CN103394632B - Alcohol-based white coating for sand mold cast iron, and preparation method thereof - Google Patents
Alcohol-based white coating for sand mold cast iron, and preparation method thereof Download PDFInfo
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- CN103394632B CN103394632B CN201310330903.1A CN201310330903A CN103394632B CN 103394632 B CN103394632 B CN 103394632B CN 201310330903 A CN201310330903 A CN 201310330903A CN 103394632 B CN103394632 B CN 103394632B
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Abstract
The invention discloses an alcohol-based white coating for a sand mold cast iron, and a preparation method thereof. The alcohol-based white coating for the sand mold cast iron comprises the following components by weight: 50-60 parts of pyrophyllite powder, 22-28 parts of calcined kaolin powder, 14-18 parts of wollastonite powder, 3-5 parts of potassium feldspar powder, 8-12 parts of calcium based rectorite powder, 3-5 parts of sodium tripolyphosphate, 4-6 parts of a thermosetting phenolic resin, 0.5-0.8 part of polyvinyl butyral, 6-10 parts of water and 60-70 parts of methanol. The alcohol-based white coating for the sand mold cast iron can replace an alcohol-based graphite coating for use in production of various sand mold cast iron members, can increase surface clearness of the cast iron members, and eliminates black pollutions to the environment caused by using the graphite coating in the production of the cast iron.
Description
Technical field
The invention belongs to cast iron Modeling Material field, relate to a kind of sand mold cast iron alcohol radical whitewash and preparation method thereof.
Background technology
In sand mold iron casting production, in order to obtain bright and clean ironcasting, must brushing graphite-like coating or graphite-alumino-silicate compound light-coloured coating at mould surface.Graphite has very high fusing point (> 3000 DEG C), and equadag coating is not soaked by molten iron, avoids molten iron permeation coating or sand mold space, prevents ironcasting to produce scab defect.Previous research shows, except graphite-like coating, zircon flour coating, for the production of ironcasting, also has reasonable Sand sticking-resistant effect.And other Aluminosilicates coating, as silica flour wash, schmigel coating, aluminium vanadine coating etc., all can be soaked by molten iron, molten iron easily infiltrates coating refractory aggregate particulate interspaces, makes dope layer tightly stick to cast(ing) surface, cannot remove, and forms sticky powder defect.Because zircon flour coating is expensive, cost cannot be competed mutually with graphite-like coating, in Cast Iron Production, rarely have application.Therefore, the iron casting coating for iron casting production is graphite-like coating substantially.Different according to coating used carrier, cast iron mo(u)ld blacking can divide two large classes, and a class is alcohol radical iron casting coating, and another kind of is water based iron casting paint.Because alcohol radical iron casting coating is easy and simple to handle, production efficiency is high, and current cast iron coating, based on alcohol radical graphite-like coating, accounts for more than 90% of whole graphite-like coating.Although graphite-like coating has reasonable effect in Cast Iron Production, the superfine graphite black powder in coating easily sticks to Iron Casting Surface, and extremely difficult removing, reduces its cleannes; Fly away in atmosphere, cause black pollution to environment, its use is more and more restricted.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of sand mold cast iron alcohol radical whitewash, can not only prevent ironcasting from producing scab, sticky powder defect with it, improve the surface cleanness of ironcasting, and the problem of the black powder contaminated environment that graphite-like coating in current Cast Iron Production causes can also be solved.Present invention also offers the preparation method of this coating.
A kind of sand mold cast iron alcohol radical whitewash, its component and weight portion are:
Pyrophyllite in powder 50 ~ 60 parts;
22 ~ 28 parts, calcined kaolin powder;
Wollastonite in powder 14 ~ 18 parts;
Feldspar in powder 3 ~ 5 parts;
Calcium base rectorite 8 ~ 12 parts;
Sodium phosphate trimer 3 ~ 5 parts;
Thermosetting phenolic resin 4 ~ 6 parts;
Polyvinyl butyral resin 0.5 ~ 0.8 part;
6 ~ 10 parts, water;
Methyl alcohol 60 ~ 70 parts.
Described pyrophyllite in powder, granularity is 325 ~ 400 orders, wherein Al
2o
3mass content is 18 ~ 20%, SiO
2mass content is 68 ~ 72%.
Described calcined kaolin powder, granularity is 1260 ~ 1500 orders, wherein SiO
2mass content is 50 ~ 54%, Al
2o
3mass content is 28 ~ 32%.
Described wollastonite in powder, granularity is 600 ~ 800 orders, wherein SiO
2mass content is 45 ~ 55%, CaO mass content is 38 ~ 45%.
Described feldspar in powder, granularity is 800 ~ 1200 orders, wherein SiO
2mass content is 65 ~ 72%, Al
2o
3mass content is 13 ~ 17%, K
2o mass content is 8 ~ 10%, Na
2o mass content is 1.8 ~ 2.8%.
Described calcium base rectorite, its performance indications are: colloid index >=60mL/15g, swell value >=10mL/3g.
Described thermosetting phenolic resin, its free phenol≤12%, solid content >=80%, viscosity is 600 ~ 1000s.
Described polyvinyl butyral resin, aldehyde radical is 78 ~ 86%, and hydroxyl is 15 ~ 18%, and viscosity is 25 ~ 40 cps.
Methanol purity used is less demanding, and reaching 95wt% can meet quality requirement.
The preparation method of above-mentioned sand mold cast iron alcohol radical whitewash, comprises the steps:
A) water of 6 ~ 10 weight portions is heated to 100 DEG C, add the sodium phosphate trimer of 3 ~ 5 weight portions in the hot water again and be dissolved into transparence, then adding the calcium base rectorite powder of 8 ~ 12 weight portions, stirring, pour in colloid mill and grind 10 ~ 15min, make creme A;
B) by the polyvinyl butyral resin of 0.5 ~ 0.8 weight portion, mix with the methyl alcohol of 8 ~ 11 weight portions, and be dissolved into pellucidity, then add the thermosetting phenolic resin of 4 ~ 6 weight portions, stir, make sol B;
C) methyl alcohol of creme A, sol B, 22 ~ 25 weight portions is poured in mould wash mixer, first stir, again by the calcined kaolin powder of the pyrophyllite in powder of 50 ~ 60 weight portions, 22 ~ 28 weight portions, the wollastonite in powder of 14 ~ 18 weight portions, the feldspar in powder of 3 ~ 5 weight portions adds in mixer, stirs into thick shape coating plaster C;
D) pour in colloid mill by thick shape coating plaster C, grinding 10 ~ 15 min dischargings, pour mixer into, then add the methyl alcohol of 25 ~ 27 weight portions, stir into rare cream pulpous state, then add methyl alcohol 5 ~ 7 weight portion, and adjustment coating density is to 1.35 ~ 1.50g/cm
3.
Sand mold cast iron alcohol radical whitewash of the present invention, belong to non-graphite composite fire aggregate coating, the color of the pulverulent materials such as the refractory aggregate used in coating, suspending agent is white or lime look, can not cause black pollution.Substitute alcohol radical graphite-like coating with it, for sand mold iron casting production, can not only prevent ironcasting from producing scab, sticky powder defect, obtain the ironcasting cleaned, the problem of powdered graphite black pollution environment in current iron casting production can also be solved.In addition, this sand mold cast iron alcohol radical whitewash methanol purity used is less demanding, and reaching 95% can meet quality requirement, and this has realistic meaning to the manufacture and usage cost reducing this coating.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is further described.
Embodiment 1: sand mold cast iron alcohol radical whitewash makes one
1) water of 6 weight portions is heated to 100 DEG C, add the sodium phosphate trimer of 3 weight portions in the hot water again and be dissolved into transparence, (its performance indications are: colloid index >=60mL/15g to add the calcium base rectorite powder of 8 weight portions again, swell value >=10mL/3g), stir, pour in colloid mill and grind 10min, make creme A.
2) by the polyvinyl butyral resin of 0.5 weight portion, (aldehyde radical is 78 ~ 86%, hydroxyl is 15 ~ 18%, viscosity is 25 ~ 40 cps), mix with the methyl alcohol of 8 weight portions, and be dissolved into pellucidity, then add thermosetting phenolic resin (its free phenol≤12% of 4 weight portions, solid content >=80%, viscosity is 600 ~ 1000s), stir, make sol B.
3) methyl alcohol of creme A, sol B, 22 weight portions is poured in mould wash mixer, first stir, then (granularity is 325 ~ 400 orders, wherein Al by the pyrophyllite in powder of 50 weight portions
2o
3mass content is 18 ~ 20%, SiO
2mass content is 68 ~ 72%), (granularity is 1260 ~ 1500 orders, wherein SiO for the calcined kaolin powder of 22 weight portions
2mass content is 50 ~ 54%, Al
2o
3mass content is 28 ~ 32%), (granularity is 600 ~ 800 orders, wherein SiO to the wollastonite in powder of 14 weight portions
2mass content is 45 ~ 55%, CaO mass content is 38 ~ 45%), (granularity is 800 ~ 1200 orders, wherein SiO to the feldspar in powder of 3 weight portions
2mass content is 65 ~ 72%, Al
2o
3mass content is 13 ~ 17%, K
2o mass content is 8 ~ 10%, Na
2o mass content is 1.8 ~ 2.8%) add (rotating speed 100r/min) in low-speed mixer, stir into thick shape coating plaster C.
4) pour in colloid mill by thick shape coating plaster C, grind 10 min dischargings, pour homogenizer (rotating speed 800r/min) into, then add the methyl alcohol of 25 weight portions, stir into rare cream pulpous state, then add methyl alcohol 5 ~ 7 weight portion, adjustment coating density is to 1.35 ~ 1.50g/cm
3.
Embodiment 2: sand mold cast iron alcohol radical whitewash makes two
1) water of 8 weight portions is heated to 100 DEG C, add the sodium phosphate trimer of 4 weight portions in the hot water again and be dissolved into transparence, (its performance indications are: colloid index >=60mL/15g to add the calcium base rectorite powder of 10 weight portions again, swell value >=10mL/3g), stir, pour in colloid mill and grind 12min, make creme A.
2) by the polyvinyl butyral resin of 0.6 weight portion, (aldehyde radical is 78 ~ 86%, hydroxyl is 15 ~ 18%, viscosity is 25 ~ 40 cps), mix with the methyl alcohol of 10 weight portions, and be dissolved into pellucidity, then add thermosetting phenolic resin (its free phenol≤12% of 5 weight portions, solid content >=80%, viscosity is 600 ~ 1000s), stir, make sol B.
3) methyl alcohol of creme A, sol B, 23 weight portions is poured in mould wash mixer, first stir, then (granularity is 325 ~ 400 orders, wherein Al by the pyrophyllite in powder of 55 weight portions
2o
3mass content is 18 ~ 20%, SiO
2mass content is 68 ~ 72%), (granularity is 1260 ~ 1500 orders, wherein SiO for the calcined kaolin powder of 25 weight portions
2mass content is 50 ~ 54%, Al
2o
3mass content is 28 ~ 32%), (granularity is 600 ~ 800 orders, wherein SiO to the wollastonite in powder of 16 weight portions
2mass content is 45 ~ 55%, CaO mass content is 38 ~ 45%), (granularity is 800 ~ 1200 orders, wherein SiO to the feldspar in powder of 4 weight portions
2mass content is 65 ~ 72%, Al
2o
3mass content is 13 ~ 17%, K
2o mass content is 8 ~ 10%, Na
2o mass content is 1.8 ~ 2.8%) add (rotating speed 100r/min) in low-speed mixer, stir into thick shape coating plaster C.
4) thick shape coating plaster C is poured in colloid mill, grind 13 min dischargings, pour homogenizer (rotating speed 1000r/min) into, add the methyl alcohol of 26 weight portions again, stir into rare cream pulpous state, then add methyl alcohol 5 ~ 7 weight portion, adjustment coating density is to 1.35 ~ 1.50g/cm
3.
Embodiment 3: sand mold cast iron alcohol radical whitewash makes three
1) water of 10 weight portions is heated to 100 DEG C, add the sodium phosphate trimer of 5 weight portions in the hot water again and be dissolved into transparence, (its performance indications are: colloid index >=60mL/15g to add the calcium base rectorite powder of 12 weight portions again, swell value >=10mL/3g), stir, pour in colloid mill and grind 15min, make creme A.
2) by the polyvinyl butyral resin of 0.8 weight portion, (aldehyde radical is 78 ~ 86%, hydroxyl is 15 ~ 18%, viscosity is 25 ~ 40 cps), mix with the methyl alcohol of 11 weight portions, and be dissolved into pellucidity, then add thermosetting phenolic resin (its free phenol≤12% of 6 weight portions, solid content >=80%, viscosity is 600 ~ 1000s), stir, make sol B.
3) methyl alcohol of creme A, sol B, 25 weight portions is poured in mould wash mixer, first stir, then (granularity is 325 ~ 400 orders, wherein Al by the pyrophyllite in powder of 60 weight portions
2o
3mass content is 18 ~ 20%, SiO
2mass content is 68 ~ 72%), (granularity is 1260 ~ 1500 orders, wherein SiO for the calcined kaolin powder of 28 weight portions
2mass content is 50 ~ 54%, Al
2o
3mass content is 28 ~ 32%), (granularity is 600 ~ 800 orders, wherein SiO to the wollastonite in powder of 18 weight portions
2mass content is 45 ~ 55%, CaO mass content is 38 ~ 45%), (granularity is 800 ~ 1200 orders, wherein SiO to the feldspar in powder of 5 weight portions
2mass content is 65 ~ 72%, Al
2o
3mass content is 13 ~ 17%, K
2o mass content is 8 ~ 10%, Na
2o mass content is 1.8 ~ 2.8%) add (rotating speed 100r/min) in low-speed mixer, stir into thick shape coating plaster C.
4) pour in colloid mill by thick shape coating plaster C, grind 15 min dischargings, pour homogenizer (rotating speed 900r/min) into, then add the methyl alcohol of 27 weight portions, stir into rare cream pulpous state, then add methyl alcohol 5 ~ 7 weight portion, adjustment coating density is to 1.35 ~ 1.50g/cm
3.
Embodiment 1 ~ 3 gained coating is at 1.35 ~ 1.50g/cm
3painting brush density under, its technical indicator is as table 1.
The technical indicator of table 1 embodiment 1 ~ 3 gained coating
The Sand sticking-resistant design principle of sand mold cast iron alcohol radical whitewash of the present invention is: pyrophyllite powder has laminated structure or soapy feeling, experiment finds, pyrophillite not by molten iron complete wetting, and has higher refractoriness, similar to graphite powder, in coating, make main aggregate; Calcined kaolin refractoriness is high, Stability Analysis of Structures, Ultra-fine, has and well covers and penetrating power, fill sand mold space, plays the effect of setting up Sand sticking-resistant separation layer in sand mold inside; Containing a large amount of calcium oxide (CaO) in wollastonite, calcium oxide is not soaked by molten iron, and can form a small amount of low melting point thickness phase with pyrophillite, calcined kaolin, fills up coating space, forms sealant, prevents molten iron from permeating sand mold; Add a small amount of feldspar in powder in coating, strengthen coating sintering further.
Have employed calcium base rectorite powder in coating and make suspending agent, it is high that calcium base rectorite has suspension stability, refractoriness high, in addition, maximum advantage is under molten iron high temperature action, and the not shrinkage cracking substantially of the calcium base rectorite in coating, ensure that the heat endurance of coating.
In coating, thermosetting phenolic resin just can form molten not insoluble three-dimensional-structure in coating igniting dry run, makes dope layer have normal temperature strength, prevents dope layer dry linting, peeling; Sodium phosphate trimer is the high-temperature agglomerant that unshape refractory is conventional, and under the pouring temperature of molten iron, it can sinter ceramic of compact structure into refractory aggregate, molding sand in coating, prevents dope layer from coming off or peels off.
Claims (2)
1. a sand mold cast iron alcohol radical whitewash, its component and weight portion are:
Pyrophyllite in powder 50 ~ 60 parts;
22 ~ 28 parts, calcined kaolin powder;
Wollastonite in powder 14 ~ 18 parts;
Feldspar in powder 3 ~ 5 parts;
Calcium base rectorite 8 ~ 12 parts;
Sodium phosphate trimer 3 ~ 5 parts;
Thermosetting phenolic resin 4 ~ 6 parts;
Polyvinyl butyral resin 0.5 ~ 0.8 part;
6 ~ 10 parts, water;
Methyl alcohol 60 ~ 70 parts;
Described pyrophyllite in powder, granularity is 325 ~ 400 orders, wherein Al
2o
3mass content is 18 ~ 20%, SiO
2mass content is 68 ~ 72%;
Described calcined kaolin powder, granularity is 1260 ~ 1500 orders, wherein SiO
2mass content is 50 ~ 54%, Al
2o
3mass content is 28 ~ 32%;
Described wollastonite in powder, granularity is 600 ~ 800 orders, wherein SiO
2mass content is 45 ~ 55%, CaO mass content is 38 ~ 45%;
Described feldspar in powder, granularity is 800 ~ 1200 orders, wherein SiO
2mass content is 65 ~ 72%, Al
2o
3mass content is 13 ~ 17%, K
2o mass content is 8 ~ 10%, Na
2o mass content is 1.8 ~ 2.8%;
Described calcium base rectorite, its performance indications are: colloid index >=60mL/15g, swell value >=10mL/3g;
Described thermosetting phenolic resin, its free phenol≤12%, solid content >=80%, viscosity is 600 ~ 1000s;
Described polyvinyl butyral resin, aldehyde radical is 78 ~ 86%, and hydroxyl is 15 ~ 18%, and viscosity is 25 ~ 40 cps;
Methanol purity used is higher than 95wt%.
2. the preparation method of sand mold cast iron alcohol radical whitewash according to claim 1, is characterized in that comprising the steps:
A) water of 6 ~ 10 weight portions is heated to 100 DEG C, add the sodium phosphate trimer of 3 ~ 5 weight portions in the hot water again and be dissolved into transparence, then adding the calcium base rectorite powder of 8 ~ 12 weight portions, stirring, pour in colloid mill and grind 10 ~ 15min, make creme A;
B) by the polyvinyl butyral resin of 0.5 ~ 0.8 weight portion, mix with the methyl alcohol of 8 ~ 11 weight portions, and be dissolved into pellucidity, then add the thermosetting phenolic resin of 4 ~ 6 weight portions, stir, make sol B;
C) methyl alcohol of creme A, sol B, 22 ~ 25 weight portions is poured in mould wash mixer, first stir, again the wollastonite in powder of the calcined kaolin powder of the pyrophyllite in powder of 50 ~ 60 weight portions, 22 ~ 28 weight portions, 14 ~ 18 weight portions, the feldspar in powder of 3 ~ 5 weight portions are added in mixer, stir into thick shape coating plaster C;
D) pour in colloid mill by thick shape coating plaster C, grinding 10 ~ 15 min dischargings, pour mixer into, then add the methyl alcohol of 25 ~ 27 weight portions, stir into rare cream pulpous state, then add methyl alcohol 5 ~ 7 weight portion, and adjustment coating density is to 1.35 ~ 1.50g/cm
3.
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| 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 |
| CN105602363A (en) * | 2015-12-30 | 2016-05-25 | 辛范范 | Durable outer wall paint and preparing method thereof |
| CN106270373B (en) * | 2016-09-27 | 2018-06-29 | 湖北工业大学 | A kind of precoated sand sand mold alcohol-base foundry coating and preparation method thereof |
| CN106513570A (en) * | 2016-10-10 | 2017-03-22 | 佛山市高明区明城镇新能源新材料产业技术创新中心 | Casting coating and preparation method thereof |
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| JPS55149747A (en) * | 1979-05-12 | 1980-11-21 | Sogo Imono Center | Preventing method for defect of spheroidal graphite cast iron casting |
| JPS58209443A (en) * | 1982-05-31 | 1983-12-06 | Izumi Jidosha Kogyo Kk | Cast iron piston and its production |
| CN1478621A (en) * | 2003-06-05 | 2004-03-03 | 湖北工学院 | Alcoholic and aqueous series chromium iron ore sand powder anti percolation sticky sand casting paint |
| CN101642796B (en) * | 2009-08-28 | 2011-09-28 | 深圳市景鼎现代科技有限公司 | Formula and preparation process of alcohol group nanometer composite and surface modified dry powder mold paint |
| CN101817058A (en) * | 2010-03-30 | 2010-09-01 | 深圳市景鼎现代科技有限公司 | Shield type coating composition and preparation process of coating thereof |
| 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 |
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