CN117800637A - Polycarboxylic acid pumping aid and preparation process thereof - Google Patents
Polycarboxylic acid pumping aid and preparation process thereof Download PDFInfo
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- CN117800637A CN117800637A CN202311851081.1A CN202311851081A CN117800637A CN 117800637 A CN117800637 A CN 117800637A CN 202311851081 A CN202311851081 A CN 202311851081A CN 117800637 A CN117800637 A CN 117800637A
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- polycarboxylic acid
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- mixed solution
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- 238000005086 pumping Methods 0.000 title claims abstract description 41
- 239000002253 acid Substances 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 68
- 239000000463 material Substances 0.000 claims abstract description 46
- 238000002156 mixing Methods 0.000 claims abstract description 44
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 27
- 229920002472 Starch Polymers 0.000 claims abstract description 23
- 239000000835 fiber Substances 0.000 claims abstract description 23
- 239000008107 starch Substances 0.000 claims abstract description 23
- 235000019698 starch Nutrition 0.000 claims abstract description 23
- 239000007787 solid Substances 0.000 claims abstract description 19
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 17
- 238000004880 explosion Methods 0.000 claims abstract description 16
- 239000000843 powder Substances 0.000 claims abstract description 9
- YDEXUEFDPVHGHE-GGMCWBHBSA-L disodium;(2r)-3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Na+].[Na+].COC1=CC=CC(C[C@H](CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O YDEXUEFDPVHGHE-GGMCWBHBSA-L 0.000 claims abstract description 8
- SONHXMAHPHADTF-UHFFFAOYSA-M sodium;2-methylprop-2-enoate Chemical compound [Na+].CC(=C)C([O-])=O SONHXMAHPHADTF-UHFFFAOYSA-M 0.000 claims abstract description 8
- 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 claims abstract description 7
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims abstract description 7
- 230000001590 oxidative effect Effects 0.000 claims abstract description 7
- 239000000176 sodium gluconate Substances 0.000 claims abstract description 7
- 229940005574 sodium gluconate Drugs 0.000 claims abstract description 7
- 235000012207 sodium gluconate Nutrition 0.000 claims abstract description 7
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims abstract description 7
- 238000012986 modification Methods 0.000 claims abstract description 4
- 230000004048 modification Effects 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims description 51
- 239000011259 mixed solution Substances 0.000 claims description 29
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 24
- 239000000203 mixture Substances 0.000 claims description 20
- 239000002994 raw material Substances 0.000 claims description 14
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims description 12
- 239000002202 Polyethylene glycol Substances 0.000 claims description 12
- 229920001223 polyethylene glycol Polymers 0.000 claims description 12
- 238000004321 preservation Methods 0.000 claims description 11
- 239000000243 solution Substances 0.000 claims description 8
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 6
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 6
- 239000002211 L-ascorbic acid Substances 0.000 claims description 6
- 235000000069 L-ascorbic acid Nutrition 0.000 claims description 6
- 229960005070 ascorbic acid Drugs 0.000 claims description 6
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 6
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 239000007800 oxidant agent Substances 0.000 claims description 6
- 238000000967 suction filtration Methods 0.000 claims description 6
- CWERGRDVMFNCDR-UHFFFAOYSA-N thioglycolic acid Chemical compound OC(=O)CS CWERGRDVMFNCDR-UHFFFAOYSA-N 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- WOBHKFSMXKNTIM-UHFFFAOYSA-N Hydroxyethyl methacrylate Chemical compound CC(=C)C(=O)OCCO WOBHKFSMXKNTIM-UHFFFAOYSA-N 0.000 claims description 4
- 230000001502 supplementing effect Effects 0.000 claims description 4
- VQTUBCCKSQIDNK-UHFFFAOYSA-N Isobutene Chemical group CC(C)=C VQTUBCCKSQIDNK-UHFFFAOYSA-N 0.000 claims description 3
- -1 isobutenyl Chemical group 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 230000007935 neutral effect Effects 0.000 claims description 3
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims description 2
- MOTZDAYCYVMXPC-UHFFFAOYSA-N dodecyl hydrogen sulfate Chemical compound CCCCCCCCCCCCOS(O)(=O)=O MOTZDAYCYVMXPC-UHFFFAOYSA-N 0.000 claims description 2
- 150000002148 esters Chemical class 0.000 claims description 2
- 238000007254 oxidation reaction Methods 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 6
- 238000012545 processing Methods 0.000 abstract description 3
- 239000000654 additive Substances 0.000 abstract description 2
- 230000000996 additive effect Effects 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 241000196324 Embryophyta Species 0.000 description 9
- 244000060011 Cocos nucifera Species 0.000 description 4
- 235000013162 Cocos nucifera Nutrition 0.000 description 4
- 229920002261 Corn starch Polymers 0.000 description 4
- 239000008120 corn starch Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 230000001603 reducing effect Effects 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920005646 polycarboxylate Polymers 0.000 description 2
- 230000000979 retarding effect Effects 0.000 description 2
- 239000003513 alkali Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000010413 mother solution Substances 0.000 description 1
- 238000010405 reoxidation reaction Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229920005552 sodium lignosulfonate Polymers 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
- 239000004575 stone Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/18—Waste materials; Refuse organic
- C04B18/24—Vegetable refuse, e.g. rice husks, maize-ear refuse; Cellulosic materials, e.g. paper, cork
- C04B18/248—Vegetable refuse, e.g. rice husks, maize-ear refuse; Cellulosic materials, e.g. paper, cork from specific plants, e.g. hemp fibres
-
- 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
- C04B24/18—Lignin sulfonic acid or derivatives thereof, e.g. sulfite lye
-
- 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
- C04B24/28—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/32—Polyethers, e.g. alkylphenol polyglycolether
-
- 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
- C04B24/38—Polysaccharides or derivatives thereof
-
- 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
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/20—Retarders
- C04B2103/22—Set retarders
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Organic Chemistry (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Botany (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Health & Medical Sciences (AREA)
- Polymers & Plastics (AREA)
- Medicinal Chemistry (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
The invention provides a polycarboxylic acid pumping agent and a preparation process thereof, and relates to the technical field of concrete additive processing. The polycarboxylic acid pumping aid is mainly prepared by mixing a polycarboxylic acid water reducer with the solid content of 40%, sodium lignin sulfonate, sodium methacrylate sulfonate, sodium dodecyl sulfate, a plant fiber combined starch modified material and sodium gluconate, wherein the plant fiber combined starch modified material is obtained by mixing plant fiber powder with starch, gelatinizing, steam explosion treatment and finally oxidizing modification. The invention overcomes the defects of the prior art, effectively ensures that the concrete has higher fluidity and slump in a longer time, improves the early strength of the subsequent concrete, and comprehensively improves the construction stability of the concrete.
Description
Technical Field
The invention relates to the technical field of concrete additive processing, in particular to a polycarboxylic acid pumping agent and a preparation process thereof.
Background
The concrete admixture is taken as a fifth component of concrete and is a necessary means for improving and improving the performance of modern concrete. The polycarboxylate water reducer (PCA) is used as a concrete admixture of the most mainstream variety at present, and has the characteristics of high water reducing rate, excellent slump retaining performance, rapid strength increase, extremely low alkali content, environmental protection and the like, meets the requirements of the development of the modern concrete technology towards high strength, green and high performance, and becomes a hot spot for research and development of the concrete admixture at home and abroad.
The concrete is transported to a construction site from a mixing station in the current stage, but the concrete is partially coagulated and caked due to low use efficiency in the transportation time process or the construction, so that the pumping agent is required to be added when the concrete is mixed, the pumping performance of the concrete can be well improved, the caked of the concrete in the transportation or the waiting construction process is effectively prevented, and the slump retaining performance of the concrete is comprehensively improved.
The conventional pumping aid is composed of a water reducing agent mixed retarder, and the conventional pumping aid can achieve the purpose of slump retention and retarding to a certain extent, but most of the conventional pumping aid can enable concrete to retain more than 80% of slump within 1h, so that the fluidity and slump retention effect of concrete after 2h are poor, and the stability of the concrete is lowered for large-scale construction and long-range concrete transportation, so that the slump retention performance of the concrete can be improved, the fluidity of the concrete can be effectively improved, and the loss and waste are reduced by optimally designing a novel polycarboxylic pumping aid.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the polycarboxylic acid pumping agent and the preparation process thereof, which effectively ensure that the concrete has higher fluidity and slump in a longer time, improve the early strength of the subsequent concrete and comprehensively improve the construction stability of the concrete.
In order to achieve the above object, the technical scheme of the present invention is realized by the following technical scheme:
the polycarboxylic acid pumping agent is prepared from the following raw materials in percentage by mass: 10-40% of polycarboxylic acid water reducer with solid content of 40%, 2-4% of sodium lignin sulfonate, 2-4% of sodium methacrylate sulfonate, 1-1.5% of sodium dodecyl sulfate, 3-7% of plant fiber combined starch modified material, 2-4% of sodium gluconate and the balance of water; wherein the plant fiber and starch combined modified material is obtained by mixing plant fiber powder with the grain diameter of 100-400 mu m and starch with the mass ratio of 1:1-2, gelatinizing, performing steam explosion treatment, and performing post-oxidation modification.
Preferably, the solid content of the polycarboxylic acid water reducer with the solid content of 40% comprises the following raw materials in parts by mass: 320-380 parts of isobutenyl polyethylene glycol ether, 20-30 parts of acrylic acid, 8-12 parts of methacrylic acid polyethylene glycol ester, 2-5 parts of L-ascorbic acid, 1-2 parts of thioglycollic acid, 1-4 parts of butyl acrylate and 3-5 parts of hydrogen peroxide.
Preferably, the preparation method of the polycarboxylic acid water reducer with the solid content of 40 percent comprises the following steps:
s1-1, mixing acrylic acid, polyethylene glycol methacrylate and butyl acrylate, adding 10 times of water, and uniformly stirring to obtain a mixed solution A for later use;
s1-2, mixing L-ascorbic acid and thioglycollic acid, adding 40 times of water, and uniformly mixing and stirring to obtain a mixed solution B for later use;
s1-3, adding water into the isobutylene-based polyethylene glycol ether, stirring and dissolving, adding hydrogen peroxide, and uniformly mixing and stirring to obtain a mixed solution C for later use;
s1-4, carrying out water bath heat preservation on the mixed solution C at 60-65 ℃, then slowly dropwise adding the mixed solution A and the mixed solution B into the dissolving solution, carrying out heat preservation for 1-2h after dropwise adding, then regulating the pH value to be neutral, and then supplementing water to regulate the solid content to be 40%.
Preferably, the dripping time of the mixed solution A in the step S1-4 is 2-3h, and the dripping time of the mixed solution B is 3-5h.
Preferably, the preparation method of the plant fiber combined starch modified material comprises the following steps:
s2-1, mixing plant fiber powder and starch, adding 2 times of water, uniformly stirring, heating to 60-70 ℃, and carrying out heat preservation and stirring treatment for 30-60min to obtain a mixture for later use;
s2-2, performing steam explosion treatment on the mixture to obtain a steam exploded material for later use;
s2-3, adding 2 times of clear water into the steam explosion material, uniformly mixing and stirring, adding an oxidant, stirring and mixing for reaction for 1-1.5h, and then carrying out suction filtration and drying to obtain the plant fiber combined starch modified material.
Preferably, the pressure of the steam explosion treatment in the step S2-2 is 2Mpa, the treatment temperature is 121 ℃, and the treatment time is 50-60S.
Preferably, the oxidant in the step S-3 is hydrogen peroxide, and the addition amount of the oxidant is 15-30% of the mass of the starch raw material.
Preferably, the polycarboxylic acid pumping agent is added in an amount of 0.8-1.5% of the total mass of the gel material in the concrete when in use.
The preparation method of the polycarboxylic acid pumping agent comprises the following steps:
(1) Mixing sodium lignin sulfonate, sodium methacrylate sulfonate and dodecyl sulfuric acid, adding water, stirring and mixing uniformly to obtain a primary mixed solution for later use;
(2) Uniformly mixing and stirring the polycarboxylic acid water reducer with the solid content of 40% and the primary mixed solution to obtain a mixture A for standby;
(3) Adding water into the plant fiber and starch modified material, uniformly mixing and stirring, adding sodium gluconate, and continuously uniformly stirring to obtain a mixture B for later use;
(4) Under the water bath condition, adding the mixture A into the rest water, uniformly stirring, then slowly adding the mixture B, and stirring while adding to obtain the polycarboxylic pumping aid.
Preferably, the water bath temperature in the step (4) is 50-60 ℃, and the time for adding the mixture B is 15-30min.
The invention provides a polycarboxylic pumping aid and a preparation process thereof, which have the advantages that compared with the prior art:
according to the invention, the polycarboxylate water reducer is taken as a mother solution, sodium lignosulfonate, sodium methallyl sulfonate and sodium dodecyl sulfate are added in a supplementing manner, so that the concrete retarding effect is effectively improved, the water reducing property of the pumping agent on the concrete is further improved through the addition of the plant fiber and starch modified material, meanwhile, the strength of the concrete is further improved while the good slump retaining property is ensured, wherein the water reducing effect on the concrete can be effectively improved through the steam explosion treatment reoxidation after the starch is semi-gelatinized, the starch and plant fiber are jointly modified, the influence of starch on the concrete fluidity is effectively reduced while the water reducing effect is enhanced, so that the slump of the pumping agent in the concrete is ensured to be more than 92% when the adding amount of the pumping agent in the concrete is 0.8-1.5% (calculated by gel component), and the subsequent strength of the concrete is effectively improved.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described in the following in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1:
1. the polycarboxylic acid water reducer with the solid content of 40 percent is prepared by the following steps:
(1) Preparing materials: 350 parts of isobutenyl polyethylene glycol ether, 25 parts of acrylic acid, 10 parts of polyethylene glycol methacrylate, 3.5 parts of L-ascorbic acid, 1.5 parts of thioglycollic acid, 3 parts of butyl acrylate and 4 parts of hydrogen peroxide;
(2) Mixing acrylic acid, polyethylene glycol methacrylate and butyl acrylate, adding 10 times of water, and uniformly stirring to obtain a mixed solution A for later use;
(3) Mixing L-ascorbic acid and thioglycollic acid, adding 40 times of water, mixing and stirring uniformly to obtain a mixed solution B for standby;
(4) Adding water into the isobutylene-based polyethylene glycol ether, stirring and dissolving, adding hydrogen peroxide, and uniformly mixing and stirring to obtain a mixed solution C for standby;
(5) And (3) carrying out water bath heat preservation on the mixed solution C at 60 ℃, then slowly dropwise adding the mixed solution A and the mixed solution B into the solution, wherein the total dropwise adding time of the mixed solution A is 2.5h, the total dropwise adding time of the mixed solution B is 4h, and after dropwise adding is completed, carrying out heat preservation for 1.5h, standing for reaction, then adopting 30% sodium hydroxide solution to adjust the pH value to be neutral, and then supplementing water to adjust the solid content to 40%, thereby obtaining the polycarboxylic acid water reducer with the solid content of 40%.
2. Preparation of modified materials:
(1) Preparation of modified material A:
s1, preparing materials: selecting coconut fiber powder with the particle size of 100-400 mu m and common corn starch, and mixing according to the mass ratio of 1:1 to obtain premix for later use;
s2, adding 2 times of water into the premix, uniformly stirring, heating to 65 ℃, and carrying out heat preservation and stirring treatment for 45min to obtain a mixture for later use;
s3, subjecting the mixture to steam explosion treatment at a high temperature of 121 ℃ for 55 seconds under the pressure of 2Mpa to obtain a steam exploded material for later use;
s4, adding 2 times of clear water into the steam explosion material, uniformly mixing and stirring, adding hydrogen peroxide accounting for 25% of the mass of the common corn starch, stirring and mixing for reaction for 1.2 hours, carrying out suction filtration, and drying at the temperature of 40 ℃ until the water content is less than or equal to 8%, thus obtaining the modified material A.
(2) Preparation of modified material B:
s1, preparing materials: selecting coconut fiber powder with the particle size of 100-400 mu m and common corn starch, and mixing according to the mass ratio of 1:1 to obtain premix for later use;
s2, adding 2 times of clear water into the premix, uniformly mixing and stirring, adding hydrogen peroxide accounting for 25% of the mass of the common corn starch, stirring and mixing for 1.2 hours, carrying out suction filtration, and drying at the temperature of 40 ℃ until the water content is less than or equal to 8%, thus obtaining the modified material B.
(3) Preparation of modified material C:
s1, preparing materials: selecting coconut fiber powder with the particle size of 100-400 mu m as a raw material;
s2, adding water with the volume being 2 times of that of the raw materials, uniformly stirring, heating to 65 ℃, and carrying out heat preservation and stirring treatment for 45min to obtain premix for later use;
s3, performing steam explosion treatment on the premix at a high temperature of 121 ℃ for 55 seconds under the pressure of 2Mpa to obtain a steam exploded material for later use;
s4, adding 2 times of clear water into the steam explosion material, uniformly mixing and stirring, adding 25% of hydrogen peroxide by mass of the raw material, stirring and mixing for reaction for 1.2 hours, carrying out suction filtration, and drying at the temperature of 40 ℃ until the water content is less than or equal to 8%, thus obtaining the modified material C.
(4) Preparation of modified material D:
s1, preparing materials: selecting coconut fiber powder with the particle size of 100-400 mu m as a raw material;
s2, adding water with the volume being 2 times of that of the raw materials, uniformly stirring, heating to 65 ℃, and carrying out heat preservation and stirring treatment for 45min to obtain premix for later use;
s3, performing steam explosion treatment on the premix at a high temperature of 121 ℃ for 55 seconds under the pressure of 2Mpa to obtain a steam exploded material for later use;
s4, adding 2 times of clear water into the steam explosion material, uniformly mixing and stirring, adding hydrogen peroxide accounting for 25% of the mass of the raw material, stirring and mixing for reaction for 1.2 hours, carrying out suction filtration, and drying at the temperature of 40 ℃ until the water content is less than or equal to 8%, thus obtaining the modified material D.
Example 2:
preparation of a pumping agent:
(1) Preparing materials: the preparation method comprises the following steps of: 25% of polycarboxylic acid water reducer with solid content of 40%, 3% of sodium lignin sulfonate, 3% of sodium methacrylate sulfonate, 1.2% of sodium dodecyl sulfate, 5% of modified material, 3% of sodium gluconate and the balance of water;
(2) Mixing sodium lignin sulfonate, sodium methacrylate sulfonate and sodium dodecyl sulfate, adding water, stirring and mixing uniformly to obtain a primary mixed solution for later use;
(3) The polycarboxylic acid water reducer with the solid content of 40 percent and the primary mixed liquid are mixed and stirred uniformly to obtain a mixture A for standby
(4) Adding water into the modified material, uniformly mixing and stirring, then adding sodium gluconate, and continuously uniformly stirring to obtain a mixture B for later use;
(5) And (3) adding the mixture A into the rest water under the water bath condition of 55 ℃, uniformly stirring, slowly adding the mixture B for 20min, and stirring while adding to obtain the polycarboxylic acid pumping agent.
The polycarboxylic acid water reducer with the solid content of 40% prepared in the above example 1 is adopted as a raw material, the different modified materials in the above example 1 and the sodium lignin sulfonate, sodium methacrylate and sodium dodecyl sulfate which are selectively added are respectively selected, and the other materials are the same, and the pumping agent of the experimental groups 1-6 is obtained by processing according to the preparation method of the pumping agent, and the pumping agent modified materials of the experimental groups 1-6 are selected as shown in the following table 1:
TABLE 1
And (3) detection:
the performance of the pumping agents prepared in the above experimental groups 1-6 was examined:
experimental raw material selection:
and (3) cement: conch P.O42.5 cement is;
fine aggregate: middle sand with fineness modulus of 2.7;
coarse aggregate: continuous graded broken stone with the grain diameter of 5 mm-20 mm;
the amount of the pumping agent added was set to 1.0% (calculated as gel material), and the following concrete in the proportion of table 2 was designed:
TABLE 2
The concrete properties of the above C-0, C-1, C-2, C-3, C-4, C-5, C-6 were tested according to GB 8076-2008, and the specific results are shown in tables 3 and 4 below:
TABLE 3 Table 3
TABLE 4 Table 4
From the test results shown in tables 3 and 4, the addition of the pumping agent prepared in experiment group 1 can effectively improve the slump retaining effect of the concrete and further improve the early strength of the concrete.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The polycarboxylic acid pumping agent is characterized by being prepared from the following raw materials in percentage by mass: 10-40% of polycarboxylic acid water reducer with solid content of 40%, 2-4% of sodium lignin sulfonate, 2-4% of sodium methacrylate sulfonate, 1-1.5% of sodium dodecyl sulfate, 3-7% of plant fiber combined starch modified material, 2-4% of sodium gluconate and the balance of water;
wherein the plant fiber and starch combined modified material is obtained by mixing plant fiber powder with the grain diameter of 100-400 mu m and starch with the mass ratio of 1:1-2, gelatinizing, performing steam explosion treatment, and performing post-oxidation modification.
2. The polycarboxylic acid pumping aid according to claim 1, wherein the solid content of the polycarboxylic acid water reducer with the solid content of 40% comprises the following raw materials in parts by mass: 320-380 parts of isobutenyl polyethylene glycol ether, 20-30 parts of acrylic acid, 8-12 parts of methacrylic acid polyethylene glycol ester, 2-5 parts of L-ascorbic acid, 1-2 parts of thioglycollic acid, 1-4 parts of butyl acrylate and 3-5 parts of hydrogen peroxide.
3. The polycarboxylic acid-based pumping aid according to claim 2, wherein the preparation method of the polycarboxylic acid-based water reducing agent with the solid content of 40% comprises the following steps:
s1-1, mixing acrylic acid, polyethylene glycol methacrylate and butyl acrylate, adding 10 times of water, and uniformly stirring to obtain a mixed solution A for later use;
s1-2, mixing L-ascorbic acid and thioglycollic acid, adding 40 times of water, and uniformly mixing and stirring to obtain a mixed solution B for later use;
s1-3, adding water into the isobutylene-based polyethylene glycol ether, stirring and dissolving, adding hydrogen peroxide, and uniformly mixing and stirring to obtain a mixed solution C for later use;
s1-4, carrying out water bath heat preservation on the mixed solution C at 60-65 ℃, then slowly dropwise adding the mixed solution A and the mixed solution B into the dissolving solution, carrying out heat preservation for 1-2h after dropwise adding, then regulating the pH value to be neutral, and then supplementing water to regulate the solid content to be 40%.
4. A polycarboxylic acid-based pumping agent according to claim 3, characterized in that: and in the step S1-4, the dropwise adding time of the mixed solution A is 2-3h, and the dropwise adding time of the mixed solution B is 3-5h.
5. A polycarboxylic acid-based pumping agent according to claim 1, characterized in that: the preparation method of the plant fiber combined starch modified material comprises the following steps:
s2-1, mixing plant fiber powder and starch, adding 2 times of water, uniformly stirring, heating to 60-70 ℃, and carrying out heat preservation and stirring treatment for 30-60min to obtain a mixture for later use;
s2-2, performing steam explosion treatment on the mixture to obtain a steam exploded material for later use;
s2-3, adding 2 times of clear water into the steam explosion material, uniformly mixing and stirring, adding an oxidant, stirring and mixing for reaction for 1-1.5h, and then carrying out suction filtration and drying to obtain the plant fiber combined starch modified material.
6. A polycarboxylic acid-based pumping agent according to claim 5, characterized in that: the pressure of the steam explosion treatment in the step S2-2 is 2Mpa, the treatment temperature is 121 ℃, and the treatment time is 50-60S.
7. A polycarboxylic acid-based pumping agent according to claim 5, characterized in that: the oxidant in the step S-3 is hydrogen peroxide, and the addition amount of the oxidant is 15-30% of the mass of the starch raw material.
8. A polycarboxylic acid-based pumping agent according to claim 1, characterized in that: the addition amount of the polycarboxylic acid pumping agent is 0.8-1.5% of the total mass of the gel material in the concrete when the polycarboxylic acid pumping agent is used.
9. A process for the preparation of the polycarboxylic acid-based pumping aid according to any of claims 1 to 7, comprising the steps of:
(1) Mixing sodium lignin sulfonate, sodium methacrylate sulfonate and dodecyl sulfuric acid, adding water, stirring and mixing uniformly to obtain a primary mixed solution for later use;
(2) Uniformly mixing and stirring the polycarboxylic acid water reducer with the solid content of 40% and the primary mixed solution to obtain a mixture A for standby;
(3) Adding water into the plant fiber and starch modified material, uniformly mixing and stirring, adding sodium gluconate, and continuously uniformly stirring to obtain a mixture B for later use;
(4) Under the water bath condition, adding the mixture A into the rest water, uniformly stirring, then slowly adding the mixture B, and stirring while adding to obtain the polycarboxylic pumping aid.
10. The method for producing a polycarboxylic acid-based pumping agent according to claim 9, characterized in that: the water bath temperature in the step (4) is 50-60 ℃, and the adding time of the mixture B is 15-30min.
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| US20030172850A1 (en) * | 2002-03-13 | 2003-09-18 | Byong-Wa Chun | Beneficiated water reducing compositions |
| CN103241978A (en) * | 2013-05-29 | 2013-08-14 | 上海华联建筑外加剂厂有限公司 | polycarboxylic acid-type high-water reducing and slump resistant early strength pumping aid |
| CN111961260A (en) * | 2020-08-28 | 2020-11-20 | 山东大学 | Formula of plant fiber/lignin/starch composite material and preparation method thereof |
| CN111978004A (en) * | 2020-07-09 | 2020-11-24 | 浙江五龙新材股份有限公司 | Polycarboxylic acid type efficient pumping agent and application thereof |
| WO2022142125A1 (en) * | 2020-12-29 | 2022-07-07 | 江苏尼高科技有限公司 | Viscosity reduction type concrete polycarboxylic acid water-reducing agent and preparation method therefor |
| CN115974451A (en) * | 2023-01-30 | 2023-04-18 | 甘肃金凯宁工贸集团有限公司 | Novel efficient environment-friendly water reducing agent and preparation method thereof |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030172850A1 (en) * | 2002-03-13 | 2003-09-18 | Byong-Wa Chun | Beneficiated water reducing compositions |
| CN103241978A (en) * | 2013-05-29 | 2013-08-14 | 上海华联建筑外加剂厂有限公司 | polycarboxylic acid-type high-water reducing and slump resistant early strength pumping aid |
| CN111978004A (en) * | 2020-07-09 | 2020-11-24 | 浙江五龙新材股份有限公司 | Polycarboxylic acid type efficient pumping agent and application thereof |
| CN111961260A (en) * | 2020-08-28 | 2020-11-20 | 山东大学 | Formula of plant fiber/lignin/starch composite material and preparation method thereof |
| WO2022142125A1 (en) * | 2020-12-29 | 2022-07-07 | 江苏尼高科技有限公司 | Viscosity reduction type concrete polycarboxylic acid water-reducing agent and preparation method therefor |
| CN115974451A (en) * | 2023-01-30 | 2023-04-18 | 甘肃金凯宁工贸集团有限公司 | Novel efficient environment-friendly water reducing agent and preparation method thereof |
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