CN1032820C - Metal-type thermal insulating paint of cast iron - Google Patents

Metal-type thermal insulating paint of cast iron Download PDF

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Publication number
CN1032820C
CN1032820C CN 91109030 CN91109030A CN1032820C CN 1032820 C CN1032820 C CN 1032820C CN 91109030 CN91109030 CN 91109030 CN 91109030 A CN91109030 A CN 91109030A CN 1032820 C CN1032820 C CN 1032820C
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China
Prior art keywords
water
coating
diatomite
bentonite slurry
wilkinite
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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.)
Expired - Fee Related
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CN 91109030
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Chinese (zh)
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CN1060301A (en
Inventor
孔宪候
徐大中
姜不居
阎双景
仲部
宋晓想
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XINGTAI IRON AND STEEL WORKS
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XINGTAI IRON AND STEEL WORKS
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Priority to CN 91109030 priority Critical patent/CN1032820C/en
Publication of CN1060301A publication Critical patent/CN1060301A/en
Application granted granted Critical
Publication of CN1032820C publication Critical patent/CN1032820C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

The present invention relates to metal type heat insulation paint for cast iron, which belongs to the field of heat insulation and preservation paint, and the paint is used for the heat insulation and preservation of metal casting. The paint of the present invention is prepared from 13 to 25 portions by weight of diatomite, 10 to 20 portions by weight of bentonite slurry and 60 to 75 portions by weight of water, and additionally, one or both of 0 to 5 portions by weight of graphite powder and 0 to 5 portions by weight of zircon powder can be added. The paint of the present invention can make osmolar magnets in a casting state basal body of a thin wall part reduced and make ferrite increased.

Description

Metal-type thermal insulating paint of cast iron
The present invention is a kind of metal-type thermal insulating paint of cast iron, is used for the casting of metals adiabatic heat-insulation, belongs to the thermal insulation paint field.
During metal mold cast iron, be coated with one deck refractory materials usually in type, in order to alleviating the heat effect of molten metal to casting mold, the control cooling velocity of casting obtains the tissues needed performance, and improves metal mold work-ing life.
Metal current type cast iron is generally blacking with coating, because its heat conduction is fast, so use casting hardness height, poor toughness that this coating casts out, be difficult to processing, when especially casting the spheroidal graphite cast iron thin-wall part, formed foundry goods tissue is generally perlite, and has a large amount of cementites to produce, and seek out high tenacity, must heat-treat annealing, improve casting cost undoubtedly.
Patent CN86106831A has introduced the combination material of a kind of fire prevention and adiabatic usefulness, and this combination material is made up of Peng Shi perlite, rhombspar, wilkinite etc., is used to spray to the surface of ironware, forms the thermal insulation fire-proof layer.
Patent CN85108731A has introduced a kind of combination material of refractory masses, and it is made up of silicon, aluminium, zircon/zirconium dioxide and aluminum oxide etc., is used to spray to the surface formation refractory masses of other material.
Patent CN85100079A has introduced the garden shape sample cup formulation for coating material that a kind of cast iron thermal analysis instrument is used, and this coating is made up of zirconium English powder, fireclay, wilkinite, dextrin water, is used for protecting thermocouple head.
The described coating of above-mentioned several patents all is to be used for forming on protection object separately long-term protective layer; general difficult drop-off; and when metal mold cast iron, be generally refractory paint of spraying, and cast a foundry goods, coating preferably comes off along with finishing of foundry goods thereupon or is easy to cleaning.
For this reason, the present invention provides a kind of metal-type thermal insulating paint of cast iron, and this coating is made up of refractory materials diatomite, binding agent bentonite slurry and water.Can add one of a small amount of Graphite Powder 99 and zirconium English powder or the two in addition, to change the thermal conductivity and the fire performance of coating.
Below metal-type thermal insulating paint of cast iron of the present invention is described in detail:
Each raw material weight degree is as follows in the coating of the present invention:
Diatomite: 13-25 bentonite slurry: 10-20
Water: 60-75 Graphite Powder 99: 0-5 zirconium English powder: 0-5.
Wherein: the prescription of bentonite slurry is (weight percent)
Wilkinite: water=1: 5-12
The preparation technology of each composition of coating of the present invention is as follows:
One, selects preparation diatomite
Diatomite is lost ilium nuclear by the fossilisation of the unicellular aquatic algae of stone algae and is formed, has special vesicular structure, thereby has a good insulation capacity, its main component is SiO2, has higher refractoriness, temperature<1350 ℃, structure does not have much variations, still keeps higher heat-insulating property.
Diatomaceous composition in the coating of the present invention and preparation require:
1, prepares SiO2 content in the selected diatomite of this coating greater than 85%.
2, the selected diatomite of preparation coating of the present invention will be through calcining, to remove diatomaceous water of constitution and organic substance, calcining temperature is 800-1000 ℃, can in electric furnace, down-draft furnace, tunnel furnace etc., calcine, calcination time is decided according to factors such as the type of furnace and charging methods, generally, calcine the diatomaceous burning decrement in back≤0.8% at 5-10 hour.
3, after the diatomite oven dry that preparation coating of the present invention is selected for use, be crushed to the 200-300 order with ordinary method after, carry out super-fine processing with micronizer mill again, make diatomaceous granularity requirements be: 0~14 μ>60%, greater than 100 μ<1.0%.
Two, bentonitic selection
Wilkinite main mine material consists of montmorillonite, and it mixes formation colloidal solution with water, be used as binding agent and suspension agent in coating, and it can make coating have higher dry strength.
Prepare the used wilkinite of coating of the present invention and should satisfy following requirement:
1, smectite content 〉=70%;
2, granularity: 95% by 200 orders;
3,2 hours water-intake rate 〉=500ml;
Impurity≤5%.
Three, Graphite Powder 99, zirconium English powder
The purpose that adds Graphite Powder 99 and zirconium English powder is in order to adjust the thermal conductivity of coating, to control cooling velocity of casting, thereby reach required standard weave and graphite shape.
Carbon content>85% for preparing the selected Graphite Powder 99 of coating of the present invention, granularity are 90% by 260 orders.
The ZrO2 amount of containing>70% for preparing the selected zirconium English powder of coating of the present invention, granularity are 90% by 320 orders.
When preparing this coating, earlier choose diatomite and wilkinite on request, be mixed with bentonite slurry by aforementioned formula, after press formulation for coating material again and preparing, stirring promptly can be used as the coating of metal mold.
Coating of the present invention, so it has good performance, this be because:
This coating has selected for use diatomite as its refractory materials, because diatomite has vesicular structure, tap density is little, is about 0.25g/cm 2, thermal conductivity is little, and the thermal conductivity of diatomite dry powder is 0.022, the selected diatomite of this coating has been taked some special measures in preparation, as comminution by gas stream, be processed into ultrafine particle, and can keep its vesicular structure, used bentonite slurry is a colloidal solution, so the suspension of this coating is good, heat insulating ability is good, can not block up rifle during spraying, again because of diatomite through high-temperature calcination, can significantly reduce its high temperature gas forming amount, make the unlikely generation gas hole defect of foundry goods.
During with this coating, can make thin-wall part, when the 5-8mm, cementite reduces to below 3% in the as cast condition matrix as thickness, if adopt suitable inoculation process, its ferrite content can bring up to 70% by 30%.

Claims (7)

1, a kind of metal-type thermal insulating paint of cast iron that contains refractory materials, binding agent and water is characterized in that said refractory materials is a diatomite, binding agent is a bentonite slurry, the weight percent of above-mentioned three kinds of compositions is: diatomite 13-25, bentonite slurry 10-20, water 60-75, said diatomite contains the SiO more than 85% 2And through 800-1000 ℃ of calcining, granularity behind the comminution by gas stream is: 0-10 μ>60%, more than 100 μ<1.0%, smectite content in the said wilkinite 〉=70%, granularity are 95%<200 order, 2 hours water-intake rate 〉=500ml, impurity≤5%, the weight percent of said bentonite slurry is: wilkinite: water=1: 5-12.
2, coating as claimed in claim 1 is characterized in that in this coating adding in Graphite Powder 99 and the zirconium English powder any or all, the weight percent of various compositions is: diatomite 13-25, bentonite slurry 10-20, water 60-75, Graphite Powder 99 0-5, zirconium English powder 0-5.
3, coating as claimed in claim 2 is characterized in that said Graphite Powder 99 carbon content>85%, and granularity is 90%<260 order, the ZrO of zirconium English powder 2Content>70%, granularity are 90%<320 order.
4, coating as claimed in claim 1 is characterized in that the ratio of wilkinite and water is 1: 10 in the bentonite slurry, and each composition is diatomite 45Kg, bentonite slurry 40Kg, water 200Kg.
5, coating as claimed in claim 1 is characterized in that the ratio of wilkinite and water is 1: 10 in the bentonite slurry, and each composition is diatomite 60Kg, bentonite slurry 35Kg, water 210Kg.
6, coating as claimed in claim 3 is characterized in that the ratio of wilkinite and water is 1: 10 in the said bentonite slurry, and each composition is diatomite 40Kg, bentonite slurry 40Kg, water 200Kg, Graphite Powder 99 10Kg.
7, coating as claimed in claim 3 is characterized in that the ratio of wilkinite and water is 1: 10 in the said bentonite slurry, and each composition is bentonite slurry 40Kg, diatomite 40Kg, water 200Kg, zirconium English powder 10Kg.
CN 91109030 1991-09-24 1991-09-24 Metal-type thermal insulating paint of cast iron Expired - Fee Related CN1032820C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 91109030 CN1032820C (en) 1991-09-24 1991-09-24 Metal-type thermal insulating paint of cast iron

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 91109030 CN1032820C (en) 1991-09-24 1991-09-24 Metal-type thermal insulating paint of cast iron

Publications (2)

Publication Number Publication Date
CN1060301A CN1060301A (en) 1992-04-15
CN1032820C true CN1032820C (en) 1996-09-18

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Application Number Title Priority Date Filing Date
CN 91109030 Expired - Fee Related CN1032820C (en) 1991-09-24 1991-09-24 Metal-type thermal insulating paint of cast iron

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CN (1) CN1032820C (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1045096C (en) * 1994-04-23 1999-09-15 华中理工大学 Metal type coating series
CN100439006C (en) * 2003-08-14 2008-12-03 律泉精密股份有限公司 Super high temperature gravity casting method
CN101259517B (en) * 2008-04-14 2010-06-09 戚建明 Double-roller rolling strip steel machine side seal board surface recombination coating and its preparation method and spraying coating method
CN102688981B (en) * 2012-06-20 2015-02-18 王金梅 Calcined kaolin water-based composite coating, and preparation method of composite coating
CN102873264B (en) * 2012-08-31 2015-05-13 太仓科博尔精密铸业有限公司 Low-carbon steel resin sand mold casting coating and preparation method thereof
CN103624209B (en) * 2013-10-24 2016-05-04 富蕴县健鑫还原铁铸造有限公司 A kind of centrifugal casting pipe mould spray paint
CN106752476A (en) * 2016-12-15 2017-05-31 苏州富艾姆工业设备有限公司 A kind of high temperature modular flange
CN106752143B (en) * 2016-12-19 2019-10-01 华南理工大学 A kind of calcined diatomite Non-expansive fireproof paint

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CN1060301A (en) 1992-04-15

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