CN102500745B - Method for preparing full-mold casting coating - Google Patents
Method for preparing full-mold casting coating Download PDFInfo
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- CN102500745B CN102500745B CN 201110392571 CN201110392571A CN102500745B CN 102500745 B CN102500745 B CN 102500745B CN 201110392571 CN201110392571 CN 201110392571 CN 201110392571 A CN201110392571 A CN 201110392571A CN 102500745 B CN102500745 B CN 102500745B
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- 239000011248 coating agent Substances 0.000 title claims abstract description 45
- 238000000576 coating method Methods 0.000 title claims abstract description 45
- 238000010115 full-mold casting Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title abstract description 14
- 238000002156 mixing Methods 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 49
- 238000003756 stirring Methods 0.000 claims description 45
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 37
- 238000002360 preparation method Methods 0.000 claims description 28
- 235000013312 flour Nutrition 0.000 claims description 22
- 239000000843 powder Substances 0.000 claims description 22
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 21
- KBPLFHHGFOOTCA-UHFFFAOYSA-N 1-Octanol Chemical compound CCCCCCCCO KBPLFHHGFOOTCA-UHFFFAOYSA-N 0.000 claims description 20
- 229920001353 Dextrin Polymers 0.000 claims description 20
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 20
- FYGDTMLNYKFZSV-MRCIVHHJSA-N dextrin Chemical compound O[C@@H]1[C@@H](O)[C@H](O)[C@@H](CO)OC1O[C@@H]1[C@@H](CO)OC(O[C@@H]2[C@H](O[C@H](O)[C@H](O)[C@H]2O)CO)[C@H](O)[C@H]1O FYGDTMLNYKFZSV-MRCIVHHJSA-N 0.000 claims description 20
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 20
- 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 17
- 229940080314 sodium bentonite Drugs 0.000 claims description 17
- 229910000280 sodium bentonite Inorganic materials 0.000 claims description 17
- 239000000243 solution Substances 0.000 claims description 16
- 239000007788 liquid Substances 0.000 claims description 12
- 239000000377 silicon dioxide Substances 0.000 claims description 12
- 240000007817 Olea europaea Species 0.000 claims description 10
- 239000007864 aqueous solution Substances 0.000 claims description 10
- 229940067573 brown iron oxide Drugs 0.000 claims description 10
- 239000011521 glass Substances 0.000 claims description 10
- 229920005610 lignin Polymers 0.000 claims description 10
- WXMKPNITSTVMEF-UHFFFAOYSA-M sodium benzoate Chemical compound [Na+].[O-]C(=O)C1=CC=CC=C1 WXMKPNITSTVMEF-UHFFFAOYSA-M 0.000 claims description 10
- 235000010234 sodium benzoate Nutrition 0.000 claims description 10
- 239000004299 sodium benzoate Substances 0.000 claims description 10
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 10
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 10
- 239000004575 stone Substances 0.000 claims description 10
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 claims description 8
- 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 8
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 6
- 235000013339 cereals Nutrition 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 239000012467 final product Substances 0.000 claims description 5
- 238000005266 casting Methods 0.000 abstract description 10
- 229920003023 plastic Polymers 0.000 abstract description 4
- 239000004033 plastic Substances 0.000 abstract description 4
- 239000000654 additive Substances 0.000 abstract description 3
- 230000001680 brushing effect Effects 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 abstract description 3
- 239000012530 fluid Substances 0.000 abstract description 2
- 230000037303 wrinkles Effects 0.000 abstract description 2
- 239000006229 carbon black Substances 0.000 abstract 1
- 239000011247 coating layer Substances 0.000 abstract 1
- 230000008569 process Effects 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- 230000035699 permeability Effects 0.000 description 5
- 229910052708 sodium Inorganic materials 0.000 description 5
- 239000011734 sodium Substances 0.000 description 5
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 235000012216 bentonite Nutrition 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000003973 paint Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical group CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- 239000004604 Blowing Agent Substances 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- -1 carrier Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920006248 expandable polystyrene Polymers 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L sodium carbonate Substances [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 150000003460 sulfonic acids Chemical class 0.000 description 2
- 239000000375 suspending agent Substances 0.000 description 2
- KUAZQDVKQLNFPE-UHFFFAOYSA-N thiram Chemical compound CN(C)C(=S)SSC(=S)N(C)C KUAZQDVKQLNFPE-UHFFFAOYSA-N 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- 239000000080 wetting agent Substances 0.000 description 2
- 241000406668 Loxodonta cyclotis Species 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000012615 aggregate Substances 0.000 description 1
- 239000003125 aqueous solvent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 235000011182 sodium carbonates Nutrition 0.000 description 1
- 239000001488 sodium phosphate Substances 0.000 description 1
- 229910000162 sodium phosphate Inorganic materials 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical group [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Landscapes
- Mold Materials And Core Materials (AREA)
Abstract
The invention discloses a method for preparing a full-mold casting coating. The full-mold casting coating prepared by the method is high in anti-burn-on capacity and capable of improving rigidity and high-temperature resistance of molds, while cost is reduced to the utmost extent. A high-current rheological fluid is formed by optimizing blending of aggregates and various additives, and has better wettability and brushing property to foamed plastic molds. According to practices, the coating thickness of the coating can be at least 1.7mm after the coating is brushed by twice and is capable of meeting requirements for anti-burn-on capacity and transporting of large-size castings. The full-mold casting coating has excellent suspended property, thixotropy, breathabililty and higher surface strength, the method for preparing the full-mold casting coating is simple, convenient in operation and low in cost, and raw materials for preparing the full-mold casting coating are rich. In addition, surfaces of the full-mold castings produced by the full-mold casting coating are smooth and bright and free of defects of wrinkles, carbon black and the like, and coating layers on the surfaces are easy to be stripped and convenient to be cleaned.
Description
Technical field
The present invention relates to casting field, particularly the cavityless casting field.
Background technology
The disperse system that full-mold casting coating is comprised of the material of multiple different in kind, its composition mainly comprises the compositions such as refractory material, binding agent, carrier, suspending agent and special additive, needs coating that good processing performance, service behaviour, quality stability are arranged and applies reappearance.Full-mold casting coating is coated in the outer surface of foamed polystyrene pattern, could the moulding cast after the coating drying.Foamed plastics is airtight, and heat distortion temperature low (about about 70 ℃) is poor to the affinity of water; Liquid residue after foamed plastics melted by heating, the gasification is many, and gas forming amount is large, if these gases and liquid residue can not in time be discharged, foundry goods will produce the carbon defects such as gas, carburetting, Surface Wrinkle in iron.These characteristics have determined that full-mold paint should possess following performance requirement, and namely coating should have good wetability and being coated with property, good high-temperature resistant property and elevated temperature strength and good hot permeability.
About full-mold casting coating, more existing patent literatures, in the prior art, the patent No. is that 03134231.0 Chinese patent discloses a kind of negative pressure cavityless casting coating, its key material is 320 order zirconium English powder or 320 order silica flours or 320 order graphite; Binding agent is sodium phosphate or waterglass or polyvinyl formal and combination thereof; Solvent is water or ethanol; Wetting agent is acetone; Blowing agent is sodium alkyl sulfonate; The coating quality proportioning is: key material 70～80%, and binding agent 4～8%, wetting agent 0.8～1.2%, blowing agent: 1.4～2.0%, all the other are solvent.It is good that this coating has with the foamed plastics wettability, strong adhesion, the characteristics such as elevated temperature strength height and good permeability.The patent No. is that 02100867.1 Chinese patent discloses a kind of water-base paint specially for disappearing cast mold, it is by 700～850 parts of high silica flours, 150～300 parts of diatomite, 20～30 parts of boron-moisten soils, 0.5～2.0 parts of industrial sodium carbonates, 5～15 parts of sodium cellulosates, 30～40 parts of white glue with vinyl, 10～20 parts of aluminum sulfate, 20～30 parts of iron oxide, 20～30 parts of starch, 0.1～0.2 part of washing powder and 700～800 parts of water form, and it is good that this coating has wellability, brushability is good, it is good to become characteristic and trickling property, and coating is even, good permeability, intensity is high, fire resistance is good, and wearability is good, advantage and effect that shelling property is good.But, these two patented technology applicable craft scopes are vacuum full mold castings, the resistance to elevated temperatures of its coating is relatively poor, can only be fit to short finding (in the 200kg) of high-temperature process time and produce, then can not adapt to for the production of heavy castings (in 20 tons) and small lot handwork.The patent No. is the disclosed a kind of full-mold casting coating of the Chinese patent of 200510071854.X, this coating by aqueous solvent and solid content according to water: solid content is that 0.8～1: 1 mass ratio mixes; Wherein solid content be amorphous graphite, crystalline flake graphite, clay, polyvinyl acetate fat liquor according to 25: 5: 4.5: 6 mass ratio forms.This coating has the production technology that resistant to elevated temperatures performance can be applicable to heavy castings, but its manufacturing cost is higher, and can not be applicable to manual brushing, and this coating is black, easily causes the image of working environment black pollution.
Summary of the invention
For the deficiencies in the prior art, one of purpose of the present invention is to provide a kind of all have strong wearability, high tack, good gas permeability and the preparation method of drip-dry full-mold casting coating under high temperature, low temperature environment, can satisfy the heavy castings production requirement.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of preparation method of full-mold casting coating, this coating is comprised of following component in weight portion: silica flour 70-80 part, olive stone flour 10-15 part, schmigel 10-15 part, sodium bentonite 4-6 part, lignin sulfonic acid 1-2 part, dextrine powder 2-3 part, sodium carboxymethylcellulose 0.8-1.5 part, Sodium Benzoate 0.4-0.6 part, hollow glass micropearl 1-2 part, aluminum sulfate 7-9 part, polyvinyl alcohol 4-6 part, Ludox 5-6 part, brown iron oxide 0.5-0.8 part, n-octyl alcohol 0.04-0.06 part, water 15-25 part; Described preparation method comprises the steps:
1) sodium bentonite and dextrine powder are mixed with suitable quantity of water, stir, left standstill 36-48 hour, make sodium bentonite and dextrine powder water mixed liquid;
2) polyvinyl alcohol is mixed with suitable quantity of water, and fully stir, then leave standstill 30-60min, then slowly be heated to 75-95 ℃ and fully stirring, limpid to solution, without visible transparent grain, make polyvinyl alcohol water solution;
3) aluminum sulfate is mixed with suitable quantity of water, and stir, make aluminum sulfate aqueous solution;
4) remaining water is added in the reactor, open reactor, mixing speed is: 100-120r/min, in stirring downhill reaction still, add sodium carboxymethylcellulose, and heating slowly rises to 70-80 ℃ with the temperature of reactor, and constant temperature stirs 5-8min; With step 3) aluminum sulfate aqueous solution of preparation joins in the reactor and stirs;
5) silica flour, olive stone flour, schmigel, hollow glass micropearl and brown iron oxide are evenly mixed, then add while stirring step 4) reactor in;
6) then with Ludox and step 1) sodium bentonite and the dextrine powder water mixed liquid, step 2 of preparation) polyvinyl alcohol water solution of preparation mixes, and join the reactor high speed and stirred 120-150 minute;
7) in reactor, add lignin sulfonic acid, Sodium Benzoate and n-octyl alcohol, got final product in stirring at low speed 180-240 minute.
The present invention has following beneficial effect:
1) on the basis of great many of experiments, determined composition and separately the content of aggregate, suspending agent, bonding agent and the auxiliary material of coating, so that the effect between the above-mentioned each component reaches collaborative, the combination property of coating is improved.Full-mold casting coating of the present invention had both reached high anti-stick sand ability, rigidity and the resistance to elevated temperatures of raising apperance, minimized cost again.Optimization allotment through aggregate and various additives forms high current sex change fluid, all reaches better state with foamed polystyrene pattern wetability and brushability.Facts have proved that this coating just can reach the above paint thickness of 1.7mm through 2 times brushings, the anti-stick sand that can satisfy heavy castings requires and carries needs.
2) full-mold casting coating of the present invention has good suspension and thixotropy, also has good gas permeability and higher surface strength, and preparation technology is simple, easy to operate, abundant raw materials, production cost are low.Full mold cast(ing) surface with its production is bright and clean, without carbon defects such as elephant skin; Coating is easy to peel off, and is convenient to cleaning.
Coating of the present invention is suitable for the cavityless casting of large-sized iron casting.
The specific embodiment
Embodiment one
A kind of preparation method of full-mold casting coating, this coating is comprised of following component in weight portion: 70 parts of silica flours, 15 parts of olive stone flours, 10 parts of schmigels, 6 parts of sodium bentonites, 1 part of lignin sulfonic acid, 3 parts of dextrine powders, 0.8 part of sodium carboxymethylcellulose, 0.6 part of Sodium Benzoate, 1 part of hollow glass micropearl, 9 parts in aluminum sulfate, 4 parts of polyvinyl alcohol, 6 parts of Ludox, 0.5 part of brown iron oxide, 0.06 part of n-octyl alcohol, 15 parts in water; Described preparation method comprises the steps:
1) sodium bentonite and dextrine powder are mixed with suitable quantity of water, stir, left standstill 36 hours, make sodium bentonite and dextrine powder water mixed liquid;
2) polyvinyl alcohol is mixed with suitable quantity of water, and fully stir, then leave standstill 30min, then slowly be heated to 95 ℃ and fully stirring, limpid to solution, without visible transparent grain, make polyvinyl alcohol water solution;
3) aluminum sulfate is mixed with suitable quantity of water, and stir, make aluminum sulfate aqueous solution;
4) remaining water is added in the reactor, open reactor, mixing speed is: 100r/min, in stirring downhill reaction still, add sodium carboxymethylcellulose, and heating slowly rises to 80 ℃ with the temperature of reactor, and constant temperature stirs 5min; With step 3) aluminum sulfate aqueous solution of preparation joins in the reactor and stirs;
5) silica flour, olive stone flour, schmigel, hollow glass micropearl and brown iron oxide are evenly mixed, then add while stirring step 4) reactor in;
6) then with Ludox and step 1) sodium bentonite and the dextrine powder water mixed liquid, step 2 of preparation) polyvinyl alcohol water solution of preparation mixes, and join the reactor high speed and stirred 120 minutes;
7) add lignin sulfonic acid, Sodium Benzoate and n-octyl alcohol in reactor, stirring at low speed got final product in 180 minutes.
Embodiment two
A kind of preparation method of full-mold casting coating, this coating is comprised of following component in weight portion: 80 parts of silica flours, 10 parts of olive stone flours, 15 parts of schmigels, 4 parts of sodium bentonites, 2 parts of lignin sulfonic acids, 2 parts of dextrine powders, 1.5 parts of sodium carboxymethylcelluloses, 0.4 part of Sodium Benzoate, 2 parts of hollow glass micropearls, 7 parts in aluminum sulfate, 6 parts of polyvinyl alcohol, 5 parts of Ludox, 0.8 part of brown iron oxide, 0.04 part of n-octyl alcohol, 25 parts in water; Described preparation method comprises the steps:
1) sodium bentonite and dextrine powder are mixed with suitable quantity of water, stir, left standstill 48 hours, make sodium bentonite and dextrine powder water mixed liquid;
2) polyvinyl alcohol is mixed with suitable quantity of water, and fully stir, then leave standstill 30min, then slowly be heated to 95 ℃ and fully stirring, limpid to solution, without visible transparent grain, make polyvinyl alcohol water solution;
3) aluminum sulfate is mixed with suitable quantity of water, and stir, make aluminum sulfate aqueous solution;
4) remaining water is added in the reactor, open reactor, mixing speed is: 120r/min, in stirring downhill reaction still, add sodium carboxymethylcellulose, and heating slowly rises to 70 ℃ with the temperature of reactor, and constant temperature stirs 8min; With step 3) aluminum sulfate aqueous solution of preparation joins in the reactor and stirs;
5) silica flour, olive stone flour, schmigel, hollow glass micropearl and brown iron oxide are evenly mixed, then add while stirring step 4) reactor in;
6) then with Ludox and step 1) sodium bentonite and the dextrine powder water mixed liquid, step 2 of preparation) polyvinyl alcohol water solution of preparation mixes, and join the reactor high speed and stirred 150 minutes;
7) add lignin sulfonic acid, Sodium Benzoate and n-octyl alcohol in reactor, stirring at low speed got final product in 180 minutes.
Embodiment three
A kind of preparation method of full-mold casting coating, this coating is comprised of following component in weight portion: 75 parts of silica flours, 13 parts of olive stone flours, 13 parts of schmigels, 5 parts of sodium bentonites, 1.5 parts of lignin sulfonic acids, 2.5 parts of dextrine powders, 1.2 parts of sodium carboxymethylcelluloses, 0.5 part of Sodium Benzoate, 1.5 parts of hollow glass micropearls, 8 parts in aluminum sulfate, 5 parts of polyvinyl alcohol, 5.5 parts of Ludox, 0.6 part of brown iron oxide, 0.05 part of n-octyl alcohol, 20 parts in water; Described preparation method comprises the steps:
1) sodium bentonite and dextrine powder are mixed with suitable quantity of water, stir, left standstill 42 hours, make sodium bentonite and dextrine powder water mixed liquid;
2) polyvinyl alcohol is mixed with suitable quantity of water, and fully stir, then leave standstill 45min, then slowly be heated to 85 ℃ and fully stirring, limpid to solution, without visible transparent grain, make polyvinyl alcohol water solution;
3) aluminum sulfate is mixed with suitable quantity of water, and stir, make aluminum sulfate aqueous solution;
4) remaining water is added in the reactor, open reactor, mixing speed is: 110r/min, in stirring downhill reaction still, add sodium carboxymethylcellulose, and heating slowly rises to 75 ℃ with the temperature of reactor, and constant temperature stirs 6min; With step 3) aluminum sulfate aqueous solution of preparation joins in the reactor and stirs;
5) silica flour, olive stone flour, schmigel, hollow glass micropearl and brown iron oxide are evenly mixed, then add while stirring step 4) reactor in;
6) then with Ludox and step 1) sodium bentonite and the dextrine powder water mixed liquid, step 2 of preparation) polyvinyl alcohol water solution of preparation mixes, and join the reactor high speed and stirred 135 minutes;
7) add lignin sulfonic acid, Sodium Benzoate and n-octyl alcohol in reactor, stirring at low speed got final product in 210 minutes.
Applicant's statement, the present invention illustrates detailed process equipment and process flow process of the present invention by above-described embodiment, but the present invention is not limited to above-mentioned detailed process equipment and process flow process, does not mean that namely the present invention must rely on above-mentioned detailed process equipment and process flow process and could implement.The person of ordinary skill in the field should understand, any improvement in the present invention to the interpolation of the equivalence replacement of each raw material of product of the present invention and auxiliary element, the selection of concrete mode etc., all drops within protection scope of the present invention and the open scope.
Claims (1)
1. the preparation method of a full-mold casting coating, it is characterized in that, this coating is comprised of following component in weight portion: silica flour 70-80 part, olive stone flour 10-15 part, schmigel 10-15 part, sodium bentonite 4-6 part, lignin sulfonic acid 1-2 part, dextrine powder 2-3 part, sodium carboxymethylcellulose 0.8-1.5 part, Sodium Benzoate 0.4-0.6 part, hollow glass micropearl 1-2 part, aluminum sulfate 7-9 part, polyvinyl alcohol 4-6 part, Ludox 5-6 part, brown iron oxide 0.5-0.8 part, n-octyl alcohol 0.04-0.06 part, water 15-25 part; Described preparation method comprises the steps:
1) sodium bentonite and dextrine powder are mixed with suitable quantity of water, stir, left standstill 36-48 hour, make sodium bentonite and dextrine powder water mixed liquid;
2) polyvinyl alcohol is mixed with suitable quantity of water, and fully stir, then leave standstill 30-60min, then slowly be heated to 75-95 ℃ and fully stirring, limpid to solution, without visible transparent grain, make polyvinyl alcohol water solution;
3) aluminum sulfate is mixed with suitable quantity of water, and stir, make aluminum sulfate aqueous solution;
4) remaining water is added in the reactor, open reactor, mixing speed is: 100-120r/min, in stirring downhill reaction still, add sodium carboxymethylcellulose, and heating slowly rises to 70-80 ℃ with the temperature of reactor, and constant temperature stirs 5-8min; With step 3) aluminum sulfate aqueous solution of preparation joins in the reactor and stirs;
5) silica flour, olive stone flour, schmigel, hollow glass micropearl and brown iron oxide are evenly mixed, then add while stirring step 4) reactor in;
6) then with Ludox and step 1) sodium bentonite and the dextrine powder water mixed liquid, step 2 of preparation) polyvinyl alcohol water solution of preparation mixes, and join the reactor high speed and stirred 120-150 minute;
7) in reactor, add lignin sulfonic acid, Sodium Benzoate and n-octyl alcohol, got final product in stirring at low speed 180-240 minute.
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| CN102773405B (en) * | 2012-07-26 | 2015-10-28 | 宁夏共享集团有限责任公司 | A kind of production technology of casting sand mold water based paint |
| CN102836957A (en) * | 2012-08-31 | 2012-12-26 | 太仓科博尔精密铸业有限公司 | Lost foam coating and preparation method thereof |
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