CN103586404A - Heat-insulating coating for casting - Google Patents

Heat-insulating coating for casting Download PDF

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Publication number
CN103586404A
CN103586404A CN201310523546.0A CN201310523546A CN103586404A CN 103586404 A CN103586404 A CN 103586404A CN 201310523546 A CN201310523546 A CN 201310523546A CN 103586404 A CN103586404 A CN 103586404A
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CN
China
Prior art keywords
diatomite
coating
casting
insulating moulding
temperature
Prior art date
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.)
Pending
Application number
CN201310523546.0A
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Chinese (zh)
Inventor
浦巧生
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Wujiang Hydraulic Components Foundry Co Ltd
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Wujiang Hydraulic Components Foundry Co Ltd
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Publication date
Application filed by Wujiang Hydraulic Components Foundry Co Ltd filed Critical Wujiang Hydraulic Components Foundry Co Ltd
Priority to CN201310523546.0A priority Critical patent/CN103586404A/en
Publication of CN103586404A publication Critical patent/CN103586404A/en
Pending legal-status Critical Current

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Abstract

The invention relates to a heat-insulating coating for casting. The heat-insulating coating comprises the following components: by weight, 60-70% of quartz powder, 10-15% of diatomite, 2-3% of organobentonite, 1-2% of powdered steatile, 1-2% of sodium silicate and the balance water. After drying, crushing and impurity-removal, the diatomite undergoes high temperature roasting to remove crystal water and organic matters; and then, the diatomite is crushed and sieved. The heat-insulating coating for casting has advantages of small heat conductivity coefficient, good heat-insulating property and stable chemical properties at high temperature. By the adoption of the coating, service life of casting molds can be prolonged. The coating has good suspension property, viscosity, surface strength and high-temperature crack resistance. Thus, defects of the coating, such as pores, pinholes and the like can be prevented, and quality of castings is raised.

Description

A kind of casting insulating moulding coating
Technical field
The present invention relates to a kind of coating, relate in particular to a kind of casting insulating moulding coating.
Background technology
Coating is to solve scab, improves surface quality of continuous castings effective measures the most.On the model (core) of foundry goods, the object of stenciling coating is the thermal gauge model of regulating system, prevent that mold cavity surface from directly contacting with molten metal, affect tissue and the performance of foundry goods, be conducive to machining, improve surface quality of continuous castings and flatness, make motlten metal be easy to fill die cavity, make foundry goods be easy to take out from casting mold, therefore require coating heat transfer performance low, stability at elevated temperature is good.And existing coating heat transfer coefficient is large, heat conductivility is not good, and has affected the service life of model, has reduced casting quality.
Summary of the invention
The present invention has overcome the deficiencies in the prior art, provide a kind of have good heat-insulating property, can lengthening model service life, improve the coating of casting quality.
For achieving the above object, the technical solution used in the present invention is: a kind of casting insulating moulding coating, it is characterized in that: described insulating moulding coating constituent and weight ratio thereof are: 60%~70% silica flour, 10%~15% diatomite, 2%~3% organobentonite, 1%~2% talcum powder, 1%~2% sodium silicate, all the other are water; Described diatomite drying, fragmentation, decontamination process after high-temperature roasting remove the crystallization water and organic matter, then pulverization process is sieved and is made.
In a preferred embodiment of the present invention, further comprise that described insulating moulding coating constituent and weight ratio thereof are: 68% silica flour, 14% diatomite, 2.5% organobentonite, 1.5% talcum powder, 1.5% sodium silicate, all the other are water; Described diatomite drying, fragmentation, decontamination process after high-temperature roasting remove the crystallization water and organic matter, then pulverization process is sieved and is made.
In a preferred embodiment of the present invention, further comprise that described organobentonite is added in aqueous sodium carbonate after purifying by calcium-base bentonite, by ion-exchange reactions, change sodium bentonite into, then add quaternary ammonium salt to replace and dry to make.
In a preferred embodiment of the present invention, further comprise that described diatomite is dried at 110 ℃~130 ℃ temperature.
In a preferred embodiment of the present invention, further comprise the described diatomite roasting 0.5h~1h under 900 ℃~1100 ℃ high temperature after decontamination is processed.
In a preferred embodiment of the present invention, further comprise that described talcum powder is 1250 orders.
In a preferred embodiment of the present invention, further comprise that the described diatomite through pulverization process sieves in the screen cloth of 200 object 0.075mm.
The invention solves the defect existing in background technology, casting of the present invention is little with insulating moulding coating thermal conductivity factor, heat-proof quality is good, stable chemical performance under high temperature, can extend the service life of cast model, the suspension of coating, viscosity and surface strength, high-temperature resistant property are better, prevent that the defects such as pore, pin hole from appearring in coating, improved the quality of foundry goods.
The specific embodiment
The present invention is further detailed explanation in conjunction with the embodiments now.
An insulating moulding coating, its constituent and weight ratio thereof are: 200 object silica flours 60%~70% are as refractory aggregate, 10%~15% diatomite, 2%~3% organobentonite, 1%~2% talcum powder, 1%~2% sodium silicate, all the other are water; Described diatomite drying, fragmentation, decontamination process after high-temperature roasting remove the crystallization water and organic matter, then pulverization process is sieved and is made.Diatomaceous main component is silica, unicellular aquatic algae bone remains fossil, consists of, and has good heat-insulating property; In its structure, there are many tiny micropores, high adsorption capacity; Diatomite is through processes, and high temeperature chemistry stable performance, has the anti-caking power of enough refractoriness and high temperature; Because its matter is soft, water imbibition is stronger, plays the effect of dispersant in coating, can improve suspension, viscosity and surface strength, the high-temperature resistant property of coating, reduces the roughness of cast(ing) surface.Organobentonite is in order to increase the suspension of coating; Talcum powder, in order to increase dope viscosity, prevents coating sedimentation; Sodium silicate, in order to improve the cohesive force of coating, prevents that the defects such as pore, pin hole from appearring in coating.
Preferably, insulating moulding coating constituent and weight ratio thereof are: 68% silica flour, and 14% diatomite, 2.5% organobentonite, 1.5% talcum powder, 1.5% sodium silicate, all the other are water; Described diatomite drying, fragmentation, decontamination process after high-temperature roasting remove the crystallization water and organic matter, then pulverization process is sieved and is made.
In the present invention, organobentonite is added in aqueous sodium carbonate after purifying by calcium-base bentonite, by ion-exchange reactions, changes sodium bentonite into, then adds quaternary ammonium salt to replace and dry to make.
Further diatomite is dried at 110 ℃~130 ℃ temperature, makes dry rear diatomite water content 3%~7%.
Further, the diatomite roasting 0.5h~1h under 900 ℃~1100 ℃ high temperature after decontamination is processed, removes the crystallization water and organic impurities, keeps the structure of diatomaceous amorphous silica.
Further, through the described diatomite of pulverization process, in the screen cloth of 200 object 0.075mm, sieve, guarantee diatomaceous granularity≤0.045mm; Adopt crushing treatment method, avoid destroying the unique texture of diatom lobe, prevent that diatomaceous micropore is destroyed or stop up.
In the present invention, talcum powder is 1250 orders, can make coating more easily disperse.
Embodiment 1:
An insulating moulding coating, its constituent and weight ratio thereof are: 200 object silica flours 60% are as refractory aggregate, 10% diatomite, 2% organobentonite, 1250 object talcum powder 1%, 1% sodium silicates, all the other are water; Described diatomite drying, fragmentation, decontamination process after high-temperature roasting remove the crystallization water and organic matter, then pulverization process is sieved and is made.Organobentonite is added in aqueous sodium carbonate after purifying by calcium-base bentonite, by ion-exchange reactions, changes sodium bentonite into, then adds quaternary ammonium salt to replace and dry to make.Further diatomite is dried at 110 ℃ of temperature, and the diatomite roasting 1h under 900 ℃ of high temperature after decontamination is processed sieves in the screen cloth of 200 object 0.075mm through the described diatomite of pulverization process.
Embodiment 2:
An insulating moulding coating, its constituent and weight ratio thereof are: 200 object silica flours 70% are as refractory aggregate, 15% diatomite, 3% organobentonite, 1250 object talcum powder 2%, 2% sodium silicates, all the other are water; Described diatomite drying, fragmentation, decontamination process after high-temperature roasting remove the crystallization water and organic matter, then pulverization process is sieved and is made.Organobentonite is added in aqueous sodium carbonate after purifying by calcium-base bentonite, by ion-exchange reactions, changes sodium bentonite into, then adds quaternary ammonium salt to replace and dry to make.Further diatomite is dried at 130 ℃ of temperature, and the diatomite roasting 0.5h under 1100 ℃ of high temperature after decontamination is processed sieves in the screen cloth of 200 object 0.075mm through the described diatomite of pulverization process.
Embodiment 3:
An insulating moulding coating, its constituent and weight ratio thereof are: 200 object silica flours 68% are as refractory aggregate, 14% diatomite, 2.5% organobentonite, 1250 object talcum powder 1.5%, 1.5% sodium silicates, all the other are water; Described diatomite drying, fragmentation, decontamination process after high-temperature roasting remove the crystallization water and organic matter, then pulverization process is sieved and is made.Organobentonite is added in aqueous sodium carbonate after purifying by calcium-base bentonite, by ion-exchange reactions, changes sodium bentonite into, then adds quaternary ammonium salt to replace and dry to make.Further diatomite is dried at 120 ℃ of temperature, and the diatomite roasting 0.5h under 950 ℃ of high temperature after decontamination is processed sieves in the screen cloth of 200 object 0.075mm through the described diatomite of pulverization process.
Casting of the present invention is little with insulating moulding coating thermal conductivity factor, heat-proof quality is good, stable chemical performance under high temperature, can extend the service life of cast model, the suspension of coating, viscosity and surface strength, high-temperature resistant property are better, prevent that the defects such as pore, pin hole from appearring in coating, improved the quality of foundry goods.
Above foundation desirable embodiment of the present invention is enlightenment, and by above-mentioned description, related personnel can, within not departing from the scope of this invention technological thought, carry out various change and modification completely.The technical scope of this invention is not limited to the content on description, must determine technical scope according to claim scope.

Claims (7)

1. a casting insulating moulding coating, is characterized in that: described insulating moulding coating constituent and weight ratio thereof are: 60%~70% silica flour, and 10%~15% diatomite, 2%~3% organobentonite, 1%~2% talcum powder, 1%~2% sodium silicate, all the other are water; Described diatomite drying, fragmentation, decontamination process after high-temperature roasting remove the crystallization water and organic matter, then pulverization process is sieved and is made.
2. a kind of casting insulating moulding coating according to claim 1, is characterized in that: described insulating moulding coating constituent and weight ratio thereof are: 68% silica flour, and 14% diatomite, 2.5% organobentonite, 1.5% talcum powder, 1.5% sodium silicate, all the other are water; Described diatomite drying, fragmentation, decontamination process after high-temperature roasting remove the crystallization water and organic matter, then pulverization process is sieved and is made.
3. a kind of casting insulating moulding coating according to claim 1 and 2, it is characterized in that: described organobentonite is added in aqueous sodium carbonate after purifying by calcium-base bentonite, by ion-exchange reactions, change sodium bentonite into, then add quaternary ammonium salt to replace and dry to make.
4. a kind of casting insulating moulding coating according to claim 1 and 2, is characterized in that: described diatomite is dried at 110 ℃~130 ℃ temperature.
5. a kind of casting insulating moulding coating according to claim 1 and 2, is characterized in that: the described diatomite roasting 0.5h~1h under 900 ℃~1100 ℃ high temperature after decontamination is processed.
6. a kind of casting insulating moulding coating according to claim 1 and 2, is characterized in that: described talcum powder is 1250 orders.
7. a kind of casting insulating moulding coating according to claim 1 and 2, is characterized in that: the described diatomite through pulverization process sieves in the screen cloth of 200 object 0.075mm.
CN201310523546.0A 2013-10-30 2013-10-30 Heat-insulating coating for casting Pending CN103586404A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104439205A (en) * 2014-11-28 2015-03-25 常熟市勤丰铸件厂 Casting pouring process method
CN104496497A (en) * 2014-12-15 2015-04-08 滁州金诺实业有限公司 Heat-insulation fireproof coating applied to pre-buried pipe of vacuum cast aluminium alloy casting
CN104907488A (en) * 2015-06-25 2015-09-16 苏州明志科技有限公司 Anti-crack sand mold coating
CN110935841A (en) * 2019-10-11 2020-03-31 三明学院 High-heat-insulation ultrathin coating for centrifugal casting cylinder sleeve and production method thereof

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Publication number Priority date Publication date Assignee Title
CN1067667A (en) * 1991-06-08 1993-01-06 中国科学院广州能源研究所 A kind of manufacture method of insulating mold coating
US5766686A (en) * 1996-03-01 1998-06-16 North American Refractories Co. Spray insulating coating for refractory articles
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CN103008529A (en) * 2012-11-22 2013-04-03 大连滨城活塞制造有限公司 Metal mold paint for centrifugal casting of cylinder sleeve

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CN1067667A (en) * 1991-06-08 1993-01-06 中国科学院广州能源研究所 A kind of manufacture method of insulating mold coating
US5766686A (en) * 1996-03-01 1998-06-16 North American Refractories Co. Spray insulating coating for refractory articles
CN102430702A (en) * 2011-11-29 2012-05-02 朱小英 Centrifugal cast pipe metal type paint
CN103008529A (en) * 2012-11-22 2013-04-03 大连滨城活塞制造有限公司 Metal mold paint for centrifugal casting of cylinder sleeve

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104439205A (en) * 2014-11-28 2015-03-25 常熟市勤丰铸件厂 Casting pouring process method
CN104496497A (en) * 2014-12-15 2015-04-08 滁州金诺实业有限公司 Heat-insulation fireproof coating applied to pre-buried pipe of vacuum cast aluminium alloy casting
CN104907488A (en) * 2015-06-25 2015-09-16 苏州明志科技有限公司 Anti-crack sand mold coating
CN110935841A (en) * 2019-10-11 2020-03-31 三明学院 High-heat-insulation ultrathin coating for centrifugal casting cylinder sleeve and production method thereof

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Application publication date: 20140219