CN115895383B - Asphalt pavement heat reflection coating and preparation method thereof - Google Patents
Asphalt pavement heat reflection coating and preparation method thereof Download PDFInfo
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- CN115895383B CN115895383B CN202210816717.8A CN202210816717A CN115895383B CN 115895383 B CN115895383 B CN 115895383B CN 202210816717 A CN202210816717 A CN 202210816717A CN 115895383 B CN115895383 B CN 115895383B
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- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 claims abstract description 22
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 21
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- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims abstract description 18
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Classifications
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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- Road Paving Structures (AREA)
Abstract
The application discloses a thermal reflection coating for an asphalt pavement and a preparation method thereof, wherein the thermal reflection coating is prepared from the following raw materials in parts by weight: 97.0 parts of epoxy resin, 3.0 parts of liquid phenolic resin, 15.1-17.7 parts of rutile type titanium dioxide, 2.5-3.9 parts of magnesium silicate powder, 4.5-7.5 parts of hollow glass beads, 4.0-6.1 parts of sericite powder, 2.2-4.0 parts of iron oxide brown powder, 0.3-1.0 parts of fumed silica, 6.5-9.5 parts of diluent, 2.4-3.1 parts of propylene glycol, 20.0-50.0 parts of epoxy resin curing agent, 0.52-0.70 parts of coupling agent and 7.9-10.2 parts of silicon carbide. The application of the asphalt pavement heat reflection coating is a composite material with little influence on environment, has excellent road performance, can inhibit the diseases such as ruts, hugs and the like generated by the reduction of high-temperature stability caused by the temperature rise of the asphalt pavement in high-temperature weather, and has great significance in prolonging the service life of the asphalt pavement; the application has the advantages of wide raw material sources, low price, simple preparation process and good social and economic benefits.
Description
Technical Field
The application relates to the technical field of road engineering materials, in particular to a thermal reflection coating for an asphalt pavement and a preparation method thereof.
Background
The asphalt pavement is a pavement structure with a pavement layer of asphalt mixture paved on a flexible base layer and a semi-rigid base layer, and compared with a sand pavement, the asphalt pavement has the advantages that the strength stability is greatly improved, the construction time is short, and the dust is less; compared with cement concrete pavement, the asphalt pavement has the advantages of flat and seamless surface, small driving vibration, low noise, quick traffic opening, simple and quick repair and maintenance, and suitability for pavement staged construction. The asphalt pavement also has the characteristic of easy heat absorption, and particularly the pavement surface temperature can be far higher than the ambient temperature in high-temperature weather, even can exceed 60 ℃ sometimes, and the road surface temperature exceeds the ambient temperature by five times. However, asphalt is used as a viscoelastic body, road performance, mechanical property and the like of the asphalt are greatly related to temperature change, high temperature can cause the decrease of adhesive force between an adhesive of an asphalt pavement and mineral aggregate of asphalt mixture, the increase of fluidity, the enhancement of creep property and the decrease of dynamic stability, in-situ shear stress and shear flow can be generated under the action of heavy and repeated load so as to lead the pavement to deform, and in addition, the deformation of road traffic channeling is accumulated so as to generate diseases such as rutting, advocate, and the like, so that the flatness of the pavement is greatly weakened, and meanwhile, the diseases can lead the structural strength of the pavement, the anti-skid capability under rainy and snowy weather and the vehicle operability during overtaking lane change to be damaged to a certain extent, so that great threat is generated to driving safety, and huge economic and potential safety hazards exist.
The existing asphalt pavement technology for high temperature mainly adopts means such as building a water-retaining pavement, but long-term water absorption and evaporation can cause the change of the internal structure of the asphalt pavement to influence the pavement performance due to the need of pouring water-retaining materials, so that the asphalt pavement has no comprehensiveness. Therefore, it is particularly critical to develop a thermal reflective coating material for asphalt pavement to solve the high-temperature disease of asphalt pavement.
The information disclosed in this background section is only for enhancement of understanding of the background of the disclosure and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is well known to a person skilled in the art.
Disclosure of Invention
The application provides a thermal reflection coating for an asphalt pavement and a preparation method thereof, and aims to reduce the height Wen Binghai of the asphalt pavement while ensuring the pavement performance after the coating is paved.
In order to solve the technical problems, the application adopts the following technical scheme:
according to one aspect of the present disclosure, there is provided a thermal reflective coating for asphalt pavement, which is prepared from the following raw materials in parts by weight: 97.0 parts of epoxy resin, 3.0 parts of liquid phenolic resin, 15.1-17.7 parts of rutile type titanium dioxide, 2.5-3.9 parts of magnesium silicate powder, 4.5-7.5 parts of hollow glass beads, 4.0-6.1 parts of sericite powder, 2.2-4.0 parts of iron oxide brown powder, 0.3-1.0 parts of fumed silica, 6.5-9.5 parts of diluent, 2.4-3.1 parts of propylene glycol, 20.0-50.0 parts of epoxy resin curing agent, 0.52-0.70 parts of coupling agent and 7.9-10.2 parts of silicon carbide.
In some embodiments of the present disclosure, the asphalt pavement heat reflective coating is made from the following raw materials in parts by weight: 97.0 parts of epoxy resin, 3.0 parts of liquid phenolic resin, 15.5-17.0 parts of rutile type titanium dioxide, 2.7-3.7 parts of magnesium silicate powder, 5.0-7.0 parts of hollow glass beads, 4.5-5.5 parts of sericite powder, 2.5-3.5 parts of iron oxide brown powder, 0.4-0.8 part of fumed silica, 7.0-9.0 parts of diluent, 2.5-3.0 parts of propylene glycol, 25.0-30.0 parts of epoxy resin curing agent, 0.55-0.66 parts of coupling agent and 8.3-9.0 parts of silicon carbide.
In some embodiments of the present disclosure, the asphalt pavement heat reflective coating is made from the following raw materials in parts by weight: 97.0 parts of epoxy resin, 3.0 parts of liquid phenolic resin, 15.8 parts of rutile type titanium dioxide, 2.9 parts of magnesium silicate powder, 5.2 parts of hollow glass beads, 4.6 parts of sericite powder, 2.7 parts of iron oxide brown powder, 0.5 part of fumed silica, 7.2 parts of diluent, 2.6 parts of propylene glycol, 26.6 parts of epoxy resin curing agent, 0.57 parts of coupling agent and 8.4 parts of silicon carbide.
In some embodiments of the present disclosure, the fumed silica is a commercially available common material.
In some embodiments of the present disclosure, the diluent is 692 epoxy reactive diluent.
In some embodiments of the present disclosure, the epoxy resin curing agent is a 593 curing agent.
In some embodiments of the present disclosure, the coupling agent is a silane coupling agent KH-550.
According to another aspect of the present disclosure, there is provided a method for preparing a thermal reflective coating for an asphalt pavement, comprising:
(1) Surface modification treatment of functional filler: selecting the raw materials according to the parts by weight;
uniformly mixing rutile titanium dioxide, a coupling agent, absolute ethyl alcohol and water according to the mass ratio of 1:0.01-0.3:4-6:0.4-0.6 to obtain modified rutile titanium dioxide; uniformly mixing magnesium silicate powder, a coupling agent, absolute ethyl alcohol and water according to the mass ratio of 1:0.01-0.3:4-6:0.4-0.6 to obtain modified magnesium silicate powder; uniformly mixing the hollow glass beads, a coupling agent, absolute ethyl alcohol and water in a mass ratio of 1:0.01-0.3:4-6:0.4-0.6 to obtain modified hollow glass beads; uniformly mixing sericite powder, a coupling agent, absolute ethyl alcohol and water according to the mass ratio of 1:0.01-0.3:4-6:0.4-0.6 to obtain modified sericite powder.
Preparing a thermal reflection coating material for asphalt pavement: sequentially adding an active diluent and propylene glycol into the epoxy resin, uniformly stirring, transferring the epoxy resin to a magnetic stirrer, and adding liquid phenolic resin into the magnetic stirrer; stirring for 5 minutes by using a magnetic stirrer at room temperature and a rotating speed of 150 r/min; then adjusting the temperature to 30 ℃ and the rotating speed to 300r/min, sequentially adding a proper amount of modified rutile type titanium dioxide, modified magnesium silicate powder, modified sericite powder and fumed silica, and stirring for 5-10min before adding new substances each time to avoid the phenomena of solution caking, agglomeration and the like caused by excessive addition for one time; the rotating speed is reduced to 100r/min, then modified hollow glass beads are added into the mixture and stirred for 10min, and iron oxide brown and silicon carbide are respectively added into the mixture and stirred for 5min; and (3) after the base material is fully mixed with pigment, filler, auxiliary agent and the like, finally adding a curing agent into the mixture and stirring the mixture for 5min, thus obtaining the asphalt pavement heat reflection coating material.
In some embodiments of the present disclosure, in the surface modification treatment of the functional filler in the step (1), a coupling agent is first added into an ethanol solution and stirred uniformly; placing the solution in a three-neck flask, stirring with an electric stirrer at 35 ℃ at a rotating speed of 300r/min, and taking care to avoid material loss caused by contact of the solution with the wall of the flask; after stirring for 5-10min, fully dissolving the coupling agent, and then adding the dried functional filler; mixing the fillers, stirring for 5min, heating to 50deg.C, adjusting rotation speed to 500r/min, and stirring for 60min; after stirring, pouring the solution in the three-neck flask into a beaker, standing at room temperature for 100min for layering, and filtering, drying and grinding to obtain modified functional filler particles.
One or more technical solutions provided in the embodiments of the present application at least have the following technical effects or advantages:
1. the epoxy resin has active groups on the resin chain capable of combining with active groups on other coating materials through copolymerization reaction; the low-viscosity liquid phenolic resin can reduce the viscosity of the epoxy resin, participate in the reaction in the curing process of the epoxy compound and be fused into the coating, so that the toughness of the coating is improved, and the VOCs emission of the coating can be reduced.
2. The hollow glass microsphere has low density, low heat conductivity and high reflection, has good heat and sound insulation capability, has low influence on the viscosity of the paint due to small-dose addition, reduces the use amount of solvent, reduces the emission of VOCs, enhances the elasticity of the coating, and reduces the possible occurrence of cracks and falling phenomena; the rutile type titanium dioxide has strong astigmatism, ultraviolet resistance and refraction capability, and has high density, small photochemical activity, high refractive index and high reflection ratio to near infrared radiation; the magnesium silicate powder has excellent heat insulation, high temperature resistance and fire resistance, has higher reflection and blocking capacities to light and heat, has stronger weather resistance, and can improve the stability of the coating; the sericite powder is in a lamellar structure, the diameter-thickness ratio is large, a labyrinth effect of heat transfer can be formed, the ultraviolet ray shielding capability, water permeation resistance, surface hardness and corrosion resistance of the coating are improved, and the polarization effect of mineral crystals and interlayer water molecules enable the capability of shielding ultraviolet rays, microwaves and infrared rays to be higher than that of other inorganic fillers, and meanwhile, the ageing resistance and the high temperature resistance of the coating are also improved. Based on the addition of the functional filler, the prepared coating improves the reflectivity of the road surface after being paved, namely reduces the radiant energy absorbed by the coating so as to reduce the temperature of the road surface.
3.692 environmental protection reactive diluent can be compatible with solvent-free epoxy resin after being added into the solvent-free epoxy resin, the construction workability is improved while the performances of the coating solution are not affected, and meanwhile, the bubbles generated in the stirring process are better discharged so as to replace the function of an antifoaming agent, so that the amount of organic solvent added into the coating solution is reduced; the fumed silica is added into the coating, so that the toughness, ductility and strength of the coating are enhanced, oil stains are effectively degraded, the damage of corrosive substances to the surface of the coating is reduced, the surface of the coating is smooth and clean, the wear resistance is improved, and the coating has the capabilities of inhibiting the ageing process of the coating and improving the suspension property and the dispersibility of pigment and filler particles; the addition of the propylene glycol can improve the film forming performance of the coating, can reduce the freezing point of the coating, so that the coating is not easy to freeze in extremely cold weather in winter, and can promote the fluidity of the coating to promote the coating to form a smooth and uniform film in the curing process.
4. The amino group contained in the silane coupling agent can give active points for reaction, a molecular bridge can be erected between the matrix and the inorganic filler to enable the two substances to be tightly combined, and the added silane coupling agent KH-550 enables functional filler particles and matrix resin to have more affinity so as to reduce the surface energy of the particles, so that the filler can be stably and uniformly dispersed in the heat reflection type asphalt pavement coating, the cooling effect of the coating is fully exerted, and the mechanical property, heat resistance, weather resistance and water resistance of the coating can be improved.
5. The coating material is environment-friendly, nontoxic and noncorrosive, can inhibit diseases such as ruts, hugs and the like generated by the decrease of high-temperature stability caused by the increase of temperature of the asphalt pavement in high-temperature weather, and has great significance for prolonging the service life of the asphalt pavement; the raw materials have wide sources, the preparation process is simple, the cost is low, and the method has good social and economic benefits.
Detailed Description
The following examples are given to illustrate the application in detail, but are not intended to limit the scope of the application in any way. The instruments and devices referred to in the following examples are conventional instruments and devices unless otherwise specified; the industrial materials are commercially available conventional industrial materials unless otherwise specified.
Embodiment one: the asphalt pavement heat reflection coating is prepared from the following raw materials in parts by weight: 97.0 parts of epoxy resin, 3.0 parts of liquid phenolic resin, 15.1 parts of rutile type titanium dioxide, 2.5 parts of magnesium silicate powder, 4.5 parts of hollow glass beads, 4.0 parts of sericite powder, 2.2 parts of iron oxide brown powder, 0.3 part of fumed silica, 6.5 parts of diluent, 2.4 parts of propylene glycol, 20.0 parts of epoxy resin curing agent, 0.52 parts of coupling agent and 7.9 parts of silicon carbide; the preferred diluent used in this example is 692 epoxy reactive diluent, the epoxy resin curing agent used is 593 curing agent, and the coupling agent used is silane coupling agent KH-550.
Embodiment two: the asphalt pavement heat reflection coating is prepared from the following raw materials in parts by weight: 97.0 parts of epoxy resin, 3.0 parts of liquid phenolic resin, 15.5 parts of rutile type titanium dioxide, 2.7 parts of magnesium silicate powder, 5.0 parts of hollow glass beads, 4.3 parts of sericite powder, 2.5 parts of iron oxide brown powder, 0.4 part of fumed silica, 7.0 parts of diluent, 2.5 parts of propylene glycol, 25 parts of epoxy resin curing agent, 0.56 parts of coupling agent and 8.3 parts of silicon carbide; the preferred diluent used in this example is 692 epoxy reactive diluent, the epoxy resin curing agent used is 593 curing agent, and the coupling agent used is silane coupling agent KH-550.
Embodiment III: the asphalt pavement heat reflection coating is prepared from the following raw materials in parts by weight: 97.0 parts of epoxy resin, 3.0 parts of liquid phenolic resin, 16.2 parts of rutile type titanium dioxide, 3.1 parts of magnesium silicate powder, 5.5 parts of hollow glass beads, 4.9 parts of sericite powder, 2.8 parts of iron oxide brown powder, 0.6 part of fumed silica, 7.5 parts of diluent, 2.7 parts of propylene glycol, 30.0 parts of epoxy resin curing agent, 0.60 parts of coupling agent and 8.7 parts of silicon carbide; the preferred diluent used in this example is 692 epoxy reactive diluent, the epoxy resin curing agent used is 593 curing agent, and the coupling agent used is silane coupling agent KH-550.
Embodiment four: the asphalt pavement heat reflection coating is prepared from the following raw materials in parts by weight: 97.0 parts of epoxy resin, 3.0 parts of liquid phenolic resin, 16.5 parts of rutile type titanium dioxide, 3.3 parts of magnesium silicate powder, 6.0 parts of hollow glass beads, 5.2 parts of sericite powder, 3.1 parts of iron oxide brown powder, 0.7 part of fumed silica, 8.0 parts of diluent, 2.8 parts of propylene glycol, 35.0 parts of epoxy resin curing agent, 0.63 part of coupling agent and 9.1 parts of silicon carbide; the preferred diluent used in this example is 692 epoxy reactive diluent, the epoxy resin curing agent used is 593 curing agent, and the coupling agent used is silane coupling agent KH-550.
Fifth embodiment: the asphalt pavement heat reflection coating is prepared from the following raw materials in parts by weight: 97.0 parts of epoxy resin, 3.0 parts of liquid phenolic resin, 16.9 parts of rutile type titanium dioxide, 3.5 parts of magnesium silicate powder, 6.5 parts of hollow glass beads, 5.5 parts of sericite powder, 3.4 parts of iron oxide brown powder, 0.8 part of fumed silica, 8.5 parts of diluent, 2.9 parts of propylene glycol, 40.0 parts of epoxy resin curing agent, 0.69 parts of coupling agent and 9.5 parts of silicon carbide; the preferred diluent used in this example is 692 epoxy reactive diluent, the epoxy resin curing agent used is 593 curing agent, and the coupling agent used is silane coupling agent KH-550.
Example six: the asphalt pavement heat reflection coating is prepared from the following raw materials in parts by weight: 97.0 parts of epoxy resin, 3.0 parts of liquid phenolic resin, 15.8 parts of rutile type titanium dioxide, 2.9 parts of magnesium silicate powder, 5.2 parts of hollow glass beads, 4.6 parts of sericite powder, 2.7 parts of iron oxide brown powder, 0.5 part of fumed silica, 7.2 parts of diluent, 2.6 parts of propylene glycol, 26.6 parts of epoxy resin curing agent, 0.57 parts of coupling agent and 8.4 parts of silicon carbide; the preferred diluent used in this example is 692 epoxy reactive diluent, the epoxy resin curing agent used is 593 curing agent, and the coupling agent used is silane coupling agent KH-550.
Embodiment seven: the asphalt pavement heat reflection coating is prepared from the following raw materials in parts by weight: 97.0 parts of epoxy resin, 3.0 parts of liquid phenolic resin, 17.7 parts of rutile type titanium dioxide, 3.9 parts of magnesium silicate powder, 7.5 parts of hollow glass beads, 6.1 parts of sericite powder, 4.0 parts of iron oxide brown powder, 1.0 part of fumed silica, 9.5 parts of diluent, 3.1 parts of propylene glycol, 50.0 parts of epoxy resin curing agent, 0.70 parts of coupling agent and 10.2 parts of silicon carbide; the preferred diluent used in this example is 692 epoxy reactive diluent, the epoxy resin curing agent used is 593 curing agent, and the coupling agent used is silane coupling agent KH-550.
Example eight: the asphalt pavement heat reflection coating is prepared from the following raw materials in parts by weight: 97.0 parts of epoxy resin, 3.0 parts of liquid phenolic resin, 17.3 parts of rutile type titanium dioxide, 3.7 parts of magnesium silicate powder, 7.0 parts of hollow glass beads, 5.8 parts of sericite powder, 3.7 parts of iron oxide brown powder, 0.9 part of fumed silica, 9.0 parts of diluent, 3.0 parts of propylene glycol, 45.0 parts of epoxy resin curing agent, 0.68 parts of coupling agent and 9.8 parts of silicon carbide; the preferred diluent used in this example is 692 epoxy reactive diluent, the epoxy resin curing agent used is 593 curing agent, and the coupling agent used is silane coupling agent KH-550. The preparation method of the asphalt pavement heat reflection coating in the above embodiment comprises the following steps:
the raw materials were selected according to the parts by weight described in examples one to eight, respectively.
(1) Surface modification treatment of functional filler: mixing and modifying the four functional fillers with a coupling agent, absolute ethyl alcohol and water according to corresponding proportions respectively: after adding the coupling agent to the ethanol solution and sufficiently stirring the solution by using a glass rod, the solution prepared as described above is placed in a three-necked flask and stirred at about 35 ℃ by using an electric stirrer motor (rotating speed of 300 r/min), and the placing process should be slowly and carefully carried out so as to avoid material loss caused by contact of the solution with the wall of the flask. And adding the functional filler after the coupling agent is fully dissolved after stirring for 5-10min and drying in a drying oven. After the filler was completely mixed, the mixture was stirred for 5 minutes, the temperature was increased to 50℃and the rotation speed was adjusted to 500r/min, and the mixture was stirred under these conditions for 60 minutes. After stirring, pouring the solution in the three-neck flask into a beaker, standing at room temperature for 100min, and filtering, drying and grinding after layering the solution to obtain modified functional filler particles.
(2) Preparing a thermal reflection coating material for asphalt pavement: sequentially adding an active diluent and propylene glycol into the epoxy resin, stirring by using a glass rod, and transferring to a magnetic stirrer after three substances are uniformly mixed; adding liquid phenolic resin into the solution, and stirring for 5 minutes by a magnetic stirrer at room temperature and a rotating speed of 150 r/min; the temperature is regulated to 30 ℃ and the rotating speed is regulated to 300r/min, and proper amounts of modified rutile type titanium dioxide, modified magnesium silicate powder, modified sericite powder and fumed silica are sequentially added, and the stirring is carried out for 5-10min before adding new substances each time, so that adverse phenomena of caking, agglomeration and the like of the solution caused by excessive addition at one time are avoided; the speed is reduced to 100r/min, modified hollow glass beads are added and stirred for 10min, and after the stirring is completed, iron oxide brown and silicon carbide are respectively added and stirred for 5min; and after the base material is fully mixed with pigment, filler, auxiliary agent and the like, adding a curing agent and stirring for 5min, thus obtaining the asphalt pavement heat reflection coating.
The asphalt pavement heat reflecting coatings in examples one to eight were tested, and the test items include maximum temperature reduction value measurement, water permeability coefficient measurement, anti-slip value measurement and construction depth measurement, which were used for testing the temperature reduction and road performance of the asphalt pavement heat reflecting coating of the present application, and comparing with the common asphalt pavement without the heat reflecting coating, and the test results are shown in table 1 below.
TABLE 1 Cooling and road Performance test data for asphalt pavement thermal reflective coatings of examples 1-8
。
As can be seen from Table 1, the asphalt pavement heat reflection coating provided by the application has good cooling performance, meets the related requirements of the specification JTG F40-2017 on the construction technical Specification of highway asphalt pavement and the standard JTG F80/1-2017 on the quality inspection and evaluation Standard of highway engineering, that the anti-slip swing value BPN is more than or equal to 45 and the construction depth TD is more than or equal to 0.55mm, and obviously improves the water impermeability of the asphalt pavement after the asphalt pavement heat reflection coating is paved, so that the asphalt pavement heat reflection coating provided by the application has good practical application value.
While certain preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, the present application is intended to include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (6)
1. The asphalt pavement heat reflection coating is characterized by being prepared from the following raw materials in parts by weight:
95 to 99.0 parts of epoxy resin, 3.0 parts of liquid phenolic resin, 15.5 to 17.0 parts of rutile type titanium dioxide, 2.7 to 3.7 parts of magnesium silicate powder, 5.0 to 7.0 parts of hollow glass beads, 4.5 to 5.5 parts of sericite powder, 2.5 to 3.5 parts of iron oxide brown powder, 0.4 to 0.8 part of fumed silica, 7.0 to 9.0 parts of diluent, 2.5 to 3.0 parts of propylene glycol, 25.0 to 30.0 parts of epoxy resin curing agent, 0.55 to 0.66 parts of coupling agent and 8.3 to 9.0 parts of silicon carbide;
the preparation method of the asphalt pavement heat reflection coating comprises the following steps:
(1) Surface modification treatment of functional filler:
uniformly mixing rutile titanium dioxide, a coupling agent, absolute ethyl alcohol and water according to the mass ratio of 1:0.01-0.3:4-6:0.4-0.6 to obtain modified rutile titanium dioxide;
uniformly mixing magnesium silicate powder, a coupling agent, absolute ethyl alcohol and water in a mass ratio of 1:0.01-0.3:4-6:0.4-0.6 to obtain modified magnesium silicate powder;
uniformly mixing the hollow glass beads, a coupling agent, absolute ethyl alcohol and water in a mass ratio of 1:0.01-0.3:4-6:0.4-0.6 to obtain modified hollow glass beads;
uniformly mixing sericite powder, a coupling agent, absolute ethyl alcohol and water according to the mass ratio of 1:0.01-0.3:4-6:0.4-0.6 to obtain modified sericite powder;
(2) Preparing a coating material: sequentially adding an active diluent and propylene glycol into the epoxy resin, uniformly stirring, adding the liquid phenolic resin into the mixture, and continuously stirring; stirring for 4-8 minutes at room temperature and a rotating speed of 140-160 r/min; then adjusting the temperature to 25-35 ℃ and the rotating speed to 240-400 r/min, sequentially adding the modified rutile type titanium dioxide, the modified magnesium silicate powder, the modified sericite powder and the fumed silica, and stirring for 5-10min before adding new substances each time; the rotating speed is reduced to 90-120 r/min, then modified hollow glass beads are added into the mixture and stirred for 7-15 min, and iron oxide brown and silicon carbide are respectively added into the mixture and stirred for 3-8 min; finally adding a curing agent into the mixture and stirring the mixture for 3 to 8 minutes to obtain the modified polyurethane adhesive;
in the step (1), a coupling agent is added into an ethanol solution and is uniformly mixed, and then the mixture is stirred at the temperature of between 30 and 40 ℃ until the coupling agent is fully dissolved, and then a dried functional filler is added; continuously stirring for 3-8 min, then raising the temperature to 45-55 ℃ and stirring for 50-70 min after the rotating speed is adjusted to 450-550 r/min; and then standing and layering at room temperature, filtering out solvent, drying and grinding the solid residue to obtain the modified functional filler.
2. The asphalt pavement heat reflective coating according to claim 1, wherein the coating is prepared from the following raw materials in parts by weight:
97.0 parts of epoxy resin, 3.0 parts of liquid phenolic resin, 15.8 parts of rutile type titanium dioxide, 2.9 parts of magnesium silicate powder, 5.2 parts of hollow glass beads, 4.6 parts of sericite powder, 2.7 parts of iron oxide brown powder, 0.5 part of fumed silica, 7.2 parts of diluent, 2.6 parts of propylene glycol, 26.6 parts of epoxy resin curing agent, 0.57 parts of coupling agent and 8.4 parts of silicon carbide.
3. The bituminous pavement heat reflective coating according to claim 1 or 2, wherein said fumed silica is a commercially available common material.
4. The asphalt pavement heat reflective coating according to claim 1 or 2, wherein said diluent is 692 epoxy reactive diluent.
5. The asphalt pavement heat reflective coating according to claim 1 or 2, wherein said epoxy resin curing agent is 593 curing agent.
6. The bituminous pavement heat reflective coating according to claim 1 or 2, wherein the coupling agent is a silane coupling agent KH-550.
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