CN113604134A - Efficient epoxy-based heat-reflecting coating for asphalt pavement - Google Patents
Efficient epoxy-based heat-reflecting coating for asphalt pavement Download PDFInfo
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- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/004—Reflecting paints; Signal paints
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Abstract
The invention discloses a high-efficiency epoxy-based heat-reflecting coating for an asphalt pavement, which relates to the technical field of coatings and comprises the following raw materials in parts by weight: 100-120 parts of water-based epoxy emulsion, 6-8 parts of precipitated phase silicon dioxide, 2-3 parts of hollow microspheres, 0.3-0.5 part of defoaming agent, 0.2-0.6 part of dispersing agent, 15-25 parts of hybrid sol and 80-90 parts of curing agent. According to the invention, by introducing the hybrid sol into the aqueous epoxy resin system, the hybrid sol can form a hybrid film with a stable structure in the aqueous epoxy resin system, so that the aqueous epoxy resin is not easy to reduce the heat reflectivity under the external action, and the aqueous epoxy resin-based heat reflection coating is coated on the asphalt pavement, has a long-term stable heat reflection effect, and can realize a stable pavement cooling effect for a long time.
Description
Technical Field
The invention belongs to the technical field of coatings, and particularly relates to a high-efficiency epoxy-based heat-reflecting coating for an asphalt pavement.
Background
Asphalt pavement has the advantages of high flatness, good comfort, low noise and the like, and is widely used in road construction in China. The asphalt pavement is widely applied to urban roads due to the advantages of short construction period, easy maintenance and the like, but the asphalt has the characteristic of heat absorption, the absorptivity of the asphalt to solar radiation is as high as 85-95%, and the temperature of the asphalt pavement is as high as more than 60 ℃ in summer; moreover, as the asphalt belongs to a thermoplastic material, the asphalt becomes soft and sticky after absorbing heat, and the problems of rutting, crowding, cracking and the like can occur under the long-term action of vehicle load, thereby not only influencing the normal use of the asphalt pavement, but also intensifying the urban heat island effect; meanwhile, the high-temperature asphalt pavement also releases a large amount of asphalt volatile matters, so that the living environment is rapidly deteriorated. The problem of how to maintain the excellent characteristics of asphalt pavement and simultaneously reduce the surface temperature of the asphalt pavement needs to be solved.
Currently, application of heat reflective coatings to asphalt pavement is the simplest and most efficient method. The heat-reflecting coating for asphalt pavement has the advantages of not changing the original structure of the pavement and only reducing the temperature of the pavement by improving the reflectivity of the pavement, so that the heat-reflecting coating is widely concerned. For example, chinese patent CN2020112037820 discloses a polyurethane heat-reflective coating, a preparation method and a use thereof, the reflective coating adopts phase-change polyurethane resin with a specific structure as a resin base material, so that the coating not only has a good temperature regulation function, but also has good wear resistance; when the reflective coating is applied to an asphalt pavement, a vehicle generates a backward friction force and a downward pressure force on the asphalt pavement during running, and the friction force and the pressure force generate a downward composite force to damage a coating of the reflective coating, so that the heat reflection performance of the coating is reduced.
Disclosure of Invention
The invention aims to solve the existing problems and provides a high-efficiency epoxy-based heat-reflecting coating for an asphalt pavement.
The invention is realized by the following technical scheme:
an efficient epoxy-based heat-reflecting coating for an asphalt pavement comprises the following raw materials in parts by weight: 100-120 parts of water-based epoxy emulsion, 2-3 parts of precipitated phase silicon dioxide, 2-3 parts of hollow microspheres, 0.3-0.5 part of defoaming agent, 0.2-0.6 part of dispersing agent, 15-25 parts of hybrid sol and 80-90 parts of curing agent.
According to the preferred technical scheme, the hybrid sol comprises the following steps:
1) selecting calcium nitrate tetrahydrate and ammonium hydrogen phosphate as a calcium source and a phosphorus source respectively, preparing a solution, mixing the solution with a pH regulator, regulating the pH value of the solution, adding a proper amount of silver nitrate powder, uniformly stirring, carrying out hydrothermal reaction, repeatedly cleaning the obtained product with deionized water and alcohol, and drying to obtain the silver-doped hydroxyapatite micro-nano fiber;
2) adding antimony chloride into distilled water, adding sodium thiosulfate and polyvinylpyrrolidone after stirring, continuously stirring, then pouring the solution after reaction into a hydrothermal reaction kettle, adding silver-doped hydroxyapatite micro-nano fibers, sealing the silver-doped hydroxyapatite micro-nano fibers, adding the silver-doped hydroxyapatite micro-nano fibers into an oven, keeping the temperature, naturally cooling the reaction kettle to room temperature after the reaction is finished, centrifuging the product in the reaction kettle, alternately and repeatedly cleaning the product with distilled water and absolute ethyl alcohol, and drying the product to obtain composite micro-nano fibers;
3) adding a mixed solution of epoxy resin E51 and polyether polyamine into a container, adding an accelerant and a diluent, stirring at room temperature, then adding glacial acetic acid and the composite micro-nano fibers into the system, continuously stirring at room temperature for 30-40min, then adding tetrabutyl zirconate into the system, and continuously stirring at room temperature for 5-8h to obtain the hybrid sol.
According to the preferred technical scheme, the molar ratio of the Ca element to the P element is 10: 6.
In a preferred technical scheme of the invention, the pH regulator is selected from at least one of urea, acetamide and propionamide.
According to the preferred technical scheme, the pH value of the solution is 3-4.
According to the better technical scheme, the addition amount of the silver nitrate is controlled to be 2-8% of Ag/Ag + Ca atomic ratio and 1.5-1.7 of Ca + Ag/P atomic ratio.
According to the preferred technical scheme, the hydrothermal reaction temperature is 160-180 ℃, and the reaction time is 3-6 h.
According to the better technical scheme, the mass-volume ratio of the antimony chloride, the distilled water, the sodium thiosulfate and the polyvinylpyrrolidone is 5.5-6.5g, 600-800mL, 7.6-8.3g and 2.0-3.0 g.
According to the better technical scheme, the stirring speed is 150-230r/min, and the stirring time is 10-15 min.
According to the preferred technical scheme, the continuous stirring time is 30-40 min.
According to the better technical scheme, the addition amount of the silver-doped hydroxyapatite micro-nano fibers accounts for 3.6-4.5% of the total mass of the solution after the liquid phase reaction.
According to the better technical scheme, the temperature of the oven is 180-200 ℃, and the temperature is kept for 23-28 h.
According to the preferred technical scheme, the drying condition is that the drying is carried out for 6-10 hours at the constant temperature of 75-85 ℃.
According to the better technical scheme, the mass volume ratio of the epoxy resin E51 to the polyether polyamine to the accelerator to the diluent to the glacial acetic acid to the tetrabutyl zirconate is 11g to 7.0 to 7.3g to 5 to 7mL to 32 to 36mL to 1 to 3mL to 10 to 12 mL.
According to the preferred technical scheme, the accelerant is benzyl alcohol, and the diluent is acetone.
According to the better technical scheme, the addition amount of the composite micro-nano fiber accounts for 13-18% of the total mass of the hybrid sol system.
According to the preferred technical scheme, the stirring speed is 60-80r/min at room temperature, and the stirring time is 10-20 min.
According to a preferred technical scheme, the preparation method of the water-based epoxy emulsion comprises the following steps: taking 120-130g of polyethylene glycol 4000 and 11.3-12.5g of epoxy resin in a container, melting in a 65-70 ℃ water bath, stirring for 30-40min at 350r/min of 300-70 ℃, slowly adding 0.3-0.6g of ammonium persulfate and 10-15mL of ultrapure water, uniformly mixing, stirring for 4-5h under oil bath at 185 ℃ of 180-320-360 r/min to obtain an emulsifier, placing 15-20g of the emulsifier and 75-90g of epoxy resin in the container, stirring for 4-5h in a water bath at 60-65 ℃, rotating at 3500-4000r/min of rotation speed, dropwise adding water according to 38-42% of solid content, controlling the water addition within 20-30min, and then continuously shearing for 30-40min, wherein the epoxy resin is E51 epoxy resin, the epoxy equivalent (190 +/-5) g/mol, the viscosity at 25 ℃ is 10000-16000 mPa.s, the density is 1.11 g/mL at 25 ℃, and the inorganic chlorine is less than or equal to 50 mg/kg.
According to the better technical scheme, the mass ratio of the water-based epoxy emulsion to the precipitated silica to the hollow micro-beads to the hybrid sol to the defoaming agent to the dispersing agent to the curing agent is 100g to 6-8g to 2-3g to 15-25g to 0.3-0.4g to 0.4-0.5g to 80-90 g.
According to the preferable technical scheme, the defoaming agent is one of polyoxypropylene ethylene oxide glycerol ether and dimethyl silicone oil with different molecular weights or a mixture of the polyoxypropylene ethylene oxide glycerol ether and the dimethyl silicone oil in any proportion.
According to the better technical scheme, the dispersing agent is a dimethyl benzene dissolving solution of methyl silicone oil, and the mass concentration of the methyl silicone oil is 1%.
According to the better technical scheme, the curing agent is a BH-560 aqueous epoxy resin curing agent, the curing agent is a faint yellow uniform fluid, the solid content is 50 +/-2 percent, the active hydrogen equivalent weight is 200 solid, the viscosity is 4000-7000 mPa.s at 25 ℃, the pH value is 8.5, and the relative density is 1.06.
According to the preferred technical scheme, the epoxy-based heat-reflecting coating comprises the following preparation method: and taking the raw materials, sequentially adding precipitated silica, hollow microspheres, hybrid sol, defoaming agent and dispersing agent into the water-based epoxy emulsion, and then adding curing agent, and uniformly stirring at a low speed to obtain the required epoxy-based heat-reflecting coating.
According to the preferred technical scheme, the rotating speed of the low-speed stirring is 10-40r/min, and the stirring time is 1-3 h.
Compared with the prior art, the invention has the following advantages:
firstly, the channels parallel to the C axis and formed by utilizing the spatial network of phosphate tetrahedrons in the hydroxyapatite micro-nanofiber are easy to adsorb metal ions, so that silver ions permeate into the hydroxyapatite micro-nanofiber, partial calcium ions are replaced by the silver ions to enter the inside of crystal lattices of the hydroxyapatite micro-nanofiber, and the grassroots cause micro-expansion of the crystal lattices, so that the surface area of the hydroxyapatite micro-nanofiber is increased, and the subsequent deposition of antimony sulfide nanorods on the surface of the hydroxyapatite micro-nanofiber is facilitated.
Secondly, in the invention, the silver-doped hydroxyapatite micro-nano fiber is used as a deposition matrix, antimony chloride is used as an antimony source, sodium thiosulfate is used as a sulfur source, polyvinylpyrrolidone is used as a surfactant, antimony sulfide nanorods are deposited on the surface of the silver-doped hydroxyapatite micro-nano fiber through hydrothermal reaction, so that the composite micro-nano fiber is formed, and the polyvinylpyrrolidone is used as a structure guiding agent, so that the antimony sulfide nano material is changed into a bundle-shaped structure from slender nanorods, finally the nanorods are in a cauliflower shape, and the nanorods are thinner and denser, so that a large number of cauliflower-shaped nanorods are formed on the surface of the composite micro-nano fiber, the surface area of the composite micro-nano fiber is greatly increased, and the silver-doped hydroxyapatite micro-nano fiber has super-soft toughness, so that the composite micro-nano fiber has good flexibility, therefore, the composite micro-nano fiber has extremely large surface area and excellent flexibility.
Thirdly, in the invention, a sol-gel method is adopted to generate inorganic nano zirconium dioxide clusters in situ in epoxy resin E51, thereby obtaining the epoxy/zirconium dioxide hybrid material with high refractive index, and chemical bonds are formed between side hydroxyl groups on an organic epoxy molecular chain and the inorganic nano clusters, so as to increase the compatibility between organic and inorganic components and prevent the inorganic nano clusters from agglomerating in the system, and composite micro-nano fibers are added, so that the composite micro-nano fibers are easy to contact with the nano zirconium dioxide clusters by utilizing the large surface area of the composite micro-nano fibers, and the nano zirconium dioxide clusters are mutually connected through the composite micro-nano fibers, thereby the nano zirconium dioxide clusters are limited and fixed in a connecting network formed by the composite micro-nano fibers, and the effect of limiting the movement of the inorganic nano zirconium dioxide clusters is achieved.
Fourthly, in the invention, by introducing the hybrid sol into the aqueous epoxy resin system, the hybrid sol can form a hybrid film in the aqueous epoxy resin system, so that the aqueous epoxy resin has good heat reflectivity, and because nano zirconium dioxide clusters are limited in a connecting network formed by the composite micro-nano fibers in the hybrid sol, the nano zirconium dioxide is not easy to move, so that the nano zirconium dioxide is not easy to slide under the external action, meanwhile, the composite micro-nano fibers in the hybrid film also improve the flexibility of the hybrid film, so that the hybrid film is not easy to damage the structure under the external action, thereby improving the structural stability of the hybrid film, so that the aqueous epoxy resin is not easy to reduce the heat reflectivity under the external action, and the aqueous epoxy resin-based heat reflective coating is coated on an asphalt pavement, has long-term stable heat reflection effect and can realize the effect of stable pavement cooling for a long time.
Detailed Description
Example 1
An efficient epoxy-based heat-reflecting coating for an asphalt pavement specifically comprises the following steps:
1) selecting calcium nitrate tetrahydrate and ammonium hydrogen phosphate as a calcium source and a phosphorus source respectively, preparing a solution according to the molar ratio of Ca to P being 10:6, mixing the solution with a urea aqueous solution, adjusting the pH value of the solution to be 3, adding a certain amount of silver nitrate powder, controlling the atomic ratio of Ag/Ag + Ca to be 2% and the atomic ratio of Ca + Ag/P to be 1.5, uniformly stirring, setting the hydrothermal reaction temperature to be 160 ℃, reacting for 3 hours, repeatedly cleaning the obtained product with deionized water and alcohol, and drying the product in an oven at 80 ℃ to obtain the silver-doped hydroxyapatite micro-nano fiber;
2) adding 5.5g of antimony chloride into 600mL of distilled water, stirring for 10min at a speed of 150r/min, then adding 7.6g of sodium thiosulfate and 2.0g of polyvinylpyrrolidone, continuing to stir for 30min, then pouring the reacted solution into a hydrothermal reaction kettle, adding silver-doped hydroxyapatite micro-nano fibers, controlling the addition amount of the silver-doped hydroxyapatite micro-nano fibers to be 3.6% of the total mass of the liquid-phase solution, sealing the solution, adding the solution into a 180 ℃ oven, preserving the temperature for 23h, naturally cooling the reaction kettle to room temperature after the reaction is finished, centrifuging the product in the reaction kettle, alternately and repeatedly cleaning the product with distilled water and absolute ethyl alcohol, and then drying the product in the 75 ℃ oven at constant temperature for 6h to obtain the composite micro-nano fibers;
3) adding a mixed solution of 11g of epoxy resin E51 and 7g of polyether polyamine into a container, adding 5mL of benzyl alcohol and 32mL of acetone, stirring at 60r/min for 10min at room temperature, then adding 1mL of glacial acetic acid and composite micro-nano fibers into the system, controlling the addition of the composite micro-nano fibers to account for 13% of the total system mass, continuing stirring at room temperature for 30min, adding 10mL of tetrabutyl zirconate into the system, and continuing stirring at room temperature for 5h to obtain a hybrid sol;
4) sequentially adding 2 parts of precipitated phase silicon dioxide, 2 parts of hollow microspheres, 15 parts of hybrid sol, 0.3 part of dimethyl silicone oil (with the viscosity of 50 cs) and 0.2 part of dispersing agent into 100 parts of aqueous epoxy emulsion by weight, adding 80 parts of BH-560 aqueous epoxy resin curing agent, and stirring at the low speed of 10r/min for 1h to obtain the required epoxy-based heat-reflecting coating for the asphalt pavement;
wherein the dispersant is a methyl silicone oil dimethylbenzene solution with the mass concentration of 1%;
the preparation method of the water-based epoxy emulsion comprises the following steps: taking 120g of polyethylene glycol 4000 and 11.3g of epoxy resin, melting in a water bath at 65 ℃, stirring for 30min at 300r/min, slowly adding 0.3g of ammonium persulfate and 10mL of ultrapure water, uniformly mixing, stirring for reaction for 4h at 320r/min under a 180 ℃ oil bath to obtain an emulsifier, placing 15g of the emulsifier and 75g of epoxy resin in the container, adding water dropwise at 60 ℃ in the water bath and 3500r/min at the rotating speed, controlling the adding within 20min according to the solid content of 38%, and continuously shearing for 30 min.
Example 2
An efficient epoxy-based heat-reflecting coating for an asphalt pavement specifically comprises the following steps:
1) selecting calcium nitrate tetrahydrate and ammonium hydrogen phosphate as a calcium source and a phosphorus source respectively, preparing a solution according to the molar ratio of Ca to P being 10:6, mixing the solution with a urea aqueous solution, adjusting the pH value of the solution to be 3.5, adding a certain amount of silver nitrate powder, controlling the atomic ratio of Ag to Ca to be 5% and the atomic ratio of Ca to Ag to P to be 1.6, uniformly stirring, setting the hydrothermal reaction temperature to be 170 ℃, reacting for 5 hours, repeatedly cleaning the obtained product with deionized water and alcohol, and drying the product in an oven at 80 ℃ to obtain the silver-doped hydroxyapatite micro-nano fiber;
2) adding 6g of antimony chloride into 700mL of distilled water, stirring for 10min at a speed of 200r/min, adding 8g of sodium thiosulfate and 2.5g of polyvinylpyrrolidone, continuing to stir for 35min, then pouring the reacted solution into a hydrothermal reaction kettle, adding silver-doped hydroxyapatite micro-nano fibers, controlling the addition amount of the silver-doped hydroxyapatite micro-nano fibers to be 4.2% of the total mass of the liquid phase solution, sealing the solution, adding the solution into a 190 ℃ oven, preserving the temperature for 25h, naturally cooling the reaction kettle to room temperature after the reaction is finished, centrifuging the product in the reaction kettle, alternately and repeatedly cleaning the product by using distilled water and absolute ethyl alcohol, and then drying the product in the 80 ℃ oven at constant temperature for 8h to obtain composite micro-nano fibers;
3) adding a mixed solution of 11g of epoxy resin E51 and 7.2g of polyether polyamine into a container, adding 6mL of benzyl alcohol and 35mL of acetone, stirring at 60r/min for 15min at room temperature, then adding 2mL of glacial acetic acid and composite micro-nano fibers into the system, controlling the addition of the composite micro-nano fibers to account for 15% of the total system mass, continuing stirring for 35min at room temperature, adding 11mL of tetrabutyl zirconate into the system, and continuing stirring for 6h at room temperature to obtain hybrid sol;
4) sequentially adding 2.5 parts of precipitated phase silicon dioxide, 2.5 parts of hollow microspheres, 20 parts of hybrid sol, 0.4 part of dimethyl silicone oil (with the viscosity of 50 cs) and 0.5 part of dispersing agent into 110 parts of aqueous epoxy emulsion by weight, adding 85 parts of BH-560 aqueous epoxy resin curing agent, and stirring at low speed of 30r/min for 2 hours to obtain the required epoxy-based heat reflection coating for the asphalt pavement;
wherein the dispersant is a methyl silicone oil dimethylbenzene solution with the mass concentration of 1%;
the preparation method of the water-based epoxy emulsion comprises the following steps: 120g of polyethylene glycol 4000 and 11.5g of epoxy resin are put in a container, melted in a water bath at 65 ℃, stirred for 35min at 350r/min, 0.5g of ammonium persulfate and 12mL of ultrapure water are slowly added, uniformly mixed and stirred for reaction for 4.5h at 350r/min under a 183 ℃ oil bath to obtain an emulsifier, 18g of the emulsifier and 85g of epoxy resin are put in the container, the water bath is carried out at 62 ℃, the rotating speed is 3500r/min, water is dropwise added according to the solid content of 40 percent, the addition is controlled within 25min, and then the shearing is continued for 35 min.
Example 3
An efficient epoxy-based heat-reflecting coating for an asphalt pavement specifically comprises the following steps:
1) selecting calcium nitrate tetrahydrate and ammonium hydrogen phosphate as a calcium source and a phosphorus source respectively, preparing a solution according to the molar ratio of Ca to P being 10:6, mixing the solution with a urea aqueous solution, adjusting the pH value of the solution to be 4, adding a certain amount of silver nitrate powder, controlling the atomic ratio of Ag/Ag to Ca to be 8% and the atomic ratio of Ca to Ag to P to be 1.7, uniformly stirring, setting the hydrothermal reaction temperature to be 180 ℃, reacting for 6 hours, repeatedly cleaning the obtained product with deionized water and alcohol, and drying the product in an oven at 80 ℃ to obtain the silver-doped hydroxyapatite micro-nano fiber;
2) adding 6.5g of antimony chloride into 800mL of distilled water, stirring for 15min at 230r/min, then adding 8.3g of sodium thiosulfate and 3.0g of polyvinylpyrrolidone, continuing to stir for 40min, then pouring the reacted solution into a hydrothermal reaction kettle, adding silver-doped hydroxyapatite micro-nano fibers, controlling the addition amount of the silver-doped hydroxyapatite micro-nano fibers to be 4.5% of the total mass of the liquid-phase solution, sealing the solution, adding the solution into a 200 ℃ oven, preserving the temperature for 28h, naturally cooling the reaction kettle to room temperature after the reaction is finished, centrifuging the product in the reaction kettle, alternately and repeatedly cleaning the product by using distilled water and absolute ethyl alcohol, and then drying the product in the 85 ℃ oven at constant temperature for 10h to obtain the composite micro-nano fibers;
3) adding a mixed solution of 11g of epoxy resin E51 and 7.3g of polyether polyamine into a container, adding 7mL of benzyl alcohol and 36mL of acetone, stirring at 80r/min for 20min at room temperature, then adding 3mL of glacial acetic acid and composite micro-nano fibers into the system, controlling the addition amount of the composite micro-nano fibers to be 18% of the total system mass, continuing to stir for 40min at room temperature, adding 12mL of tetrabutyl zirconate into the system, and continuing to stir for 8h at room temperature to obtain hybrid sol;
4) sequentially adding 3 parts of precipitated phase silicon dioxide, 3 parts of hollow microspheres, 25 parts of hybrid sol, 0.5 part of dimethyl silicone oil (300 cs) and 0.6 part of dispersing agent into 120 parts of aqueous epoxy emulsion by weight, adding 90 parts of BH-560 aqueous epoxy resin curing agent, and stirring at low speed of 40r/min for 3 hours to obtain the required epoxy-based heat-reflecting coating for the asphalt pavement;
wherein the dispersant is a methyl silicone oil dimethylbenzene solution with the mass concentration of 1%;
the preparation method of the water-based epoxy emulsion comprises the following steps: 130g of polyethylene glycol 4000 and 12.5g of epoxy resin are put in a container, melted in a 70 ℃ water bath, stirred for 40min at 350r/min, 0.6g of ammonium persulfate and 15mL of ultrapure water are slowly added, after uniform mixing, the mixture is stirred for 5h at 360r/min under 185 ℃ oil bath to obtain an emulsifier, 20g of the emulsifier and 90g of epoxy resin are put in the container, the water bath is carried out at 65 ℃, the rotating speed is 4000r/min, water is added dropwise according to the solid content of 42 percent, the addition is controlled within 30min, and then the shearing is continued for 40 min.
Comparative example
The preparation method of the conventional common water-based epoxy heat reflection coating comprises the following steps:
sequentially adding 2 parts of precipitated silica, 2 parts of hollow microspheres, 8 parts of rutile titanium dioxide, 0.3 part of dimethyl silicone oil (with the viscosity of 50 cs) and 0.2 part of dispersing agent into 100 parts of aqueous epoxy emulsion by weight, adding 80 parts of BH-560 aqueous epoxy resin curing agent, and stirring at the low speed of 10r/min for 1h to obtain the aqueous epoxy heat reflection coating; wherein the dispersant is a methyl silicone oil dimethylbenzene solution with the mass concentration of 1%; the preparation method of the water-based epoxy emulsion comprises the following steps: taking 120g of polyethylene glycol 4000 and 11.3g of epoxy resin, melting in a water bath at 65 ℃, stirring for 30min at 300r/min, slowly adding 0.3g of ammonium persulfate and 10mL of ultrapure water, uniformly mixing, stirring for reaction for 4h at 320r/min under a 180 ℃ oil bath to obtain an emulsifier, placing 15g of the emulsifier and 75g of epoxy resin in the container, adding water dropwise at 60 ℃ in the water bath and 3500r/min at the rotating speed, controlling the adding within 20min according to the solid content of 38%, and continuously shearing for 30 min.
Performance testing
1. Adhesion properties of heat reflective coatings
1.1 test methods
The epoxy-based heat-reflecting coating provided in example 1 was coated on the surface of a molded AC-13 asphalt concrete rut plate test piece at a coating weight of 1.0kg/cm2After the test piece is completely cured, the puller of the drawing tester is bonded on the surface of the coating by adopting quick-drying high-strength AB glue, and the force of the puller separated from the test piece is tested after 2 h.
1.2 results and analysis
The force when the pull head is separated from the test piece is measured to be 1.38kN, the self adhesion of the coating is excellent, most of the tensile fracture surface is the bonding surface of asphalt and stone, and the epoxy-based heat-reflecting coating has excellent adhesion with an asphalt pavement.
2. Cooling effect of heat reflective coating
2.1 test methods
Taking three AC-13 asphalt concrete rut test pieces, wherein one of the three test pieces is used as a blank control plate, and the other two test pieces are coated according to the coating weight of 1.0kg/cm2The coatings provided in example 1 and comparative example were applied, respectively, and then they were placed in a clear place where they could be directly exposed to sunlight, a temperature sensor was buried in a hole 2cm from the surface of the test piece, the temperature change of the test piece during the day was recorded, and the cooling value was calculated.
2.2 results and analysis
Under solar radiation, the temperature of three times is increased and then reduced along with the passage of time, the cooling value is similar in change trend, when 14:00-15:00 in the afternoon, the outdoor temperature is 38.5 ℃, the time temperature is also the highest, and the cooling value is the largest at the time, wherein the cooling value of a test piece coated with the coating of the embodiment 1 is 8.5 ℃, the temperature of a test piece coated with the coating of the comparative example is 7.9 ℃, which shows that the coatings provided by the embodiment 1 and the comparative example have the cooling effect on the test piece, and the cooling effect of the coating provided by the embodiment 1 is better than that of the coating provided by the comparative example.
3. Cooling effect of heat reflection coating after rut test
3.1 test methods
Selecting standard AC-13 asphalt concrete test pieces (the size is 300mm multiplied by 50 mm), and coating weight is 1.0kg/cm2Respectively adopting the coatings provided by the embodiment 1 and the comparative example for coating, after the coatings are completely cured, walking on a bearing vehicle with a rolling wheel pressure of 10kN at a specified temperature of 60 ℃, wherein the walking speed of the bearing vehicle is 6 times of round trip/minute, the walking distance is 300mm, the walking times are 800 times, after the test is finished, placing the test piece in a spacious place which can be directly exposed to sunlight, embedding a temperature sensor into a hole 2cm away from the surface of the test piece, recording the temperature change of the test piece in one day, and calculating the cooling value.
3.1 results and analysis
Under solar radiation, the temperature of three times is increased and then reduced along with the passage of time, the cooling value is similar variation trend, when 14:00-15:00 in the afternoon, the outdoor temperature is 38.5 ℃, the time temperature is also the highest, and the cooling value is the largest at the moment, wherein the test piece coated with the coating of the embodiment 1 has the cooling value of 8.4 ℃, the test piece coated with the coating of the comparative example has the cooling value of 7.0 ℃, which shows that the coating of the coating provided by the embodiment 1 still has excellent cooling effect under the repeated rolling of a bearing vehicle, and obvious loss does not occur; the coating of the paint provided by the comparative example is repeatedly rolled down by a carrying vehicle, and the loss of the cooling effect is obvious.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the present invention.
Claims (8)
1. The high-efficiency epoxy-based heat-reflecting coating for the asphalt pavement is characterized by comprising the following raw materials in parts by weight: 100-120 parts of water-based epoxy emulsion, 2-3 parts of precipitated phase silicon dioxide, 2-3 parts of hollow microspheres, 0.3-0.5 part of defoaming agent, 0.2-0.6 part of dispersing agent, 15-25 parts of hybrid sol and 80-90 parts of curing agent.
2. A high efficiency epoxy based heat reflective coating for asphalt pavement according to claim 1, wherein said hybrid sol comprises the steps of:
1) doping silver ions into the inside of a hydroxyapatite micro-nano fiber lattice to obtain silver-doped hydroxyapatite micro-nano fibers, pouring a solution obtained after an antimony source and a sulfur source react into a hydrothermal reaction kettle, adding the silver-doped hydroxyapatite micro-nano fibers, sealing, adding into an oven, and keeping the temperature to obtain composite micro-nano fibers;
2) adding composite micro-nano fibers into the mixed solution of the epoxy resin E51 and the polyether polyamine, uniformly mixing, adding tetrabutyl zirconate, and uniformly stirring to obtain the hybrid sol.
3. The high-efficiency epoxy-based heat-reflecting paint for the asphalt pavement as claimed in claim 2, wherein the mass ratio of the antimony source to the sulfur source is 5.5-6.5: 7.6-8.3.
4. The high-efficiency epoxy-based heat-reflecting coating for the asphalt pavement according to claim 2, wherein the addition amount of the silver-doped hydroxyapatite micro-nano fibers accounts for 3.6-4.5% of the total mass of the solution after the reaction.
5. The efficient epoxy-based heat-reflecting coating for the asphalt pavement as claimed in claim 2, wherein the oven temperature is 180 ℃ and 200 ℃, and the heat preservation time is 23-28 h.
6. The high-efficiency epoxy-based heat-reflecting paint for asphalt pavements as claimed in claim 2, wherein the mass-volume ratio of the epoxy resin E51, the polyether polyamine and the tetrabutyl zirconate is 11g:7.0-7.3g:10-12 mL.
7. The high-efficiency epoxy-based heat-reflecting coating for the asphalt pavement according to claim 2, wherein the addition amount of the composite micro-nanofibers accounts for 13-18% of the total mass of the hybrid sol system.
8. The high-efficiency epoxy-based heat-reflecting paint for asphalt pavements as claimed in any one of claims 1 to 7, characterized in that the epoxy-based heat-reflecting paint comprises the following preparation method: and taking the raw materials, sequentially adding precipitated silica, hollow microspheres, hybrid sol, defoaming agent and dispersing agent into the water-based epoxy emulsion, and then adding curing agent, and uniformly stirring at a low speed to obtain the required epoxy-based heat-reflecting coating.
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