Nanometer microsphere type silane coupling agent as well as preparation method and application thereof

Abstract

The invention provides a nano-microsphere type silane coupling agent as well as a preparation method and application thereof. The preparation method comprises the following steps: S1, dissolving an anionic surfactant and a nonionic surfactant in water, continuously stirring, and heating to 65-85 DEG C for later use; and S2, uniformly mixing an aromatic hydrocarbon monomer, an ester monomer and a silane coupling agent monomer, dropwise adding the mixture into the mixture obtained in the S1, introducing protective gas for 10-15 minutes, heating to 65-85 DEG C, adding a half amount of the initiator, reacting for 60 minutes, supplementing the residual initiator, and continuously reacting for 4-6 hours to obtain the nano-microsphere type silane coupling agent. Monomers with different rigidity and water solubility are introduced into a polymer through a specific emulsion polymerization reaction, silane coupling agent groups which are easy to hydrolyze in the coupling agent are protected by two layers, and the obtained nano-microsphere type silane coupling agent can be stably and uniformly stored in an aqueous solution and gradually hydrolyzes to form the silane coupling agent in a core after being dispersed in concrete; the continuous and stable reinforcing effect is achieved, and the concrete performance is improved.

Description

Technical Field

[0001] The invention relates to the technical field of silane coupling agents and concrete, and in particular to a nano-microsphere type silane coupling agent and a preparation method and application thereof. Background Art

[0002] After the silane group in the molecular structure of the silane coupling agent is hydrolyzed into silanol, it can react chemically with the surface of cement particles, thereby enhancing the internal interfacial forces and improving the mechanical properties of concrete. However, conventional silane coupling agents, such as 3-(methacryloyloxy)propyltrimethoxysilane and 3-(methacryloyloxy)propyltriethoxysilane, will form stratification in water, and will gradually condense to form precipitation, and cannot be stored stably. In addition, when directly applied to concrete, the unhydrolyzed silane coupling agent tends to float on the surface of the concrete, resulting in uneven concrete mixture and unstable performance.

[0003] Chinese patent CN101982477A "A styrene-acrylic emulsion for simultaneously modifying two silane coupling agents and its preparation method" discloses a method for simultaneously modifying two silane coupling agents by styrene-acrylic emulsion, using styrene, butyl acrylate, methyl methacrylate, and acrylic acid as polymerization monomers, and functional monomers containing silicone as modification monomers to prepare a styrene-acrylic emulsion with extremely low water absorption. However, its molecular structure requires silane groups to be distributed in the shell layer of the core-shell structure to reduce the water absorption performance of the emulsion. It is suitable for base materials of organic coatings and is not suitable for the field of cement concrete. The silane groups are exposed to the outside and will gradually hydrolyze after contacting water. After being added to concrete, when the silane coupling agent structure of the shell layer contacts the strong alkaline environment of concrete, it will begin to rapidly hydrolyze and agglomerate before being evenly dispersed in the concrete system, forming a heterogeneous structure in the concrete system, and failing to achieve the effect of dispersion and performance improvement.

[0004] Therefore, there is an urgent need to develop a type of silane coupling agent that can exist stably in water and disperse evenly in concrete. Summary of the invention

[0005] In view of the problems that the existing methods for modifying silane coupling agents have poor dispersibility and stability in water, cannot be evenly dispersed in concrete, are not suitable for the development process of hydration reaction of adhesive materials such as concrete cement, and the working performance still needs to be further improved, the present invention provides a nano-microsphere silane coupling agent and a preparation method and application thereof. Through a specific emulsion polymerization reaction, monomers with different rigidity and water solubility are introduced into a polymer, and the easily hydrolyzed silane coupling agent group in the coupling agent is protected by two layers and can be stably and evenly stored in an aqueous solution. After being added to a concrete system in a high-alkali and high-salt environment, the outer layer slowly hydrolyzes, and under the action of osmotic pressure, the core-shell structure of the nano-microsphere silane coupling agent is destroyed, and the silane coupling agent in the core is gradually hydrolyzed, and chemical bonding occurs with the material inside the concrete, playing a sustained and stable reinforcing role, improving the performance of the concrete, and having broad application prospects.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A method for preparing a nano-microsphere silane coupling agent comprises the following steps:

[0008] S1. Dissolve the anionic surfactant and the nonionic surfactant in water, continue stirring, and heat to 65-85 ° C for use;

[0009] S2. The aromatic hydrocarbon monomer, ester monomer and silane coupling agent monomer are uniformly mixed, and added dropwise to the mixture obtained in S1, a protective gas is introduced for 10-15 minutes, the temperature is raised to 65-85°C, half of the initiator is added, the reaction is carried out for 60 minutes, the remaining initiator is added, and the reaction is continued for 4-6 hours to obtain the nano-microsphere silane coupling agent.

[0010] The present invention utilizes the core-shell microcapsule principle, uses lipophilic styrene and silane coupling agent as the core, and hydrophilic acrylic ester group as the shell to obtain a core-shell structure. The easily hydrolyzed silane coupling agent is wrapped in the middle of the capsule, and the shell is hydrolyzed and released in the middle of the cement particles under the alkaline conditions of cement. Although similar preparation techniques have been reported, their purposes and molecular structure designs are completely different from those of the present invention. The material obtained by the method of simultaneously modifying two silane coupling agents with styrene-acrylic emulsion is a styrene-acrylic emulsion, and its silane group is exposed to the outside, and will gradually hydrolyze after contacting water. After being added to concrete, it will begin to rapidly hydrolyze and agglomerate before being evenly dispersed in the concrete system, forming a heterogeneous structure in the concrete system, and the effect of dispersion and performance improvement cannot be achieved.

[0011] Furthermore, the anionic surfactant described in S1 is one or more of sodium dodecyl sulfonate, sodium dodecyl sulfate, and sodium dodecylbenzene sulfonate; the nonionic surfactant described in S1 is dodecylphenol polyoxyethylene ether and / or dodecylamine polyoxyethylene ether.

[0012] Furthermore, the metal salt described in S1 includes one or more of nitrate, acetate, and chloride.

[0013] Furthermore, the stirring speed of S1 is 300-1000 rpm.

[0014] Furthermore, the mass ratio of the anionic surfactant to the nonionic surfactant in S1 is (1.1-2.5):(0.5-1.5).

[0015] Furthermore, the aromatic hydrocarbon monomer described in S2 is one or more of styrene, α-methylstyrene and 4-methylstyrene; the ester monomer described in S2 is one or more of tert-butyl acrylate, tert-butyl methacrylate, butyl acrylate and butyl methacrylate; the initiator described in S2 is one or more of potassium persulfate, ammonium persulfate and benzoyl peroxide.

[0016] Furthermore, the silane coupling agent monomer described in S2 is one or more of 3-(methacryloyloxy)propyltrimethoxysilane, 3-(methacryloyloxy)propyltriethoxysilane, allyltrimethoxysilane and allyltriethoxysilane.

[0017] Furthermore, the mass ratio of the aromatic hydrocarbon monomer, ester monomer, silane coupling agent monomer and initiator in S2 is (24-48):(30.8-61.5):(9.9-24.8):(0.5-2.5).

[0018] Another object of the present invention is to provide a nano-microsphere silane coupling agent.

[0019] A nano-microsphere silane coupling agent is prepared according to any of the above-mentioned methods for preparing a nano-microsphere silane coupling agent.

[0020] Another object of the present invention is to provide an application of a nano-microsphere silane coupling agent.

[0021] An application of the aforementioned nano-microsphere silane coupling agent in preparing concrete.

[0022] Furthermore, when preparing concrete, the amount of nano-microsphere silane coupling agent added is 0.2-0.8% of the mass ratio of the adhesive.

[0023] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0024] The nano-microsphere silane coupling agent provided by the present invention is prepared by a specific emulsion polymerization method of aromatic hydrocarbon monomers, ester monomers and silane coupling agent monomers. During the preparation process, the silane coupling agent is dissolved in other hydrophobic monomers in advance, thereby avoiding contact and reaction between the silane coupling agent and water, ensuring the protective effect of the silane coupling agent, and introducing monomers with different rigidity and water solubility into the polymer. The ester chain segments with relatively strong hydrophilicity in the system are distributed on the surface of the nano-microspheres, while the aromatic hydrocarbon chain segments with relatively large rigidity are distributed in the middle to form a "hard" and "dense" middle layer. The silane coupling agent chain segments with poor hydrophilicity and chain flexibility are distributed in the innermost layer. The silane coupling agent groups that are easily hydrolyzed in the coupling agent are protected by two layers and can be stably and evenly stored in an aqueous solution. After the obtained nano-microsphere silane coupling agent is added to a concrete system in a high-alkali and high-salt environment, under the action of osmotic pressure, the core-shell structure of the nano-microsphere silane coupling agent is destroyed, the outer ester chain segment slowly hydrolyzes, and gradually releases the silane coupling agent in the core. In the concrete system, the silanol group is hydrolyzed and chemically bonds with the material inside the concrete, and cross-links with the material inside the concrete, thereby enhancing the interaction force between the internal interfaces of the materials, exerting a sustained and stable reinforcement effect, and improving the performance of the concrete. The silanol group has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The invention is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the invention. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0026] Figure 1 This is a TEM image of the nano-microsphere silane coupling agent of Example 1 of the present application.

[0027] Figure 2 This is a TEM image of the nano-microsphere silane coupling agent of Example 3 of the present application.

[0028] Figure 3 This is the EDS image of the nano-microsphere silane coupling agent in Example 1 of the present application. DETAILED DESCRIPTION

[0029] In order to better illustrate the purpose, technical scheme and advantages of the present invention, the present invention is further described by the following examples. Obviously, the following examples are only part of the embodiments of the present invention, rather than all the embodiments; it should be understood that the embodiments of the present invention are only used to illustrate the technical effects of the present invention, rather than to limit the scope of protection of the present invention.

[0030] The raw materials in the examples can all be obtained commercially; unless otherwise specified, the reagents, methods and equipment used in the present invention are conventional reagents, methods and equipment in the art.

[0031] Example 1

[0032] A method for preparing a nano-microsphere silane coupling agent comprises the following steps:

[0033] S1. 1.1g sodium dodecyl sulfate and 1.5g dodecylphenol polyoxyethylene ether were placed in a reaction flask and dissolved in 932.1g water, the stirring speed was set to 400rpm, the temperature was raised to 75°C, and set aside;

[0034] S2. Weigh 24.0 g of styrene, 30.8 g of tert-butyl acrylate and 9.9 g of 3-(methacryloyloxy)propyltrimethoxysilane in turn, stir evenly with a magnetic stirrer, add dropwise to the mixture obtained in S1, pass nitrogen into the reaction flask for 10-15 min, raise the temperature to 75°C, add 0.25 g of potassium persulfate, react for 60 min, add 0.25 g of potassium persulfate, and continue the reaction for 4 h to obtain the nano-microsphere silane coupling agent.

[0035] Example 2

[0036] A method for preparing a nano-microsphere silane coupling agent comprises the following steps:

[0037] S1. 2.5 g sodium lauryl sulfate and 0.5 g polyoxyethylene laurylamine were placed in a reaction flask and dissolved in 932.1 g of water. The stirring speed was set to 300 rpm and the temperature was raised to 65 ° C and set aside.

[0038] S2. Weigh 32.0 g of α-methylstyrene, 61.5 g of tert-butyl methacrylate and 24.8 g of 3-(methacryloyloxy)propyltriethoxysilane in turn, stir evenly with a magnetic stirrer, add dropwise to the mixture obtained in S1, pass nitrogen into the reaction flask for 10-15 min, heat to 65°C, add 0.75 g of ammonium persulfate, react for 60 min, add 0.75 g of ammonium persulfate, continue to react for 5 h, and obtain the nano-microsphere silane coupling agent.

[0039] Example 3

[0040] A method for preparing a nano-microsphere silane coupling agent comprises the following steps:

[0041] S1. 2.0 g of sodium dodecylbenzene sulfonate and 0.9 g of dodecylphenol polyoxyethylene ether were placed in a reaction flask and dissolved in 891.6 g of water. The stirring speed was set to 600 rpm and the temperature was raised to 85 ° C and set aside.

[0042] S2. Weigh 18.0 g of 4-methylstyrene, 40 g of butyl acrylate and 15.0 g of allyltrimethoxysilane in turn, stir evenly with a magnetic stirrer, and add dropwise to the mixture obtained in S1. Pass nitrogen into the reaction flask for 10-15 min, raise the temperature to 85°C, add 1.25 g of benzoyl peroxide, react for 60 min, add 1.25 g of benzoyl peroxide, and continue to react for 6 h to obtain the nano-microsphere silane coupling agent.

[0043] Example 4

[0044] A method for preparing a nano-microsphere silane coupling agent comprises the following steps:

[0045] S1. 1.1g sodium dodecyl sulfate and 1.5g dodecylphenol polyoxyethylene ether were placed in a reaction flask and dissolved in 895.5g water, the stirring speed was set to 1000rpm, the temperature was raised to 75 ° C, and set aside;

[0046] S2. Weigh 32.0 g of styrene, 50.0 g of butyl methacrylate and 20.0 g of allyltriethoxysilane in turn, stir evenly with a magnetic stirrer, add dropwise to the mixture obtained in S1, pass nitrogen into the reaction flask for 10-15 min, heat to 75°C, add 0.25 g of potassium persulfate, react for 60 min, add 0.25 g of potassium persulfate, and continue to react for 4 h to obtain the nano-microsphere silane coupling agent.

[0047] Example 5

[0048] A method for preparing a nano-microsphere silane coupling agent comprises the following steps:

[0049] S1. 2.1g sodium dodecyl sulfate and 0.9g dodecylphenol polyoxyethylene ether were placed in a reaction flask and dissolved in 881.3g water, the stirring speed was set to 400rpm, the temperature was raised to 75°C, and set aside;

[0050] S2. Weigh 48.0 g of styrene, 51.3 g of butyl acrylate and 15.0 g of 3-(methacryloyloxy)propyltrimethoxysilane in turn, stir evenly with a magnetic stirrer, add dropwise to the mixture obtained in S1, pass nitrogen into the reaction flask for 10-15 min, raise the temperature to 75°C, add 0.7 g of potassium persulfate, react for 60 min, add 0.7 g of potassium persulfate, and continue the reaction for 4 h to obtain the nano-microsphere silane coupling agent.

[0051] Comparative Example 1

[0052] A method for preparing a silane coupling agent comprises the following steps:

[0053] S1. 2.1g sodium dodecyl sulfate and 0.9g dodecylphenol polyoxyethylene ether were placed in a reaction flask and dissolved in 896.3g water, the stirring speed was set to 400rpm, the temperature was raised to 75°C, and set aside;

[0054] S2. Weigh 48.0g of styrene and 51.3g of butyl acrylate successively, stir evenly with a magnetic stirrer, and add dropwise to the mixture obtained in S1. Pass nitrogen into the reaction flask for 10-15min, raise the temperature to 75°C, add 0.7g of potassium persulfate, react for 60min, add 0.7g of potassium persulfate, and continue the reaction for 4h to obtain the silane coupling agent.

[0055] Compared with Example 5, the main difference of this comparative example is that no silane coupling agent monomer is added.

[0056] Comparative Example 2

[0057] A method for preparing a silane coupling agent comprises the following steps:

[0058] S1. 2.1g sodium dodecyl sulfate and 0.9g dodecylphenol polyoxyethylene ether were placed in a reaction flask and dissolved in 932.6g of water. The stirring speed was set to 400rpm and the temperature was raised to 75°C for standby use.

[0059] S2. Weigh 48.0 g of styrene and 15.0 g of 3-(methacryloyloxy)propyltrimethoxysilane, stir evenly with a magnetic stirrer, and add dropwise to the mixture obtained in S1. Pass nitrogen into the reaction flask for 10-15 minutes, raise the temperature to 75°C, add 0.7 g of potassium persulfate, react for 60 minutes, add 0.7 g of potassium persulfate, and continue to react for 4 hours to obtain the silane coupling agent.

[0060] Compared with Example 5, the main difference of this comparative example is that no ester monomer is added.

[0061] Comparative Example 3

[0062] A method for preparing a silane coupling agent comprises the following steps:

[0063] S1. 2.1g sodium dodecyl sulfate and 0.9g dodecylphenol polyoxyethylene ether were placed in a reaction flask and dissolved in 929.3g water, the stirring speed was set to 400rpm, the temperature was raised to 75°C, and set aside;

[0064] S2. Weigh 51.3 g of butyl acrylate and 15.0 g of 3-(methacryloyloxy)propyltrimethoxysilane, stir evenly with a magnetic stirrer, and add dropwise to the mixture obtained in S1. Pass nitrogen into the reaction flask for 10-15 minutes, raise the temperature to 75°C, add 0.7 g of potassium persulfate, react for 60 minutes, add 0.7 g of potassium persulfate, and continue to react for 4 hours to obtain the silane coupling agent.

[0065] Compared with Example 5, the main difference of this comparative example is that no aromatic hydrocarbon monomer is added.

[0066] Comparative Example 4

[0067] Commercially available 3-(methacryloyloxy)propyltrimethoxysilane was used.

[0068] The characterization test of Example 1 was carried out, and the TEM-EDS (transmission electron microscope-element analysis) results are as follows: Figure 1 , Figure 2 , Figure 3 As shown in the figure, it can be seen that the nano-microsphere silane coupling agent obtained in the present application belongs to a nano-microsphere structure with a particle size of 100-200nm. The transmission electron microscope penetrates the microsphere shell and measures that the microsphere contains Si elements unique to the coupling agent, indicating that the silane coupling agent group is wrapped inside the microsphere.

[0069] The test results of the other embodiments are basically consistent with it.

[0070] The above samples were subjected to performance tests, and the experimental test methods were as follows:

[0071] The silane coupling agent is prepared into a 5% solution for use. Considering that the prepared silane coupling agent will be stored for a period of time in the actual production process, the interval between the use and preparation time is marked, such as: if it is used immediately after preparation, it is marked as 0d-5% SCA, and if it is used 12h, 24h, 7d and 28d after preparation, it is marked as 12h-5% SCA, 24h-5% SCA, 7d-5% SCA and 28d-5% SCA, and its uniformity and stability are visually inspected.

[0072] The test results of Examples 1-5 and Comparative Examples 1-4 are shown in the following table:

[0073] Table 1 Coupling agent states and their stability in water in Examples 1-5 and Comparative Examples 1-4

[0074]

[0075] It can be found from Table 1 that the coupling agents of Examples 1-5 and Comparative Example 1 are stable and uniform emulsions in the time interval of 0-28d. In Comparative Example 2, because the surface layer of the coupling agent molecules lacks relatively hydrophilic ester monomers, it is difficult to disperse in the aqueous solution and is an uneven liquid with oily substances on the upper layer. In Comparative Example 3, 0d-5% SCA is a stable and uniform emulsion; but at 12h, there is a trace amount of precipitation in the middle and bottom of the coupling agent liquid, and the precipitation increases with the storage time. The reason is that the coupling agent does not have the isolation and protection of the styrene group, and water slowly contacts the coupling agent and undergoes hydrolysis and condensation reactions. In Comparative Example 4, the 3-(methacryloyloxy)propyltrimethoxysilane coupling agent of the traditional structure, because it does not have the nano-microsphere structure of the present invention, is prepared into a 5% solution, and immediately delaminates, becoming an uneven liquid with an oily substance on the upper layer; as the contact time with water gradually lengthens, at 12 hours, the oily substance on the upper layer becomes less, and there is a small amount of precipitation in the middle and bottom of the liquid; but after the storage time is extended to 24 hours, the coupling agent is completely hydrolyzed and condensed, the oily substance on the upper layer disappears, and becomes precipitation in the middle and bottom of the liquid. Therefore, compared with the silane coupling agent of the traditional structure, the nano-microsphere silane coupling agent structure designed by the present invention can make the silane coupling agent uniformly dispersed in water, and the shell of the microsphere can separate the silane coupling agent in the inner core from water, and finally make the silane coupling agent be stored in water for a long time.

[0076] The mix ratio of C40 concrete test is m(cement): m(mineral powder): m(fly ash): m(sand): m(stone): m(water): m(admixture) = 240:90:80:780:1040:165:8.2, and the silane coupling agent is 0.5% of the mass ratio of the adhesive. Compressive strength test: Test according to the "Standard for Test Methods of Mechanical Properties of Ordinary Concrete" GB / T 50081, and record the compressive strength.

[0077] The test results of Examples 1-5 and Comparative Examples 1-4 are shown in the following table:

[0078] Table 2 28d compressive strength test results of Examples 1-5 and Comparative Examples 1-4 (Unit: MPa)

[0079]

[0080]

[0081] It can be seen from Table 2 that the nano-microsphere silane coupling agents obtained in the present invention have excellent working performance.

[0082] The nano-microsphere silane coupling agent of Examples 1-5 is uniformly dispersed in the concrete system and slowly released. The silane coupling agent hydrolyzes to produce silanol groups, which bond with the inorganic components of the concrete system, and can exert a sustained and stable reinforcement effect to improve the performance of the concrete.

[0083] The 28d compressive strength of the concrete in Comparative Example 1 was 40.1-41.4MPa, with a maximum fluctuation of 1.3MPa. The absolute strength of the concrete was slightly lower than that of the blank group. The reason was that Comparative Example 1 did not include the silane coupling agent monomer with a reinforcing effect, and after the organic phase was mixed into the concrete system, the continuity of the inorganic concrete was damaged to a certain extent. In Comparative Example 2, the 28d compressive strength of the concrete was 37.2 -38.8MPa, with a maximum fluctuation of 1.6MPa. The absolute strength of the concrete is slightly lower than that of the blank group. The reason is that the added emulsion does not contain silane coupling agent with the potential to enhance the performance of concrete, but instead introduces organic components that are incompatible with the inorganic components of concrete; in Comparative Example 3, the storage time of the coupling agent in water is 0h, 12h, 24h, 7d and 28d, respectively. As the storage time of the coupling agent increases, the 28d compressive strength of the concrete first increases to a certain extent and then gradually decreases. The reason is that 0d-5% SCA can be well dispersed in the concrete system and strengthen the internal connection of the concrete system. Starting from 24h-5% SCA, the precipitate hydrolyzed by the coupling agent has lost the function of strengthening the internal connection of the concrete, and has a counter-effect of deteriorating the performance of the concrete. Comparative Example 4 also has the same problem, and Comparative Example 4 has a negative impact on the compressive strength of the concrete after being stored for 12h.

[0084] In summary, the present invention prepares a nano-microsphere silane coupling agent by a specific emulsion polymerization reaction of aromatic hydrocarbon monomers, ester monomers and silane coupling agent monomers, introduces monomers with different rigidity and water solubility into the polymer, wherein the ester chain segments with relatively strong hydrophilicity in the system are distributed on the surface of the nano-microspheres, and the aromatic hydrocarbon chain segments with relatively large rigidity are distributed in the middle, forming a "hard" and "dense" middle layer, and the silane coupling agent chain segments with poor hydrophilicity and chain flexibility are distributed in the innermost layer, and the silane coupling agent groups that are easily hydrolyzed in the coupling agent are protected by two layers, and can be stably and uniformly stored in an aqueous solution. After the obtained nano-microsphere silane coupling agent is added to a concrete system in a high-alkali and high-salt environment, the silane coupling agent in the core is gradually released, and the silanol group is hydrolyzed in the concrete system and chemically bonds with the materials inside the concrete, and cross-links with the materials inside the concrete, enhancing the interaction between the internal interfaces of the materials, exerting a sustained and stable enhancement effect, and improving the performance of the concrete, and has broad application prospects.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A method for preparing a nano-microsphere silane coupling agent, characterized in that: The following steps are involved: S1. Dissolve the anionic surfactant and the nonionic surfactant in water, continue stirring, and heat to 65-85 ° C for use; S2. The aromatic hydrocarbon monomer, ester monomer and silane coupling agent monomer are uniformly mixed, and added dropwise to the mixture obtained in S1, a protective gas is introduced for 10-15 minutes, the temperature is raised to 65-85°C, half of the initiator is added, the reaction is carried out for 60 minutes, the remaining initiator is added, and the reaction is continued for 4-6 hours to obtain the nano-microsphere silane coupling agent.

2. A method for preparing a nano-microsphere silane coupling agent according to claim 1, characterized in that: The anionic surfactant described in S1 is one or more of sodium dodecyl sulfonate, sodium dodecyl sulfate, and sodium dodecylbenzene sulfonate; the nonionic surfactant described in S1 is dodecylphenol polyoxyethylene ether and / or dodecylamine polyoxyethylene ether.

3. A method for preparing a nano-microsphere silane coupling agent according to claim 1, characterized in that: The stirring speed in S1 is 300-1000 rpm.

4. A method for preparing a nano-microsphere silane coupling agent according to claim 1, characterized in that: The mass ratio of the anionic surfactant and the nonionic surfactant in S1 is (1.1-2.5):(0.5-1.5).

5. A method for preparing a nano-microsphere silane coupling agent according to claim 1, characterized in that: The aromatic hydrocarbon monomer described in S2 is one or more of styrene, α-methylstyrene and 4-methylstyrene; the ester monomer described in S2 is one or more of tert-butyl acrylate, tert-butyl methacrylate, butyl acrylate and butyl methacrylate; the initiator described in S2 is one or more of potassium persulfate, ammonium persulfate and benzoyl peroxide.

6. A method for preparing a nano-microsphere silane coupling agent according to claim 1, characterized in that: S2 The silane coupling agent monomer is one or more of 3-(methacryloyloxy)propyltrimethoxysilane, 3-(methacryloyloxy)propyltriethoxysilane, allyltrimethoxysilane and allyltriethoxysilane.

7. A method for preparing a nano-microsphere silane coupling agent according to claim 1, characterized in that: The mass ratio of the aromatic hydrocarbon monomer, ester monomer, silane coupling agent monomer and initiator described in S2 is (24-48):(30.8-61.5):(9.9-24.8):(0.5-2.5).

8. A nano-microsphere silane coupling agent, characterized in that: The nano-microsphere silane coupling agent is prepared according to the preparation method of any one of claims 1 to 7.

9. Use of the nano-microsphere silane coupling agent according to claim 8 in preparing concrete.

10. An application of the nano-microsphere silane coupling agent according to claim 9, characterized in that: When adding the nano-microsphere silane coupling agent to the concrete, the amount of the nano-microsphere silane coupling agent is 0.2-0.8% of the mass ratio of the adhesive material.

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