CN104624922A - Lost foam casting coating for gray cast iron and preparation method of lost foam casting coating - Google Patents
Lost foam casting coating for gray cast iron and preparation method of lost foam casting coating Download PDFInfo
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- CN104624922A CN104624922A CN201510045909.3A CN201510045909A CN104624922A CN 104624922 A CN104624922 A CN 104624922A CN 201510045909 A CN201510045909 A CN 201510045909A CN 104624922 A CN104624922 A CN 104624922A
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- lost foam
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- foam paint
- aggregate
- casting pig
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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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Abstract
The invention discloses a lost foam casting coating for gray cast iron and a preparation method of the lost foam casting coating. The lost foam casting coating comprises an aggregate, a binder, a suspending agent, a surfactant, a defoaming agent, water and a preservative, wherein recovered pill-cleaning dust is adopted as one part of the aggregate; the finally prepared coating is good in air permeability; a high-temperature gas can be rapidly and almost invariantly discharged out of a coat when a thick-walled casting is poured; carbon black and blowhole defects are reduced to the minimal extent; in addition, absence of an adhesive sand defect is also ensured; the lost foam casting coating can be mixed evenly by the preparation method disclosed by the invention; and later use is facilitated. The lost foam casting coating is suitable for preparation of the lost foam casting coating.
Description
Technical field
The invention belongs to casting field, relate to a kind of coating and preparation method thereof, be specifically related to a kind of casting pig lost foam paint and preparation method thereof.
Background technology
Lost foam casting (also known as cavityless casting) the Pao foam Mo Xing ﹙ identical with cast shape or several bondings is combined into model Cu ﹚ to brush fireproof coating and after drying, be embedded in vibration molding in drystone sand, pour into a mould under negative pressure, model is gasified, liquid metals occupies modal position, forms the novel casting method of foundry goods after solidifying cooling.
In prior art casting pig with lost foam paint mostly by silica flour, graphite powder, sodium bentonite, water soluble phenol resin, sodium carboxymethylcellulose, polyvinyl acetate emulsion, OP-10, n-octyl alcohol and water composition, its preparation method first sodium bentonite and sodium carboxymethylcellulose suitable quantity of water is soaked 24h, then successively silica flour, graphite powder, water soluble phenol resin, polyvinyl acetate emulsion and aqueous solvent add in mixer and stir 30min, again by soaked sodium bentonite and sodium carboxymethylcellulose, OP-10, n-octyl alcohol and supplementing water together add, container set aside for use is put into after stirring 60min.Foundry goods scab phenomenon is in use there is, particularly at wall thickness position by the lost foam paint obtained by above-mentioned formula and preparation method.In addition, foundry goods carbon defects position is more, especially appears at wall thickness position and cast top.
Therefore, it is significant for studying a kind of lost foam paint that can solve prior art deficiency.
Summary of the invention
The technical problem to be solved in the present invention, be to provide a kind of casting pig lost foam paint and preparation method thereof, adopt and reclaim clear ball dust as the part in aggregate, make final obtained coating permeability good, high-temperature gas can be made for thick-walled casting promptly, hardly to discharge coating when pouring into a mould variable, carbon black, gas hole defect are down to minimum, must guarantee in addition not produce scab defect.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
A kind of casting pig lost foam paint, by weight, comprises following raw material:
99 ~ 100 parts, aggregate, binding agent 1.04 ~ 1.3 parts, suspending agent 2.48 ~ 2.5 parts,
1.46 ~ 1.5 parts, surfactant, defoamer 0.009 ~ 0.1 part, anticorrisive agent 0.072 ~ 0.08 part.
Limit as one of the present invention, described aggregate by weight, comprises following raw material:
Silica flour 76 ~ 84 parts, mica powder 6 ~ 8 parts, vermiculite power 2-4 part, attapulgite 4 ~ 6 parts, reclaims 4 ~ 6 parts, clear ball dust.
Wherein, reclaiming clear ball dust is a kind of recovery coating aggregate, and main component is silica flour, is a kind of material of recoverable, through operation process such as washing, oven dry, screenings after this material reclaims, can reuse.Owing to all there occurs change through high temperature and its outward appearance of mechanism and phase transformation, microscopic observation corner angle are little, volume phase transition also tends to be steady, so it is added in coating as aggregate, consumption is few but effect is large, and its principle is that it is smooth compared with other aggregate surface, and when polystyrene high-temperature gas passes, being coated with property is little, interstitial channels is unimpeded can make a large amount of gas pass through, and relatively carbon black defect probability is just low.In addition, because its phase transformation is stablized, when being heated, between particle, displacement is very little, and it is embedded between other aggregate in addition, therefore high-temperature liquid metal does not infiltrate molding sand by dope layer, plays Sand sticking-resistant effect.
As the further restriction of above-mentioned restriction, described aggregate processing method is carried out according to following steps order:
First silica flour, mica powder, vermiculite power, attapulgite, clear ball are reclaimed dust and add successively in stirring elevator by its parts by weight, carry out three automatic liftings and stirring, the time of each automatic lifting and stirring is 10 ~ 12min, finally obtained aggregate.
Limit as another kind of the present invention, described binding agent is made up of latex powder and dextrin, and their weight ratio is 5:8.
Bonding agent uses latex powder and dextrin, and both, with the use of reaching best technique and service behaviour, if its ratio changes, can cause performance change, as crush when model dip-coating rear surface cracking or cast etc.
Limit as another kind of the present invention, described suspending agent is made up of sodium carboxymethylcellulose and sodium bentonite, and their weight ratio is 1:1.5.
Sodium carboxymethylcellulose and sodium bentonite, these two kinds of materials reach optimum state in its ratio with the use of making suspension effect.Sodium carboxymethylcellulose is at 20 ~ 45 DEG C, and cementation is risen rapidly, and this scope meets operating temperature, and namely operator adapts to 20 ~ 38 DEG C of environmental works.Sodium bentonite, except having suspension effect, also has the effect that high temperature bond is auxiliary.Above-mentioned two kinds of material compatibilities first determine ratio according to respective character, then obtain through test of many times that optimum efficiency just determines, if change the ratio of arbitrary material, or there is water on the coating top layer after stirring, or is exactly that coating is too glutinous cannot dip-coating (or brush).
Limit as another kind of the present invention, described surfactant is made up of calgon and sodium phosphate trimer, and their weight ratio is 1:2.
Sodium phosphate trimer Na wherein
5p
3o
10meet GB1034-1036-91 food grade standard, calgon and these two kinds of food rank additive materials of sodium phosphate trimer carry out theory calculate according to the ratio of lipophilic group and hydrophilic group and acid-base value.The interference of other factors is subject in actual mechanical process, through test of many times adjustment, the ratio number finally determined.If both ratios change and just there will be obtained coating and be not in use coated with, or occur that coating trickles too many phenomenon.
Limit as another kind of the present invention, described defoamer is organosilicon.
Limit as another kind of the present invention, described anticorrisive agent is made up of zinc oxide and Sodium Benzoate, and their weight ratio is 1:3.
Present invention also offers the preparation method of above-mentioned lost foam paint, it carries out according to following steps order:
(1) aggregate be placed in stir elevator, after anticorrisive agent and surfactant added mixer center by its parts by weight stir 10min;
(2) suspending agent and binding agent are added stirring elevator weight successively by its parts by weight, through triple mixing and lifting operation, the time of each automatic lifting and stirring is 8 ~ 10min, fully by even for the mixing of materials adding mixer, and finally obtained lost foam paint.
In use, join in mould wash mixer by lost foam paint and water according to the ratio that weight ratio is 1: 0.75 ~ 0.9, mixing time is 60 ~ 90min, can directly use.
Owing to have employed above-mentioned technical scheme, compared with prior art, acquired technological progress is in the present invention:
Clear for recovery ball dust interpolation is done aggregate by the present invention, make it in preparation process, all there occurs change through high temperature and mechanism outward appearance and phase transformation, microscopic observation corner angle are little, volume phase transition also tends to be steady, and adds in coating using it as aggregate, and consumption is few but effect is large, its principle is that it is smooth compared with other aggregate surface, when polystyrene high-temperature gas passes, being coated with property is little, and interstitial channels is unimpeded can make a large amount of gas pass through, and relatively carbon black defect probability is just low.In addition, because its phase transformation is stablized, when being heated, between particle, displacement is very little, and it is embedded between other aggregate in addition, therefore high-temperature liquid metal does not infiltrate molding sand by dope layer, plays Sand sticking-resistant effect.
Casting pig lost foam paint provided by the present invention is water based paint, compared with the alcohol-base paint used in prior art environmental protection more, and cost reduces, alcohol-base paint auxiliary material major part used is organic matter, single with regard to organobentonite, its price is 12 ~ 15 times of inorganic common bentonite price, and limited source; In addition, organic matter increases and brings many problems to cast undoubtedly, such as choke fire, bleb, drip knurl etc., coating after stirring in addition must be finished in a short time, so higher to the competency profiling of model immersion-coating operation work, virtually add the cost of human resources and limit the scope of selecting work.Water based paint just increases baking operation by contrast, and operating cost is can hold the 100M of 15 tons of cast models
3drying chamber is example, per day power consumption 120 degree, electric average price 1.1 yuan/degree, and day dries cost 132 yuan, and can complete for 3 times, foundry goods per ton on average dries cost 26.4 yuan.Here just winter calculates by drying completely, meets spring, summer, three seasons of autumn, air-dry after model dip-coating, and just dry once after assembling, its cost is original 1/3rd, namely about 9 yuan again.Average of the whole year day dries cost 12.3 yuan, and the use cost of organic alcohol solvent in alcohol-base paint is just far above the present invention, and Integrated comparative cost of the present invention comparatively alcohol-base paint has and significantly reduces.
Casting pig lost foam paint obtained by the present invention when pouring into a mould to thick-walled casting, can make high-temperature gas promptly, hardly discharge coating variable, be down to minimum, also stopped the generation of scab defect in addition by carbon black, gas hole defect.
The present invention is applicable to the preparation of casting pig lost foam paint.
The present invention is described in further detail below in conjunction with specific embodiment.
Detailed description of the invention
embodiment 1 one kinds of casting pig lost foam paints and preparation method thereof
A kind of casting pig lost foam paint, it comprises following raw material:
Silica flour 84 kg, mica powder 6 kg, vermiculite power 2 kg, attapulgite 4 kg,
Reclaim clear ball dust 4 kg, latex powder 0.5 kg, dextrin 0.8 kg,
Sodium carboxymethylcellulose 1.0 kg, sodium bentonite 1.5 kg, calgon 0.5 kg,
Sodium phosphate trimer 1.0 kg, organosilicon 0.1 kg, zinc oxide 0.02 kg, Sodium Benzoate 0.06 kg.
Its preparation method carries out according to following steps order:
(1) aggregate processing: first silica flour, mica powder, vermiculite power, attapulgite, clear ball are reclaimed dust and add successively in stirring elevator, carry out three automatic liftings and stirring, the time of each automatic lifting and stirring is 12min, finally obtained aggregate.
(2) by stagnant for aggregate in stirring elevator, after zinc oxide, Sodium Benzoate, calgon, sodium phosphate trimer are added mixer center and stir 10min;
(3) sodium carboxymethylcellulose, sodium bentonite, latex powder, dextrin are added in stirring elevator successively, through triple mixing and lifting operation, the time of each automatic lifting and stirring is 8min, fully by even for the mixing of materials adding mixer.
In use, join in mould wash mixer by casting pig lost foam paint and water according to the ratio that weight ratio is 1: 0.8, mixing time is 60min, can directly use.Obtained casting pig lost foam paint when pouring into a mould to thick-walled casting, can make high-temperature gas promptly, hardly discharge coating variable, be down to minimum, also ensure the defect not producing scab in addition by carbon black, gas hole defect.
embodiment 2-6 casting pig lost foam paint and preparation method thereof
Embodiment 2-6 is respectively a kind of casting pig lost foam paint and preparation method thereof, similar to preparation method to the raw material of embodiment 1, and difference is only that preparation parameter involved in the consumption of raw material and preparation method is different, shown in table specific as follows:
In table 1 embodiment 2-6, the raw material of aggregate forms and technical parameter involved in preparation method
Preparation parameter involved in the consumption of table 2 embodiment 2-6 Raw and preparation method
Casting pig lost foam paint obtained by embodiment 2-6 when pouring into a mould to thick-walled casting, can make high-temperature gas promptly, hardly discharge coating variable, be down to minimum, also ensure the defect not producing scab in addition by carbon black, gas hole defect.
The above is only preferred embodiment of the present invention, is not restriction the present invention being made to other form, and any those skilled in the art may utilize above-mentioned technology contents to be changed or be modified as the Equivalent embodiments of equivalent variations as enlightenment.But everyly do not depart from technical solution of the present invention content, according to technical spirit of the present invention to the simple modification done by above embodiment, equivalent variations and remodeling, still belong to the protection domain of the claims in the present invention.
Claims (9)
1. a casting pig lost foam paint,
it is characterized in thatit comprises following raw material by weight:
99 ~ 100 parts, aggregate, binding agent 1.04 ~ 1.3 parts, suspending agent 2.48 ~ 2.5 parts,
1.46 ~ 1.5 parts, surfactant, defoamer 0.009 ~ 0.1 part, anticorrisive agent 0.072 part ~ 0.08 part.
2. casting pig lost foam paint according to claim 1,
it is characterized in that:described aggregate by weight, comprises following raw material:
Silica flour 76 ~ 84 parts, mica powder 6 ~ 8 parts, vermiculite power 2-4 part,
Attapulgite 4 ~ 6 parts, reclaims 4 ~ 6 parts, clear ball dust.
3. casting pig lost foam paint according to claim 2, is characterized in that: described aggregate processing method is carried out according to following steps order:
First silica flour, mica powder, vermiculite power, attapulgite, clear ball are reclaimed dust and add successively in stirring elevator by its parts by weight, carry out three automatic liftings and stirring, the time of each automatic lifting and stirring is 10 ~ 12min, finally obtained aggregate.
4. casting pig lost foam paint according to claim 1,
it is characterized in that:described binding agent is made up of latex powder and dextrin, and their weight ratio is 5:8.
5. casting pig lost foam paint according to claim 1,
it is characterized in that:described suspending agent is made up of sodium carboxymethylcellulose and sodium bentonite, and their weight ratio is 1:1.5.
6. casting pig lost foam paint according to claim 1,
it is characterized in that:described surfactant is made up of calgon and sodium phosphate trimer, and their weight ratio is 1:2.
7. casting pig lost foam paint according to claim 1,
it is characterized in that:described defoamer is organosilicon.
8. casting pig lost foam paint according to claim 1,
it is characterized in that:described anticorrisive agent is made up of zinc oxide and Sodium Benzoate, and their weight ratio is 1:3.
9. a preparation method for the casting pig lost foam paint according to any one of claim 1 ~ 8,
it is characterized in thatit carries out according to following steps order:
(1), after aggregate being placed in stirring elevator, defoamer, anticorrisive agent and surfactant being added mixer center and stir 10min;
(2) suspending agent and binding agent are added in stirring elevator successively, through triple mixing and lifting operation, the time of each automatic lifting and stirring is 8 ~ 10min, and the mixing of materials that will add mixer is fully even, finally obtained lost foam paint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510045909.3A CN104624922A (en) | 2015-01-29 | 2015-01-29 | Lost foam casting coating for gray cast iron and preparation method of lost foam casting coating |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510045909.3A CN104624922A (en) | 2015-01-29 | 2015-01-29 | Lost foam casting coating for gray cast iron and preparation method of lost foam casting coating |
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| CN104624922A true CN104624922A (en) | 2015-05-20 |
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| CN201510045909.3A Pending CN104624922A (en) | 2015-01-29 | 2015-01-29 | Lost foam casting coating for gray cast iron and preparation method of lost foam casting coating |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105170883A (en) * | 2015-07-30 | 2015-12-23 | 张燕 | Corundum residue-aluminum profile factory industrial sludge lost foam casting coating and preparing method thereof |
| CN105562588A (en) * | 2016-01-19 | 2016-05-11 | 安徽涌畅铸件有限公司 | Full mold binding agent and preparation method thereof |
| CN105817570A (en) * | 2016-05-27 | 2016-08-03 | 马鞍山市兴隆铸造有限公司 | Modified quartz-based mica powder full mold paint easy to smear and preparation method thereof |
| CN108213326A (en) * | 2017-12-16 | 2018-06-29 | 宁波市文旭铸造材料有限公司 | A kind of cast paint and preparation method thereof |
| CN109095935A (en) * | 2018-10-08 | 2018-12-28 | 东光县沧狮铸造材料有限公司 | A kind of dedicated lost foam paint of lost foam casting process and its manufacture craft |
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| CN102248120A (en) * | 2011-04-11 | 2011-11-23 | 中方阀业淅川制造有限公司 | Low thermoconductive paint for casting lost foam of thin wall cast |
| CN102371340A (en) * | 2011-10-10 | 2012-03-14 | 辛培兴 | Lost foam casting method for large casting |
| CN102836961A (en) * | 2012-10-09 | 2012-12-26 | 嘉禾巨人机床有限公司 | Lost foam coating for large casting and preparation method of lost foam coating |
| CN103447454A (en) * | 2013-08-26 | 2013-12-18 | 宁夏共享集团有限责任公司 | Water-based paint of lost foam for iron casting, and production method of water-based paint |
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2015
- 2015-01-29 CN CN201510045909.3A patent/CN104624922A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102248120A (en) * | 2011-04-11 | 2011-11-23 | 中方阀业淅川制造有限公司 | Low thermoconductive paint for casting lost foam of thin wall cast |
| CN102371340A (en) * | 2011-10-10 | 2012-03-14 | 辛培兴 | Lost foam casting method for large casting |
| CN102836961A (en) * | 2012-10-09 | 2012-12-26 | 嘉禾巨人机床有限公司 | Lost foam coating for large casting and preparation method of lost foam coating |
| CN103447454A (en) * | 2013-08-26 | 2013-12-18 | 宁夏共享集团有限责任公司 | Water-based paint of lost foam for iron casting, and production method of water-based paint |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105170883A (en) * | 2015-07-30 | 2015-12-23 | 张燕 | Corundum residue-aluminum profile factory industrial sludge lost foam casting coating and preparing method thereof |
| CN105562588A (en) * | 2016-01-19 | 2016-05-11 | 安徽涌畅铸件有限公司 | Full mold binding agent and preparation method thereof |
| CN105817570A (en) * | 2016-05-27 | 2016-08-03 | 马鞍山市兴隆铸造有限公司 | Modified quartz-based mica powder full mold paint easy to smear and preparation method thereof |
| CN108213326A (en) * | 2017-12-16 | 2018-06-29 | 宁波市文旭铸造材料有限公司 | A kind of cast paint and preparation method thereof |
| CN109095935A (en) * | 2018-10-08 | 2018-12-28 | 东光县沧狮铸造材料有限公司 | A kind of dedicated lost foam paint of lost foam casting process and its manufacture craft |
| CN113648878A (en) * | 2018-10-08 | 2021-11-16 | 东光县沧狮铸造材料有限公司 | Lost foam coating, manufacturing method thereof and stirring device |
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Application publication date: 20150520 |
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