CN115232495A - Method for preventing asphalt adhesion and application - Google Patents

Method for preventing asphalt adhesion and application Download PDF

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Publication number
CN115232495A
CN115232495A CN202211056235.3A CN202211056235A CN115232495A CN 115232495 A CN115232495 A CN 115232495A CN 202211056235 A CN202211056235 A CN 202211056235A CN 115232495 A CN115232495 A CN 115232495A
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spraying
asphalt
super
liquid
hydrophobic
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王德辉
邓仲前
邓旭
李雪松
姜天凯
王旭亮
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Shandong Chambroad Logistics Co ltd
University of Electronic Science and Technology of China
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Shandong Chambroad Logistics Co ltd
University of Electronic Science and Technology of China
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Priority to CN202211056235.3A priority Critical patent/CN115232495A/en
Publication of CN115232495A publication Critical patent/CN115232495A/en
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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
    • C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • B05D7/54—No clear coat specified
    • 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
    • C09D123/00—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers
    • 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
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04—Polyurethanes

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Paints Or Removers (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

The invention provides a method for preventing asphalt from adhering and application thereof, which can realize complete rejection of liquid asphalt by designing and preparing a nano material with a micro-nano composite structure, processing the nano material with low surface energy and coating the nano material to form a coating, thereby achieving the state of super-hydrophobic asphalt and preventing asphalt from adhering. Under the high temperature or low temperature state, the asphalt has extremely low adhesion on the surface, and can automatically separate under the action of gravity. The material can be prepared into dispersion liquid, and the super-hydrophobic asphalt surface with high stability and strong base adhesion is prepared on the surfaces of various substrates by spraying, brushing, blade coating, dip coating, drop coating and other modes.

Description

Method for preventing asphalt adhesion and application
Technical Field
The invention belongs to the technical field of super-hydrophobic materials, and particularly relates to a method for preventing asphalt adhesion and application thereof.
Background
Asphalt is a black-brown complex mixture composed of hydrocarbons with different molecular weights and nonmetallic derivatives thereof, exists in a semi-solid petroleum form at normal temperature, and is widely applied to pavement paving materials. Due to the semi-solid nature of bitumen and the low surface energy and high adhesion of the high temperature liquid, great difficulties are presented to its rapid handling during transportation. At present, the asphalt is generally loaded and unloaded after the fluidity of the asphalt is improved by a heating method, and if the transportation distance is long, the asphalt needs to be heated once when being unloaded. Heating consumes a large amount of energy and repeated heating results in a decrease in the quality of asphalt. More seriously, the high-temperature liquid asphalt has high viscosity, strong adhesiveness, extremely long time consumption in the unloading process and extremely high time cost. Therefore, the problems of high energy consumption, long time consumption, large residual quantity and the like exist in the transportation, loading and unloading process of the asphalt, and if a functional surface material can be developed to reduce the adhesion between the semi-solid or liquid asphalt and the surface, the transportation, loading and unloading problems of the asphalt are expected to be solved.
The super-amphiphobic (hydrophobic and oleophobic) surface can repel liquid with low surface tension, has extremely low solid-liquid contact area and shows extremely small surface adhesion force or friction force. The development of the asphalt adhesion preventing surface based on the super-amphiphobic material has extremely high feasibility. However, the use of superamphiphobic surfaces in asphalt transport, handling and loading has not been reported so far.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a preparation method of an asphalt adhesion preventing coating layer, aiming at preparing an ultraphobic asphalt surface with higher mechanical stability and chemical stability by combining simple spraying and curing modes, so that the ultraphobic asphalt surface shows low adhesion strength to solid asphalt and an ultraphobic effect to high-temperature liquid asphalt.
In order to realize the purpose of the invention, the invention adopts the following technical scheme:
a preparation method of an asphalt adhesion preventing coating layer comprises the following steps:
step one, preparing a silicon dioxide material with a micro-nano composite structure:
tetraethyl orthosilicate, ethanol and ammonia water are mixed according to a certain proportion, then silica particles with certain particle size are added, magnetic stirring is carried out for a period of time at a certain stirring speed, hydrophilic silica suspension is obtained, and the silica suspension is filtered, washed and dried to obtain a silica material with a micro-nano composite structure;
step two, preparing super-hydrophobic spraying liquid:
solution method: mixing the silicon dioxide material with the micro-nano composite structure obtained in the step one with ethanol or ethyl acetate to obtain an absolute ethanol solution or an ethyl acetate solution thereof, adding a certain amount of perfluoro octyl trichlorosilane, and stirring to perform low surface energy molecular modification on the mixture to obtain an ultra-hydrophobic asphalt spraying liquid A; alternatively, the first and second liquid crystal display panels may be,
vacuum method: putting the silicon dioxide material with the micro-nano composite structure obtained in the step one and a certain amount of perfluorooctyl trichlorosilane into a vapor deposition chamber, vacuumizing to a low-pressure state, sealing, standing at room temperature for a period of time, and taking out after the vacuum is finished to obtain silicon dioxide powder modified by low surface energy molecules; then dispersing the silicon dioxide powder modified by low surface energy molecules in one of absolute ethyl alcohol, ethyl acetate or cyclohexane, and stirring for a certain time at room temperature to obtain super-hydrophobic asphalt spraying liquid A;
step three: preparing primer spraying liquid:
dissolving one of polyolefin, polyurethane, fluorine-containing resin or epoxy resin which can be polymerized and solidified in one of absolute ethyl alcohol, ethyl acetate, butyl acetate or cyclohexane, and stirring for a certain time at room temperature to obtain primer spraying liquid B;
step four: measuring a certain amount of primer spraying liquid B, placing the primer spraying liquid B in a spray gun, controlling the spraying pressure and the spraying distance, and uniformly spraying the primer spraying liquid B for a certain time by aiming at a required substrate to obtain a spraying layer A;
step five: measuring a certain amount of super-hydrophobic asphalt spraying liquid A, placing the super-hydrophobic asphalt spraying liquid A in a spray gun, controlling the spraying pressure and the spraying distance, and uniformly spraying the super-hydrophobic asphalt spraying liquid A for a certain time to obtain a spraying layer B, so as to obtain a composite spraying layer;
step six: and (3) placing the sprayed sample containing the composite spraying layer in an oven for a certain time to obtain a high-stability super-hydrophobic asphalt surface, namely the prepared asphalt adhesion preventing coating layer.
Preferably, in the first step, the volume ratio of the tetraethyl orthosilicate to the ethanol to the ammonia water is 1:2:1 to 1:50:1, the particle size of the silicon dioxide particles is 10-100 nm, the stirring speed of magnetic stirring is 200-1000 r/min, and the stirring time is 0.5-24 h.
Preferably, in the second step, when the solution method is adopted, the dosage of the perfluorooctyl trichlorosilane is 100 to 1000uL, and when the vacuum method is adopted, the dosage of the perfluorooctyl trichlorosilane is 0.5 to 20mL; the perfluorooctyl trichlorosilane can also be replaced by perfluorodecyl trichlorosilane, perfluorododecyl trichlorosilane or perfluorodecyl triethoxysilane; the vacuum pumping to the low-pressure state means that the pressure in the vapor deposition chamber is controlled to be 0.5-3 kPa, the room-temperature standing time is 0.5-12 h, and the stirring time is 0.5-12 h; the concentration of the super-hydrophobic asphalt spraying liquid A obtained by dispersion is 1-50 mg/mL.
Compared with the prior art, the invention has the beneficial effects that:
the super-hydrophobic material is developed and used for preventing the asphalt from adhering to the surface, so that the problems of long time consumption and much residue in the asphalt transportation, loading and unloading process in the prior art are solved; the super-hydrophobic asphalt surface with high stability and strong substrate adhesion is prepared by designing a micro-nano composite structure and a spraying mode, and the prepared super-hydrophobic asphalt surface has higher mechanical stability and chemical stability by combining simple spraying and curing modes, shows low adhesion strength to solid asphalt and shows a super-hydrophobic effect to high-temperature liquid asphalt.
Drawings
FIG. 1 is a SEM image of the coating obtained in the first embodiment of the present invention;
FIG. 2 is a schematic graph showing the contact angle of a coating obtained by asphalt in example one of the present invention at 180 ℃;
FIG. 3 is a schematic diagram showing the static contact angle of hexadecane in the coating obtained in the first embodiment of the present invention;
FIG. 4 is a graph of adhesion change after asphalt tack-strip cycle;
FIG. 5 is a schematic view of the microstructure of an armored inverted pyramid structure filled with an anti-asphaltic adhesion coating layer.
Detailed Description
The technical solution of the present invention is further described below with reference to several embodiments and the accompanying drawings. It is to be noted that the following examples and terms are intended to facilitate the understanding of the present invention, and do not have any limiting effect thereon.
As shown in fig. 1 to 4, the present invention provides a method for preparing an asphalt adhesion preventing coating layer, which comprises the steps of:
step one, preparing a silicon dioxide material with a micro-nano composite structure:
tetraethyl orthosilicate, ethanol and ammonia water are mixed according to a certain proportion, then silica particles with certain particle size are added, magnetic stirring is carried out for a period of time at a certain stirring speed, hydrophilic silica suspension is obtained, and the silica suspension is filtered, washed and dried to obtain a silica material with a micro-nano composite structure;
step two, preparing super-hydrophobic spraying liquid:
solution method: mixing the silicon dioxide material with the micro-nano composite structure obtained in the step one with ethanol or ethyl acetate to obtain an absolute ethanol solution or an ethyl acetate solution thereof, adding a certain amount of perfluoro octyl trichlorosilane, and stirring to perform low surface energy molecular modification on the mixture to obtain an ultra-hydrophobic asphalt spraying liquid A; alternatively, the first and second electrodes may be,
vacuum method: putting the silicon dioxide material with the micro-nano composite structure obtained in the step one and a certain amount of perfluorooctyl trichlorosilane into a vapor deposition chamber (separately placed), vacuumizing to a low-pressure state, sealing (preferably stirring), standing at room temperature for a period of time, and taking out after the standing to obtain silicon dioxide powder modified by low surface energy molecules; then dispersing the silicon dioxide powder modified by low surface energy molecules in one of absolute ethyl alcohol, ethyl acetate or cyclohexane, and stirring for a certain time at room temperature to obtain super-hydrophobic asphalt spraying liquid A;
step three: preparing primer spraying liquid:
dissolving one of polyolefin, polyurethane, fluorine-containing resin or epoxy resin which can be polymerized and solidified in one of absolute ethyl alcohol, ethyl acetate, butyl acetate or cyclohexane, and stirring for a certain time at room temperature to obtain primer spraying liquid B;
step four: measuring a certain amount of primer spraying liquid B, placing the primer spraying liquid B in a spray gun, controlling the spraying pressure and the spraying distance, and uniformly spraying the primer spraying liquid B for a certain time by aiming at a required substrate to obtain a spraying layer A;
step five: measuring a certain amount of super-hydrophobic asphalt spraying liquid A, placing the super-hydrophobic asphalt spraying liquid A in a spray gun, controlling the spraying pressure and the spraying distance, and uniformly spraying the super-hydrophobic asphalt spraying liquid A for a certain time to obtain a spraying layer B, so as to obtain a composite spraying layer;
step six: and (3) placing the sprayed sample containing the composite spraying layer in an oven for a certain time to obtain a high-stability super-hydrophobic asphalt surface, namely the prepared asphalt adhesion preventing coating layer.
Preferably, in the first step, the volume ratio of the tetraethyl orthosilicate to the ethanol to the ammonia water is 1:2:1 to 1:50:1, the particle size of the silicon dioxide particles is 10-100 nm, the stirring speed of magnetic stirring is 200-1000 r/min, and the stirring time is 0.5-24 h.
Preferably, in the second step, when the solution method is adopted, the dosage of the perfluorooctyl trichlorosilane is 100 to 1000uL, and when the vacuum method is adopted, the dosage of the perfluorooctyl trichlorosilane is 0.5 to 20mL; the perfluorooctyl trichlorosilane can also be replaced by perfluorodecyl trichlorosilane, perfluorododecyl trichlorosilane or perfluorodecyl triethoxysilane; the vacuum pumping to the low pressure state means that the pressure in the vapor deposition chamber is controlled to be 0.5-3 kPa, preferably 2kPa, the standing time at room temperature is 0.5-12 h, and the stirring time is 0.5-12 h; the concentration of the super-hydrophobic asphalt spraying liquid A obtained by dispersion is 1-50 mg/mL.
Preferably, in the third step, the concentration of the primer spray coating liquid B obtained by dispersion is 1-100 mg/mL.
In the fourth step, the spraying pressure is 0.1-1 MPa, the spraying distance is 5-30 cm, and the spraying thickness is controlled to be 10 nm-5 mm.
In the fifth step, the spraying pressure is 0.1-1 MPa, the spraying distance is 5-30 cm, the spraying thickness is controlled to be 100 nm-15 mm, and the thickness of the spraying layer B is larger than that of the spraying layer A.
Preferably, in the sixth step, the temperature of the oven is controlled to be 40-200 ℃, and the curing time is 0.5-48 h.
Preferably, in the formation process of the composite spray layer in the fourth and fifth steps, the super-hydrophobic asphalt spray coating liquid A and the primer spray coating liquid B are mixed to obtain a mixed liquid C, and then the mixed liquid C is sprayed on the substrate.
More preferably, after the mixed solution C is sprayed, a layer of the super-hydrophobic asphalt spraying solution A is further sprayed (the mechanical stability is higher).
In addition, the prepared asphalt adhesion preventing coating layer can be used for asphalt adhesion and can also be used for preventing adhesion of high-adhesion liquid such as marine fuel, heavy oil, latex and the like. The adopted silicon dioxide particles can be replaced by titanium dioxide, aluminum oxide and other nano particles.
In order to explain the technical scheme of the present invention in more detail, the following examples of the present invention will be given in conjunction with specific experimental operations and processes for preparing an anti-asphaltic adhesion coating layer, as one skilled in the art should understand that the parameter data involved are only laboratory data and do not have any limiting effect on the present invention, and if the present invention is applied to actual mass production, the corresponding parameters will be adjusted accordingly.
Example one
Mixing 6mL of tetraethyl orthosilicate, 44mL of anhydrous ethanol and 6mL of ammonia water (the mass fraction is 28%) and placing the mixture in a beaker, weighing 0.1g of 12nm hydrophilic silica and placing the mixture in the beaker, stirring the mixture for one hour at the rotating speed of 500r/min, and then placing the beaker in an oven to dry the beaker at the temperature of 60 ℃ to obtain hydrophilic silica powder with a composite micro-nano structure;
preparing the hydrophilic silicon dioxide powder into 30mg/mL absolute ethyl alcohol solution, adding 200uL of perfluorooctyl trichlorosilane, and stirring at the rotating speed of 500r/min for one hour to obtain super-hydrophobic asphalt spraying liquid A;
preparing polyurethane with the same concentration, and dispersing the polyurethane in ethyl acetate to obtain primer spraying liquid B;
measuring 5mL of primer spraying liquid B, placing the primer spraying liquid B in a spray gun, controlling the spraying pressure to be 0.3MPa, and uniformly spraying the primer spraying liquid B at a spraying distance of 15cm in a range of 24 × 60mm 2 Measuring 5mL of the super-hydrophobic asphalt spraying liquid A on the surface of the glass sheet, and repeating the spraying operation;
placing the sprayed sample in a 60 ℃ drying oven for 12 hours to obtain a stable asphalt adhesion preventing coating layer;
measuring the asphalt conveying performance of the obtained asphalt adhesion preventing coating layer under experimental conditions, wherein a 10uL asphalt contact angle is about 152.6 degrees and a rolling angle is about 8.5 degrees at 180 ℃; the adhesion strength after cooling of the asphalt was 0.05kPa, and the adhesion strength after fifty asphalt adhesion-peel cycles was 10.45kPa.
Example two
Mixing 6mL of tetraethyl orthosilicate, 44mL of anhydrous ethanol and 6mL of ammonia water (the mass fraction is 28%) and placing the mixture in a beaker, weighing 0.5g of 20nm hydrophilic silica and placing the mixture in the beaker, stirring the mixture for one hour at the rotating speed of 500r/min, and then placing the beaker in an oven to dry the beaker at the temperature of 60 ℃ to obtain hydrophilic silica powder with a composite micro-nano structure;
preparing the hydrophilic silicon dioxide powder into 50mg/mL ethyl acetate solution, adding 200uL perfluorodecyl triethoxysilane, and stirring at the rotating speed of 500r/min for one hour to obtain super-hydrophobic asphalt spraying liquid A;
preparing polyolefin with the same concentration and dispersing the polyolefin in ethyl acetate to obtain primer spraying liquid B;
measuring 5mL of primer spraying liquid B, placing the primer spraying liquid B in a spray gun, and controllingSpraying at a spraying pressure of 0.3MPa and a spraying distance of 15cm at 24 × 60mm 2 Measuring 5mL of the super-hydrophobic asphalt spraying liquid A on the surface of the glass sheet, and repeating the spraying operation;
placing the sprayed sample in a 60 ℃ drying oven for 12 hours to obtain a stable asphalt adhesion preventing coating layer;
measuring the asphalt conveying performance of the obtained asphalt adhesion preventing coating layer under experimental conditions, wherein the 10uL asphalt contact angle is about 151.2 degrees at 180 ℃, and the rolling angle is about 12.4 degrees; the adhesion strength after cooling of the bitumen was 0.065kPa, and after fifty bitumen adhesion-peel cycles the adhesion strength was 8.97kPa.
EXAMPLE III
Mixing 6mL of tetraethyl orthosilicate, 44mL of anhydrous ethanol and 6mL of ammonia water (the mass fraction is 28%) and placing the mixture in a beaker, weighing 0.4g of 20nm hydrophilic silica and placing the mixture in the beaker, stirring the mixture for one hour at the rotating speed of 500r/min, and then placing the beaker in an oven to dry the beaker at the temperature of 60 ℃ to obtain hydrophilic silica powder with a composite micro-nano structure;
placing the hydrophilic silicon dioxide powder and 1mL of perfluorooctyl trichlorosilane into a vapor deposition chamber, vacuumizing to about 2kPa, standing at room temperature in a closed manner for a period of time, and taking out after the vacuum is finished to obtain the low-surface-energy modified composite micro-nano silicon dioxide powder; preparing the composite micro-nano silicon dioxide powder into 50mg/mL absolute ethyl alcohol solution to obtain super-hydrophobic asphalt spraying liquid A;
preparing polyurethane with the same concentration, and dispersing the polyurethane in ethyl acetate to obtain primer spraying liquid B;
blending the super-hydrophobic asphalt spraying solution A and the primer spraying solution B in equal volume, and performing ultrasonic treatment for 10min to obtain a blended super-hydrophobic asphalt spraying solution C; measuring 5mL of spraying liquid C, placing in a spray gun, controlling the spraying pressure to be 0.3MPa, and uniformly spraying at a spraying distance of 15cm and at 24 × 60mm 2 Placing the sprayed sample on the surface of a glass sheet in a 60 ℃ oven for 18h to obtain an asphalt adhesion preventing coating layer;
the asphalt conveying performance of the obtained asphalt adhesion preventing coating layer is measured under the experimental conditions, and the 10uL asphalt contact angle is about 151 degrees and the rolling angle is about 10 degrees at 180 degrees. The adhesion strength after cooling of the asphalt was 0.048kPa, and the adhesion strength after fifty asphalt adhesion-peel cycles was 9.55kPa.
Example four
Mixing 6mL of tetraethyl orthosilicate, 44mL of anhydrous ethanol and 6mL of ammonia water (the mass fraction is 28%) and placing the mixture in a beaker, weighing 0.5g of 20nm hydrophilic silica and placing the mixture in the beaker, stirring the mixture for one hour at the rotating speed of 500r/min, and then placing the beaker in an oven to dry the beaker at the temperature of 60 ℃ to obtain hydrophilic silica powder with a composite micro-nano structure;
putting 1mL of perfluoro octyl trichlorosilane of the hydrophilic silicon dioxide powder into a vapor deposition chamber, vacuumizing to about 2kPa, standing at room temperature in a closed manner for a period of time, and taking out after the vacuum is finished to obtain the low-surface-energy modified composite micro-nano silicon dioxide powder; preparing the composite micro-nano silicon dioxide powder into 50mg/mL absolute ethyl alcohol solution to obtain super-hydrophobic asphalt spraying liquid A;
preparing polyurethane with the same concentration and dispersing the polyurethane in ethyl acetate to obtain primer spraying liquid B;
blending the super-hydrophobic asphalt spraying solution A and the primer spraying solution B in equal volume, and performing ultrasonic treatment for 10min to obtain a blended super-hydrophobic asphalt spraying solution C; measuring 5mL of spraying liquid C, placing in a spray gun, controlling the spraying pressure to be 0.3MPa, and uniformly spraying at 24 × 60mm at a spraying distance of 15cm 2 Measuring 5mL of the super-hydrophobic asphalt spraying liquid A on the surface of the glass sheet, and repeating the spraying operation; placing the sprayed sample in an oven at 80 ℃ for 12 hours to obtain an asphalt adhesion preventing coating layer;
asphalt transfer performance of the obtained asphalt adhesion preventing coating layer was measured under experimental conditions, and a 10uL asphalt contact angle at 180 ℃ was about 154 °, a rolling angle was about 8.6 °, an adhesion strength after asphalt cooling was 0.055kPa, and an adhesion strength after fifty asphalt adhesion-peel cycles was 11.04kPa.
EXAMPLE five
Mixing 6mL of tetraethyl orthosilicate, 44mL of anhydrous ethanol and 6mL of ammonia water (the mass fraction is 28%) and placing the mixture in a beaker, weighing 0.5g of 20nm hydrophilic silica and placing the mixture in the beaker, stirring the mixture for one hour at the rotating speed of 500r/min, and then placing the beaker in an oven to dry the beaker at the temperature of 60 ℃ to obtain hydrophilic silica powder with a composite micro-nano structure;
putting 1mL of perfluoro octyl trichlorosilane of the hydrophilic silicon dioxide powder into a vapor deposition chamber, vacuumizing to about 2kPa, standing at room temperature in a closed manner for a period of time, and taking out after the vacuum is finished to obtain the low-surface-energy modified composite micro-nano silicon dioxide powder; preparing the composite micro-nano silicon dioxide powder into 50mg/mL absolute ethyl alcohol solution to obtain super-hydrophobic asphalt spraying liquid A;
preparing polyurethane with the same concentration, and dispersing the polyurethane in ethyl acetate to obtain primer spraying liquid B;
blending the super-hydrophobic asphalt spraying solution A and the primer spraying solution B in equal volume, and performing ultrasonic treatment for 10min to obtain a blended super-hydrophobic asphalt spraying solution C; measuring 5mL of spraying liquid C, placing the spraying liquid C in a spray gun, controlling the spraying pressure to be 0.3MPa and the spraying distance to be 15cm, introducing a continuous armor microstructure framework (the continuous armor microstructure framework can prepare an armor structure on the surface of a silicon wafer, ceramic, metal, glass and other universal base materials by utilizing photoetching, cold/hot pressing, sand blasting and other micro-processing technologies) in order to further improve the mechanical stability and durability of a coating: uniformly spraying on the surface of the mixture at 24X 60mm 2 Armoring the surface of the inverted pyramid structure, measuring 5mL of the super-hydrophobic asphalt spraying liquid A, and repeating the spraying operation; placing the sprayed sample in an oven at 80 ℃ for 12 hours to obtain an asphalt adhesion preventing coating layer;
asphalt conveying performance of the obtained asphalt adhesion preventing coating layer was measured under experimental conditions, and a 10uL asphalt contact angle at 180 ℃ was about 153.4 °, a rolling angle was about 8.9 °, an adhesion strength after cooling of asphalt was 0.145kPa, and an adhesion strength after fifty asphalt adhesion-peel cycles was 15.04kPa.
Comparative example
The asphalt conveying performance of the substrate is measured by adopting a conventional polytetrafluoroethylene coating under experimental conditions, the asphalt contact angle is about 54 degrees at 180 ℃, the rolling angle (roll-fixed) cannot be measured, the adhesion strength of the cooled asphalt is 130.4kPa, and residual asphalt is adhered to the surface of the polytetrafluoroethylene.
The examples and the comparative examples show that the anti-asphalt adhesion coating layer of the invention has better asphalt conveying performance, low adhesion strength to cooled solid asphalt and good super-hydrophobic effect to high-temperature liquid asphalt (the asphalt is in a liquid state at high temperature, the super-hydrophobic effect is reflected by a contact angle and a rolling angle, and the larger the contact angle, the better the super-hydrophobic effect), and can be used for anti-adhesion of high-adhesion liquid such as marine fuel, heavy oil, latex and the like. In addition, under experimental conditions, the asphalt conveying performance parameters measured by the solution method and the vacuum method are not greatly different, but in the actual production process, the super-hydrophobic coating prepared by the vacuum method of the invention has better performance, which is probably related to factors such as easy introduction of impurities by the solution method and the like.
The embodiments described above are intended to illustrate the technical solutions of the present invention in detail, and it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modification, supplement or similar substitution made within the scope of the principles of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. The preparation method of the asphalt adhesion preventing coating layer is characterized by comprising the following steps of:
step one, preparing a silicon dioxide material with a micro-nano composite structure:
tetraethyl orthosilicate, ethanol and ammonia water are mixed according to a certain proportion, then silica particles with certain particle size are added, the mixture is stirred for a period of time at a certain stirring speed, hydrophilic silica suspension is obtained, and the silica suspension is filtered, washed and dried to obtain a silica material with a micro-nano composite structure;
step two, preparing the super-hydrophobic asphalt spraying liquid:
the super-hydrophobic asphalt spraying liquid is prepared by a solution method or a vacuum method, wherein,
solution method: mixing the silicon dioxide material with the micro-nano composite structure obtained in the step one with ethanol or ethyl acetate to obtain an absolute ethanol solution or an ethyl acetate solution thereof, adding a certain amount of perfluoro octyl trichlorosilane, and stirring to perform low surface energy molecular modification on the mixture to obtain an ultra-hydrophobic asphalt spraying liquid A; alternatively, the first and second electrodes may be,
vacuum method: putting the silicon dioxide material with the micro-nano composite structure obtained in the step one and a certain amount of perfluorooctyl trichlorosilane into a vapor deposition chamber, vacuumizing to a low-pressure state, sealing, standing at room temperature for a period of time, and taking out after the vacuum is finished to obtain silicon dioxide powder modified by low surface energy molecules; then dispersing the silicon dioxide powder modified by low surface energy molecules in one of absolute ethyl alcohol, ethyl acetate or cyclohexane, and stirring for a certain time at room temperature to obtain super-hydrophobic asphalt spraying liquid A;
step three: preparing primer spraying liquid:
dissolving one of polyolefin, polyurethane, fluorine-containing resin or epoxy resin which can be polymerized and solidified in one of absolute ethyl alcohol, ethyl acetate, butyl acetate or cyclohexane, and stirring for a certain time at room temperature to obtain primer spraying liquid B;
step four: measuring a certain amount of primer spraying liquid B, placing the primer spraying liquid B in a spray gun, controlling the spraying pressure and the spraying distance, and uniformly spraying the primer spraying liquid B for a certain time by aiming at a required substrate to obtain a spraying layer A;
step five: measuring a certain amount of the super-hydrophobic asphalt spraying liquid A, placing the super-hydrophobic asphalt spraying liquid A in a spray gun, controlling the spraying pressure and the spraying distance, and uniformly spraying the super-hydrophobic asphalt spraying liquid A for a certain time to obtain a spraying layer B, so as to obtain a composite spraying layer;
step six: and (3) placing the sprayed sample containing the composite spraying layer in an oven for a certain time to obtain a high-stability super-hydrophobic asphalt surface, namely the prepared asphalt adhesion preventing coating layer.
2. The method for preparing the asphalt adhesion preventing coating layer according to claim 1, wherein the silica particles are replaced by nanoparticles of titanium dioxide or aluminum oxide.
3. The method for preparing the asphalt adhesion preventing coating layer as claimed in claim 1, wherein in the step one, the volume ratio of tetraethyl orthosilicate, ethanol and ammonia water is 1:2:1 to 1:50:1, the particle size of the silicon dioxide particles is 10-100 nm, the stirring speed is 200-1000 r/min, and the stirring time is 0.5-24 h.
4. The method of claim 1, wherein in the second step, the perfluorooctyltrichlorosilane is replaced by perfluorodecyltrichlorosilane, perfluorododecyltrichlorosilane, or perfluorodecyltriethoxysilane.
5. The method for preparing the asphalt adhesion preventing coating layer according to claim 1, wherein in the fourth step, the spraying pressure is 0.1 to 1MPa, the spraying distance is 5 to 30cm, and the spraying thickness is controlled to be 10nm to 5mm; in the fifth step, the spraying pressure is 0.1-1 MPa, the spraying distance is 5-30 cm, the spraying thickness is controlled to be 100 nm-15 mm, and the thickness of the spraying layer B is larger than that of the spraying layer A.
6. The method for preparing the asphalt adhesion preventing coating layer according to claim 1, wherein in the formation of the composite spray coating layer in the fourth and fifth steps, the super-hydrophobic asphalt spraying liquid A and the primer spraying liquid B are mixed to obtain a mixed liquid C, and then the mixed liquid C is sprayed on the substrate, and then a layer of the super-hydrophobic asphalt spraying liquid A is sprayed.
7. An asphalt adhesion preventing coating layer prepared by the preparation method as set forth in any one of claims 1 to 6.
8. Use of the anti-asphaltic adhesion coating layer of claim 7 in asphalt handling and shipping equipment.
9. A method of anti-adhesion using the anti-asphaltic coating layer of claim 7 to achieve anti-adhesion of asphalt, latex, bunker fuel oil or other heavy oil.
CN202211056235.3A 2022-08-30 2022-08-30 Method for preventing asphalt adhesion and application Pending CN115232495A (en)

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Application publication date: 20221025