CN111440273A - Efficient slump retaining agent and preparation method thereof - Google Patents
Efficient slump retaining agent and preparation method thereof Download PDFInfo
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- CN111440273A CN111440273A CN202010454174.0A CN202010454174A CN111440273A CN 111440273 A CN111440273 A CN 111440273A CN 202010454174 A CN202010454174 A CN 202010454174A CN 111440273 A CN111440273 A CN 111440273A
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- 238000002360 preparation method Methods 0.000 title claims description 8
- 239000000178 monomer Substances 0.000 claims abstract description 81
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 36
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 30
- 239000002131 composite material Substances 0.000 claims abstract description 19
- PPASLZSBLFJQEF-RXSVEWSESA-M sodium-L-ascorbate Chemical compound [Na+].OC[C@H](O)[C@H]1OC(=O)C(O)=C1[O-] PPASLZSBLFJQEF-RXSVEWSESA-M 0.000 claims abstract description 18
- 239000003999 initiator Substances 0.000 claims abstract description 16
- -1 isopentenyl Chemical group 0.000 claims abstract description 15
- 229920000151 polyglycol Polymers 0.000 claims abstract description 15
- 239000010695 polyglycol Substances 0.000 claims abstract description 15
- 239000000203 mixture Substances 0.000 claims abstract description 9
- OMIGHNLMNHATMP-UHFFFAOYSA-N 2-hydroxyethyl prop-2-enoate Chemical compound OCCOC(=O)C=C OMIGHNLMNHATMP-UHFFFAOYSA-N 0.000 claims abstract description 6
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 claims abstract description 6
- DNJIEGIFACGWOD-UHFFFAOYSA-N ethyl mercaptane Natural products CCS DNJIEGIFACGWOD-UHFFFAOYSA-N 0.000 claims abstract description 6
- DGVVWUTYPXICAM-UHFFFAOYSA-N β‐Mercaptoethanol Chemical group OCCS DGVVWUTYPXICAM-UHFFFAOYSA-N 0.000 claims abstract description 6
- 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 5
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 5
- DBMBAVFODTXIDN-UHFFFAOYSA-N 2-methylbutane-2-sulfonic acid Chemical compound CCC(C)(C)S(O)(=O)=O DBMBAVFODTXIDN-UHFFFAOYSA-N 0.000 claims abstract description 5
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 claims abstract description 4
- QZPSOSOOLFHYRR-UHFFFAOYSA-N 3-hydroxypropyl prop-2-enoate Chemical compound OCCCOC(=O)C=C QZPSOSOOLFHYRR-UHFFFAOYSA-N 0.000 claims abstract description 4
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims abstract description 4
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims abstract description 4
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 claims abstract description 4
- CHDKQNHKDMEASZ-UHFFFAOYSA-N n-prop-2-enoylprop-2-enamide Chemical compound C=CC(=O)NC(=O)C=C CHDKQNHKDMEASZ-UHFFFAOYSA-N 0.000 claims abstract description 4
- WVSFUMAHZBOQGJ-UHFFFAOYSA-N phosphono 2-methylprop-2-eneperoxoate Chemical compound CC(=C)C(=O)OOP(O)(O)=O WVSFUMAHZBOQGJ-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229920002818 (Hydroxyethyl)methacrylate Polymers 0.000 claims abstract description 3
- WOBHKFSMXKNTIM-UHFFFAOYSA-N Hydroxyethyl methacrylate Chemical compound CC(=C)C(=O)OCCO WOBHKFSMXKNTIM-UHFFFAOYSA-N 0.000 claims abstract description 3
- 239000001530 fumaric acid Substances 0.000 claims abstract description 3
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 claims abstract description 3
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical group OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 239000002904 solvent Substances 0.000 claims description 4
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 3
- 239000011790 ferrous sulphate Substances 0.000 claims description 3
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 3
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 239000004567 concrete Substances 0.000 abstract description 22
- 239000003638 chemical reducing agent Substances 0.000 description 9
- 239000002253 acid Substances 0.000 description 6
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 4
- 230000001603 reducing effect Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000006116 polymerization reaction Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920005646 polycarboxylate Polymers 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 235000010378 sodium ascorbate Nutrition 0.000 description 2
- 229960005055 sodium ascorbate Drugs 0.000 description 2
- PPASLZSBLFJQEF-RKJRWTFHSA-M sodium ascorbate Substances [Na+].OC[C@@H](O)[C@H]1OC(=O)C(O)=C1[O-] PPASLZSBLFJQEF-RKJRWTFHSA-M 0.000 description 2
- 239000008030 superplasticizer Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 description 1
- 229930006000 Sucrose Natural products 0.000 description 1
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 125000003368 amide group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 125000004185 ester group Chemical group 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012994 industrial processing Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- ZIUHHBKFKCYYJD-UHFFFAOYSA-N n,n'-methylenebisacrylamide Chemical compound C=CC(=O)NCNC(=O)C=C ZIUHHBKFKCYYJD-UHFFFAOYSA-N 0.000 description 1
- DGVVJWXRCWCCOD-UHFFFAOYSA-N naphthalene;hydrate Chemical compound O.C1=CC=CC2=CC=CC=C21 DGVVJWXRCWCCOD-UHFFFAOYSA-N 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000979 retarding effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 235000012207 sodium gluconate Nutrition 0.000 description 1
- 239000000176 sodium gluconate Substances 0.000 description 1
- 229940005574 sodium gluconate Drugs 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000005720 sucrose Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002699 waste material Substances 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
-
- 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
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/302—Water reducers
-
- 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
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/308—Slump-loss preventing agents
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The efficient slump retaining agent comprises the following components in parts by weight: 250-600 parts of monomer A, 11-40 parts of monomer B, 20-60 parts of monomer C, 5-15 parts of monomer D, 1-20 parts of initiator, 0.8-10 parts of composite molecular weight regulator, 0.5-4 parts of vitamin C sodium and 300-700 parts of water, wherein the monomer A is any one or mixture of isopentenyl polyglycol ether, hydroxybutyl vinyl polyglycol ether and ethoxy vinyl polyglycol ether, the monomer B is any one or mixture of acrylic acid, fumaric acid, itaconic acid and maleic anhydride, the monomer C is any one or mixture of hydroxyethyl acrylate, hydroxypropyl acrylate, methacryloxy phosphate and hydroxyethyl methacrylate, the monomer D is diacrylamide dimethyl propanesulfonic acid or acrylamide, and the composite molecular regulator is mercaptoethanol. The components are stirred to react to prepare the product. The high-efficiency slump retaining agent provided by the invention has the advantages of good slump retaining performance, small performance fluctuation and excellent adaptability, and can effectively meet the slump retaining requirements of concrete in various regions.
Description
Technical Field
The invention relates to the field of building materials, and particularly relates to a high-efficiency slump retaining agent and a preparation method thereof.
Background
The polycarboxylate superplasticizer serving as a third-generation water reducer behind secondary lignin and naphthalene water reducers has the characteristics of low mixing amount, high water reduction rate, good flowability and slump retaining property of fresh concrete, low shrinkage, excellent durability of concrete, strong molecular design property and the like, and has green and environment-friendly properties of no use of formaldehyde, no waste liquid and waste gas discharge and the like in the production process. The invention of the polycarboxylate superplasticizer improves the concrete performance to a great extent and promotes the continuous development of concrete technology. Therefore, the polycarboxylic acid water reducing agent is widely applied to the fields of municipal administration, railways, highways, ports, bridges, hydropower and the like. With the rapid development of economy and the continuous improvement of building level in China, the requirement on the quality of concrete is higher and higher. However, due to the fact that domestic cement varieties are numerous, the fluctuation of cement quality is large, the quality of concrete gravel is poor, for example, the content of mud and the content of stone powder in gravel are high, the quality of some machine-made sand is poor, and the like, the phenomenon that concrete slump loss is fast often occurs, and the difficulty of concrete construction and quality control is increased. In construction, retarding components such as sodium gluconate and sucrose are usually compounded in the polycarboxylic acid water reducing agent to control the problem of fast slump loss of concrete, but excessive mixing amount can prolong the setting time of the concrete and slow down the construction progress. Therefore, an additive capable of improving the slump retaining capacity of the polycarboxylic acid water reducing agent or a polycarboxylic acid slump retaining agent with good adaptability and strong slump retaining capacity is urgently needed, and becomes a hotspot in the research of the polycarboxylic acid water reducing agent.
Disclosure of Invention
One of the purposes of the invention is to provide an efficient slump retaining agent aiming at the defects of the prior art, which has the advantages of good slump retaining performance, small performance fluctuation and excellent adaptability, and can effectively meet the slump retaining requirements of concrete in various regions.
The invention also aims to provide the preparation method of the high-efficiency slump retaining agent, which has the advantages of simple and convenient preparation process, mild process parameters and suitability for industrial processing production.
The technical scheme for realizing one purpose of the invention is as follows: the efficient slump retaining agent comprises the following components in parts by weight:
250-600 parts of monomer A, 11-40 parts of monomer B, 20-60 parts of monomer C, 5-15 parts of monomer D, 1-20 parts of initiator, 0.8-10 parts of composite molecular weight regulator, 0.5-4 parts of vitamin C sodium and 300-700 parts of water,
The monomer A is one or a mixture of more of isopentenyl polyglycol ether, hydroxybutyl vinyl polyglycol ether and ethoxy vinyl polyglycol ether, the monomer B is one or a mixture of two of acrylic acid, fumaric acid, itaconic acid and maleic anhydride, the monomer C is one or a mixture of more of hydroxyethyl acrylate, hydroxypropyl acrylate, methacryloxy phosphate and hydroxyethyl methacrylate, the monomer D is diacrylamide dimethyl propanesulfonic acid or acrylamide, and the composite molecular regulator is mercaptoethanol.
Preferably, the high-efficiency slump retaining agent comprises the following components in parts by weight:
300-450 parts of monomer A, 15-40 parts of monomer B, 30-54 parts of monomer C, 6-15 parts of monomer D, 1-20 parts of initiator, 2-5 parts of composite molecular weight regulator, 2-4 parts of vitamin C sodium and 421-613 parts of water.
Preferably, the high-efficiency slump retaining agent comprises the following components in parts by weight:
300 parts of monomer A, 15 parts of monomer B, 50 parts of monomer C, 15 parts of monomer D, 1 part of initiator, 3 parts of composite molecular weight regulator, 3 parts of vitamin C sodium and 613 parts of water.
Preferably, the high-efficiency slump retaining agent comprises the following components in parts by weight:
400 parts of monomer A, 20 parts of monomer B, 30 parts of monomer C, 8 parts of monomer D, 10 parts of initiator, 2 parts of composite molecular weight regulator, 2 parts of vitamin C sodium and 528 parts of water.
Preferably, the high-efficiency slump retaining agent comprises the following components in parts by weight:
450 parts of monomer A, 40 parts of monomer B, 54 parts of monomer C, 6 parts of monomer D, 20 parts of initiator, 5 parts of composite molecular weight regulator, 4 parts of vitamin C sodium and 421 parts of water.
Further, the initiator is hydrogen peroxide or ferrous sulfate.
Further, the average molecular weight of the monomer A is 2000-4000.
The second technical scheme for realizing the aim of the invention is as follows:
The preparation method of the high-efficiency slump retaining agent comprises the following steps:
1) Taking materials according to a proportion;
2) Dissolving vitamin C sodium and the composite molecular weight regulator in water to obtain a first solution for later use;
3) Dissolving the monomer B, the monomer C and the monomer D in water to obtain a second solution for later use;
4) And (3) taking the remaining water-soluble monomer A and the initiator, stirring at 40 ℃ until the monomer A is completely dissolved, dropwise adding the first solution at the speed of 0.1-0.7g/min, dropwise adding the second solution at the speed of 0.3-1.5g/min after dropwise adding the first solution for 0.1-1h, and reacting to obtain the target product.
Further, the mass part of the solvent of the first solution in the step 2) is 10-80 parts, and the dropping speed of the first solution in the step 4) is 0.2 g/min.
Further, the mass part of the solvent of the second solution in the step 3) is 20-120 parts, and the dropping speed of the second solution in the step 4) is 0.6 g/min.
Adopt above-mentioned technical scheme to have following beneficial effect:
1. According to the efficient slump retaining agent, the component monomer B is unsaturated acid and is used for adjusting the water reducing effect of the slump retaining agent, if the component monomer B is added too much, concrete is easy to bleed and stick to the bottom, the strength of the concrete is influenced, and if the component monomer B is added too little, the water reducing effect of the slump retaining agent is poor; ester groups of the component monomer C can be hydrolyzed to generate carboxyl, the carboxyl consumed in concrete can be continuously supplemented, the slump of the concrete can be kept for a longer time, if the carboxyl is excessively added, the initial water reducing effect of the high-efficiency slump retaining agent is poor, and along with the lapse of time, the problems that the high-efficiency slump retaining agent is easy to bleed and stick to the bottom and the setting time is prolonged are caused, and if the carboxyl is excessively added, the slump retaining effect is poor; the amide group in the component monomer D is used for improving the problem of strength reduction caused by adding the monomer C, and can effectively improve the workability of concrete.
2. According to the preparation method of the high-efficiency slump retaining agent, the monomer A is polymerized into the side chain under the action of the initiator, the energy consumption can be effectively reduced on the premise of meeting the polymerization degree of the side chain by controlling the polymerization temperature to be 40 ℃, if the process temperature is higher than 40 ℃, the production temperature is not favorably controlled, and if the process temperature is lower than 40 ℃, the monomer activity is insufficient, so that the polymerization degree of the side chain is reduced; then, adding the sodium ascorbate and a composite molecular weight regulator, wherein the sodium ascorbate and hydrogen peroxide form an oxidation-reduction system for reducing the initiation temperature; the dropping speed of the composite molecular weight regulator is controlled to control the molecular weight distribution; finally, the monomer B, the monomer C and the monomer D are dripped, corresponding main chain groups are grafted on the main chain respectively, and the dripping speed of the second solution is controlled to control the distribution density of the functional groups.
3. Proved by experiments of an applicant, compared with the common slump retaining water reducing agents added on the market, the slump constant of 1h can be improved by more than 50%, the slump constant of 3h can be improved by more than 260%, the slump retaining time of the concrete can be greatly prolonged to more than 4h, and the requirement of the concrete for long-distance transportation can be effectively met.
The following is a further description with reference to specific examples.
Detailed Description
The present invention will be further described with reference to the following specific examples. This example is not intended to show the preferred embodiment of the invention
Example 1
Putting 200g of hydroxybutyl vinyl polyglycol ether and 196g of water into a three-neck flask, and mechanically stirring at 40 ℃ until the hydroxybutyl vinyl polyglycol ether is completely dissolved; adding 1g of hydrogen peroxide, and continuously stirring for 5 min; 0.45g of vitamin C sodium, 1g of mercaptoethanol and 38g of water are uniformly stirred in a beaker and then are dripped into a three-neck flask at the dripping speed of 0.2 g/min; after 10min, 7.6g of acrylic acid, 24.5g of hydroxyethyl acrylate and 4g of monomer bisacrylamide dimethyl propanesulfonic acid are uniformly stirred in a beaker and then are dripped into a three-neck flask at the dripping speed of 0.49 g/min; after the dripping is finished for 3h, the temperature is kept for 0.5 h. And discharging after the reaction is finished to obtain the product.
Example 2
Mechanically stirring 190g of isopentenyl polyglycol ether and 203g of water at 45 ℃ until the isopentenyl polyglycol ether and the water are completely dissolved; adding 1g of hydrogen peroxide, and continuously stirring for 5 min; 0.5g of vitamin C sodium, 0.9g of mercaptoethanol and 43g of water are uniformly stirred in a beaker and then are dripped into a three-neck flask at the dripping speed of 0.22 g/min; after 10min, 6.5g of acrylic acid, 4g of itaconic acid, 13.9g of hydroxyethyl acrylate, 8.7g of methacryloxy phosphate and 7g of acrylamide are uniformly stirred in a beaker and then are dripped into a three-neck flask at the dripping speed of 0.53 g/min; after the dripping is finished for 3.5h, the temperature is kept for 1 h. And discharging after the reaction is finished to obtain the product.
Example 3
210g of hydroxybutyl vinyl polyglycol ether and 195g of water are mechanically stirred at 50 ℃ until the hydroxybutyl vinyl polyglycol ether and the water are completely dissolved; adding 1g of ferrous sulfate, and continuously stirring for 10 min; 0.56g of vitamin C sodium, 0.86g of mercaptoethanol and 43g of water are uniformly stirred in a beaker and then are dripped into a three-neck flask at the dripping speed of 0.23 g/min; after 10min, 7.8g of monomer maleic anhydride, 12.4g of hydroxyethyl acrylate, 13.2g of hydroxypropyl acrylate and 5g of diacrylamide dimethyl propanesulfonic acid are uniformly stirred in a beaker and then are dripped into a three-neck flask at the dripping speed of 0.56 g/min; after the dripping is finished for 3.5h, the temperature is kept for 1 h. And discharging after the reaction is finished to obtain the product.
Comparative tests (tests according to JC/T2481-2018 concrete slump retainer):
1 #: blank control, only water was added. Controlling the slump constant to be 80 +/-10 mm;
2 #: adding a common carboxylic acid water reducing agent sold in the market and controlling the slump constant to be 80 +/-10 mm;
3 #: adding a common slump retaining carboxylic acid water reducing agent sold in the market and controlling the slump to be 80 +/-10 mm;
4 #: the high-efficiency slump retaining agent is doped and the slump of the slump retaining agent is controlled to be 80 +/-10 mm.
The results of comparative experimental performance tests are shown in table 1 and can be seen: under the condition of the same initial value, the addition of the high-efficiency slump retaining agent can greatly prolong the slump retaining time of concrete to more than 4 h; the high-temperature-resistant and high-temperature-resistant composite material has excellent use space in long-distance transportation under the high-temperature condition in summer.
TABLE 1 comparison of concrete slump loss with time
Claims (10)
1. The efficient slump retaining agent is characterized by comprising the following components in parts by weight:
250-600 parts of monomer A, 11-40 parts of monomer B, 20-60 parts of monomer C, 5-15 parts of monomer D, 1-20 parts of initiator, 0.8-10 parts of composite molecular weight regulator, 0.5-4 parts of vitamin C sodium and 300-700 parts of water,
The monomer A is one or a mixture of more of isopentenyl polyglycol ether, hydroxybutyl vinyl polyglycol ether and ethoxy vinyl polyglycol ether, the monomer B is one or a mixture of two of acrylic acid, fumaric acid, itaconic acid and maleic anhydride, the monomer C is one or a mixture of more of hydroxyethyl acrylate, hydroxypropyl acrylate, methacryloxy phosphate and hydroxyethyl methacrylate, the monomer D is diacrylamide dimethyl propanesulfonic acid or acrylamide, and the composite molecular regulator is mercaptoethanol.
2. The efficient slump retaining agent as claimed in claim 1, which is characterized by comprising the following components in parts by weight:
300-450 parts of monomer A, 15-40 parts of monomer B, 30-54 parts of monomer C, 6-15 parts of monomer D, 1-20 parts of initiator, 2-5 parts of composite molecular weight regulator, 2-4 parts of vitamin C sodium and 421-613 parts of water.
3. The efficient slump retaining agent as claimed in claim 1, which is characterized by comprising the following components in parts by weight:
300 parts of monomer A, 15 parts of monomer B, 50 parts of monomer C, 15 parts of monomer D, 1 part of initiator, 3 parts of composite molecular weight regulator, 3 parts of vitamin C sodium and 613 parts of water.
4. The efficient slump retaining agent as claimed in claim 1, which is characterized by comprising the following components in parts by weight:
400 parts of monomer A, 20 parts of monomer B, 30 parts of monomer C, 8 parts of monomer D, 10 parts of initiator, 2 parts of composite molecular weight regulator, 2 parts of vitamin C sodium and 528 parts of water.
5. The efficient slump retaining agent as claimed in claim 1, which is characterized by comprising the following components in parts by weight:
450 parts of monomer A, 40 parts of monomer B, 54 parts of monomer C, 6 parts of monomer D, 20 parts of initiator, 5 parts of composite molecular weight regulator, 4 parts of vitamin C sodium and 421 parts of water.
6. The efficient slump retaining agent as claimed in any one of claims 1 to 5, wherein the initiator is hydrogen peroxide or ferrous sulfate.
7. The high-efficiency slump retaining agent according to any one of claims 1 to 5, wherein the average molecular weight of the monomer A is 2000-4000.
8. The preparation method of the high-efficiency slump retaining agent as claimed in any one of claims 1 to 5, is characterized by comprising the following steps:
1) Taking materials according to a proportion;
2) Dissolving vitamin C sodium and the composite molecular weight regulator in water to obtain a first solution for later use;
3) Dissolving the monomer B, the monomer C and the monomer D in water to obtain a second solution for later use;
4) And (3) taking the remaining water-soluble monomer A and the initiator, stirring at 40 ℃ until the monomer A is completely dissolved, dropwise adding the first solution at the speed of 0.1-0.7g/min, dropwise adding the second solution at the speed of 0.3-1.5g/min after dropwise adding the first solution for 0.1-1h, and reacting to obtain the target product.
9. The production method according to claim 8, wherein the mass part of the solvent of the first solution in step 2) is 10 to 80 parts, and the dropping rate of the first solution in step 4) is 0.2 g/min.
10. The production method according to claim 8, wherein the solvent of the second solution in step 3) is 20 to 120 parts by mass, and the dropping rate of the second solution in step 4) is 0.6 g/min.
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Cited By (2)
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| CN113214438A (en) * | 2021-06-29 | 2021-08-06 | 安徽海螺新材料科技有限公司 | Polycarboxylic acid water reducing agent containing maleic anhydride and preparation method thereof |
| CN115417614A (en) * | 2022-10-19 | 2022-12-02 | 广州市建筑科学研究院集团有限公司 | Bidirectional flocculant regulating auxiliary agent and preparation method and application thereof |
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