CN117263560A - Early-strength cement grinding aid and preparation method thereof - Google Patents
Early-strength cement grinding aid and preparation method thereof Download PDFInfo
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- CN117263560A CN117263560A CN202311214259.1A CN202311214259A CN117263560A CN 117263560 A CN117263560 A CN 117263560A CN 202311214259 A CN202311214259 A CN 202311214259A CN 117263560 A CN117263560 A CN 117263560A
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- 239000004568 cement Substances 0.000 title claims abstract description 76
- 238000000227 grinding Methods 0.000 title claims abstract description 64
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 239000002245 particle Substances 0.000 claims abstract description 74
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 54
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 47
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 27
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 18
- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 claims abstract description 16
- 229910000403 monosodium phosphate Inorganic materials 0.000 claims abstract description 16
- 235000019799 monosodium phosphate Nutrition 0.000 claims abstract description 16
- AJPJDKMHJJGVTQ-UHFFFAOYSA-M sodium dihydrogen phosphate Chemical compound [Na+].OP(O)([O-])=O AJPJDKMHJJGVTQ-UHFFFAOYSA-M 0.000 claims abstract description 16
- 239000005913 Maltodextrin Substances 0.000 claims abstract description 15
- 229920002774 Maltodextrin Polymers 0.000 claims abstract description 15
- 229940035034 maltodextrin Drugs 0.000 claims abstract description 15
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract description 12
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 12
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000002562 thickening agent Substances 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims description 41
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 36
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 16
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 16
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 16
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 16
- 239000002202 Polyethylene glycol Substances 0.000 claims description 15
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 15
- 239000003638 chemical reducing agent Substances 0.000 claims description 15
- 229920001223 polyethylene glycol Polymers 0.000 claims description 15
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 14
- 239000000839 emulsion Substances 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 13
- 229920005646 polycarboxylate Polymers 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- 238000010008 shearing Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 239000011859 microparticle Substances 0.000 claims description 10
- 229920000642 polymer Polymers 0.000 claims description 7
- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims description 6
- 229920000223 polyglycerol Polymers 0.000 claims description 6
- 238000002791 soaking Methods 0.000 claims description 6
- 239000000661 sodium alginate Substances 0.000 claims description 6
- 235000010413 sodium alginate Nutrition 0.000 claims description 6
- 229940005550 sodium alginate Drugs 0.000 claims description 6
- 230000001804 emulsifying effect Effects 0.000 claims description 4
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 4
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 4
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 4
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 4
- 239000005416 organic matter Substances 0.000 claims description 4
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims description 3
- 229920002401 polyacrylamide Polymers 0.000 claims description 3
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims description 3
- 230000001476 alcoholic effect Effects 0.000 claims description 2
- QZUNHWGQSGFRAR-UHFFFAOYSA-N dodecyl octadecanoate;sodium Chemical compound [Na].CCCCCCCCCCCCCCCCCC(=O)OCCCCCCCCCCCC QZUNHWGQSGFRAR-UHFFFAOYSA-N 0.000 claims description 2
- 150000002894 organic compounds Chemical class 0.000 claims description 2
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims 1
- 239000000378 calcium silicate Substances 0.000 abstract description 16
- 229910052918 calcium silicate Inorganic materials 0.000 abstract description 16
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 abstract description 16
- 239000013078 crystal Substances 0.000 abstract description 13
- 230000015572 biosynthetic process Effects 0.000 abstract description 5
- 239000000404 calcium aluminium silicate Substances 0.000 abstract description 4
- 235000012215 calcium aluminium silicate Nutrition 0.000 abstract description 4
- WNCYAPRTYDMSFP-UHFFFAOYSA-N calcium aluminosilicate Chemical compound [Al+3].[Al+3].[Ca+2].[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O WNCYAPRTYDMSFP-UHFFFAOYSA-N 0.000 abstract description 4
- 229940078583 calcium aluminosilicate Drugs 0.000 abstract description 4
- 239000000243 solution Substances 0.000 description 24
- 230000000052 comparative effect Effects 0.000 description 16
- 230000000694 effects Effects 0.000 description 11
- 239000010419 fine particle Substances 0.000 description 11
- 239000007864 aqueous solution Substances 0.000 description 8
- 239000011734 sodium Substances 0.000 description 8
- 229910052708 sodium Inorganic materials 0.000 description 8
- 239000000843 powder Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 6
- 230000001965 increasing effect Effects 0.000 description 5
- 238000001556 precipitation Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000004090 dissolution Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- KBAFDSIZQYCDPK-UHFFFAOYSA-M sodium;octadecane-1-sulfonate Chemical compound [Na+].CCCCCCCCCCCCCCCCCCS([O-])(=O)=O KBAFDSIZQYCDPK-UHFFFAOYSA-M 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 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 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007853 buffer solution Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000003508 chemical denaturation Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- BTURAGWYSMTVOW-UHFFFAOYSA-M sodium dodecanoate Chemical compound [Na+].CCCCCCCCCCCC([O-])=O BTURAGWYSMTVOW-UHFFFAOYSA-M 0.000 description 1
- 229940082004 sodium laurate Drugs 0.000 description 1
- 239000004094 surface-active agent 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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
- C04B7/42—Active ingredients added before, or during, the burning process
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/48—Clinker treatment
- C04B7/52—Grinding ; After-treatment of ground cement
-
- 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
- C04B2103/52—Grinding aids; Additives added during grinding
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
Abstract
The invention provides an early-strength cement grinding aid which comprises the following components in parts by weight: 16-28 parts of silicon dioxide particles, 8-14 parts of aluminum oxide particles, 14-32 parts of calcium carbonate particles, 0.2-0.5 part of particle structure control agent, 0.5-2 parts of thickening agent, 1-10 parts of maltodextrin, 1-4 parts of sodium dihydrogen phosphate, 2-6 parts of disodium hydrogen phosphate, 20-50 parts of alcohol organic matters and 70-100 parts of water. Compared with the prior art, the particle structure control agent is arranged, so that tiny and dispersed hydrated calcium silicate crystal nucleus and hydrated calcium aluminosilicate crystal nucleus can be formed, the formation of cement hydrated calcium silicate and hydrated calcium aluminosilicate crystal is promoted, and the early strength of cement is greatly improved; in addition, the invention also provides a preparation method of the early-strength cement grinding aid.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to an early-strength cement grinding aid and a preparation method thereof.
Background
In the cement production process, cement grinding is the link with the greatest power consumption, and one of the most effective means for reducing the production cost, saving the energy and improving the grinding effect is to add a small amount of cement grinding aid in the grinding process. The grinding aid can obviously reduce the surface energy of the powder, improve the grinding efficiency, improve the cement quality and the like, and at present, the grinding aid becomes a hot spot for research and development in the field of engineering materials, and has very important theoretical significance and wide application prospect.
In the cement grinding process, the triethanolamine which is taken as the main raw material of the grinding aid in the prior art has good grinding aid effect and early strength effect, so that the triethanolamine which is taken as the early strength grinding aid is widely used in production. However, in industrial practice, the inventor finds that the cement obtained by adding the early strength grinding aid prepared by the triethanolamine has some adaptability problems, such as insufficient early strength, poor adaptability to water reducer and the influence on the physical properties of the cement such as standard consistency, setting time and the like in the use process; the early strength cement grinding aid prepared from triethanolamine is used for improving the early strength of the prepared cement.
Therefore, the invention provides an early-strength cement grinding aid and a preparation method thereof.
Disclosure of Invention
The invention provides an early-strength cement grinding aid and a preparation method thereof, and aims to solve the problems that in the prior art, early-strength cement grinding aid is unstable, physical properties of cement are affected, adaptability with a water reducer is poor and the like.
The aim of the invention can be achieved by the following technical scheme:
the early-strength cement grinding aid comprises the following components in parts by weight:
preferably, the particle size of the silica fine particles is in the range of 100 to 1000nm, respectively.
Preferably, the alumina fine particles have a particle diameter in the range of 100 to 1000nm.
Preferably, the particle size of the calcium carbonate microparticles ranges from 100 to 1000nm.
It should be noted that: in the early strength grinding aid, the particle size of the silicon dioxide particles, the aluminum oxide particles and the calcium carbonate particles is 100-1000nm. Wherein, the weight ratio of the silicon dioxide particles to the aluminum oxide particles to the calcium carbonate particles is 2:1:4-2:1:1, preferably 2:1:2.
Preferably, the particle structure controlling agent is a mixture of a first composition and a second composition, wherein the first composition is one or any two or three of sodium polyacrylate, polyacrylamide and polycarboxylate water reducer polymer, and the second composition is one or any two or more of sodium dodecyl-octadecanoate. The mass ratio of the polymer to the linear sodium alkanoate is 1:1-4:1. The particle structure control agent effectively controls the crystal formation process when forming calcium silicate hydrate and calcium silicate hydrate crystals to form crystals with small particle size and uniform dispersion, thereby providing a plurality of crystal nuclei in the cement hydration process and accelerating the formation speed of the calcium silicate hydrate and calcium silicate hydrate crystals.
Preferably, the thickener is at least one of hydroxypropyl methylcellulose, sodium alginate and sodium carboxymethyl cellulose or a mixture of any two or a mixture of the three. The thickener increases solution viscosity to prevent precipitation of silica particles, alumina particles, and calcium carbonate particles, and the maltodextrin is adsorbed on the surfaces of the silica particles, alumina particles, and calcium carbonate particles to prevent aggregation between particles, thereby stabilizing the particles.
Preferably, the alcohol organic matter is at least one of ethylene glycol, polyethylene glycol, glycerol and polymerized glycerol or a mixture of any two or any three or a mixture of four.
Preferably, when the alcohol organic matter comprises polyethylene glycol, the molecular weight of the polyethylene glycol ranges from 200 to 2000;
when the alcoholic organic compound comprises a polyglycerol, the polyglycerol is a polymer of any form having a molecular weight in the range of from 200 to 1000. Wherein, the polyethylene glycol is polymer with molecular weight of 200-2000 and the polymerized glycerol is polymer with molecular weight of 200-1000. The alcohol organic matters have good grinding effect on cement.
Preferably, the pH of the early strength cement grinding aid solution is in the range of 6-8. By adjusting the proportion of the sodium dihydrogen phosphate to the disodium hydrogen phosphate, the pH range of the early-strength cement grinding aid solution is kept, and the silicon dioxide particles, the aluminum oxide particles and the calcium carbonate particles are not hydrolyzed and are stably present in the solution.
The invention also provides a preparation method of the early-strength cement grinding aid, which is characterized by comprising the following steps of:
firstly, dissolving 0.5-2 parts of thickener, 1-10 parts of maltodextrin, 1-4 parts of sodium dihydrogen phosphate and 2-6 parts of disodium hydrogen phosphate in 70-100 parts of water, and soaking for at least 12 hours to obtain a soaking solution;
secondly, taking 16-28 parts of silicon dioxide particles, 8-14 parts of aluminum oxide particles and 14-32 parts of calcium carbonate particles, respectively placing the silicon dioxide particles, the aluminum oxide particles and the calcium carbonate particles in a mixer for uniform mixing, adding the mixture into the soaking solution in the first step, and emulsifying the mixture for 30 minutes at the rotating speed of 5000-12000rpm by using a high-speed shearing machine to obtain a homogeneous emulsion;
and thirdly, adding 0.2-0.5 part of particle structure control agent and 20-50 parts of alcohol organic matters into the homogenized emulsion in the second step, and stirring to form a stable solution to obtain the early-strength cement grinding aid solution.
As described above, the early-strength cement grinding aid and the preparation method thereof have the following beneficial effects:
compared with the prior art, the early strength cement grinding aid provided by the invention has the advantages that the early strength agent component adopts the silicon dioxide particles, the aluminum oxide particles and the calcium carbonate particles, the silicon dioxide particles, the aluminum oxide particles, the calcium carbonate particles and other particles are rapidly dissolved in the cement mixture under the mixing of a certain proportion, and the tiny and dispersed calcium silicate hydrate crystal nuclei and calcium silicate hydrate crystal nuclei are formed under the action of the particle structure control agent, so that the formation of cement calcium silicate hydrate and calcium silicate hydrate crystals is promoted, and the effect of greatly improving the early strength of cement is achieved. In the cement grinding process, alcohol organic molecules are used as a surfactant to positively grind cement, and the microparticles used in the invention are uniformly dispersed around cement particles, so that the distance between the cement particles is increased, the cement particles are prevented from agglomerating again, the grinding of cement is effectively promoted, the fineness of the cement is reduced, and the specific surface area is increased. Maltodextrin is uniformly dispersed and adsorbed around the silica microparticles, alumina microparticles and calcium carbonate microparticles to prevent agglomeration among the microparticles, and the thickener molecules increase the solution viscosity, thus preventing precipitation of the microparticles and stabilizing the microparticles in the solution. The pH value of the buffer solution of sodium dihydrogen phosphate and disodium hydrogen phosphate is kept stable between 6 and 8, and the phenomena of precipitation and the like caused by the chemical denaturation of silicon dioxide particles, aluminum oxide particles and calcium carbonate particles through hydrolysis, dissolution and the like caused by the pH change of the solution are prevented. The early strength cement grinding aid of the invention is doped, the early strength (1 day) is relatively increased by 15-25%, and the effect is obviously improved.
The invention is further described below in connection with the following detailed description.
Detailed Description
In order to describe the advantages of the early-strength cement grinding aid and the preparation method thereof provided by the embodiment of the present invention in detail, the present invention will be described below using specific examples. Additionally, the following specific examples are set forth to illustrate the present invention, and those skilled in the art will readily appreciate that the present invention provides additional advantages and benefits.
Example 0
In the cement grinding process, no grinding aid is added to serve as blank cement.
Example 1
0.5 part of sodium carboxymethyl cellulose, 10 parts of maltodextrin, 1 part of sodium dihydrogen phosphate and 6 parts of disodium hydrogen phosphate are dissolved in 100 parts of water, and the mixture is left for more than 12 hours, so that the sodium carboxymethyl cellulose is completely dissolved in the water.
16 parts of silica particles, 8 parts of alumina particles and 32 parts of calcium carbonate particles were added to the aqueous solution, and the mixture was emulsified with a high-speed shearing machine at 5000rpm for 30 minutes to obtain a homogeneous emulsion. And then adding 0.1 part of sodium polyacrylate, 0.1 part of sodium laurate, 15 parts of ethylene glycol and 25 parts of polyethylene glycol, mixing and stirring until a stable solution is formed, and obtaining the early-strength cement grinding aid.
Example 2
1 part of hydroxypropyl methylcellulose, 3 parts of maltodextrin, 2 parts of sodium dihydrogen phosphate and 4 parts of disodium hydrogen phosphate are dissolved in 80 parts of water, and the mixture is left for more than 12 hours, so that the hydroxypropyl methylcellulose is completely dissolved in the water.
To the aqueous solution, 20 parts of silica fine particles, 10 parts of alumina fine particles and 30 parts of calcium carbonate fine particles were added, and the mixture was emulsified with a high-speed shearing machine at 7000rpm for 30 minutes to obtain a homogeneous emulsion. And then adding 0.2 part of polycarboxylate water reducer, 0.1 part of sodium stearyl, 25 parts of polyglycerol and 25 parts of polyethylene glycol, mixing and stirring to form a stable solution, thus obtaining the early-strength cement grinding aid.
Example 3
0.8 part of sodium carboxymethyl cellulose, 2 parts of maltodextrin, 3 parts of sodium dihydrogen phosphate and 3 parts of disodium hydrogen phosphate are dissolved in 85 parts of water, and the mixture is left for more than 12 hours, so that the sodium carboxymethyl cellulose is completely dissolved in the water.
22 parts of silica particles, 11 parts of alumina particles and 22 parts of calcium carbonate particles were added to the aqueous solution, and the mixture was emulsified by a high-speed shearing machine at 8000rpm for 30 minutes to obtain a homogeneous emulsion. And then adding 0.2 part of polycarboxylate water reducer, 0.1 part of sodium stearyl, 15 parts of polyethylene glycol and 25 parts of glycerol, mixing and stirring to form a stable solution, thus obtaining the early-strength cement grinding aid.
Example 4
2 parts of sodium alginate, 1 part of maltodextrin, 4 parts of sodium dihydrogen phosphate and 2 parts of disodium hydrogen phosphate are dissolved in 70 parts of water and left for more than 12 hours, so that the sodium alginate is completely dissolved in the water.
28 parts of silica particles, 14 parts of alumina particles and 14 parts of calcium carbonate particles were added to the aqueous solution, and the mixture was emulsified with a high-speed shearing machine at 12000rpm for 30 minutes to obtain a homogeneous emulsion. And then adding 0.2 part of polycarboxylate water reducer, 0.1 part of sodium stearyl, 10 parts of ethylene glycol and 10 parts of glycerol, mixing and stirring until a stable solution is formed, thus obtaining the early-strength cement grinding aid.
Example 5
1.5 parts of sodium alginate, 4 parts of maltodextrin, 2 parts of sodium dihydrogen phosphate and 5 parts of disodium hydrogen phosphate are dissolved in 80 parts of water, and the mixture is left for more than 12 hours, so that the sodium alginate is completely dissolved in the water.
The aqueous solution was added with 22 parts of silica particles, 11 parts of alumina particles and 22 parts of calcium carbonate particles, and the mixture was emulsified with a high-speed shearing machine at 10000rpm for 30 minutes to obtain a homogeneous emulsion. And then adding 0.2 part of polycarboxylate water reducer, 0.2 part of polyacrylamide, 0.1 part of sodium stearyl, 15 parts of ethylene glycol and 25 parts of polymerized glycerol, mixing and stirring until a stable solution is formed, and obtaining the early-strength cement grinding aid.
Comparative example 1
0.8 part of sodium carboxymethyl cellulose, 5 parts of maltodextrin, 3 parts of sodium dihydrogen phosphate and 3 parts of disodium hydrogen phosphate are dissolved in 85 parts of water, and the mixture is left for more than 12 hours, so that the sodium carboxymethyl cellulose is completely dissolved in the water.
And adding 0.2 part of polycarboxylate water reducer, 0.1 part of sodium stearyl sulfonate, 55 parts of triethanolamine, 15 parts of polyethylene glycol and 25 parts of glycerol into the aqueous solution, mixing and stirring to form a stable solution, and obtaining the comparative early-strength cement grinding aid.
Comparative example 2
0.8 part of sodium carboxymethyl cellulose, 5 parts of maltodextrin, 3 parts of sodium dihydrogen phosphate and 3 parts of disodium hydrogen phosphate are dissolved in 85 parts of water, and the mixture is left for more than 12 hours, so that the sodium carboxymethyl cellulose is completely dissolved in the water.
Adding 0.2 part of polycarboxylate water reducer, 0.1 part of sodium stearyl sulfonate and 55 parts of calcium silicate hydrate synthesized by a precipitation method into the solution, and emulsifying for 30 minutes by a high-speed shearing machine at a rotating speed of 8000rpm to obtain a homogeneous emulsion. And then adding 0.2 part of polycarboxylate water reducer, 0.1 part of sodium stearyl, 15 parts of polyethylene glycol and 25 parts of glycerol, mixing and stirring to form a stable solution, thus obtaining the comparative early-strength cement grinding aid.
Comparative example 3
0.8 part of sodium carboxymethyl cellulose, 5 parts of maltodextrin, 3 parts of sodium dihydrogen phosphate and 3 parts of disodium hydrogen phosphate are dissolved in 85 parts of water, and the mixture is left for more than 12 hours, so that the sodium carboxymethyl cellulose is completely dissolved in the water.
And adding 0.2 part of polycarboxylate water reducer, 0.1 part of sodium stearyl sulfonate and 55 parts of calcium silicate hydrate synthesized by a precipitation method into the solution, and emulsifying for 30 minutes by a high-speed shearing machine at the rotating speed of 8000rpm to obtain a homogeneous emulsion. And then adding 0.2 part of polycarboxylate water reducer, 0.1 part of sodium stearyl, 15 parts of polyethylene glycol and 25 parts of glycerol, mixing and stirring to form a stable solution, thus obtaining the comparative early-strength cement grinding aid.
Comparative example 4
0.8 part of sodium carboxymethyl cellulose, 5 parts of maltodextrin, 3 parts of sodium dihydrogen phosphate and 3 parts of disodium hydrogen phosphate are dissolved in 85 parts of water, and the mixture is left for more than 12 hours, so that the sodium carboxymethyl cellulose is completely dissolved in the water.
22 parts of silica particles, 11 parts of alumina particles and 22 parts of calcium carbonate particles were added to the aqueous solution, and the mixture was emulsified by a high-speed shearing machine at 8000rpm for 30 minutes to obtain a homogeneous emulsion. And adding 15 parts of polyethylene glycol and 25 parts of glycerol, mixing and stirring to form a stable solution, thus obtaining the comparative early-strength cement grinding aid.
Comparative example 5
0.8 part of sodium carboxymethyl cellulose, 5 parts of maltodextrin, 3 parts of sodium dihydrogen phosphate and 3 parts of disodium hydrogen phosphate are dissolved in 85 parts of water, and the mixture is left for more than 12 hours, so that the sodium carboxymethyl cellulose is completely dissolved in the water.
22 parts of silicon dioxide powder, 11 parts of aluminum oxide powder and 22 parts of calcium carbonate powder are added into the aqueous solution, and the mixture is emulsified for 30 minutes by a high-speed shearing machine at 8000rpm to obtain a homogeneous emulsion. And then adding 0.2 part of polycarboxylate water reducer, 0.1 part of sodium stearyl, 15 parts of polyethylene glycol and 25 parts of glycerol, mixing and stirring to form a stable solution, thus obtaining the comparative early-strength cement grinding aid.
TABLE 1 Cement preparation method for example 0, examples 1-5 and comparative examples 1-5
Table 2. Blank, examples A1-5, comparative examples B1-5 cement grinding performance and strength comparison results are shown below.
As can be seen from the data in Table 2, the early strength cement grinding aid provided in examples 1-5 not only has good grinding effect, but also has good early strength effect, such as the highest increase in 1 day strength of 3.6MPa, the highest increase in 3 day strength of 5.9MPa, and the highest increase in 28 day strength of 4.8MPa. Among them, the early strength effect of example 3 was best when the weight part ratio of silica fine particles, alumina fine particles, and calcium carbonate fine particles in examples 1 to 4 was changed from 2:1:4 to 2:1:1. Namely, the early strength improving effect is optimal when the mass ratio of the silica particles to the alumina particles to the calcium carbonate particles is 2:1:2. The early strength increases are evident in examples 1-5 of the present invention compared to comparative examples 1-3 when triethanolamine, hydrated calcium silicate, hydrated calcium alumino silicate are used as early strength agents.
In comparative example 4, the particle structure controlling agent was not used, and the crystal nucleus structure of hydrated calcium silicate and hydrated calcium aluminosilicate generated by dissolution of silica fine particles, alumina fine particles and calcium carbonate fine particles was not controlled, and small and dispersed crystal nuclei were not formed, and the early strength of cement was affected, resulting in an early strength increasing effect of only 60% of that of example 4 for 1 day. In comparative example 5, silica powder, alumina powder and calcium carbonate powder having particle diameters in the range of several tens um were used, and since the dissolution rate of the powder in cement was slow, the formation rate of calcium silicate hydrate and calcium silicate hydrate nuclei was slow, and the effect of increasing early strength was not remarkable.
Table 3. Blank, examples A1-5, comparative examples B1-5 cement standard consistencies, setting times, and sand flow comparison results are set forth below.
As can be seen from the data in Table 3, the early-strength cement grinding aid provided in examples 1-6 has good water reducer compatibility with cement standard consistency variation value within + -0.2%, setting time variation within + -10 min and cement sand fluidity variation within + -10 mm.
In addition, by adjusting the ratio of sodium dihydrogen phosphate to disodium hydrogen phosphate, the pH of the early-strength cement grinding aid solution of the present invention can be ensured to be in the range of 6 to 8, and the pH can be ensured to be easily modified by too small or too large of the pH, so that the early-strength cement grinding aid can be further stably produced.
In summary, the present invention effectively overcomes the disadvantages of the prior art and has high industrial utility value.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (10)
1. The early-strength cement grinding aid is characterized by comprising the following components in parts by weight:
2. the early strength cement grinding aid of claim 1, wherein: the particle size of the silicon dioxide particles is 100-1000nm.
3. The early strength cement grinding aid of claim 1, wherein: the particle size of the alumina microparticles ranges from 100 nm to 1000nm.
4. The early strength cement grinding aid of claim 1, wherein: the particle size of the calcium carbonate microparticles ranges from 100 nm to 1000nm.
5. The early strength cement grinding aid of claim 1, wherein: the particle structure control agent is a mixture of a first composition and a second composition, wherein the first composition is one or a mixture of any two or three of sodium polyacrylate, polyacrylamide and polycarboxylate water reducer polymer, and the second composition is one or a combination of any two or more of sodium dodecyl-octadecanoate.
6. The early strength cement grinding aid of claim 1, wherein: the thickener is at least one or a mixture of any two or a mixture of the three of hydroxypropyl methylcellulose, sodium alginate and sodium carboxymethyl cellulose.
7. The early strength cement grinding aid of claim 1, wherein: the alcohol organic matter is at least one of glycol, polyethylene glycol, glycerol and polyglycerol or a mixture of any two or a mixture of any three or a mixture of the four.
8. The early strength cement grinding aid of claim 7, wherein: when the alcohol organic matter comprises polyethylene glycol, the molecular weight of the polyethylene glycol ranges from 200 to 2000;
when the alcoholic organic compound comprises a polyglycerol, the polyglycerol is a polymer of any form having a molecular weight in the range of from 200 to 1000.
9. The early strength cement grinding aid of claim 1, wherein: the pH range of the early strength cement grinding aid solution is 6-8.
10. A method of preparing an early strength cement grinding aid according to any one of claims 1 to 9, comprising the steps of:
firstly, dissolving 0.5-2 parts of thickener, 1-10 parts of maltodextrin, 1-4 parts of sodium dihydrogen phosphate and 2-6 parts of disodium hydrogen phosphate in 70-100 parts of water, and soaking for at least 12 hours to obtain a soaking solution;
secondly, taking 16-28 parts of silicon dioxide particles, 8-14 parts of aluminum oxide particles and 14-32 parts of calcium carbonate particles, respectively placing the silicon dioxide particles, the aluminum oxide particles and the calcium carbonate particles in a mixer for uniform mixing, adding the mixture into the soaking solution in the first step, and emulsifying the mixture for 30 minutes at the rotating speed of 5000-12000rpm by using a high-speed shearing machine to obtain a homogeneous emulsion;
and thirdly, adding 0.2-0.5 part of particle structure control agent and 20-50 parts of alcohol organic matters into the homogenized emulsion in the second step, and stirring to form a stable solution to obtain the early-strength cement grinding aid solution.
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