CN116655313A - Cement self-leveling mortar and preparation method thereof - Google Patents
Cement self-leveling mortar and preparation method thereof Download PDFInfo
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- CN116655313A CN116655313A CN202310202037.1A CN202310202037A CN116655313A CN 116655313 A CN116655313 A CN 116655313A CN 202310202037 A CN202310202037 A CN 202310202037A CN 116655313 A CN116655313 A CN 116655313A
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- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 48
- 239000004568 cement Substances 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 67
- 239000000463 material Substances 0.000 claims abstract description 31
- 239000006185 dispersion Substances 0.000 claims abstract description 28
- 239000000843 powder Substances 0.000 claims abstract description 28
- 239000004593 Epoxy Substances 0.000 claims abstract description 26
- 239000000945 filler Substances 0.000 claims abstract description 23
- 230000001737 promoting effect Effects 0.000 claims abstract description 17
- 238000005056 compaction Methods 0.000 claims abstract description 15
- 239000000853 adhesive Substances 0.000 claims abstract description 14
- 230000001070 adhesive effect Effects 0.000 claims abstract description 14
- 239000004848 polyfunctional curative Substances 0.000 claims abstract description 12
- 239000003469 silicate cement Substances 0.000 claims abstract description 12
- 239000003292 glue Substances 0.000 claims abstract description 11
- 239000013530 defoamer Substances 0.000 claims abstract description 5
- 239000011083 cement mortar Substances 0.000 claims abstract description 4
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 42
- 238000003756 stirring Methods 0.000 claims description 37
- 238000002156 mixing Methods 0.000 claims description 33
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims description 30
- 238000006243 chemical reaction Methods 0.000 claims description 26
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 21
- KZMGYPLQYOPHEL-UHFFFAOYSA-N Boron trifluoride etherate Chemical compound FB(F)F.CCOCC KZMGYPLQYOPHEL-UHFFFAOYSA-N 0.000 claims description 20
- SOGAXMICEFXMKE-UHFFFAOYSA-N Butylmethacrylate Chemical compound CCCCOC(=O)C(C)=C SOGAXMICEFXMKE-UHFFFAOYSA-N 0.000 claims description 20
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 18
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 18
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 claims description 16
- 239000010881 fly ash Substances 0.000 claims description 14
- 229910021487 silica fume Inorganic materials 0.000 claims description 14
- 239000011159 matrix material Substances 0.000 claims description 13
- 239000002131 composite material Substances 0.000 claims description 12
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 11
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 11
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 11
- ZBCBWPMODOFKDW-UHFFFAOYSA-N diethanolamine Chemical compound OCCNCCO ZBCBWPMODOFKDW-UHFFFAOYSA-N 0.000 claims description 11
- LRWZZZWJMFNZIK-UHFFFAOYSA-N 2-chloro-3-methyloxirane Chemical compound CC1OC1Cl LRWZZZWJMFNZIK-UHFFFAOYSA-N 0.000 claims description 10
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 10
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 10
- 230000035484 reaction time Effects 0.000 claims description 10
- 238000010992 reflux Methods 0.000 claims description 10
- LFRDHGNFBLIJIY-UHFFFAOYSA-N trimethoxy(prop-2-enyl)silane Chemical compound CO[Si](OC)(OC)CC=C LFRDHGNFBLIJIY-UHFFFAOYSA-N 0.000 claims description 10
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 9
- 239000002518 antifoaming agent Substances 0.000 claims description 8
- 125000005395 methacrylic acid group Chemical group 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 238000002390 rotary evaporation Methods 0.000 claims description 7
- 238000005406 washing Methods 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 238000007580 dry-mixing Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 238000009775 high-speed stirring Methods 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 5
- 238000010947 wet-dispersion method Methods 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 239000000758 substrate Substances 0.000 claims description 4
- BRLQWZUYTZBJKN-UHFFFAOYSA-N Epichlorohydrin Chemical compound ClCC1CO1 BRLQWZUYTZBJKN-UHFFFAOYSA-N 0.000 claims description 3
- 238000001556 precipitation Methods 0.000 claims 1
- 238000000967 suction filtration Methods 0.000 claims 1
- 239000002994 raw material Substances 0.000 abstract description 13
- 238000005336 cracking Methods 0.000 abstract description 3
- 238000006703 hydration reaction Methods 0.000 abstract description 3
- 239000004925 Acrylic resin Substances 0.000 abstract description 2
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical group [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 abstract description 2
- 239000004566 building material Substances 0.000 abstract description 2
- 230000036571 hydration Effects 0.000 abstract description 2
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 239000013049 sediment Substances 0.000 description 14
- 239000004567 concrete Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000002585 base Substances 0.000 description 4
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 239000008367 deionised water Substances 0.000 description 4
- 229910021641 deionized water Inorganic materials 0.000 description 4
- 238000007865 diluting Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 150000007942 carboxylates Chemical class 0.000 description 3
- 125000003700 epoxy group Chemical group 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- 230000000977 initiatory effect Effects 0.000 description 3
- 238000010907 mechanical stirring Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- 238000010025 steaming Methods 0.000 description 3
- 239000011398 Portland cement Substances 0.000 description 2
- 150000001412 amines Chemical class 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 238000010526 radical polymerization reaction Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 125000005373 siloxane group Chemical group [SiH2](O*)* 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000007259 addition reaction Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000006735 epoxidation reaction Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- -1 methacryloyl alcohol Chemical compound 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 125000004368 propenyl group Chemical group C(=CC)* 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000000979 retarding effect Effects 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
- C08F230/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing phosphorus, selenium, tellurium or a metal
- C08F230/04—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing phosphorus, selenium, tellurium or a metal containing a metal
- C08F230/08—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing phosphorus, selenium, tellurium or a metal containing a metal containing silicon
- C08F230/085—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing phosphorus, selenium, tellurium or a metal containing a metal containing silicon the monomer being a polymerisable silane, e.g. (meth)acryloyloxy trialkoxy silanes or vinyl trialkoxysilanes
-
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/40—Compounds containing silicon, titanium or zirconium or other organo-metallic compounds; Organo-clays; Organo-inorganic complexes
- C04B24/42—Organo-silicon compounds
-
- 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
- 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
- C08F216/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical
- C08F216/02—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical by an alcohol radical
- C08F216/04—Acyclic compounds
- C08F216/08—Allyl alcohol
-
- 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
- C08F8/00—Chemical modification by after-treatment
- C08F8/08—Epoxidation
-
- 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
- C04B2111/60—Flooring materials
- C04B2111/62—Self-levelling compositions
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention relates to cement self-leveling mortar and a preparation method thereof, and belongs to the technical field of building materials. The mortar comprises the following components in parts by weight: 45-55 parts of silicate cement clinker, 120-150 parts of continuous graded fine aggregate, 18-24 parts of compaction promoting filler, 15-25 parts of aqueous epoxy dispersion glue, 3-4 parts of hardener, 1-3 parts of defoamer and 37-45 parts of water; the aqueous epoxy dispersion adhesive is a modified polyacrylic resin with low molecular weight, has good surface quality after film formation, and silane groups on side chains of the aqueous epoxy dispersion adhesive are easy to crosslink with aggregate in an alkaline environment of cement to form an organic-inorganic crosslinked network, so that the strength is far higher than that of the existing cement mortar, and the problems of dent cracking and the like are not easy to occur; the compaction promoting filler takes ultra-micro powder as a raw material, and has an alcohol amine structure grafted on the surface, so that the compaction promoting filler is easy to disperse in a cement material to play a role in promoting hydration, and the mortar has a certain early-stage shape-keeping capability.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to cement self-leveling mortar and a preparation method thereof.
Background
Cement is a powdery hydraulic inorganic cementing material, and is slurry after being added with water and stirred, and can harden under the air and water conditions and firmly bond sand, stone and other materials together. For a long time, cement is taken as an important cementing material and is widely applied to civil construction, water conservancy, national defense and other projects. The traditional cement mortar mainly uses fine sand stones as aggregate, increases the water consumption to obtain finer surface quality, has low strength after solidification, and is generally used for leveling building surfaces or used as a bonding base layer, such as wall surface painting base, ceramic tile paving base layer and the like; for large-area open spaces such as warehouses, industrial plants, production workshops and underground garages, surface decoration is not needed generally, and self-leveling mortar is developed in view of larger construction surface, and a certain proportion of leveling assisting materials and retarding aids are added into the mortar to obtain good early-stage fluidity, and good surface quality can be obtained by assisting in paving in the construction process.
The existing self-leveling mortar is mainly added with redispersible rubber powder and retarder, can meet the requirement of conventional ground pavement, but has low strength, and is easy to cause problems of pressure bearing depression, cracking and the like, has long service life and is easy to cause secondary cracks at repairing parts, particularly in environments such as warehouses, production workshops and industrial workshops.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention aims to provide cement self-leveling mortar and a preparation method thereof.
The aim of the invention can be achieved by the following technical scheme:
the cement self-leveling mortar comprises the following components in parts by weight:
45-55 parts of silicate cement clinker, 120-150 parts of continuous graded fine aggregate, 18-24 parts of compaction promoting filler, 15-25 parts of aqueous epoxy dispersion glue, 3-4 parts of hardener, 1-3 parts of defoamer and 37-45 parts of water;
the aqueous epoxy dispersion adhesive is prepared by the following method:
step A1: uniformly mixing acrylic acid, butyl methacrylate, allyl trimethoxy silane and methacrylic alcohol, then adding acetone solution of azodiisobutyronitrile, uniformly mixing and diluting, mechanically stirring at 120-160rpm, heating to 52-58 ℃ for reflux reaction for 35-42min, adding sodium hydroxide solution for mixing and washing after the reaction is finished, and removing solvent and water by reduced pressure rotary evaporation to prepare a modified matrix;
the preparation method comprises the steps of (1) carrying out free radical polymerization on raw materials containing double bonds such as acrylic acid and the like under the initiation of azodiisobutyronitrile, wherein the obtained polymer contains active hydroxyl groups, carboxyl groups and siloxane groups on side chains, quenching the polymerization reaction through sodium hydroxide solution, controlling the polymerization degree, neutralizing the carboxyl groups on the side chains to form carboxylate, endowing the polymer with certain water dispersibility, destroying the double-electric-layer structure of cement micro powder in the preparation process of mortar, and increasing the mixing property of the mortar;
further, the ratio of the amounts of acrylic acid, butyl methacrylate, allyltrimethoxysilane and methacryloyl alcohol to azobisisobutyronitrile is 0.1 to 0.15mol:0.1 to 0.2mol:0.18-0.22:0.2-0.3mol:9-12g.
Step A2: mixing the modified matrix, tetrahydrofuran and potassium hydroxide, mechanically stirring at 180-240rpm, heating to 70-75 ℃ for reflux, slowly adding epoxy chloropropane, controlling the overall addition reaction time to be 4-5h, filtering while hot after reaction to remove potassium hydroxide, and removing tetrahydrofuran by rotary evaporation to prepare the aqueous epoxy dispersion adhesive;
epoxy chloropropane reacts with hydroxyl on a polymer chain of a modified matrix under an alkaline condition, so that the modified matrix is subjected to epoxidation modification, the curing activity of the dispersion adhesive is improved, and the epoxy chloropropane and an amine hardener can generate crosslinking curing at normal temperature, thereby being beneficial to simplifying construction;
further, the usage ratio of the modified matrix, the epichlorohydrin and the potassium hydroxide is 10g:1.2-1.5mL:0.7-0.8g.
Further, the hardener is selected from polyetheramine hardeners.
The compaction promoting filler is prepared by the following method:
step B1: dispersing fly ash and silica fume in water, adding sodium carbonate to dissolve and adjust the pH value to 8.5-9.0, adding a silane coupling agent KH560, heating to 40-50 ℃ and stirring for 1-2h, standing for 12h, taking the bottom layer to precipitate and dehydrating to prepare coupled composite powder;
further, the dosage ratio of the fly ash, the silica fume and the silane coupling agent KH560 is 10g:2-3g:1.5-2mL.
Step B2: mixing the coupling composite powder, diethanolamine, triethylamine and ethanol solution, slowly adding boron trifluoride diethyl etherate solution at a constant temperature of 38-45 ℃ under high-speed stirring, controlling the overall adding reaction time to be 3-4h, standing after the reaction is finished, taking a bottom sediment, washing the sediment with deionized water, and drying to prepare a compacting-promoting filler;
further, the dosage ratio of the coupling composite powder, the diethanolamine, the triethylamine and the boron trifluoride diethyl etherate solution is 10g:1-1.5g:0.8-1mL:0.1-0.2mL.
A preparation method of cement self-leveling mortar comprises the following steps:
step S1: dry-mixing silicate cement clinker, continuous grading fine aggregate and compaction promoting filler to obtain powder, stirring and mixing water-based epoxy dispersion glue, a defoaming agent and 3/4 mass of water at a high speed to obtain a water material a, and uniformly mixing a hardening agent and the balance of water to obtain a water material b;
step S2: and (3) stirring the powder and the water material a at a high speed to obtain wet dispersion particles, then adding the water material b at a constant speed under low-speed stirring, and stirring to obtain flowing mortar, thus obtaining the cement self-leveling mortar.
The invention has the beneficial effects that:
the self-made aqueous epoxy dispersion adhesive is added into mortar, a base adhesive material with side chains containing functional hydroxyl groups, carboxyl groups and siloxane groups is polymerized by initiation of a raw material containing propenyl groups, the carboxyl groups of the side chains are neutralized by sodium hydroxide to form carboxylate, good water dispersibility is reserved, then the carboxylate is modified by epichlorohydrin, active epoxy groups are introduced, and the cross-linking and solidification can be generated at normal temperature with an amine hardener; the water-based epoxy dispersion adhesive is a low molecular weight polyacrylic resin, the crosslinked film layer has good surface quality and alkali resistance, and is suitable for indoor floor pavement, silane groups on side chains of the water-based epoxy dispersion adhesive are easy to crosslink with aggregates in an alkaline environment of cement to form an organic-inorganic crosslinked network, the strength is far higher than that of the existing cement mortar, and the problems of dent cracking and the like are difficult to occur;
in order to compensate the influence of a large amount of organic colloid materials on the early hydration reaction of mortar, the invention takes the fly ash and the silica fume with ultrastructural structures as raw materials, treats the grafted epoxy group by a silane coupling agent KH560, and modifies the grafted epoxy group by diethanolamine to form an alcohol amine structure on the surface, so that the modified epoxy resin is easy to disperse in cement materials to play a role in promoting hydration, and a certain early-stage shape-retaining capacity is obtained.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1: the concrete process for preparing the cement self-leveling mortar is as follows:
1) Preparation of aqueous epoxy Dispersion gum
a1, taking acrylic acid, butyl methacrylate, allyl trimethoxy silane and methacrylic alcohol, mixing uniformly, taking acetone which is 1.5 times of the raw materials, adding azo-diisobutyronitrile, stirring and dissolving, mixing and diluting the solution, mechanically stirring at 160rpm, heating to 58 ℃ for reflux reaction for 35min, and carrying out free radical polymerization under the initiation of azo-diisobutyronitrile, wherein the dosage ratio of the acrylic acid, the butyl methacrylate, the allyl trimethoxy silane to the methacrylic alcohol to the azo-diisobutyronitrile is 0.15mol:0.1mol:0.22:0.2mol:9g, adding 0.1mol/L sodium hydroxide solution for shuffling after the reaction is finished, wherein the dosage is 8% of the mass of the reaction solution, and then decompressing and steaming to quickly remove the solvent and the water to prepare a modified matrix;
a2, taking a modified substrate and tetrahydrofuran according to the weight ratio of 1:1.5, adding potassium hydroxide, mixing, mechanically stirring at 240rpm, heating to 75 ℃ for reflux, slowly adding epoxy chloropropane in 2 hours, continuing to carry out heat preservation reaction after adding, and controlling the overall adding reaction time to be 4 hours, wherein the dosage ratio of the modified matrix to the epoxy chloropropane to the potassium hydroxide is 10g:1.2mL:0.7g, filtering to remove potassium hydroxide while the mixture is hot after reaction, and removing tetrahydrofuran by rotary evaporation to obtain the aqueous epoxy dispersion adhesive.
2) Preparation of compaction-promoting fillers
b1, taking fly ash and silica fume, stirring and dispersing the fly ash and the silica fume in water with the mass of 5 times, adding sodium carbonate for dissolving and adjusting the pH value to 9.0, then adding a silane coupling agent KH560, heating to 50 ℃ and stirring for 1h, wherein the dosage ratio of the fly ash to the silica fume to the silane coupling agent KH560 is 10g:3g:2mL, standing for 12h, taking the bottom sediment, and removing the sediment in vacuum to prepare coupled composite powder;
b2, preparing an ethanol solution with the volume concentration of 50 percent, wherein the solid-to-liquid ratio is 1:2, adding diethanolamine and triethylamine, mixing, heating to 45 ℃ and keeping constant temperature, adding 600rpm for high-speed stirring, slowly adding boron trifluoride diethyl etherate solution (content is 47%) in 2h, and controlling the overall adding reaction time to be 3h, wherein the dosage ratio of the coupled composite powder, the diethanolamine, the triethylamine and the boron trifluoride diethyl etherate solution is 10g:1.5g:1mL: and (3) 0.2mL, standing to obtain a bottom sediment after the reaction is finished, washing the sediment with deionized water, and drying to prepare the compaction-promoting filler.
3) Preparation of cement self-leveling mortar
s1, preparing raw materials required by cement self-leveling mortar, wherein the following examples adopt the same raw materials, and the concrete steps are as follows:
500g of Portland cement clinker selected from the group consisting of the commercial P.O42.5R Portland cements;
1350g of continuous grading fine aggregate selected from machine-made quartz sand, and the specific grading is shown in table 1:
TABLE 1
| Mesh size/mm | 0.7 | 0.6 | 0.45 | 0.35 | 0.2 | 0.1 |
| Cumulative screen residue/% | 0.00 | 4.20 | 22.15 | 47.25 | 85.60 | 95.85 |
180g of compaction promoting filler, prepared in this example;
250g of aqueous epoxy dispersion glue, prepared in this example;
40g of hardener selected from polyetheramines D230;
10g of an antifoaming agent selected from antifoaming agents F-0141;
450g of water;
s2, dry-mixing silicate cement clinker, continuous graded fine aggregate and compaction promoting filler to obtain powder, stirring and mixing water-based epoxy dispersion glue, a defoaming agent and 3/4 mass of water at a high speed to obtain a water material a, and uniformly mixing a hardening agent and the balance of water to obtain a water material b;
and s3, stirring the powder and the water material a at 400rpm to obtain wet dispersion particles, stirring at 60rpm, adding the water material b at a constant speed, and stirring to obtain flowing mortar, thus obtaining the cement self-leveling mortar.
Example 2: the concrete process for preparing the cement self-leveling mortar is as follows:
1) Preparation of aqueous epoxy Dispersion gum
a1, taking acrylic acid, butyl methacrylate, allyl trimethoxy silane and methacrylic alcohol, mixing uniformly, taking acetone which is 1.2 times of the mass of the raw materials, adding azo-diisobutyronitrile, stirring and dissolving, uniformly mixing and diluting the solution, applying 120rpm mechanical stirring, and heating to 52 ℃ for reflux reaction for 42min, wherein the dosage ratio of the acrylic acid, the butyl methacrylate, the allyl trimethoxy silane to the methacrylic alcohol to the azo-diisobutyronitrile is 0.1mol:0.2mol:0.18:0.3mol:12g, adding 0.1mol/L sodium hydroxide solution for shuffling after the reaction is finished, wherein the dosage is 6.5% of the mass of the reaction solution, and then decompressing and steaming to quickly remove the solvent and the water to prepare a modified matrix;
a2, taking a modified substrate and tetrahydrofuran according to the weight ratio of 1:1.3, adding potassium hydroxide, mixing, mechanically stirring at 180rpm, heating to 70 ℃ for reflux, slowly adding epoxy chloropropane in 3h, continuing to perform heat preservation reaction after adding, and controlling the overall adding reaction time to be 5h, wherein the dosage ratio of the modified matrix to the epoxy chloropropane to the potassium hydroxide is 10g:1.5mL:0.8g, filtering to remove potassium hydroxide while the mixture is hot after reaction, and removing tetrahydrofuran by rotary evaporation to obtain the aqueous epoxy dispersion adhesive.
2) Preparation of compaction-promoting fillers
b1, taking fly ash and silica fume, stirring and dispersing the fly ash and the silica fume in water with the mass of 5 times, adding sodium carbonate for dissolving and adjusting the pH value to 8.5, then adding a silane coupling agent KH560, heating to 40 ℃ and stirring for 2 hours, wherein the dosage ratio of the fly ash to the silica fume to the silane coupling agent KH560 is 10g:2g:1.5mL, standing for 12h, taking the bottom sediment, and removing the sediment in vacuum to prepare coupled composite powder;
b2, preparing an ethanol solution with the volume concentration of 50 percent, wherein the solid-to-liquid ratio is 1:2, adding diethanolamine and triethylamine, mixing, heating to 38 ℃ and keeping constant temperature, adding 600rpm for high-speed stirring, slowly adding boron trifluoride diethyl etherate solution (content is 47%) in 3h, and controlling the overall adding reaction time to be 4h, wherein the dosage ratio of the coupled composite powder, the diethanolamine, the triethylamine and the boron trifluoride diethyl etherate solution is 10g:1g:0.8mL: and (3) 0.1mL, standing to obtain a bottom sediment after the reaction is finished, washing the sediment with deionized water, and drying to prepare the compaction-promoting filler.
3) Preparation of cement self-leveling mortar
s1, preparing raw materials required by cement self-leveling mortar, wherein the following examples adopt the same raw materials, and the concrete steps are as follows:
450g of silicate cement clinker;
1200g of continuous graded fine aggregate;
220g of compaction promoting filler;
150g of aqueous epoxy dispersion glue;
30g of hardener;
30g of defoaming agent;
370g of water;
s2, dry-mixing silicate cement clinker, continuous graded fine aggregate and compaction promoting filler to obtain powder, stirring and mixing water-based epoxy dispersion glue, a defoaming agent and 3/4 mass of water at a high speed to obtain a water material a, and uniformly mixing a hardening agent and the balance of water to obtain a water material b;
and s3, stirring the powder and the water material a at 400rpm to obtain wet dispersion particles, stirring at 60rpm, adding the water material b at a constant speed, and stirring to obtain flowing mortar, thus obtaining the cement self-leveling mortar.
Example 3: the concrete process for preparing the cement self-leveling mortar is as follows:
1) Preparation of aqueous epoxy Dispersion gum
a1, taking acrylic acid, butyl methacrylate, allyl trimethoxy silane and methacrylic alcohol, mixing uniformly, taking acetone which is 1.5 times of the mass of the raw materials, adding azo-bis-isobutyronitrile, stirring and dissolving, uniformly mixing and diluting the solution, applying 160rpm mechanical stirring, heating to 55 ℃ and carrying out reflux reaction for 38min, wherein the dosage ratio of the acrylic acid, the butyl methacrylate, the allyl trimethoxy silane to the methacrylic alcohol to the azo-bis-isobutyronitrile is 0.12mol:0.15mol:0.2:0.25mol:11g, adding 0.1mol/L sodium hydroxide solution for shuffling after the reaction is finished, wherein the dosage is 7% of the mass of the reaction solution, and then decompressing and steaming to quickly remove the solvent and the water to prepare a modified matrix;
a2, taking a modified substrate and tetrahydrofuran according to the weight ratio of 1:1.5 feeding materials, adding potassium hydroxide for mixing, applying 240rpm for mechanical stirring, heating to 72 ℃ for reflux, slowly adding epoxy chloropropane in 2.5h, continuing to carry out heat preservation reaction after adding, and controlling the overall adding reaction time to be 5h, wherein the dosage ratio of the modified matrix to the epoxy chloropropane to the potassium hydroxide is 10g:1.3mL:0.7g, filtering to remove potassium hydroxide while the mixture is hot after reaction, and removing tetrahydrofuran by rotary evaporation to obtain the aqueous epoxy dispersion adhesive.
2) Preparation of compaction-promoting fillers
b1, taking fly ash and silica fume, stirring and dispersing the fly ash and the silica fume in water with the mass of 5 times, adding sodium carbonate for dissolving and adjusting the pH value to 8.5, then adding a silane coupling agent KH560, heating to 45 ℃ and stirring for 1.5h, wherein the dosage ratio of the fly ash to the silica fume to the silane coupling agent KH560 is 10g:2.2g:1.8mL, standing for 12h, taking the bottom sediment, and removing the sediment in vacuum to prepare coupled composite powder;
b2, preparing an ethanol solution with the volume concentration of 50 percent, wherein the solid-to-liquid ratio is 1:2, adding diethanolamine and triethylamine, mixing, heating to 42 ℃ and keeping constant temperature, adding 600rpm for high-speed stirring, slowly adding boron trifluoride diethyl etherate solution (content is 47%) in 2h, and controlling the overall adding reaction time to be 4h, wherein the dosage ratio of the coupled composite powder, the diethanolamine, the triethylamine and the boron trifluoride diethyl etherate solution is 10g:1.3g:0.9mL: and (3) 0.12mL, standing to obtain a bottom sediment after the reaction is finished, washing the sediment with deionized water, and drying to prepare the compaction-promoting filler.
3) Preparation of cement self-leveling mortar
s1, preparing raw materials required by cement self-leveling mortar, wherein the following examples adopt the same raw materials, and the concrete steps are as follows:
550g of silicate cement clinker;
1500g of continuous graded fine aggregate;
240g of compaction promoting filler;
190g of aqueous epoxy dispersion glue;
32g of hardener;
20g of defoamer;
420g of water;
s2, dry-mixing silicate cement clinker, continuous graded fine aggregate and compaction promoting filler to obtain powder, stirring and mixing water-based epoxy dispersion glue, a defoaming agent and 3/4 mass of water at a high speed to obtain a water material a, and uniformly mixing a hardening agent and the balance of water to obtain a water material b;
and s3, stirring the powder and the water material a at 400rpm to obtain wet dispersion particles, stirring at 60rpm, adding the water material b at a constant speed, and stirring to obtain flowing mortar, thus obtaining the cement self-leveling mortar.
Comparative example: the concrete formula of the existing indoor ground self-leveling mortar is as follows: 500g of silicate cement clinker, 1350g of continuous grading fine aggregate, 85g of redispersible rubber powder (model: CW-7070), 25g of retarder (model TD-CN), 30g of defoamer, 35g of water reducer (PC-303) and 480g of water;
the concrete slurry mixing method comprises the following steps: the silicate cement clinker, the continuous grading fine aggregate, the redispersible rubber powder, the retarder and the water reducer are premixed uniformly, then the water and the redispersible rubber powder are stirred and dispersed, and then the dispersion liquid is added into the mixed powder to be stirred uniformly, thus the self-leveling mortar can be prepared.
Taking self-leveling mortar provided in examples 1-3 and comparative examples, performing mortar performance test according to JC/T985-2017 standard, performing glossiness detection by referring to GB/T13891-2008 standard after 7d curing, wherein specific test data are shown in Table 2:
TABLE 2
As shown in the data of Table 1, the mortar prepared by the invention has good initial fluidity, good self-leveling property, shrinkage rate of only 0.02-0.03%, 60-degree glossiness of more than 18.2, good surface quality and compression and bending strength obviously superior to that of the existing self-leveling mortar.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is merely illustrative and explanatory of the invention, as various modifications and additions may be made to the particular embodiments described, or in a similar manner, by those skilled in the art, without departing from the scope of the invention or exceeding the scope of the invention as defined in the claims.
Claims (8)
1. The self-leveling cement mortar is characterized by comprising the following components in parts by weight:
45-55 parts of silicate cement clinker, 120-150 parts of continuous graded fine aggregate, 18-24 parts of compaction promoting filler, 15-25 parts of aqueous epoxy dispersion glue, 3-4 parts of hardener, 1-3 parts of defoamer and 37-45 parts of water;
the aqueous epoxy dispersion adhesive is prepared by the following method:
step A1: uniformly mixing acrylic acid, butyl methacrylate, allyl trimethoxy silane and methacrylic alcohol, adding an acetone solution of azodiisobutyronitrile, stirring and heating to 52-58 ℃ for reflux reaction for 35-42min, adding a sodium hydroxide solution for mixing after the reaction, and performing rotary evaporation under reduced pressure to prepare a modified matrix;
step A2: mixing the modified matrix, tetrahydrofuran and potassium hydroxide, stirring and heating to 70-75 ℃ for reflux, slowly adding epoxy chloropropane, controlling the overall adding reaction time to be 4-5h, and carrying out suction filtration and rotary evaporation while the reaction is hot to prepare the water-based epoxy dispersion adhesive.
2. The cement self-leveling mortar of claim 1, wherein the ratio of acrylic acid, butyl methacrylate, allyltrimethoxysilane, and methacrylol to azobisisobutyronitrile is 0.1 to 0.15mol:0.1 to 0.2mol:0.18-0.22:0.2-0.3mol:9-12g.
3. A cement self-leveling mortar in accordance with claim 2 wherein the modified substrate, epichlorohydrin and potassium hydroxide are used in an amount ratio of 10g:1.2-1.5mL:0.7-0.8g.
4. A cement self-leveling mortar in accordance with claim 3 wherein the hardener is a polyetheramine hardener.
5. A cementitious self-leveling mortar in accordance with claim 1 wherein said compaction promoting filler is prepared by the process of:
step B1: dispersing fly ash and silica fume in water, adding sodium carbonate to adjust the pH value to 8.5-9.0, adding a silane coupling agent KH560, heating to 40-50 ℃, stirring for 1-2h, standing for 12h, taking the bottom layer to precipitate and dehydrating to prepare coupled composite powder;
step B2: mixing the coupling composite powder, diethanolamine, triethylamine and ethanol solution, slowly adding boron trifluoride diethyl etherate solution at a constant temperature of 38-45 ℃ under high-speed stirring, controlling the overall adding reaction time to be 3-4h, standing after the reaction is finished, taking the bottom layer for precipitation, washing and drying to prepare the compaction-promoting filler.
6. The cement self-leveling mortar of claim 5, wherein the ratio of fly ash to silica fume to silane coupling agent KH560 is 10g:2-3g:1.5-2mL.
7. The cement self-leveling mortar of claim 6, wherein the coupling composite powder, diethanolamine, triethylamine and boron trifluoride etherate are used in an amount ratio of 10g:1-1.5g:0.8-1mL:0.1-0.2mL.
8. The method for preparing the cement self-leveling mortar according to claim 1, comprising the following steps:
step S1: dry-mixing silicate cement clinker, continuous grading fine aggregate and compaction promoting filler to obtain powder, mixing water-based epoxy dispersion glue, a defoaming agent and 3/4 mass of water to obtain a water material a, and mixing a hardening agent and the balance of water to obtain a water material b;
step S2: and (3) stirring the powder and the water material a at a high speed to obtain wet dispersion particles, then adding the water material b at a constant speed under low-speed stirring, and stirring to obtain flowing mortar, thus obtaining the cement self-leveling mortar.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102190463A (en) * | 2010-03-05 | 2011-09-21 | 上海耐齐建材有限公司 | Environment friendly color cement-based self-leveling material |
| CN111574096A (en) * | 2020-05-29 | 2020-08-25 | 德州润德混凝土有限公司 | Wet-mixed mortar additive and preparation method thereof |
| CN114349439A (en) * | 2021-12-17 | 2022-04-15 | 科之杰新材料集团(海南)有限公司 | Self-leveling mortar and preparation method thereof |
| CN115651564A (en) * | 2022-12-28 | 2023-01-31 | 海阳市凌晖包装有限公司 | Special pressure-sensitive adhesive for laser cutting protective film and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102190463A (en) * | 2010-03-05 | 2011-09-21 | 上海耐齐建材有限公司 | Environment friendly color cement-based self-leveling material |
| CN111574096A (en) * | 2020-05-29 | 2020-08-25 | 德州润德混凝土有限公司 | Wet-mixed mortar additive and preparation method thereof |
| CN114349439A (en) * | 2021-12-17 | 2022-04-15 | 科之杰新材料集团(海南)有限公司 | Self-leveling mortar and preparation method thereof |
| CN115651564A (en) * | 2022-12-28 | 2023-01-31 | 海阳市凌晖包装有限公司 | Special pressure-sensitive adhesive for laser cutting protective film and preparation method thereof |
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