CN102139342A - 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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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 antiseized sand coating of high osmosis of casting usefulness and preparation method thereof.
Background technology
Cast paint is of a great variety, can be divided into two classes substantially: water based paint and organic solvent coating.Wherein organic solvent coating is applying after light promptly curable, be used with various self-hardening sand technologies, can not need dry, production cycle can be shortened, simplify technology, energy savings reduces the drying plant investment, be to be cast a kind of quick drying paint that the boundary widely uses, be widely used in the production of steel, iron, coloured foundry goods.But large-scale, particularly make slow progress in the production application of heavy section steel castings, this is that casting solidification is slow because of heavy section steel castings pouring temperature height, and temperature retention time is long; And OOS coating permeability is relatively poor, and coating high-temp intensity, the hot cracking resistance that exposes to the sun are low, and gas forming amount is bigger, can't satisfy the abominable working condition of heavy section steel castings, so that foundry goods is prone to defectives 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 orders can be 0～90% respectively, 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 not enough to the penetration of sand mold, coating precipitates caking easily, 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 broken through coating easily and is infiltered sand mold.
Chinese patent application (application number is 200910046096.4) discloses a kind of Zircon powder alcohol group dope that is used 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%; Though present patent application can form fine and close film with the influence of the moisture in the obstruct molding sand to 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 cast(ing) surface certain quality; But as easy scaling loss under the vinsol of binding agent and the thermoplastic phenolic resins high temperature, the high temperature coating intensity difference, foundry goods is easy to generate 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 fill up gap between sand grains and sand grains effectively, prevents penetration; Carrier all adopts isopropyl alcohol in addition, and cost is too high.
Summary of the invention
The objective of the invention is to overcome the above-mentioned deficiency of prior art and a kind of antiseized sand coating of high osmosis of casting usefulness 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 from effectively that molten steel from directly contacting with sand mold to cause the scab defective.
Technical scheme of the present invention is: a kind of antiseized sand coating of high osmosis of casting usefulness, and it is formulated by following raw materials according: refractory aggregate, binding agent, activating agent and carrier; The quality of binding agent is 0.5%～2.5% of a refractory aggregate quality; The quality of activating agent is 0.01%～0.05% of a refractory aggregate quality; The quality of carrier is 40%～220% of a refractory aggregate quality; Described refractory aggregate is one or both the mixture of arbitrary proportion in zirconium English powder, the chromite powder; Described binding agent is one or more the mixture in phenolic resins or phenolic resins and vinsol, the ethyl silicate, wherein the quality of vinsol is 0%～0.5% of a refractory aggregate quality, and the quality of ethyl silicate is 0%～1% of a refractory aggregate quality; Described activating agent is an APES; Described carrier is an ethanol.
The further technical scheme of the present invention is: described raw material also comprises thickener, and thickener is a polyvinyl butyral resin, and the quality of polyvinyl butyral resin is 0.1%～0.5% of a refractory aggregate quality.
The present invention further technical scheme is: described raw material also comprises suspending agent, and suspending agent is a lithium bentonite, and the quality of lithium bentonite is 1.5%～5.0% of a refractory aggregate quality.
The further again technical scheme of the present invention is: described raw material also comprises defoamer, and defoamer is a n-butanol, and the quality of n-butanol is 0.01%～0.1% of a 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 the 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 antiseized sand coating of high osmosis of usefulness, it mainly comprises the steps:
One, takes by weighing refractory aggregate, binding agent, activating agent and carrier as raw material; The quality of binding agent is 0.5%～2.5% of a refractory aggregate quality; The quality of activating agent is 0.01%～0.05% of a refractory aggregate quality; The quality of carrier is 40%～220% of a refractory aggregate quality; Refractory aggregate is one or both the mixture of arbitrary proportion in zirconium English powder, the chromite powder; Binding agent is one or more the mixture in phenolic resins or phenolic resins and vinsol, the ethyl silicate, and wherein the quality of vinsol is 0%～0.5% of a refractory aggregate quality, and the quality of ethyl silicate is 0%～1% of a refractory aggregate quality; Carrier is an ethanol; Activating agent is an APES;
Two, produce standby middle material, phenolic resins or vinsol are made into saturated solution with the part ethanol of obtaining;
Three, mix system coating
Saturated solution, ethyl silicate, activating agent APES that part ethanol, second step are obtained mix stirring 5～15 minutes, stir, and obtain batch mixing No. one time;
In a batch mixing, add zirconium English powder, chromite powder gradually, stirred again 15～30 minutes, add remaining ethanol, stir, obtain rerolling, promptly make the antiseized sand coating of high osmosis of casting usefulness.
Further another technical scheme of the present invention is: the raw material that takes by weighing in the first step also comprises thickener, suspending agent and defoamer; Thickener is a polyvinyl butyral resin, and the quality of polyvinyl butyral resin is 0.1%～0.5% of a refractory aggregate quality; Suspending agent is a lithium bentonite, and the quality of lithium bentonite is 1.5%～5.0% of a refractory aggregate quality; Defoamer is a n-butanol, and the n-butanol quality is 0.01%～0.1% of a refractory aggregate quality; Producing in the standby middle material of second step also will make its abundant swelling with suitable quantity of water with lithium bentonite, obtains the lithium bentonite of swelling; With part ethanol polyvinyl butyral resin is made into saturated solution;
The 3rd step also added second and goes on foot the polyvinyl butyral resin solution that obtains, the lithium bentonite of swelling when producing a batch mixing; When producing rerolling, also to add the defoamer n-butanol.
The primary raw material explanation of using among 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 is bakelite, claims phenolic moulding powder again, phenol and formaldehyde condensation polymer and get; 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 is 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 the organobentonite characteristic again, 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 characteristics:
The coating permeability that the present invention obtains is strong, has good elevated temperature strength and stability, and gas forming amount is little, has humidity resistance preferably in addition; 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, cooperate the activating agent APES, increased substantially the permeance property of coating, impel the coating refractory aggregate can infilter sand mold effectively, fill up gap between sand grains and sand grains, stop molten steel to infiltrate and form penetration; The adding of thickener polyvinyl butyral resin can be controlled the length of penetration of coating in 25 millimeter, avoids coating to penetrate deeply, causes waste; The suspending agent lithium bentonite makes the suspension stability of coating good, is easy to preserve; N-butanol can be eliminated the foam that coating brings because of APES when stirring, improved the stability and the brushability of coating, can also make the burning of coating more even; Except phenolic resins and vinsol, also added the part ethyl silicate in the paint adhesion agent, phenolic resins and vinsol can guarantee that coating has at normal temperatures and well be coated with extension; Ethyl silicate has high temperature bond performance preferably, aggregate in the coating is bonded together closely, assurance coating is hung and strength of coating being coated with of molding sand surface, the continuous high temperature of resisting molten steel washes away, preventing that molten steel from directly contacting with sand mold causes the scab defective, thus the surface quality of assurance foundry goods; The adding of ethyl silicate can also reduce quantity of organic compounds, and the gas forming amount of coating is reduced, and has 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 preceding 0～0.5mm thickness of molding sand coating adopts the granularity of refractory aggregate, the granularity of 0.5～2.5mm thickness employing refractory aggregate is the coating that 250～325 purpose the present invention obtain after the coating, and result of use can be better like this.
In order to be illustrated more clearly in the present invention, enumerate following examples, but it there is not any restriction to scope of invention.
The specific embodiment
Embodiment 1
Take by weighing 50 kilograms in zirconium English powder, 50 kilograms of chromite powders, 1.5 kilograms in 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.
Earlier lithium bentonite is made its abundant swelling with suitable quantity of water, respectively phenolic resins, vinsol, polyvinyl butyral resin are made into saturated solution with part ethanol (alcohol), stand-by; During use (in order to reach best effect, remaining composition is just preparation in use preferably), with 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 zirconium English powder gradually, chromite powder, n-butanol, stir 15～30(again and be preferably 20 minutes) minute, add remaining ethanol and adjust the coating Baume degrees, at this moment the coating Baume degrees between 45～60, makes the antiseized sand coating of high osmosis of casting usefulness substantially.
Embodiment 2-20
Embodiment 2-20 is except material composition and ratio and embodiment 1 to some extent the 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 antiseized sand coating of high osmosis of the casting usefulness that embodiment 1-20 obtains is as shown in table 2 below.
Table 1
Table 2
During use, the preceding 0～0.5mm thickness of molding sand coating, the used refractory aggregate granularity of the coating that the present invention obtains is 325～500 order zirconium English powder and chromite powders, the easier hole that is penetrated into sand mold of this refractory aggregate, 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 the generation that coating chaps in dry and casting process, guarantee that coating stability is with intensity.
Claims (10)
1. antiseized sand coating of high osmosis of casting usefulness, it is characterized in that: it is formulated by following raw materials according: refractory aggregate, binding agent, activating agent and carrier; The quality of binding agent is 0.5%～2.5% of a refractory aggregate quality; The quality of activating agent is 0.01%～0.05% of a refractory aggregate quality; The quality of carrier is 40%～220% of a refractory aggregate quality; Described refractory aggregate is one or both the mixture of arbitrary proportion in zirconium English powder, the chromite powder; Described binding agent is one or more the mixture in phenolic resins or phenolic resins and vinsol, the ethyl silicate, wherein the quality of vinsol is 0%～0.5% of a refractory aggregate quality, and the quality of ethyl silicate is 0%～1% of a refractory aggregate quality; Described activating agent is an APES; Described carrier is an ethanol.
2. the antiseized sand coating of the high osmosis of casting usefulness according to claim 1 is characterized in that: described raw material also comprises thickener, and thickener is a polyvinyl butyral resin, and the quality of polyvinyl butyral resin is 0.1%～0.5% of a refractory aggregate quality.
3. the antiseized sand coating of the high osmosis of casting usefulness according to claim 1 and 2 is characterized in that: described raw material also comprises suspending agent, and suspending agent is a lithium bentonite, and the quality of lithium bentonite is 1.5%～5.0% of a refractory aggregate quality.
4. the antiseized sand coating of the high osmosis of casting usefulness according to claim 1 and 2 is characterized in that: described raw material also comprises defoamer, and defoamer is a n-butanol, and the quality of n-butanol is 0.01%～0.1% of a refractory aggregate quality.
5. the antiseized sand coating of the high osmosis of casting usefulness according to claim 3 is characterized in that: described raw material also comprises defoamer, and defoamer is a n-butanol, and the n-butanol quality is 0.01%～0.1% of a refractory aggregate quality.
6. the antiseized sand coating of the high osmosis of casting usefulness according to claim 5 is characterized in that: 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.
7. the antiseized sand coating of the high osmosis of casting usefulness according to claim 1 and 2 is characterized in that: the granularity of described refractory aggregate is 250～325 orders or 325～500 orders.
8. the antiseized sand coating of the high osmosis of casting usefulness according to claim 5 is characterized in that: the granularity of described refractory aggregate is 250～325 orders or 325～500 orders.
9. preparation method of casting the antiseized sand coating of high osmosis of usefulness, it is characterized in that: it comprises the steps:
One, takes by weighing refractory aggregate, binding agent, activating agent and carrier as raw material; The quality of binding agent is 0.5%～2.5% of a refractory aggregate quality; The quality of activating agent is 0.01%～0.05% of a refractory aggregate quality; The quality of carrier is 40%～220% of a refractory aggregate quality; Refractory aggregate is one or both the mixture of arbitrary proportion in zirconium English powder, the chromite powder; Binding agent is one or more the mixture in phenolic resins or phenolic resins and vinsol, the ethyl silicate, and wherein the quality of vinsol is 0%～0.5% of a refractory aggregate quality, and the quality of ethyl silicate is 0%～1% of a refractory aggregate quality; Carrier is an ethanol; Activating agent is an APES;
Two, produce standby middle material, phenolic resins or vinsol are made into saturated solution with the part ethanol of obtaining;
Three, mix system coating
Saturated solution, ethyl silicate, activating agent APES that part ethanol, second step are obtained mix stirring 5～15 minutes, stir, and obtain batch mixing No. one time;
In a batch mixing, add zirconium English powder, chromite powder gradually, stirred again 15～30 minutes, add remaining ethanol, stir, obtain rerolling, promptly make the antiseized sand coating of high osmosis of casting usefulness.
10. the preparation method of the antiseized sand coating of high osmosis of casting usefulness according to claim 9 is characterized in that: the raw material that takes by weighing in the first step also comprises thickener, suspending agent and defoamer; Thickener is a polyvinyl butyral resin, and the quality of polyvinyl butyral resin is 0.1%～0.5% of a refractory aggregate quality; Suspending agent is a lithium bentonite, and the quality of lithium bentonite is 1.5%～5.0% of a refractory aggregate quality; Defoamer is a n-butanol, and the n-butanol quality is 0.01%～0.1% of a refractory aggregate quality; Producing in the standby middle material of second step also will make its abundant swelling with suitable quantity of water with lithium bentonite, obtains the lithium bentonite of swelling; With part ethanol polyvinyl butyral resin is made into saturated solution; The 3rd step also added second and goes on foot the polyvinyl butyral resin solution that obtains, the lithium bentonite of swelling when producing a batch mixing; When producing rerolling, also to add the defoamer n-butanol.
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