CN116515047B - Cement waste slurry dispersing agent, preparation method and application thereof - Google Patents
Cement waste slurry dispersing agent, preparation method and application thereof Download PDFInfo
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- CN116515047B CN116515047B CN202310622488.0A CN202310622488A CN116515047B CN 116515047 B CN116515047 B CN 116515047B CN 202310622488 A CN202310622488 A CN 202310622488A CN 116515047 B CN116515047 B CN 116515047B
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- waste slurry
- cement waste
- dispersing agent
- cement
- slurry dispersing
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- 239000004568 cement Substances 0.000 title claims abstract description 64
- 239000002002 slurry Substances 0.000 title claims abstract description 60
- 239000002699 waste material Substances 0.000 title claims abstract description 58
- 239000002270 dispersing agent Substances 0.000 title claims abstract description 42
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000000178 monomer Substances 0.000 claims abstract description 19
- 238000002156 mixing Methods 0.000 claims abstract description 18
- 229920000056 polyoxyethylene ether Polymers 0.000 claims abstract description 15
- 229940051841 polyoxyethylene ether Drugs 0.000 claims abstract description 15
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims abstract description 14
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 14
- UALUSSOHQPEICU-UHFFFAOYSA-N prop-2-enamide;trimethoxy(propyl)silane Chemical compound NC(=O)C=C.CCC[Si](OC)(OC)OC UALUSSOHQPEICU-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000003999 initiator Substances 0.000 claims abstract description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 24
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 18
- 230000007935 neutral effect Effects 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 11
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 9
- 239000007864 aqueous solution Substances 0.000 claims description 9
- KWSLGOVYXMQPPX-UHFFFAOYSA-N 5-[3-(trifluoromethyl)phenyl]-2h-tetrazole Chemical compound FC(F)(F)C1=CC=CC(C2=NNN=N2)=C1 KWSLGOVYXMQPPX-UHFFFAOYSA-N 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 8
- 229910001379 sodium hypophosphite Inorganic materials 0.000 claims description 8
- CPJRRXSHAYUTGL-UHFFFAOYSA-N isopentenyl alcohol Chemical compound CC(=C)CCO CPJRRXSHAYUTGL-UHFFFAOYSA-N 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 1
- QVDTXNVYSHVCGW-ONEGZZNKSA-N isopentenol Chemical compound CC(C)\C=C\O QVDTXNVYSHVCGW-ONEGZZNKSA-N 0.000 abstract description 10
- 239000002202 Polyethylene glycol Substances 0.000 abstract description 7
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 abstract description 7
- 239000000203 mixture Substances 0.000 abstract description 7
- 229920001223 polyethylene glycol Polymers 0.000 abstract description 7
- PNXMTCDJUBJHQJ-UHFFFAOYSA-N propyl prop-2-enoate Chemical compound CCCOC(=O)C=C PNXMTCDJUBJHQJ-UHFFFAOYSA-N 0.000 abstract description 7
- 229910000077 silane Inorganic materials 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 3
- 125000005396 acrylic acid ester group Chemical group 0.000 abstract description 2
- 230000000379 polymerizing effect Effects 0.000 abstract description 2
- -1 polyoxypropylene Polymers 0.000 description 7
- 239000003638 chemical reducing agent Substances 0.000 description 5
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 3
- 239000004721 Polyphenylene oxide Substances 0.000 description 3
- 239000006087 Silane Coupling Agent Substances 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 239000010881 fly ash Substances 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 229920005646 polycarboxylate Polymers 0.000 description 3
- 229920000570 polyether Polymers 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- BYDRTKVGBRTTIT-UHFFFAOYSA-N 2-methylprop-2-en-1-ol Chemical compound CC(=C)CO BYDRTKVGBRTTIT-UHFFFAOYSA-N 0.000 description 2
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 2
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 2
- KFSLWBXXFJQRDL-UHFFFAOYSA-N Peracetic acid Chemical compound CC(=O)OO KFSLWBXXFJQRDL-UHFFFAOYSA-N 0.000 description 2
- 239000012986 chain transfer agent Substances 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 description 1
- DZSVIVLGBJKQAP-UHFFFAOYSA-N 1-(2-methyl-5-propan-2-ylcyclohex-2-en-1-yl)propan-1-one Chemical compound CCC(=O)C1CC(C(C)C)CC=C1C DZSVIVLGBJKQAP-UHFFFAOYSA-N 0.000 description 1
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 description 1
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 description 1
- AGBXYHCHUYARJY-UHFFFAOYSA-N 2-phenylethenesulfonic acid Chemical compound OS(=O)(=O)C=CC1=CC=CC=C1 AGBXYHCHUYARJY-UHFFFAOYSA-N 0.000 description 1
- DKIDEFUBRARXTE-UHFFFAOYSA-N 3-mercaptopropanoic acid Chemical compound OC(=O)CCS DKIDEFUBRARXTE-UHFFFAOYSA-N 0.000 description 1
- XDLMVUHYZWKMMD-UHFFFAOYSA-N 3-trimethoxysilylpropyl 2-methylprop-2-enoate Chemical compound CO[Si](OC)(OC)CCCOC(=O)C(C)=C XDLMVUHYZWKMMD-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- 150000008064 anhydrides Chemical class 0.000 description 1
- 229960005070 ascorbic acid Drugs 0.000 description 1
- 235000010323 ascorbic acid Nutrition 0.000 description 1
- 239000011668 ascorbic acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- BNKAXGCRDYRABM-UHFFFAOYSA-N ethenyl dihydrogen phosphate Chemical compound OP(O)(=O)OC=C BNKAXGCRDYRABM-UHFFFAOYSA-N 0.000 description 1
- FWDBOZPQNFPOLF-UHFFFAOYSA-N ethenyl(triethoxy)silane Chemical compound CCO[Si](OCC)(OCC)C=C FWDBOZPQNFPOLF-UHFFFAOYSA-N 0.000 description 1
- NKSJNEHGWDZZQF-UHFFFAOYSA-N ethenyl(trimethoxy)silane Chemical compound CO[Si](OC)(OC)C=C NKSJNEHGWDZZQF-UHFFFAOYSA-N 0.000 description 1
- GCSJLQSCSDMKTP-UHFFFAOYSA-N ethenyl(trimethyl)silane Chemical compound C[Si](C)(C)C=C GCSJLQSCSDMKTP-UHFFFAOYSA-N 0.000 description 1
- WOXXJEVNDJOOLV-UHFFFAOYSA-N ethenyl-tris(2-methoxyethoxy)silane Chemical compound COCCO[Si](OCCOC)(OCCOC)C=C WOXXJEVNDJOOLV-UHFFFAOYSA-N 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000001530 fumaric acid Substances 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 229920000151 polyglycol Polymers 0.000 description 1
- 239000010695 polyglycol Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920001451 polypropylene glycol Polymers 0.000 description 1
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- RAJUSMULYYBNSJ-UHFFFAOYSA-N prop-1-ene-1-sulfonic acid Chemical compound CC=CS(O)(=O)=O RAJUSMULYYBNSJ-UHFFFAOYSA-N 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- XWGJFPHUCFXLBL-UHFFFAOYSA-M rongalite Chemical compound [Na+].OCS([O-])=O XWGJFPHUCFXLBL-UHFFFAOYSA-M 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- JVBXVOWTABLYPX-UHFFFAOYSA-L sodium dithionite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])=O JVBXVOWTABLYPX-UHFFFAOYSA-L 0.000 description 1
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- CWERGRDVMFNCDR-UHFFFAOYSA-N thioglycolic acid Chemical group OC(=O)CS CWERGRDVMFNCDR-UHFFFAOYSA-N 0.000 description 1
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 description 1
- NLVXSWCKKBEXTG-UHFFFAOYSA-N vinylsulfonic acid Chemical compound OS(=O)(=O)C=C NLVXSWCKKBEXTG-UHFFFAOYSA-N 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000009736 wetting Methods 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
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/06—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals
- C08F283/065—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals on to unsaturated polyethers, polyoxymethylenes or polyacetals
-
- 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
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2688—Copolymers containing at least three different monomers
- C04B24/2694—Copolymers containing at least three different monomers containing polyether side chains
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/40—Surface-active agents, dispersants
- C04B2103/408—Dispersants
-
- 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 discloses a cement waste slurry dispersing agent, a preparation method and application thereof. The invention provides a cement waste slurry dispersing agent, which is prepared by taking isopentenol polyoxyethylene ether as a large monomer, acrylic acid as a small monomer, taking 3-trimethoxy silane propyl acrylate, acrylic acid ester polyethylene glycol silane and acrylamide propyl trimethoxy silane as functional monomers and polymerizing by an initiator; can effectively improve the activity of the cement waste slurry, and solve the problems of rapid loss and reduced concrete strength with time loss caused by the slump reduction of the concrete mixture as mixing water of the cement waste slurry.
Description
Technical Field
The invention relates to the technical field of cement, in particular to a cement waste slurry dispersing agent, a preparation method and application thereof.
Background
In the production process of concrete, a large amount of wastewater is generated by cleaning of mixer trucks, sites and mixers. And (3) precipitating the wastewater to obtain cement waste slurry, wherein the cement waste slurry loses activity after a period of time. When the cement waste slurry is used as mixing water, the slump of concrete is easily reduced, and the loss with time is fast, and the strength of the concrete is easily reduced. At present, the prior art does not develop a cement waste slurry dispersing agent specifically aiming at the characteristics of cement waste slurry to solve the problems.
Chinese patent CN114426408A discloses an oil well cement dispersant, the preparation raw materials of which include unsaturated polyether monomer, unsaturated acid or its salt or its anhydride, silane coupling agent, oxidizing agent, reducing agent and chain transfer agent. At least one of unsaturated polyether monomers such as methallyl alcohol polyoxyethylene ether, methallyl alcohol polyoxypropylene ether, isopentenyl alcohol polyoxyethylene ether and isobutenyl alcohol polyoxyethylene ether; the unsaturated acid is at least one selected from acrylic acid, methacrylic acid, vinylsulfonic acid, vinylphosphoric acid, maleic acid, itaconic acid, fumaric acid, 2-acrylamide-2-methylpropanesulfonic acid, styrenesulfonic acid and propenyl sulfonic acid; the silane coupling agent is at least one selected from vinyl trimethyl silane, vinyl trimethoxy silane, vinyl triethoxy silane, vinyl tri (beta-methoxyethoxy) silane, gamma-aminopropyl triethoxy silane, gamma-glycidoxypropyl trimethoxy silane and gamma-methacryloxypropyl trimethoxy silane; the oxidant is at least one selected from hydrogen peroxide, peracetic acid, ammonium persulfate, sodium persulfate and potassium persulfate; the reducing agent is selected from at least one of ascorbic acid, sodium formaldehyde sulfoxylate and sodium dithionite; the chain transfer agent is selected from thioglycollic acid and/or 3-mercaptopropionic acid. The invention overcomes the defects of low dispersing efficiency, heavy pollution and low temperature resistance of polycarboxylate dispersant of sulfonated aldehyde ketone polycondensate.
Chinese patent CN112250799A discloses an organosilicon modified polycarboxylate dispersant, which is prepared from hydroxycellulose as a raw material by grafting the hydroxycellulose with small-molecule unsaturated carboxylic acid, providing a hydrophilic side chain by using an unsaturated polyether compound, modifying the side chain by using a silane coupling agent to reduce the surface tension of the side chain, and finally obtaining the polycarboxylate dispersant with excellent wetting dispersibility.
Disclosure of Invention
At present, the prior art does not specially aim at the characteristics of cement waste slurry, and develops a cement waste slurry dispersing agent to solve the problems that the cement waste slurry is used as mixing water, the slump of concrete is easy to reduce, the time loss is fast, and the strength of the concrete is easy to reduce.
In order to achieve the aim, the invention provides a cement waste slurry dispersing agent, which is prepared by polymerizing isopentenol polyoxyethylene ether serving as a large monomer, acrylic acid serving as a small monomer and one of 3-trimethoxy silane propyl acrylate, acrylic ester polyethylene glycol silane and acrylamide propyl trimethoxy silane serving as a functional monomer under the action of an initiator. The cement waste slurry dispersing agent can effectively improve the activity of cement waste slurry, and solve the problems of rapid loss and reduced strength of concrete after the slump of concrete mixture is reduced and the concrete strength is reduced caused by using the cement waste slurry as mixing water.
The preparation method of the cement waste slurry dispersing agent comprises the following steps: uniformly mixing 80-120 parts by weight of isopentenyl alcohol polyoxyethylene ether, 4-6 parts by weight of sodium hypophosphite and 40-80 parts by weight of water; dropwise adding or throwing 30-60 parts by weight of initiator, 300-500 parts by weight of acrylic acid and 15-30 parts by weight of functional monomer at 60-65 ℃ under stirring; the dripping or feeding speed is controlled to be simultaneously finished within 2 hours; preserving the heat for 1-3 h after dripping or adding; and cooling to room temperature, and regulating the pH value to be neutral to obtain the cement waste slurry dispersing agent.
Preferably, the initiator is 5-15 wt% ammonium persulfate aqueous solution or 3-30 wt% hydrogen peroxide solution.
Preferably, the functional monomer is any one of 3-trimethoxy silane propyl acrylate, acrylate polyethylene glycol silane and acrylamide propyl trimethoxy silane.
Preferably, adjusting the pH to neutral means adjusting the pH to neutral by 1 to 10wt% aqueous sodium hydroxide solution.
The invention also discloses application of the cement waste slurry dispersing agent in preparing concrete.
The specific application is as follows: adding the cement waste slurry dispersing agent into the cement waste slurry, stirring and mixing uniformly to obtain concrete mixing water; can replace 10 to 60 weight percent of water.
Preferably, the consumption of the cement waste slurry dispersing agent is 0.6-5% of the mass of the cement waste slurry.
The invention has the beneficial effects that:
compared with the prior art, the invention uses the isopentenol polyoxyethylene ether as a large monomer, acrylic acid as a small monomer, and one of 3-trimethoxy silane propyl acrylate, acrylic ester polyethylene glycol silane and acrylamide propyl trimethoxy silane as a functional monomer, and the dispersant for cement waste slurry can be obtained by polymerization under the action of an initiator, so that the problems of rapid loss and strength reduction of concrete mixture slump over time caused by using the cement waste slurry as mixing water can be effectively solved.
Detailed Description
The isopentenyl polyglycol ether has the following molecular structural formula and molecular weight 2400.
3-trimethoxysilane propyl acrylate, molecular structural formula is as follows, CAS:4369-14-6.
The molecular structural formula of the acrylic ester polyethylene glycol silane is shown as follows, and the molecular weight is 3400.
Acrylamide propyl trimethoxysilane has the following molecular structural formula, CAS:57577-95-5.
Comparative example 1
The preparation method of the cement waste slurry dispersing agent comprises the following steps: 100g of isopentenol polyoxyethylene ether, 5g of sodium hypophosphite and 60g of water are put into a four-neck flask and uniformly mixed; the temperature of the water bath is controlled to 63 ℃, 50g of 10wt% ammonium persulfate aqueous solution and 400g of acrylic acid are added dropwise under the condition of stirring; the dripping speed is controlled to be simultaneously and completely within 2 hours; preserving heat for 1.5h after the dripping is finished; cooling to room temperature, and dissolving with 4wt% sodium hydroxide water to adjust the pH value to be neutral to obtain the cement waste slurry dispersing agent.
Example 1
The preparation method of the cement waste slurry dispersing agent comprises the following steps: 100g of isopentenol polyoxyethylene ether, 5g of sodium hypophosphite and 60g of water are put into a four-neck flask and uniformly mixed; the temperature of the water bath is controlled to 63 ℃, 50g of 10wt% ammonium persulfate aqueous solution, 400g of acrylic acid and 20g of 3-trimethoxy silane propyl acrylate are added dropwise under the condition of stirring; the dripping speed is controlled to be simultaneously and completely within 2 hours; preserving heat for 1.5h after the dripping is finished; cooling to room temperature, and dissolving with 4wt% sodium hydroxide water to adjust the pH value to be neutral to obtain the cement waste slurry dispersing agent.
Example 2
The preparation method of the cement waste slurry dispersing agent comprises the following steps: 100g of isopentenol polyoxyethylene ether, 5g of sodium hypophosphite and 60g of water are put into a four-neck flask and uniformly mixed; the temperature of the water bath is controlled to 63 ℃, 50g of 10wt% ammonium persulfate aqueous solution, 400g of acrylic acid and 20g of acrylic acid polyethylene glycol silane are added dropwise under the condition of stirring; the dripping speed is controlled to be simultaneously and completely within 2 hours; preserving heat for 1.5h after the dripping is finished; cooling to room temperature, and dissolving with 4wt% sodium hydroxide water to adjust the pH value to be neutral to obtain the cement waste slurry dispersing agent.
Example 3
The preparation method of the cement waste slurry dispersing agent comprises the following steps: 100g of isopentenol polyoxyethylene ether, 5g of sodium hypophosphite and 60g of water are put into a four-neck flask and uniformly mixed; the temperature of the water bath is controlled to 63 ℃, 50g of 10wt% ammonium persulfate aqueous solution, 400g of acrylic acid and 20g of acrylamide propyl trimethoxy silane are added dropwise under the condition of stirring; the dropping speed and the feeding are controlled to be simultaneously finished within 2 hours; preserving heat for 1.5h after the dripping is finished; cooling to room temperature, and dissolving with 4wt% sodium hydroxide water to adjust the pH value to be neutral to obtain the cement waste slurry dispersing agent.
Example 4
The preparation method of the cement waste slurry dispersing agent comprises the following steps: 80g of isopentenol polyoxyethylene ether, 4g of sodium hypophosphite and 40g of water are put into a four-neck flask and mixed uniformly; the water bath is controlled at 60 ℃, 30g of 10wt% ammonium persulfate aqueous solution, 300g of acrylic acid and 15g of acrylamide propyl trimethoxy silane are added dropwise under the condition of stirring; the dropping speed and the feeding are controlled to be simultaneously finished within 2 hours; preserving heat for 1h after the dripping is finished; cooling to room temperature, and dissolving with 4wt% sodium hydroxide water to adjust the pH value to be neutral to obtain the cement waste slurry dispersing agent.
Example 5
The preparation method of the cement waste slurry dispersing agent comprises the following steps: 120g of isopentenol polyoxyethylene ether, 6g of sodium hypophosphite and 80g of water are put into a four-neck flask and uniformly mixed; the temperature of the water bath is controlled to 65 ℃, 60g of 10wt% ammonium persulfate aqueous solution, 500g of acrylic acid and 30g of acrylamide propyl trimethoxy silane are added dropwise under the condition of stirring; the dropping speed and the feeding are controlled to be simultaneously finished within 2 hours; preserving heat for 3 hours after the dripping is finished; cooling to room temperature, and dissolving with 4wt% sodium hydroxide water to adjust the pH value to be neutral to obtain the cement waste slurry dispersing agent.
Example 6
A preparation method of concrete comprises the following steps: adding the cement waste slurry dispersing agent prepared in the examples 1-6 into cement waste slurry with the addition amount of 2wt percent to obtain cement waste slurry for mixing; uniformly mixing cement, fly ash, mineral powder, fine aggregate, coarse aggregate, a water reducing agent, water and water for mixing; and (3) casting and oxidizing to obtain the concrete.
Test example 1
Introducing water recovered from washing a concrete mixer into a sedimentation tank, naturally settling for 24 hours, and pumping the upper slurry into a slurry storage tank, namely cement waste slurry, wherein the concentration of the cement waste slurry is about 15wt%; adding the cement waste slurry dispersing agent according to the mass ratio of 2%, and uniformly stirring; the cement waste slurry for mixing is obtained.
Table 1 formulation
And (3) cement: 42.5 parts of ordinary Portland cement; fly ash: class II fly ash; mineral powder: s95 grade mineral powder; fine aggregate: natural fine river sand; coarse aggregate: natural crushed stone; water reducing agent: SPC-100 standard type polycarboxylic acid high-performance water reducer.
Uniformly mixing the raw materials according to the formula of Table 1, wherein the slump reference JTG 3420-2020 of the obtained concrete mixture is T0522-2005, cement concrete mixture consistency test method (slump meter method); the test results are shown in Table 2.
Uniformly mixing the raw materials according to the formula of the table 1, and then referring to the standard of a GB/T50081-2022 common concrete mechanical property test method for testing; the test results are shown in Table 2.
TABLE 2
As can be seen from Table 2, the invention uses isopentenol polyoxyethylene ether as a large monomer, acrylic acid as a small monomer, and one of 3-trimethoxy silane propyl acrylate, acrylic acid ester polyethylene glycol silane and acrylamide propyl trimethoxy silane as a functional monomer, and polymerizes under the action of an initiator to obtain the cement waste slurry dispersing agent, so that the problems of rapid slump reduction of concrete mixture and rapid loss and strength reduction of concrete caused by using cement waste slurry as mixing water can be effectively solved. In addition, the cement dispersant obtained by using the acrylamide propyl trimethoxy silane as a functional monomer not only can solve the problem of slump reduction, but also can further improve the compressive strength of concrete.
Claims (6)
1. A preparation method of a cement waste slurry dispersing agent is characterized by comprising the following steps: uniformly mixing 80-120 parts by weight of isopentenyl alcohol polyoxyethylene ether, 4-6 parts by weight of sodium hypophosphite and 40-80 parts by weight of water; simultaneously adding 30 to 60 weight parts of initiator, 300 to 500 weight parts of acrylic acid and 15 to 30 weight parts of functional monomer under the conditions of 60 to 65 ℃ and stirring; the material dropping speed is controlled to be simultaneously finished or finished within 2 hours; preserving the heat for 1-3 h after dripping or adding; cooling to room temperature, and regulating pH to be neutral to obtain the cement waste slurry dispersing agent;
the functional monomer is acrylamide propyl trimethoxy silane;
the initiator is 5-15 wt% ammonium persulfate aqueous solution.
2. The method for preparing the cement waste slurry dispersant according to claim 1, wherein: the pH is adjusted to be neutral by 1 to 10 weight percent of sodium hydroxide aqueous solution.
3. A cement waste slurry dispersant, characterized by being prepared by the method of any one of claims 1 to 2.
4. Use of the cement waste slurry dispersing agent as claimed in claim 3 for preparing concrete.
5. The use according to claim 4, wherein: and (3) adding the cement waste slurry dispersing agent into the cement waste slurry, and uniformly stirring and mixing to obtain the water for mixing the concrete.
6. The use according to claim 5, wherein: the consumption of the cement waste slurry dispersing agent is 0.6-5% of the mass of the cement waste slurry.
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