CN103056288A - Lost foam casting paint for chromium-containing cast iron and preparation method thereof - Google Patents

Lost foam casting paint for chromium-containing cast iron and preparation method thereof Download PDF

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Publication number
CN103056288A
CN103056288A CN2013100293987A CN201310029398A CN103056288A CN 103056288 A CN103056288 A CN 103056288A CN 2013100293987 A CN2013100293987 A CN 2013100293987A CN 201310029398 A CN201310029398 A CN 201310029398A CN 103056288 A CN103056288 A CN 103056288A
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solution
acetic acid
acid esters
6sio
oal
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CN103056288B (en
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陆万玉
杨加祥
夏治寨
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Ma'anshan Huada Metallurgical & Machinery Co Ltd
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Ma'anshan Huada Metallurgical & Machinery Co Ltd
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Abstract

The invention provides a lost foam casting paint for chromium-containing cast iron and a preparation method thereof. The paint comprises the following components in percentage by weight: 15-20% of nano K2O. Al2O3.6SiO2 composite powder, 8-12% of blast furnace slag powder, 0.15-0.2% of sodium dodecyl benzene sulfonate, 2-5% of sodium bentonite, 1-2.5% of silica sol, 5-8% of 3-methyl-2-butenyl-1-ol acetate composite solution and the balance of quartz powder. The blast furnace slag comprises the following components in percentage by weight: 36-40% of CaO, 13-15% of Al2O3, 6-9% of MgO, 0.6-0.9% S, 0.3-0.5% of FeO and the balance of SiO2. The particle size of the K2O.Al2O3.6SiO2 composite powder is 80-100 nm, the particle size of the sodium bentonite and blast furnace slag powder is 80-100 mu m, and the particle size of the quartz powder is 1-5 mm.

Description

A kind of chromium cast iron contained lost foam casting coating and preparation method thereof
 
Technical field
The invention belongs to casting field, relate to a kind of chromium cast iron contained lost foam casting coating and preparation method thereof.
Background technology
201110228516.8 number application discloses a kind of coating for lost foam casting cast iron and manufacture craft thereof, wherein proportioning is got silica flour, graphite powder (lead powder), crystalline graphite powder, lithium bentonite, phenolic resins, carboxymethyl cellulose, milky white adhesive, n-octyl alcohol in accordance with regulations, stirs the available coating of acquisition through adding regulation ratio hot water and the blanking of regulation order.
201210319941.2 number application relates to a kind of cast iron lost foam paint and preparation method thereof, coating comprises following component: bauxite chamotte 45-55 weight portion, quartz sand 20-30 weight portion, sodium bentonite 1-3 weight portion, CMC0.5-1.5 weight portion, polyvinyl alcohol (PVA) 0.5-1.5 weight portion, the T-80 of 0.1-0.3 weight portion, n-octyl alcohol 0.2-0.5 weight portion, ferric oxide red powder 0.5-1.5 weight portion.
The problem that above-mentioned coating exists is, suspension and intensity are also not enough, and contain harmful components in the coating composition, and n-octyl alcohol wherein has spread effect to eyes, skin, mucous membrane and the upper respiratory tract.
Summary of the invention
Purpose of the present invention is exactly for above-mentioned technological deficiency, and a kind of chromium cast iron contained lost foam casting coating is provided, and not only has good suspension and elevated temperature strength, and the raw material non-environmental-pollution.
Another object of the present invention provides a kind of chromium cast iron contained lost foam casting coating preparation method, and this preparation method's technique is simple, and production cost is low, is suitable for suitability for industrialized production.
Lost foam casting coating of the present invention is used for chromium cast iron contained.
The objective of the invention is to be achieved through the following technical solutions:
OnePlant the chromium cast iron contained lost foam casting coating, it is characterized in that: the percentage by weight of each composition is in this coating: nanoscale K 2OAl 2O 36SiO 2Composite granule 15-20%, blast-furnace slag powder 8-12%, neopelex 0.15-0.2%, sodium bentonite 2-5%, Ludox 1-2.5%, 3-M2BOL acetic acid esters composite solution 5-8%, all the other are silica flour;
Wherein the blast-furnace slag composition percentage by weight be CaO 36-40%, Al 2O 313-15%, MgO 6-9%, S 0.6-0.9%, FeO 0.3-0.5%, all the other are SiO 2
Nanoscale K 2OAl 2O 36SiO 2The particle diameter of composite granule is 80-100nm, and the particle diameter of sodium bentonite and blast-furnace slag powder is 80-100 μ m, and the particle diameter of silica flour is 1-5mm.
Described 3-M2BOL acetic acid esters composite solution is formulated by the following method: wherein raw materials used percentage by weight is: dioctyl phthalate 4-6%, n-butanol 1-2%, polyvinyl alcohol 4-8%, potassium peroxydisulfate 0.15-0.19%, 3-M2BOL acetic acid esters 45-50%, surplus is water; First dioctyl phthalate is mixed with n-butanol, stir and make its dissolving, it is stand-by to form the solution first; Add entry in container, be heated to 80 ℃, under agitation add polyvinyl alcohol, be warming up to 95 ℃, insulation is to all dissolvings; After dissolving, stopped heating makes temperature be down to 68~70 ℃, under agitation adds the 3-M2BOL acetic acid esters, and it is stand-by to form solution second; Solution first and solution second are mixed, add potassium peroxydisulfate, mix, be warmed up between 65~70 ℃, stopped 1 hour, obtain 3-M2BOL acetic acid esters composite solution.
The above-mentioned chromium cast iron contained preparation method of lost foam casting coating may further comprise the steps:
1) nanoscale K 2OAl 2O 36SiO 2Composite granule is prepared:
Preparation ZrOCl 2The aqueous solution, with ammoniacal liquor as precipitating reagent; Be that 50kHz, power are under the condition of 400W continuous stirring, with ZrOCl in supersonic frequency 2The aqueous solution is added drop-wise in the precipitating reagent with the speed of 2mL/min, and the pH value of control solution is 9; After dropwising, continue to stir 3h, then leave standstill aging 6h, obtain Zr (OH) 4Hydrosol A is stand-by;
With FeCl 36H 2O and FeCl 24H 2O mixes, and glucan T-40 is dissolved in the pure water under the environment of inflated with nitrogen, adds FeCl again 36H 2O and FeCl 24H 2The O mixture; Stir with constant temperature blender with magnetic force, drip simultaneously 30% ammoniacal liquor 1200ml, be warming up to 80 ℃, 1200r/min, reaction 1h obtains colloid B; FeCl wherein 36H 2O, FeCl 24H 2The weight ratio of O, glucan T-40 and pure water is 100:37:214:1500; The volume ratio 15:12 of pure water and ammoniacal liquor;
With hydrosol A, colloid B and K 2OAl 2O 36SiO 2Powder mixes for 0.6:1:0.8-1.1 in mass ratio; K 2OAl 2O 36SiO 2The particle diameter of powder is 60-80nm; Under supersonic frequency 50kHz power, 400W in 50-55 ℃ of ultrasonic agitation 0.5h; Then in 100 ℃ of lower constant pressure and dry 5h, namely obtain nanoscale K 2OAl 2O 36SiO 2Composite granule;
2) preparation of 3-M2BOL acetic acid esters composite solution: wherein raw materials used percentage by weight is: dioctyl phthalate 4-6%, n-butanol 1-2%, polyvinyl alcohol 4-8%, potassium peroxydisulfate 0.15-0.19%, 3-M2BOL acetic acid esters 45-50%, surplus is water; First dioctyl phthalate is mixed with n-butanol, stir and make its dissolving, it is stand-by to form the solution first; Add entry in container, be heated to 80 ℃, under agitation add polyvinyl alcohol, be warming up to 95 ℃, insulation is to all dissolvings; After dissolving, stopped heating makes temperature be down to 68~70 ℃, under agitation adds the 3-M2BOL acetic acid esters, and it is stand-by to form solution second; Solution first and solution second are mixed, add potassium peroxydisulfate, mix, be warmed up between 65~70 ℃, stopped 1 hour, obtain 3-M2BOL acetic acid esters composite solution, stand-by;
3) chromium cast iron contained prepares with lost foam casting coating: each composition is prepared as following weight percent: above-mentioned nanoscale K 2OAl 2O 36SiO 2Composite granule 15-20%, blast-furnace slag powder 8-12%, neopelex 0.15-0.2%, sodium bentonite 2-5%, Ludox 1-2.5%, 3-M2BOL acetic acid esters composite solution 5-8%, all the other are silica flour; Then each composition being put into container stirs and get final product.
Step 1) prepares Zr (OH) 4ZrOCl among the hydrosol A 2Dense the crossing of the aqueous solution is 0.2mol/L.
Step 1) prepares Zr (OH) 4Ammoniacal liquor as precipitating reagent among the hydrosol A adopts 2.5% ammoniacal liquor.
The present invention has following beneficial effect compared to existing technology:
The nanoscale K of chromium cast iron contained of the present invention in the lost foam casting coating composition 2OAl 2O 36SiO 2Composite granule has a large amount of micro interfaces, has good thermal insulation; And have higher body intensity, significantly improved the high low temperature intensity of coating.Nanoscale K 2OAl 2O 36SiO 2Composite granule has good suspension under the effect of neopelex.
Ludox and the combination of 3-M2BOL acetic acid esters composite solution in the coating of the present invention by strengthening the cross-link intensity of adhesive material in the nano coating, have improved high temperature and the low temperature intensity of coating greatly.In addition, Ludox and 3-M2BOL acetic acid esters composite solution and nanoscale K 2OAl 2O 36SiO 2Composite granule has good affinity, also can significantly improve high temperature and the low temperature intensity of coating.
The slag powder has the microcosmic porous in the coating of the present invention, both can improve the heat-insulating capability of material, and reduces cost.
It has good heat insulation heat resistance, good suspension coating of the present invention.
Description of drawings
Fig. 1 is that the chromium cast iron contained that the embodiment of the invention 1 obtains is organized with lost foam casting coating.
As seen from Figure 1, after this coating was coated in the evaporative pattern surface, even tissue was closely knit.
The specific embodiment:
Used Ludox model adopts the JN-30 Ludox in following examples; Used polyvinyl alcohol model is 2488.
Embodiment one:
Chromium cast iron contained of the present invention is as follows with the preparation process of lost foam casting coating:
1) nanoscale K 2OAl 2O 36SiO 2Composite granule is prepared:
With ZrOCl 2.8H 2O and water are made the ZrOCl that concentration is 0.2mol/L 2The aqueous solution; 25% ammoniacal liquor is diluted 10 times as precipitating reagent;
Be that 50kHz, power are under the condition of 400W continuous stirring, with ZrOCl in supersonic frequency 2The aqueous solution is added drop-wise in the precipitating reagent with the speed of 2mL/min, and the pH value of control solution is 9; After dropwising, continue to stir 3h, then leave standstill aging 6h, obtain Zr (OH) 4Hydrosol A is stand-by;
FeCl with 100g 36H 2O and 37gFeCl 24H 2O mixes, and 214g glucan T-40 is dissolved under the environment of inflated with nitrogen in the 1500ml pure water, adds FeCl again 36H 2O and FeCl 24H 2The mixture of O; Stir with constant temperature blender with magnetic force, drip simultaneously 30% ammoniacal liquor 1200ml, be warming up to 80 ℃, 1200r/min, reaction 1h obtains colloid B;
With hydrosol A, colloid B and K 2OAl 2O 36SiO 2Powder mixes for 0.6:1:0.8 in mass ratio; K 2OAl 2O 36SiO 2The particle diameter of powder is 60-80nm; Under supersonic frequency 50kHz power, 400W in 50-55 ℃ of ultrasonic agitation 0.5h; Then in the dry 5h of 100 ℃ of lower normal pressures (atmospheric pressure), namely obtain nanoscale K 2OAl 2O 36SiO 2Composite granule;
2) preparation of 3-M2BOL acetic acid esters composite solution: wherein the percentage by weight of each composition is: dioctyl phthalate 5%, n-butanol 1%, polyvinyl alcohol 6%, potassium peroxydisulfate 0.16%, 3-M2BOL acetic acid esters 48%, surplus are water; First dioctyl phthalate is mixed with n-butanol, stir and make its dissolving, it is stand-by to form the solution first; Add entry in container, be heated to 80 ℃, under agitation add polyvinyl alcohol, be warming up to 95 ℃, insulation is to all dissolvings; After dissolving, stopped heating makes temperature be down to 68~70 ℃, under agitation adds the 3-M2BOL acetic acid esters, and it is stand-by to form solution second; Solution first and solution second are mixed, add potassium peroxydisulfate, mix, be warmed up between 65~70 ℃, stopped 1 hour, obtain 3-M2BOL acetic acid esters composite solution, stand-by;
3) chromium cast iron contained prepares with lost foam casting coating: each composition is prepared as following weight percent: above-mentioned nanoscale K 2OAl 2O 36SiO 2Composite granule 15%, blast-furnace slag powder 8%, neopelex 0.15%, sodium bentonite 2%, Ludox 1%, above-mentioned 3-M2BOL acetic acid esters composite solution 5%, all the other are silica flour; Then each composition being put into container stirs and namely gets coating of the present invention.
Embodiment two:
Nanoscale K in the step 1) 2OAl 2O 36SiO 2Composite granule is prepared: hydrosol A, colloid B and K 2OAl 2O 36SiO 2The powder mixing quality is than being 0.6:1:1.0.
The step 3) chromium cast iron contained prepares with lost foam casting coating: the percentage by weight of each composition is: nanoscale K 2OAl 2O 36SiO 2Composite granule 15-20%, slag powder 12%, neopelex 0.2%, sodium bentonite 5%, Ludox 2.5%, 3-M2BOL acetic acid esters composite solution 8%, silica flour all the other.
All the other processes are with embodiment one.
Embodiment three:
Nanoscale K in the step 1) 2OAl 2O 36SiO 2Composite granule is prepared: hydrosol A, colloid B and K 2OAl 2O 36SiO 2The powder mixing quality is than being 0.6:1:1.1.
The step 3) chromium cast iron contained prepares with lost foam casting coating: the percentage by weight of each composition is: nanoscale K 2OAl 2O 36SiO 2Composite granule 17%, slag powder 10%, neopelex 0.17%, sodium bentonite 4%, Ludox 1.5%, 3-M2BOL acetic acid esters composite solution 6%, silica flour all the other.
All the other processes are with embodiment one.
Embodiment four: (proportioning components is not in scope of design of the present invention)
Nanoscale K in the step 1) 2OAl 2O 36SiO 2Composite granule is prepared: hydrosol A, colloid B and K 2OAl 2O 36SiO 2The powder mixing quality is than being 0.6:1:1.3.
The step 3) chromium cast iron contained prepares with lost foam casting coating: the percentage by weight of each composition is: nanoscale K 2OAl 2O 36SiO 2Composite granule 15-20%, slag powder 5%, neopelex 0.1%, sodium bentonite 1%, Ludox 0.5%, 3-M2BOL acetic acid esters composite solution 4%, silica flour all the other.
All the other processes are with embodiment one.
Embodiment five: (proportioning components is not in scope of design of the present invention)
Nanoscale K in the step 1) 2OAl 2O 36SiO 2Composite granule is prepared: hydrosol A, colloid B and K 2OAl 2O 36SiO 2The powder mixing quality is than being 0.6:1:0.7.
The step 3) chromium cast iron contained prepares with lost foam casting coating: the percentage by weight of composition is: nanoscale K 2OAl 2O 36SiO 2Composite granule 23%, slag powder 14%, neopelex 0.3%, sodium bentonite 6%, Ludox 3.5%, 3-M2BOL acetic acid esters composite solution 9%, silica flour all the other.
All the other processes are with embodiment one.
Test: the performance measurement of the corresponding coating of the present invention of following table and contrast coating 1, the suspensibility of coating is directly tested.The high and low temperature strength detection need be brushed on the evaporative pattern surface and carry out.
Finish code Material composition 72 hours suspensibilities are greater than/% Low temperature intensity is greater than/g(2 layer 1.0mm) Elevated temperature strength is greater than/g (1200 degree roasting).
Contrast coating 1 201210319941.2 number coating that obtains of application 98 800 650
Coating 1 The coating of embodiment one preparation 99 860 700
Coating 2 The coating of embodiment two preparations 100 890 710
Coating 3 The coating of embodiment three preparations 100 890 720
Coating 4 The coating of embodiment four preparations 97 820 680
Coating 5 The coating of embodiment five preparations 96 830 700
Ludox and 3-M2BOL acetic acid esters composite solution in the coating of the present invention, the very few solvent action that do not have too much can dilute the heat insulation composition of coating; Neopelex is the enhancing component in the coating, does not very fewly have a bonding effect, too much can dilute composite granule and 3-M2BOL acetic acid esters composite solution; Nanoscale K 2OAl 2O 36SiO 2The very few heat-blocking action that do not have of composite granule too much can reduce the bonding effect of bonding agent.

Claims (5)

1. plant the chromium cast iron contained lost foam casting coating, it is characterized in that: the percentage by weight of each composition is in this coating: nanoscale K 2OAl 2O 36SiO 2Composite granule 15-20%, blast-furnace slag powder 8-12%, neopelex 0.15-0.2%, sodium bentonite 2-5%, Ludox 1-2.5%, 3-M2BOL acetic acid esters composite solution 5-8%, all the other are silica flour;
Wherein the blast-furnace slag composition percentage by weight be CaO 36-40%, Al 2O 313-15%, MgO 6-9%, S 0.6-0.9%, FeO 0.3-0.5%, all the other are SiO 2
Nanoscale K 2OAl 2O 36SiO 2The particle diameter of composite granule is 80-100nm, and the particle diameter of sodium bentonite and blast-furnace slag powder is 80-100 μ m, and the particle diameter of silica flour is 1-5mm.
2. chromium cast iron contained lost foam casting coating according to claim 1, it is characterized in that: described 3-M2BOL acetic acid esters composite solution is formulated by the following method: wherein raw materials used percentage by weight is: dioctyl phthalate 4-6%, n-butanol 1-2%, polyvinyl alcohol 4-8%, potassium peroxydisulfate 0.15-0.19%, 3-M2BOL acetic acid esters 45-50%, surplus is water; First dioctyl phthalate is mixed with n-butanol, stir and make its dissolving, it is stand-by to form the solution first; Add entry in container, be heated to 80 ℃, under agitation add polyvinyl alcohol, be warming up to 95 ℃, insulation is to all dissolvings; After dissolving, stopped heating makes temperature be down to 68~70 ℃, under agitation adds the 3-M2BOL acetic acid esters, and it is stand-by to form solution second; Solution first and solution second are mixed, add potassium peroxydisulfate, mix, be warmed up between 65~70 ℃, stopped 1 hour, obtain 3-M2BOL acetic acid esters composite solution.
3. a chromium cast iron contained is with the preparation method of lost foam casting coating, and it is characterized in that: the method may further comprise the steps:
1) nanoscale K 2OAl 2O 36SiO 2Composite granule is prepared:
Preparation ZrOCl 2The aqueous solution, with ammoniacal liquor as precipitating reagent; Be that 50kHz, power are under the condition of 400W continuous stirring, with ZrOCl in supersonic frequency 2The aqueous solution is added drop-wise in the precipitating reagent with the speed of 2mL/min, and the pH value of control solution is 9; After dropwising, continue to stir 3h, then leave standstill aging 6h, obtain Zr (OH) 4Hydrosol A is stand-by;
With FeCl 36H 2O and FeCl 24H 2O mixes, and glucan T-40 is dissolved in the pure water under the environment of inflated with nitrogen, adds FeCl again 36H 2O and FeCl 24H 2The O mixture; Stir with constant temperature blender with magnetic force, drip simultaneously 30% ammoniacal liquor 1200ml, be warming up to 80 ℃, 1200r/min, reaction 1h obtains colloid B; FeCl wherein 36H 2O, FeCl 24H 2The weight ratio of O, glucan T-40 and pure water is 100:37:214:1500; The volume ratio 15:12 of pure water and ammoniacal liquor;
With hydrosol A, colloid B and K 2OAl 2O 36SiO 2Powder mixes for 0.6:1:0.8-1.1 in mass ratio; K 2OAl 2O 36SiO 2The particle diameter of powder is 60-80nm; Under supersonic frequency 50kHz power, 400W in 50-55 ℃ of ultrasonic agitation 0.5h; Then in 100 ℃ of lower constant pressure and dry 5h, namely obtain nanoscale K 2OAl 2O 36SiO 2Composite granule;
2) preparation of 3-M2BOL acetic acid esters composite solution: wherein raw materials used percentage by weight is: dioctyl phthalate 4-6%, n-butanol 1-2%, polyvinyl alcohol 4-8%, potassium peroxydisulfate 0.15-0.19%, 3-M2BOL acetic acid esters 45-50%, surplus is water; First dioctyl phthalate is mixed with n-butanol, stir and make its dissolving, it is stand-by to form the solution first; Add entry in container, be heated to 80 ℃, under agitation add polyvinyl alcohol, be warming up to 95 ℃, insulation is to all dissolvings; After dissolving, stopped heating makes temperature be down to 68~70 ℃, under agitation adds the 3-M2BOL acetic acid esters, and it is stand-by to form solution second; Solution first and solution second are mixed, add potassium peroxydisulfate, mix, be warmed up between 65~70 ℃, stopped 1 hour, obtain 3-M2BOL acetic acid esters composite solution, stand-by;
3) chromium cast iron contained prepares with lost foam casting coating: each composition is prepared as following weight percent: above-mentioned nanoscale K 2OAl 2O 36SiO 2Composite granule 15-20%, blast-furnace slag powder 8-12%, neopelex 0.15-0.2%, sodium bentonite 2-5%, Ludox 1-2.5%, 3-M2BOL acetic acid esters composite solution 5-8%, all the other are silica flour; Then each composition being put into container stirs and get final product.
4. described chromium cast iron contained is with the preparation method of lost foam casting coating according to claim 3, and it is characterized in that: step 1) prepares Zr (OH) 4ZrOCl among the hydrosol A 2Dense the crossing of the aqueous solution is 0.2mol/L.
5. described chromium cast iron contained is with the preparation method of lost foam casting coating according to claim 3, and it is characterized in that: step 1) prepares Zr (OH) 4Ammoniacal liquor as precipitating reagent among the hydrosol A adopts 2.5% ammoniacal liquor.
CN201310029398.7A 2013-01-25 2013-01-25 Lost foam casting paint for chromium-containing cast iron and preparation method thereof Active CN103056288B (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103302238A (en) * 2013-06-24 2013-09-18 朱小英 Preparation method of low-cost high-performance lost foam casting coating
CN105057573A (en) * 2015-07-27 2015-11-18 明光市留香泵业有限公司 High-permeability water-based paint containing nanometer activated carbon for lost foam casting and manufacturing method of water-based paint
CN106964752A (en) * 2017-05-17 2017-07-21 东风精密铸造安徽有限公司 A kind of resin-coated sand shell mould cast carbon steel formulation for coating material and preparation technology

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JPS59130644A (en) * 1983-01-17 1984-07-27 Nippon Yakin Kogyo Co Ltd Mold coating material for furan resin casting mold
JP2006181579A (en) * 2004-12-27 2006-07-13 Kao Corp Composition of facing material
CN101491823A (en) * 2009-03-06 2009-07-29 靖江市黎明铸造材料厂 Centrifugal casting roller coatings and preparation method thereof
CN102836961A (en) * 2012-10-09 2012-12-26 嘉禾巨人机床有限公司 Lost foam coating for large casting and preparation method of lost foam coating

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59130644A (en) * 1983-01-17 1984-07-27 Nippon Yakin Kogyo Co Ltd Mold coating material for furan resin casting mold
JP2006181579A (en) * 2004-12-27 2006-07-13 Kao Corp Composition of facing material
CN101491823A (en) * 2009-03-06 2009-07-29 靖江市黎明铸造材料厂 Centrifugal casting roller coatings and preparation method thereof
CN102836961A (en) * 2012-10-09 2012-12-26 嘉禾巨人机床有限公司 Lost foam coating for large casting and preparation method of lost foam coating

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103302238A (en) * 2013-06-24 2013-09-18 朱小英 Preparation method of low-cost high-performance lost foam casting coating
CN103302238B (en) * 2013-06-24 2015-07-01 李露青 Preparation method of low-cost high-performance lost foam casting coating
CN105057573A (en) * 2015-07-27 2015-11-18 明光市留香泵业有限公司 High-permeability water-based paint containing nanometer activated carbon for lost foam casting and manufacturing method of water-based paint
CN106964752A (en) * 2017-05-17 2017-07-21 东风精密铸造安徽有限公司 A kind of resin-coated sand shell mould cast carbon steel formulation for coating material and preparation technology

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