CN1530406A - Ceramic thermal insulative pigment - Google Patents
Ceramic thermal insulative pigment Download PDFInfo
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- CN1530406A CN1530406A CNA03111167XA CN03111167A CN1530406A CN 1530406 A CN1530406 A CN 1530406A CN A03111167X A CNA03111167X A CN A03111167XA CN 03111167 A CN03111167 A CN 03111167A CN 1530406 A CN1530406 A CN 1530406A
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- external reflection
- infrared external
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Abstract
A thermally insulative ceramic paint contains ceramic microspheres (20-55 wt portions), adhesive (15-40), additive (5-40), infrared reflection stabilizer (5-10), infrared reflection additive, etc. Its advantage is high effective to reflect and scatter heat.
Description
Technical field: ceramic thermal insulation coating is the coating of a kind of coated at body surface, and the coating that coating forms has very high heat-insulating property, can also have very high antiseptic property.
Background technology:, after American Space General Administration's proposition provides the insulated heat of spaceship with the ceramic insulation brick, just assert that the coating thermal insulation is possible as far back as 1969.The data that American Space General Administration delivers show; in the ceramic insulation brick of thick 9.5-31.8mm; real performance heat insulating function be the thick ceramic coating skin of 0.25mm on the ceramic insulation brick, account for 95% of insulation effect, and the basic unit of ceramic insulation brick (foams) only provides 5% insulated heat.1977 for this reason, the U.S. set up a company, was devoted to research specially, developed and produce this coating.But its composition and mechanism are externally maintained secrecy all the time.It is generally acknowledged that super insulating material is meant: under predetermined working conditions, its thermal conductivity is lower than the thermal insulation material of " no convection current air " thermal conductivity.For adiabatic coating, (solid) thermal conduction is mainly assigned to finish by the solid part in the thermal insulation material; Thermal convection is then mainly finished by the air in the thermal insulation material; Thermal-radiating transmission is without any need for medium.Now all at the ceramic coating of being devoted to research and develop high-reflectivity, high radiant rate, low thermal conductivity.For general heat insulating coating, mainly be that the solid part in the thermal insulation material is selected, and the thermal convection in the material is significantly reduced that external radiant heat transfer is lower like this.Existing in addition adiabatic coating antiseptic property is lower, does not particularly have preservative property preferably for the metallic surface.
Summary of the invention:
Purpose of the present invention is exactly to solve the technical problem of conducting heat at the ceramic coating layer, therefore will realize adiabatic ground of coating purpose, and the one, when keeping enough physical strength, it is extreme little that its volume density is wanted; The 2nd, the convection current of air is attenuated to the limit; The 3rd, be by being bordering on infinite many interface and the modification by material makes thermal radiation drop to minimum through emission, scattering and absorption.A kind of ceramic thermal insulation coating of high-heat is provided, high-reflectivity, high radiant rate, low thermal conductivity ceramic thermal insulation coating further are provided, further provide also to have higher antiseptic property insulating ceramic coating.
Ceramic thermal insulation coating of the present invention contains ceramic microsphere 20-55 part by weight proportion, and binding agent 15-40 part is added material 5-40 part.Can also distinguish or the infrared external reflection stablizer of added weight 5-10 part simultaneously 2-5 part infrared external reflection additive.Certainly, can add some auxiliary agents, solvent and transforming agent and modulate modification as other existing coating.Contain auxiliary agent, solvent, transforming agent and coupler etc. in some binding agent, add these auxiliary compositions after if desired, can add auxiliary agent, the 15-25 solvent of coupler, 5-8 part of 5-10 part, the transforming agent of 3-5 part.Because the present invention has adopted ceramic microsphere as basic raw material, this material is to be made of some small ceramic particles that are suspended in the gel, this just makes that the hole diameter in the material is very little, air molecule in the pore has then lost free-pouring ability, but, at this moment be equivalent to be in the material and be similar to vacuum state relatively attached on the air vent wall.Simultaneously ceramic microsphere makes material internal contain extremely many emission interface and scattering particulate, reflection and scattered radiation heat, and add and expect and ceramic microsphere all has effect of heat insulation.Infrared external reflection stablizer, infrared external reflection additive and ceramic microsphere they stress face respectively to scattering, reflection and gas heat-transfer, so one, two or three combination all have heat-insulating capability, bestly is the collaborative thermal insulation of three.If select ceramic microsphere, infrared external reflection stablizer and infrared external reflection additive respectively as the heat insulation material that adds, under the situation of brushing thickness (2mm) and medium temperature (100 ℃), be respectively through surveying its surperficial heat flux: the about 7kJ m of ceramic microsphere
-2s
-1, the about 13.8 kJ m of infrared external reflection stablizer
-2s
-1, the about 11.6kJ m of infrared external reflection additive
-2s
-1If select wherein two kinds as the heat insulation material that adds, under the defined terms, its surface heat flow is respectively in front: the ceramic microsphere+about 6.2kJm of infrared external reflection stablizer
-2s
-1, the about 5.3kJ m of ceramic microsphere+infrared external reflection additive
-2s
-1Approximately, the about 9.8kJ m of infrared external reflection additive+infrared external reflection stablizer
-2s
-1And the heat flux on the surface of ceramic microsphere+infrared external reflection additive+infrared external reflection stablizer is (4.6 kJ m
-2s
-1).
Cooperate infrared external reflection stablizer, infrared external reflection additive that modification is carried out in thermal radiation absorption aspect, no matter guaranteed that the ceramic thermal insulation coating has good insulation effect at high temperature, normal temperature and low temperature.The internal diameter of ceramic microsphere requires the micron less than 5 (μ m), is preferably nano level less than 100 (nm) nanometer, and unit weight should be less than 200kg/m
3Ceramic microsphere in the ceramic thermal insulation corrosion protection coating relates to micrometer/nanometer yardstick heat transfer theory, it is characterized by:
(1) nearly all hole should be below 100nm in the material, only can have the great-leap-forward of aspect of performance to change less than 100nm because studies show that the cell size of most of nano material, pore size is the main factor of heat-insulating property in thermal insulation material.
(2) pore size more than 80% all should be less than 50nm in the material.Since airborne main component nitrogen and oxygen free path all about 70 (nm) nanometer, therefore only in most of pore size during all less than 50 (nm) nanometer, material internal could the basically eliminate convection current, and transmission of heat by convection is reduced significantly.
(3) material should have very low volume density.The maximum volume density that material allowed can be estimated with following formula:
D
0＝λ
δ·D
t/λ
1
In the formula: D
0The maximum volume density that-material allowed;
D
tThe true density of-material;
λ
δThermal conductivity during the normal temperature of-" no convection current air ";
λ
1-this material void content is 0 o'clock a normal temperature thermal conductivity.
With vitreous state SiO
2Be example, suppose certain vitreous state SiO
2, its normal temperature thermal conductivity is 0.35W/ (mk) when void content is 0, true density is 2g/cm
3, the normal temperature thermal conductivity of " no convection current air " is that 0.026W/ (mk) is if with this material preparation nano-porous super thermal insulation material, the maximum volume density D that then this material allowed
0For:
D
0＝λ
δ·D
t/λ
1＝0.026×2.3÷0.35＝0.171g/cm
3
Promptly the maximum volume density of this material should be less than 171kg/m
3
(4) material all should have under the use temperature of normal temperature and setting than " no convection current air " lower thermal conductivity.
Ceramic microsphere should have resistance to elevated temperatures preferably.Consider amalgamation, constructivity and the whole synthesis performance of ceramic thermal insulation coating, the addition of ceramic microsphere should be controlled at the 20-55 mass parts and be advisable.If too high surface strength, sticking power, thermal conductivity and the hydrophobic nature that can influence coating of addition.If the too low meeting of addition does not reach heat insulating effect.Ceramic microsphere can adopt multiple existing ceramic microsphere, the preparation method of the preferred ceramic microsphere of the present invention: with tetraethoxysilance (TEOS) acidifying (adding HCl) preparation colloidal sol, add alkaline matter again (as NH in colloidal sol earlier
4(OH)) regulate pH value to 5-7, and violent stirring, carry out the ageing of a couple of days then, the microcell of network structure is fully connected, obtain the higher gelinite of intensity.With the aqueous tender body washing by soaking repeatedly in water that coagulates of this bag, in ethanol, soak for a long time again after removing various soluble ions, water and ethanol dissolve each other in immersion process, and most water are all replaced by ethanol is mutual in the final gel body, have just obtained the carrier S iO of nanoporous
2Aerogel.Then, utilize supercritical drying, owing under supercritical state, no longer include the interface between gas and the liquid and exist, but become a kind of uniform fluid of boundary between gas and liquid.This fluid is discharged from gel gradually, owing to there is not liquid-vapo(u)r interface, just there is not wicking action yet, therefore just can not cause that gelinite shrinks and structural damage yet, all from gelinite, discharge until whole fluids, obtain at last gassiness, the ultralight aerogel particle with nanostructure.Handle through the nodularization aluminising again and can obtain ceramic microsphere.The medium of supercritical drying adopts CO
2, its critical temperature is 31.0 ℃, pressure is 7.37Mpa.
One or both of the employing of infrared external reflection stablizer silicon carbide, mica powder and pearl powder etc. or three kinds of compositions.It mainly is to form to be bordering on infinite many interface and the modification by the infrared external reflection additive makes thermal radiation drop to minimum through emission, scattering and absorption in coating.According to infrared coating photoabsorption radiation theory, uptake factor A is determined by coating composition.The A value increases, and then the spectral emittance β γ of coating also increases.When adjusting the coating composition, big if its uptake factor becomes, emissivity of coatings β γ will be increased.So make coating in wider wave, have high emittance, must add the material that has the peak absorption value in the broad wavelength band, the enhanced rad surface is in the radiation capacity of this scope.In addition, reduce scattering coefficient S numerical value (the launching base abrasive lapping in the coating is become molecule), also help improving the emittance of coating.Have the peak absorption value in the broad wavelength band by reaching, also require simultaneously its fineness should be more than 600 orders silicon carbide, mica powder and pearl powder reasonable combination.Its optimum mix should be: silicon carbide: mica powder: pearl powder=3: 1.5: 0.5.To guarantee the emittance of ceramic thermal insulation coating.
The infrared external reflection additive is made up of in yttrium oxide, cerium oxide, cupric oxide, zirconium white, aluminum oxide, the oxidation jade or pearl earring two or more.It mainly acts on has infrared shielding, and the efficient of reverberation is very high.Simultaneously its high refractive index that has and high stability can make the ceramic thermal insulation coating that resisting ultraviolet irradiation is arranged and expose to the weather for a long time and cause the aged excellent properties.This additive also uses as stablizer in addition, and it makes the ceramic thermal insulation coating have better structure stability and thermal fatigue resistance, and content of additive has a significant impact the thermal shock resistance of ceramic coating, this and partially stabilized zirconium white (ZrO
2) phase transformation of internal cause trace produces tiny crack, thereby it is relevant to have alleviated thermal stresses.Therefore infrared external reflection content of additive (weight content) should be controlled at about 2 percent.The infrared external reflection additive is preferably selected the yttrium oxide, the cerium oxide that are about 80 (nm) nanometer for use.Yttrium oxide, cerium oxide in about 80 (nm) nanometer and add material synergy and have widely that the optical transmission spectrum can extend to far infrared band from ultraviolet band always like this.Therefore have the effect of infrared shielding, the thermo-efficiency of its reflection is very high, can reach and reduce optical transmission and heat passage effect, produces better heat-blocking action.
According to infrared coating photoabsorption radiation theory, uptake factor A is determined by coating composition.The A value increases, and then the spectral emittance β γ of coating also increases.When adjusting the coating composition, big if its uptake factor becomes, emissivity of coatings β γ will be increased.So make coating that high emittance be arranged in the 8-13.5um wave band, must add the material that this wavelength band has the peak absorption value, the enhanced rad surface is in the radiation capacity of this scope.In addition, reduce scattering coefficient S numerical value (the launching base abrasive lapping in the coating is become molecule), also help improving the emittance of coating.
The infrared emission stablizer and the main mechanism of action of infrared external reflection additive are by being bordering on infinite many interface and by making thermal radiation drop to minimum through reflection, scattering and absorption to ceramic microsphere and the modification of adding material.Infrared external reflection stablizer, infrared external reflection additive and ceramic microsphere all have effect of heat insulation, but they stress face respectively to scattering, reflection and gas heat-transfer, so one is individual, the combination of two or three all has unique heat insulation insulation effect, form the ceramic thermal insulation coating of individual features, the best three of being works in coordination with adiabatic.
Binding agent of the present invention can be multiple Ceramic Composite binding agent, in order to realize that ceramic thermal insulation coating of the present invention has better antiseptic property, preferably form by copolycondensation, form that a kind of weather resisteant is strong, the polymkeric substance of acid and alkali-resistance, salt spray resistance and chemical reagent by high-performance highly-chlorinated polyethylene and Resins, epoxy and silicone resin.This Ceramic Composite binding agent preferably, by high-performance highly-chlorinated polyethylene and Resins, epoxy 15-20 part, silicone resin 5-10 part, coupler 2-5 part, auxiliary agent 8-10 part and solvent composition.The main component of coupler is: silane reagent SA, propyl carbinol, acetate butyl, dibutyl phthalate (DBP), dimethylbenzene and low molecular weight polycaprolactone mill three kinds, four kinds or five kinds of compositions of amine.The general structural formula of silane reagent is: Y-R-S
iX
3, wherein: X is the hydrolization group that is combined on the Siliciumatom, as chloro, methoxyl group, oxyethyl group, acetoxyl group etc.; R is the carbochain with saturated or unsaturated link(age).So when it is distributed on inorganics and the organism interface, be not difficult to play a part between the compatible interface " emulsifying agent " having avidity mutually.Silane reagent is moisture and hydrolysis reaction takes place in the ingress of air at first, and then dehydration reaction formation oligopolymer takes place, the hydroxyl on this oligopolymer and inorganics surface forms hydrogen bond, passes through heat drying, dehydration reaction takes place form the part covalent linkage, net result is that the inorganics surface is covered by silane.For organic system, all have specific functional group in most of molecules and show the characteristic of this polymkeric substance.Chemical reaction takes place with polymer organic functional group in silane reagent, thereby produces coupling effect, and this effect is the most obvious for the thermosetting resin effect that solidification process is accompanied by chemical reaction.When making the ceramic thermal insulation anticorrosion coating material, the whole fusion method that adopts is to add coupler when mixing with organism with inorganics, its principal feature be add material needn't pre-treatment, and the concentration of silane reagent also can be adjusted arbitrarily, organic substrate functional group difference, also different with the speed of response of silane, for example: highly-chlorinated polyethylene is just fast than the speed of response of epoxy group(ing) and aminosilane with the speed of response of aminosilane.Such Ceramic Composite binding agent can form the small ceramic particle that is suspended in the inertia silica-alumina gel, more can be convenient to form the thermal insulation corrosion protection coating.
Preferred above-mentioned Ceramic Composite binding agent and coupler, coupler add with binding agent after can adding the binding agent mixing; Also can add binding agent earlier separately, the back adds coupler separately.Can form ceramic thermal insulation corrosion protection coating of the present invention by two kinds of addition methods.The anticorrosion mechanism of ceramic thermal insulation corrosion protection coating is because the silane reagent SA in the coupler can form trialkylated silanol after hydrolysis, can interreaction generate the crosslinked fine and close netted hydrophobic membrane of one deck between the alcoholic extract hydroxyl group, because there is the functional group that can react with resin on this film surface, therefore can improve greatly paint film adhesion, anticorrosive, friction resistant, shock proof ability also improve thereupon.Simultaneously, because silane film itself is hydrophobic, just has certain preservative effect, and be directly proportional with the compactness extent of film.We have also carried out a large amount of experiments and research to the ceramic thermal insulation corrosion protection coating to steel substrate surface processing aspect, and relevant experimental result and phosphate coat effect comparison proved its superiority, as the processing of different metal substrate ceramic thermal-insulation anticorrosion coating system and molysite phosphatization, zinc phosphide and chromate treating are made comparisons, find that the outstanding feature that ceramic thermal insulation corrosion protection coating system is handled is: a. does not need japanning can reach preservative effect; B. to compare technology simple with phosphating process, can not produce the waste water that contains heavy metal, and environment is good; C. improved the sticking power of paint film by microcosmic " molecule bridge " at base material.By GB680-86 the solidity to corrosion of SA film is carried out pittingtest; Utilize comprehensive electrochemical test, in 3%NaCl solution, carry out the galvanic corrosion velocity test of SA film with polarized potential control mode at the uniform velocity: with 45 ° of infrared reflection-absorption spectroscopy technical testings the composition structure of SCA rete on the base material, the composition structure and the coverage degree of film confirmed in the XRF energy spectrum analysis.The result shows: rotproofing is effective and feasible to SA to steel surface, by x-ray photoelectron power spectrum that the SA rete is carried out and reflection absorption ftir spectroscopy analytical proof film the coating and the valence bond cooperation of iron-based are used, the impregnation method coat-thickness that the elliptical light spectrometry is surveyed is 82nm, what SA film and base material were further verified in galvanic corrosion speed trial and copper sulfate pittingtest combines effect and preservative effect, and its antiseptic property reaches or is better than phosphatize phosphate coat and contrasts index accordingly.
It is in titanium oxide, zirconium white, nickel based metal compound and Zirconium oxide fibre, the sepiolite fibre two kinds, three kinds or four kinds that ceramic thermal insulation protective system of the present invention compound added material.With the zirconium white is example: zirconium white has in the stupalith near the thermal expansivity of metallic substance, and zirconic thermal expansivity is 11 * 10 in the time of 1000 ℃
-6℃
-1, and the mean thermal expansion coefficients of nickel based metal compound is 17 * 10
-6℃
-1But the thermal conductivity of this material is Al
2O
3About 1/100; This material has higher bending strength and fracture toughness property, and distinctive tiny crack of especially partially stabilized zirconium white and transformation toughening mechanism make thermal shock resistance very good.
The present invention compared with the prior art, ceramic thermal insulation coating of the present invention (ceramic insulationcoatings) is a kind of high-performance, high-quality reflection type thermal insulation coating, this material is to be made of some small ceramic particles that are suspended in the inertia silica-alumina gel, this material has the thermal property of high-reflectivity, high radiant rate, low thermal conductivity, low heat storage coefficient, has remarkable heat insulating function, by the very thin one deck (0.3-0.5mm) of heat insulation object surfaces spraying, just can reach good effect of heat insulation.
Confirm after testing:
Heat reflectivity: 80-84% (visible region)
60-80% (near-infrared region)
Thermal emissivity rate: 89-90%
Coating thermal resistance: 20-100 (more than the 0.3mm) unit?
In addition, this material can also have ventilative, and ponding is impermeable, and good weather-proof, acid and alkali-resistance, salt spray resistance, protection against corrosion, anti-condensation, mould proof, performance, unharmful substance composition, cured article content height such as antiultraviolet is aging arranged, ductility, tack are good, easy construction etc.
Confirm after testing:
Accelerated deterioration: not efflorescence of＞500h, nondiscoloration.
Salt spray resistance experiment: not efflorescence of＞500h, nondiscoloration.
Solid content: 85%
Ductility: 65%
Sticking power: 〉=0.48mpa (cement surface)
〉=0.39mpa (iron plate surface)
So the excellent in performance index that ceramic thermal insulation coating of the present invention has is as follows:
1, heat reflectivity: 80-84% (visible region)
60-80% (near-infrared region)
2, thermal emissivity rate: 89-90%
3, use temperature :-120 ℃-400 ℃
4, proportion: 0.584
5, solid content: 85%
6, sticking power: 0.4mpa
7, pH value: 7-8
8, ductility: 65%
9, antifungal property: 10 grades (10 grades is highest)
10, accelerated deterioration experiment: above 500 hours
11, salt fog senile experiment: above 500 hours
12, washability number of times: 〉=1000 times
13, combustibility: do not fire
The main range of application of ceramic thermal insulation corrosion protection coating:
Tubing system: comprise the high and low temperature pipeline; Water supply pipe; Transition pipeline; Oxygen and freonll-11 pipeline; The thermal insulation of air-conditioning air supply duct etc. and anti-condensation.
Equipment and container: comprise boiler, kiln, chemical device, oil and gas equipment, petrochemical equipment, roasting plant, heating installation, refrigerating apparatus, heat recovery equipment, metallurgy and mechanical means, electrical equipment, medical facilities, transport container, distiller, interchanger, fuel tank, oil tank, basin, dangerous goods container, freezer, refrigerator car etc. adiabatic and prevent condensation.
Personal protection: be used for the thermal insulation on the surface in machinery equipment or other high/low temperature places, prevent the personnel's injuries (as the boiler exterior wall) that produce owing to contacted high/low temperature.
Architectural and other: can be used as heat-insulation and heat-preservation, moisture-proof barrier is on industry and covil construction; Car, ship, freight container and other need to use on the adiabatic place, have suitable corrosion-resisting function simultaneously.
The ceramic thermal insulation corrosion protection coating has good tack, and easy construction can be in following cleaning, and dry surface is used: steel, cast iron, zinc-plated, aluminium, glass fibre, copper, yarn fabric, stainless steel, stone, pitch, urethane, polypropylene, foam (sponge), synthetic glass, masonite, magnesium, plastics, asbestos, wood fibre board, painted surface etc.
Specific embodiment:
Embodiment one, a kind of ceramic thermal insulation coating are by 40 parts of part by weight ceramic microspheres, and 20 parts of binding agents add 40 parts of compositions of material.The thermal resistance that forms is 7kJ m
-2s
-1
Embodiment two, a kind of ceramic thermal insulation coating are by 50 kilograms of ceramic microspheres, and 35 kilograms of binding agents add 35 kilograms of compositions of material, the infrared external reflection stablizer that added weight is 8 kilograms.Two or three of infrared external reflection stablizer silicon carbide, mica powder and pearl powders etc. are formed.Its surface heat flow average out to after testing: 6.2kJ m
-2s
-1
Embodiment three, a kind of ceramic thermal insulation coating are by 30 kilograms of ceramic microspheres, and 28 kilograms of binding agents add 10 kilograms in material, add 5 kilograms infrared external reflection additive.The infrared external reflection additive is made up of in yttrium oxide, cerium oxide, cupric oxide, zirconium white, aluminum oxide, the oxidation jade or pearl earring two or more.Through surveying the heat flux average out to 5.3kJ m on surface
-2s
-1
Embodiment four, a kind of ceramic thermal insulation coating are by 20 kilograms of ceramic microspheres, and 40 kilograms of binding agents add 20 kilograms of formations of material, add 10 kilograms infrared external reflection stablizer and 5 kilograms infrared external reflection additive.The infrared external reflection additive is to be made of yttrium oxide, cerium oxide.The infrared external reflection stablizer is made of silicon carbide, mica powder.The heat flux of such ceramic thermal insulation coating surface is 4.5kJ m
-2s
-1
Embodiment five, a kind of ceramic thermal insulation protective system of the present invention use at certain chemical plant ammonia chloride reactor.The working temperature of reactor is 105 ℃, and the reactor material is a low-carbon alloy steel, adopts ceramic thermal insulation corrosion protection coating of the present invention (A type), average brushing 3mm is thick, the point type electronic thermometer is adopted in its appearance temperature survey, measures 10 points altogether, and average appearance temperature is 42 ℃.
Ceramic thermal insulation coating weight proportioning of the present invention is mixed as follows:
| The starting material name of an article | Mass ratio row (part or kilogram) |
| 1, Ceramic Composite binding agent | ????25 |
| 2, auxiliary agent dibutyl phthalate (DBP) | ????5 |
| 3, infrared external reflection adds 8 doses (80nm) | ????3 |
| 4, infrared external reflection stablizer (100nm-1um | ????5 |
| 5, ceramic microsphere (100nm-1um) | ????20 |
| 6, the compound material that adds | ????20 |
| 7, solvent | ????20 |
| 8, coupler | ????7 |
The Ceramic Composite binding agent is prepared by following weight proportion: by 7.5 kilograms of high-performance highly-chlorinated polyethylenes, and 5 kilograms of silicone resins, 10 kilograms of compositions of 2.5 kilograms of auxiliary agent dibutyl phthalate (DBP)s and solvent.At first in 30-50 ℃ reactor, add solvent, add the high-performance highly-chlorinated polyethylene again and be stirred to it dissolve fully till.Add auxiliary agent then and stir, add silicone resin afterwards and be warming up to 80 ℃ and keep getting final product in about 50 minutes.
The infrared external reflection stablizer is prepared by following proportioning:
Silicon carbide: mica powder: pearl powder=3: 1.5: 0.5 mixes the starting material of proportional quantity with internal mixer.
The infrared external reflection stablizer is prepared in following proportioning: cupric oxide, zirconium white, aluminum oxide, oxidation jade or pearl earring were in 2: 10: 2: 1 ratio mixes in internal mixer.
The compound material that adds is prepared in following proportioning: titanium oxide, nickel based metal compound and sepiolite fibre mix in internal mixer in 5: 10: 5 ratio.
Coupler is prepared by following proportioning: silane reagent SA (KH550), propyl carbinol, dibutyl phthalate (DBP) and dimethylbenzene were by 15%: 5%: 20%: 60% forms.
Embodiment six, a kind of ceramic thermal insulation coating of the present invention are used for the external coating (EC) of certain alkali factory calcining furnace,
End flue temperature is 338 ℃, brushing ceramic thermal insulation corrosion protection coating (Type B), and it is thick on average to brush 7mm,
The point type electronic thermometer is adopted in its appearance temperature survey, measures 10 points altogether, average appearance temperature
It is 53 ℃.Ceramic thermal insulation coating weight proportioning of the present invention (unit kilogram) is mixed as follows:
| 1, Ceramic Composite binding agent | ????40 |
| 2, auxiliary agent tbp | ????8 |
| 3, infrared external reflection additive (80nm) | ????2 |
| 4, infrared external reflection stablizer (100nm-1um | ????3 |
| 5, ceramic microsphere (100nm-1um) | ????25 |
| 6, the compound material that adds | ????15 |
| 7, solvent | ????15 |
| 8, coupler | ????5 |
| 9, transforming agent | ????3 |
The Ceramic Composite binding agent is prepared by following proportioning:
Resins, epoxy 30%, silicone resin 30%, auxiliary agent (dibutyl phthalate (DBP)) 10% and solvent (xylene solvent) 30% are formed.At first in 50 ℃ reactor, add solvent, add Resins, epoxy again and be stirred to it dissolve fully till.Add auxiliary agent then and stir, add silicone resin afterwards and be warming up to 85-90 ℃ and keep getting final product in about 30 minutes.
The infrared external reflection stablizer is prepared by following proportioning:
Silicon carbide: mica powder: pearl powder=3: 1.5: 0.5 mixes the starting material of proportional quantity with internal mixer.
The infrared external reflection stablizer is prepared in following proportioning: cerium oxide, zirconium white, yttrium oxide, oxidation jade or pearl earring were in 2: 10: 2: 1 ratio mixes in internal mixer.
The compound material that adds is prepared in following proportioning: titanium oxide, nickel based metal compound, zirconium white yttrium, Zirconium oxide fibre were in 5: 10: 5: 5 ratio mixes in internal mixer.
Coupler is prepared by following proportioning: silane reagent SA (KH560), low molecular weight polycaprolactone mill amine, dibutyl phthalate (DBP), acetate butyl and dimethylbenzene by 15%: 5%: 10%: 10%: 60% composition.
Transforming agent is prepared in following proportioning: boric acid, borax, aluminium hydroxide mix in the closed grinder-mixer in 1: 1: 2 ratio.
Embodiment seven, a kind of ceramic thermal insulation protective system of the present invention are coated with, and are used for the cooling reaction tower in certain ammonium chloride workshop, chemical plant.Temperature is-13 ℃ in the tower, adopts the present invention thick by following form preparation blended ZW-100A ceramic thermal insulation protective system brushing 2mm, and the workshop room temp is+20 ℃, does not find frosting phenomenon through trimestral operation
| The starting material name of an article | Quality proportioning (part or kilogram) |
| 1, Ceramic Composite binding agent | ????15 |
| 2, auxiliary agent dibutyl phthalate (DBP) | ????7 |
| 3, infrared external reflection additive (80nm) | ????5 |
| 4, infrared external reflection stablizer (100nm-1um | ????9 |
| 5, ceramic microsphere (100nm-1um) | ????48 |
| 6, the compound material that adds | ????6 |
| 7, solvent | ????25 |
| 8, coupler | ????3 |
The Ceramic Composite binding agent is prepared by following proportioning: high-performance highly-chlorinated polyethylene 30%, and silicone resin 20%, auxiliary agent dibutyl phthalate (DBP) 10% and solvent 40% are formed.At first in 30-50 ℃ reactor, add solvent 25%, add the high-performance highly-chlorinated polyethylene again and be stirred to it dissolve fully till.Add auxiliary agent then and stir, add silicone resin afterwards and be warming up to 80 ℃ and keep getting final product in about 50 minutes.
The infrared external reflection stablizer is by the preparation of following proportioning: silicon carbide: pearl powder=3: 1.5 mixes the starting material of proportional quantity with internal mixer.
The infrared external reflection stablizer is prepared in following proportioning: cupric oxide, zirconium white, aluminum oxide, mix in internal mixer in 2: 10: 1 ratios.
The compound material that adds is prepared in following proportioning: titanium oxide and sepiolite fibre mix in internal mixer in 15: 5 ratio.
Coupler is prepared by following proportioning: silane reagent SA (KH550), propyl carbinol, dibutyl phthalate (DBP) and dimethylbenzene were by 15%: 5%: 20%: 60% forms.
Claims (10)
1, a kind of ceramic thermal insulation coating is characterized in that: contain ceramic microsphere 20-55 part by weight proportion, binding agent 15-40 part is added material 5-40 part.
2, as the said ceramic thermal insulation coating of claim 1, it is characterized in that: the infrared external reflection stablizer that adds 5-10 part, the infrared external reflection stablizer is a kind of by silicon carbide, mica powder, pearl powder etc., two or three form, perhaps 2-5 part infrared external reflection additive, the infrared external reflection additive is made up of in yttrium oxide, cerium oxide, cupric oxide, zirconium white, the aluminum oxide two or more, perhaps adds infrared external reflection stablizer and 2-5 part infrared external reflection additive of 5-10 part simultaneously.
3, as the said ceramic thermal insulation coating of claim 1, it is characterized in that: the internal diameter of ceramic microsphere requires the micron less than 5 (μ m), is preferably nano level less than 100 (nm) nanometer, and unit weight should be less than 200kg/m
3
4, as the said ceramic thermal insulation coating of claim 3, it is characterized in that: the pore size in the ceramic microsphere material more than 80% is less than 50 (nm) nanometer.
5, as the said ceramic thermal insulation coating of claim 2, it is characterized in that: the infrared external reflection additive is yttrium oxide, the cerium oxide about 80 (nm) nanometer.
6, as claim 1 or 2 or 3 or 4 or 5 said ceramic thermal insulation coating, it is characterized in that: the Ceramic Composite binding agent is by high-performance highly-chlorinated polyethylene and Resins, epoxy 15-20 part, silicone resin 5-10 part, coupler 2-5 part, auxiliary agent 8-10 part and solvent composition.
7, as the said ceramic thermal insulation coating of claim 6, it is characterized in that: the main component of coupler is three kinds, four kinds or five kinds of compositions that silane reagent SA, propyl carbinol, acetate butyl, dibutyl phthalate (DBP), dimethylbenzene and low molecular weight polycaprolactone mill amine, and the general structural formula of silane reagent is: Y-R-S
iX
3, wherein: X is the hydrolization group that is combined on the Siliciumatom, as chloro, methoxyl group, oxyethyl group, acetoxyl group etc.; R is the carbochain with saturated or unsaturated link(age).
8, as claim 1 or 2 said ceramic thermal insulation coating, it is characterized in that: adding material is two or three in titanium oxide, zirconium white, nickel based metal compound and Zirconium oxide fibre, the sepiolite fibre or four kind for the compound material that adds.
9, as the said ceramic thermal insulation coating of claim 1, it is characterized in that: transforming agent is made up of boric acid, borax, aluminium hydroxide and Tai-Ace S 150, barium aluminum borate etc. two kinds or three kinds or four kinds.
10, the preparation method of ceramic microsphere prepares colloidal sol with the tetraethoxysilance acidifying earlier, adds alkaline matter again and regulate pH value to 5-7 in colloidal sol, and stir, and carries out ageing then, and the microcell of network structure is fully connected, and obtains the higher gelinite of intensity; With the aqueous gelinite of this bag washing by soaking repeatedly in water, in ethanol, soak for a long time again after removing various soluble ions, water and ethanol dissolve each other in immersion process, and most water are all replaced by ethanol is mutual in the final gel body, have just obtained the carrier S iO of nanoporous
2Aerogel; Join supercritical CO then
2Drying is all discharged from gelinite until whole fluids, obtains gassinessly at last, and the ultralight aerogel particle with nanostructure is handled through the nodularization aluminising and can be obtained ceramic microsphere.
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| CNB03111167XA CN100335568C (en) | 2003-03-12 | 2003-03-12 | Ceramic thermal insulative pigment |
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