CN108380815A - Lost foam casting hardens ghost coating and preparation method thereof - Google Patents

Lost foam casting hardens ghost coating and preparation method thereof Download PDF

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CN108380815A
CN108380815A CN201810510387.3A CN201810510387A CN108380815A CN 108380815 A CN108380815 A CN 108380815A CN 201810510387 A CN201810510387 A CN 201810510387A CN 108380815 A CN108380815 A CN 108380815A
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coating
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powder
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mass fraction
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CN108380815B (en
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顾其荣
顾鑫旺
姚萍
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JINGJIANG CITY LIMING CASTING MATERIAL FACTORY
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JINGJIANG CITY LIMING CASTING MATERIAL FACTORY
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C3/00Selection of compositions for coating the surfaces of moulds, cores, or patterns

Abstract

Lost foam casting hardens ghost coating and preparation method thereof, belongs to cast paint technical field.It is characterized in that using 50 55% silica flour of mass fraction, 10 12% mica powder, 5 6% fine perlite powder and 30 33% fused mullite powder as refractory aggregate, and other additives are added, dry-mixed in simpson mill and wet mixing raw material one after another, obtain paste coating, then paste coating is put into blender, and obtain liquid coating after water stirring is added,, way hanging property good, good permeability good with suspension, and the features such as room temperature and high elevated temperature strength, the quality of evaporative pattern production casting can be significantly improved.

Description

Lost foam casting hardens ghost coating and preparation method thereof
Technical field
The invention discloses a kind of lost foam casting coating and preparation method thereof, more particularly to a kind of lost foam casting hardening Ghost coating and preparation method thereof belongs to cast paint technical field.
Background technology
Lost foam casting, also known as cavityless casting are that bubbles model similar with casting dimension shape bonding is combined into mould Type cluster is embedded in vibration molding in dry sand, pours into a mould under negative pressure, model is made to gasify after brushing fireproof coating and drying, liquid metals Modal position is occupied, forms the casting method of casting after solidification is cooling, with sand removal is convenient, moulding sand may be reused, labor The features such as fatigue resistance is low and production efficiency is high, is applied widely in Foundry Production.Coating is coated on eps foam model table Face, it is desirable that it easily the characteristics such as falls off from casting table with high intensity, highly-breathable.Binder plays important in coating Effect, inorganic binder can be maintained at the intensity under room temperature and the condition of high temperature, and organic binder can improve under normal temperature state The strength and stiffness of coating, to prevent the apperance when back-up sand is vibrated to be destroyed and deform, to ensure the surface quality of casting, and It is become estranged decomposition by burning under high temperature casting condition, the hot permeability of coating can be effectively improved.Coating is lost foam casting life Important consumable material in production, the height of quality have very important influence to casting quality.
In order to improve lost foam casting coating performance, Chinese invention patent CN107497992 discloses a kind of disappearance molding Coating and preparation method thereof and application method are made, the lost foam casting coating is in terms of parts by weight including following components:Fire resisting 68~78 parts of aggregate, 2~6 parts of hydroxyethyl cellulose, 3~6 parts of sodium base bentonite, 4~7 parts of syrup, 2~6 parts of white glue with vinyl and squama 2~5 parts of piece graphite powder.The various raw materials of the lost foam casting coating are reasonably matched in parts by weight, have intensity high The good feature with fissility.Chinese invention patent CN107214294 also discloses a kind of lost foam casting coating, specifically A kind of high intensity high-adhesiveness lost foam casting coating:Ingredient by weight:30-40 parts of bauxite, 30-40 parts of zircon sand powder, stone 20-30 parts of English powder, 1-3 parts of Lithium base bentonites, 2-4.5 parts of polyvinyl butyral, 1-2 parts of acrylate, phenolic resin 1-3 parts, 1-5 parts of Ludox, 1-3 parts of sodium bentonite, 0.1-0.5 parts of isopropanol, CMC:0.5-2 parts, JFC:0.1-0.5 parts; It prepares:By the 1 ︰ 0.6-0.8 of proportioning for applying feed powder and water, it is put into blender, stirring measures Baume degrees after 1-1.5 hours, by adding Water adjusts Baume degrees in 65-70, continues stirring 15-25 minutes, releases and uses;The invention has excellent performance:It is good Suspension, thixotropy, gas permeability, higher surface strength and high-adhesiveness, it is environmentally protective at low cost.Chinese invention patent CN106825389 also discloses a kind of lost foam casting coating, by weight, including following component:50-60 parts of silica flour, 1-2 parts of plant gum powder, 10-15 parts of kaolin, 6-8 parts of bentonite, 4-6 parts of methyl methacrylate, 1-2 parts of polychloroprene latex and 0.2-0.4 parts of catalyst.The lost foam casting coating of the structure has adhesive force, being coated with property and levelability preferable excellent Point.Chinese invention patent CN106694798 also discloses a kind of powdery lost foam casting coating and its application method, powder-type coating Middle each component is as follows by weight percentage:Refractory aggregate 88.9~89.7%, sodium bentonite 3.7~4.5%, polyvinyl alcohol 0.78~1.23%, aluminium dihydrogen phosphate 0.82~1.85%, sodium carboxymethylcellulose 0.32~0.44%, expanded graphite 3.8~ 4.8%.When preparation, above-mentioned all powders are added to blender is dry-mixed to uniform to get product powdery lost foam casting coating.Make Used time is first added the water for accounting for powder-type coating weight percent 23.5~37% in blender, starts blender, by powder-type coating It is slowly added into blender, stirring is further continued for 1~2 hour after adding material, you can be used for the coating of evaporative pattern.In the invention raw material Formaldehyde need not be added and can reach the effect saved and not degenerate for a long time, be not necessarily to add surfactant in raw material, avoid The trouble that addition antifoaming agent is defoamed when follow-up use, finished product all have very high intensity, coating ventilative in room temperature or high temperature Property is good, will not discharge noxious material.Chinese invention patent CN105983646 also discloses a kind of lost foam casting coating, special Sign is that it includes 40-50 parts of bauxite, 20-30 parts of zirconium English powder, 15-20 parts of kaolin, schmigel 10- to calculate according to the mass fraction 15 parts, granularity is 240-300 mesh, further includes 8-12 parts of bentonite, 7-10 parts of waterglass, 4-5 parts of Ludox, polyvinyl acetate breast 2-3 parts of liquid, 1-2 parts of aluminum sulfate.The coating raw material derives from a wealth of sources, and production cost is low, and heat resistance is good, and cast(ing) surface is smooth, nothing Cold shut, not scab.Chinese invention patent CN105458160 also discloses a kind of preparation method of lost foam casting coating, including Common coating, CMC, white glue with vinyl, silica flour, lithium bentonite, activating agent and water, its step are as follows:S1:Common coating is added suitable Amount water is placed in paint can stirs 40-90min with blender;S2:The coating proportion is measured with Baume Hydrometer;S3:CMC is shifted to an earlier date It impregnates within 24 hours;S4:White glue with vinyl and soaked CMC and suitable quantity of water are poured into paint can, stirred with homogenizer equal It is even;S5:Silica flour is slowly added into paint can, is stirred evenly with homogenizer;S6:Paint can is added in lithium bentonite It is interior, stir 40-60min with homogenizer;The invention simplifies production craft step relative to other coating, effectively improves painting The intensity of material, it is easy to fall off in molten steel pouring course and form pigment finish leather to reduce the dope layer due to bubbles model, causes to cast The defects of part bark pocket, slag inclusion, scab.Chinese invention patent CN104226893 also disclose a kind of lost foam casting coating and its Preparation method.Coating is by mica powder, silica flour, Ludox, water, vegetable oil, alum, calcium carbonate, n-butanol, rosin and alkylbenzene Sulfonic acid is made;The mica powder, silica flour and calcium carbonate cross 300 mesh sieve.Preparation method for coating is:Rosin is placed in n-butanol In, it is slowly heated to 40-50 DEG C, after rosin is completely dissolved, is added after calcium carbonate is sufficiently stirred and obtains solution A, by mica powder Obtain suspension B after being sufficiently mixed with silica flour and Ludox, obtain solution C by alkyl benzene sulphonate is soluble in water, by solution A and After suspension B is sufficiently mixed, solution C is added, is eventually adding alum and carries out being mixed to get lost foam casting coating.The invention disappears Lost pattern casting coating raw material derives from a wealth of sources, and production cost is low, and preparation method is simple, and obtained cast(ing) surface is smooth, not scab.In State patent of invention CN103286259 also discloses a kind of cristobalite lost foam casting coating, it by cristobalite, graphite, bentonite, Organic binder and additive are process, it is characterised in that component weighs cristobalite 10-90, graphite 5-90, swelling by weight Native 1.5-3.0, organic binder 2.0-4.0, additive 1.0-2.0 are added water, and are mixed into starchiness, Baume degrees is in 22- 33Be ', you can.The advantages of invention, is:Good permeability, suspension is good, small, the casting table of volume expansion variation after coating cast The performance that the bright and clean coating in face can shell automatically, it is cost-effective, it is simple for process, improve the yield rate of casting.
When common lost foam casting production casting, there are bubbles model liquefaction incomplete combustions, and cast-internal is caused easily to go out Easily there is slag inclusion, seriously affect the inherent quality of casting and the presentation quality on surface in existing stomata, cast(ing) surface.It disappears to overcome This defect existing for die cast, researcher pour technology after successfully developing the first burning of lost foam casting.Chinese invention patent CN105598369 discloses a kind of method of evaporative pattern production ceramic particle enhancing bimetallic base tup, produces preparation flow Including:It makes tup apperance, placing ceramic prefabricated section, coat, bonding tup apperance, upside down directional solidification, vacuum in case Negative pressure is first burnt to be poured, vibrating casting forming, reprocesses finished product to tup afterwards.The tup of this method production is without die joint, external form It is regular, reduce due to waste product caused by mould shift, swell;Tup dimensional accuracy is high, reduces polishing amount, and it is strong both to have reduced labour Degree, and reduce the loss of metal;And tup wearability is good, service life is long, more has practicability.Chinese invention patent CN105598367 also discloses a kind of method producing Double-metal composite hammer upside down with evaporative pattern negative pressure of vacuum, production Preparation flow includes:Tup system apperance is made, coats, evaporative pattern solid more than one piece group mould is made in case, orienting coagulate upside down Gu, negative pressure of vacuum first burn pour afterwards, vibrating casting forming, to tup reprocess finished product.The invention solves existing tup life Production. art efficiency is low, sand recycles the problem of difficult, tup working face cannot achieve directional solidification.Chinese invention patent CN105598419 also discloses a kind of combination casting technique of evaporative pattern production tup, and production preparation flow includes:Make hammer Head system apperance, coat, make in case evaporative pattern solid more than one piece group mould, upside down directional solidification, negative pressure of vacuum first burn pour afterwards, Vibrating casting forming reprocesses finished product to tup spray.The invention is gone here and there together more using the multiple combinations of evaporative pattern Part string pours, using negative pressure of vacuum, first burn pour afterwards, the method for vibrating casting, make the tup smooth in appearance produced, without parting Face, and there is higher wearability and security reliability.But the various lost foam casting coatings that developed at present, generally It is low that there are intensity, cannot achieve the safety cast for the hardening ghost that lost foam casting is first burnt during pouring afterwards.
Invention content
The purpose of the present invention by change coating composition and preparation method thereof, realize paint heating after intensity significantly It improves, it is ensured that pouring technique after first burning may be used in lost foam casting, hardening ghost cast is realized, to increase substantially casting matter Amount.Lost foam casting hardening ghost coating of the present invention and preparation method thereof can be realized by following processing step:
1. using the silica flour of mass fraction 50-55%, the mica powder of 10-12%, 5-6% fine perlite powder and The fused mullite powder of 30-33% is as refractory aggregate, and 120-160 mesh accounts for 40%, 180-220 mesh and accounts for wherein in silica flour 35%, 230-270 mesh account for 20%, 280-320 mesh and account for 5%;160-220 mesh accounts for 70%, 240-280 mesh and accounts for 30% in mica powder; 160-220 mesh accounts for 45%, 240-280 mesh and accounts for 55% in fine perlite powder;120-160 mesh accounts for 35% in fused mullite powder, 180-220 mesh, which accounts for 45%, 230-270 mesh and accounts for 12%, 280-320 mesh, accounts for 8%;First by the silica flour of mass fraction 50-55%, The fused mullite powder of the mica powder of 10-12%, the fine perlite powder of 5-6% and 30-33% is done in simpson mill It is 25-30 minutes mixed, then sequentially add the anhydrous magnesium chloride powder of 200-260 mesh, the sulfuric acid aluminium powder of 200-260 mesh and 200-260 The graphite powder of purpose magnesia powder, 380-420 mesh, anhydrous magnesium chloride powder, sulfuric acid aluminium powder, magnesia powder, graphite powder addition point 1.5-2.0%, 2.8-3.0%, 4.5-4.8%, 1.0-1.2% of refractory aggregate total mass fraction are not accounted for, are continued in muller formula It is 12-15 minutes dry-mixed in sand mixer;
2. step 1. on the basis of, then into simpson mill be added Polyvinyl acetate adhesive, carboxymethyl cellulose Sodium, the polymer of vinyl acetate, chromium phosphate, sodium bentonite, n-butanol, positive the eleventh of the twelve Earthly Branches alcohol, formaldehyde, lithium bentonite, concave convex rod Stone clay, Tween-80, potassium permanganate, ice crystal, sodium metasilicate, starch, fatty alcohol polyoxyethylene ether AEO-03 and water, wherein poly- Vinyl acetate adhesive, sodium carboxymethylcellulose, the polymer of vinyl acetate, chromium phosphate, sodium bentonite, n-butanol, just The 0.8-1.0%, 1.2-1.5%, 1.0-1.2% of refractory aggregate the total mass fraction 1. addition of the eleventh of the twelve Earthly Branches alcohol accounts for step respectively in, 0.5-0.6%, 2.0-2.2%, 0.20-0.25%, 0.30-0.35%;Formaldehyde, Concave-convex clay rod, is spat lithium bentonite Temperature -80, potassium permanganate, ice crystal, sodium metasilicate, starch, fatty alcohol polyoxyethylene ether AEO-03, water addition account for step respectively 1. 0.30-0.35%, 0.8-1.0% of middle refractory aggregate total mass fraction, 1.0-1.2%, 0.5-0.6%, 0.3-0.4%, 0.4-0.5%, 0.3-0.4%, 0.4-0.5%, 0.6-0.7%, 8-10%;Then proceed to the wet mixing in simpson mill 18-20 minutes, it was in paste to make gained coating, obtains paste coating;
3. by step 2. in paste coating, be put into blender, and water is added, the pH value of water is controlled in 6.2-6.8, water Addition account for the 30-35% of paste coating mass fraction, Agitator Impeller tip circular velocity is 320-350m/min, stirring After 30-35 minutes, you can obtain lost foam casting and harden ghost liquid coating.
Lost foam casting coating and general cast paint are generally suitable, are made of the different material of a variety of properties, Generally include the compositions such as refractory aggregate, carrier, binder, suspending agent and other additives.Refractory aggregate is lost foam paint Main body, its mass fraction is usual in lost foam paint>50%.The present invention using mass fraction 50-55% silica flour, The fused mullite powder of the mica powder of 10-12%, the fine perlite powder of 5-6% and 30-33% is as refractory aggregate.The present invention Refractory aggregate, in order to ensure the gas permeability and intensity of coating, there is strictly the granularity of refractory aggregate based on cheap silica flour It is required that when in silica flour 120-160 mesh account for 40%, 180-220 mesh and account for 35%, 230-270 mesh and account for 20%, 280-320 mesh and account for 5%;160-220 mesh accounts for 70%, 240-280 mesh and accounts for 30% in mica powder;160-220 mesh accounts for 45% in fine perlite powder, 240-280 mesh accounts for 55%;120-160 mesh, which accounts for 35%, 180-220 mesh and accounts for 45%, 230-270 mesh, in fused mullite powder accounts for When 12%, 280-320 mesh account for 8%, the coating finally obtained has good gas permeability in use, and has high room Warm intensity and excellent elevated temperature strength.After the fine perlite powder of 5-6% is added in refractory aggregate, coating gas permeability can be improved And its stability is kept, so that surface of the coating after high temperature sintering is become very bright and clean, it is ensured that molten metal in casting process Poring rate greatly improves, so as to improve the presentation quality and production efficiency of casting.The lamellar of mass fraction 30% Mica assigns the good suspension of coating, levelability, has good toughness after coating drying, can prevent coating from cracking.It burns It is higher to tie mullite flame-proof degree, up to 1790 DEG C or more, thermal shock resistance is good, in order to ensure the elevated temperature strength of coating, the present invention The fused mullite powder of mass fraction 30-30% is added in refractory aggregate.
Water and ethyl alcohol generally can be used in the carrier of cast paint, for lost foam casting coating, consider apply, drying, The reason of gas forming amount, price etc., the present invention is using water as carrier, as water based paint.At the same time, water based paint is outstanding Buoyancy, thixotropy are good, can easily be accommodated.In addition, the anhydrous chlorine of 1.5-2.0% for accounting for refractory aggregate total mass fraction is added in the present invention Change magnesium powder, be conducive to inorganic mineral refractory ceramics, realizes that lost foam casting first burns the ceramic of dope layer when pouring afterwards in the process, from And dope layer elevated temperature strength can be improved, the anti-stick grittiness of dope layer can also be improved.It is especially added and accounts for the total matter of refractory aggregate After the magnesia powder for measuring score 4.5-4.8%, it can be conducive to dope layer intensity under high temperature together with anhydrous magnesium chloride powder It further increases.After addition accounts for the sulfuric acid aluminium powder of refractory aggregate total mass fraction 2.8-3.0%, sintering temperature can be reduced, into One step promotes the ceramic under coating high temperature, improves dope layer elevated temperature strength.Addition accounts for refractory aggregate total mass fraction 1.0- 1.2% graphite powder can improve the gas permeability of dope layer.In order to make each constituent in coating be uniformly mixed, coating is made to have Excellent comprehensive performance, the present invention first by the silica flour of mass fraction 50-55%, the mica powder of 10-12%, 5-6% it is puffing The fused mullite powder of crushed crude pearlite and 30-33% are 25-30 minutes dry-mixed in simpson mill, then sequentially add 200- The graphite of the anhydrous magnesium chloride powder of 260 mesh, the magnesia powder of the sulfuric acid aluminium powder of 200-260 mesh and 200-260 mesh, 380-420 mesh Powder, anhydrous magnesium chloride powder, sulfuric acid aluminium powder, magnesia powder, graphite powder addition account for the 1.5- of refractory aggregate total mass fraction respectively 2.0%, 2.8-3.0%, 4.5-4.8%, 1.0-1.2% continue 12-15 minutes dry-mixed in simpson mill.
Binder in lost foam casting coating is to the intensity of dope layer and to improve it most important with the adhesive force of apperance. Coating intensity and being coated with property are not only assigned, suspension is improved, the adhesion for also having had dope layer does not react with apperance. The binder of common lost foam casting coating mainly has clay, waterglass, syrup, spent pulping liquor, milky white adhesive, Ludox etc..But It is that single to use sodium silicate binder, coating brittleness is big, easy to crack.It is single using clay, syrup, spent pulping liquor, milky white adhesive, The binders such as Ludox, coating intensity is low, needs to increase paint thickness during use, can increase considerably lost foam casting Production cost.The present invention accounts for Polyvinyl acetate adhesive, the 1.2- of refractory aggregate mass fraction 0.8-1.0% by being added The polymer of 1.5% sodium carboxymethylcellulose, the vinyl acetate of 1.0-1.2%, the wherein polymer of vinyl acetate Chinese nickname is the polymer of two-C8-18- alkyl esters and vinyl acetate of (E)-(E)-butenedioic acid, chemical formula C8H10O6, they Addition can ensure coating being coated with property and coating room temperature under have high intensity.On this basis, it is added and accounts for refractory aggregate matter The chromium phosphate of score 0.5-0.6%, the sodium bentonite of 2.0-2.2% are measured, to support sand mold and resist washing away for molten metal Effect.Organic binder and the common bearing strength of inorganic binder under room temperature, it is organic viscous when being poured after the first burning of lost foam casting Knot agent is burnt, and gas permeability is increased, and intensity at this time will rely on inorganic binder, and the present invention is by adjusting organic binder and nothing The addition of machine binder can make the hardening ghost of lost foam casting have high intensity and good gas permeability.
In addition, positive the eleventh of the twelve Earthly Branches alcohol of the n-butanol, 0.30-0.35% that account for refractory aggregate mass fraction 0.20-0.25% is added, it can To prevent surface blistering during coating use, make the dope layer any surface finish contacted with apperance.The mould that lost foam casting uses Sample is mostly foamed poly styrene plastic (EPS), or foaming polymethyl methacrylate (EPMMA), and surface is hydrophobic. To change this phenomenon, the fat of the Tween-80 and 0.6-0.7% that account for refractory aggregate mass fraction 0.5-0.6% is added in the present invention Fat alcohol polyoxyethylene ether AEO-03, wherein Tween-80 are a kind of nonionic surface active agent and emulsifier, by sorbitan and Oleic acid is made by ethoxylation, the addition of 0.5-0.6% Tween-80s, so that coating is soaked with apperance, to improve apperance and coating The bond strength of interlayer.And fatty alcohol polyoxyethylene ether AEO-03, also known as polyoxyethylene aliphatic alcohol ether, it is that non-ionic surface is lived With fastest developing speed, the maximum kind of dosage in property agent.Such surfactant is contracted by polyethylene glycol (PEG) and fatty alcohol Ether made of conjunction, is indicated with following general formula:RO (CH2CH2O) 3H, is at room temperature colourless transparent liquid, nontoxic, non-stimulated, is had Good emulsibility, is important nonionic surfactant, for that in coating of the present invention, can improve coating and the molding that disappears The bond strength between the apperance used is made, Paint Falling is prevented.Potassium permanganate is added in coating material of the present invention can both prevent because of gold Belong to liquid and chemical scab defect caused by chemical reaction occurs with coating, and the carburetting of the elephant skin of ironcasting, steel-casting can be reduced Defect.
In dope preparing process of the present invention, on the basis of refractory aggregate is dry-mixed, then poly-vinegar is added into simpson mill Sour adhesive ethylene, sodium carboxymethylcellulose, the polymer of vinyl acetate, chromium phosphate, sodium bentonite, n-butanol, positive the eleventh of the twelve Earthly Branches Alcohol, formaldehyde, lithium bentonite, Concave-convex clay rod, Tween-80, potassium permanganate, ice crystal, sodium metasilicate, starch, poly alkyl alcohol Ethylene oxide ether AEO-03 and water, wherein Polyvinyl acetate adhesive, sodium carboxymethylcellulose, the polymer of vinyl acetate, phosphorus Sour chromium, sodium bentonite, n-butanol, positive the eleventh of the twelve Earthly Branches alcohol addition account for 0.8-1.0%, 1.2- of refractory aggregate total mass fraction respectively 1.5%, 1.0-1.2%, 0.5-0.6%, 2.0-2.2%, 0.20-0.25%, 0.30-0.35%;Formaldehyde, lithium bentonite, Concave-convex clay rod, Tween-80, potassium permanganate, ice crystal, sodium metasilicate, starch, fatty alcohol polyoxyethylene ether AEO-03, water Addition accounts for 0.30-0.35%, 0.8-1.0%, 1.0-1.2%, 0.5-0.6%, 0.3- of refractory aggregate mass fraction respectively 0.4%, 0.4-0.5%, 0.3-0.4%, 0.4-0.5%, 0.6-0.7%, 8-10%;It then proceedes in simpson mill Wet mixing 18-20 minutes, it is in paste to make coating, obtains paste coating, and paste coating is put into blender, while water is added, The pH value of water is controlled in 6.2-6.8, and the addition of water accounts for the 30-35% of paste coating mass fraction, Agitator Impeller tip week Speed control is in 320-350m/min, after stirring 30-35 minutes, you can obtains lost foam casting and hardens ghost liquid coating.
Coating of the present invention has the following advantages compared with existing lost foam casting coating:
1) coating property of the present invention is stablized, and suspension is good, and suspension degree is up to 99% or more.
2) dope layer of the present invention can occur rapidly ceramic and turn under molten metal effect of the pouring temperature more than 1300 DEG C Become, the intensity of dope layer increases substantially instead with the raising and the extension of the duration of pouring of molten metal pouring temperature, resistance to gold The performance of flushing for belonging to melt is good, without dust pollution, and coating good toughness, will not occur under the continuous erosion effect of molten metal It cracks and flakes off, Fig. 1 is the surface appearance figure of coating after pouring into a mould 1420 DEG C of cast steels.
3) coating of the present invention intensity after 63-66 DEG C of heating, drying 3-4 hours increases substantially, it is ensured that lost foam casting Pouring technique after the first burning of evaporative pattern apperance may be used, hardening ghost cast is realized, to increase substantially casting quality.
4) elevated temperature strength of coating of the present invention is good, easy-sintering, with the conventional coating phase that thickness of coating layer is 0.4-0.6mm High-temperature bending strength than, the coating is more than 120MPa, far above conventional coating, and can be sintered blocking under high temperature, prevent from gluing Sand, after casting mould turnover, coating is easily peelable.
5) coating of the present invention is nontoxic, tasteless, environmentally protective, and raw material sources are convenient, and coating manufacturing cost is cheap, promotes and applies With good economic and social benefit.
Description of the drawings
Fig. 1 is the surface appearance figure that embodiment 1 pours into a mould coating after 1420 DEG C of cast steels
Specific implementation mode
The present invention is further described with reference to embodiments, but the present invention is not limited to following embodiments.
Embodiment 1:
Lost foam casting hardens ghost coating and preparation method thereof, it is characterized in that dry-mixed in simpson mill one after another With wet mixing raw material, paste coating is obtained, then paste coating is put into blender, and liquid painting is obtained after water stirring is added Material, specific step of preparation process are as follows:
1. using the silica flour of mass fraction 50%, 12% mica powder, 5% fine perlite powder and 33% sintering As refractory aggregate, wherein in silica flour, 120-160 mesh accounts for 40%, 180-220 mesh and accounts for 35%, 230-270 mesh mullite powder accounts for 20%, 280-320 mesh account for 5%;160-220 mesh accounts for 70%, 240-280 mesh and accounts for 30% in mica powder;In fine perlite powder 160-220 mesh accounts for 45%, 240-280 mesh and accounts for 55%;120-160 mesh accounts for 35%, 180-220 mesh and accounts in fused mullite powder 45%, 230-270 mesh account for 12%, 280-320 mesh and account for 8%;First by the silica flour of mass fraction 50%, 12% mica powder, 5% Fine perlite powder and 33% fused mullite powder dry-mixed 25 minutes in simpson mill, then sequentially add 200- The graphite of the anhydrous magnesium chloride powder of 260 mesh, the magnesia powder of the sulfuric acid aluminium powder of 200-260 mesh and 200-260 mesh, 380-420 mesh Powder, anhydrous magnesium chloride powder, sulfuric acid aluminium powder, magnesia powder, graphite powder addition account for refractory aggregate total mass fraction respectively 1.5%, 3.0%, 4.5%, 1.2%, continue dry-mixed 15 minutes in simpson mill;
2. step 1. on the basis of, then into simpson mill be added Polyvinyl acetate adhesive, carboxymethyl cellulose Sodium, the polymer of vinyl acetate, chromium phosphate, sodium bentonite, n-butanol, positive the eleventh of the twelve Earthly Branches alcohol, formaldehyde, lithium bentonite, concave convex rod Stone clay, Tween-80, potassium permanganate, ice crystal, sodium metasilicate, starch, fatty alcohol polyoxyethylene ether AEO-03 and water, wherein poly- Vinyl acetate adhesive, sodium carboxymethylcellulose, the polymer of vinyl acetate, chromium phosphate, sodium bentonite, n-butanol, just 1. the addition of the eleventh of the twelve Earthly Branches alcohol accounts for step respectively in refractory aggregate total mass fraction 0.8%, 1.5%, 1.0%, 0.6%, 2.0%, 0.25%, 0.30%;Formaldehyde, lithium bentonite, Concave-convex clay rod, Tween-80, potassium permanganate, ice crystal, sodium metasilicate, shallow lake Powder, fatty alcohol polyoxyethylene ether AEO-03, water addition account for step respectively 1. in refractory aggregate total mass fraction 0.30%, 1.0%, 1.0%, 0.6%, 0.3%, 0.5%, 0.3%, 0.5%, 0.6%, 10%;It then proceedes in simpson mill Wet mixing 18 minutes, it is in paste to make coating, obtains paste coating;
3. by step 2. in paste coating, be put into blender, and water is added, the control of the pH value of water 6.2, water plus Enter amount accounts for paste coating mass fraction 30%, Agitator Impeller tip circular velocity is 320m/min, after stirring 35 minutes, you can It obtains lost foam casting and hardens ghost liquid coating, coating property is shown in Table 1.
Embodiment 2:
Lost foam casting hardens ghost coating and preparation method thereof, it is characterized in that dry-mixed in simpson mill one after another With wet mixing raw material, paste coating is obtained, then paste coating is put into blender, and liquid painting is obtained after water stirring is added Material, specific step of preparation process are as follows:
1. using the silica flour of mass fraction 55%, 10% mica powder, 5% fine perlite powder and 30% sintering As refractory aggregate, wherein in silica flour, 120-160 mesh accounts for 40%, 180-220 mesh and accounts for 35%, 230-270 mesh mullite powder accounts for 20%, 280-320 mesh account for 5%;160-220 mesh accounts for 70%, 240-280 mesh and accounts for 30% in mica powder;In fine perlite powder 160-220 mesh accounts for 45%, 240-280 mesh and accounts for 55%;120-160 mesh accounts for 35%, 180-220 mesh and accounts in fused mullite powder 45%, 230-270 mesh account for 12%, 280-320 mesh and account for 8%;First by the silica flour of mass fraction 55%, 10% mica powder, 5% Fine perlite powder and 30% fused mullite powder dry-mixed 30 minutes in simpson mill, then sequentially add 200- The graphite of the anhydrous magnesium chloride powder of 260 mesh, the magnesia powder of the sulfuric acid aluminium powder of 200-260 mesh and 200-260 mesh, 380-420 mesh Powder, anhydrous magnesium chloride powder, sulfuric acid aluminium powder, magnesia powder, graphite powder addition account for refractory aggregate total mass fraction respectively 2.0%, 2.8%, 4.8%, 1.0%, continue dry-mixed 12 minutes in simpson mill;
2. step 1. on the basis of, then into simpson mill be added Polyvinyl acetate adhesive, carboxymethyl cellulose Sodium, the polymer of vinyl acetate, chromium phosphate, sodium bentonite, n-butanol, positive the eleventh of the twelve Earthly Branches alcohol, formaldehyde, lithium bentonite, concave convex rod Stone clay, Tween-80, potassium permanganate, ice crystal, sodium metasilicate, starch, fatty alcohol polyoxyethylene ether AEO-03 and water, wherein poly- Vinyl acetate adhesive, sodium carboxymethylcellulose, the polymer of vinyl acetate, chromium phosphate, sodium bentonite, n-butanol, just 1. the addition of the eleventh of the twelve Earthly Branches alcohol accounts for step respectively in refractory aggregate total mass fraction 1.0%, 1.2%, 1.2%, 0.5%, 2.2%, 0.20%, 0.35%;Formaldehyde, lithium bentonite, Concave-convex clay rod, Tween-80, potassium permanganate, ice crystal, sodium metasilicate, shallow lake Powder, fatty alcohol polyoxyethylene ether AEO-03, water addition account for step respectively 1. in refractory aggregate total mass fraction 0.35%, 0.8%, 1.2%, 0.5%, 0.4%, 0.4%, 0.4%, 0.4%, 0.7%, 8%;It then proceedes in simpson mill Wet mixing 20 minutes, it is in paste to make coating, obtains paste coating;
3. by step 2. in paste coating, be put into blender, and water is added, the control of the pH value of water 6.8, water plus Enter amount accounts for paste coating mass fraction 35%, Agitator Impeller tip circular velocity is 350m/min, after stirring 30 minutes, you can It obtains lost foam casting and hardens ghost liquid coating, coating property is shown in Table 1.
Embodiment 3:
Lost foam casting hardens ghost coating and preparation method thereof, it is characterized in that dry-mixed in simpson mill one after another With wet mixing raw material, paste coating is obtained, then paste coating is put into blender, and liquid painting is obtained after water stirring is added Material, specific step of preparation process are as follows:
1. using the silica flour of mass fraction 51%, 11% mica powder, 6% fine perlite powder and 32% sintering As refractory aggregate, wherein in silica flour, 120-160 mesh accounts for 40%, 180-220 mesh and accounts for 35%, 230-270 mesh mullite powder accounts for 20%, 280-320 mesh account for 5%;160-220 mesh accounts for 70%, 240-280 mesh and accounts for 30% in mica powder;In fine perlite powder 160-220 mesh accounts for 45%, 240-280 mesh and accounts for 55%;120-160 mesh accounts for 35%, 180-220 mesh and accounts in fused mullite powder 45%, 230-270 mesh account for 12%, 280-320 mesh and account for 8%;First by the silica flour of mass fraction 51%, 11% mica powder, 6% Fine perlite powder and 32% fused mullite powder dry-mixed 28 minutes in simpson mill, then sequentially add 200- The graphite of the anhydrous magnesium chloride powder of 260 mesh, the magnesia powder of the sulfuric acid aluminium powder of 200-260 mesh and 200-260 mesh, 380-420 mesh Powder, anhydrous magnesium chloride powder, sulfuric acid aluminium powder, magnesia powder, graphite powder addition account for refractory aggregate total mass fraction respectively 1.8%, 2.9%, 4.6%, 1.1%, continue dry-mixed 14 minutes in simpson mill;
2. step 1. on the basis of, then into simpson mill be added Polyvinyl acetate adhesive, carboxymethyl cellulose Sodium, the polymer of vinyl acetate, chromium phosphate, sodium bentonite, n-butanol, positive the eleventh of the twelve Earthly Branches alcohol, formaldehyde, lithium bentonite, concave convex rod Stone clay, Tween-80, potassium permanganate, ice crystal, sodium metasilicate, starch, fatty alcohol polyoxyethylene ether AEO-03 and water, wherein poly- Vinyl acetate adhesive, sodium carboxymethylcellulose, the polymer of vinyl acetate, chromium phosphate, sodium bentonite, n-butanol, just 1. the addition of the eleventh of the twelve Earthly Branches alcohol accounts for step respectively in refractory aggregate total mass fraction 0.9%, 1.4%, 1.1%, 0.55%, 2.1%, 0.22%, 0.32%;Formaldehyde, lithium bentonite, Concave-convex clay rod, Tween-80, potassium permanganate, ice crystal, sodium metasilicate, shallow lake Powder, fatty alcohol polyoxyethylene ether AEO-03, water addition account for step respectively 1. in refractory aggregate total mass fraction 0.32%, 0.9%, 1.1%, 0.55%, 0.35%, 0.45%, 0.35%, 0.45%, 0.65%, 9%;It then proceedes to mixed in muller formula Wet mixing 19 minutes in sand machine, it is in paste to make coating, obtains paste coating;
3. by step 2. in paste coating, be put into blender, and water is added, the control of the pH value of water 6.6, water plus Enter amount accounts for paste coating mass fraction 32%, Agitator Impeller tip circular velocity is 340m/min, after stirring 33 minutes, you can It obtains lost foam casting and hardens ghost liquid coating, coating property is shown in Table 1.
1 coating property of table
Coating property of the present invention is stablized, and suspension is good, and suspension degree is up to 99% or more.The flow cup viscosity of coating of the present invention is suitable In, flow cup viscosity is excessive to easily lead to that coating application is bad or dope layer cracking, and flow cup viscosity is smaller to cause being coated with property of coating poor, Being coated with property of coating of the present invention is good, does not crack after being coated with drying.Dope layer of the present invention is molten in metal of the pouring temperature more than 1300 DEG C Under liquid effect, ceramic transformation can be occurred rapidly, the intensity of dope layer with molten metal pouring temperature raising and cast when Between extension increase substantially instead, the performance of flushing of resistance to molten metal is good, without dust pollution, and coating good toughness, in metal The continuous erosion effect of melt is lower to be cracked and flaked off, coating of the present invention after 63-66 DEG C of heating, drying 3-4 hours by force Degree increases substantially, and bending strength reaches 40MPa or more, it is ensured that evaporative pattern mould may be used in lost foam casting production process Pouring technique after the first burning of sample realizes hardening ghost cast, to increase substantially casting quality.The elevated temperature strength of coating of the present invention Good, easy-sintering, compared with thickness of coating layer is the conventional coating of 0.4-0.6mm, the high-temperature bending strength of the coating is more than 120MPa far above conventional coating, and can be sintered blocking, prevent scab, after casting mould turnover, coating is easily peelable under high temperature.This Invention coating is nontoxic, tasteless, environmentally protective, and raw material sources are convenient, and coating manufacturing cost is cheap, and promoting and applying has good warp Ji and social benefit.

Claims (3)

1. a kind of preparation method of lost foam casting hardening ghost coating, which is characterized in that include the following steps:
1. using the silica flour of mass fraction 50-55%, the fine perlite powder and 30- of the mica powder of 10-12%, 5-6% 33% fused mullite powder is as refractory aggregate, and 120-160 mesh accounts for 40%, 180-220 mesh and accounts for 35% wherein in silica flour, 230-270 mesh accounts for 20%, 280-320 mesh and accounts for 5%;160-220 mesh accounts for 70%, 240-280 mesh and accounts for 30% in mica powder;Puffing treasure 160-220 mesh accounts for 45%, 240-280 mesh and accounts for 55% in pearl rock powder;120-160 mesh accounts for 35%, 180-220 in fused mullite powder Mesh, which accounts for 45%, 230-270 mesh and accounts for 12%, 280-320 mesh, accounts for 8%;First by the silica flour of mass fraction 50-55%, 10-12% The fused mullite powder of mica powder, the fine perlite powder of 5-6% and 30-33% is dry-mixed 25-30 points in simpson mill Then clock sequentially adds the magnesia of the anhydrous magnesium chloride powder of 200-260 mesh, the sulfuric acid aluminium powder and 200-260 mesh of 200-260 mesh The graphite powder of powder, 380-420 mesh, anhydrous magnesium chloride powder, sulfuric acid aluminium powder, magnesia powder, graphite powder addition account for fire resisting bone respectively Expect 1.5-2.0%, 2.8-3.0%, 4.5-4.8%, 1.0-1.2% of total mass fraction, continues to do in simpson mill It is 12-15 minutes mixed;
2. step 1. on the basis of, then into simpson mill be added Polyvinyl acetate adhesive, sodium carboxymethylcellulose, second Polymer, chromium phosphate, sodium bentonite, n-butanol, positive the eleventh of the twelve Earthly Branches alcohol, formaldehyde, lithium bentonite, the attapulgite of vinyl acetate are viscous Soil, Tween-80, potassium permanganate, ice crystal, sodium metasilicate, starch, fatty alcohol polyoxyethylene ether AEO-03 and water, wherein poly-vinegar acid Adhesive ethylene, sodium carboxymethylcellulose, the polymer of vinyl acetate, chromium phosphate, sodium bentonite, n-butanol, positive the eleventh of the twelve Earthly Branches alcohol Addition account for step respectively 1. in refractory aggregate total mass fraction 0.8-1.0%, 1.2-1.5%, 1.0-1.2%, 0.5- 0.6%, 2.0-2.2%, 0.20-0.25%, 0.30-0.35%;Formaldehyde, lithium bentonite, Concave-convex clay rod, Tween-80, Potassium permanganate, ice crystal, sodium metasilicate, starch, fatty alcohol polyoxyethylene ether AEO-03, water addition account for step respectively 1. in it is resistance to 0.30-0.35%, 0.8-1.0%, 1.0-1.2%, 0.5-0.6%, 0.3-0.4%, 0.4- of fiery aggregate total mass fraction 0.5%, 0.3-0.4%, 0.4-0.5%, 0.6-0.7%, 8-10%;Then proceed to the wet mixing 18-20 in simpson mill Minute, it is in paste to make gained coating, obtains paste coating;
3. by step 2. in paste coating, be put into blender, and water is added, the control of the pH value of water in 6.2-6.8, water plus Enter the 30-35% that amount accounts for paste coating mass fraction, Agitator Impeller tip circular velocity is 320-350m/min, stirs 30-35 After minute, you can obtain lost foam casting and harden ghost liquid coating.
2. the lost foam casting hardening ghost coating being prepared according to the method for claim 1.
3. the application for the lost foam casting hardening ghost coating being prepared according to the method for claim 1, using first burning Pouring technique afterwards realizes hardening ghost cast.
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CN110421116A (en) * 2019-09-16 2019-11-08 安徽信息工程学院 A kind of as cast condition WCB cast steel evaporative pattern water base environmental protection coating material and preparation method thereof
CN111715844A (en) * 2020-07-02 2020-09-29 宁夏共享化工有限公司 Ceramic coating for casting process of evaporative pattern with hollow shell formed by sintering before pouring
CN111715844B (en) * 2020-07-02 2021-11-09 宁夏共享化工有限公司 Ceramic coating for casting process of evaporative pattern with hollow shell formed by sintering before pouring

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CN108788001A (en) * 2018-08-27 2018-11-13 河北冀凯铸业有限公司 A kind of large size alloy cast steel part evaporative pattern water based paint
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CN111715844B (en) * 2020-07-02 2021-11-09 宁夏共享化工有限公司 Ceramic coating for casting process of evaporative pattern with hollow shell formed by sintering before pouring

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