CN103551495A - High temperature-resistant de-molding paint as well as preparation method thereof - Google Patents
High temperature-resistant de-molding paint as well as preparation method thereof Download PDFInfo
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- CN103551495A CN103551495A CN201310487080.3A CN201310487080A CN103551495A CN 103551495 A CN103551495 A CN 103551495A CN 201310487080 A CN201310487080 A CN 201310487080A CN 103551495 A CN103551495 A CN 103551495A
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Abstract
The invention discloses high temperature-resistant de-molding paint which is prepared from alkaline silica sol, graphite powder and a dispersing agent in a proportion of 100:(5-20):(0.1-1), wherein SiO2 content of the alkaline silica sol is 20%-40%; and grain size of the graphite powder is 30 meshes-100 meshes. According to the high temperature-resistant de-molding paint as well as the preparation method disclosed by the invention, conglutination of the paint can be greatly lowered by adding the graphite powder in the alkaline silica sol, a paint protective layer obtained by coating is uniform in thickness, flat and smooth, and bottom and sides are protected; moreover, dosage is a little, and a firm protective film can be formed by only spraying a thin layer of paint; besides, the graphite powder and the silica sol are uniformly fixed, and after forming the protective layer, the graphite powder is dispersed in the silica sol and not dispersed inside a cast ingot to affect product quality.
Description
Technical field
The present invention relates to a kind of high-temperature resistant coating, be specifically related to a kind ofly can protect ingot mould to stand high temperature to wash away, not by the coating of high temperature erosion.
Background technology
High-temperature coatings generally refers to and can bear for a long time 200 ℃ of above temperature, and can keep certain physical and chemical performance, the specific functionality coating that protected object can normally be played 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 ℃.If want, can bear higher temperature, generally will consider inorganic coating.
Operation that must experience 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, and then cooled and solidified gradually, finally pours out ferroalloy/metal silico briquette by toppling over.For protection cast steel ingot mould is not corroded by the high-temp liquid of 1500 ℃, conventionally need in ingot mould, form interlayer liquid is not directly contacted with ingot mould.
Summary of the invention
In production in the past, the interlayer material conventionally adopting is graphite powder or silico briquette/powder, by graphite powder or silico briquette/powder are sprinkling upon in ingot mould to form interlayer.But there is more shortcoming in it: 1. graphite powder layer became uneven, and ingot mould side is difficult to form protection; 2. graphite bisque is too thin is difficult to play effective protection to ingot mould, and the consumption that spreads graphite powder thick is bigger than normal again, and cost is higher; 3. graphite powder and ingot mould do not have bondingly, and the scouring force forming 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 after cooling in ingot casting, increases the content of carbon impurity; While 5. adopting silico briquette/powder, silico briquette/the powder of different batches is as interlayer, can combine together by silico briquette/powder after pouring the melting liquid cools in ingot mould into, and be in melting liquid, to bring more impurity into, and because some silicon need to circulate as interlayer, reduced 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, can overcome the erosion of high temperature iron aluminium alloy/silicon liquid to 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, by following raw material by weight: alkaline silica sol, graphite powder, dispersant make 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 adopting
2content is 30%.
The granularity of described graphite powder is 30 ~ 100 orders.Graphite powder order number disperses bad when too low, easily deposition; When order number is too high, price is high and be difficult for mixing
Described dispersant is silicates dispersant, as sodium metasilicate, potassium silicate etc.; Add that dispersant is 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 is that 30% alkaline silica sol, 100 order graphite powders, waterglass make by weight the ratio of 100:8 ~ 10:0.5.By a large amount of tests, verify, this scheme is best proportioning, and the dope viscosity obtaining is moderate, be easy to spraying or brush, and buying preparation is convenient.The proportioning ratio of alkaline silica sol and graphite powder is mainly according to the applicable principle of dope viscosity: if alkaline silica sol concentration is low, graphite powder consumption can improve, otherwise when spraying sidewall, moisture evaporation rate is unable to catch up with the coating speed of trickling downwards, causes coating heterogeneity; But alkaline silica sol concentration is high, graphite powder is dispersed to be reduced, and silicon liquid and its adhesive increase, and spraying is inconvenient.
Alkaline silica sol, graphite powder, dispersant are proportionally mixed, after stirring, can obtain high temperature resistant mould wash.
When Ludox moisture evaporates, colloidal particle can be attached to body surface securely, forms silicon oxygen bond combination between particle, is good adhesive and additive.Acidic silicasol is in metastable condition, and the trend that gelatification, especially high-concentration silicon sol can occur in put procedure is gradually 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, thereby slowly corrode ingot mould.Thereby select alkaline silica sol as raw material in this coating.
Because Ludox can be used as bonding agent, using, is low viscous colloidal solution, and good dispersion, can fully immerse and be filled to ingot mould inwall, makes its surface smoothing, and forms afterwards firm film in dehydration.Simple use Ludox is infeasible as high-temperature coatings, because silicon liquid and the SiO of melting
2meeting adhesion, and the present invention can reduce its adhesive greatly by add graphite powder in alkaline silica sol.
While using this coating, high-temperature resistant coating is sprayed or brushed after ingot mould inwall, the moisture evaporation in coating, thus form fine and close smooth protective layer.In actual serialization is produced, after ingot casting product stripping, it is awfully hot that ingot mould remains, and after high-temperature coatings spraying or brushing above, in coating, moisture evaporation is exceedingly fast, and just evaporation substantially after the several seconds conventionally, forms protective layer.About the thickness of coating, because silicon water is when pouring into ingot mould at the beginning, there is to larger scouring force ingot mould bottom.If coating layer thickness is too thin, may be by silicon water by base coat erosion damage, silicon the water is just on the boil begin that point of contact ingot mould especially.Therefore, the coating layer thickness of ingot mould bottom should be too not thin, the height of toppling over according to silicon bag, approximately 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, smooth smooth, bottom side can be protected;
2) only need the upper thin layer of spraying, just can form firm diaphragm, consumption is low, and cost is low;
3), because graphite powder mixes with Ludox, the graphite powder forming after protective layer is dispersed in Ludox, so can not be distributed to inside ingot, affects product quality.
This kind of coating formula is that silicon water damages in large situation and develops ingot mould while casting for metallic silicon smelting, it is with strong points and preparation is simple, when this coating not, silicon water also can be brought the metal impurities of ingot mould in silicon in to ingot mould damage, makes impurity content increase.While preparing this coating, only need allow has one deck can resistant to elevated temperatures interlayer and little to the pollution of silicon water between cast steel ingot mould and silicon water, and after not requiring the silicon ingot demoulding, coating must keep complete, after casting, can spray breaking point at every turn again.This coating cost is low, and the coating that average silicon per ton consumes is about 1-2kg only, and cost is 3-5 unit, only need in simple container, stir, and the holding time is longer, easy to use, nontoxic.
The specific embodiment
Below in conjunction with embodiment, further illustrate the present invention, but the scope of protection of present invention is not limited to the scope of embodiment statement.
Embodiment 1:
A mould wash, adopts SiO
2content is 30% 100 parts of alkaline silica sols, 8 parts of 80 ~ 100 object graphite powders, and 0.5 part of waterglass makes after being fully uniformly mixed.During use, adopt spray gun to be sprayed on cast steel ingot mould surface, the about 1mm of coating layer thickness, utilizes the heat coating of self after the ingot mould demoulding to be dried as quick as thought, forms complete coating.After treating that coating protection layer forms, by temperature, be that the silicon liquid of 1500 ~ 1550 ℃ slowly pours in the ingot mould that has sprayed high temperature mould wash from silicon bag.After silicon liquid cooled and solidified, topple over ingot mould, silico briquette comes off easily, surfacing.Ingot mould coating after using is substantially complete, non-corrosive damage.
Embodiment 2:
A mould wash, adopts SiO
2content is 20% 100 parts of alkaline silica sols, 15 parts of 80 ~ 100 object graphite powders, 0.5 part of waterglass.After being fully uniformly mixed, make.During use, adopt spray gun to be sprayed on cast steel ingot mould surface, the about 2mm of coating layer thickness, utilizes the heat coating of self after the ingot mould demoulding to be dried as quick as thought.After treating that coating protection layer forms, by temperature, be that the silicon liquid of 1500 ~ 1550 ℃ slowly pours in the ingot mould that has sprayed high temperature mould wash from silicon bag.After silicon liquid cooled and solidified, topple over ingot mould, silico briquette comes off easily, surfacing.Ingot mould coating after using is substantially complete, non-corrosive damage.
Embodiment 3:
A mould wash, adopts SiO
2content is 40% 100 parts of alkaline silica sols, 8 parts of 80 ~ 100 object graphite powders, 0.8 part of waterglass.After being fully uniformly mixed, make.During use, adopt spray gun to be sprayed on cast steel ingot mould surface, the about 1.5mm of coating layer thickness, utilizes the heat coating of self after the ingot mould demoulding to be dried as quick as thought.After treating that coating protection layer forms, by temperature, be that the silicon liquid of 1500 ~ 1550 ℃ slowly pours in the ingot mould that has sprayed high temperature mould wash from silicon bag.After silicon liquid cooled and solidified, topple over ingot mould, silico briquette comes off easily, surfacing.Ingot mould coating after using is substantially complete, non-corrosive damage.
Embodiment 4:
A mould wash, adopts SiO
2content is 20% 100 parts of alkaline silica sols, 20 parts of 80 ~ 100 object graphite powders, 0.2 part of waterglass.After being fully uniformly mixed, make.During use, adopt spray gun to be sprayed on cast steel ingot mould surface, the about 1mm of coating layer thickness, utilizes the heat coating of self after the ingot mould demoulding to be dried as quick as thought.After treating that coating protection layer forms, by temperature, be that the silicon liquid of 1500 ~ 1550 ℃ slowly pours in the ingot mould that has sprayed high temperature mould wash from silicon bag.After silicon liquid cooled and solidified, topple over ingot mould, silico briquette comes off easily, surfacing.Ingot mould coating after using is substantially complete, non-corrosive damage.
Through experimental verification, after using above-mentioned coating to protect ingot mould, ingot mould is extended for left and right 100 times from 30-50 time service life.If damage appears in coating protection layer in use procedure, only need at impaired loci again spray while using next time.
Claims (7)
1. a high temperature resistant mould wash, is characterized in that: by following raw material by weight: alkaline silica sol, graphite powder, dispersant make in the ratio of 100:5 ~ 20:0.1 ~ 1.
2. high temperature resistant mould wash according to claim 1, is characterized in that: the SiO of described alkaline silica sol
2content is 20 ~ 40%.
3. high temperature resistant mould wash according to claim 1 and 2, is characterized in that: the SiO of described alkaline silica sol
2content is 30%.
4. high temperature resistant mould wash according to claim 1, is characterized in that: the granularity of described graphite powder is 30 ~ 100 orders.
5. high temperature resistant mould wash according to claim 1, is characterized in that: described dispersant is silicates dispersant.
6. high temperature resistant mould wash according to claim 1, is characterized in that: described coating adopts SiO
2content is that 30% alkaline silica sol, 100 order graphite powders, waterglass make by weight the ratio of 100:8 ~ 10:0.5.
7. the preparation method of the high temperature resistant mould wash described in one of claim 1-6, is characterized in that: alkaline silica sol, graphite powder, dispersant are proportionally mixed, after stirring, can obtain high temperature resistant mould wash.
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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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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN107418655A (en) * | 2017-09-06 | 2017-12-01 | 辽宁工程技术大学 | One kind casting demoulding biomass lubricant and preparation method thereof |
| CN110093664A (en) * | 2019-05-06 | 2019-08-06 | 新疆泰宇达环保科技有限公司 | A kind of polysilicon ingot mould and application method, preparation method for coating |
| CN110184650A (en) * | 2019-05-06 | 2019-08-30 | 新疆泰宇达环保科技有限公司 | Ingot mould coating and preparation method thereof for industrial silicon production |
| CN114106601A (en) * | 2021-12-30 | 2022-03-01 | 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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| 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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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| CN107418655A (en) * | 2017-09-06 | 2017-12-01 | 辽宁工程技术大学 | One kind casting demoulding biomass lubricant 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 |
| CN110093664A (en) * | 2019-05-06 | 2019-08-06 | 新疆泰宇达环保科技有限公司 | A kind of polysilicon ingot mould and application method, preparation method for coating |
| CN110184650A (en) * | 2019-05-06 | 2019-08-30 | 新疆泰宇达环保科技有限公司 | Ingot mould coating and preparation method thereof for industrial silicon production |
| 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 |
| CN114106601A (en) * | 2021-12-30 | 2022-03-01 | 上海中化科技有限公司 | Stripping coating composition and method for preparing polyimide film by using same |
| 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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| CN103551495B (en) | 2015-10-28 |
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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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