CN107828027B - Concrete workability regulator with water reducing function and preparation method thereof - Google Patents
Concrete workability regulator with water reducing function and preparation method thereof Download PDFInfo
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- CN107828027B CN107828027B CN201711145151.6A CN201711145151A CN107828027B CN 107828027 B CN107828027 B CN 107828027B CN 201711145151 A CN201711145151 A CN 201711145151A CN 107828027 B CN107828027 B CN 107828027B
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- sulfonate
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 239000004567 concrete Substances 0.000 title claims description 90
- 238000002360 preparation method Methods 0.000 title claims description 11
- 239000011734 sodium Substances 0.000 claims abstract description 26
- 229910052708 sodium Inorganic materials 0.000 claims abstract description 24
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims abstract description 20
- 239000004721 Polyphenylene oxide Substances 0.000 claims abstract description 19
- 229920000570 polyether Polymers 0.000 claims abstract description 19
- 239000003513 alkali Substances 0.000 claims abstract description 9
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 9
- 229920002521 macromolecule Polymers 0.000 claims abstract description 8
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims abstract description 6
- 238000007334 copolymerization reaction Methods 0.000 claims abstract description 5
- 239000000178 monomer Substances 0.000 claims description 47
- 239000003999 initiator Substances 0.000 claims description 24
- 229920000642 polymer Polymers 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 15
- 239000006260 foam Substances 0.000 claims description 14
- 239000012986 chain transfer agent Substances 0.000 claims description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 10
- 239000002202 Polyethylene glycol Substances 0.000 claims description 9
- 229920001223 polyethylene glycol Polymers 0.000 claims description 9
- -1 alkenyl sulfonate Chemical compound 0.000 claims description 8
- 229920001451 polypropylene glycol Polymers 0.000 claims description 8
- 239000012467 final product Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 239000000126 substance Substances 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 4
- PMNLUUOXGOOLSP-UHFFFAOYSA-N 2-mercaptopropanoic acid Chemical compound CC(S)C(O)=O PMNLUUOXGOOLSP-UHFFFAOYSA-N 0.000 claims description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 4
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims description 4
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 4
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- CWERGRDVMFNCDR-UHFFFAOYSA-N thioglycolic acid Chemical compound OC(=O)CS CWERGRDVMFNCDR-UHFFFAOYSA-N 0.000 claims description 4
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 150000003254 radicals Chemical class 0.000 claims description 3
- JWYVGKFDLWWQJX-UHFFFAOYSA-N 1-ethenylazepan-2-one Chemical compound C=CN1CCCCCC1=O JWYVGKFDLWWQJX-UHFFFAOYSA-N 0.000 claims description 2
- KMQWOHBEYVPGQJ-UHFFFAOYSA-N 1-methoxybut-1-ene Chemical compound CCC=COC KMQWOHBEYVPGQJ-UHFFFAOYSA-N 0.000 claims description 2
- 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 claims description 2
- DKIDEFUBRARXTE-UHFFFAOYSA-N 3-mercaptopropanoic acid Chemical compound OC(=O)CCS DKIDEFUBRARXTE-UHFFFAOYSA-N 0.000 claims description 2
- FASUFOTUSHAIHG-UHFFFAOYSA-N 3-methoxyprop-1-ene Chemical compound COCC=C FASUFOTUSHAIHG-UHFFFAOYSA-N 0.000 claims description 2
- ATVJXMYDOSMEPO-UHFFFAOYSA-N 3-prop-2-enoxyprop-1-ene Chemical compound C=CCOCC=C ATVJXMYDOSMEPO-UHFFFAOYSA-N 0.000 claims description 2
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 2
- IAYPIBMASNFSPL-UHFFFAOYSA-N Ethylene oxide Chemical compound C1CO1 IAYPIBMASNFSPL-UHFFFAOYSA-N 0.000 claims description 2
- CNCOEDDPFOAUMB-UHFFFAOYSA-N N-Methylolacrylamide Chemical compound OCNC(=O)C=C CNCOEDDPFOAUMB-UHFFFAOYSA-N 0.000 claims description 2
- GOOHAUXETOMSMM-UHFFFAOYSA-N Propylene oxide Chemical compound CC1CO1 GOOHAUXETOMSMM-UHFFFAOYSA-N 0.000 claims description 2
- ACIAHEMYLLBZOI-ZZXKWVIFSA-N Unsaturated alcohol Chemical compound CC\C(CO)=C/C ACIAHEMYLLBZOI-ZZXKWVIFSA-N 0.000 claims description 2
- QYKIQEUNHZKYBP-UHFFFAOYSA-N Vinyl ether Chemical compound C=COC=C QYKIQEUNHZKYBP-UHFFFAOYSA-N 0.000 claims description 2
- 239000002253 acid Substances 0.000 claims description 2
- 229910001413 alkali metal ion Inorganic materials 0.000 claims description 2
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 2
- 125000003118 aryl group Chemical group 0.000 claims description 2
- 238000007664 blowing Methods 0.000 claims description 2
- WNAHIZMDSQCWRP-UHFFFAOYSA-N dodecane-1-thiol Chemical compound CCCCCCCCCCCCS WNAHIZMDSQCWRP-UHFFFAOYSA-N 0.000 claims description 2
- 125000001301 ethoxy group Chemical group [H]C([H])([H])C([H])([H])O* 0.000 claims description 2
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 claims description 2
- DNJIEGIFACGWOD-UHFFFAOYSA-N ethyl mercaptane Natural products CCS DNJIEGIFACGWOD-UHFFFAOYSA-N 0.000 claims description 2
- ORTRWBYBJVGVQC-UHFFFAOYSA-N hexadecane-1-thiol Chemical compound CCCCCCCCCCCCCCCCS ORTRWBYBJVGVQC-UHFFFAOYSA-N 0.000 claims description 2
- FQPSGWSUVKBHSU-UHFFFAOYSA-N methacrylamide Chemical compound CC(=C)C(N)=O FQPSGWSUVKBHSU-UHFFFAOYSA-N 0.000 claims description 2
- OHLHOLGYGRKZMU-UHFFFAOYSA-N n-benzylprop-2-enamide Chemical compound C=CC(=O)NCC1=CC=CC=C1 OHLHOLGYGRKZMU-UHFFFAOYSA-N 0.000 claims description 2
- RQAKESSLMFZVMC-UHFFFAOYSA-N n-ethenylacetamide Chemical compound CC(=O)NC=C RQAKESSLMFZVMC-UHFFFAOYSA-N 0.000 claims description 2
- ZQXSMRAEXCEDJD-UHFFFAOYSA-N n-ethenylformamide Chemical compound C=CNC=O ZQXSMRAEXCEDJD-UHFFFAOYSA-N 0.000 claims description 2
- SWPMNMYLORDLJE-UHFFFAOYSA-N n-ethylprop-2-enamide Chemical compound CCNC(=O)C=C SWPMNMYLORDLJE-UHFFFAOYSA-N 0.000 claims description 2
- 230000007935 neutral effect Effects 0.000 claims description 2
- 230000003472 neutralizing effect Effects 0.000 claims description 2
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 2
- 125000002572 propoxy group Chemical group [*]OC([H])([H])C(C([H])([H])[H])([H])[H] 0.000 claims description 2
- 239000000376 reactant Substances 0.000 claims description 2
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 claims description 2
- DGVVWUTYPXICAM-UHFFFAOYSA-N β‐Mercaptoethanol Chemical compound OCCS DGVVWUTYPXICAM-UHFFFAOYSA-N 0.000 claims description 2
- WHNWPMSKXPGLAX-UHFFFAOYSA-N N-Vinyl-2-pyrrolidone Chemical compound C=CN1CCCC1=O WHNWPMSKXPGLAX-UHFFFAOYSA-N 0.000 claims 1
- 230000000052 comparative effect Effects 0.000 description 30
- 230000000740 bleeding effect Effects 0.000 description 16
- 239000003638 chemical reducing agent Substances 0.000 description 15
- 239000000243 solution Substances 0.000 description 15
- 230000006870 function Effects 0.000 description 14
- 238000002156 mixing Methods 0.000 description 13
- 230000015572 biosynthetic process Effects 0.000 description 11
- 238000003786 synthesis reaction Methods 0.000 description 11
- 238000005204 segregation Methods 0.000 description 10
- 239000002562 thickening agent Substances 0.000 description 9
- 239000003795 chemical substances by application Substances 0.000 description 8
- 239000004568 cement Substances 0.000 description 7
- 239000000047 product Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000002002 slurry Substances 0.000 description 5
- 239000000654 additive Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 3
- 150000001408 amides Chemical class 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000005227 gel permeation chromatography Methods 0.000 description 3
- 230000002209 hydrophobic effect Effects 0.000 description 3
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 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 2
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229920000056 polyoxyethylene ether Polymers 0.000 description 2
- 229940051841 polyoxyethylene ether Drugs 0.000 description 2
- 125000001844 prenyl group Chemical group [H]C([*])([H])C([H])=C(C([H])([H])[H])C([H])([H])[H] 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 2
- XFTALRAZSCGSKN-UHFFFAOYSA-M sodium;4-ethenylbenzenesulfonate Chemical compound [Na+].[O-]S(=O)(=O)C1=CC=C(C=C)C=C1 XFTALRAZSCGSKN-UHFFFAOYSA-M 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 125000003368 amide group Chemical group 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 125000002843 carboxylic acid group Chemical group 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- LDCRTTXIJACKKU-ARJAWSKDSA-N dimethyl maleate Chemical compound COC(=O)\C=C/C(=O)OC LDCRTTXIJACKKU-ARJAWSKDSA-N 0.000 description 1
- 239000003480 eluent Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000004574 high-performance concrete Substances 0.000 description 1
- 239000011372 high-strength concrete Substances 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 230000015784 hyperosmotic salinity response Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 150000003951 lactams Chemical group 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- YPHQUSNPXDGUHL-UHFFFAOYSA-N n-methylprop-2-enamide Chemical compound CNC(=O)C=C YPHQUSNPXDGUHL-UHFFFAOYSA-N 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920005646 polycarboxylate Polymers 0.000 description 1
- 239000002986 polymer concrete Substances 0.000 description 1
- 230000037048 polymerization activity Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000010526 radical polymerization reaction Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000006254 rheological additive Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 235000010344 sodium nitrate Nutrition 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
- 238000001308 synthesis method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 229920006163 vinyl copolymer Polymers 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- NLVXSWCKKBEXTG-UHFFFAOYSA-N vinylsulfonic acid Chemical compound OS(=O)(=O)C=C NLVXSWCKKBEXTG-UHFFFAOYSA-N 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
- C04B24/16—Sulfur-containing compounds
- C04B24/161—Macromolecular compounds comprising sulfonate or sulfate groups
- C04B24/163—Macromolecular compounds comprising sulfonate or sulfate groups obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/165—Macromolecular compounds comprising sulfonate or sulfate groups obtained by reactions only involving carbon-to-carbon unsaturated bonds containing polyether side chains
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a workability regulator with a water reducing function, which comprises the workability regulator macromolecules and water; the workability adjusting macromolecule is obtained through copolymerization reaction, and the comonomer comprises polymerization active end micro-hydrophobic modified polyether and alpha-alkenyl sodium sulfonate; the workability regulator with the water reducing function can effectively introduce tiny and stable bubbles, and has excellent saline-alkali resistance.
Description
Technical Field
The invention belongs to the technical field of building materials, particularly relates to the technical field of concrete admixtures, and particularly relates to a concrete workability regulator with a water reducing function and a preparation method thereof.
Background
High Performance Concrete (HPC) was formally proposed in 1990 in the united states, and means concrete with high durability, high strength and high fluidity, which is another important progress following high strength concrete, and is the leading direction of the development of concrete today, and one of the important matters is that it requires high workability of fresh concrete. Improving the workability of concrete is the key to improving the workability of fresh concrete. Among the various proposed process theories, the addition of admixtures to improve concrete mix workability is considered to be a simple, effective and feasible process.
It is well known that there are three major types of admixtures that are now used to improve the workability of concrete mixtures: water reducing agent, air entraining agent and thickening agent. The water reducing agent is a concrete admixture which can reduce the water consumption for mixing on the premise of maintaining the slump constant of concrete. The air entraining agent is an additive which leads air to be introduced into a concrete mixture in the mixing process to form a large amount of tiny, closed and stable bubbles, the tiny bubbles are similar to balls, have the functions of wetting and dispersing, can improve the workability of the concrete, effectively reduce the bleeding of fresh concrete and avoid segregation. Thickeners improve the workability of concrete while reducing its fluidity (increasing yield stress and plastic viscosity) by a combination of mechanisms of action, mainly attributable to water retention, interactions and entanglements between the polymer molecules and interactions between the polymer and the cement particles.
At present, the problem of workability is difficult to solve fundamentally by using a certain additive alone, and in practical application, a plurality of additives are mainly used in a combined way, such as a water reducing agent and an air entraining agent, or the water reducing agent and a thickening agent or the water reducing agent, the air entraining agent and the thickening agent.
Patent CN201410208936.3 discloses "carboxylic acid vinyl copolymer concrete thickener and preparation method thereof". According to the preparation method, a polyether macromonomer, dimethyl maleate, hydroxyethyl acrylate and styrene are used as comonomers, the carboxylic vinyl polymer concrete thickener is obtained by a one-step method and one-time feeding, the workability of concrete can be effectively improved, and the wrapping property of the concrete thickener is improved.
Patent GB2380504B adopts 2-acrylamide-2-methylpropanesulfonic acid, maleic anhydride and unsaturated polyether macromonomer or (methyl) acrylate as comonomers to prepare a polymer water retention agent based on vinyl sulfonic acid, and the workability of the polymer is improved by utilizing the water retention effect, but the maleic anhydride used in the patent has lower polymerization activity, and the homopolymer of the 2-acrylamide-2-methylpropanesulfonic acid is easily obtained, so that the stability of the obtained polymer is poor in the environment of high salt and high alkali of concrete.
Patent CN201310749293.9 discloses a water reducing agent with concrete workability adjusting function and a synthesis method thereof. The patent adopts prenyl polyoxyethylene ether, acrylic acid or methacrylic acid or a mixture of the prenyl polyoxyethylene ether and the acrylic acid or the methacrylic acid, maleic anhydride, sodium p-styrene sulfonate and sodium methallyl sulfonate as comonomers to prepare the water reducer with the workability regulation function. The water reducer has the water retention capacity, has the function of reducing the surface tension of concrete so as not to influence the viscosity and the fluidity of the concrete, and can also ensure the normal coagulation and the strength development of the concrete, but the salt tolerance of two monomers, namely sodium p-styrene sulfonate and sodium methyl propylene sulfonate, introduced into the water reducer is poor, and the stability of a polymer is easy to reduce when the water reducer is used in a high-salt environment of the concrete, so that the performance of the water reducer is influenced.
Disclosure of Invention
The invention provides a concrete workability regulator which can effectively introduce tiny and stable bubbles, has excellent saline-alkali resistance and has a water reducing function, and a preparation method thereof, aiming at the problems that the existing thickening agent is sensitive in doping amount, easily causes over-high slurry viscosity and poor fluidity, the existing air entraining agent has reduced strength due to improper introduced bubble structure, the existing water reducing agent has limited workability regulating effect due to molecular structure difference, the existing multifunctional water reducing agent has poor saline-alkali resistance and the like.
On the premise of not influencing the strength of concrete, the invention can introduce a large amount of tiny, closed and stable bubbles into the concrete and has certain slurry collecting capacity, thereby achieving the purpose of improving the workability of the concrete.
The concrete workability regulator with the water reducing function comprises the workability regulating macromolecules and water.
The workability adjusting macromolecule is obtained through copolymerization reaction, and the comonomer comprises polymerization active end micro-hydrophobic modified polyether and alpha-alkenyl sodium sulfonate.
The structure of the polymerization active end micro-hydrophobic modified polyether is as follows: the polyether chain segment is connected to-O-of the unsaturated alcohol, the propoxy structure unit is connected firstly, and then the ethoxy structure unit is connected, so that a hydrophobic-hydrophilic structure is formed. The molecular weight of the polymeric active end micro-hydrophobic modified polyether is 500-3000.
The structural characteristics of the alpha-sodium alkenyl sulfonate are as follows: one end is a C ═ C double bond, and the other end is-SO3Na with an intermediate of-CH2-；
One of the structural formulas of the alpha-alkenyl sodium sulfonate is as follows:
wherein n represents an integer of 6-14, and the value of n is too large or too small, which influences the foam size, distribution and foam stability of the final product introduced with bubbles.
The structural formula of the polymerized active end micro-hydrophobic modified polyether is as follows:
wherein x represents an integer of 0 to 4, p is an average molar number of propylene oxide added and is an integer of 1 to 12, q is an average molar number of ethylene oxide added and is an integer of 10 to 65, R5Represents a hydrogen atom, a methyl group or an ethyl group.
The P value is too small, the hydrophilicity is strong, and the air entraining capacity of the final product is influenced; too large a p value, strong hydrophobicity, affects the dispersion properties of the final product. Too large or too small a molecular weight affects the dispersion properties of the final product.
Preferably, the polymeric active end micro-hydrophobic modified polyether is one of polypropylene glycol polyethylene glycol vinyl ether, polypropylene glycol polyethylene glycol allyl ether, polypropylene glycol polyethylene glycol methyl allyl ether and polypropylene glycol polyethylene glycol methyl butenyl ether, and the monomer C preferably has a molecular weight of 500-3000.
Preferably, the sodium alpha-alkenyl sulfonate is one of sodium alpha-alkenyl octyl sulfonate, sodium alpha-alkenyl nonyl sulfonate, sodium alpha-alkenyl decyl sulfonate, sodium alpha-alkenyl undecyl sulfonate or sodium mid-alpha-alkenyl dodecyl sulfonate.
The concrete workability regulator with the water reducing function is prepared by carrying out free radical copolymerization on a monomer A, a monomer B, a monomer C and a monomer D under neutral regulation, wherein the molar ratio of the components A to B to C to D is 1.0: 0.5-2.0: 0.2-0.5: 0.3-1.5
The monomer A is a substance represented by the general formula (1):
The monomer B is a substance represented by the general formula (2a), (2B) or (2 c):
wherein R is1Having the meaning described in formula (1); r2、R3Independently of one another are hydrogen atoms or C1-to C4Alkyl of (a) or C1-to C4Hydroxyalkyl of or C5-to C8Cycloalkyl of (A) or (C)6-to C14-an aryl group.
Wherein R is1Having the meaning described in formula (1); r4Represents a hydrogen atom or C1-to C4Alkyl of-or-COOM1Wherein M is1Having the meaning described in formula (1); m represents an integer of 1 to 3.
Wherein R is1And R2Have the meanings indicated in the formulae (1) and (2a), respectively.
The monomer C is the polymerized active end micro-hydrophobic modified polyether;
the monomer D is the alpha-alkenyl sodium sulfonate.
The molecular weight of the concrete workability regulator with the water reducing function is 3 multiplied by 104～12×104。
Preferably, the monomer a is acrylic acid or methacrylic acid.
Preferably, the monomer B is one of acrylamide, methacrylamide, N-methylacrylamide, N-ethylacrylamide, N-dimethylacrylamide, N-methylolacrylamide, N-dicyclohexylacrylamide, N-benzylacrylamide, N-vinylcaprolactam, N-vinylpyradone, N-vinylformamide and N-vinylacetamide.
The carboxylic acid group of the adsorption monomer A represented by the structural formula (1) provides adsorption points in the copolymer, so that the copolymer is easily adsorbed on the surface of cement particles to form an adsorption double electric layer, the attraction force among the cement particles is changed into electric repulsion, the network agglomeration among the cement particles is effectively prevented and destroyed, and the cement is fully dispersed.
The amido or lactam group of the amide monomer represented by the structural formula (2) regulates the rigidity and flexibility of the molecule. The steric hindrance group of the polymer is used for limiting the free rotation of the main chain of the polymer, the rigidity and flexibility of a molecular chain are regulated and controlled, and the stability of polymer molecules under high temperature and saline-alkali conditions is improved.
The polymerization active end hydrophobic modified unsaturated polyether macromonomer represented by the structural formula (3) is necessary, and not only can provide a steric hindrance effect, so that the polymer can play a dispersing role in a fresh concrete mixing stage, but also the air entraining capability of the polymer can be effectively improved by proper length and hydrophilicity and hydrophobicity.
The sodium a-olefin sulfonate represented by the structural formula (4) is essential. The applicant researches and discovers that a correlation rule exists between the foam stability and the concrete workability of the surfactant, namely, the better the foam stability is, the better the concrete workability is. The alpha-sodium alkenyl sulfonate is a surfactant with moderate air-entraining capacity and excellent foam stability, and can be used as a comonomer to be introduced into a polymer to effectively improve the foam stability of the polymer.
The invention relates to a preparation method of a concrete workability regulator with a water reducing function, which comprises the following steps:
(1) adding a monomer A, a monomer B, a monomer C, a monomer D and deionized water into a reactor provided with a thermometer, a stirrer, a dropping funnel and a nitrogen inlet pipe, and neutralizing the mixture by using 32% of liquid alkali solution until the pH value is 7-8;
(2) starting stirring, blowing the reactor with nitrogen while stirring, and heating to 50 ℃;
(3) preparing an initiator into a solution with the mass concentration of 1.0-2.0%, preparing a chain transfer agent into a solution with the mass concentration of 5.0-10.0%, slowly dripping the prepared initiator and the prepared chain transfer agent solution into a reactor within 2h and 2.5h respectively, after dripping is finished, heating to 70-80 ℃, and continuously reacting for 4-6 h at the temperature to obtain a polymer with the solid content of 25-35%, namely the concrete workability regulator macromolecule.
The initiator is selected from water-soluble azo initiators or persulfate initiators; the water-soluble azo initiator is selected from one of azobisisobutylamidine hydrochloride, azobisisobutylimidazoline hydrochloride, azobiscyanovaleric acid and azobisisopropylimidazoline; the persulfate initiator is selected from one of sodium persulfate, potassium persulfate and ammonium persulfate.
The dosage of the initiator accounts for 0.5 to 2.0 percent of the total weight of the reactants A, B, C and D. The initiator with excessive dosage can initiate more free radicals, so that the reaction rate is accelerated, and the molecular weight of the product is reduced; if the amount of the initiator is too small, the reaction rate becomes slow, and the polymerization is even stopped.
The dropping time of the initiator solution is 2 hours, and the solvent of the initiator solution is water. The concentration of the aqueous initiator solution is not critical, and it is sufficient to control the completion of the dropping within a given time. The dripping speed is slower when the concentration is high, and is faster when the concentration is low, the solution amount is less when the concentration is too high, and the dripping speed is difficult to control, so that the concentration is controlled to be 1.0-2.0%.
The weight average molecular weight of the concrete workability regulator with the water reducing function prepared by the invention is controlled to be 3 multiplied by 104～12×104In between, too large or too small a molecular weight, workability adjustment and water-reducing property are affected. The invention effectively controls the molecular weight of the polymer by using the chain transfer agent, and the chain transfer agent suitable for the invention can be one or two of dodecanethiol, hexadecanethiol, mercaptoethanol, mercaptoacetic acid, 2-mercaptopropionic acid and 3-mercaptopropionic acid or more chain transfer agents in combination with any proportion. The dosage of the chain transfer agent is 2.5 to 5.0 percent of the total mole number of the monomers (A + B + C + D).
In the invention, the dropping time of the chain transfer agent solution is 2.5h, and the solvent of the chain transfer agent solution is water. The concentration of the aqueous solution of the chain transfer agent is not critical, and it is sufficient to control the completion of the dropping within a given time. The dripping speed is slower when the concentration is high, and is faster when the concentration is low, the solution amount is less when the concentration is too high, and the dripping speed is difficult to control, so that the concentration is controlled to be 5.0-10.0%.
In the invention, the free radical polymerization reaction is selected to react for 4-6 h at 70-80 ℃, and the reaction temperature is determined by the decomposition temperature of the initiator. Either too high or too low of a temperature can change the half-life of the initiator, affect the rate of polymerization and the relative molecular weight of the polymer product, and thereby change the overall properties of the polymer product.
The invention controls the molecular weight of the polymer A to be 3 multiplied by 10 by reasonably controlling the components and the proportion of the synthetic raw materials and the synthetic conditions4～12×104The concrete workability regulator with the water reducing function prepared under the molecular weight has the following beneficial effects:
(1) the workability regulator provided by the invention can introduce a large amount of tiny, closed and stable bubbles into the concrete and has certain slurry collecting capacity on the premise of not influencing the concrete strength, thereby achieving the purpose of improving the concrete workability.
(2) The invention introduces the polymerization active end hydrophobic modified polyether, which not only can provide steric hindrance effect, but also effectively improves the air entraining capability of the invention through proper length and hydrophilic and hydrophobic properties; the invention also introduces alpha-sodium alkenyl sulfonate to improve the foam stability of the invention.
(3) The amide monomer is introduced, so that the salt and alkali resistance is improved, and the pulp-collecting capacity of the invention is ensured to be certain.
(4) The optimal mixing amount of the invention is 0.1-0.3 percent of the using amount of the glue material, the water reducing rate is more than 25 percent, the workability of the fresh concrete can be effectively improved, and the invention is not isolated, bleeding or settlement and is a functional building chemical additive.
Detailed Description
The invention will be further illustrated with reference to specific embodiments. The following examples describe in more detail the preparation of the polymer product according to the process of the invention and are given by way of illustration and are intended to enable one skilled in the art to understand the contents of the invention and to carry out the invention, without limiting the scope of the invention in any way. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
In the synthetic examples of the present invention, the molecular weight of the rheology modifier was measured using aqueous Gel Permeation Chromatography (GPC). The measurement conditions were as follows:
gel column: shodex SB806+803 two chromatographic columns in series
Eluent: 0.1M NaNO3 solution
Velocity of mobile phase: 1.0ml/min
And (3) injection: 20 μ l of a 0.5% aqueous solution
A detector: shodex RI-71 type differential refractive detector
Standard substance: polyethylene glycol GPC standard (Sigma-Aldrich, molecular weight 263000, 118000, 44700, 18600, 6690, 1960, 628, 232)
The raw materials in the synthetic examples of the present invention were purchased from Shanghai Aladdin Biotech GmbH.
Table 1 raw materials and symbols used in the synthetic examples
Synthesis example 1
36g of A-1, 17.8g of B-1, 54.2g of C-1, 40.5g of D-2 and 62.2g of deionized water were placed in a glass reactor equipped with a thermometer, stirrer, dropping funnel, nitrogen inlet and reflux condenser, and the solution was neutralized with 62.5g of liquid alkali to a pH of 7 to 8. The stirring was started, the reactor was purged with nitrogen while stirring, and the temperature was raised to 50 ℃ and 0.7g of initiator I was addeda-1And 10.1g of chain transfer agent K-1 are prepared into solutions with mass concentrations of 2.0% and 5.0% respectively, then the solutions are slowly dripped into the reactor within 2 hours and 2.5 hours respectively, after the dripping is finished, the temperature is raised to 70-80 ℃, and the reaction is continued for 4-6 hours at the temperature, so that the target product with the solid content of 35% is obtained.
Synthesis examples 2 to 16
Synthesis examples 2 to 16 of the present invention were prepared according to the procedure of Synthesis example 1, and fed in the proportions described in tables 2 and 3.
Synthesis comparative examples 1 to 2
Synthetic comparative examples 1 to 2 of the present invention were prepared according to the procedure of synthetic example 1, and fed in the proportions described in tables 2 and 3.
TABLE 2 feed proportions for the preparation of the synthesis examples
TABLE 2
TABLE 3 preparation of synthetic examples the amounts of monomers, the molecular weights and the solids contents of the products
In the application embodiment of the invention, the adopted cement is 52.5 R.P.II cement in a small open field unless particularly specified; the mineral powder is S95 grade, and the specific surface area is 520m2Kg, activity index 96%; the fly ash is first-grade fly ash, and the water demand ratio is 96%; specific surface area of silicon ash 18000m2Per kg; the sand is river sand, the sand in the 2 areas has fineness modulus of 2.6; the stones are limestone with 5-20mm continuous gradation; the water reducing agent is a polycarboxylate water reducing agent PCA I self-made by Jiangsu Subot new materials GmbH. In the experiment, the slump constant and the change of the slump constant with the lapse of time are carried out according to the method in GB/T8076-2008 'concrete admixture' 6.5.1; the water reduction rate is calculated by the method in GB/T8076-20086.5.2; the bleeding rate ratio is calculated by referring to the method in GB 8076-20086.5.3; the gas content and the change of the gas content with time are carried out according to the method in GB/T8076-20086.6.1; the compressive strength is carried out according to the method described in GB/T50081-2002 Standard for testing mechanical properties of ordinary concrete 6. T is50The expansion speed means the time taken for the concrete to reach an expansion diameter of 50cm from the start of lifting the slump cone in the measurement of the slump, and this speed can reflect the apparent viscosity of the concrete to some extent.
Application example 1
Comparative example 1 is a composite of anionic air entraining agent sodium dodecyl sulfate (K12) and PCA I, K12 is purchased from Nanjing Kannier science and technology Limited, and the mixing amount of the PCA I is 1 percent of the using amount of the cementing material; comparative example 2 is a compound of a commercially available high molecular polymer thickener, which is available from Yangzi BASF corporation, and PCA I, which is 1% of the amount of the binder; comparative examples 3, 4 and 5 were prepared from A-1, B-2, C-4, A-1, B-2, D-2, A-1, C-4 and D-2, respectively, in the same amounts as in Synthesis example 11.
Table 4 shows the water reducing rate of synthetic examples 1-16 at the same mixing amount, the reference concrete mixing ratio refers to GB/T8076-2008, and the mixing amount (converted into solid) of the examples is 0.12% of the using amount of the cementing material.
Table 4 examples 1-16 water reduction rates
Tables 5 and 6 show the performance (0 and 60min extension, 0 and 60min air content, 0 and 60min bleeding rate, T) of synthetic examples 1 to 16 and comparative examples 1 to 5 in low-cementitious concrete50And 28d compressive strength) the reference concrete was 1.0% PCAI-doped concrete. The initial fluidity of the concrete was made comparable in the experiment by adjusting the blending amounts of the synthetic examples 1 to 16.
TABLE 5 concrete mix proportions
TABLE 6 influence of Synthesis examples 1 to 16 and comparative examples 1 to 5 on various properties of low-cementitious concrete
Application example 3
The mixing amount of PCA I in the comparative example 1 is 2.0 percent of the using amount of the cementing material; in comparative example 2, the mixing amount of PCA I is 2.0 percent of the using amount of the cementing material; comparative examples 3, 4 and 5 were prepared from A-1, B-2, C-4, A-1, B-2, D-2, A-1, C-4 and D-2, respectively, in the same amounts as in Synthesis example 11.
Tables 7 and 8 show the performance (0 and 60min extension, 0 and 60min air content, 0 and 60min bleeding rate, T) of the synthetic examples 1 to 16 and the comparative examples 1 to 5 in the high-cementitious concrete50And 28d compressive strength), the initial fluidity of the concrete was made comparable in the experiment by adjusting the blending amounts of the synthetic examples 1 to 16.
TABLE 7 concrete mixing ratio
TABLE 8 influence of Synthesis examples 1 to 16 and comparative examples 1 to 5 on various properties of high cementitious concrete
The data in tables 4 and 6 show that the concrete workability regulator with the water reducing function, prepared by the invention, has good dispersibility and can effectively improve the segregation and bleeding phenomena of the concrete. Examples 1-16 the initial gas content and 1h gas content of the obtained product for concrete varied, bleeding rate and T50Are slightly different, but are obviously better than the synthesis of comparative examples 1-2 and comparative examples 1-5. On the premise of not influencing the strength of concrete, the invention firstly introduces a large amount of tiny, closed and stable bubbles into the concrete and secondly introduces amide monomers to lead the polymer to be polymerizedHas certain slurry collecting capacity, thereby achieving the purpose of improving the workability of concrete. When the concrete of the synthetic comparative example 1 is doped, the popularity has a reverse growth phenomenon, segregation and bleeding phenomena occur in 0 and 60min, and the bleeding rate in 60min is more than 0min, because the structure of the monomer C is improper, the dispersion retentivity and the air entraining performance of a final product are influenced. Segregation and bleeding phenomena occur in 0 and 60min when the concrete of synthetic comparative example 2 is blended, and the improper structure of the monomer D influences the size, distribution and foam stability of the foam introduced into air bubbles of the final product. When the concrete of the comparative example 1 is added, segregation and bleeding phenomena appear in 0 and 60min, the improvement effect on the workability of the concrete is limited, and the poor foam stability of the concrete is closely related. Although the concrete doped in the comparative example 2 has no segregation and bleeding phenomena, the fluidity of the concrete is obviously reduced. The concrete with the addition of comparative example 3 (without monomer D) showed similar phenomena to comparative example 1, with segregation and bleeding occurring in both the concretes at 0 and 60min, due to the poor foam stability of comparative example 3. The concrete with the comparative example 4 (without monomer C) had no segregation, bleeding, but no dispersing properties. The concrete mixed with the concrete of comparative example 5 (without monomer B) has excellent foam stability, but has limited slurry receiving capacity, and the segregation and bleeding phenomena of the concrete still occur.
The data in Table 8 show the same rules as the data in Table 6, and from the data in Table 8, it can be seen that in high cementitious concrete, comparative examples 1-2 and comparative examples 1-5 were synthesized, T being compared to the examples50The time increases significantly. Comparative examples 2 and 4 are due to loss of fluidity to increase of concrete viscosity, T50The time is increased; comparative examples 1-2, comparative example 1, comparative example 3 and comparative example 5 were synthesized because the concrete showed segregation and bleeding, T50The time increases.
Claims (8)
1. A concrete workability regulator with water-reducing function is characterized in that the concrete workability regulator comprises workability regulating macromolecules and water;
the workability adjusting macromolecule is obtained by copolymerization reaction, and the comonomer comprises polymerization active end micro-hydrophobic modified polyether, alpha-alkenyl sodium sulfonate, a monomer A represented by a general formula (1) and a monomer B represented by a general formula (2a), (2B) or (2 c);
the structure of the polymerization active end micro-hydrophobic modified polyether is as follows: the polyether chain segment is connected to-O-of the unsaturated alcohol, the propoxy structural unit is connected firstly, and then the ethoxy structural unit is connected, so that a hydrophobic-hydrophilic structure is formed; the molecular weight of the polymeric active end micro-hydrophobic modified polyether is 500-3000;
the structural characteristics of the alpha-sodium alkenyl sulfonate are as follows: one end is a C ═ C double bond, and the other end is-SO3Na with an intermediate of-CH2-; the structural formula of the alpha-alkenyl sodium sulfonate is as follows:
wherein n represents an integer of 6-14, and the value of n is too large or too small, so that the size, distribution and foam stability of the foam introduced into the final product are influenced;
the monomer A is a substance represented by the general formula (1):
wherein M is1Represents a hydrogen atom, a monovalent alkali metal ion or an ammonium ion; r1Represents a hydrogen atom or a methyl group;
the monomer B is a substance represented by the general formula (2a), (2B) or (2 c):
wherein R is1Having the meaning described in formula (1); r2、R3Independently of one another are hydrogen atoms or C1-to C4Alkyl of (a) or C1-to C4Hydroxyalkyl of or C5-to C8Cycloalkyl of (A) or (C)6-to C14-an aryl group;
wherein R is1Having the meaning described in formula (1); r4Represents a hydrogen atom or C1-to C4Alkyl of-or-COOM1Wherein M is1Having the meaning described in formula (1); m represents an integer of 1 to 3;
wherein R is1And R2Have the meanings indicated in the formulae (1) and (2a), respectively.
2. The concrete workability regulator with water-reducing function according to claim 1,
the structural formula of the polymerized active end micro-hydrophobic modified polyether is as follows:
wherein x represents an integer of 0 to 4, p is an average molar number of propylene oxide added and is an integer of 1 to 12, q is an average molar number of ethylene oxide added and is an integer of 10 to 65, R5Represents a hydrogen atom, a methyl group or an ethyl group.
3. The concrete workability regulator with water-reducing function according to claim 2, characterized in that the polymeric active-end slightly-hydrophobically modified polyether is polypropylene glycol polyethylene glycol vinyl ether, polypropylene glycol polyethylene glycol allyl ether, polypropylene glycol polyethylene glycol methyl allyl ether or polypropylene glycol polyethylene glycol methyl butenyl ether.
4. The concrete workability regulator with water-reducing function according to any one of claims 1 to 3, characterized in that the sodium α -alkenyl sulfonate is sodium α -alkenyl octyl sulfonate, sodium α -alkenyl nonyl sulfonate, sodium α -alkenyl decyl sulfonate, sodium α -alkenyl undecyl sulfonate or sodium α -alkenyl dodecyl sulfonate.
5. The preparation method of the concrete workability regulator with the water reducing function according to any one of claims 1 to 4, characterized in that the concrete workability regulator with the water reducing function is prepared by a free radical copolymerization reaction of a monomer A, a monomer B, a monomer C and a monomer D under a neutral environment, wherein the molar ratio of the components A, B, C and D is 1.0: 0.5-2.0: 0.2-0.5: 0.3-1.5;
the monomer C is the polymerized active end micro-hydrophobic modified polyether;
the monomer D is the sodium alpha-alkenyl sulfonate;
the molecular weight of the concrete workability regulator with the water reducing function is 3 multiplied by 104～12×104。
6. A process according to claim 5, and wherein said monomer A is acrylic acid or methacrylic acid.
7. The method according to claim 5, wherein the monomer B is any one of acrylamide, methacrylamide, N-ethylacrylamide, N-dimethylacrylamide, N-methylolacrylamide, N-dicyclohexylacrylamide, N-benzylacrylamide, N-vinylcaprolactam, N-vinylpyrrolidone, N-vinylformamide and N-vinylacetamide.
8. The method according to any one of claims 5 to 7, comprising in particular the steps of:
(1) adding a monomer A, a monomer B, a monomer C, a monomer D and deionized water into a reactor provided with a thermometer, a stirrer, a dropping funnel and a nitrogen inlet pipe, and neutralizing the mixture by using 32% of liquid alkali solution until the pH value is 7-8;
(2) starting stirring, blowing the reactor with nitrogen while stirring, and heating to 50 ℃;
(3) preparing an initiator into a solution with the mass concentration of 1.0-2.0%, preparing a chain transfer agent into a solution with the mass concentration of 5.0-10.0%, slowly dripping the prepared initiator and the prepared chain transfer agent solution into a reactor within 2h and 2.5h respectively, after dripping is finished, heating to 70-80 ℃, and continuously reacting for 4-6 h at the temperature to obtain a polymer with the solid content of 25-35%, namely the concrete workability regulator macromolecule with the water reducing function;
the initiator is selected from water-soluble azo initiators or persulfate initiators; the water-soluble azo initiator is selected from any one of azobisisobutylamidine hydrochloride, azobisisobutylimidazoline hydrochloride, azobiscyanovaleric acid and azobisisopropylimidazoline; the persulfate initiator is selected from any one of sodium persulfate, potassium persulfate and ammonium persulfate; the dosage of the initiator accounts for 0.5 to 2.0 percent of the total weight of the reactants A, B, C and D;
the chain transfer agent is one or the combination of more than two of dodecanethiol, hexadecanethiol, mercaptoethanol, thioglycolic acid, 2-mercaptopropionic acid and 3-mercaptopropionic acid in any proportion; the dosage of the chain transfer agent is 2.5 to 5.0 percent of the total mole number of the monomer A, the monomer B, the monomer C and the monomer D.
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| CN115353594A (en) * | 2022-08-25 | 2022-11-18 | 中建西部建设建材科学研究院有限公司 | A water-retaining agent for machine-made sand concrete, its preparation method and its application method |
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