CN117645502B - Surface sealing coating for repairing concrete cracks - Google Patents
Surface sealing coating for repairing concrete cracks Download PDFInfo
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- CN117645502B CN117645502B CN202410127862.4A CN202410127862A CN117645502B CN 117645502 B CN117645502 B CN 117645502B CN 202410127862 A CN202410127862 A CN 202410127862A CN 117645502 B CN117645502 B CN 117645502B
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- surface sealing
- sealing coating
- polymerization inhibitor
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- 239000011248 coating agent Substances 0.000 title claims abstract description 48
- 238000000576 coating method Methods 0.000 title claims abstract description 48
- 238000007789 sealing Methods 0.000 title claims abstract description 40
- 239000004567 concrete Substances 0.000 title claims abstract description 31
- 239000000843 powder Substances 0.000 claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000007788 liquid Substances 0.000 claims abstract description 3
- 238000006116 polymerization reaction Methods 0.000 claims description 45
- 239000000839 emulsion Substances 0.000 claims description 34
- QIGBRXMKCJKVMJ-UHFFFAOYSA-N 1,4-Benzenediol Natural products OC1=CC=C(O)C=C1 QIGBRXMKCJKVMJ-UHFFFAOYSA-N 0.000 claims description 32
- 239000004593 Epoxy Substances 0.000 claims description 31
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 30
- 239000003822 epoxy resin Substances 0.000 claims description 28
- 239000003112 inhibitor Substances 0.000 claims description 28
- 229920000647 polyepoxide Polymers 0.000 claims description 28
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 27
- 239000004568 cement Substances 0.000 claims description 27
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 26
- 125000002723 alicyclic group Chemical group 0.000 claims description 24
- 239000003999 initiator Substances 0.000 claims description 24
- 239000011344 liquid material Substances 0.000 claims description 21
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 18
- 238000002156 mixing Methods 0.000 claims description 18
- 238000006243 chemical reaction Methods 0.000 claims description 17
- 125000003700 epoxy group Chemical group 0.000 claims description 17
- 238000002360 preparation method Methods 0.000 claims description 16
- -1 3, 4-epoxy cyclohexylmethyl Chemical group 0.000 claims description 15
- NCAVPEPBIJTYSO-UHFFFAOYSA-N 4-hydroxybutyl prop-2-enoate;2-(oxiran-2-ylmethoxymethyl)oxirane Chemical compound C1OC1COCC1CO1.OCCCCOC(=O)C=C NCAVPEPBIJTYSO-UHFFFAOYSA-N 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 14
- YXALYBMHAYZKAP-UHFFFAOYSA-N 7-oxabicyclo[4.1.0]heptan-4-ylmethyl 7-oxabicyclo[4.1.0]heptane-4-carboxylate Chemical compound C1CC2OC2CC1C(=O)OCC1CC2OC2CC1 YXALYBMHAYZKAP-UHFFFAOYSA-N 0.000 claims description 13
- 239000012986 chain transfer agent Substances 0.000 claims description 13
- 239000004408 titanium dioxide Substances 0.000 claims description 13
- 229910021487 silica fume Inorganic materials 0.000 claims description 12
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 claims description 11
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims description 11
- 239000006004 Quartz sand Substances 0.000 claims description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 11
- 230000009471 action Effects 0.000 claims description 11
- 239000003638 chemical reducing agent Substances 0.000 claims description 11
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical group O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims description 11
- 230000000844 anti-bacterial effect Effects 0.000 claims description 10
- 239000003899 bactericide agent Substances 0.000 claims description 10
- SONHXMAHPHADTF-UHFFFAOYSA-M sodium;2-methylprop-2-enoate Chemical compound [Na+].CC(=C)C([O-])=O SONHXMAHPHADTF-UHFFFAOYSA-M 0.000 claims description 10
- SHZGCJCMOBCMKK-UHFFFAOYSA-N D-mannomethylose Natural products CC1OC(O)C(O)C(O)C1O SHZGCJCMOBCMKK-UHFFFAOYSA-N 0.000 claims description 9
- PNNNRSAQSRJVSB-UHFFFAOYSA-N L-rhamnose Natural products CC(O)C(O)C(O)C(O)C=O PNNNRSAQSRJVSB-UHFFFAOYSA-N 0.000 claims description 9
- 239000002253 acid Substances 0.000 claims description 9
- PNNNRSAQSRJVSB-BXKVDMCESA-N aldehydo-L-rhamnose Chemical group C[C@H](O)[C@H](O)[C@@H](O)[C@@H](O)C=O PNNNRSAQSRJVSB-BXKVDMCESA-N 0.000 claims description 9
- 150000001412 amines Chemical class 0.000 claims description 9
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 9
- 239000008367 deionised water Substances 0.000 claims description 9
- 229910021641 deionized water Inorganic materials 0.000 claims description 9
- 229920001921 poly-methyl-phenyl-siloxane Polymers 0.000 claims description 9
- CWERGRDVMFNCDR-UHFFFAOYSA-N thioglycolic acid Chemical compound OC(=O)CS CWERGRDVMFNCDR-UHFFFAOYSA-N 0.000 claims description 9
- HVOBSBRYQIYZNY-UHFFFAOYSA-N 2-[2-(2-aminoethylamino)ethylamino]ethanol Chemical group NCCNCCNCCO HVOBSBRYQIYZNY-UHFFFAOYSA-N 0.000 claims description 8
- 150000008064 anhydrides Chemical class 0.000 claims description 8
- 238000006482 condensation reaction Methods 0.000 claims description 7
- 238000010526 radical polymerization reaction Methods 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 239000008030 superplasticizer Substances 0.000 claims description 4
- 239000004034 viscosity adjusting agent Substances 0.000 claims description 4
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 3
- VUXKVKAHWOVIDN-UHFFFAOYSA-N Cyclohexyl formate Chemical compound O=COC1CCCCC1 VUXKVKAHWOVIDN-UHFFFAOYSA-N 0.000 claims description 2
- 229920000877 Melamine resin Polymers 0.000 claims description 2
- 239000011398 Portland cement Substances 0.000 claims description 2
- 239000003513 alkali Substances 0.000 claims description 2
- 239000002518 antifoaming agent Substances 0.000 claims description 2
- 125000000687 hydroquinonyl group Chemical group C1(O)=C(C=C(O)C=C1)* 0.000 claims description 2
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims description 2
- 230000003472 neutralizing effect Effects 0.000 claims description 2
- 239000003469 silicate cement Substances 0.000 claims description 2
- 230000000903 blocking effect Effects 0.000 claims 1
- 230000001070 adhesive effect Effects 0.000 abstract description 10
- 230000007797 corrosion Effects 0.000 abstract description 6
- 238000005260 corrosion Methods 0.000 abstract description 6
- 238000003756 stirring Methods 0.000 description 30
- 238000000034 method Methods 0.000 description 14
- 229920000642 polymer Polymers 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 13
- 239000002994 raw material Substances 0.000 description 11
- 239000013530 defoamer Substances 0.000 description 9
- 239000000178 monomer Substances 0.000 description 9
- 239000000243 solution Substances 0.000 description 8
- 239000007864 aqueous solution Substances 0.000 description 7
- 238000005336 cracking Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 238000001816 cooling Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000004035 construction material Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 239000004574 high-performance concrete Substances 0.000 description 2
- 229920002521 macromolecule Polymers 0.000 description 2
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 125000000542 sulfonic acid group Chemical group 0.000 description 2
- 229920001059 synthetic polymer Polymers 0.000 description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 229920002125 Sokalan® Polymers 0.000 description 1
- 150000008065 acid anhydrides Chemical class 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000003487 anti-permeability effect Effects 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 102220347504 c.86A>C Human genes 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920006254 polymer film Polymers 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- SZHIIIPPJJXYRY-UHFFFAOYSA-M sodium;2-methylprop-2-ene-1-sulfonate Chemical compound [Na+].CC(=C)CS([O-])(=O)=O SZHIIIPPJJXYRY-UHFFFAOYSA-M 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5076—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with masses bonded by inorganic cements
- C04B41/5079—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/60—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone
- C04B41/61—Coating or impregnation
- C04B41/65—Coating or impregnation with inorganic materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00293—Materials impermeable to liquids
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/72—Repairing or restoring existing buildings or building materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/10—Mortars, concrete or artificial stone characterised by specific physical values for the viscosity
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Sealing Material Composition (AREA)
Abstract
The invention discloses a surface sealing coating for repairing concrete cracks, which comprises a powder component A and a liquid component B, and is mechanically stirred uniformly to obtain a finished product. The surface sealing coating has the characteristics of excellent adhesive property, good crack resistance, water resistance, strong corrosion resistance and good durability, is suitable for repairing concrete surface cracks, and improves the durability of concrete.
Description
Technical Field
The invention relates to the technical field of polymer-based functional composite materials, in particular to a surface sealing coating for repairing concrete cracks.
Background
Concrete is one of the most widely used engineering construction materials as an important construction material. With the progress of modern construction technology and technology, high-strength high-performance concrete has become a major development direction of industrial and civil buildings, however, in actual practice, a plurality of factors have caused the problem that high-strength grade concrete is easy to crack. On one hand, the cracks can reduce the strength of the concrete, on the other hand, corrosive gas and water in the air can enter the concrete through the cracks to corrode the internal reinforcing steel bars, so that structural damage is generated in the concrete, various mechanical properties of the high-performance concrete are reduced, and particularly the durability of the concrete structure is greatly reduced, so that the cracks in the concrete building material must be repaired in time, and the service life of the building material is prolonged.
Common concrete crack repairing methods include a pressure grouting method, a filling sealing method, an injection method, a surface coating sealing method and the like. The surface coating sealing method is the crack repairing method with the simplest operation, but the used material has the defects of poor flexibility and weak adhesion, and is easy to cause the problem of secondary cracking or falling off, thereby influencing the durability, and how to prepare the surface coating material with excellent adhesion performance, good cracking resistance, strong corrosion resistance and good durability becomes the technical problem to be solved at present.
Disclosure of Invention
Aiming at the problems that the existing concrete crack repairing material is poor in flexibility and weak in adhesive force, secondary cracking or falling is easy to cause, so that the durability of concrete is affected, the invention aims to provide the surface sealing coating for repairing the concrete cracks, which has the characteristics of excellent adhesive property, good crack resistance, water resistance, strong corrosion resistance and good durability, is suitable for repairing the concrete surface cracks, and improves the durability of the concrete.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
a surface sealing coating for repairing concrete cracks comprises a powder material A component and a liquid material B component;
the powder A comprises the following components in parts by weight:
10-45 parts of white cement;
10-35 parts of ash cement;
30-45 parts of quartz sand;
4-15 parts of silica fume powder;
0.1-2 parts of superplasticizer;
0.1-0.3 part of viscosity modifier;
0.3-0.5 part of anti-alkali flashing agent;
4-10 parts of titanium dioxide;
the liquid material B comprises the following components in parts by weight:
50-94 parts of alicyclic epoxy modified acrylic emulsion;
5-48 parts of deionized water;
0.2-0.5 parts of bactericide;
0.5-2 parts of defoaming agent;
the mass ratio of the powder material A component to the liquid material B component is 100: 50-70 parts;
the preparation method of the alicyclic epoxy modified acrylic emulsion comprises the following steps:
s1, performing condensation reaction on 3, 4-epoxy cyclohexylmethyl 3, 4-epoxy cyclohexylformate and double-bond-containing anhydride under the action of a polymerization inhibitor and an amine accelerator to obtain double-bond-modified epoxy resin;
s2, mixing double bond modified epoxy resin with hydroxyethyl acrylate, methacrylic acid, sodium methacrylate sulfonate and 4-hydroxybutyl acrylate glycidyl ether, and carrying out free radical polymerization under the action of an initiator, a chain transfer agent and a polymerization inhibitor to obtain the alicyclic epoxy modified acrylic emulsion.
The 3, 4-epoxy cyclohexyl methyl 3, 4-epoxy cyclohexyl formate has high activity and polarity epoxy groups, has six-membered rings, has certain rigidity, and can be combined with the polar groups of the concrete interface to form chemical bonds, so that the bonding performance and the tensile strength are greatly improved.
Further, in step S1, the double bond-containing acid anhydride is maleic anhydride. The invention utilizes the characteristic that the double bond-containing anhydride has unsaturated double bonds and can react with epoxy resin, and can introduce active double bonds on the epoxy resin, and simultaneously introduce polar groups, thereby being beneficial to obtaining high bonding performance.
Further, in the step S1, the mass ratio of the 3, 4-epoxycyclohexylmethyl 3, 4-epoxycyclohexylformate to the double bond-containing anhydride is 35-50: 5-15.
In step S1, the amine accelerator is hydroxyethyl diethylenetriamine, the polymerization inhibitor is hydroquinone, and the mass ratio of the amine accelerator, the polymerization inhibitor and the 3, 4-epoxycyclohexylmethyl 3, 4-epoxycyclohexylformate is 1-5: 0.01 to 0.03: 35-50. The invention can shorten the condensation reaction time and reduce the condensation reaction temperature by introducing a proper amount of amine accelerator, and the polymerization inhibitor can prevent double bonds from undergoing polymerization reaction in the condensation reaction process.
Further, in step S1, the condensation reaction is performed as follows: and heating the 3, 4-epoxycyclohexylmethyl 3, 4-epoxycyclohexylformate and the double bond-containing anhydride to 65-85 ℃, adding a polymerization inhibitor and an amine accelerator, and continuously heating to 90-115 ℃ for reacting for 4-6 hours.
Further, in the step S2, the mass ratio of the double bond modified epoxy resin to hydroxyethyl acrylate, methacrylic acid, sodium methacrylate and 4-hydroxybutyl acrylate glycidyl ether is 40-60: 15-25: 10-20: 8-15: 5-10.
In step S2, ammonium persulfate is used as an initiator, thioglycollic acid is used as a chain transfer agent, hydroquinone is used as a polymerization inhibitor in the free radical polymerization reaction process, the temperature of the free radical polymerization reaction is controlled to be 60-80 ℃, the initiator is slowly dripped for 60-90 min, the initiator is dripped for 180-240 min after the completion of the polymerization reaction, and sodium hydroxide solution is used for neutralizing to pH 7-8 after the completion of the reaction, so that the alicyclic epoxy modified acrylic emulsion with epoxy groups in the side chains is prepared.
Further, the mass ratio of the initiator, the chain transfer agent, the polymerization inhibitor and the double bond modified epoxy resin is 0.1-0.3: 0.2 to 0.4:0.5 to 1.0: 40-60.
The surface sealing coating can be prepared by simple mechanical stirring, for example, the raw materials of the powder A component are firstly mixed and mechanically stirred uniformly; mixing the raw materials of the component B of the liquid material mechanically and uniformly stirring; and finally, mixing the powder component A and the liquid component B mechanically and uniformly stirring.
Further, the white cement is white silicate cement, the strength grade is 32.5 grade or 42.5 grade, and the whiteness is 2 grade.
Further, the ash cement is ordinary Portland cement, and the strength grade is 42.5.
Further, the specification of the quartz sand is 100-200 meshes.
Further, the particle size of the silica fume powder is 0.1-0.2 mu m. The silica fume powder greatly reduces the pore size in the hydrated slurry, improves the pore size distribution, and can improve the impermeability of cement slurry by filling the pores of cement particles.
Further, the superplasticizer is a polycarboxylic acid high-performance water reducer or a melamine high-efficiency water reducer.
Further, the viscosity modifier is L-rhamnose.
Further, the anti-ubiquity agent is hydroxyl-terminated polymethylphenylsiloxane.
Further, the titanium dioxide content in the titanium dioxide is not less than 91%.
Further, the defoamer is an organosilicon defoamer.
Further, the bactericide is Defres D29A of Hofmann chemical company.
The 3, 4-epoxy cyclohexyl methyl 3, 4-epoxy cyclohexyl formate with high-activity epoxy groups is introduced into a polymer to obtain the alicyclic epoxy modified acrylic emulsion rich in epoxy group side chains, the epoxy groups are high-activity reactive polar groups, can be used for a concrete base surface through physical action or chemical bonding, are provided with six-membered rings, have certain rigidity, can be combined with the polar groups of the concrete interface to form chemical bonds, and can greatly improve the bonding strength and tensile strength of the concrete; 4-hydroxybutyl acrylate glycidyl ether is introduced and is an unsaturated monomer containing an epoxy group, so that the epoxy group content of the synthetic polymer macromolecule can be increased, the bonding strength is improved, and the synthetic polymer macromolecule can be endowed with certain flexibility and the elongation at break is improved due to the existence of an n-butyl chain segment; the sulfonic acid strong polar group is introduced, and can act on the concrete basal plane through physical action or electrostatic combination, and the bonding strength can be improved. The alicyclic epoxy modified acrylic emulsion provided by the invention has the advantages that through the introduction of the components, under the combined action of the epoxy modified acrylic high polymer and cement, the alicyclic epoxy modified acrylic emulsion not only has the rigidity generated after cement hydration, but also has the flexibility generated after polymer film formation, so that the prepared surface sealing coating has the characteristics of excellent adhesive property, good crack resistance, high water resistance, high corrosion resistance and good durability.
The technical scheme of the invention has the beneficial effects that:
the surface sealing coating of the invention prepares the alicyclic epoxy modified acrylic emulsion through the synthesis modification of 3, 4-epoxy cyclohexyl methyl 3, 4-epoxy cyclohexyl formate and 4-hydroxy butyl acrylate glycidyl ether. The 3, 4-epoxy cyclohexyl methyl 3, 4-epoxy cyclohexyl formate contains a rigid six-membered ring, so that the strength can be improved, the 4-hydroxy butyl acrylate glycidyl ether contains a n-butyl chain segment, the flexibility can be improved, the combination of the two provides excellent mechanical properties for the polymer, the tensile strength and the elongation at break are improved, and the surface sealing coating has excellent crack following capability and stops secondary cracking when a crack is sealed at a later stage.
According to the surface sealing coating, the alicyclic epoxy modified acrylic emulsion is introduced, so that the surface sealing coating contains rich epoxy groups, sulfonic acid groups and other strong polar groups, the adhesive force of the coating is improved, and the adhesion between the coating and concrete is firmer.
3) According to the surface sealing coating, the cycloaliphatic epoxy modified acrylic polymer is introduced, so that the flexibility of a polymer chain is remarkably improved, the coating has the characteristic of high elasticity, shrinkage strain can be effectively resisted, and the cracking resistance of the coating is remarkably improved.
4) According to the surface sealing coating, the alicyclic epoxy modified acrylic acid polymer is introduced, and polymer particles are filled in the pores of the coating cement slurry, so that the water channel is blocked, and the anti-permeability and corrosion resistance of the coating are improved.
In a word, the surface sealing coating has the characteristics of excellent adhesive property, good crack resistance, water resistance, strong corrosion resistance and good durability, and is suitable for repairing cracks on the surface of concrete, thereby better protecting the concrete and improving the durability of the concrete.
Detailed Description
The present invention is further illustrated by the following examples, but the scope of the present invention is not limited to the following examples.
In the following specific examples, each raw material was a commercial raw material purchased directly unless otherwise specified.
Example 1
1. Preparation of alicyclic epoxy modified acrylic emulsion:
(1) Adding 40 parts of 3, 4-epoxycyclohexylmethyl 3, 4-epoxycyclohexylformate and 10 parts of maleic anhydride into a reaction kettle, slowly heating to 70 ℃, starting stirring, adding 0.02 part of hydroquinone and 2 parts of hydroxyethyl diethylenetriamine accelerator, continuously heating to 110 ℃, stirring and reacting for 4 hours under the action of the accelerator and a polymerization inhibitor at 110 ℃, and cooling to 40 ℃ to prepare unsaturated epoxy resin;
(2) Mixing the obtained unsaturated epoxy resin serving as an active monomer with 20 parts of hydroxyethyl acrylate, 12 parts of methacrylic acid, 8 parts of sodium methacrylate and 10 parts of 4-hydroxybutyl acrylate glycidyl ether, taking 20 parts of an aqueous solution of ammonium persulfate with the mass fraction of 1% as an initiator, 0.3 part of thioglycollic acid as a chain transfer agent and 0.5 part of hydroquinone as a polymerization inhibitor, performing polymerization reaction at 60 ℃, dropwise adding the initiator at 80min, and performing constant-temperature polymerization reaction for 180min;
(3) After the completion of the reaction, 2 parts by mass of a 30% sodium hydroxide solution was used to neutralize to ph=7 to 8, thereby obtaining a polymer emulsion having an epoxy group in the side chain.
2. Preparation of a surface sealing coating:
step one, preparing a powder A component: 20 parts of white cement, 25 parts of gray cement, 44 parts of quartz sand, 4 parts of silica fume powder, 1.4 parts of polycarboxylic acid high-performance water reducer, 0.2 part of L-rhamnose, 0.4 part of hydroxyl-terminated polymethylphenylsiloxane and 5 parts of titanium dioxide, and mechanically stirring and uniformly mixing the raw materials;
step two, preparing a liquid material B component: adding 80 parts of alicyclic epoxy modified acrylic emulsion, 0.5 part of bactericide and 0.5 part of defoamer into 19 parts of deionized water, and mechanically stirring uniformly at 400 r/min;
and thirdly, adding 100 parts of powder material A into 60 parts of liquid material B, and mechanically stirring for 3 minutes to obtain the surface sealing coating.
Example 2
1. Preparation of alicyclic epoxy modified acrylic emulsion:
(1) 50 parts of 3, 4-epoxycyclohexylmethyl 3, 4-epoxycyclohexylformate and 5 parts of maleic anhydride are put into a reaction kettle, the temperature is slowly raised to 70 ℃, stirring is started, 0.02 part of hydroquinone and 2 parts of hydroxyethyl diethylenetriamine accelerator are put into the kettle, the temperature is continuously raised to 110 ℃, stirring reaction is carried out for 4 hours under the conditions of 110 ℃ under the action of the accelerator and a polymerization inhibitor, and then the temperature is reduced to 40 ℃ to prepare unsaturated epoxy resin;
(2) Mixing the obtained unsaturated epoxy resin serving as an active monomer with 15 parts of hydroxyethyl acrylate, 10 parts of methacrylic acid, 15 parts of sodium methacrylate and 5 parts of 4-hydroxybutyl acrylate glycidyl ether, taking 20 parts of ammonium persulfate aqueous solution with the mass fraction of 1% as an initiator, 0.3 part of thioglycollic acid as a chain transfer agent and 0.5 part of hydroquinone as a polymerization inhibitor, performing polymerization reaction at 60 ℃, dropwise adding the initiator at 80min, and performing constant-temperature polymerization reaction for 180min;
(3) After the completion of the reaction, 2 parts by mass of a 30% sodium hydroxide solution was used to neutralize to ph=7 to 8, thereby obtaining a polymer emulsion having an epoxy group in the side chain.
2. Preparation of a surface sealing coating:
step one, preparing a powder A component: 35 parts of white cement, 10 parts of ash cement, 44 parts of quartz sand, 4 parts of silica fume powder, 1.4 parts of polycarboxylic acid high-performance water reducer, 0.2 part of L-rhamnose, 0.4 part of hydroxyl-terminated polymethylphenylsiloxane and 5 parts of titanium dioxide, and mechanically stirring and uniformly mixing the raw materials.
Step two, preparing a liquid material B component: 80 parts of alicyclic epoxy modified acrylic emulsion, 0.5 part of bactericide and 0.5 part of defoamer are added into 19 parts of deionized water, and the mixture is mechanically stirred uniformly at 400 r/min.
And thirdly, adding 100 parts of powder material A into 60 parts of liquid material B, and mechanically stirring for 3 minutes to obtain the surface sealing coating.
Example 3
1. Preparation of alicyclic epoxy modified acrylic emulsion:
(1) Adding 35 parts of 3, 4-epoxycyclohexylmethyl 3, 4-epoxycyclohexylformate and 15 parts of maleic anhydride into a reaction kettle, slowly heating to 70 ℃, starting stirring, adding 0.02 part of hydroquinone and 1 part of hydroxyethyl diethylenetriamine accelerator, continuously heating to 110 ℃, stirring and reacting for 4 hours under the action of the accelerator and a polymerization inhibitor at 110 ℃, and cooling to 40 ℃ to prepare unsaturated epoxy resin;
(2) Mixing the obtained unsaturated epoxy resin serving as an active monomer with 15 parts of hydroxyethyl acrylate, 14 parts of methacrylic acid, 12 parts of sodium methacrylate and 9 parts of 4-hydroxybutyl acrylate glycidyl ether, taking 20 parts of ammonium persulfate aqueous solution with the mass fraction of 1% as an initiator, 0.3 part of thioglycollic acid as a chain transfer agent and 0.5 part of hydroquinone as a polymerization inhibitor, performing polymerization reaction at 60 ℃, dropwise adding the initiator at 80min, and performing constant-temperature polymerization reaction for 180min;
(3) After the completion of the reaction, 2 parts by mass of a 30% sodium hydroxide solution was used to neutralize to ph=7 to 8, thereby obtaining a polymer emulsion having an epoxy group in the side chain.
2. Preparation of a surface sealing coating:
step one, preparing a powder A component: 10 parts of white cement, 35 parts of ash cement, 40 parts of quartz sand, 8 parts of silica fume powder, 1.4 parts of polycarboxylic acid high-performance water reducer, 0.2 part of L-rhamnose, 0.4 part of hydroxyl-terminated polymethylphenylsiloxane and 5 parts of titanium dioxide, and mechanically stirring and uniformly mixing the raw materials.
Step two, preparing a liquid material B component: 80 parts of alicyclic epoxy modified acrylic emulsion, 0.5 part of bactericide and 0.5 part of defoamer are added into 19 parts of deionized water, and the mixture is mechanically stirred uniformly at 400 r/min.
And thirdly, adding 100 parts of powder material A into 70 parts of liquid material B, and mechanically stirring for 3 minutes to obtain the high-elasticity surface sealing coating.
Comparative example 1
This comparative example differs from example 1 in that 3, 4-epoxycyclohexylmethyl 3, 4-epoxycyclohexylformate is absent. Specifically, the method comprises the following steps:
1. preparation of acrylic emulsion:
(1) 50 parts of maleic anhydride is put into a reaction kettle, the temperature is slowly raised to 70 ℃, stirring is started, and the maleic anhydride is fully dissolved;
(2) Mixing unsaturated maleic anhydride monomer with 20 parts of hydroxyethyl acrylate, 12 parts of methacrylic acid, 8 parts of sodium methacrylate and 10 parts of 4-hydroxybutyl acrylate glycidyl ether, using 20 parts of an aqueous solution of ammonium persulfate with the mass fraction of 1% as an initiator, 0.3 part of thioglycollic acid as a chain transfer agent and 0.5 part of hydroquinone as a polymerization inhibitor, carrying out polymerization reaction at 60 ℃, dropwise adding the initiator at 80min, and carrying out constant-temperature polymerization reaction for 180min;
(3) After the completion of the reaction, 2 parts by mass of a 30% sodium hydroxide solution was used to neutralize to ph=7 to 8, thereby obtaining a polymer emulsion having no epoxy group in the side chain.
2. Preparation of a surface sealing coating:
step one, preparing a powder A component: 20 parts of white cement, 25 parts of ash cement, 44 parts of quartz sand, 4 parts of silica fume powder, 1.4 parts of polycarboxylic acid high-performance water reducer, 0.2 part of L-rhamnose, 0.4 part of hydroxyl-terminated polymethylphenylsiloxane and 5 parts of titanium dioxide, and mechanically stirring and uniformly mixing the raw materials.
Step two, preparing a liquid material B component: 80 parts of acrylic emulsion, 0.5 part of bactericide and 0.5 part of defoamer are added into 19 parts of deionized water, and the mixture is mechanically stirred uniformly at 400 r/min.
And thirdly, adding 100 parts of powder material A into 60 parts of liquid material B, and mechanically stirring for 3 minutes to obtain the surface sealing coating.
Comparative example 2
This comparative example differs from example 1 in that an E44 epoxy resin was used. Specifically, the method comprises the following steps:
1. preparation of epoxy modified acrylic emulsion:
(1) Adding 40 parts of E44 epoxy resin and 10 parts of maleic anhydride into a reaction kettle, slowly heating to 70 ℃, starting stirring, adding 0.02 part of hydroquinone and 2 parts of hydroxyethyl diethylenetriamine accelerator, continuously heating to 110 ℃, stirring and reacting for 4 hours at 110 ℃ under the action of the accelerator and a polymerization inhibitor, and then cooling to 40 ℃ to prepare unsaturated epoxy resin;
(2) Mixing the obtained unsaturated epoxy resin serving as an active monomer with 20 parts of hydroxyethyl acrylate, 12 parts of methacrylic acid, 8 parts of sodium methacrylate and 10 parts of 4-hydroxybutyl acrylate glycidyl ether, taking 20 parts of an aqueous solution of ammonium persulfate with the mass fraction of 1% as an initiator, 0.3 part of thioglycollic acid as a chain transfer agent and 0.5 part of hydroquinone as a polymerization inhibitor, performing polymerization reaction at 60 ℃, dropwise adding the initiator at 80min, and performing constant-temperature polymerization reaction for 180min;
(3) After the completion of the reaction, 2 parts by mass of a 30% sodium hydroxide solution was used to neutralize to ph=7 to 8, thereby obtaining a polymer emulsion having an epoxy group in the side chain.
2. Preparation of a surface sealing coating:
step one, preparing a powder A component: 20 parts of white cement, 25 parts of ash cement, 44 parts of quartz sand, 4 parts of silica fume powder, 1.4 parts of polycarboxylic acid high-performance water reducer, 0.2 part of L-rhamnose, 0.4 part of hydroxyl-terminated polymethylphenylsiloxane and 5 parts of titanium dioxide, and mechanically stirring and uniformly mixing the raw materials.
Step two, preparing a liquid material B component: 80 parts of epoxy modified acrylic emulsion, 0.5 part of bactericide and 0.5 part of defoamer are added into 19 parts of deionized water, and the mixture is mechanically stirred uniformly at 400 r/min.
And thirdly, adding 100 parts of powder material A into 60 parts of liquid material B, and mechanically stirring for 3 minutes to obtain the surface sealing coating.
Comparative example 3
This comparative example differs from example 1 in that it does not contain sodium methallyl sulfonate. Specifically, the method comprises the following steps:
1. preparation of alicyclic epoxy modified acrylic emulsion:
(1) Adding 40 parts of 3, 4-epoxycyclohexylmethyl 3, 4-epoxycyclohexylformate and 10 parts of maleic anhydride into a reaction kettle, slowly heating to 70 ℃, starting stirring, adding 0.02 part of hydroquinone and 2 parts of hydroxyethyl diethylenetriamine accelerator, continuously heating to 110 ℃, stirring and reacting for 4 hours under the action of the accelerator and a polymerization inhibitor at 110 ℃, and cooling to 40 ℃ to prepare unsaturated epoxy resin;
(2) Mixing the obtained unsaturated epoxy resin serving as an active monomer with 20 parts of hydroxyethyl acrylate, 12 parts of methacrylic acid and 10 parts of 4-hydroxybutyl acrylate glycidyl ether, taking 20 parts of ammonium persulfate aqueous solution with the mass fraction of 1% as an initiator, 0.3 part of thioglycollic acid as a chain transfer agent and 0.5 part of hydroquinone as a polymerization inhibitor, performing polymerization reaction at 60 ℃, dropwise adding the initiator at 80min, and performing constant-temperature polymerization reaction for 180min;
(3) After the completion of the reaction, 2 parts by mass of a 30% sodium hydroxide solution was used to neutralize to ph=7 to 8, thereby obtaining a polymer emulsion having an epoxy group in the side chain.
2. Preparation of a surface sealing coating:
step one, preparing a powder A component: 20 parts of white cement, 25 parts of ash cement, 44 parts of quartz sand, 4 parts of silica fume powder, 1.4 parts of polycarboxylic acid high-performance water reducer, 0.2 part of L-rhamnose, 0.4 part of hydroxyl-terminated polymethylphenylsiloxane and 5 parts of titanium dioxide, and mechanically stirring and uniformly mixing the raw materials.
Step two, preparing a liquid material B component: 80 parts of alicyclic epoxy modified acrylic emulsion, 0.5 part of bactericide and 0.5 part of defoamer are added into 19 parts of deionized water, and the mixture is mechanically stirred uniformly at 400 r/min.
And thirdly, adding 100 parts of powder material A into 60 parts of liquid material B, and mechanically stirring for 3 minutes to obtain the high-elasticity surface sealing coating.
Comparative example 4
This comparative example differs from example 1 in that it does not contain 4-hydroxybutyl acrylate glycidyl ether. Specifically, the method comprises the following steps:
1. preparation of alicyclic epoxy modified acrylic emulsion:
(1) Adding 40 parts of 3, 4-epoxycyclohexylmethyl 3, 4-epoxycyclohexylformate and 10 parts of maleic anhydride into a reaction kettle, slowly heating to 70 ℃, starting stirring, adding 0.02 part of hydroquinone and 2 parts of hydroxyethyl diethylenetriamine accelerator, continuously heating to 110 ℃, stirring and reacting for 4 hours under the action of the accelerator and a polymerization inhibitor at 110 ℃, and cooling to 40 ℃ to prepare unsaturated epoxy resin;
(2) Mixing the obtained unsaturated epoxy resin serving as an active monomer with 20 parts of hydroxyethyl acrylate, 12 parts of methacrylic acid and 8 parts of sodium methacrylate sulfonate, taking 20 parts of ammonium persulfate aqueous solution with the mass fraction of 1% as an initiator, 0.3 part of thioglycollic acid as a chain transfer agent and 0.5 part of hydroquinone as a polymerization inhibitor, performing polymerization reaction at 60 ℃, dropwise adding the initiator at 80min, and performing constant-temperature polymerization reaction for 180min;
(3) After the completion of the reaction, 2 parts by mass of a 30% sodium hydroxide solution was used to neutralize to ph=7 to 8, thereby obtaining a polymer emulsion having an epoxy group in the side chain.
2. Preparation of a surface sealing coating:
step one, preparing a powder A component: 20 parts of white cement, 25 parts of ash cement, 44 parts of quartz sand, 4 parts of silica fume powder, 1.4 parts of polycarboxylic acid high-performance water reducer, 0.2 part of L-rhamnose, 0.4 part of hydroxyl-terminated polymethylphenylsiloxane and 5 parts of titanium dioxide, and mechanically stirring and uniformly mixing the raw materials.
Step two, preparing a liquid material B component: 80 parts of alicyclic epoxy modified acrylic emulsion, 0.5 part of bactericide and 0.5 part of defoamer are added into 19 parts of deionized water, and the mixture is mechanically stirred uniformly at 400 r/min.
And thirdly, adding 100 parts of powder material A into 60 parts of liquid material B, and mechanically stirring for 3 minutes to obtain the surface sealing coating.
During construction, the powder material A component and the liquid material B component are uniformly stirred according to a proportion and then used, and the test is carried out according to the technical requirements and methods of the surface sealing coating material for repairing concrete cracks in TG/GW115-2012 of the line maintenance rule of ballastless track of high-speed railway, and the detection results of various performances are shown in Table 1.
Table 1 results of performance tests for each of examples and comparative examples
The results show that the examples 1, 2 and 3 have good mechanical properties, particularly excellent bonding strength, good elongation at break, good cracking resistance, no cracks and deformation after artificial weathering and good durability.
Comparative example 1 does not contain epoxy resin, and the adhesive strength is greatly reduced, indicating that the epoxy resin has a significant effect on adhesive properties.
Comparative example 2 was modified with aromatic epoxy resin containing benzene ring, which had good adhesive strength but low elongation at break and cracks after artificial weathering, indicating that the epoxy resin containing benzene ring was advantageous for adhesive properties, but had rigidity, so that the flexibility of the polymer was deteriorated and the aging resistance was low.
The bond strength of comparative example 3 was somewhat lowered, indicating that the introduction of sulfonic acid groups can improve the proper bond strength.
The lower bond strength and elongation at break of comparative example 4 compared to example 1 indicates that the reduction of epoxy groups reduces bond strength, and because the 4-hydroxybutyl acrylate glycidyl ether molecular chain has n-butyl segments, it has some flexibility, while the 3, 4-epoxycyclohexylmethyl 3, 4-epoxycyclohexylformate has some rigidity, and when two epoxy monomers work together, it has better flexibility and bond strength, and better effect.
Claims (8)
1. The surface sealing coating for repairing the concrete cracks is characterized by comprising a powder component A and a liquid component B:
the powder A comprises the following components in parts by weight:
10-45 parts of white cement;
10-35 parts of ash cement;
30-45 parts of quartz sand;
4-15 parts of silica fume powder;
0.1-2 parts of superplasticizer;
0.1-0.3 part of viscosity modifier;
0.3-0.5 part of anti-alkali flashing agent;
4-10 parts of titanium dioxide;
the liquid material B comprises the following components in parts by weight:
50-94 parts of alicyclic epoxy modified acrylic emulsion;
5-48 parts of deionized water;
0.2-0.5 parts of bactericide;
0.5-2 parts of defoaming agent;
the mass ratio of the powder material A component to the liquid material B component is 100: 50-70 parts;
the preparation method of the alicyclic epoxy modified acrylic emulsion comprises the following steps:
s1, performing condensation reaction on 3, 4-epoxy cyclohexylmethyl 3, 4-epoxy cyclohexylformate and double-bond-containing anhydride under the action of a polymerization inhibitor and an amine accelerator to obtain double-bond-modified epoxy resin;
s2, mixing double bond modified epoxy resin with hydroxyethyl acrylate, methacrylic acid, sodium methacrylate sulfonate and 4-hydroxybutyl acrylate glycidyl ether, and carrying out free radical polymerization under the action of an initiator, a chain transfer agent and a polymerization inhibitor to obtain the alicyclic epoxy modified acrylic emulsion.
2. The surface sealing coating according to claim 1, wherein in the step S1, the double bond-containing anhydride is maleic anhydride, and the mass ratio of the 3, 4-epoxycyclohexylmethyl 3, 4-epoxycyclohexylformate to the double bond-containing anhydride is 35-50: 5-15.
3. The surface sealing coating according to claim 1, wherein in the step S1, the amine accelerator is hydroxyethyl diethylenetriamine, the polymerization inhibitor is hydroquinone, and the mass ratio of the amine accelerator, the polymerization inhibitor and the 3, 4-epoxycyclohexylmethyl 3, 4-epoxycyclohexylformate is 1-5: 0.01 to 0.03: 35-50.
4. The surface blocking coating according to claim 1, wherein in step S1, the condensation reaction is performed by: and heating the 3, 4-epoxycyclohexylmethyl 3, 4-epoxycyclohexylformate and the double bond-containing anhydride to 65-85 ℃, adding a polymerization inhibitor and an amine accelerator, and continuously heating to 90-115 ℃ for reacting for 4-6 hours.
5. The surface sealing coating according to claim 1, wherein in the step S2, the mass ratio of the double bond modified epoxy resin to hydroxyethyl acrylate, methacrylic acid, sodium methacrylate and 4-hydroxybutyl acrylate glycidyl ether is 40-60: 15-25: 10-20: 8-15: 5-10.
6. The surface sealing coating according to claim 1, wherein in the step S2, ammonium persulfate is used as an initiator, thioglycollic acid is used as a chain transfer agent, hydroquinone is used as a polymerization inhibitor, the temperature of the free radical polymerization reaction is controlled to be 60-80 ℃, the initiator is slowly dripped for 60-90 min, after the dripping of the initiator is completed, the polymerization reaction is carried out for 180-240 min, and after the completion of the reaction, sodium hydroxide solution is used for neutralizing to pH 7-8, so that the alicyclic epoxy modified acrylic emulsion with epoxy groups on the side chains is prepared.
7. The surface sealing coating according to claim 1, wherein the mass ratio of the initiator, the chain transfer agent, the polymerization inhibitor and the double bond modified epoxy resin is 0.1-0.3: 0.2 to 0.4:0.5 to 1.0: 40-60.
8. The surface sealer coating according to claim 1, wherein the white cement is white portland cement, has a strength grade of 32.5 or 42.5, and has a whiteness of 2;
the ash cement is ordinary silicate cement, and the strength grade is 42.5 grade;
the specification of the quartz sand is 100-200 meshes;
the particle size of the silica fume powder is 0.1-0.2 mu m;
the superplasticizer is a polycarboxylic acid high-performance water reducer or a melamine high-efficiency water reducer;
the viscosity modifier is L-rhamnose;
the anti-ubiquity agent is hydroxyl-terminated polymethylphenylsiloxane;
the titanium dioxide content in the titanium dioxide is not less than 91%.
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