CN109108210A - A kind of graft modification mullite moulding sand for casting - Google Patents
A kind of graft modification mullite moulding sand for casting Download PDFInfo
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- CN109108210A CN109108210A CN201811112903.3A CN201811112903A CN109108210A CN 109108210 A CN109108210 A CN 109108210A CN 201811112903 A CN201811112903 A CN 201811112903A CN 109108210 A CN109108210 A CN 109108210A
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- mullite
- casting
- graft modification
- sand
- phosphate
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- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
- Silicates, Zeolites, And Molecular Sieves (AREA)
Abstract
The invention discloses a kind of graft modification mullite moulding sand for casting, are related to casting technology field, are made of following component: modified mullite, bentonite, flyash, sodium cocoyl methyl sodium taurocholate, phosphate, diethyl aminomalonate, castor oil；The present invention enables to moulding-sand property to be significantly improved, so that the quality of casting obtains universal raising by adding modified mullite.
Description
Technical field
The invention belongs to casting technology fields, and in particular to a kind of graft modification mullite moulding sand for casting.
Background technique
Molding sand is Modeling Material important in foundry production, and quality good or not determines the yield rate of casting.Molding sand
It is generally kneaded (or heat treatment) by foundry sands, binder and auxiliary additive etc. to form, not according to its main chemical compositions
It is same to be divided into clay-beaded sand, mullite molding sand and quartzy molding sand.
Quartzy molding sand is to research and develop relatively early, and one of widely used molding sand kind, generally using quartz sand as raw material, such as
" a kind of using quartz sand as molding sand of major ingredient and preparation method thereof " (201310131234.5) or discarded quartz raw material, it is such as " a kind of
Waste and old quartz glass heat-resistant cast molding sand and preparation method thereof (201410711159.4), are aided with bonding agent, dispersing agent and surface
Activating agent etc., through mixing.The thermal coefficient of quartzy molding sand is big, and the thermal shock of (600 DEG C of >) quartz molding sand is steady under hot conditions
It is qualitative preferable, but its structure is single, and when temperature≤600 DEG C, thermal shock resistance is drastically reduced, and then is applied to cause
Certain obstacle.
Summary of the invention
The purpose of the present invention is being directed to existing problem, a kind of graft modification mullite moulding sand for casting is provided.
The present invention is achieved by the following technical solutions:
A kind of graft modification mullite moulding sand for casting, is made of following component by weight: modified mullite 100-105,
Bentonite 32-38, flyash 12-14, sodium cocoyl methyl sodium taurocholate 1.2-1.6, phosphate 1.5-1.9, amidomalonic acid
Diethylester 1-3, castor oil 2-4, water 3-6；Quartz sand containing its quality 20-21% in the modified mullite.
Further, the modified mullite preparation method the following steps are included:
(1) mullite pre-processes: mullite is put into treatment fluid and carries out impregnation, is then heated to 78 DEG C, with
1300r/min revolving speed stirs 1 hour, is then filtered, is cleaned using deionized water, dries to constant weight to get pre-processing not
Carry out stone；The treatment fluid parts by weights meter is made of following component: butane tetracarboxylic acid 1.2, ethyl alcohol 5, alkyl polyglucoside 3,
Dihydric phosphate 1, deionized water 40；
(2) nano diatomite is modified: after nano diatomite is mixed with coupling agent solution by 1:5 mass ratio, in 120r/min
Revolving speed stirs 2 hours, is then filtered, dry to constant weight；
(3) graft modification: after mixing by pretreatment mullite obtained above and quartz sand, 5 times of mullite quality are added
Glycerine, then carry out being milled to 80 μm of granularity, obtain mixed powder, mixed powder is immersed in Dopamine hydrochloride solution
In, then the nano diatomite obtained above of mixed powder quality 1.1-1.3% is added, it is stirred at 60 DEG C with 1800r/min revolving speed
It mixes 3 hours, is then milled to 50 μm of granularity for the second time again, then filtered, cleaned using clear water to neutrality, it is dry to perseverance
Weight to get.
Further, step (1) mullite and treatment fluid mixed proportion are 80g:230mL.
Further, dihydric phosphate described in step (1) is any in potassium dihydrogen phosphate or sodium dihydrogen phosphate.
Further, coupling agent solution described in step (2) is that the organo silane coupling agent that concentration is 0.53mol/L is molten
Liquid.
Further, Dopamine hydrochloride solution concentration described in step (3) is 1.2mol/L.
Further, the phosphate is sodium phosphate.
A kind of graft modification mullite moulding sand for casting sintering temperature is 1410 DEG C.
The utility model has the advantages that the present invention is modified mullite by adding, moulding-sand property is enabled to be significantly improved, so that
The quality of casting obtains universal raising, and gas hole defect decline 38%, sand holes defect decline 45%, total rejection rate has dropped 5.2%,
By the addition of modified mullite, sand permeability is enabled to be significantly improved, and when metal liquid contact-type chamber
The gas of generation greatly reduces, so that bleb is reduced, therefore burning into sand defect is also eliminated, thus, sand hole is also bright
It is aobvious to reduce；The present invention assists the effect of modified mullite by the proportion of each component, can effectively improve the sintering activity of powder
With balling-up, be conducive to the compressive resistance for promoting modified mullite molding sand.The present invention is composite modified using mullite and quartz sand
Crystallite nucleus composite construction can be formed in situ in obtained modification mullite during the sintering process, to improve modified not next
The thermal shock resistance of stone-type sand especially improves the thermal shock resistance under the conditions of low temperature (when temperature≤600 DEG C).The present invention is made
Standby modification mullite molding sand is through detecting: refractoriness is 1650 DEG C or so；By the way that nano diatomite is particle grafted to mullite
With quartz sand particle surface, it can be improved porosity at its surface alignment at space network, increase ventilative
Property, meanwhile, by the characteristic of mullite and quartz sand composite construction, can improve to a certain extent steady after being solidified between molding sand
It is qualitative, so that molding sand is more easily separated with casting in demoulding.
Specific embodiment
Embodiment 1
A kind of graft modification mullite moulding sand for casting, is made of following component by weight: modified mullite 100, swelling
Native 32, flyash 12, sodium cocoyl methyl sodium taurocholate 1.2, phosphate 1.5, diethyl aminomalonate 1, castor oil 2, water
3；Quartz sand containing its quality 20% in the modified mullite.
Further, the modified mullite preparation method the following steps are included:
(1) mullite pre-processes: mullite is put into treatment fluid and carries out impregnation, is then heated to 78 DEG C, with
1300r/min revolving speed stirs 1 hour, is then filtered, is cleaned using deionized water, dries to constant weight to get pre-processing not
Carry out stone；The treatment fluid parts by weights meter is made of following component: butane tetracarboxylic acid 1.2, ethyl alcohol 5, alkyl polyglucoside 3,
Dihydric phosphate 1, deionized water 40；
(2) nano diatomite is modified: after nano diatomite is mixed with coupling agent solution by 1:5 mass ratio, in 120r/min
Revolving speed stirs 2 hours, is then filtered, dry to constant weight；
(3) graft modification: after mixing by pretreatment mullite obtained above and quartz sand, 5 times of mullite quality are added
Glycerine, then carry out being milled to 80 μm of granularity, obtain mixed powder, mixed powder is immersed in Dopamine hydrochloride solution
In, then the nano diatomite obtained above of mixed powder quality 1.1-1.3% is added, it is stirred at 60 DEG C with 1800r/min revolving speed
It mixes 3 hours, is then milled to 50 μm of granularity for the second time again, then filtered, cleaned using clear water to neutrality, it is dry to perseverance
Weight to get.
Further, step (1) mullite and treatment fluid mixed proportion are 80g:230mL.
Further, dihydric phosphate described in step (1) is any in potassium dihydrogen phosphate or sodium dihydrogen phosphate.
Further, coupling agent solution described in step (2) is that the organo silane coupling agent that concentration is 0.53mol/L is molten
Liquid.
Further, Dopamine hydrochloride solution concentration described in step (3) is 1.2mol/L.
Further, the phosphate is sodium phosphate.
Embodiment 2
A kind of graft modification mullite moulding sand for casting, is made of following component by weight: modified mullite 105, swelling
Native 38, flyash 14, sodium cocoyl methyl sodium taurocholate 1.6, phosphate 1.9, diethyl aminomalonate 3, castor oil 4, water
6；Quartz sand containing its quality 21% in the modified mullite.
Further, the modified mullite preparation method the following steps are included:
(1) mullite pre-processes: mullite is put into treatment fluid and carries out impregnation, is then heated to 78 DEG C, with
1300r/min revolving speed stirs 1 hour, is then filtered, is cleaned using deionized water, dries to constant weight to get pre-processing not
Carry out stone；The treatment fluid parts by weights meter is made of following component: butane tetracarboxylic acid 1.2, ethyl alcohol 5, alkyl polyglucoside 3,
Dihydric phosphate 1, deionized water 40；
(2) nano diatomite is modified: after nano diatomite is mixed with coupling agent solution by 1:5 mass ratio, in 120r/min
Revolving speed stirs 2 hours, is then filtered, dry to constant weight；
(3) graft modification: after mixing by pretreatment mullite obtained above and quartz sand, 5 times of mullite quality are added
Glycerine, then carry out being milled to 80 μm of granularity, obtain mixed powder, mixed powder is immersed in Dopamine hydrochloride solution
In, then the nano diatomite obtained above of mixed powder quality 1.1-1.3% is added, it is stirred at 60 DEG C with 1800r/min revolving speed
It mixes 3 hours, is then milled to 50 μm of granularity for the second time again, then filtered, cleaned using clear water to neutrality, it is dry to perseverance
Weight to get.
Further, step (1) mullite and treatment fluid mixed proportion are 80g:230mL.
Further, dihydric phosphate described in step (1) is any in potassium dihydrogen phosphate or sodium dihydrogen phosphate.
Further, coupling agent solution described in step (2) is that the organo silane coupling agent that concentration is 0.53mol/L is molten
Liquid.
Further, Dopamine hydrochloride solution concentration described in step (3) is 1.2mol/L.
Further, the phosphate is sodium phosphate.
Embodiment 3
A kind of graft modification mullite moulding sand for casting, is made of following component by weight: modified mullite 102, swelling
Native 35, flyash 13, sodium cocoyl methyl sodium taurocholate 1.5, phosphate 1.6, diethyl aminomalonate 2, castor oil 3, water
5；Quartz sand containing its quality 2.5% in the modified mullite.
Further, the modified mullite preparation method the following steps are included:
(1) mullite pre-processes: mullite is put into treatment fluid and carries out impregnation, is then heated to 78 DEG C, with
1300r/min revolving speed stirs 1 hour, is then filtered, is cleaned using deionized water, dries to constant weight to get pre-processing not
Carry out stone；The treatment fluid parts by weights meter is made of following component: butane tetracarboxylic acid 1.2, ethyl alcohol 5, alkyl polyglucoside 3,
Dihydric phosphate 1, deionized water 40；
(2) nano diatomite is modified: after nano diatomite is mixed with coupling agent solution by 1:5 mass ratio, in 120r/min
Revolving speed stirs 2 hours, is then filtered, dry to constant weight；
(3) graft modification: after mixing by pretreatment mullite obtained above and quartz sand, 5 times of mullite quality are added
Glycerine, then carry out being milled to 80 μm of granularity, obtain mixed powder, mixed powder is immersed in Dopamine hydrochloride solution
In, then the nano diatomite obtained above of mixed powder quality 1.1-1.3% is added, it is stirred at 60 DEG C with 1800r/min revolving speed
It mixes 3 hours, is then milled to 50 μm of granularity for the second time again, then filtered, cleaned using clear water to neutrality, it is dry to perseverance
Weight to get.
Further, step (1) mullite and treatment fluid mixed proportion are 80g:230mL.
Further, dihydric phosphate described in step (1) is any in potassium dihydrogen phosphate or sodium dihydrogen phosphate.
Further, coupling agent solution described in step (2) is that the organo silane coupling agent that concentration is 0.53mol/L is molten
Liquid.
Further, Dopamine hydrochloride solution concentration described in step (3) is 1.2mol/L.
Further, the phosphate is sodium phosphate.
Comparative example 1: the untreated mullite for being only that and modified mullite being replaced with to equivalent is distinguished with embodiment 1.
Comparative example 2: the untreated quartz sand for being only that and modified mullite being replaced with to equivalent is distinguished with embodiment 1.
Comparative example 3: the mullite and quartz sand physics for being only that and modified mullite being replaced with to equivalent are distinguished with embodiment 1
Mixture.
To embodiment and comparative example moulding-sand property performance detection:
Table 1
| Gas permeability | Green compression strength (kgN/cm2) | |
| Embodiment mean value | 166 | 1.25 |
| Comparative example 1 | 149 | 0.79 |
| Comparative example 2 | 137 | 0.98 |
| Comparative example 3 | 145 | 1.03 |
As can be seen from Table 1, sand permeability prepared by the present invention is had excellent performance with green compression strength.
Claims (7)
1. a kind of graft modification mullite moulding sand for casting, which is characterized in that be made by weight of following component: being modified not
Come stone 100-105, bentonite 32-38, flyash 12-14, sodium cocoyl methyl sodium taurocholate 1.2-1.6, phosphate 1.5-
1.9, diethyl aminomalonate 1-3, castor oil 2-4, water 3-6；Stone containing its quality 20-21% in the modified mullite
Sand.
2. a kind of graft modification mullite moulding sand for casting as described in claim 1, which is characterized in that the modified mullite
Preparation method the following steps are included:
(1) mullite pre-processes: mullite is put into treatment fluid and carries out impregnation, is then heated to 78 DEG C, with
1300r/min revolving speed stirs 1 hour, is then filtered, is cleaned using deionized water, dries to constant weight to get pre-processing not
Carry out stone；The treatment fluid parts by weights meter is made of following component: butane tetracarboxylic acid 1.2, ethyl alcohol 5, alkyl polyglucoside 3,
Dihydric phosphate 1, deionized water 40；
(2) nano diatomite is modified: after nano diatomite is mixed with coupling agent solution by 1:5 mass ratio, in 120r/min
Revolving speed stirs 2 hours, is then filtered, dry to constant weight；
(3) graft modification: after mixing by pretreatment mullite obtained above and quartz sand, 5 times of mullite quality are added
Glycerine, then carry out being milled to 80 μm of granularity, obtain mixed powder, mixed powder is immersed in Dopamine hydrochloride solution
In, then the nano diatomite obtained above of mixed powder quality 1.1-1.3% is added, it is stirred at 60 DEG C with 1800r/min revolving speed
It mixes 3 hours, is then milled to 50 μm of granularity for the second time again, then filtered, cleaned using clear water to neutrality, it is dry to perseverance
Weight to get.
3. a kind of graft modification mullite moulding sand for casting as claimed in claim 2, which is characterized in that step (1) is described not
Carry out stone and treatment fluid mixed proportion is 80g:230mL.
4. a kind of graft modification mullite moulding sand for casting as claimed in claim 2, which is characterized in that described in step (1)
Dihydric phosphate is any in potassium dihydrogen phosphate or sodium dihydrogen phosphate.
5. a kind of graft modification mullite moulding sand for casting as claimed in claim 2, which is characterized in that described in step (2)
Coupling agent solution is the organo silane coupling agent solution that concentration is 0.53mol/L.
6. a kind of graft modification mullite moulding sand for casting as claimed in claim 2, which is characterized in that described in step (3)
Dopamine hydrochloride solution concentration is 1.2mol/L.
7. a kind of graft modification mullite moulding sand for casting as described in claim 1, which is characterized in that the phosphate is phosphorus
Sour sodium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811112903.3A CN109108210A (en) | 2018-09-25 | 2018-09-25 | A kind of graft modification mullite moulding sand for casting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811112903.3A CN109108210A (en) | 2018-09-25 | 2018-09-25 | A kind of graft modification mullite moulding sand for casting |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102814460A (en) * | 2012-08-20 | 2012-12-12 | 合肥江淮铸造有限责任公司 | Casting molding sand and preparation method thereof |
| CN104294591A (en) * | 2014-10-09 | 2015-01-21 | 华东理工大学 | Mullite fiber surface modification method |
| CN104475643A (en) * | 2014-11-03 | 2015-04-01 | 繁昌县琦祥铸造厂 | Carbon steel cast molding sand and preparation method thereof |
| CN105458162A (en) * | 2015-11-30 | 2016-04-06 | 中北大学 | Rapid preparing method for coating for gray iron metal mold casting |
| JP2016150369A (en) * | 2015-02-18 | 2016-08-22 | 山川産業株式会社 | Artificial sand and binder-containing sand for template |
-
2018
- 2018-09-25 CN CN201811112903.3A patent/CN109108210A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102814460A (en) * | 2012-08-20 | 2012-12-12 | 合肥江淮铸造有限责任公司 | Casting molding sand and preparation method thereof |
| CN104294591A (en) * | 2014-10-09 | 2015-01-21 | 华东理工大学 | Mullite fiber surface modification method |
| CN104475643A (en) * | 2014-11-03 | 2015-04-01 | 繁昌县琦祥铸造厂 | Carbon steel cast molding sand and preparation method thereof |
| JP2016150369A (en) * | 2015-02-18 | 2016-08-22 | 山川産業株式会社 | Artificial sand and binder-containing sand for template |
| CN105458162A (en) * | 2015-11-30 | 2016-04-06 | 中北大学 | Rapid preparing method for coating for gray iron metal mold casting |
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Application publication date: 20190101 |