An environmentally friendly high-strength acrylate grouting material and its preparation method

Abstract

The present invention discloses an environment-friendly high-strength acrylate grouting material and its preparation method, including liquid A and liquid B. The mass ratio of liquid A to liquid B is 1:0.8 - 1.2. Among them, liquid A is composed of the following components in parts by weight: 65 - 121 parts of acrylate main agent, 4 - 6 parts of unsaturated acid ester, 0.5 - 3 parts of accelerator, and 1 - 10 parts of cross-linking agent; liquid B is composed of the following components in parts by weight: 40 - 60 parts of hemihydrate gypsum, 5 - 10 parts of silane coupling agent, 0.5 - 3 parts of initiator, and 30 - 55 parts of water; the acrylate main agent is formed by reacting acrylic acid with magnesium oxide and calcium oxide in a mass ratio of 20 - 36:10 - 15:15 - 20 under an ice bath.

Description

Technical Field

[0001] The present invention belongs to the technical field of waterproof grouting materials, and particularly relates to an environment-friendly high-strength acrylate grouting material and a preparation method thereof. Background Art

[0002] The statements herein only provide background art related to the present invention and do not necessarily constitute prior art.

[0003] Acrylate materials are mainly composed of acrylate monomers, with water as the solvent, and free radical polymerization into high-elastic gels under the action of initiators and accelerators. This material has characteristics such as high waterproofness, low viscosity, high permeability, controllable setting time, strong adhesiveness, and environmental friendliness. However, acrylate materials have problems such as low strength, high price, high expansion rate, and serious dry shrinkage. Therefore, at present, acrylate materials are only suitable for small-scale crack grouting waterproofing and plugging in building materials and tunnel engineering, and cannot be used as grouting materials for treating large-scale water inrush and reinforcing loose rock masses. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide an environment-friendly high-strength acrylate grouting material and a preparation method thereof, so as to be applicable to treating large-scale water inrush and reinforcing loose rock masses.

[0005] In order to achieve the above purpose, the present invention is realized through the following technical solutions:

[0006] In the first aspect, the present invention provides an environment-friendly high-strength acrylate grouting material, including liquid A and liquid B, and the mass ratio of liquid A to liquid B is 1:0.8 - 1.2. Among them,

[0007] Liquid A is composed of the following components in parts by weight: 65 - 121 parts of acrylate main agent, 4 - 6 parts of unsaturated acid ester, 0.5 - 3 parts of accelerator, and 1 - 10 parts of crosslinking agent;

[0008] Liquid B is composed of the following components in parts by weight: 40 - 60 parts of hemihydrate gypsum, 5 - 10 parts of silane coupling agent, 0.5 - 3 parts of initiator, and 30 - 55 parts of water;

[0009] The acrylate main agent is formed by reacting acrylic acid with magnesium oxide and calcium oxide in a mass ratio of 20 - 36:10 - 15:15 - 20 under an ice bath.

[0010] Unsaturated acid ester: can improve the crosslinking density of the material.

[0011] Accelerator: provides the reduction reaction activity in the redox reaction system, reduces the polymerization energy of acrylate, and enables it to polymerize at room temperature. Preferably, triethanolamine.

[0012] Crosslinking agent: The crosslinking agent provides three or more polymerization sites to polymerize linear acrylate molecules into a network structure.

[0013] Hemihydrate gypsum: A hydratable gelling material, preferably α-2CaSO4·H2O.

[0014] Silane coupling agent: Enhances the affinity between inorganic materials and organic materials.

[0015] Initiator: Provides the free radicals required for the polymerization reaction and the oxidation reaction activity in the redox system.

[0016] In some embodiments, the unsaturated acid ester is methyl acrylate, acrylamide, ethoxyethyl methacrylate or ethyl methacrylate; preferably water-soluble ethoxyethyl methacrylate.

[0017] In some embodiments, the promoter is sodium sulfite, ferrous salt or triethanolamine, preferably triethanolamine.

[0018] In some embodiments, the crosslinking agent is N-methylolacrylamide, polyethylene glycol diacrylate or N-N'methylene bisacrylamide, preferably polyethylene glycol diacrylate.

[0019] In some embodiments, the hemihydrate gypsum is α-2CaSO4·H2O.

[0020] In some embodiments, the silane coupling agent is silane coupling agent KH570.

[0021] In some embodiments, the initiator is ammonium persulfate or potassium persulfate.

[0022] In a second aspect, the present invention provides a method for preparing the environment-friendly high-strength acrylate grouting material, comprising the following steps:

[0023] Preparation of the acrylate main agent: Dissolve 20-36 parts of acrylic acid in 20-50 parts of water, then slowly add 10-15 parts of magnesium oxide and 15-20 parts of calcium oxide, and stir and react in an ice-water bath for 2 hours to obtain the acrylate main agent;

[0024] Mix the acrylate main agent, unsaturated acid ester, promoter and crosslinking agent evenly according to the ratio to obtain liquid A;

[0025] Mix the hemihydrate gypsum, silane coupling agent, initiator and water evenly according to the ratio to obtain liquid B;

[0026] Mix liquid A and liquid B evenly according to the mass ratio of 1:0.8-1.2 to obtain the environment-friendly high-strength acrylate grouting material.

[0027] The beneficial effects obtained by one or more of the above embodiments of the present invention are as follows:

[0028] Acrylate materials have good environmental protection, durability, waterproofness, impermeability and pressure resistance; their preparation method is simple and the cost is 40% lower than that of ordinary acrylate materials. While improving the strength of the material, it does not affect its construction and waterproof performance. Environmentally friendly high-strength acrylate grouting materials solve the problems of low strength and high cost of acrylate materials. At the same time, the materials can be used to control large-scale water gushing and reinforce loose rock masses.

[0029] α-2CaSO4·H2O is pre-treated with silane coupling agent, and the semi-hydrated gypsum is hydrated in the acrylate solution to form needle-like crystals that overlap into an inorganic network structure. This structure is interspersed in the acrylate organic gelling network. The addition of the inorganic network enables the material to overcome the problems of severe shrinkage and low strength of the original acrylate material, and the 1d compressive strength of the material can reach more than 2.4MPa, or even 4.5MPa, which can meet the requirements of material grouting, and achieve a balance between inorganic strength and organic viscosity and elasticity of the acrylate material system. DETAILED DESCRIPTION

[0030] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0031] Example 1

[0032] An acrylate grouting material is prepared by mixing 100 parts by mass of component A and 100 parts by mass of component B; wherein component A is composed of the following raw materials in parts by mass: 36 parts of acrylic acid, 10 parts of magnesium oxide, 15 parts of calcium oxide, 5 parts of polyethylene glycol diacrylate, 5 parts of ethoxyethyl methacrylate, 3 parts of triethanolamine, and 28 parts of pure water; and component B is composed of the following raw materials in parts by mass: 3 parts of potassium persulfate, 50 parts of α-2CaSO4·H2O, 7 parts of silane coupling agent KH570, and 40 parts of pure water.

[0033] The preparation method of acrylate grouting material comprises the following steps:

[0034] (1) dissolving acrylic acid in 28 parts of pure water, slowly adding magnesium oxide and calcium oxide, and reacting for 2 hours under stirring in an ice-water bath to obtain an acrylate main agent;

[0035] (2) Preparation of component A: Polyethylene glycol diacrylate, triethanolamine, ethoxyethyl methacrylate and the acrylate main agent in step 1 are mixed evenly to obtain component A.

[0036] (3) Preparation of Component B: Potassium persulfate, silane coupling agent, α-2CaSO4·H2O, and pure water were stirred and mixed evenly to obtain Component B.

[0037] (4) Preparation of acrylate grouting material: Component A and Component B were mixed evenly according to a mass ratio of 1:1 to obtain an environmentally friendly high-strength acrylate grouting material.

[0038] The performance indicators of the acrylate grouting material obtained in this example are shown in Table 1.

[0039] Example 2

[0040] An acrylate grouting material is composed of 100 parts by mass of Component A and 100 parts by mass of Component B; wherein Component A is composed of the following raw materials by mass fraction: 36 parts of acrylic acid, 10 parts of magnesium oxide, 15 parts of calcium oxide, 5 parts of polyethylene glycol diacrylate, 5 parts of ethoxyethyl methacrylate, 0.5 part of triethanolamine, and 30.5 parts of pure water; Component B is composed of the following raw materials by mass fraction: 0.5 part of potassium persulfate, 50 parts of α-2CaSO4·H2O, 7 parts of silane coupling agent KH570, and 42.5 parts of water. The preparation method is the same as that in Example 1, and the performance indicators of the acrylate grouting material obtained in this example are shown in Table 1.

[0041] Example 3

[0042] An acrylate grouting material is composed of 100 parts by mass of Component A, 100 parts by mass of Component B, and 600 parts by mass of crushed powder rock; wherein Component A is composed of the following raw materials by mass fraction: 36 parts of acrylic acid, 10 parts of magnesium oxide, 15 parts of calcium oxide, 5 parts of polyethylene glycol diacrylate, 5 parts of ethoxyethyl methacrylate, 3 parts of triethanolamine, and 28 parts of pure water; Component B is composed of the following raw materials by mass fraction: 3 parts of potassium persulfate, 50 parts of α-2CaSO4·H2O, 7 parts of silane coupling agent KH570, and 40 parts of pure water.

[0043] The preparation method is the same as that in Example 1.

[0044] The performance indicators of the acrylate grouting material and the crushed powder rock concretion obtained in this example are shown in Table 2.

[0045] Example 4

[0046] An acrylate grouting material is composed of 100 parts by mass of component A, 100 parts by mass of component B and 600 parts by mass of crushed powder rock; among which component A is composed of the following raw materials by mass: 36 parts of acrylic acid, 10 parts of magnesium oxide, 15 parts of calcium oxide, 5 parts of polyethylene glycol diacrylate, 5 parts of ethoxyethyl methacrylate, 3 parts of triethanolamine, 28 parts of pure water; component B is composed of the following raw materials by mass: 3 parts of potassium persulfate, 60 parts of α-2CaSO4·H2O, 7 parts of silane coupling agent KH570, 30 parts of pure water.

[0047] The preparation method is the same as that of Example 1.

[0048] The performance indexes of the acrylate grouting material and the crushed powder rock concretion obtained in this example are shown in Table 2.

[0049] Comparative Example 1

[0050] The difference from Example 1 is that calcium oxide is replaced by magnesium oxide, and the others are the same as Example 1.

[0051] Comparative Example 2

[0052] The difference from Example 1 is that magnesium oxide is replaced by calcium oxide, and the others are the same as Example 1.

[0053] Comparative Example 3

[0054] The difference from Example 1 is that ethoxyethyl methacrylate is omitted, and the others are the same as Example 1.

[0055] Comparative Example 4

[0056] The difference from Example 1 is that the silane coupling agent is omitted, and the others are the same as Example 1.

[0057] The performance indexes of the acrylate grouting materials prepared in Examples 1-4 and Comparative Examples 1-4 are shown in Table 1.

[0058] Table 1 Performance indexes of acrylate grouting materials

[0059]

[0060] The acrylate grouting material and the crushed powder rock concretion are prepared by mixing the acrylate grouting material and the crushed powder rock in a mass ratio of 1:3, and the particle size of the crushed powder rock is 0.02 mm. The performance indexes of the concretions prepared from the acrylate grouting materials prepared in Examples 1-4 and Comparative Examples 1-4 and the crushed powder rock are shown in Table 2.

[0061] Table 2 Performance indexes of the mixture of acrylate grouting material and crushed powder rock concretion

[0062]

[0063]

[0064] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An environmentally friendly high-strength acrylate grouting material, characterized in that: It includes liquid A and liquid B, and the mass ratio of liquid A to liquid B is 1:0.8 - 1.

2. Among them, Liquid A is composed of the following components in parts by weight: 65 - 121 parts of acrylate main agent, 4 - 6 parts of ethoxyethyl methacrylate, 0.5 - 3 parts of accelerator, and 1 - 10 parts of crosslinking agent; Liquid B is composed of the following components in parts by weight: 40 - 60 parts of hemihydrate gypsum, 5 - 10 parts of silane coupling agent, 0.5 - 3 parts of initiator, and 30 - 55 parts of water; The acrylate main agent is formed by reacting acrylic acid with magnesium oxide and calcium oxide in a mass ratio of 20 - 36:10 - 15:15 - 20 under an ice bath.

2. The environmentally friendly high-strength acrylate grouting material according to claim 1, characterized in that: The accelerator is sodium sulfite, ferrous salt or triethanolamine.

3. The environmentally friendly high-strength acrylate grouting material according to claim 2, characterized in that: The accelerator is triethanolamine.

4. The environmentally friendly high-strength acrylate grouting material according to claim 1, wherein: The crosslinking agent is N - hydroxymethylacrylamide, polyethylene glycol diacrylate or N - N’ methylene bisacrylamide.

5. The environmentally friendly high-strength acrylate grouting material according to claim 4, characterized in that: The crosslinking agent is polyethylene glycol diacrylate.

6. The environmentally friendly high-strength acrylate grouting material according to claim 1, wherein: The hemihydrate gypsum is α - 2CaSO4·H2O.

7. The environmentally friendly high-strength acrylate grouting material according to claim 1, wherein: The silane coupling agent is silane coupling agent KH570.

8. The environmentally friendly high-strength acrylate grouting material according to claim 1, characterized in that: The initiator is ammonium persulfate or potassium persulfate.

9. The preparation method of the environment-friendly high-strength acrylate grouting material according to any one of claims 1-8, characterized in that: It includes the following steps: Preparation of the acrylate main agent: Dissolve 20 - 36 parts of acrylic acid in 20 - 50 parts of water, then slowly add 10 - 15 parts of magnesium oxide and 15 - 20 parts of calcium oxide, and stir - react for 2 hours under an ice - water bath to obtain the acrylate main agent; Mix the acrylate main agent, ethoxyethyl methacrylate, accelerator and crosslinking agent evenly according to the ratio to obtain liquid A; Mix the hemihydrate gypsum, silane coupling agent, initiator and water evenly according to the ratio to obtain liquid B; Mix liquid A and liquid B evenly according to the mass ratio of 1:0.8 - 1.2 to obtain an environmentally friendly high - strength acrylate grouting material.

Images