CN103100658A - Method for preparing solid-mold casting coating material for cast iron - Google Patents

Method for preparing solid-mold casting coating material for cast iron Download PDF

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Publication number
CN103100658A
CN103100658A CN2012105310842A CN201210531084A CN103100658A CN 103100658 A CN103100658 A CN 103100658A CN 2012105310842 A CN2012105310842 A CN 2012105310842A CN 201210531084 A CN201210531084 A CN 201210531084A CN 103100658 A CN103100658 A CN 103100658A
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parts
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water
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CN2012105310842A
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CN103100658B (en
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夏坤财
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Xiangyang jinnaite mechanical Limited by Share Ltd
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Wuhu Hengkun Auto Parts Co Ltd
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Abstract

The invention discloses a method for preparing a solid-mold casting coating material for cast iron. According to the method, the solid-mold casting coating material is prepared from the following ingredients in parts by weight: 65-75 parts of quartz powder, 5-7 parts of wood ash, 10-12 parts of corundum powder, 10-12 parts of sodium bentonite, 4-6 parts of nano attapulgite, 1-2 parts of lignosulfonic acid, 2-4 parts of water glass, 2-4 parts of sodium borate, 5-7 parts of starch paste, 1.4-1.6 parts of silica sol, 1-2 parts of nanoscale ceramic powder, 0.5-0.8 part of red ferric oxide powder and 525-535 parts of water. The solid-mold casting coating material prepared by the method has excellent gas permeability and quick-drying performance in both high-temperature environments and low-temperature environments, thereby being capable of meeting the production requirements of large-sized cast parts.

Description

A kind of cast iron preparation method of full-mold casting coating
Technical field
The present invention relates to casting field, particularly a kind of cast iron preparation method of full-mold casting coating.
Background technology
The disperse system that full-mold casting coating is comprised of the material of multiple different in kind, its composition mainly comprises the compositions such as refractory material, binding agent, carrier, nano-attapulgite and special additive, needs coating good processing performance, service behaviour, quality stability are arranged and apply reappearance.Full-mold casting coating is coated in the outer surface of foamed polystyrene pattern, could the moulding cast after the coating drying.Foamed plastics is airtight, and heat distortion temperature low (approximately 70 ℃ of left and right) is poor to the affinity of water; Liquid residue after foamed plastics melted by heating, gasification is many, and gas forming amount is large, if these gases and liquid residue can not in time be discharged, foundry goods will produce the carbon defects such as gas, carburetting, Surface Wrinkle in iron.These characteristics have determined that full-mold paint should possess following performance requirement, and namely coating should have good wetability and being coated with property, good high-temperature resistant property and elevated temperature strength and good hot permeability.
The resistance to elevated temperatures of the cast paint of prior art is relatively poor, can only be fit to shorter finding of high-temperature process time (in 200kg) and produce, and can not adapt to for the production of heavy castings (in 20 tons) and small lot handwork.Have the production technology that resistant to elevated temperatures performance can be applicable to heavy castings, but its manufacturing cost is higher, and can not be applicable to manual brushing, this coating is black, easily causes the image of working environment black pollution.
Summary of the invention
For the deficiencies in the prior art, the purpose of this invention is to provide a kind of cast iron preparation method of full-mold casting coating, all have quick-drying, quick-drying, good gas permeability and drip-dry full-mold casting coating under high temperature, low temperature environment, can satisfy the heavy castings production requirement.
Technical scheme of the present invention is as follows:
A kind of cast iron is comprised of following component in weight portion: silica flour 65-75 part, trees ashes 5-7 part with the preparation method of full-mold casting coating, schmigel 10-12 part, sodium bentonite 10-12 part, nano-attapulgite 4-6 part, lignin sulfonic acid 1-2 part, waterglass 2-4 part, Boratex 2-4 part, starch paste 5-7 part, Ludox 1.4-1.6 part, nanometer scale ceramics powder 1-2 part, ferric oxide red powder 0.5-0.8 part, fluorite powder 1-2 part, vermiculite power 3-4 part, colliery powder 1-2 part; Water 55-65 part, described preparation method comprises the steps:
1) the trees ashes were soaked 3-4 hour with 12-15% sulfuric acid, the deionized water washing, soaked 2-3 hour with the 10-12% sodium hydroxide solution again, extremely neutral with the deionized water washing again, then, add the starch paste, the NaOH powder of 7-9%, the suitable quantity of water that are equivalent to its weight 5-8% to mix rear pelletizing and be broken into modification trees ash particles after 2-3 hour in calcining under 460-500 ℃;
2) the modification trees ash particles that above-mentioned steps is obtained is mixed with the water of nano-attapulgite, 1/3 weight, and stirring is heated to 150-160 ℃, is incubated 1-2 hour, stove is chilled to 55 ℃, is incubated 1-2 hour, then is heated to 100-120 ℃, be incubated 1 hour, be cooled to normal temperature with 10 ℃/hour;
3) schmigel, sodium bentonite, nanometer scale ceramics powder, starch paste, the waterglass with above-mentioned weight portion mixes with the water of 1/4 weight, and fully stirs, and then standing 40-60min, then slowly be heated to 75-85 ℃ and fully stirring;
4) with step 2) water of product, step 3) product, silica flour, Ludox, ferric oxide red powder, fluorite powder, vermiculite power, colliery powder, residuals weight adds in reactor, open reactor, mixing speed is: 110-120r/min, add other raw material in stirring downhill reaction still, the temperature that heats simultaneously reactor slowly rises to 75-85 ℃, constant temperature stirs 14-18min, grinds, gets final product.
Compared with prior art, the present invention has following beneficial effect:
1) on the basis of great many of experiments, determined composition and separately the content of aggregate, nano-attapulgite, bonding agent and the auxiliary material of coating, make the effect between above-mentioned each component reach collaborative, the combination property of coating is improved.Full-mold casting coating of the present invention had both reached high anti-stick sand ability, rigidity and the resistance to elevated temperatures of raising apperance, minimized cost again.Optimization allotment through aggregate and various additives forms high current sex change fluid, all reaches better state with foamed polystyrene pattern wetability and brushability.Facts have proved, this coating just can reach the above paint thickness of 1.7mm through 2 times brushings, and the anti-stick sand that can satisfy heavy castings requires and carry needs.
2) full-mold casting coating of the present invention has good suspension and thixotropy, also has good gas permeability and higher surface strength, and preparation technology is simple, easy to operate, abundant raw materials, production cost are low.Full mold cast(ing) surface with its production is bright and clean, without carbon defects such as elephant skin; Coating is easy to peel off, and is convenient to cleaning.
The specific embodiment
A kind of cast iron is comprised of following component in weight portion (kilogram): 75 parts of silica flours, 7 parts, trees ashes with the preparation method of full-mold casting coating, 12 parts of schmigels, 12 parts of sodium bentonites, 4 parts of nano-attapulgites, 1 part of lignin sulfonic acid, 4 parts of waterglass, 4 parts of Boratexes, 7 parts of starch pastes, 1.4 parts of Ludox, 1 part, nanometer scale ceramics powder, 0.8 part of ferric oxide red powder, 2 parts, fluorite powder, 3 parts of vermiculite powers, 1 part of colliery powder; 64 parts, water, the preparation method comprises the steps:
1) the trees ashes were soaked 3-4 hour with 12-15% sulfuric acid, the deionized water washing, soaked 2-3 hour with the 10-12% sodium hydroxide solution again, extremely neutral with the deionized water washing again, then after 2-3 hour, add the starch paste that is equivalent to its weight 8%, 9% NaOH powder, the rear pelletizing of suitable quantity of water mixing to be broken into modification trees ash particles in calcining under 460-500 ℃;
2) the modification trees ash particles that above-mentioned steps is obtained is mixed with the water of nano-attapulgite, 1/3 weight, and stirring is heated to 150-160 ℃, is incubated 1-2 hour, stove is chilled to 55 ℃, is incubated 1-2 hour, then is heated to 100-120 ℃, be incubated 1 hour, be cooled to normal temperature with 10 ℃/hour;
3) schmigel, sodium bentonite, nanometer scale ceramics powder, starch paste, the waterglass with above-mentioned weight portion mixes with the water of 1/4 weight, and fully stirs, and then standing 40-60min, then slowly be heated to 75-85 ℃ and fully stirring;
4) with step 2) water of product, step 3) product, silica flour, Ludox, ferric oxide red powder, fluorite powder, vermiculite power, colliery powder, residuals weight adds in reactor, open reactor, mixing speed is: 110-120r/min, add other raw material in stirring downhill reaction still, the temperature that heats simultaneously reactor slowly rises to 75-85 ℃, constant temperature stirs 14-18min, grinds, gets final product.
Utilize the suspensibility of coating placement after 42 hours of method preparation of the present invention greater than 94%; The shear stress of coating is limited to 19-22Pa; Be 42-45s with the apparent viscosity value that is coated with 4 viscometer determining coating, thixotroping rate 15-18%, the brushing index of coating, an amount of dropping down and a time of dropping down are respectively 5.8,0.6g and 9s.The normal temperature strength of coating is higher than 690g/mm.Through the intensity of paint coatings after 1200 ℃ of roastings higher than 490g/mm.The normal temperature gas permeability of coating is higher than 14cm 2(kPamin) -1, hot permeability is greater than 24cm 2(kPamin) -1

Claims (1)

1. a cast iron is with the preparation method of full-mold casting coating, it is characterized in that, formed by following component in weight portion: silica flour 65-75 part, trees ashes 5-7 part, schmigel 10-12 part, sodium bentonite 10-12 part, nano-attapulgite 4-6 part, lignin sulfonic acid 1-2 part, waterglass 2-4 part, Boratex 2-4 part, starch paste 5-7 part, Ludox 1.4-1.6 part, nanometer scale ceramics powder 1-2 part, ferric oxide red powder 0.5-0.8 part, fluorite powder 1-2 part, vermiculite power 3-4 part, colliery powder 1-2 part; Water 55-65 part, described preparation method comprises the steps:
1) the trees ashes were soaked 3-4 hour with 12-15% sulfuric acid, the deionized water washing, soaked 2-3 hour with the 10-12% sodium hydroxide solution again, extremely neutral with the deionized water washing again, then, add the starch paste, the NaOH powder of 7-9%, the suitable quantity of water that are equivalent to its weight 5-8% to mix rear pelletizing and be broken into modification trees ash particles after 2-3 hour in calcining under 460-500 ℃;
2) the modification trees ash particles that above-mentioned steps is obtained is mixed with the water of nano-attapulgite, 1/3 weight, and stirring is heated to 150-160 ℃, is incubated 1-2 hour, stove is chilled to 55 ℃, is incubated 1-2 hour, then is heated to 100-120 ℃, be incubated 1 hour, be cooled to normal temperature with 10 ℃/hour;
3) schmigel, sodium bentonite, nanometer scale ceramics powder, starch paste, the waterglass with above-mentioned weight portion mixes with the water of 1/4 weight, and fully stirs, and then standing 40-60min, then slowly be heated to 75-85 ℃ and fully stirring;
4) with step 2) water of product, step 3) product, silica flour, Ludox, ferric oxide red powder, fluorite powder, vermiculite power, colliery powder, residuals weight adds in reactor, open reactor, mixing speed is: 110-120r/min, add other raw material in stirring downhill reaction still, the temperature that heats simultaneously reactor slowly rises to 75-85 ℃, constant temperature stirs 14-18min, grinds, gets final product.
CN201210531084.2A 2012-12-11 2012-12-11 The preparation method of full-mold casting coating for a kind of cast iron Active CN103100658B (en)

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Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103394634A (en) * 2013-08-13 2013-11-20 赵溶 Environment-friendly water-based particle casting coating and preparation method thereof
CN104014720A (en) * 2014-05-09 2014-09-03 方学军 Quartz sand/fire clay composite alcohol group casting coating and preparation method thereof
CN104014723A (en) * 2014-05-09 2014-09-03 方学军 Expansible graphite alcohol-group casting coating and preparation method thereof
CN104014722A (en) * 2014-05-09 2014-09-03 方学军 Active carbon/kaolin composite alcohol-group casting coating and preparation method thereof
CN104084527A (en) * 2014-06-16 2014-10-08 芜湖市鸿坤汽车零部件有限公司 Alcohol-based foundry coating compounded by chromite/ expanded vermiculite and producing method thereof
CN104190860A (en) * 2014-06-26 2014-12-10 芜湖市鸿坤汽车零部件有限公司 Pyroclastic rock alcohol-based casting coating and manufacturing method thereof
CN104190859A (en) * 2014-06-26 2014-12-10 芜湖市鸿坤汽车零部件有限公司 Alcohol-based casting coating for lost foam casting and manufacturing method thereof
CN104399870A (en) * 2014-11-08 2015-03-11 芜湖市鸿坤汽车零部件有限公司 Novel alcohol-based casting paint containing tree ash and manufacturing method thereof
CN104475664A (en) * 2014-10-08 2015-04-01 铜陵瑞莱科技有限公司 Building gypsum/attapulgite composite casting coating and manufacturing method thereof
CN104475668A (en) * 2014-10-08 2015-04-01 铜陵瑞莱科技有限公司 Cristobalite/graphite composite casting coating and manufacturing method thereof
CN104475666A (en) * 2014-10-08 2015-04-01 铜陵瑞莱科技有限公司 High temperature resistant environmentally-friendly casting coating and manufacturing method thereof
CN104475671A (en) * 2014-10-08 2015-04-01 铜陵瑞莱科技有限公司 Quartz powder/expanded vermiculite composite casting coating and manufacturing method thereof
CN104475670A (en) * 2014-10-08 2015-04-01 铜陵瑞莱科技有限公司 Modified municipal sludge casting coating and manufacturing method thereof
CN104475667A (en) * 2014-10-08 2015-04-01 铜陵瑞莱科技有限公司 Zircon coating and manufacturing method thereof
CN105153896A (en) * 2015-09-14 2015-12-16 安徽华润涂料有限公司 Home security window prime paint and preparation method thereof
CN105328114A (en) * 2015-11-02 2016-02-17 广西博白县三田机械制造有限公司 Fire-proof coating used for die casting
CN105925041A (en) * 2016-07-19 2016-09-07 合肥鼎亮光学科技有限公司 Pressure-proof aqueous polyurethane luminescence and reflection road marking coating and preparation method thereof

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CN101569918A (en) * 2009-06-10 2009-11-04 刘则斌 Coating for lost foam cast iron
CN102397983A (en) * 2011-11-29 2012-04-04 朱小英 Full mold casing coating
CN102407275A (en) * 2011-04-25 2012-04-11 湖北工业大学 Expendable pattern casting (EPC) molding shell paint for casting steel and preparation method thereof

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WO2000001502A1 (en) * 1998-07-03 2000-01-13 Nippon Chuzo Kabushiki Kaisha Lost foam pattern casting method and fiber reinforced coating
CN101444826A (en) * 2007-11-27 2009-06-03 大连核心铸造技术工程研究所 Special coating for full mold casting
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Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103394634A (en) * 2013-08-13 2013-11-20 赵溶 Environment-friendly water-based particle casting coating and preparation method thereof
CN104014720A (en) * 2014-05-09 2014-09-03 方学军 Quartz sand/fire clay composite alcohol group casting coating and preparation method thereof
CN104014723A (en) * 2014-05-09 2014-09-03 方学军 Expansible graphite alcohol-group casting coating and preparation method thereof
CN104014722A (en) * 2014-05-09 2014-09-03 方学军 Active carbon/kaolin composite alcohol-group casting coating and preparation method thereof
CN104084527A (en) * 2014-06-16 2014-10-08 芜湖市鸿坤汽车零部件有限公司 Alcohol-based foundry coating compounded by chromite/ expanded vermiculite and producing method thereof
CN104190860A (en) * 2014-06-26 2014-12-10 芜湖市鸿坤汽车零部件有限公司 Pyroclastic rock alcohol-based casting coating and manufacturing method thereof
CN104190859A (en) * 2014-06-26 2014-12-10 芜湖市鸿坤汽车零部件有限公司 Alcohol-based casting coating for lost foam casting and manufacturing method thereof
CN104190860B (en) * 2014-06-26 2016-08-24 芜湖市鸿坤汽车零部件有限公司 A kind of pyroclastic rock alcohol-base foundry coating and preparation method thereof
CN104475668A (en) * 2014-10-08 2015-04-01 铜陵瑞莱科技有限公司 Cristobalite/graphite composite casting coating and manufacturing method thereof
CN104475664A (en) * 2014-10-08 2015-04-01 铜陵瑞莱科技有限公司 Building gypsum/attapulgite composite casting coating and manufacturing method thereof
CN104475666A (en) * 2014-10-08 2015-04-01 铜陵瑞莱科技有限公司 High temperature resistant environmentally-friendly casting coating and manufacturing method thereof
CN104475671A (en) * 2014-10-08 2015-04-01 铜陵瑞莱科技有限公司 Quartz powder/expanded vermiculite composite casting coating and manufacturing method thereof
CN104475670A (en) * 2014-10-08 2015-04-01 铜陵瑞莱科技有限公司 Modified municipal sludge casting coating and manufacturing method thereof
CN104475667A (en) * 2014-10-08 2015-04-01 铜陵瑞莱科技有限公司 Zircon coating and manufacturing method thereof
CN104399870A (en) * 2014-11-08 2015-03-11 芜湖市鸿坤汽车零部件有限公司 Novel alcohol-based casting paint containing tree ash and manufacturing method thereof
CN105153896A (en) * 2015-09-14 2015-12-16 安徽华润涂料有限公司 Home security window prime paint and preparation method thereof
CN105328114A (en) * 2015-11-02 2016-02-17 广西博白县三田机械制造有限公司 Fire-proof coating used for die casting
CN105925041A (en) * 2016-07-19 2016-09-07 合肥鼎亮光学科技有限公司 Pressure-proof aqueous polyurethane luminescence and reflection road marking coating and preparation method thereof

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