CN115926549A - Lost foam coating for cast iron and preparation method thereof - Google Patents
Lost foam coating for cast iron and preparation method thereof Download PDFInfo
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- CN115926549A CN115926549A CN202211596194.7A CN202211596194A CN115926549A CN 115926549 A CN115926549 A CN 115926549A CN 202211596194 A CN202211596194 A CN 202211596194A CN 115926549 A CN115926549 A CN 115926549A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention discloses a lost foam coating for cast iron, which comprises the following components: the coating comprises, by weight, 19.8% -20.2% of water, 46.8% -47.8% of kaolin/200, 18.1% -18.5% of kaolin/140 and 3.31% -3.37% of vinyl acetate-ethylene copolymer emulsion. The lost foam coating for cast iron and the preparation method thereof have the advantages that the prepared lost foam coating has excellent suspension property, wider use viscosity, excellent coating property, proper fluidity and yield property, can ensure that the coating is uniform and smooth, is not easy to crack and crack at high temperature, has higher rigidity and wear resistance at normal temperature and high temperature, has high-temperature strength, good compatibility with a model, does not generate corrosion, does not fall off, does not react with high-temperature molten metal, and has good surface finish gradually.
Description
Technical Field
The invention belongs to the technical field of lost foam coating, and particularly relates to a lost foam coating for cast iron and a preparation method thereof.
Background
The lost foam casting is a casting process that EPS foam plastic moulds with the same size as a casting are bonded and combined into a model cluster, lost foam coating is coated and hung, the model cluster is placed in a sand box after being dried and is filled with materials such as silica sand without adhesive, fused ceramic sand and the like, a vacuumizing technology is combined, molten metal is poured to gasify the foam plastic moulds, then the molten metal occupies the space of the original foam plastic, and the casting is formed by cooling and solidifying. The lost foam coating is important in the lost foam casting process because the lost foam coating directly affects the quality of the casting. However, the commercial coating prepared by the existing specialized manufacturers is expensive, and the coating independently developed by the general foundry enterprises has certain limitations, such as poor suspension stability of the coating, poor stripping property of the cast coating, air holes on the surface of the casting, sand adhesion and the like. The common lost foam coating has the problems that the box is easy to collapse due to low high-temperature strength during casting, the surface defect of a casting is caused by poor high-temperature air permeability and incomplete discharge of a decomposition product of foam plastic, the casting is easy to sand and is difficult to clean, and the like.
The conventional solution is to increase the painting times of the surface coating of the foam plastic mould and improve the coating strength by increasing the thickness of the coating. However, after the thickness of the coating is increased, the air permeability of the coating is reduced, gas generated by foam gasification cannot be discharged in time, and the decomposition is insufficient, so that the defects of slag inclusion, local carburization, air holes on the surface of a cast and the like of the cast are caused after casting; in addition, the thickening of the coating layer can also cause the local slow heat dissipation of the casting, so that the casting is unevenly solidified to generate deformation, and further the size and the mechanical property of the casting are influenced.
Disclosure of Invention
To solve the problems set forth in the background art described above. The invention provides a lost foam coating for cast iron and a preparation method thereof.
In order to achieve the purpose, the invention provides the following technical scheme: a lost foam coating for cast iron, comprising: the coating comprises water, kaolin/200, kaolin/140, vinyl acetate-ethylene copolymer emulsion and additives, wherein the water accounts for 19.8-20.2% of the total weight of the coating, the kaolin/200 accounts for 46.8-47.8% of the total weight of the coating, the kaolin/140 accounts for 18.1-18.5% of the total weight of the coating, and the vinyl acetate-ethylene copolymer emulsion accounts for 3.31-3.37% of the total weight of the coating;
the kaolin/200 and the kaolin/140 are both hydrothermally altered kaolin;
the vinyl acetate-ethylene copolymer emulsion is prepared by mixing modified GW-705 and GW-9208 as raw materials;
the additive comprises formaldehyde, a defoaming agent, magnesium aluminum silicate, phosphoric acid, a dispersing agent NNO, sodium sulfosuccinate and alkaline pinkish green.
In a preferred embodiment of the invention, the formaldehyde accounts for 0.31-0.39% of the total weight of the coating, and the defoaming agent accounts for 0.3% of the total weight of the coating.
In a preferred embodiment of the invention, the magnesium aluminum silicate accounts for 1.17-1.19% of the total weight of the coating, and the phosphoric acid accounts for 0.1% of the total weight of the coating.
In a preferred embodiment of the invention, the dispersant NNO accounts for 0.15 percent of the total weight of the coating, the sodium sulfosuccinate accounts for 0.05 percent of the total weight of the coating, and the alkali pinkish green accounts for 0.024 percent of the total weight of the coating.
In a preferred embodiment of the invention, the coating further comprises polyvinyl alcohol premixed in the kaolin/200 and the kaolin/140, wherein the polyvinyl alcohol accounts for 6.21-6.32% of the total weight of the coating.
A preparation method of a lost foam coating for cast iron comprises the following steps,
a1, mixing water, kaolin/200 and kaolin/140 according to a proportion to prepare a mixture;
a2, adding vinyl acetate-ethylene copolymer emulsion into the mixture prepared in A1, and fully mixing;
a3, adding additives and fully mixing;
and A4, introducing the mixture in the A3 into a jointing device to form a paste coating.
In a preferred embodiment of the present invention, the defoaming agent can be selected from a defoaming agent selected from silicone emulsion, a higher alcohol fatty acid ester complex, polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropylene amine ether, polyoxypropylene glycerol ether and polyoxypropylene polyoxyethylene glycerol ether, or polydimethylsiloxane.
In a preferred embodiment of the present invention, the mixture in A1 is stirred at a high speed of 700r/min for 60min and then at a low speed of 80r/min for 180min.
In a preferred embodiment of the present invention, the A2 is mixed and stirred at a high speed of 450r/min for 30min.
In a preferred embodiment of the invention, the components of the additive in A3 are added in the order of formaldehyde, phosphoric acid, magnesium aluminum silicate, dispersant NNO, sodium sulfosuccinate, alkaline pinkish green and defoamer.
The invention solves the defects in the background technology, and has the following beneficial effects:
1. the prepared lost foam coating has excellent suspension property, wider use viscosity, excellent coating property, proper fluidity and yield property, can ensure that the coating is uniform and smooth, is not easy to crack and not crack at high temperature, has higher rigidity and wear resistance at normal temperature and high temperature, has high-temperature strength, good affinity with a model, does not corrode, does not fall off, does not react with high-temperature molten metal, and has good surface finish gradually.
2. According to the lost foam coating for cast iron and the preparation method thereof, magnesium aluminum silicate is swelled to form gel, so that the coating is prevented from being accumulated and sinking, the suspension property of the coating is improved, and the defoaming agent can eliminate a large amount of bubbles generated by the coating in the mixing process, so that the overall quality of the coating is improved.
3. According to the lost foam coating for cast iron and the preparation method thereof, proper coating components are selected, the content of the coating components is adjusted, and a proper mixing process is adopted, so that the normal-temperature and high-temperature strength, proper high-temperature air permeability, good flow parallelism, suspension property and brushing property of the coating are completely met, and a qualified casting is obtained. The coating is suitable for different types of gray iron castings, and the coating is gradually and automatically peeled off in the casting cooling process, so that the casting cleaning process is greatly simplified and saved, and the casting surface is smooth and clean.
Detailed Description
The present invention will now be described in further detail with reference to examples.
A lost foam coating for cast iron, comprising: the coating comprises water, kaolin/200, kaolin/140, vinyl acetate-ethylene copolymer emulsion and additives, wherein the water accounts for 19.8-20.2% of the total weight of the coating, the kaolin/200 accounts for 46.8-47.8% of the total weight of the coating, the kaolin/140 accounts for 18.1-18.5% of the total weight of the coating, and the vinyl acetate-ethylene copolymer emulsion accounts for 3.31-3.37% of the total weight of the coating.
The prepared lost foam coating has excellent suspension property, wider use viscosity, excellent coating property, proper fluidity and yield property, can ensure that the coating is uniform and smooth, is not easy to crack and not crack at high temperature, has higher rigidity and wear resistance at normal temperature and high temperature, has high-temperature strength, good affinity with a model, does not corrode, does not fall off, does not react with high-temperature molten metal, and has good surface finish gradually.
The kaolin/200 and the kaolin/140 are both hydrothermally altered kaolin; the vinyl acetate-ethylene copolymer emulsion is prepared by mixing modified GW-705 and GW-9208 as raw materials; the additive comprises formaldehyde, a defoaming agent, magnesium aluminum silicate, phosphoric acid, a dispersing agent NNO, sodium sulfosuccinate and alkaline green; according to the lost foam coating for cast iron and the preparation method thereof, magnesium aluminum silicate is swelled to form gel, so that the coating is prevented from being accumulated and sinking, the suspension property of the coating is improved, and the defoaming agent can eliminate a large amount of bubbles generated by the coating in the mixing process, so that the overall quality of the coating is improved.
The formaldehyde accounts for 0.31-0.39% of the total weight of the coating, and the defoaming agent accounts for 0.3% of the total weight of the coating; the magnesium aluminum silicate accounts for 1.17-1.19% of the total weight of the coating, and the phosphoric acid accounts for 0.1% of the total weight of the coating; the dispersant NNO accounts for 0.15 percent of the total weight of the coating, the sodium sulfosuccinate accounts for 0.05 percent of the total weight of the coating, and the alkaline pingreen accounts for 0.024 percent of the total weight of the coating; the coating also comprises polyvinyl alcohol premixed in the kaolin/200 and the kaolin/140, wherein the polyvinyl alcohol accounts for 6.21-6.32% of the total weight of the coating.
The lost foam coating for cast iron and the preparation method thereof completely meet the requirements of normal temperature and high temperature strength, proper high temperature air permeability, good flow parallelism, suspension property and brushing property of the coating by selecting proper coating components, adjusting the content and proper mixing process, thereby obtaining qualified castings. The coating is suitable for gray iron castings of different models, and the coating gradually and automatically peels off in the casting cooling process, so that the casting cleaning process is greatly simplified and saved, and the casting surface is smooth and clean.
A preparation method of a lost foam coating for cast iron comprises the following steps,
a1, mixing water, kaolin/200 and kaolin/140 according to a proportion to prepare a mixture;
a2, adding vinyl acetate-ethylene copolymer emulsion into the mixture prepared in A1, and fully mixing;
a3, adding an additive and fully mixing;
and A4, introducing the mixture in the A3 into a jointing device to form a paste coating.
The defoaming agent can be any one of emulsified silicone oil, higher alcohol fatty acid ester compound, polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropylene amine ether, polyoxypropylene glycerol ether, polyoxypropylene polyoxyethylene glycerol ether or polydimethylsiloxane.
The mixture in A1 is stirred at high speed of 700r/min for 60min and then at low speed of 80r/min for 180min.
The mixture in A2 is stirred at a high speed of 450r/min for 30min.
The additive in A3 comprises formaldehyde, phosphoric acid, magnesium aluminum silicate, a dispersant NNO, sodium sulfosuccinate, alkaline pinkish green and a defoaming agent in the adding sequence.
The invention also provides a preparation method of the lost foam coating for cast iron, which comprises the following steps:
a1, mixing water, kaolin/200 and kaolin/140 according to a proportion to prepare a mixture;
a2, adding vinyl acetate-ethylene copolymer emulsion into the mixture prepared in A1, and fully mixing;
a3, adding an additive and fully mixing;
and A4, introducing the mixture in the A3 into a jointing device to form a paste coating.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description herein, the description of the terms "one embodiment," "some embodiments," "an embodiment," "an example," "a specific example" or "some examples" or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example.
Although embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are exemplary and not to be construed as limiting the present invention and that those skilled in the art may make modifications, alterations, substitutions and alterations to the above embodiments within the scope of the present invention.
Claims (10)
1. A lost foam coating for cast iron, comprising: the coating comprises water, kaolin/200, kaolin/140, vinyl acetate-ethylene copolymer emulsion and additives, and is characterized in that the water accounts for 19.8-20.2% of the total weight of the coating, the kaolin/200 accounts for 46.8-47.8% of the total weight of the coating, the kaolin/140 accounts for 18.1-18.5% of the total weight of the coating, and the vinyl acetate-ethylene copolymer emulsion accounts for 3.31-3.37% of the total weight of the coating;
the kaolin/200 and the kaolin/140 are both hydrothermally altered kaolin;
the vinyl acetate-ethylene copolymer emulsion is prepared by mixing modified GW-705 and GW-9208 as raw materials;
the additive comprises formaldehyde, a defoaming agent, magnesium aluminum silicate, phosphoric acid, a dispersing agent NNO, sodium sulfosuccinate and alkaline pinkish green.
2. The lost foam coating for cast iron according to claim 1, characterized in that: the formaldehyde accounts for 0.31-0.39% of the total weight of the coating, and the defoaming agent accounts for 0.3% of the total weight of the coating.
3. The lost foam coating for cast iron according to claim 1, characterized in that: the magnesium aluminum silicate accounts for 1.17-1.19% of the total weight of the coating, and the phosphoric acid accounts for 0.1% of the total weight of the coating.
4. The lost foam coating for cast iron according to claim 1, characterized in that: the dispersant NNO accounts for 0.15 percent of the total weight of the coating, the sodium sulfosuccinate accounts for 0.05 percent of the total weight of the coating, and the alkaline pingreen accounts for 0.024 percent of the total weight of the coating.
5. The lost foam coating for cast iron according to claim 1, characterized in that: the coating also comprises polyvinyl alcohol premixed in the kaolin/200 and the kaolin/140, wherein the polyvinyl alcohol accounts for 6.21-6.32% of the total weight of the coating.
6. A preparation method of lost foam coating for cast iron is characterized by comprising the following steps: comprises the following steps of (a) preparing a solution,
a1, mixing water, kaolin/200 and kaolin/140 according to a proportion to prepare a mixture;
a2, adding vinyl acetate-ethylene copolymer emulsion into the mixture prepared in A1, and fully mixing;
a3, adding an additive and fully mixing;
and A4, introducing the mixture in the A3 into a jointing device to form a paste coating.
7. The method for preparing a lost foam coating for cast iron according to claim 6, wherein: the defoaming agent can be any one of emulsified silicone oil, higher alcohol fatty acid ester compound, polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropylene amine ether, polyoxypropylene glycerol ether, polyoxypropylene polyoxyethylene glycerol ether or polydimethylsiloxane.
8. The method for preparing a lost foam coating for cast iron according to claim 6, wherein: the mixture in A1 is stirred at high speed of 700r/min for 60min and then at low speed of 80r/min for 180min.
9. The method for preparing a lost foam coating for cast iron according to claim 6, wherein: the mixture in A2 is stirred at a high speed of 450r/min for 30min.
10. The method for preparing a lost foam coating for cast iron according to claim 6, wherein: the additive in A3 comprises formaldehyde, phosphoric acid, magnesium aluminum silicate, a dispersant NNO, sodium sulfosuccinate, alkaline pinkish green and a defoaming agent in the adding sequence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211596194.7A CN115926549A (en) | 2022-12-12 | 2022-12-12 | Lost foam coating for cast iron and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211596194.7A CN115926549A (en) | 2022-12-12 | 2022-12-12 | Lost foam coating for cast iron and preparation method thereof |
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| CN115926549A true CN115926549A (en) | 2023-04-07 |
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