Reinforcing agent as well as preparation method and application thereof

Abstract

The invention discloses a reinforcing agent as well as a preparation method and application thereof, and relates to the technical field of concrete surface protective coatings, and the reinforcing agent is prepared by modifying industrial materials such as graphene oxide, nano titanium dioxide and nano silicon dioxide. According to the invention, the improvement of the compactness of the microstructure of the concrete coating is taken as a technical means, the conventional concrete coating is subjected to nanocrystallization modification, the nano-hybrid multi-effect interface reinforcing agent is obtained, and the anti-permeability and durability of the concrete coating are improved while the micro porosity and compactness of the concrete coating are improved.

Description

Technical Field

[0001] The invention relates to the technical field of concrete surface protective coatings, and in particular to a reinforcing agent and a preparation method and application thereof. Background Art

[0002] Concrete is a widely used structural material in modern buildings. It has the characteristics of good water resistance, rich sources of component materials, good economy, can be designed and built into any shape and size, and can be used in combination with steel. However, when concrete is used in tropical marine environments, harsh working conditions and other environments, concrete structures such as buildings, bridges, and docks are prone to surface degradation and cracking, which reduces their durability and brings about subsequent safety problems. Therefore, it is necessary to improve the durability and corrosion resistance of concrete. As one of the important technologies for corrosion protection of concrete structures, concrete coatings play an important role in extending the service life of structures and improving durability and stability. Common concrete coatings include epoxy resin coatings, chlorinated rubber coatings, polyurethane coatings, etc. Although these materials have certain anti-corrosion properties in practical applications, they have limitations such as poor carbonization resistance, insufficient durability, and stability that needs to be improved.

[0003] In order to improve the durability of concrete structures and extend the service life of structures, studying different types of high-performance concrete coatings (including different additives, modified materials, etc.) has become one of the solutions. Although graphene oxide (GO) has been widely used in fields such as concrete coatings, it still cannot significantly improve the corrosion resistance and durability of the material when used alone. Graphene oxide (GO) and titanium dioxide (TiO2) are also used in concrete coatings. However, they are all applications of specific materials to specific systems and specific formulas. There is a lack of versatility for different existing coating systems, and they only meet laboratory high-purity material tests and industrial materials cannot be applied. In addition, the existing concrete coating modification technology still has room for improvement in terms of carbonization resistance, permeability resistance, stability, etc. Summary of the invention

[0004] The purpose of the present invention is to provide an enhancer and a preparation method and application thereof in order to solve the above problems.

[0005] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0006] A reinforcing agent, comprising graphene oxide, nano titanium dioxide and nano silicon dioxide, wherein the graphene oxide, the nano titanium dioxide and the nano silicon dioxide are all industrial-grade raw materials; the weight portion of the graphene oxide is 98.0 to 140.1 parts, the particle size is 1 to 5 nm, and the specific surface area is ≥2000 m 2 / g; The weight parts of the nano-titanium dioxide are 99.8 to 140.6 parts, the particle size is 10 to 30 nm, and the specific surface area is ≥160 m 2 / g; The weight parts of the nano-silica are 99.5 to 140.4 parts, the particle size is 10 to 50 nm, and the specific surface area is 150 to 300 m 2 / g.

[0007] A preparation method of an enhancer, the preparation method comprising the following steps:

[0008] (1) Prepare the precursor titanium dioxide. First, uniformly add the nano-titanium dioxide into absolute ethanol, then perform ultrasonic dispersion for 1 to 2 h by an ultrasonic disperser, then perform constant-temperature water bath stirring at 75 to 80 °C, the stirring speed is 200 to 500 rpm, and deionized water is slowly added dropwise during stirring, the dropping speed <1 g / min. After the dropping is completed, increase the stirring speed to 1000 to 1500 rpm, then react for 5.5 to 6.5 h to obtain a homogeneous solution. Then, centrifuge and wash the obtained homogeneous solution with absolute ethanol 3 times. Then, place the obtained white substance in a vacuum drying oven for constant-temperature drying, the drying temperature is 55 to 65 °C, and the drying time is 24 to 30 h to obtain the precursor titanium dioxide;

[0009] (2) Prepare the precursor graphene oxide-titanium dioxide. First, add the precursor titanium dioxide prepared in step (1) into an N,N-dimethylformamide solution with a solution concentration of 0.4 to 0.6 mg / ml, then perform ultrasonic dispersion for 1 to 2 h by an ultrasonic disperser to obtain a uniform suspension solution. Then, add the pre-dispersed graphene oxide into the suspension solution. Then, heat the suspension solution in an oil bath at 100 to 110 °C while stirring and dispersing for 4.5 to 5.5 h to obtain a solution. Then, centrifuge and wash the obtained solution with absolute ethanol 5 times. Then, place the obtained white substance in a vacuum drying oven for constant-temperature drying, the drying temperature is 55 to 65 °C, and the drying time is 24 to 30 h to obtain the precursor graphene oxide-titanium dioxide;

[0010] (3) Prepare the enhancer. Add the nano-silica into ethyl acetate, and perform ultrasonic dispersion for 0.5 to 1 h by an ultrasonic disperser to make the nano-silica uniformly dispersed to obtain a solution. Then, add the precursor graphene oxide-titanium dioxide prepared in step (2) into the obtained solution, and then perform ultrasonic dispersion for 24 to 30 h by an ultrasonic disperser to obtain the enhancer.

[0011] Preferably, the weight part ratio of the nano-titanium dioxide, absolute ethanol and deionized water in step (1) is 1:315:28.

[0012] Preferably, in step (2), the weight ratio of pre-dispersed graphene oxide to precursor titanium dioxide is 2:1 to 4:1.

[0013] The application of a reinforcing agent, the reinforcing agent can be applied to polyurethane, chlorinated rubber or epoxy resin, and the reinforcing agent is added to the resin component of the organic coating of polyurethane, chlorinated rubber or epoxy resin through a functional material.

[0014] Preferably, the mixing method is as follows: First, add the reinforcing agent to the resin component of the organic coating of polyurethane, chlorinated rubber or epoxy resin, and then stir and disperse at 23 - 27 °C for 0.5 - 1 h, with a stirring speed of 200 - 500 rpm to obtain a composite modified resin component; then, mix and stir according to the specified curing agent ratio of different types of coatings respectively. Finally, obtain a modified concrete coating, and apply the modified concrete coating on the concrete surface to form a modified protective coating.

[0015] Preferably, the addition ratio of the reinforcing agent is 0.1% - 0.5%.

[0016] The beneficial effects of the present invention are as follows: (1) The reinforcing agent of the present invention can be directly applied to the existing concrete coatings to improve the anti-permeability and durability of the concrete coatings. (2) The preparation of the reinforcing agent is all made from industrial-grade raw materials without the need for laboratory high-purity materials, and it has strong practicability. (3) The reinforcing agent can improve the anti-carbonation ability of the existing concrete coatings and the compactness of the coating microstructure. (4) The reinforcing agent has good versatility and can be used in different organic coating systems of polyurethane, chlorinated rubber and epoxy resin. (5) The preparation method of the reinforcing agent has strong adaptability, is compatible with the existing coating system, and the resin system modification does not need to be prepared separately in the factory. Description of the Drawings

[0017] Figure 1 It is the infrared spectrum diagram of the existing graphene oxide and the reinforcing agent of the present invention;

[0018] Figure 2 It is the thermogravimetric analysis diagram of the existing graphene oxide and the reinforcing agent of the present invention;

[0019] Figure 3 It is the surface morphology diagram of the polyurethane composite coating after adding the reinforcing agent of the present invention;

[0020] Figure 4 It is the surface morphology diagram of the chlorinated rubber composite coating after adding the reinforcing agent of the present invention;

[0021] Figure 5 It is the surface morphology diagram of the epoxy resin composite coating after adding the reinforcing agent of the present invention. Detailed Description of the Invention

[0022] The present invention provides a reinforcing agent, which includes graphene oxide, nano-titanium dioxide and nano-silica, and graphene oxide, nano-titanium dioxide and nano-silica are all industrial-grade raw materials. Among them, the weight fraction of graphene oxide is 98.0 - 140.1 parts, the particle size is 1 - 5 nm, and the specific surface area ≥ 2000 m 2 / g; the weight fraction of nano-titanium dioxide is 99.8 - 140.6 parts, the particle size is 10 - 30 nm, and the specific surface area ≥ 160 m 2 / g; the weight fraction of nano-silica is 99.5 - 140.4 parts, the particle size is 10 - 50 nm, and the specific surface area is 150 - 300 m 2 / g.

[0023] Example 1

[0024] A preparation method of a reinforcing agent, the preparation method includes the following steps: (1) Prepare the precursor titanium dioxide. First, uniformly add nano-titanium dioxide into absolute ethanol, then, perform ultrasonic dispersion for 1 h through an ultrasonic disperser, then, perform constant-temperature water bath stirring at 75 °C, the stirring speed is 200 rpm, slowly dropwise add deionized water during stirring, the dropping speed < 1 g / min, after the dropping is completed, increase the stirring speed to 1000 rpm, then, react for 5.5 h to obtain a homogeneous solution, then, centrifuge and wash the obtained homogeneous solution with absolute ethanol 3 times, then, place the obtained white substance in a vacuum drying oven for constant-temperature drying, the drying temperature is 55 °C, and the drying time is 24 h to obtain the precursor titanium dioxide. Among them, the weight fraction ratio of nano-titanium dioxide, absolute ethanol and deionized water is 1:315:28. (2) Prepare the precursor graphene oxide - titanium dioxide. First, add the precursor titanium dioxide prepared in step (1) into an N,N-dimethylformamide solution with a solution concentration of 0.4 mg / ml, then, perform ultrasonic dispersion for 1 h through an ultrasonic disperser to obtain a uniform suspension solution, then, add the pre-dispersed graphene oxide into the suspension solution, then, heat the suspension solution in an oil bath at 100 °C while stirring and dispersing for 4.5 h to obtain a solution, then, centrifuge and wash the obtained solution with absolute ethanol 5 times, then, place the obtained white substance in a vacuum drying oven for constant-temperature drying, the drying temperature is 55 °C, and the drying time is 24 h to obtain the precursor graphene oxide - titanium dioxide. Among them, the weight fraction ratio of the pre-dispersed graphene oxide to the precursor titanium dioxide is 2:1. (3) Prepare the reinforcing agent. Add nano-silica into ethyl acetate, perform ultrasonic dispersion for 0.5 h through an ultrasonic disperser to make the nano-silica uniformly dispersed to obtain a solution, then, add the precursor graphene oxide - titanium dioxide prepared in step (2) into the obtained solution, then, perform ultrasonic dispersion for 24 h through an ultrasonic disperser to obtain the reinforcing agent.

[0025] Application of a reinforcing agent. The reinforcing agent can be applied to polyurethane, chlorinated rubber or epoxy resin. The reinforcing agent is added to the resin component of the organic coating of polyurethane, chlorinated rubber or epoxy resin through a functional material. The mixing method is as follows: First, add the reinforcing agent to the resin component of the organic coating of polyurethane, chlorinated rubber or epoxy resin. Then, stir and disperse at 23°C for 0.5 h with a stirring speed of 200 rpm to obtain a composite modified resin component. Then, mix and stir according to the specified curing agent ratio of different types of coatings respectively. Finally, obtain a modified concrete coating, and apply the modified concrete coating on the concrete surface to form a modified protective coating. Among them, the addition ratio of the reinforcing agent is 0.1%.

[0026] Example Two

[0027] Preparation method of a reinforcing agent. The preparation method includes the following steps: (1) Prepare the precursor titanium dioxide. First, uniformly add nano-titanium dioxide into anhydrous ethanol. Then, perform ultrasonic dispersion for 1.4 h through an ultrasonic disperser. Then, carry out constant-temperature water bath stirring at 77°C with a stirring speed of 300 rpm. Slowly dropwise add deionized water during stirring with a dropping speed <1 g / min. After the dropping is completed, increase the stirring speed to 1300 rpm. Then, react for 5.8 h to obtain a homogeneous solution. Then, centrifuge and wash the obtained homogeneous solution with anhydrous ethanol 3 times. Then, place the obtained white substance in a vacuum drying oven for constant-temperature drying. The drying temperature is 57°C and the drying time is 26 h to obtain the precursor titanium dioxide. Among them, the weight ratio of nano-titanium dioxide, anhydrous ethanol and deionized water is 1:315:28. (2) Prepare the precursor graphene oxide-titanium dioxide. First, add the precursor titanium dioxide prepared in step (1) into an N,N-dimethylformamide solution with a solution concentration of 0.4 mg / ml. Then, perform ultrasonic dispersion for 1.4 h through an ultrasonic disperser to obtain a uniform suspension solution. Then, add the pre-dispersed graphene oxide into the suspension solution. Then, heat the suspension solution in an oil bath at 104°C while stirring and dispersing for 4.8 h to obtain a solution. Then, centrifuge and wash the obtained solution with anhydrous ethanol 5 times. Then, place the obtained white substance in a vacuum drying oven for constant-temperature drying. The drying temperature is 58°C and the drying time is 26 h to obtain the precursor graphene oxide-titanium dioxide. Among them, the weight ratio of the pre-dispersed graphene oxide to the precursor titanium dioxide is 2:1. (3) Prepare the reinforcing agent. Add nano-silica into ethyl acetate and perform ultrasonic dispersion for 0.7 h through an ultrasonic disperser to make the nano-silica uniformly dispersed to obtain a solution. Then, add the precursor graphene oxide-titanium dioxide prepared in step (2) into the obtained solution. Then, perform ultrasonic dispersion for 27 h through an ultrasonic disperser to obtain the reinforcing agent.

[0028] Application of a reinforcing agent. The reinforcing agent can be applied to polyurethane, chlorinated rubber or epoxy resin. The reinforcing agent is added to the resin component of the polyurethane, chlorinated rubber or epoxy resin organic coating through a functional material. The mixing method is as follows: First, add the reinforcing agent to the resin component of the polyurethane, chlorinated rubber or epoxy resin organic coating. Then, stir and disperse at 25°C for 0.7 h at a stirring speed of 300 rpm to obtain a composite modified resin component. Then, mix and stir according to the specified curing agent ratio of different types of coatings respectively. Finally, obtain a modified concrete coating, and apply the modified concrete coating on the concrete surface to form a modified protective coating. Among them, the addition ratio of the reinforcing agent is 0.3%.

[0029] Example 3

[0030] A preparation method of a reinforcing agent, which includes the following steps: (1) Prepare the precursor titanium dioxide. First, uniformly add nano-titanium dioxide into absolute ethanol, then perform ultrasonic dispersion for 1.7 h through an ultrasonic disperser, then perform constant-temperature water bath stirring at 78°C at a stirring speed of 400 rpm. During stirring, slowly dropwise add deionized water at a dropping speed of <1 g / min. After the dropping is completed, increase the stirring speed to 1400 rpm, and then react for 6.2 h to obtain a homogeneous solution. Then, centrifuge and wash the obtained homogeneous solution with absolute ethanol 3 times. Then, place the obtained white substance in a vacuum drying oven for constant-temperature drying. The drying temperature is 63°C and the drying time is 28 h to obtain the precursor titanium dioxide. Among them, the weight ratio of nano-titanium dioxide, absolute ethanol and deionized water is 1:315:28. (2) Prepare the precursor graphene oxide-titanium dioxide. First, add the precursor titanium dioxide prepared in step (1) into an N,N-dimethylformamide solution with a solution concentration of 0.5 mg / ml, then perform ultrasonic dispersion for 1.7 h through an ultrasonic disperser to obtain a uniform suspension solution. Then, add the pre-dispersed graphene oxide into the suspension solution. Then, heat the suspension solution in an oil bath at 107°C while stirring and dispersing for 5.2 h to obtain a solution. Then, centrifuge and wash the obtained solution with absolute ethanol 5 times. Then, place the obtained white substance in a vacuum drying oven for constant-temperature drying. The drying temperature is 63°C and the drying time is 28 h to obtain the precursor graphene oxide-titanium dioxide. Among them, the weight ratio of the pre-dispersed graphene oxide to the precursor titanium dioxide is 3:1. (3) Prepare the reinforcing agent. Add nano-silica into ethyl acetate and perform ultrasonic dispersion for 0.8 h through an ultrasonic disperser to make the nano-silica uniformly dispersed to obtain a solution. Then, add the precursor graphene oxide-titanium dioxide prepared in step (2) into the obtained solution, and then perform ultrasonic dispersion for 28 h through an ultrasonic disperser to obtain the reinforcing agent.

[0031] Application of a reinforcing agent. The reinforcing agent can be applied to polyurethane, chlorinated rubber or epoxy resin. The reinforcing agent is added to the resin component of the polyurethane, chlorinated rubber or epoxy resin organic coating through a functional material. The mixing method is as follows: First, add the reinforcing agent to the resin component of the polyurethane, chlorinated rubber or epoxy resin organic coating. Then, stir and disperse at 25°C for 0.8 h with a stirring speed of 300 rpm to obtain a composite modified resin component. Then, mix and stir according to the specified curing agent ratio of different types of coatings respectively. Finally, obtain a modified concrete coating, and form a modified protective coating after coating the modified concrete coating on the concrete surface. Among them, the addition ratio of the reinforcing agent is 0.4%.

[0032] Example 4

[0033] Preparation method of a reinforcing agent. The preparation method includes the following steps: (1) Prepare the precursor titanium dioxide. First, uniformly add nano-titanium dioxide into absolute ethanol. Then, perform ultrasonic dispersion for 2 h through an ultrasonic disperser. Then, carry out constant-temperature water bath stirring at 80°C with a stirring speed of 500 rpm. During stirring, slowly dropwise add deionized water with a dropping speed < 1 g / min. After the dropping is completed, increase the stirring speed to 1500 rpm. Then, react for 6.5 h to obtain a homogeneous solution. Then, centrifuge and wash the obtained homogeneous solution with absolute ethanol 3 times. Then, place the obtained white substance in a vacuum drying oven for constant-temperature drying. The drying temperature is 65°C and the drying time is 30 h to obtain the precursor titanium dioxide. Among them, the weight ratio of nano-titanium dioxide, absolute ethanol and deionized water is 1:315:28. (2) Prepare the precursor graphene oxide-titanium dioxide. First, add the precursor titanium dioxide prepared in step (1) into an N,N-dimethylformamide solution with a solution concentration of 0.6 mg / ml. Then, perform ultrasonic dispersion for 2 h through an ultrasonic disperser to obtain a uniform suspension solution. Then, add the pre-dispersed graphene oxide into the suspension solution. Then, heat the suspension solution in an oil bath at 110°C while stirring and dispersing for 5.5 h to obtain a solution. Then, centrifuge and wash the obtained solution with absolute ethanol 5 times. Then, place the obtained white substance in a vacuum drying oven for constant-temperature drying. The drying temperature is 65°C and the drying time is 30 h to obtain the precursor graphene oxide-titanium dioxide. Among them, the weight ratio of the pre-dispersed graphene oxide to the precursor titanium dioxide is 4:1. (3) Prepare the reinforcing agent. Add nano-silica into ethyl acetate and perform ultrasonic dispersion for 1 h through an ultrasonic disperser to make the nano-silica uniformly dispersed to obtain a solution. Then, add the precursor graphene oxide-titanium dioxide prepared in step (2) into the obtained solution. Then, perform ultrasonic dispersion for 30 h through an ultrasonic disperser to obtain the reinforcing agent.

[0034] Application of a reinforcing agent. The reinforcing agent can be applied to polyurethane, chlorinated rubber or epoxy resin. The reinforcing agent is added to the resin component of the organic coating of polyurethane, chlorinated rubber or epoxy resin through a functional material. The mixing method is as follows: First, add the reinforcing agent to the resin component of the organic coating of polyurethane, chlorinated rubber or epoxy resin. Then, stir and disperse at 27 °C for 1 h at a stirring speed of 500 rpm to obtain a composite modified resin component. Then, mix and stir according to the specified curing agent ratio of different types of coatings respectively. Finally, obtain a modified concrete coating, and apply the modified concrete coating on the concrete surface to form a modified protective coating. Among them, the addition ratio of the reinforcing agent is 0.5%.

[0035] Performance test

[0036] As Figure 1 shown, the existing graphene oxide and the reinforcing agent of the present invention are detected by an infrared spectrometer, and the following can be obtained:

[0037] (1) In the existing graphene oxide, the O-H stretching vibration peak is at 3189.4, while in the reinforcing agent of the present invention, this peak moves to 3191.8. This indicates that in the composite material, due to the interaction between titanium dioxide and the hydroxyl groups on the surface of graphene oxide, the environment of the hydroxyl groups has changed.

[0038] (2) The existing graphene oxide has a C=O stretching vibration peak at 1725.5. In the reinforcing agent of the present invention, the new vibration peaks (such as at 1918.2 and 1707.9) mean that the addition of titanium dioxide has changed the chemical environment of the carbonyl group in graphene oxide, and there are new chemical bondings or interactions.

[0039] (3) The existing graphene oxide has a C-O stretching vibration peak at 1227.2. In the reinforcing agent of the present invention, the peak at 1222.7 may be related to the C-O bond, indicating that there is an interaction between titanium dioxide and graphene oxide. In the reinforcing agent of the present invention, the peaks at 1623.1, 1426.3, 1058 and 947.7 may be related to the vibration mode of titanium dioxide. The appearance of these peaks indicates that titanium dioxide has been successfully bonded to graphene oxide.

[0040] (4) It can be seen from the infrared spectrum that the spectrum of the reinforcing agent of the present invention is more complex and has more absorption peaks. This indicates that the addition of titanium dioxide has changed the chemical structure of graphene oxide, introducing new chemical bonds and vibration modes. From the shift of the peak positions and the appearance of new peaks, it can be inferred that there are chemical bonds such as hydrogen bonds and covalent bonds between titanium dioxide and graphene oxide. These bonding methods help to improve the stability and performance of the reinforcing agent.

[0041] As Figure 2As shown in the figure, the existing graphene oxide and the enhancer of the present invention are detected by a thermogravimetric analyzer, and the following results can be obtained:

[0042] There are two stages of mass loss during the heating process of the existing graphene oxide: the first stage is around 0 - 160 °C, and the mass loss in this stage is mainly due to the loss of adsorbed water in the graphene oxide and the volatilization of some low-boiling impurities; the second stage is around 160 - 200 °C, where the oxygen-containing functional groups in the graphene oxide undergo cleavage, and the escape of gas causes a rapid decrease in the sample mass. Moreover, since the pressure generated by the gas is greater than the van der Waals force between the graphene oxide layers, the graphene oxide will instantaneously expand, and even cause the sample and ash to splash, further exacerbating the mass reduction. However, the mass loss of the enhancer of the present invention in the two stages during the heating process is significantly different: the first stage is around 100 °C - 150 °C, and the mass loss in this stage is mainly due to the desorption of adsorbed water on the surface of nano-titanium dioxide and the volatilization of some physically adsorbed substances; the second stage is around 150 °C - 300 °C, where some chemical bonds in the nano-titanium dioxide begin to break, accompanied by crystal form transformation and structural reorganization. At higher temperatures, anatase nano-titanium dioxide gradually transforms into rutile type, and there is a certain mass loss during this process because the crystal form transformation will lead to the adjustment of the crystal structure and the rearrangement of chemical bonds, and at the same time, a small amount of gas may escape. It is proved that the mass loss of the enhancer of the present invention is significantly reduced, showing more stable performance.

[0043] Practical Application 1

[0044] The enhancer of the present invention is applied to polyurethane concrete coatings, and the carbonation resistance is tested through an accelerated test in a carbonation chamber. The results are shown in Table 1.

[0045] Table 1 Carbonation depth of concrete of existing polyurethane coatings and polyurethane composite coatings after adding the enhancer of the present invention

[0046]

[0047] It can be seen from Table 1 that the carbonation resistance of the polyurethane composite coating added with the enhancer is significantly improved. After 7 days of accelerated test in the carbonation chamber, the carbonation depth is reduced from the existing 26.4 mm to 15.0 mm; when the existing material specimens are completely carbonated after 28 days, the carbonation depth of the specimens added with the enhancer is only 28.6 mm.

[0048] As Figure 3 shown, it is the surface morphology diagram of the polyurethane composite coating after adding the enhancer of the present invention. From Figure 3 the coating microstructure, it can be seen that the surface state of the material is fine and dense after adding the enhancer, which can effectively limit the penetration of corrosive ions.

[0049] Practical Application 2

[0050] The enhancer of the present invention is applied to chlorinated rubber concrete coatings, and the carbonation resistance is tested through an accelerated test in a carbonation chamber. The results are shown in Table 2.

[0051] Table 2 Carbonation depths of existing chlorinated rubber coatings and chlorinated rubber composite coatings with the enhancer of the present invention in concrete

[0052]

[0053] As can be seen from Table 2, the carbonation resistance of the chlorinated rubber composite coating with the enhancer added has also been significantly improved. After 7 days of accelerated test in the carbonation chamber, the carbonation depth has decreased from the existing 21.3 mm to 14.1 mm; when the existing specimens are completely carbonated after 14 days, the carbonation depth of the specimens with the enhancer added is only 26.1 mm.

[0054] As Figure 4 shown, it is the surface morphology diagram of the chlorinated rubber composite coating with the enhancer of the present invention added. From Figure 4 the microscopic structure of the coating, it can be seen that after the enhancer is added, the surface state of the material is smooth and dense, which can effectively limit the penetration of corrosive ions.

[0055] Practical Application 3

[0056] The enhancer of the present invention is applied to epoxy resin concrete coatings, and the carbonation resistance is tested through an accelerated test in a carbonation chamber. The results are shown in Table 3.

[0057] Table 3 Carbonation depths of existing epoxy resin coatings and epoxy resin composite coatings with the enhancer of the present invention in concrete

[0058]

[0059] As can be seen from Table 3, the carbonation resistance of the epoxy resin composite coating with the enhancer added has also been significantly improved. After 7 days of accelerated test in the carbonation chamber, the carbonation depth has decreased from the existing 28.7 mm to 21.8 mm; when the existing specimens are completely carbonated after 14 days, the carbonation depth of the specimens with the enhancer added is only 22.4 mm.

[0060] As Figure 5 shown, it is the surface morphology diagram of the epoxy resin composite coating with the enhancer of the present invention added. From Figure 5 the microscopic structure of the coating, it can be seen that after the enhancer is added, the surface state of the material is smooth and dense, with no obvious holes, which can effectively limit the penetration of corrosive ions.

[0061] The present invention takes improving the compactness of the microstructure of the concrete coating as a technical means, nano-modifies the conventional concrete coating to obtain a nano-hybrid multi-functional interface enhancer, while improving the microscopic porosity and density of the concrete coating, enhancing the impermeability of the concrete coating and improving its durability.

Claims

1. An enhancer, characterized in that: It includes graphene oxide, nano-titanium dioxide and nano-silica, and the graphene oxide, the nano-titanium dioxide and the nano-silica are all industrial-grade raw materials; the weight portion of the graphene oxide is 98.0 to 140.1 parts, the particle size is 1 to 5 nm, and the specific surface area is ≥2000 m 2 / g; the weight portion of the nano-titanium dioxide is 99.8 to 140.6 parts, the particle size is 10 to 30 nm, and the specific surface area is ≥160 m 2 / g; the weight portion of the nano-silica is 99.5 to 140.4 parts, the particle size is 10 to 50 nm, and the specific surface area is 150 to 300 m 2 / g.

2. A preparation method for the enhancer described in claim 1, characterized in that: The preparation method comprises the following steps: (1) Prepare the precursor titanium dioxide. First, uniformly add nano-titanium dioxide into absolute ethanol, then perform ultrasonic dispersion for 1 - 2 h by an ultrasonic disperser, then carry out constant-temperature water bath stirring at 75 - 80 °C with a stirring speed of 200 - 500 rpm. During stirring, slowly add deionized water at a dropping speed of < 1 g / min. After the dropping is completed, increase the stirring speed to 1000 - 1500 rpm, and then react for 5.5 - 6.5 h to obtain a homogeneous solution. Then, centrifuge the obtained homogeneous solution and wash it with absolute ethanol three times. Then, place the obtained white substance in a vacuum drying oven for constant-temperature drying at a drying temperature of 55 - 65 °C and a drying time of 24 - 30 h to obtain the precursor titanium dioxide; (2) Prepare the precursor graphene oxide - titanium dioxide. First, add the precursor titanium dioxide prepared in step (1) into an N,N-dimethylformamide solution with a solution concentration of 0.4 - 0.6 mg / ml, then perform ultrasonic dispersion for 1 - 2 h by an ultrasonic disperser to obtain a uniform suspension solution. Then, add the pre-dispersed graphene oxide into the suspension solution. Then, heat the suspension solution in an oil bath at 100 - 110 °C while stirring and dispersing for 4.5 - 5.5 h to obtain a solution. Then, centrifuge the obtained solution and wash it with absolute ethanol five times. Then, place the obtained white substance in a vacuum drying oven for constant-temperature drying at a drying temperature of 55 - 65 °C and a drying time of 24 - 30 h to obtain the precursor graphene oxide - titanium dioxide; (3) Prepare the reinforcing agent. Add nano-silica into ethyl acetate and perform ultrasonic dispersion for 0.5 - 1 h by an ultrasonic disperser to make the nano-silica uniformly dispersed to obtain a solution. Then, add the precursor graphene oxide - titanium dioxide prepared in step (2) into the obtained solution, and then perform ultrasonic dispersion for 24 - 30 h by an ultrasonic disperser to obtain the reinforcing agent.

3. The preparation method of an enhancer according to claim 2, characterized in that: In step (1), the weight ratio of nano-titanium dioxide, absolute ethanol and deionized water is 1:315:

28.

4. The preparation method of an enhancer according to claim 2, wherein: In step (2), the weight ratio of the pre-dispersed graphene oxide to the precursor titanium dioxide is 2:1 - 4:

1.

5. An application of the enhancer according to claim 1 or 2, characterized in that: The said reinforcing agent can be applied to polyurethane or chlorinated rubber or epoxy resin, and the reinforcing agent is added into the resin component of polyurethane or chlorinated rubber or epoxy resin organic coating through a functional material.

6. The application of an enhancer according to claim 5, wherein: The mixing method is as follows: First, add the reinforcing agent into the resin component of polyurethane or chlorinated rubber or epoxy resin organic coating, then stir and disperse at 23 - 27 °C for 0.5 - 1 h with a stirring speed of 200 - 500 rpm to obtain a composite modified resin component; then, mix and stir according to the specified curing agent ratio of different types of coatings respectively. Finally, obtain the modified concrete coating, and form a modified protective coating after coating the modified concrete coating on the concrete surface.

7. The application of an enhancer according to claim 6, wherein: The addition ratio of the said reinforcing agent is 0.1% - 0.5%.

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