CN106270373B - A kind of precoated sand sand mold alcohol-base foundry coating and preparation method thereof - Google Patents

A kind of precoated sand sand mold alcohol-base foundry coating and preparation method thereof Download PDF

Info

Publication number
CN106270373B
CN106270373B CN201610855235.8A CN201610855235A CN106270373B CN 106270373 B CN106270373 B CN 106270373B CN 201610855235 A CN201610855235 A CN 201610855235A CN 106270373 B CN106270373 B CN 106270373B
Authority
CN
China
Prior art keywords
coating
ethyl alcohol
alcohol
sand
sand mold
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.)
Active
Application number
CN201610855235.8A
Other languages
Chinese (zh)
Other versions
CN106270373A (en
Inventor
夏露
张友寿
晏骏玮
黄晋
龙威
李四年
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.)
Hubei University of Technology
Original Assignee
Hubei University of Technology
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 Hubei University of Technology filed Critical Hubei University of Technology
Priority to CN201610855235.8A priority Critical patent/CN106270373B/en
Publication of CN106270373A publication Critical patent/CN106270373A/en
Application granted granted Critical
Publication of CN106270373B publication Critical patent/CN106270373B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22CFOUNDRY MOULDING
    • B22C3/00Selection of compositions for coating the surfaces of moulds, cores, or patterns

Abstract

The invention discloses a kind of precoated sand sand mold alcohol-base foundry coatings and preparation method thereof, belong to paint field.Coating of the present invention includes following component by mass percentage:400~600 mesh refractory powders 63~67%, sodium bentonite 1.0~1.4%, calcium-base bentonite 1.6~2.3%, thermosetting phenolic resin 1.2~1.8%, polyvinyl butyral 0.6~0.9%, ethyl alcohol 28~31%.Raw material in addition to ethyl alcohol is mixed in proportion and is added in kolleroang, the ethyl alcohol for accounting for ethyl alcohol gross mass 45~55% is added in, paste coating is obtained after abundant mixed grind;Paste coating taking-up is put into agitator again, remaining ethyl alcohol is added in, stirs evenly to get coating finished product.Coating of the present invention has high suspensibility, high solid content, low drying distortions amount and very strong covering power, and paint brush sense and levelability are very good, and coating is bright and clean, good permeability, institute's pouring cast part any surface finish.

Description

A kind of precoated sand sand mold alcohol-base foundry coating and preparation method thereof
Technical field
The invention belongs to paint fields, and in particular to a kind of precoated sand sand mold alcohol-base foundry coating and preparation method thereof.
Background technology
Precoated sand casting technique and investment precision casting technology ratio, with short production cycle, production procedure simplifies, due to precoated sand Roughing sand grain shape used is good, and sand grains is thinner, and mould surface roughness is low, therefore is a kind of accurate or half precision casting molding method, But the level of traditional investment precision casting technology is still not achieved in surface quality of continuous castings, and the producer, which is desirable for coating, can improve casting Part surface quality.But many common resin sands or water-glass sand mo(u)ld blacking can not meet this requirement in the market, such as common Coating particles are thick, and brush sense is bad, and brush mark weight, levelability is poor, pouring cast part after coating, and do not have not only and improve cast(ing) surface light The effect of cleanliness, originally smooth casting mold is made to become rough instead causes cast(ing) surface more coarse, and traditional coating is breathed freely The characteristics of property is poor, precoated sand is that sand grains is thin, and gas forming amount is big, poor air permeability, if coating does not have good gas permeability, precoated sand Part is easy to generate gas class defect.Therefore, it is desirable to there is a kind of preferable coating that can meet above-mentioned requirements, and by brushing method, Very bright and clean mo(U)ld face is obtained, the horizontal casting for reaching precision-investment casting is outpoured so as to pour.
Invention content
It is an object of the invention to overcome shortcoming and deficiency of the existing technology, provide it is a kind of can prevent casting scab and Improve the precoated sand sand mold alcohol-base foundry coating of surface finish of casting.The paint brush sense is good, brushes repeatedly and does not leave brush mark, point Fire drying is not blistering, and coating's permeability is good, and the mo(U)ld face roughness after brushing paint reduces, the steel casting surface quality of cast It greatly improves.The present invention also aims to provide the preparation method of the coating.
The purpose of the present invention is achieved through the following technical solutions:
A kind of precoated sand sand mold alcohol-base foundry coating, includes component as follows by mass percentage:400~600 mesh Refractory powder 63~67%, sodium bentonite 1.0~1.4%, calcium-base bentonite 1.6~2.3%, thermosetting phenolic resin 1.2~ 1.8%, polyvinyl butyral 0.6~0.9%, ethyl alcohol 28~31%.
The refractory powder includes zirconium English powder, silica flour, mullite powder, schmigel, bauxite powder etc..
The viscosity of the polyvinyl butyral is preferably 8~12 seconds(Apply 4 viscosity meters).
The preparation method of the precoated sand sand mold alcohol-base foundry coating, includes the following steps:
(1)By 400~600 mesh refractory powders, sodium bentonite, calcium-base bentonite, thermosetting phenolic resin, polyvinyl alcohol Butyral mixes in proportion to be added in the kolleroang of with closure, is added in the ethyl alcohol for accounting for ethyl alcohol gross mass 45~55%, is covered lid Son, after abundant mixed grind paste coating, it is spare.
(2)Paste coating taking-up is put into the agitator of with closure, adds in remaining ethyl alcohol, covers lid, stirring is equal It is even to get coating finished product.
Coating of the present invention has following features:First, aggregate is thinner, between 400~600 mesh, is conducive to coating to casting It is permeated in the hole on type surface.Second, therefore, less amount of suspending agent sodium bentonite can be used in high density and high solids, So as to eliminate the contraction distortion of suspending agent, the dimensional accuracy of coating is influenced.Third adds in more calcium-base bentonite, ensures to apply Material has preferable film forming, and compared with sodium bentonite, the expansion rate of calcium-base bentonite is relatively low, and suspension effect is weaker, but Its dried volume contraction deformation is small, is conducive to improve the levelability of coating and reduces the roughness of coating.4th, binding agent Using thermosetting phenolic resin, completion curing when coating is dried, there is no fusings and change when being heated under the effect of subsequent molten steel Shape is advantageous to the finish for obtaining higher.5th, further to improve paint brush sense and finish, added in coating more Polyvinyl butyral.More polyvinyl butyral is allowed to when being acted on by molten steel, and volatilization leaves hole, improves coating Gas permeability, to meet the good venting quality of sand mold, to prevent the contraction distortion of polyvinyl butyral, using the poly- second of low viscosity Enol butyral resin.
Coating of the present invention is stirred evenly, can directly be brushed with hairbrush, easy to operate, paint brush sense and levelability are non- Chang Hao, dope layer do not leave brush mark completely, and drying of lighting a fire after brushing, coating is bright and clean, and the surface quality of continuous castings of cast is good.The present invention Coating is applied in overlay film sand mold, can fill and lead up pit or hole between sand grains completely, due to being brushed with brushing method, is applied All very convenient in any shape sand mold, piling will not occur for corner, also exist without brush mark, after coating, casting mold light Clean, the casting poured into a mould is close to or up to the level of precision-investment casting.Cost advantage the invention enables precoated sand casting is big It is better than precision-investment casting greatly.
With traditional coating manufacturing process ratio, resin and sodium bentonite, calcium-base bentonite etc. used in the present invention are not required to thing It is first pre-processed, kolleroang can be directly added into and carry out mixed grind.Since refractory powder is very thin, surface area is big, to bentonite, resin Deng with extremely strong dispersibility, by abundant mixed grind, all coating additives can be well dissolved in carrier fluid, and auxiliary agent It is uniformly coated on refractory powder particle surface.With traditional coating ratio, viscosity is higher when coating of the present invention uses, and solid content is high, With very strong covering power, it is dry after coating shape it is small, so as to be more advantageous to coating bright and clean seamless, paint brush sense and levelability It is very good.
The beneficial effects of the present invention are:High suspensibility, high solid content, low drying distortions amount, to mould surface Have and fill and lead up bright and clean effect well, coating's permeability is good, and surface finish of casting is high, will not generate gas class defect.
Description of the drawings
Fig. 1 is the cast(ing) surface design sketch that coating cast is prepared using embodiment 1, wherein, coating is not used in A, and B uses real It applies example 1 and prepares coating.
Fig. 2 is the cast(ing) surface design sketch that coating cast is prepared using embodiment 2, wherein, coating is not used in A, and B uses real It applies example 2 and prepares coating.
Fig. 3 is the cast(ing) surface design sketch that coating cast is prepared using embodiment 3, wherein, A uses common coating, and B is used Embodiment 3 prepares coating.
Fig. 4 is the cast(ing) surface design sketch that coating cast is prepared using embodiment 4, wherein, A uses common coating, and B is used Embodiment 4 prepares coating.
Specific embodiment
In order to preferably explain the present invention, below in conjunction with specific embodiment, the present invention is described in further detail, but They do not form the present invention and limit.
Embodiment 1
Prepare coating double centner.
(1)Weigh granularity be 400 mesh 64 kilograms of zirconium English powder, 1.4 kilograms of sodium bentonite, 2.1 kilograms of calcium-base bentonite, 1.6 kilograms of thermosetting phenol-formaldehyde resin powder, polyvinyl butyral(Viscosity is 8 seconds)0.9 kilogram of powder pours into the mixed of with closure In mill;
(2)It weighs 15 kilograms of ethyl alcohol to pour into kolleroang, covers sealing cover, start kolleroang, mixed grind 2 hours obtains paste Object;
(3)Above-mentioned paste is removed and placed in the agitator of with closure, adds in 15 kilograms of ethyl alcohol, agitation and dilution 15 Minute, obtain coating finished product;
(4)Coating finished product is packed into paint can, storage.
It after coating is stirred evenly during use, is coated on precoated sand sand mold with soft wool brush, dry igniting is pourable gold Belong to liquid.Precoated sand sand mold is using the cast(ing) surface effect poured into a mould before and after coating as shown in Figure 1, Figure 1A does not have for precoated sand sand mold The casting poured into a mould using coating has apparent scab;The casting that Figure 1B is poured into a mould by precoated sand sand mold using coating of the present invention, covers The complete coating covering of pit or hole of film sand mould surface, coating surface is bright and clean, no brush mark, good with sand mold wetability, adherency Power is strong, not easily to fall off, therefore the casting poured into a mould does not have scab, and cast(ing) surface is bright and clean.
Embodiment 2
Prepare coating double centner.
(1)Weigh 66 kilograms of the mullite powder that granularity is 600 mesh, 1.4 kilograms of sodium bentonite, calcium-base bentonite 1.8 thousand Gram, 1.2 kilograms of thermosetting phenol-formaldehyde resin powder, polyvinyl butyral(Viscosity is 8 seconds)0.6 kilogram of powder, pours into closure Kolleroang in;
(2)It weighs 14.5 kilograms of ethyl alcohol to pour into kolleroang, covers sealing cover, start kolleroang, mixed grind 2 hours obtains cream Shape object;
(3)Above-mentioned paste is removed and placed in the agitator of with closure, adds in 14.5 kilograms of ethyl alcohol, agitation and dilution 15 minutes, obtain coating finished product;
(4)Coating finished product is packed into paint can, storage.
It after coating is stirred evenly during use, is coated on precoated sand sand mold with soft wool brush, dry igniting is pourable gold Belong to liquid.Precoated sand sand mold is as shown in Figure 2 using the cast(ing) surface effect poured into a mould before and after coating.Fig. 2A does not have for precoated sand sand mold The casting poured into a mould using coating has apparent scab;The casting that Fig. 2 B are poured into a mould by precoated sand sand mold using coating of the present invention, covers The complete coating covering of pit or hole of film sand mould surface, coating surface is bright and clean, no brush mark, good with sand mold wetability, adherency Power is strong, not easily to fall off, therefore the casting poured into a mould does not have scab, and cast(ing) surface is bright and clean.
Embodiment 3
Prepare coating double centner.
(1)Weigh 63 kilograms of the white alundum powder that granularity is 600 mesh, 1.0 kilograms of sodium bentonite, calcium-base bentonite 2.3 thousand Gram, 1.8 kilograms of thermosetting phenol-formaldehyde resin powder, polyvinyl butyral(Viscosity is 12 seconds)0.9 kilogram of powder, pours into closure Kolleroang in;
(2)It weighs 15.5 kilograms of ethyl alcohol to pour into kolleroang, covers sealing cover, start kolleroang, mixed grind 2 hours obtains cream Shape object;
(3)Above-mentioned paste is removed and placed in the agitator of with closure, adds in 15.5 kilograms of ethyl alcohol, agitation and dilution 15 minutes, obtain coating finished product;
(4)Coating finished product is packed into paint can, storage.
It after coating is stirred evenly during use, is coated on precoated sand sand mold with soft wool brush, dry igniting is pourable gold Belong to liquid.Precoated sand sand mold uses common coating(Using 325 mesh refractory powders, lithium bentonite makees suspending agent, while is drawn with water Hair)It is as shown in Figure 3 with the cast(ing) surface effect of coating of the present invention cast.Fig. 3 A are poured into a mould by the common coating of precoated sand sand mold brushing Casting, since common paint brush sense is poor, levelability is bad, causes precoated sand sand mold coating surface not clean, the casting of cast Rough surface;The casting that Fig. 3 B are poured into a mould by overlay film sand mold using coating of the present invention, due to precoated sand mould surface pit or The complete coating covering of hole, coating surface is bright and clean, and no brush mark, good with sand mold wetability, adhesion strength is strong, not easily to fall off, therefore pours The cast(ing) surface of note is brighter and cleaner.
Embodiment 4
Prepare coating double centner.
(1)Weigh granularity be 400 mesh 67 kilograms of silica flour, 1.3 kilograms of sodium bentonite, 1.6 kilograms of calcium-base bentonite, 1.4 kilograms of thermosetting phenol-formaldehyde resin powder, polyvinyl butyral(Viscosity is 8 seconds)0.7 kilogram of powder pours into the mixed of with closure In mill;
(2)It weighs 14 kilograms of ethyl alcohol to pour into kolleroang, covers sealing cover, start kolleroang, mixed grind 2 hours obtains paste Object;
(3)Above-mentioned paste is released and is put into the agitator of with closure, adds in 14 kilograms of ethyl alcohol, agitation and dilution 15 Minute, obtain coating finished product;
(4)Coating finished product is packed into paint can, storage.
It after coating is stirred evenly during use, is coated on precoated sand sand mold with soft wool brush, dry igniting is pourable gold Belong to liquid.Precoated sand sand mold uses common coating(Using 325 mesh refractory powders, organobentonite makees suspending agent, while uses dimethylbenzene Cause)It is as shown in Figure 4 with the cast(ing) surface effect of coating of the present invention cast.Fig. 4 A are poured by the common coating of precoated sand sand mold brushing The casting of note, since paint brush sense is poor, levelability is poor, and precoated sand mould surface coating is not clean, and the casting of cast has scab And cast(ing) surface is coarse, the casting that Fig. 4 B are poured into a mould by precoated sand sand mold using coating of the present invention, due to precoated sand mould surface Pit or the covering of hole complete coating, coating surface is bright and clean, and no brush mark, good with sand mold wetability, adhesion strength is strong, is not easy to take off It falls, without scab, cast(ing) surface is significantly brighter and cleaner.
Above-described embodiment is the preferable embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment Limitation, other any Spirit Essences without departing from the present invention with made under principle change, modification, replacement, combine, simplification, Equivalent substitute mode is should be, is included within protection scope of the present invention.

Claims (3)

1. a kind of precoated sand sand mold alcohol-base foundry coating, it is characterised in that:Include component as follows by mass percentage: 400~600 mesh refractory powders 63~67%, sodium bentonite 1.0~1.4%, calcium-base bentonite 1.6~2.3%, thermosetting property phenol Urea formaldehyde 1.2~1.8%, polyvinyl butyral 0.6~0.9%, ethyl alcohol 28~31%;The polyvinyl butyral Viscosity is 8~12 seconds, applies 4 viscosity meters.
2. precoated sand sand mold alcohol-base foundry coating according to claim 1, it is characterised in that:The refractory powder packet Include zirconium English powder, silica flour, mullite powder, schmigel, bauxite powder.
3. the preparation method of the precoated sand sand mold alcohol-base foundry coating described in claims 1 or 2, it is characterised in that:Including such as Lower step:
(1) by 400~600 mesh refractory powders, sodium bentonite, calcium-base bentonite, thermosetting phenolic resin, polyvinyl alcohol contracting fourth Aldehyde mixes in proportion to be added in the kolleroang of with closure, is added in the ethyl alcohol for accounting for ethyl alcohol gross mass 45~55%, is covered lid, fill Paste coating is obtained after dividing mixed grind;
(2) paste coating taking-up is put into the agitator of with closure, adds in remaining ethyl alcohol, cover lid, stir evenly, i.e., Obtain coating finished product.
CN201610855235.8A 2016-09-27 2016-09-27 A kind of precoated sand sand mold alcohol-base foundry coating and preparation method thereof Active CN106270373B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610855235.8A CN106270373B (en) 2016-09-27 2016-09-27 A kind of precoated sand sand mold alcohol-base foundry coating and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610855235.8A CN106270373B (en) 2016-09-27 2016-09-27 A kind of precoated sand sand mold alcohol-base foundry coating and preparation method thereof

Publications (2)

Publication Number Publication Date
CN106270373A CN106270373A (en) 2017-01-04
CN106270373B true CN106270373B (en) 2018-06-29

Family

ID=57715309

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201610855235.8A Active CN106270373B (en) 2016-09-27 2016-09-27 A kind of precoated sand sand mold alcohol-base foundry coating and preparation method thereof

Country Status (1)

Country Link
CN (1) CN106270373B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109420736B (en) * 2017-08-24 2021-02-12 宁夏共享化工有限公司 Coating composition for casting 3D sand mold printing
CN108176806B (en) * 2017-12-25 2020-04-03 湖北工业大学 Powdery auxiliary agent for alcohol-based casting coating and preparation and use methods thereof
CN108044022A (en) * 2018-01-13 2018-05-18 合肥市瑞宏重型机械有限公司 It is a kind of for alcohol-base paint of sand casting and preparation method thereof
CN109332579B (en) * 2018-11-28 2019-11-12 南京宁阪特殊合金有限公司 It is a kind of to uphang buoyancy coating and preparation method thereof for resin bonded sand mould casting
CN110695309A (en) * 2019-11-28 2020-01-17 桑超 Alcohol-based film-coated sand cavity coating and preparation method thereof
CN111774519A (en) * 2020-07-14 2020-10-16 老河口金琳汽配制造有限公司 Special water-based paint for precoated sand

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2829048A1 (en) * 2001-08-31 2003-03-07 Peugeot Citroen Automobiles Sa Coating compound for the secondary coating of a metal mould, incorporating a foaming agent possibly associated with agents for provoking porosity, homogeneity and adherence in the secondary coating
CN1666828A (en) * 2005-01-18 2005-09-14 湖北工业大学 Anti-seepage burnon casting paint made from alcohol base or aqueous sand powder
CN101259518A (en) * 2008-04-25 2008-09-10 昆明理工大学 Foundry coating prepared from foundry resin sand regeneration power dust and method thereof
CN103394632A (en) * 2013-08-01 2013-11-20 湖北工业大学 Alcohol-based white coating for sand mold cast iron, and preparation method thereof
CN104741513A (en) * 2013-12-25 2015-07-01 青岛玉光精铸厂 Production method for resin sand casting alcohol-based coating
CN104801658A (en) * 2015-04-10 2015-07-29 湖北工业大学 Alcohol-base foundry coating for green sand mold and preparation method of alcohol-base foundry coating
CN105945211A (en) * 2016-05-31 2016-09-21 湖北工业大学 Water-based casting coating for precoated sand casting and preparation method thereof

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105935742B (en) * 2016-05-31 2018-09-14 湖北工业大学 A kind of powdery cast paint and preparation method thereof and application method

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2829048A1 (en) * 2001-08-31 2003-03-07 Peugeot Citroen Automobiles Sa Coating compound for the secondary coating of a metal mould, incorporating a foaming agent possibly associated with agents for provoking porosity, homogeneity and adherence in the secondary coating
CN1666828A (en) * 2005-01-18 2005-09-14 湖北工业大学 Anti-seepage burnon casting paint made from alcohol base or aqueous sand powder
CN101259518A (en) * 2008-04-25 2008-09-10 昆明理工大学 Foundry coating prepared from foundry resin sand regeneration power dust and method thereof
CN103394632A (en) * 2013-08-01 2013-11-20 湖北工业大学 Alcohol-based white coating for sand mold cast iron, and preparation method thereof
CN104741513A (en) * 2013-12-25 2015-07-01 青岛玉光精铸厂 Production method for resin sand casting alcohol-based coating
CN104801658A (en) * 2015-04-10 2015-07-29 湖北工业大学 Alcohol-base foundry coating for green sand mold and preparation method of alcohol-base foundry coating
CN105945211A (en) * 2016-05-31 2016-09-21 湖北工业大学 Water-based casting coating for precoated sand casting and preparation method thereof

Also Published As

Publication number Publication date
CN106270373A (en) 2017-01-04

Similar Documents

Publication Publication Date Title
CN102380576B (en) Mixed casting molding sand and preparation method thereof
KR101515572B1 (en) Manufacturing method of core and casting product using inorganic binder
CN104736270B (en) Mold materials mixture based on inorganic binder and the method for manufacturing the mold and core that are used for metal casting
CN105880464B (en) A kind of graphite mold casting method of large-scale thin-wall titanium alloy casting
CN105307796B (en) For manufacturing the mould of metal casting and the molding material blends containing lithium based on inorganic bond of core
CN102380575B (en) Resin casting molding sand and preparation method thereof
US2441695A (en) Casting mold
RU2176575C2 (en) Method and composition for making sleeves and other members of pouring gates and feeders for casting molds
CN105499497B (en) A kind of V methods casting technique
CN105436411B (en) A kind of high ventilative lost-foam casting method
CN105057601B (en) A kind of method of three-dimensional spray printing shape casting core
US8211226B2 (en) Cement-based materials system for producing ferrous castings using a three-dimensional printer
US6972302B2 (en) Casting sand cores and expansion control methods therefor
CN105834360B (en) The casting method of shell mould is made using 3D printing
CN102825215B (en) Lost foam casting method for heavy casting
CN203737936U (en) Fiber-reinforced investment casting composite shell
US8627877B2 (en) Core or foundry sand coated and/or mixed with water glass with a water content in the range of ≧ approximately 0.25% by weight to approximately 0.9% by weight
CN102481622B (en) Release agent for producing mould coatings
CN102933332B (en) Structure for casting production
CA2539122C (en) Molding composition and method of use
JP6141539B2 (en) Method for producing a lost core or molded product for the production of a casting
CN102366812B (en) A kind of preparation method of sodium silicate sand used for casting
CN102069148B (en) Method for casting brake disc for high-speed locomotive
CN100515600C (en) Hot precoated sand stack casting process
CN102407275B (en) Expendable pattern casting (EPC) molding shell paint for casting steel and preparation method thereof

Legal Events

Date Code Title Description
PB01 Publication
C06 Publication
SE01 Entry into force of request for substantive examination
C10 Entry into substantive examination
GR01 Patent grant
GR01 Patent grant