CN117049813A - Gypsum water reducer and preparation method and application thereof - Google Patents
Gypsum water reducer and preparation method and application thereof Download PDFInfo
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- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 161
- 239000010440 gypsum Substances 0.000 title claims abstract description 161
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 119
- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 91
- 238000002360 preparation method Methods 0.000 title abstract description 18
- 239000004966 Carbon aerogel Substances 0.000 claims abstract description 54
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims abstract description 46
- 235000012424 soybean oil Nutrition 0.000 claims abstract description 37
- 239000003549 soybean oil Substances 0.000 claims abstract description 37
- 238000003756 stirring Methods 0.000 claims abstract description 37
- 238000002156 mixing Methods 0.000 claims abstract description 24
- -1 acrylic ester Chemical class 0.000 claims abstract description 22
- 239000002994 raw material Substances 0.000 claims abstract description 19
- 235000019832 sodium triphosphate Nutrition 0.000 claims description 25
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 20
- 235000011152 sodium sulphate Nutrition 0.000 claims description 20
- 239000002245 particle Substances 0.000 claims description 17
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims description 15
- 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 description 12
- 235000012207 sodium gluconate Nutrition 0.000 claims description 12
- 239000000176 sodium gluconate Substances 0.000 claims description 12
- 229940005574 sodium gluconate Drugs 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 8
- 239000004593 Epoxy Substances 0.000 claims description 4
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims description 4
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims description 4
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 4
- WYXIGTJNYDDFFH-UHFFFAOYSA-Q triazanium;borate Chemical compound [NH4+].[NH4+].[NH4+].[O-]B([O-])[O-] WYXIGTJNYDDFFH-UHFFFAOYSA-Q 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 2
- 230000000052 comparative effect Effects 0.000 description 21
- 238000001514 detection method Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 230000008859 change Effects 0.000 description 6
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 5
- 230000035699 permeability Effects 0.000 description 5
- 230000006872 improvement Effects 0.000 description 4
- 230000001603 reducing effect Effects 0.000 description 4
- 230000002411 adverse Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- DGVVJWXRCWCCOD-UHFFFAOYSA-N naphthalene;hydrate Chemical compound O.C1=CC=CC2=CC=CC=C21 DGVVJWXRCWCCOD-UHFFFAOYSA-N 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000007086 side reaction Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- WPJGWJITSIEFRP-UHFFFAOYSA-N 1,3,5-triazine-2,4,6-triamine;hydrate Chemical class O.NC1=NC(N)=NC(N)=N1 WPJGWJITSIEFRP-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920001732 Lignosulfonate Polymers 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910052925 anhydrite Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000008436 biogenesis Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000004128 high performance liquid chromatography Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- LNOPIUAQISRISI-UHFFFAOYSA-N n'-hydroxy-2-propan-2-ylsulfonylethanimidamide Chemical compound CC(C)S(=O)(=O)CC(N)=NO LNOPIUAQISRISI-UHFFFAOYSA-N 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- YWPOLRBWRRKLMW-UHFFFAOYSA-N sodium;naphthalene-2-sulfonic acid Chemical compound [Na+].C1=CC=CC2=CC(S(=O)(=O)O)=CC=C21 YWPOLRBWRRKLMW-UHFFFAOYSA-N 0.000 description 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 1
- 125000000542 sulfonic acid group Chemical group 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/302—Water reducers
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application relates to the technical field of water reducers. The application discloses a gypsum water reducer and a preparation method and application thereof. The gypsum water reducer comprises the following raw materials: beta-sodium naphthalene sulfonate formaldehyde condensate, anhydrous sodium sulfate, retarder, carbon aerogel, epoxidized soybean oil acrylic ester and water. The preparation method comprises the following steps: s1, mixing and stirring a beta-sodium naphthalene sulfonate formaldehyde condensate with water to prepare a solution A; s2, adding the epoxidized soybean oil acrylic ester into the solution A, and stirring to obtain a solution B; and S3, adding anhydrous sodium sulfate, retarder and carbon aerogel into the solution B, mixing and stirring, and adjusting the pH value to obtain the gypsum water reducer. The application also discloses application of the gypsum water reducer in gypsum under a damp-heat environment. The gypsum water reducer prepared by the application can effectively improve the wet heat resistance and mechanical property of gypsum.
Description
Technical Field
The application relates to the technical field of water reducers, in particular to a gypsum water reducer, a preparation method and application thereof.
Background
The Chinese is the large country of gypsum resources, the total reserve of various types of gypsum which are ascertained is about 570 hundred million tons, and the world is first. Therefore, the development of the gypsum material industry in China has the unique resource advantage. Gypsum exists in nature mainly in the form of natural anhydrite and anhydrite. By a certain production process, gypsum ores can be processed into gypsum cementing materials with different performances, and compared with other cementing materials, the gypsum cementing materials and products thereof have the advantages of low production energy consumption, light weight, heat preservation, thermal insulation, small expansion and contraction, good fire resistance, environmental protection and the like, but the gypsum cementing materials also have the weaknesses of high product porosity and lower strength, and greatly limit the application of the gypsum cementing materials. The application of water reducing agents is an important way to improve the performance of gypsum binders.
By adding the water reducer, the water consumption for mixing gypsum can be reduced under the condition of keeping the same fluidity, and the method is a practical and effective way for improving the strength of gypsum. In the gypsum field, a large number of water reducing agents are applied, including naphthalene water reducing agents, sulfamic acid water reducing agents, sulfonated melamine water reducing agents, polycarboxylic acid water reducing agents and lignin sulfonate water reducing agents, wherein naphthalene water reducing agents are high-efficiency water reducing agents with the largest domestic use amount at present, and main products include FDN, NF, UNF and the like. The molecular structure of the water-reducing agent contains benzene rings and sulfonic acid groups, has a strong dispersing effect, is high in water-reducing rate, is economical and colorless. However, the naphthalene water reducer has poor improvement of water resistance of gypsum, and cannot meet the application of gypsum materials in damp-heat environment.
Therefore, there is a need to develop a gypsum water reducer which can effectively improve the wet heat resistance of gypsum and has strong gypsum mechanical properties.
Disclosure of Invention
In order to solve at least one technical problem, a gypsum water reducer which can effectively improve the moist heat resistance of gypsum and has strong gypsum mechanical property is developed.
On one hand, the gypsum water reducer provided by the application comprises the following raw materials in parts by weight: 70-90 parts of beta-sodium naphthalene sulfonate formaldehyde condensate, 10-20 parts of anhydrous sodium sulphate, 0.5-10 parts of retarder, 2-10 parts of carbon aerogel, 3-15 parts of epoxidized soybean oil acrylic ester and 250-300 parts of water.
By adopting the technical scheme, the anhydrous sodium sulphate is added, so that the crystal growth and the crystal formation of the gypsum can be promoted, the strength and the hardness of a gypsum product are improved, the pores and the permeation paths in the gypsum are reduced, the permeation of moisture is prevented, and the moist heat resistance of the gypsum is improved.
According to the application, the carbon aerogel is added, has a porous structure and a larger specific surface area, and can adsorb and store moisture, so that free moisture in a gypsum mixture is reduced, the permeability and water resistance of gypsum are improved, and softening and damage of gypsum are prevented. Meanwhile, the porous structure of the carbon aerogel absorbs and stores moisture, and the evaporation speed of the moisture in the gypsum mixture can be slowed down, so that the risks of cracking and shrinkage of the gypsum are reduced, and the cracking resistance of the gypsum is improved.
According to the application, the epoxy soybean oil acrylic ester is added, so that the flexibility and the ductility of gypsum can be improved, and the gypsum is more resistant to folding and is not easy to crack. The epoxidized soybean oil acrylate has good lubricity and plasticization and can improve the fluidity and workability of gypsum mixtures. A film with waterproof property can be formed and coated on the surface of the gypsum particles to prevent the penetration and absorption of moisture, thereby improving the permeation resistance and the moist heat resistance of the gypsum. Meanwhile, the film can also reduce free moisture and pore moisture in the gypsum mixture, and further improve the water resistance.
The gypsum water reducer is prepared from specific raw materials and proportions, so that the permeability resistance and the water resistance of gypsum can be effectively improved, and the mechanical property of gypsum can be improved.
Optionally, the gypsum water reducer comprises the following raw materials in parts by weight: 75-85 parts of beta-sodium naphthalene sulfonate formaldehyde condensate, 13-17 parts of anhydrous sodium sulphate, 3-6 parts of retarder, 5-8 parts of carbon aerogel, 5-10 parts of epoxy soybean oil acrylic ester and 260-280 parts of water.
Optionally, the retarder is at least one selected from sodium gluconate, ammonium borate, sodium tripolyphosphate and sodium hexametaphosphate.
By adopting the technical scheme, the retarder is added, so that the setting reaction speed of gypsum can be delayed, and the gypsum has longer operable time, thereby better controlling the setting process of the gypsum. The fluidity and workability of the gypsum can also be improved, making the gypsum easier to construct and shape.
Optionally, the retarder is sodium gluconate and sodium tripolyphosphate, and the weight ratio of the sodium gluconate to the sodium tripolyphosphate is 1:1.
By adopting the technical scheme, the sodium gluconate and the sodium tripolyphosphate can mutually enhance the water reducing effect, improve the fluidity and the workability of the gypsum mixture, and can promote the crystallization and the interconnection between gypsum particles under the combined action of the sodium gluconate and the sodium tripolyphosphate so as to increase the strength and the stability of the gypsum mixture.
Optionally, the carbon aerogel is powder, the average grain diameter is 1-5 mu m, and the specific surface area is more than 1000 m 2 /g。
By adopting the technical scheme, the average particle size of the carbon aerogel is 1-5 mu m, and the specific surface area is more than 1000 m 2 And/g. If the average particle size of the carbon aerogel is too large, the carbon aerogel is not easy to uniformly disperse in gypsum, so that the water reducing effect is poor or uneven; too small an average particle size may increase the viscosity and tackiness of the gypsum water reducer, affecting the flowability and workability of the gypsum mixture. If the specific surface area of the carbon aerogel is too small, its interaction with water molecules may be weak and the water-reducing effect may not be obvious.
Optionally, the weight ratio of the carbon aerogel to the epoxidized soybean oil acrylate is 1: 1-3.
Through adopting above-mentioned technical scheme, carbon aerogel and epoxidized soybean oil acrylic ester can both improve the mobility of gypsum, and both interact forms stable disperse system, reduces the emergence of condensation and deposit, makes the water-reducing agent remain stable for a long time.
In a second aspect, the application provides a preparation method of the gypsum water reducing agent, which comprises the following steps:
s1, mixing the beta-sodium naphthalene sulfonate formaldehyde condensate with water, and stirring to obtain a solution A;
s2, adding the epoxidized soybean oil acrylic ester into the solution A, and stirring to obtain a solution B;
and S3, adding the anhydrous sodium sulphate, the retarder and the carbon aerogel into the solution B, mixing and stirring, and adjusting the pH value to obtain the gypsum water reducer.
By adopting the technical scheme, the raw materials are mixed gradually, so that the regulation and control of the product performance are facilitated, and side reactions and adverse effects can be avoided. The preparation method adopted by the application is simple and convenient to operate, and has no high-temperature energy consumption process, energy conservation, emission reduction and no pollution in the preparation process.
Optionally, in the step S2, the stirring temperature is 80-120 ℃, and the stirring time is 90-120 min.
By adopting the technical scheme, the application adopts specific stirring temperature and stirring time, and if the stirring temperature is too low or the stirring time is too short, the product is not uniform, and the performance of the product is affected; too high a stirring temperature may destroy the properties of the product and reduce the quality of the product.
Optionally, in the step S3, the pH is adjusted to 8.5 to 9.5.
By adopting the technical scheme, the pH value is adjusted to a specific range, if the pH value is too high, the water reducing effect of the water reducing agent can be reduced, and the stability of the water reducing agent can be damaged by the too high pH value, so that the performance of gypsum is affected; if the pH is too low, the water reducing effect of the gypsum water reducing agent may also be reduced.
In a third aspect, the application provides application of the gypsum water reducer in gypsum under a damp-heat environment.
Optionally, the mixing amount of the gypsum water reducer is 0.5% of the mass of gypsum.
By adopting the technical scheme, the gypsum water reducer prepared by the application can be applied to gypsum in a damp-heat environment.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the gypsum water reducer is prepared from specific raw materials and proportions, so that the permeability resistance and the moist heat resistance of gypsum can be effectively improved, and the mechanical property of gypsum can be improved.
2. According to the application, the anhydrous sodium sulphate is added, so that the strength of the gypsum product can be improved, the pores and the permeation paths in the gypsum can be reduced, the permeation of moisture is prevented, and the water resistance and the wet heat resistance of the gypsum are improved.
3. According to the application, the carbon aerogel is added, so that the permeability resistance and the water resistance of gypsum can be improved, and the softening and the damage of the gypsum are prevented. The epoxy soybean oil acrylic ester is added, so that a layer of film with waterproof property can be formed, and the film is coated on the surface of gypsum particles to prevent the penetration and absorption of moisture, thereby improving the permeation resistance and the water resistance of gypsum.
4. The application mixes the raw materials gradually, is beneficial to regulating and controlling the product performance, and can avoid side reactions and adverse effects. The preparation method adopted by the application is simple and convenient to operate, and has the advantages of energy conservation, emission reduction and no pollution in the preparation process.
Detailed Description
The present application will be described in further detail with reference to examples.
The application designs a gypsum water reducer, which comprises the following raw materials in parts by weight: 70-90 parts of beta-sodium naphthalene sulfonate formaldehyde condensate, 10-20 parts of anhydrous sodium sulphate, 0.5-10 parts of retarder, 2-10 parts of carbon aerogel, 3-15 parts of epoxidized soybean oil acrylic ester and 250-300 parts of water.
The gypsum water reducer is prepared by the following method, and comprises the following steps:
s1, mixing the beta-sodium naphthalene sulfonate formaldehyde condensate with water, and stirring to obtain a solution A;
s2, adding the epoxidized soybean oil acrylic ester into the solution A, and stirring to obtain a solution B;
and S3, adding the anhydrous sodium sulphate, the retarder and the carbon aerogel into the solution B, mixing and stirring, and adjusting the pH value to obtain the gypsum water reducer.
The gypsum water reducer is applied to gypsum in a damp-heat environment.
The inventor designs the technical scheme of the application aiming at the problem that the existing gypsum water reducer can not meet the gypsum application under the damp-heat environment.
Firstly, the gypsum water reducing agent provided by the application comprises the following components: the beta-naphthalene sodium sulfonate formaldehyde condensate, anhydrous sodium sulfate, retarder, carbon aerogel, epoxidized soybean oil acrylic ester and water can effectively improve the permeability resistance and wet heat resistance of gypsum and improve the mechanical properties of gypsum.
Secondly, the preparation method of the gypsum water reducer adopted by the application gradually mixes the raw materials, is beneficial to regulating and controlling the product performance, and can avoid side reactions and adverse effects. And the operation is simple and convenient, the energy is saved, the emission is reduced in the preparation process, and no pollution is caused.
The raw materials adopted by the application are all from commercial products, and the specific manufacturers are as follows:
sodium beta-naphthalenesulfonate formaldehyde condensate: anhui biogenesis chemical Co., ltd., product number: SY-5.
Anhydrous sodium sulphate: western Anxin san Jose Limited liability company, purity: 99%.
Sodium gluconate: purity of Jinan remote chemical industry Co., ltd.): 99%.
Ammonium borate: chongqing Yuan Xiang science and technology development Co., ltd., purity: 99% HPLC.
Sodium tripolyphosphate: wuhan Xin Yangli and chemical technology Co., ltd., purity: 98%.
Sodium hexametaphosphate: wuhan Mecanxin technologies Co., ltd., purity: 98.5%.
Epoxidized soybean oil acrylate: hubei is emerging for changing new material science and technology limited company, purity: 99%.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Examples 1 to 5
Example 1
The embodiment provides a gypsum water reducer, which comprises the following raw materials in parts by weight: 90 parts of beta-sodium naphthalene sulfonate formaldehyde condensate, 10 parts of anhydrous sodium sulfate, 10 parts of sodium tripolyphosphate, 2 parts of carbon aerogel, 15 parts of epoxidized soybean oil acrylate and 250 parts of water.
Wherein the average particle diameter of the carbon aerogel is 3 mu m, and the specific surface area is 1500 m 2 /g。
The preparation method comprises the following steps:
s1, mixing the beta-sodium naphthalene sulfonate formaldehyde condensate with water, and stirring to obtain a solution A;
s2, adding the epoxidized soybean oil acrylic ester into the solution A, and stirring for 120min at 80 ℃ to obtain a solution B;
and S3, adding the anhydrous sodium sulphate, the sodium tripolyphosphate and the carbon aerogel into the solution B, mixing and stirring, and adjusting the pH value to 9 to obtain the gypsum water reducer.
The prepared gypsum water reducer is applied to gypsum in a damp-heat environment.
Example 2
The embodiment provides a gypsum water reducer, which comprises the following raw materials in parts by weight: 75 parts of beta-sodium naphthalene sulfonate formaldehyde condensate, 15 parts of anhydrous sodium sulfate, 3 parts of sodium tripolyphosphate, 8 parts of carbon aerogel, 8 parts of epoxidized soybean oil acrylic ester and 260 parts of water.
Wherein the average particle diameter of the carbon aerogel is 3 mu m, and the specific surface area is 1500 m 2 /g。
The preparation method comprises the following steps:
s1, mixing the beta-sodium naphthalene sulfonate formaldehyde condensate with water, and stirring to obtain a solution A;
s2, adding the epoxidized soybean oil acrylic ester into the solution A, and stirring for 100min at 110 ℃ to obtain a solution B;
and S3, adding the anhydrous sodium sulphate, the sodium tripolyphosphate and the carbon aerogel into the solution B, mixing and stirring, and adjusting the pH value to 9 to obtain the gypsum water reducer.
The prepared gypsum water reducer is applied to gypsum in a damp-heat environment.
Example 3
The embodiment provides a gypsum water reducer, which comprises the following raw materials in parts by weight: 80 parts of beta-sodium naphthalene sulfonate formaldehyde condensate, 13 parts of anhydrous sodium sulphate, 6 parts of sodium tripolyphosphate, 6 parts of carbon aerogel, 5 parts of epoxidized soybean oil acrylic ester and 270 parts of water.
Wherein the average particle diameter of the carbon aerogel is 3 mu m, and the ratio tableArea is 1500 m 2 /g。
The preparation method comprises the following steps:
s1, mixing the beta-sodium naphthalene sulfonate formaldehyde condensate with water, and stirring to obtain a solution A;
s2, adding the epoxidized soybean oil acrylic ester into the solution A, and stirring for 105min at 90 ℃ to obtain a solution B;
and S3, adding the anhydrous sodium sulphate, the sodium tripolyphosphate and the carbon aerogel into the solution B, mixing and stirring, and adjusting the pH value to 9 to obtain the gypsum water reducer.
The prepared gypsum water reducer is applied to gypsum in a damp-heat environment.
Example 4
The embodiment provides a gypsum water reducer, which comprises the following raw materials in parts by weight: 85 parts of beta-sodium naphthalene sulfonate formaldehyde condensate, 17 parts of anhydrous sodium sulphate, 5 parts of sodium tripolyphosphate, 5 parts of carbon aerogel, 10 parts of epoxidized soybean oil acrylate and 280 parts of water.
Wherein the average particle diameter of the carbon aerogel is 3 mu m, and the specific surface area is 1500 m 2 /g。
The preparation method comprises the following steps:
s1, mixing the beta-sodium naphthalene sulfonate formaldehyde condensate with water, and stirring to obtain a solution A;
s2, adding the epoxidized soybean oil acrylic ester into the solution A, and stirring for 110min at 100 ℃ to obtain a solution B;
and S3, adding the anhydrous sodium sulphate, the sodium tripolyphosphate and the carbon aerogel into the solution B, mixing and stirring, and adjusting the pH value to 9 to obtain the gypsum water reducer.
The prepared gypsum water reducer is applied to gypsum in a damp-heat environment.
Example 5
The embodiment provides a gypsum water reducer, which comprises the following raw materials in parts by weight: 70 parts of beta-sodium naphthalene sulfonate formaldehyde condensate, 20 parts of anhydrous sodium sulfate, 0.5 part of sodium tripolyphosphate, 10 parts of carbon aerogel, 3 parts of epoxidized soybean oil acrylic ester and 300 parts of water.
Wherein the carbon aerogelAn average particle diameter of 3 μm and a specific surface area of 1500 m 2 /g。
The preparation method comprises the following steps:
s1, mixing the beta-sodium naphthalene sulfonate formaldehyde condensate with water, and stirring to obtain a solution A;
s2, adding the epoxidized soybean oil acrylic ester into the solution A, and stirring for 90min at 120 ℃ to obtain a solution B;
and S3, adding the anhydrous sodium sulphate, the sodium tripolyphosphate and the carbon aerogel into the solution B, mixing and stirring, and adjusting the pH value to 9 to obtain the gypsum water reducer.
The prepared gypsum water reducer is applied to gypsum in a damp-heat environment.
Comparative examples 1 to 5
Comparative example 1
Comparative example 1 differs from example 2 in that comparative example 1 replaces 8 parts of carbon aerogel with equal weight of epoxidized soybean oil acrylate.
Comparative example 2
Comparative example 2 differs from example 2 in that comparative example 2 replaces 8 parts of epoxidized soybean oil acrylate with an equivalent weight of carbon aerogel.
Comparative example 3
Comparative example 3 differs from example 2 in that comparative example 3 did not incorporate carbon aerogel and epoxidized soybean oil acrylate.
Comparative example 4
Comparative example 4 differs from example 2 in that no anhydrous sodium sulphate was added to comparative example 4.
Comparative example 5
Comparative example 5 differs from example 2 in that the preparation method in comparative example 5 is: and (3) directly mixing and stirring all the raw materials to prepare the gypsum water reducer.
Experimental detection
Detection item and detection method
The application method of the gypsum water reducer prepared by the application comprises the following steps: and (3) mixing the gypsum water reducer with the mixing amount of 0.5% of the mass of gypsum to prepare the gypsum board.
And (3) wet heat resistance detection: a230 mm by 230mm test piece was cut longitudinally on the plasterboard at a distance of greater than 100mm from the periphery. The sample is dried to constant weight (the mass change rate is less than 5g in 24 h) in an electrothermal blowing drying oven at 40 ℃, then is placed for 72h under the conditions of 25 ℃ and relative humidity of 50%, and the surface change of the test piece is observed;
the test piece surface change grade was rated as follows:
five stages: no obvious change exists;
four stages: a slight change in gloss and/or color at a certain angle;
three stages: moderate changes in gloss and/or color;
and (2) second-stage: a significant change in gloss and/or color;
first-order: surface cracking and/or bubbling.
The detection of the compressive strength of gypsum boards is carried out according to GB/T17669.3-1999 "determination of mechanical Properties of construction gypsum".
The gypsum boards prepared by using the gypsum water reducing agents in examples 1 to 5 and comparative examples 1 to 5 were subjected to the detection of wet heat resistance and compressive strength, and the detection results are shown in table 1.
TABLE 1
From the test results shown in Table 1, it is clear that the gypsum board prepared by using the gypsum water reducing agent in examples 1 to 5 has significantly higher wet heat resistance and compressive strength than those of comparative examples 1 to 5, and the gypsum water reducing agent prepared in examples 1 to 5 has good wet heat resistance, good permeation resistance and high compressive strength.
The gypsum water reducer prepared in comparative examples 1-3 is used in gypsum, has similar wet heat resistance and compressive strength, but is obviously lower than that in examples 1-5.
Comparative example 4 the gypsum water reducer prepared without the addition of anhydrous sodium sulphate was used in gypsum and the wet heat resistance and compressive strength were significantly lower than those of example 2.
Comparative example 5 all the raw materials were directly mixed and stirred without stepwise mixing, and the prepared gypsum water reducing agent was used in gypsum, and the wet heat resistance and compressive strength were significantly reduced as compared with example 2. The inventors speculate that the main reason is that the reaction is not uniform, which affects the product performance.
Examples 6 to 17
Example 6
Example 6 differs from example 2 in that example 6 replaces 3 parts sodium tripolyphosphate with 3 parts sodium gluconate.
Example 7
Example 7 differs from example 2 in that example 7 replaces 3 parts of sodium tripolyphosphate with 1 part of sodium gluconate and 2 parts of sodium tripolyphosphate.
Example 8
Example 8 differs from example 2 in that example 8 replaces 3 parts sodium tripolyphosphate with 1.5 parts sodium gluconate and 1.5 parts sodium tripolyphosphate.
Example 9
Example 9 differs from example 2 in that example 9 replaces 3 parts of sodium tripolyphosphate with 1.5 parts of ammonium borate and 1.5 parts of sodium hexametaphosphate.
Example 10
Example 10 differs from example 2 in that the average particle size of the carbon aerogel in example 10 was 0.5 μm.
Example 11
Example 11 differs from example 2 in that the average particle diameter of the carbon aerogel in example 11 was 8 μm.
Example 12
Example 12 differs from example 2 in that the specific surface area of the carbon aerogel in example 12 is 800 m 2 /g。
Example 13
Example 13 differs from example 2 in that the weight ratio of carbon aerogel to epoxidized soybean oil acrylate in example 13 is 1:3, and the total weight of carbon aerogel to epoxidized soybean oil acrylate is 16 parts.
Example 14
Example 14 differs from example 2 in that the weight ratio of carbon aerogel to epoxidized soybean oil acrylate in example 14 is 1:0.5, and the total weight of carbon aerogel to epoxidized soybean oil acrylate is 16 parts.
Example 15
Example 15 differs from example 2 in that the weight ratio of carbon aerogel to epoxidized soybean oil acrylate in example 15 is 1:5, and the total weight of carbon aerogel to epoxidized soybean oil acrylate is 16 parts.
Example 16
Example 16 differs from example 2 in that in step S3 of example 16, the pH is adjusted to 8.
Example 17
Example 17 differs from example 2 in that in step S3 of example 17, the pH is adjusted to 10.
The gypsum boards prepared by using the gypsum water reducing agents in examples 6 to 17 were subjected to the detection of wet heat resistance and compressive strength, and the detection results are shown in Table 2.
TABLE 2
From the test results in table 2, it is clear that the gypsum water reducer prepared in example 8 of examples 6 to 9 has the best performance improvement on gypsum and the highest compressive strength.
In examples 10-11, the average particle size of the carbon aerogel is different, and the performance of the prepared gypsum water reducer on gypsum is not improved as compared with that of example 2, if the average particle size of the carbon aerogel is too small, the viscosity and viscosity of the gypsum water reducer can be increased, and the processability is affected; if the average particle size of the carbon aerogel is too large, its dispersibility and stability in the gypsum water reducing agent may be affected, thereby affecting the overall performance of the gypsum water reducing agent.
In example 12, the specific surface area of the carbon aerogel was different, and the wet heat resistance and compressive strength of the prepared gypsum water reducer were inferior to those of example 2, and the inventors speculated that the specific surface area of the carbon aerogel was too small, the surface active sites thereon were reduced, and the interaction with other components was weakened, thus affecting the performance improvement effect of the gypsum water reducer on gypsum.
The gypsum water reducer prepared in examples 13 to 15 was used in gypsum, and the wet heat resistance and the compressive strength were both reduced as compared with example 2.
In examples 16 to 17, the pH value of the gypsum water reducing agent is different, the improvement of the moisture and heat resistance and the compressive strength of gypsum is obviously reduced compared with that of example 2, and the inventor speculates that the stability of the water reducing agent is affected by the too large or too small pH value.
The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.
Claims (10)
1. The gypsum water reducer is characterized by comprising the following raw materials in parts by weight: 70-90 parts of beta-sodium naphthalene sulfonate formaldehyde condensate, 10-20 parts of anhydrous sodium sulphate, 0.5-10 parts of retarder, 2-10 parts of carbon aerogel, 3-15 parts of epoxidized soybean oil acrylic ester and 250-300 parts of water.
2. The gypsum water reducer according to claim 1, wherein the raw materials comprise, in parts by weight: 75-85 parts of beta-sodium naphthalene sulfonate formaldehyde condensate, 13-17 parts of anhydrous sodium sulphate, 3-6 parts of retarder, 5-8 parts of carbon aerogel, 5-10 parts of epoxy soybean oil acrylic ester and 260-280 parts of water.
3. The gypsum water reducer according to claim 1, wherein the retarder is at least one selected from the group consisting of sodium gluconate, ammonium borate, sodium tripolyphosphate, sodium hexametaphosphate.
4. The gypsum water reducer of claim 1, wherein the retarder is sodium gluconate and sodium tripolyphosphate, and the weight ratio of the sodium gluconate to the sodium tripolyphosphate is 1:1.
5. The gypsum water reducer according to claim 1, wherein the carbon aerogel is a powder, the average particle diameter is 1-5 μm, and the specific surface area is more than 1000 m 2 /g。
6. The gypsum water reducer of claim 1, wherein the weight ratio of the carbon aerogel to the epoxidized soybean oil acrylate is 1: 1-3.
7. A method for preparing the gypsum water reducing agent as set forth in claim 1, comprising the steps of:
s1, mixing the beta-sodium naphthalene sulfonate formaldehyde condensate with water, and stirring to obtain a solution A;
s2, adding the epoxidized soybean oil acrylic ester into the solution A, and stirring to obtain a solution B;
and S3, adding the anhydrous sodium sulphate, the retarder and the carbon aerogel into the solution B, mixing and stirring, and adjusting the pH value to obtain the gypsum water reducer.
8. The method for preparing the gypsum water reducer according to claim 7, wherein in the step S2, the stirring temperature is 80-120 ℃, and the stirring time is 90-120 min.
9. The method for preparing the gypsum water reducer according to claim 7, wherein in the step S3, the pH is adjusted to 8.5 to 9.5.
10. A gypsum water reducer according to any one of claims 1 to 6 applied to gypsum in a hot and humid environment.
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