CN113816630A - Cement grinding aid and preparation method and application thereof - Google Patents
Cement grinding aid and preparation method and application thereof Download PDFInfo
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- CN113816630A CN113816630A CN202111191118.3A CN202111191118A CN113816630A CN 113816630 A CN113816630 A CN 113816630A CN 202111191118 A CN202111191118 A CN 202111191118A CN 113816630 A CN113816630 A CN 113816630A
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- grinding aid
- cement
- parts
- cement grinding
- sodium tripolyphosphate
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- 239000004568 cement Substances 0.000 title claims abstract description 182
- 238000000227 grinding Methods 0.000 title claims abstract description 165
- 238000002360 preparation method Methods 0.000 title abstract description 16
- 150000003077 polyols Chemical class 0.000 claims description 50
- 229920005862 polyol Polymers 0.000 claims description 48
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 48
- 239000011259 mixed solution Substances 0.000 claims description 28
- 239000011575 calcium Substances 0.000 claims description 26
- 229910052791 calcium Inorganic materials 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 25
- 229920005551 calcium lignosulfonate Polymers 0.000 claims description 22
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 claims description 19
- 230000008569 process Effects 0.000 claims description 19
- HXKKHQJGJAFBHI-UHFFFAOYSA-N 1-aminopropan-2-ol Chemical compound CC(O)CN HXKKHQJGJAFBHI-UHFFFAOYSA-N 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 239000002518 antifoaming agent Substances 0.000 claims description 16
- RYAGRZNBULDMBW-UHFFFAOYSA-L calcium;3-(2-hydroxy-3-methoxyphenyl)-2-[2-methoxy-4-(3-sulfonatopropyl)phenoxy]propane-1-sulfonate Chemical compound [Ca+2].COC1=CC=CC(CC(CS([O-])(=O)=O)OC=2C(=CC(CCCS([O-])(=O)=O)=CC=2)OC)=C1O RYAGRZNBULDMBW-UHFFFAOYSA-L 0.000 claims description 9
- 239000002904 solvent Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 19
- 238000004519 manufacturing process Methods 0.000 abstract description 14
- 206010016807 Fluid retention Diseases 0.000 abstract description 8
- 230000007613 environmental effect Effects 0.000 abstract description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 4
- -1 alcohol amine Chemical class 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 22
- 230000000052 comparative effect Effects 0.000 description 21
- 239000000463 material Substances 0.000 description 10
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 239000000843 powder Substances 0.000 description 6
- 239000002023 wood Substances 0.000 description 6
- 238000005265 energy consumption Methods 0.000 description 5
- 230000006872 improvement Effects 0.000 description 5
- 230000002195 synergetic effect Effects 0.000 description 5
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 4
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 2
- 235000013379 molasses Nutrition 0.000 description 2
- 230000000979 retarding effect Effects 0.000 description 2
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- CBOCVOKPQGJKKJ-UHFFFAOYSA-L Calcium formate Chemical compound [Ca+2].[O-]C=O.[O-]C=O CBOCVOKPQGJKKJ-UHFFFAOYSA-L 0.000 description 1
- FBPFZTCFMRRESA-FSIIMWSLSA-N D-Glucitol Natural products OC[C@H](O)[C@H](O)[C@@H](O)[C@H](O)CO FBPFZTCFMRRESA-FSIIMWSLSA-N 0.000 description 1
- LEVWYRKDKASIDU-IMJSIDKUSA-N L-cystine Chemical compound [O-]C(=O)[C@@H]([NH3+])CSSC[C@H]([NH3+])C([O-])=O LEVWYRKDKASIDU-IMJSIDKUSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 1
- SLINHMUFWFWBMU-UHFFFAOYSA-N Triisopropanolamine Chemical compound CC(O)CN(CC(C)O)CC(C)O SLINHMUFWFWBMU-UHFFFAOYSA-N 0.000 description 1
- 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 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229940044172 calcium formate Drugs 0.000 description 1
- 239000004281 calcium formate Substances 0.000 description 1
- 235000019255 calcium formate Nutrition 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229960003067 cystine Drugs 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000006355 external stress Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 230000003334 potential effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000011863 silicon-based powder Substances 0.000 description 1
- 239000001632 sodium acetate Substances 0.000 description 1
- 235000017281 sodium acetate Nutrition 0.000 description 1
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 description 1
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 description 1
- FQENQNTWSFEDLI-UHFFFAOYSA-J sodium diphosphate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])([O-])=O FQENQNTWSFEDLI-UHFFFAOYSA-J 0.000 description 1
- 229920005552 sodium lignosulfonate Polymers 0.000 description 1
- 235000010288 sodium nitrite Nutrition 0.000 description 1
- 229940048086 sodium pyrophosphate Drugs 0.000 description 1
- 239000000600 sorbitol Substances 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 235000019818 tetrasodium diphosphate Nutrition 0.000 description 1
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 description 1
- 238000009210 therapy by ultrasound Methods 0.000 description 1
- 239000000230 xanthan gum Substances 0.000 description 1
- 229920001285 xanthan gum Polymers 0.000 description 1
- 229940082509 xanthan gum Drugs 0.000 description 1
- 235000010493 xanthan gum Nutrition 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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/48—Clinker treatment
- C04B7/52—Grinding ; After-treatment of ground cement
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Disintegrating Or Milling (AREA)
Abstract
The invention provides a cement grinding aid, a preparation method and application thereof. The invention also provides a preparation method of the cement grinding aid. The cement grinding aid provided by the invention can improve the grinding aid effect, the fineness of cement, the fluidity and the water retention of cement, and the early and later strength of cement; meanwhile, the grinding aid provided by the invention has a simple formula, reduces the addition of alcohol amine substances, reduces the production cost of the grinding aid, improves the environmental protection property of the grinding aid, and can reduce the unit cost, save resources and reduce the carbon emission in the cement production process.
Description
Technical Field
The invention belongs to the field of building materials, and particularly relates to a cement grinding aid, and a preparation method and application thereof.
Background
The cement is an important cementing material and is widely applied to engineering such as civil construction, water conservancy, national defense and the like, and the conventional cement is usually compounded with a cement grinding aid for use. The cement grinding aid is added in the grinding process of cement clinker, so that the grindability of the material can be improved, the adhesion and agglomeration of fine particles and the adhesion on a lining plate and a grinding medium of a cement ball mill are prevented, and the fluidity of the material in the cement ball mill is improved, so that the product fineness and the yield of fine particle products are improved, the grinding limit and the unit energy consumption of the product are reduced, and the grinding efficiency is obviously improved or the energy consumption is reduced.
At present, the cement grinding aid can improve the annual production capacity, reduce the labor force, enlarge the production scale, reduce the power consumption of each ton of cement and reduce the production cost under the condition of not increasing grinding water and not changing the grinding time. The composite grinding aid also contains an excitant which plays a role in exciting the potential activity of cement mixed materials such as fly ash and mineral powder, and the like, so that the cement strength is improved. However, the existing cement grinding aid has the problems of poor grinding aid effect and cement reinforcing effect, low cost performance and low environmental protection property due to unreasonable formula or raw material selection and the like.
CN108947312A discloses an early strength type functional grinding aid, which comprises 60-80 parts of water, 0-20 parts of diethanol monoisopropanolamine (DEIPA), 0-20 parts of Sodium Tripolyphosphate (STPP), 0-20 parts of molasses and 0-5 parts of propylene glycol, wherein the early strength type functional grinding aid is compounded with cement in the using process, and the mass ratio of the early strength type functional grinding aid to the cement is 1: 1000. The cement grinding aid can only improve the early strength of cement, but does not pay attention to the later strength of the cement and the environmental protection property of the grinding aid.
CN102126843A discloses a cement grinding aid and a preparation method thereof, wherein the cement grinding aid comprises 8-20 wt% of triethanolamine, 0-10 wt% of triisopropanolamine, 8-20 wt% of glycol by-product, 0-10 wt% of synthetic glycerol, 0-25 wt% of molasses, 0-5 wt% of calcium lignosulfonate, 0-15 wt% of polyurethane, 0-10 wt% of cystine, 3-5 wt% of sorbitol, 5-10 wt% of sodium carboxymethylcellulose, 0-5 wt% of citric acid, 0-5 wt% of silicon powder, 0-5 wt% of fly ash and the balance of water. Although the cement grinding aid prepared by adopting the ultrasonic treatment process can improve the output of a cement grinding table, reduce energy consumption and obviously improve the performance of cement, the formula of the grinding aid is complex, and the problems of production cost and environmental protection of the grinding aid are not considered.
CN107382123A discloses a high-efficiency cement liquid grinding aid, which is prepared from the following raw materials in parts by weight: the papermaking black liquor comprises an alcamines compound, glycerol, sodium pyrophosphate, a water retention material, papermaking black liquor, saccharides, polytetrafluoroethylene, xanthan gum, sodium nitrite, industrial salt, calcium lignosulphonate, sodium acetate, glycol, calcium formate, maleic anhydride, sodium lignosulphonate and the balance of water; the preparation method comprises the following steps: dispensing, mixing and stirring, stirring and cooling and regulating the pH value. The grinding aid has a complex formula, and the problems of production cost and environmental protection of the grinding aid are not considered.
Therefore, how to reasonably design the formula of the grinding aid enables the prepared cement grinding aid to have excellent grinding aid effect, improve the fineness of cement, improve the fluidity and water retention of the cement and improve the early and later strength of the cement; meanwhile, the production cost of the grinding aid is reduced, and the environment friendliness of the grinding aid is improved.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a cement grinding aid and a preparation method and application thereof, and the cement grinding aid not only can improve the grinding aid effect, improve the fineness of cement, improve the fluidity and water retention of cement, but also can improve the early and later strength of cement by the synergistic action among sodium tripolyphosphate, polymeric polyol and calcium lignosulfonate; meanwhile, the grinding aid provided by the invention is simple in formula, the addition amount of alcamines is reduced, the production cost of the grinding aid is further reduced, and the grinding aid is more environment-friendly; and the unit cost in the cement production process can be reduced, the resources are saved, and the carbon emission is reduced.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a cement grinding aid comprising a polymeric polyol, sodium tripolyphosphate, and calcium ligno.
The sodium tripolyphosphate, the polymeric polyol and the calcium lignosulfonate in the cement grinding aid provided by the invention have a synergistic effect, wherein the polymeric polyol has extremely strong dispersibility and an electrostatic elimination effect, the hardness and the strength of materials can be greatly reduced, the sodium tripolyphosphate can improve the glue fusion and also can reduce the viscosity of ore pulp, and the dispersing capacity of the calcium lignosulfonate per se can disperse the polymeric polyol and the sodium tripolyphosphate while dispersing the ore pulp, so that the polymeric polyol and the sodium tripolyphosphate are more uniformly distributed in the ore pulp, and the grinding efficiency of the materials is further improved.
In addition, through the synergistic effect among the sodium tripolyphosphate, the polymeric polyol and the calcium lignosulfonate, the surface energy of cement materials can be reduced, the powder agglomeration phenomenon is obviously reduced, the fluidity of the cement powder is increased, the grading of grinding particles is improved, the powder is fully ground, the content of micro powder particles is increased, and meanwhile, the micro powder particles can participate in the later hydration reaction of cement. Therefore, the cement grinding aid provided by the invention can improve the fineness of cement, improve the fluidity and water retention of cement, and improve the early and later strength of cement. Meanwhile, the grinding aid provided by the invention is simple in formula, the addition amount of alcamines is reduced, the production cost of the grinding aid is further reduced, and the grinding aid is more environment-friendly; and the unit cost in the cement production process can be reduced, the resources are saved, and the carbon emission is reduced.
The cement grinding aid provided by the invention can be adsorbed on a new surface, so that the external stress required by crack propagation is reduced, and the crack propagation is promoted; according to the griffy law, the minimum stress required for brittle fracture is directly proportional to the specific surface energy of the material. Therefore, the cement grinding aid provided by the invention can reduce the surface energy of cement materials, improve the grinding efficiency and reduce the grinding energy consumption.
In a preferred embodiment of the invention, the cement grinding aid contains 10 to 15 parts by weight of the polymeric polyol, such as 10 parts, 11 parts, 12 parts, 12.5 parts, 13 parts, 13.5 parts, 14 parts or 15 parts, but the weight is not limited to the recited values, and other values not recited in the range of the values are also applicable; preferably 12 to 14 parts.
The invention particularly limits the content of the polymeric polyol to 10-15 parts, and when the content of the polymeric polyol is higher than 15 parts, the setting time of later-period cement is prolonged, because excessive residual polymeric polyol has a retarding effect; when the content of the polymeric polyol is less than 10 parts, the cement cannot be ground to a specific surface area that we need, because the grinding efficiency is low due to insufficient amount of the polymeric polyol.
In a preferred embodiment of the invention, the cement grinding aid contains 5 to 10 parts by weight of sodium tripolyphosphate, such as 5 parts, 6 parts, 6.5 parts, 7 parts, 7.5 parts, 8 parts, 9 parts or 10 parts, but not limited to the recited values, and other unrecited values within the range of the recited values are also applicable; preferably 6 to 8 parts.
The invention particularly limits the sodium tripolyphosphate to 5-10 parts, when the content of the sodium tripolyphosphate is higher than 10 parts, the setting time of the cement in the later period can be prolonged, because excessive residual sodium tripolyphosphate has a delayed coagulation effect; when the content of sodium tripolyphosphate is less than 5 parts, the cement cannot be ground to a specific surface area required by us, because the grinding efficiency is low due to insufficient amount of sodium tripolyphosphate.
In a preferred embodiment of the invention, the cement grinding aid contains ligno-calcium in an amount of 3 to 7 parts by weight, for example, 3 parts, 4 parts, 4.5 parts, 5 parts, 5.5 parts, 6 parts or 7 parts by weight, but the cement grinding aid is not limited to the above-mentioned values, and other values not listed in the above-mentioned range are also applicable; preferably 4 to 6 parts.
The invention particularly limits the content of the calcium lignocel to 3-7 parts, and when the content of the calcium lignocel is higher than 7 parts, the adaptability of the cement is deteriorated, because on one hand, the excessive calcium lignocel can lead the cement to be ground to be finer, and the cement can be hydrated too fast in the early stage, so that various adaptability problems are caused, such as fast collapse and damage; on the other hand, excessive calcium lignocellus can remain in the cement, so that a plurality of bubbles are generated in the process of using the cement in the later period; when the content of the wood calcium is less than 3 parts, the grinding effect is poor, and the grinding aid dispersing capacity is reduced due to insufficient use of the wood calcium.
As a preferable technical scheme, the cement grinding aid also comprises diethanol monoisopropanolamine.
Preferably, the amount of diethanolisopropanolamine is 15 to 25 parts by weight, for example, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts and 25 parts by weight, but is not limited to the recited values, and other values not recited in the range of the values are also applicable.
As a preferable technical scheme, the cement grinding aid also comprises triethanolamine.
Preferably, the triethanolamine is present in an amount of 15 to 20 parts by weight, for example 15, 16, 17, 18, 19 or 20 parts by weight, but not limited to the recited values, and other values not recited within this range are equally applicable.
As a preferable technical scheme, the cement grinding aid also comprises a defoaming agent.
Preferably, the defoaming agent in the cement grinding aid is 0.01-0.2 parts by weight, such as 0.01 parts, 0.03 parts, 0.05 parts, 0.08 parts, 0.1 parts, 0.13 parts, 0.15 parts, 0.18 parts or 0.2 parts, but not limited to the enumerated values, and other unrecited values in the numerical range are also applicable.
In a second aspect, the present invention provides a method for preparing the cement grinding aid of the first aspect, the method comprising:
and mixing and dissolving sodium tripolyphosphate, calcium lignosulphonate, polymeric polyol and optional diethanol monoisopropanolamine and/or triethanolamine in a solvent to obtain the cement grinding aid.
The preparation method of the cement grinding aid provided by the invention is simple in process, the raw materials are uniformly mixed at normal temperature and normal pressure to obtain the cement grinding aid, the cost is low, and the cement grinding aid is easy to popularize and apply.
As a preferred technical scheme of the present invention, the preparation method specifically comprises:
and adding the sodium tripolyphosphate and the calcium lignosulphonate into a solvent to be dissolved to obtain a primary mixed solution, then adding the diethanol monoisopropanolamine, the triethanolamine and the polymeric polyol into the primary mixed solution to be dissolved to obtain a secondary mixed solution, and finally adding a defoaming agent into the secondary mixed solution to be dissolved to obtain the cement grinding aid.
Preferably, the solvent comprises water.
Preferably, the dissolving process is carried out under stirring.
In a third aspect, the present invention provides a cement comprising the cement grinding aid of the first aspect.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the cement grinding aid and the preparation method thereof provided by the invention, through the synergistic effect among sodium tripolyphosphate, the polymeric polyol and the calcium lignosulphonate, the grinding aid effect can be improved, the grinding energy consumption is reduced, the fineness of the cement is improved, the fluidity and the water retention property of the cement are improved, and the early and later strength of the cement can be improved.
(2) The grinding aid provided by the invention is simple in formula, and simultaneously, the addition amount of alcamines is reduced, so that the production cost of the grinding aid is reduced, and the grinding aid is more environment-friendly; and the unit cost in the cement production process can be reduced, the resources are saved, and the carbon emission is reduced.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
The embodiment provides a cement grinding aid, which comprises the following components: 20 parts of diethanol monoisopropanolamine, 18 parts of triethanolamine, 13 parts of polymeric polyol (JY-20938), 7 parts of sodium tripolyphosphate, 5 parts of calcium lignosulfonate, 0.1 part of an antifoaming agent and 36.9 parts of water;
the preparation method of the cement grinding aid specifically comprises the following steps:
adding 7 parts of sodium tripolyphosphate and 5 parts of calcium lignosulphonate into 36.9 parts of water for dissolving to obtain a primary mixed solution, then adding 20 parts of diethanol monoisopropanolamine, 18 parts of triethanolamine and 13 parts of polymeric polyol into the primary mixed solution for dissolving to obtain a secondary mixed solution, and finally adding 0.1 part of defoaming agent into the secondary mixed solution for dissolving to obtain the cement grinding aid.
Example 2
The embodiment provides a cement grinding aid, which comprises the following components: 15 parts of diethanol monoisopropanolamine, 20 parts of triethanolamine, 10 parts of polymeric polyol (JY-20938), 10 parts of sodium tripolyphosphate, 3 parts of wood calcium, 0.01 part of an antifoaming agent and 41.99 parts of water;
the preparation method of the cement grinding aid specifically comprises the following steps:
adding 10 parts of sodium tripolyphosphate and 3 parts of calcium lignosulphonate into 41.99 parts of water for dissolving to obtain a primary mixed solution, adding 15 parts of diethanol monoisopropanolamine, 20 parts of triethanolamine and 10 parts of polymeric polyol into the primary mixed solution for dissolving to obtain a secondary mixed solution, and finally adding 0.01 part of defoaming agent into the secondary mixed solution for dissolving to obtain the cement grinding aid.
Example 3
The embodiment provides a cement grinding aid, which comprises the following components: 25 parts of diethanol monoisopropanolamine, 15 parts of triethanolamine, 15 parts of polymeric polyol (JY-20938), 5 parts of sodium tripolyphosphate, 7 parts of wood calcium, 0.2 part of an antifoaming agent and 32.8 parts of water;
the preparation method of the cement grinding aid specifically comprises the following steps:
and adding 5 parts of sodium tripolyphosphate and 7 parts of calcium lignosulphonate into 32.8 parts of water for dissolving to obtain a primary mixed solution, adding 25 parts of diethanol monoisopropanolamine, 15 parts of triethanolamine and 15 parts of polymeric polyol into the primary mixed solution for dissolving to obtain a secondary mixed solution, and finally adding 0.2 part of defoaming agent into the secondary mixed solution for dissolving to obtain the cement grinding aid.
Example 4
The embodiment provides a cement grinding aid, which comprises the following components: 20 parts of diethanol monoisopropanolamine, 18 parts of triethanolamine, 12 parts of polymeric polyol (JY-20938), 8 parts of sodium tripolyphosphate, 4 parts of calcium lignosulfonate, 0.1 part of an antifoaming agent and 37.9 parts of water;
the preparation method of the cement grinding aid specifically comprises the following steps:
adding 8 parts of sodium tripolyphosphate and 4 parts of calcium lignosulphonate into 37.9 parts of water for dissolving to obtain a primary mixed solution, then adding 20 parts of diethanol monoisopropanolamine, 18 parts of triethanolamine and 12 parts of polymeric polyol into the primary mixed solution for dissolving to obtain a secondary mixed solution, and finally adding 0.1 part of defoaming agent into the secondary mixed solution for dissolving to obtain the cement grinding aid.
Example 5
The embodiment provides a cement grinding aid, which comprises the following components: 20 parts of diethanol monoisopropanolamine, 18 parts of triethanolamine, 14 parts of polymeric polyol (JY-20938), 6 parts of sodium tripolyphosphate, 6 parts of calcium lignosulfonate, 0.1 part of an antifoaming agent and 35.9 parts of water;
the preparation method of the cement grinding aid specifically comprises the following steps:
adding 6 parts of sodium tripolyphosphate and 6 parts of calcium lignosulphonate into 35.9 parts of water for dissolving to obtain a primary mixed solution, then adding 20 parts of diethanol monoisopropanolamine, 18 parts of triethanolamine and 14 parts of polymeric polyol into the primary mixed solution for dissolving to obtain a secondary mixed solution, and finally adding 0.1 part of defoaming agent into the secondary mixed solution for dissolving to obtain the cement grinding aid.
Example 6
This example differs from example 1 in that the cement grinding aid composition contains 17 parts of polymeric polyol (JY-20938), and the rest of the process parameters and the operation steps are the same as example 1.
Example 7
This example differs from example 1 in that the cement grinding aid composition contains 8 parts of polymeric polyol (JY-20938), and the rest of the process parameters and the operation steps are the same as example 1.
Example 8
The difference between the cement grinding aid and the embodiment 1 is that the cement grinding aid comprises 12 parts of sodium tripolyphosphate, and the rest of the process parameters and the operation steps are the same as those in the embodiment 1.
Example 9
The difference between the cement grinding aid and the embodiment 1 is that the cement grinding aid comprises 3 parts of sodium tripolyphosphate, and the rest of the process parameters and the operation steps are the same as those in the embodiment 1.
Example 10
The difference between the cement grinding aid and the embodiment 1 is that the cement grinding aid comprises 8 parts of calcium lignosulphonate, and the rest of process parameters and operation steps are the same as those of the embodiment 1.
Example 11
The difference between the cement grinding aid and the embodiment 1 is that the cement grinding aid comprises 2 parts of calcium lignosulphonate, and the rest of process parameters and operation steps are the same as those of the embodiment 1.
Comparative example 1
The difference between the comparative example and the example 1 is that the composition of the cement grinding aid omits the polymerized polyol (JY-20938) and the sodium tripolyphosphate, and the total parts of the polymerized polyol and the sodium tripolyphosphate are distributed to the rest components according to the formula proportion of the cement grinding aid, and the rest process parameters and the operation steps are the same as those of the example 1.
Comparative example 2
The difference between the comparative example and the example 1 is that the composition of the cement grinding aid omits the polymeric polyol (JY-20938) and the ligneous calcium, the total parts of the polymeric polyol and the ligneous calcium are distributed to the other components according to the formula proportion of the cement grinding aid, and the other process parameters and the operation steps are the same as those of the example 1.
Comparative example 3
The difference between the comparative example and the example 1 is that sodium tripolyphosphate and calcium ligno-carbonate are omitted from the composition of the cement grinding aid, the total parts of the sodium tripolyphosphate and the calcium ligno-carbonate are distributed to the rest components according to the formula proportion of the cement grinding aid, and the rest process parameters and the operation steps are the same as those in the example 1.
Comparative example 4
The difference between the comparative example and the example 1 is that the composition of the cement grinding aid omits the polymeric polyol (JY-20938), the parts of the polymeric polyol are distributed to the rest components according to the formula proportion of the cement grinding aid, and the rest process parameters and the operation steps are the same as those of the example 1.
Comparative example 5
The difference between the comparative example and the example 1 is that sodium tripolyphosphate is omitted from the cement grinding aid, the parts of the sodium tripolyphosphate are distributed to the rest components according to the formula proportion of the cement grinding aid, and the rest process parameters and the operation steps are the same as those in the example 1.
Comparative example 6
The difference between the comparative example and the example 1 is that the cement grinding aid is prepared by omitting the ligneous calcium, and the ligneous calcium is distributed to other components according to the formula proportion of the cement grinding aid, and the other process parameters and the operation steps are the same as those of the example 1.
The results of performance tests of the cement grinding aids prepared in examples 1 to 11 and comparative examples 1 to 6 after being blended into cement (cement type PO 42.5; the amount of the cement grinding aid to be blended is 0.1 wt%) are shown in Table 1.
TABLE 1
As can be seen from the data in table 1:
(1) the cement grinding aids of examples 1-5 have high grinding aid effect, and the fluidity and water retention of cement are remarkably improved; meanwhile, the cement grinding aid provided by the invention also effectively improves the early and later strength of cement.
(2) The cement grinding aid of example 6 has a grinding aid effect and improves cement flowability to a lesser extent than that of example 1, but the strength of the cement at early and late stages is improved to a lesser extent than that of example 1, because the addition amount of the polymeric polyol in example 6 is too high, and excessive residual polymeric polyol has a retarding effect, so that the setting time of the cement at the later stage becomes longer, and the strength of the cement is poorer. The cement grinding aid of example 7 has a lower grinding aiding effect and improved flowability and strength than those of example 1, because the addition amount of the polymeric polyol is too low in example 7, and the use amount of the polymeric polyol is insufficient, so that the grinding efficiency is low, and the cement cannot be ground to the specific surface area required by us. Therefore, the addition amount of the polymeric polyol has a significant influence on the overall performance of the cement grinding aid of the invention.
(3) The cement grinding aid of the example 8 has the grinding aid effect and the improvement degree on the cement flowability which are not much different from those of the example 1, but the improvement degree on the early strength and the later strength of the cement is lower than that of the example 1, because the adding amount of the sodium tripolyphosphate is too high in the example 8, the excessive residual sodium tripolyphosphate has the retardation effect, the setting time of the cement in the later period is prolonged, and the strength of the cement is poor. The cement grinding aid of example 9 has lower grinding aid effect and improves the fluidity and strength of cement than that of example 1, because the addition amount of the polymeric polyol is too low in example 9, and the use amount of the sodium tripolyphosphate is insufficient, so that the grinding efficiency is low, and the cement cannot be ground to the specific surface area required by us. Therefore, the addition amount of the sodium tripolyphosphate also has obvious influence on the overall performance of the cement grinding aid.
(4) The cement grinding aid of the example 10 has the grinding aid effect and the improvement degree of the cement fluidity which are not much different from those of the example 1, but the improvement degree of the early and later strength of the cement is lower than that of the example 1, because the adding amount of the calcium lignocel in the example 10 is too high, and the excessive calcium lignocel can lead the cement to be more finely ground, lead the early hydration of the cement to cause various adaptability problems, such as rapid collapse and damage, and lead the excessive calcium lignocel to remain in the cement to cause a plurality of air bubbles when the cement is used in the later period. The cement grinding aid of example 11 has a lower grinding aid effect, and improves the fluidity and strength of cement than example 1, because the addition amount of the wood calcium is too low and the dosage of the wood calcium is insufficient, so that the dispersing ability of the grinding aid is reduced, and the grinding effect is poor. Therefore, the addition of ligno-calcium can also have a significant impact on the overall performance of the cement grinding aid of the present invention.
(5) The cement grinding aids of comparative examples 1-6 had less grinding aid effect, and improved levels of fluidity and strength of the cement than example 1, because the polymeric polyol and sodium tripolyphosphate were omitted from comparative example 1; comparative example 2 omits the polymeric polyol and the lignocel; comparative example 3 omits sodium tripolyphosphate and calcium ligno; comparative example 4 omits the polymeric polyol; comparative example 5 omits sodium tripolyphosphate; comparative example 6 omits the ligno-calcium. The data of comparative examples 1-3 show that the sodium tripolyphosphate, the polymeric polyol and the calcium ligno-chloride in the cement grinding aid provided by the invention have a synergistic effect, so that the grinding aid effect can be improved, the fineness of the cement can be improved, the fluidity and the water retention property of the cement can be improved, the early and later strength of the cement can be improved, and the overall performance of the cement grinding aid can be effectively enhanced.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The cement grinding aid is characterized by comprising polymeric polyol, sodium tripolyphosphate and calcium lignosulfonate.
2. The cement grinding aid as claimed in claim 1, wherein the weight part of the polymeric polyol in the cement grinding aid is 10-15 parts, preferably 12-14 parts.
3. The cement grinding aid as claimed in claim 1 or 2, wherein the weight part of the sodium tripolyphosphate in the cement grinding aid is 5-10 parts, preferably 6-8 parts.
4. The cement grinding aid as claimed in any one of claims 1 to 3, wherein the cement grinding aid contains ligno-calcium in an amount of 3 to 7 parts by weight, preferably 4 to 6 parts by weight.
5. The cement grinding aid of any one of claims 1 to 4, further comprising diethanol monoisopropanolamine;
preferably, the weight part of the diethanol monoisopropanolamine is 15-25 parts.
6. The cement grinding aid of any one of claims 1 to 5, further comprising triethanolamine;
preferably, the weight part of the triethanolamine is 15-20 parts.
7. The cement grinding aid of any one of claims 1-6, wherein the cement grinding aid further comprises an antifoaming agent;
preferably, the weight part of the defoaming agent is 0.01-0.2 part.
8. A method for preparing a cement grinding aid as claimed in any one of claims 1 to 7, wherein the method comprises:
and mixing and dissolving sodium tripolyphosphate, calcium lignosulphonate, polymeric polyol and optional diethanol monoisopropanolamine and/or triethanolamine in a solvent to obtain the cement grinding aid.
9. The method according to claim 8, wherein the method specifically comprises:
adding the sodium tripolyphosphate and the calcium lignosulphonate into a solvent to be dissolved to obtain a primary mixed solution, then adding the diethanol monoisopropanolamine, the triethanolamine and the polymeric polyol into the primary mixed solution to be dissolved to obtain a secondary mixed solution, and finally adding a defoaming agent into the secondary mixed solution to be dissolved to obtain the cement grinding aid;
preferably, the solvent comprises water;
preferably, the dissolving process is carried out under stirring.
10. A cement comprising the cement grinding aid of any one of claims 1-7.
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