CN112341868A - Preparation method of starch-based lost foam coating - Google Patents
Preparation method of starch-based lost foam coating Download PDFInfo
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- CN112341868A CN112341868A CN202011363146.4A CN202011363146A CN112341868A CN 112341868 A CN112341868 A CN 112341868A CN 202011363146 A CN202011363146 A CN 202011363146A CN 112341868 A CN112341868 A CN 112341868A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D103/00—Coating compositions based on starch, amylose or amylopectin or on their derivatives or degradation products
- C09D103/02—Starch; Degradation products thereof, e.g. dextrin
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
Abstract
The invention discloses a preparation method of a starch-based lost foam coating; relates to the technical field of casting, and comprises the following steps: (1) starch treatment; (2) treating quartz sand; (3) stirring and mixing; the method can remarkably promote the improvement of the bending strength of the coating, can be better suitable for the casting process of the casting by greatly improving the bending strength, reduces the rejection rate and improves the quality of the casting.
Description
Technical Field
The invention belongs to the technical field of casting, and particularly relates to a preparation method of a starch-based lost foam coating.
Background
The lost foam coating is an essential auxiliary material for obtaining a high-quality casting with a smooth surface by lost foam casting, and if the performance, preparation and drying of the coating are in trouble, the casting can generate phenomena of unstable quality, increased rejection rate and the like. The using performance of the coating for lost foam casting is mainly thermal performance and air permeability, the thermal performance mainly refers to good thermal conductivity and low thermal expansion coefficient, so that sand and slag adhering to the surface of a casting during casting can be prevented, the air permeability directly controls the escaping speed of products generated by melting and decomposing foam, the flowing speed of liquid metal is determined, and further the generation of defects such as air holes, cold shut, no casting and carbon deposition can be eliminated. Lost foam coatings generally consist of refractory aggregate, binder, carrier, suspending agent and other additives.
In the prior art, the lost foam coating adopts organic polymer as a binder, although the binding strength is high, the phenomenon of insufficient combustion can occur in the casting process, so that the casting defect is caused, and the quality of the casting is reduced.
Disclosure of Invention
The invention aims to provide a preparation method of a starch-based lost foam coating, which aims to overcome the defects in the prior art.
The technical scheme adopted by the invention is as follows:
a preparation method of a starch-based lost foam coating comprises the following steps:
(1) starch treatment;
sequentially adding starch and water into a stirrer, heating to 80-90 ℃, and stirring for 40-50min under heat preservation to obtain starch slurry;
adjusting the pH value of the starch slurry to 10-10.8, and stirring for 30min under heat preservation to obtain alkaline starch slurry;
sequentially adding sodium hydroxymethyl cellulose, sodium silicate and ethyl cellulose into the alkaline starch slurry, and then continuously stirring for 1-1.5 hours to obtain a starch mixed solution;
(2) quartz sand treatment:
mixing quartz sand and zeolite powder according to a mass ratio of 10:1, placing the mixture in a resistance furnace, heating to 800-900 ℃, preserving heat for 40-45min, then cooling to room temperature by water, drying to constant weight, adding the mixture into a ball mill, adding a grinding aid at the same time, carrying out ball milling for 3-4 hours, and then sieving with a 120-mesh sieve to obtain quartz sand powder;
(3) stirring and mixing:
and sequentially adding the starch mixed liquor, the quartz sand powder and the auxiliary agent into a stirrer, and stirring for 1.5-2 hours in sections to obtain the starch-quartz sand.
The starch is formed by mixing cassava starch and soybean starch;
the mass ratio of the cassava starch to the soybean starch is 3: 1;
the mixing mass ratio of the starch to the water is as follows: 1:9-11.
The pH value of the starch slurry is adjusted by adopting a sodium hydroxide solution;
the mass fraction of the sodium hydroxide solution is 8.5%.
The mass fraction of the sodium carboxymethyl cellulose in the starch mixed solution is 4-5%;
the mass fraction of the sodium silicate is 7-7.8%;
the mass ratio of the ethyl cellulose to the sodium hydroxymethyl cellulose is 1: 3.
The grinding aid is ethanol;
the mixing mass ratio of the quartz sand to the grinding aid is 5: 1-1.5;
the ball milling speed is 2000 r/min.
The sectional type stirring is as follows: stirring for three times;
the first stirring time is 20-25min, the stirring temperature is 60-64 ℃, and the stirring speed is 1500 r/min;
the second stirring time is 30-35min, the stirring temperature is 50-55 ℃, and the stirring speed is 1800 r/min;
the third stirring time is 30-35min, the stirring temperature is 42-48 ℃, and the stirring speed is 2500 r/min.
The sintering temperature of the coating is 1520 ℃.
The high-temperature sintering of the coating can promote the coating to further shrink, the arrangement of crystals is more compact, the degree of crystallization is higher, and thus the mechanical property of the coating is greatly improved, particularly the bending strength of the coating is greatly improved.
Has the advantages that:
the method can obviously promote the improvement of the bending strength of the coating, can be better adapted to the casting process of the casting through greatly improving the bending strength of the coating, reduces the rejection rate and improves the quality of the casting.
After sintering and forming, the coating prepared by the method mainly shows a certain degree of liquid phase sintering, and is tightly combined with quartz sand particles to form a complex compound, so that the mechanical property of the coating is greatly improved.
Detailed Description
A preparation method of a starch-based lost foam coating comprises the following steps:
(1) starch treatment;
sequentially adding starch and water into a stirrer, heating to 80-90 ℃, and stirring for 40-50min under heat preservation to obtain starch slurry;
adjusting the pH value of the starch slurry to 10-10.8, and stirring for 30min under heat preservation to obtain alkaline starch slurry;
sequentially adding sodium hydroxymethyl cellulose, sodium silicate and ethyl cellulose into the alkaline starch slurry, and then continuously stirring for 1-1.5 hours to obtain a starch mixed solution;
(2) quartz sand treatment:
mixing quartz sand and zeolite powder according to a mass ratio of 10:1, placing the mixture in a resistance furnace, heating to 800-900 ℃, preserving heat for 40-45min, then cooling to room temperature by water, drying to constant weight, adding the mixture into a ball mill, adding a grinding aid at the same time, carrying out ball milling for 3-4 hours, and then sieving with a 120-mesh sieve to obtain quartz sand powder;
(3) stirring and mixing:
and sequentially adding the starch mixed liquor, the quartz sand powder and the auxiliary agent into a stirrer, and stirring for 1.5-2 hours in sections to obtain the starch-quartz sand.
The starch is formed by mixing cassava starch and soybean starch;
the mass ratio of the cassava starch to the soybean starch is 3: 1;
the mixing mass ratio of the starch to the water is as follows: 1:9-11.
The pH value of the starch slurry is adjusted by adopting a sodium hydroxide solution;
the mass fraction of the sodium hydroxide solution is 8.5%.
The mass fraction of the sodium carboxymethyl cellulose in the starch mixed solution is 4-5%;
the mass fraction of the sodium silicate is 7-7.8%;
the mass ratio of the ethyl cellulose to the sodium hydroxymethyl cellulose is 1: 3.
The grinding aid is ethanol;
the mixing mass ratio of the quartz sand to the grinding aid is 5: 1-1.5;
the ball milling speed is 2000 r/min.
The sectional type stirring is as follows: stirring for three times;
the first stirring time is 20-25min, the stirring temperature is 60-64 ℃, and the stirring speed is 1500 r/min;
the second stirring time is 30-35min, the stirring temperature is 50-55 ℃, and the stirring speed is 1800 r/min;
the third stirring time is 30-35min, the stirring temperature is 42-48 ℃, and the stirring speed is 2500 r/min.
The following will clearly and completely describe the technical solutions of the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A preparation method of a starch-based lost foam coating comprises the following steps:
(1) starch treatment;
sequentially adding starch and water into a stirrer, heating to 80 ℃, and stirring for 40min under the condition of heat preservation to obtain starch slurry; adjusting the pH value of the starch slurry to 10, and stirring for 30min under the condition of heat preservation to obtain alkaline starch slurry;
sequentially adding sodium hydroxymethyl cellulose, sodium silicate and ethyl cellulose into the alkaline starch slurry, and then continuously stirring for 1 hour to obtain a starch mixed solution; the starch is formed by mixing cassava starch and soybean starch; the mass ratio of the cassava starch to the soybean starch is 3: 1; the mixing mass ratio of the starch to the water is as follows: 1:9. The pH value of the starch slurry is adjusted by adopting a sodium hydroxide solution; the mass fraction of the sodium hydroxide solution is 8.5%. The mass fraction of the sodium carboxymethyl cellulose in the starch mixed solution is 4%; the mass fraction of the sodium silicate is 7 percent; the mass ratio of the ethyl cellulose to the sodium hydroxymethyl cellulose is 1: 3.
(2) Quartz sand treatment:
mixing quartz sand and zeolite powder according to a mass ratio of 10:1, placing the mixture in a resistance furnace, heating to 800 ℃, preserving heat for 40min, then cooling to room temperature by water, drying to constant weight, adding the mixture into a ball mill, adding a grinding aid, carrying out ball milling for 3 hours, and then sieving by a 120-mesh sieve to obtain quartz sand powder; the grinding aid is ethanol; the mixing mass ratio of the quartz sand to the grinding aid is 5: 1; the ball milling speed is 2000 r/min.
(3) Stirring and mixing:
and sequentially adding the starch mixed liquor, the quartz sand powder and the auxiliary agent into a stirrer, and stirring for 1.5 hours in sections to obtain the starch-quartz sand composite material. The sectional type stirring is as follows: stirring for three times; the first stirring time is 20min, the stirring temperature is 60 ℃, and the stirring speed is 1500 r/min; the second stirring time is 30min, the stirring temperature is 50 ℃, and the stirring speed is 1800 r/min; the third stirring time is 30min, the stirring temperature is 42 ℃, and the stirring speed is 2500 r/min.
Example 2
A preparation method of a starch-based lost foam coating comprises the following steps:
(1) starch treatment;
sequentially adding starch and water into a stirrer, heating to 90 ℃, and stirring for 50min under heat preservation to obtain starch slurry; adjusting the pH value of the starch slurry to 10.8, and stirring for 30min under the condition of heat preservation to obtain alkaline starch slurry;
sequentially adding sodium hydroxymethyl cellulose, sodium silicate and ethyl cellulose into the alkaline starch slurry, and then continuously stirring for 1.5 hours to obtain a starch mixed solution; the starch is formed by mixing cassava starch and soybean starch; the mass ratio of the cassava starch to the soybean starch is 3: 1; the mixing mass ratio of the starch to the water is as follows: 1:11. The pH value of the starch slurry is adjusted by adopting a sodium hydroxide solution; the mass fraction of the sodium hydroxide solution is 8.5%. The mass fraction of the sodium carboxymethyl cellulose in the starch mixed solution is 5 percent; the mass fraction of the sodium silicate is 7.8%; the mass ratio of the ethyl cellulose to the sodium hydroxymethyl cellulose is 1: 3.
(2) Quartz sand treatment:
mixing quartz sand and zeolite powder according to a mass ratio of 10:1, placing the mixture in a resistance furnace, heating to 900 ℃, preserving heat for 45min, then cooling to room temperature by water, drying to constant weight, adding the mixture into a ball mill, adding a grinding aid, carrying out ball milling for 4 hours, and then sieving by a 120-mesh sieve to obtain quartz sand powder; the grinding aid is ethanol; the mixing mass ratio of the quartz sand to the grinding aid is 5: 1.5; the ball milling speed is 2000 r/min.
(3) Stirring and mixing:
and sequentially adding the starch mixed liquor, the quartz sand powder and the auxiliary agent into a stirrer, and stirring for 2 hours in sections to obtain the starch-quartz sand. The sectional type stirring is as follows: stirring for three times; the first stirring time is 25min, the stirring temperature is 64 ℃, and the stirring speed is 1500 r/min; the second stirring time is 35min, the stirring temperature is 55 ℃, and the stirring speed is 1800 r/min; the third stirring time is 35min, the stirring temperature is 48 ℃, and the stirring speed is 2500 r/min.
Example 3
A preparation method of a starch-based lost foam coating comprises the following steps:
(1) starch treatment;
sequentially adding starch and water into a stirrer, heating to 82 ℃, and stirring for 44min under the condition of heat preservation to obtain starch slurry; adjusting the pH value of the starch slurry to 10.5, and stirring for 30min under the condition of heat preservation to obtain alkaline starch slurry;
sequentially adding sodium hydroxymethyl cellulose, sodium silicate and ethyl cellulose into the alkaline starch slurry, and then continuously stirring for 1.4 hours to obtain a starch mixed solution; the starch is formed by mixing cassava starch and soybean starch; the mass ratio of the cassava starch to the soybean starch is 3: 1; the mixing mass ratio of the starch to the water is as follows: 1:10. The pH value of the starch slurry is adjusted by adopting a sodium hydroxide solution; the mass fraction of the sodium hydroxide solution is 8.5%. The mass fraction of the sodium carboxymethyl cellulose in the starch mixed solution is 4.7 percent; the mass fraction of the sodium silicate is 7.2%; the mass ratio of the ethyl cellulose to the sodium hydroxymethyl cellulose is 1: 3.
(2) Quartz sand treatment:
mixing quartz sand and zeolite powder according to a mass ratio of 10:1, placing the mixture in a resistance furnace, heating to 830 ℃, preserving heat for 42min, then cooling to room temperature by water, drying to constant weight, adding the mixture into a ball mill, adding a grinding aid, performing ball milling for 3.8 hours, and then sieving by a 120-mesh sieve to obtain quartz sand powder; the grinding aid is ethanol; the mixing mass ratio of the quartz sand to the grinding aid is 5: 1.4; the ball milling speed is 2000 r/min.
(3) Stirring and mixing:
and sequentially adding the starch mixed liquor, the quartz sand powder and the auxiliary agent into a stirrer, and stirring for 1.6 hours in sections to obtain the starch-quartz sand composite material. The sectional type stirring is as follows: stirring for three times; the first stirring time is 22min, the stirring temperature is 62 ℃, and the stirring speed is 1500 r/min; the second stirring time is 31min, the stirring temperature is 54 ℃, and the stirring speed is 1800 r/min; the third stirring time is 31min, the stirring temperature is 45 ℃, and the stirring speed is 2500 r/min.
Example 4
A preparation method of a starch-based lost foam coating comprises the following steps:
(1) starch treatment;
sequentially adding starch and water into a stirrer, heating to 86 ℃, and stirring for 45min under the condition of heat preservation to obtain starch slurry; adjusting the pH value of the starch slurry to 10.3, and stirring for 30min under the condition of heat preservation to obtain alkaline starch slurry;
sequentially adding sodium hydroxymethyl cellulose, sodium silicate and ethyl cellulose into the alkaline starch slurry, and then continuously stirring for 1.2 hours to obtain a starch mixed solution; the starch is formed by mixing cassava starch and soybean starch; the mass ratio of the cassava starch to the soybean starch is 3: 1; the mixing mass ratio of the starch to the water is as follows: 1:10.5. The pH value of the starch slurry is adjusted by adopting a sodium hydroxide solution; the mass fraction of the sodium hydroxide solution is 8.5%. The mass fraction of the sodium carboxymethyl cellulose in the starch mixed solution is 4.5 percent; the mass fraction of the sodium silicate is 7.3 percent; the mass ratio of the ethyl cellulose to the sodium hydroxymethyl cellulose is 1: 3.
(2) Quartz sand treatment:
mixing quartz sand and zeolite powder according to a mass ratio of 10:1, placing the mixture in a resistance furnace, heating to 840 ℃, preserving heat for 42min, then cooling to room temperature by water, drying to constant weight, adding the mixture into a ball mill, adding a grinding aid, performing ball milling for 3.5 hours, and then sieving by a 120-mesh sieve to obtain quartz sand powder; the grinding aid is ethanol; the mixing mass ratio of the quartz sand to the grinding aid is 5: 1.2; the ball milling speed is 2000 r/min.
(3) Stirring and mixing:
and sequentially adding the starch mixed liquor, the quartz sand powder and the auxiliary agent into a stirrer, and stirring for 1.8 hours in sections to obtain the starch-quartz sand composite material. The sectional type stirring is as follows: stirring for three times; the first stirring time is 24min, the stirring temperature is 62 ℃, and the stirring speed is 1500 r/min; the second stirring time is 32min, the stirring temperature is 53 ℃, and the stirring speed is 1800 r/min; the third stirring time is 32min, the stirring temperature is 44 ℃, and the stirring speed is 2500 r/min.
Test of
And (3) testing the bending strength:
pouring the paints of the examples and the comparative examples into a template with the thickness of 70 multiplied by 30 multiplied by 5mm, then sintering for 40min at 1520 ℃, and naturally cooling to room temperature to obtain a standard coating sheet;
the bending strength testing instrument is an anti-bending instrument, and the calculation formula is as follows:
M=（3Fb·Ls）/（2b·h²）；
m-bending strength, MPa;
Fb-breaking loading force, N;
ls-distance between two points, mm;
b-sample thickness, mm;
h-width of sample, mm;
(5 experiments per group, average);
TABLE 1
| Bending strength MPa | |
| Example 1 | 10.23 |
| Example 2 | 10.11 |
| Example 3 | 10.34 |
| Example 4 | 10.63 |
| Comparative example 1 | 6.09 |
Comparative example 1: the difference from the embodiment 4 is that no zeolite powder is added into the quartz sand powder;
as can be seen from Table 1, the method of the invention can significantly improve the bending strength of the coating, and by greatly improving the bending strength, the method can be better adapted to the casting process of castings, reduce the rejection rate and improve the quality of the castings.
Based on the test of example 4, the influence of different sintering temperatures on the bending strength of the coating is compared;
the preparation method comprises the following steps of (1);
TABLE 1
| Sintering temperature C | Bending strength MPa |
| 1200 | 6.35 |
| 1300 | 7.01 |
| 1400 | 9.32 |
| 1500 | 10.01 |
| 1520 | 10.63 |
| 1580 | 10.58 |
| 1600 | 10.45 |
As can be seen from Table 2, the coating prepared by the method of the present invention has excellent mechanical properties after sintering, the bending strength of the coating gradually increases with the increase of the sintering temperature, but the bending strength of the coating cannot be increased continuously but is reduced slightly after the sintering temperature is increased continuously to a certain temperature.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention, and the present invention is not limited to the illustrated embodiments, and all the modifications and equivalents of the embodiments may be made without departing from the spirit of the present invention.
Claims (6)
1. A preparation method of a starch-based lost foam coating is characterized by comprising the following steps:
(1) starch treatment;
sequentially adding starch and water into a stirrer, heating to 80-90 ℃, and stirring for 40-50min under heat preservation to obtain starch slurry;
adjusting the pH value of the starch slurry to 10-10.8, and stirring for 30min under heat preservation to obtain alkaline starch slurry;
sequentially adding sodium hydroxymethyl cellulose, sodium silicate and ethyl cellulose into the alkaline starch slurry, and then continuously stirring for 1-1.5 hours to obtain a starch mixed solution;
(2) quartz sand treatment:
mixing quartz sand and zeolite powder according to a mass ratio of 10:1, placing the mixture in a resistance furnace, heating to 800-900 ℃, preserving heat for 40-45min, then cooling to room temperature with water, drying to constant weight, adding the mixture into a ball mill, adding a grinding aid at the same time, carrying out ball milling for 3-4 hours, and then sieving with a 120-mesh sieve to obtain quartz sand powder;
(3) stirring and mixing:
and sequentially adding the starch mixed liquor, the quartz sand powder and the auxiliary agent into a stirrer, and stirring for 1.5-2 hours in sections to obtain the starch-quartz sand.
2. The method for preparing a starch-based lost foam coating according to claim 1, wherein: the starch is formed by mixing cassava starch and soybean starch;
the mass ratio of the cassava starch to the soybean starch is 3: 1;
the mixing mass ratio of the starch to the water is as follows: 1:9-11.
3. The method for preparing a starch-based lost foam coating according to claim 1, wherein: the pH value of the starch slurry is adjusted by adopting a sodium hydroxide solution;
the mass fraction of the sodium hydroxide solution is 8.5%.
4. The method for preparing a starch-based lost foam coating according to claim 1, wherein: the mass fraction of the sodium carboxymethyl cellulose in the starch mixed solution is 4-5%;
the mass fraction of the sodium silicate is 7-7.8%;
the mass ratio of the ethyl cellulose to the sodium hydroxymethyl cellulose is 1: 3.
5. The method for preparing a starch-based lost foam coating according to claim 1, wherein: the grinding aid is ethanol;
the mixing mass ratio of the quartz sand to the grinding aid is 5: 1-1.5;
the ball milling speed is 2000 r/min.
6. The method for preparing a starch-based lost foam coating according to claim 1, wherein: the sectional type stirring is as follows: stirring for three times;
the first stirring time is 20-25min, the stirring temperature is 60-64 ℃, and the stirring speed is 1500 r/min;
the second stirring time is 30-35min, the stirring temperature is 50-55 ℃, and the stirring speed is 1800 r/min;
the third stirring time is 30-35min, the stirring temperature is 42-48 ℃, and the stirring speed is 2500 r/min.
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