CN103551498B - Resin bonded sand mould penetration-prevention alcohol-base foundry coating and preparation method thereof - Google Patents
Resin bonded sand mould penetration-prevention alcohol-base foundry coating and preparation method thereof Download PDFInfo
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- CN103551498B CN103551498B CN201310562936.9A CN201310562936A CN103551498B CN 103551498 B CN103551498 B CN 103551498B CN 201310562936 A CN201310562936 A CN 201310562936A CN 103551498 B CN103551498 B CN 103551498B
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- 239000011248 coating agent Substances 0.000 title claims abstract description 84
- 238000000576 coating method Methods 0.000 title claims abstract description 84
- 239000004576 sand Substances 0.000 title claims abstract description 35
- 229920005989 resin Polymers 0.000 title claims abstract description 33
- 239000011347 resin Substances 0.000 title claims abstract description 33
- 238000002360 preparation method Methods 0.000 title claims abstract 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 abstract description 73
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 44
- 239000000843 powder Substances 0.000 claims abstract description 25
- 238000002156 mixing Methods 0.000 claims abstract description 19
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 claims abstract description 12
- 239000004113 Sepiolite Substances 0.000 claims abstract description 11
- 229910052624 sepiolite Inorganic materials 0.000 claims abstract description 11
- 235000019355 sepiolite Nutrition 0.000 claims abstract description 11
- 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 abstract description 10
- 229940080314 sodium bentonite Drugs 0.000 claims abstract description 10
- 229910000280 sodium bentonite Inorganic materials 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000005011 phenolic resin Substances 0.000 claims abstract description 8
- 229920001568 phenolic resin Polymers 0.000 claims abstract description 8
- 239000002994 raw material Substances 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims description 19
- 239000000654 additive Substances 0.000 claims description 12
- 230000000996 additive effect Effects 0.000 claims description 12
- 239000012535 impurity Substances 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 230000003647 oxidation Effects 0.000 claims description 4
- 238000007254 oxidation reaction Methods 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 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 claims description 2
- 229910052708 sodium Inorganic materials 0.000 claims description 2
- 239000011734 sodium Substances 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 9
- 230000035699 permeability Effects 0.000 abstract description 9
- 239000010959 steel Substances 0.000 abstract description 9
- 239000000725 suspension Substances 0.000 abstract description 8
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052726 zirconium Inorganic materials 0.000 abstract description 5
- 239000003973 paint Substances 0.000 abstract description 3
- 230000000149 penetrating effect Effects 0.000 abstract 1
- 238000005266 casting Methods 0.000 description 13
- 238000005245 sintering Methods 0.000 description 9
- YLQBMQCUIZJEEH-UHFFFAOYSA-N Furan Chemical compound C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 8
- 238000009749 continuous casting Methods 0.000 description 7
- 206010039509 Scab Diseases 0.000 description 6
- 230000008595 infiltration Effects 0.000 description 5
- 238000001764 infiltration Methods 0.000 description 5
- 239000006185 dispersion Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000004901 spalling Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 235000013312 flour Nutrition 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000000375 suspending agent Substances 0.000 description 2
- 239000002562 thickening agent Substances 0.000 description 2
- 229910052845 zircon Inorganic materials 0.000 description 2
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical group [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 239000010431 corundum Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 239000004503 fine granule Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
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- Mold Materials And Core Materials (AREA)
Abstract
The invention discloses a kind of resin bonded sand mould penetration-prevention alcohol-base foundry coating and preparation method thereof.Its raw material is composed of the following components according to percentage by weight: mixing order pink fused alumina 7.3 ~ 48.8%, 200 order pink fused aluminas 8.1 ~ 38.9%, 325 order pink fused alumina 7.7 ~ 22.5%, 325 order white fused aluminas 7.5 ~ 29.1%, sepiolite 0.72 ~ 1.5%, sodium bentonite 1.5 ~ 3%, polyvinyl butyral resin 0.3 ~ 0.5%, phenolic resins 0.36 ~ 0.97%, 325 order agstones 0.72 ~ 1.62%, water 0.36 ~ 0.75%, ethanol 12.1 ~ 21.8%.Cast paint of the present invention containing zirconium English powder, does not have obvious price advantage compared with zirconium English powder, and raw material resources is extensive, and cost performance is high.Coating suspension of the present invention is very good, and coating compactness is higher, good air permeability, has very strong to resist molten steel penetrating power.
Description
Technical field
The present invention relates to resin bonded sand mould alcohol-base foundry coating, refer to a kind of resin bonded sand mould penetration-prevention alcohol-base foundry coating and preparation method thereof particularly.
Background technology
In the last few years, resin bonded sand mould casting can improve surface quality of continuous castings, made it apply more and more extensive.In resin bonded sand mould casting, to be widely used and the best cast paint of result of use is zircon flour coating.But when casting, the especially casting of high-alloy steel, stainless steel or large-scale steel-casting etc., is easy to produce scab or serious resisting penetration phenomenon.And zirconium English powder is few in china natural resources, mainly by import, price is very expensive.
At present, in order to reduce coating cost, all or part of alternative materials in zircon flour coating, is added.But application shows, coating refractoriness reduces, and coating anti-burnon poor effect, causes surface quality of continuous castings very undesirable, not only increase the unproductive time of casting cleaning, also improve labor strength, indirectly improve cost on the contrary.
Summary of the invention
Object of the present invention is exactly to overcome the deficiency existing for prior art, provides the resin bonded sand mould penetration-prevention alcohol-base foundry coating and preparation method thereof of the densification of a kind of coating, good permeability, good, the easy stripping of sintering character, low cost.
For achieving the above object, resin bonded sand mould penetration-prevention alcohol-base foundry coating of the present invention, its raw material is composed of the following components according to percentage by weight:
In the present invention, described mixing order pink fused alumina forms according to the powder of percentage by weight by following granularity:
70 order pink fused alumina 4 ~ 10%, 100 order pink fused aluminas 3 ~ 14%,
140 order pink fused alumina 18 ~ 25%, 200 order pink fused aluminas 22 ~ 31%,
270 order pink fused alumina 16 ~ 29%, 320 order pink fused aluminas 8 ~ 20%.
In the present invention, the pink fused alumina that described pink fused alumina selects impurity content higher, wherein, oxidation of impurities sodium is 1 ~ 5%, and oxidation of impurities iron is 1 ~ 5%.
In the present invention, the delivery time of described polyvinyl butyral resin is 130 ~ 150 seconds.Delivery time, that is, under uniform temperature condition, measure the time that quantitative sample all flows out from the hole of specified diameter, the viscosity of coating and other Related product is measured in usual painting-4 glasss.
Present invention also offers the preparation method of above-mentioned resin bonded sand mould penetration-prevention alcohol-base foundry coating, comprise the following steps:
The first step, will mix order pink fused alumina in proportion and mix with 200 order pink fused aluminas, 325 order pink fused aluminas, 325 order white fused aluminas, obtain refractory powder, for subsequent use;
Second step, gets sepiolite, adds the equiponderant ethanol with sepiolite and disperses, then adds water in proportion and fully stir, and obtains paste, stand-by;
3rd step, by obtained paste and the sodium bentonite added in proportion, polyvinyl butyral resin, agstone, phenolic resins and the ethanol mix and blend accounting for total ethanol consumption 18 ~ 50%, mixing time is 2 hours, obtains coating additive, stand-by;
4th step, mixes the coating additive of the refractory powder of first step gained and the 3rd step gained, then is added by residue ethanol, mixed grind 2 ~ 3 hours, obtain resin bonded sand mould penetration-prevention alcohol-base foundry coating.
In the present invention, described mixing order pink fused alumina is that 1 ~ 2mm pink fused alumina sand is broken into mixing object powder by granularity.
A kind of corundum of low cost selected by the main body refractory aggregate that the present invention uses, and its main component is aluminium oxide, chromium oxide, also has other impurity.In order to reduce the impact of its impurity, very important to the control of granularity.The powder particles that general coating uses is 325 orders, because low-melting impurities is mainly distributed in grain boundaries, powder is thinner, and impurity is fractured into less particle from grain boundaries, enters powder, its harm is larger, therefore suitably improve the granularity of powder, or part improves the granularity of powder, is broken into partial particulate and is greater than 325 objects, just impurity can be retained in grain boundaries, reduce its impact on refractoriness.Large or fine granule mixing simultaneously, makes coating finer and close, and coating particles is more prone to contact, easily sinters fine and close dope layer into, strengthens the ability of its opposing molten steel infiltration, stops the infiltration of molten steel, play the effect of Sand sticking-resistant.In addition, part high cleanliness white fused alumina is added to dilute the impact of impurity.
But the collocation of the thickness of coating aggregate also can bring following point: one is that coarse granule aggregate will seriously reduce the suspension of coating, two is that the collocation of different grain size aggregate also can reduce coating's permeability, coating on resin sand, good adhesive force should be had, the gas permeability had again, when resinoid bond in mo(U)ld face resin sand is through high-temperature molten steel effect, a large amount of gas can be produced instantaneously, need to discharge through dope layer, when coating gas permeability is very poor, gas can be assembled at coating backside very soon, pressure improves rapidly, gas is finally from local penetration, coating is made to produce distortion, even wash out coating, the result of distortion forms water ripples or pit defect at cast(ing) surface, coating shedding then causes foundry goods scab defect, three is thickness collocation aggregates, and in its dope layer, particles of aggregates is close to each other tighter, and density is high, and when being subject to high temperature action, the expansion of coating cannot coatedly absorb, and causes coating shape even ftracture or come off, thus has a strong impact on surface quality of continuous castings.
The present invention adopts the mixture of sodium bentonite and high-expansion Magnesiumaluminumsilicate complex salt to make suspending agent, and full-bodied polyvinyl butyral resin selected by thickener, solves suspension problem with this; Add in coating and at high temperature easily produce volatile material, to increase the sponginess of coating, the space that volatile materials stays is very little, can not cause the infiltration of molten steel, to solve coating's permeability difference and to hold yielding problem.
The present invention adopts the sepiolite mixture of sodium bentonite and water-swellable to make suspending agent, and full-bodied polyvinyl butyral resin selected by thickener, solves suspension problem with this; Add in coating and at high temperature easily produce volatile agstone, the space that volatile materials stays is very little, adds the gas permeability of dope layer, but can not cause the infiltration of molten steel, to solve the problem of coating's permeability difference and easy strain cracking.
Beneficial effect of the present invention is: coating of the present invention possesses extraordinary suspension, higher coating compactness, good gas permeability, there is the very strong ability resisting molten steel infiltration, be applied on resin bonded sand mould, be applicable to casting large heavy wall cast steel, ironcasting, also casting stainless steel is applicable to, heat resisting steel, high alloy iron, potassium steel etc.After cast, coating forms the coating easily peeled off, and cast(ing) surface is bright and clean, and roughness is low, and casting dimension accuracy is high.Cast paint of the present invention containing zirconium English powder, does not have obvious price advantage compared with zirconium English powder, and raw material resources is extensive, and cost performance is high, and product has broad application prospects.
Detailed description of the invention
In order to explain the present invention better, below in conjunction with specific embodiment, the present invention is described in further detail, but they do not form restriction to the present invention.
Embodiment 1
Preparation coating 100 kilograms.
The first step: be the mixing order pink fused alumina 7.3Kg that 1 ~ 2mm pink fused alumina sand is broken into containing 70 order pink fused alumina 0.35kg, 100 order pink fused alumina 0.46kg, 140 order pink fused alumina 1.5kg, 200 order pink fused alumina 2kg, 270 order pink fused alumina 2kg, 320 order pink fused alumina 0.99kg by granularity, order pink fused alumina and 200 order pink fused alumina 21.8Kg will be mixed, 325 order pink fused alumina 14.5Kg, 325 order white fused alumina 29.1Kg mix, obtain refractory powder, for subsequent use;
Second step: get sepiolite 0.72Kg, add ethanol 0.72Kg and mix dispersion together, then add water 0.36Kg, fully stir, mixing time is 20 minutes, obtains highly bulked paste, stand-by;
3rd step: by above-mentioned obtained highly bulked paste and sodium bentonite 3Kg, polyvinyl butyral resin 0.34Kg, phenolic resins 0.36Kg, 325 order agstone 0.72Kg, ethanol 5.08Kg mix, stir evenly at a high speed and namely obtain coating additive in about 2 hours, stand-by;
4th step: add in kolleroang by the refractory powder of first step gained together with the coating additive of the 3rd step gained, added by residue 16Kg ethanol, mixing time 3 hours, obtains resin bonded sand mould penetration-prevention alcohol-base foundry coating.
Get above-mentioned coating 5 samples preparing gained, detect 2 hours suspensibilities, then average, under furan resin-sand condition, coating is for pouring into a mould the large-scale steel-casting of 10 tons of weights, wall thickness 250mm, and its Sand sticking-resistant and any surface finish situation, coating sintering peeling conditions is as shown in table 1.
The testing result of table 1 embodiment 1
| 2 hours suspensibilities, % | Surface quality of continuous castings | Coating sintering spalling |
| 100 | Bright and clean, not scab | Cast(ing) surface coating is that bulk is peeled off |
Embodiment 2
Preparation coating 100 kilograms.
The first step: be the mixing order pink fused alumina 15Kg that 1 ~ 2mm pink fused alumina sand is broken into containing 70 order pink fused alumina 1.05kg, 100 order pink fused alumina 1.5kg, 140 order pink fused alumina 3kg, 200 order pink fused alumina 3.6kg, 270 order pink fused alumina 3.75kg, 320 order pink fused alumina 2.1kg by granularity, order pink fused alumina and 200 order pink fused alumina 30Kg will be mixed, 325 order pink fused alumina 22.5Kg, 325 order white fused alumina 7.5Kg mix, obtain refractory powder, for subsequent use;
Second step: get sepiolite 1.2Kg, add ethanol 1.2Kg and mix dispersion together, then add water 0.5Kg, fully stir, mixing time is 20 minutes, obtains highly bulked paste, stand-by;
3rd step: mixed with sodium bentonite 2.7Kg, polyvinyl butyral resin 0.3Kg, phenolic resins 0.5Kg, 325 order agstone 1.1Kg, ethanol 3.5Kg by above-mentioned obtained highly bulked paste, stirs evenly at a high speed and namely obtains coating additive in about 2 hours, stand-by;
4th step: just the refractory powder of first step gained adds in kolleroang together with the coating additive of the 3rd step gained, is added by residue 14Kg ethanol, mixing time 3 hours obtains resin bonded sand mould penetration-prevention alcohol-base foundry coating.
Get above-mentioned coating 5 samples preparing gained, detect 2 hours suspensions, then average, under furan resin-sand condition, coating is for pouring into a mould 10 tons of weights, the large-scale steel-casting of wall thickness 250mm, its Sand sticking-resistant and any surface finish situation, coating sintering peeling conditions is as shown in table 2.
The testing result of table 2 embodiment 2
| 2 hours suspensibilities, % | Surface quality of continuous castings | Coating sintering spalling |
| 98 | Bright and clean, not scab | Cast(ing) surface coating is that bulk is peeled off |
Embodiment 3
Preparation coating 100 kilograms.
The first step: be the mixing order pink fused alumina 23.8Kg that 1 ~ 2mm pink fused alumina sand is broken into containing 70 order pink fused alumina 2.1kg, 100 order pink fused alumina 2.1kg, 140 order pink fused alumina 5kg, 200 order pink fused alumina 5.7kg, 270 order pink fused alumina 6.4kg, 320 order pink fused alumina 2.5kg by granularity, order pink fused alumina and 200 order pink fused alumina 38.9Kg will be mixed, 325 order pink fused alumina 7.7Kg, 325 order white fused alumina 7.7Kg mix, obtain refractory powder, for subsequent use;
Second step: get sepiolite 1.5Kg, add ethanol 1.5Kg and mix dispersion together, then add water 0.75Kg, fully stir, mixing time is 20 minutes, obtains highly bulked paste, stand-by;
3rd step: mixed with sodium bentonite 1.5Kg, polyvinyl butyral resin 0.4Kg, phenolic resins 0.75Kg, 325 order agstone 1.5Kg, ethanol 5Kg by above-mentioned obtained highly bulked paste, stirs evenly at a high speed and namely obtains coating additive in about 2 hours, stand-by;
4th step: add in kolleroang together with the coating additive of the 3rd step gained by the refractory powder of first step gained, adds stirring 3 hours by residue ethanol 9Kg, obtains resin bonded sand mould penetration-prevention alcohol-base foundry coating.
Get above-mentioned coating 5 samples preparing gained, detect 2 hours suspensions, then average, under furan resin-sand condition, coating is for pouring into a mould 10 tons of weights, the large-scale steel-casting of wall thickness 250mm, its Sand sticking-resistant and any surface finish situation, coating sintering peeling conditions is as shown in table 3.
The testing result of table 3 embodiment 3
| 2 hours suspensibilities, % | Surface quality of continuous castings | Coating sintering spalling |
| 97 | Bright and clean, not scab | Cast(ing) surface coating is that bulk is peeled off |
Embodiment 4
Preparation coating 100 kilograms.
The first step: be the mixing order pink fused alumina 48.8Kg that 1 ~ 2mm pink fused alumina sand is broken into containing 70 order pink fused alumina 2.5kg, 100 order pink fused alumina 3.9kg, 140 order pink fused alumina 11.7kg, 200 order pink fused alumina 13.6kg, 270 order pink fused alumina 10.7kg, 320 order pink fused alumina 6.4kg by granularity, order pink fused alumina and 200 order pink fused alumina 8.1Kg will be mixed, 325 order pink fused alumina 8.1Kg, 325 order white fused alumina 16.2Kg mix, obtain refractory powder, for subsequent use;
Second step: get sepiolite 0.81Kg, add ethanol 0.81Kg and mix dispersion together, then add water 0.4Kg, fully stir, mixing time is 20 minutes, obtains highly bulked paste, stand-by;
3rd step: mixed with sodium bentonite 2.4Kg, polyvinyl butyral resin 0.5Kg, phenolic resins 0.97Kg, 325 order agstone 1.62Kg, ethanol 6Kg by above-mentioned obtained highly bulked paste, stirs evenly at a high speed and namely obtains coating additive in about 2 hours, stand-by;
4th step: add in kolleroang by the refractory powder of first step gained together with the coating additive of the 3rd step gained, added by residue 5.29Kg ethanol, stirs 3 hours, obtains resin bonded sand mould penetration-prevention alcohol-base foundry coating.
Get above-mentioned coating 5 samples preparing gained, detect 2 hours suspensions, then average, under furan resin-sand condition, coating is for pouring into a mould 10 tons of weights, the large-scale steel-casting of wall thickness 250mm, its Sand sticking-resistant and any surface finish situation, coating sintering peeling conditions is as shown in table 4.
The testing result of table 4 embodiment 4
| 2 hours suspensibilities, % | Surface quality of continuous castings | Coating sintering spalling |
| 96 | Bright and clean, not scab | Cast(ing) surface coating is that bulk is peeled off |
Claims (2)
1. a resin bonded sand mould penetration-prevention alcohol-base foundry coating, is characterized in that: its raw material is composed of the following components according to percentage by weight:
Mixing order pink fused alumina 7.3 ~ 48.8%, 200 order pink fused alumina 8.1 ~ 38.9%,
325 order pink fused alumina 7.7 ~ 22.5%, 325 order white fused aluminas 7.5 ~ 29.1%,
Sepiolite 0.72 ~ 1.5%, sodium bentonite 1.5 ~ 3%,
Polyvinyl butyral resin 0.3 ~ 0.5%, phenolic resins 0.36 ~ 0.97%,
325 order agstones 0.72 ~ 1.62%, water 0.36 ~ 0.75%, ethanol 12.1 ~ 21.8%; Wherein, described mixing order pink fused alumina forms according to the powder of percentage by weight by following granularity:
70 order pink fused alumina 4 ~ 10%, 100 order pink fused aluminas 3 ~ 14%,
140 order pink fused alumina 18 ~ 25%, 200 order pink fused aluminas 22 ~ 31%,
270 order pink fused alumina 16 ~ 29%, 320 order pink fused aluminas 8 ~ 20%;
The pink fused alumina that described pink fused alumina selects impurity content higher, wherein, oxidation of impurities sodium is 1 ~ 5%, and oxidation of impurities iron is 1 ~ 5%;
The delivery time of described polyvinyl butyral resin is 130 ~ 150 seconds.
2. a resin bonded sand mould preparation method for penetration-prevention alcohol-base foundry coating as claimed in claim 1, is characterized in that, comprise the following steps:
The first step, will mix order pink fused alumina in proportion and mix with 200 order pink fused aluminas, 325 order pink fused aluminas, 325 order white fused aluminas, obtain refractory powder, for subsequent use;
Second step, gets sepiolite, adds the equiponderant ethanol with sepiolite and disperses, then adds water in proportion and fully stir, and obtains paste, stand-by;
3rd step, by obtained paste and the sodium bentonite added in proportion, polyvinyl butyral resin, agstone, phenolic resins and the ethanol mix and blend accounting for total ethanol consumption 18 ~ 50%, mixing time is 2 hours, obtains coating additive, stand-by;
4th step, mixes the coating additive of the refractory powder of first step gained and the 3rd step gained, then is added by residue ethanol, 2 ~ 3 hours mixed grind time, obtain resin bonded sand mould penetration-prevention alcohol-base foundry coating.
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| EP3870379A4 (en) * | 2018-10-24 | 2022-08-03 | Cukurova Kimya Endustrisi A.S. | A coating for casting moulds and cores and a production method for the coating |
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