CN102652982A - Lost foam casting coating additive - Google Patents

Lost foam casting coating additive Download PDF

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Publication number
CN102652982A
CN102652982A CN2012101425993A CN201210142599A CN102652982A CN 102652982 A CN102652982 A CN 102652982A CN 2012101425993 A CN2012101425993 A CN 2012101425993A CN 201210142599 A CN201210142599 A CN 201210142599A CN 102652982 A CN102652982 A CN 102652982A
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CN
China
Prior art keywords
coating
lost foam
additive
foam casting
casting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN2012101425993A
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Chinese (zh)
Inventor
苏怡宁
王文海
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hebei Jikai Casting Industry Co Ltd
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Hebei Jikai Casting Industry Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hebei Jikai Casting Industry Co Ltd filed Critical Hebei Jikai Casting Industry Co Ltd
Priority to CN2012101425993A priority Critical patent/CN102652982A/en
Publication of CN102652982A publication Critical patent/CN102652982A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a lost foam casting coating additive comprising the following components in percentage by mass: 2-6% of inorganic binder, 2-6% of organic resin binder, 2.5-5.5% of composite suspending agent and the balance of water, wherein the inorganic binder is silicasol; the organic resin binder is polyvinyl acetate resin; and the composite suspending agent is a mixture consisting of 0.5-1.5% of bentonite, 1-2% of carboxymethyl cellulose sodium and 1-2% of attapulgite in percentage by mass. By means of the lost foam casting coating additive disclosed by the invention, problems of requirements of lost foam shell vibration pouring process on strength and air permeability of coating are solved; after the additive disclosed by the invention is added, the air permeability of a coating layer is improved, the lost foam is fully burned, the casting slag inclusion and the local recarburization tendency are reduced; moreover, the strength of the coating layer is increased to guarantee that the coating has no crack and the pouring has no collapse during the shell vibration pouring.

Description

The lost foam casting coating additive
Technical field
The present invention relates to a kind of additive of field of metallurgy, a kind of specifically high performance additive that is used for lost foam casting coating.
Background technology
Lost foam casting is that paraffin similar with the casting dimension shape or bubbles model bonding are combined into model cluster; After brushing fireproof coating and oven dry; Be embedded in vibration molding in the dried quartz sand, under negative pressure, pour into a mould, make the model gasification; Liquid metals occupies modal position, solidifies the novel casting method that the cooling back forms foundry goods.Lost foam casting process adopts direct pouring type mostly at present, does not burn mould before the cast, does not shake during cast, and is therefore higher to the intensity and the gas permeability requirements of coating.Common lost foam paint, brushing back intensity is low, and the crush situation often appears in the ghost vibration casting.Address this is that, dual mode is generally arranged.
First kind is to increase apperance brushing number of times, relies on the mode that increases paint thickness to improve its intensity.But after coating thickens, the gas permeability of coating is reduced, cause the ghost cast before, the gas that the apperance burning produces can not in time be drained, the apperance burning is insufficient, cause cast after, defectives such as slag inclusion, local carburetting appear in foundry goods; After the coating thickening, also can cause the foundry goods heat radiation slow in addition, casting crystalline grain degree grade is descended, influence the mechanical property of foundry goods.
Another kind of mode is the granularity that reduces the coating aggregate, and by the concentrated intensity that adopts the granule aggregate to improve coating, but this also can reduce the gas permeability of coating, makes foundry goods above-mentioned defective occur.
Summary of the invention
The technical issues that need to address of the present invention provide a kind of lifting dope layer gas permeability, the apperance sufficient combustion, and foundry goods slag inclusion, local carburetting tendency reduce; Simultaneously dope layer intensity improves, and when guaranteeing the ghost vibration casting, the coating crack-free, pours into a mould the not lost foam casting coating additive of crush.
For solving the problems of the technologies described above, the technical scheme that the present invention adopted is:
The lost foam casting coating additive, its component and quality percentage composition are: inorganic binder 2~6%, organic resin binding agent 2~6%, composite suspension agent 2.5~5.5%, surplus are water.
Further improvement of the present invention is: said inorganic binder is a Ludox; Said organic resin binding agent is a polyvinyl acetate resin, and said composite suspension agent is that the quality percentage composition is that 0.5~1.5% bentonite, quality percentage composition are that 1~2% sodium cellulose glycolate, quality percentage composition are the mixture of 1~2% attapulgite.
Because the technological progress of having adopted technique scheme, the present invention to obtain is:
The present invention is as additive; When the preparation fireproof coating, use, a certain proportion of lost foam casting coating additive is sneaked in the fireproof coating, rolling is 5~6 hours in rotary mixer; After making it mix, roll evenly with coating, can carry out apperance brushing work.After experiment showed, that common coating adds this high-performance additives when mixing system, intensity, gas permeability all are significantly improved.The ghost vibration casting, when the sandbox internal negative pressure was 0.045MPa, breaking did not appear in coating, still can pour into a mould smoothly; The coating gas permeability improves, and apperance can fully be burnt, and the casting mold inner chamber does not have the black glaze that adheres to, and foundry goods does not have defectives such as slag inclusion, local carburetting.The present invention solves lost foam hollow-shell vibration casting technology to the intensity of coating, the problem of gas permeability requirements.After adding additive of the present invention, promoted the dope layer gas permeability, the apperance sufficient combustion, foundry goods slag inclusion, local carburetting tendency reduce; Simultaneously dope layer intensity improves, and when having guaranteed the ghost vibration casting, the coating crack-free, pours into a mould not crush.The invention solves this contradictory problems of coating intensity and gas permeability, comprehensively improved coating elevated temperature strength and gas permeability, make common coating also can satisfy the requirement of ghost vibration casting.
The Ludox of said inorganic binder connects to a chain earlier in gelatinization, the branch chain connects into the three-dimensional network system again, can improve the intensity of coating under the condition of high temperature.
Bentonite in the said composite suspension agent has very strong hygroscopicity, has good thickening, thixotropy, suspension stability, high-temperature stability, lubricity, film forming, resistance to water and chemical stability.Sodium cellulose glycolate (CMC) is odorless, tasteless almost, and the tool hygroscopicity is easy to be dispersed in the transparent colloidal solution of one-tenth in the water, and the solid of coating is distributed in the solvent equably, makes coating not stratified for a long time.Attapulgite stirs good dispersion down in external force, form stable not by the suspension of electrolyte destruction, make coating do not precipitate, not stratified, it is good to have the brushing performance, not the characteristics of sagging.The bentonite water-swellable forms the aquation mould, and is overlapped to form space network, makes coating produce yield value, promotes the suspension of coating; Bentonite clay particle is also adsorbed by the polymer chemistry key of sodium cellulose glycolate simultaneously, produces " bridging " effect, makes the space network of formation stable more, firm, thereby makes suspension better.
The organic binder bond particle, the analysis of being heated when running into high temperature, gasification stay a large amount of cavities in coating, thereby can improve the gas permeability of coating when burning mould, cast; Because this organic granular material combustion decomposes steadily, can not cause the peeling and the breakage of coating in addition, therefore can not reduce the intensity of dope layer.
The specific embodiment
Below in conjunction with embodiment the present invention is explained further details:
Embodiment 1
The lost foam casting coating additive, its component and quality percentage composition are: Ludox 2%, polyvinyl acetate resin 2%, bentonite 0.5%, sodium cellulose glycolate 1%, attapulgite 1%, water 93.5%.
Embodiment 2
The lost foam casting coating additive, its component and quality percentage composition are: Ludox 6%, polyvinyl acetate resin 6%, bentonite 1.5%, sodium cellulose glycolate 2%, attapulgite 2%, water 82.5%.
Embodiment 3
The lost foam casting coating additive, its component and quality percentage composition are: Ludox 3%, polyvinyl acetate resin 5%, bentonite 1%, sodium cellulose glycolate 1.5%, attapulgite 1.5%, water 88%.
Embodiment 4
The lost foam casting coating additive, its component and quality percentage composition are: Ludox 5%, polyvinyl acetate resin 3%, bentonite 1.2%, sodium cellulose glycolate 1.7%, attapulgite 1.3%, water 87.8%.
Embodiment 5
The lost foam casting coating additive, its component and quality percentage composition are: Ludox 4%, polyvinyl acetate resin 4%, bentonite 0.8%, sodium cellulose glycolate 1.2%, attapulgite 1.6%, water 88.4%.
Embodiment 6
The lost foam casting coating additive, its component and quality percentage composition are: Ludox 3.8%, polyvinyl acetate resin 5.5%, bentonite 1.3%, sodium cellulose glycolate 1.8%, attapulgite 1.1%, water 86.5%.
 
The foregoing description is experimentized; When the preparation fireproof coating, use, a certain proportion of lost foam casting coating additive is sneaked in the fireproof coating, rolling is 5~6 hours in rotary mixer; After making it mix, roll evenly with coating, can carry out apperance brushing work.After experiment showed, that common coating adds this high-performance additives when mixing system, intensity, gas permeability all are significantly improved.The ghost vibration casting, when the sandbox internal negative pressure was 0.045MPa, breaking did not appear in coating, still can pour into a mould smoothly; The coating gas permeability improves, and apperance can fully be burnt, and the casting mold inner chamber does not have the black glaze that adheres to, and foundry goods does not have defectives such as slag inclusion, local carburetting.
Bentonite water-swellable in the additive of the present invention forms the aquation mould, and is overlapped to form space network, makes coating produce yield value, promotes the suspension of coating; Bentonite clay particle is also adsorbed by the polymer chemistry key of sodium cellulose glycolate simultaneously, produces " bridging " effect, makes the space network of formation stable more, firm, thereby makes suspension better.
Composite suspension agent in the additive of the present invention forms very strong chemical bond in coating, constitute space network, makes coating have higher intensity.On the other hand, the Ludox of inorganic binder connects to a chain earlier in gelatinization, and the branch chain connects into the three-dimensional network system again, can improve the intensity of coating under the condition of high temperature.
Organic binder bond particle in the additive of the present invention, the analysis of being heated when running into high temperature, gasification stay a large amount of cavities in coating, thereby can improve the gas permeability of coating when burning mould, cast; Because this organic granular material combustion decomposes steadily, can not cause the peeling and the breakage of coating in addition, therefore can not reduce the intensity of dope layer.

Claims (2)

1. lost foam casting coating additive, it is characterized in that: its component and quality percentage composition are: inorganic binder 2~6%, organic resin binding agent 2~6%, composite suspension agent 2.5~5.5%, surplus are water.
2. lost foam casting coating additive according to claim 1; It is characterized in that: said inorganic binder is a Ludox; Said organic resin binding agent is a polyvinyl acetate resin, and said composite suspension agent is that the quality percentage composition is that 0.5~1.5% bentonite, quality percentage composition are that 1~2% sodium cellulose glycolate, quality percentage composition are the mixture of 1~2% attapulgite.
CN2012101425993A 2012-05-10 2012-05-10 Lost foam casting coating additive Pending CN102652982A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2012101425993A CN102652982A (en) 2012-05-10 2012-05-10 Lost foam casting coating additive

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2012101425993A CN102652982A (en) 2012-05-10 2012-05-10 Lost foam casting coating additive

Publications (1)

Publication Number Publication Date
CN102652982A true CN102652982A (en) 2012-09-05

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CN2012101425993A Pending CN102652982A (en) 2012-05-10 2012-05-10 Lost foam casting coating additive

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CN (1) CN102652982A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104550679A (en) * 2014-12-29 2015-04-29 三峡大学 Environment-friendly alcohol-based coating for sand mold casting
CN106519828A (en) * 2016-10-10 2017-03-22 佛山市高明区明城镇新能源新材料产业技术创新中心 Fragrance additive for fluorocarbon paints and preparation method thereof
CN106519932A (en) * 2016-10-10 2017-03-22 佛山市高明区明城镇新能源新材料产业技术创新中心 Water-borne alkyd resin paint additive, preparation method and use method thereof
CN107716862A (en) * 2017-09-01 2018-02-23 东风精密铸造安徽有限公司 A kind of lost foam hollow-shell mold and pattern for casting sample vanning technique method
CN108246969A (en) * 2018-01-29 2018-07-06 济宁市天狮涂料有限公司 A kind of low addition lost foam paint multifunction additive

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN86106485A (en) * 1986-10-03 1988-04-13 刘汉生 Water based iron casting paint
JP4153689B2 (en) * 2001-10-19 2008-09-24 株式会社ツチヨシアクティ Manufacturing method of casting mold
CN102078914A (en) * 2009-11-26 2011-06-01 王可新 Tin alloy metal mold casting paint and preparation method thereof
CN102179472A (en) * 2011-03-14 2011-09-14 何剑锋 Ductile iron coating for lost foam casting, and preparation method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN86106485A (en) * 1986-10-03 1988-04-13 刘汉生 Water based iron casting paint
JP4153689B2 (en) * 2001-10-19 2008-09-24 株式会社ツチヨシアクティ Manufacturing method of casting mold
CN102078914A (en) * 2009-11-26 2011-06-01 王可新 Tin alloy metal mold casting paint and preparation method thereof
CN102179472A (en) * 2011-03-14 2011-09-14 何剑锋 Ductile iron coating for lost foam casting, and preparation method thereof

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104550679A (en) * 2014-12-29 2015-04-29 三峡大学 Environment-friendly alcohol-based coating for sand mold casting
CN104550679B (en) * 2014-12-29 2017-03-15 三峡大学 A kind of sand casting environment-friendly type alcohol-base paint
CN106519828A (en) * 2016-10-10 2017-03-22 佛山市高明区明城镇新能源新材料产业技术创新中心 Fragrance additive for fluorocarbon paints and preparation method thereof
CN106519932A (en) * 2016-10-10 2017-03-22 佛山市高明区明城镇新能源新材料产业技术创新中心 Water-borne alkyd resin paint additive, preparation method and use method thereof
CN107716862A (en) * 2017-09-01 2018-02-23 东风精密铸造安徽有限公司 A kind of lost foam hollow-shell mold and pattern for casting sample vanning technique method
CN108246969A (en) * 2018-01-29 2018-07-06 济宁市天狮涂料有限公司 A kind of low addition lost foam paint multifunction additive

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Application publication date: 20120905

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