CN106752915B - Nanoscale metal ceramic solar heat-absorbing coating material and preparation method thereof - Google Patents

Nanoscale metal ceramic solar heat-absorbing coating material and preparation method thereof Download PDF

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CN106752915B
CN106752915B CN201611151293.9A CN201611151293A CN106752915B CN 106752915 B CN106752915 B CN 106752915B CN 201611151293 A CN201611151293 A CN 201611151293A CN 106752915 B CN106752915 B CN 106752915B
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parts
coating material
metal ceramic
absorbent
organic silicon
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CN106752915A (en
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朱燕艳
潘小杰
仇庆林
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Shanghai University of Electric Power
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Abstract

The invention relates to a nano-scale metal ceramic solar heat absorption coating material and a preparation method thereof, wherein the coating material is prepared from the following components in parts by weight: 40-50 parts of organic silicon resin, 2-7 parts of curing agent, 11-12 parts of absorbent, 2-4 parts of absorption enhancer, 33-45 parts of auxiliary agent, 13-17 parts of metal ceramic material and 7-13 parts of heat conduction material, wherein the absorbent is doped modified nano titanium dioxide; the preparation method comprises the steps of constant-temperature pressurization reaction, reflux reaction and reduced-pressure distillation reaction in sequence. Compared with the prior art, the doped modified nano titanium dioxide is adopted as the absorbent and is matched with the absorption enhancer, so that the coating material has excellent solar energy absorption performance, and the metal ceramic material and the heat conduction material with photocatalytic migration performance are adopted, so that the solar energy absorption range can be enlarged, the heat conduction performance of the coating material can be enhanced, the service life of the coating material is longer, the reaction process condition is mild, the production cost is low, and the industrial production is easy to carry out.

Description

Nanoscale metal ceramic solar heat-absorbing coating material and preparation method thereof
Technical Field
The invention belongs to the technical field of solar heat utilization, and relates to a nanoscale metal ceramic solar heat absorption coating material and a preparation method thereof.
Background
Solar heat utilization is an important form of solar energy utilization, and refers to a process of collecting solar radiation energy by a solar heat collector, and converting the solar radiation energy into heat energy through interaction with a substance for utilization. Along with the problem of energy shortage becoming more serious, the country has more and more invested in energy-saving and emission-reducing measures, so that people can study solar heat utilization more and more widely and deeply, and the solar heat utilization has wider development prospect.
The solar heat absorption coating is a core functional part for absorbing light energy in a sunlight absorption system, and is generally used in a solar heat collection element or a solar selective absorption coating system. Good heat absorption efficiency is a basic requirement of solar heat absorption coatings. At present, it is generally adopted in the market to spray a black organic coating, such as black fluorocarbon resin, black epoxy resin, black polyurethane resin, etc., on a heat absorbing plate core of a flat plate collector, and since such a coating uses a common resin material as a binder and common carbon black or black pigment as a color body, the following problems exist: 1. the coating is not weather-resistant and is easy to pulverize and fade too early; 2. the solar flat plate collector has no spectral selectivity, so that the coating emissivity is high, and the thermal efficiency of the solar flat plate collector is low.
In addition, when the existing solar heat-absorbing coating material is prepared, aluminum is selected as a sputtering cathode, and reacts with nitrogen to generate a film in a gradual change film form, and the film is only suitable for being used in a low-temperature vacuum environment and has poor baking resistance; the film prepared by the interference film has better baking resistance than the film prepared by the gradual change film, but the optical constants, the thicknesses and the like of all layers are required to be accurately controlled during preparation, so the preparation process is complex and the raw materials are expensive.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a nanoscale metal ceramic solar heat-absorbing coating material which is good in heat-absorbing performance and easy to prepare and a preparation method thereof.
The purpose of the invention can be realized by the following technical scheme:
a nanoscale metal ceramic solar heat absorption coating material is prepared from the following components in parts by weight: 40-50 parts of organic silicon resin, 2-7 parts of curing agent, 11-12 parts of absorbent, 2-4 parts of absorption enhancer, 33-45 parts of auxiliary agent, 13-17 parts of metal ceramic material and 7-13 parts of heat conduction material, wherein the absorbent is doped modified nano titanium dioxide.
As a preferred technical scheme, the coating material comprises the following components in parts by weight: 42-48 parts of organic silicon resin, 4-5 parts of curing agent, 11-12 parts of absorbent, 2-4 parts of absorption enhancer, 35-40 parts of auxiliary agent, 14-16 parts of metal ceramic material and 9-11 parts of heat conduction material.
The organic silicon resin comprises one or more of epoxy modified organic silicon resin, polyester modified organic silicon resin or high-gloss organic silicon resin. The organic silicon resin belongs to thermosetting materials, has excellent thermal oxidation stability and electrical insulation performance, and has outstanding advantages in the aspects of weather resistance and waterproof performance; in addition, when thermal oxidation occurs, the silicone resin is further condensed to form a highly crosslinked three-dimensional network structure, and weather resistance is further improved.
The curing agent comprises one or more of m-xylylenediamine, diethylamine or diaminodiphenylmethane.
The doped modified nano titanium dioxide is nano titanium dioxide doped with silicon dioxide and calcium carbonate. Titanium dioxide has a good absorption effect on sunlight, but the absorption range is narrow, and the absorption range can be enlarged and shifted to visible light by modifying silicon dioxide and calcium carbonate.
In the doped modified nano titanium dioxide, the mass percent of silicon dioxide is 5-11%, and the mass percent of calcium carbonate is 1-3%.
As a preferable technical scheme, the particle size of the nano titanium dioxide is 50-500nm, the silicon dioxide is nano silicon dioxide, and the calcium carbonate is nano calcium carbonate.
The absorption enhancer is 2-bromo-2- (2-fluorophenyl) -1-cyclopropylethanone. The absorption enhancer can promote absorption and conduction among the nano titanium dioxide while semi-coating the absorbent, and prevent the rapid closing of electrons and holes on the surface of the titanium dioxide.
The auxiliary agent comprises one or two of ethyl acetate or n-heptane. The assistant has good solubility and better volatility, and is beneficial to subsequent reflux and reduced pressure distillation reaction.
The cermet material comprises one or more of tungsten boride cermet material, titanium carbide cermet material or molybdenum silicide cermet material. The metal ceramic material has excellent wear resistance and high temperature resistance, and the raw materials are wide in source and convenient to obtain.
The heat conduction material comprises one or more of graphene, carbon fiber or heat conduction silicone grease.
A preparation method of a nanoscale metal ceramic solar heat absorption coating material specifically comprises the following steps:
(1) mixing organic silicon resin, an absorbent and an absorption enhancer, and reacting for 3-7h at the temperature of 60-80 ℃, the pressure of 7-13MPa and the stirring speed of 800-;
(2) mixing a curing agent and an auxiliary agent, adding the mixture into the reaction solution, and uniformly stirring;
(3) respectively adding a metal ceramic material and a heat conducting material, refluxing for 3-5h at the temperature of 90-105 ℃, the reflux rate of 10-30mL/min and the stirring rate of 400-700r/min, and then carrying out reduced pressure distillation reaction for 1-2h at the temperature of 70-90 ℃ to obtain the nano metal ceramic solar heat absorption coating material.
As a preferable mode, in the reduced pressure distillation reaction in the step (3), the reduced pressure is 60 to 75% of the atmospheric pressure.
The nano powder material is a metastable state intermediate substance with the size of nano order (0.1-100nm) between solid and molecule. With the ultra-fining of the powder, the electronic structure and the crystal structure of the surface of the powder can be changed, and a special effect which is not possessed by the block material is generated. The nano powder material has extremely small particle size, large specific surface area and excellent chemical performance, and also has the following excellent performances: the sintering temperature of the material can be obviously reduced, and energy is saved; the composition structure of the material can be densified and homogenized, the performance of the material is improved, and the use reliability of the material is improved; the components and the structure of the material can be controlled from the structural level (1-100nm) of the nano material, and the potential performance of the material can be fully exerted. According to the invention, the absorbent adopts doped modified nano titanium dioxide, so that the absorption efficiency of the material on solar energy can be obviously improved, the absorption range on solar energy is improved, and meanwhile, the heat conduction efficiency is good.
Cermet material refers to a material in which the metal and ceramic phases in the composite material have an interface in three-dimensional space. The cermet material has the characteristics of high temperature resistance, high strength, small density, easiness in processing, corrosion resistance, good heat conductivity and the like, can enhance the stability, strength, high temperature resistance and corrosion resistance of the heat-absorbing coating, and can improve the heat-conducting property of the heat-absorbing coating so as to prevent the influence of overhigh surface temperature of titanium dioxide on the heat-absorbing property of the heat-absorbing coating material.
Compared with the prior art, the invention has the following characteristics:
1) the doped modified nano titanium dioxide is used as an absorbent, and the 2-bromo-2- (2-fluorophenyl) -1-cyclopropylethanone is used as an absorption enhancer, so that the coating material has excellent solar energy absorption performance and stable performance, and the heat absorption rate of the coating material is improved; the metal ceramic material and the heat conduction material with the photocatalytic migration performance are adopted, so that the solar energy absorption range can be enlarged, the heat conduction performance of the coating material can be enhanced, the local temperature of the coating material is reduced, and the coating material has longer service life;
2) after the corrosion-resistant high-temperature-resistant curing agent is mixed with the organic silicon resin, the coating material has good corrosion resistance, the application field of the coating material is expanded, and the service life of the coating material is prolonged;
3) the preparation method is simple and convenient, the reaction process condition is mild, and the reaction temperature is moderate, so that the damage to the material structure is avoided, the production cost is reduced, and the industrial production is easy to carry out.
Detailed Description
The present invention will be described in detail with reference to specific examples. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Example 1:
a nano-scale metal ceramic solar heat absorption coating material comprises the following formula:
40 parts of organic silicon resin, 2 parts of curing agent, 11 parts of absorbent, 2 parts of absorption enhancer, 33 parts of auxiliary agent, 13 parts of metal ceramic material and 7 parts of heat conducting material. The resin is epoxy modified organic silicon resin; the curing agent adopts m-xylylenediamine; the absorbent adopts nano titanium dioxide doped with silicon dioxide and calcium carbonate, wherein the mass percentage of the silicon dioxide is 5 percent, the mass percentage of the calcium carbonate is 1 percent, the particle size of the nano titanium dioxide is 50nm, and the particle sizes of the silicon dioxide and the calcium carbonate belong to the nano level; the absorption enhancer adopts 2-bromo-2- (2-fluorophenyl) -1-cyclopropylethanone; the auxiliary agent adopts ethyl acetate; the cermet material is tungsten boride ceramic material; the heat conducting agent is graphene.
The preparation method comprises the following steps:
step 1, adding organic silicon resin, an absorbent and an absorption enhancer into a reaction kettle, and carrying out pressurized stirring reaction for 3 hours, wherein the pressure is 7MPa, the stirring speed is 800r/min, and the stirring reaction temperature is 60 ℃;
step 2, uniformly mixing the curing agent and the auxiliary agent, adding the mixture into a reaction kettle, and stirring until the mixture is uniformly mixed;
step 3, adding the heat conduction material and the metal ceramic material into a reaction kettle, and carrying out reflux stirring for 3 hours to obtain a mixed solution, wherein the reflux rate is 10mL/min, the stirring rate is 400r/min, and the reflux temperature is 90 ℃;
and 4, adding the mixed solution obtained in the step 3 into a water bath, and carrying out reduced pressure distillation reaction for 1h to obtain the nano-scale metal ceramic solar heat absorption coating material, wherein the reduced pressure is 60% of the atmospheric pressure, and the temperature of the reduced pressure distillation is 70 ℃.
Example 2:
a nano-scale metal ceramic solar heat absorption coating material comprises the following formula:
50 parts of organic silicon resin, 7 parts of curing agent, 12 parts of absorbent, 4 parts of absorption enhancer, 45 parts of auxiliary agent, 17 parts of metal ceramic material and 13 parts of heat conducting material. The resin is polyester modified organic silicon resin; the curing agent adopts diethylamine; the absorbent adopts nano titanium dioxide doped with silicon dioxide and calcium carbonate, wherein the mass percentage of the silicon dioxide is 11 percent, the mass percentage of the calcium carbonate is 3 percent, the particle size of the nano titanium dioxide is 500nm, and the particle sizes of the silicon dioxide and the calcium carbonate belong to the nano level; the absorption enhancer adopts 2-bromo-2- (2-fluorophenyl) -1-cyclopropylethanone; the auxiliary agent adopts n-heptane; the cermet material is titanium carbide cermet material; the heat conducting agent adopts carbon fiber.
The preparation method comprises the following steps:
step 1, adding organic silicon resin, an absorbent and an absorption enhancer into a reaction kettle, and carrying out pressurized stirring reaction for 7 hours, wherein the pressure is 13MPa, the stirring speed is 1400r/min, and the stirring reaction temperature is 80 ℃;
step 2, uniformly mixing the curing agent and the auxiliary agent, adding the mixture into a reaction kettle, and stirring until the mixture is uniformly mixed;
step 3, adding the heat conduction material and the metal ceramic material into a reaction kettle, and carrying out reflux stirring for 5 hours to obtain a mixed solution, wherein the reflux rate is 30mL/min, the stirring rate is 700r/min, and the reflux temperature is 105 ℃;
and 4, adding the mixed solution obtained in the step 3 into a water bath, and carrying out reduced pressure distillation reaction for 1.5 hours to obtain the nano-scale metal ceramic solar heat absorption coating material, wherein the reduced pressure is 75% of the atmospheric pressure, and the temperature of the reduced pressure distillation is 90 ℃.
Example 3:
a nano-scale metal ceramic solar heat absorption coating material comprises the following formula:
45 parts of organic silicon resin, 5 parts of curing agent, 12 parts of absorbent, 3 parts of absorption enhancer, 39 parts of auxiliary agent, 15 parts of metal ceramic material and 9 parts of heat conduction material. The resin is high-gloss organic silicon resin; the curing agent adopts diaminodiphenylmethane; the absorbent adopts nano titanium dioxide doped with silicon dioxide and calcium carbonate, wherein the mass percentage of the silicon dioxide is 8 percent, the mass percentage of the calcium carbonate is 2 percent, the particle size of the nano titanium dioxide is 300nm, and the particle sizes of the silicon dioxide and the calcium carbonate belong to the nano level; the absorption enhancer adopts 2-bromo-2- (2-fluorophenyl) -1-cyclopropylethanone; the auxiliary agent adopts n-heptane; the cermet material is molybdenum silicide cermet material; the heat conducting agent is heat conducting silicone grease.
The preparation method comprises the following steps:
step 1, adding organic silicon resin, an absorbent and an absorption enhancer into a reaction kettle, and carrying out pressurized stirring reaction for 5 hours, wherein the pressure is 10MPa, the stirring speed is 1200r/min, and the stirring reaction temperature is 75 ℃;
step 2, uniformly mixing the curing agent and the auxiliary agent, adding the mixture into a reaction kettle, and stirring until the mixture is uniformly mixed;
step 3, adding the heat conduction material and the metal ceramic material into a reaction kettle, and carrying out reflux stirring for 3 hours to obtain a mixed solution, wherein the reflux rate is 15mL/min, the stirring rate is 600r/min, and the reflux temperature is 101 ℃;
and 4, adding the mixed solution obtained in the step 3 into a water bath, and carrying out reduced pressure distillation reaction for 2 hours to obtain the nano-scale metal ceramic solar heat absorption coating material, wherein the reduced pressure is 65% of the atmospheric pressure, and the temperature of the reduced pressure distillation is 80 ℃.
Comparative example:
the performance test was carried out using the conventional AlN/Al gradient coating as a comparative example, together with the nano-sized cermet solar heat absorbing coating materials prepared in examples 1 to 3, and the results are shown in the following table:
detecting items Example 1 Example 2 Example 3 Comparative example
Resistivity (omega cm) 41 43 37 50
Viscosity (C)s) 15 16 13 22
Adhesion (1mm) Grade 3 Grade 3 Grade 3 Grade 3
Hardness of pencil 3H 3H 3H 3H
Thickness of film 1800nm 1500nm 1000nm 400nm
Total absorption rate 96.6％ 96.3％ 97.1％ 94％
Total reflection rate 3.4％ 3.7％ 2.9％ 4.2％
In the table, the resistivity is detected by an ohmmeter, the viscosity is measured by a four-cup-coating viscometer, the adhesion is measured by a GB/T9286-.
The data in the table show that the total absorption rate of the nano-scale metal ceramic solar heat-absorbing coating material is more than 95%, and the nano-scale metal ceramic solar heat-absorbing coating material has high heat-absorbing performance; the viscosity of the material measured by coating four cups is below 20s, the leveling property is good, the thickness of a paint film can be effectively controlled, and the heat-absorbing coating is prevented from cracking due to uneven thickness; the resistivity is below 43 omega cm, which shows that the prepared nano metal ceramic solar heat-absorbing coating material is not only suitable for traditional manual painting, roller coating and air spraying, but also suitable for electrostatic spraying, and improves the spraying convenience. In addition, the nano-scale metal ceramic solar heat absorption coating material also has high adhesive force and good use stability.
Example 4:
a nanoscale metal ceramic solar heat absorption coating material is prepared from the following components in parts by weight: 40 parts of organic silicon resin, 7 parts of curing agent, 11 parts of absorbent, 4 parts of absorption enhancer, 33 parts of auxiliary agent, 17 parts of metal ceramic material and 7 parts of heat conducting material.
Wherein the organic silicon resin is epoxy modified organic silicon resin; the curing agent is diethylamine; the absorbent is doped modified nano titanium dioxide, the doped modified nano titanium dioxide is nano titanium dioxide doped with silicon dioxide and calcium carbonate, and in the doped modified nano titanium dioxide, the mass percentage of the silicon dioxide is 7 percent, and the mass percentage of the calcium carbonate is 2 percent; the absorption enhancer is 2-bromo-2- (2-fluorophenyl) -1-cyclopropylethanone; the auxiliary agent is ethyl acetate; the cermet material is titanium carbide cermet material; the heat conducting material is graphene.
A preparation method of a nanoscale metal ceramic solar heat absorption coating material specifically comprises the following steps:
(1) mixing organic silicon resin, an absorbent and an absorption enhancer, and reacting for 7 hours at the temperature of 80 ℃, the pressure of 7MPa and the stirring speed of 1400r/min to obtain a reaction solution;
(2) mixing a curing agent and an auxiliary agent, adding the mixture into the reaction solution, and uniformly stirring;
(3) respectively adding the metal ceramic material and the heat conduction material, refluxing for 5h at the temperature of 90 ℃, the reflux rate of 30mL/min and the stirring rate of 400r/min, and then carrying out reduced pressure distillation reaction for 1.5h at the temperature of 80 ℃ to obtain the nano metal ceramic solar heat absorption coating material.
Example 5:
a nanoscale metal ceramic solar heat absorption coating material is prepared from the following components in parts by weight: 50 parts of organic silicon resin, 2 parts of curing agent, 12 parts of absorbent, 2 parts of absorption enhancer, 45 parts of auxiliary agent, 13 parts of metal ceramic material and 13 parts of heat conducting material.
Wherein the organic silicon resin is polyester modified organic silicon resin; the curing agent comprises diethylamine and diaminodiphenylmethane; the absorbent is doped modified nano titanium dioxide, the doped modified nano titanium dioxide is nano titanium dioxide doped with silicon dioxide and calcium carbonate, and in the doped modified nano titanium dioxide, the mass percentage of the silicon dioxide is 11 percent, and the mass percentage of the calcium carbonate is 1 percent; the absorption enhancer is 2-bromo-2- (2-fluorophenyl) -1-cyclopropylethanone; the auxiliary agent is n-heptane; the metal ceramic material comprises titanium carbide metal ceramic material and molybdenum silicide metal ceramic material; the heat conductive material includes carbon fibers and heat conductive silicone grease.
A preparation method of a nanoscale metal ceramic solar heat absorption coating material specifically comprises the following steps:
(1) mixing organic silicon resin, an absorbent and an absorption enhancer, and reacting for 5 hours at the temperature of 70 ℃, the pressure of 9MPa and the stirring speed of 1100r/min to obtain a reaction solution;
(2) mixing a curing agent and an auxiliary agent, adding the mixture into the reaction solution, and uniformly stirring;
(3) respectively adding the metal ceramic material and the heat conduction material, refluxing for 3h at the temperature of 105 ℃, the reflux rate of 10mL/min and the stirring rate of 700r/min, and then carrying out reduced pressure distillation reaction for 1h at the temperature of 90 ℃ to obtain the nano metal ceramic solar heat absorption coating material.
Example 6:
a nanoscale metal ceramic solar heat absorption coating material is prepared from the following components in parts by weight: 45 parts of organic silicon resin, 5 parts of curing agent, 11.5 parts of absorbent, 3 parts of absorption enhancer, 38 parts of auxiliary agent, 15 parts of metal ceramic material and 9 parts of heat conduction material.
Wherein the organic silicon resin comprises epoxy modified organic silicon resin and highlight organic silicon resin; the curing agent is m-xylylenediamine; the absorbent is doped modified nano titanium dioxide, the doped modified nano titanium dioxide is doped silicon dioxide and calcium carbonate, and in the doped modified nano titanium dioxide, the mass percentage of the silicon dioxide is 5 percent, and the mass percentage of the calcium carbonate is 3 percent; the absorption enhancer is 2-bromo-2- (2-fluorophenyl) -1-cyclopropylethanone; the auxiliary agent comprises ethyl acetate and n-heptane; the cermet material is tungsten boride cermet material; the heat conducting material is heat conducting silicone grease.
A preparation method of a nanoscale metal ceramic solar heat absorption coating material specifically comprises the following steps:
(1) mixing organic silicon resin, an absorbent and an absorption enhancer, and reacting for 3h at the temperature of 60 ℃, the pressure of 13MPa and the stirring speed of 800r/min to obtain a reaction solution;
(2) mixing a curing agent and an auxiliary agent, adding the mixture into the reaction solution, and uniformly stirring;
(3) respectively adding the metal ceramic material and the heat conduction material, refluxing for 4 hours at the temperature of 98 ℃, the reflux rate of 20mL/min and the stirring rate of 500r/min, and then carrying out reduced pressure distillation reaction for 2 hours at the temperature of 70 ℃ to obtain the nano metal ceramic solar heat absorption coating material.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.

Claims (3)

1. The nanoscale metal ceramic solar heat absorption coating material is characterized by being prepared from the following components in parts by weight: 40-50 parts of organic silicon resin, 2-7 parts of curing agent, 11-12 parts of absorbent, 2-4 parts of absorption enhancer, 33-45 parts of auxiliary agent, 13-17 parts of metal ceramic material and 7-13 parts of heat conduction material, wherein the absorbent is doped modified nano titanium dioxide;
the doped modified nano titanium dioxide is nano titanium dioxide doped with silicon dioxide and calcium carbonate;
in the doped modified nano titanium dioxide, the mass percent of silicon dioxide is 5-11%, and the mass percent of calcium carbonate is 1-3%;
the organic silicon resin comprises one or more of epoxy modified organic silicon resin, polyester modified organic silicon resin or high-gloss organic silicon resin;
the absorption enhancer is 2-bromo-2- (2-fluorophenyl) -1-cyclopropylethanone;
the auxiliary agent comprises one or two of ethyl acetate or n-heptane;
the cermet material comprises one or more of tungsten boride cermet material, titanium carbide cermet material or molybdenum silicide cermet material;
the heat conduction material comprises one or more of graphene, carbon fiber or heat conduction silicone grease.
2. The nanoscale cermet solar heat absorption coating material as claimed in claim 1, wherein the curing agent comprises one or more of m-xylylenediamine, diethylamine or diaminodiphenylmethane.
3. The preparation method of the nanoscale cermet solar heat absorption coating material as set forth in any one of claims 1-2, characterized in that the method comprises the following steps:
(1) mixing organic silicon resin, an absorbent and an absorption enhancer, and reacting for 3-7h at the temperature of 60-80 ℃, the pressure of 7-13MPa and the stirring speed of 800-;
(2) mixing a curing agent and an auxiliary agent, adding the mixture into the reaction solution, and uniformly stirring;
(3) respectively adding a metal ceramic material and a heat conducting material, refluxing for 3-5h at the temperature of 90-105 ℃, the reflux rate of 10-30mL/min and the stirring rate of 400-700r/min, and then carrying out reduced pressure distillation reaction for 1-2h at the temperature of 70-90 ℃ to obtain the nano metal ceramic solar heat absorption coating material.
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