects, has the function of automatically repairing micro-cracks and other defects, is strong against base changes, is not easy to peel off and fall off, and can improve the compactness and physical and chemical properties of the concrete.

[0036] In some embodiments, the base includes, in parts by weight: 30-40 parts of sodium silicate, 20-30 parts of lithium silicate, 2-5 parts of copper silicate, 2-5 parts of ferrous sulfate, 2-5 parts of potassium ferric alum, and 20-40 parts of water.

[0037] In some embodiments, the auxiliary agent includes, in parts by weight: 0.5-1 parts of graphene slurry, 1-2 parts of sodium dodecyl sulfate, 10-20 parts of sodium toluene acid, 0.1-0.5 parts of anhydrous sodium citrate, 0.1-0.5 parts of sodium lauryl alcohol polyoxyethylene ether sulfate, 15-25 parts of coconut oil, 3-8 parts of sodium chloride, and 0.5-1 parts of calcium chloride.

[0038] Sodium toluene acid and anhydrous sodium citrate are used as early strength agents, sodium lauryl alcohol polyoxyethylene ether sulfate is used as a surfactant, coconut oil is used as a wetting agent, and the addition of graphene slurry together with sodium chloride and calcium chloride is used to adjust the ionic strength of the waterproofing agent, which affects the penetration and crystallization process in the concrete. Not only does it improve the permeability of the waterproofing agent, but the microstructure of graphene also helps to improve the durability and structural stability of the concrete.

[0039] In some embodiments, the weight ratio of the base to the auxiliary agent is 1: (0.01-0.05). Preferably, the weight ratio of the base to the auxiliary agent is 1:0.043.

[0040] In some embodiments, the solid content of the graphene slurry is 2wt %~5.0wt %, and the flake diameter of the graphene is 1μm~5μm. The solid content and flake diameter of the graphene slurry are conducive to uniform dispersion in the waterproofing agent, reducing the agglomeration phenomenon, and helping to improve the stability of the waterproofing agent under different environmental conditions, including temperature changes and humidity changes.

[0041] The second aspect of the present application provides a preparation method of a permeation crystallization waterproofing agent, comprising the following steps:

[0042] S1, sodium silicate, lithium silicate, copper silicate, ferrous sulfate, potassium dichromate are added to water and stirred at a speed of 400~600r / min for 10~20min, then heated, and cooled to room temperature to obtain a mixed solution A;

[0043] S2, mix graphene slurry, sodium lauryl polyoxyethylene ether sulfate, sodium dodecyl sulfate, coconut oil, anhydrous sodium citrate, and stir at a speed of 600~800r / min for 5~10min, then add sodium toluene, sodium chloride and calcium chloride, and stir at a speed of 200~300r / min for 8~12min to obtain a mixed solution B;

[0044] S3, add the mixed solution B to the mixed solution A, put it into a high-speed homogenizing shear machine at 2900rpm for 30min of shearing, and stand for 0.5~1h to obtain a permeation crystallization waterproofing agent.

[0045] In some embodiments, the heating in step S1 includes heating to 50~60℃ and holding for 1~2h.

[0046] In some embodiments, the preparation method of the graphene slurry comprises:

[0047] The graphene is modified by using a silane coupling agent containing a double bond to obtain modified graphene;

[0048] In some embodiments, 5-10 parts by weight of graphene, 3-8 parts by weight of silane coupling agent containing a double bond are added to 50-100 parts by weight of water and mixed uniformly, heated to 70-90℃ for 1-3h, after the reaction, the precipitate is taken by centrifugation, washed and dried to obtain modified graphene;

[0049] The modified graphene, fumaric acid and 2-methyl acrylamide are added to water and mixed and heated to react, then the initiator, surfactant and polyvinyl alcohol are added and heated to react, and the pH is adjusted to obtain a mixture;

[0050] 4-6 parts by weight of modified graphene, 1-3 parts by weight of fumaric acid, 1-3 parts by weight of 2-methyl acrylamide are added to 50-100 parts by weight of water and mixed uniformly, heated to 50-70℃ for 5-20 min, then 0.05-0.2 parts by weight of initiator, 0.1-0.5 parts by weight of surfactant, and 0.1-0.5 parts by weight of polyvinyl alcohol are added, and the reaction is maintained at 50-70℃ for 1-5 h. Adjust the pH to neutral with 0.5-1 mol / l sodium hydroxide solution to obtain a graphene-containing mixture;

[0051] The mixture is modified with mercaptopropyl triethoxysilane to obtain graphene containing mercapto groups. The graphene-containing mixture and the mercapto-containing mixture are mixed uniformly, the pH is adjusted to 8-9 with 20-25 wt% ammonia water, stirred at 1000-5000 r / min for 30-120 min, and left to stand for 4-6 h. After the reaction is completed, the precipitate is separated by centrifugation, washed, and dried to obtain graphene containing mercapto groups.

[0052] The graphene containing mercapto groups and 2,2-diallyl bisphenol A are mixed in ethyl acetate, benzoin dimethyl ether is added and mixed, and the reaction is carried out under ultraviolet light. After the reaction is completed, the product is washed, dried, and ball milled with water to obtain a graphene slurry.

[0053] 5-6 parts by weight of graphene containing mercapto groups, 8-10 parts by weight of 2,2-diallyl bisphenol A are added to 100-200 parts by weight of ethyl acetate and mixed uniformly, then 0.1-0.5 parts by weight of benzoin dimethyl ether is added and mixed uniformly, and the reaction is carried out at room temperature under 365 nm ultraviolet light for 20-40 min. After the reaction is completed, the product is washed, dried, and ball milled with water to obtain a graphene slurry.

[0054] The graphene slurry admixture interacts with other components to improve water-reducing performance, slump retention, early strength, and slow-release performance, and effectively disperses to have excellent adaptability to cement and concrete, and improves the morphology of cement and promotes the growth of cement hydration products, making the internal structure of cement mortar compact and further improving the compressive and flexural strength of cement mortar.

[0055] In some embodiments, the double-bond-containing silane coupling agent includes one of γ-(methacryloyloxy)propyl trimethoxysilane, γ-(ethylenediamino)propyl trimethoxysilane, and diethylenetriamine propyl trimethoxysilane.

[0056] In some embodiments, the preparation of graphene containing mercapto groups includes: adding mercaptopropyl triethoxysilane to ethyl acetate, adding tetraethyl orthosilicate and stirring to obtain a mercapto-containing mixture; mixing the mixture and the mercapto-containing mixture uniformly, adjusting the pH, stirring, standing for reaction, centrifuging to obtain the precipitate, washing, and drying to obtain graphene containing mercapto groups.

[0057] The prepared graphene slurry added into the penetration crystallization waterproofing agent can improve the water reducing performance, slump retention, early strength and slow release performance, the graphene is effectively dispersed, has excellent adaptability to cement and concrete, and improves the cement morphology and promotes the growth of cement hydration products, so that the internal structure of the cement mortar is compact, the compressive and bending strength of the cement mortar is further improved, and the water reducing agent can be dissociated from the hydrolysis center to maintain good neat mortar fluidity.

[0058] The technical solutions of the present application are further described in detail below in combination with specific embodiments, and it should be understood that the specific embodiments below are only used to explain the present application and do not limit the present application.

[0059] Embodiment 1

[0060] 35 parts of sodium silicate, 25 parts of lithium silicate, 3 parts of copper silicate, 3 parts of ferrous sulfate, and 4 parts of potassium dichromate were added to 30 parts of water, stirred at a speed of 500 r / min for 15 min, then heated to 55℃ and kept for 1 h, and cooled to room temperature to obtain a mixed solution A;

[0061] 5 parts of graphene and 3 parts of double bond containing silane coupling agent were added to water and mixed uniformly, heated to 80℃ and reacted for 1 h, then centrifuged to obtain the precipitate, washed and dried to obtain modified graphene; 5 parts of modified graphene, 2 parts of fumaric acid and 1 part of 2-methyl acrylamide were added to water and mixed uniformly, heated to 60℃ and reacted for 10 min, then 0.05-0.2 parts of initiator and 0.1-0.5 parts of surfactant were added, and then 0.1-0.5 parts of polyvinyl alcohol was added, and the reaction was kept at 60℃ for 2 h, and then the ph was adjusted to neutral with an alkaline solution to obtain a graphene-containing mixture;

[0062] The mixture was modified with mercaptopropyl triethoxysilane to obtain graphene containing mercapto; the graphene-containing mixture and the mercapto-containing mixture were mixed uniformly, the ph was adjusted to 9 with an alkaline solution, stirred at 1500 r / min for 40 min, and then left to stand for 5 h, after the reaction was completed, the precipitate was obtained by centrifugation, washed and dried to obtain graphene containing mercapto;

[0063] 5 parts of graphene containing mercapto and 10 parts of 2,2-diallyl bisphenol a were added to ethyl acetate and mixed uniformly, then 0.2 parts of benzoin dimethyl ether was added and mixed uniformly, and the reaction was carried out at room temperature under 365 nm ultraviolet light for 30 min, after the reaction was completed, the product was washed, dried, and then ball milled with water to prepare a slurry, the solid content of the graphene slurry was 3.0 wt %, the flake diameter of the graphene was 5 μm, and a graphene slurry was obtained;

[0064] Mix 0.3 parts of graphene slurry, 0.1 parts of sodium lauryl polyoxyethylene ether sulfate, 1 parts of sodium dodecyl sulfate, 20 parts of coconut oil, 0.13 parts of anhydrous sodium citrate, stir at 600 r / min for 5 min, then add 13 parts of sodium toluene, 4.7 parts of sodium chloride and 0.6 parts of calcium chloride, stir at 200 r / min for 10 min, to obtain mixed solution B;

[0065] Add mixed solution B to the mixed solution A, the weight ratio of mixed solution A and mixed solution B is 1:0043, 2900 rpm high-speed homogenizing shear machine for 30 minutes of shearing, stand for 0.5~1h, to obtain the penetration crystallization waterproofing agent.

[0066] Example 2

[0067] The graphene slurry used is a commercially available graphene slurry, purchased from Shanghai Limusheng New Material Technology Development Co., Ltd., and other reference to Example 1.

[0068] Comparative Example 1

[0069] Comparative Example 1 does not add graphene slurry, and other reference to Example 1. Comparative Example 2

[0070] Comparative Example 2 adds commercially available penetration crystallization waterproofing agent, purchased from Jinan Qingyuanyuan New Material Co., Ltd., and other reference to Example 1.

[0071] Performance test:

[0072] The penetration crystallization waterproofing agent obtained in the examples and comparative examples is added to the concrete (i.e. the concrete in the blank example) at a dosage of 7wt% (proportion of total weight of cementitious material) for performance testing. The test is carried out in accordance with GB18445-2012 "Cement-based Penetration and Crystallization Waterproofing Material", JC474-2008 "Mortar and Concrete Waterproofing Agent", JC / T 1018-2020 "Water-based Penetration Inorganic Waterproofing Agent", GBT 8077-2023 "Concrete Admixture Homogeneity Test Method", GB / T 50082-2009 "Standard for Long-term Performance and Durability Test Method of Ordinary Concrete", and GB / T 8077-2012 "Concrete Admixture Homogeneity Test Method", and the results are recorded:

[0073] Table 1: Test results of Examples 1~2 and Comparative Examples 1~2

[0074] Example 1 Example 2 Comparative Example 1 Comparative Example 2 Penetration height ratio / % 15 19 24 30 Shrinkage ratio / % 102 100 105 103 48h water absorption ratio / % 18 19 48 65 7d compressive strength ratio / % 125 123 115 113 28d compressive strength ratio / % 121 114 109 105 28d carbonization resistance value / % 46 34 30 29 150 times freeze-thaw compressive strength loss rate / % 5.2 7.1 7.5 8.0 Gelation time / min 162 174 280 320 Surface tension mN / m 27.2 29.6 30.5 33.0 PH value 11.38 11.86 11.53 12.0 Density / g / cm 3 ]] 1.132 1.120 1.101 1.108 Viscosity Comply Comply Comply Comply Storage stability (cycle 10 times) No change in appearance No change in appearance No change in appearance Slight precipitation Thermal resistance (160℃, 2h) No powdering, no cracks on the surface No powdering, no cracks on the surface Slightly powdering, no cracks Powdering, cracks on the surface alkali resistance (saturated Ca(OH)2solution, 168 h) No powdering, no cracks on the surface No powdering, no cracks on the surface No powdering, no cracks on the surface Powdering, cracks on the surface

[0075] From Table 1, it can be seen that the performance of Example 1 is the best, especially in terms of penetration resistance, early and long-term strength development, durability and surface tension, and the performance of Example 2 is also good, but slightly inferior to Example 1, and the performance of Comparative Examples 1 and 2 is relatively poor, especially in terms of penetration resistance and water absorption, which confirms that the waterproofing agent of the present application has strong penetration, strong water pressure resistance, can generate secondary crystallization at the defects of the base layer after encountering water, has the function of automatically repairing micro-cracks and other defects, is strong against base layer changes, is not easy to peel and fall off, and can improve the compactness and physical and chemical properties of the concrete.

[0076] It should be noted that the present application is not limited to the above-described embodiments. The above-described embodiments are only examples, and embodiments having substantially the same configuration and playing the same role and effect as the technical idea within the scope of the technical solution of the present application are all included in the technical scope of the present application. In addition, within the scope of the main idea of the present application, various modifications that can be thought of by those skilled in the art are applied to the embodiments, and other ways constructed by combining part of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. A penetrating crystalline water repellent agent, characterized by, The osmotic crystallization waterproofing agent comprises a base and an auxiliary agent; The base comprises 30-40 parts of sodium silicate, 20-30 parts of lithium silicate, 2-5 parts of copper silicate, 2-5 parts of ferrous sulfate, 2-5 parts of potassium dichromate and 20-40 parts of water in terms of weight parts; The auxiliary agent comprises 0.5-1 part of graphene slurry, 1-2 parts of sodium dodecyl sulfate, 10-20 parts of sodium toluene sulfonate, 0.1-0.5 part of anhydrous sodium citrate, 0.1-0.5 part of sodium lauryl ether sulfate, 15-25 parts of coconut oil, 3-8 parts of sodium chloride and 0.5-1 part of calcium chloride in terms of weight parts. The weight ratio of the base to the auxiliary agent is 1:(0.01-0.05).

2. The osmotic crystallization waterproofing agent according to claim 1, characterized by, The solid content of the graphene slurry is 2wt%-5.0wt%, wherein the flake diameter of graphene is 1μm-5μm.

3. A method for producing the osmotic crystallization waterproofing agent as claimed in any one of claims 1 to 2, characterized by, The method comprises the following steps: S1, sodium silicate, lithium silicate, copper silicate, ferrous sulfate, potassium dichromate are added to water and stirred at a speed of 400-600r / min for 10-20min, then heated and cooled to room temperature to obtain a mixed solution A; S2, graphene slurry, sodium lauryl ether sulfate, sodium dodecyl sulfate, coconut oil, anhydrous sodium citrate are mixed and stirred at a speed of 600-800r / min for 5-10min, then sodium toluene sulfonate, sodium chloride and calcium chloride are added and stirred at a speed of 200-300r / min for 8-12min to obtain a mixed solution B; S3, the mixed solution B is added to the mixed solution A and mixed, sheared and left to stand for 0.5-1h to obtain an osmotic crystallization waterproofing agent.

4. The method for producing a penetration crystalline waterproofing agent according to claim 3, characterized by, In step S1, the heating comprises heating to 50-60℃ and holding for 1-2h.

5. The method of claim 3, wherein the permeable crystalline waterproofing agent is prepared by adding the water-soluble polymer to the water-soluble inorganic salt and the water-soluble organic compound, and then adding the water-soluble organic compound to the mixture. The preparation method of the graphene slurry comprises: The graphene is modified by using a silane coupling agent containing a double bond to obtain modified graphene; The modified graphene, fumaric acid and 2-methyl acrylamide are added to water, mixed, heated and reacted, then an initiator, a surfactant and polyvinyl alcohol are added, heated and reacted, pH is adjusted and a mixture is obtained; The mixture is modified by using mercaptopropyl triethoxysilane to obtain graphene containing mercapto groups; The graphene containing mercapto groups and 2,2-diallyl bisphenol a are added to ethyl acetate, mixed, benzoin dimethyl ether is added, mixed, reacted under ultraviolet light, washed, dried, ball milled with water to prepare a slurry and graphene slurry is obtained.

6. The method of claim 5, wherein the permeable crystalline waterproofing agent is prepared by adding the water-soluble polymer to the water-soluble inorganic salt and the water-soluble organic compound, and then adding the water-soluble organic compound to the mixture. The silane coupling agent containing a double bond comprises one of γ-(methacryloyloxy)propyl trimethoxysilane, γ-(ethylenediamino)propyl trimethoxysilane and diethylenetriamine propyl trimethoxysilane.

7. The method of claim 5, wherein the method is characterized by, The preparation of the graphene containing mercapto groups comprises: mercaptopropyl triethoxysilane is added to ethyl acetate, tetraethyl orthosilicate is added and stirred to obtain a mixture containing mercapto groups; the mixture and the mixture containing mercapto groups are uniformly mixed, pH is adjusted, stirred, left to stand for reaction, centrifuged to obtain a precipitate, washed and dried to obtain graphene containing mercapto groups.