A composite waterproofing agent for internal penetration and external protection and its preparation method and application

Abstract

The present invention relates to an internal seepage-external protection composite waterproofing agent, comprising a curing system and an anti-seepage system, wherein the curing system is composed of a modified epoxy resin and a curing agent. The present invention also relates to a method for preparing an internal seepage-external protection composite waterproofing agent. The internal seepage-external protection composite waterproofing agent prepared by the present invention is sprayed on concrete, and a two-pronged strategy is adopted, which not only coats the concrete surface with a polymer material, but also relies on the properties of the concrete material to achieve a self-structural anti-corrosion that can be circulated and repaired, effectively improving the concrete's anti-seepage and long-term waterproofness, and extending the life cycle of the concrete in harsh environments.

Description

Technical Field

[0001] The invention belongs to the technical field of building structure and highway bridge engineering, and relates to a waterproofing agent for concrete anticorrosion, and in particular to an internal seepage-external protection composite waterproofing agent and a preparation method and application thereof. Background Art

[0002] Concrete plays an important role in modernization construction, and can be found in various infrastructure construction projects related to people's livelihood projects. However, ordinary concrete is a porous composite material with a porosity of generally between 10% and 20%. Due to water pressure or long-term penetration, water molecules will carry corrosive substances such as chloride ions and sulfate ions into the internal pores of the concrete. Over time, corrosion channels will spread inside the concrete and form continuous penetrations, eventually causing cracks, peeling or corrosion in the concrete during its life cycle. Therefore, waterproofing concrete in complex environments and reducing the exchange of substances between concrete and the external environment are crucial to improving the durability of concrete.

[0003] At present, the common anti-corrosion measure for concrete is to apply anti-corrosion coating on its surface, and the coating is mainly composed of polymer materials and silicone. The polymer material solidifies on the surface of concrete to form a dense protective film, which completely isolates the material exchange between the concrete and the external environment. The silicone material forms a hydrophobic molecular layer on the surface of concrete, reducing the probability of water molecule penetration, but the concrete is still breathable. The problem with these anti-corrosion measures is that they do not solve the problem of the compactness of the internal structure of concrete.

[0004] To sum up, for the anti-corrosion of concrete, it is necessary not only to protect the surface of concrete to prevent corrosion and invasion of environmental substances, but also to rely on the material properties of concrete itself to enhance its anti-permeability from the inside, solve the problem of water evaporation inside concrete, and incorporate water molecules into the system to enhance the density of concrete, forming a self-repairing cycle mechanism of water infiltration-active substance crystallization-closed channel-enhanced anti-permeability. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide an internal infiltration-external protection composite waterproofing agent and its preparation method and application. A two-pronged strategy is adopted, which not only coats the concrete surface with polymer materials, but also relies on the properties of concrete materials to achieve self-structural anti-corrosion that can be repaired in a recyclable manner, effectively improving the concrete's impermeability and long-term waterproofness, and extending the life cycle of concrete in harsh environments.

[0006] The present invention solves the technical problem by the following technical solutions:

[0007] An internal seepage-external protection composite waterproofing agent, comprising a curing system and an anti-seepage system,

[0008] The curing system is composed of a modified epoxy resin and a curing agent, and the composition and weight percentage of the curing agent are as follows:

[0009] Isocyanate 30%~50%

[0010] Polyether diol 10%~30%

[0011] Trimethylolpropane 5%~10%

[0012] Dibutyltin silicate 0.1%~1%

[0013] Solvent 25%~35%

[0014] The composition and weight percentage of the modified epoxy resin are:

[0015] Bisphenol A epoxy resin 60%~70%

[0016] Diethanolamine 10%~15%

[0017] Solvent 15%~25%;

[0018] The composition and mass percentage of the anti-seepage system are:

[0019] Deionized water 40%~58%

[0020] Crystalline component 35%~50%

[0021] Crystallization promoting component 1%~6%

[0022] Metal ion complexing agent 0.2%~2.6%

[0023] Defoaming agent 0.05%~1%

[0024] Antifreeze 0.05%~1%

[0025] Dispersant 0.02%~0.08%

[0026] Wetting agent 1%~3%.

[0027] Moreover, the solvents in the curing agent are xylene and butanone, and the solvent in the modified epoxy resin is acetone.

[0028] Moreover, the crystallization component is one or more of nano silicon dioxide with a particle size less than 20nm or sodium silicate with a modulus of 3-3.6; the crystallization-promoting component is formed by mixing triethanolamine and triisopropanolamine in a ratio of 1:3; the metal ion complexing agent is formed by mixing citric acid and disodium ethylenediaminetetraacetic acid in a ratio of 1:1; the defoaming agent is isopropanol; the antifreeze agent is ethylene glycol; the dispersant is one or more of dodecylethoxysulfobetaine and tetraethylammonium perfluorooctanesulfonate; and the wetting agent is polyethylene glycol.

[0029] A method for preparing an internal infiltration-external protection composite waterproofing agent, and preparing the internal infiltration-external protection composite waterproofing agent;

[0030] The preparation process of the curing agent is as follows: using xylene to dissolve isocyanate and polyether diol, using butanone to dissolve trimethylolpropane, adding isocyanate, polyether diol, and trimethylolpropane in order, and starting the first step reaction; 30 minutes after the first step reaction, adding a catalyst, the catalyst is dibutyltin disilicic acid, and the adding amount is 40% of the total amount of the catalyst added, and starting the second step reaction; 30 minutes after the second step reaction, continuing to add the catalyst, the adding amount is 60% of the total amount of the catalyst added, and starting the third step reaction; 30 minutes after the third step reaction, raising the system temperature to 80°C, keeping the temperature for reaction for 3 hours, and then discharging the material to obtain the curing agent;

[0031] The preparation process of the modified epoxy resin is as follows: at 70° C., bisphenol A epoxy resin is dissolved in acetone, diethanolamine-acetone solution is added dropwise after 20 minutes, and the material is cooled and discharged after reacting for 4 hours to obtain the modified epoxy resin;

[0032] The preparation process of the anti-seepage system is as follows: firstly, the components used are weighed according to the proportion; firstly, deionized water, crystallization component, dispersant and defoaming agent are added into a reactor, the temperature of the reactor is maintained at 55°C, the stirring speed is maintained at 400 r / min-600 r / min, and the stirring is stopped after 20 minutes of stirring and cooled to room temperature; after standing at room temperature for 2 hours-3 hours, the reactor is continuously added with materials, the order of adding materials is metal ion complexing agent, antifreeze agent, wetting agent and crystallization promoting component, the feeding interval is 2 minutes-3 minutes, the stirring speed is 200 r / min-300 r / min, and after the addition is completed, the materials are stirred for 20 minutes and then discharged to obtain the anti-seepage system.

[0033] The application of the internal infiltration-external protection composite waterproofing agent in concrete corrosion prevention is to first spray water at high pressure on the concrete surface to remove attached pollutants; after waiting for 1 day, spraying of the penetration system is started, and the spraying amount is 0.3 kg / cm 3; After curing for 2d~7d, the concrete surface is dry and you can start to apply the curing system. Before applying, mix the modified epoxy resin and curing agent in a mass ratio of 1:3, stir evenly and then apply. The amount of application is 0.2mm~0.5mm thick. After curing for 1d~2d, internal infiltration and external protection concrete corrosion protection can be achieved.

[0034] The positive effects that the present invention can produce are:

[0035] 1. The curing agent in the curing system of the present invention is synthesized from isocyanate, perfluoropolyether diol and trimethylolpropane, which gives the cured coating film the characteristics of super hydrophobicity, high strength, hydrolysis resistance, high resilience and good low temperature performance; the modified epoxy resin is synthesized from bisphenol A epoxy resin and diethanolamine, and secondary amine groups and more hydroxyl groups are introduced into the epoxy resin molecular chain, which gives the epoxy resin the characteristics of being able to cure quickly with the curing agent at room temperature and having strong adhesion to the concrete substrate.

[0036] 2. The anti-seepage system of the present invention is composed of a crystalline component, a crystallization-promoting component, a metal ion complexing agent, a defoaming agent, an antifreeze agent, a dispersant, and a wetting agent. The crystalline component closes the pores and enhances the compactness of the concrete; the crystallization-promoting component promotes the formation of calcium silicate gel by the crystalline component, water and concrete components; the metal ion complexing agent delays the crystallization reaction and migrates the metal ions from a high concentration to a low concentration area; the defoaming agent improves the fluidity and stability of the product during the preparation process; the antifreeze agent enables the material to be normally stored, transported and used in a severe cold environment; the dispersant stably disperses the crystalline component in the system and maintains the nanometer size; the wetting agent reduces the surface tension of the material on the concrete and enhances the penetration ability of the material inside the concrete.

[0037] 3. After the waterproofing agent of the present invention is sprayed on concrete, the concrete has the ability of cyclic self-repair. No matter the water evaporated from the inside of the concrete or the water infiltrated from the outside, it can participate as a reactant in the process of crystallization along the inner wall of the hole or capillary pore to the center. This process not only consumes water, but also enhances the compactness and impermeability of the concrete. In addition, the crystallization is equivalent to the concrete component and will not fall off, which also realizes the self-structural anti-corrosion of the concrete.

[0038] 4. The present invention adopts the technology of internal infiltration and external protection. It not only uses chemical means to convert the water invading the concrete into an important component to enhance the performance of the concrete, solving the problem of cracking or corrosion caused by the inability of the water in the concrete to escape; it also combines physical means to apply a layer of super-hydrophobic, high-strength, hydrolysis-resistant and highly resilient polymer material with good low-temperature performance on the surface of the concrete, further blocking the way for corrosive substances in the environment to penetrate into the concrete. The two-pronged approach implements comprehensive anti-corrosion of the concrete structure and effectively extends the life cycle of the concrete. DETAILED DESCRIPTION

[0039] The present invention is further described in detail below through specific examples. The following examples are only illustrative and not restrictive, and the protection scope of the present invention cannot be limited thereto.

[0040] Embodiment 1

[0041] In the embodiment of the present invention, the curing agent in the curing system is composed of the following components by weight: 300 g of toluene diisocyanate, 500 g of dicyclohexylmethane diisocyanate, 20 g and 100 g of perfluoropolyether diols with molecular weights of 500 and 1000, respectively, 80 g of trimethylolpropane, 2 g of dibutyltin dilaurate, 244 g of xylene, and 20 g of butanone.

[0042] The preparation process of the curing agent is:

[0043] S1. Take 244g of xylene and dissolve 300g of toluene diisocyanate and 500g of dicyclohexylmethane diisocyanate in a beaker. Take 20g of butanone and dissolve 80g of trimethylolpropane in a beaker.

[0044] S2. Transfer the xylene solution in the beaker to a four-necked flask equipped with a nitrogen-vented glass hollow tube, a thermometer, a water separator, and a reflux condenser. At the same time, add 20 g of a perfluoropolyether diol with a molecular weight of 500, 100 g of a perfluoropolyether diol with a molecular weight of 1000, and 100 g of a trimethylolpropane solution to the four-necked flask in sequence and react for 30 minutes.

[0045] S3. Add 0.8 g of dibutyltin silicate into the four-necked bottle and react for 30 minutes.

[0046] S4. Add 1.2 g of dibutyltin silicate into the four-necked bottle and react for 30 minutes.

[0047] S5. Raise the reaction temperature to 80°C, keep the reaction temperature for 3 hours and then discharge the material.

[0048] In the embodiment of the present invention, the modified epoxy resin in the curing system is composed of the following components by weight: 800 g of bisphenol A epoxy resin E-44, 200 g of diethanolamine, and 250 g of solvent.

[0049] The preparation process of the modified epoxy resin is:

[0050] S1. Add 800g of bisphenol A epoxy resin E-44 and 200g of acetone to a four-necked bottle equipped with a nitrogen-vented glass hollow tube, a thermometer, a water separator, and a reflux condenser, and fully dissolve E-44 at 70°C for 20 minutes. Dissolve 200g of diethanolamine in 50g of acetone in a beaker.

[0051] S2. Add diethanolamine-acetone solution dropwise into the system. After the addition is completed, react for 4 hours and then cool and discharge.

[0052] In the embodiment of the present invention, the anti-seepage system is composed of the following components by weight: 100g of nano-silicon dioxide, 350g of sodium silicate, 10g of triethanolamine, 30g of triisoethanolamine, 10g of citric acid, 10g of disodium ethylenediaminetetraacetic acid, 0.6g of dodecylethoxysulfobetaine, 8g of isopropanol, 6g of ethylene glycol, 30g of polyethylene glycol, and 445g of deionized water.

[0053] The preparation process of the anti-seepage system is:

[0054] S1. Weigh the required medicines mentioned above according to the proportion.

[0055] S2. Add 445 g of deionized water, 100 g of nano-silicon dioxide, 350 g of sodium silicate, 0.6 g of dodecylethoxysulfobetaine and 8 g of isopropanol into a reactor at a temperature of 55° C. The stirring speed is 500 r / min. After stirring for 20 min, stop stirring and cool to room temperature.

[0056] S3. Let stand at room temperature for 2h~3h.

[0057] S4. Add 10g of citric acid, 10g of disodium ethylenediaminetetraacetate, 6g of ethylene glycol, 30g of polyethylene glycol, 10g of triethanolamine and 30g of triisoethanolamine into the reactor in sequence. The feeding interval is 2 min to 3 min. The stirring speed is 250 r / min. After the feeding is completed, stir for 20 min and then discharge the material.

[0058] Embodiment 2

[0059] In the embodiment of the present invention, the curing agent in the curing system is composed of the following components by weight: 100 g toluene diisocyanate, 300 g hexamethylene diisocyanate, 400 g perfluoropolyether diol with a molecular weight of 2000, 95 g trimethylolpropane, 2 g dibutyltin diisocyanate, 343 g xylene, and 24 g butanone.

[0060] The preparation process of the curing agent is:

[0061] S1. Take 343 g of xylene and dissolve 100 g of toluene diisocyanate and 300 g of hexamethylene diisocyanate in a beaker. Take 24 g of butanone and dissolve 95 g of trimethylolpropane in a beaker.

[0062] S2. Transfer the xylene solution in the beaker to a four-necked flask equipped with a nitrogen-vented glass hollow tube, a thermometer, a water separator, and a reflux condenser. At the same time, add 400 g of a perfluoropolyether diol with a molecular weight of 2000 and 119 g of a trimethylolpropane solution to the four-necked flask in sequence and react for 30 minutes.

[0063] S3. Add 0.8 g of dibutyltin silicate into the four-necked bottle and react for 30 minutes.

[0064] S4. Add 1.2 g of dibutyltin silicate into the four-necked bottle and react for 30 minutes.

[0065] S5. Raise the reaction temperature to 80°C, keep the reaction temperature for 3 hours and then discharge the material.

[0066] In the embodiment of the present invention, the modified epoxy resin in the curing system is composed of the following components by weight: 850 g of bisphenol A epoxy resin E-44, 150 g of diethanolamine, and 250 g of solvent.

[0067] The preparation process of the modified epoxy resin is:

[0068] S1. Add 850g of bisphenol A epoxy resin E-44 and 213g of acetone to a four-necked bottle equipped with a nitrogen-vented glass hollow tube, a thermometer, a water separator, and a reflux condenser, and fully dissolve E-44 at 70°C for 20 minutes. Dissolve 150g of diethanolamine in 38g of acetone in a beaker.

[0069] S2. Add diethanolamine-acetone solution dropwise into the system. After the addition is completed, react for 4 hours and then cool and discharge.

[0070] In the embodiment of the present invention, the anti-seepage system is composed of the following components by weight: 500g of sodium silicate, 10g of triethanolamine, 30g of triisopropanolamine, 10g of citric acid, 10g of disodium ethylenediaminetetraacetic acid, 0.4g of dodecylethoxysulfobetaine, 0.4g of tetraethylammonium perfluorooctanesulfonate, 8g of isopropanol, 6g of ethylene glycol, 20g of polyethylene glycol, and 405g of deionized water.

[0071] The preparation process of the anti-seepage system is:

[0072] S1. Weigh the required medicines mentioned above according to the proportion.

[0073] S2. Add 405 g of deionized water, 500 g of sodium silicate, 0.6 g of dodecylethoxysulfobetaine, 0.4 g of tetraethylammonium perfluorooctanesulfonate, and 8 g of isopropanol into a reactor at a temperature of 55°C. Stir at a speed of 500 r / min. After stirring for 20 min, stop stirring and cool to room temperature.

[0074] S3. Let stand at room temperature for 2h~3h.

[0075] S4. Add 10g of citric acid, 10g of disodium ethylenediaminetetraacetate, 6g of ethylene glycol, 20g of polyethylene glycol, 10g of triethanolamine and 30g of triisopropanolamine into the reactor in order. The feeding interval is 2 min to 3 min. The stirring speed is 250 r / min. After the feeding is completed, stir for 20 min and then discharge the material.

[0076] Embodiment 3

[0077] In the embodiment of the present invention, the curing agent in the curing system is composed of the following components by weight: 350 g of dicyclohexylmethane diisocyanate, 100 g of hexamethylene diisocyanate, 20 g and 100 g of perfluoropolyether diols with molecular weights of 500 and 1000, respectively, 80 g of trimethylolpropane, 2 g of dibutyltin diisocyanate, 244 g of xylene, and 20 g of butanone.

[0078] The preparation process of the curing agent is:

[0079] S1. Take 244 g of xylene and dissolve 350 g of dicyclohexylmethane diisocyanate and 100 g of hexamethylene diisocyanate in a beaker. Take 20 g of butanone and dissolve 80 g of trimethylolpropane in a beaker.

[0080] S2. Transfer the xylene solution in the beaker to a four-necked flask equipped with a nitrogen-vented glass hollow tube, a thermometer, a water separator, and a reflux condenser. At the same time, add 20 g of a perfluoropolyether diol with a molecular weight of 500, 100 g of a perfluoropolyether diol with a molecular weight of 1000, and 100 g of a trimethylolpropane solution to the four-necked flask in sequence and react for 30 minutes.

[0081] S3. Add 0.8 g of dibutyltin silicate into the four-necked bottle and react for 30 minutes.

[0082] S4. Add 1.2 g of dibutyltin silicate into the four-necked bottle and react for 30 minutes.

[0083] S5. Raise the reaction temperature to 80°C, keep the reaction temperature for 3 hours and then discharge the material.

[0084] In the embodiment of the present invention, the modified epoxy resin in the curing system is composed of the following components by weight: 800 g of bisphenol A epoxy resin E-39, 200 g of diethanolamine, and 250 g of solvent.

[0085] The preparation process of the modified epoxy resin is:

[0086] S1. Add 800g of bisphenol A epoxy resin E-39 and 200g of acetone to a four-necked bottle equipped with a nitrogen-vented glass hollow tube, a thermometer, a water separator, and a reflux condenser, and fully dissolve E-39 at 70°C for 20 minutes. Dissolve 200g of diethanolamine in 50g of acetone in a beaker.

[0087] S2. Add diethanolamine-acetone solution dropwise into the system. After the addition is completed, react for 4 hours and then cool and discharge.

[0088] In the embodiment of the present invention, the anti-seepage system is composed of the following components by weight: 100g of nano-silicon dioxide, 350g of sodium silicate, 15g of triethanolamine, 45g of triisoethanolamine, 6g of citric acid, 6g of disodium ethylenediaminetetraacetic acid, 0.4g of dodecylethoxysulfobetaine, 0.4g of tetraethylammonium perfluorooctanesulfonate, 6g of isopropanol, 6g of ethylene glycol, 30g of polyethylene glycol, and 435g of deionized water.

[0089] The preparation process of the anti-seepage system is:

[0090] S1. Weigh the required medicines mentioned above according to the proportion.

[0091] S2. Add 435 g of deionized water, 100 g of nano-silicon dioxide, 350 g of sodium silicate, 0.4 g of dodecylethoxysulfobetaine, 0.4 g of tetraethylammonium perfluorooctanesulfonate, and 6 g of isopropanol into a reactor at a temperature of 55°C. Stir at a speed of 500 r / min. After stirring for 20 min, stop stirring and cool to room temperature.

[0092] S3. Let stand at room temperature for 2h~3h.

[0093] S4. Add 10g of citric acid, 6g of disodium ethylenediaminetetraacetate, 6g of ethylene glycol, 30g of polyethylene glycol, 15g of triethanolamine and 45g of triisoethanolamine into the reactor in sequence. The feeding interval is 2 min to 3 min. The stirring speed is 250 r / min. After the feeding is completed, stir for 20 min and then discharge the material.

[0094] Embodiment 4

[0095] In the embodiment of the present invention, the curing agent in the curing system is composed of the following components by weight: 420 g of toluene diisocyanate, 70 g and 200 g of perfluoropolyether diols with molecular weights of 500 and 2000 respectively, 95 g of trimethylolpropane, 2 g of dibutyltin dilaurate, 296 g of xylene, and 24 g of butanone.

[0096] The preparation process of the curing agent is:

[0097] S1. Take 296g of xylene and dissolve 420g of toluene diisocyanate in a beaker. Take 24g of butanone and dissolve 95g of trimethylolpropane in a beaker.

[0098] S2. Transfer the xylene solution in the beaker to a four-necked flask equipped with a nitrogen-vented glass hollow tube, a thermometer, a water separator, and a reflux condenser. At the same time, add 70 g of a perfluoropolyether diol with a molecular weight of 500, 200 g of a perfluoropolyether diol with a molecular weight of 2000, and 119 g of a trimethylolpropane solution to the four-necked flask in sequence and react for 30 minutes.

[0099] S3. Add 0.8 g of dibutyltin silicate into the four-necked bottle and react for 30 minutes.

[0100] S4. Add 1.2 g of dibutyltin silicate into the four-necked bottle and react for 30 minutes.

[0101] S5. Raise the reaction temperature to 80°C, keep the reaction temperature for 3 hours and then discharge the material.

[0102] In the embodiment of the present invention, the modified epoxy resin in the curing system is composed of the following components by weight: 850 g of bisphenol A epoxy resin E-39, 150 g of diethanolamine, and 250 g of solvent.

[0103] The preparation process of the modified epoxy resin is:

[0104] S1. Add 850g of bisphenol A epoxy resin E-39 and 213g of acetone to a four-necked bottle equipped with a nitrogen-vented glass hollow tube, a thermometer, a water separator, and a reflux condenser, and fully dissolve E-39 at 70°C for 20 minutes. Dissolve 150g of diethanolamine in 38g of acetone in a beaker.

[0105] S2. Add diethanolamine-acetone solution dropwise into the system. After the addition is completed, react for 4 hours and then cool and discharge.

[0106] In the embodiment of the present invention, the anti-seepage system is composed of the following components by weight: 500g of sodium silicate, 15g of triethanolamine, 45g of triisoethanolamine, 6g of citric acid, 6g of disodium ethylenediaminetetraacetic acid, 0.6g of dodecylethoxysulfobetaine, 6g of isopropanol, 6g of ethylene glycol, 20g of polyethylene glycol, and 395g of deionized water.

[0107] The preparation process of the anti-seepage system is:

[0108] S1. Weigh the required medicines mentioned above according to the proportion.

[0109] S2. Add 395 g of deionized water, 500 g of sodium silicate, 0.6 g of dodecylethoxysulfobetaine and 6 g of isopropanol into a reactor at a temperature of 55°C, stir at a speed of 500 r / min, stir for 20 min, then stop stirring and cool to room temperature.

[0110] S3. Let stand at room temperature for 2h~3h.

[0111] S4. Add 6 g of citric acid, 6 g of disodium ethylenediaminetetraacetate, 6 g of ethylene glycol, 20 g of polyethylene glycol, 15 g of triethanolamine and 45 g of triisoethanolamine into the reactor in order. The feeding interval is 2 min to 3 min. The stirring speed is 250 r / min. After the feeding is completed, stir for 20 min and then discharge the material.

[0112] The waterproofing agent prepared in the above Examples 1 to 4 was sprayed on the concrete. First, high-pressure water was sprayed on the concrete surface to remove the attached pollutants. After waiting for 1 day, the penetration system was sprayed, and the spraying amount was 0.3 kg / cm 3 ; After curing for 2d~7d, the concrete surface is dry and you can start to apply the curing system. Before applying, mix the modified epoxy resin and curing agent in a mass ratio of 1:3, stir evenly and then apply. The amount of application is 0.2mm~0.5mm thick. After curing for 1d~2d, internal infiltration and external protection concrete corrosion protection can be achieved.

[0113] The performance test was conducted on the concrete standard specimens cured for 28 days in the above-mentioned embodiments 1 to 4, and the concrete without the spraying of the waterproofing agent of the present invention was set as a blank control. The performance indicators are shown in Table 1:

[0114] Table 1 Concrete performance test table

[0115]

[0116] As shown in Table 1, the impermeability of the post-treated concrete specimens is significantly improved. The curing agent with isocyanate monomer as the main curing monomer is cross-linked and cured with modified epoxy resin on the concrete surface to form a dense interpenetrating network, and the super-hydrophobicity of perfluoropolyether diol also reduces the probability of water staying on the coating surface, effectively isolating the material exchange between concrete and the external environment. Under the action of wetting agent and dispersant, the infiltration crystal component allows more crystal components to penetrate into the deeper position of concrete, and relies on the concrete skeleton to grow crystals and block pores or capillaries. The compactness of the concrete surface is enhanced, the porosity is reduced, and the concrete surface hardness is improved at the same time, and its compressive strength is also improved therewith, realizing the self-structural anti-corrosion of concrete. The infiltration-external composite waterproofing agent of the present invention can effectively improve the waterproof performance of concrete.

[0117] Although the embodiments of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments.

Claims

1. An internal seepage-external protection composite waterproofing agent, characterized in that: Including curing system and anti-seepage system, The curing system is composed of a modified epoxy resin and a curing agent, and the composition and weight percentage of the curing agent are as follows: Isocyanate 30%~50% Polyether diol 10%~30% Trimethylolpropane 5%~10% Dibutyltin silicate 0.1%~1% Solvent 25%~35% The composition and weight percentage of the modified epoxy resin are: Bisphenol A epoxy resin 60%~70% Diethanolamine 10%~15% Solvent 15%~25%; The composition and mass percentage of the anti-seepage system are: Deionized water 40%~58% Crystalline component 35%~50% Crystallization promoting component 1%~6% Metal ion complexing agent 0.2%~2.6% Defoaming agent 0.05%~1% Antifreeze 0.05%~1% Dispersant 0.02%~0.08% Wetting agent 1%~3%; The crystallization component is one or more of nano silicon dioxide with a particle size less than 20 nm or sodium silicate with a modulus of 3 to 3.6; the crystallization-promoting component is formed by mixing triethanolamine and triisopropanolamine in a ratio of 1:3; the metal ion complexing agent is formed by mixing citric acid and disodium ethylenediaminetetraacetic acid in a ratio of 1:1; the defoaming agent is isopropanol; the antifreeze agent is ethylene glycol; the dispersant is one or more of dodecylethoxysulfobetaine and tetraethylammonium perfluorooctanesulfonate; and the wetting agent is polyethylene glycol.

2. The internal infiltration-external protection composite waterproofing agent according to claim 1, characterized in that: The solvents in the curing agent are xylene and butanone, and the solvent in the modified epoxy resin is acetone.

3. A method for preparing an internal infiltration-external protection composite waterproofing agent, characterized in that: Prepare the internal infiltration-external protection composite waterproofing agent as described in any one of claims 1 and 2; The preparation process of the curing agent is as follows: using xylene to dissolve isocyanate and polyether diol, using butanone to dissolve trimethylolpropane, adding isocyanate, polyether diol, and trimethylolpropane in order, and starting the first step reaction; after the first step reaction for 30 minutes, adding a catalyst, the catalyst is dibutyltin disilicic acid, and the addition amount is 40% of the total addition amount of the catalyst, and starting the second step reaction; after the second step reaction for 30 minutes, continuing to add the catalyst, the addition amount is 60% of the total addition amount of the catalyst, and starting the third step reaction; after the third step reaction for 30 minutes, raising the system temperature to 80°C, keeping the temperature for reaction for 3 hours, and then discharging the material to obtain the curing agent; The preparation process of the modified epoxy resin is as follows: at 70° C., bisphenol A epoxy resin is dissolved in acetone, diethanolamine-acetone solution is added dropwise after 20 minutes, and the material is cooled and discharged after reacting for 4 hours to obtain the modified epoxy resin; The preparation process of the anti-seepage system is as follows: firstly, the components used are weighed according to the proportion; firstly, deionized water, crystallization component, dispersant and defoaming agent are added into a reactor, the temperature of the reactor is maintained at 55°C, the stirring speed is maintained at 400 r / min-600 r / min, and the stirring is stopped after 20 minutes of stirring and cooled to room temperature; after standing at room temperature for 2 hours-3 hours, the reactor is continuously added with materials, the order of adding materials is metal ion complexing agent, antifreeze agent, wetting agent and crystallization promoting component, the feeding interval is 2 minutes-3 minutes, the stirring speed is 200 r / min-300 r / min, and after the addition is completed, the materials are stirred for 20 minutes and then discharged to obtain the anti-seepage system.

4. An application of the internal infiltration-external protection composite waterproofing agent as claimed in any one of claims 1 and 2 in concrete corrosion prevention, firstly spraying water at high pressure on the concrete surface to remove attached pollutants; after waiting for 1 day, spraying of the penetration system is started, and the spraying amount is 0.3 kg / cm 3 ; After curing for 2d~7d, the concrete surface is dry and you can start to apply the curing system. Before applying, mix the modified epoxy resin and curing agent in a mass ratio of 1:3, stir evenly and then apply. The amount of application is 0.2mm~0.5mm thick. After curing for 1d~2d, internal infiltration and external protection concrete corrosion protection can be achieved.

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