CN103521676A - High-temperature-resistant easy-collapsibility precoated sand for casting - Google Patents
High-temperature-resistant easy-collapsibility precoated sand for casting Download PDFInfo
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- CN103521676A CN103521676A CN201310469475.0A CN201310469475A CN103521676A CN 103521676 A CN103521676 A CN 103521676A CN 201310469475 A CN201310469475 A CN 201310469475A CN 103521676 A CN103521676 A CN 103521676A
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- precoated sand
- casting
- sand
- cupric sulfate
- high temperature
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- 239000004576 sand Substances 0.000 title claims abstract description 89
- 238000005266 casting Methods 0.000 title claims abstract description 29
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims abstract description 38
- 239000005011 phenolic resin Substances 0.000 claims abstract description 25
- 229920001568 phenolic resin Polymers 0.000 claims abstract description 25
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 claims abstract description 23
- 239000008116 calcium stearate Substances 0.000 claims abstract description 23
- 235000013539 calcium stearate Nutrition 0.000 claims abstract description 23
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000002360 preparation method Methods 0.000 claims abstract description 13
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910000366 copper(II) sulfate Inorganic materials 0.000 claims description 36
- 235000010299 hexamethylene tetramine Nutrition 0.000 claims description 17
- 229960004011 methenamine Drugs 0.000 claims description 17
- -1 2~2.5 parts Substances 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 230000008020 evaporation Effects 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 11
- 238000000354 decomposition reaction Methods 0.000 abstract description 10
- 229910000365 copper sulfate Inorganic materials 0.000 abstract 2
- 239000004020 conductor Substances 0.000 abstract 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 8
- 239000001301 oxygen Substances 0.000 description 8
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 4
- 239000012286 potassium permanganate Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000002270 dispersing agent Substances 0.000 description 3
- 239000007888 film coating Substances 0.000 description 3
- 238000009501 film coating Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 235000010333 potassium nitrate Nutrition 0.000 description 3
- 239000004323 potassium nitrate Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 229960004643 cupric oxide Drugs 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000615 nonconductor Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000003110 molding sand Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Abstract
The invention discloses high-temperature-resistant easy-collapsibility precoated sand for casting. The precoated sand comprises the following components in parts by weight: 97 to 98 parts of original sand, 2 to 2.5 parts of phenolic resin, 0.3 to 0.4 part of urotropine, 0.15 to 0.2 part of calcium stearate, and 0.1 to 0.3 part of anhydrous copper sulfate. The high-temperature-resistant easy-collapsibility precoated sand for casting is prepared by employing the specific components and content, especially, the contained anhydrous copper sulfate has high decomposition temperature which is required to be a high temperature of 650 DEG C or more; when a pouring temperature reaches 1400 DEG C, because the precoated sand is a poor heat conductor, the decomposition temperature is relatively appropriate, and the high temperature resistant performance and the poured collapsibility performance of the precoated sand can be guaranteed. At the same time, the invention also discloses a preparation method of the precoated sand. The method adopts specific steps and a charging sequence, and can quickly obtain the high-temperature-resistant easy-collapsibility precoated sand.
Description
Technical field
The present invention relates to a kind of precoated sand for casting field, especially a kind of casting heat resisting film-coating sand.
Background technology
Precoated sand refers to front molding sand or the core sand that is covered with one deck hard resin film on sand grain surface of moulding.Have two kinds of coating techniques of cold process and Re Fa: cold process by resin dissolves, and adds methenamine with ethanol in mulling process, makes the two be coated on sand grain surface, ethanol volatilization, obtains precoated sand; Hot method is preheating to uniform temperature sand, adds resin and makes its melting, stirs and to make resin-coating at sand grain surface, adds the methenamine aqueous solution and lubricant, cooling, broken, sieve to obtain precoated sand.For steel-casting, ironcasting.Because precoated sand has that intensity is high, gas forming amount is low, production casting dimension accuracy is high, any surface finish, be convenient to the advantages such as preservation, apply in recent years increasingly extensive.
Utilizing at present precoated sand to do in the casting technique of core, when pouring temperature is at 1400 ℃, conventionally can use heat resisting film-coating sand, and the shortcoming of heat resisting film-coating sand maximum is exactly the later stage to clear up very difficult.Existing market has uses the product of the pyrolytic oxygen such as potassium permanganate as the dispersant of precoated sand, but due to its decomposition temperature low (at 200-300 ℃), can only be for non-ferrous casting (pouring temperature be below 800 ℃), if for casting iron craft (pouring temperature is at 800-1400 ℃), can cause when cast does not also complete, dispersant will decompose oxygen, brings into play defeated and dispersed effect, finally causes casting deformation or scraps.So be badly in need of a kind ofly easily decomposing defeated and dispersed precoated sand after not decomposing, pour in when cast.
Summary of the invention
The object of the invention is to overcome above-mentioned the deficiencies in the prior art part and provide a kind of when thering is good resistance to elevated temperatures and normal temperature performance, the casting precoated sand that collapsibility is largely increased; Meanwhile, the present invention also provides the preparation method of described precoated sand.
For achieving the above object, the technical scheme that the present invention takes is: high temperature resistant easy defeated and dispersed precoated sand for a kind of casting, the component that contains following weight portion: 97～98 parts of roughing sand, 2～2.5 parts, phenolic resins, 0.3～0.4 part of methenamine, 0.15～0.2 part of calcium stearate, 0.1～0.3 part of anhydrous cupric sulfate.
Casting of the present invention, with in high temperature resistant easy defeated and dispersed precoated sand, when contained anhydrous cupric sulfate is heated to 650 ℃ of high temperature, can be decomposed into cupric oxide, sulfur dioxide and oxygen.The oxygen that utilization decomposites helps phenolic resins decomposition combustion, reaches defeated and dispersed effect.The dispersant of relative other types (as 200 ℃, potassium permanganate decomposes oxygen and 400 ℃ of decomposition oxygen of potassium nitrate), the decomposition temperature of anhydrous cupric sulfate is high, require 650 ℃ of above high temperature of high temperature, when pouring temperature arrives 1400 ℃, because precoated sand is hot non-conductor, this decomposition temperature is more suitable, can guarantee the resistance to elevated temperatures of precoated sand, can guarantee again the collapsibility performance after cast.
Preferred embodiment as casting of the present invention with high temperature resistant easy defeated and dispersed precoated sand, the content of described anhydrous cupric sulfate is phenolic resin content 4～7%.More preferably embodiment as casting of the present invention with high temperature resistant easy defeated and dispersed precoated sand, the content of described anhydrous cupric sulfate is phenolic resin content 4～6%.Most preferred embodiment as casting of the present invention with high temperature resistant easy defeated and dispersed precoated sand, the content of described anhydrous cupric sulfate is phenolic resin content 5%.The collapsibility of described precoated sand reaches 50% left and right can reach defeated and dispersed better effects, and the addition of anhydrous cupric sulfate is more, and the gas producing when cast can be more, can affect on the contrary the performance of product.Present inventor finds through large quantity research, when the content of anhydrous cupric sulfate is phenolic resin content 5% time, can reach good collapsibility performance, can when cast, not produce excessive gas again simultaneously, and effect is best.
Preferred embodiment as casting of the present invention with high temperature resistant easy defeated and dispersed precoated sand, the component that described precoated sand contains following weight portion: 97 parts of roughing sand, 2 parts, phenolic resins, 0.4 part of methenamine, 0.2 part of calcium stearate, 0.1 part of anhydrous cupric sulfate.
In addition, the present invention also provides the preparation method of a kind of as above arbitrary described casting with high temperature resistant easy defeated and dispersed precoated sand, said method comprising the steps of:
(1) roughing sand is preheating to and requires temperature, then join in puddle mixer;
(2) add phenolic resins, melt overlay film abundant;
(3) add methenamine solution;
Etc. (4) after moisture evaporation, anhydrous cupric sulfate is mixed with calcium stearate, adds anhydrous cupric sulfate and calcium stearate mixture, cooling, screening, detect, packing.
In the preparation method of casting of the present invention with high temperature resistant easy defeated and dispersed precoated sand, anhydrous cupric sulfate and calcium stearate need be mixed, then the mixture of the two be added together.When anhydrous cupric sulfate is together with water, can produce the cupric sulfate pentahydrate that contains the crystallization water, so will trying one's best, cupric sulfate pentahydrate finally adds.Because the addition of anhydrous cupric sulfate is less, therefore, first anhydrous cupric sulfate and calcium stearate are mixed, and then the mixture of the two is added, can effectively improve the dispersing uniformity of anhydrous cupric sulfate.
High temperature resistant easy defeated and dispersed precoated sand for casting of the present invention, adopt specific components and content to combine, and add together with again after needing anhydrous cupric sulfate and calcium stearate to mix in preparation process, especially wherein the anhydrous cupric sulfate containing, while being heated to 650 ℃ of high temperature, can be decomposed into cupric oxide, sulfur dioxide and oxygen.The oxygen that utilization decomposites helps phenolic resins decomposition combustion, reaches defeated and dispersed effect.The decomposition temperature of anhydrous cupric sulfate is high, requires 650 ℃ of above high temperature of high temperature, when pouring temperature arrives 1400 ℃, because precoated sand is hot non-conductor, this decomposition temperature is more suitable, can guarantee the resistance to elevated temperatures of precoated sand, can guarantee again the collapsibility performance after cast.The preparation method of high temperature resistant easy defeated and dispersed precoated sand for casting of the present invention, adopt specific step and charging sequence, preparation technology is simple to operate, prepares the precoated sand of gained in resistance to elevated temperatures and impregnable while of normal temperature performance, and collapsibility is largely increased.
The specific embodiment
For the object, technical solutions and advantages of the present invention are better described, below in conjunction with specific embodiment, the invention will be further described.
Embodiment 1
The present invention casts a kind of embodiment with high temperature resistant easy defeated and dispersed precoated sand, and the precoated sand of described embodiment contains the component of following weight portion: 98 parts of roughing sand, 2.5 parts, phenolic resins, 0.3 part of methenamine, 0.15 part of calcium stearate, 0.3 part of anhydrous cupric sulfate.Described in the present embodiment, precoated sand adopts following methods to be prepared from:
(1) roughing sand is preheating to and requires temperature, then join in puddle mixer;
(2) add phenolic resins, melt overlay film abundant;
(3) add methenamine solution;
Etc. (4) after moisture evaporation, anhydrous cupric sulfate is mixed with calcium stearate, adds anhydrous cupric sulfate and calcium stearate mixture, cooling, screening, detect, packing.
Embodiment 2
The present invention casts a kind of embodiment with high temperature resistant easy defeated and dispersed precoated sand, and the precoated sand of described embodiment contains the component of following weight portion: 97.5 parts of roughing sand, 2.2 parts, phenolic resins, 0.35 part of methenamine, 0.16 part of calcium stearate, 0.11 part of anhydrous cupric sulfate.Described in the present embodiment, the preparation method of precoated sand is with embodiment 1.
Embodiment 3
The present invention casts a kind of embodiment with high temperature resistant easy defeated and dispersed precoated sand, and the precoated sand of described embodiment contains the component of following weight portion: 97 parts of roughing sand, 2 parts, phenolic resins, 0.4 part of methenamine, 0.2 part of calcium stearate, 0.1 part of anhydrous cupric sulfate.Described in the present embodiment, the preparation method of precoated sand is with embodiment 1.
Embodiment 4
The present invention casts a kind of embodiment with high temperature resistant easy defeated and dispersed precoated sand, and the precoated sand of described embodiment contains the component of following weight portion: 98 parts of roughing sand, 2.5 parts, phenolic resins, 0.4 part of methenamine, 0.175 part of calcium stearate, 0.175 part of anhydrous cupric sulfate.Described in the present embodiment, the preparation method of precoated sand is with embodiment 1.
Embodiment 5
The present invention casts a kind of embodiment with high temperature resistant easy defeated and dispersed precoated sand, and the precoated sand of described embodiment contains the component of following weight portion: 97 parts of roughing sand, 2 parts, phenolic resins, 0.3 part of methenamine, 0.18 part of calcium stearate, 0.12 part of anhydrous cupric sulfate.Described in the present embodiment, the preparation method of precoated sand is with embodiment 1.
Embodiment 6
The present invention casts a kind of embodiment with high temperature resistant easy defeated and dispersed precoated sand, and the precoated sand of described embodiment contains the component of following weight portion: 97 parts of roughing sand, 2.5 parts, phenolic resins, 0.3 part of methenamine, 0.2 part of calcium stearate, 0.1 part of anhydrous cupric sulfate.Described in the present embodiment, the preparation method of precoated sand is with embodiment 1.
The resistance to elevated temperatures of embodiment 7 precoated sands of the present invention, normal temperature performance and collapsibility test
Test arranges control group and invention group, and invention component is invention group 1-6, the precoated sand that invention group 1-6 adopts respectively embodiment 1-6 to prepare.Control group is divided into control group 1 and control group 2, and control group 1 and 2 precoated sands that adopt are as follows respectively.
The component that the precoated sand that control group 1 adopts contains following weight portion: 97 parts of roughing sand, 2 parts, phenolic resins, 0.4 part of methenamine, 0.2 part of calcium stearate, 0.1 part, potassium permanganate.
The component that the precoated sand that control group 2 adopts contains following weight portion: 97 parts of roughing sand, 2 parts, phenolic resins, 0.4 part of methenamine, 0.2 part of calcium stearate, 0.1 part, potassium nitrate.
Described in control group 1 and control group 2, described in the precoated sand employing embodiment of the present invention, method is prepared from, and different is first potassium permanganate or potassium nitrate to be mixed with calcium stearate, and then adds together.
Detect in accordance with the following methods respectively the following performance of invention group and control group:
1, room temperature tensile strength: detection method is referring to JB/T8583-2008;
2, heat-resistant time: " one " type sample piece by making, be steadily placed on " recessed " type support, put into the high temperature furnace of 1000 ℃, measure its slump time;
3, collapsibility: after the sample piece making is weighed, put into pallet, put into the high temperature furnace of 1000 ℃, within 30 seconds, take out afterwards, wait cooling after, the roughing sand being scattered is weighed, divided by original weight, be collapsibility.
Testing result is shown in Table 1:
Table 1 room temperature tensile strength, heat-resistant time and collapsibility testing result
| Group | Room temperature tensile strength (Mpa) | Heat-resistant time (s) | Collapsibility (%) |
| Control group 1 | 4.5 | 186 | 17 |
| Control group 2 | 4.5 | 189 | 18 |
| Invention group 1 | 4.5 | 190 | 35 |
| Invention group 2 | 4.5 | 188 | 42 |
| Invention group 3 | 4.5 | 193 | 51 |
| Invention group 4 | 4.5 | 191 | 43 |
| Invention group 5 | 4.5 | 187 | 40 |
| Invention group 6 | 4.5 | 192 | 43 |
As seen from Table 1, invention group 1-6 compares with 2 with control group 1, and collapsibility is significantly increased; And in invention group 1-6, invention group 2,4,5,6 is compared with invention group 1, collapsibility is improved, and invention group 3 is compared with other groups, and the increase rate that collapsibility has is maximum.
Last institute should be noted that; above embodiment is only in order to illustrate technical scheme of the present invention but not limiting the scope of the invention; although the present invention is explained in detail with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify or be equal to replacement technical scheme of the present invention, and not depart from essence and the scope of technical solution of the present invention.
Claims (6)
1. a high temperature resistant easy defeated and dispersed precoated sand for casting, is characterized in that the component that contains following weight portion: 97～98 parts of roughing sand, 2～2.5 parts, phenolic resins, 0.3～0.4 part of methenamine, 0.15～0.2 part of calcium stearate, 0.1～0.3 part of anhydrous cupric sulfate.
2. high temperature resistant easy defeated and dispersed precoated sand for casting as claimed in claim 1, is characterized in that, the content of described anhydrous cupric sulfate is phenolic resin content 4～7%.
3. high temperature resistant easy defeated and dispersed precoated sand for casting as claimed in claim 2, is characterized in that, the content of described anhydrous cupric sulfate is phenolic resin content 4～6%.
4. high temperature resistant easy defeated and dispersed precoated sand for casting as claimed in claim 3, is characterized in that, the content of described anhydrous cupric sulfate is phenolic resin content 5%.
5. high temperature resistant easy defeated and dispersed precoated sand for casting as claimed in claim 1, is characterized in that the component that contains following weight portion: 97 parts of roughing sand, 2 parts, phenolic resins, 0.4 part of methenamine, 0.2 part of calcium stearate, 0.1 part of anhydrous cupric sulfate.
6. as described in as arbitrary in claim 1-5, the preparation method of high temperature resistant easy defeated and dispersed precoated sand for casting, is characterized in that, comprises the following steps:
(1) roughing sand is preheating to and requires temperature, then join in puddle mixer;
(2) add phenolic resins, melt overlay film abundant;
(3) add methenamine solution;
Etc. (4) after moisture evaporation, anhydrous cupric sulfate is mixed with calcium stearate, adds anhydrous cupric sulfate and calcium stearate mixture, cooling, screening, detect, packing.
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| CN201310469475.0A CN103521676B (en) | 2013-10-10 | 2013-10-10 | High-temperature-reseasyng easyng collapse precoated sand is used in a kind of casting |
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| CN201310469475.0A CN103521676B (en) | 2013-10-10 | 2013-10-10 | High-temperature-reseasyng easyng collapse precoated sand is used in a kind of casting |
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| CN103521676B CN103521676B (en) | 2015-09-23 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104226888A (en) * | 2014-08-29 | 2014-12-24 | 吴江市液铸液压件铸造有限公司 | Easily-scattered precoated sand and preparation method thereof |
| CN104525870A (en) * | 2014-12-11 | 2015-04-22 | 牡丹江金缘钩缓制造有限责任公司 | Manufacturing method of buffer box body |
| CN104889313A (en) * | 2015-04-24 | 2015-09-09 | 北京仁创科技集团有限公司 | Coated sand preparation method |
| CN108127073A (en) * | 2018-01-15 | 2018-06-08 | 柳州市柳晶科技股份有限公司 | A kind of casting heat resisting film-coating sand |
| CN110227793A (en) * | 2019-06-12 | 2019-09-13 | 新沂市天巍覆膜砂实业有限公司 | A kind of casting High-temperature-reseasyng easyng collapse precoated sand |
| 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 |
| CN112692225A (en) * | 2019-10-22 | 2021-04-23 | 柳晶（溧阳）环保科技有限公司 | Ultra-high temperature resistant precoated sand |
| CN113263133A (en) * | 2021-05-07 | 2021-08-17 | 柳州柳晶环保科技有限公司 | 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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| CN104226888A (en) * | 2014-08-29 | 2014-12-24 | 吴江市液铸液压件铸造有限公司 | Easily-scattered precoated sand and preparation method thereof |
| CN104226888B (en) * | 2014-08-29 | 2016-07-06 | 吴江市液铸液压件铸造有限公司 | A kind of easy defeated and dispersed precoated sand and preparation method thereof |
| CN104525870A (en) * | 2014-12-11 | 2015-04-22 | 牡丹江金缘钩缓制造有限责任公司 | Manufacturing method of buffer box body |
| CN104889313A (en) * | 2015-04-24 | 2015-09-09 | 北京仁创科技集团有限公司 | Coated sand preparation method |
| CN104889313B (en) * | 2015-04-24 | 2019-01-18 | 北京仁创科技集团有限公司 | A kind of precoated sand preparation method |
| CN108127073A (en) * | 2018-01-15 | 2018-06-08 | 柳州市柳晶科技股份有限公司 | A kind of casting heat resisting film-coating sand |
| CN110227793A (en) * | 2019-06-12 | 2019-09-13 | 新沂市天巍覆膜砂实业有限公司 | A kind of casting High-temperature-reseasyng easyng collapse precoated sand |
| CN112692225A (en) * | 2019-10-22 | 2021-04-23 | 柳晶（溧阳）环保科技有限公司 | Ultra-high temperature resistant precoated sand |
| 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 |
| CN112296248B (en) * | 2020-11-03 | 2022-05-31 | 重庆长江造型材料（集团）股份有限公司 | Easily-collapsible precoated sand and preparation method thereof |
| CN113263133A (en) * | 2021-05-07 | 2021-08-17 | 柳州柳晶环保科技有限公司 | 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 |
| 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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| CN103521676B (en) | 2015-09-23 |
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