CN115159966B - High-strength refractory castable and preparation method thereof - Google Patents
High-strength refractory castable and preparation method thereof Download PDFInfo
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- CN115159966B CN115159966B CN202210758855.5A CN202210758855A CN115159966B CN 115159966 B CN115159966 B CN 115159966B CN 202210758855 A CN202210758855 A CN 202210758855A CN 115159966 B CN115159966 B CN 115159966B
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- 238000002360 preparation method Methods 0.000 title abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 66
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 46
- 239000000843 powder Substances 0.000 claims abstract description 40
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 31
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 31
- 239000011230 binding agent Substances 0.000 claims abstract description 17
- 229920002635 polyurethane Polymers 0.000 claims abstract description 17
- 239000004814 polyurethane Substances 0.000 claims abstract description 17
- 239000000835 fiber Substances 0.000 claims description 34
- 239000002202 Polyethylene glycol Substances 0.000 claims description 26
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 claims description 26
- 229920001223 polyethylene glycol Polymers 0.000 claims description 26
- 229910052593 corundum Inorganic materials 0.000 claims description 22
- 239000010431 corundum Substances 0.000 claims description 22
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 16
- 238000002156 mixing Methods 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 14
- 229920001730 Moisture cure polyurethane Polymers 0.000 claims description 11
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 11
- JVYDLYGCSIHCMR-UHFFFAOYSA-N 2,2-bis(hydroxymethyl)butanoic acid Chemical compound CCC(CO)(CO)C(O)=O JVYDLYGCSIHCMR-UHFFFAOYSA-N 0.000 claims description 9
- 150000004645 aluminates Chemical group 0.000 claims description 9
- 239000004568 cement Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 239000000178 monomer Substances 0.000 claims description 8
- 229910001220 stainless steel Inorganic materials 0.000 claims description 8
- 239000010935 stainless steel Substances 0.000 claims description 8
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 239000000377 silicon dioxide Substances 0.000 claims description 7
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 claims description 6
- 239000012948 isocyanate Substances 0.000 claims description 5
- 150000002513 isocyanates Chemical class 0.000 claims description 5
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 4
- 239000012784 inorganic fiber Substances 0.000 claims description 4
- 239000005058 Isophorone diisocyanate Substances 0.000 claims description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 3
- NIMLQBUJDJZYEJ-UHFFFAOYSA-N isophorone diisocyanate Chemical compound CC1(C)CC(N=C=O)CC(C)(CN=C=O)C1 NIMLQBUJDJZYEJ-UHFFFAOYSA-N 0.000 claims description 3
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 claims description 2
- 239000005057 Hexamethylene diisocyanate Substances 0.000 claims description 2
- 239000004743 Polypropylene Substances 0.000 claims description 2
- 239000010425 asbestos Substances 0.000 claims description 2
- 238000004132 cross linking Methods 0.000 claims description 2
- 239000003365 glass fiber Substances 0.000 claims description 2
- RRAMGCGOFNQTLD-UHFFFAOYSA-N hexamethylene diisocyanate Chemical compound O=C=NCCCCCCN=C=O RRAMGCGOFNQTLD-UHFFFAOYSA-N 0.000 claims description 2
- -1 polypropylene Polymers 0.000 claims description 2
- 229920001155 polypropylene Polymers 0.000 claims description 2
- 239000010453 quartz Substances 0.000 claims description 2
- 229910052895 riebeckite Inorganic materials 0.000 claims description 2
- 239000012615 aggregate Substances 0.000 claims 1
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 claims 1
- 238000012423 maintenance Methods 0.000 claims 1
- 239000007767 bonding agent Substances 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 description 22
- 239000002994 raw material Substances 0.000 description 13
- 239000007864 aqueous solution Substances 0.000 description 9
- 238000003756 stirring Methods 0.000 description 9
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 8
- 238000007580 dry-mixing Methods 0.000 description 7
- 238000004321 preservation Methods 0.000 description 6
- 239000011819 refractory material Substances 0.000 description 6
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 description 5
- 239000012975 dibutyltin dilaurate Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 238000005266 casting Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000005189 flocculation Methods 0.000 description 2
- 230000016615 flocculation Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- INJAHHABQHQOMY-UHFFFAOYSA-N 2-(dihydroxymethyl)butanoic acid Chemical compound CCC(C(O)O)C(O)=O INJAHHABQHQOMY-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- 230000010100 anticoagulation Effects 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 125000002843 carboxylic acid group Chemical group 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000011344 liquid material Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 235000019832 sodium triphosphate Nutrition 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
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- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
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- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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Abstract
The invention discloses a high-strength refractory castable and a preparation method thereof, wherein the refractory castable comprises 50-70 parts of refractory aggregate, 20-40 parts of powder and 1-10 parts of bonding agent in parts by weight; wherein the refractory castable further comprises a water reducer, and the addition amount of the water reducer is 0.1-0.5wt% of the sum of the weight of the refractory aggregate, the weight of the powder and the weight of the binding agent. According to the high-strength refractory castable and the preparation method thereof, the polyvinyl alcohol modified polyurethane is introduced as the water reducer, so that the refractory castable with good fluidity and high strength is obtained.
Description
Technical Field
The invention belongs to the technical field of refractory materials, and particularly relates to a high-strength refractory castable and a preparation method thereof.
Background
The refractory material plays an indispensable role in national construction and national development due to the characteristics of ultrahigh refractoriness, higher than 1580 ℃ and stable physical and chemical properties in the sintering process. As the application field of refractory materials is becoming more and more widespread, most of them are applied in the high temperature field because of their good physicochemical properties. Many types of refractory materials exist, which can be broadly divided into shaped and unshaped. The refractory castable is used as a novel refractory material, and can be directly used without high-temperature heat treatment to be widely applied. Meanwhile, the refractory castable also has various performance advantages: the service life is longer, the construction is more mechanized, the construction efficiency is very high, the tightness of the constructed kiln is high, and the gas in the kiln is more sufficient, so that the composite material is widely applied to lining materials of thermal kilns with complex configurations. Up to now, new types of refractory castable are continuously updated, materials and production processes are continuously improved, and therefore the refractory castable is used more and more effectively, and the application field is wider and wider.
At present, the refractory castable consists of refractory aggregate, refractory powder, a binding agent, an additive, water or other liquid materials, has higher fluidity, can be molded by casting, vibration, tamping and other methods, and can also be directly manufactured into prefabricated parts, and hardening can be realized without heating. After the refractory castable is stirred by adding water, a water molecule layer is formed on the surfaces of the castable particles due to hydration, and in addition, the opposite charges on the surfaces of the particles enable association between the particles to be generated, so that a flocculation structure is formed in the castable. Thus, a portion of the mixing water is entrapped in the particles and cannot participate in free flow and lubrication, thereby affecting the flowability of the casting.
The water reducer is an anionic surfactant, and is added into refractory castable, and the water reducer is adsorbed on the surface of castable particles, so that the castable particles are mutually dispersed, the fluidity of the castable is improved, the unit water consumption is reduced, and the construction is facilitated. In addition, the water reducer structure has hydrophilic branched chains, and the hydrophilic branched chains extend into the aqueous solution to form a hydrophilic three-dimensional adsorption layer with a certain thickness on the surface of the adsorbed castable particles. When the castable particles are close, the adsorption layers start to overlap, a steric hindrance effect is generated among the particles, the more the overlap is, the larger the steric hindrance repulsive force is, the larger the obstruction to the agglomeration among the castable particles is, and the slump of the castable is kept good.
The existing water reducing agents commonly used include polycarboxylic acids, phosphates, polyacrylates and the like, but the water reducing agents are sensitive to raw materials of refractory castable and are easy to inactivate, so that the dispersing effect of the refractory castable is affected. How to improve the activity of the water reducing agent so as to improve the dispersion and anticoagulation effects of the refractory castable and further improve the strength and other performances of the obtained refractory castable is a significant research topic in the field of refractory materials at present.
Disclosure of Invention
Based on the technical problems, the invention provides a high-strength refractory castable and a preparation method thereof, and the polyvinyl alcohol modified polyurethane is introduced as a water reducing agent to finally obtain the refractory castable with good fluidity and high strength.
The invention provides a high-strength refractory castable which comprises, by weight, 50-70 parts of refractory aggregate, 20-40 parts of powder and 1-10 parts of a binding agent;
wherein the refractory castable further comprises a water reducer, and the addition amount of the water reducer is 0.1-0.5wt% of the sum of the weight of the refractory aggregate, the weight of the powder and the weight of the binding agent.
Preferably, the water reducer is polyvinyl alcohol modified polyurethane, and is specifically obtained by polycondensing hydroxyl monomers including dimethylol butyric acid and polyethylene glycol ether and isocyanate monomers to obtain polyurethane prepolymer, and then carrying out crosslinking reaction with polyvinyl alcohol.
Preferably, the isocyanate monomer is at least one of toluene diisocyanate, diphenylmethane diisocyanate, isophorone diisocyanate or hexamethylene diisocyanate;
preferably, the addition amount of the dimethylol butyric acid is 5-15wt% of the polyethylene glycol ether;
preferably, the polyvinyl alcohol is added in an amount of 20 to 40wt% of the polyethylene glycol ether.
Preferably, the refractory aggregate is at least one of corundum, bauxite or quartz;
preferably, the refractory aggregate has a particle size of 0.088-10mm.
Preferably, the powder is at least one of corundum powder, alumina powder, silica micropowder, chromium oxide powder or zirconium oxide powder.
Preferably, the binder is aluminate cement;
preferably, the alumina content of the aluminate cement is 50-80wt%.
Preferably, the refractory castable further comprises fibers, and the addition amount of the fibers is 0.1-2wt% of the sum of the weight of the refractory aggregate, the powder and the binder.
Preferably, the fibers are organic and/or inorganic fibers;
preferably, the organic fiber is at least one of polypropylene explosion-proof fiber, carbon fiber or graphite fiber, and the inorganic fiber is at least one of stainless steel fiber, aluminum silicate fiber, glass fiber or asbestos fiber.
The invention also provides a preparation method of the high-strength refractory castable, which comprises the following steps: and dry-mixing the refractory aggregate, the powder and the bonding agent in a mixer according to the formula amount, adding the water reducer and water for wet mixing, pouring the obtained mixture into a mold, vibrating, demolding and curing to obtain the high-strength refractory castable.
Compared with the prior art, the invention provides the high-strength refractory castable, the polyvinyl alcohol modified polyurethane is selected as the water reducer, the hydroxy monomer of the dihydroxymethyl butyric acid and the polyethylene glycol ether and the isocyanate monomer are condensed in the water reducer to form the long-chain polyurethane, and the long-chain polyurethane has the carboxylic acid group which can be subsequently crosslinked with the polyvinyl alcohol, so that the obtained polyvinyl alcohol modified polyurethane has rich polar groups, can be effectively adsorbed on the surface of the castable particles, thereby greatly enhancing the dispersion performance of the castable particles in water, and has stable structure and reduced flocculation tendency of the water reducer, so that the obtained refractory castable has good flow performance, and the mechanical property and the refractory performance of the obtained refractory castable are more excellent under the high-temperature condition.
Detailed Description
The present invention will be described in detail by way of specific examples, which should be clearly set forth for the purpose of illustration and are not to be construed as limiting the scope of the present invention.
Example 1
The high-strength refractory castable comprises the following components in parts by weight: 45 parts of 1-6mm plate-shaped corundum, 15 parts of 0.088-1mm electro-fused white corundum, 15 parts of < 0.088mm electro-fused white corundum powder, 12 parts of alumina powder, 3 parts of silica micropowder, 4 parts of aluminate cement, 1 part of stainless steel fiber, 1 part of aluminum silicate fiber, 0.2 part of water reducer and 3 parts of water;
the water reducer is polyvinyl alcohol modified polyurethane, and is prepared by the following method: adding polyethylene glycol ether (molecular weight 350) and toluene diisocyanate into a reaction kettle according to the ratio of NCO/OH=1.5, uniformly mixing, adding dimethylolbutyric acid (8 wt% of the mass of the polyethylene glycol ether), heating to 60 ℃, adding dibutyltin dilaurate (the addition amount is 2wt% of the mass of the polyethylene glycol ether), heating to 85 ℃, and stirring for reacting for 3 hours to obtain polyurethane prepolymer; and (3) cooling to 40 ℃, adding acetone to dilute the obtained polyurethane prepolymer, adding a polyvinyl alcohol aqueous solution (PVA 1799, wherein the added amount of the polyvinyl alcohol is 30wt% of the mass of the polyethylene glycol ether, and the content of the aqueous solution is 15 wt%) and heating to 90 ℃, and then continuously stirring and reacting for 2 hours to obtain the polyvinyl alcohol modified polyurethane, namely the water reducer.
The preparation method of the high-strength refractory castable specifically comprises the following steps: according to the proportion, the raw materials are weighed, the raw materials corresponding to the refractory aggregate, the powder, the binding agent and the fiber are firstly added into a stirrer for dry mixing, then the water reducing agent and the water are added for wet mixing, the obtained mixture is poured into a 40mm multiplied by 160mm mould and uniformly vibrated, naturally cured for 24 hours at room temperature, then demoulded, dried for 24 hours at 110 ℃, and subjected to heat preservation and heat treatment for 3 hours at 1100 ℃ under the air condition, thus obtaining the sample to be tested.
Example 2
The high-strength refractory castable comprises the following components in parts by weight: 40 parts of 1-6mm plate-shaped corundum, 10 parts of 0.088-1mm electro-fused white corundum, 20 parts of < 0.088mm electro-fused white corundum powder, 10 parts of alumina powder, 4 parts of silicon micropowder, 6 parts of zirconia powder, 4 parts of aluminate cement, 1 part of stainless steel fiber, 0.2 part of water reducer and 3 parts of water;
the water reducer is polyvinyl alcohol modified polyurethane, and is prepared by the following method: adding polyethylene glycol ether (molecular weight 350) and toluene diisocyanate into a reaction kettle according to the ratio of NCO/OH=1.5, uniformly mixing, adding dimethylolbutyric acid (8 wt% of the mass of the polyethylene glycol ether), heating to 60 ℃, adding dibutyltin dilaurate (the addition amount is 2wt% of the mass of the polyethylene glycol ether), heating to 85 ℃, and stirring for reacting for 3 hours to obtain polyurethane prepolymer; and (3) cooling to 40 ℃, adding acetone to dilute the obtained polyurethane prepolymer, adding a polyvinyl alcohol aqueous solution (PVA 1799, wherein the added amount of the polyvinyl alcohol is 30wt% of the mass of the polyethylene glycol ether, and the content of the aqueous solution is 15 wt%) and heating to 90 ℃, and then continuously stirring and reacting for 2 hours to obtain the polyvinyl alcohol modified polyurethane, namely the water reducer.
The preparation method of the high-strength refractory castable specifically comprises the following steps: according to the proportion, the raw materials are weighed, the raw materials corresponding to the refractory aggregate, the powder, the binding agent and the fiber are firstly added into a stirrer for dry mixing, then the water reducing agent and the water are added for wet mixing, the obtained mixture is poured into a 40mm multiplied by 160mm mould and uniformly vibrated, naturally cured for 24 hours at room temperature, then demoulded, dried for 24 hours at 110 ℃, and subjected to heat preservation and heat treatment for 3 hours at 1100 ℃ under the air condition, thus obtaining the sample to be tested.
Example 3
The high-strength refractory castable comprises the following components in parts by weight: 45 parts of 1-6mm plate-shaped corundum, 25 parts of 0.088-1mm electro-fused white corundum, 10 parts of < 0.088mm electro-fused white corundum powder, 8 parts of alumina powder, 2 parts of silica micropowder, 3 parts of aluminate cement, 1 part of stainless steel fiber, 2 parts of aluminum silicate fiber, 0.2 part of water reducer and 3 parts of water;
the water reducer is polyvinyl alcohol modified polyurethane, and is prepared by the following method: adding polyethylene glycol ether (molecular weight 350) and toluene diisocyanate into a reaction kettle according to the ratio of NCO/OH=1.5, uniformly mixing, adding dimethylolbutyric acid (8 wt% of the mass of the polyethylene glycol ether), heating to 60 ℃, adding dibutyltin dilaurate (the addition amount is 2wt% of the mass of the polyethylene glycol ether), heating to 85 ℃, and stirring for reacting for 3 hours to obtain polyurethane prepolymer; and (3) cooling to 40 ℃, adding acetone to dilute the obtained polyurethane prepolymer, adding a polyvinyl alcohol aqueous solution (PVA 1799, wherein the added amount of the polyvinyl alcohol is 30wt% of the mass of the polyethylene glycol ether, and the content of the aqueous solution is 15 wt%) and heating to 90 ℃, and then continuously stirring and reacting for 2 hours to obtain the polyvinyl alcohol modified polyurethane, namely the water reducer.
The preparation method of the high-strength refractory castable specifically comprises the following steps: according to the proportion, the raw materials are weighed, the raw materials corresponding to the refractory aggregate, the powder, the binding agent and the fiber are firstly added into a stirrer for dry mixing, then the water reducing agent and the water are added for wet mixing, the obtained mixture is poured into a 40mm multiplied by 160mm mould and uniformly vibrated, naturally cured for 24 hours at room temperature, then demoulded, dried for 24 hours at 110 ℃, and subjected to heat preservation and heat treatment for 3 hours at 1100 ℃ under the air condition, thus obtaining the sample to be tested.
Example 4
The high-strength refractory castable comprises the following components in parts by weight: 45 parts of 1-6mm plate-shaped corundum, 15 parts of 0.088-1mm electro-fused white corundum, 15 parts of < 0.088mm electro-fused white corundum powder, 12 parts of alumina powder, 3 parts of silica micropowder, 4 parts of aluminate cement, 1 part of stainless steel fiber, 1 part of aluminum silicate fiber, 0.2 part of water reducer and 3 parts of water;
the water reducer is polyvinyl alcohol modified polyurethane, and is prepared by the following method: adding polyethylene glycol ether (molecular weight 350) and isophorone diisocyanate into a reaction kettle according to the ratio of NCO/OH=1.5, uniformly mixing, adding dimethylolbutyric acid (5 wt% of the mass of the polyethylene glycol ether), heating to 60 ℃, adding dibutyltin dilaurate (the addition amount is 2wt% of the mass of the polyethylene glycol ether), heating to 85 ℃, and stirring for reacting for 3 hours to obtain polyurethane prepolymer; and (3) cooling to 40 ℃, adding acetone to dilute the obtained polyurethane prepolymer, adding a polyvinyl alcohol aqueous solution (PVA 1799, wherein the added amount of the polyvinyl alcohol is 20wt% of the mass of the polyethylene glycol ether, and the content of the aqueous solution is 15 wt%) and heating to 90 ℃, and then continuously stirring and reacting for 2 hours to obtain the polyvinyl alcohol modified polyurethane, namely the water reducer.
The preparation method of the high-strength refractory castable specifically comprises the following steps: according to the proportion, the raw materials are weighed, the raw materials corresponding to the refractory aggregate, the powder, the binding agent and the fiber are firstly added into a stirrer for dry mixing, then the water reducing agent and the water are added for wet mixing, the obtained mixture is poured into a 40mm multiplied by 160mm mould and uniformly vibrated, naturally cured for 24 hours at room temperature, then demoulded, dried for 24 hours at 110 ℃, and subjected to heat preservation and heat treatment for 3 hours at 1100 ℃ under the air condition, thus obtaining the sample to be tested.
Comparative example 1
The high-strength refractory castable comprises the following components in parts by weight: 45 parts of 1-6mm plate-shaped corundum, 15 parts of 0.088-1mm electro-fused white corundum, 15 parts of < 0.088mm electro-fused white corundum powder, 12 parts of alumina powder, 3 parts of silica micropowder, 4 parts of aluminate cement, 1 part of stainless steel fiber, 1 part of aluminum silicate fiber, 0.2 part of water reducer and 3 parts of water; wherein the water reducing agent is sodium tripolyphosphate.
The preparation method of the high-strength refractory castable specifically comprises the following steps: according to the proportion, the raw materials are weighed, the raw materials corresponding to the refractory aggregate, the powder, the binding agent and the fiber are firstly added into a stirrer for dry mixing, then the water reducing agent and the water are added for wet mixing, the obtained mixture is poured into a 40mm multiplied by 160mm mould and uniformly vibrated, naturally cured for 24 hours at room temperature, then demoulded, dried for 24 hours at 110 ℃, and subjected to heat preservation and heat treatment for 3 hours at 1100 ℃ under the air condition, thus obtaining the sample to be tested.
Comparative example 2
The high-strength refractory castable comprises the following components in parts by weight: 45 parts of 1-6mm plate-shaped corundum, 15 parts of 0.088-1mm electro-fused white corundum, 15 parts of < 0.088mm electro-fused white corundum powder, 12 parts of alumina powder, 3 parts of silica micropowder, 4 parts of aluminate cement, 1 part of stainless steel fiber, 1 part of aluminum silicate fiber, 0.2 part of water reducer and 3 parts of water;
the water reducer is polyurethane and is prepared by the following method: adding polyethylene glycol ether (molecular weight 350) and toluene diisocyanate into a reaction kettle according to the ratio of NCO/OH=1.5, uniformly mixing, adding dimethylolbutyric acid (8 wt% of the mass of the polyethylene glycol ether), heating to 60 ℃, adding dibutyltin dilaurate (the addition amount is 2wt% of the mass of the polyethylene glycol ether), heating to 85 ℃, and stirring to react for 3 hours to obtain the polyurethane prepolymer, namely the water reducer.
The preparation method of the high-strength refractory castable specifically comprises the following steps: according to the proportion, the raw materials are weighed, the raw materials corresponding to the refractory aggregate, the powder, the binding agent and the fiber are firstly added into a stirrer for dry mixing, then the water reducing agent and the water are added for wet mixing, the obtained mixture is poured into a 40mm multiplied by 160mm mould and uniformly vibrated, naturally cured for 24 hours at room temperature, then demoulded, dried for 24 hours at 110 ℃, and subjected to heat preservation and heat treatment for 3 hours at 1100 ℃ under the air condition, thus obtaining the sample to be tested.
Experimental test:
the test pieces obtained in examples and comparative examples were measured for flexural strength according to GB/T3001-2007 standards, respectively, and the results are shown in Table 1.
Table 1 effect of performance test of high strength refractory castable obtained in examples and comparative examples
As can be seen from the table above, in the refractory castable, the water reducer of the invention has good fluidity, flexural strength and compressive strength compared with other water reducers applied to the system.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (11)
1. The high-strength refractory castable is characterized by comprising, by weight, 50-70 parts of refractory aggregate, 20-40 parts of powder and 1-10 parts of a binding agent;
wherein the refractory castable further comprises a water reducer, and the addition amount of the water reducer is 0.1-0.5wt% of the sum of the weight of refractory aggregate, powder and binding agent;
the water reducer is polyvinyl alcohol modified polyurethane, and is prepared by polycondensing hydroxyl monomers including dimethylol butyric acid and polyethylene glycol ether and isocyanate monomers to obtain polyurethane prepolymer, and then carrying out crosslinking reaction with polyvinyl alcohol.
2. The high strength refractory castable according to claim 1, wherein the isocyanate monomer is at least one of toluene diisocyanate, diphenylmethane diisocyanate, isophorone diisocyanate, or hexamethylene diisocyanate.
3. The high strength refractory castable according to claim 1, wherein the dimethylol butyric acid is added in an amount of 5 to 15wt% of the polyethylene glycol ether.
4. The high strength refractory castable according to claim 1, wherein the polyvinyl alcohol is added in an amount of 20 to 40wt% of the polyethylene glycol ether.
5. The high strength refractory castable according to any one of claims 1 to 4, wherein the refractory aggregate is at least one of corundum, alumina, or quartz.
6. The high strength refractory castable according to any one of claims 1 to 4, wherein the refractory aggregate has a particle size of 0.088 to 10mm.
7. The high-strength refractory castable according to any one of claims 1 to 4, wherein the powder is at least one of corundum powder, alumina powder, silica micropowder, chromia powder or zirconia powder.
8. The high strength refractory castable according to any one of claims 1 to 4, wherein the binder is aluminate cement having an alumina content of 50 to 80wt%.
9. The high strength refractory castable according to any one of claims 1 to 4, further comprising fibers added in an amount of 0.1 to 2wt% of the sum of the weight of the refractory aggregate, the powder and the binder.
10. The high strength refractory castable according to claim 9, wherein the fibers are organic fibers and/or inorganic fibers;
the organic fiber is polypropylene explosion-proof fiber, and the inorganic fiber is at least one of stainless steel fiber, aluminum silicate fiber, glass fiber or asbestos fiber.
11. A method for preparing the high-strength refractory castable according to any one of claims 1 to 8, wherein the refractory aggregate, the powder and the binder are dry-mixed in a mixer according to formula amounts, then the water reducer and the water are added for wet mixing, the obtained mixture is poured into a mould, and the high-strength refractory castable is obtained after vibration, demoulding and maintenance.
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| JPH09100172A (en) * | 1995-10-02 | 1997-04-15 | Kurosaki Refract Co Ltd | Basic castable refractory |
| US8841369B2 (en) * | 2011-03-30 | 2014-09-23 | Basf Se | Latently reactive polyurethane dispersion with activatable crosslinking |
| CN102491768A (en) * | 2011-12-06 | 2012-06-13 | 安徽瑞泰新材料科技有限公司 | Composite bonding wear-resistant castable refractory |
| CN103589135A (en) * | 2013-10-17 | 2014-02-19 | 常州大学 | Preparation method of polyvinyl alcohol modified waterborne polyurethane |
| CN103554408B (en) * | 2013-11-25 | 2015-08-12 | 淮南矿业(集团)有限责任公司 | Urethane slip casting strengthening material that polyvinyl alcohol fiber strengthens and preparation method thereof |
| CN106396709A (en) * | 2016-09-06 | 2017-02-15 | 武汉科技大学 | High-strength refractory castable and preparation method thereof |
| CN111234129A (en) * | 2020-03-14 | 2020-06-05 | 武汉善达化工有限公司 | High-performance organic metal type dispersant and preparation method thereof |
| CN111393602A (en) * | 2020-05-27 | 2020-07-10 | 安徽禾臣新材料有限公司 | Polyvinyl alcohol modified water-absorbent polyurethane and preparation method thereof |
| CN112390927A (en) * | 2020-10-30 | 2021-02-23 | 武汉善达化工有限公司 | Retarder for refractory material |
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