CN101817058A - Shield type coating composition and preparation process of coating thereof - Google Patents
Shield type coating composition and preparation process of coating thereof Download PDFInfo
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- CN101817058A CN101817058A CN 201010139412 CN201010139412A CN101817058A CN 101817058 A CN101817058 A CN 101817058A CN 201010139412 CN201010139412 CN 201010139412 CN 201010139412 A CN201010139412 A CN 201010139412A CN 101817058 A CN101817058 A CN 101817058A
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Abstract
The invention discloses a shield type coating composition, comprising a fire-proof powder mixture, a suspending agent, a binder and a carrier fluid, wherein the fire-proof powder composition consists of high temperature resistant components and functional components, and has a particle size of 200-325 meshes. The invention selects a reasonable fire-proof powder composition to prepare the shield type sand coating, thus achieving good sand burning resistance, and preventing the defects of recarburization on extra-low-carbon stainless steel piece surface and desulphurization on nodular cast iron piece surface, thereby realizing the aim of ensuring casting quality.
Description
Technical field:
The present invention relates to a kind of casting and molding auxiliary material, especially a kind of preparation technology who is used for the shield type coating composition and the coating thereof of sand casting.
Background technology:
Mo(u)ld blacking is the skim refractory coating that is coated on sand mold (core) surface, is made of components such as refractory powder, carrier, suspending agent, binding agents usually.Wherein refractory powder is the basis of coating, and at the coating inner suspension, coating is coated on the working surface of sand mold (core) equably by means of suspending agent for it, and after the carrier fluid volatilization, binding agent makes the dry and hard one-tenth dense coating of refractory powder.Use mo(u)ld blacking can change and control contact condition between molten metal and sand mold (core) interface and the reaction under the high temperature, prevent the generation of number of drawbacks, thereby improve the cast(ing) surface quality significantly.
Adopt organic binder bond sand to produce super-low carbon stainless steel spare, maximum problem is cast(ing) surface carburetting, and it will cause the anticorrosive and anti-fatigue ability of foundry goods to descend, and makes the welding performance variation.For solving the problem of super-low carbon stainless steel spare case-carbonizing, at present by adopting sodium silicate molding, and at the common commercially available Zircon powder alcohol group dope of type (core) surface-coated, apply common commercially available zirconium English powder water based paint and oven dry again after lighting drying, but still be difficult to aborning accurately control coating quality, thereby do not reach the purpose of anti-carburizing.
When adopting furane resins-toluenesulfonic acid sand mold to produce nodular iron casting, toluenesulfonic acid decomposes in foundry goods-sand mold interface resin sand, the sulfurous gas that produces will with frozen metal liquid not in react with the strong magnesium of sulphur affinity, rare earth etc. and form sulfide, thereby cause nodular iron casting top layer abnormal nodularizing, cause casting quality to descend.Employed common commercially available cast iron graphite alcohol-base paint can not prevent the sulfurizing phenomenon in actual production, generally by increasing the nodulizer consumption or adopting the curing agent that does not contain sulfonic acid to reduce abnormal structure, but the former significantly promotes production cost, and the latter can impel the moulding-sand property variation and other defect occur.
Summary of the invention:
Shield type coating provided by the invention can be used for the sand casting process of super-low carbon stainless steel spare or nodular iron casting, adopt the coating of specific fire-proof powder composition preparation, can absorb and shielding from gases such as the sulfur-bearing of sand mold (core), carbon, effectively prevent the carburetting of super-low carbon stainless steel cast(ing) surface, alleviate or to eliminate nodular iron casting surface globular graphite unusual, thereby guarantee the quality of foundry goods.
For achieving the above object, shield type coating composition of the present invention is made up of fire-proof powder composition, suspending agent, binding agent and carrier fluid, and described fire-proof powder composition comprises high temperature resistant component and functional component, and powder particles is 200～325 orders; The component of shield type coating cooperates by following mass ratio: 100 parts of fire-proof powder composition, 8～15 parts of suspending agents, 3～10 parts of binding agents, 30～80 parts of carrier fluids.
As technical scheme of the present invention, high temperature resistant component is a zirconium English powder in the described fire-proof powder composition, and mass fraction is 80%～95% of a fire-proof powder composition gross mass; Functional component is at least a in potassic feldspar, albite, spodumene, the pyrophyllite, and mass fraction is 5%～20% of a fire-proof powder composition gross mass.Described suspending agent is at least a in sodium bentonite, lithium bentonite, rectorite, sepiolite, the attapulgite.Described binding agent is a kind of in waterglass, Ludox, silester or the aluminum phosphate.Described carrier fluid is a water.
Another kind of technical scheme of the present invention, high temperature resistant component is a graphite powder in the described fire-proof powder composition, mass fraction is 50%～70% of a fire-proof powder composition gross mass; Functional component is at least a in calcium carbonate, lime stone, chalk, calcium oxide, forsterite, magnesia powder, talcum powder, the magnesia, and mass fraction is 30%～50% of a fire-proof powder composition gross mass.Described suspending agent is at least a in organobentonite, lithium bentonite, the attapulgite.Described binding agent is at least a in rosin, phenolic resins, the polyvinyl butyral resin.Described carrier fluid is at least a in ethanol, methyl alcohol, the isopropyl alcohol.
The step of preparation process of shield type coating of the present invention is: respectively binding agent and suspending agent are added in the carrier fluid earlier, dispersed with stirring 10～15min in high speed dispersor, add fire-proof powder composition again and continue to stir 20～30min, be uniform pulpous state suspended dispersed system to coating.
Refractory powder is the key material that finally works on metal-sand mold interface in the mo(u)ld blacking, and promptly the character of refractory powder has determined the character of coating.The present invention is directed to super-low carbon stainless steel spare and nodular iron casting, select high temperature resistant component---zirconium English powder and graphite powder all have good chemical stability and resistance to elevated temperatures, promptly not with molten metal generation chemical reaction, and refractoriness height, thus help preventing foundry goods scab.
The selection of functional component in the refractory powder then needs to accept or reject according to the characteristics of different metal material:
Shield type coating for super-low carbon stainless steel spare, the silicate of selected alkali metal containing oxide in the functional material (feldspar, spodumene), the alkali metal oxide that goes out because of its pyrolytic has stronger fluxing action, can clog coating porosity, and improves its density; And the pyrophyllite component at high temperature also has the good agglomeration that helps.With the combination of zirconium English powder and above-mentioned functions constituent optimization, form and have higher refractoriness and, impel zirconium English powder particles when lower temperature, to sinter fine and close sinter layer into, thereby stoped the carburetting on super-low carbon stainless steel spare surface than the multicomponent system of low fever's node.
Shield type coating for nodular iron casting, adopt calcic (calcium carbonate, lime stone, chalk, calcium oxide) and contain magnesium (forsterite, magnesia powder, talcum powder, magnesia) alkaline inorganic compound is as functional component, this is because the alkali metal (Ca that the thermal decomposition of high temperature when cast alkaline inorganic compound is generated, Mg) reaction of the sulfurous gas in oxide and the sand mold (core), has the effect that absorbs sulfurous gas, the sulfurous gas that formed dense coating of while also can completely cut off casting mold thermal decomposition generation contacts with surface metal liquid, therefore the abnormal structure at foundry goods-sand mold interface is obviously reduced.
Hence one can see that, the present invention is prepared into the shield type mo(u)ld blacking by selecting reasonable fire-proof powder composition for use, not only reach good anti-stick sand effect, also can effectively prevent simultaneously surface carburetting of super-low carbon stainless steel spare and nodular iron casting surface sulfurizing defective, thereby reach the purpose that guarantees casting quality.
The specific embodiment:
Embodiment 1
Fire-proof powder composition: zirconium English powder 95kg, spodumene 5kg; Suspending agent: lithium bentonite 8kg; Binding agent: Ludox 8kg; Carrier fluid: water 30kg.
Embodiment 2
Fire-proof powder composition: zirconium English powder 90kg, potassic feldspar 10kg; Suspending agent: rectorite 9kg; Binding agent: silester 3kg; Carrier fluid: water 35kg.
Embodiment 3
Fire-proof powder composition: zirconium English powder 85kg, pyrophyllite 10kg, albite 5kg; Suspending agent: sodium bentonite 5kg, attapulgite 5kg; Binding agent: waterglass 5kg; Carrier fluid: water 45kg.
Embodiment 4
Fire-proof powder composition: zirconium English powder 80kg, pyrophyllite 10kg, spodumene 10kg; Suspending agent: sepiolite 6kg, attapulgite 3kg; Binding agent: aluminum phosphate 10kg; Carrier fluid: water 50kg.
Embodiment 1～embodiment 4 shield type water based paint preparation technologies: respectively binding agent and suspending agent are added in the entry earlier, dispersed with stirring 10～15min in high speed dispersor, add fire-proof powder composition again and continue to stir 20～30min, be uniform pulpous state suspended dispersed system to coating.
Shield type water based paint pouring experiment: on the waterglass sand mold, apply earlier the commercially available Zircon powder alcohol group dope of one deck respectively, light the water based paint that makes by each brushing one deck embodiment 1～embodiment 4 of type again after the drying, simultaneously with the sand mold of the commercially available zirconium English of brushing one deck powder water based paint as a comparison case 1, oven dry back mould assembling cast super-low carbon stainless steel spare (requiring foundry goods phosphorus content≤0.08%).Take a sample in distance cast(ing) surface 0.5mm depths and carry out the phosphorus content spectrum analysis in unpacking back, result of the test sees Table 1.By data in the table as can be known, the foundry goods case case carbon is low more, and the anti-carburizing effect of coating is good more.
Embodiment 5
Fire-proof powder composition: graphite powder 79kg, calcium carbonate 21kg; Suspending agent: organobentonite 7kg, attapulgite 4kg; Binding agent: phenolic resins 2.7kg, polyvinyl butyral resin 0.3kg; Carrier fluid: isopropyl alcohol 60kg.
Embodiment 6
Fire-proof powder composition: graphite powder 72kg, calcium oxide 8kg, talcum powder 10kg; Suspending agent: organobentonite 8kg, lithium bentonite 7kg; Binding agent: rosin 3.5kg, phenolic resins 3.5kg; Carrier fluid: isopropyl alcohol 40kg, methyl alcohol 25kg.
Embodiment 7
Fire-proof powder composition: graphite powder 65kg, chalk 10kg, magnesia powder 25kg; Suspending agent: lithium bentonite 8kg, attapulgite 5kg; Binding agent: rosin 4.7kg, phenolic resins 3.2kg, polyvinyl butyral resin 1.1kg; Carrier fluid: ethanol 40kg, methyl alcohol 30kg.
Embodiment 8
Fire-proof powder composition: graphite powder 58kg, lime stone 30kg, magnesia 12kg; Suspending agent: lithium bentonite 12kg; Binding agent: rosin 4.3kg, polyvinyl butyral resin 0.7kg; Carrier fluid: ethanol 75kg.
Embodiment 9
Fire-proof powder composition: graphite powder 50kg, calcium carbonate 25kg, forsterite 25kg; Suspending agent: organobentonite 14kg; Binding agent: rosin 3.4kg, phenolic resins 5.1kg, polyvinyl butyral resin 1.5kg; Carrier fluid: ethanol 40kg, methyl alcohol 20kg, isopropyl alcohol 20kg.
Embodiment 5～embodiment 9 shield type alcohol-base paint preparation technologies: respectively binding agent and suspending agent are added in the alcohols carrier fluid earlier, dispersed with stirring 10～15min in high speed dispersor, add fire-proof powder composition again and continue to stir 20～30min, be uniform pulpous state suspended dispersed system to coating.
Shield type alcohol-base paint pouring experiment: on the furan resin self curing sand type, apply the alcohol-base paint that embodiment 5～embodiment 9 makes by type respectively, simultaneously, light dry back mould assembling cast nodular iron casting (requiring the foundry goods nodulizing grade is 1～3 grade) with the sand mold of brushing commercially available graphite powder alcohol-base paint as a comparison case 2.Take a sample on the foundry goods top layer and carry out the graphite form Metallographic Analysis in unpacking back, result of the test sees Table 2.By data in the table as can be known, foundry goods top layer flake graphite layer depth scope is more little, and the anti-sulfurizing effect of coating is good more.
The foregoing description can carry out multiple combination, so long as in above-mentioned scope of the present invention, can prepare the sand casting shield type coating.
Table 1
| Coating type | Case case carbon (mass fraction) |
| Embodiment 1 | ??0.072％ |
| Embodiment 2 | ??0.080％ |
| Embodiment 3 | ??0.075％ |
| Embodiment 4 | ??0.076％ |
| Comparative Examples 1 | ??0.135％ |
Table 2
| Coating type | Top layer flake graphite layer depth |
| Embodiment 5 | ??0.07～0.12mm |
| Embodiment 6 | ??0～0.05mm |
| Embodiment 7 | ??0～0.06mm |
| Embodiment 8 | ??0～0.02mm |
| Embodiment 9 | ??0～0.02mm |
| Comparative Examples 2 | ??0.25～0.48mm |
Claims (7)
1. a shield type coating composition is made up of fire-proof powder composition, suspending agent, binding agent and carrier fluid, it is characterized in that described fire-proof powder composition comprises high temperature resistant component and functional component, and granularity is 200～325 orders.
2. shield type coating composition according to claim 1 is characterized in that each component cooperates by following mass ratio: 100 parts of fire-proof powder composition, 8～15 parts of suspending agents, 3～10 parts of binding agents, 30～80 parts of carrier fluids.
3. shield type coating composition according to claim 2 is characterized in that the high temperature resistant component in the described fire-proof powder composition is a zirconium English powder, and mass fraction is 80%～95% of a fire-proof powder composition gross mass; Functional component is at least a in potassic feldspar, albite, spodumene, the pyrophyllite, and mass fraction is 5%～20% of a fire-proof powder composition gross mass.
4. shield type coating composition according to claim 3 is characterized in that described suspending agent is at least a in sodium bentonite, lithium bentonite, rectorite, sepiolite, the attapulgite; Described binding agent is a kind of in waterglass, Ludox, silester or the aluminum phosphate; Described carrier fluid is a water.
5. shield type coating composition according to claim 2 is characterized in that the high temperature resistant component in the described fire-proof powder composition is a graphite powder, and mass fraction is 50%～70% of a fire-proof powder composition gross mass; Functional component is at least a in calcium carbonate, lime stone, chalk, calcium oxide, forsterite, magnesia powder, talcum powder, the magnesia, and mass fraction is 30%～50% of a fire-proof powder composition gross mass.
6. shield type coating composition according to claim 5 is characterized in that described suspending agent is at least a in organobentonite, lithium bentonite, the attapulgite; Described binding agent is at least a in rosin, phenolic resins, the polyvinyl butyral resin; Described carrier fluid is at least a in ethanol, methyl alcohol, the isopropyl alcohol.
7. the preparation technology of a shield type coating, it is characterized in that described processing step is: respectively binding agent and suspending agent are added in the carrier fluid earlier, dispersed with stirring 10～15min in high speed dispersor, add fire-proof powder composition again and continue to stir 20～30min, be uniform pulpous state suspended dispersed system to coating.
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| CN 201010139412 CN101817058A (en) | 2010-03-30 | 2010-03-30 | Shield type coating composition and preparation process of coating thereof |
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