CN114453555B - Preparation process of high-temperature-resistant precoated sand - Google Patents
Preparation process of high-temperature-resistant precoated sand Download PDFInfo
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- CN114453555B CN114453555B CN202210090419.5A CN202210090419A CN114453555B CN 114453555 B CN114453555 B CN 114453555B CN 202210090419 A CN202210090419 A CN 202210090419A CN 114453555 B CN114453555 B CN 114453555B
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- 239000004576 sand Substances 0.000 title claims abstract description 122
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims abstract description 41
- 229920001568 phenolic resin Polymers 0.000 claims abstract description 41
- 239000005011 phenolic resin Substances 0.000 claims abstract description 41
- 239000011248 coating agent Substances 0.000 claims abstract description 26
- 238000000576 coating method Methods 0.000 claims abstract description 26
- 229920002379 silicone rubber Polymers 0.000 claims abstract description 21
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 52
- 239000007788 liquid Substances 0.000 claims description 29
- 238000002156 mixing Methods 0.000 claims description 23
- 238000010438 heat treatment Methods 0.000 claims description 19
- 238000003756 stirring Methods 0.000 claims description 18
- 238000005507 spraying Methods 0.000 claims description 16
- 238000003892 spreading Methods 0.000 claims description 15
- 230000007480 spreading Effects 0.000 claims description 15
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 10
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 10
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 9
- 239000004945 silicone rubber Substances 0.000 claims description 9
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 7
- 229910052750 molybdenum Inorganic materials 0.000 claims description 7
- 239000011733 molybdenum Substances 0.000 claims description 7
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 6
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 6
- 229910052796 boron Inorganic materials 0.000 claims description 6
- 239000012528 membrane Substances 0.000 claims description 6
- 229920005989 resin Polymers 0.000 claims description 6
- 239000011347 resin Substances 0.000 claims description 6
- 238000004381 surface treatment Methods 0.000 claims description 6
- 229910052719 titanium Inorganic materials 0.000 claims description 6
- 239000010936 titanium Substances 0.000 claims description 6
- 238000011049 filling Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- KBJFYLLAMSZSOG-UHFFFAOYSA-N n-(3-trimethoxysilylpropyl)aniline Chemical compound CO[Si](OC)(OC)CCCNC1=CC=CC=C1 KBJFYLLAMSZSOG-UHFFFAOYSA-N 0.000 claims description 5
- 230000007935 neutral effect Effects 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 238000001179 sorption measurement Methods 0.000 claims description 5
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 4
- BTXFTCVNWMNXKH-UHFFFAOYSA-N NC1=CC=CC=C1.CCO[Si](C)(OCC)OCC Chemical compound NC1=CC=CC=C1.CCO[Si](C)(OCC)OCC BTXFTCVNWMNXKH-UHFFFAOYSA-N 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims 1
- 238000005266 casting Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 4
- 230000004048 modification Effects 0.000 abstract description 3
- 238000012986 modification Methods 0.000 abstract description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 98
- 230000032683 aging Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- CPLASELWOOUNGW-UHFFFAOYSA-N benzyl(triethoxy)silane Chemical compound CCO[Si](OCC)(OCC)CC1=CC=CC=C1 CPLASELWOOUNGW-UHFFFAOYSA-N 0.000 description 3
- 239000013590 bulk material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010073 coating (rubber) Methods 0.000 description 1
- 230000001595 contractor effect Effects 0.000 description 1
- 239000012024 dehydrating agents Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/20—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents
- B22C1/22—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins
- B22C1/2233—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- B22C1/2246—Condensation polymers of aldehydes and ketones
- B22C1/2253—Condensation polymers of aldehydes and ketones with phenols
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/20—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
- B22C5/08—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by sprinkling, cooling, or drying
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mold Materials And Core Materials (AREA)
- Paints Or Removers (AREA)
Abstract
The invention relates to the technical field of precoated sand processing, in particular to a preparation process of high-temperature-resistant precoated sand, which comprises the following steps: the invention uses modification of sand body surface and coating of phenolic resin and silicon rubber to obviously improve high temperature stability of coated sand, so that castings prepared by the coated sand have better high temperature resistant effect and more stable performance under complex high temperature conditions.
Description
Technical Field
The invention relates to the technical field of precoated sand processing, in particular to a preparation process of high-temperature-resistant precoated sand.
Background
Precoated sand refers to sand or core sand having a layer of solid resin film on the sand surface prior to molding. As the precoated sand has the advantages of high strength, low gas generation, high dimensional accuracy of the produced castings, smooth surface, convenient preservation and the like, the precoated sand has increasingly wide application in recent years. However, the existing precoated sand cannot meet the requirements of the existing production. In the prior art, molybdenum modified high-ortho phenolic resin is mostly adopted as a binder, and a dehydrating agent, a curing agent and a lubricant are matched, so that the high-temperature resistance of the prepared high-temperature-resistant precoated sand is improved, and the normal-temperature bending strength reaches 6MPa. However, in practical application, the high-temperature stability of the high-temperature-resistant precoated sand in practical application is poor due to lack of targeted modification on the surface of the raw sand.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a preparation process of high-temperature-resistant precoated sand, which is used for improving the strength of the precoated sand and the service performance, and the specific technical scheme is as follows:
a preparation process of high-temperature-resistant precoated sand comprises the following steps:
(1) Surface treatment
Firstly, putting the raw sand into a sand mixer, heating to 160-170 ℃, preserving heat for 20-30min, spreading the raw sand to a thickness of 1-2cm, spraying dilute sulfuric acid on the surface of the raw sand, and spreading for 10-13min; heating to 80-100deg.C, preheating for 10-15min, continuously increasing the temperature to 180-190 deg.C, spreading out the raw sand again, spraying dilute sulfuric acid, washing the raw sand with clear water to neutral pH, and baking at 100-110deg.C for 1-2 hr;
(2) Raw sand surface filling
Cooling the raw sand obtained in the previous step to 25-28 ℃, adding aniline methyl triethoxysilane, stirring at 30-35 ℃ and 200-300r/min for 40-43min, treating with ultrasonic waves for 10-15min, and sealing and standing for 30-50min;
(3) Preparing a film forming liquid
Uniformly mixing silicon rubber and tetrahydrofuran according to the mass ratio of 1:15-20, adding calcium sulfate whisker accounting for 2-4% of the mass of the silicon rubber, mixing and stirring for 50-60min;
(4) Adsorption of raw sand surface
Mixing the membrane liquid and the raw sand treated in the step (2) according to the mass ratio of 1:58-65, adding N-phenyl-gamma-aminopropyl trimethoxysilane with the mass of 4-7% of that of the silicone rubber, stirring for 48-55min, and heating to 140-150 ℃ for curing;
(5) Raw sand resin coating film
Mixing and heating 1-3 parts by mass of boron phenolic resin, 4-8 parts by mass of molybdenum phenolic resin, 2-5 parts by mass of titanium phenolic resin and 200-300 parts by mass of acetone until the components are dissolved to obtain phenolic resin coating liquid, mixing the phenolic resin coating liquid with the solidified product obtained in the previous step for 1000-2000r/min, stirring for 30-50min, raising the temperature to 180-200 ℃, cooling and crushing.
Further, in the step (1), the spraying amount of the dilute sulfuric acid is 3-5% of the mass of the raw sand.
Further, in the step (1), the concentration of the dilute sulfuric acid is 0.03-0.07mol/L.
Further, in the step (1), the temperature of the dilute sulfuric acid is 3-5 ℃.
Further, in the step (1), the grain size of the raw sand is 100-200 meshes.
Further, in the step (2), the ultrasonic power is 800-900W.
Further, in the step (5), the mass ratio of the phenolic resin coating liquid to the cured product is 1:15-18.
Compared with the prior art, the invention has the technical effects that:
according to the invention, the surface of the sand is provided with a large number of scores by treating the raw sand at a high temperature and spraying low-temperature dilute sulfuric acid, and the etching effect of acid and the expansion and contraction effect of the sand body under a remarkable temperature difference are utilized, so that the roughness of the surface of the raw sand is improved, and the raw sand has a larger surface area. The sand body has a larger contact surface with silicon rubber, boron phenolic resin, molybdenum phenolic resin and titanium phenolic resin in the surface treatment. According to the invention, through fully mixing and adsorbing the sand body and the phenylmethyltriethoxysilane, in the treatment of the silicone rubber coating liquid, the concentrated adhesion of the silicone rubber on the surface of the sand body is promoted, the curing of the silicone rubber is promoted, and then the phenolic resin coating liquid is added for further curing and mixing, so that the surface of the sand body is covered with the phenolic resin to obtain complete coated sand, and the high-temperature stability of the coated sand is remarkably improved by utilizing the modification of the surface of the sand body and the coating of the phenolic resin and the silicone rubber, so that a casting prepared from the coated sand has a better high-temperature resistant effect and has more stable performance under complex high-temperature conditions.
Detailed Description
The technical scheme of the present invention is further defined below in conjunction with the specific embodiments, but the scope of the claimed invention is not limited to the description. The raw sand used in the examples below was quartz sand.
Example 1
A preparation process of high-temperature-resistant precoated sand comprises the following steps:
(1) Surface treatment
Firstly, putting raw sand into a sand mixer, heating to 160 ℃, preserving heat for 20min, pouring the raw sand into a bulk material field, spreading the raw sand to a thickness of 1cm, rapidly spraying dilute sulfuric acid on the surface of the raw sand, and spreading for 10min; collecting raw sand, placing the raw sand into a sand mixer, heating the raw sand to 80 ℃, preheating the raw sand for 10min, continuously raising the temperature to 180 ℃, pouring the raw sand into a bulk material field again, spreading the raw sand, spraying dilute sulfuric acid, cooling the raw sand to room temperature, flushing the raw sand to be neutral by clear water, and drying the raw sand at 100 ℃ for 1h;
each spraying amount of the dilute sulfuric acid is 3% of the mass of the raw sand, the concentration of the dilute sulfuric acid is 0.03mol/L, and the temperature of the dilute sulfuric acid is 3 ℃; the grain diameter of the raw sand is 100 meshes;
(2) Raw sand surface filling
Cooling the raw sand obtained in the previous step to 25 ℃, adding phenylmethyltriethoxysilane, stirring at 200r/min at 30 ℃ for 40min, treating with ultrasonic waves for 10min, and sealing and standing for 30min; the ultrasonic power is 800W;
(3) Preparing a film forming liquid
Uniformly mixing silicon rubber and tetrahydrofuran according to a mass ratio of 1:15, adding calcium sulfate whisker accounting for 2% of the mass of the silicon rubber, mixing and stirring for 50min;
(4) Adsorption of raw sand surface
Mixing the membrane liquid and the raw sand treated in the step (2) according to the mass ratio of 1:58, adding N-phenyl-gamma-aminopropyl trimethoxysilane accounting for 4% of the mass of the silicone rubber, stirring for 48min, and heating to 140 ℃ for curing;
(5) Raw sand resin coating film
Mixing and heating 1 part of boron phenolic resin, 4 parts of molybdenum phenolic resin, 2 parts of titanium phenolic resin and 200 parts of acetone by mass to dissolve to obtain phenolic resin coating liquid, mixing the phenolic resin coating liquid and the solidified product in the previous step for 1000r/min, stirring for 30min, heating to 180 ℃, cooling and crushing to obtain the phenolic resin coating liquid; the mass ratio of the phenolic resin coating liquid to the cured product is 1:15.
Example 2
A preparation process of high-temperature-resistant precoated sand comprises the following steps:
(1) Surface treatment
Firstly, putting the raw sand into a sand mixer, heating to 170 ℃, preserving heat for 30min, spreading the raw sand to a thickness of 2cm, spraying dilute sulfuric acid on the surface of the raw sand, and spreading for 13min; heating to 100deg.C, preheating for 15min, continuously increasing the temperature to 190 deg.C, spreading out the raw sand again, spraying dilute sulfuric acid, washing the raw sand with clear water to neutral pH, and baking at 110deg.C for 2 hr;
each spraying amount of the dilute sulfuric acid is 5% of the mass of the raw sand, the concentration of the dilute sulfuric acid is 0.07mol/L, and the temperature of the dilute sulfuric acid is 5 ℃; the grain diameter of the raw sand is 200 meshes;
(2) Raw sand surface filling
Cooling the raw sand obtained in the previous step to 28 ℃, adding aniline methyltriethoxysilane, stirring at 300r/min at 35 ℃ for 43min, treating with ultrasonic waves for 15min, and sealing and standing for 50min; the ultrasonic power is 900W;
(3) Preparing a film forming liquid
Uniformly mixing silicon rubber and tetrahydrofuran according to a mass ratio of 1:20, adding calcium sulfate whisker accounting for 4% of the mass of the silicon rubber, mixing and stirring for 60min;
(4) Adsorption of raw sand surface
Mixing the membrane liquid and the raw sand treated in the step (2) according to the mass ratio of 1:65, adding N-phenyl-gamma-aminopropyl trimethoxysilane with the mass of 7% of that of the silicone rubber, stirring for 55min, and heating to 150 ℃ for curing;
(5) Raw sand resin coating film
3 parts of boron phenolic resin, 8 parts of molybdenum phenolic resin, 5 parts of titanium phenolic resin and 300 parts of acetone are mixed and heated until the components are dissolved to obtain phenolic resin coating liquid, the phenolic resin coating liquid and the solidified product in the previous step are mixed for 2000r/min and stirred for 50min, the temperature is increased to 200 ℃, and the mixture is cooled and crushed to obtain the phenolic resin coating liquid; the mass ratio of the phenolic resin coating liquid to the cured product is 1:18.
Example 3
A preparation process of high-temperature-resistant precoated sand comprises the following steps:
(1) Surface treatment
Firstly, putting the raw sand into a sand mixer, heating to 165 ℃, preserving heat for 24min, spreading the raw sand to a thickness of 1cm, spraying dilute sulfuric acid on the surface of the raw sand, and spreading for 13min; heating to 100deg.C, preheating for 10min, continuously increasing the temperature to 190 deg.C, spreading out the raw sand again, spraying dilute sulfuric acid, washing the raw sand with clear water to neutral pH, and baking at 110deg.C for 1 hr;
each spraying amount of the dilute sulfuric acid is 5% of the mass of the raw sand, the concentration of the dilute sulfuric acid is 0.03mol/L, and the temperature of the dilute sulfuric acid is 5 ℃; the grain diameter of the raw sand is 100 meshes;
(2) Raw sand surface filling
Cooling the raw sand obtained in the previous step to 28 ℃, adding phenylmethyltriethoxysilane, stirring at 300r/min at 30 ℃ for 40min, treating with ultrasonic waves for 15min, and sealing and standing for 50min; the ultrasonic power is 800W;
(3) Preparing a film forming liquid
Uniformly mixing silicon rubber and tetrahydrofuran according to a mass ratio of 1:20, adding calcium sulfate whisker accounting for 2% of the mass of the silicon rubber, mixing and stirring for 60min;
(4) Adsorption of raw sand surface
Mixing the membrane liquid and the raw sand treated in the step (2) according to the mass ratio of 1:65, adding N-phenyl-gamma-aminopropyl trimethoxysilane accounting for 4% of the mass of the silicone rubber, stirring for 55min, and heating to 140 ℃ for curing;
(5) Raw sand resin coating film
3 parts of boron phenolic resin, 8 parts of molybdenum phenolic resin, 2 parts of titanium phenolic resin and 200 parts of acetone are mixed and heated until the components are dissolved to obtain phenolic resin coating liquid, the phenolic resin coating liquid and the solidified product in the previous step are mixed for 1000r/min and stirred for 50min, the temperature is increased to 200 ℃, and the mixture is cooled and crushed to obtain the phenolic resin coating liquid; the mass ratio of the phenolic resin coating liquid to the cured product is 1:15.
Comparative example setting:
test examples
Precoated sand was produced according to examples 1 to 3 and comparative examples 1 to 4, respectively, and the precoated sand was produced into a coated casting, and the performance parameters thereof were examined, and the coated casting was aged in an aging oven at 80℃and a humidity of 75% for 60 hours, and the performance parameters thereof were examined again.
As can be seen from the table, the tensile strength of the coated castings according to examples 1-3 of the method of the present invention is significantly higher than that of comparative examples 1-3, and it can be seen that the coated sand of the present application brings about good structural improvement and improves the performance of the coated castings.
Performance parameters after aging:
as shown in the table, after aging, the performance of examples 1-3 is basically equivalent to that of the performance parameters before aging, and the performance parameters of comparative examples 1-4 are obviously reduced by about 85% before aging, so that the film coated casting prepared by the method has excellent stability at high temperature and good aging resistance.
Claims (6)
1. The preparation process of the high-temperature-resistant precoated sand is characterized by comprising the following steps of:
(1) Surface treatment
Firstly, putting the raw sand into a sand mixer, heating to 160-170 ℃, preserving heat for 20-30min, spreading the raw sand to a thickness of 1-2cm, spraying dilute sulfuric acid on the surface of the raw sand, and spreading for 10-13min; heating to 80-100deg.C, preheating for 10-15min, continuously increasing the temperature to 180-190 deg.C, spreading out the raw sand again, spraying dilute sulfuric acid, washing the raw sand with clear water to neutral pH, and baking at 100-110deg.C for 1-2 hr; the temperature of the dilute sulfuric acid is 3-5 ℃;
(2) Raw sand surface filling
Cooling the raw sand obtained in the previous step to 25-28 ℃, adding aniline methyl triethoxysilane, stirring at 30-35 ℃ and 200-300r/min for 40-43min, treating with ultrasonic waves for 10-15min, and sealing and standing for 30-50min;
(3) Preparing a membrane solution
Uniformly mixing silicon rubber and tetrahydrofuran according to the mass ratio of 1:15-20, adding calcium sulfate whisker accounting for 2-4% of the mass of the silicon rubber, mixing and stirring for 50-60min;
(4) Adsorption of raw sand surface
Mixing the membrane liquid and the raw sand treated in the step (2) according to the mass ratio of 1:58-65, adding N-phenyl-gamma-aminopropyl trimethoxysilane with the mass of 4-7% of that of the silicone rubber, stirring for 48-55min, heating to 140-150 ℃ and curing to obtain a cured product;
(5) Raw sand resin coating film
Mixing and heating 1-3 parts by mass of boron phenolic resin, 4-8 parts by mass of molybdenum phenolic resin, 2-5 parts by mass of titanium phenolic resin and 200-300 parts by mass of acetone until the components are dissolved to obtain phenolic resin coating liquid, mixing the phenolic resin coating liquid with the solidified product obtained in the previous step for 1000-2000r/min, stirring for 30-50min, raising the temperature to 180-200 ℃, cooling and crushing.
2. The process for preparing high temperature resistant precoated sand as claimed in claim 1, wherein in the step (1), the spraying amount of the dilute sulfuric acid is 3 to 5% of the mass of the raw sand.
3. The process for producing high temperature resistant precoated sand as claimed in claim 1, wherein in the step (1), the concentration of the dilute sulfuric acid is 0.03 to 0.07mol/L.
4. The process for preparing high temperature resistant precoated sand as claimed in claim 1, wherein in the step (1), the raw sand has a particle size of 100 to 200 mesh.
5. The process for preparing high temperature resistant precoated sand as recited in claim 1, wherein in the step (2), the ultrasonic power is 800 to 900W.
6. The process for preparing high-temperature-resistant precoated sand as set forth in claim 1, wherein in the step (5), the mass ratio of the phenolic resin coating liquid to the cured product is 1:15-18.
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| CN104057021A (en) * | 2014-05-12 | 2014-09-24 | 安顺学院 | Preparing and painting methods of coating of metal mould casting and rising system |
| CN105801014A (en) * | 2016-03-17 | 2016-07-27 | 山东金麒麟股份有限公司 | Multielement silane coupling agent-modified phenolic resin base combined disc brake pad and preparation method thereof |
| CN106493285A (en) * | 2016-10-28 | 2017-03-15 | 东南大学 | A kind of method for improving precoated sand performance |
| CN106826591A (en) * | 2017-03-17 | 2017-06-13 | 衢州学院 | A kind of rubber resin combined binder grinding tool and preparation method thereof |
| CN108296477A (en) * | 2017-09-29 | 2018-07-20 | 柳州市柳晶科技股份有限公司 | A kind of 3D printing precoated sand and preparation method thereof |
| WO2019070051A1 (en) * | 2017-10-06 | 2019-04-11 | 旭有機材株式会社 | Mold material and manufacturing method therefor, mold and manufacturing method therefor, and molding sand regeneration method |
| CN110918867A (en) * | 2019-12-21 | 2020-03-27 | 青岛宜泰源铸造材料有限公司 | Special precoated sand for stainless steel and preparation process thereof |
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