CN108672648A - A kind of casting sand type binder, preparation method and application - Google Patents
A kind of casting sand type binder, preparation method and application Download PDFInfo
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- CN108672648A CN108672648A CN201810598680.XA CN201810598680A CN108672648A CN 108672648 A CN108672648 A CN 108672648A CN 201810598680 A CN201810598680 A CN 201810598680A CN 108672648 A CN108672648 A CN 108672648A
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- Prior art keywords
- binder
- sand
- casting
- type binder
- casting sand
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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
- 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
- B22C1/167—Mixtures of inorganic and organic binding agents
Abstract
A kind of casting sand type binder of present invention offer, preparation method and application.The casting sand type binder of the present invention, each raw material component are as follows by weight percentage：Sodium silicate 1 90%, potassium water glass 1 90%, lithium silicate 1%, dextrin 0.5%, sodium carboxymethylcellulose 0.5%, sodium alginate 0.5%, carbon dioxide hardening phenolic resin 0.5%, water 3%.Binder of the present invention carries out inorganic binder with organic binder compound, and when use can be used carbon dioxide and be hardened, and harden fast and easy, normal temperature strength is up to 1MPa or more within 24 hours.The wet strength (up to 0.2MPa) of molding sand is improved, while intensity of the molding sand after high temperature casting being made to be less than 0.6MPa, significantly improves the collapsibility of molding sand.The present invention by waterglass and resin by, by specific components selection and proportions, obtaining not only environmental protection but also the molding sand binder with good collapsibility performance.
Description
Technical field
The invention belongs to casting and molding field, particularly relates to the moulding sand binder in casting and molding field, prepares
Method and application.
Background technology
At present in casting and molding field, moulding sand binder is broadly divided into two major classes：Inorganic binder and organic binder.Nothing
Machine binder is to make binder as main component with waterglass.Organic binder is based on furane resins, phenolic resin etc.
Want the binder of ingredient
But all there is certain disadvantage in the binder of both types.Organic binder is big with penetrating odor, casts
Process generates the shortcomings of serious a large amount of toxic gas, environmental pollution and organic resin higher price so that organic binder
Use limited by larger.And the inorganic binder based on waterglass then have do not generate irritation toxic gas, nothing
Black pollution, cheap advantage.But the sand mold that molding sand is prepared using waterglass as binder is using process
It is middle that there are two hang-ups：On the one hand, binder generates ceramic phase by high temperature sintering after sand mold cast, causes the collapsibility of molding sand
It is deteriorated, casting cleaning is extremely difficult；On the other hand, used old sand caking is serious, intensity is very high, recycles very
Difficulty, general old sand can only be used as solid waste discharge, and the old sand of these cakings is difficult to decompose, to cause serious ring
It pollutes in border.
In order to solve to use in the prior art, the sand mold collapsibility of sodium silicate binder is poor, is difficult to asking for recycling
Waterglass and resin are usually used in mixed way by topic, those skilled in the art, and resin demand is larger, so this method is not abundant
The environmentally protective advantage of sodium silicate binder is embodied, while can also bring resinoid bond is expensive, environmental pollution is serious etc. into
Numerous defects.
Therefore improve waterglass and resin are used in mixed way in the prior art during there are the shortcomings that, a kind of both rings are provided
The molding sand binder for protecting and having good collapsibility performance, is still the target to be pursued of those skilled in the art.
Invention content
The present invention in view of the above shortcomings of the prior art, provides and a kind of waterglass and resin is passed through specific components and ratio
Proportioning obtains not only environmental protection but also the molding sand binder with good collapsibility performance.
The technical solution adopted by the present invention is：A kind of casting sand type binder, each raw material component are by weight percentage：
Sodium silicate 1-90%, potassium water glass 1-90%, lithium silicate 1%, dextrin 0.5%, sodium carboxymethylcellulose
0.5%, sodium alginate 0.5%, carbon dioxide hardening phenolic resin 0.5%, water 3%.The sum of each component dosage is 100.
Preferably, the sodium silicate is the sodium silicate of 50 ° of 2.5 Baume degrees of modulus；The potassium water glass is modulus 2.5
The potassium water glass that 50 ° of Baume degrees.The lithium silicate modulus (m) is 4.8.
Preferably, the sodium silicate weight percent is 10-90%, potassium water glass weight percent is 4-84%.
The preparation method of binder of the present invention is：Using the method for mixing, raw material is weighed in sequence, is added under room temperature
It is stirred and evenly mixed in blender.Environment temperature is 15-30 DEG C when stirring.
The present invention also provides the casting sand type binders using the silica sand of silicon content >=98% or nice foundry sand as type
Application in the casting and molding of sand.The weight proportion of the molding sand and binder is 100：1~5.
The application method of binder of the present invention is：Silica sand or nice foundry sand using silicon content more than or equal to 98% as molding sand,
Accounted for according to binder molding sand 1-5% ratio carry out proportioning form sand formulation.Specific method：Weigh silica sand or nice foundry sand
100kg is added sand mixer, then weighs binder 1-5kg；Binder is slowly added in molding sand, while binder is added
Mulling stirring is carried out, until stirring evenly.
Binder of the present invention is compound with organic binder progress by inorganic binder, and carbon dioxide can be used and hardened,
Fast and easy is hardened, 24 hours normal temperature strengths have additionally incorporated dextrin, sodium carboxymethylcellulose, alginic acid up to 1MPa or more
Sodium improves the wet strength (up to 0.2MPa) of molding sand, while intensity of the molding sand after high temperature casting being made to be less than 0.6MPa, significantly
Improve the collapsibility of molding sand.
The present invention has the advantages that：
1, the collapsibility for solving existing inorganic binder molding sand is poor, and molding sand cleaning is difficult, and reclamation of return sand is difficult, has a large amount of
The problem of antiquated sand discharges.
Using sodium silicate, potassium water glass, lithium silicate as binder, dextrin, sodium carboxymethylcellulose, alginic acid
Sodium, carbon dioxide hardening phenolic resin are selected high refractoriness molding sand to form suitable molding sand proportion, were both reached as modified material
Higher normal temperature strength meets moulding use, and organic resin scaling loss a small amount of in binder is so as to improve type after molten metal casting
The collapsibility (intensity i.e. after high temperature casting is less than 0.6MPa) of sand, makes old sand have reuse performance, reduces the discharge of antiquated sand.
2, without air pollution, generation and the emission problem of existing organic binder toxic gas are solved.
The present invention is using sodium silicate, potassium water glass, lithium silicate as binder, dextrin, sodium carboxymethylcellulose, sea
Mosanom, carbon dioxide hardening phenolic resin are obtained as modified material, formula and dosage by developing meticulously.Carbon dioxide is hard
Change phenolic resin dosage is few, and the decomposition to which toxic gas be greatly lowered in high temperature casting process generates and discharge.It is real
It tramples and shows to be nearly free from toxic gas in practical casting process, molding sand can recycle.
3, cost is relatively low.
The method of the present invention old sand can recycle, while amounts of organic binder is few, and cost is greatly reduced；And it is used
Inorganic binder cost is relatively low, therefore, greatly reduces moulding cost on the whole, is more suitable for industrialized production and application.
Specific implementation mode
Technical scheme of the present invention and technique effect are described further with reference to specific embodiment and test example, under
State bright should not be construed as limiting the invention.Sodium silicate is the sodium of 50 ° of 2.5 Baume degrees of modulus in various embodiments of the present invention
Waterglass；Potassium water glass is the potassium water glass of 50 ° of 2.5 Baume degrees of modulus；Lithium silicate modulus (m) is 4.8, and each raw material is city
Sell finished product (such as lithium silicate may be used Qingdao excellent rope chemistry Science and Technology Ltd. production modulus 4.8 lithium metasilicate production
Product), commercially obtain.
Embodiment 1, a kind of casting sand type are named A with binder, and each raw material component is as follows by weight ratio：Sodium silicate
10%, potassium water glass 84%, lithium silicate 1%, dextrin 0.5%, sodium carboxymethylcellulose 0.5%, sodium alginate 0.5%, two
Carbonoxide hardening phenolic resin 0.5%, water 3%.
It prepares and uses mixing method, weigh raw material in sequence, be added in blender and stir and evenly mix.When stirring
Environment temperature is 15-30 DEG C.
Embodiment 2, a kind of casting sand type are named B with binder, and each raw material component is as follows by weight ratio：Sodium silicate
30%, potassium water glass 64%, lithium silicate 1%, dextrin 0.5%, sodium carboxymethylcellulose 0.5%, sodium alginate 0.5%, two
Carbonoxide hardening phenolic resin 0.5%, water 3%.
The preparation method is the same as that of Example 1 for binder of the present invention.
Embodiment 3, a kind of casting sand type are named C with binder, and each raw material component is as follows by weight ratio：Sodium silicate
50%, potassium water glass 44%, lithium silicate 1%, dextrin 0.5%, sodium carboxymethylcellulose 0.5%, sodium alginate 0.5%, two
Carbonoxide hardening phenolic resin 0.5%, water 3%.
The preparation method is the same as that of Example 1 for binder of the present invention.
Embodiment 4, a kind of casting sand type are named D with binder, and each raw material component is as follows by weight ratio：Sodium silicate
70%, potassium water glass 24%, lithium silicate 1%, dextrin 0.5%, sodium carboxymethylcellulose 0.5%, sodium alginate 0.5%, two
Carbonoxide hardening phenolic resin 0.5%, water 3%.
The preparation method is the same as that of Example 1 for binder of the present invention.
Embodiment 5, a kind of casting sand type are named E with binder, and each raw material component is as follows by weight ratio：Sodium silicate
90%, potassium water glass 4%, lithium silicate 1%, dextrin 0.5%, sodium carboxymethylcellulose 0.5%, sodium alginate 0.5%, dioxy
Change carbon hardening phenolic resin 0.5%, water 3%.
The preparation method is the same as that of Example 1 for binder of the present invention.
Test example
1, respectively to the binder obtained using embodiment 1-5, silica sand or nice foundry sand with silicon content more than or equal to 98%
As molding sand, the ratio that molding sand 1-5% is accounted for according to binder carries out matching and forms sand formulation, in sand mixer, by binder
It is slowly added in molding sand, is carried out at the same time stirring, until stirring evenly, the sand core of preparation carries out intensity detection and collapsibility is surveyed
Examination.
Experiment condition is：The method of intensity detection is with reference to GB2684-81《Foundry sand and test mixture method》,
Specific experimental design and preparation process are shown in Table 1：
Table 1
2, using binder A-E, the corresponding dog-bone being prepared is C1-C5 respectively, tensile strength and collapsibility
Can and preparation process in the test results such as harmful gas emission be shown in Table 2.
Table 2
Curing：Carbon dioxide flow 1.5m3/ hour.
3, it after removing excessive moisture by sand mold C1-C5 bakings all defeated and dispersed after water spray, shakes out, leads to after re-mixing 3 minutes
It crosses the air blowing of MLA1 core making machines and is pressed into 50 × 50 test blocks of resistance to compression Ф, after resistance to compression test block placement being made 24 hours, place it in difference
20 minutes are kept the temperature in the DC-B8/12 Intelligent box type high temperature furnaces of temperature, taking-up is cooled to room temperature, and is surveyed it and is remained compression strength, as a result
It is shown in Table 3.
Table 3
Claims (9)
1. a kind of casting sand type binder, characterized in that each raw material component is by weight percentage：Sodium silicate 1-90%,
Potassium water glass 1-90%, lithium silicate 1%, dextrin 0.5%, sodium carboxymethylcellulose 0.5%, sodium alginate 0.5%, titanium dioxide
Carbon hardening phenolic resin 0.5%, water 3%.
2. casting sand type binder as described in claim 1, characterized in that the sodium silicate weight percent is 10-
90%.
3. casting sand type binder as described in claim 1, characterized in that the potassium water glass weight percent is 4-
84%.
4. casting sand type binder as described in claim 1, characterized in that the sodium silicate is 2.5 Baume degrees of modulus
50 ° of sodium silicate.
5. casting sand type binder as described in claim 1, characterized in that the potassium water glass is 2.5 Baume degrees of modulus
50 ° of potassium water glass.
6. the method for preparing casting sand type binder described in claim 1, characterized in that use mixing method：According to
Sequence weighs raw material, is added in blender and stirs and evenly mixs under room temperature.
7. preparation method as claimed in claim 6, characterized in that environment temperature is 15-30 DEG C when stirring.
8. casting sand type binder described in claim 1 is using the silica sand of silicon content >=98% or nice foundry sand as the casting of molding sand
Application in moulding.
9. application as claimed in claim 8, characterized in that the weight proportion of the molding sand and binder is 100：1~5.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810598680.XA CN108672648A (en) | 2018-06-12 | 2018-06-12 | A kind of casting sand type binder, preparation method and application |
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| CN201810598680.XA CN108672648A (en) | 2018-06-12 | 2018-06-12 | A kind of casting sand type binder, preparation method and application |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110732630A (en) * | 2019-11-25 | 2020-01-31 | 武汉绿之美铸造材料有限公司 | inorganic composite adhesive for casting exothermic riser |
| CN112317679A (en) * | 2020-11-07 | 2021-02-05 | 郑州远东耐火材料有限公司 | Novel modified resin adhesive special for sand mold of fused brick and preparation method thereof |
| CN113333675A (en) * | 2021-05-28 | 2021-09-03 | 盐城大丰赛维铸造科技有限公司 | Manufacturing process and special equipment of inorganic vacuum shell mold for casting |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110732630A (en) * | 2019-11-25 | 2020-01-31 | 武汉绿之美铸造材料有限公司 | inorganic composite adhesive for casting exothermic riser |
| CN112317679A (en) * | 2020-11-07 | 2021-02-05 | 郑州远东耐火材料有限公司 | Novel modified resin adhesive special for sand mold of fused brick and preparation method thereof |
| CN113333675A (en) * | 2021-05-28 | 2021-09-03 | 盐城大丰赛维铸造科技有限公司 | Manufacturing process and special equipment of inorganic vacuum shell mold for casting |
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Application publication date: 20181019 |