CN114082888A - Low-cost environment-friendly water-soluble sand core mold and preparation method thereof - Google Patents
Low-cost environment-friendly water-soluble sand core mold and preparation method thereof Download PDFInfo
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- CN114082888A CN114082888A CN202111215332.8A CN202111215332A CN114082888A CN 114082888 A CN114082888 A CN 114082888A CN 202111215332 A CN202111215332 A CN 202111215332A CN 114082888 A CN114082888 A CN 114082888A
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- polyvinyl alcohol
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- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 58
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 58
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 30
- 239000004576 sand Substances 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000002156 mixing Methods 0.000 claims abstract description 20
- 239000000243 solution Substances 0.000 claims abstract description 17
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 15
- 238000011049 filling Methods 0.000 claims abstract description 12
- 239000007864 aqueous solution Substances 0.000 claims abstract description 11
- 239000000853 adhesive Substances 0.000 claims abstract description 10
- 230000001070 adhesive effect Effects 0.000 claims abstract description 10
- 239000011248 coating agent Substances 0.000 claims abstract description 3
- 238000000576 coating method Methods 0.000 claims abstract description 3
- 238000003756 stirring Methods 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 16
- 230000001680 brushing effect Effects 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 9
- 238000005303 weighing Methods 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 4
- 238000005056 compaction Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 238000003823 mortar mixing Methods 0.000 claims 1
- 230000006835 compression Effects 0.000 abstract description 14
- 238000007906 compression Methods 0.000 abstract description 14
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 88
- 239000006004 Quartz sand Substances 0.000 description 8
- 238000000465 moulding Methods 0.000 description 7
- 229920002379 silicone rubber Polymers 0.000 description 5
- 239000004945 silicone rubber Substances 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 5
- 239000010935 stainless steel Substances 0.000 description 5
- 239000008399 tap water Substances 0.000 description 5
- 235000020679 tap water Nutrition 0.000 description 5
- 230000006978 adaptation Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 208000028571 Occupational disease Diseases 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 239000000805 composite resin Substances 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
- B22C7/06—Core boxes
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses a low-cost environment-friendly water-soluble sand core mold and a preparation method thereof, wherein the water-soluble sand core mold comprises a base material and a water-soluble adhesive, the base material comprises river sand, the water-soluble adhesive comprises a polyvinyl alcohol aqueous solution, and the mass ratio of the river sand to the polyvinyl alcohol aqueous solution is (5-10): 1. The preparation method comprises the steps of coating release agent, preparing polyvinyl alcohol solution, mixing mortar, filling, curing and demolding; the water-soluble sand core mold has the average compression strength of 9.7-19.9 MPa at room temperature, the average compression strength of 3.6-7.5 MPa at 150 ℃, the average density of 1.66-1.75 g/cm3 and the dissolving time of 5-6 min in water at room temperature, and has the effects of reducing the production cost and improving the production efficiency and the product quality.
Description
Technical Field
The invention relates to the technical field of water-soluble sand core mold materials, in particular to a low-cost environment-friendly water-soluble sand core mold and a preparation method thereof.
Background
The water-soluble sand core mold has the advantages of high strength, high modulus, simple demolding, easy processing and the like, and is widely applied to the forming of the winding shell. The shell is formed by mixing and bonding a water-soluble adhesive and an inorganic material together according to a certain proportion and then adopting a proper process technology, and the shell is demoulded by a water-soluble method after the shell is formed. The water-soluble adhesive used at home and abroad mainly comprises polyvinyl alcohol and polyacrylate, and the filler mainly comprises expensive quartz sand, urea and the like. Zhang Fang et al (Zhang Fang, Yinyangxia, Tan Shi, Water-soluble core die performance and application research [ J ], aerospace manufacturing technology, 2012(6),53-60) prepared a water-soluble core die by using quartz sand as a base material, and the larger the grain size is, the better the mechanical properties are. Wangxingling et al (Wangxingling, Pailonglong, Licailin, Xijimin, research on the performance of a high-temperature-resistant water-soluble sand core mold for polymer-based composite materials [ J ], plastic industry, 2019,47(4), 105-doped sand 109) adopt quartz sand as a base material to prepare a low-cost easily-molded water-soluble core mold, and the core mold can meet the temperature requirement during molding of resin-based composite materials and can be removed by water dissolution after the molding of the composite materials is finished.
At present, the filler taking polyvinyl alcohol as an adhesive binder is mainly quartz sand, but the quartz sand is expensive and has poor economy in the batch production process, and on the other hand, the quartz sand system has the problems of large dust, poor demolding manufacturability and the like, and has great influence on the occupational health of field operators, so that an inorganic filler with lower cost is required to be found for manufacturing a water-soluble sand core mold with high mechanical property, so that the production cost is reduced, the production efficiency is improved, and the operation environment is improved.
Based on the situation, the invention provides a low-cost environment-friendly water-soluble sand core mold and a preparation method thereof, and the problems can be effectively solved.
Disclosure of Invention
In view of the above-mentioned problems of the prior art, the present invention providesThe sample prepared from the material has the average compression strength of 9.7-19.9 MPa at room temperature, the average compression strength of 3.6-7.5 MPa at 150 ℃ and the average density of 1.66-1.75 g/cm3And the dissolving time in room-temperature water is 5-6 min, so that the effects of reducing the production cost and improving the production efficiency and the product quality are achieved.
In order to solve the technical problems, the invention is realized by the following technical scheme:
in a first aspect, the invention provides a low-cost environment-friendly water-soluble sand core mold, which comprises a base material and a water-soluble adhesive, wherein the base material comprises river sand, the water-soluble adhesive comprises a polyvinyl alcohol aqueous solution, and the mass ratio of the river sand to the polyvinyl alcohol aqueous solution is (5-10): 1. If the ratio is lower than 5:1, the water content is too high, the flowability of the formed mortar mixed material in the sand core mold forming process is too high, and the mortar mixed material cannot be compacted; if the ratio is higher than 10:1, the water content is reduced, and meanwhile, the content of polyvinyl alcohol is reduced, so that the mixing of mortar is not uniform easily during stirring, holes are easily formed after the surface of the sand core model is trimmed, and the use of the sand core model is influenced. The optimum value is 7: 1.
Preferably, the mesh range of the river sand is 50-80 meshes. The mesh range is obtained according to the surface smoothness of the sand core mold, the strength of the sand core mold and the purchase cost, if the mesh is too small, the surface of the core mold is rough, the strength of the sand core mold is reduced, and if the mesh is too large, the purchase cost is higher.
Preferably, the mass fraction of the polyvinyl alcohol aqueous solution is in the range of 10% to 20%. If a larger mass fraction is chosen, the dissolution time is too long, affecting the efficiency, and if the mass fraction is too small, the emphasis is on a decrease, this data and is reflected in the examples.
In a second aspect, the present invention provides a method for preparing a low-cost environment-friendly water-soluble sand core mold, comprising:
brushing a release agent: uniformly coating a layer of release agent on the inner molded surface of the sand core mold forming tool, and curing at room temperature for a period of time for later use;
preparing a polyvinyl alcohol solution: weighing water and polyvinyl alcohol according to the designed mass fraction, pouring the water and the polyvinyl alcohol into a container, mechanically stirring the mixture in a water bath until the polyvinyl alcohol is completely dissolved, and then cooling the mixture to room temperature;
mixing mortar: pouring the dried river sand and the prepared polyvinyl alcohol aqueous solution into a sand mixer according to the designed mass ratio, and uniformly mixing and stirring;
filling and curing: pouring the uniformly mixed mortar into the sand core mold forming tool for compaction, filling the mortar to the end face of the opening of the forming tool, finally putting the mortar into a baking oven for heating and curing treatment, and cooling the mortar to room temperature along with the oven;
demolding: and (4) releasing the cooled sand core mold from the sand core mold forming tool to obtain the water-soluble sand core mold.
Preferably, in the step of preparing the polyvinyl alcohol solution, the mass ratio of water to polyvinyl alcohol is (4-9): 1.
Preferably, in the step of preparing the polyvinyl alcohol solution, the water bath temperature is 100 ℃.
Preferably, in the step of mixing the mortar, the mixing and stirring time is 20-30 min.
Preferably, in the step of filling and curing, the temperature in the oven is gradually increased from room temperature to 130 ℃, and the curing time is 20 hours.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. river sand which is not much different from quartz sand in number but only about 1/3 in price is selected as a base material, so that the production cost is reduced.
2. The natural river sand particles are more round than the quartz sand obtained by mechanical crushing, and the bonding area between the natural river sand particles and the water-soluble adhesive is larger, so that a compact high-strength core mold can be prepared under the condition of a smaller mesh number.
3. A sand core mould prepared from river sand does not generate a large amount of dust in the machining process, and the occupational disease hazard is reduced.
Detailed Description
In order to explain the invention more conveniently, the invention is further explained below with reference to the following examples, but without being limited thereto.
Example 1:
the low-cost environment-friendly water-soluble sand core mold is obtained by the following method:
(1) brushing a release agent: uniformly brushing a layer of room temperature vulcanized silicone rubber release agent on the inner molded surface of the sand core mold forming tool, and curing for more than 24 hours at room temperature;
(2) preparing a polyvinyl alcohol solution: according to the mass ratio of tap water: accurately weighing polyvinyl alcohol (5: 1), pouring the polyvinyl alcohol into a stainless steel barrel, mechanically stirring the polyvinyl alcohol in a water bath at 100 ℃ uniformly until the polyvinyl alcohol is completely dissolved, cooling the polyvinyl alcohol to room temperature, and storing the polyvinyl alcohol for later use;
(3) mixing mortar: pouring the dried 50-80-mesh river sand and the prepared polyvinyl alcohol solution into a mechanical sand mixer according to the mass ratio of 7:1, uniformly mixing, and stirring for 20 min;
(4) filling and curing: pouring the mixed mortar into the sand core mold forming tool, wherein the mixed mortar is required to be poured in batches, is pneumatically compacted in batches, is filled to the opening end face of the forming tool, is placed into an oven, is gradually heated to 130 ℃ from room temperature, is cured for 20 hours, and is cooled to room temperature along with the oven;
(5) demolding: and (4) releasing the cooled sand core mold from the sand core mold forming tool to obtain the water-soluble sand core mold.
The obtained water-soluble sand core molding machine was added to a compressed sample having a size of 40mm × 40mm × 62mm and a number of 5. The average compressive strength at room temperature was found to be 19.9MPa, the average compressive strength at 150 ℃ was found to be 7.5MPa, and the average density was found to be 1.75g/cm3The dissolving time in water at room temperature is 6 min.
Example 2:
the low-cost environment-friendly water-soluble sand core mold is obtained by the following method:
(1) brushing a release agent: uniformly brushing a layer of room temperature vulcanized silicone rubber release agent on the inner molded surface of the sand core mold forming tool, and curing for more than 24 hours at room temperature;
(2) preparing a polyvinyl alcohol solution: according to the mass ratio of tap water: accurately weighing polyvinyl alcohol (6: 1), pouring into a stainless steel barrel, mechanically stirring uniformly in a water bath at 100 ℃ until the polyvinyl alcohol is completely dissolved, cooling to room temperature, and storing for later use;
(3) mixing mortar: and pouring the dried 50-80-mesh river sand and the prepared polyvinyl alcohol solution into a mechanical sand mixer according to the mass ratio of 7:1, uniformly mixing, and stirring for 20 min.
(4) Filling and curing: pouring the mixed mortar into the sand core mold forming tool, wherein the mixed mortar is required to be poured in batches, is pneumatically compacted in batches, is filled to the opening end face of the forming tool, is placed into an oven, is gradually heated to 130 ℃ from room temperature, is cured for 20 hours, and is cooled to room temperature along with the oven;
(5) demolding: and (4) releasing the cooled sand core mold from the sand core mold forming tool to obtain the water-soluble sand core mold.
The obtained water-soluble sand core molding machine was added to a compressed sample having a size of 40mm × 40mm × 62mm and a number of 5. The average compression strength at room temperature was found to be 15.8MPa, the average compression strength at 150 ℃ was found to be 5.6MPa, and the average density was found to be 1.70g/cm3The dissolving time in water at room temperature is 6 min.
Example 3:
the low-cost environment-friendly water-soluble sand core mold is obtained by the following method:
(1) brushing a release agent: uniformly brushing a layer of room temperature vulcanized silicone rubber release agent on the inner molded surface of the sand core mold forming tool, and curing for more than 24 hours at room temperature;
(2) preparing a polyvinyl alcohol solution: according to the mass ratio of tap water: accurately weighing polyvinyl alcohol (4: 1), pouring the polyvinyl alcohol into a stainless steel barrel, mechanically stirring the polyvinyl alcohol in a water bath at 100 ℃ uniformly until the polyvinyl alcohol is completely dissolved, cooling the polyvinyl alcohol to room temperature, and storing the polyvinyl alcohol for later use;
(3) mixing mortar: pouring the dried 50-80-mesh river sand and the prepared polyvinyl alcohol solution into a mechanical sand mixer according to the mass ratio of 5:1, uniformly mixing, and stirring for 30 min;
(4) filling and curing: pouring the mixed mortar into the sand core mold forming tool, wherein the mixed mortar is required to be poured in batches, is pneumatically compacted in batches, is filled to the opening end face of the forming tool, is placed into an oven, is gradually heated to 130 ℃ from room temperature, is cured for 20 hours, and is cooled to room temperature along with the oven;
(5) demolding: and (4) releasing the cooled sand core mold from the sand core mold forming tool to obtain the water-soluble sand core mold.
The obtained water-soluble sand core molding machine was added to a compressed sample having a size of 40mm × 40mm × 62mm and a number of 5. The average compression strength at room temperature was found to be 10.4MPa, the average compression strength at 150 ℃ was found to be 4.6MPa, and the average density was found to be 1.66g/cm3And the dissolving time in water at room temperature is 5 min.
Example 4:
the low-cost environment-friendly water-soluble sand core mold is obtained by the following method:
(1) brushing a release agent: uniformly brushing a layer of room temperature vulcanized silicone rubber release agent on the inner molded surface of the sand core mold forming tool, and curing for more than 24 hours at room temperature;
(2) preparing a polyvinyl alcohol solution: according to the mass ratio of tap water: accurately weighing polyvinyl alcohol (9: 1), pouring into a stainless steel barrel, mechanically stirring uniformly in a water bath at 100 ℃ until the polyvinyl alcohol is completely dissolved, cooling to room temperature, and storing for later use;
(3) mixing mortar: pouring the dried 50-80-mesh river sand and the prepared polyvinyl alcohol solution into a mechanical sand mixer according to the mass ratio of 10:1, uniformly mixing, and stirring for 25 min;
(4) filling and curing: pouring the mixed mortar into the sand core mold forming tool, wherein the mixed mortar is required to be poured in batches, is pneumatically compacted in batches, is filled to the opening end face of the forming tool, is placed into an oven, is gradually heated to 130 ℃ from room temperature, is cured for 20 hours, and is cooled to room temperature along with the oven;
(5) demolding: and (4) releasing the cooled sand core mold from the sand core mold forming tool to obtain the water-soluble sand core mold.
The obtained water-soluble sand core molding machine was added to a compressed sample having a size of 40mm × 40mm × 62mm and a number of 5. The average compression strength at room temperature was found to be 9.7MPa, the average compression strength at 150 ℃ was found to be 3.8MPa, and the average density was found to be 1.68g/cm3And the dissolving time in water at room temperature is 5 min.
Example 5:
the low-cost environment-friendly water-soluble sand core mold is obtained by the following method:
(1) brushing a release agent: uniformly brushing a layer of room temperature vulcanized silicone rubber release agent on the inner molded surface of the sand core mold forming tool, and curing for more than 24 hours at room temperature;
(2) preparing a polyvinyl alcohol solution: according to the mass ratio of tap water: accurately weighing polyvinyl alcohol (6: 1), pouring into a stainless steel barrel, mechanically stirring uniformly in a water bath at 100 ℃ until the polyvinyl alcohol is completely dissolved, cooling to room temperature, and storing for later use;
(3) mixing mortar: pouring the dried 50-80-mesh river sand and the prepared polyvinyl alcohol solution into a mechanical sand mixer according to the mass ratio of 5:1, uniformly mixing, and stirring for 25 min;
(4) filling and curing: pouring the mixed mortar into the sand core mold forming tool, wherein the mixed mortar is required to be poured in batches, is pneumatically compacted in batches, is filled to the opening end face of the forming tool, is placed into an oven, is gradually heated to 130 ℃ from room temperature, is cured for 20 hours, and is cooled to room temperature along with the oven;
(5) demolding: and (4) releasing the cooled sand core mold from the sand core mold forming tool to obtain the water-soluble sand core mold.
The obtained water-soluble sand core molding machine was added to a compressed sample having a size of 40mm × 40mm × 62mm and a number of 5. The average compression strength at room temperature was found to be 10.1MPa, the average compression strength at 150 ℃ was found to be 3.6MPa, and the average density was found to be 1.69g/cm3And the dissolving time in water at room temperature is 5 min.
In the above examples 1 to 5, PVA-1788 was selected as the polyvinyl alcohol, and the maximum solubility in water of 60 degrees or more was 380g/L, and the mass fraction was 27.5%.
Comparative example:
the average compression strength at room temperature of a quartz sand core mold sample prepared by adopting the masan et al (light structure sand core mold forming method, CN112405959A) was 12.3MPa, the average compression strength at 150 ℃ was 5.8MPa, and the average density was 1.64g/cm3When dissolved in water at room temperatureThe time interval is 21 min.
As can be seen from the above examples 1 to 5 and comparative examples, the samples made of the material of the present invention had an average compressive strength of 9.7 to 19.9MPa at room temperature, an average compressive strength of 3.6 to 7.5MPa at 150 ℃ and an average density of 1.66 to 1.75g/cm3The dissolving time in water at room temperature is 5-6 min, and various performances of the sand core mold can reach the effect equivalent to or even superior to that of a quartz sand core mold, so that the effects of reducing the production cost and improving the production efficiency and the product quality are achieved.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.
Claims (9)
1. A low-cost environment-friendly water-soluble sand core mold comprises a base material and a water-soluble adhesive, and is characterized in that: the base material comprises river sand, the water-soluble adhesive comprises a polyvinyl alcohol aqueous solution, and the mass ratio of the river sand to the polyvinyl alcohol aqueous solution is (5-10): 1.
2. The low-cost environment-friendly water-soluble sand core mold according to claim 1, characterized in that: the mass ratio of the river sand to the polyvinyl alcohol aqueous solution is 7: 1.
3. The low-cost environment-friendly water-soluble sand core mold according to claim 1, characterized in that: the mesh range of the river sand is 50-80 meshes.
4. The low-cost environment-friendly water-soluble sand core mold according to claim 1, characterized in that: the mass fraction range of the polyvinyl alcohol aqueous solution is 10-20%.
5. A method for preparing the low-cost environment-friendly water-soluble sand core mold as claimed in any one of claims 1 to 4, wherein the preparation method comprises the following steps:
brushing a release agent: uniformly coating a layer of release agent on the inner molded surface of the sand core mold forming tool, and curing at room temperature for a period of time for later use;
preparing a polyvinyl alcohol solution: weighing water and polyvinyl alcohol according to the designed mass fraction, pouring the water and the polyvinyl alcohol into a container, mechanically stirring the mixture in a water bath until the polyvinyl alcohol is completely dissolved, and then cooling the mixture to room temperature;
mixing mortar: pouring the dried river sand and the prepared polyvinyl alcohol aqueous solution into a sand mixer according to the designed mass ratio, and uniformly mixing and stirring;
filling and curing: pouring the uniformly mixed mortar into the sand core mold forming tool for compaction, filling the mortar to the end face of the opening of the forming tool, finally putting the mortar into a baking oven for heating and curing treatment, and cooling the mortar to room temperature along with the oven;
demolding: and (4) releasing the cooled sand core mold from the sand core mold forming tool to obtain the water-soluble sand core mold.
6. The method for preparing the low-cost environment-friendly water-soluble sand core mold according to claim 5, is characterized in that: in the preparation step of the polyvinyl alcohol solution, the mass ratio of water to polyvinyl alcohol is (4-9): 1.
7. The method for preparing the low-cost environment-friendly water-soluble sand core mold according to claim 5, is characterized in that: in the preparation step of the polyvinyl alcohol solution, the water bath temperature is 100 ℃.
8. The method for preparing the low-cost environment-friendly water-soluble sand core mold according to claim 5, is characterized in that: in the mortar mixing step, the mixing and stirring time is 20-30 min.
9. The method for preparing the low-cost environment-friendly water-soluble sand core mold according to claim 5, is characterized in that: in the filling and curing steps, the temperature in the oven is gradually increased from room temperature to 130 ℃, and the curing time is 20 hours.
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