CN103551495B - A kind of high temperature resistant mould wash and preparation method thereof - Google Patents
A kind of high temperature resistant mould wash and preparation method thereof Download PDFInfo
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- CN103551495B CN103551495B CN201310487080.3A CN201310487080A CN103551495B CN 103551495 B CN103551495 B CN 103551495B CN 201310487080 A CN201310487080 A CN 201310487080A CN 103551495 B CN103551495 B CN 103551495B
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Abstract
The invention discloses a kind of high temperature resistant mould wash, adopt alkaline silica sol, graphite powder, dispersant to obtain in the ratio of 100:5 ~ 20:0.1 ~ 1; The SiO of described alkaline silica sol
2content is 20 ~ 40%; The granularity of described graphite powder is 30 ~ 100 orders.The present invention can reduce its adhesive greatly by adding graphite powder in alkaline silica sol, and the coating protection thickness obtained after brushing is even, flat smooth, and bottom side can be protected; And consumption is few, only need sprays thin layer, just can form firm diaphragm, in addition because graphite powder mixes with Ludox, the graphite powder formed after protective layer is dispersed in Ludox, can not be distributed to inside ingot, affect product quality.
Description
Technical field
The present invention relates to a kind of high-temperature resistant coating, be specifically related to one and ingot mould withstanding high temperatures can be protected to wash away, not by the coating of high temperature erosion.
Background technology
High-temperature coatings generally refers to the temperature bearing more than 200 DEG C for a long time, and can keep certain physical and chemical performance, makes the specific functionality coating that protected object can normally play a role in hot environment.Coating, as a kind of protective material, is widely used in machinery, electric, the fields such as space flight and aviation, chemical industry, building.
Along with the expansion of coatings art, some conventional coatings can not meet new instructions for use gradually, wherein just comprise the heat resistance of coating.Most coatings that we use all belong to organic coating, and its serviceability temperature is limited in slightly higher temperature mostly, is generally no more than 250 DEG C.To higher temperature can be born, generally inorganic coating will be considered.
Must experience the operation of moulding by casting in ferroalloy/metallic silicon production process, high-temperature liquid in ladle is known from experience and is introduced in cast steel ingot mould, then cooled and solidified gradually, is poured out by ferroalloy/metal silico briquette finally by toppling over.For protection cast steel ingot mould is not corroded by the high-temp liquid of 1500 DEG C, usually need in ingot mould, form interlayer and liquid is not directly contacted with ingot mould.
Summary of the invention
In production in the past, the interlayer material usually adopted is graphite powder or silico briquette/powder, by being sprinkling upon in ingot mould graphite powder or silico briquette/powder to form interlayer.But it exists more shortcoming: 1. graphite powder thickness is uneven, and ingot mould side is difficult to form protection; 2. graphite bisque is too thin is difficult to play available protecting to ingot mould, and the consumption having spread graphite powder thick is bigger than normal again, and cost is higher; 3. graphite powder and ingot mould do not have bonding, and the scouring force formed when high-temp liquid starts to build is easy to graphite powder to wash open, thus damage ingot mould; 4. graphite powder density is little, and the liquid-tight degree of ferroalloy liquid/silicon is large, and part graphite powder can float and diffuses in liquid, has stayed in ingot casting after cooling, has increased the content of carbon impurity; When 5. adopting silico briquette/powder, silico briquette/the powder of different batches is as interlayer, and combining together by silico briquette/powder after pouring the melting liquid cools in ingot mould into, is bring more impurity in melting liquid, and because some silicon needs are as interlayer circulation, reduce the service efficiency of ingot mould.The object of the invention is for above problem, a kind of high temperature resistant mould wash is provided, high temperature iron aluminium alloy/silicon liquid can be overcome to the erosion of ingot mould, extend ingot mould service life, and make ingot casting be easy to the demoulding, surfacing.
The invention provides a kind of high temperature resistant mould wash, the following raw material by by weight: alkaline silica sol, graphite powder, dispersant obtain in the ratio of 100:5 ~ 20:0.1 ~ 1.
The SiO of described alkaline silica sol
2content is 20 ~ 40%.
In preferred scheme, the SiO of the alkaline silica sol adopted
2content is 30%.
The granularity of described graphite powder is 30 ~ 100 orders.Graphite powder order number disperses bad time too low, easily deposit; When order number is too high, price is high and not easily mix
Described dispersant is silicates dispersant, as sodium metasilicate, potassium silicate etc.; Add dispersant and be conducive to alkaline silica sol and graphite powder mixes, keep dispersion relatively stable, wherein sodium metasilicate because of its price material benefit the most conventional.
In preferred formula, described coating adopts SiO
2content be 30% alkaline silica sol, 100 order graphite powders, waterglass by weight 100:8 ~ 10:0.5 ratio obtain.Verified by a large amount of tests, the program is optimum proportioning, and the dope viscosity obtained is moderate, is easy to spraying or brushes, and buying preparation is convenient.The ratio of alkaline silica sol and graphite powder is mainly according to the principle that dope viscosity is applicable to: if alkaline silica sol concentration is low, then graphite powder consumption can improve, otherwise when spraying sidewall, moisture evaporation rate is unable to catch up with the speed that coating trickles downwards, causes coating heterogeneity; But alkaline silica sol concentration is high, graphite powder dispersiveness reduces, and silicon liquid and its adhesive increase, and spraying is inconvenient.
Alkaline silica sol, graphite powder, dispersant are proportionally mixed, after stirring, high temperature resistant mould wash can be obtained.
When Ludox moisture evaporates, colloidal particle can be attached to body surface securely, and forming silicon oxygen bond between particle and combine, is good adhesive and additive.Acidic silicasol is in metastable condition, gradually gelatification can occur in put procedure, and especially the trend of high-concentration silicon sol is more obvious, and the stability of alkaline silica sol is higher; Acidic silicasol contains hydrogen ion in addition, with cast steel, some can occur and react, thus slowly corrode ingot mould.Thus in this coating, select alkaline silica sol as raw material.
Use because Ludox can be used as bonding agent, be low viscous colloidal solution, good dispersion, fully can immerse and be filled to ingot mould inwall, make its surface smoothing, and form firm film after dewatering.Simple use Ludox is infeasible as high-temperature coatings, because the silicon liquid of melting and SiO
2meeting adhesion, and the present invention can reduce its adhesive greatly by adding graphite powder in alkaline silica sol.
When using this coating, high-temperature resistant coating sprayed or brushes after ingot mould inwall, the moisture evaporation in coating, thus forming fine and close smooth protective layer.In the continuous prodution of reality, after the cast ingot product demoulding, ingot mould remains awfully hot, and after high-temperature coatings spraying or brushing above, in coating, moisture evaporation is exceedingly fast, and evaporates after the usual several seconds with regard to basic, formation protective layer.About the thickness of coating, because silicon water is when pouring into ingot mould at the beginning, to there being larger scouring force bottom ingot mould.If coating layer thickness is too thin, then may by silicon water by base coat erosion damage, especially the water is just on the boil begins that point of contact ingot mould for silicon.Therefore, the coating layer thickness bottom ingot mould should be too not thin, the height of toppling over according to silicon bag, about 1-2mm.
High-temperature resistant coating provided by the invention also has following beneficial effect:
1) adopt the coating thickness after this spray painting or brushing even, flat smooth, bottom side can be protected;
2) only need spray thin layer, just can form firm diaphragm, consumption is low, and cost is low;
3) because graphite powder mixes with Ludox, the graphite powder formed after protective layer is dispersed in Ludox, so can not be distributed to inside ingot, affects product quality.
This kind of coating formula is developed when silicon water damages large to ingot mould when casting for metallic silicon smelting, it is with strong points and preparation is simple, when not this coating, silicon water is to also bringing in silicon by the metal impurities of ingot mould while ingot mould damage, makes impurity content increase.Only need allow when preparing this coating to have one deck can resistant to elevated temperatures interlayer and little to the pollution of silicon water between cast steel ingot mould and silicon water, after not requiring the silicon ingot demoulding, coating must keep complete, can spray after casting to breaking point at every turn again.This coating cost is low, the coating only about 1-2kg that average silicon per ton consumes, and cost is 3-5 unit, only need stir in simple container, and the holding time is longer, easy to use, nontoxic.
Detailed description of the invention
Further illustrate the present invention below in conjunction with embodiment, but the scope of protection of present invention is not limited to the scope of embodiment statement.
Embodiment 1:
A kind of high temperature resistant mould wash, adopts SiO
2content is alkaline silica sol 100 parts, 80 ~ 100 object graphite powder 8 parts of 30%, waterglass 0.5 part, obtained after being fully uniformly mixed.During use, adopt spray gun to be sprayed on cast steel ingot mould surface, coating layer thickness is about 1mm, to utilize after the ingot mould demoulding heat coating of self can be dry as quick as thought, forms complete coating.After treating that coating protective layer is formed, by temperature be the silicon liquid of 1500 ~ 1550 DEG C slowly pour into from silicon bag coat High temperature release coating ingot mould in.After silicon liquid cooled and solidified, topple over ingot mould, silico briquette comes off easily, surfacing.Ingot mould coating after use is substantially complete, non-corrosive damage.
Embodiment 2:
A kind of high temperature resistant mould wash, adopts SiO
2content is alkaline silica sol 100 parts, 80 ~ 100 object graphite powder 15 parts of 20%, waterglass 0.5 part.Obtained after being fully uniformly mixed.During use, adopt spray gun to be sprayed on cast steel ingot mould surface, coating layer thickness is about 2mm, to utilize after the ingot mould demoulding heat coating of self can be dry as quick as thought.After treating that coating protective layer is formed, by temperature be the silicon liquid of 1500 ~ 1550 DEG C slowly pour into from silicon bag coat High temperature release coating ingot mould in.After silicon liquid cooled and solidified, topple over ingot mould, silico briquette comes off easily, surfacing.Ingot mould coating after use is substantially complete, non-corrosive damage.
Embodiment 3:
A kind of high temperature resistant mould wash, adopts SiO
2content is alkaline silica sol 100 parts, 80 ~ 100 object graphite powder 8 parts of 40%, waterglass 0.8 part.Obtained after being fully uniformly mixed.During use, adopt spray gun to be sprayed on cast steel ingot mould surface, coating layer thickness is about 1.5mm, to utilize after the ingot mould demoulding heat coating of self can be dry as quick as thought.After treating that coating protective layer is formed, by temperature be the silicon liquid of 1500 ~ 1550 DEG C slowly pour into from silicon bag coat High temperature release coating ingot mould in.After silicon liquid cooled and solidified, topple over ingot mould, silico briquette comes off easily, surfacing.Ingot mould coating after use is substantially complete, non-corrosive damage.
Embodiment 4:
A kind of high temperature resistant mould wash, adopts SiO
2content is alkaline silica sol 100 parts, 80 ~ 100 object graphite powder 20 parts of 20%, waterglass 0.2 part.Obtained after being fully uniformly mixed.During use, adopt spray gun to be sprayed on cast steel ingot mould surface, coating layer thickness is about 1mm, to utilize after the ingot mould demoulding heat coating of self can be dry as quick as thought.After treating that coating protective layer is formed, by temperature be the silicon liquid of 1500 ~ 1550 DEG C slowly pour into from silicon bag coat High temperature release coating ingot mould in.After silicon liquid cooled and solidified, topple over ingot mould, silico briquette comes off easily, surfacing.Ingot mould coating after use is substantially complete, non-corrosive damage.
Through experimental verification, after using above-mentioned coating to protect ingot mould, ingot mould is extended for about 100 times from 30-50 time service life.If damage appears in coating protection layer in use procedure, only again need spray at impaired loci when next time uses.
Claims (6)
1. a high temperature resistant mould wash, is characterized in that: the following raw material by by weight: alkaline silica sol, graphite powder, dispersant obtain in the ratio of 100:5 ~ 20:0.1 ~ 1; The wherein SiO of alkaline silica sol
2content is 20 ~ 40%; This coating is used for spraying or brushes at ingot mould inwall.
2. high temperature resistant mould wash according to claim 1, is characterized in that: the SiO of described alkaline silica sol
2content is 30%.
3. high temperature resistant mould wash according to claim 1, is characterized in that: the granularity of described graphite powder is 30 ~ 100 orders.
4. high temperature resistant mould wash according to claim 1, is characterized in that: described dispersant is silicates dispersant.
5. high temperature resistant mould wash according to claim 1, is characterized in that: described coating adopts SiO
2content be 30% alkaline silica sol, 100 order graphite powders, waterglass by weight 100:8 ~ 10:0.5 ratio obtain.
6. the preparation method of the high temperature resistant mould wash that one of claim 1-5 is described, is characterized in that: alkaline silica sol, graphite powder, dispersant are proportionally mixed, can obtain high temperature resistant mould wash after stirring.
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| CN201310487080.3A CN103551495B (en) | 2013-10-17 | 2013-10-17 | A kind of high temperature resistant mould wash and preparation method thereof |
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| CN201310487080.3A CN103551495B (en) | 2013-10-17 | 2013-10-17 | A kind of high temperature resistant mould wash and preparation method thereof |
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| CN103551495B true CN103551495B (en) | 2015-10-28 |
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| CN105921688A (en) * | 2016-06-07 | 2016-09-07 | 平顶山市美伊金属制品有限公司 | Composite release agent for die casting of metal cooker and preparation method thereof |
| CN105921687A (en) * | 2016-06-07 | 2016-09-07 | 平顶山市美伊金属制品有限公司 | Casting release agent for producing cast iron pan and preparation method thereof |
| CN107418655B (en) * | 2017-09-06 | 2020-02-07 | 辽宁工程技术大学 | Biomass lubricant for casting and demolding and preparation method thereof |
| CN110093664B (en) * | 2019-05-06 | 2020-04-28 | 新疆泰宇达环保科技有限公司 | Polycrystalline silicon ingot mold, using method and coating preparation method |
| CN110184650B (en) * | 2019-05-06 | 2020-04-21 | 新疆泰宇达环保科技有限公司 | Ingot mold coating for industrial silicon production and preparation method thereof |
| CN114106601B (en) * | 2021-12-30 | 2022-12-13 | 上海中化科技有限公司 | Stripping coating composition and method for preparing polyimide film by using same |
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| CN1082466A (en) * | 1993-02-15 | 1994-02-23 | 大连冷冻机厂 | Resin sand mould (core) or cast part type (core) is used water based paint |
| JP2003010958A (en) * | 2001-06-28 | 2003-01-15 | Mitsui Mining & Smelting Co Ltd | Mold for die cast molding, die cast molding method, and molded product |
| CN102049464A (en) * | 2011-01-26 | 2011-05-11 | 东风汽车有限公司 | Special coating for full mold casting and preparation method thereof |
| CN102836952A (en) * | 2012-08-31 | 2012-12-26 | 太仓科博尔精密铸业有限公司 | Resin sand type casting coating and preparation method thereof |
| CN103100650A (en) * | 2012-12-11 | 2013-05-15 | 芜湖恒坤汽车部件有限公司 | Preparation method of anti-burnt-on sand full-mold casting coating |
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2013
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1082466A (en) * | 1993-02-15 | 1994-02-23 | 大连冷冻机厂 | Resin sand mould (core) or cast part type (core) is used water based paint |
| JP2003010958A (en) * | 2001-06-28 | 2003-01-15 | Mitsui Mining & Smelting Co Ltd | Mold for die cast molding, die cast molding method, and molded product |
| CN102049464A (en) * | 2011-01-26 | 2011-05-11 | 东风汽车有限公司 | Special coating for full mold casting and preparation method thereof |
| CN102836952A (en) * | 2012-08-31 | 2012-12-26 | 太仓科博尔精密铸业有限公司 | Resin sand type casting coating and preparation method thereof |
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Effective date of registration: 20151224 Address after: North Bridge of Guazhou County in Gansu province Jiuquan City Industrial Park 735000 Patentee after: GANSU SANXIN SILICON INDUSTRY CO., LTD. Address before: 443005 Hubei province Yichang City Kiln Road No. 37 Patentee before: HUBEI SANXIN SILICON CO., LTD. |
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