CN103111581B - Preparation method for inorganic binder and application thereof - Google Patents
Preparation method for inorganic binder and application thereof Download PDFInfo
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- CN103111581B CN103111581B CN201310062533.8A CN201310062533A CN103111581B CN 103111581 B CN103111581 B CN 103111581B CN 201310062533 A CN201310062533 A CN 201310062533A CN 103111581 B CN103111581 B CN 103111581B
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Abstract
The invention discloses a casting inorganic binder suitable for curing by hot air, a preparation method and application thereof, wherein the binder contains 30-40 parts of 200-400-mesh aluminium hydroxide, 140-180 parts of 80-90% phosphoric acid, 6-12 parts of 200-400-mesh boric acid, 10-20 parts of 200-400-mesh magnesium carbonate, 5-10 parts of 200-400-mesh zinc oxide, and 150-280 parts of water. The binder disclosed by the invention is cured by hot air; dust pollution of adding a powder curing agent when the sand is mixed is avoided; core sand can be used for a long period of time; no substance with poison or pungent odor is discharged in the whole process; the poured cast oil sand is easily cleaned; and the workload of a worker is reduced.
Description
Technical field
The invention belongs to chemical field, be specifically related to a kind of the casting inorganic binder preparation method and the application thereof that are applicable to hot-air solidification.
Background technology
The binding agent of moulding in current Foundry Production, coremaking is mainly divided into organic and inorganic two large classes, organic binder bond (i.e. organic resin) adhesion strength is high, curing agent is liquid, be convenient to automation quantitatively produce, do not produce dust pollution during mulling, but organic resin sand produces toxic gas in casting process, as bioxin, ammonia, sulfur dioxide etc., environmental pollution is serious, and its cost is very high simultaneously.Inorganic binder meets the environmentally friendly requirement that the Party Central Committee proposes, current production using more is clay and waterglass, clay-bonded sand (mostly being wet type) is generally used for moulding, and not high concerning its intensity coremaking, the foundry goods of production often has the defects such as pore; Waterglass may be used for coremaking, low price, nonpoisonous and tasteless, all compares environmental protection in moulding, coremaking and casting process, but its sand mold (core) collapsibility is poor.
The phosphate binders of existing bibliographical information is the binding agent of low degree of neutralization, and its major defect is:
1. in synthetic binder process, material is directly added in reactor, when material is powder, as magnesium carbonate, can be wrapped in together when joining in muciform reactant, fully to react required time very long, often have the solid residue not having complete reaction, this is also the key factor causing binding agent instability.
2. binding agent post-synthesis phase is in order to reach required density, density-add water (or continuing heating) to need to iterate through survey density-add water (or continuing heating)-survey ... length consuming time, be unfavorable for producing, and sometimes there will be add water after binding agent become muddy, also cannot reach pellucidity all the time even if heat again, reduce the stability of binding agent.
3. phosphate sand sclerosis mode is from hard and hard two kinds of heat, and the former is solid, powdery when mulling because of curing agent thus causes a large amount of dust pollution, and production line not easily realizes automation quantifying feed, and the mixed sand up time is short.The latter's heat hard heat time is long, cost is high, and heat hard after sand mold (core) cause shelf stability poor because of moisture absorption, adopt high degree of neutralization binding agent can solve the problem of hard sand mold (core) shelf stability of heat to a certain extent, but the poor stability of high degree of neutralization binding agent self, deposit in process and have crystal precipitation, binding agent quality declines, and sand mold (core) performance prepared thus greatly declines and can not use even completely.
Given this, the present invention develops a kind of novel environment-friendly inorganic binder, mainly solve in three problems that at present such binding agent exists at least one or all:
One is change charging process in building-up process, and adjustment component proportioning, solves the problem of high degree of neutralization binding agent poor stability;
Because binding agent of the present invention is used on the sand mold (core) of hot-air solidification, this curing mode yet there are no report both at home and abroad in phosphate binders uses, it is different from certainly hard and heat is hard, therefore except high magnesium carbonate, also zinc oxide is added in this binder formula, increase binding agent neutral and alkali amount of substance, its sand mold (core) applying hot-air solidification is made to have good resistance to water soak and shelf stability, but they can make binding agent stability greatly decline, the present invention is by changing the feed postition of powder, the measures such as ultrasonic oscillation are adopted to solve the problem of this kind high degree of neutralization binding agent poor stability after adjustment component proportion and synthesis.
Two is simplify binding agent production process, and binding agent synthesize and directly obtains required density afterwards, does not need to go to adjust again, also improves the stability of binding agent;
Three is the binding agent moulding, the coremaking that adopt this high degree of neutralization, employing hot-air solidifies, directly liquid-containing binder is added during mulling, directly blowing hot-air after moulding, coremaking makes sand mold (core) solidify generation intensity, decrease such binding agent and be applied to dust pollution when hard, it also avoid powdered curing agent quantitatively cannot cause carrying out automated production; Simultaneously owing to adding zinc oxide in binding agent, resistance to water soak and the shelf stability of the rear sand mold (core) of hot-air solidification can be improved.Smallclothes simple shape, wall thickness being less than to 30mm are generally 30s ~ 2min hardening time, and the large part that complex-shaped, wall thickness is greater than 50mm is generally 3 ~ 5min hardening time, and production efficiency is high.
Summary of the invention
The object of this invention is to provide a kind of the casting inorganic binder, preparation method and the application thereof that are applicable to hot-air solidification.For achieving the above object, technical scheme of the present invention is as follows:
One aspect of the present invention relates to a kind of binding agent, its formula contains: 30-40 weight portion 200-400 object aluminium hydroxide, 140-180 weight portion concentration are the phosphoric acid of 80-90%, 6-12 weight portion 200-400 object boric acid, the water of 10-20 weight portion 200-400 object magnesium carbonate and 5-10 weight portion 200-400 object zinc oxide, 150-280 weight portion.
In a preferred embodiment of the present invention, described binding agent contains or does not contain other component; Preferably, described binding agent is inorganic binder, does not namely contain organic principle in formula.
In another preferred embodiment of the present invention, described binding agent density is 1.45g/cm
3~ 1.55g/cm
3.
The present invention also relates to the preparation method of above-mentioned binding agent on the other hand, it comprises the steps: the water of aluminium hydroxide and 25-35% formula ratio to mix, start agitator, be heated to boiling, slowly add phosphoric acid again, as clear as crystal to reactant, add boric acid again to reacting transparent, slowly add in mixed liquor after the water of magnesium carbonate and 40-50% formula ratio is mixed, to react transparent after again continue heating 25-35 minute, slowly add in mixed liquor after finally again zinc oxide and remaining water being mixed, react to the transparent mucus of solution, continue heating 25-35 minute more afterwards, sonic oscillation is carried out after its cooling.
The invention still further relates to above-mentioned binding agent or the application of the binding agent prepared by above-mentioned preparation method in moulding, coremaking, described moulding, coremaking comprise the steps: that the binding agent adding 2-4% weight proportion in roughing sand is with mixed molding sand processed, get a certain amount of molding sand and carry out moulding, coremaking, then pass into hot-air 30s-5min and harden.
In a preferred embodiment of the present invention, the described molding sand up time can reach more than 10 hours, and sand mold (core) can be stablized and deposits more than 1 week.
Binding agent of the present invention adopts hot-air sclerosis, do not need to add powdered curing agent, eliminate dust pollution during mulling, and the core sand up time is long; In addition, binding agent mulling of the present invention, moulding, coremaking and cast etc. are not until have the poisonous mass emissions having penetrating odor in casting cleaning overall process; Binding agent collapsibility of the present invention is good, and the foundry goods old sand cleaning after cast easily, alleviates workman's workload; Binding agent of the present invention is moderate, and when production equal in quality foundry goods, its cost is minimum.
Detailed description of the invention
Below in conjunction with instantiation, the present invention is described in detail.
Embodiment 1: the production of binding agent and performance measurement
Target: in binder formula, each component is 36 gram of 300 object aluminium hydroxide, 163 grams of concentration is the phosphoric acid of 85%, 8 gram of 300 object boric acid, 15 gram of 300 object magnesium carbonate and 10 gram of 300 object zinc oxide and 225 grams of water.
Synthetic method:
First aluminium hydroxide and 60 grams of water being mixed adds in container, start agitator (until end of synthesis), be heated to boiling, slowly add phosphoric acid again, as clear as crystal to reactant, add boric acid again to reacting transparent, slowly add in mixed liquor after again magnesium carbonate and 110 grams of water being mixed, to react transparent after again continue heating 25-35 minute, slowly add in mixed liquor after finally again zinc oxide and remaining water being mixed, react to the transparent mucus of solution, continue heating 25-35 minute more afterwards, after its cooling, carry out sonic oscillation.
Physicochemical property detects: adopt bottle method to measure and densitometer mensuration the combined detection, recording density is 1.534g/cm
3, meet the requirements.Binding agent adopts reagent bottle sealing preservation 8 months still transparent, does not have crystal to separate out, shows its good stability.
Embodiment 2: adopt hot-air solidification to prepare the core of wall thickness 50mm
Method: add 3% this binding agent in roughing sand, configuration molding sand, the standard specimen of preparation φ 50 × 50mm is some, then passes into 200 DEG C, pressure is delivery after the hot-air 2 ~ 3min of 0.15 ~ 0.25MPa, the compression strength of test sample after its cooling, random selecting 5 samples, compression strength is respectively: 2.01MPa, 1.98MPa, 2.13MPa, 2.05MPa, 2.24MPa.Random selecting 3 samples, longitudinally cut open, and visible sample is completely thoroughly hard.
Embodiment 3: adopt hot-air solidification to prepare the core of wall thickness 30mm
Method: add 3% this binding agent in roughing sand, configuration molding sand, the sample of preparation φ 30 × 30mm is some, then passes into 200 DEG C, pressure is delivery after the hot-air 30 ~ 60s of 0.15 ~ 0.25MPa, treat the compression strength of its cooling test sample, random selecting 5 samples, compression strength is respectively: 1.65MPa, 1.88MPa, 2.22MPa, 1.79MPa, 1.80MPa.Random selecting 3 samples, longitudinally cut open, and visible sample is completely thoroughly hard.
Embodiment 4: the shelf stability adopting hot-air solidification test sample
After sand mold (core) shelf stability represents sclerosis, sand mold (core) is being deposited in process owing to absorbing the phenomenon that moisture in air causes its intensity to decline.Represent with the degree that probe intensity declines.
In roughing sand, add 3% this binding agent, configuration molding sand, the container of the molding sand sealing after mixing installs, the standard specimen getting a certain amount of sand conditioning φ 50 × 50mm is as required some, then pass into 200 DEG C, pressure is delivery after the hot-air 2 ~ 3min of 0.15 ~ 0.25MPa, the compression strength of test sample after its cooling, random selecting 5 samples, compression strength is respectively: 1.94MPa, 2.32MPa, 2.15MPa, 2.05MPa, 1.86MPa.Remaining sample is put and is deposited 7 days in atmosphere, random selecting every day 5 samples, test compression strength, and test result is:
1st day: 1.94MPa, 2.32MPa, 2.15MPa, 2.05MPa, 1.86MPa.Average: 2.064MPa
2nd day: 1.96MPa, 1.67MPa, 1.89MPa, 2.01MPa, 1.99MPa.Average: 1.904MPa
3rd day: 1.78MPa, 2.34MPa, 1.97MPa, 1.67MPa, 2.11MPa.Average: 1.974MPa
4th day: 2.09MPa, 1.86MPa, 1.78MPa, 1.69MPa, 2.06MPa.Average: 1.896MPa
5th day: 2.01MPa, 1.86MPa, 2.05MPa, 1.58MPa, 1.76MPa.Average: 1.852MPa
6th day: 1.75MPa, 1.69MPa, 2.01MPa, 1.57MPa, 1.67MPa.Average: 1.738MPa
7th day: 1.56MPa, 1.49MPa, 1.98MPa, 2.15MPa, 1.58MPa.Average: 1.752MPa
As shown in the above results, after the sample after sclerosis deposits 7 days, intensity rate of descent is only 15.1%, shows that core prepared by this binding agent adopts the rear shelf stability of hot-air solidification good.
Embodiment 5: the molding sand up time tests
After molding sand is mixed, because dehydration or chemical reaction cause moulding-sand property to decline in put procedure, the sample loss of strength 20% compared with the sample of new sand conditioning prepared again after placing certain time, so, this time is up time of molding sand, exceedes this time molding sand and just can not re-use.
3% this binding agent is added in roughing sand, configuration molding sand, the container of the molding sand sealing after mixing installs, get the standard specimen 5 of a certain amount of sand conditioning φ 50 × 50mm at regular intervals, then 200 DEG C are passed into, pressure is delivery after the hot-air 2 ~ 3min of 0.15 ~ 0.25MPa, the compression strength of test sample after its cooling, and test result is:
The sample compression strength of new sand conditioning is respectively: 1.92MPa, 1.74MPa, 2.23MPa, 1.89MPa, 1.76MPa.Average: 1.908MPa.
The compression strength preparing sample after depositing the mixing of the molding sand after 5 hours is again: 1.82MPa, 1.74MPa, 1.53MPa, 1.79MPa, 1.56MPa.Average: 1.688MPa
The compression strength preparing sample after depositing the mixing of the molding sand after 10 hours is again: 1.54MPa, 1.37MPa, 1.87MPa, 1.58MPa, 1.69MPa.Average: 1.61MPa
The compression strength preparing sample after depositing the mixing of the molding sand after 24 hours is again: 2.12MPa, 1.45MPa, 1.36MPa, 1.62MPa, 1.45MPa.Average: 1.6MPa
As shown in the above results, the up time of molding sand is long, and the sample compression strength rate of descent that molding sand sealing preservation was prepared after 24 hours is only 16.14%.
The above, be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, and any change of expecting without creative work or replacement, all should be encompassed within protection scope of the present invention.Therefore, the protection domain that protection scope of the present invention should limit with claims is as the criterion.
Claims (4)
1. an inorganic binder preparation method, binder formula contains: 30-45 weight portion 200-400 object aluminium hydroxide, 140-180 weight portion concentration is the phosphoric acid of 80-90%, 6-12 weight portion 200-400 object boric acid, 10-20 weight portion 200-400 object magnesium carbonate, the water of 5-10 weight portion 200-400 object zinc oxide and 150-280 weight portion, the preparation method of binding agent comprises the steps: the water of aluminium hydroxide and 25-35% formula ratio to mix, start agitator, be heated to boiling, slowly add phosphoric acid again, as clear as crystal to reactant, add boric acid again to reacting transparent, slowly add in mixed liquor after the water of magnesium carbonate and 40-50% formula ratio is mixed, to react transparent after again continue heating 25-35 minute, slowly add in mixed liquor after finally again zinc oxide and remaining water being mixed, react to the transparent mucus of solution, continue heating 25-35 minute more afterwards, sonic oscillation is carried out after its cooling.
2. preparation method according to claim 1, wherein said binding agent density is 1.45g/cm
3~ 1.55g/cm
3.
3. the application of the inorganic binder prepared by preparation method according to claim 1 and 2 in molding and core making, described molding and core making comprises the steps: to add the mixed molding sand processed of binding agent of 2-4% weight proportion in roughing sand, get a certain amount of molding sand and carry out moulding, coremaking, then pass into hot-air 30s-5min and solidify.
4. application according to claim 3, it is characterized in that molding sand up time of the system of mixing reach more than 10 hours, the core of preparation can be stablized and deposits more than 1 week.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310062533.8A CN103111581B (en) | 2013-02-27 | 2013-02-27 | Preparation method for inorganic binder and application thereof |
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|---|---|---|---|
| CN201310062533.8A CN103111581B (en) | 2013-02-27 | 2013-02-27 | Preparation method for inorganic binder and application thereof |
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| CN103111581A CN103111581A (en) | 2013-05-22 |
| CN103111581B true CN103111581B (en) | 2015-07-22 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104289661B (en) * | 2014-09-10 | 2016-08-24 | 湖北工业大学 | The preparation of phosphate inorganic adhesive precoated sand and forming method thereof |
| CN104668445A (en) * | 2014-11-30 | 2015-06-03 | 沈阳工业大学 | Alcohol-based hot hard zinc phosphate core binder and preparation method and using method thereof |
| CN104815943B (en) * | 2015-03-04 | 2018-05-01 | 宁夏共享化工有限公司 | A kind of used in aluminium alloy casting modified phosphate inorganic binder and preparation method thereof |
| CN106311960A (en) * | 2015-06-23 | 2017-01-11 | 姚伟 | Bonding agent and preparing method thereof |
| CN105127361B (en) * | 2015-08-31 | 2017-06-20 | 宁夏共享化工有限公司 | A kind of 3D sand molds printing composite phosphate inorganic binder and preparation method thereof |
| CN108405794B (en) * | 2018-03-12 | 2019-10-25 | 湖北工业大学 | A kind of hot core sand inorganic binder and preparation method thereof |
| CN108580796B (en) * | 2018-05-31 | 2019-09-10 | 重庆长江造型材料（集团）股份有限公司 | A kind of casting inorganic binder and preparation method thereof |
| CN110170612B (en) * | 2019-05-28 | 2020-10-13 | 湖北工业大学 | Method for improving fluidity of inorganic resin molding sand and application method thereof |
| CN110508747A (en) * | 2019-09-17 | 2019-11-29 | 江苏泽恩汽机车部品制造有限公司 | A kind of sand mould casting method |
| CN113547068B (en) * | 2021-08-06 | 2023-10-20 | 重庆长江造型材料（集团）股份有限公司 | Binder for casting molding sand and application thereof |
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| CN102177000A (en) * | 2008-10-10 | 2011-09-07 | 研磨剂与耐火品研究与开发中心C.A.R.R.D.有限公司 | Abrasive grain agglomerates, process for the production thereof and the use thereof for producing abrasives |
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Patent Citations (4)
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| US4588013A (en) * | 1984-04-12 | 1986-05-13 | Bcira | Binders for foundry cores and moulds |
| US6139619A (en) * | 1996-02-29 | 2000-10-31 | Borden Chemical, Inc. | Binders for cores and molds |
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