CN107913975A - A kind of precoated sand - Google Patents
A kind of precoated sand Download PDFInfo
- Publication number
- CN107913975A CN107913975A CN201711374308.2A CN201711374308A CN107913975A CN 107913975 A CN107913975 A CN 107913975A CN 201711374308 A CN201711374308 A CN 201711374308A CN 107913975 A CN107913975 A CN 107913975A
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- Prior art keywords
- sand
- precoated sand
- precoated
- weight
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Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/20—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents
- B22C1/22—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins
- B22C1/2233—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- B22C1/2246—Condensation polymers of aldehydes and ketones
- B22C1/2253—Condensation polymers of aldehydes and ketones with phenols
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
- B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
- B22C1/20—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents
- B22C1/22—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins
- B22C1/2233—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents of organic agents of resins or rosins obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- B22C1/226—Polyepoxides
Abstract
The present invention provides a kind of precoated sand, including：100 parts by weight of roughing sand；12~18 parts by weight of binding agent；4~8 parts by weight of curing agent；8~12 parts by weight of coupling agent；2~5 parts by weight of lubricant.Compared with prior art, the present invention is by selecting fine and smooth and containing high SiO2Or Al2O3Roughing sand and increase binding agent content, make the mesh number of precoated sand in 70~140 mesh, AFS coefficient values are partially thin, between 68~72, so as to improve the degree of packing of precoated sand, and then its temperature tolerance is improved, while can also improve by adjusting the content of binding agent the tensile strength of precoated sand, so as to can be widely applied to molten steel metallurgy sensor industry, metallurgical sensor long-distance transport requirement and onsite application requirement are fully met.
Description
Technical field
The invention belongs to casting technology field, more particularly to a kind of precoated sand.
Background technology
With the development of foundry engieering, the development of the growth of casting export amount, especially auto industry, casting industry development
Rapidly, cause the usage amount of the precoated sand of casting also higher and higher.At the end of the nineties, China's precoated sand annual output is up to 200,000
Ton, to 2009, related data statistics, China's precoated sand annual output alreadyd exceed 900,000 tons, and is also increasing year by year.Overlay film
Sand can be divided into hot method overlay film, warm therapy overlay film and cold process overlay film according to preparing process.The precoated sand produced with hot method coating technique
There is intensity high, good fluidity and prevented from caking, therefore people's generally use hot method coating technique.
At present, precoated sand on the market is mainly used in cast iron, cast steel, alloy cast steel and non-ferrous casting industry,
Precoated sand room temperature tensile strength applied to these industries is usually in 3.5~4.0MPa, and mesh number is between 50~100 mesh, AFS values
48~50, particle diameter is thick.And with the rise of molten steel sensor, for example sampler, Determining oxygen probe, determine HydroNit sensor etc. and be required for
High-volume uses precoated sand.Precoated sand desired strength applied to molten steel sensor industry is high and temperature tolerance reach 1600 DEG C~
1700 DEG C, and applied to casting industry precoated sand since roughing sand is thick, intensity is low after shaping, the temperature tolerance reason such as not enough, nothing
Method is applied to molten steel sensor industry.
The content of the invention
In view of this, the technical problem to be solved in the present invention is to provide a kind of high intensity, heat safe precoated sand.
The present invention provides a kind of precoated sand, including：
Preferably, one or more of the roughing sand in silica sand, magnesia, zircon sand and emergy.
Preferably, sea sand of the roughing sand in silica sand.
Preferably, one or more of the binding agent in phenolic resin, epoxy resin and phenol-formaldehyde resin modified.
Preferably, the curing agent is selected from hexa, polyformaldehyde, trihydroxy phenol and polyhydroxymethyl melamine
In one or more.
Preferably, the coupling agent is selected from silane coupling agent.
Preferably, the lubricant is selected from calcium stearate.
Preferably, the mesh number of the roughing sand is 70~140 mesh.
Preferably, the AFS coefficients of the precoated sand are 68~72.
Preferably, the resistance to elevated temperatures of the precoated sand is 1600 DEG C~1700 DEG C；Room temperature tensile strength is more than or equal to
6MPa；Burning decrement is 4.2%~4.5%.
The present invention provides a kind of precoated sand, including：100 parts by weight of roughing sand；12~18 parts by weight of binding agent；Curing agent 4
~8 parts by weight；8~12 parts by weight of coupling agent；2~5 parts by weight of lubricant.Compared with prior art, the present invention is thin by selecting
It is greasy and contain high SiO2Or Al2O3Roughing sand and increase binding agent content, make the mesh number of precoated sand in 70~140 mesh, AFS systems
Numerical value is partially thin, between 68~72, so as to improve the degree of packing of precoated sand, and then improves its temperature tolerance, while can also pass through tune
The content of whole binding agent improves the tensile strength of precoated sand, so as to can be widely applied to molten steel metallurgy sensor industry, completely
Meet that metallurgical sensor long-distance transport requires and onsite application requires.
Experiment shows, the heat resistance of precoated sand provided by the invention reaches 1700 DEG C, room temperature tensile strength 6MPa with
On, burning decrement reaches 4.2%~4.5%.
Brief description of the drawings
Fig. 1 is crystalline phase microscope figure of the precoated sand obtained in the embodiment of the present invention 1 after curing at a temperature of 250 DEG C；
Fig. 2 is crystalline phase microscope figure of the precoated sand obtained in the embodiment of the present invention 2 after curing at a temperature of 250 DEG C；
Fig. 3 is crystalline phase microscope figure of the precoated sand obtained in the embodiment of the present invention 3 after curing at a temperature of 250 DEG C；
Fig. 4 is crystalline phase microscope figure of the precoated sand obtained in the embodiment of the present invention 4 after curing at a temperature of 250 DEG C.
Embodiment
Below in conjunction with the embodiment of the present invention, the technical solution in the embodiment of the present invention is clearly and completely described,
Obviously, described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.Based in the present invention
Embodiment, those of ordinary skill in the art's all other embodiments obtained without making creative work, all
Belong to the scope of protection of the invention.
The present invention provides a kind of precoated sand, including：
Wherein, the present invention is not particularly limited the source of all raw materials, is commercially available.
The roughing sand is roughing sand well known to those skilled in the art, has no special limitation, is preferably in the present invention
Sea sand in one or more in silica sand, magnesia, zircon sand and emergy, more preferably silica sand, its SiO2Content is up to 99%；
When the roughing sand includes silica sand, the mixture of silica sand and emergy is preferably included；The mass ratio of the silica sand and emergy is excellent
Elect as (3~5)：1, more preferably (4~5)：1；When the roughing sand includes the mixture of silica sand and emergy, also preferably wrap
Include magnesia；The mass ratio of the silica sand, magnesia and emergy is preferably (3~5)：1:1, more preferably (4~5)：1:1；It is described
The mesh number of roughing sand is preferably 70~140 mesh.
According to the present invention, the content of the binding agent in the precoated sand is preferably 14~18 parts by weight, more preferably 16~
18 parts by weight；The binding agent is binding agent well known to those skilled in the art, has no special limitation, excellent in of the invention
Elect the one or more in phenolic resin, epoxy resin and phenol-formaldehyde resin modified as.
The content of the curing agent is preferably 5~8 parts by weight, more preferably 6~7 parts by weight；The curing agent is ability
Curing agent known to field technique personnel, has no special limitation, is preferably hexa, that is, Wu Luotuo in the present invention
One or more in product, polyformaldehyde, tri hydroxy methyl phenol and polyhydroxymethyl melamine.
The content of the coupling agent is preferably 8~10 parts by weight；The coupling agent is idol well known to those skilled in the art
Join agent, have no special limitation, be preferably silane coupling agent in the present invention, more preferably KH550, KH560, KH570.
The content of the lubricant is preferably 3~5 parts by weight, more preferably 3~4 parts by weight, is further preferably 3~3.5 weights
Measure part；The lubricant is lubricant well known to those skilled in the art, has no special limitation, is preferably in the present invention
Calcium stearate.
According to the present invention, the mesh number of the precoated sand is preferably 70~140 mesh；The AFS coefficients of the precoated sand are preferably
68~72；The resistance to elevated temperatures of the precoated sand is preferably 1600 DEG C~1700 DEG C；Room temperature tensile strength is preferably greater than or equal to
6MPa；Burning decrement is preferably 4.2%~4.5%.
The present invention is by selecting fine and smooth and containing high SiO2Or Al2O3Roughing sand and increase binding agent content, make precoated sand
Mesh number in 70~140 mesh, AFS coefficient values are partially thin, between 68~72, so as to improve the degree of packing of precoated sand, and then improve
Its temperature tolerance, while can also improve by adjusting the content of binding agent the tensile strength of precoated sand, so as to can be widely applied to
Molten steel metallurgy sensor industry, fully meets metallurgical sensor long-distance transport requirement and onsite application requirement.
Present invention also offers a kind of preparation method of above-mentioned precoated sand, including：By the roughing sand of 100 parts by weight, 12~18
The binding agent of parts by weight, the curing agent of 4~8 parts by weight, the coupling agent of 8~12 parts by weight and the lubricant of 2~5 parts by weight mix
Close, obtain precoated sand.
According to the present invention, the charging sequence of above-mentioned raw materials is preferably：First plus roughing sand, then add bonding agent, then add and cure
Agent, then add coupling agent, it is eventually adding lubricant.
In order to further illustrate the present invention, a kind of precoated sand provided by the invention is retouched in detail with reference to embodiments
State.
Reagent used is commercially available in following embodiments.
Embodiment 1
The precoated sand includes by weight：
The roughing sand is the mixture (weight ratio 4 of silica sand and emergy:1), the bonding agent is phenolic resin, described
Curing agent is methenamine, and the coupling agent is silane coupling agent KH570, and the lubricant is calcium stearate.
The performance of precoated sand to being obtained in embodiment 1 is detected, and detection method is as follows：The detection of resistance to elevated temperatures is
Product is used in 1750 DEG C of molten steel, stops 20 seconds, it is defeated and dispersed to see product surface whether there is；Room temperature tensile strength is according to national standard
The regulation of GB2684 carries out；The test temperature of burning decrement is 1000 DEG C, time 30min；Particle diameter uses shake pendulum-type sand sieving machine
Tested.Testing result shows it with extraordinary resistance to elevated temperatures, the high temperature of 1750 DEG C of ability, its room temperature tensile strength
Reach 6.5MPa, burning decrement 4.4%, the particle diameter of precoated sand is 70~140 mesh, and AFS values are 68.6.
By the precoated sand obtained in embodiment 1 after curing at a temperature of 250 DEG C, it is examined using metallographic microscope
Survey, it is as shown in Figure 1 to obtain its crystalline phase microscope figure.As shown in Figure 1, roughing sand particle diameter is fine and smooth, particle diameter between 100 μm~200 μm,
Phenolic resin overlays on tightly and uniformly roughing sand surface, the product dense uniform produced with the present embodiment precoated sand, resistance to height
Temperature, intensity is high, can be widely applied to molten steel sensor industry.
Embodiment 2
The precoated sand includes by weight：
The roughing sand is sea sand, SiO2Content is up to 99%, and the bonding agent is phenolic resin, and the curing agent is black Lip river
Tropine, the coupling agent are silane coupling agent KH560, and the lubricant is calcium stearate.
The performance of precoated sand to being obtained in embodiment 2 is detected, and detection method is as follows：The detection of resistance to elevated temperatures is
Product is used in 1700 DEG C of molten steel, stops 20 seconds, it is defeated and dispersed to see product surface whether there is.Room temperature tensile strength is according to national standard
The regulation of GB2684 carries out；The test temperature of burning decrement is 1000 DEG C, time 30min；Particle diameter uses shake pendulum-type sand sieving machine
Tested.Testing result shows it with extraordinary resistance to elevated temperatures, the high temperature of 1700 DEG C of ability, its room temperature tensile strength
Reach 6.8MPa, burning decrement 4.3%, the particle diameter of precoated sand is 100~140 mesh, and AFS values are 72.
By the precoated sand obtained in embodiment 2 after curing at a temperature of 250 DEG C, it is examined using metallographic microscope
Survey, it is as shown in Figure 2 to obtain its crystalline phase microscope figure.As shown in Figure 2, roughing sand particle diameter is fine and smooth, particle diameter between 75 μm~150 μm,
The phenolic resin of the present embodiment selection overlays on tightly and uniformly roughing sand surface, the product dense uniform produced.With this reality
The product dense uniform that a precoated sand is produced is applied, high temperature resistant, intensity is high, can be widely applied to molten steel sensor industry.
Embodiment 3
The precoated sand includes by weight：
The roughing sand is the mixture (mass ratio 4 of silica sand, magnesia and emergy:1:1), SiO in silica sand2Content is up to
99%, the bonding agent is phenolic resin, and the curing agent is methenamine, and the coupling agent is silane coupling agent KH560, institute
It is calcium stearate to state lubricant.
The performance of precoated sand to being obtained in embodiment 3 is detected, and detection method is as follows：The detection of resistance to elevated temperatures is
Product is used in 1720 DEG C of molten steel, stops 20 seconds, it is defeated and dispersed to see product surface whether there is.Room temperature tensile strength is according to national standard
The regulation of GB2684 carries out；The test temperature of burning decrement is 1000 DEG C, time 30min；Particle diameter uses shake pendulum-type sand sieving machine
Tested.Testing result shows it with extraordinary resistance to elevated temperatures, the high temperature of 1720 DEG C of ability, its room temperature tensile strength
Reach 6.3MPa, burning decrement 4.0%, the particle diameter of precoated sand is 80~140 mesh, and AFS values are 69.
By the precoated sand obtained in embodiment 3 after curing at a temperature of 250 DEG C, it is examined using metallographic microscope
Survey, it is as shown in Figure 3 to obtain its crystalline phase microscope figure.From the figure 3, it may be seen that roughing sand particle diameter is fine and smooth, particle diameter between 100 μm~180 μm,
The phenolic resin of the present embodiment selection overlays on tightly and uniformly roughing sand surface, the product dense uniform produced.With this reality
The product dense uniform that a precoated sand is produced is applied, high temperature resistant, intensity is high, can be widely applied to molten steel sensor industry.
Embodiment 4
The precoated sand includes by weight：
The roughing sand is silica sand and the mixture (mass ratio 5 of emergy:1), wherein silica sand is sea sand, SiO2Content is high
Up to 99%, the bonding agent is phenolic resin, and the curing agent is methenamine, and the coupling agent is Silane coupling agent KH550,
The lubricant is calcium stearate.
The performance of precoated sand to being obtained in embodiment 4 is detected, and detection method is as follows：The detection of resistance to elevated temperatures is
Product is used in 1735 DEG C of molten steel, stops 20 seconds, it is defeated and dispersed to see product surface whether there is.Room temperature tensile strength is according to national standard
The regulation of GB2684 carries out；The test temperature of burning decrement is 1000 DEG C, time 30min；Particle diameter uses shake pendulum-type sand sieving machine
Tested.Testing result shows it with extraordinary resistance to elevated temperatures, the high temperature of 1735 DEG C of ability, its room temperature tensile strength
Reach 6.0MPa, burning decrement 3.95%, the particle diameter of precoated sand is 90~140 mesh, and AFS values are 71.
By the precoated sand obtained in embodiment 4 after curing at a temperature of 250 DEG C, it is examined using metallographic microscope
Survey, it is as shown in Figure 4 to obtain its crystalline phase microscope figure.As shown in Figure 4, roughing sand particle diameter is fine and smooth, particle diameter between 100 μm~160 μm,
The phenolic resin of the present embodiment selection overlays on tightly and uniformly roughing sand surface, the product dense uniform produced.With this reality
The product dense uniform that a precoated sand is produced is applied, high temperature resistant, intensity is high, can be widely applied to molten steel sensor industry.
Comparative example 1
The precoated sand includes by weight：
Roughing sand is common river sand, and particle diameter is 50~80 mesh, and bonding agent is phenolic resin, and the curing agent is methenamine,
The coupling agent is silane coupling agent KH570, and the lubricant is calcium stearate, its room temperature tensile strength is only 3.8MPa, is burnt
3.5% is reduced to, resistance to elevated temperatures only has 1600 DEG C, using easily defeated and dispersed in molten steel.It can not be applied to molten steel sensor industry.
Comparative example 2
The precoated sand includes by weight：
Roughing sand is husky for common regeneration, and particle diameter is 60~80 mesh, and bonding agent is phenolic resin, and the curing agent is Wu Luotuo
Product, the coupling agent are silane coupling agent KH570, and the lubricant is calcium stearate, its room temperature tensile strength can up to be
7.2MPa, igloss amount 4.6%, resistance to elevated temperatures have 1680 DEG C, defeated and dispersed using being not easy in molten steel.But since bonding agent contains
Amount increases.Product tends to stick to production mould in production, and produces substantial amounts of gas, and product easily produces stomata, at the same time
Not easy mold release, influences the efficiency produced in enormous quantities.Therefore molten steel sensor industry can not be also applied to.
Claims (10)
- A kind of 1. precoated sand, it is characterised in that including：
- 2. precoated sand according to claim 1, it is characterised in that the roughing sand is selected from silica sand, magnesia, zircon sand and emergy In one or more.
- 3. precoated sand according to claim 1, it is characterised in that sea sand of the roughing sand in silica sand.
- 4. precoated sand according to claim 1, it is characterised in that the binding agent be selected from phenolic resin, epoxy resin with One or more in phenol-formaldehyde resin modified.
- 5. precoated sand according to claim 1, it is characterised in that the curing agent be selected from hexa, polyformaldehyde, Trihydroxy phenol and the one or more in polyhydroxymethyl melamine.
- 6. precoated sand according to claim 1, it is characterised in that the coupling agent is selected from silane coupling agent.
- 7. precoated sand according to claim 1, it is characterised in that the lubricant is selected from calcium stearate.
- 8. precoated sand according to claim 1, it is characterised in that the mesh number of the roughing sand is 70~140 mesh.
- 9. precoated sand according to claim 1, it is characterised in that the AFS coefficients of the precoated sand are 68~72.
- 10. precoated sand according to claim 1, it is characterised in that the resistance to elevated temperatures of the precoated sand for 1600 DEG C~ 1700℃；Room temperature tensile strength is more than or equal to 6MPa；Burning decrement is 4.2%~4.5%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711374308.2A CN107913975A (en) | 2017-12-19 | 2017-12-19 | A kind of precoated sand |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711374308.2A CN107913975A (en) | 2017-12-19 | 2017-12-19 | A kind of precoated sand |
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| CN107913975A true CN107913975A (en) | 2018-04-17 |
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| CN201711374308.2A Pending CN107913975A (en) | 2017-12-19 | 2017-12-19 | A kind of precoated sand |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110340277A (en) * | 2019-07-09 | 2019-10-18 | 江阴天润造型材料科技有限公司 | A kind of precoated sand and the preparation method and application thereof for potassium steel with Sand sticking-resistant characteristic |
| CN110523913A (en) * | 2019-08-31 | 2019-12-03 | 新疆泰格迪木国际贸易有限公司 | A kind of preparation method of high intensity 3D printing precoated sand |
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