Multifunctional acrylic resin grouting material as well as preparation method and application thereof

Abstract

The invention provides a multifunctional acrylic resin grouting material as well as a preparation method and application thereof, and belongs to the technical field of waterproof grouting materials. The multifunctional acrylic resin grouting material comprises a component A and a component B, the volume ratio of the component A to the component B is 1: 1; the component A comprises the following raw materials in parts by mass: 35-45 parts of a first acrylate monomer, 1-5 parts of an initiator and 0-10 parts of a solvent; the component B comprises the following raw materials in parts by weight: 30-40 parts of a second acrylate monomer, 1-5 parts of an accelerator, 1-5 parts of a flame retardant and 0-10 parts of a solvent. The multifunctional acrylic resin grouting material is obtained by mixing the component A and the component B. The multifunctional acrylic resin grouting material has the characteristics of low viscosity and high permeability, can be used for treating tiny cracks, can be quickly cured, has high strength, can resist formation movement, has better chemical corrosion resistance to acid and alkali solvents, and can be used for repairing and reinforcing in a humid environment.

Description

Technical Field

[0001] The invention belongs to the technical field of waterproof grouting materials, and more specifically relates to a multifunctional acrylic resin grouting material and a preparation method and application thereof. Background Art

[0002] There are many methods for tunnel construction. Among them, the shield method has become the mainstream method for urban rail transit construction due to its advantages of small disturbance, good safety and high efficiency. However, with the continuous increase in tunnel operation time, tunnel diseases are increasingly emerging. Among them, water leakage in shield tunnels is the most common and has the greatest impact.

[0003] Existing studies have shown that water leakage in shield tunnels is extremely common and can easily lead to further tunnel diseases, such as segment cracks, segment deformation, uneven settlement, etc., which seriously affect the safety and service life of shield tunnels.

[0004] Grouting is a common method for treating water leakage in shield tunnels. Among the commonly used grouting materials, cement-based grouting materials have high strength, wide material sources, low prices, and simple construction processes. However, cement-based grouting materials have poor stability and are prone to precipitation and water separation. When grouting under conditions of high groundwater flow rates, the slurry is easily washed and diluted by water, and the injectability is poor. In contrast, the application of organic chemical grouting materials has solved many problems encountered by inorganic cement-based grouting materials. The application of chemical slurries has solved the problem of difficult water blocking and reinforcement in tunnel projects to a certain extent. However, the chemical slurries currently used have large particles and high viscosity, and their injectability is poor, making it difficult to grout tiny cracks. Although traditional acrylic materials have good injectability, their sand-solidifying body has low strength, and the strength of the reinforced body after grouting reinforcement is poor. Therefore, it is of great significance to develop a grouting material with good injectability, high strength, and green and pollution-free. Summary of the invention

[0005] The purpose of the present invention is to provide a multifunctional acrylic resin grouting material and a preparation method and application thereof, so as to solve the problems of high viscosity, poor injectability, high toxicity and poor strength of existing grouting materials, and to achieve effective treatment of water leakage in shield tunnels under water-rich environments.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] One of the technical solutions of the present invention is to provide a multifunctional acrylic resin grouting material, wherein the multifunctional acrylic resin grouting material comprises a component A and a component B; the volume ratio of the component A to the component B is 1:1;

[0008] The component A comprises the following raw materials in parts by weight: 35-45 parts of a first acrylate monomer, 1-5 parts of an initiator, and 0-10 parts of a solvent;

[0009] The B component includes the following raw materials in parts by weight: 30-40 parts of the second acrylate monomer, 1-5 parts of the accelerator and 0-10 parts of the solvent;

[0010] The first acrylate monomer and the second acrylate monomer are selected from different acrylate monomers.

[0011] The first acrylate monomer and the second acrylate monomer of the present invention both contain carbon-carbon double bonds. During the reaction, the carbon-carbon double bonds in the main agent are decomposed and polymerized to form a copolymer. The first acrylate monomer and the second acrylate monomer are combined to form a multifunctional acrylic resin grouting material having a large number of wrinkles and grooves of different depths on the surface, and a large number of pore structures are generated, forming an irregular cross-linked network structure (such as Figure 1 The network structure enhances the water absorption and significantly improves the water absorption of the multifunctional acrylic resin grouting material, making it extremely suitable for the effective treatment of shield tunnel leakage in a water-rich environment.

[0012] Preferably, the first acrylate monomer comprises hydroxyethyl acrylate and / or sodium propionate.

[0013] Preferably, the initiator comprises sodium persulfate; the function of the initiator is to decompose and generate free radicals, and the free radicals will attack the carbon-carbon double bonds in the acrylate monomer, thereby promoting the decomposition of the carbon-carbon double bonds.

[0014] Preferably, the second acrylate monomer includes dimethylaminoethyl methacrylate and / or sodium propionate.

[0015] Preferably, the accelerator comprises triethanolamine; the accelerator functions to promote the decomposition of the initiator.

[0016] Preferably, the B component further comprises a flame retardant, the flame retardant comprises tris(2-chloropropyl) phosphate, and the mass ratio of the flame retardant to the accelerator is 1-5:1-5.

[0017] Preferably, the solvent comprises water.

[0018] The second technical solution of the present invention is to provide a method for preparing the multifunctional acrylic resin grouting material, comprising the following steps:

[0019] According to the ratio of each raw material of the A component, the raw materials of the A component are mixed to obtain the A component; according to the ratio of each raw material of the B component, the raw materials of the B component are mixed to obtain the B component; when in use, the A component and the B component are mixed according to the ratio to obtain the multifunctional acrylic resin grouting material.

[0020] Preferably, the components A and B are used within 24 hours after preparation.

[0021] More preferably, the mixing of the component A and the component B is carried out in a two-component injection pump of an in-line static mixer; the length of the static mixer is ≥50 cm to ensure uniform mixing.

[0022] More preferably, the mixing time is determined according to specific circumstances to ensure uniform mixing.

[0023] The third technical solution of the present invention is to provide the application of the multifunctional acrylic resin grouting material in the treatment of water leakage in shield tunnels in a water-rich environment.

[0024] The present invention discloses the following technical effects:

[0025] 1. The multifunctional acrylic resin grouting material of the present invention is non-toxic and harmless after curing, and belongs to a new type of green environmentally friendly grouting material. According to the Chinese building materials industry standard JC1066-2008, the heavy metal content and volatile organic matter of the acrylic slurry are tested, wherein the volatile organic compound content is 36.3g / L, which is much lower than the industry standard of 80g / L. The soluble heavy metal content of Pb, Cd, Cr, and Hg is 0mg / kg, which is free of heavy metals and much lower than the industry standard.

[0026] 2. The multifunctional acrylic resin grouting material of the present invention has a large number of wrinkles and grooves of different depths on its surface, and generates many pore structures, forming an irregular surface cross-linking structure (such as Figure 1 As shown). This structure has a strong absorption effect on water. When water enters the lipid network, the movement of water molecules is restricted due to the elastic constraints of the network, and it is not easy to overflow from the network again. Therefore, the multifunctional acrylic resin grouting material has good water absorption performance and is very suitable for grouting and water blocking in a leaking water environment.

[0027] 3. The multifunctional acrylic resin grouting material of the present invention is a highly reactive multi-component grouting product with the characteristics of low viscosity and high permeability. It can quickly solidify to form a rubber-like resin with high strength to resist stratum movement. The product of the present invention has good chemical corrosion resistance to acid and alkali solvents and can be used for repair and reinforcement in humid environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is the SEM image of the multifunctional acrylic resin grouting material obtained in Example 1. DETAILED DESCRIPTION

[0029] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as limiting the present invention, but should be understood as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0030] It should be understood that the terms described in the present invention are only for describing a particular embodiment and are not intended to limit the present invention. In addition, for the numerical range in the present invention, it should be understood that each intermediate value between the upper and lower limits of the scope is also specifically disclosed. The intermediate value in any stated value or stated range, and each smaller range between any other stated value or intermediate value in the described range is also included in the present invention. The upper and lower limits of these smaller ranges can be independently included or excluded in the scope.

[0031] Unless otherwise indicated, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art. Although the present invention describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials associated with the documents. In the event of a conflict with any incorporated document, the content of this specification shall prevail.

[0032] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments of the present invention description without departing from the scope or spirit of the present invention. Other embodiments derived from the present invention description will be apparent to those skilled in the art. The present invention description and examples are exemplary only.

[0033] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0034] In the following examples and comparative examples, the parts are by mass.

[0035] Example 1

[0036] This embodiment provides a multifunctional acrylic resin grouting material, which is as follows:

[0037] Preparation of component A: Mix 45 parts of hydroxyethyl acrylate and 5 parts of sodium persulfate, stir evenly and set aside.

[0038] Preparation of component B: Mix 40 parts of dimethylaminoethyl methacrylate, 5 parts of triethanolamine and 5 parts of tris(2-chloropropyl) phosphate, stir evenly and set aside.

[0039] Add component A and component B in a volume ratio of 1:1 into a two-component injection pump of an in-line static mixer (the length of the static mixer is ≥ 50 cm) to mix to obtain a multifunctional acrylic resin grouting material, which is then injected into the area to be reinforced.

[0040] Example 2

[0041] This embodiment provides a multifunctional acrylic resin grouting material, which is as follows:

[0042] Preparation of component A: Mix 35 parts of hydroxyethyl acrylate, 5 parts of sodium persulfate and 10 parts of pure water, stir well and set aside.

[0043] Preparation of component B: Mix 40 parts of dimethylaminoethyl methacrylate, 5 parts of triethanolamine and 5 parts of tris(2-chloropropyl) phosphate, stir evenly and set aside.

[0044] Add component A and component B in a volume ratio of 1:1 into a two-component injection pump of an in-line static mixer (the length of the static mixer is ≥ 50 cm) to mix to obtain a multifunctional acrylic resin grouting material, which is then injected into the area to be reinforced.

[0045] Example 3

[0046] This embodiment provides a multifunctional acrylic resin grouting material, which is as follows:

[0047] Preparation of component A: Mix 45 parts of hydroxyethyl acrylate, 1 part of sodium persulfate and 4 parts of pure water, stir well and set aside.

[0048] Preparation of component B: Mix 40 parts of dimethylaminoethyl methacrylate, 5 parts of triethanolamine and 5 parts of tris(2-chloropropyl) phosphate, stir evenly and set aside.

[0049] Add component A and component B in a volume ratio of 1:1 into a two-component injection pump of an in-line static mixer (the length of the static mixer is ≥ 50 cm) to mix to obtain a multifunctional acrylic resin grouting material, which is then injected into the area to be reinforced.

[0050] Example 4

[0051] This embodiment provides a multifunctional acrylic resin grouting material, which is as follows:

[0052] Preparation of component A: Mix 45 parts of hydroxyethyl acrylate and 5 parts of sodium persulfate, stir evenly and set aside.

[0053] Preparation of component B: Mix 30 parts of dimethylaminoethyl methacrylate, 5 parts of triethanolamine, 5 parts of tris(2-chloropropyl) phosphate and 10 parts of pure water, stir well and set aside.

[0054] Add component A and component B in a volume ratio of 1:1 into a two-component injection pump of an in-line static mixer (the length of the static mixer is ≥ 50 cm) to mix to obtain a multifunctional acrylic resin grouting material, which is then injected into the area to be reinforced.

[0055] Example 5

[0056] This embodiment provides a multifunctional acrylic resin grouting material, which is as follows:

[0057] Preparation of component A: Mix 45 parts of hydroxyethyl acrylate and 5 parts of sodium persulfate, stir evenly and set aside.

[0058] Preparation of component B: Mix 40 parts of dimethylaminoethyl methacrylate, 1 part of triethanolamine, 5 parts of tris(2-chloropropyl) phosphate and 4 parts of pure water, stir well and set aside.

[0059] Add component A and component B in a volume ratio of 1:1 into a two-component injection pump of an in-line static mixer (the length of the static mixer is ≥ 50 cm) to mix to obtain a multifunctional acrylic resin grouting material, which is then injected into the area to be reinforced.

[0060] Example 6

[0061] This embodiment provides a multifunctional acrylic resin grouting material, which is as follows:

[0062] Preparation of component A: Mix 45 parts of hydroxyethyl acrylate and 5 parts of sodium persulfate, stir evenly and set aside.

[0063] Preparation of component B: Mix 40 parts of dimethylaminoethyl methacrylate, 5 parts of triethanolamine, 1 part of tris(2-chloropropyl) phosphate and 4 parts of pure water, stir evenly and set aside.

[0064] Add component A and component B in a volume ratio of 1:1 into a two-component injection pump of an in-line static mixer (the length of the static mixer is ≥ 50 cm) to mix to obtain a multifunctional acrylic resin grouting material, which is then injected into the area to be reinforced.

[0065] Example 7

[0066] The difference from Example 1 is that the addition of tris(2-chloropropyl) phosphate is omitted; the rest is the same as Example 1.

[0067] Comparative Example 1

[0068] The difference from Example 1 is that the addition of sodium persulfate is omitted; the rest is the same as Example 1.

[0069] Comparative Example 2

[0070] The difference from Example 1 is that the addition of triethanolamine is omitted; the rest is the same as Example 1.

[0071] Comparative Example 3

[0072] The difference from Example 1 is that dimethylaminoethyl methacrylate in component B is replaced by hydroxyethyl acrylate; the rest is the same as Example 1.

[0073] In this comparative example, the components do not react with each other, and the multifunctional acrylic resin grouting material cannot be synthesized, and subsequent performance testing cannot be performed.

[0074] Comparative Example 4

[0075] The difference from Example 1 is that the hydroxyethyl acrylate in component A is replaced by dimethylaminoethyl methacrylate; the rest is the same as Example 1.

[0076] In this comparative example, the components do not react with each other, and the multifunctional acrylic resin grouting material cannot be synthesized, and subsequent performance testing cannot be performed.

[0077] It can be seen from Examples 1 to 7 and Comparative Examples 3 to 4 that the present invention obtains a sponge-like multifunctional acrylic resin grouting material rich in a multi-level pore structure by synergistic polymerization of different types of acrylate monomers and other additives. The grouting material has a strong absorption effect on water and is extremely suitable for grouting and water blocking in a leaking water environment.

[0078] Effect verification:

[0079] 1. The curing time, water absorption expansion rate and initial viscosity of the acrylic resin grouting materials prepared in each embodiment and comparative example were tested. The test standard was in accordance with JC / T 2037-2010 "Acrylate Grouting Materials", and the compressive strength of the sand-solidified body was tested with reference to ASTM D4219-08 "Unconfined Compressive Strength Index of Chemical Grouting Soil". Each acrylic resin grouting material specimen was immersed in 10wt% sodium hydroxide solution and 1wt% hydrochloric acid solution for 72h, and the surface of each specimen was taken out to observe whether there was powdering or cracking. The test results are shown in Table 1.

[0080] Table 1 Performance indicators of acrylic resin grouting materials

[0081]

[0082]

[0083] As shown in Table 1, the addition of the first acrylate monomer, the second acrylate monomer, the initiator and the accelerator all reduce the gel time, among which the accelerator has the greatest effect on the gel time, while the content of the flame retardant has no significant effect on the gel time of the material; the addition of the first acrylate monomer, the second acrylate monomer and the initiator is conducive to the water absorption and expansion of the material, and the content of the accelerator and the flame retardant has little effect on the water absorption and expansion performance of the material; the addition of the first acrylate monomer, the second acrylate monomer, the initiator and the accelerator all increase the compressive strength of the sand-fixing body, among which the accelerator has the greatest effect on the compressive strength of the sand-fixing body, while the flame retardant has no significant effect on the compressive strength; the initial viscosity of the multifunctional acrylic resin grouting material obtained by the present invention is only about 5mPa·s, with good fluidity and strong injectability. In addition, the obtained multifunctional acrylic resin grouting material has good acid and alkali resistance.

[0084] 2. The effects of the acrylic resin grouting materials prepared in the embodiments and comparative examples on grouting treatment of micro cracks were tested. The test methods and results are as follows:

[0085] The grouting materials obtained in each embodiment and comparative example were subjected to a variable head permeability test using a TST-55 permeameter. The test standard was based on the variable head permeability test in GB / T 50123-2019 "Standard for Geotechnical Test Methods". The test results are shown in Table 2.

[0086] Table 2 Variable head permeability test results of grouting materials obtained in various embodiments and comparative examples

[0087]

[0088]

[0089] As shown in Table 2, the permeability coefficient of acrylic resin grouting material decreases with the increase of the content of the first acrylate monomer, the second acrylate monomer and the initiator, among which the second acrylate monomer content has the greatest influence. The permeability coefficient is basically unrelated to the content of the accelerator and the flame retardant.

[0090] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0091] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multifunctional acrylic resin grouting material, characterized in that: The multifunctional acrylic resin grouting material comprises component A and component B; the volume ratio of component A to component B is 1:1; The component A comprises the following raw materials in parts by weight: 35-45 parts of a first acrylate monomer, 1-5 parts of an initiator, and 0-10 parts of a solvent; The B component includes the following raw materials in parts by weight: 30-40 parts of the second acrylate monomer, 1-5 parts of the accelerator and 0-10 parts of the solvent; The first acrylate monomer and the second acrylate monomer are selected from different acrylate monomers.

2. The multifunctional acrylic resin grouting material according to claim 1, characterized in that: The first acrylate monomer includes hydroxyethyl acrylate and / or sodium propionate.

3. The multifunctional acrylic resin grouting material according to claim 1, characterized in that: The initiator includes sodium persulfate.

4. The multifunctional acrylic resin grouting material according to claim 1, characterized in that: The second acrylate monomer includes dimethylaminoethyl methacrylate and / or sodium propionate.

5. The multifunctional acrylic resin grouting material according to claim 1, characterized in that: The accelerator includes triethanolamine.

6. The multifunctional acrylic resin grouting material according to claim 1, characterized in that: The B component also includes a flame retardant, which includes tris(2-chloropropyl) phosphate, and the mass ratio of the flame retardant to the accelerator is 1-5:1-5.

7. The multifunctional acrylic resin grouting material according to claim 1, characterized in that: The solvent includes water.

8. The method for preparing the multifunctional acrylic resin grouting material according to any one of claims 1 to 7, characterized in that: The steps include: According to the ratio of each raw material of the A component, the raw materials of the A component are mixed to obtain the A component; according to the ratio of each raw material of the B component, the raw materials of the B component are mixed to obtain the B component; When in use, the component A and the component B are mixed according to the ratio to obtain the multifunctional acrylic resin grouting material.

9. The method for preparing the multifunctional acrylic resin grouting material according to claim 8, characterized in that: The components A and B should be used within 24 hours after preparation.

10. Use of the multifunctional acrylic resin grouting material according to any one of claims 1 to 7 in the treatment of water leakage in a shield tunnel in a water-rich environment.

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