CN101176909B - Dip coating for accurate core - Google Patents
Dip coating for accurate core Download PDFInfo
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- CN101176909B CN101176909B CN2007101644947A CN200710164494A CN101176909B CN 101176909 B CN101176909 B CN 101176909B CN 2007101644947 A CN2007101644947 A CN 2007101644947A CN 200710164494 A CN200710164494 A CN 200710164494A CN 101176909 B CN101176909 B CN 101176909B
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Abstract
The invention discloses a high permeation and thin coating layer dipping coating for precision sand core, which is measured by weight ratio; the main raw material is as follow: silicon powder is 35% to 45%; calcined talc is 5% to 10%; aphanitic graphite is 3% to 5%; suspension concentrate is 1% to 2%; compound adhesive is 1.5% to 4%, and deionized water is 46% to 52%. The dipping coating of the invention is applied for resin sand for mass production of casting, more particularly for the precision phenolic resin sand core of film laminating sand; the coating layer strength of the san core after painted coating is high; the ability of withstanding molten iron and mechanical thermal impact is strong; the coating layer is thin; the contour of the pouring casting pieces is clear; the size precision is high, which can meet the producing requirement of all complex precision casting pieces of automobile, diesel engine, hydraulic pressure and other industries.
Description
Technical field
The present invention relates to a kind of foundry facing, particularly a kind of accurate core dip-coating paint, it is applicable to produces applying of accurate shell cores such as line precoated sand in enormous quantities.
Background technology
At present, in moulding, core preparation technology, because the precoated sand good moldability, sand core strength height, clear-cut, the dimensional accuracy height can be made the most complicated shell core, abroad, has obtained fast development.Now, precoated sand has been widely used in industries such as automobile, diesel engine, hydraulic part, can satisfy the production requirement of various complicated precision castings.
The precoated sand shell core with the characteristics of coating is: 1. thin because of the shell core grit size: general 70/140, surface hydrophobic is strong, thereby coating should have very strong permeability, the while shell core is complex-shaped and core thin, is often surrounded by molten metal, and coating should have remarkable anti-sand washing and antiseized grittiness for this reason; 2. all require very highly as the dimensional accuracy of shell core foundry goods and surface roughness, its coating anti-drips dropping down property and anti-accumulation property wants high; Form the thin level and smooth and uniform coating of one deck on the shell core surface, covering power is strong, dispersed and tack is good.
At number of patent application is in " a kind of free of contamination water-based dip applicating paint " of 200610046059.X, discloses a kind of water-based dip applicating paint:
" be by zirconium English powder 17-30%, brown corundum 20-35%, mullite 5-15%, graphite 5-15%, forsterite 5-15%, polyvinyl alcohol 1-4%, suspending agent 1.5-3.5% and water 30-45% form.Wherein polyvinyl alcohol is a binding agent, and suspending agent is made by 1: 0.5: 0.5 by illite, sepiolite and bentonite." but the weak point of above-mentioned patent content be:
1, used and be up to 30% zirconium English powder, China's zirconium English powder scarcity of resources, most of dependence on import costs an arm and a leg, and causes the coating raw material source limited, and cost increases.
2, the refractory aggregate component is many, has fluctuation will influence the performance of whole coating system as a certain component raw material quality, and the sintering character of wayward coating and other performance.
3, use the polyvinyl alcohol organic binder bond, the elevated temperature strength of coating is low, the ability of anti-stick sand of coating and sand washing.
Summary of the invention
Technical problem to be solved by this invention is the present situation at prior art, and a kind of cheap, stable performance and elevated temperature strength height are provided, the height infiltration that the ability of anti-stick sand of coating and sand washing is strong, the accurate core dip-coating paint of shallow layer.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: a kind of accurate core dip-coating paint, it is characterized in that by weight percentage, and mainly form by following raw material preparation:
Silicon powder 35% to 37%, calcination of talc 6% to 7%, cryptocrystalline graphite 4% to 5%, suspending agent 1.5% to 2%, compound binding agent 2% to 2.5%, deionized water 48% to 50%.Wherein,
Described silicon powder granularity to 45 μ m can obtain effect preferably.
Better, described suspending agent is a SN type commodity inorganic clay powder.
Better, described compound binding agent is prepared by 2: 3 weight ratio by polyvinyl acetate emulsion, Ludox.
One of preferred version is: by weight percentage, dip-coating paint is made up of following raw material:
Silicon powder 35%, calcination of talc 7%, cryptocrystalline graphite 4%, suspending agent 2%, compound binding agent 2%, deionized water 50%.
Two of preferred version is: by weight percentage, dip-coating paint is made up of following raw material:
Silicon powder 41%, calcination of talc 5%, cryptocrystalline graphite 3%, suspending agent 1%, compound binding agent 2%, deionized water 48%.
Three of preferred version is: by weight percentage, dip-coating paint is made up of following raw material:
Silicon powder 37%, calcination of talc 6%, cryptocrystalline graphite 5%, suspending agent 1.5%, compound binding agent 2.5%, deionized water 48%.
Described a kind of accurate core dip-coating paint can be used for 70/140 accurate resinoid bond core.
Described a kind of accurate core with dip-coating paint in 70/140 accurate resinoid bond core top layer length of penetration more than or equal to 1.5 millimeters, its coating layer thickness is less than or equal to 0.20 millimeter.
The principle of each raw material of the present invention is: (1) silicon powder is as refractory aggregate, and is very abundant and cheap in china natural resources, and the while silicon powder also has makes coating sintering tendency preferably, and the present invention is controlled at its percetage by weight in 40% to 50%.(2) calcination of talc is as sintering agent, its price is also very cheap, help the coating densified sintering product simultaneously, talcum powder can improve the flowability that molten metal is full of sand mold, the talcum powder that contains dolomite can reduce the danger that foundry goods produces pin hole, talcous heat-insulating property can be used for controlling the setting rate of foundry goods, prevents that ironcasting from producing spoken parts in traditional operas etc.But talcous addition also should be controlled, and adds the effects such as helping burning that do not have less, and adding increases gas forming amount simultaneously with reducing the refractoriness of coating, and it is 5% to 10% that the present invention controls its percetage by weight.(3) cryptocrystalline graphite can improve the covering performance and the anti-stick grittiness energy of coating.Graphite is divided into kish and cryptocrystalline graphite, and the former though can improve the spreadability of coating, easily makes coating pile up on the top layer in the form of sheets, be difficult for forming shallow layer, and cryptocrystalline graphite can overcome its shortcoming.But cryptocrystalline graphite can not be added, otherwise can make the painting color blackening, and operating environment of pollution be the more important thing is the sintering character that can reduce coating, and to control its percetage by weight be 3% to 5% in the present invention for this reason.(4) suspending agent used in the present invention is the independently developed SN type of an inventor inorganic clay powder, prove a kind of efficient suspending agent through domestic how tame user, be characterized in that addition is few, make coating rheological property good, in formulation for coating material, its percetage by weight is 1% to 2%.(5) at only adding the deficiency that organic binder bond reduces the coating elevated temperature strength, the present invention adds a kind of organic and inorganic compound binding agent in formulation for coating material, because of making coating respectively, polyvinyl acetate emulsion, silica sol have low temperature and elevated temperature strength, thereby compound binding agent is prepared by 2: 3 weight ratio by polyvinyl acetate emulsion, Ludox, its addition makes coating have optimum properties in percetage by weight is 1.5% to 4% scope.(6) the present invention is to select the silicon powder granularity less than 45 μ m in the measure aspect the control coating penetration degree of depth; Amount of water in the control prescription, when amount of water during less than 46% percetage by weight, the coating length of penetration is shallow, when amount of water during greater than 52% percetage by weight, the coating length of penetration is dark excessively, and the coating spreadability is poor, the piebald defective occurs on the core surface, and amount of water optimum weight percent scope of the present invention is between 46% to 52%.
Compared with prior art, the present invention learns with Surface Physical Chemistry, colloid chemistry, material flowing deformation and Engineering Materials are made theoretical direction, base oneself upon domestic raw materials, by to the flow performance of kind, granularity and the distribution thereof of refractory powder, aqueous dispersion, and the scientific allocations such as combination of binding agent, make the present invention obtain cheap, stable performance and elevated temperature strength height, and coating penetration is good, combine firmly with core, spreadability is good, and coating is thin, the core clear-cut, the turning does not have advantages such as accumulation.
The specific embodiment
Below in conjunction with embodiment the present invention is described in further detail:
Embodiment 1
Select for use raw material weight percentage to be: silicon powder 41%, calcination of talc 5%, cryptocrystalline graphite 3%, suspending agent 1%, compound binding agent 2%, deionized water 47%, wherein, described silicon powder granularity is less than 45 μ m, and described suspending agent is SN
Type commodity inorganic clay powder, described compound binding agent is prepared by 2: 3 weight ratio by polyvinyl acetate emulsion, Ludox, above-mentioned raw materials is mixed again, and qualifiedly after testing can only make this product.Can be used for 70/140 accurate resinoid bond core according to the made coating of present embodiment, through detecting, its main performance and effect are as follows: suspension was in 24 hours: more than or equal to 98%, length of penetration is: 1.5 millimeters, coating layer thickness is: 0.18 millimeter, the high temperature crack resistance is: flawless, surface roughness: Ra 6.3 μ m to 12.5 μ m.
Embodiment 2
Select for use raw material weight percentage to be: silicon powder 35%, calcination of talc 7%, cryptocrystalline graphite 4%, suspending agent 2%, compound binding agent 2%, deionized water 50%, wherein, described silicon powder granularity is less than 45 μ m, described suspending agent is a SN type commodity inorganic clay powder, described compound binding agent is prepared by 2: 3 weight ratio by polyvinyl acetate emulsion, Ludox, above-mentioned raw materials is mixed again, and qualifiedly after testing can make this product.Can be used for 70/140 accurate resinoid bond core according to the made coating of present embodiment, through detecting, its main performance and effect are as follows: suspension was in 24 hours: more than or equal to 98%, length of penetration is: 1.8 millimeters, coating layer thickness is: 0.14 millimeter, the high temperature crack resistance is: flawless, surface roughness: Ra 6.3 μ m to 12.5 μ m.
Embodiment 3
Select for use raw material weight percentage to be: silicon powder 37%, calcination of talc 6%, cryptocrystalline graphite 5%, suspending agent 1.5%, compound binding agent 2.5%, deionized water 48%, wherein, described silicon powder granularity＜45 μ m, described suspending agent is a SN type commodity inorganic clay powder, described compound binding agent is prepared by 2: 3 weight ratio by polyvinyl acetate emulsion, Ludox, above-mentioned raw materials is mixed again, and qualifiedly after testing can make this product.Can be used for 70/140 accurate resinoid bond core according to the made coating of present embodiment, through detecting, its main performance and effect are as follows: suspension was in 24 hours: more than or equal to 98%, length of penetration is: 1.6 millimeters, coating layer thickness is: 0.15 millimeter, the high temperature crack resistance is: flawless, surface roughness are: Ra 6.3 μ m to 12.5 μ m.
Though the present invention is described by the reference preferred embodiment,, those skilled in the art should understand, and in the scope of claims, can do the various variation on form and the details.
Claims (9)
1. accurate core dip-coating paint is characterized in that: by weight percentage, mainly be made up of following raw material preparation:
Silicon powder 35% to 37%, calcination of talc 6% to 7%, cryptocrystalline graphite 4% to 5%, suspending agent 1.5% to 2%, compound binding agent 2% to 2.5%, deionized water 48% to 50%.
2. a kind of accurate core dip-coating paint according to claim 1 is characterized in that: described silicon powder granularity is less than 45 μ m.
3. a kind of accurate core dip-coating paint according to claim 2 is characterized in that: described suspending agent is a SN type commodity inorganic clay powder.
4. a kind of accurate core dip-coating paint according to claim 3 is characterized in that: described compound binding agent is prepared by 2: 3 weight ratio by polyvinyl acetate emulsion, Ludox.
5. a kind of accurate core dip-coating paint according to claim 4 is characterized in that: by weight percentage, the content of described each raw material is:
Silicon powder 35%, calcination of talc 7%, cryptocrystalline graphite 4%, suspending agent 2%, compound binding agent 2%, deionized water 50%.
6. a kind of accurate core dip-coating paint according to claim 4 is characterized in that: by weight percentage, the content of described each raw material is:
Silicon powder 37%, calcination of talc 6%, cryptocrystalline graphite 5%, suspending agent 1.5%, compound binding agent 2.5%, deionized water 48%.
7. according to the described a kind of accurate core dip-coating paint of the arbitrary claim of claim 1 to 6, it is characterized in that: described dip-coating paint is used for 70/140 accurate resinoid bond core.
8. a kind of accurate core dip-coating paint according to claim 7 is characterized in that: described dip-coating paint in the length of penetration on described accurate resinoid bond core top layer is: more than or equal to 1.5 millimeters.
9. a kind of accurate core dip-coating paint according to claim 7 is characterized in that: the coating layer thickness of described dip-coating paint on described accurate resinoid bond core is: be less than or equal to 0.2 millimeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101644947A CN101176909B (en) | 2007-12-05 | 2007-12-05 | Dip coating for accurate core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101644947A CN101176909B (en) | 2007-12-05 | 2007-12-05 | Dip coating for accurate core |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101176909A CN101176909A (en) | 2008-05-14 |
| CN101176909B true CN101176909B (en) | 2010-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2007101644947A Active CN101176909B (en) | 2007-12-05 | 2007-12-05 | Dip coating for accurate core |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102773403B (en) * | 2012-07-07 | 2014-02-12 | 山西宇清环保有限公司 | Method for producing overturning plate valve cover by resin sand |
| CN103611877A (en) * | 2013-11-20 | 2014-03-05 | 江苏江旭铸造集团有限公司 | Coating for casting sand mold |
| CN105499481A (en) * | 2014-10-14 | 2016-04-20 | 河南金耐源新材料科技有限公司 | Novel ceramic paint for casting process |
| US10335851B2 (en) * | 2017-04-24 | 2019-07-02 | GM Global Technology Operations LLC | Sand core to eliminate degenerated skin |
| CN109746385A (en) * | 2019-02-28 | 2019-05-14 | 合肥江淮铸造有限责任公司 | A kind of preparation method of sand core dip-coating paint and the coating of preparation |
| CN110918869B (en) * | 2019-11-14 | 2020-11-20 | 上海金范机械铸造有限公司 | High-temperature-resistant coating for resin sand casting and preparation method thereof |
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