CN110681817A - Preparation method of binder for pig iron investment casting - Google Patents
Preparation method of binder for pig iron investment casting Download PDFInfo
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- CN110681817A CN110681817A CN201910930169.XA CN201910930169A CN110681817A CN 110681817 A CN110681817 A CN 110681817A CN 201910930169 A CN201910930169 A CN 201910930169A CN 110681817 A CN110681817 A CN 110681817A
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- 239000011230 binding agent Substances 0.000 title claims abstract description 19
- 238000005495 investment casting Methods 0.000 title claims abstract description 16
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 229910000805 Pig iron Inorganic materials 0.000 title claims abstract description 12
- 239000004576 sand Substances 0.000 claims abstract description 35
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical class O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 31
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 28
- -1 sand compound Chemical class 0.000 claims description 20
- 238000003756 stirring Methods 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- 239000008367 deionised water Substances 0.000 claims description 15
- 229910021641 deionized water Inorganic materials 0.000 claims description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- ONCZQWJXONKSMM-UHFFFAOYSA-N dialuminum;disodium;oxygen(2-);silicon(4+);hydrate Chemical compound O.[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[O-2].[Na+].[Na+].[Al+3].[Al+3].[Si+4].[Si+4].[Si+4].[Si+4] ONCZQWJXONKSMM-UHFFFAOYSA-N 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 12
- 229940080314 sodium bentonite Drugs 0.000 claims description 12
- 229910000280 sodium bentonite Inorganic materials 0.000 claims description 12
- 238000000498 ball milling Methods 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 10
- 238000005406 washing Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- CMOAHYOGLLEOGO-UHFFFAOYSA-N oxozirconium;dihydrochloride Chemical compound Cl.Cl.[Zr]=O CMOAHYOGLLEOGO-UHFFFAOYSA-N 0.000 claims description 8
- IBZJNLWLRUHZIX-UHFFFAOYSA-N 1-ethyl-3-methyl-2h-imidazole Chemical class CCN1CN(C)C=C1 IBZJNLWLRUHZIX-UHFFFAOYSA-N 0.000 claims description 7
- ABMFBCRYHDZLRD-UHFFFAOYSA-N naphthalene-1,4-dicarboxylic acid Chemical compound C1=CC=C2C(C(=O)O)=CC=C(C(O)=O)C2=C1 ABMFBCRYHDZLRD-UHFFFAOYSA-N 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 5
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 5
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 5
- 229910000365 copper sulfate Inorganic materials 0.000 claims description 5
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical class [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims description 5
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 5
- 239000002244 precipitate Substances 0.000 claims description 5
- 238000010992 reflux Methods 0.000 claims description 5
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 5
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 5
- 238000012986 modification Methods 0.000 claims description 4
- 230000004048 modification Effects 0.000 claims description 4
- ZQIOYUJCFJBZAZ-UHFFFAOYSA-N chloro hypochlorite ethanol zirconium Chemical compound C(C)O.O(Cl)Cl.[Zr] ZQIOYUJCFJBZAZ-UHFFFAOYSA-N 0.000 claims description 2
- 238000005452 bending Methods 0.000 abstract description 15
- 238000005266 casting Methods 0.000 abstract description 13
- 230000035699 permeability Effects 0.000 abstract description 12
- 239000002245 particle Substances 0.000 abstract description 6
- 239000010437 gem Substances 0.000 abstract description 4
- 229910001751 gemstone Inorganic materials 0.000 abstract description 4
- 239000002131 composite material Substances 0.000 abstract description 3
- 238000010791 quenching Methods 0.000 abstract description 3
- 230000000171 quenching effect Effects 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 14
- 238000011056 performance test Methods 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 6
- 238000000576 coating method Methods 0.000 description 4
- 229940092782 bentonite Drugs 0.000 description 3
- 229910000278 bentonite Inorganic materials 0.000 description 3
- 239000000440 bentonite Substances 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 1
- 239000004111 Potassium silicate Substances 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229940077388 benzenesulfonate Drugs 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 229910001431 copper ion Inorganic materials 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 1
- BITYAPCSNKJESK-UHFFFAOYSA-N potassiosodium Chemical compound [Na].[K] BITYAPCSNKJESK-UHFFFAOYSA-N 0.000 description 1
- 229910052913 potassium silicate Inorganic materials 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 235000019982 sodium hexametaphosphate Nutrition 0.000 description 1
- 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 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 235000019832 sodium triphosphate Nutrition 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- LFQCEHFDDXELDD-UHFFFAOYSA-N tetramethyl orthosilicate Chemical compound CO[Si](OC)(OC)OC LFQCEHFDDXELDD-UHFFFAOYSA-N 0.000 description 1
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/18—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents
- B22C1/186—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of inorganic agents contaming ammonium or metal silicates, silica sols
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mold Materials And Core Materials (AREA)
- Silicates, Zeolites, And Molecular Sieves (AREA)
Abstract
The invention discloses a preparation method of a binder for pig iron investment casting, and particularly relates to the field of casting, wherein a shell prepared by using the binder has high mechanical property and good air permeability, can smoothly discharge gas during casting, and avoids the defects of air holes, insufficient casting and the like of a casting; the bentonite-jewel sand composite obtained by organically combining the bentonite-jewel sand composite prepared by repeatedly roasting and quenching jewel sand to prepare micron-level particles and modified bentonite has the advantages of better toughness and fluidity, better bonding property and lower thermal expansion coefficient, and the bending strength of a shell is enhanced after the shell is roasted.
Description
Technical Field
The invention belongs to the technical field of casting, and particularly relates to a preparation method of a binder for pig iron investment casting.
Background
Investment casting, which is a simple near-forming process, can be used for producing castings with high precision and complex shapes, usually adopts fusible materials to prepare fusible models, then refractory coatings and sand spraying are coated for a plurality of times to prepare shells, the shells are formed by procedures of drying, hardening and the like, the wax models are melted off by steam or hot water, then the shells are placed in a furnace for high-temperature roasting, the roasted shells are taken out, after being cooled, high-temperature molten metal is poured into the shells, and the required castings are obtained after the shells are removed. The binder is a main raw material for preparing the investment casting coating, not only influences the surface quality of a shell and a casting, but also has great influence on the whole investment casting production period and cost.
Patent (publication No. CN 106955966B) discloses an inorganic binder for casting and a preparation method thereof, wherein the preparation method comprises the step of adding methyl silicate, methyl silicone oil or sodium alkyl benzene sulfonate and sodium tripolyphosphate or sodium hexametaphosphate into sodium silicate or sodium potassium silicate at the temperature of 45 ~ 65 ℃ until a system is clear, but the strength of a shell prepared by the inorganic binder needs to be improved, the air permeability is poor, and the service performance of the shell is influenced.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a method for preparing a binder for investment casting of pig iron.
The invention is realized by the following technical scheme:
the preparation method of the binder for the pig iron investment casting specifically comprises the following steps:
(1) 20-25 parts of Baozhu sand by weight are put into a roasting furnace, roasted for 3-5h at the temperature of 300-;
(2) carrying out modification treatment on 30-35 parts of sodium bentonite to obtain modified bentonite;
(3) adding 30-35 parts of modified bentonite obtained in the step (2) into deionized water with the volume 5-7 times that of the modified bentonite, then adding 5-8 parts of copper sulfate, 15-20 parts of 1, 4-naphthalenedicarboxylic acid and 20-25 parts of Baozhu sand obtained in the step (1), stirring for 15-20min at the temperature of 50-60 ℃ and the speed of 200-230rpm, transferring into a reaction kettle, reacting for 12-15h at the temperature of 155-160 ℃, cooling, filtering, washing and drying to obtain a bentonite-Baozhu sand compound;
(4) adding 30-40 parts of bentonite-Baozhu sand compound obtained in the step (3) into deionized water with the volume 5-10 times of that of the bentonite-Baozhu sand compound, adding 5-10 parts of sodium carboxymethylcellulose, stirring and dispersing at 40-50 ℃ and 300-400rpm for 20-30min, then adding 80-120 parts of zirconium oxychloride ethanol solution, heating to 75-78 ℃, then dropwise adding 3-5% by mass of sodium hydroxide solution until no precipitate is generated, then adding shell powder and polyvinyl alcohol into the solution, and continuously stirring for 20-30min to obtain the modified zirconium dioxide sol.
Further, the preparation method of the modified bentonite in the step (2) comprises the following steps: 30-35 parts of sodium bentonite is placed in a ball milling tank, deionized water is added for ball milling for 15-20min, then 8-12 parts of brominated 1-ethyl-3-methylimidazole is added, reflux reaction is carried out for 7-10h at the temperature of 102 ℃ and 105 ℃ and at the speed of 200rpm and 300rpm under the protection of nitrogen, then cooling, filtering and drying at the temperature of 40-50 ℃ after washing are carried out, thus obtaining the modified bentonite.
Further, the mass fraction of the ethanol solution of zirconium oxychloride in the step (4) is 8-12%.
The invention has the beneficial effects that: the shell prepared by the binder has high mechanical property and good air permeability, can smoothly discharge gas during casting, and avoids the defects of air holes, insufficient casting and the like of a casting; according to the invention, the Baozhu sand is repeatedly roasted and quenched to prepare micron-level particles, the micron-level particles and the modified bentonite are prepared into a bentonite-Baozhu sand compound, the 1, 4-naphthalene dicarboxylic acid grafted by the modified bentonite reacts with hydroxyl on the surface of the Baozhu sand, so that the bentonite-Baozhu sand compound is organically combined, the obtained bentonite-Baozhu sand compound not only has better toughness and fluidity, but also has better bonding property, and meanwhile, the thermal expansion coefficient is lower, and after the shell is roasted, the bending strength of the shell is enhanced; the sodium bentonite is modified by brominated 1-ethyl-3-methylimidazole, 1-ethyl-3-methylimidazole cations enter between bentonite layers to enlarge the space between the bentonite layers, then added copper ions are complexed with nitrogen and oxygen atoms in 1-ethyl-3-methylimidazole and 1, 4-naphthalene dicarboxylic acid to obtain the modified bentonite, the space between the layers is further enlarged, and the adsorption and bonding properties are remarkably improved, so that the bonding properties of the binder are enhanced. The air permeability of the obtained shell is obviously improved by adding the shell powder.
Detailed Description
The invention is illustrated by the following specific examples, which are not intended to be limiting.
Example 1
The preparation method of the binder for the pig iron investment casting specifically comprises the following steps:
(1) 20 parts of Baozhu sand by weight are put into a roasting furnace, roasted for 3 hours at 300 ℃, taken out and quenched, then put into the roasting furnace, roasted for 1 hour at 400 ℃, taken out and quenched again, and then put into a high-energy ball mill, and ball-milled until the particle size is 1-10 mu m for later use;
(2) modifying 30 parts of sodium bentonite to obtain modified bentonite;
(3) adding 30 parts of modified bentonite obtained in the step (2) into deionized water with the volume 5 times that of the modified bentonite, then adding 5 parts of copper sulfate, 15 parts of 1, 4-naphthalene dicarboxylic acid and 20 parts of Baozhu sand obtained in the step (1), stirring for 15min at 50 ℃ and 200rpm, transferring into a reaction kettle, reacting for 12h at 155 ℃, cooling, filtering, washing and drying to obtain a bentonite-Baozhu sand compound;
(4) adding 30 parts of bentonite-Baozhu sand compound obtained in the step (3) into deionized water with the volume 5 times that of the bentonite-Baozhu sand compound, adding 5 parts of sodium carboxymethylcellulose, stirring and dispersing at 40 ℃ and 300rpm for 20min, then adding 80 parts of ethanol solution of zirconium oxychloride, heating to 75 ℃, then dropwise adding sodium hydroxide solution with the mass fraction of 3% into the ethanol solution until no precipitate is generated, then adding shell powder and polyvinyl alcohol into the ethanol solution, and continuously stirring for 20min to obtain the modified zirconium dioxide sol.
Further, the preparation method of the modified bentonite in the step (2) comprises the following steps: putting 30 parts of sodium bentonite into a ball milling tank, adding deionized water, ball milling for 15min, then adding 8 parts of brominated 1-ethyl-3-methylimidazole, carrying out reflux reaction for 7h at 102 ℃ and 200rpm under the protection of nitrogen, cooling, filtering, washing, and drying at 40 ℃ to obtain the modified bentonite.
Further, the mass fraction of the ethanol solution of zirconium oxychloride in the step (4) is 8%.
Through performance tests, the normal-temperature bending strength of the shell is 4.1MPa, the high-temperature bending strength at 900 ℃ is 5.9 MPa, and the shell is breathableThe sex was 1.31cm2/Pa·min。
Example 2
The preparation method of the binder for the pig iron investment casting specifically comprises the following steps:
(1) 22 parts of Baozhu sand by weight are put into a roasting furnace, roasted for 4 hours at 330 ℃, taken out and quenched, then put into the roasting furnace, roasted for 2 hours at 410 ℃, taken out and quenched again, and then put into a high-energy ball mill, and ball-milled until the particle size is 1-10 mu m for later use;
(2) carrying out modification treatment on 33 parts of sodium bentonite to obtain modified bentonite;
(3) adding 32 modified bentonite obtained in the step (2) into deionized water with the volume 6 times that of the bentonite, then adding 7 parts of copper sulfate, 18 parts of 1, 4-naphthalene dicarboxylic acid and 22 parts of the Baozhu sand obtained in the step (1), stirring at 55 ℃ and 220rpm for 18min, transferring into a reaction kettle, reacting at 158 ℃ for 14h, cooling, filtering, washing and drying to obtain a bentonite-Baozhu sand compound;
(4) adding 35 parts of bentonite-Baozhu sand compound obtained in the step (3) into deionized water with the volume 8 times that of the bentonite-Baozhu sand compound, adding 7 parts of sodium carboxymethylcellulose, stirring and dispersing at 45 ℃ and 350rpm for 25min, then adding 100 parts of an ethanol solution of zirconium oxychloride, heating to 76 ℃, then dropwise adding a sodium hydroxide solution with the mass fraction of 4% into the ethanol solution until no precipitate is generated, then adding shell powder and polyvinyl alcohol into the ethanol solution, and continuously stirring for 25min to obtain the modified zirconium dioxide sol.
Further, the preparation method of the modified bentonite in the step (2) comprises the following steps: putting 32 parts of sodium bentonite into a ball milling tank, adding deionized water, ball milling for 18min, then adding 10 parts of brominated 1-ethyl-3-methylimidazole, carrying out reflux reaction for 8h at 103 ℃ and 250rpm under the protection of nitrogen, cooling, filtering, washing, and drying at 45 ℃ to obtain the modified bentonite.
Further, the mass fraction of the ethanol solution of zirconium oxychloride in the step (4) is 10%.
Through performance test, the normal temperature bending strength of the shell is 4.2MPa, and the high temperature resistance of the shell is 900 DEG CBending strength of 6.1 MPa and air permeability of 1.33cm2/Pa·min。
Example 3
The preparation method of the binder for the pig iron investment casting specifically comprises the following steps:
(1) putting 25 parts of Baozhu sand by weight into a roasting furnace, roasting at 350 ℃ for 5 hours, taking out, quenching, putting into the roasting furnace, roasting at 420 ℃ for 2 hours, taking out, quenching, putting into a high-energy ball mill, and ball-milling until the particle size is 1-10 mu m for later use;
(2) modifying 35 parts of sodium bentonite to obtain modified bentonite;
(3) adding 35 parts of modified bentonite obtained in the step (2) into deionized water 7 times of the volume of the modified bentonite, then adding 8 parts of copper sulfate, 20 parts of 1, 4-naphthalene dicarboxylic acid and 25 parts of Baozhu sand obtained in the step (1), stirring at 60 ℃ and 230rpm for 20min, transferring into a reaction kettle, reacting at 160 ℃ for 15h, cooling, filtering, washing and drying to obtain a bentonite-Baozhu sand compound;
(4) adding 40 parts of bentonite-Baozhu sand compound obtained in the step (3) into deionized water with the volume being 10 times that of the bentonite-Baozhu sand compound, adding 10 parts of sodium carboxymethylcellulose, stirring and dispersing at 50 ℃ and 400rpm for 30min, then adding 120 parts of ethanol solution of zirconium oxychloride, heating to 78 ℃, then dropwise adding sodium hydroxide solution with the mass fraction being 5% into the ethanol solution until no precipitate is generated, then adding shell powder and polyvinyl alcohol into the ethanol solution, and continuously stirring for 30min to obtain the modified zirconium dioxide sol.
Further, the preparation method of the modified bentonite in the step (2) comprises the following steps: putting 35 parts of sodium bentonite into a ball milling tank, adding deionized water, ball milling for 20min, then adding 12 parts of brominated 1-ethyl-3-methylimidazole, carrying out reflux reaction for 10h at 105 ℃ and 300rpm under the protection of nitrogen, cooling, filtering, washing, and drying at 50 ℃ to obtain the modified bentonite.
Further, the mass fraction of the ethanol solution of zirconium oxychloride in the step (4) is 12%.
The performance test shows that the shell has strong bending resistance at normal temperatureThe degree is 4.0MPa, the bending strength at 900 ℃ is 5.9 MPa, and the air permeability is 1.32cm2/Pa·min。
Comparative example 1
In this comparative example, the procedure was the same as in example 2 except that the modification treatment of sodium bentonite was omitted.
Through performance tests, the normal-temperature bending strength of the shell is 3.2MPa, the high-temperature bending strength at 900 ℃ is 4.8 MPa, and the air permeability is 1.28m2/Pa·min。
Comparative example 2
The procedure of this comparative example was the same as that of example 2 except that the addition of the bentonite-jewel sand composite was omitted.
Through performance tests, the normal-temperature bending strength of the shell is 2.5MPa, the high-temperature bending strength at 900 ℃ is 4.3MPa, and the air permeability is 1.26cm2/Pa·min。
Comparative example 3
This comparative example compared to example 2, the procedure was the same except that the addition of shell powder was omitted.
Through performance tests, the normal-temperature bending strength of the shell is 4.0MPa, the high-temperature bending strength at 900 ℃ is 5.7 MPa, and the air permeability is 0.88cm2/Pa·min。
The performance test of the application specifically comprises the following steps:
preparing a shell: adding 25% of refractory material (in the test, 75% of silicon dioxide, 20% of aluminum oxide and 5% of calcium oxide) into the binder, uniformly stirring to obtain slurry, uniformly coating the slurry on the surface of a wax mold, wherein the thickness of a coating film is 8mm, drying at room temperature, uniformly binding by using iron wires, fixing, standing for 3 hours, and roasting at 900 ℃ for 120min to obtain the casting shell.
The JB/T4153-1999 Shell high temperature Permeability determination method adopts Ping-Pong spherical shell sample, places the sample in the furnace of the Shell high temperature Permeability determination apparatus, opens the oilless air compressor, adjusts the pressure to 0.2 ~ 0.25.25 MPa, opens the flowmeter and the two-way valve in front of the sample, makes the pressure at 0.01 ~ 0.05MPa, records the gas flow from room temperature to 1300 ℃ every 50 ℃ (keeping the temperature for 15 min), calculates the Shell Permeability, repeats the determination for 5 times for each group of 5 samples, and takes the average value.
The room temperature bending strength and the 900 ℃ high temperature bending strength of each group of obtained shells were measured according to HB5352-2004 "test method for investment casting shell performance". Each set of 5 specimens, each specimen was tested 5 times and the average was taken.
Claims (3)
1. The preparation method of the binder for pig iron investment casting is characterized by comprising the following steps:
(1) 20-25 parts of Baozhu sand by weight are put into a roasting furnace, roasted for 3-5h at the temperature of 300-;
(2) carrying out modification treatment on 30-35 parts of sodium bentonite to obtain modified bentonite;
(3) adding 30-35 parts of modified bentonite obtained in the step (2) into deionized water with the volume 5-7 times that of the modified bentonite, then adding 5-8 parts of copper sulfate, 15-20 parts of 1, 4-naphthalenedicarboxylic acid and 20-25 parts of Baozhu sand obtained in the step (1), stirring for 15-20min at the temperature of 50-60 ℃ and the speed of 200-230rpm, transferring into a reaction kettle, reacting for 12-15h at the temperature of 155-160 ℃, cooling, filtering, washing and drying to obtain a bentonite-Baozhu sand compound;
(4) adding 30-40 parts of bentonite-Baozhu sand compound obtained in the step (3) into deionized water with the volume 5-10 times of that of the bentonite-Baozhu sand compound, adding 5-10 parts of sodium carboxymethylcellulose, stirring and dispersing at 40-50 ℃ and 300-400rpm for 20-30min, then adding 80-120 parts of zirconium oxychloride ethanol solution, heating to 75-78 ℃, then dropwise adding 3-5% by mass of sodium hydroxide solution until no precipitate is generated, then adding shell powder and polyvinyl alcohol into the solution, and continuously stirring for 20-30min to obtain the modified zirconium dioxide sol.
2. The method for preparing the binder for pig iron investment casting according to claim 1, wherein the modified bentonite in the step (2) is prepared by the following steps: 30-35 parts of sodium bentonite is placed in a ball milling tank, deionized water is added for ball milling for 15-20min, then 8-12 parts of brominated 1-ethyl-3-methylimidazole is added, reflux reaction is carried out for 7-10h at the temperature of 102 ℃ and 105 ℃ and at the speed of 200rpm and 300rpm under the protection of nitrogen, then cooling, filtering and drying at the temperature of 40-50 ℃ after washing are carried out, thus obtaining the modified bentonite.
3. The method for preparing the binder for investment casting pig iron according to claim 1, wherein the mass fraction of the ethanol solution of zirconium oxychloride in the step (4) is 8-12%.
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| CN104801656A (en) * | 2015-04-01 | 2015-07-29 | 江守仲 | Highly fire-resistant foundry sand for steel casting and preparation method of highly fire-resistant foundry sand |
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| CN108941442A (en) * | 2018-09-15 | 2018-12-07 | 台州进亿成再生资源回收有限公司 | A kind of steel-casting resin sand and preparation method thereof and application method |
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| US4529028A (en) * | 1981-11-13 | 1985-07-16 | Farley Metals, Inc. | Coating for molds and expendable cores |
| US20080245262A1 (en) * | 2004-09-15 | 2008-10-09 | Reinhard Stotzel | Thixotropic Coating Materials |
| CN101844206A (en) * | 2009-03-27 | 2010-09-29 | 铃木株式会社 | Collapsibility mould and make the method for this collapsibility mould |
| CN104057014A (en) * | 2014-05-28 | 2014-09-24 | 安徽鑫润新型材料有限公司 | Gray iron casting moulding sand and preparation method thereof |
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