CN116948103A - Preparation method of two-component acrylate grouting material - Google Patents
Preparation method of two-component acrylate grouting material Download PDFInfo
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- 239000000463 material Substances 0.000 title claims abstract description 61
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 title claims abstract description 49
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 72
- 239000003999 initiator Substances 0.000 claims abstract description 28
- 239000000839 emulsion Substances 0.000 claims abstract description 27
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229920001909 styrene-acrylic polymer Polymers 0.000 claims abstract description 24
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 20
- 238000002156 mixing Methods 0.000 claims abstract description 20
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 claims abstract description 15
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims abstract description 11
- 239000007864 aqueous solution Substances 0.000 claims abstract description 10
- SONHXMAHPHADTF-UHFFFAOYSA-M sodium;2-methylprop-2-enoate Chemical compound [Na+].CC(=C)C([O-])=O SONHXMAHPHADTF-UHFFFAOYSA-M 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims abstract description 6
- 229920000642 polymer Polymers 0.000 claims abstract description 4
- 239000002002 slurry Substances 0.000 claims description 38
- 238000003756 stirring Methods 0.000 claims description 16
- NIXOWILDQLNWCW-UHFFFAOYSA-N Acrylic acid Chemical class OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 14
- 238000005303 weighing Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 5
- -1 potassium ferricyanide Chemical compound 0.000 claims description 3
- 238000012360 testing method Methods 0.000 description 50
- 239000000499 gel Substances 0.000 description 17
- 230000008439 repair process Effects 0.000 description 14
- 239000000126 substance Substances 0.000 description 12
- 230000008961 swelling Effects 0.000 description 12
- 239000003795 chemical substances by application Substances 0.000 description 11
- 239000004567 concrete Substances 0.000 description 11
- 230000035699 permeability Effects 0.000 description 11
- 230000000694 effects Effects 0.000 description 10
- 230000001965 increasing effect Effects 0.000 description 10
- 150000003254 radicals Chemical class 0.000 description 9
- 239000003513 alkali Substances 0.000 description 7
- 239000004570 mortar (masonry) Substances 0.000 description 7
- 239000004576 sand Substances 0.000 description 7
- 239000007787 solid Substances 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 5
- 238000001035 drying Methods 0.000 description 5
- 238000010998 test method Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 4
- 239000000945 filler Substances 0.000 description 4
- 238000006116 polymerization reaction Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- FEIQOMCWGDNMHM-UHFFFAOYSA-N 5-phenylpenta-2,4-dienoic acid Chemical compound OC(=O)C=CC=CC1=CC=CC=C1 FEIQOMCWGDNMHM-UHFFFAOYSA-N 0.000 description 2
- 230000003487 anti-permeability effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- 231100000252 nontoxic Toxicity 0.000 description 2
- 230000003000 nontoxic effect Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 206010053567 Coagulopathies Diseases 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000035602 clotting Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000012669 compression test Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000000017 hydrogel Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 235000012222 talc Nutrition 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229920003169 water-soluble polymer Polymers 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F257/00—Macromolecular compounds obtained by polymerising monomers on to polymers of aromatic monomers as defined in group C08F12/00
- C08F257/02—Macromolecular compounds obtained by polymerising monomers on to polymers of aromatic monomers as defined in group C08F12/00 on to polymers of styrene or alkyl-substituted styrenes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/44—Polymerisation in the presence of compounding ingredients, e.g. plasticisers, dyestuffs, fillers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
The invention discloses a preparation method of a two-component acrylate grouting material, which comprises the steps of uniformly mixing an acrylate aqueous solution, a cross-linking agent and an accelerator to obtain a component A, uniformly mixing 20 parts of sodium methacrylate, 54 parts of water, 25 parts of hydroxyethyl acrylate and 1 part of diethanolamine, uniformly mixing aqueous polymer emulsion, an initiator and water to obtain a component B, wherein the component B comprises 50 parts of styrene-acrylic emulsion, 48 parts of water, 2 parts of ammonium persulfate and 3 parts of talcum powder according to the mass ratio, and the preparation of the component A and the component B of the acrylate aqueous solution grouting material is completed according to the mass ratio of 1:1.03, performing grouting operation of a double-liquid grouting pump.
Description
Technical Field
The invention relates to the field of two-component acrylate grouting materials, in particular to a preparation method of a two-component acrylate grouting material.
Background
When the defects of cracks, fissures, holes and the like which are communicated with each other exist in the concrete building, a water seepage channel is formed to generate seepage, and water seepage can cause the precipitation of calcified substances of the concrete, so that the strength of the concrete is reduced and the internal structure is damaged finally. The seepage and water leakage of concrete are common problems in civil engineering and hydraulic engineering, the impermeability and the overall safety of the concrete of the injected building can be improved through grouting, the internal conditions are improved, the effects of seepage prevention, reinforcement and water shutoff are achieved, and grouting is a better method for solving the problems at present.
The acrylate grouting material has good physical and mechanical properties and impermeability restoration performance, has the advantages of low viscosity, capability of being injected into micro cracks, controllable gel time, low permeability coefficient of a condensate and the like, and is widely applied to restoration of dam waterproof curtains, weathered strata, hydraulic engineering, tunnel engineering and underground engineering. With the development of technology, most of the currently used crosslinking agents are nontoxic, so that the prepared acrylate grouting material is basically nontoxic.
Under the development demands of a large number of projects, the performance requirements on the acrylate grouting materials in the entity projects are higher and higher. In recent years, the research shows that the acrylate grouting material has good anti-seepage repair performance, but the slurry of the existing acrylate grouting material has low solid content, and the cured product is easy to leak again after drying and shrinking; in addition, the slurry has fewer active ingredients and poor durability after repairing concrete cracks. The slurry developed by the method can achieve a certain use effect in the working performance, but the acrylic grouting material is complex in synthesis, multiple in related factors, high in technical difficulty and poor in economy, and simultaneously brings great challenges to large-scale popularization and application of the acrylic grouting material. Therefore, the low cost and high performance are key to the popularization and application of the acrylate grouting material.
Therefore, it is necessary to study the improvement of the anti-seepage repair performance and the physical and mechanical properties of the acrylate grouting material, and study the water-swelling, drying shrinkage, sand-fixing body compressive strength and the like of the consolidated body. The preparation of the acrylate grouting material enhances the impermeability, reduces the volume shrinkage of a cured body and remarkably reduces the production cost.
Disclosure of Invention
First, the technical problem to be solved
In order to overcome the defects in the prior art, a preparation method of a two-component acrylate grouting material is provided so as to solve the problems in the background art.
(II) technical scheme
The invention is realized by the following technical scheme: the invention provides a preparation method of a two-component acrylate grouting material, which is characterized by comprising the following steps of: the grouting material consists of a first component and a second component, and the preparation steps of the first component and the second component are as follows in parts by weight:
s1: preparing a component A, namely weighing 20 parts of sodium methacrylate and 54 parts of water, and uniformly mixing and stirring for later use; weighing 25 parts of hydroxyethyl acrylate and 1 part of diethanolamine for standby;
s2: and adding the weighed hydroxyethyl acrylate and diethanolamine into the aqueous solution of acrylic acid salt, uniformly stirring for 3 minutes, and uniformly mixing to form the component A.
S3: preparing a component B, weighing 50 parts of styrene-acrylic emulsion, 48 parts of water and 2 parts of ammonium persulfate, mixing, uniformly stirring for 3 minutes, and uniformly stirring the slurry for later use;
s4: 3 parts of talcum powder is weighed, the standby liquid of the component B is added, and the mixture is stirred at constant speed for 3 minutes and uniformly mixed to form the component B.
S5: adding 0.01-0.10 part of potassium ferricyanide into the component B based on the total weight of the component B, uniformly stirring for 3 minutes, uniformly mixing, and controlling the gel time of the grouting material;
s6: the mass ratio of the component A to the component B is 1:1.03, the preparation of the component A and the component B of the double-component acrylate grouting material is completed.
Further, the component A comprises 20 parts of sodium methacrylate, 54 parts of water, 25 parts of hydroxyethyl acrylate and 1 part of diethanolamine in mass ratio, and the aqueous solution of acrylate, the cross-linking agent and the accelerator are uniformly mixed to obtain the component A.
Further, the component B consists of 50 parts of styrene-acrylic emulsion, 48 parts of water, 2 parts of ammonium persulfate and 3 parts of talcum powder according to the mass ratio, and the aqueous polymer emulsion, the initiator and the water are uniformly mixed to obtain the component B.
(III) beneficial effects
Compared with the prior art, the invention has the following beneficial effects:
(1) When the main acrylate agent and the cross-linking agent are sodium methacrylate and hydroxyethyl acrylate, the prepared acrylate grouting material is detected, and the slurry is easy to disperse, low in viscosity, good in permeability and stable in physical and mechanical properties.
(2) When the proportion of the acrylate main agent and the cross-linking agent in the component A is respectively 20 parts and 25 parts, the proportion of the water and the diethanolamine is respectively 54 parts and 1 part; the proportion of the styrene-acrylic and water in the component B is 50 parts and 48 parts, when the proportion of the ammonium persulfate is 2 parts, the improvement of the physical property of the curing agent and the proportion of the cross-linking agent are in positive correlation, the compressive strength of the sand-fixing body is gradually increased along with the increase of the proportion of the cross-linking agent, the permeability coefficient and the water expansion rate are gradually reduced, the compressive strength of the sand-fixing body is 385kPa, and the permeability coefficient is 2.01x10 -8 cm/s, and the water swelling rate is 310 percent.
(3) When the proportion of the acrylate main agent and the cross-linking agent in the component A is respectively 20 parts and 25 parts, the proportion of the water and the diethanolamine is respectively 54 parts and 1 part; when the ratio of the styrene-acrylic acid to the water in the component B is 50 parts and 48 parts, the use of the initiator has a strong effect on the setting time of the slurry, the setting time of the slurry is reduced along with the increase of the use amount of the initiator, and when the ratio of the initiator is 6 parts, the setting time is 132 seconds. This is because the more initiator, the more radicals are generated, the faster the polymerization rate and the shorter the curing time. According to the setting time test results, 1 part of accelerator, 2 parts of initiator and the setting time of the slurry was 240 seconds.
(4) The characteristic of the two-component acrylate grouting material in the anti-seepage repair test is that the repaired gap starts to have water seepage points under the action of water pressure, and the two-component acrylate grouting material is continuously pressurized and slowly converged into water drops. When the proportion of the acrylate main agent and the cross-linking agent in the component A is respectively 20 parts and 25 parts, the proportion of the water and the diethanolamine is respectively 54 parts and 1 part; the proportion of the styrene-acrylic and water in the component B is 50 parts and 48 parts, and when the proportion of the ammonium persulfate is 2 parts, the water pressure for the concrete anti-seepage repair reaches the maximum and is 1.0 megaPa. The coupling relation between the slurry and the mortar test block in the anti-seepage test is different in different formulas, and the repairing water seepage pressure value is minimum when the styrene-acrylic emulsion accounts for 35 parts and is 0.6 megapascal; the styrene-acrylic emulsion has the highest proportion of 50 parts and 1.0 megaPa, and the repairing test piece is subjected to 3 days, 7 days and 14 days of penetration tests, so that the repairing water pressure is not reduced due to drying shrinkage. The styrene-acrylic emulsion is added, so that the solid content of the slurry is improved, the volume shrinkage of a solidified body is reduced, and the durability of grouting repair is ensured.
(5) When the proportion of the acrylate main agent and the cross-linking agent in the component A is respectively 20 parts and 25 parts, the proportion of the water and the diethanolamine is respectively 54 parts and 1 part; the weight ratio of the styrene-acrylic acid to the water in the component B is 50 parts and 48 parts, and when the weight ratio of the ammonium persulfate is 2 parts, the alkali resistance of the slurry solidified substance can be obviously improved by adding 3 parts of talcum powder. The talcum powder can improve the physical and chemical properties of the acrylate solidified material, improve the compactness of the solidified body and increase the compressive strength of the sand-fixing body.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The invention provides a preparation method of a two-component acrylate grouting material, which is characterized by comprising the following steps of: the grouting material consists of a first component and a second component, and the preparation steps of the first component and the second component are as follows in parts by weight:
s1: preparing a component A, namely weighing 20 parts of sodium methacrylate and 54 parts of water, and uniformly mixing and stirring for later use; weighing 25 parts of hydroxyethyl acrylate and 1 part of diethanolamine for standby;
s2: and adding the weighed hydroxyethyl acrylate and diethanolamine into the aqueous solution of acrylic acid salt, uniformly stirring for 3 minutes, and uniformly mixing to form the component A.
S3: preparing a component B, weighing 50 parts of styrene-acrylic emulsion, 48 parts of water and 2 parts of ammonium persulfate, mixing, uniformly stirring for 3 minutes, and uniformly stirring the slurry for later use;
s4: 3 parts of talcum powder is weighed, the standby liquid of the component B is added, and the mixture is stirred at constant speed for 3 minutes and uniformly mixed to form the component B.
S5: adding 0.01-0.10 part of potassium ferricyanide into the component B based on the total weight of the component B, uniformly stirring for 3 minutes, uniformly mixing, and controlling the gel time of the grouting material;
s6: the mass ratio of the component A to the component B is 1:1.03, the preparation of the component A and the component B of the double-component acrylate grouting material is completed.
The preparation of the first component and the second component of the acrylic acid salt aqueous solution grouting material is completed, wherein the mass ratio of the first component to the second component is 1:1.03, grouting operation of a double-liquid grouting pump
Further, the component A comprises 20 parts of sodium methacrylate, 54 parts of water, 25 parts of hydroxyethyl acrylate and 1 part of diethanolamine in mass ratio, and the aqueous solution of acrylate, the cross-linking agent and the accelerator are uniformly mixed to obtain the component A.
Further, the component B consists of 50 parts of styrene-acrylic emulsion, 48 parts of water, 2 parts of ammonium persulfate and 3 parts of talcum powder according to the mass ratio, and the aqueous polymer emulsion, the initiator and the water are uniformly mixed to obtain the component B.
The application method of the acrylate aqueous solution grouting material comprises the step of injecting the first component and the second component into a gap by using a double-liquid grouting pump.
The base stock for preparing each component of the present invention is commercially available.
The invention is further illustrated by the following experiments:
during the test, the initial proportion is determined by a three-factor four-level orthogonal test, the mass ratio of the acrylate main agent and the cross-linking agent in the component A, and the mass ratio of the styrene-acrylic emulsion in the component B are taken as the three factors of the orthogonal test, and the permeability coefficient, the sand-fixation body compressive strength and the water expansion rate of each group proportion are inspected. The mass ratio of the accelerator in the component A to the initiator in the component B is fixed, and is 1 part and 2 parts respectively. The mass ratio of the component A to the component B in the research stage is 1:1.
Orthogonal test protocol table:
| recipe numbering | A styrene-acrylic emulsion (part) | B crosslinking agent (parts) | C acrylic acid salt (part) |
| 1 | 35 | 15 | 15 |
| 2 | 35 | 20 | 20 |
| 3 | 35 | 25 | 25 |
| 4 | 35 | 30 | 30 |
| 5 | 40 | 15 | 20 |
| 6 | 40 | 20 | 15 |
| 7 | 40 | 25 | 30 |
| 8 | 40 | 30 | 25 |
| 9 | 45 | 15 | 25 |
| 10 | 45 | 20 | 30 |
| 11 | 45 | 25 | 15 |
| 12 | 45 | 30 | 20 |
| 13 | 50 | 15 | 30 |
| 14 | 50 | 20 | 25 |
| 15 | 50 | 25 | 20 |
| 16 | 50 | 30 | 15 |
Accordingly, the test shows that:
orthogonal test results table:
the permeability coefficient test was performed with reference to the GB/T50123-2019 (geotechnical test method Standard) permeability test method. Pouring the prepared acrylic acid salt grouting material slurry into a cutting ring, enabling the slurry to form a solidified substance in the cutting ring, standing for 1d, then installing the cutting ring filled with the solidified substance into a permeation container, and performing permeation test according to a variable water head permeation test method. The sand fixing body compression test adopts a test mold with the inner diameter of 40mm and the height of 100mm, six test pieces of each group of sand fixing body compression strength test are firstly filled in a human test mold with standard sand which is uniformly mixed, the surface of the standard sand slightly exceeds the top surface of the test mold during sand filling, then the top of the prepared slurry sand is slowly poured into the sand, and grouting is stopped when the top visible slurry overflows. And (3) trowelling the surface along the edge of the test die after the slurry is gelled, covering and curing the surface with a preservative film, removing the die after 24 hours, and measuring the compressive strength. And (3) water expansion rate test, namely filling the prepared slurry into a plastic pipe with the inner diameter of 10mm, taking out the solidified substance when the slurry forms gel in the plastic pipe and is solidified, and cutting into test pieces with the length of 50mm when the slurry is in the 1d age, wherein each group of three test pieces. It is immersed in distilled water, and calculated after its expansion volume is stabilized. And the impermeability repair test adopts a mortar impermeability instrument to measure the mortar test block after grouting repair.
Orthogonal test penetration coefficient range analysis table:
table of analysis of the compressive strength of the sand-fixation body in the orthogonal test:
orthogonal test water swelling ratio extremely poor analysis table:
the orthogonal test results are subjected to extremely poor analysis, and the major and minor orders affecting the permeability coefficient of the grouting material solidified substance, the compressive strength of the sand-fixing body and the factors of the water expansion rate are as follows: crosslinking agent > acrylate main agent > styrene-acrylic emulsion.
The analysis shows that the cross-linking agent has the greatest influence on the mechanical properties of the grouting material. Because the cross-linking agent plays a bridging role among acrylic acid salt molecules, the polyacrylate molecules are mutually bonded and cross-linked, the internal structure of the solidified material is changed, the space gel network in the acrylic acid salt solidified material becomes compact, and the action of water molecules is limited, so that the permeability of the acrylic acid salt grouting material is improved. When the amount of the cross-linking agent is increased, the number of cross-linking points in the gel is increased, the network space is reduced, and the physical and chemical actions among networks are enhanced, so that the compressive strength of the sand-fixing body is improved, and the water swelling rate is reduced. The influence of the acrylate main agent on the mechanical property of the acrylate grouting material is only inferior to that of the cross-linking agent, when the concentration of the acrylate solution is increased, the electrostatic repulsive force between ions is increased, so that the water retention capacity of the gel is reduced, and the water swelling rate is reduced.
The influence of the styrene-acrylic emulsion on the permeability coefficient and the sand-fixing body strength of the grouting material is smaller than that of the main agent and the cross-linking agent. The styrene-acrylic emulsion has better compatibility and durability between the water-soluble polymer emulsion and concrete, is often used for preparing waterproof paint, and can increase the solid content of the slurry and improve the durability of a solidified substance by adding the styrene-acrylic emulsion into the slurry, so that the styrene-acrylic emulsion has lower volume shrinkage and reduces the risk of re-leakage. When the content of the styrene-acrylic emulsion is lower than 35 parts of the component B, the solid content of the cured product is lower, the shrinkage rate is larger, and the re-leakage is easy to occur again after the drying. However, the viscosity of the styrene-acrylic emulsion is too high, and excessive addition can influence the viscosity of the grouting material, thereby influencing the grouting penetration effect of the slurry.
Finally, considering the comprehensive performance of the grouting material, the 15 th group has excellent effect on physical and mechanical properties in the orthogonal test.
In particular, the effect of accelerator and initiator content on the performance of the acrylic grouting material
Based on a test method, the 15 th group with better physical and mechanical properties and water expansion rate in the orthogonal test is selected to examine the influence of the accelerators and initiators with different mass fractions on the setting time and the water expansion rate
The 15 th formulation was used as the test group,
and (3) taking diethanolamine with different mass fractions as an accelerator, taking ammonium persulfate as an initiator to carry out a setting time test and a water swelling ratio test, and observing the setting time and the water swelling ratio of the concretes formed in the induction period after the slurry is mixed.
The clotting time test results were as follows:
| initiator(s) | 1 part of | 2 parts of | 3 parts of | 4 parts of | 5 parts of | 6 parts of |
| Coagulation time(s) | 282 | 240 | 206 | 172 | 150 | 132 |
It follows from the table that when the initiator level is unchanged, the setting time decreases and then increases with increasing accelerator content. Because the accelerator has double functions on decomposing free radicals by the initiator, the accelerator not only can guide the initiator to generate the free radicals, but also can generate neutralization reaction with the free radicals, so that the free radicals are reduced, and the curing time of the slurry is prolonged. Less accelerator, less neutralization with initiator, greater radical concentration, faster polymerization rate and less cure time. When the accelerator is used in an amount of less than 2 parts, its accelerating effect on the decomposition of the free radical by the initiator is reduced, the concentration of the free radical is reduced, the polymerization rate is slowed down, and the curing time is increased. When the accelerator level is fixed, the cure time decreases as the initiator level increases. This is because the more initiator, the more radicals are generated, the faster the polymerization rate and the shorter the curing time. When the accelerator is used in a fixed amount, the setting time gradually decreases as the initiator content increases.
The water swell ratio test results are as follows:
| accelerating agent | 1 part of | 2 parts of | 3 parts of | 4 parts of | 5 parts of | 6 parts of |
| Expansion ratio in water | 310％ | 320％ | 335％ | 343％ | 352％ | 356％ |
| Initiator(s) | 1 part of | 2 parts of | 3 parts of | 4 parts of | 5 parts of | 6 parts of |
| Expansion ratio in water | 302％ | 310％ | 340％ | 347％ | Slightly damaged | Breakage of |
As the amount of accelerator and oxidizer increases, the water swell ratio of the gel increases. However, the increase of accelerator can increase the coagulation time of gel, and when the amount of initiator is increased, the gel volume is excessively expanded to reduce the strength and damage after absorbing water molecules to a certain limit. Too much initiator addition reduces the setting time, but the slurry contains a large number of pores after setting, which affects the physical and mechanical properties.
The test results of the setting time and the water swelling ratio show that the accelerator has double functions on the setting time of the slurry, not only can promote the setting of the slurry, but also can delay the setting time, and the setting time of the slurry is the shortest when the mixing amount is 2 parts. The initiator can shorten the slurry setting time, and the slurry setting time is 132 seconds when the mixing amount is 6 parts. The accelerator and the initiator have an increasing effect on the water swelling rate, but when the mixing amount of the initiator exceeds 4 parts, pores appear on the surface of the cured product, the cured product is damaged after swelling in water, and the physical and mechanical properties of the cured product are affected.
Specifically, talcum powder affects the performance of grouting materials.
Based on the test method, a single factor test was set with a talc loading of 1 part, 2 parts, 3 parts, 4 parts, 5 parts.
The filler can improve the physical and chemical properties of the gel, and the reliability and durability of the acrylate grouting material are improved. In order to study the influence of the filler on the acrylate grouting material, talcum powder is selected to examine the influence of contents of 1 part, 2 parts, 3 parts, 4 parts and 5 parts on the alkali resistance of the grouting material.
The cured product of the acrylate grouting material was placed in an alkaline solution at pH13 for 24 hours, and the cured product was observed. The talcum powder has better alkali resistance, the alkali resistance is gradually improved along with the increase of the consumption of the filler, and when the mixing amount is 3 parts or more, the gel state is good and no obvious corrosion phenomenon occurs. Based on better performance of talcum powder on alkali resistance of slurry, influence on viscosity, water expansion rate and sand-fixation strength of grouting material is examined
The viscosity test results are as follows:
| talc powder | 1 part of | 2 parts of | 3 parts of | 4 parts of | 5 parts of | 6 parts of |
| Viscosity (mPa. S) | 6.22 | 6.55 | 6.85 | 7.35 | 7.90 | 8.55 |
The test results of the compressive strength of the sand-fixing body are as follows:
| talc powder | 1 part of | 2 parts of | 3 parts of | 4 parts of | 5 parts of | 6 parts of |
| Compressive strength (kPa) | 385 | 392 | 402 | 410 | 416 | 420 |
The water swell ratio test results are as follows:
| talc powder | 1 part of | 2 parts of | 3 parts of | 4 parts of | 5 parts of | 6 parts of |
| Expansion ratio in water (%) | 310 | 295 | 283 | 270 | 260 | 242 |
The water swelling rate of the gel is reduced after the talcum powder is added into the grouting material, and the water swelling rate is gradually reduced along with the increase of the talcum powder doping amount. The gel material is compacted due to the addition of the talcum powder, and the talcum powder enters between the acrylic acid salt molecular crosslinking points to occupy part of space, so that the water molecules contained in the hydrogel are reduced, and the water swelling rate is reduced. The more the talcum powder is used, the more compact the gel is, and the greater the strength of the sand-fixing body is. The talcum powder has good suspension property and easy dispersibility, and can play a framework role as a filler among acrylic acid salt molecules, so that the compressive strength and stability of the sand-fixing body are improved. Talcum powder is used as an inorganic filler, so that the physical and mechanical properties of the acrylate grouting material can be improved, the alkali resistance of a consolidated body of the acrylate grouting material is enhanced, but excessive use can cause the viscosity of slurry to be increased, the permeability of the slurry is reduced, and the grouting effect is affected. 3 parts of talcum powder is selected and used by combining the alkali resistance, viscosity, water expansion rate and sand-fixing body compressive strength of talcum powder.
And researching the anti-permeability repair performance of the 15 th formula through an anti-permeability repair experiment. The experimental condition shows that the water seepage occurs along the crack of the mortar test block after grouting repair under the action of water pressure, the leakage point is formed from the bottom of the test block to the top through gel, the leakage point is continuously pressurized and slowly converged into water drops, and the leakage condition is not aggravated. And breaking the mortar test block to observe grouting repair conditions, and finding that the grouting effect of the slurry along the gap of the test piece is good and the gap is completely filled. The test piece breaks along the inner part of the gel after breaking, the adhesion between the solidified substance and the mortar test piece is good, and the adhesion strength with the test piece is higher than that of the material. The water seepage pressure is 1.0 megapascal, and the repairing mortar test piece is subjected to impervious tests for 3 days, 7 days and 14 days, so that the acrylate curing material and the concrete crack are bonded into a whole, the solid content of the slurry is improved by adding the styrene-acrylic emulsion, the drying shrinkage of the curing material is reduced, and the impervious effect is improved. When the content of the styrene-acrylic emulsion in the component B is 50 parts, the water pressure for anti-seepage repair is 1.0 megaPa, so that the anti-seepage repair can be effectively carried out on concrete cracks, the solid content of the slurry is improved by the styrene-acrylic emulsion, the volume shrinkage of a solidified substance is reduced, and the durability of the acrylate grouting repair is improved.
The above examples are merely illustrative of the preferred embodiments of the present invention and are not intended to limit the spirit and scope of the present invention. Various modifications and improvements of the technical scheme of the present invention will fall within the protection scope of the present invention without departing from the design concept of the present invention, and the technical content of the present invention is fully described in the claims.
Claims (3)
1. A preparation method of a two-component acrylate grouting material is characterized by comprising the following steps: the grouting material consists of a first component and a second component, and the preparation steps of the first component and the second component are as follows in parts by weight:
s1: preparing a component A, namely weighing 20 parts of sodium methacrylate and 54 parts of water, and uniformly mixing and stirring for later use;
weighing 25 parts of hydroxyethyl acrylate and 1 part of diethanolamine for standby;
s2: adding the weighed hydroxyethyl acrylate and diethanolamine into the aqueous solution of acrylic acid salt, uniformly stirring for 3 minutes, and uniformly mixing to form a component A;
s3: preparing a component B, weighing 50 parts of styrene-acrylic emulsion, 48 parts of water and 2 parts of ammonium persulfate, mixing, uniformly stirring for 3 minutes, and uniformly stirring the slurry for later use;
s4: weighing 3 parts of talcum powder, adding the second component standby liquid, uniformly stirring for 3 minutes, and uniformly mixing to form the second component;
s5: adding 0.01-0.10 part of potassium ferricyanide into the component B based on the total weight of the component B, uniformly stirring for 3 minutes, uniformly mixing, and controlling the gel time of the grouting material;
s6: the mass ratio of the component A to the component B is 1:1.03, the preparation of the component A and the component B of the double-component acrylate grouting material is completed.
2. The method for preparing the two-component acrylate grouting material according to claim 1, which is characterized in that: the component A consists of 20 parts of sodium methacrylate, 54 parts of water, 25 parts of hydroxyethyl acrylate and 1 part of diethanolamine in mass ratio, and the aqueous solution of acrylate, the cross-linking agent and the accelerator are uniformly mixed to obtain the component A.
3. The method for preparing the two-component acrylate grouting material according to claim 1, which is characterized in that: the component B consists of 50 parts of styrene-acrylic emulsion, 48 parts of water, 2 parts of ammonium persulfate and 3 parts of talcum powder according to the mass ratio, and the aqueous polymer emulsion, the initiator and the water are uniformly mixed to obtain the component B.
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