CN102248120B - Low thermoconductive paint for casting lost foam of thin wall cast - Google Patents

Low thermoconductive paint for casting lost foam of thin wall cast Download PDF

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Publication number
CN102248120B
CN102248120B CN 201110088867 CN201110088867A CN102248120B CN 102248120 B CN102248120 B CN 102248120B CN 201110088867 CN201110088867 CN 201110088867 CN 201110088867 A CN201110088867 A CN 201110088867A CN 102248120 B CN102248120 B CN 102248120B
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China
Prior art keywords
paint
casting
lost foam
thin
cast
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Expired - Fee Related
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CN 201110088867
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CN102248120A (en
Inventor
付宏阁
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ZHONGFANG VALVES XICHUAN MANUFACTURING CO LTD
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ZHONGFANG VALVES XICHUAN MANUFACTURING CO LTD
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Priority to CN 201110088867 priority Critical patent/CN102248120B/en
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Expired - Fee Related legal-status Critical Current
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Abstract

The invention discloses a low thermoconductive paint for casting a lost foam of a thin wall cast. The paint is prepared from the following raw materials, by mass, 50-70% of quartz powder, 3-15% of mica powder, 10-40% of high purity aluminum powder, 0.3-1% of sodium based bentonite, and 7-11% of a composite binder. Compared with paints prepared through the prior art, the paint which has the advantages of low thermal conductivity coefficient, large specific heat capacity, good permeability and the like allows casting defects of hot tearing, cold shut, insufficient mold filling, pores and the like appearing in casting the thin wall cast with the lost foam to be effectively solved, and simultaneously the paint which has the advantages of good soakage property, good rigidness, low hygroscopicity, good shelling property and the like allows casts with smooth surfaces and high surface quality to be obtained, and is suitable to be used in casting the lost foam of the thin wall cast.

Description

A kind of low thermoconductive paint for casting lost foam of thin wall cast
Technical field
The invention belongs to casting technology field, be specifically related to a kind of coating for the preparation of high-strength and high ductility nodular cast iron flywheel casing evaporative pattern.
Background technology
The quality of foundry goods depends primarily on lost foam paint, and the proportioning of lost foam paint is vital operation, so coating technology is one of key technology of lost foam casting process successful Application.Lost foam casting coating should have following major function: 1. increase the rigidity of polystyrene (EPS) apperance, apperance distortion when preventing carrying, moulding; Washing away of high-temperature liquid metal resisted in the impact of molding sand, friction when 2. resisting moulding, and the good separation layer as between molten metal and back-up sand prevents the generation of scab defective; 3. during liquid metal filling, the gas that the foaming mould pyrolysis is produced is controllably discharged, and the liquid heat hydrolysis products that produces when absorbing the foaming mould pyrolysis avoids pore, elephant skin defective to produce.Therefore, intensity and hot permeability are the very important processing performances of lost foam casting coating.
In lost foam paint, refractory aggregate is the main body of coating, and its mass fraction is generally greater than 50%.Mainly contain zirconium English powder, bauxite, brown alundum powder, silica flour, talcum powder, mullite powder, mica powder etc.Its size grading should take into account and prevent scab and hot permeability, and particle shape will be conducive to improve gas permeability, usually selects the spherical particle of some, is conducive to the eliminating of the liquefaction products of the effusion of gas after model gasification or model incomplete decomposing.
The carrier of lost foam paint can adopt water or ethanol, considers the many employings of lost foam casting water base.Bonding agent mainly comprises clay, waterglass, syrup, spent pulping liquor, white glue with vinyl, Ludox etc.Mainly consider in recent years the factor of the following aspects when selecting binding agent: (1) reduces the high temperature gas-forming property; (2) improve being coated with property; (3) improve strength of coating and rigidity; (4) not etch model etc.Suspending agent can prevent that coating from depositing, layering, lump, make coating to have certain thixotropy, adopts bentonite, Concave-convex clay rod, organic high molecular compound and complex thereof etc. more.Also add in addition surfactant in lost foam paint, purpose is the being coated with property that increases coating, improves affinity and the bond strength of coating and model surface, usually adds in addition other additives, as defoamer, water reducer, anticorrisive agent, pigment etc.
Summary of the invention
The technical problem that exists for solving prior art, the object of the present invention is to provide a kind ofly have that soakage is good, good rigidly, hygroscopicity is low, shelling property is good low thermoconductive paint for casting lost foam of thin wall cast, hot tearing, the cold shut that has occurred when effectively having solved the lost foam casting thin-section casting, the casting flaw of filling type deficiency, pore can obtain the foundry goods that any surface finish is smooth, surface quality is high.
For achieving the above object, the technical solution used in the present invention: this low thermoconductive paint for casting lost foam of thin wall cast is characterized in that being prepared from by the raw material of following mass percent: silica flour 50~70%, mica powder 3~15%, high-alumina fly 10~40%, sodium bentonite 0.3~1%, compound binding agent 7~11%.
Also include surfactant 0.1~0.3%, liquid detergent 0.005~0.03% in preferred above-mentioned formula.
Preferred this low thermoconductive paint for casting lost foam of thin wall cast is characterized in that being prepared from by the raw material of following mass percent: silica flour 67%, mica powder 11%, high-alumina fly 11%, sodium bentonite 0.8%, compound binding agent 9.5%.
Preferred this low thermoconductive paint for casting lost foam of thin wall cast is characterized in that being prepared from by the raw material of following mass percent: silica flour 60%, mica powder 5%, high-alumina fly 35%, sodium bentonite 0.5%, compound binding agent 10.5%, surfactant 0.1%, liquid detergent 0.01%.
Described compound binding agent is prepared from by the raw material of following mass percent: PVA35-38%, Ludox 18-19%, CMC18-20%, sodium bentonite 18-19%, pulp powder 4-11%.
Use the low heat-conductive coating of the present invention to adopting twice dipping process in the bell housing lost foam casting, coating after dry 4 hours after dip-coating for the first time, guarantee apperance not crackle, do not show money or valuables one carries unintentionally.Guarantee after dip-coating that for the second time the apperance coating layer thickness is at 0.8~1.0mm; To near ingate, bury type bottom delthyrium, semicircle orifice, zanjon position, circular hole position and also will hang for the third time and be coated with, the dip-coating process must be noted the orientation of dip-coating, firmly appropriateness, prevent the apperance distortion.Be placed on after extension is coated with and prevent distortion on specific support, be placed on shelf again after the model drying and dry.
Adopt the beneficial effect of such scheme: added insulation material and exothermic material in this coating, make the advantages such as it has that thermal conductivity factor is low, specific heat capacity is large, good permeability, hot tearing, the cold shut that has occurred when effectively having solved the lost foam casting thin-section casting, fill the casting flaws such as type deficiency, pore.This coating has the advantages such as soakage is good, good rigidly, hygroscopicity is low, shelling property is good simultaneously, can obtain the foundry goods that any surface finish is smooth, surface quality is high; Its extension is coated with the Rigidity and strength that can effectively improve Foam Pattern with stoving process, prevents from that apperance is coated with in process at extension to be out of shape, and has also prevented apperance fracture in burying the case process.Be fit to be applied to the thin-section casting lost foam casting.
The specific embodiment
Embodiment 1:
This low thermoconductive paint for casting lost foam of thin wall cast, raw material by following mass percent is prepared from: 200 order silica flours 70%, mica powder 5%, high-alumina fly 25%, sodium bentonite 1%, compound binding agent 11%, wherein said compound binding agent is prepared from by the raw material of following mass percent: PVA35%, Ludox 18%, CMC20%, sodium bentonite 18%, pulp powder 9%.Add for the first time water and grind in right amount, add for the second time suitable quantity of water to adjust stirring and make this low heat-conductive coating.Coating suspension: 90-96%, gas permeability: 0.9-1.1, intensity: 620-690, viscosity: 22-26.
Embodiment 2:
This low thermoconductive paint for casting lost foam of thin wall cast is prepared from by the raw material of following mass percent: 200 order silica flours 50%, mica powder 15%, high-alumina fly 35%, sodium bentonite 0.3%, compound binding agent 7%.Wherein said compound binding agent is prepared from by the raw material of following mass percent: PVA38%, Ludox 19%, CMC18%, sodium bentonite 19%, pulp powder 6%.Add for the first time water and grind in right amount, add for the second time suitable quantity of water to adjust stirring and make this low heat-conductive coating.
Embodiment 3:
Preferred this low thermoconductive paint for casting lost foam of thin wall cast is prepared from by the raw material of following mass percent: 200 order silica flours 67%, mica powder 11%, high-alumina fly 11%, sodium bentonite 0.8%, compound binding agent 9.5%.Add for the first time water and grind in right amount, add for the second time suitable quantity of water to adjust stirring and make this low heat-conductive coating.
Embodiment 4:
This low thermoconductive paint for casting lost foam of thin wall cast is prepared from by the raw material of following mass percent: 200 order silica flours 60%, mica powder 3%, high-alumina fly 37%, sodium bentonite 0.3%, compound binding agent 7%, surfactant 0.3%, liquid detergent 0.005%.Add for the first time water and grind in right amount, add for the second time suitable quantity of water to adjust stirring and make this low heat-conductive coating.
Embodiment 5:
Preferred this low thermoconductive paint for casting lost foam of thin wall cast is prepared from by the raw material of following mass percent: 200 order silica flours 60%, mica powder 5%, high-alumina fly 35%, sodium bentonite 0.5%, compound binding agent 10.5%, surfactant 0.1%, liquid detergent 0.01%.Add for the first time water and grind in right amount, add for the second time suitable quantity of water to adjust stirring and make this low heat-conductive coating.
Use the low heat-conductive coating of the present invention to adopting twice dipping process in the bell housing lost foam casting, coating after dry 4 hours after dip-coating for the first time, guarantee apperance not crackle, do not show money or valuables one carries unintentionally.Guarantee after dip-coating that for the second time the apperance coating layer thickness is at 0.8~1.0mm; To near ingate, bury type bottom delthyrium, semicircle orifice, zanjon position, circular hole position and also will hang for the third time and be coated with, the dip-coating process must be noted the orientation of dip-coating, firmly appropriateness, prevent the apperance distortion.Be placed on after extension is coated with and prevent distortion on specific support, be placed on shelf again after the model drying and dry.

Claims (2)

1. a low thermoconductive paint for casting lost foam of thin wall cast, is characterized in that being prepared from by the raw material of following mass percent: silica flour 50~70%, mica powder 3~15%, high-alumina fly 10~40%, sodium bentonite 0.3~1%, compound binding agent 7~11%, surfactant 0.1~0.3%, liquid detergent 0.005~0.03%.
2. low thermoconductive paint for casting lost foam of thin wall cast according to claim 1, it is characterized in that: described compound binding agent is prepared from by the raw material of following mass percent: PVA35-38%, Ludox 18-19%, CMC18-20%, sodium bentonite 18-19%, pulp powder 4-11%.
CN 201110088867 2011-04-11 2011-04-11 Low thermoconductive paint for casting lost foam of thin wall cast Expired - Fee Related CN102248120B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 201110088867 CN102248120B (en) 2011-04-11 2011-04-11 Low thermoconductive paint for casting lost foam of thin wall cast

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Application Number Priority Date Filing Date Title
CN 201110088867 CN102248120B (en) 2011-04-11 2011-04-11 Low thermoconductive paint for casting lost foam of thin wall cast

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CN102248120A CN102248120A (en) 2011-11-23
CN102248120B true CN102248120B (en) 2013-05-15

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Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102836957A (en) * 2012-08-31 2012-12-26 太仓科博尔精密铸业有限公司 Lost foam coating and preparation method thereof
CN102962396B (en) * 2012-11-23 2016-05-25 湖北福策来科技有限公司 The water base lost foam paint of high-strength environment-friendly type for casting
CN103042168B (en) * 2012-12-30 2015-06-03 安岳县金龙机械制造有限公司 Lost foam casting coating and preparation method thereof
CN103418746A (en) * 2013-08-25 2013-12-04 阳城县华王通用离心铸管厂 Technique for casting gray cast iron thin-wall pipe fitting evanescent die
CN104226893B (en) * 2014-08-29 2016-03-23 吴江市液铸液压件铸造有限公司 A kind of lost foam casting coating and preparation method thereof
CN104624922A (en) * 2015-01-29 2015-05-20 石家庄满鼎福铸造有限公司 Lost foam casting coating for gray cast iron and preparation method of lost foam casting coating
CN105215262A (en) * 2015-10-08 2016-01-06 蚌埠冠宜型材科技有限公司 A kind of environment-friendly type sandbinder
CN106270372B (en) * 2016-09-20 2018-09-28 桃江新兴管件有限责任公司 A kind of cast iron lost foam paint and preparation method thereof

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5950702A (en) * 1997-04-11 1999-09-14 Ashland Inc. Consumable pattern coating for lost foam castings
CN1663707A (en) * 2005-01-28 2005-09-07 曹博海 Improved water based coating for lost foam
WO2006125612A1 (en) * 2005-05-25 2006-11-30 Ashland-Südchemie-Kernfest GmbH Method for drying water-based coatings
CN101428328A (en) * 2008-12-06 2009-05-13 华中科技大学 Powdery paint for lost foam casting of cast iron
CN101497105A (en) * 2009-03-12 2009-08-05 深圳市景鼎现代科技有限公司 Cast form water borne coating and technique for preparing the same
JP2010131665A (en) * 2008-12-08 2010-06-17 Okazaki Kosanbutsu Kk Facing material for casting

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5950702A (en) * 1997-04-11 1999-09-14 Ashland Inc. Consumable pattern coating for lost foam castings
CN1663707A (en) * 2005-01-28 2005-09-07 曹博海 Improved water based coating for lost foam
WO2006125612A1 (en) * 2005-05-25 2006-11-30 Ashland-Südchemie-Kernfest GmbH Method for drying water-based coatings
CN101428328A (en) * 2008-12-06 2009-05-13 华中科技大学 Powdery paint for lost foam casting of cast iron
JP2010131665A (en) * 2008-12-08 2010-06-17 Okazaki Kosanbutsu Kk Facing material for casting
CN101497105A (en) * 2009-03-12 2009-08-05 深圳市景鼎现代科技有限公司 Cast form water borne coating and technique for preparing the same

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Application publication date: 20111123

Assignee: XIDAO PHOTOELECTRIC INSTRUMENT TECHNOLOGY CO., LTD.

Assignor: Zhongfang Valves Xichuan Manufacturing Co.,Ltd.

Contract record no.: 2014410000043

Denomination of invention: Low thermoconductive paint for casting lost foam of thin wall cast

Granted publication date: 20130515

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Record date: 20140512

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