CN106216595A - A kind of coating for lost foam casting - Google Patents
A kind of coating for lost foam casting Download PDFInfo
- Publication number
- CN106216595A CN106216595A CN201610753792.9A CN201610753792A CN106216595A CN 106216595 A CN106216595 A CN 106216595A CN 201610753792 A CN201610753792 A CN 201610753792A CN 106216595 A CN106216595 A CN 106216595A
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- China
- Prior art keywords
- parts
- coating
- lost foam
- foam casting
- coated
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
Abstract
The invention discloses a kind of coating for lost foam casting, including the component of following weight part ratio: bauxite 55 65 parts, silica flour 25 35 parts, plant gum powder 1.0 1.5 parts, CMC 0.3 0.6 parts, yellow starch gum 0.4 0.8 parts, organobentonite 1.2 1.6 parts, the wood fiber 0.3 0.7 parts, polyurethane resin 1.2 1.7 parts, phenol-formaldehyde resin modified 1.5 2.5 parts, wollastonite 3.0 4.0 parts.The coating wetting speed that the present invention provides is fast, significantly reduce surface tension, can be coated with well and be attached to be stained with on the plastic adhesive tape of Bai Mo, it is coated with uniformly and does not shows money or valuables one carries unintentionally, after being coated with, the levelability of coating is preferable, significantly eliminate the later stage repair procedure of workman in actual production operation, improve production efficiency, and the coating that provides of the present invention also has good suspension, thixotropy, hot permeability, room temperature and high temperature mechanical strength and the not combination property such as cracking, has wide prospect of the application in lost foam casting.
Description
Technical field
The present invention relates to lost foam casting process field, a kind of coating for lost foam casting.
Background technology
Lost foam casting (also known as cavityless casting) is to make of foam plastics (EPS, STMMA or EPMMA) macromolecular material
Become and the design of part of casting to be produced, size duplicate full mold mould, through being coated with coating, drying, be embedded in drystone English
Through three-dimensional vibrating moulding in sand, casting molding flask pours into molten metal liquid under negative pressure state, makes macromolecular material model
By thermal evaporation extraction, and then produced foundry goods by the disposal molding New Casting Technique formed after liquid metals replacement cooled and solidified
Novel casting technology.In recent years, the prominent advantage such as lost foam casting is higher with its casting dimension accuracy, pollute less, low cost,
Development continuously and healthily is obtained at casting field.
In lost foam casting process, coating be lost foam casting success for one of the key factor produced,
It is to ensure that surface quality of continuous castings and prevents the key technology of various defect.Different from common sand cast paint, disappear
Die cast coating is not to be coated on casting mold die cavity, but is coated on foamed polystyrene pattern.When foamed polystyrene pattern is by liquid
During state metal replacement, what coating actually played is casting mold effect, thus has saying of " coating being i.e. casting mold ".Therefore, performance is excellent
Different coating be developed into those skilled in the art study hotspot of row.As disclosed in CN 101767184 B, a kind of anti-blocking lacks
Lost foam casting cast iron coating fallen into and preparation method thereof, the formula of this coating is: bauxite, Kaolin, Pulvis Talci, attapulgite
Soil, sodium lignin sulfonate, aluminum sulfate, polyvinyl alcohol, Ludox, brown iron oxide, n-octyl alcohol；This coating mainly solve carbon defects,
Prevent the problem that cast(ing) surface is coarse, wrinkling.And for example CN 104275435 B discloses a kind of high accuracy lost foam cast steel coating,
This steel moulder's paint is made up of refractory aggregate, auxiliary agent, Ludox, water；Wherein refractory aggregate is that aluminum silica flour, silica flour, bauxite are ripe
The combination of one or more in material, this coating mainly solves that coating elevated temperature strength is low, fissility is poor, dried intensity is low, easy
The problem of cracking.For another example CN 103447454 B discloses a kind of cast iron evaporative pattern water based paint, this coating by alumine,
Mound powder, Brown Alundum, sodium bentonite, polyacrylamide, polyvinyl acetate emulsion, maltodextrin, Ludox, hexa metaphosphoric acid
Sodium, tributyl phosphate, penta sodium pentachlorophenate, OP-10 activating agent and water；This coating mainly solves that baked strength is low, coating fragility big,
The problem that coating permeability is poor, cast(ing) surface carbon defects is serious.These technology solve existing coating the most to varying degrees
Present in carbon defects, non-refractory, intensity is low and easy problems of crack.But, the most a lot of dispellable mould castings
In actual use, the adhesiveness that there is coating the most to some extent is poor for coating, and this directly affects the coating painting at Bai Moshang
Extension property and adhesive force, especially in the middle of pipe fitting produces, owing to the white mould of large-size pipe or bend pipe is usually by two parts or more
Many parts rely on cold and hot glue to be bonded as one, but owing to the most increasing Producer feels to use cold glue heat bonding too
Waste time and energy, so major part producer directly selects use transparent adhesive tape and brings bonding, and this stick the white mould having adhesive tape
Just adhesive force and being coated with property to coating are had higher requirement, and bring the biggest also to the field technician of actual film
Technology obstructs.According to our investigation, up to the present, the coating in industry also cannot meet on adhesive tape
It is coated with and adheres to, being often coated with the Bai Moshi being stained with adhesive tape, it may appear that coating is coated with the place of adhesive tape of losing control of one's feelings, dew
Going out Bai Mo, there is coating simultaneously and be coated with Bai Mohou, its levelability is poor.Technology people in order to solve this problem, in industry
Member attempts the ratio by changing binder in coating or the stronger auxiliary agent of being coated with property of interpolation solves this problem, but thing
In reality, although the coating obtained by adding binder and the ratio adjusting binder can have a little improvement to its adhesiveness,
But still have the white mould of part not to be completely covered, and find that other performances of the coating after adjusting have the trend of deterioration, such as high temperature
Air penetrability, high temperature surface strength, thixotroping rate and high temperature cracking resistance all can be influenced to different extents, directly affect final casting
Quality.
Summary of the invention
It is an object of the invention to provide a kind of coating for lost foam casting, with solve existing coating coating be stained with
Adhesive force and being coated with property is poor and levelability is poor problem is there is during the white mould of gelatin band.
It is an object of the invention to be achieved through the following technical solutions: a kind of coating for lost foam casting, including with
The component of lower weight part ratio:
Bauxite 55-65 part, silica flour 25-35 part, plant gum powder 1.0-1.5 part, CMC 0.3-0.6 part, yellow starch gum 0.4-0.8
Part, organobentonite 1.2-1.6 part, wood fiber 0.3-0.7 part, polyurethane resin 1.2-1.7 part, phenol-formaldehyde resin modified 1.5-
2.5 parts, wollastonite 3.0-4.0 part.
Preferably, described coating includes the component of following weight part ratio: bauxite 59-62 part, silica flour 28-32 part, plant
Thing rubber powder 1.1-1.3 part, CMC 0.3-0.5 part, yellow starch gum 0.5-0.7 part, organobentonite 1.3-1.5 part, wood fiber 0.4-
0.6 part, polyurethane resin 1.4-1.6 part, phenol-formaldehyde resin modified 1.8-2.2 part, wollastonite 3.2-3.6 part.
It is highly preferred that described coating includes the component of following weight part ratio: bauxite 60 parts, silica flour 30 parts, plant gum
1.2 parts of powder, CMC 0.4 part, yellow starch gum 0.6 part, organobentonite 1.4 parts, the wood fiber 0.5 part, polyurethane resin 1.5 parts, change
Property 2.0 parts of phenolic resin, wollastonite 3.4 parts.
Described plant gum powder is corn starch, potato starch or tapioca.
Described phenol-formaldehyde resin modified is polyurethane modified phenol formaldehyde resin.
Described wollastonite is fibrous wollastonite.
The using method of the coating that the present invention provides is: mixed for 1kg:0.6kg in mass ratio with water by described coating,
The dispersion machine high speed of 2000 revs/min stirs 1 hour, after standing 15 minutes can the white mould of brushing polystyrene, one will be brushed
Time white mould put into the baking room of 50 DEG C and dry 8-12 hour, brush the drying more than 12 hours of two times.
The present invention, by have selected major ingredient and specific small powder, especially have selected polyurethane resin in small powder, modified phenol
Urea formaldehyde and wollastonite and major ingredient and the proportioning of other small powders so that the wetting speed of the coating compound finally given is special
Hurry up, greatly reduce interfacial tension, it is possible to be coated with well and be attached to be stained with on the plastic adhesive tape of Bai Mo, be coated with uniformly and not
Showing money or valuables one carries unintentionally, the coating being coated on Bai Moshang can form chemical bond with white mould generation chemical reaction, can be obviously improved after cross-linking
Bonding dynamics, and the good leveling property of its coating after being coated with, greatly eliminating later stage of workman in actual production operation repaiies
Mend operation, improve production efficiency, and the coating that provides of the present invention not only improve coating be coated with performance and flow leveling,
The more important thing is that it has good suspension, thixotropy, hot permeability, room temperature and high temperature mechanical strength and not cracking etc.
Combination property, has wide prospect of the application in lost foam casting.
Accompanying drawing explanation
Fig. 1 is that the coating of the embodiment of the present invention 1 preparation is coated with state diagram at the extension sticking the Bai Moshang having adhesive tape.
Fig. 2 is that the coating of comparative example 1 of the present invention preparation is coated with state diagram at the extension sticking the Bai Moshang having adhesive tape.
Detailed description of the invention
Example below is used for further describing the present invention, but limits the present invention the most in any form.
Embodiment 1
Bauxite 6.0kg, silica flour 3.0kg, corn starch 120g, CMC 40g, yellow starch gum 60g, organobentonite 140g, wood
Fiber 50g, polyurethane resin 150g, polyurethane modified phenol formaldehyde resin 200g, fibrous wollastonite 340g.
Embodiment 2
Bauxite 5.9kg, silica flour 2.8kg, potato starch 110g, CMC 50g, yellow starch gum 50g, organobentonite 130g,
Wood fiber 60g, polyurethane resin 160g, polyurethane modified phenol formaldehyde resin 180g, fibrous wollastonite 360g.
Embodiment 3
Bauxite 6.2kg, silica flour 3.2kg, corn starch 130g, CMC 30g, yellow starch gum 70g, organobentonite 160g, wood
Fiber 40g, polyurethane resin 140g, polyurethane modified phenol formaldehyde resin 220g, fibrous wollastonite 320g.
Embodiment 4
Bauxite 5.5kg, silica flour 3.0kg, tapioca 110g, CMC 40g, yellow starch gum 65g, organobentonite 140g, wood
Fiber 70g, polyurethane resin 150g, polyurethane modified phenol formaldehyde resin 210g, fibrous wollastonite 330g.
Embodiment 5
Bauxite 5.8kg, silica flour 2.5kg, corn starch 100g, CMC 30g, yellow starch gum 40g, organobentonite 155g, wood
Fiber 30g, polyurethane resin 170g, polyurethane modified phenol formaldehyde resin 250g, fibrous wollastonite 300g.
Embodiment 6
Bauxite 6.5kg, silica flour 3.5kg, potato starch 150g, CMC 60g, yellow starch gum 80g, organobentonite 120g,
Wood fiber 65g, polyurethane resin 120g, polyurethane modified phenol formaldehyde resin 150g, fibrous wollastonite 400g.
Comparative example 1
Bauxite 6kg, silica flour 3.5kg, corn starch 200g, CMC 20g, yellow starch gum 60g, organobentonite 120g, wood are fine
Dimension 100g.
Comparative example 2
Bauxite 6kg, silica flour 3kg, corn starch 120g, CMC 40g, yellow starch gum 60g, organobentonite 140g, the wood fiber
50g, polyurethane resin 150g, polyurethane modified phenol formaldehyde resin 200g.
The performance detection of the coating that embodiment 7 present invention provides with comparative example
Testing index and detection method:
1, adhesiveness: each component of coating embodiment of the present invention 1-4 and comparative example 1-2 provided weighs the most in proportion and mixes
Close, be 1Kg:0.6Kg by material-water ratio, after stirring, give be stained with adhesive tape white die coating hang coating, its result see Fig. 1 and
Fig. 2, Fig. 1 are the outward appearance that the embodiment of the present invention 1 coating is coated with the Bai Mohou being stained with adhesive tape, and Fig. 2 is that comparative example 1 coating is coated with
It is stained with the outward appearance of the Bai Mohou of adhesive tape.
2, levelability: weigh the coating that 100g is blended and be poured on and draw on graduated glass plate, measure the remote of coating trickling
Closely, the scale on record glass plate, trickling the farthest illustrates that the levelability of coating is the best.
3, suspensibility/%: the coating prepared is poured in 100ml band grinding port plug graduated cylinder so that it is reach at 100ml absolute altitude,
Stand 24 hours, measure clear layer volume v, according to c=(100-v/100) * 100 read suspensibility.
4, high temperature venting rate: the coating prepared is coated on survey grid, puts into after drying in 1300 degrees Celsius of Muffle furnaces and protect
Temperature 10 minutes, is fixed on sample cylinder sealing after being down to room temperature, measure with sand permeability instrument.
5, high temperature surface strength/MP: utilize quantification of intensities determinator, makes diameter 45-50mm, thickness 2-by coating
The sample of 3mm, puts in the Muffle furnace of 1300 degrees Celsius and is incubated 10 minutes.Its gas that can bear will be measured in sample embedding device
Body pressure.
6, thixotroping rate/%: with NXS-11 type rotary viscosity measuring paint thixotropy.
7, density g/cm3: the coating prepared is poured in graduated cylinder, inserts Baume hydrometer, reading.
8, high temperature cracking resistance grade: by the uniform dip-coating of coating for preparing on water-glass sand sample, coating layer thickness 0.5-
1mm, puts in the Muffle furnace of 1300 degrees Celsius after drying, be incubated 10 minutes, at high temperature observe coating whether crack with
And crackle degree.
Testing result:
The performance detection of the coating that table 1 present invention and comparative example provide
By the testing result of above index it can be seen that the coating that the present invention provides can be attached on well and be stained with transparent adhesive tape
The Bai Moshang of band, can reach do not show money or valuables one carries unintentionally (comparative example 1 then can not be coated with on the adhesive tape of white mould), its good leveling property,
And the combination properties such as its high temperature venting rate, surface strength and cracking resistance are the best.Additionally, from embodiment 1 and the property of comparative example 2
From the point of view of energy achievement data, containing polyurethane resin and phenol-formaldehyde resin modified in coating, and without wollastonite, its coating possesses
Excellent high temperature surface strength, but have impact on suspension and the splitting resistance of coating the most to a certain extent, it is seen then that specific little
Select and the interpolation of material play vital effect to the combination property of final coating.
Above-described embodiment is the present invention preferably embodiment, but embodiments of the present invention are not by described embodiment
Limit, the change made under other any spirit without departing from the present invention and principle, modify, substitute, combine, simplify,
All should be the substitute mode of equivalence, within being included in protection scope of the present invention.
Claims (6)
1. the coating for lost foam casting, it is characterised in that include the component of following weight part ratio:
Bauxite 55-65 part, silica flour 25-35 part, plant gum powder 1.0-1.5 part, CMC 0.3-0.6 part, yellow starch gum 0.4-0.8
Part, organobentonite 1.2-1.6 part, wood fiber 0.3-0.7 part, polyurethane resin 1.2-1.7 part, phenol-formaldehyde resin modified 1.5-
2.5 parts, wollastonite 3.0-4.0 part.
Coating for lost foam casting the most according to claim 1, it is characterised in that include the group of following weight part ratio
Point: bauxite 59-62 part, silica flour 28-32 part, plant gum powder 1.1-1.3 part, CMC 0.3-0.5 part, yellow starch gum 0.5-0.7
Part, organobentonite 1.3-1.5 part, wood fiber 0.4-0.6 part, polyurethane resin 1.4-1.6 part, phenol-formaldehyde resin modified 1.8-
2.2 parts, wollastonite 3.2-3.6 part.
Coating for lost foam casting the most according to claim 2, it is characterised in that include the group of following weight part ratio
Point: bauxite 60 parts, silica flour 30 parts, plant gum powder 1.2 parts, CMC 0.4 part, yellow starch gum 0.6 part, organobentonite 1.4 parts,
The wood fiber 0.5 part, polyurethane resin 1.5 parts, phenol-formaldehyde resin modified 2.0 parts, wollastonite 3.4 parts.
4. according to the coating for lost foam casting described in claim 1,2 or 3, it is characterised in that described plant gum powder is
In corn starch, potato starch or tapioca any one.
5. according to the coating for lost foam casting described in claim 1,2 or 3, it is characterised in that described modified phenolic resin
Fat is polyurethane modified phenol formaldehyde resin.
Coating for lost foam casting the most according to claim 4, it is characterised in that described wollastonite is threadiness silicon
Lime stone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610753792.9A CN106216595A (en) | 2016-08-30 | 2016-08-30 | A kind of coating for lost foam casting |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610753792.9A CN106216595A (en) | 2016-08-30 | 2016-08-30 | A kind of coating for lost foam casting |
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| CN201610753792.9A Pending CN106216595A (en) | 2016-08-30 | 2016-08-30 | A kind of coating for lost foam casting |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106825389A (en) * | 2016-12-19 | 2017-06-13 | 重庆市九明机械制造有限公司 | Lost foam casting coating |
| CN107096874A (en) * | 2017-05-03 | 2017-08-29 | 西安工程大学 | A kind of highly-breathable alcohol radical lost foam paint and preparation method thereof |
| CN107442741A (en) * | 2017-08-21 | 2017-12-08 | 马鞍山市三川机械制造有限公司 | A kind of preparation method of high-quality cast paint |
| CN107511449A (en) * | 2017-09-01 | 2017-12-26 | 东风精密铸造安徽有限公司 | A kind of casting sand type coating |
| CN107737868A (en) * | 2017-11-08 | 2018-02-27 | 湖北工程职业学院 | A kind of water base lost foam paint of high intensity and preparation method thereof |
| CN108311637A (en) * | 2017-01-17 | 2018-07-24 | 郭玉盼 | A kind of strong shell casting technique |
| CN108788001A (en) * | 2018-08-27 | 2018-11-13 | 河北冀凯铸业有限公司 | A kind of large size alloy cast steel part evaporative pattern water based paint |
| CN110038998A (en) * | 2019-05-15 | 2019-07-23 | 扬州双集机械有限公司 | A kind of disappearance die manufacturing process |
| CN110681818A (en) * | 2019-11-08 | 2020-01-14 | 枣庄市亿滕机械制造有限公司 | Cast iron coating for lost foam and preparation method thereof |
| CN112676536A (en) * | 2020-12-17 | 2021-04-20 | 平遥同妙机车有限公司 | Lost foam ceramic cavity shell type casting and casting method thereof |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106825389A (en) * | 2016-12-19 | 2017-06-13 | 重庆市九明机械制造有限公司 | Lost foam casting coating |
| CN108311637A (en) * | 2017-01-17 | 2018-07-24 | 郭玉盼 | A kind of strong shell casting technique |
| CN107096874A (en) * | 2017-05-03 | 2017-08-29 | 西安工程大学 | A kind of highly-breathable alcohol radical lost foam paint and preparation method thereof |
| CN107096874B (en) * | 2017-05-03 | 2019-06-21 | 西安工程大学 | A kind of highly-breathable alcohol radical lost foam paint and preparation method thereof |
| CN107442741A (en) * | 2017-08-21 | 2017-12-08 | 马鞍山市三川机械制造有限公司 | A kind of preparation method of high-quality cast paint |
| CN107511449A (en) * | 2017-09-01 | 2017-12-26 | 东风精密铸造安徽有限公司 | A kind of casting sand type coating |
| CN107737868A (en) * | 2017-11-08 | 2018-02-27 | 湖北工程职业学院 | A kind of water base lost foam paint of high intensity and preparation method thereof |
| CN108788001A (en) * | 2018-08-27 | 2018-11-13 | 河北冀凯铸业有限公司 | A kind of large size alloy cast steel part evaporative pattern water based paint |
| CN110038998A (en) * | 2019-05-15 | 2019-07-23 | 扬州双集机械有限公司 | A kind of disappearance die manufacturing process |
| CN110681818A (en) * | 2019-11-08 | 2020-01-14 | 枣庄市亿滕机械制造有限公司 | Cast iron coating for lost foam and preparation method thereof |
| CN112676536A (en) * | 2020-12-17 | 2021-04-20 | 平遥同妙机车有限公司 | Lost foam ceramic cavity shell type casting and casting method thereof |
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Application publication date: 20161214 |