CN102366815B - A kind of coating for metal mold used in aluminum alloy low pressure casting - Google Patents

A kind of coating for metal mold used in aluminum alloy low pressure casting Download PDF

Info

Publication number
CN102366815B
CN102366815B CN201110307629.7A CN201110307629A CN102366815B CN 102366815 B CN102366815 B CN 102366815B CN 201110307629 A CN201110307629 A CN 201110307629A CN 102366815 B CN102366815 B CN 102366815B
Authority
CN
China
Prior art keywords
coating
order
metal mold
aluminum alloy
low pressure
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
CN201110307629.7A
Other languages
Chinese (zh)
Other versions
CN102366815A (en
Inventor
许立新
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.)
Jiangsu Huajiang Technology Co., Ltd.
Original Assignee
华文蔚
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 华文蔚 filed Critical 华文蔚
Priority to CN201110307629.7A priority Critical patent/CN102366815B/en
Publication of CN102366815A publication Critical patent/CN102366815A/en
Application granted granted Critical
Publication of CN102366815B publication Critical patent/CN102366815B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

The invention discloses a kind of coating for metal mold used in aluminum alloy low pressure casting, the composition of this coating is, in mass fraction: 200-280 order mullite powder 35-45%, 200-280 order alumina powder 5-10%, 200-280 order sodium bentonite 5.5-6.5%, polyvinyl alcohol 2.0-2.5%, sodium alginate 0.8-1.0%, Ludox 3.5-4.0%, neopelex 0.8-1.0%, surplus are water.

Description

A kind of coating for metal mold used in aluminum alloy low pressure casting
Technical field
The present invention relates to casting field, particularly low pressure casting aluminum alloy technical field.
Background technology
The kind of metal mold coating is a lot, mainly distinguishes according to paint adhesion agent and resistant to elevated temperatures inserts.Conventional binding agent has syrup, waterglass, also the high polymer binder such as useful resin, polyvinyl alcohol.Resistant to elevated temperatures inserts is black lead powder, spraying carbon black, coke powder, high-alumina fly etc.Conventional syrup coating composition is: black lead powder > 30%, spraying carbon black > 45%, syrup > 15%.After these materials are mixed, be placed in gyratory shaker, add suitable quantity of water, fully stir 1.5-2 hour.Coating density requires at 1.2-1.3g/cm 3between.Conventional sodium silicate binder paint ingredient is: carbon black 80%, waterglass 20% and appropriate moisture, density 1.1-1.2g/cm 3.Conventional polyvinyl alcohol adhesive paint ingredient is: high-alumina flies more than 200 orders and 300-400g polyvinyl alcohol and the appropriate moisture system of mixing form.The advantage using syrup to make binding agent is that metal mold is easily cleared up when reusing.Shortcoming is syrup is make with grain, and there are certain requirements the temperature of metal mold when using, and mold temperature too prepared paint is not coated with, and the moisture in coating is not volatile, easily causes gas hole defect; Mold temperature is too high; syrup is easily burnt; coating is made to lose adhesive property; during cast, molten metal easily washes out dope layer; protective effect is lost to metal mold; make cast(ing) surface easily occur many tiny pin holes, sometimes also can produce the phenomenon that metal mold and foundry goods molten metal adhere to each other, time serious, cause scrapping of foundry goods and casting mold.The advantage of waterglass coating is that dry strength is large, undergoes no deterioration and burn during metal mold temperature height.Shortcoming clears up difficulty after using.Paint thickness can not be coated with thick, only can reach 0.3-0.5mm, otherwise easy to crackly peels off, and therefore casting mold is shorter for service life.Polyvinyl alcohol coating advantage is that dry strength is large, can with multiple high temperature resistant filler mixed preparing, paint thickness can thicken to 2-5mm, can produce carbonization bright film under molten metal high temperature action, makes cast(ing) surface bright and clean.Shortcoming is that the mixed time processed is long, will ceaselessly stir during spraying, and to prevent coating layering and precipitating, the more difficult control of coating layer thickness is even.
In prior art, in the low-pressure casting of aluminium alloy, for metal mold cavity and the coating pouring into a mould instrument surface spraying, domestic traditional product mainly adopts the pulvis such as zinc oxide, whiting, graphite powder to be raw material, add waterglass and water by different proportion and carry out scene modulation, after stirring, spraying uses.Facts have proved, the open defect of this technology has: the preparation coating operations that is 1. in harmonious proportion bothers, and expend time in, 2. raw material cost is high, affects product benefit; 3. due to traditional raw material poor thermal insulation property, therefore during use, need frequent heating die cavity and spraying, and easily cause the sticky burning of die cavity; 4. the surface quality of continuous castings produced is not good enough.
Summary of the invention
For the deficiencies in the prior art, an object of the present invention is to provide a kind of coating for metal mold used in aluminum alloy low pressure casting.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of coating for metal mold used in aluminum alloy low pressure casting, the composition of this coating is, in mass fraction: 200-280 order mullite powder 35-45%, 200-280 order alumina powder 5-10%, 200-280 order sodium bentonite 5.5-6.5%, polyvinyl alcohol 2.0-2.5%, sodium alginate 0.8-1.0%, Ludox 3.5-4.0%, neopelex 0.8-1.0%, surplus are water.
Preferably, it consists of, in mass fraction: 200-280 order mullite powder 40%, 200-280 order alumina powder 8%, 200-280 order sodium bentonite 6%, polyvinyl alcohol 2.3%, sodium alginate 0.9%, Ludox 3.8%, neopelex 0.9%, surplus are water.
The main refractory aggregate of coating of the present invention selects 200-280 mullite powder and 200-280 order alumina powder, and is main refractory aggregate with mullite powder, makes low-voltage cast aluminum part any surface finish, without scabbing, without defects such as adhesions.The refractory aggregate of coating of the present invention, except mullite, in order to improve the resistance to elevated temperatures of coating, also adds 5-10% alumina powder, can guarantee that coating has good elevated temperature strength and good flow coat performance.
Coating of the present invention makees suspending agent with sodium bentonite, polyvinyl alcohol and sodium alginate, and suspending agent is used for preventing the precipitation of refractory aggregate.Sodium alginate adds in coating, can significantly improve coating suspension.And the making raw material of polyvinyl alcohol is oil and natural gas, its wide material sources, and nontoxic, tasteless, add in coating and can improve coating suspension performance, share with sodium bentonite and sodium alginate, higher sedimentation stability, quick-drying and good brushability can be obtained.
The viscosity of Ludox is less, and the powder liquor ratio of coating can improve greatly, thus coating surface intensity is improved, and hardness improves, to obtain the bright and clean cast(ing) surface of high-quality.In addition, using silica-sol wash good stability, and the mode of natural drying can be adopted to obtain intensity.Ludox or nontoxic corrosion-free non-flammable explosive material, with the coating environmentally safe of its preparation, to personal safety.Add 3.5-4.0% Ludox in coating of the present invention and make binding agent, coating can be made to have good high temperature bond intensity.
Can hang well for making coating and be attached to metal mold surface, require there is certain wettability to metal mold surface, add proper amount of surfactant, to reduce the surface tension of coating or the interfacial tension between coating and metal mold material, 0.8-1.0% neopelex is added in coating of the present invention, namely the sodium particle of electronegative benzene sulfonamide acid group and positively charged is ionized into after it is water-soluble, one end and the metal mold of positively charged attract to align mutually, reduce the interfacial tension between metal mold and coating, improve coating and casting mold in conjunction with effect.
Coating beneficial effect of the present invention is:
1. this coating raw material wide material sources, cost is low.
2. coating of the present invention only need be brushed in the metal mold that temperature is 300-330 DEG C, after drying, does not need frequently to heat die cavity and spraying during use, easy to use.
3. coating of the present invention is used for aluminum alloy low-pressure casting metal mold, the easy demoulding of foundry goods, and cast(ing) surface is bright and clean, the defects such as nothing scabs, adhesion.
Detailed description of the invention
Embodiment one
A kind of coating for metal mold used in aluminum alloy low pressure casting, the composition of this coating is, in mass fraction: 200-280 order mullite powder 35%, 200-280 order alumina powder 10%, 200-280 order sodium bentonite 5.5%, polyvinyl alcohol 2.5%, sodium alginate 0.8%, Ludox 4.0%, neopelex 0.8%, surplus are water.
Embodiment two
A kind of coating for metal mold used in aluminum alloy low pressure casting, the composition of this coating is, in mass fraction: 200-280 order mullite powder 45%, 200-280 order alumina powder 5%, 200-280 order sodium bentonite 6.5%, polyvinyl alcohol 2.0%, sodium alginate 1.0%, Ludox 3.5%, neopelex 1.0%, surplus are water.
Embodiment three
A kind of coating for metal mold used in aluminum alloy low pressure casting, the composition of this coating is, in mass fraction: 200-280 order mullite powder 40%, 200-280 order alumina powder 8%, 200-280 order sodium bentonite 6%, polyvinyl alcohol 2.3%, sodium alginate 0.9%, Ludox 3.8%, neopelex 0.9%, surplus are water.
Applicant states, the present invention illustrates detailed process equipment and process flow process of the present invention by above-described embodiment, but the present invention is not limited to above-mentioned detailed process equipment and process flow process, namely do not mean that the present invention must rely on above-mentioned detailed process equipment and process flow process and could implement.Person of ordinary skill in the field should understand, any improvement in the present invention, to equivalence replacement and the interpolation of auxiliary element, the concrete way choice etc. of each raw material of product of the present invention, all drops within protection scope of the present invention and open scope.

Claims (4)

1. a coating for metal mold used in aluminum alloy low pressure casting, it is characterized in that, the composition of this coating is, in mass fraction: 200-280 order mullite powder 35%, 200-280 order alumina powder 10%, 200-280 order sodium bentonite 5.5%, polyvinyl alcohol 2.5%, sodium alginate 0.8%, Ludox 4.0%, neopelex 0.8%, surplus are water.
2. a coating for metal mold used in aluminum alloy low pressure casting, it is characterized in that, the composition of this coating is, in mass fraction: 200-280 order mullite powder 45%, 200-280 order alumina powder 5%, 200-280 order sodium bentonite 6.5%, polyvinyl alcohol 2.0%, sodium alginate 1.0%, Ludox 3.5%, neopelex 1.0%, surplus are water.
3. a coating for metal mold used in aluminum alloy low pressure casting, it is characterized in that, the composition of this coating is, in mass fraction: 200-280 order mullite powder 40%, 200-280 order alumina powder 8%, 200-280 order sodium bentonite 6%, polyvinyl alcohol 2.3%, sodium alginate 0.9%, Ludox 3.8%, neopelex 0.9%, surplus are water.
4. the brushing method of the coating according to any one of claim 1-3, is characterized in that, is in the metal mold of 300-330 DEG C, after drying by the coating application prepared in temperature.
CN201110307629.7A 2011-10-11 2011-10-11 A kind of coating for metal mold used in aluminum alloy low pressure casting Active CN102366815B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201110307629.7A CN102366815B (en) 2011-10-11 2011-10-11 A kind of coating for metal mold used in aluminum alloy low pressure casting

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201110307629.7A CN102366815B (en) 2011-10-11 2011-10-11 A kind of coating for metal mold used in aluminum alloy low pressure casting

Publications (2)

Publication Number Publication Date
CN102366815A CN102366815A (en) 2012-03-07
CN102366815B true CN102366815B (en) 2016-02-03

Family

ID=45759427

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201110307629.7A Active CN102366815B (en) 2011-10-11 2011-10-11 A kind of coating for metal mold used in aluminum alloy low pressure casting

Country Status (1)

Country Link
CN (1) CN102366815B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103468087B (en) * 2013-08-22 2016-01-06 青岛元鼎高合金管业有限公司 High alloy steel pipe rotary casting high-temperature coatings and manufacture method thereof
CN106077445B (en) * 2016-07-28 2018-05-04 华中科技大学 A kind of aluminum alloy low-pressure casting chill coating and preparation method thereof
CN108129920A (en) * 2017-12-06 2018-06-08 安徽金达节能材料发展有限公司 One kind is used for aluminium alloy casting metal coating
CN108555228A (en) * 2017-12-06 2018-09-21 安徽金达节能材料发展有限公司 One kind being used for aluminium alloy coating
CN109261891B (en) * 2018-09-04 2020-07-31 安徽惠明机械制造有限公司 Coating for die-casting mold and preparation method thereof

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1116141A (en) * 1995-04-29 1996-02-07 华南理工大学 Paint for spun cast pipe
CN101041175A (en) * 2006-03-21 2007-09-26 联合工艺公司 Methods and materials for attaching casting cores
CN101384384A (en) * 2006-01-17 2009-03-11 阿什兰德-南方化学-中坚有限公司 Water-based liquid size containing a seeding agent
CN101391281A (en) * 2008-11-13 2009-03-25 上海交通大学 Magnesium alloy metal-mold low-pressure casting coatings and preparation method thereof
CN101502868A (en) * 2009-03-06 2009-08-12 靖江市黎明铸造材料厂 Centrifugal casting radiant tube paint and preparation method thereof
CN101658899A (en) * 2009-09-17 2010-03-03 上海交通大学 Magnesium-alloy metal-type casting coating and preparation method thereof

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7575039B2 (en) * 2003-10-15 2009-08-18 United Technologies Corporation Refractory metal core coatings

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1116141A (en) * 1995-04-29 1996-02-07 华南理工大学 Paint for spun cast pipe
CN101384384A (en) * 2006-01-17 2009-03-11 阿什兰德-南方化学-中坚有限公司 Water-based liquid size containing a seeding agent
CN101041175A (en) * 2006-03-21 2007-09-26 联合工艺公司 Methods and materials for attaching casting cores
CN101391281A (en) * 2008-11-13 2009-03-25 上海交通大学 Magnesium alloy metal-mold low-pressure casting coatings and preparation method thereof
CN101502868A (en) * 2009-03-06 2009-08-12 靖江市黎明铸造材料厂 Centrifugal casting radiant tube paint and preparation method thereof
CN101658899A (en) * 2009-09-17 2010-03-03 上海交通大学 Magnesium-alloy metal-type casting coating and preparation method thereof

Also Published As

Publication number Publication date
CN102366815A (en) 2012-03-07

Similar Documents

Publication Publication Date Title
CN102366814B (en) A kind of preparation method of coating for metal mold used in aluminum alloy low pressure casting
CN102366815B (en) A kind of coating for metal mold used in aluminum alloy low pressure casting
CN102407277B (en) Method for preparing coating for metal molds for centrifugal pipe casting
CN101491823B (en) Centrifugal casting roller coatings and preparation method thereof
CN102430702B (en) Centrifugal cast pipe metal type paint
CN104311045A (en) Resin-combined tundish light coating and preparation method thereof
CN103537613B (en) A kind of have resistance to 1450 DEG C of high temperature, heat insulation, the release formula complexing agent of demoulding effect
CN102407279B (en) Method for preparing water-based coating for sand mold casting
CN101767184A (en) Lost foam casting cast iron coating for preventing carbon defects and preparation method thereof
CN103302236A (en) Alcohol-based non-zirconium composite refractory aggregate spray paint for wet cast steel and preparation method thereof
CN102284678A (en) Method for preparing formwork of precisely-cast titanium alloy
CN104084530A (en) Production method of water-based flow-coating painting for iron casting
CN102397982B (en) Sand casting water-based coating
CN102873266A (en) Alcohol-group dry powder sand mould foundry coating
CN107243594A (en) A kind of used in aluminium alloy casting insulating refractory coating and preparation method thereof
CN102284676A (en) Coating for metal mold casting
CN104475669A (en) Anti-burn on casting coating and manufacturing method thereof
CN104829241A (en) Continuous casting tundish working lining slag line coating material
MXPA02005009A (en) Insulating refractory material.
CN108788001A (en) A kind of large size alloy cast steel part evaporative pattern water based paint
CN103880388B (en) A kind of its manufacture method of fire resistant wear prevention paint
CN104475664A (en) Building gypsum/attapulgite composite casting coating and manufacturing method thereof
CN104325066A (en) Modified fly ash alcohol base casting coating material and production method thereof
CN109175225B (en) Composite environment-friendly coating suitable for high-chromium white cast iron and preparation method thereof
CN104874723A (en) Preparation method of high temperature resistant casting coating

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C41 Transfer of patent application or patent right or utility model
TA01 Transfer of patent application right

Effective date of registration: 20160104

Address after: Lake Town, Xishan District People's road 214000 Jiangsu city of Wuxi province and red Ju Wei Village No. 100

Applicant after: Hua Wenwei

Address before: 214000 Jiangsu Province, Wuxi city Xishan District Beizhen tin Bei Guang Ming Cun Shi Qiao Bang No. 3 (Xu Lixin)

Applicant before: Xu Lixin

C14 Grant of patent or utility model
GR01 Patent grant
TR01 Transfer of patent right
TR01 Transfer of patent right

Effective date of registration: 20170810

Address after: At the junction of 225200 Jiangsu city in Yangzhou Province Economic Development Zone Jiangdu District Zhang and Zhang Gang supporting way and road at le

Patentee after: Jiangsu Huajiang Technology Co., Ltd.

Address before: Lake Town, Xishan District People's road 214000 Jiangsu city of Wuxi province and red Ju Wei Village No. 100

Patentee before: Hua Wenwei