CN102873266B - Alcohol-group dry powder sand mould foundry coating - Google Patents

Alcohol-group dry powder sand mould foundry coating Download PDF

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Publication number
CN102873266B
CN102873266B CN201210399323.3A CN201210399323A CN102873266B CN 102873266 B CN102873266 B CN 102873266B CN 201210399323 A CN201210399323 A CN 201210399323A CN 102873266 B CN102873266 B CN 102873266B
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China
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coating
kilograms
dry powder
alcohol
iron oxide
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Expired - Fee Related
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CN201210399323.3A
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CN102873266A (en
Inventor
刘斌
姚义俊
沈国柱
苏义
盛群
楼之栋
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Nanjing University of Information Science and Technology
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Nanjing University of Information Science and Technology
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Abstract

The invention discloses alcohol-group dry powder sand mould foundry coating, which comprises the following components in percentage by weight: 60-75% of bauxite, 2-10% of amorphous graphite, 3-15% of lamellar graphite, 2-10% of iron oxide red, 1-5% of attapulgite, 0.5-1.5% of sodium bentonite, 1-5% of polyvinyl butyral, 0.1-0.5% of surfactant and 0.1-0.5% of dispersing agent. The dry powder coating has the advantages of simple preparation technology, convenience in use and good high-temperature sand adhesiveness resistance.

Description

A kind of alcohol radical dry powder sand casting coating
Technical field
A kind of casting and molding auxiliary material of the present invention, are specifically related to a kind of alcohol radical dry powder mold paint for sand casting.
Background technology
On casting sand type (core) working surface, apply one deck cast paint, can effectively prevent and reduce surperficial scab gradually, the defects such as burning into sand, sand holes, reduce surface roughness.The quality of cast paint is the direct factor that affects whether scab of foundry goods, burning into sand and surface finish of casting, casting dimension accuracy.Cast paint is of a great variety, substantially can be divided into two classes: water based paint and alcohol-base paint.Wherein alcohol-base paint is both curable through lighting after coating, be used in conjunction with various self-hardening sand technique, can not need to dry, can shorten the production cycle, simplify technique, save the energy, reduce drying plant investment, be to be cast a kind of quick drying paint that boundary is widely used, be widely used in the production of steel, iron, coloured foundry goods.But the carrier of alcohol-base paint is mainly the compositions such as methyl alcohol, ethanol or isopropyl alcohol, belongs to inflammable dangerous material, be subject to all multiple constraints at aspects such as packaging, transport, storages; In addition because the suspension stability of alcohol-base paint is poor, coating easy layering in long-distance transport with in depositing process, makes its hydraulic performance decline, and serious also may make coating occur hardening and scrap.And employing alcohol based dry powder paint, owing to not containing flammable solvent, only need to add alcohols solvent to stir when use in dry powder after; Conveniently, the haul-cycle time is short for dry powder paint packaging, storage, and expense is low.
Chinese patent (application number: 86105456) disclose a kind of mould coating made of lithium bentonite and zirconite powder, the raw materials such as lithium bentonite, ZrO2 powder, resin and titanium dioxide are milled by mixing and made powder-type coating, when use, directly add ethanol to be diluted to slurry coating material, but because lithium bentonite is swelling without causing, the suspension of coating is poor.Chinese patent (application number: 200910189788.4) disclose the preparation method of the compound and surface modified dry powder mold paint of a kind of alcohol group nano, by adopting nano lamellar clay and nanometer SiO 2composition composite suspension agent, then become alcohol based dry powder paint with refractory powder, binding agent and other auxiliary agent mixed grinds, its preparation technology requires very high, controls the performance that slightly can not affect at once coating.Chinese patent (publication number: CN100377811C) discloses a kind of production method of Alcohoh base casting coating material powder for concave convex rod, using the Concave-convex clay rod of sodium modification as suspending agent, made coating material powder can reach higher suspensibility in ethanol, but in this coating material powder, modified attapulgite clay percentage is 55 ~ 85%, refractory powder is only 10 ~ 45%, the consumption of suspending agent is much higher than refractory powder, although the coating obtaining has good suspension stability, using the refractoriness that reduces coating as cost.Therefore limit the scope of application of coating, can not be used for the production of steel-casting and large-sized iron casting.
Summary of the invention
The object of the invention is the defect existing in prior art in order to solve, a kind of alcohol radical dry powder mold paint that can be used for cast steel, cast iron and nonferrous alloy sand casting is provided, this coating composition is even, there is the anti-stick grittiness of good high temperature, and this coating adds the slurry coating material obtaining after alcohol and has good suspension stability.
In order to achieve the above object, the invention provides a kind of alcohol radical dry powder sand casting coating, this coating comprises the component of following weight percentage: bauxite 60-75%, amorphous graphite 2-10%, flake graphite 3-15%, iron oxide red 2-10%, attapulgite 1-5%, sodium bentonite 0.5-1.5%, polyvinyl butyral resin 1-5%, surfactant 0.1-0.5%, dispersant 0.1-0.5%.
As preferably, the proportioning of above-mentioned dry powder paint is: bauxite 65-75%, amorphous graphite 3-8%, flake graphite 6-12%, iron oxide red 3-8%, attapulgite 2-5%, sodium bentonite 0.8-1.2%, polyvinyl butyral resin 2-3%, surfactant 0.2-0.4%, dispersant 0.2-0.4%.
Wherein, the granularity of bauxite, attapulgite, sodium bentonite, setting graphite flake graphite and iron oxide red is 200 ~ 300 orders.
Surfactant is selected Determination of Polyoxyethylene Non-ionic Surfactants, preferred alkyl phenol polyethenoxy ether.
Dispersant is selected polycarboxylate salt dispersant, preferred aliphat dicarboxylic acids.
The preparation technology of alcohol radical dry powder sand casting coating of the present invention is: take respectively various raw materials by said components, put into grinding mill and mix the 60-120 minute that mills.
When concrete use, according to different manner of application such as brushing, dip-coating, flow coat or sprayings, use ethanol, methyl alcohol or isopropyl alcohol to mix with powder, agitation and dilution pulp coating, its Baume degrees is 45-65.Coating suspension 2h >=98% obtaining, 8h >=93%, 24h >=87%.After coating applies, light immediately dryly, the dry powder mold paint making is applicable to the sand casting process of cast steel, cast iron or nonferrous alloy.
The present invention has the following advantages compared to existing technology:
1, dry powder paint employing of the present invention 200 ~ 300 object bauxites, amorphous graphite, flake graphite and iron oxide red are fire-resistant base material, and composite this coating that makes of these components has good elevated temperature strength and stability, and gas forming amount is little.The simultaneously use of matching surface activating agent, has increased substantially the penetrating power of coating, impels coating can infilter sand mold, fills up the gap between sand grains, effectively prevents penetration.
2, attapulgite has the layer chain structure of specialty fibers shape crystal habit, has good liberation characteristic; Sodium bentonite forms space network structure in solution, makes fire resisting material particle be difficult for sinking; Utilize attapulgite, sodium bentonite and dispersant composite as suspending agent, make the slurry coating material of preparation there is good suspension, in use procedure, do not precipitate, improved stability and the brushability of coating.
3, utilize polyvinyl butyral resin, ensured that the slurry coating material of preparing while use has being well coated with property at normal temperatures; Also can make the base-material in coating combine closely at long period high temperature, ensure the strength of coating of coating on sand mold surface, effectively prevent that molten steel from directly contacting and causing scab with sand mold, thereby ensure the surface quality of foundry goods.
4, the preparation technology of dry powder paint of the present invention is simple, easy to use, has the anti-stick grittiness of good high temperature.
Detailed description of the invention
Below in conjunction with specific embodiment, alcohol radical dry powder sand casting coating of the present invention is elaborated.
Embodiment 1
Take 75 kilograms of bauxites, 5 kilograms of amorphous graphites, 8 kilograms of flake graphites, 3 kilograms of iron oxide reds, 5 kilograms of attapulgites, 0.9 kilogram of sodium bentonite, 2.5 kilograms of polyvinyl butyral resins, 0.3 kilogram of APES, 0.3 kilogram of aliphatic dicarboxylic acid.Wherein the granularity of bauxite, attapulgite, sodium bentonite, amorphous graphite, flake graphite and iron oxide red is 200 ~ 300 orders.Above-mentioned each component is put into grinding mill mixing and mill 120 minutes, obtain product.
Embodiment 2
Take 65 kilograms of bauxites, 8 kilograms of amorphous graphites, 12 kilograms of flake graphites, 8 kilograms of iron oxide reds, 3.6 kilograms of attapulgites, 1.0 kilograms of sodium bentonites, 2 kilograms of polyvinyl butyral resins, 0.2 kilogram of APES, 0.2 kilogram of aliphatic dicarboxylic acid, wherein the granularity of bauxite, attapulgite, sodium bentonite, amorphous graphite, flake graphite and iron oxide red is 200 ~ 300 orders.Above-mentioned each component is put into grinding mill mixing and mill 60 minutes, obtain product.
Embodiment 3
Take 70 kilograms of bauxites, 8 kilograms of amorphous graphites, 10 kilograms of flake graphites, 3 kilograms of iron oxide reds, 4 kilograms of attapulgites, 1.2 kilograms of sodium bentonites, 3 kilograms of polyvinyl butyral resins, 0.4 kilogram of APES, 0.4 kilogram of polyacrylic acid.Wherein the granularity of bauxite, attapulgite, sodium bentonite, amorphous graphite, flake graphite and iron oxide red is 200 ~ 300 orders.Above-mentioned each component is put into grinding mill mixing and mill 90 minutes, obtain product.
Embodiment 4
Take 75 kilograms of bauxites, 2 kilograms of amorphous graphites, 6 kilograms of flake graphites, 9 kilograms of iron oxide reds, 3 kilograms of attapulgites, 1.2 kilograms of sodium bentonites, 3 kilograms of polyvinyl butyral resins, 0.4 kilogram of aliphatic amine polyoxyethylene ether, 0.4 kilogram of aliphatic dicarboxylic acid.Wherein the granularity of bauxite, attapulgite, sodium bentonite, amorphous graphite, flake graphite and iron oxide red is 200 ~ 300 orders.Above-mentioned each component is put into grinding mill mixing and mill 75 minutes, obtain product.
Embodiment 5
Take 70 kilograms of bauxites, 8 kilograms of amorphous graphites, 12 kilograms of flake graphites, 4.6 kilograms of iron oxide reds, 2 kilograms of attapulgites, 0.8 kilogram of sodium bentonite, 2 kilograms of polyvinyl butyral resins, 0.3 kilogram of APES, 0.3 kilogram of aliphatic dicarboxylic acid.Wherein the granularity of bauxite, attapulgite, sodium bentonite, amorphous graphite, flake graphite and iron oxide red is 200 ~ 300 orders.Above-mentioned each component is put into grinding mill mixing and mill 105 minutes, obtain product.
Embodiment 6
Take 60 kilograms of bauxites, 10 kilograms of amorphous graphites, 15 kilograms of flake graphites, 2.5 kilograms of iron oxide reds, 5 kilograms of attapulgites, 1.5 kilograms of sodium bentonites, 5 kilograms of polyvinyl butyral resins, 0.5 kilogram of APES, 0.5 kilogram of aliphatic dicarboxylic acid.Wherein the granularity of bauxite, attapulgite, sodium bentonite, amorphous graphite, flake graphite and iron oxide red is 200 ~ 300 orders.Above-mentioned each component is put into grinding mill mixing and mill 60 minutes, obtain product.
Embodiment 7
Take 75 kilograms of bauxites, 9.3 kilograms of amorphous graphites, 3 kilograms of flake graphites, 10 kilograms of iron oxide reds, 1 kilogram of attapulgite, 0.5 kilogram of sodium bentonite, 1 kilogram of polyvinyl butyral resin, 0.1 kilogram of aliphatic amine polyoxyethylene ether, 0.1 kilogram of polyacrylic acid.Wherein the granularity of bauxite, attapulgite, sodium bentonite, amorphous graphite, flake graphite and iron oxide red is 200 ~ 300 orders.Above-mentioned each component is put into grinding mill mixing and mill 120 minutes, obtain product.
Effect embodiment
Dry powder paint prepared by above-described embodiment, adds ethanol, agitation and dilution pulp coating, and its Baume degrees is 45.Coating suspension 2h >=98% obtaining, 8h >=93%, 24h >=87%.The slurry coating material of making is lighted immediately dry after applying.The dry powder mold paint making is applicable to the sand casting process of cast steel, cast iron or nonferrous alloy.

Claims (1)

1. an alcohol radical dry powder sand casting coating, it is characterized in that, comprise the component of following weight percentage: bauxite 65-75%, amorphous graphite 3-8%, flake graphite 6-12%, iron oxide red 3-8%, attapulgite 2-5%, sodium bentonite 0.8-1.2%, polyvinyl butyral resin 2-3%, surfactant 0.2-0.4%, dispersant 0.2-0.4%; The granularity of described bauxite, amorphous graphite, flake graphite, iron oxide red, attapulgite and sodium bentonite is 200 ~ 300 orders; Described surfactant is Determination of Polyoxyethylene Non-ionic Surfactants; Described dispersant is polycarboxylate salt dispersant.
CN201210399323.3A 2012-10-19 2012-10-19 Alcohol-group dry powder sand mould foundry coating Expired - Fee Related CN102873266B (en)

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CN103586405B (en) * 2013-10-30 2016-04-27 吴江市液铸液压件铸造有限公司 A kind of cast iron alcohol radical powder-type coating
CN104014723A (en) * 2014-05-09 2014-09-03 方学军 Expansible graphite alcohol-group casting coating and preparation method thereof
CN104014722A (en) * 2014-05-09 2014-09-03 方学军 Active carbon/kaolin composite alcohol-group casting coating and preparation method thereof
CN104249130B (en) * 2014-09-24 2016-01-27 西峡县西泵特种铸造有限公司 A kind of coating and preparation technology thereof improving precision casting inner surface graphite linings thickness
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
CN106077499B (en) * 2016-08-15 2018-11-20 合肥江淮铸造有限责任公司 A kind of bell housing sand core dipping process
CN107537970B (en) * 2016-09-28 2018-11-13 湖北工业大学 A kind of powdery cast paint and its preparation and application method
CN108145070B (en) * 2017-12-26 2019-11-08 湖北工业大学 A kind of low-cost environmental-protecting alcohol radical iron casting coating and preparation method thereof
CN108480549A (en) * 2018-05-18 2018-09-04 宜兴市东山新型材料有限公司 A kind of casting alcohol based dry powder paint and preparation method thereof

Citations (6)

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Publication number Priority date Publication date Assignee Title
GB1356264A (en) * 1971-02-02 1974-06-12 Foseco Int Coatings for foundry sand moulds
CN101288898A (en) * 2008-04-29 2008-10-22 即墨市海隆机械有限公司 Production method of casting alcohol based paints using resin bonded sand
CN101569918A (en) * 2009-06-10 2009-11-04 刘则斌 Coating for lost foam cast iron
CN101607298A (en) * 2009-07-02 2009-12-23 沈阳铸造研究所 A kind of attapulgite suspending agent for casting alcohol-based coating and preparation method
CN101642796A (en) * 2009-08-28 2010-02-10 深圳市景鼎现代科技有限公司 Formula and preparation process of alcohol group nanometer composite and surface modified dry powder mold paint
CN102179473A (en) * 2011-05-11 2011-09-14 李华山 Lost foam casting composite coating

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1356264A (en) * 1971-02-02 1974-06-12 Foseco Int Coatings for foundry sand moulds
CN101288898A (en) * 2008-04-29 2008-10-22 即墨市海隆机械有限公司 Production method of casting alcohol based paints using resin bonded sand
CN101569918A (en) * 2009-06-10 2009-11-04 刘则斌 Coating for lost foam cast iron
CN101607298A (en) * 2009-07-02 2009-12-23 沈阳铸造研究所 A kind of attapulgite suspending agent for casting alcohol-based coating and preparation method
CN101642796A (en) * 2009-08-28 2010-02-10 深圳市景鼎现代科技有限公司 Formula and preparation process of alcohol group nanometer composite and surface modified dry powder mold paint
CN102179473A (en) * 2011-05-11 2011-09-14 李华山 Lost foam casting composite coating

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