CN111662615A - Preparation method of heat-shielding coating for roads - Google Patents
Preparation method of heat-shielding coating for roads Download PDFInfo
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- 239000011248 coating agent Substances 0.000 title claims abstract description 59
- 238000000576 coating method Methods 0.000 title claims abstract description 59
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 239000000945 filler Substances 0.000 claims abstract description 39
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000000919 ceramic Substances 0.000 claims abstract description 25
- 239000004005 microsphere Substances 0.000 claims abstract description 22
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 21
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000011863 silicon-based powder Substances 0.000 claims abstract description 21
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910001887 tin oxide Inorganic materials 0.000 claims abstract description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000001301 oxygen Substances 0.000 claims abstract description 10
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 10
- 239000013077 target material Substances 0.000 claims abstract description 9
- 239000010426 asphalt Substances 0.000 claims description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 239000000843 powder Substances 0.000 claims description 20
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- 238000001816 cooling Methods 0.000 claims description 18
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- 239000007789 gas Substances 0.000 claims description 18
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- 238000000034 method Methods 0.000 claims description 17
- 229920000647 polyepoxide Polymers 0.000 claims description 17
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 claims description 16
- 238000002156 mixing Methods 0.000 claims description 16
- 239000000758 substrate Substances 0.000 claims description 15
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 14
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- 238000004544 sputter deposition Methods 0.000 claims description 13
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- 238000005303 weighing Methods 0.000 claims description 12
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- 238000003825 pressing Methods 0.000 claims description 10
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- 230000000171 quenching effect Effects 0.000 claims description 10
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- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 abstract description 2
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- QFXZANXYUCUTQH-UHFFFAOYSA-N ethynol Chemical group OC#C QFXZANXYUCUTQH-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING 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
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING 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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/24—Electrically-conducting paints
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING 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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/32—Radiation-absorbing paints
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
- C23C14/22—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the process of coating
- C23C14/34—Sputtering
- C23C14/3435—Applying energy to the substrate during sputtering
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
- E01C11/24—Methods or arrangements for preventing slipperiness or protecting against influences of the weather
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/35—Toppings or surface dressings; Methods of mixing, impregnating, or spreading them
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Road Paving Structures (AREA)
Abstract
The invention relates to a preparation method of a heat-shielding coating for a road, belonging to the technical field of coating materials. The invention takes aluminum powder, zinc oxide powder, silicon powder and carbon powder as raw materials to prepare the hollow ceramic microspheres by a reaction thermal spraying technology, because Al3+The oxygen vacancy is formed by dissolving ZnO in a solid solution so as to generate a free carrier, when a light source irradiates the surface of the transparent heat insulation coating, the carrier can absorb part of heat radiation, and the other part of the heat radiation is reflected by plasma; incident light source at a lower frequency than the plasmaThe natural frequency of the body oscillation is realized, so that the heat radiation blocking effect of the coating is the result of the combined action of absorption and reflection, and the absorption and reflection jointly play a role in shielding infrared light, so that good heat insulation performance is generated; according to the invention, tin is used as a target material, and a layer of tin oxide film is sputtered on the surface of the hollow ceramic microsphere as a heat shielding filler, so that the conductivity of the coating can be increased, the static accumulation on the surface of the coating is inhibited, and a certain effect is achieved on the cleaning of the surface of the coating.
Description
Technical Field
The invention relates to a preparation method of a heat-shielding coating for a road, belonging to the technical field of coating materials.
Background
With the development of civilization and economy of society, cities gradually become areas where human activities are more concentrated and prosperous, so that the scale of city construction and development is continuously enlarged. The development speed and scale of urban industrialization have become important marks of national social civilization, economic development and advanced productivity. The rapid development of the urbanization process brings a series of negative problems while improving the living environment of people. Wherein the/heat island effect 0 is the more prominent one.
The urban/heat island effect refers to the phenomenon that the urban air temperature is obviously higher than that of the suburbs at the periphery. On the near-ground temperature map, the suburban area has low temperature, and the urban area is a high-temperature area, like an island protruding the sea surface, since such an island represents a high-temperature urban area, the studied image is called urban/thermal island effect 0. The heat island effect mostly occurs in big cities, so that the annual average temperature of the cities is higher than that of suburbs by 1 ℃ or even more, and the temperature of local areas of the cities in summer is sometimes higher than that of the suburbs by more than 6 ℃. The temperature difference between the urban areas and the suburban areas in the Shanghai city in winter and summer respectively reaches 6.8 ℃ and 4.8 ℃, the average air temperature in Beijing city in 1 month is-2.4 ℃, the temperature is 2.4 ℃ higher than that in the suburban areas, and the temperature in the central area of los Angeles in summer is 2.8 ℃ higher than that in the suburban areas and the suburban areas around. Since the 80 s in the 20 th century, the urban livability is greatly reduced due to the increasingly serious urban heat island problem, and the urban heat island phenomenon is more and more widely concerned. In recent years, asphalt pavements are widely applied to urban roads, and absorb a large amount of solar radiation, so that the urban heat island effect is more serious. High temperature asphalt pavement also releases a large amount of asphalt volatile matters, which causes the human environment to be rapidly deteriorated. The reason for the formation of urban heat islands and the damage caused by the over-high temperature of asphalt pavement are mainly described below.
At present, the urban roads in China are mainly asphalt pavements. As is known, asphalt belongs to a heat-absorbing material, and has high absorptivity to solar radiation, wherein the absorptivity can reach 0.85-0.93. In summer, under the continuous heat radiation action of the sun, a large amount of heat is absorbed by the asphalt pavement and accumulated in the asphalt surface layer, so that the temperature of the pavement is far higher than the air temperature, particularly in most areas of China, the highest air temperature in summer can reach more than 35-40 ℃, and the highest temperature of the asphalt pavement is higher than the highest air temperature and can reach 60-65 ℃. The effects that can be caused in such an environment are mainly the following two aspects:
1. influence on driving safety
The influence on the driving safety is mainly caused by track diseases. Rutting is caused by excessive temperature of the asphalt pavement. It has been observed that rutting can be limited to a few millimeters at road surface temperatures below 35 c, and that rutting can grow rapidly at temperatures above 38 c. Therefore, in a certain area, even if a plurality of juveniles do not generate large ruts, once the juveniles encounter extreme high temperature which is not met for decades, namely the temperature of the road surface is in the range of 55-65 ℃, serious rut damage is feared to be difficult to avoid.
Influence on atmospheric temperature
The sun releases energy to the outside continuously, and the energy reaching the top of the atmosphere is 1353W/m2The maximum energy reaching sea level is about 1100W/m2Approximately 30% of the energy is absorbed by the atmosphere at 5 km.
The energy absorbed by the near-surface atmosphere only accounts for 30% of the energy absorbed by the whole atmosphere, and accounts for about 0.2% of the incident solar energy. The road surface can absorb up to 95% of solar energy, and the atmospheric temperature is raised through heat radiation and heat exchange. The energy absorbed directly by the near-surface atmosphere is even negligible compared to the energy absorbed by the road surface. If the average solar energy absorbed by the road surface is reduced from 90% to 65%, the very high value of the atmospheric temperature will be reduced by 0.6 ℃. It follows that the road surface temperature has a great influence on the atmospheric temperature.
At present, in order to weaken the urban heat island effect, the concept of ecological design and construction is generally applied to the urban planning and design process. Adopting a layout including changing city buildings and blocks; the traditional construction method and building materials used in the past urban construction are changed, and a novel material with higher reflectivity which can enable most of solar radiation to be reflected is adopted; the emission of harmful gases and heat is reduced; increase the urban green land and greening coverage area. The measures play a role in relieving the urban heat island effect. However, a city is an area with high density of buildings and dense roads, and most of the area of the city is covered by the buildings and roads, and the spatial distribution of the city may be unbalanced. For example, in the central business district of the city, the urban heat island effect is often the most serious area. Under the condition, if the temperature of the road surface occupying a huge area of the city can be reduced, an effective solution can be provided for inhibiting the continuous aggravation of the urban heat island effect. From the above analysis, it can be seen that reducing the road surface temperature is a direct and effective method for reducing the atmospheric temperature, improving the driving safety and relieving the urban heat island effect. Therefore, certain technical measures are required, for example, a solar heat reflection coating technology is adopted, the heat radiation absorption characteristic of the surface of the asphalt road is changed, the energy of solar radiation is reflected to an outer space, the accumulation of heat energy in the asphalt mixture is weakened, and the temperature of the asphalt road surface is reduced.
The solar heat reflecting coating can effectively reduce the temperature of the pavement mainly through the reflection of infrared rays, which has important significance for solving the existing expressway rut diseases and preventing the rut diseases in the future in China; meanwhile, the reduction of the temperature of the road surface reduces the heat storage capacity of the road body, reduces the heat radiation capacity of the road surface to the outside and can improve the thermal environment of the surrounding area. The method also has important significance for inhibiting the urban heat island effect.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the preparation method of the heat-shielding coating for the road is provided aiming at the problem that the asphalt pavement absorbs a large amount of solar radiation in the urban road and causes the urban heat island effect to be more serious.
In order to solve the technical problems, the invention adopts the following technical scheme:
(1) taking aluminum powder, zinc oxide powder, silicon powder, carbon powder, urea and deionized water, mixing the aluminum powder, the zinc oxide powder, the silicon powder, the carbon powder, the urea and the deionized water, carrying out ball milling treatment to obtain mixed slurry, and drying and granulating the mixed slurry in a small drop manner at the temperature of 80-100 ℃ to obtain a semi-finished product;
(2) with N2Performing spray coating and quenching on the semi-finished product as powder feeding gas, and cooling to room temperature to obtain hollow ceramic microspheres;
(3) placing tin oxide in a die with the diameter of 62-65 mm for pressing treatment to obtain a blank, carrying out heat preservation sintering treatment on the blank, and cooling to room temperature to obtain a target material;
(4) sputtering the substrate to form a film by taking the hollow ceramic microspheres as a substrate and taking working gases as oxygen and argon to obtain a coarse filler, annealing the coarse filler, and cooling to room temperature to obtain the filler;
(5) mixing epoxy resin, filler, OP-10, ethylenediamine and defoamer AKN-3330, stirring at a high speed and carrying out ultrasonic treatment to obtain a mixture, adding ethylenediamine and defoamer AKN-3330 into the mixture, and continuously stirring for 3-5 min to obtain a heat-shielding coating; and (3) scraping the heat-shielding coating on the asphalt pavement, and naturally airing to obtain the heat-shielding coating for the road.
The aluminum powder, the zinc oxide powder, the silicon powder, the carbon powder, the urea and the deionized water in the step (1) are in the following proportion: respectively weighing 20-30 parts of aluminum powder, 30-40 parts of zinc oxide powder, 10-20 parts of silicon powder, 5-15 parts of carbon powder, 20-30 parts of urea and 100-120 parts of deionized water according to parts by weight.
The ball milling treatment step in the step (1) is as follows: mixing aluminum powder, zinc oxide powder, silicon powder, carbon powder, urea and deionized water, and ball-milling at the rotating speed of 400-500 r/min for 30-40 min.
The steps of the meltallizing and quenching in the step (2) are as follows: with N2And performing melt jetting and quenching on the semi-finished product as powder feeding gas, wherein the receiving medium is common tap water, the preheating temperature is 210-220 ℃, the gas-powder mass flow rate ratio is 9, and the jetting distance is 220-230 mm.
The pressing treatment step in the step (2) is as follows: and (3) placing the tin oxide in a die with the diameter of 62-65 mm, and pressing for 1-3 min under the pressure of 10-15 MPa.
The heat-preservation sintering treatment step in the step (3) is as follows: and (3) placing the blank at the temperature of 1200-1250 ℃ for heat preservation and sintering for 1-2 h.
The sputtering film forming step in the step (4) is as follows: the hollow ceramic microspheres are used as a matrix, working gas is oxygen and argon, the matrix is sputtered to form a film, the distance between a target and the matrix is 8-9 cm, and sputtering is carried out for 6-8 hours at normal temperature.
The annealing treatment step in the step (4) is as follows: annealing the coarse filler at 500-550 ℃ for 1-2 h.
The epoxy resin, the filler, the OP-10, the ethylenediamine and the defoaming agent AKN-3330 in the step (5) are in the following proportion: respectively weighing 30-50 parts of epoxy resin, 10-20 parts of filler, 1-8 parts of OP-10, 1-3 parts of ethylenediamine and 1-5 parts of defoaming agent AKN-3330 in parts by weight.
The high-speed stirring and ultrasonic processing step in the step (5) comprises the following steps: mixing epoxy resin, a filler and OP-10, stirring at a high speed of 1800-2000 r/min for 20-30 min, and ultrasonically dispersing for 10-15 min.
Compared with other methods, the method has the beneficial technical effects that:
(1) the invention takes aluminum powder, zinc oxide powder, silicon powder and carbon powder as raw materials, a hollow ceramic microsphere is prepared by a reaction thermal spraying technology, tin oxide is taken as a target material, a layer of tin oxide film is sputtered on the surface of the hollow ceramic microsphere as a heat shielding filler, epoxy resin is taken as a raw material, a heat shielding coating is prepared, and the coating is blade-coated on an asphalt pavement, thus obtaining a heat shielding coating for roads; the hollow ceramic microspheres have a series of advantages of fine particles, hollowness, light weight, high temperature resistance, corrosion resistance, radiation protection, stable chemical performance and the like, and the agglomerated composite particles entering an oxy-acetylene flame flow field are subjected to the action of environmental radiation and heat conduction and are a process of heating from the surface to the inside; along with the increase of the flying distance and the extension of the heating time, the surface temperature of the agglomerated powder particles is rapidly increased, fine Al powder particles on the outer surface of the agglomerated powder are firstly heated and melted, and on one hand, the molten Al solution permeates into the pores of the agglomerated powder through diffusion and capillary action to soak ZnO, Si and C particles; on the other hand, under the action of surface tension, the powder is spread and connected into a piece until the whole agglomerated powder is wrapped, when the self-propagating ignition temperature of Al and ZnO is reached, the self-propagating reaction is rapidly carried out, a large amount of heat is released, and further the self-propagating reaction of Si and C with low heat release is initiated, and SiC is generated; the hollow structure is formed by CO and CO coexisting with the ceramic molten drop generated in the process of melting and shooting2The gas cannot escape in time, and is retained in the ceramic droplets to form a hollow structure when the ceramic droplets are rapidly solidified into solid ceramic microspheres；
(2) The invention takes aluminum powder, zinc oxide powder, silicon powder and carbon powder as raw materials to prepare the hollow ceramic microspheres by a reaction thermal spraying technology, because Al3+The oxygen vacancy is formed by dissolving ZnO in a solid solution so as to generate a free carrier, when a light source irradiates the surface of the transparent heat insulation coating, the carrier can absorb part of heat radiation, and the other part of the heat radiation is reflected by plasma; the frequency of an incident light source is lower than the natural frequency of plasma oscillation, so that the barrier effect of the coating on thermal radiation is the result of the combined action of absorption and reflection, and the absorption and reflection play a role in shielding infrared light together, so that the infrared light is well insulated;
(3) according to the invention, tin is used as a target material, and a layer of tin oxide film is sputtered on the surface of the hollow ceramic microsphere as a heat shielding filler, so that the conductivity of the coating can be increased, and the electrostatic accumulation on the surface of the coating can be inhibited, thereby inhibiting the dust adsorption on the surface of the coating caused by electrostatic attraction and having a certain effect on cleaning the surface of the coating; its function as a heat-insulating film is largely achieved by absorption of infrared light, with reflection taking up only a small proportion.
Detailed Description
Respectively weighing 20-30 parts of aluminum powder, 30-40 parts of zinc oxide powder, 10-20 parts of silicon powder, 5-15 parts of carbon powder, 20-30 parts of urea and 100-120 parts of deionized water according to parts by weight, mixing the aluminum powder, the zinc oxide powder, the silicon powder, the carbon powder, the urea and the deionized water, ball-milling for 30-40 min at the rotating speed of 400-500 r/min to obtain mixed slurry, drying and granulating the mixed slurry in the form of small droplets at the temperature of 80-100 ℃ to obtain a semi-finished product; with N2Performing melt jetting and quenching on the semi-finished product as powder feeding gas, wherein a receiving medium is common tap water, the preheating temperature is 210-220 ℃, the gas-powder mass flow rate ratio is 9, the jetting distance is 220-230 mm, and cooling to room temperature to obtain the hollow ceramic microspheres; placing tin oxide in a die with the diameter of 62-65 mm, pressing for 1-3 min under the pressure of 10-15 MPa to obtain a blank, placing the blank at the temperature of 1200-1250 ℃, carrying out heat preservation sintering for 1-2 h, and cooling to room temperature to obtain a target material; hollow ceramic microspheres are used as a matrix, and working gas is oxygen and argonSputtering a substrate to form a film, wherein the distance between a target and the substrate is 8-9 cm, sputtering for 6-8 h at normal temperature to obtain a coarse filler, annealing the coarse filler at 500-550 ℃ for 1-2 h, and cooling to room temperature to obtain the filler; respectively weighing 30-50 parts of epoxy resin, 10-20 parts of filler, 1-8 parts of OP-10, 1-3 parts of ethylenediamine and 1-5 parts of defoaming agent AKN-3330 by weight, mixing the epoxy resin, the filler and the OP-10, stirring at a high speed of 1800-2000 r/min for 20-30 min, ultrasonically dispersing for 10-15 min to obtain a mixture, adding the ethylenediamine and the defoaming agent AKN-3330 into the mixture, and continuously stirring for 3-5 min to obtain the heat-shielding coating; and (3) scraping the heat-shielding coating on the asphalt pavement, and naturally airing to obtain the heat-shielding coating for the road.
Example 1
Respectively weighing 20 parts of aluminum powder, 30 parts of zinc oxide powder, 10 parts of silicon powder, 5 parts of carbon powder, 20 parts of urea and 100 parts of deionized water, mixing the aluminum powder, the zinc oxide powder, the silicon powder, the carbon powder, the urea and the deionized water, carrying out ball milling for 30min at the rotating speed of 400r/min to obtain mixed slurry, and drying and granulating the mixed slurry in the form of small droplets at the temperature of 80 ℃ to obtain a semi-finished product; with N2Performing melt jetting and quenching on the semi-finished product as powder feeding gas, wherein a receiving medium is common tap water, the preheating temperature is 210 ℃, the gas-powder mass flow rate ratio is 9, the jetting distance is 220mm, and cooling to room temperature to obtain the hollow ceramic microspheres; placing tin oxide in a die with the diameter of 62mm, pressing for 1min under the pressure of 10MPa to obtain a blank, placing the blank at the temperature of 1200 ℃, preserving heat, sintering for 1h, and cooling to room temperature to obtain a target material; sputtering the substrate to form a film by taking the hollow ceramic microspheres as a substrate and taking working gases as oxygen and argon, wherein the distance between a target and the substrate is 8cm, sputtering for 6 hours at normal temperature to obtain a coarse filler, annealing the coarse filler for 1 hour at the temperature of 500 ℃, and cooling to room temperature to obtain the filler; respectively weighing 30 parts of epoxy resin, 10 parts of filler, 1 part of OP-10, 1 part of ethylenediamine and 1 part of defoaming agent AKN-3330 in parts by weight, mixing the epoxy resin, the filler and the OP-10, stirring at a high speed of 1800r/min for 20min, ultrasonically dispersing for 10min to obtain a mixture, adding the ethylenediamine and the defoaming agent AKN-333 into the mixture0, continuously stirring for 3min to obtain a heat-shielding coating; and (3) scraping the heat-shielding coating on the asphalt pavement, and naturally airing to obtain the heat-shielding coating for the road.
Example 2
Respectively weighing 25 parts of aluminum powder, 35 parts of zinc oxide powder, 15 parts of silicon powder, 10 parts of carbon powder, 25 parts of urea and 110 parts of deionized water, mixing the aluminum powder, the zinc oxide powder, the silicon powder, the carbon powder, the urea and the deionized water, carrying out ball milling for 35min at the rotating speed of 450r/min to obtain mixed slurry, and drying and granulating the mixed slurry in the form of small droplets at the temperature of 90 ℃ to obtain a semi-finished product; with N2Performing melt jetting and quenching on the semi-finished product as powder feeding gas, wherein a receiving medium is common tap water, the preheating temperature is 215 ℃, the gas-powder mass flow rate ratio is 9, the jetting distance is 225mm, and cooling to room temperature to obtain the hollow ceramic microspheres; placing tin oxide in a mold with the diameter of 63mm, pressing for 2min under the pressure of 13MPa to obtain a blank, placing the blank at the temperature of 1225 ℃, preserving heat, sintering for 1.5h, and cooling to room temperature to obtain a target material; sputtering the substrate to form a film by taking the hollow ceramic microspheres as a substrate and taking working gas as oxygen and argon, wherein the distance between a target and the substrate is 8.5cm, sputtering for 7 hours at normal temperature to obtain a coarse filler, annealing the coarse filler at 525 ℃ for 1.5 hours, and cooling to room temperature to obtain the filler; respectively weighing 40 parts of epoxy resin, 15 parts of filler, 5 parts of OP-10, 2 parts of ethylenediamine and 3 parts of defoaming agent AKN-3330 in parts by weight, mixing the epoxy resin, the filler and the OP-10, stirring at a high speed of 1900r/min for 25min, ultrasonically dispersing for 13min to obtain a mixture, adding the ethylenediamine and the defoaming agent AKN-3330 into the mixture, and continuously stirring for 4min to obtain the heat-shielding coating; and (3) scraping the heat-shielding coating on the asphalt pavement, and naturally airing to obtain the heat-shielding coating for the road.
Example 3
Respectively weighing 30 parts of aluminum powder, 40 parts of zinc oxide powder, 20 parts of silicon powder, 15 parts of carbon powder, 30 parts of urea and 120 parts of deionized water according to parts by weight, mixing the aluminum powder, the zinc oxide powder, the silicon powder, the carbon powder, the urea and the deionized water, carrying out ball milling for 40min at the rotating speed of 500r/min to obtain mixed slurry, and drying the mixed slurry in the form of small drops at the temperature of 100 DEG CDrying and granulating to obtain a semi-finished product; with N2Performing melt jetting and quenching on the semi-finished product as powder feeding gas, wherein a receiving medium is common tap water, the preheating temperature is 220 ℃, the gas-powder mass flow rate ratio is 9, the jetting distance is 230mm, and cooling to room temperature to obtain the hollow ceramic microspheres; placing tin oxide in a mold with diameter of 65mm, pressing under 15MPa for 3min to obtain a blank, sintering the blank at 1250 deg.C for 2h, and cooling to room temperature to obtain target material; sputtering the substrate to form a film by taking the hollow ceramic microspheres as a substrate and taking working gas as oxygen and argon, wherein the distance between a target and the substrate is 9cm, sputtering for 8 hours at normal temperature to obtain a coarse filler, annealing the coarse filler at 550 ℃ for 2 hours, and cooling to room temperature to obtain the filler; respectively weighing 50 parts of epoxy resin, 20 parts of filler, 8 parts of OP-10, 3 parts of ethylenediamine and 5 parts of defoaming agent AKN-3330 in parts by weight, mixing the epoxy resin, the filler and the OP-10, stirring at a high speed of 2000r/min for 30min, ultrasonically dispersing for 15min to obtain a mixture, adding the ethylenediamine and the defoaming agent AKN-3330 into the mixture, and continuously stirring for 5min to obtain the heat-shielding coating; and (3) scraping the heat-shielding coating on the asphalt pavement, and naturally airing to obtain the heat-shielding coating for the road.
The performance of the road heat-shielding coating prepared by the invention is detected, and the specific detection results are shown in the following table 1.
The test method comprises the following steps:
water resistance:
1. 3 aggregates are selected and covered by the asphalt film. The specific method is to use the preparation of asphalt samples in the adhesion test of asphalt and coarse aggregate for reference;
2. after the test piece coated with the asphalt film is completely dried, immersing the test piece into the solar heat reflection coating to completely wrap the coating outside the test piece at normal temperature;
3. and putting the test piece with the dried surface wrapped with the coating into a constant-temperature water tank, adjusting the water temperature to (25 days 1e), soaking for 24 hours, taking out after the time is up, sucking the surface moisture, and observing the change of the coating.
The coating adhesion was tested with reference to astm d 3359.
Heat insulation performance: and adopting a portable thermal infrared imager to acquire data of the surface and the side surface of the test piece.
TABLE 1 Heat Barrier coating Performance characterization for roads
| Detecting items | Example 1 | Example 2 | Example 3 |
| Water resistance | The test piece has complete surface and no bubbling, discoloring and falling-off phenomena | The test piece has complete surface and no bubbling, discoloring and falling-off phenomena | The test piece has complete surface and no bubbling, discoloring and falling-off phenomena |
| Grade of adhesion | 5A | 5A | 5A |
| Thermal insulation temperature difference | 31.5 | 31.9 | 32.6 |
As can be seen from Table 1, the road heat-shielding coating prepared by the invention has the advantages of good water resistance, high adhesive force level, large heat insulation temperature difference and remarkable heat-shielding effect.
Claims (10)
1. A preparation method of a heat-shielding coating for roads is characterized by comprising the following specific preparation steps:
(1) taking aluminum powder, zinc oxide powder, silicon powder, carbon powder, urea and deionized water, mixing the aluminum powder, the zinc oxide powder, the silicon powder, the carbon powder, the urea and the deionized water, carrying out ball milling treatment to obtain mixed slurry, and drying and granulating the mixed slurry in a small drop manner at the temperature of 80-100 ℃ to obtain a semi-finished product;
(2) with N2Performing spray coating and quenching on the semi-finished product as powder feeding gas, and cooling to room temperature to obtain hollow ceramic microspheres;
(3) placing tin oxide in a die with the diameter of 62-65 mm for pressing treatment to obtain a blank, carrying out heat preservation sintering treatment on the blank, and cooling to room temperature to obtain a target material;
(4) sputtering the substrate to form a film by taking the hollow ceramic microspheres as a substrate and taking working gases as oxygen and argon to obtain a coarse filler, annealing the coarse filler, and cooling to room temperature to obtain the filler;
(5) mixing epoxy resin, filler, OP-10, ethylenediamine and defoamer AKN-3330, stirring at a high speed and carrying out ultrasonic treatment to obtain a mixture, adding ethylenediamine and defoamer AKN-3330 into the mixture, and continuously stirring for 3-5 min to obtain a heat-shielding coating; and (3) scraping the heat-shielding coating on the asphalt pavement, and naturally airing to obtain the heat-shielding coating for the road.
2. The method for preparing a heat-shielding coating for roads according to claim 1, wherein: the aluminum powder, the zinc oxide powder, the silicon powder, the carbon powder, the urea and the deionized water in the step (1) are in the following proportion: respectively weighing 20-30 parts of aluminum powder, 30-40 parts of zinc oxide powder, 10-20 parts of silicon powder, 5-15 parts of carbon powder, 20-30 parts of urea and 100-120 parts of deionized water according to parts by weight.
3. The method for preparing a heat-shielding coating for roads according to claim 1, wherein: the ball milling treatment step in the step (1) is as follows: mixing aluminum powder, zinc oxide powder, silicon powder, carbon powder, urea and deionized water, and ball-milling at the rotating speed of 400-500 r/min for 30-40 min.
4. The method for preparing a heat-shielding coating for roads according to claim 1, wherein: the steps of the meltallizing and quenching in the step (2) are as follows: with N2And performing melt jetting and quenching on the semi-finished product as powder feeding gas, wherein the receiving medium is common tap water, the preheating temperature is 210-220 ℃, the gas-powder mass flow rate ratio is 9, and the jetting distance is 220-230 mm.
5. The method for preparing a heat-shielding coating for roads according to claim 1, wherein: the pressing treatment step in the step (2) is as follows: and (3) placing the tin oxide in a die with the diameter of 62-65 mm, and pressing for 1-3 min under the pressure of 10-15 MPa.
6. The method for preparing a heat-shielding coating for roads according to claim 1, wherein: the heat-preservation sintering treatment step in the step (3) is as follows: and (3) placing the blank at the temperature of 1200-1250 ℃ for heat preservation and sintering for 1-2 h.
7. The method for preparing a heat-shielding coating for roads according to claim 1, wherein: the sputtering film forming step in the step (4) is as follows: the hollow ceramic microspheres are used as a matrix, working gas is oxygen and argon, the matrix is sputtered to form a film, the distance between a target and the matrix is 8-9 cm, and sputtering is carried out for 6-8 hours at normal temperature.
8. The method for preparing a heat-shielding coating for roads according to claim 1, wherein: the annealing treatment step in the step (4) is as follows: annealing the coarse filler at 500-550 ℃ for 1-2 h.
9. The method for preparing a heat-shielding coating for roads according to claim 1, wherein: the epoxy resin, the filler, the OP-10, the ethylenediamine and the defoaming agent AKN-3330 in the step (5) are in the following proportion: respectively weighing 30-50 parts of epoxy resin, 10-20 parts of filler, 1-8 parts of OP-10, 1-3 parts of ethylenediamine and 1-5 parts of defoaming agent AKN-3330 in parts by weight.
10. The method for preparing a heat-shielding coating for roads according to claim 1, wherein: the high-speed stirring and ultrasonic processing step in the step (5) comprises the following steps: mixing epoxy resin, a filler and OP-10, stirring at a high speed of 1800-2000 r/min for 20-30 min, and ultrasonically dispersing for 10-15 min.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118703083A (en) * | 2024-07-16 | 2024-09-27 | 广州佰时居建材有限公司 | A metal roof reflective heat-insulating coating formula and preparation method |
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