CN113263133A - Easily-collapsible precoated sand and preparation method thereof - Google Patents
Easily-collapsible precoated sand and preparation method thereof Download PDFInfo
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- CN113263133A CN113263133A CN202110495993.4A CN202110495993A CN113263133A CN 113263133 A CN113263133 A CN 113263133A CN 202110495993 A CN202110495993 A CN 202110495993A CN 113263133 A CN113263133 A CN 113263133A
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- 239000004576 sand Substances 0.000 title claims abstract description 106
- 238000002360 preparation method Methods 0.000 title abstract description 19
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 claims abstract description 80
- VKJKEPKFPUWCAS-UHFFFAOYSA-M potassium chlorate Chemical compound [K+].[O-]Cl(=O)=O VKJKEPKFPUWCAS-UHFFFAOYSA-M 0.000 claims abstract description 48
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 claims abstract description 24
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 claims abstract description 21
- 235000013539 calcium stearate Nutrition 0.000 claims abstract description 21
- 239000008116 calcium stearate Substances 0.000 claims abstract description 21
- 229920005989 resin Polymers 0.000 claims abstract description 20
- 239000011347 resin Substances 0.000 claims abstract description 20
- 239000007864 aqueous solution Substances 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 239000002270 dispersing agent Substances 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims description 52
- 238000003756 stirring Methods 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 20
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 15
- 239000005011 phenolic resin Substances 0.000 claims description 15
- 229920001568 phenolic resin Polymers 0.000 claims description 15
- 239000000243 solution Substances 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 99
- 238000005266 casting Methods 0.000 description 21
- 239000000203 mixture Substances 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 9
- 229910052760 oxygen Inorganic materials 0.000 description 9
- 239000001301 oxygen Substances 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 238000012216 screening Methods 0.000 description 8
- 229910000838 Al alloy Inorganic materials 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 4
- 229930185605 Bisphenol Natural products 0.000 description 3
- -1 bisphenol amine Chemical class 0.000 description 3
- CMLFRMDBDNHMRA-UHFFFAOYSA-N 2h-1,2-benzoxazine Chemical compound C1=CC=C2C=CNOC2=C1 CMLFRMDBDNHMRA-UHFFFAOYSA-N 0.000 description 2
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007849 furan resin Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010622 cold drawing Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910021652 non-ferrous alloy Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 210000002489 tectorial membrane Anatomy 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 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
- B22C1/02—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by additives for special purposes, e.g. indicators, breakdown additives
Abstract
The invention relates to the field of precoated sand, in particular to easily collapsible precoated sand and a preparation method thereof. The precoated sand comprises the following raw materials in parts by mass: 1000 parts of raw sand, 10-16 parts of low-melting-point high-polymerization-rate resin, 1.5-2.5 parts of urotropine aqueous solution, 0.7-1.1 parts of calcium stearate and 1-3 parts of a dispersing agent, wherein the dispersing agent comprises potassium chlorate and manganese dioxide, and the mass ratio of the manganese dioxide to the potassium chlorate is 0.1-0.2. According to the invention, by reasonably controlling the usage proportion of manganese dioxide and potassium chlorate, the collapsibility of the precoated sand is improved under the condition of not influencing the strength of the precoated sand.
Description
Technical Field
The invention relates to the field of precoated sand, in particular to easily collapsible precoated sand and a preparation method thereof.
Background
Along with the increase of the demand of aluminum alloy castings, the shapes of the castings are more complicated, and correspondingly higher requirements are put forward for the coated sand for casting. At present, hot-box furan resin sand, cold-box sand and common precoated sand are generally adopted for producing complex aluminum alloy castings. Although the preparation process of the furan resin sand is mature and simple, the fluidity, the surface compactness of the sand core and the collapsibility of the sand core are poor, so that the surface roughness and the precision of the casting are poor, and the complex aluminum casting is difficult to produce. Although the cold-box sand has high production efficiency and high dimensional precision of a core box, the cold-box sand has low strength, poor storability, high cost and general collapsibility and is difficult to adapt to complex castings.
When the common precoated sand is used for producing steel castings and some special iron castings (thick-wall thin-core castings) as sand cores, cracks generated by the sand cores are often found after casting, sometimes even the sand cores are broken, and orange peel defects are formed on the surfaces of the castings. The benzoxazine resin is carbonized, burned and decomposed at high temperature after the sand core is contacted with high-temperature molten metal, the strength of the benzoxazine resin is reduced, the silica sand generates larger phase change volume expansion, and the sand core is damaged under the action of the rapid thermal expansion of the sand core. When the pouring temperature is too high and the mass of molten iron is relatively large, the sand mold may even have core penetration, which results in casting scrap. In addition, when the sand core is completely surrounded by molten iron, the sand core may become soft, and deform under the buoyancy of the molten iron, so that the size of the casting changes, and the casting is seriously scrapped. Therefore, the high-temperature resistant precoated sand is a variety which needs to be developed urgently in production. The easy-to-collapse precoated sand is developed aiming at the difficulty in sand removal of nonferrous metal (particularly aluminum alloy) castings. The casting is used for producing non-ferrous alloy (aluminum alloy, copper alloy and the like) castings, sand removal is not needed by reheating the castings, and sand shakeout can be carried out by only cooling the cast castings for a period of time. The common precoated sand has relatively high strength, but the aluminum alloy casting temperature is low, the thermal decomposition temperature of the phenolic resin is relatively high, and the collapsibility of the precoated sand is poor.
Disclosure of Invention
In order to solve the problems, the invention provides the easily collapsible precoated sand and the preparation method thereof, the easily collapsible precoated sand is prepared by adopting potassium chlorate and manganese dioxide as collapsing agents, and the specific technical scheme is as follows:
the easy-collapsibility precoated sand comprises the following raw materials in parts by mass: 1000 parts of raw sand, 10-16 parts of low-melting-point high-polymerization-rate resin, 1.5-2.5 parts of urotropine aqueous solution, 0.7-1.1 parts of calcium stearate and 1-3 parts of a dispersing agent, wherein the dispersing agent comprises potassium chlorate and manganese dioxide.
As a preferable embodiment of the easily collapsible precoated sand, the mass ratio of the manganese dioxide to the potassium chlorate is 0.1-0.2.
As a preferable embodiment of the easily collapsible precoated sand, the mass concentration of the urotropine aqueous solution is 30-40%.
As a preferred embodiment of the easily collapsible precoated sand of the present invention, the raw sand includes one or both of baked sand and reclaimed sand.
As a preferred embodiment of the easily collapsible precoated sand, the low-melting-point high-polymerization-speed resin comprises one or more of phenolic resin and bisphenol amine resin.
The invention also provides a preparation method of the easily collapsible precoated sand, which comprises the following steps:
(1) heating and stirring the raw sand;
(2) adding low-melting-point high-polymerization-speed resin, and mixing for 25-35s until the mixture is uniform;
(3) adding potassium chlorate and manganese dioxide, and mixing for 15-25s until uniform;
(4) adding urotropine water solution, and mixing for 30-50s to obtain a uniform mixture;
(5) adding calcium stearate, and mixing for 15-35s until uniform;
(6) taking out, cooling and crushing to obtain the product.
As a preferred embodiment of the preparation method of the easily collapsible precoated sand, the heating temperature of the mixing mill is 130-150 ℃.
As a preferred embodiment of the preparation method of the easily collapsible precoated sand, the stirring speed of the mixing mill is 50-150 r/min.
The easily collapsible precoated sand and the preparation method thereof have the following beneficial effects:
(1) manganese dioxide is added as a catalyst to promote potassium chlorate to play a collapsibility role, and the easily collapsible precoated sand is prepared. Potassium chlorate is heated to decompose at about 550 ℃ to release oxygen, the requirement on temperature is high when the potassium chlorate is independently used as a collapsint, but in the presence of manganese dioxide, the potassium chlorate can decompose the oxygen at 400 ℃, so that the combustion of resin in the sand core is assisted, and the collapsibility of the precoated sand is improved.
(2) According to the invention, the oxygen release of potassium chlorate is controlled by reasonably proportioning the use amounts of manganese dioxide and potassium chlorate, and the collapsibility of the precoated sand is improved without influencing the strength of the precoated sand.
(3) The invention adds the curing agent urotropine solution, so that the resin and the raw sand are connected in a key connection mode in the stirring process, the conventional coating connection mode between the raw sand and the resin is changed, the bonding point strength of the raw sand and the resin is enhanced, and the mechanical strength of the precoated sand is greatly improved.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to specific embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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
The easily-collapsible precoated sand comprises the following raw materials in parts by mass: 1000 parts of dried sand, 14 parts of phenolic resin, 2 parts of a urotropine aqueous solution with the mass concentration of 33%, 1 part of calcium stearate, 2 parts of potassium chlorate and 0.1 part of manganese dioxide and the mass ratio of the manganese dioxide to the potassium chlorate.
The preparation method of the easily collapsible precoated sand comprises the following steps:
(1) heating and stirring raw sand by using a mixing roll, continuously stirring at a rotating speed of 100r/min, and heating to 130 ℃ to maintain constant temperature;
(2) adding phenolic resin, and mixing for 30s until the mixture is uniform;
(3) adding potassium chlorate and manganese dioxide, and mixing for 20s until uniform;
(4) adding urotropine water solution, and mixing for 40s to obtain a uniform mixture;
(5) adding calcium stearate, and mixing for 20s until uniform;
(6) taking out of the pot, cooling to below 40 ℃, crushing and screening to obtain the product.
Example 2
The easily-collapsible precoated sand comprises the following raw materials in parts by mass: 1000 parts of dried sand, 10 parts of bisphenol amine resin, 1.5 parts of urotropine aqueous solution with the mass concentration of 33%, 0.7 part of calcium stearate, 1 part of potassium chlorate and 0.2 part of manganese dioxide and the mass ratio of manganese dioxide to potassium chlorate.
The preparation method of the easily collapsible precoated sand comprises the following steps:
(1) heating and stirring raw sand by using a mixing roll, continuously stirring at a rotating speed of 100r/min, and heating to 140 ℃ to maintain constant temperature;
(2) adding bisphenol amine resin, and mixing for 25s until uniform;
(3) adding potassium chlorate and manganese dioxide, and mixing for 15s until uniform;
(4) adding urotropine water solution, and mixing for 30s until uniform;
(5) adding calcium stearate, and mixing for 15s until uniform;
(6) taking out of the pot, cooling to below 40 ℃, crushing and screening to obtain the product.
Example 3
The easily-collapsible precoated sand comprises the following raw materials in parts by mass: 1000 parts of dried sand, 16 parts of phenolic resin, 2.5 parts of urotropine aqueous solution with the mass concentration of 30%, 1.1 parts of calcium stearate, 2.5 parts of potassium chlorate and 0.2 part of manganese dioxide and the mass ratio of manganese dioxide to potassium chlorate.
The preparation method of the easily collapsible precoated sand comprises the following steps:
(1) heating and stirring raw sand by using a mixing roll, continuously stirring at a rotating speed of 150r/min, heating to 150 ℃, and maintaining constant temperature;
(2) adding phenolic resin, and mixing for 35s until the mixture is uniform;
(3) adding potassium chlorate and manganese dioxide, and mixing for 25s until uniform;
(4) adding urotropine water solution, and mixing for 50s to obtain a mixture;
(5) adding calcium stearate, and mixing for 35s until uniform;
(6) taking out of the pot, cooling to below 40 ℃, crushing and screening to obtain the product.
Example 4
The easily-collapsible precoated sand comprises the following raw materials in parts by mass: 1000 parts of dried sand, 15 parts of phenolic resin, 2.5 parts of urotropine aqueous solution with the mass concentration of 33%, 0.8 part of calcium stearate, 2 parts of potassium chlorate and 0.15 part of manganese dioxide and the mass ratio of manganese dioxide to potassium chlorate.
The preparation method of the easily collapsible precoated sand comprises the following steps:
(1) heating and stirring raw sand by using a mixing roll, continuously stirring at a rotating speed of 50r/min, heating to 150 ℃, and maintaining the constant temperature;
(2) adding low-melting-point high-polymerization-speed resin, and mixing for 35s until the mixture is uniform;
(3) adding potassium chlorate and manganese dioxide, and mixing for 25s until uniform;
(4) adding urotropine water solution, and mixing for 50s to obtain a mixture;
(5) adding calcium stearate, and mixing for 35s until uniform;
(6) taking out of the pot, cooling to below 40 ℃, crushing and screening to obtain the product.
Example 5
The easily-collapsible precoated sand comprises the following raw materials in parts by mass: 1000 parts of dried sand, 12 parts of phenolic resin, 2 parts of a urotropine aqueous solution with the mass concentration of 33%, 0.8 part of calcium stearate, 1 part of potassium chlorate and 0.1 part of manganese dioxide and the mass ratio of the manganese dioxide to the potassium chlorate.
The preparation method of the easily collapsible precoated sand comprises the following steps:
(1) heating and stirring the raw sand by a mixing roll, continuously stirring at a rotating speed of 120r/min, and heating to 140 ℃ to maintain constant temperature;
(2) adding low-melting-point high-polymerization-speed resin, and mixing for 35s until the mixture is uniform;
(3) adding potassium chlorate and manganese dioxide, and mixing for 25s until uniform;
(4) adding urotropine water solution, and mixing for 50s to obtain a mixture;
(5) adding calcium stearate, and mixing for 35s until uniform;
(6) taking out of the pot, cooling to below 40 ℃, crushing and screening to obtain the product.
Comparative example 1
The only difference compared with example 1 is that this comparative example has no manganese dioxide, other raw materials and the preparation method is the same as example 1, which is as follows:
the easily-collapsible precoated sand comprises the following raw materials in parts by mass: 1000 parts of dried sand, 14 parts of phenolic resin, 2 parts of a urotropine aqueous solution with the mass concentration of 33%, 1 part of calcium stearate and 2 parts of potassium chlorate.
The preparation method of the easily collapsible precoated sand comprises the following steps:
(1) heating and stirring raw sand by using a mixing roll, continuously stirring at a rotating speed of 100r/min, and heating to 130 ℃ to maintain constant temperature;
(2) adding phenolic resin, and mixing for 30s until the mixture is uniform;
(3) adding potassium chlorate, and mixing for 20s until uniform;
(4) adding urotropine water solution, and mixing for 40s to obtain a uniform mixture;
(5) adding calcium stearate, and mixing for 20s until uniform;
(6) taking out of the pot, cooling to below 40 ℃, crushing and screening to obtain the product.
Comparative example 2
The only difference compared with example 1 is that the mass ratio of manganese dioxide to potassium chlorate of this comparative example is 0.05.
The method comprises the following specific steps:
the easily-collapsible precoated sand comprises the following raw materials in parts by mass: 1000 parts of dried sand, 14 parts of phenolic resin, 2 parts of a urotropine aqueous solution with the mass concentration of 33%, 1 part of calcium stearate, 2 parts of potassium chlorate and 0.05 mass ratio of manganese dioxide to potassium chlorate.
The preparation method of the easily collapsible precoated sand comprises the following steps:
(1) heating and stirring raw sand by using a mixing roll, continuously stirring at a rotating speed of 100r/min, and heating to 130 ℃ to maintain constant temperature;
(2) adding phenolic resin, and mixing for 30s until the mixture is uniform;
(3) adding potassium chlorate and manganese dioxide, and mixing for 20s until uniform;
(4) adding urotropine water solution, and mixing for 40s to obtain a uniform mixture;
(5) adding calcium stearate, and mixing for 20s until uniform;
(6) taking out of the pot, cooling to below 40 ℃, crushing and screening to obtain the product.
Comparative example 3
The only difference compared with example 1 is that the mass ratio of manganese dioxide to potassium chlorate of this comparative example is 0.4.
The method comprises the following specific steps:
the easily-collapsible precoated sand comprises the following raw materials in parts by mass: 1000 parts of dried sand, 14 parts of phenolic resin, 2 parts of a urotropine aqueous solution with the mass concentration of 33%, 1 part of calcium stearate, 2 parts of potassium chlorate and 0.4 mass ratio of manganese dioxide to potassium chlorate.
The preparation method of the easily collapsible precoated sand comprises the following steps:
(1) heating and stirring raw sand by using a mixing roll, continuously stirring at a rotating speed of 100r/min, and heating to 130 ℃ to maintain constant temperature;
(2) adding phenolic resin, and mixing for 30s until the mixture is uniform;
(3) adding potassium chlorate and manganese dioxide, and mixing for 20s until uniform;
(4) adding urotropine water solution, and mixing for 40s to obtain a uniform mixture;
(5) adding calcium stearate, and mixing for 20s until uniform;
(6) taking out of the pot, cooling to below 40 ℃, crushing and screening to obtain the product.
The results of testing the easily collapsible precoated sand prepared in the above examples and comparative examples are shown in the following table:
| group of | Collapsibility | Bending strength | Cold tensile strength |
| Example 1 | 46.1％ | 5.7Mpa | 2.8Mpa |
| Example 2 | 48.2％ | 4.6Mpa | 2.0Mpa |
| Example 3 | 45.6％ | 6.5Mpa | 3.2Mpa |
| Example 4 | 47.5％ | 6.0Mpa | 2.9Mpa |
| Example 5 | 47.2％ | 5.0Mpa | 2.4Mpa |
| Comparative example 1 | 20.1％ | 6.4Mpa | 3.0Mpa |
| Comparative example 2 | 35.8％ | 6.2MPa | 2.9Mpa |
| Comparative example 3 | 50.1％ | 4.0Mpa | 1.8Mpa |
As is clear from the results of the tests in the tables, the collapsibility of the easily collapsible precoated sand prepared in examples 1 to 5 was not less than 45%, the flexural strength was not less than 4.5MPa, and the cold tensile strength was not less than 2.0 MPa. Therefore, the easily collapsible precoated sand prepared by the invention has good collapsibility and high mechanical strength.
As can be seen from comparative example 1, the addition of manganese dioxide promotes potassium chlorate to exert collapsibility, and improves collapsibility of the precoated sand. Because manganese dioxide and potassium chlorate can take place the chemical reaction, reduced potassium chlorate and heated the temperature requirement of releasing oxygen, can release more to oxygen oxidation resin under certain temperature, promote the collapsibility of tectorial membrane sand.
From comparative examples 2 and 3, it is understood that when the amount of manganese dioxide is relatively low, the catalytic effect on the release of oxygen from potassium chloride is limited, and collapsibility is inferior as compared with example 1. When the usage amount of manganese dioxide is too high, more oxygen is released by potassium chlorate at each temperature stage, the oxygen is decomposed and released by the potassium chlorate at the core making stage of the coated sand, the bending strength and the cold-drawing strength of the coated sand are reduced by the oxygen released in advance, and the potassium chlorate serving as the dispersing agent is also failed due to the advanced decomposition, so that the using effect of the coated sand is influenced. Therefore, the method reasonably controls the dosage proportion of manganese dioxide and potassium chlorate, and is the key for simultaneously improving collapsibility and mechanical strength of the precoated sand and ensuring the using effect of the precoated sand.
Claims (8)
1. The easy-collapsibility precoated sand is characterized by comprising the following raw materials in parts by mass: 1000 parts of raw sand, 10-16 parts of low-melting-point high-polymerization-rate resin, 1.5-2.5 parts of urotropine aqueous solution, 0.7-1.1 parts of calcium stearate and 1-3 parts of a dispersing agent, wherein the dispersing agent comprises potassium chlorate and manganese dioxide.
2. The collapsible precoated sand according to claim 1, wherein the mass ratio of manganese dioxide to potassium chlorate is 0.1-0.2.
3. The easily collapsible precoated sand according to claim 1, wherein the mass concentration of the urotropine aqueous solution is 30-40%.
4. The collapsible precoated sand of claim 1, wherein the raw sand comprises one or both of dried sand and reclaimed sand.
5. The collapsible precoated sand of claim 1, wherein the low-melting point high-polymerization-rate resin comprises a phenolic resin or a bisphenol-amine resin.
6. A method for preparing the easily collapsible precoated sand according to any one of claims 1 to 5, comprising the steps of:
(1) heating and stirring raw sand by using a mixing roll;
(2) adding low-melting-point high-polymerization-speed resin, and uniformly mixing;
(3) adding potassium chlorate and manganese dioxide, and mixing uniformly;
(4) adding urotropine water solution, and mixing;
(5) adding calcium stearate, and mixing uniformly;
(6) cooling and crushing to obtain the product.
7. The method for preparing collapsible precoated sand according to claim 6, wherein the heating temperature of the mixing roll is 130-150 ℃.
8. The method for preparing easily collapsible precoated sand according to claim 6, wherein the stirring speed of the mixer is 50 to 150 r/min.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112296248A (en) * | 2020-11-03 | 2021-02-02 | 重庆长江造型材料（集团）股份有限公司 | Easily-collapsible precoated sand and preparation method thereof |
| CN114799038A (en) * | 2022-05-26 | 2022-07-29 | 南阳仁创砂业科技有限公司 | Easily-collapsible precoated sand and preparation method thereof |
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| CN114799038A (en) * | 2022-05-26 | 2022-07-29 | 南阳仁创砂业科技有限公司 | Easily-collapsible precoated sand and preparation method thereof |
| CN114799038B (en) * | 2022-05-26 | 2023-11-10 | 南阳仁创砂业科技有限公司 | Easily-collapsable precoated sand and preparation method thereof |
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