CN102366814B - A kind of preparation method of coating for metal mold used in aluminum alloy low pressure casting - Google Patents
A kind of preparation method of coating for metal mold used in aluminum alloy low pressure casting Download PDFInfo
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- CN102366814B CN102366814B CN201110307627.8A CN201110307627A CN102366814B CN 102366814 B CN102366814 B CN 102366814B CN 201110307627 A CN201110307627 A CN 201110307627A CN 102366814 B CN102366814 B CN 102366814B
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Abstract
The invention discloses a kind of preparation method of coating for metal mold used in aluminum alloy low pressure casting, coating prepared by the inventive method consist of 35-45% mullite powder, 5-10% alumina powder, 5.5-6.5% sodium bentonite, 2.0-2.5% polyvinyl alcohol, 0.8-1.0% sodium alginate, 3.5-4.0% Ludox, 0.8-1.0% neopelex, surplus are water, preparation method's raw material sources of the present invention are extensive, cost is low, and preparation coating operations is simple.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.
Description
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 the preparation method providing 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 preparation method for coating for metal mold used in aluminum alloy low pressure casting, comprises the steps:
1) composition of coating is, in mass fraction: 35-45% mullite powder, 5-10% alumina powder, 5.5-6.5% sodium bentonite, 2.0-2.5% polyvinyl alcohol, 0.8-1.0% sodium alginate, 3.5-4.0% Ludox, 0.8-1.0% neopelex, surplus are water, by above-mentioned component weigh batching;
2) first 200-280 order sodium bentonite, 200-280 order mullite powder, 200-280 order alumina powder are added in edge runner by said ratio, be dry mixed 15-25min;
3) then sodium alginate, neopelex, polyethylene alcohol and water is added successively by said ratio, mixed grind 180-240min;
4) then Ludox mixed grind 30-40min is added by said ratio;
5) finally the coating after mixed grind is sieved through 80-100 mesh sieve, removing impurity.
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.
The beneficial effect that the present invention prepares the method for coating is:
1. the inventive method raw material sources are extensive, and cost is low, and preparation coating operations is simple.
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 preparation method for coating for metal mold used in aluminum alloy low pressure casting, comprises the steps:
1) composition of coating is, in mass fraction: 35% mullite powder, 10% alumina powder, 5.5% sodium bentonite, 2.5% polyvinyl alcohol, 0.8% sodium alginate, 4.0% Ludox, 0.8% neopelex, surplus are water, by above-mentioned component weigh batching;
2) first 200-280 order sodium bentonite, 200-280 order mullite powder, 200-280 order alumina powder are added in edge runner by said ratio, be dry mixed 15min;
3) then sodium alginate, neopelex, polyethylene alcohol and water is added successively by said ratio, mixed grind 240min;
4) then Ludox mixed grind 30min is added by said ratio;
5) finally the coating after mixed grind is sieved through 100 mesh sieve, removing impurity.
Embodiment two
A preparation method for coating for metal mold used in aluminum alloy low pressure casting, comprises the steps:
1) composition of coating is, in mass fraction: 45% mullite powder, 5% alumina powder, 6.5% sodium bentonite, 2.0% polyvinyl alcohol, 1.0% sodium alginate, 3.5% Ludox, 1.0% neopelex, surplus are water, by above-mentioned component weigh batching;
2) first 200-280 order sodium bentonite, 200-280 order mullite powder, 200-280 order alumina powder are added in edge runner by said ratio, be dry mixed 25min;
3) then sodium alginate, neopelex, polyethylene alcohol and water is added successively by said ratio, mixed grind 180min;
4) then Ludox mixed grind 40min is added by said ratio;
5) finally the coating after mixed grind is sieved through 80 mesh sieve, removing impurity.
Embodiment three
A preparation method for coating for metal mold used in aluminum alloy low pressure casting, comprises the steps:
1) composition of coating is, in mass fraction: 40% mullite powder, 8% alumina powder, 6% sodium bentonite, 2.3% polyvinyl alcohol, 0.9% sodium alginate, 3.8% Ludox, 0.9% neopelex, surplus are water, by above-mentioned component weigh batching;
2) first 200-280 order sodium bentonite, 200-280 order mullite powder, 200-280 order alumina powder are added in edge runner by said ratio, be dry mixed 20min;
3) then sodium alginate, neopelex, polyethylene alcohol and water is added successively by said ratio, mixed grind 210min;
4) then Ludox mixed grind 35min is added by said ratio;
5) finally the coating after mixed grind is sieved through 90 mesh sieve, removing impurity.
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 (1)
1. a preparation method for coating for metal mold used in aluminum alloy low pressure casting, is characterized in that, comprises the steps:
1) composition of coating is, in mass fraction: 40-45% mullite powder, 8-10% alumina powder, 5.5-6.5% sodium bentonite, 2.0-2.5% polyvinyl alcohol, 0.8-1.0% sodium alginate, 3.5-4.0% Ludox, 0.8-1.0% neopelex, surplus are water, by above-mentioned component weigh batching;
2) first 200-280 order sodium bentonite, 200-280 order mullite powder, 200-280 order alumina powder are added in edge runner by said ratio, be dry mixed 15-25min;
3) then sodium alginate, neopelex, polyethylene alcohol and water is added successively by said ratio, mixed grind 180-240min;
4) then Ludox mixed grind 30-40min is added by said ratio;
5) finally the coating after mixed grind is sieved through 80-100 mesh sieve, removing impurity.
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| CN201110307627.8A CN102366814B (en) | 2011-10-11 | 2011-10-11 | A kind of preparation method of coating for metal mold used in aluminum alloy low pressure casting |
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| CN201110307627.8A CN102366814B (en) | 2011-10-11 | 2011-10-11 | A kind of preparation method of coating for metal mold used in aluminum alloy low pressure casting |
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| CN102366814B true CN102366814B (en) | 2016-01-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR102492076B1 (en) * | 2019-09-20 | 2023-01-27 | 콘풍 매테리얼스 인터네셔널 컴퍼니 리미티드 | Coating material for high-purity aluminum smelting casting and its manufacturing method and use |
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| CN102617159B (en) * | 2012-03-15 | 2014-04-16 | 苏州伊索来特耐火纤维有限公司 | High-wind speed resistance capacity wear-resistant fiber surface coating |
| CN102989998B (en) * | 2012-12-25 | 2014-10-29 | 常州大学 | Chilling alcoholic-group coating absorbing heat by using melting, sublimation and vaporization of substances |
| 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 |
| CN107243594A (en) * | 2017-06-14 | 2017-10-13 | 合肥市旺友门窗有限公司 | A kind of used in aluminium alloy casting insulating refractory coating and preparation method thereof |
| 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 |
| CN109290514B (en) * | 2018-11-23 | 2020-06-23 | 贵州安吉航空精密铸造有限责任公司 | Low-pressure sand core coating and preparation method thereof |
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| CN1116141A (en) * | 1995-04-29 | 1996-02-07 | 华南理工大学 | Paint for spun cast pipe |
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| KR102492076B1 (en) * | 2019-09-20 | 2023-01-27 | 콘풍 매테리얼스 인터네셔널 컴퍼니 리미티드 | Coating material for high-purity aluminum smelting casting and its manufacturing method and use |
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Effective date of registration: 20151215 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 |
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Effective date of registration: 20160527 Address after: 225508 Jiangsu Province, Taizhou city Jiangyan District Qintong Town Industrial Zone Patentee after: Jiang Suhai reaches ship valve industry 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 |