CN102139342B - High-permeability sand-burning-preventing paint for casting and preparation method thereof - Google Patents
High-permeability sand-burning-preventing paint for casting and preparation method thereof Download PDFInfo
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- CN102139342B CN102139342B CN2011100536265A CN201110053626A CN102139342B CN 102139342 B CN102139342 B CN 102139342B CN 2011100536265 A CN2011100536265 A CN 2011100536265A CN 201110053626 A CN201110053626 A CN 201110053626A CN 102139342 B CN102139342 B CN 102139342B
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Abstract
The invention discloses high-permeability sand-burning-preventing paint for casting and a preparation method thereof. The high-permeability sand-burning-preventing paint is prepared from the following raw materials: refractory aggregate, a binding agent, an activating agent, a thickening agent, a suspending agent, a defoaming agent and a carrier, wherein the masses of the binding agent, the activating agent, the thickening agent, the suspending agent, the defoaming agent and the carrier respectively account for 0.5-2.5 percent, 0.01-0.05 percent, 0.1-0.5 percent, 1.5-5.0 percent, 0.01-0.1 percent and 40-220 percent of the mass of the refractory aggregate; the refractory aggregate is a mixture of one or two of zircon powder and chromite fines in any proportion; the binding agent is phenolic resin or a mixture of the phenolic resin and one or more than two of oxidized rosin and ethyl silicate; the activating agent is alkylphenol ethoxylates; the carrier is ethanol; the thickening agent is polyvinyl butyral; the suspending agent is lithium bentonite; and the defoaming agent is normal butanol.
Description
Technical field
The present invention relates to a kind of coating and preparation method thereof, particularly a kind of high-permeability sand-burning-preventing paint of casting use and preparation method thereof.
Background technology
Cast paint is of a great variety, substantially can be divided into two classes: water based paint and organic solvent coating.Wherein organic solvent coating is namely curable by lighting in coating, with various self-hardening sand technique, be used in conjunction with, can not need oven dry, production cycle can be shortened, simplify technique, save the energy, reduce the drying plant investment, be to be cast a kind of quick drying paint that boundary widely uses, be widely used in the production of steel, iron, coloured foundry goods.But large-scale, particularly in the production application of heavy section steel castings, make slow progress, this is that casting solidification is slow because the heavy section steel castings pouring temperature is high, and temperature retention time is long; And OOS coating permeability is poor, and coating high-temp intensity, the hot cracking resistance that exposes to the sun are low, and gas forming amount is larger, can't meet the severe working condition of heavy section steel castings, so that foundry goods is prone to the defects such as large tracts of land scab, burning into sand, pore.
Chinese patent application (application number is 03128100.1) discloses a kind of alcohol radical and water base serial chromite sand powder penetration-prevention cast paint, it is characterized in that preparing the sand mold cast paint with chromite sand, its composition quality percentage is: granularity is coarser than 280 order chromite sands 10～100%, all kinds of auxiliary refractory powders of 280～325 order can be respectively 0～90%, binding agent 1.0～3.0%, suspending agent 1.5～6.0%, thickener 0.15～0.5%, carrier can be water or ethanol, methyl alcohol or isopropyl alcohol etc.Facts have proved that coating that this patent application obtains is lower and elevated temperature strength coating is inadequate to the penetration of sand mold, coating easily precipitates caking, and is not easy to store, more can't infiltrate casting mold, core space, prevents foundry goods scab; The less stable of coating under heavy section steel castings long term high temperature environment, coating is easy to crack, come off, and molten steel is easily broken through coating and is infiltered sand mold.
Chinese patent application (application number is 200910046096.4) discloses a kind of Zircon powder alcohol group dope for heavy castings, and refractory aggregate adopts and contains ZrO
265% above zirconium English powder, paint adhesion agent adopt vinsol resin and novolac resin to match, and its part by weight that accounts for coating is respectively: vinsol resin 0.3～0.6%, novolac resin 0.5～0.8%; Although present patent application can form fine and close film with the impact of the moisture in intercepting molding sand on dope layer on the sand mold surface, can make again bonding system on certain high-temperature gradient, keep its performance effectively and stable performance, resist the washing away of continuous high temperature of molten steel, thereby guarantee the certain quality of cast(ing) surface; But as easy scaling loss under the vinsol of binding agent and thermoplastic phenolic resins high temperature, high temperature coating intensity difference, foundry goods easily produce burning into sand; The coating that obtains of this patent application does not add other auxiliary osmotic agent in addition, so its penetration is undesirable, can not effectively fill up gap between sand grains and sand grains, prevents penetration; Carrier all adopts isopropyl alcohol, high cost in addition.
Summary of the invention
The objective of the invention is to overcome the above-mentioned deficiency of prior art and a kind of high-permeability sand-burning-preventing paint of casting use is provided, its permeability is strong, and gas forming amount is little, and humidity resistance is good, and have good elevated temperature strength and stability, can prevent effectively that molten steel from directly contacting with sand mold and causing the scab defect.
Technical scheme of the present invention is: a kind of high-permeability sand-burning-preventing paint of casting use, and it is formulated by following raw materials according: refractory aggregate, binding agent, activating agent, thickener and carrier; The quality of binding agent is 2.0%～2.5% of refractory aggregate quality; The quality of activating agent is 0.01%～0.05% of refractory aggregate quality; The quality of carrier is 40%～220% of refractory aggregate quality; Described refractory aggregate is one or both the mixture of arbitrary proportion in zirconium English powder, chromite powder; Described binding agent is the mixture of phenolic resins and vinsol, ethyl silicate, and wherein the quality of vinsol is 0.1%～0.2% of refractory aggregate quality, and the quality of ethyl silicate is 0.4%～1.0% of refractory aggregate quality; Described activating agent is APES; Thickener is polyvinyl butyral resin, and the quality of polyvinyl butyral resin is 0.1%～0.5% of refractory aggregate quality; Described carrier is ethanol.
The present invention further technical scheme is: described raw material also comprises suspending agent, and suspending agent is lithium bentonite, and the quality of lithium bentonite is 3.0%～5.0% of refractory aggregate quality.
The present invention further technical scheme is: described raw material also comprises defoamer, and defoamer is n-butanol, and the quality of n-butanol is 0.01%～0.1% of refractory aggregate quality.
The further technical scheme of the present invention is: described refractory aggregate is the zirconium English powder of equal proportion quality and the mixture of chromite powder (be in refractory aggregate zirconium English powder equate with the chromite powder quality); The quality of described phenolic resins, vinsol, ethyl silicate, APES, ethanol, polyvinyl butyral resin, lithium bentonite, n-butanol is respectively 1.5%, 0.1%, 0.4%, 0.03%, 95%, 0.2%, 5%, 0.05% of refractory aggregate quality.
The further technical scheme of the present invention is: the granularity of described refractory aggregate is 250～325 orders or 325～500 orders.
Another technical scheme of the present invention is: a kind of preparation method of casting the high-permeability sand-burning-preventing paint of use, it mainly comprises the steps:
One, take refractory aggregate, binding agent, activating agent and carrier as raw material; The quality of binding agent is 2.0%～2.5% of refractory aggregate quality; The quality of activating agent is 0.01%～0.05% of refractory aggregate quality; The quality of carrier is 40%～220% of refractory aggregate quality; Refractory aggregate is one or both the mixture of arbitrary proportion in zirconium English powder, chromite powder; Binding agent is the mixture in phenolic resins and vinsol, ethyl silicate, and wherein the quality of vinsol is 0.1%～0.2% of refractory aggregate quality, and the quality of ethyl silicate is 0.4%～1% of refractory aggregate quality; Carrier is ethanol; Activating agent is APES;
Two, produce standby middle material, with the part ethanol of obtaining, phenolic resins, vinsol are made into respectively to saturated solution;
Three, mixed coating processed
Saturated solution, ethyl silicate, activating agent APES mix and blend that part ethanol, second step are obtained 5～15 minutes, stir, and obtains batch mixing No. one time;
In a batch mixing, add gradually zirconium English powder, chromite powder, then stirred 15～30 minutes, add remaining ethanol, stir, obtain rerolling, namely make the high-permeability sand-burning-preventing paint of casting use.
Further another technical scheme of the present invention is: the raw material that takes in the first step also comprises thickener, suspending agent and defoamer; Thickener is polyvinyl butyral resin, and the quality of polyvinyl butyral resin is 0.1%～0.5% of refractory aggregate quality; Suspending agent is lithium bentonite, and the quality of lithium bentonite is 1.5%～5.0% of refractory aggregate quality; Defoamer is n-butanol, and the n-butanol quality is 0.01%～0.1% of refractory aggregate quality; Producing in standby middle material of second step also will make its abundant swelling with suitable quantity of water by lithium bentonite, obtains the lithium bentonite of swelling; With part ethanol, polyvinyl butyral resin is made into to saturated solution;
The 3rd walks the polyvinyl butyral resin solution that also adds second step to obtain when producing a batch mixing, the lithium bentonite of swelling; When producing rerolling, also to add the defoamer n-butanol.
The primary raw material explanation of using in the present invention:
Zirconium English powder: chemical formula ZrSiO
4, also claim zirconium silicate, ZrO
265%, SiO
2<33%; Other micro constitutent TiO2<0.4%, Fe2O3<0.5%, P2O5<0.5%, Al2O3<0.3%.
Chromite powder is with chromite (FeOCr
2O
3Or FeCr
2O
4) be the powder of main component, chromite is the oxide mineral of chromium and iron.
Phenolic resins, also be bakelite, claims again phenolic moulding powder, phenol and formaldehyde condensation polymer and obtain; The polycondensation product of phenols and aldehydes is commonly referred to as phenolic resins, general normal finger by phenol and formaldehyde through polycondensation reaction and synthetic resin.
Silester, serial chemical composition general formula: (C
2H
5O)
2n+2Si
nO
N-1, being generally n=1, its molecular formula is C
8H
20O
4Si or (C
2H
5O) 4Si.
Ethanol, be commonly called as alcohol.
Polyvinyl butyral resin, polyvinyl butyral, english abbreviation PVB, hot melt macromolecular compound.
Lithium bentonite, lithium bentonite is to adopt natural montmorillonite to form through the lithium carbonate modification, has both had sodium bentonite immersion hydration swelling performance, has again the organobentonite characteristic, in water and polar organic solvent such as ethanol, all can be dissolved into colloid or abundant swelling, the viscosity of coating is strengthened.
N-butanol, English name: butyl alcohol; Another name: butanols; Molecular formula: C
4H
10O; CH
3(CH
2)
3OH.
The coating that the present invention obtains compared with prior art has following features:
The coating permeability that the present invention obtains is strong, has good elevated temperature strength and stability, and gas forming amount is little, has in addition humidity resistance preferably; Its reason is except experiment inspection data (table 2), also be its mechanism: it is refractory aggregate that the present invention adopts 250～500 order zirconium English powder and chromite powder, coordinate the activating agent APES, increased substantially the permeance property of coating, impel the coating refractory aggregate can effectively infilter sand mold, fill up gap between sand grains and sand grains, stop molten steel to infiltrate and form penetration; The thickener polyvinyl butyral resin add the length of penetration that can control coating in 25 millimeter, avoid coating to penetrate deeply, cause waste; The suspending agent lithium bentonite makes the suspension stability of coating good, is easy to preserve; N-butanol can be eliminated coating brings because of APES when stirring foam, has improved stability and the brushability of coating, can also make the burning of coating more even; In the paint adhesion agent, except phenolic resins and vinsol, also added the part ethyl silicate, phenolic resins and vinsol can guarantee that coating has well being coated with property at normal temperatures; Ethyl silicate has high temperature bond performance preferably, aggregate in coating is bonded together closely, guarantee coating being coated with and strength of coating on the molding sand surface, the continuous high temperature of resisting molten steel washes away, prevent that molten steel from directly contacting with sand mold and causing the scab defect, thereby guarantee the surface quality of foundry goods; Adding of ethyl silicate can also reduce quantity of organic compounds, and the gas forming amount of coating is reduced, and reduced the bleb tendency.
The coating that the present invention obtains is especially suitable for use as the molding sand coating of heavy section steel castings, has high osmosis and elevated temperature strength.
During use, it is the coating that 325～500 purpose the present invention obtain that the front 0～0.5mm thickness of molding sand coating adopts the granularity of refractory aggregate, after coating, the granularity of 0.5～2.5mm thickness employing refractory aggregate is the coating that 250～325 purpose the present invention obtain, and result of use can be better like this.
In order to be illustrated more clearly in the present invention, enumerate following examples, but its to scope of invention without any restriction.
The specific embodiment
Embodiment 1
Take 50 kilograms, zirconium English powder, 50 kilograms of chromite powders, 1.5 kilograms, phenolic resins, 0.1 kilogram of vinsol, 0.4 kilogram of ethyl silicate, 0.03 kilogram of APES, alcohol 95 kilogram, 0.2 kilogram of polyvinyl butyral resin, 3 kilograms of lithium bentonites, 0.05 kilogram of n-butanol; Zirconium English powder and chromite powder granularity are 325～500 orders, and can buy granularity by market is 325～500 orders, also can be by becoming to grind 325～500 orders.
first lithium bentonite is made to its abundant swelling with suitable quantity of water, with part ethanol (alcohol), respectively phenolic resins, vinsol, polyvinyl butyral resin are made into to saturated solution, stand-by, during use (in order to reach best effect, remaining composition is just preparation in use preferably), by part ethanol, phenol resin solution, vinsol solution, polyvinyl butyral resin solution, ethyl silicate, the lithium bentonite of swelling, APES is poured ladle mixing into and is stirred 5～15 minutes (being preferably 10 minutes), after stirring, add gradually zirconium English powder, chromite powder, n-butanol, stir again 15～30(and be preferably 20 minutes) minute, add remaining ethanol to adjust the coating Baume degrees, at this moment the coating Baume degrees is substantially between 45～60, make the high-permeability sand-burning-preventing paint of casting use.
Embodiment 2-20
Embodiment 2-20 is except material composition and ratio and embodiment 1 to some extent difference, and its manufacture craft is with embodiment 1, and the material composition that all embodiment 1-20 adopt is as shown in table 1 below.
The test characteristic of the high-permeability sand-burning-preventing paint of the casting use that embodiment 1-20 obtains is as shown in table 2 below.
Table 1
Table 2
During use, the front 0～0.5mm thickness of molding sand coating, the coating that the present invention obtains refractory aggregate granularity used is 325～500 order zirconium English powder and chromite powders, this refractory aggregate more easily is penetrated into the hole of sand mold, improve the permeance property of coating, fill up gap between sand grains, prevent foundry goods scab; 0.5～2.5mm thickness after the molding sand coating, the coating that the present invention obtains adopts 250～325 order zirconium English powder and chromite powders, when guaranteeing that coating has higher permeability and higher-density coating, also can reduce coating chaps in dry and casting process generation, guarantee that coating stability is with intensity.
Claims (8)
1. high-permeability sand-burning-preventing paint of casting use, it is characterized in that: it is formulated by following raw materials according: refractory aggregate, binding agent, activating agent, thickener and carrier; The quality of binding agent is 2.0%～2.5% of refractory aggregate quality; The quality of activating agent is 0.01%～0.05% of refractory aggregate quality; The quality of carrier is 40%～220% of refractory aggregate quality; Described refractory aggregate is one or both the mixture of arbitrary proportion in zirconium English powder, chromite powder; Described binding agent is the mixture of phenolic resins and vinsol, ethyl silicate, and wherein the quality of vinsol is 0.1%～0.2% of refractory aggregate quality, and the quality of ethyl silicate is 0.4%～1.0% of refractory aggregate quality; Described activating agent is APES; Thickener is polyvinyl butyral resin, and the quality of polyvinyl butyral resin is 0.1%～0.5% of refractory aggregate quality; Described carrier is ethanol.
2. the high-permeability sand-burning-preventing paint of casting use according to claim 1, it is characterized in that: described raw material also comprises suspending agent, and suspending agent is lithium bentonite, and the quality of lithium bentonite is 3.0%～5.0% of refractory aggregate quality.
3. the high-permeability sand-burning-preventing paint of casting use according to claim 1 and 2, it is characterized in that: described raw material also comprises defoamer, and defoamer is n-butanol, and the quality of n-butanol is 0.01%～0.1% of refractory aggregate quality.
4. the high-permeability sand-burning-preventing paint of casting use according to claim 1, it is characterized in that: described raw material also comprises suspending agent, suspending agent is lithium bentonite; Described raw material also comprises defoamer, and defoamer is n-butanol; Described refractory aggregate is the zirconium English powder of equal proportion quality and the mixture of chromite powder; The quality of described phenolic resins, vinsol, ethyl silicate, APES, ethanol, lithium bentonite, n-butanol is respectively 1.5%, 0.1%, 0.4%, 0.03%, 95%, 5%, 0.05% of refractory aggregate quality.
5. the high-permeability sand-burning-preventing paint of casting use according to claim 1, it is characterized in that: the granularity of described refractory aggregate is 250～325 orders or 325～500 orders.
6. the high-permeability sand-burning-preventing paint of casting use according to claim 3, it is characterized in that: the granularity of described refractory aggregate is 250～325 orders or 325～500 orders.
7. preparation method of casting the high-permeability sand-burning-preventing paint of use, it is characterized in that: it comprises the steps:
One, take refractory aggregate, binding agent, activating agent and carrier as raw material; The quality of binding agent is 2.0%～2.5% of refractory aggregate quality; The quality of activating agent is 0.01%～0.05% of refractory aggregate quality; The quality of carrier is 40%～220% of refractory aggregate quality; Refractory aggregate is one or both the mixture of arbitrary proportion in zirconium English powder, chromite powder; Binding agent is the mixture in phenolic resins and vinsol, ethyl silicate, and wherein the quality of vinsol is 0.1%～0.2% of refractory aggregate quality, and the quality of ethyl silicate is 0.4%～1% of refractory aggregate quality; Carrier is ethanol; Activating agent is APES;
Two, produce standby middle material, with the part ethanol of obtaining, phenolic resins, vinsol are made into respectively to saturated solution;
Three, mixed coating processed saturated solution, ethyl silicate, activating agent APES mix and blend that part ethanol, second step are obtained is 5～15 minutes, stirs, and obtains batch mixing No. one time; In a batch mixing, add gradually zirconium English powder, chromite powder, then stirred 15～30 minutes, add remaining ethanol, stir, obtain rerolling, namely make the high-permeability sand-burning-preventing paint of casting use.
8. the preparation method of the high-permeability sand-burning-preventing paint of casting use according to claim 7, it is characterized in that: the raw material that takes in the first step also comprises thickener, suspending agent and defoamer; Thickener is polyvinyl butyral resin, and the quality of polyvinyl butyral resin is 0.1%～0.5% of refractory aggregate quality; Suspending agent is lithium bentonite, and the quality of lithium bentonite is 1.5%～5.0% of refractory aggregate quality; Defoamer is n-butanol, and the n-butanol quality is 0.01%～0.1% of refractory aggregate quality; Producing in standby middle material of second step also will make its abundant swelling with suitable quantity of water by lithium bentonite, obtains the lithium bentonite of swelling; With part ethanol, polyvinyl butyral resin is made into to saturated solution; The 3rd walks the polyvinyl butyral resin solution that also adds second step to obtain when producing a batch mixing, the lithium bentonite of swelling; When producing rerolling, also to add the defoamer n-butanol.
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| 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 |
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| CN101497105A (en) * | 2009-03-12 | 2009-08-05 | 深圳市景鼎现代科技有限公司 | Cast form water borne coating and technique for preparing the same |
| CN101648802A (en) * | 2009-09-14 | 2010-02-17 | 浦杰 | Composite coating for heat-resisting alloy centrifugal casting tube |
| CN101817058A (en) * | 2010-03-30 | 2010-09-01 | 深圳市景鼎现代科技有限公司 | Shield type coating composition and preparation process of coating thereof |
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| CN102139342A (en) | 2011-08-03 |
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