CN106694798B - A kind of powdery lost foam casting coating and its application method and application - Google Patents
A kind of powdery lost foam casting coating and its application method and application Download PDFInfo
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- CN106694798B CN106694798B CN201710110403.5A CN201710110403A CN106694798B CN 106694798 B CN106694798 B CN 106694798B CN 201710110403 A CN201710110403 A CN 201710110403A CN 106694798 B CN106694798 B CN 106694798B
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- Prior art keywords
- lost foam
- powdery
- foam casting
- coating
- powder
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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 kind of powdery lost foam casting coating and its application methods, each component is as follows by weight percentage in powder-type coating: refractory aggregate 88.9~89.7%, sodium bentonite 3.7~4.5%, polyvinyl alcohol 0.78~1.23%, aluminium dihydrogen phosphate 0.82~1.85%, sodium carboxymethylcellulose 0.32~0.44%, expanded graphite 3.8~4.8%.When preparation, above-mentioned all powders are added to blender is dry-mixed to uniform to get product powdery lost foam casting coating.In use, the water for accounting for powder-type coating weight percent 23.5~37% is first added in blender, starts blender, powder-type coating is slowly added into blender, be further continued for stirring 1 ~ 2 hour after adding material, can be used to the coating of evaporative pattern.Addition formaldehyde is not needed in raw material of the present invention can reach the effect saved and not degenerate for a long time, without adding surfactant in raw material, the trouble that defoaming agent is defoamed is added when avoiding subsequent use, finished product all has very high intensity in room temperature or high temperature, coating good permeability will not discharge noxious material.
Description
Technical field
The present invention relates to cast paints, more particularly to a kind of powdery lost foam casting coating and its application method, the painting
Expect it is safe and environment-friendly, never degenerate, good permeability, it is at low cost, it is easy to use.
Background technique
Lost foam casting coating is an indispensable ring in lost foam process.Coating is generally mentioned by specialized enterprises
For.Traditional lost foam paint is commonly made to dilute cream shape or dilution shape supply, needs pail pack, and inconvenience is recycled, coating poor air permeability,
Gaseous product of the bubbles model after high-temperature liquid metal effect gasification is difficult to escape, and casting is easy to produce gas class defect, coating
There is also rotten problems for storage process, because auxiliary agent is commonly using syrup or paper in the material that traditional lost foam paint uses
Slurry or white glue with vinyl are easy the moisture absorption, and gas-forming property is big, and dry tenacity is low, are easy to cause coating rotten, be generally needed to be added formaldehyde to prevent
Coating fermentation.But formaldehyde is toxic, not environmentally, will be slow using the formaldehyde in rear coating and evaporates and be absorbed by the body, it is right
Human body causes very big injury, general to require to be forbidden to use.It is also often used surfactant in traditional lost foam paint, is easy to produce
It needs to be defoamed with defoaming agent when giving birth to a large amount of bubbles, therefore preparing coating, not only deteriorates coating property in this way, and operate very numb
It is tired.
Summary of the invention
The present invention in view of the deficienciess of the prior art, provide it is a kind of it is safe and environment-friendly, storage is unlikely to deteriorate, thoroughly for a long time
Good powdery lost foam casting coating of gas and preparation method thereof and application method, resulting powder-type coating are as needed by user
Water is added to modulate, it is easy to use.
Technical solution provided by the invention is specific as follows:
A kind of powdery lost foam casting coating, including following components in percentage by weight:
The refractory aggregate be one or more of zirconium English powder, silica flour, mullite powder, schmigel, bauxite,
Granularity is 325 mesh.
The aluminium dihydrogen phosphate is powdered acid aluminum dihydrogen.
The polyvinyl alcohol is cold-water solution type, and granularity is 600~800 mesh.
The granularity of the expanded graphite is 1000 mesh.
A method of lost foam casting coating finished product, including following step are prepared using above-mentioned powdery lost foam casting coating
It is rapid: the powder in above-mentioned powdery lost foam casting coating being uniformly mixed, premix is obtained, is taken out spare；Then it will be equivalent to
The water of premix weight 23.5~37% is added in blender, starts blender, premix is slowly added into blender, stirs
1~2 hour to get lost foam casting coating finished product.
The principle of the present invention is specific as follows:
Polyvinyl alcohol has good normal-temperature bonding performance, and cold water solubles, itself has surface-active action, coating
It no longer needs to use special surfactant, condition of merchandise is powdery, and packaging is simple, and easy to use, polyvinyl alcohol can be burnt at high temperature
It loses, leaves channel in the coating, to improve coating's permeability, aluminium dihydrogen phosphate is also in powder, and ingredient is convenient, with polyvinyl alcohol one
Sample can be dissolved in cold water, can significantly improve the elevated temperature strength of coating, and have certain bactericidal effect, expanded graphite meets high volume
Tens times of even hundred times of expansions occur, is produced from coating, leaves duct, greatly improve the gas permeability of coating, be convenient for foam
The spilling of plastics high-temperature decomposition product reduces casting gas class defect.
Lost foam casting coating provided by the invention has the following advantages:
(1) ingredient of the present invention is convenient, and preparation process is simple；It fetches water on the spot when use, stirring can be configured to make under room temperature
With the coating of state.
(2) storage undergoes no deterioration formula of the invention for a long time, therefore does not need to prevent by addition formaldehyde in raw material
Fermentation.Traditional coating fermented at summer about 3 days and goes bad due to joined syrup or paper pulp, there is peculiar smell, and coating property deteriorates；
After coating of the present invention is tuned into use state, long-term storage is also without any variation.
(3) in raw material of the invention without adding other surfaces activating agent, thus need not also be added when use defoaming agent into
Row defoaming, it is easy to use.
(4) lost foam casting coating prepared by the present invention is packed with powdery, safe and reliable in transportational process, packaging and
Transportation cost is low.
(5) present invention has very high intensity in room temperature or high temperature, and coating good permeability will not discharge noxious material,
Safety and environmental protection.
Detailed description of the invention
Fig. 1 is the bubbles model after embodiment 1 is coated.
Fig. 2 is the casting that embodiment 1 is poured.
Fig. 3 is the bubbles model after embodiment 2 is coated.
Fig. 4 is the casting that embodiment 2 is poured.
Fig. 5 is the bubbles model that embodiment 3 is coated.
Fig. 6 is the casting that embodiment 3 is poured.
Specific embodiment
Technical solution of the present invention is further illustrated combined with specific embodiments below.
Embodiment 1
(1) prepare 65 kilograms of refractory powder zirconium English powder, it is spare；
(2) prepare 3 kilograms of sodium bentonite, 0.58 kilogram of polyvinyl alcohol, 0.6 kilogram of aluminium dihydrogen phosphate, carboxymethyl cellulose
0.32 kilogram of plain sodium, 3.5 kilograms of expanded graphite, it is spare；
(3) by dry-mixed 10 minutes in step (1) and the ready powder addition blender of step (2) to uniformly to get powder
Shape lost foam casting coating finished product；
In use, the water for accounting for powder-type coating weight percent 37% is added in blender, start blender, coating is slow
It is slow to be added in blender, after adding powder, it is further continued for stirring 1 hour, that is, can be used.
After bubbles model surface coating paint, 3 hours dry, taking-up is placed in 50 DEG C of drying boxes, and coating surface is smooth
Bright and clean, coating normal temperature strength is high, and finger can not wipe powder again.It coats repeatedly, is 3 times dry, burying sand and vacuumize casting, it is cooling
Afterwards, the defects of cast(ing) surface is without scab, stomata.Remaining coating stores 60 days without there is the rotten situation of fermentation.
Embodiment 2
(1) prepare 70 kilograms of refractory powder zirconium English powder, it is spare；
(2) it is fine to prepare 3.5 kilograms of sodium bentonite, 0.61 kilogram of polyvinyl alcohol, 0.64 kilogram of aluminium dihydrogen phosphate, carboxymethyl
Plain 0.25 kilogram of sodium, 3 kilograms of expanded graphite are tieed up, it is spare；
(3) by dry-mixed 15 minutes in step (1) and the ready powder addition blender of step (2) to uniformly to get powder
Shape lost foam casting coating finished product；
In use, the water for accounting for powder-type coating weight percent 28.2% is added in blender, start blender, by powdery
Coating is slowly added into blender, after adding powder, is further continued for stirring 1.5 hours, is obtained the coating of use state.
After bubbles model surface coating paint, 3 hours dry, taking-up is placed in 50 DEG C of drying boxes, and coating surface is smooth
Bright and clean, coating normal temperature strength is high, and finger can not wipe powder again.It coats repeatedly, is 3 times dry, burying sand and vacuumize casting, it is cooling
Afterwards, the defects of cast(ing) surface is without scab, stomata.Remaining coating stores 40 days without there is the rotten situation of fermentation.
Embodiment 3
(1) prepare 72 kilograms of refractory powder zirconium English powder, it is spare；
(2) prepare 3 kilograms of sodium bentonite, 1 kilogram of polyvinyl alcohol, 1.5 kilograms of aluminium dihydrogen phosphate, sodium carboxymethylcellulose
0.3 kilogram, 3.2 kilograms of expanded graphite, it is spare；
(3) by dry-mixed 20 minutes in step (1) and the ready powder addition blender of step (2) to uniformly to get powder
Shape lost foam casting coating finished product；
In use, the water for accounting for powder-type coating weight percent 23.5% is added in blender, start blender, by powdery
Coating is slowly added into blender, after adding powder, is further continued for stirring 2 hours, is obtained the coating of use state.
After bubbles model surface coating paint, 3 hours dry, taking-up is placed in 50 DEG C of drying boxes, and coating surface is smooth
Bright and clean, coating normal temperature strength is high, and finger can not wipe powder again.It coats repeatedly, is 3 times dry, burying sand and vacuumize casting, it is cooling
Afterwards, the defects of cast(ing) surface is without scab, stomata.Remaining coating stores 30 days without there is the rotten situation of fermentation.
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects
Detailed description be not limited to this hair it should be understood that the above is only a specific embodiment of the present invention
Bright, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should be included in the present invention
Protection scope within.
Claims (8)
1. a kind of powdery lost foam casting coating, which is characterized in that including following components in percentage by weight:
2. powdery lost foam casting coating according to claim 1, it is characterised in that: the refractory aggregate is zirconium English
One or more of powder, silica flour, mullite powder, schmigel, bauxite, granularity are 325 mesh.
3. powdery lost foam casting coating according to claim 1, it is characterised in that: the aluminium dihydrogen phosphate is powdery
Aluminium dihydrogen phosphate.
4. powdery lost foam casting coating according to claim 1, it is characterised in that: the polyvinyl alcohol is that cold water is molten
Solution type, granularity are 600~800 mesh.
5. powdery lost foam casting coating according to claim 1, it is characterised in that: the granularity of the expanded graphite is
1000 mesh.
6. a kind of prepare lost foam casting coating finished product using the described in any item powdery lost foam casting coatings of claim 1-5
Method, which comprises the following steps: will be in the described in any item powdery lost foam casting coatings of claim 1-5
Powder be uniformly mixed, obtain premix, take out spare；Then the water addition that will be equivalent to premix weight 23.5~37% is stirred
Mix in machine, start blender, premix is slowly added into blender, stir 1~2 hour to get lost foam casting coating at
Product.
7. a kind of lost foam casting coating finished product, it is characterised in that: be prepared by method of claim 6.
8. application of the powdery lost foam casting coating described in claim 1 in lost foam process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710110403.5A CN106694798B (en) | 2017-02-28 | 2017-02-28 | A kind of powdery lost foam casting coating and its application method and application |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710110403.5A CN106694798B (en) | 2017-02-28 | 2017-02-28 | A kind of powdery lost foam casting coating and its application method and application |
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| Publication Number | Publication Date |
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| CN106694798A CN106694798A (en) | 2017-05-24 |
| CN106694798B true CN106694798B (en) | 2019-01-04 |
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| CN201710110403.5A Expired - Fee Related CN106694798B (en) | 2017-02-28 | 2017-02-28 | A kind of powdery lost foam casting coating and its application method and application |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107866520B (en) * | 2017-11-15 | 2020-04-07 | 共享智能装备有限公司 | Anhydrous water-soluble powder casting coating and preparation method thereof |
| CN108176806B (en) * | 2017-12-25 | 2020-04-03 | 湖北工业大学 | Powdery auxiliary agent for alcohol-based casting coating and preparation and use methods thereof |
| 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 |
| CN108296428B (en) * | 2018-02-02 | 2019-12-27 | 桃江新兴管件有限责任公司 | Dry powder lost foam casting coating |
| CN108342103B (en) * | 2018-03-29 | 2020-06-26 | 福建漳平众知防火科技有限公司 | Concrete and brick wall fireproof coating, fireproof mud and preparation method thereof |
| CN110625061B (en) * | 2019-10-11 | 2020-10-02 | 柳州市顺昇机械有限公司 | Multifunctional coating for casting and preparation method thereof |
| CN112658199B (en) * | 2020-12-07 | 2022-04-08 | 安徽信息工程学院 | Environment-friendly paint for casting aluminum-silicon alloy by lost foam and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5573982A (en) * | 1994-03-05 | 1996-11-12 | Mitsubishi Chemical Basf Company Limited | Slurry composition, shaping method using the same, and fired body |
| CN1666828A (en) * | 2005-01-18 | 2005-09-14 | 湖北工业大学 | Anti-seepage burnon casting paint made from alcohol base or aqueous sand powder |
| CN101319104B (en) * | 2008-06-20 | 2010-09-08 | 中国矿业大学(北京) | Composite suspending agent of alcohol-based dry powder coating, preparation method of composite suspending agent and prepared coating |
| CN101428328B (en) * | 2008-12-06 | 2010-06-30 | 华中科技大学 | Powdery paint for lost foam casting of cast iron |
| CN102407275B (en) * | 2011-04-25 | 2013-04-10 | 湖北工业大学 | Expendable pattern casting (EPC) molding shell paint for casting steel and preparation method thereof |
| 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 |
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Granted publication date: 20190104 |