CN101024739A - Water inorganic heat-resisting coating and solidifying method - Google Patents
Water inorganic heat-resisting coating and solidifying method Download PDFInfo
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- CN101024739A CN101024739A CN 200710021131 CN200710021131A CN101024739A CN 101024739 A CN101024739 A CN 101024739A CN 200710021131 CN200710021131 CN 200710021131 CN 200710021131 A CN200710021131 A CN 200710021131A CN 101024739 A CN101024739 A CN 101024739A
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Abstract
The invention relates to aqueous inorganic heat resistant paint coating on the surface of material. It includes solid phase and liquid phase, and the ratio is 0.95-1.05:1. The solid phase includes kaolin 35-46%, quartz powder 30-35%, ceramic short fiber 4-10% and titanium dioxide 4-8%, iron red 10-15%. The liquid phase includes 3.5-6.5% auxiliary agent and the rest is sodium water glass. The method is that the paint is coated onto the surface of the material and laying for 0.5h at 50-70 degree centigrade, and laying for 0.5h at 100-150 degree centigrade, and laying for 0.5h at 240-260 degree centigrade. The invention has good coating capability, strong adhesion, good stability, no harmful to human, etc.
Description
Technical field
The present invention relates to a kind of heat resisting coating and curing thereof, relate in particular to a kind of water inorganic heat-resisting coating and curing thereof.
Background technology
Coating is meant that being applied to body surface can form and have protection, decoration or property a solid-state class I liquid I of filming of (as insulation, anticorrosion, sign etc.) or the general name of solid material, comprises oil (property) lacquer, water-miscible paint, powder coating.Development along with modern industrial technology, the equipment of industries such as chemical industry, metallurgy, electric power is not standing the pyritous test all the time, under such mal-condition, the life-span of equipment reduces, production cost increases, and bring big hidden danger to safety in production, though the report of some high temperature materials is also arranged, generally speaking use the restriction of going up still tolerable temperature or cost.Along with expanding economy, the raising to resistance to elevated temperatures requires makes engineering circle more and more pay close attention to high-temperature resistant coating.High-temperature resistant coating has the advantages that still to keep certain physical and chemical performance under hot conditions, makes workpiece high temperature resistant, thereby prolongs its work-ing life, plays the effect of surface protection and decoration.Present organic high temperature-resistant coating such as silicon-type, tetraethyl silicate system, general anti-only 200～700 ℃ high temperature, and hardness of film is low, the flame resistivity poor durability, and have environmental issue.
Summary of the invention
The invention provides that a kind of production cost is low, the water inorganic heat-resisting coating of long service life and curing thereof, coating has the advantage of hardness and impact strength height, high temperature splitting resistance and good stability, waterproof anti-corrosion and difficult drop-off.
The present invention adopts following technical scheme:
A kind of water inorganic heat-resisting coating that is applied to body surface of the present invention, comprise solid phase and liquid phase, solid-liquid mass ratio 0.95～1.05: 1, solid phase comprises kaolin, silica powder, ceramic short fiber and titanium dioxide, its mass percent is: kaolin 35～46%, silica powder 30～35%, ceramic short fiber 4～10%, titanium dioxide 4～8%, iron oxide red 10～15%, liquid composition is sodium silicate and auxiliary agent, auxiliary agent is 3.5%～6.5% of a liquid phase quality, surplus is a sodium silicate, and auxiliary agent comprises that mass concentration is that 50 ± 5% aqueous sodium hydroxide solutions and rosin quality concentration are 20～30% rosin alcohol, and aqueous sodium hydroxide solution and rosin alcohol quality proportioning are 0.9～1.1: 1.Solid phase is made up of kaolin, silica powder, alumina short fibre, titanium dioxide and iron oxide red, and its mass percent is: kaolin 35～46%, silica powder 30～35%, ceramic short fiber 4～10%, titanium dioxide 4～8%, iron oxide red 10～15%.Kaolinic granularity is 800～1250 orders, and the granularity of silica powder is 200～300 orders, the granularity of iron oxide red＞800 orders, and the granularity of titanium dioxide～0.3 μ m, the modulus of sodium silicate is 3.0-3.3.Ceramic short fiber is an aluminum oxide, the mixture of one or more in pure aluminium silicate or the mullite ceramic staple fibre, and the aluminum oxide quality content in the fiber is 60%～80%, Fibre diameter 5～10 μ m, length-to-diameter ratio 50～150.
The curing of water inorganic heat-resisting coating of the present invention is after above-mentioned aqueous inorganic paint is coated on body surface, to place 50-70 ℃ of following 0.5h, places 100-150 ℃ of following 0.5h again, and is last, places 240-260 ℃ of following 0.5h.
Compared with prior art, the present invention has following advantage:
The present invention mainly is applicable to metal parts or the brick that uses under the high temperature, the surfacecti proteon of concrete member.For example metallurgical Equipment for Heating Processing or the parts smelted, construction work, the anti-high temperature surface treatment of the fire prevention of mechanical means etc.Be applicable to the high temperature protection of (for the protection of iron and steel Base Metal) below 1000 ℃ and (for the inorganic silicate concrete protection) below 1220 ℃.
Contain ceramic short fiber in the coating of the present invention, be again aqueous inorganic paint simultaneously, coating property is good, strong adhesion, the hardness of gained coating and impact strength height have fabulous high temperature splitting resistance and stability, water-repellancy, non-corrosibility,, difficult drop-off is difficult for and external environment factor generation chemical reaction, and is harmless.Can prolong the work-ing life of coated article widely, reduce production costs, have better result of use and economic benefit and environment protection significance.
Description of drawings
Fig. 1 is preparation were established figure of the present invention.
Fig. 2 is the high-temperature stability comparison diagram as a result of coating of the present invention, a: coating of the present invention, b: import coating, c: homemade coating.
Fig. 3 is a 1272h water tolerance test situation, a: coating of the present invention, b: import coating, c: homemade coating.
Fig. 4 is the local fracture figure of fiber.
Fig. 5 is the situation (SEM amplify 200 times) of coating of the present invention through high temperature exposure test back coating surface.
Embodiment
Embodiment 1: a kind of water inorganic heat-resisting coating, solid ingredient in the prescription: kaolin 45.5%, silica powder 31.8%, iron oxide red 13.6%, alumina short fibre 4.6%, titanium dioxide 4.6%; The weight ratio of solid ingredient and liquid ingredient is 1: 1, liquid component: wherein liquid flux is 5% of a total amount.Brush on A3 steel and refractory brick surface respectively and place 50 ℃ of following 0.5h, place 100 ℃ of following 0.5h again, last, after placing 240 ℃ of following 0.5h to solidify, at high temperature keep 2 hours postcooling, grade to brushing the surface by standard GB/T1766-1995, the result is as follows:
The A3 steel,, bubble: 0 grade, peel off by 1000 ℃: 0 grade, variable color: 3 grades, cracking: 0 grade
Refractory brick,, bubble: 0 grade, peel off by 1220 ℃: 0 grade, variable color: 2 grades, cracking: 0 grade
Embodiment 2: a kind of water inorganic heat-resisting coating, solid ingredient in the prescription: kaolin 42.6%, silica powder 30.1%, iron oxide red 12.5%, sapphire whisker 10.0%, titanium dioxide 4.8%; The weight ratio of solid ingredient and liquid ingredient is 1: 1, liquid component: wherein liquid flux is 5% of a total amount.Brushing curing, high temperature keep test and grade the samely, and rating result is as follows:
The A3 steel,, bubble: 0 grade, peel off by 1000 ℃: 0 grade, variable color: 3 grades, cracking: 0 grade
Refractory brick,, bubble: 0 grade, peel off by 1220 ℃: 0 grade, variable color: 2 grades, cracking: 0 grade
More than two examples all demonstrate high-temperature resistant result preferably.
Embodiment 3: a kind of water inorganic heat-resisting coating, solid ingredient in the prescription: kaolin 37.0%, silica powder 35.0%, iron oxide red 10.0%, sapphire whisker 10.0%, titanium dioxide 8.0%; The weight ratio of solid ingredient and liquid ingredient is 1: 1.2, liquid component: wherein liquid flux is 5% of a total amount.
This proportioning liquid ingredient is too high, and the wet sticking power of coating is on the low side as a result, its wet sticking power: 0.8N (normal value average out to 1.3N).At A3 steel external coating, slight foaming phenomenon appears in 900 ℃ of tests in addition, and the test rating result is as follows:
The A3 steel,, bubble by 900 ℃: the 2S2 level, peel off: 0 grade, variable color: 3 grades, cracking: 0 grade
Embodiment 4: a kind of water inorganic heat-resisting coating, solid ingredient in the prescription: kaolin 41.7%, silica powder 29.2%, iron oxide red 12.5%, sapphire whisker 12.5%, titanium dioxide 4.2%; The weight ratio of solid ingredient and liquid ingredient is 1: 1, liquid component: wherein liquid flux is 5% of a total amount.
This proportioning sapphire whisker component is too high, and brushing property is relatively poor, and the surface after the brushing is more coarse.The foaming phenomenon appears through the high temperature test metallic surface.The test rating result is as follows:
The A3 steel,, bubble by 1000 ℃: the 1S3 level, peel off: 0 grade, variable color: 4 grades, cracking: 0 grade
Refractory brick,, bubble: 0 grade, peel off by 1220 ℃: 0 grade, variable color: 2 grades, cracking: 0 grade
Embodiment 5: a kind of water inorganic heat-resisting coating, solid ingredient in the prescription: kaolin 57.1%, silica powder 25.0%, iron oxide red 10.7%, sapphire whisker 3.6%, titanium dioxide 3.6%; The weight ratio of solid ingredient and liquid ingredient is 1: 1, liquid component: wherein liquid flux is 5% of a total amount.
This proportioning kaolin component is too high, and the brushing performance of coating is good, but peeling phenomenon occurs through the high temperature test metallic surface.The test rating result is as follows:
The A3 steel,, bubble: 0 grade, peel off by 1000 ℃: 2S2, variable color: 4 grades, cracking: 0 grade
Refractory brick,, bubble: 0 grade, peel off by 1220 ℃: 0 grade, variable color: 2 grades, cracking: 0 grade
Embodiment 6: a kind of water inorganic heat-resisting coating, solid ingredient in the prescription: kaolin 45.5%, silica powder 31.8%, iron oxide red 13.6%, sapphire whisker 4.6%, filler A4.6%; The weight ratio of solid ingredient and liquid ingredient is 1: 1, liquid component: wherein liquid flux is 5% of a total amount.
Though prescription is within the scope of the present invention, not cured in stages processing after the brushing, but directly at 250 ℃ of insulation 1h: more serious peeling phenomenon at high temperature appears in the brushing surface as a result.The test rating result is as follows:
The A3 steel,, bubble by 900 ℃: the 5S4 level, peel off: 1S2a, variable color: 2 grades, cracking: 2S3
Embodiment 7: a kind of water inorganic heat-resisting coating, solid ingredient in the prescription: kaolin 35%, silica powder 30%, iron oxide red 10%, sapphire whisker 3.2%, mullite ceramic staple fibre 0.8%, titanium dioxide 4%; The weight ratio of solid ingredient and liquid ingredient is 1: 1, liquid component: wherein liquid flux is 5% of a total amount.Brushing curing, high temperature keep test and grade the samely, and rating result is as follows:
The A3 steel,, bubble: 0 grade, peel off by 1000 ℃: 0 grade, variable color: 3 grades, cracking: 0 grade
Refractory brick,, bubble: 0 grade, peel off by 1220 ℃: 0 grade, variable color: 2 grades, cracking: 0 grade
Above-mentioned:
Kaolin: technical grade, granularity 800～1250 orders
Silica powder: chemical pure, granularity 200～300 orders
Iron oxide red: technical grade, granularity＞800 orders
Titanium dioxide (titanium dioxide): technical grade, granularity～0.3 μ m
Sodium silicate: technical grade, modulus 3.0-3.3
Ceramic short fiber adopts Mechanical Crushing to add the method for screening.
The process for preparation of coating, brushing process and solidification treatment:
The preparation of auxiliary agent:
1) rosin of certainweight is dissolved in industrial spirit and make 20～30% rosin alcohol;
2) according to 0.9～1.1: 1 quality proportioning is fused and stir with 50% aqueous sodium hydroxide solution and above-mentioned rosin alcohol, makes auxiliary agent;
The preparation of coating (technological process is with reference to Fig. 1):
1) ready solid-phase raw materials is put into mixing tank behind the weighing in proportion, thorough mixing is even as far as possible with the mechanical stirring method;
2) adding waits the part by weight liquid phase, fully stirs.Adopt the mechanical stirring mode, change the surface energy of particle, make each component fully wetting, mix.
3) coating can add water in right amount and stir long afterwards storage period, adjusts the viscosity of coating.
Brushing:
Before the brushing of coating, earlier the base material that is coated with is carried out simple cleaning surfaces scrubbing, then coating directly is painted on the base material.Can suitably control coating thickness by repeatedly brushing.Also can adopt the spraying coating process mode.
After the brushing of coating, place for some time at room temperature, carry out the volatilization of the membranae praeformativa and the moisture content of coating;
Solidification treatment:
The high thermal resistance that experiment shows coating coating after the segmentation solidification treatment is better than the direct hot setting of coating.Brushing is at steel surface, and behind 50 ℃ 0.5h+150 ℃ this curing process of processing 0.5h+250 ℃ of processing 0.5h, high thermal resistance is good to reach 1000 ℃ (metallic surfaces), brush at brick, and concrete surface, heatproof can reach 1220 ℃.Reduce hot setting and handle or do not handle still and can use, but resistant to elevated temperatures effect can reduce.
The performance of coating of the present invention
With above-mentioned formulation for coating material through several performances of above-mentioned coating process test and with the comparison of the homemade coating of certain import coating and market sale
High thermal resistance: A3 steel matrix coating heatproof reaches 1000 ℃, and refractory brick basal body coating layer heatproof reaches 1220 ℃;
Its comparative result such as Fig. 2.
Shearing force:
The difference coating layer after solidifying, is measured cohesive strength (data such as table 1) on ceramic matrix, metallic iron matrix.As seen no matter ceramic bases still on metal base the cohesive strength of coating of the present invention all be significantly higher than correlated import coating and homemade coating.
Each coating of table 1 is in the cohesive strength of different matrix
| Substrate | Coating of the present invention (MPa) | Import coating (MPa) | Homemade coating (MPa) |
| Ceramic bases | 9.50 10.02 9.86 | 0.20 0.15 0.16 | 5.71 6.40 6.01 |
| At the bottom of the iron-based | 7.30 7.40 10.01 | 0.43 0.34 0.39 | 4.55 5.06 5.16 |
Hardness:
Hardness＞the 90.3HRB of coating on the iron-based body, the hardness＞82.0HRB of coating on the copper matrix
Heat-shock resistance:
Respectively with several contrast coating coateds on iron plate and ceramic block, be heated to 300 ℃ from room temperature, be incubated that hardening is cold again after 15 minutes.7 times repeatedly, result such as table 2.Coating generally speaking of the present invention is put up the best performance.Do not have and bubble crackle, peeling phenomenon.
Table 2: the 7th cycling hot pinking result
| Matrix | Coating | Variable color | Bubble | Crackle | Peel off |
| Iron plate | The homemade coating of import coating coating of the present invention | Shoal black/ | / become greatly/ | On a small quantity // | More a small amount of |
| Ceramic block | The homemade coating of import coating coating of the present invention | / / / | / / / | In a large number // | More a small amount of/ |
Water tolerance
At room temperature will brush coating of the present invention, the iron plate of import coating and homemade coating is immersed in the water.With the increase of soaking time, the self-control coating shows relative excellent characteristic, only bubbles on a small quantity after nearly 2 months time of immersion, and the import coating then occurs with big area iron rust and microgroove, and homemade coating is then bubbled in a large number with the increase of soaking time, as shown in Figure 3.All coating on copper matrix, the aluminum substrate all show water tolerance preferably.In general, the coating of coating of the present invention is not subjected to the influence of matrix, keeps the excellent water tolerance energy.
Salt water resistance corrodibility
Above-mentioned three kinds of coating are brushed respectively at iron by processing requirement, and copper on the aluminium plate, is put into salt solution then and was soaked 34 days.The result shows that the import coating on the iron-based body is subjected to corrosion the most severe, almost completely changes in experimental period.Homemade coating also has variable color and foaming phenomenon.Coating of the present invention shows more excellent on resistance to salt water.
The effect of ceramic alumina fiber in coating
The principal feature of sapphire whisker (comprising aluminum oxide, pure aluminium silicate, mullite fiber) is a good heat resistance, and maximum operating temperature can reach 1500～1600 ℃, and chemical stability is good; Tensile strength can reach 1000MPa, surpasses the intensity of ordinary steel, and Young's modulus is more than the 150GPa, the mechanics elongation is little. and have splendid resistance to chemical attack and oxidation-resistance, electric insulation, electric wave-transparent are good, are a kind of good heat-resistance materials, the enhancing body of lagging material and matrix material.
The present invention introduces alumina short fibre in the high-temperature resistant coating, according to experimental study, alumina short fibre in high-temperature resistant coating, mainly play a part several aspect:
1, because sapphire whisker itself is the industrial high temperature resistant and lagging material of ideal, so, can obviously improve the high thermal resistance of coating with its filler as high-temperature resistant coating;
2, alumina short fibre distributes with three-dimensional network-like structure in coating, is similar to the effect of stiffening web, can prevent coating be full of cracks and other forms of cracking effectively, this be owing to:
(a). because the great-leap-forward of fiber connects,, make the expansion of crackle be subjected to the constraint of fiber, effectively prevent the generation and the development of crackle splitting the sharp interlock effect of locating to play bridge joint effect and fiber; (as Fig. 4, shown in 5)
(b) under the external force effect, also can produce dislocation and slippage between means of particulate material,, can effectively overcome intergranular relative slippage, reduce fissured generation because the network constraint effect of fiber in coating with stress transfer, makes stress distribution even.
3, when stressed, the staple fibre of high strength, high elastic coefficient can be shared the part applied stress for coating, shows higher intensity, hardness.When stress is excessive, can rupture at local staple fibre, with the form consumption portion of energy of " extracting merit ".
4, in the brushing process, fiber produces certain cohesive force, and the cohesiveness of coating is increased, and adhesive force of coatings is strengthened greatly.
5, in cure stage, crisscross fiber reinforcement structure net helps the volatilization of hygrometric state water content of coating and the curing that enters the acceleration coating of CO2.Fibre network shape structure can reduce the breathing that film forming is shunk and the temperature difference causes and change, and makes the more rational mechanical structure of formation behind the paint solidification.Fiber also has detrimental action as coating composition: can reduce the brushing technique of coating, and the surface luster effect after the brushing.So must control add-on within the specific limits.
Claims (5)
1, a kind of water inorganic heat-resisting coating that is applied to body surface, it is characterized in that comprising solid phase and liquid phase, solid-liquid mass ratio 0.95～1.05: 1, solid phase comprises kaolin, silica powder, ceramic short fiber and titanium dioxide, its mass percent is: kaolin 35～46%, silica powder 30～35%, ceramic short fiber 4～10%, titanium dioxide 4～8%, iron oxide red 10～15%, liquid composition is sodium silicate and auxiliary agent, auxiliary agent is 3.5%～6.5% of a liquid phase quality, surplus is a sodium silicate, and auxiliary agent comprises that mass concentration is that 50 ± 5% aqueous sodium hydroxide solutions and rosin quality concentration are 20～30% rosin alcohol, and aqueous sodium hydroxide solution and rosin alcohol quality proportioning are 0.9～1.1: 1.
2, water inorganic heat-resisting coating according to claim 1, it is characterized in that solid phase is made up of kaolin, silica powder, alumina short fibre, titanium dioxide and iron oxide red, its mass percent is: kaolin 35～46%, silica powder 30～35%, ceramic short fiber 4～10%, titanium dioxide 4～8%, iron oxide red 10～15%.
3, water inorganic heat-resisting coating according to claim 2, it is characterized in that kaolinic granularity is 800～1250 orders, the granularity of silica powder is 200～300 orders, the granularity of iron oxide red＞800 orders, the granularity of titanium dioxide～0.3 μ m, the modulus of sodium silicate is 3.0-3.3.
4, water inorganic heat-resisting coating according to claim 1 and 2, it is characterized in that ceramic short fiber is an aluminum oxide, the mixture of one or more in pure aluminium silicate or the mullite ceramic staple fibre, aluminum oxide quality content in the fiber is 60%～80%, Fibre diameter 5～10 μ m, length-to-diameter ratio 50～150.
5, the curing of the described water inorganic heat-resisting coating of a kind of claim 1 is characterized in that after above-mentioned aqueous inorganic paint is coated on body surface, places 50-70 ℃ of following 0.5h, places 100-150 ℃ of following 0.5h again, and is last, places 240-260 ℃ of following 0.5h.
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| CN101585988B (en) * | 2008-05-22 | 2011-01-12 | 徐芗明 | High-temperature resistant coating and preparation method thereof |
| CN102250500A (en) * | 2011-05-04 | 2011-11-23 | 厦门大学 | Application of inorganic binder to packaging technology for preparing light-emitting diode |
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| CN102276229A (en) * | 2011-05-17 | 2011-12-14 | 广西大学 | Inorganic coating adopting geopolymer material as film-forming material |
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| CN102976775A (en) * | 2012-11-23 | 2013-03-20 | 山东鲁阳股份有限公司 | Novel composite coating and preparation method thereof |
| CN104841626A (en) * | 2015-02-16 | 2015-08-19 | 上海祥贸实业有限公司 | Repairing method of metal workpiece |
| CN105017822B (en) * | 2015-08-19 | 2017-08-11 | 合肥科德电力表面技术有限公司 | A kind of water-soluble inorganic high temperature resistant silicon hydrochlorate anticorrosive paint and preparation method thereof |
| CN105017822A (en) * | 2015-08-19 | 2015-11-04 | 合肥科德电力表面技术有限公司 | Water-soluble, high-temperature-resistant and anti-corrosive inorganic silicate paint and preparation method thereof |
| CN105174927A (en) * | 2015-10-16 | 2015-12-23 | 杭州浙大天元科技有限公司 | Anti-fouling and anti-slagging ceramic coating and preparation method |
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