CN103100658B - The preparation method of full-mold casting coating for a kind of cast iron - Google Patents
The preparation method of full-mold casting coating for a kind of cast iron Download PDFInfo
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- CN103100658B CN103100658B CN201210531084.2A CN201210531084A CN103100658B CN 103100658 B CN103100658 B CN 103100658B CN 201210531084 A CN201210531084 A CN 201210531084A CN 103100658 B CN103100658 B CN 103100658B
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Abstract
The preparation method who the invention discloses a kind of cast iron full-mold casting coating, is made up of 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, water 525-535 part. Coating of the present invention all has quick-drying, good gas permeability and drip-dry full-mold casting coating under high temperature, low temperature environment, can meet heavy castings production requirement.
Description
Technical field
The present invention relates to casting field, particularly the preparation method of full-mold casting coating for a kind of cast iron.
Background technology
The disperse system that full-mold casting coating is made up 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 have good processing performance, service behaviour, quality stability and apply reappearance. Full-mold casting coating is coated in the outer surface of foamed polystyrene pattern, could moulding cast after coating is dry. Foamed plastics is airtight, and heat distortion temperature low (approximately 70 DEG C 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 be discharged in time, foundry goods will produce the carbon defects such as gas, carburetting, Surface Wrinkle in iron. These features have determined that full-mold paint should possess following performance requirement, and 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 poor, can only be applicable 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 object of this invention is to provide the preparation method of a kind of cast iron full-mold casting coating, under high temperature, low temperature environment, all there is quick-drying, quick-drying, good gas permeability and drip-dry full-mold casting coating, can meet heavy castings production requirement.
Technical scheme of the present invention is as follows:
A preparation method for full-mold casting coating for cast iron, is made up of 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) trees ashes are soaked to 3-4 hour with 12-15% sulfuric acid, deionized water washing, soak 2-3 hour with 10-12% sodium hydroxide solution again, extremely neutral with deionized water washing again, then at 460-500 DEG C, calcine after 2-3 hour, add the starch paste, the NaOH powder of 7-9%, the rear pelletizing of suitable quantity of water mixing that are equivalent to its weight 5-8% to be broken into modification trees ash particles;
2) modification trees ash particles above-mentioned steps being obtained is mixed with the water of nano-attapulgite, 1/3 weight, stir and be heated to 150-160 DEG C, insulation 1-2 hour, stove is chilled to 55 DEG C, insulation 1-2 hour, be heated to again 100-120 DEG C, be incubated 1 hour, be cooled to normal temperature with 10 DEG C/h;
3) schmigel of above-mentioned weight portion, sodium bentonite, nanometer scale ceramics powder, starch paste, waterglass are mixed with the water of 1/4 weight, and fully stir, then leave standstill 40-60min, be then slowly heated to 75-85 DEG C and fully stirring;
4) by 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, in stirring downhill reaction still, add other raw material, heat simultaneously the temperature of reactor is slowly risen to 75-85 DEG C, constant temperature stirs 14-18min, grind.
Compared with prior art, the present invention has following beneficial effect:
1) on the basis of great many of experiments, determine the composition of aggregate, nano-attapulgite, bonding agent and auxiliary material of coating and content separately, 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. Through the optimization allotment of aggregate and various additives, form high current sex change fluid, all reach 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 meet 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. Bright and clean with the full mold cast(ing) surface of its production, without carbon defects such as elephant skin; Coating is easy to peel off, and is convenient to cleaning.
Detailed description of the invention
The preparation method of full-mold casting coating for cast iron, in weight portion (kilogram) formed by following component: 75 parts of silica flours, 7 parts, trees ashes, 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, preparation method comprises the steps:
1) trees ashes are soaked to 3-4 hour with 12-15% sulfuric acid, deionized water washing, soak 2-3 hour with 10-12% sodium hydroxide solution again, extremely neutral with deionized water washing again, then at 460-500 DEG C, calcine after 2-3 hour, add the starch paste, 9% NaOH powder, the suitable quantity of water that are equivalent to its weight 8% to mix after pelletizing be broken into modification trees ash particles;
2) modification trees ash particles above-mentioned steps being obtained is mixed with the water of nano-attapulgite, 1/3 weight, stir and be heated to 150-160 DEG C, insulation 1-2 hour, stove is chilled to 55 DEG C, insulation 1-2 hour, be heated to again 100-120 DEG C, be incubated 1 hour, be cooled to normal temperature with 10 DEG C/h;
3) schmigel of above-mentioned weight portion, sodium bentonite, nanometer scale ceramics powder, starch paste, waterglass are mixed with the water of 1/4 weight, and fully stir, then leave standstill 40-60min, be then slowly heated to 75-85 DEG C and fully stirring;
4) by 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, in stirring downhill reaction still, add other raw material, heat simultaneously the temperature of reactor is slowly risen to 75-85 DEG C, constant temperature stirs 14-18min, grind.
Utilize the suspensibility that coating prepared by method of the present invention was placed after 42 hours to be greater than 94%; The shear stress of coating is limited to 19-22Pa; Be 42-45s with being coated with the apparent viscosity value of 4 viscometer determining coating, thixotroping rate 15-18%, the brushing index of coating, drips the amount of dropping down and drips the time of dropping down and be respectively 5.8,0.6g and 9s. The normal temperature strength of coating is higher than 690g/mm. After 1200 DEG C of roastings, the intensity of paint coatings is higher than 490g/mm. The normal temperature gas permeability of coating is higher than 14cm2·（kPa·min）-1, hot permeability is greater than 24cm2·（kPa·min）-1。
Claims (1)
1. a preparation method for full-mold casting coating for cast iron, is characterized in that, is made up of: silica flour 65-75 part in weight portion following component, 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) trees ashes are soaked to 3-4 hour with the sulfuric acid of 12-15%, deionized water washing, soak 2-3 hour with 10-12% sodium hydroxide solution again, extremely neutral with deionized water washing again, then at 460-500 DEG C, calcine after 2-3 hour, add the starch paste, the NaOH powder of 7-9%, the rear pelletizing of suitable quantity of water mixing that are equivalent to its weight 5-8% to be broken into modification trees ash particles;
2) modification trees ash particles above-mentioned steps being obtained is mixed with the water of nano-attapulgite, 1/3 weight, stir and be heated to 150-160 DEG C, insulation 1-2 hour, stove is chilled to 55 DEG C, insulation 1-2 hour, be heated to again 100-120 DEG C, be incubated 1 hour, be cooled to normal temperature with 10 DEG C/h;
3) starch paste of the schmigel of above-mentioned weight portion, sodium bentonite, nanometer scale ceramics powder, waterglass and remaining weight portion is mixed with the water of 1/4 weight, and fully stir, then leave standstill 40-60min, be then slowly heated to 75-85 DEG C and fully stirring;
4) by 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, in stirring downhill reaction still, add other raw material, heat simultaneously the temperature of reactor is slowly risen to 75-85 DEG C, constant temperature stirs 14-18min, grind.
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| US5950702A (en) * | 1997-04-11 | 1999-09-14 | Ashland Inc. | Consumable pattern coating for lost foam castings |
| JP3336260B2 (en) * | 1998-07-03 | 2002-10-21 | 日本鋳造株式会社 | Vanishing model casting |
| 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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| CN101569918B (en) * | 2009-06-10 | 2010-12-01 | 刘则斌 | Coating for lost foam cast iron |
| CN102407275B (en) * | 2011-04-25 | 2013-04-10 | 湖北工业大学 | Expendable pattern casting (EPC) molding shell paint for casting steel and preparation method thereof |
| CN102397983B (en) * | 2011-11-29 | 2013-03-20 | 宁波兴柯汽车新材料科技有限公司 | Full mold casing coating |
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Effective date of registration: 20180702 Address after: 441700 Gucheng Economic Development Zone, Xiangyang, Hubei Patentee after: Xiangyang jinnaite mechanical Limited by Share Ltd Address before: 241007 5 Yang Tian Road, Jiujiang Economic Development Zone, Wuhu, Anhui Patentee before: Wuhu Hengkun Auto Parts Co., Ltd. |