CN105860612A - Energy-saving paint resistant to high temperature and high infrared radiation and preparation method thereof - Google Patents

Energy-saving paint resistant to high temperature and high infrared radiation and preparation method thereof Download PDF

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Publication number
CN105860612A
CN105860612A CN201610413741.1A CN201610413741A CN105860612A CN 105860612 A CN105860612 A CN 105860612A CN 201610413741 A CN201610413741 A CN 201610413741A CN 105860612 A CN105860612 A CN 105860612A
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parts
high temperature
temperature resistant
radiation energy
saving coating
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CN105860612B (en
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俞家红
王贵祥
陈卓
汤红运
陈国良
于永琪
孙娜丽
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China Triumph International Engineering Co Ltd
Anhui Huaguang Photoelectricity Materials Technology Group Co Ltd
Shenzhen Triumph Technology Engineering Co Ltd
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China Triumph International Engineering Co Ltd
Anhui Huaguang Photoelectricity Materials Technology Group Co Ltd
Shenzhen Triumph Technology Engineering Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D1/00Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D101/00Coating compositions based on cellulose, modified cellulose, or cellulose derivatives
    • C09D101/08Cellulose derivatives
    • C09D101/26Cellulose ethers
    • C09D101/28Alkyl ethers
    • C09D101/286Alkyl ethers substituted with acid radicals
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D103/00Coating compositions based on starch, amylose or amylopectin or on their derivatives or degradation products
    • C09D103/04Starch derivatives
    • C09D103/08Ethers
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D129/00Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Coating compositions based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Coating compositions based on derivatives of such polymers
    • C09D129/02Homopolymers or copolymers of unsaturated alcohols
    • C09D129/04Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40Additives
    • C09D7/60Additives non-macromolecular
    • C09D7/61Additives non-macromolecular inorganic
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/10Process efficiency

Abstract

The invention relates to an energy-saving paint resistant to high temperature and high infrared radiation. The energy-saving paint resistant to high temperature and high infrared radiation is characterized by being prepared from, by weight, 40-100 parts of a radiation agent, 150-320 parts of filler and 72-180 parts of a binder. The radiation agent and the filler are weighed according to a proportion and premixed, then the mixture and the binder are subjected to high-shear mixing and dispersing, then micro-nano grinding and dispersing are carried out, and the energy-saving paint resistant to high temperature and high infrared radiation is obtained. The infrared radiance of the paint is kept within 0.85-0.95 at high temperature, and thus the paint can be widely applied to various kilns and can effectively improve the heat efficiency of kilns.

Description

A kind of high temperature resistant infrared high-radiation energy-saving coating and preparation method thereof
Technical field:
The present invention relates to a kind of coating, be exactly a kind of high temperature resistant infrared high-radiation energy-saving coating and preparation method thereof specifically.
Background technology:
Infrared radiative energy-saving coating is a kind of inorganic coating at infrared band with high radiant rate, is widely used in military affairs, boat My god, the industry such as metallurgical, coloured and refractory material manufacture, be mainly used in absorbing and radiant heat energy, blocking heat source dispel the heat through body, It is a kind of novel heat radiation and energy-saving material.Stove, after application infrared radiative energy-saving coating, can strengthen the spoke within stove Penetrate heat transfer, be effectively improved efficiency of utilization and product quality, the yield of stove, the refractory material of stove matrix is played certain Protective effect, extends the service life of stove kiln body, and can also reduce the discharge of carbon dioxide, produces environmental protection effect.
Existing infrared radiative energy-saving coating is many based on metal oxide, be mainly used in operating temperature 1400 DEG C with Under high-temperature service, and all achieve certain energy-saving effect;But meanwhile, existing infrared radiative energy-saving coating is in hot environment During lower work, can produce that radiance declines with the rising of operating temperature, disbonding, coating have certain pollution to product Deng impact, and its operating temperature needs further to be improved.
Summary of the invention:
The present invention is contemplated to overcome deficiency of the prior art, it is provided that a kind of composition is simple, easy high temperature resistant of preparation process Infrared high-radiation energy-saving coating and preparation method thereof.
The present invention offers an opinion technical scheme:
A kind of high temperature resistant infrared high-radiation energy-saving coating, it is characterised in that: it includes the raw material radiation agent 40-of following parts by weight 100 parts, filler 150-320 part, binding agent 72-180 part;Described radiation agent includes following weight proportion: silicon boride 7 parts-15 parts, Titanium boride 15 parts-25 parts, strontium boride 3 parts-8 parts, hafnium boride 4 parts-10 parts, boronation europium 3 parts-5 parts, 8 parts-25 parts of carborundum, carbon Change tantalum 2 parts-5 parts, hafnium carbide 1 part-6 parts, chromium carbide 3 parts-10 parts.
On the basis of technique scheme, it is also possible to have a techniques below scheme:
Described filler include silica flour, tabular alumina, magnesia, calcium oxide, boron oxide, kaolin, bentonite, clay, One or more mixture in yttrium stable zirconium oxide.
Described binding agent includes that Ludox, Alumina gel, zirconium colloidal sol, aluminium dihydrogen phosphate, carboxymethylcellulose calcium, carboxymethyl form sediment One or more mixture in powder, poly-vinyl alcohol solution.
In described radiation agent and filler the particle diameter of all solids powder all >=2500 mesh.
Grain diameter in described Ludox, Alumina gel and zirconium colloidal sol all≤60nm.
The preparation method of a kind of high temperature resistant infrared high-radiation energy-saving coating, it is characterised in that it comprises the following steps: a, general Radiation agent and filler weigh proportioning premixing 10-60min, compound then carries out fine and processes 2-4 time, obtain radiating agent Ultra-fine mixed powder with filler;
B, the binding agent after ultra-fine mixed powder and proportioning is together put into high shear dispersion machine is carried out disperse 20~40min, Gained is delivered in nanometer sand mill carry out micro-nanoization more repeatedly grind 2-6 time, makes the thickness with certain fluidity Shape suspension, obtains high temperature resistant infrared high-radiation energy-saving coating.
Particle mean size≤2 μm of the high temperature resistant infrared high-radiation energy-saving coating prepared.
It is an advantage of the current invention that:
It is simple that the present invention has raw material composition, and preparation process is easy, and the infrared emittance under 1500 DEG C~1700 DEG C of high temperature It is maintained at 0.85~0.95, after the inner surface of stove sprays 0.1mm~0.5mm thickness, significant energy-saving effect can be produced, and Do not produce radiance to reduce, come off and the impact such as polluted product, it is adaptable to different types of various stoves.
Detailed description of the invention:
Below in conjunction with embodiment, the present invention will be further described in detail.
Embodiment 1
A kind of high temperature resistant infrared high-radiation energy-saving coating, each component is according to following composition by weight proportioning: radiation agent 100 parts, filler 150 parts, binding agent 126 parts.
Above-mentioned radiation agent is made up of each raw material of following composition by weight: silicon boride 15 parts, titanium boride 25 parts, strontium boride 4 parts, Hafnium boride 10 parts, boronation europium 5 parts, 25 parts of carborundum, ramet 3 parts, hafnium carbide 3 parts, chromium carbide 10 parts.
Above-mentioned filler is made up of each raw material of following composition by weight: silica flour 130 parts, boron oxide 10 parts, bentonite 10 parts.
Above-mentioned binding agent is made up of each raw material of following composition by weight: Ludox 100 parts, carboxymethylcellulose calcium 10 parts, poly- Vinyl alcohol 16 parts.
A kind of preparation method of high temperature resistant infrared high-radiation energy-saving coating, it comprises the following steps: a, by radiation agent with fill out Material weighs after proportioning, is pre-mixed 50min, then fine 2 times;
B, then the binding agent after the ultra-fine mixed powder obtained and proportioning is together put in high shear dispersion machine disperse 30min, then gained is inputted repeatedly in nanoscale sand mill carry out micro-nanoization grind 5 times, make and there is certain fluidity Thick suspension, obtains the high temperature resistant infrared high-radiation energy-saving coating of average grain diameter≤0.5 μm.
High temperature resistant infrared high-radiation energy-saving coating in the present embodiment, is coated in the inner surface of stove, is dried and solidifies shape Becoming infrared high radiation coating thick for 0.5mm, the radiance at 1500 DEG C, 1600 DEG C and 1700 DEG C is respectively 0.87,0.91 and 0.94。
Embodiment 2
A kind of high temperature resistant infrared high-radiation energy-saving coating, each component is according to following composition by weight proportioning: radiation agent 46 parts, filler 235 parts, binding agent 180 parts.
Above-mentioned radiation agent is made up of each raw material of following composition by weight: silicon boride 7 parts, titanium boride 15 parts, strontium boride 3 parts, Hafnium boride 4 parts, boronation europium 3 parts, 8 parts of carborundum, ramet 2 parts, hafnium carbide 1 part, chromium carbide 3 parts.
Above-mentioned filler is made up of each raw material of following composition by weight: silica flour 150 parts, tabular alumina 30 parts, magnesia 5 Part, 5 parts of calcium oxide, kaolin 30 parts, bentonite 15 parts.
Above-mentioned binding agent is made up of each raw material of following composition by weight: Ludox 130 parts, Alumina gel 30 parts, polyvinyl alcohol 10 parts, CMS 10 parts.
A kind of preparation method of high temperature resistant infrared high-radiation energy-saving coating, it comprises the following steps: a, by radiation agent with fill out Material weighs after proportioning, is pre-mixed 35min, then fine 4 times;Then by the binding agent after the ultra-fine mixed powder obtained and proportioning Together put into and high shear dispersion machine is carried out disperse 20min;
Gained is inputted repeatedly in nanoscale sand mill the most again and carry out micro-nanoization grinding 4 times, make and there is certain fluidity Thick suspension, obtain the high temperature resistant infrared high-radiation energy-saving coating of average grain diameter≤1 μm.
High temperature resistant infrared high-radiation energy-saving coating in the present embodiment, is coated in the inner surface of stove, is dried and solidifies shape Becoming infrared high radiation coating thick for 0.4mm, the radiance at 1500 DEG C, 1600 DEG C and 1700 DEG C is respectively 0.85,0.89 and 0.92。
Embodiment 3
A kind of high temperature resistant infrared high-radiation energy-saving coating, each component is according to following composition by weight proportioning: radiation agent 70 parts, filler 296 parts, binding agent 72 parts.
Above-mentioned radiation agent is made up of each raw material of following composition by weight: silicon boride 7 parts, titanium boride 18 parts, strontium boride 8 parts, Hafnium boride 10 parts, boronation europium 4 parts, 10 parts of carborundum, ramet 3 parts, hafnium carbide 6 parts, chromium carbide 4 parts.
Above-mentioned filler is made up of each raw material of following composition by weight: silica flour 200 parts, boron oxide 12 parts, kaolin 55 parts, Clay 19 parts, yttrium stable zirconium oxide 10 parts.
Above-mentioned binding agent is made up of each raw material of following composition by weight: Ludox 52 parts, zirconium colloidal sol 10 parts, aluminium dihydrogen phosphate 5 parts, carboxymethylcellulose calcium 5 parts.
A kind of preparation method of high temperature resistant infrared high-radiation energy-saving coating, it comprises the following steps: a, by radiation agent with fill out Material weighs after proportioning, is pre-mixed 10min, then fine 3 times;
B, then the binding agent after the ultra-fine mixed powder obtained and proportioning is together put in high shear dispersion machine disperse 40min;Gained is inputted repeatedly in nanoscale sand mill the most again and carry out micro-nanoization grinding 3 times, make and there is certain flowing The thick suspension of property, obtains the high temperature resistant infrared high-radiation energy-saving coating of average grain diameter≤0.5 μm.
High temperature resistant infrared high-radiation energy-saving coating in the present embodiment, is coated in the inner surface of stove, is dried and solidifies shape Becoming infrared high radiation coating thick for 0.3mm, the radiance at 1500 DEG C, 1600 DEG C and 1700 DEG C is respectively 0.87,0.90 and 0.92。
Embodiment 4
A kind of high temperature resistant infrared high-radiation energy-saving coating, each component is according to following composition by weight proportioning: radiation agent 64 parts, filler 193 parts, binding agent 90 parts.
Wherein radiation agent be made up of each raw material of following composition by weight: silicon boride 12 parts, titanium boride 15 parts, strontium boride 6 parts, Hafnium boride 5 parts, boronation europium 3 parts, 8 parts of carborundum, ramet 5 parts, hafnium carbide 4 parts, chromium carbide 3 parts.
Above-mentioned filler is made up of each raw material of following composition by weight: silica flour 158 parts, tabular alumina 10 parts, magnesia 8 Part, 7 parts of calcium oxide, bentonite 10 parts.
Above-mentioned binding agent is made up of each raw material of following composition by weight: Ludox 60 parts, Alumina gel 10 parts, aluminium dihydrogen phosphate 10 parts, carboxymethylcellulose calcium 5 parts, polyvinyl alcohol 5 parts.
A kind of preparation method of high temperature resistant infrared high-radiation energy-saving coating, it comprises the following steps: a, by radiation agent with fill out Material weighs after proportioning, is pre-mixed 60min, then fine 3 times;
B, then the binding agent after the ultra-fine mixed powder obtained and proportioning is together put in high shear dispersion machine disperse 25min;Gained is inputted repeatedly in nanoscale sand mill the most again and carry out micro-nanoization grinding 4 times, make and there is certain flowing The thick suspension of property, obtains the high temperature resistant infrared high-radiation energy-saving coating of average grain diameter≤0.2 μm.
High temperature resistant infrared high-radiation energy-saving coating in the present embodiment, is coated in the inner surface of stove, is dried and solidifies shape Becoming infrared high radiation coating thick for 0.3mm, the radiance at 1500 DEG C, 1600 DEG C and 1700 DEG C is respectively 0.88,0.92 and 0.95。
Embodiment 5
A kind of high temperature resistant infrared high-radiation energy-saving coating, each component is according to following composition by weight proportioning: radiation agent 80 parts, filler 320 parts, binding agent 168 parts.
Above-mentioned radiation agent is made up of each raw material of following composition by weight: silicon boride 14 parts, titanium boride 25 parts, strontium boride 6 parts, Hafnium boride 4 parts, boronation europium 3 parts, 16 parts of carborundum, ramet 4 parts, hafnium carbide 1 part, chromium carbide 7 parts.
Above-mentioned filler is made up of each raw material of following composition by weight: silica flour 190 parts, tabular alumina 60 parts, boron oxide 20 parts, kaolin 10 parts, clay 12 parts, yttrium stable zirconium oxide 28 parts.
Above-mentioned binding agent is made up of each raw material of following composition by weight: Ludox 107 parts, Alumina gel 13 parts, zirconium colloidal sol 8 Part, polyvinyl alcohol 25 parts, CMS 15 parts.
A kind of preparation method of high temperature resistant infrared high-radiation energy-saving coating, it comprises the following steps: a, by radiation agent with fill out Material weighs after proportioning, is pre-mixed 25min, then fine 3 times;
B, then the binding agent after the ultra-fine mixed powder obtained and proportioning is together put in high shear dispersion machine disperse 35min, repeatedly inputs gained in nanoscale sand mill and carries out micro-nanoization grinding 2 times, makes and has certain flowing The thick suspension of property, obtains the high temperature resistant infrared high-radiation energy-saving coating of average grain diameter≤1 μm.
High temperature resistant infrared high-radiation energy-saving coating in the present embodiment, is coated in the inner surface of stove, is dried and solidifies shape Becoming infrared high radiation coating thick for 0.4mm, the radiance at 1500 DEG C, 1600 DEG C and 1700 DEG C is respectively 0.89,0.93 and 0.95。
Embodiment 6
A kind of high temperature resistant infrared high-radiation energy-saving coating, each component is according to following composition by weight proportioning: radiation agent 75 parts, filler 260 parts, binding agent 139 parts.
Above-mentioned radiation agent is made up of each raw material of following composition by weight: silicon boride 8 parts, titanium boride 17 parts, strontium boride 5 parts, Hafnium boride 6 parts, boronation europium 4 parts, 25 parts of carborundum, ramet 4 parts, hafnium carbide 3 parts, chromium carbide 3 parts.
Above-mentioned filler is made up of each raw material of following composition by weight: silica flour 175 parts, 17 parts of magnesia, boron oxide 18 parts, Kaolin 17 parts, bentonite 10 parts, clay 10 parts, yttrium stable zirconium oxide 13 parts.
Above-mentioned binding agent is made up of each raw material of following composition by weight: Ludox 90 parts, Alumina gel 24 parts, carboxymethyl cellulose Element 13 parts, CMS 15 parts.
A kind of preparation method of high temperature resistant infrared high-radiation energy-saving coating, it comprises the following steps: a, by radiation agent with fill out Material weighs after proportioning, is pre-mixed 40min, then fine 2 times;
B, then the binding agent after the ultra-fine mixed powder obtained and proportioning is together put in high shear dispersion machine disperse 40min, repeatedly inputs gained in nanoscale sand mill and carries out micro-nanoization grinding 6 times, makes and has certain flowing The thick suspension of property, obtains the high temperature resistant infrared high-radiation energy-saving coating of average grain diameter≤0.1 μm.
High temperature resistant infrared high-radiation energy-saving coating in the present embodiment, is coated in the inner surface of stove, is dried and solidifies shape Becoming infrared high radiation coating thick for 0.1mm, the radiance at 1500 DEG C, 1600 DEG C and 1700 DEG C is respectively 0.87,0.90 and 0.93。
Described above illustrate and describes some preferred embodiments of the application, but as previously mentioned, it should be understood that the application Be not limited to form disclosed herein, be not to be taken as the eliminating to other embodiments, and can be used for other combinations various, Amendment and environment.And the change that those skilled in the art are carried out and change are without departing from spirit and scope, the most all Ying Ben In the protection domain of application claims.

Claims (7)

1. a high temperature resistant infrared high-radiation energy-saving coating, it is characterised in that: it includes the raw material of following parts by weight, radiates agent 40-100 part, filler 150-320 part, binding agent 72-180 part;Described radiation agent includes following weight proportion: silicon boride 7 part-15 Part, titanium boride 15 parts-25 parts, strontium boride 3 parts-8 parts, hafnium boride 4 parts-10 parts, boronation europium 3 parts-5 parts, 8 parts-25 parts of carborundum, Ramet 2 parts-5 parts, hafnium carbide 1 part-6 parts, chromium carbide 3 parts-10 parts.
2. according to the high temperature resistant infrared high-radiation energy-saving coating of the one described in claim 1, it is characterised in that: described filler Including in silica flour, tabular alumina, magnesia, calcium oxide, boron oxide, kaolin, bentonite, clay, yttrium stable zirconium oxide One or more mixture.
3. according to the high temperature resistant infrared high-radiation energy-saving coating of the one described in claim 1, it is characterised in that: described binding agent Including in Ludox, Alumina gel, zirconium colloidal sol, aluminium dihydrogen phosphate, carboxymethylcellulose calcium, CMS, poly-vinyl alcohol solution One or more mixture.
4. according to the high temperature resistant infrared high-radiation energy-saving coating described in any one of claim 1 or 2, it is characterised in that: described spoke Penetrate in agent and filler the particle diameter of all solids powder all >=2500 mesh.
5. according to the high temperature resistant infrared high-radiation energy-saving coating described in claim 1 or 3, it is characterised in that: described Ludox, aluminium Grain diameter in colloidal sol and zirconium colloidal sol all≤60nm.
6. according to the preparation method of a kind of high temperature resistant infrared high-radiation energy-saving coating described in claim 1, it is characterised in that It comprises the following steps: a, radiation agent and filler are weighed proportioning premixing 10-60min, then compound is carried out fine Process 2-4 time, obtain the ultra-fine mixed powder radiating agent with filler;
B, the binding agent after ultra-fine mixed powder and proportioning is together put into high shear dispersion machine disperses 20~40min, then will Gained is repeatedly delivered in nanometer sand mill carry out micro-nanoization and grinds 2-6 time, makes and has the thick outstanding of certain fluidity Floating fluid, obtains high temperature resistant infrared high-radiation energy-saving coating.
The preparation method of high temperature resistant infrared high-radiation energy-saving coating the most according to claim 6, it is characterised in that: it is prepared into Particle mean size≤2 μm of the high temperature resistant infrared high-radiation energy-saving coating arrived.
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