CN113308151A - Preparation method of weather-resistant 5G antenna housing super-lyophobic self-cleaning coating - Google Patents
Preparation method of weather-resistant 5G antenna housing super-lyophobic self-cleaning coating Download PDFInfo
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Abstract
The invention discloses a preparation method of a weather-resistant 5G radome super-lyophobic self-cleaning coating, which comprises the steps of generating non-solvent induced phase separation by adopting FEVE resin with excellent weather resistance to generate microspheres, coating fluorosilane modified low-dielectric-constant nanoparticles on the surfaces of the FEVE resin microspheres to construct a micro-nano core-shell structure, and controlling the phase separation condition of the FEVE resin, the chemical composition of F-nanoparticles and the mass ratio of the F-nanoparticles/the FEVE resin microspheres to regulate and control the micro-nano structure and the chemical composition of the coating so as to prepare the weather-resistant 5G radome super-lyophobic self-cleaning coating. The coating has excellent properties of super-hydrophobic micro-droplets and low-surface-energy liquid, and simultaneously shows excellent weather resistance, and the coating does not influence the transmission of 5G signals. The invention also has the advantages of simple preparation method, large-area preparation and the like, and is expected to be widely applied to the surface of the 5G antenna housing to effectively solve the rain attenuation effect of the 5G antenna housing.
Description
Technical Field
The invention relates to a preparation method of an ultralyophobic coating, in particular to a preparation method of a weather-resistant 5G radome ultralyophobic self-cleaning coating, and belongs to the technical field of 5G radomes.
Background
At present, China has built the largest-scale 5G network in the world, so a large number of 5G base stations (mainly comprising an antenna system and a radome) are required to support. The 5G antenna housing is an important component of the 5G base station, and is used for reducing the interference of external complex environment factors on a 5G antenna system as much as possible, improving the accuracy and the working reliability of the antenna and prolonging the service life of the antenna. In order to obtain a transmission rate higher than that of 4G, a 5G signal adopts a frequency band below 6GHz at present, and a millimeter wave with the frequency of 30-300 GHz is used in the future, so that the 5G signal is susceptible to external interference, particularly, when raining, rainwater can form a water drop or a water film on the surface of a 5G antenna housing, and a large amount of electromagnetic waves can be absorbed and reflected due to the high dielectric constant of water (about 80 ℃ at 25 ℃), so that the 5G signal is seriously attenuated, namely, the rain attenuation effect. Therefore, how to effectively solve the rain attenuation effect has an extremely important meaning for the 5G technology.
Ultralyophobic coatings (superhydrophobic, superamphiphobic coatings) are a class of coatings that have a particular wettability. Because the water-based oil-water separator has a higher contact angle (150 degrees) and a lower rolling angle (less than 10 degrees) for liquid drops, the liquid drops are easy to roll off from the surface, and the water-based oil-water separator has wide application prospects in the fields of self-cleaning, anti-icing, anti-fouling, oil/water separation, anticorrosion and the like. Therefore, the super-lyophobic coating is very expected to be used on the surface of a 5G antenna housing to solve the 'rain attenuation effect'. However, the practical application of ultralyophobic coatings to 5G radome surfaces is still limited by the following technical bottlenecks: (1) effect of ultralyophobic coating on 5G signal transmission. The 5G signal has high frequency and short wavelength, so that the 5G signal has strong reflection and scattering characteristics, and therefore, the 5G signal is very easy to be lost in the transmission process. Although the ultralyophobic coating can be expected to solve the 'rain attenuation effect' of the 5G antenna housing, the micro-nano structure and the low surface energy substance of the ultralyophobic coating can cause the loss of a 5G signal. (2) Micro-droplets and low surface tension liquids tend to adhere to the surface of the coating. The large volume of water droplets on the ultralyophobic coating tends to be in the Cassie-Baxter state, while the micro-droplets (< 1 μ L) or low surface tension liquid on the surface tends to be in the Wenzel state, so that the coating loses the advantages of the ultralyophobic coating. The currently prepared super-amphiphobic coating shows excellent super-phobicity for large-volume water drops, but liquid drops with the volume less than or equal to 1 mu L or low-surface tension liquid tends to adhere to the surface of the super-amphiphobic coating. However, the rainfall process is very complicated, raindrops with different volumes (0.03-14 μ L) continuously collide with the surface of the coating, and the raindrops often contain a small amount of low-surface-tension substances, so that part of raindrops are adhered to the surface of the coating, and the 'rain attenuation effect' of the 5G radome cannot be effectively solved. (3) The ultralyophobic coating has poor weather resistance. Since the 5G antenna housing is placed outdoors for a long time, the antenna housing is directly attacked by external environmental factors such as rainfall, sand dust, ultraviolet rays and the like, and the ultralyophobic coating is required to have excellent weather resistance, namely, excellent mechanical stability, ultraviolet aging resistance and the like. Although some researches have reported that the ultralyophobic coating has good ultralyophobic performance, mechanical stability and ultraviolet aging resistance, the weather-resistant type of the 5G antenna housing still has the defect of lacking writing. Therefore, the development of an ultralyophobic coating which has excellent ultralyophobic micro-droplets and low surface energy liquid properties, excellent weather resistance and does not affect 5G signal transmission is of great significance to the development of 5G technology.
Disclosure of Invention
The invention aims to provide a preparation method of a weather-resistant 5G antenna housing super-lyophobic self-cleaning coating, which can effectively solve the problem of the application of the conventional super-lyophobic coating on a 5G antenna housing.
Preparation of weather-resistant 5G antenna housing super-lyophobic self-cleaning coating
The preparation method of the weather-resistant 5G antenna housing super-lyophobic self-cleaning coating comprises the following steps:
(1) FEVE resin microsphere dispersion preparation
Fully dissolving the FEVE resin in a polar solvent, then adding a non-polar solvent while stirring, continuously stirring for 5-10 min, and carrying out non-solvent induced phase separation on the FEVE resin to obtain the FEVE resin microsphere suspension.
Wherein the polar solvent is one of ethyl acetate, butyl acetate, acetone and toluene; the non-polar solvent is one of methanol, ethanol, isopropanol and water, and the mass ratio of the polar solvent to the non-polar solvent is 5: 1-1: 1. The mass fraction of the FEVE resin in the mixed solvent is 10-50%.
(2) Preparation of fluorosilane modified low dielectric constant nano particles
Dispersing the low dielectric constant nano particles into an ethanol-water mixed system, taking ethyl orthosilicate as a silane coupling agent, and carrying out hydrolytic condensation reaction on fluorosilane on the surfaces of the low dielectric constant nano particles under the catalytic action of ammonia water; and after the reaction is finished, carrying out suction filtration and drying on the obtained suspension to obtain the fluorosilane modified low-dielectric-constant nano particles.
In the ethanol-water mixed system, the volume ratio of ethanol to water is 4: 1-10: 1.
The low dielectric constant nano particles are one of silicon dioxide, diatomite, attapulgite and sepiolite; the fluorosilane is one of perfluorodecyl trimethoxy silane, perfluorodecyl triethoxy silane, perfluorooctyl trimethoxy silane and perfluorooctyl triethoxy silane.
The mass ratio of the low-dielectric-constant nanoparticles to the fluorosilane is 1: 1-1: 3; the mass ratio of the ethyl orthosilicate to the fluorosilane is 1: 2-1: 6.
The hydrolysis condensation reaction is carried out for 2-4 h at room temperature.
(3) Preparation of weather-resistant 5G antenna housing super-lyophobic self-cleaning coating
Adding the low-dielectric-constant nano particles modified by the fluorosilane into FEVE resin microsphere dispersion liquid, firstly stirring for 15-30 min, then carrying out ultrasonic dispersion for 5-10 min, then spraying the mixture on a substrate, and curing at room temperature for 20-24 h to obtain the weather-resistant 5G radome super-lyophobic self-cleaning coating.
The mass ratio of the fluorosilane modified low-dielectric-constant nano particles to the FEVE resin microsphere dispersion liquid is 0.1: 1-0.5: 1.
The base material is polypropylene, polycarbonate, ABS resin and composite materials thereof.
Carrying out non-solvent induced phase separation on the FEVE resin to generate FEVE microspheres; the silane-modified low-dielectric-constant nanoparticles are coated on the surface of the FEVE resin microspheres to form a micro-nano core-shell structure (figure 1), and the micro-nano structure can effectively capture air and combine with the low surface energy of the micro-nano structure, so that the coating has excellent ultra-hydrophobic micro-droplet performance. In addition, during the preparation process of the coating, the microspheres are connected and stacked to form a self-similar structure, so that the coating has excellent mechanical stability.
Second, weather-proof performance of super-lyophobic self-cleaning coating for 5G antenna housing
1. Super lyophobic property
Fig. 2 (a) a photograph of 1 μ L (left) and 10 μ L (right) of water drops on the coating surface, (b) a photograph of 1 μ L (left) and 10 μ L (right) of n-hexadecane drops on the coating surface, and (c) a photograph of a weather-resistant ultralyophobic self-cleaning 5G radome. As can be seen from fig. 2, the ultralyophobic coating prepared by the invention has excellent ultralyophobic property, the contact angle of a water drop with the volume of 10 μ L is >165 °, and the rolling angle is <2 °; the contact angle of a 1 μ Ι _ drop of water is >160 ° and the rolling angle is <5 °. A contact angle of >158 ° for 10 μ Ι _ n-hexadecane, a roll angle <3 °; the contact angle of 1 μ Ι _ n-hexadecane was >155 ° and the sliding angle was <10 °.
(2) Weather resistance test
The contact angle for water after 300 rubs on 1000 mesh sandpaper (40 cm per rub) under a pressure of 4.3kPa was >155 ° and the sliding angle was <8 °, the contact angle for n-hexadecane was >150 ° and the sliding angle was <10 ° (fig. 3).
The super-lyophobic performance of the coating is not obviously changed after the coating is soaked in 1M hydrochloric acid, 1M sodium hydroxide and 1M sodium chloride solution for 1000 hours.
The super-lyophobic performance of the coating is not obviously changed after 100 cycles of ultraviolet aging (each cycle comprises 4 hours of illumination at 60 ℃ and 4 hours of rain at 50 ℃). After being placed outdoors for 720d, the coating had a running angle for water <10 ° and a running angle for n-hexadecane <30 °.
(3) Wave-transparent performance of coating for 5G signal
And spraying the coating on the surface of the antenna housing made of the PP material to carry out 5G signal wave-transmitting performance test. The thickness of the coating is 15 micrometers, and fig. 4 shows the wave-transmitting performance test condition of the weather-resistant 5G antenna housing super-lyophobic self-cleaning coating for 5G signals. The results show that the coating has no significant effect on 5G signal transmission.
In summary, the present invention has the following advantages over the prior art:
1. FEVE resin with excellent weather resistance is adopted to generate non-solvent induced phase separation to generate microspheres, and fluorinated low-dielectric-constant nanoparticles are coated on the surfaces of the FEVE resin microspheres to form a micro-nano core-shell structure; the micro-nano structure and the chemical composition of the coating are regulated and controlled by controlling the phase separation condition of the FEVE resin, the chemical composition of the fluorinated low-dielectric-constant nanoparticles and the mass ratio of the fluorinated low-dielectric-constant nanoparticles to the FEVE resin microspheres, so that the 5G radome super-lyophobic self-cleaning coating with excellent super-lyophobic micro-droplets, low surface energy liquid performance and excellent weather resistance is successfully prepared;
2. the super-lyophobic coating prepared by the low-dielectric-constant nano particles effectively avoids the influence of the coating on 5G signal transmission, and lays a foundation for solving the 'rain attenuation effect' of the 5G antenna housing;
3. the preparation method is simple, can be used for large-area preparation, can effectively solve the rain attenuation effect of the 5G radome, and is expected to be widely applied to the surface of the 5G communication radome.
Drawings
Fig. 1 is an SEM image of a weather-resistant 5G radome super-lyophobic self-cleaning coating.
Fig. 2 (a) a photograph of 1 μ L (left) and 10 μ L (right) of water drops on the coating surface, (b) a photograph of 1 μ L (left) and 10 μ L (right) of n-hexadecane drops on the coating surface, and (c) a photograph of a weather-resistant ultralyophobic self-cleaning 5G radome.
Fig. 3 shows the variation of CA and SA of 10 μ L water droplets (a) and n-hexadecane (b) with the number of times the coating was rubbed on sandpaper.
Fig. 4 is a weather-proof 5G antenna housing super lyophobic self-cleaning coating, which has wave-transmitting performance for 5G signals.
Detailed Description
The preparation and performance of the weather-resistant 5G radome super-lyophobic self-cleaning coating are further described by the following specific examples.
Example 1
Dissolving 2g of FEVE resin in 8g of butyl acetate, then adding 8g of ethanol under the stirring condition, and continuously stirring for 10min to prepare FEVE resin microspheres;
dispersing 2g of silicon dioxide into a 500mL ethanol-water mixed system (volume ratio is 22: 3), adding 2.5g of perfluorodecyl trimethoxy silane and 0.7g of tetraethoxysilane, reacting for 2h, filtering the obtained suspension, and drying at 60 ℃ for 24h to obtain the fluorosilane modified silicon dioxide nano particles;
adding 1.25G of fluorosilane modified silicon dioxide nano particles into 10G of FEVE resin microsphere dispersion liquid, stirring for 30min, then carrying out ultrasonic dispersion for 10min, then spraying the dispersion liquid on a polypropylene substrate, and curing for 24h at room temperature to obtain a weather-resistant 5G radome super-lyophobic self-cleaning Coating which is named as Coating 1;
the contact angle of the obtained coating to 10 mu L of water drops is 169 degrees, and the rolling angle is 1 degree; the rolling angle of 1 mul water drop is 3.4 degree; the contact angle of 10 mu L of n-hexadecane liquid drops is 160 degrees, and the rolling angle is 2.4 degrees; the roll angle of the 1. mu.L n-hexadecane droplet was 9.4 °. The rolling angle of the coating layer after being rubbed 300 times (40 cm per rubbing) on 1000 mesh sandpaper with a pressure of 4.3kPa was 4.3 ° for 10. mu.L of water droplets, and the rolling angle of 10. mu.L of n-hexadecane was 7.2 ° (FIG. 3); after 1M hydrochloric acid, 1M sodium hydroxide and 1M sodium chloride solution are soaked for 1000 hours, the super-lyophobic performance of the coating is not obviously changed; after 100 cycles of ultraviolet aging (each cycle comprises 4 hours of illumination at 60 ℃ and 4 hours of rain at 50 ℃), the super-lyophobic performance of the coating has no obvious change; after being placed outdoors for 720d, the coating had a roll angle of 9.3 ° for 10 μ L of water and a roll angle of 27.5 ° for 10 μ L of n-hexadecane.
Example 2
Dissolving 2.5g of FEVE resin in 7.5g of ethyl acetate, adding 6g of methanol under the stirring condition, and continuously stirring for 10min to obtain FEVE resin microspheres;
dispersing 2g of attapulgite into a 500mL ethanol-water mixed system (volume ratio is 21: 4), adding 2.3g of perfluorooctyl triethoxysilane and 0.55g of tetraethoxysilane, reacting for 2h, filtering the obtained suspension, and drying at 60 ℃ for 24h to obtain fluorosilane modified attapulgite nanoparticles;
adding 1.5G of fluorosilane modified attapulgite nano particles into 10G of FEVE resin microsphere dispersion liquid, stirring for 30min, then carrying out ultrasonic dispersion for 10min, then spraying the dispersion liquid on an ABS substrate, and curing for 24h at room temperature to obtain a weather-resistant 5G radome super-lyophobic self-cleaning Coating which is named as Coating 2;
the contact angle of the obtained coating to 10 mu L of water drops is 169.5 degrees, and the rolling angle is 1 degree; the rolling angle of 1 mul water drop is 3.1 degree; the contact angle of a 10 mu L n-hexadecane liquid drop is 160.4 degrees, and the rolling angle is 2.2 degrees; the roll angle of the 1. mu.L n-hexadecane droplet was 8.9 °. The rolling angle of the coating layer after being rubbed 300 times (40 cm per rubbing) on 1000 mesh sandpaper with a pressure of 4.3kPa was 4 ° for 10. mu.L of water droplets, and the rolling angle of 10. mu.L of n-hexadecane was 7.1 ° (FIG. 3); after 1M hydrochloric acid, 1M sodium hydroxide and 1M sodium chloride solution are soaked for 1000 hours, the super-lyophobic performance of the coating is not obviously changed; after 100 cycles of ultraviolet aging (each cycle comprises 4 hours of illumination at 60 ℃ and 4 hours of rain at 50 ℃), the super-lyophobic performance of the coating has no obvious change; after being placed outdoors for 720d, the rolling angle of the coating for 10. mu.L of water was 8.7 °, and the rolling angle for 10. mu.L of n-hexadecane was 25.5 °.
Example 3
Dissolving 2.4g of FEVE resin in 7.6g of acetone, adding 5.5g of isopropanol under the stirring condition, and continuously stirring for 10min to obtain FEVE resin microspheres;
dispersing 2.5g of silicon dioxide into 500mL of ethanol-water mixed system (the volume ratio is 22: 3), adding 2.8g of perfluorodecyl trimethoxy silane and 0.6g of tetraethoxysilane, reacting for 2 hours, filtering the obtained suspension, and drying at 60 ℃ for 24 hours to obtain the fluorosilane modified silicon dioxide nanoparticles;
adding 1.8G of fluorosilane modified silicon dioxide nano particles into 10G of FEVE resin microsphere dispersion liquid, stirring for 30min, then carrying out ultrasonic dispersion for 10min, then spraying the dispersion liquid on an ABS substrate, and curing for 24h at room temperature to obtain a weather-resistant 5G radome super-lyophobic self-cleaning Coating which is named as Coating 3;
the contact angle of the obtained coating to 10 mu L of water drops is 168.5 degrees, and the rolling angle is 1 degree; the rolling angle of 1 mul water drop is 3.7 degree; the contact angle of 10 mu L of n-hexadecane liquid drops is 160 degrees, and the rolling angle is 2.9 degrees; the roll angle of the 1. mu.L n-hexadecane droplet was 9.9 °. The rolling angle of the coating layer after being rubbed 300 times (40 cm per rubbing) on 1000 mesh sandpaper with a pressure of 4.3kPa was 4.8 ° for 10. mu.L of water droplets, and the rolling angle of 10. mu.L of n-hexadecane was 8.1 ° (FIG. 3); after 1M hydrochloric acid, 1M sodium hydroxide and 1M sodium chloride solution are soaked for 1000 hours, the super-lyophobic performance of the coating is not obviously changed; after 100 cycles of ultraviolet aging (each cycle comprises 4 hours of illumination at 60 ℃ and 4 hours of rain at 50 ℃), the super-lyophobic performance of the coating has no obvious change; after being placed outdoors for 720d, the coating had a roll off angle of 9.2 ° for 10 μ L of water and a roll off angle of 26.4 ° for 10 μ L of n-hexadecane.
Example 4
Dissolving 2.3g of FEVE resin in 7.7g of toluene, adding 4g of water under the stirring condition, and continuously stirring for 10min to obtain FEVE resin microspheres;
dispersing 2g of attapulgite into a 500mL ethanol-water mixed system (volume ratio is 22: 3), adding 4.2g of perfluorooctyl triethoxysilane and 0.8g of tetraethoxysilane, reacting for 2h, filtering the obtained suspension, and drying at 60 ℃ for 24h to obtain fluorosilane modified attapulgite nanoparticles;
adding 1.5G of fluorosilane modified attapulgite nano particles into 10G of FEVE resin microsphere dispersion liquid, stirring for 30min, then carrying out ultrasonic dispersion for 10min, then spraying the mixture on a polycarbonate substrate, and curing for 24h at room temperature to obtain a weather-resistant 5G radome super-lyophobic self-cleaning Coating which is named as Coating 4;
the contact angle of the obtained coating to 10 mu L of water drops is 166.5 degrees, and the rolling angle is 1.3 degrees; the rolling angle of 1 mul water drop is 4.7 degree; the contact angle of a 10 mu L n-hexadecane liquid drop is 158 degrees, and the rolling angle is 3.6 degrees; the rolling angle of the 1. mu.L n-hexadecane droplets was 10 °. The rolling angle of the coating layer after being rubbed 300 times (40 cm per rubbing) on 1000 mesh sandpaper with a pressure of 4.3kPa was 5.8 ° for 10. mu.L of water droplets, and 9.2 ° for 10. mu.L of n-hexadecane (FIG. 3); after 1M hydrochloric acid, 1M sodium hydroxide and 1M sodium chloride solution are soaked for 1000 hours, the super-lyophobic performance of the coating is not obviously changed; after 100 cycles of ultraviolet aging (each cycle comprises 4 hours of illumination at 60 ℃ and 4 hours of rain at 50 ℃), the super-lyophobic performance of the coating has no obvious change; after being placed outdoors for 720d, the rolling angle of the coating for 10. mu.L of water was 9.8 °, and the rolling angle for 10. mu.L of n-hexadecane was 28.3 °.
Example 5
Dissolving 2g of FEVE resin in 8g of butyl acetate, then adding 8g of ethanol under the stirring condition, and continuously stirring for 10min to prepare FEVE resin microspheres;
dispersing 1.8g of diatomite into 500mL of ethanol-water mixed system (volume ratio is 21: 4), adding 4.3g of perfluorooctyl triethoxysilane and 0.75g of tetraethoxysilane, reacting for 2h, filtering the obtained suspension, and drying at 60 ℃ for 24h to obtain fluorosilane modified diatomite nanoparticles;
adding 1.7G of fluorosilane modified diatomite nanoparticles into 10G of FEVE resin microsphere dispersion liquid, stirring for 30min, then carrying out ultrasonic dispersion for 10min, then spraying the dispersion liquid on an ABS substrate, and curing for 24h at room temperature to obtain a weather-resistant 5G radome super-lyophobic self-cleaning Coating which is named as Coating 5;
the contact angle of the obtained coating to 10 mu L of water drops is 167.6 degrees, and the rolling angle is 1.5 degrees; the rolling angle of 1 mul water drop is 3.9 degree; the contact angle of a 10 mu L n-hexadecane liquid drop is 158.3 degrees, and the rolling angle is 3.5 degrees; the roll angle of the 1. mu.L n-hexadecane droplet was 9.7 °. The rolling angle of the coating layer after being rubbed 300 times (40 cm per rubbing) on 1000 mesh sandpaper with a pressure of 4.3kPa was 5.6 ° for 10. mu.L of water droplets, and 8.3 ° for 10. mu.L of n-hexadecane (FIG. 3); after 1M hydrochloric acid, 1M sodium hydroxide and 1M sodium chloride solution are soaked for 1000 hours, the super-lyophobic performance of the coating is not obviously changed; after 100 cycles of ultraviolet aging (each cycle comprises 4 hours of illumination at 60 ℃ and 4 hours of rain at 50 ℃), the super-lyophobic performance of the coating has no obvious change; after being placed outdoors for 720d, the coating had a roll off angle of 9.6 ° for 10 μ L of water and a roll off angle of 28.7 ° for 10 μ L of n-hexadecane.
Example 6
Dissolving 2g of FEVE resin in 8g of butyl acetate, then adding 8g of ethanol under the stirring condition, and continuously stirring for 10min to prepare FEVE resin microspheres;
dispersing 2.3g of sepiolite into 500mL of ethanol-water mixed system (the volume ratio is 22: 3), adding 4.1g of perfluorooctyl triethoxysilane and 0.7g of tetraethoxysilane, reacting for 2h, filtering the obtained suspension, and drying at 60 ℃ for 24h to obtain the fluorosilane modified sepiolite nano particles;
adding 2G of the fluorosilane modified sepiolite nano particles into 10G of FEVE resin microsphere dispersion liquid, stirring for 30min, then carrying out ultrasonic dispersion for 10min, then spraying the mixture on a polypropylene substrate, and curing for 24h at room temperature to obtain a weather-resistant 5G radome super-lyophobic self-cleaning Coating which is named as Coating 6;
the contact angle of the obtained coating to 10 mu L of water drops is 167.8 degrees, and the rolling angle is 1.7 degrees; the rolling angle of 1 mul water drop is 4.1 degree; the contact angle of a 10 mu L n-hexadecane liquid drop is 157.6 degrees, and the rolling angle is 4.5 degrees; the roll angle of the 1. mu.L n-hexadecane droplet was 9.8 °. The rolling angle of the coating layer after being rubbed 300 times (40 cm per rubbing) on 1000 mesh sandpaper with a pressure of 4.3kPa was 5.2 ° for 10. mu.L of water droplets, and 8.6 ° for 10. mu.L of n-hexadecane (FIG. 3); after 1M hydrochloric acid, 1M sodium hydroxide and 1M sodium chloride solution are soaked for 1000 hours, the super-lyophobic performance of the coating is not obviously changed; after 100 cycles of ultraviolet aging (each cycle comprises 4 hours of illumination at 60 ℃ and 4 hours of rain at 50 ℃), the super-lyophobic performance of the coating has no obvious change; after being placed outdoors for 720d, the coating had a roll off angle of 9.3 ° for 10 μ L of water and a roll off angle of 28.3 ° for 10 μ L of n-hexadecane.
Claims (10)
1. A preparation method of a weather-resistant 5G antenna housing super-lyophobic self-cleaning coating comprises the following steps:
(1) preparing FEVE resin microsphere dispersion liquid: fully dissolving the FEVE resin in a polar solvent, then adding a non-polar solvent while stirring, continuously stirring for 5-10 min, and carrying out non-solvent induced phase separation on the FEVE resin to prepare FEVE resin microsphere suspension;
(2) preparing low dielectric constant nano particles modified by fluorosilane: dispersing the low dielectric constant nano particles into an ethanol-water mixed system, taking ethyl orthosilicate as a silane coupling agent, and carrying out hydrolytic condensation reaction on fluorosilane on the surfaces of the low dielectric constant nano particles under the catalytic action of ammonia water; after the reaction is finished, carrying out suction filtration and drying on the obtained suspension to obtain fluorosilane modified low-dielectric-constant nano particles;
(3) preparation of the weather-resistant 5G antenna housing super-lyophobic self-cleaning coating: adding the low-dielectric-constant nano particles modified by the fluorosilane into FEVE resin microsphere dispersion liquid, firstly stirring for 15-30 min, then carrying out ultrasonic dispersion for 5-10 min, then spraying the mixture on a substrate, and curing at room temperature for 20-24 h to obtain the weather-resistant 5G radome super-lyophobic self-cleaning coating.
2. The preparation method of the weather-resistant 5G radome super-lyophobic self-cleaning coating according to claim 1, which is characterized by comprising the following steps: in the step (1), the polar solvent is one of ethyl acetate, butyl acetate, acetone and toluene; the non-polar solvent is one of methanol, ethanol, isopropanol and water, and the mass ratio of the polar solvent to the non-polar solvent is 5: 1-1: 1.
3. The preparation method of the weather-resistant 5G radome super-lyophobic self-cleaning coating according to claim 1, which is characterized by comprising the following steps: in the step (1), the mass fraction of the FEVE resin in the mixed solvent is 10-50%.
4. The preparation method of the weather-resistant 5G radome super-lyophobic self-cleaning coating according to claim 1, which is characterized by comprising the following steps: in the step (2), the volume ratio of the ethanol to the water in the ethanol-water mixed system is 4: 1-10: 1.
5. The preparation method of the weather-resistant 5G radome super-lyophobic self-cleaning coating according to claim 1, which is characterized by comprising the following steps: in the step (2), the low-dielectric-constant nano particles are one of silicon dioxide, diatomite, attapulgite and sepiolite.
6. The preparation method of the weather-resistant 5G radome super-lyophobic self-cleaning coating according to claim 1, which is characterized by comprising the following steps: the fluorosilane is one of perfluorodecyl trimethoxy silane, perfluorodecyl triethoxy silane, perfluorooctyl trimethoxy silane and perfluorooctyl triethoxy silane.
7. The preparation method of the weather-resistant 5G radome super-lyophobic self-cleaning coating according to claim 1, which is characterized by comprising the following steps: the mass ratio of the low-dielectric-constant nanoparticles to the fluorosilane is 1: 1-1: 3; the mass ratio of the ethyl orthosilicate to the fluorosilane is 1: 2-1: 6.
8. The preparation method of the weather-resistant 5G radome super-lyophobic self-cleaning coating according to claim 1, which is characterized by comprising the following steps: in the step (2), the hydrolysis condensation reaction is carried out at room temperature for 2-4 h.
9. The preparation method of the weather-resistant 5G radome super-lyophobic self-cleaning coating according to claim 1, which is characterized by comprising the following steps: in the step (3), the mass ratio of the fluorosilane modified low-dielectric-constant nano particles to the FEVE resin microsphere dispersion liquid is 0.1: 1-0.5: 1.
10. The preparation method of the weather-resistant 5G radome super-lyophobic self-cleaning coating according to claim 1, which is characterized by comprising the following steps: in the step (3), the base material is polypropylene, polycarbonate, ABS resin and composite materials thereof.
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