CN111531120A - Preparation method of novel casting coating - Google Patents
Preparation method of novel casting coating Download PDFInfo
- Publication number
- CN111531120A CN111531120A CN202010344203.8A CN202010344203A CN111531120A CN 111531120 A CN111531120 A CN 111531120A CN 202010344203 A CN202010344203 A CN 202010344203A CN 111531120 A CN111531120 A CN 111531120A
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- parts
- graphite
- forsterite
- stirrer
- stirring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
Abstract
The invention discloses a preparation method of a novel casting coating, which relates to the field of casting coatings and comprises the following raw materials: 20-30 parts of graphite, 25-35 parts of forsterite, 5-10 parts of bentonite, 20-40 parts of a filler, 3-5 parts of a defoaming agent, 2-5 parts of quartz sand and 20-30 parts of water. The invention reduces the proportion of graphite in the coating, reduces the adhesive force between the coating and the surface of the die and is easy to clean because the using amount of the forsterite is increased, thereby greatly reducing the possibility of generating air holes by the graphite. Meanwhile, due to rich sources and low price of the forsterite, the production cost is reduced.
Description
Technical Field
The invention relates to the field of casting coatings, in particular to a manufacturing method of a novel casting coating.
Background
Casting coating: the cast product is melted and then cast onto a metal mold, and the product is separated (demolded) from the mold. For demolding, a layer of liquid containing a refractory material, i.e., a coating, is sprayed on the mold in advance.
The coating comprises the following components: the coating used in casting production mainly comprises refractory materials, dispersion media, binders, suspending agents and the like. Where the actual function is to be refractory. Different refractory compositions will have different effects on the quality of the cast product. The composition of the coating is very critical.
The currently used coating is easy to adhere to a mold, is not easy to dry and difficult to clean, so that air holes and slag inclusion are easy to generate during casting, the product quality is influenced, and the cost is high.
Disclosure of Invention
The invention aims to: in order to solve the problems that air holes and slag inclusion are easy to generate during casting, the product quality is affected, and the cost is high, a novel manufacturing method of the casting coating is provided.
In order to achieve the purpose, the invention provides the following technical scheme: a manufacturing method of a novel casting coating comprises the following raw materials:
20-30 parts of graphite, 25-35 parts of forsterite, 5-10 parts of bentonite, 20-40 parts of a filler, 3-5 parts of a defoaming agent, 2-5 parts of quartz sand and 20-30 parts of water.
Preferably, the defoaming agent is one of silicone emulsion, higher alcohol fatty acid ester complex, polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropylene amine ether, polyoxypropylene glycerol ether, polyoxypropylene polyoxyethylene glycerol ether and polydimethylsiloxane.
Preferably, the graphite is formed by mixing artificial graphite and crystalline flake graphite in a ratio of 3:8, the crystalline flake graphite is one of ores with the best floatability in nature, high-grade graphite concentrate can be obtained by excessive grinding and selection, the floatability, the lubricity and the plasticity of the graphite are superior to those of other types of graphite, the artificial graphite has the advantages of low cost and good performance, the production cost is reduced on the premise of not influencing products, and the high-temperature demolding performance of the mold is effectively improved while the coating has heat preservation. The flake graphite attached to the thermal insulation aggregate through the adhesive also adjusts the proportion of the aggregate to a certain extent, so that the suspension property of the coating is improved.
Preferably, the filler is one of 99% pure magnesium oxide, calcium oxide, light calcium carbonate, cryolite and polytetrafluoroethylene, the mesh number of the filler is more than or equal to 200 meshes, and the filler can effectively improve the heat-conducting property of the coating and prevent the coating from influencing the heat conductivity of casting.
Preferably, the mesh number of the quartz sand is 120 meshes, the quartz sand used alone has a heat preservation effect, but under a certain thickness requirement, such as the thickness of a coating of 0.5-1.0 mm, the coating has poor air permeability, so that the produced product has more sand hole defects, sometimes even reaching 20% -30%. After the diatomite and the quartz sand with the components and specifications are selected as the coating aggregate, the coating has excellent heat insulation and air permeability, the defect of sand holes of the product is effectively controlled, and the sand holes can reach below 0.3% when the sand holes are low.
Preferably, the top end of the sealing cover of the stirring machine is provided with an air outlet and a feed inlet, and the outer sides of the air inlet and the feed outlet are provided with valves, so that the problem that the health of an operator is harmed due to the fact that raw materials overflow under the action of air flow in the adding process of the raw materials is solved.
Preferably, the rotating speed of the stirrer is 500-900 r/min.
Preferably, the preparation method of the novel casting coating comprises the following steps:
the method comprises the following steps: respectively crushing graphite and forsterite to obtain graphite powder and forsterite powder;
step two: respectively sieving graphite powder and forsterite powder to obtain graphite powder and forsterite powder of more than 200 meshes;
adding water and pouring bentonite into the stirrer, and stirring for 30min to obtain a mixed solution;
step four: sealing the stirrer, opening an air outlet on a stirrer cover, connecting the stirrer cover with an air pump through a hose, pumping out redundant air in the stirrer, and then closing the air outlet;
step five: placing the substances to be added on a feeding hole, opening the feeding hole, adding quartz sand, graphite powder and forsterite powder into the mixed solution, stirring, adding the filler during stirring, and stirring for 80-90min to obtain a mixed raw material;
step five: adding a defoaming agent into the mixed raw materials, and stirring for 30-40min to obtain a finished product, wherein the surface tension is reduced in the processing process, and the foam generation is inhibited or eliminated, so that the product performance is better.
Compared with the prior art, the invention has the beneficial effects that: the invention reduces the proportion of graphite in the coating, reduces the adhesive force between the coating and the surface of the die, is easy to clean and greatly reduces the possibility of generating air holes by the graphite due to the increase of the using amount of the forsterite. Meanwhile, because the forsterite is rich in source and low in price, the reduction of the production cost is also helped.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A manufacturing method of a novel casting coating comprises the following raw materials:
20-30 parts of graphite, 25-35 parts of forsterite, 5-10 parts of bentonite, 20-40 parts of a filler, 3-5 parts of a defoaming agent, 2-5 parts of quartz sand and 20-30 parts of water.
Real-time example 1
As a preferred embodiment of the present invention: 20 parts of graphite, mesh number: 200 meshes, 25 parts of forsterite, 200 meshes, 5 parts of bentonite, and the mesh number is as follows: 300 meshes, 20 parts of filling material, 200 meshes, 3 parts of defoaming agent, 2 parts of quartz sand, 200 meshes and 20 parts of water.
Preparing the coating by using the raw materials: sieving graphite and forsterite, removing graphite and forsterite with larger particles, pouring water and bentonite into a stirrer for stirring, stirring for 30min, closing a sealing cover of the stirrer, opening an air outlet on a cover of the stirrer, connecting the air outlet with an air pump through a hose, pumping out redundant gas in the stirrer, then closing the air outlet, placing substances to be added on a feed inlet, opening the feed inlet, adding quartz sand, graphite powder and forsterite powder into a mixed solution for stirring, adding a filler during stirring, stirring for 80min to obtain a mixed raw material, adding a defoaming agent into the mixed raw material, and stirring for 30min to obtain a finished product.
The coating prepared by the embodiment can keep the organic combination of the components of the coating within 200h, and has no layering, no separation and no precipitation.
Example 2
As a preferred embodiment of the present invention: 22 parts of graphite, mesh number: 220 meshes, 27 parts of forsterite, 220 meshes, 6 parts of bentonite, and the mesh number is as follows: 350 meshes, 25 parts of filling material, 300 meshes, 3.5 parts of defoaming agent, 3 parts of quartz sand, 250 meshes and 23 parts of water.
Preparing the coating by using the raw materials: sieving graphite and forsterite, removing graphite and forsterite with larger particles, pouring water and bentonite into a stirrer for stirring, stirring for 30min, closing a sealing cover of the stirrer, opening an air outlet on a cover of the stirrer, connecting the air outlet with an air pump through a hose, pumping out redundant gas in the stirrer, then closing the air outlet, placing substances to be added on a feed inlet, opening the feed inlet, adding quartz sand, graphite powder and forsterite powder into a mixed solution for stirring, adding a filler during stirring, stirring for 80min to obtain a mixed raw material, adding a defoaming agent into the mixed raw material, and stirring for 30min to obtain a finished product.
The coating prepared by the embodiment can keep the organic combination of the components of the coating within 220h, and has no layering, no separation and no precipitation.
Example 3
As a preferred embodiment of the present invention: 25 parts of graphite, mesh number: 250 meshes, 29 parts of forsterite, 280 meshes, 7 parts of bentonite, and the mesh number is as follows: 350 meshes, 30 parts of filling material, 300 meshes, 4 parts of defoaming agent, 4 parts of quartz sand, 300 meshes and 25 parts of water.
Preparing the coating by using the raw materials: sieving graphite and forsterite, removing graphite and forsterite with larger particles, pouring water and bentonite into a stirrer for stirring, stirring for 30min, closing a sealing cover of the stirrer, opening an air outlet on a cover of the stirrer, connecting the air outlet with an air pump through a hose, pumping out redundant gas in the stirrer, then closing the air outlet, placing substances to be added on a feed inlet, opening the feed inlet, adding quartz sand, graphite powder and forsterite powder into a mixed solution for stirring, adding a filler during stirring, stirring for 80min to obtain a mixed raw material, adding a defoaming agent into the mixed raw material, and stirring for 30min to obtain a finished product.
The coating prepared by the embodiment can keep the organic combination of the components of the coating within 240 hours, and does not delaminate, separate and precipitate.
Example 4
As a preferred embodiment of the present invention: 27 parts of graphite, mesh number: 300 meshes, 31 parts of forsterite, 320 meshes, 8 parts of bentonite, and the mesh number is as follows: 400 meshes, 33 parts of filling material, 350 meshes, 4.5 parts of defoaming agent, 4.5 parts of quartz sand, 320 meshes and 27 parts of water.
Preparing the coating by using the raw materials: sieving graphite and forsterite, removing graphite and forsterite with larger particles, pouring water and bentonite into a stirrer for stirring, stirring for 30min, closing a sealing cover of the stirrer, opening an air outlet on a cover of the stirrer, connecting the air outlet with an air pump through a hose, pumping out redundant gas in the stirrer, then closing the air outlet, placing substances to be added on a feed inlet, opening the feed inlet, adding quartz sand, graphite powder and forsterite powder into a mixed solution for stirring, adding a filler during stirring, stirring for 80min to obtain a mixed raw material, adding a defoaming agent into the mixed raw material, and stirring for 30min to obtain a finished product.
The coating prepared by the embodiment can keep the organic combination of the components of the coating within 260 hours, and does not delaminate, separate and precipitate.
Example 5
As a preferred embodiment of the present invention: 29 parts of graphite, mesh number: 350 meshes, 33 parts of forsterite, 330 meshes, 9 parts of bentonite, and the mesh number is as follows: 450 meshes, 34 parts of filling material, 350 meshes, 4.5 parts of defoaming agent, 4.5 parts of quartz sand, 320 meshes and 28 parts of water.
Preparing the coating by using the raw materials: sieving graphite and forsterite, removing graphite and forsterite with larger particles, pouring water and bentonite into a stirrer for stirring, stirring for 30min, closing a sealing cover of the stirrer, opening an air outlet on a cover of the stirrer, connecting the air outlet with an air pump through a hose, pumping out redundant gas in the stirrer, then closing the air outlet, placing substances to be added on a feed inlet, opening the feed inlet, adding quartz sand, graphite powder and forsterite powder into a mixed solution for stirring, adding a filler during stirring, stirring for 80min to obtain a mixed raw material, adding a defoaming agent into the mixed raw material, and stirring for 30min to obtain a finished product.
The coating prepared by the embodiment can keep the organic combination of the components of the coating within 280h, and does not delaminate, separate and precipitate.
Example 6
As a preferred embodiment of the present invention: 30 parts of graphite, mesh number: 400 meshes, 35 parts of forsterite, 350 meshes, 10 parts of bentonite, and the mesh number is as follows: 450 meshes, 35 parts of filling material, 400 meshes, 5 parts of defoaming agent, 5 parts of quartz sand, 350 meshes and 30 parts of water.
Preparing the coating by using the raw materials: sieving graphite and forsterite, removing graphite and forsterite with larger particles, pouring water and bentonite into a stirrer for stirring, stirring for 30min, closing a sealing cover of the stirrer, opening an air outlet on a cover of the stirrer, connecting the air outlet with an air pump through a hose, pumping out redundant gas in the stirrer, then closing the air outlet, placing substances to be added on a feed inlet, opening the feed inlet, adding quartz sand, graphite powder and forsterite powder into a mixed solution for stirring, adding a filler during stirring, stirring for 80min to obtain a mixed raw material, adding a defoaming agent into the mixed raw material, and stirring for 30min to obtain a finished product.
The coating prepared by the embodiment can keep the organic combination of the components of the coating within 300h, and has no layering, no separation and no precipitation.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (8)
1. A manufacturing method of a novel casting coating is characterized by comprising the following steps: the method comprises the following raw materials:
20-30 parts of graphite, 25-35 parts of forsterite, 5-10 parts of bentonite, 20-40 parts of a filler, 3-5 parts of a defoaming agent, 2-5 parts of quartz sand and 20-30 parts of water.
2. The method for preparing the novel casting coating according to claim 1, wherein the method comprises the following steps: comprises the following steps:
the method comprises the following steps: respectively crushing graphite and forsterite to obtain graphite powder and forsterite powder;
step two: respectively sieving graphite powder and forsterite powder to obtain graphite powder and forsterite powder of more than 200 meshes;
adding water and pouring bentonite into the stirrer, and stirring for 30min to obtain a mixed solution;
step four: sealing the stirrer, opening an air outlet on a stirrer cover, connecting the stirrer cover with an air pump through a hose, pumping out redundant air in the stirrer, and then closing the air outlet;
step five: placing the substances to be added on a feeding hole, opening the feeding hole, adding quartz sand, graphite powder and forsterite powder into the mixed solution, stirring, adding the filler during stirring, and stirring for 80-90min to obtain a mixed raw material;
step five: adding a defoaming agent into the mixed raw materials, and stirring for 30-40min to obtain a finished product.
3. The method for preparing the novel casting coating according to claim 1, wherein the method comprises the following steps: the defoaming agent is one of emulsified silicone oil, a high-alcohol fatty acid ester compound, polyoxyethylene polyoxypropylene pentaerythritol ether, polyoxyethylene polyoxypropylene amine ether, polyoxypropylene glycerol ether, polyoxypropylene polyoxyethylene glycerol ether and polydimethylsiloxane.
4. The method for preparing the novel casting coating according to claim 1, wherein the method comprises the following steps: the graphite is prepared by mixing artificial graphite and crystalline flake graphite in a ratio of 3: 8.
5. The method for preparing the novel casting coating according to claim 1, wherein the method comprises the following steps: the filler is one of 99% pure magnesium oxide, calcium oxide, light calcium carbonate, cryolite and polytetrafluoroethylene, and the mesh number of the filler is more than or equal to 200 meshes.
6. The method for preparing the novel casting coating according to claim 1, wherein the method comprises the following steps: the mesh number of the quartz sand is 120 meshes.
7. The method for preparing the novel casting coating according to claim 2, wherein the method comprises the following steps: the top of the sealing cover of the stirrer is provided with an air outlet and a feed inlet, and the outer sides of the air inlet and the discharge outlet are provided with valves.
8. The method for preparing the novel casting coating according to claim 2, wherein the method comprises the following steps: the rotating speed of the stirrer is 500-900 r/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010344203.8A CN111531120A (en) | 2020-04-27 | 2020-04-27 | Preparation method of novel casting coating |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010344203.8A CN111531120A (en) | 2020-04-27 | 2020-04-27 | Preparation method of novel casting coating |
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| CN111531120A true CN111531120A (en) | 2020-08-14 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112275995A (en) * | 2020-09-22 | 2021-01-29 | 四川省宜宾普什集团有限公司 | Anti-sand-sticking water-based lost foam coating for gray iron casting, application and preparation method |
| CN116099979A (en) * | 2023-04-17 | 2023-05-12 | 山东鸿源新材料有限公司 | Metal mold coating for solving pinhole problem of aluminum alloy castings and preparation method thereof |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101152659A (en) * | 2006-09-25 | 2008-04-02 | 天津市振东涂料有限公司 | Method of producing low viscosity casting parts resin sand core casting paint |
| CN101343431A (en) * | 2007-07-12 | 2009-01-14 | 天津市振东涂料有限公司 | Preparation method for low-viscosity water-based dip applicating paint |
| CN102836949A (en) * | 2012-08-22 | 2012-12-26 | 成都银河动力有限公司 | Heat insulation spraying coating for centrifugally casting cylinder sleeve and manufacturing method of heat insulation spray coating |
| CN103286259A (en) * | 2013-07-03 | 2013-09-11 | 黄建荣 | Cristobalite lost foam casting coating and preparation method thereof |
| CN104550680A (en) * | 2015-01-01 | 2015-04-29 | 三峡大学 | Alcoholic-group coating |
| CN105537508A (en) * | 2016-01-12 | 2016-05-04 | 昆明理工大学 | Zinc ingot mold coating and preparation method |
| CN107052232A (en) * | 2017-06-28 | 2017-08-18 | 安徽华飞机械铸锻有限公司 | A kind of full-mold casting coating and preparation method thereof |
| CN107052231A (en) * | 2017-06-28 | 2017-08-18 | 安徽华飞机械铸锻有限公司 | A kind of full-mold casting coating and preparation method thereof |
| CN206837891U (en) * | 2017-03-31 | 2018-01-05 | 宁波大学 | A kind of mould wash mixer with sealing device and double agitating paddles |
-
2020
- 2020-04-27 CN CN202010344203.8A patent/CN111531120A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101152659A (en) * | 2006-09-25 | 2008-04-02 | 天津市振东涂料有限公司 | Method of producing low viscosity casting parts resin sand core casting paint |
| CN101343431A (en) * | 2007-07-12 | 2009-01-14 | 天津市振东涂料有限公司 | Preparation method for low-viscosity water-based dip applicating paint |
| CN102836949A (en) * | 2012-08-22 | 2012-12-26 | 成都银河动力有限公司 | Heat insulation spraying coating for centrifugally casting cylinder sleeve and manufacturing method of heat insulation spray coating |
| CN103286259A (en) * | 2013-07-03 | 2013-09-11 | 黄建荣 | Cristobalite lost foam casting coating and preparation method thereof |
| CN104550680A (en) * | 2015-01-01 | 2015-04-29 | 三峡大学 | Alcoholic-group coating |
| CN105537508A (en) * | 2016-01-12 | 2016-05-04 | 昆明理工大学 | Zinc ingot mold coating and preparation method |
| CN206837891U (en) * | 2017-03-31 | 2018-01-05 | 宁波大学 | A kind of mould wash mixer with sealing device and double agitating paddles |
| CN107052232A (en) * | 2017-06-28 | 2017-08-18 | 安徽华飞机械铸锻有限公司 | A kind of full-mold casting coating and preparation method thereof |
| CN107052231A (en) * | 2017-06-28 | 2017-08-18 | 安徽华飞机械铸锻有限公司 | A kind of full-mold casting coating and preparation method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112275995A (en) * | 2020-09-22 | 2021-01-29 | 四川省宜宾普什集团有限公司 | Anti-sand-sticking water-based lost foam coating for gray iron casting, application and preparation method |
| CN112275995B (en) * | 2020-09-22 | 2022-03-29 | 四川省宜宾普什集团有限公司 | Anti-sand-sticking water-based lost foam coating for gray iron casting, application and preparation method |
| CN116099979A (en) * | 2023-04-17 | 2023-05-12 | 山东鸿源新材料有限公司 | Metal mold coating for solving pinhole problem of aluminum alloy castings and preparation method thereof |
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Application publication date: 20200814 |