CN115652616A - Light aging resistant protective radiation refrigeration filler particle and coating, and preparation method and application thereof - Google Patents
Light aging resistant protective radiation refrigeration filler particle and coating, and preparation method and application thereof Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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Abstract
The invention relates to the technical field of radiation refrigeration, and provides light aging resistant protective radiation refrigeration filler particles and a coating, and a preparation method and application thereof. According to the invention, the color of the industrial lignin is neutralized by using the inorganic particles with high whiteness, so that discomfort caused by high whiteness and light pollution caused by large-area application are avoided, the mid-infrared emissivity at an atmospheric window is increased, the integral radiation refrigeration effect of the material is improved, and the application of the lignin in the radiation refrigeration field is realized for the first time; the photoaging-resistant protective radiation refrigeration coating disclosed by the invention is simple in preparation process and low in cost, can be used for the surfaces of various materials such as sunshade umbrellas, outdoor clothes and tents, and has great application potential.
Description
Technical Field
The invention relates to the technical field of radiation refrigeration, in particular to light aging resistant protective radiation refrigeration filler particles and a coating, and a preparation method and application thereof.
Background
In recent years, global warming is aggravated due to large energy consumption and emission of greenhouse gases, and long-time high-temperature weather appears in summer, so that the service life of outdoor products is shortened while the physical health of outdoor workers is greatly threatened. Therefore, people have an increasing trend of outdoor demand for anti-ultraviolet cooling materials.
The radiation refrigeration material is used as a cooling mode without power consumption, has the characteristics of zero energy consumption and zero emission, can realize spontaneous radiation refrigeration effect in various outdoor environments, has practical significance for outdoor heat management of buildings, human bodies, photovoltaic equipment and the like, and arouses research interest of numerous scholars. Common radiation refrigeration materials can be classified into 5 types, film-based radiation refrigerators, metamaterials, photonic crystals, coatings, and porous materials. The coating type radiation refrigeration material is expected to become a large-scale radiation refrigeration material with low cost and large-area production.
There are two major drawbacks to current radiation-based refrigeration materials in the form of coatings. One is that the dispersibility of high refractive index, high emissivity particles in the matrix can affect the radiation cooling power, causing the cooling effect to diminish or disappear. And secondly, under the condition of outdoor long-time ultraviolet irradiation, the problems of light aging, color fading and the like can occur, and the service life of the coating and outdoor products is greatly influenced. Thus, research to develop protective radiation-cooling coatings that are resistant to long-term uv exposure remains challenging.
Lignin is used as the second most renewable resource in the world, and a large number of C-OH, C-O, C-O-C and C-H stretching vibration modes exist, so that high broadband emission can occur in a 8-13 mu m wave band, and the high emissivity of the material in a middle infrared wave band can be realized. The lignin structure is rich in groups such as phenolic hydroxyl groups, ketones and the like, so that the lignin becomes a natural UV blocking agent, can shield almost all ultraviolet light, and is widely applied to the fields of light aging resistance and the like. Meanwhile, the lignin has hydrophilic and hydrophobic groups, and has good dispersibility. In conclusion, the lignin can serve as a dispersing agent, radiation refrigeration particles, a UV blocking agent and other functions in the radiation refrigeration coating, and long-term refrigeration of the radiation refrigeration coating is expected to be realized.
However, lignin as a wide-band material cannot perform selective radiation, which affects the radiation refrigeration efficiency, so that the application of lignin in the radiation refrigeration field is limited. Yang Ronggui et al (CN 112111241A) and Zhao Changying et al (CN 113388305A) by adding TiO to the coating 2 ，SiO 2 Inorganic particles such as ZnO, etc., can increase the emissivity of the atmospheric window>90%) and solar reflectance: (>90%), an excellent radiation refrigeration material was prepared. However, the light aging resistance is not good, which is not favorable for long-term outdoor use.
Disclosure of Invention
The present invention aims to solve at least one of the above technical problems, and provides a photoaging-resistant protective radiation refrigeration filler particle and a coating, and a preparation method and an application thereof.
The design idea of the invention is as follows: the lignin is modified by using the high-selectivity radiation inorganic material, so that the reflectivity of the material to sunlight is improved, the light absorption and temperature rise of lignin are reduced, and the efficient radiation refrigeration effect of the lignin-based material is realized. Meanwhile, the excellent oxidation resistance and ultraviolet resistance of the lignin are utilized to remove free radicals generated by inorganic particles in the illumination process, the damage effect of the free radicals on the coating is avoided, the ultraviolet protection performance is endowed to the coating, the light aging resistance of the coating is finally realized, and the application barrier of the lignin material in the radiation refrigeration field is broken through for the first time.
In a first aspect of the invention, there is provided a photoaging resistant protective radiation refrigeration filler particle comprising a white inorganic particle and alkali lignin.
Preferably, the white inorganic particles comprise TiO 2 ，SiO 2 ，ZnO，BaSO 4 ，Al 2 O 3 One or more of MgO, and/or
The white inorganic particles have a particle diameter of 0.5 to 5 μm, and/or
The mass ratio of the white inorganic particles to the alkali lignin is 5-20:1-15.
In a second aspect of the invention, a method for preparing photoaging-resistant protective radiation refrigeration filler particles is provided, which comprises the following steps:
1) Weighing white inorganic particles, dispersing in water to form a dispersion liquid, adding alkali lignin, and adjusting the pH value to a certain value;
2) And stirring for a period of time, removing supernatant, washing the residual solid with water, and drying to obtain the coating filler particles.
Preferably, in step 1): the concentration of the dispersion liquid is 0.1-0.4g/mL; the pH is adjusted to a certain value as follows: adjusting the pH value to 2-13 with HCL and/or NaOH;
in step 2): the stirring time is 10-40min, and the drying is freeze drying.
In a third aspect of the invention, a photoaging resistant radiation-protective refrigeration coating is provided, which is characterized by comprising the photoaging resistant radiation-protective refrigeration filler particles as described in any one of claims 1 to 4, and further comprising an aqueous emulsion, a defoaming agent, a leveling agent and a thickening agent, wherein the aqueous emulsion comprises an aqueous acrylic emulsion, an aqueous polyurethane emulsion or an aqueous polyamide emulsion.
In a fourth aspect of the present invention, a method for preparing a photoaging-resistant protective radiation refrigeration coating is provided, which comprises the following steps:
s1, preparing a water-based emulsion with a certain concentration, adding a defoaming agent, a leveling agent and a thickening agent, and stirring for a period of time;
s2, adding the filler particles, stirring, and then carrying out ultrasonic treatment for a period of time to obtain coating slurry;
and S3, applying the coating slurry to a base material, and drying to obtain the photoaging-resistant protective radiation refrigeration coating.
Preferably, in the step S1, the mass concentration of the aqueous emulsion is 30% to 80%, the mass concentration of the defoaming agent is 0.01% to 0.05%, the mass concentration of the leveling agent is 0.1% to 0.5%, and the mass concentration of the thickening agent is 0.1% to 0.5%; the stirring time is 10-45min.
Preferably, the antifoaming agent in step S1 comprises one or more of 902W, 1488, BYK-024; the leveling agent comprises one or more of Modaflow 2100, BYK-313 and BYK-333; the thickener comprises one or more of R2020, sodium alginate, bermocoll EBM 8000, and/or
Preferably, the solid content of the filler particles in the coating slurry in step S2 is 10-60%; the stirring speed is 300-800rpm, and the time is 10-30min; the ultrasonic power is 60-300W, and the ultrasonic time is 5-30min.
Preferably, the substrate in step S3 is a fabric, and the applying the coating slurry to the substrate specifically includes: padding the fabric according to a certain bath ratio, controlling a certain final rolling allowance rate by controlling pressure, and finally drying to obtain the photoaging-resistant protective radiation refrigeration coating.
Preferably, the fabric comprises white pure cotton fabric, white polyester fabric, white nylon fabric, white polyester-cotton blended fabric, white polypropylene fabric and colored polyester fabric;
the bath ratio is 1:10-40, wherein the padding adopts a padding process of two-dipping and two-rolling;
the final rolling allowance is 30-90%;
the drying is carried out at 40-80 ℃ for 0.5-2h.
The mechanism of the invention is as follows:
the lignin is modified by the white inorganic particles with high solar reflectivity and high intermediate infrared emissivity, so that the color of the lignin is lightened, the emissivity and the solar reflectivity of the lignin in an atmospheric window range are enhanced, and the application of the lignin in the field of radiation refrigeration is realized for the first time. Meanwhile, the coating of the lignin can realize self-dispersion of inorganic particles in the coating, the lignin has excellent oxidation resistance and ultraviolet protection performance, free radicals generated by the inorganic particles due to illumination can be removed, and the ultraviolet protection performance of the coating is improved, so that the high-efficiency light-aging-resistant protective radiation refrigeration coating is prepared.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. according to the invention, the color of the industrial lignin is neutralized by using the inorganic particles with high whiteness, so that discomfort caused by high whiteness and light pollution caused by large-area application are avoided, the mid-infrared emissivity in an atmospheric window is increased, the integral radiation refrigeration effect of the material is improved, and the application of the lignin in the radiation refrigeration field is realized for the first time;
2. the radiation refrigeration filler particle designed by the invention has no complex chemical reaction process, only by adjusting non-covalent bond effects such as hydrogen bond, van der waals force and the like, the lignin is grafted on the surface of the inorganic particle, and the proportion of the lignin and the inorganic particle is accurately controlled, so that the self-dispersion of the lignin in the coating is realized, and the problem of low radiation refrigeration effect caused by agglomeration of the inorganic particle is solved;
3. according to the invention, lignin is used for removing free radicals generated by inorganic particles due to illumination, the UV blocking effect of the material is improved, the antioxidation and uvioresistant effects of the lignin are fully exerted, and the problem of poor light resistance of an outdoor radiation refrigeration coating is solved;
4. the photoaging-resistant protective radiation refrigeration coating disclosed by the invention is simple in preparation process and low in cost, can be used for the surfaces of various materials such as sunshade umbrellas, outdoor clothes and tents, and has great application potential.
Drawings
FIG. 1 is an appearance diagram of a real object before and after xenon lamp irradiation for 24h, its UPF value and a colored fabric delta K/S value of a photoaging-resistant protective radiation refrigeration coated fabric according to a preferred embodiment of the present invention;
FIG. 2 is an infrared spectrum of a radiation refrigeration filler particle of a preferred embodiment of the present invention;
FIG. 3 is a graph of emissivity of a light aging resistant protective radiation refrigeration coating according to a preferred embodiment of the present invention;
FIG. 4 is a photo-aging resistant radiation protective refrigeration coating infrared thermography of a preferred embodiment of the present invention: a) Irradiating for 1h under sunlight; b) After 1h of xenon lamp irradiation (room temperature 25 ℃ C.).
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The percentage contents referred to in the preferred embodiments of the present invention are all mass percentages.
Example 1
10g of TiO are weighed 2 ，SiO 2 ，ZnO，BaSO 4 ，Al 2 O 3 MgO is dispersed in 50mL of aqueous solution, 3g of alkali lignin is added, the pH is adjusted to 5 by HCL and NaOH, after stirring for 30min, the supernatant is removed by centrifugation, the remaining solid is washed 2 times with ultrapure water, and after freeze drying, TL, SL, ZL, BL, AL and ML series of coating filler particles are respectively prepared.
FIG. 2 shows 10g of TiO in this example 2 Infrared spectra of the coating filler particles of the TL produced. And tabletting the prepared particles by a potassium bromide tabletting method, and mixing the sample and potassium bromide according to the weight ratio of 1: after grinding at a ratio of 100, the test sample was obtained after 60 seconds at 15mPa in the mold. The sample was then scanned for infrared spectra. It can be found that the sample exists between 480 and 680cm -1 The range is the peak of stretching vibration of Ti-O. 2920cm -1 The peak at (a) is the C-H stretching vibration peak in the alkali lignin, which indicates the successful preparation of the particles. At the same time, at 3430cm -1 The peak is the stretching vibration peak of the phenolic hydroxyl, which indicates that the antioxidant activity is good. In addition, absorption peaks of benzene ring skeletons appear at 1600cm respectively -1 、1511cm -1 、1125cm -1 、837cm -1 The tensile absorption peak of nearby and C-O appeared at 1124cm -1 、1385cm -1 The particles are proved to have excellent violet resistanceAnd (4) external effect. On the basis, the coating is coated on the atmospheric window (8-13 mu m,1250-769 cm) -1 ) Has stronger absorption vibration peak, which indicates that the material has higher emissivity at the atmospheric window, so the material is supposed to have good radiation refrigeration effect.
Example 2
Weighing 5g,15g and 20g of TiO 2 Dispersing in 50mL water solution, adding 3g alkali lignin, adjusting pH to 5 with HCl and NaOH, stirring for 30min, centrifuging to remove supernatant, washing the rest solid with ultrapure water for 2 times, and freeze drying to obtain the coating filler particle.
Example 3
10g of TiO are weighed 2 Dispersing in 50mL aqueous solution, adding 1g,5g,8g,10g,15g of alkali lignin, HCL and NaOH to adjust the pH value to 5, stirring for 30min, centrifuging to remove supernatant, remaining solid with ultra pure water cleaning 2 times, freeze drying to obtain the coating filler particles.
Example 4
10g of TiO are weighed 2 Dispersing in 50mL of water solution, adding 3g of alkali lignin, adjusting pH to 2,3,4,6,7,8,9, 10, 11, 12, 13 with HCl and NaOH, stirring for 30min, centrifuging to remove supernatant, washing the residual solid with ultrapure water for 2 times, and freeze-drying to obtain the coating filler particles.
Example 5
Preparing 30%,40%,50%,60%,70% and 80% of acrylic emulsion, uniformly stirring, adding 0.02% of defoaming agent, 0.3% of leveling agent and 0.3% of thickening agent, stirring for 30min, adding the coating filler particles prepared in the example 1, stirring for 20min at the speed of 600rpm, and performing ultrasonic treatment for 15min under the ultrasonic power of 170W by using a cell crusher to obtain coating slurry with the solid content of 40% of the coating filler particles for later use. Mixing white polyester fabrics according to the weight ratio of 1: and the bath ratio of 30, a padding process of two-dipping and two-rolling is adopted, the final rolling residual rate is controlled to be 70% by controlling the pressure, and then the coating is dried for 1 hour at the temperature of 60 ℃ to obtain the light-aging-resistant protective radiation refrigeration coating.
FIG. 3 is a plot of the reflectance at atmospheric window measured under 50% acrylic emulsion conditions in example 5, and the coating was readily found to have a high reflectance (90%). On the basis, the sample was irradiated under sunlight and a xenon lamp for 1 hour by an infrared thermal imaging technique, and then photographed into a phase (fig. 4). From a) in fig. 4, the coating can be found to have a refrigeration effect under the irradiation of sunlight, and compared with the original polyester fabric, the temperature is reduced by 0.5 ℃. In fig. 4, under the condition that the part in the circle b) is irradiated by a high-power xenon lamp, the temperature is reduced by 0.9 ℃ compared with the original fabric. Thus, the radiation refrigeration effect is realized.
Example 6
Preparing 50% of acrylic emulsion, uniformly stirring, adding 0.02% of defoaming agent (902W), 0.3% of leveling agent (BYK-313) and 0.3% of thickening agent (R2020), stirring for 30min, adding the coating filler particles prepared in the example 1, stirring for 20min at the speed of 600rpm, and performing ultrasonic treatment for 15min by using a cell crusher under the ultrasonic power of 170W to obtain coating slurry with the solid content of the coating filler particles of 10%,20%,30%,50% and 60% for later use. Mixing white polyester fabrics according to the weight ratio of 1: and the bath ratio of 30, a padding process of two-dipping and two-rolling is adopted, the final rolling residual rate is controlled to be 70% by controlling the pressure, and then the coating is dried for 1 hour at the temperature of 60 ℃ to obtain the light-aging-resistant protective radiation refrigeration coating.
Example 7
Preparing 50% of acrylic emulsion, stirring uniformly, adding 0.02% of defoaming agent (902W), 0.3% of leveling agent (BYK-313) and 0.3% of thickening agent (R2020), stirring for 30min, adding the coating filler particles prepared in the above example 1, stirring at the speed of 600rpm for 20min, and then performing ultrasonic treatment for 15min by using cell crushers 68W,102W,136W,204W,238W,272W,306W and 340W under ultrasonic power to obtain coating slurry with the solid content of 40% of the coating filler particles for later use. Mixing white polyester fabrics according to the weight ratio of 1: and the bath ratio of 30, a padding process of two-dipping and two-rolling is adopted, the final rolling residual rate is controlled to be 70% by controlling the pressure, and then the coating is dried for 1 hour at the temperature of 60 ℃ to obtain the light-aging-resistant protective radiation refrigeration coating.
Example 8
Preparing 50% of acrylic emulsion, stirring uniformly, adding 0.02% of defoaming agent (902W), 0.3% of flatting agent (BYK-313) and 0.3% of thickening agent (R2020), stirring for 30min, adding the coating filler particles prepared in the above example 1, stirring at the speed of 600rpm for 20min, and performing ultrasonic treatment at the ultrasonic power of 170W by using a cell crusher for 5min,10min,2 min,25min and 30min to obtain coating slurry with the solid content of the coating filler particles of 40% for later use. And (3) mixing the white polyester fabric according to the proportion of 1: and the bath ratio of 30, a padding process of two-dipping and two-rolling is adopted, the final rolling residual rate is controlled to be 70% by controlling the pressure, and then the coating is dried for 1 hour at the temperature of 60 ℃ to obtain the light-aging-resistant protective radiation refrigeration coating.
Example 9
Preparing 50% of acrylic emulsion, uniformly stirring, adding 0.02% of defoaming agent (902W), 0.3% of leveling agent (BYK-313) and 0.3% of thickening agent (R2020), stirring for 30min, adding the coating filler particles prepared in the above example 1, stirring at a speed of 600rpm for 20min, and performing ultrasonic treatment for 15min under the ultrasonic power of 170W of a cell crusher to obtain coating slurry with the solid content of 40% of the coating filler particles for later use. White pure cotton fabric, white chinlon fabric, white polyester-cotton blended fabric, white polypropylene fabric and colored polyester fabric are mixed according to the weight ratio of 1: and the bath ratio of 30, a padding process of two-dipping and two-rolling is adopted, the final rolling residual rate is controlled to be 70% by controlling the pressure, and then the coating is dried for 1 hour at the temperature of 60 ℃ to obtain the light-aging-resistant protective radiation refrigeration coating.
Fig. 1 is an object appearance diagram before and after 24 hours of continuous irradiation of the white pure cotton radiation refrigeration coated fabric, the white polyester radiation refrigeration coated fabric and the colored polyester radiation refrigeration coated fabric under high-intensity sunlight, and a UPF value and a Δ K/S value of the colored fabric, which are prepared in the embodiment. From the figure, it can be seen that the white fabric is not whitened, and the color depth (delta K/S) of the colored fabric is changed by only 0.04, which shows that the coating of the invention has excellent light aging resistance and protective performance when applied to the textile.
Example 10
Preparing 50% of acrylic emulsion, uniformly stirring, adding 0.02% of defoaming agent (902W), 0.3% of leveling agent (BYK-313) and 0.3% of thickening agent (R2020), stirring for 30min, adding the coating filler particles prepared in the above example 1, stirring at a speed of 600rpm for 20min, and performing ultrasonic treatment for 15min under the ultrasonic power of 170W of a cell crusher to obtain coating slurry with the solid content of 40% of the coating filler particles for later use. Mixing white polyester fabrics according to the proportion of 1:10,1:20,1: and the bath ratio of 40, the padding process of two-dipping and two-rolling is adopted, the final rolling residual rate is controlled to be 70% by controlling the pressure, and then the coating is dried for 1 hour at the temperature of 60 ℃ to obtain the light-aging-resistant protective radiation refrigeration coating.
Example 11
Preparing 50% of acrylic emulsion, uniformly stirring, adding 0.02% of defoaming agent (902W), 0.3% of leveling agent (BYK-313) and 0.3% of thickening agent (R2020), stirring for 30min, adding the coating filler particles prepared in the above example 1, stirring at a speed of 600rpm for 20min, and performing ultrasonic treatment for 15min under the ultrasonic power of 170W of a cell crusher to obtain coating slurry with the solid content of 40% of the coating filler particles for later use. Mixing white polyester fabrics according to the weight ratio of 1:30 percent of bath ratio, a padding process of two-dipping and two-rolling is adopted, the final rolling residual rate is controlled to be 30 percent and 50 percent by controlling the pressure, and after 90 percent, the coating is dried for 1 hour at 60 ℃ to obtain the light-aging-resistant protective radiation refrigeration coating.
The photoaging-resistant protective radiation refrigeration coating disclosed by the invention is simple in preparation process and low in cost, can be used for the surfaces of various materials such as sunshade umbrellas, outdoor clothes and tents, and has great application potential.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (10)
1. The photoaging-resistant protective radiation refrigeration filler particle is characterized by comprising white inorganic particles and alkali lignin.
2. The photoaging resistant protected radiant refrigeration of claim 1Filler particles, characterized in that the white inorganic particles comprise TiO 2 ，SiO 2 ，ZnO，BaSO 4 ，Al 2 O 3 One or more of MgO, and/or
The white inorganic particles have a particle diameter of 0.5 to 5 μm, and/or
The mass ratio of the white inorganic particles to the alkali lignin is 5-20:1-15.
3. A preparation method of light aging resistant protective radiation refrigeration filler particles is characterized by comprising the following steps:
1) Weighing white inorganic particles, dispersing in water to form a dispersion liquid, adding alkali lignin, and adjusting the pH value to a certain value;
2) And stirring for a period of time, removing supernatant, washing the residual solid with water, and drying to obtain the coating filler particles.
4. The method for preparing the photoaging-resistant protective radiation refrigeration filler particle as claimed in claim 3, wherein in the step 1): the concentration of the dispersion liquid is 0.1-0.4g/mL; the pH is adjusted to a certain value as follows: adjusting the pH value to 2-13 by using HCl and/or NaOH;
in step 2): the stirring time is 10-40min, and the drying is freeze drying.
5. A photoaging-resistant radiation-protective refrigeration coating, comprising the photoaging-resistant radiation-protective refrigeration filler particles of any one of claims 1 to 4, and further comprising an aqueous emulsion, a defoamer, a leveling agent and a thickener, wherein the aqueous emulsion comprises an aqueous acrylic emulsion, an aqueous polyurethane emulsion or an aqueous polyamide emulsion.
6. A preparation method of a photoaging-resistant protective radiation refrigeration coating is characterized by comprising the following steps:
s1, preparing a water-based emulsion with a certain concentration, adding a defoaming agent, a leveling agent and a thickening agent, and stirring for a period of time;
s2, adding the filler particles, stirring, and then carrying out ultrasonic treatment for a period of time to obtain coating slurry;
and S3, applying the coating slurry to a base material, and drying to obtain the photoaging-resistant protective radiation refrigeration coating.
7. The method for preparing the photoaging-resistant protective radiation refrigeration coating according to claim 6, wherein in step S1, the mass concentration of the aqueous emulsion is 30% to 80%, the mass concentration of the antifoaming agent is 0.01% to 0.05%, the mass concentration of the leveling agent is 0.1% to 0.5%, and the mass concentration of the thickening agent is 0.1% to 0.5%; the stirring time is 10-45min.
8. The method for preparing the photoaging-resistant protective radiation refrigerating coating as claimed in claim 6, wherein the solid content of the filler particles in the coating slurry in step S2 is 10-60%; the stirring speed is 300-800rpm, and the time is 10-30min; the ultrasonic power is 60-300W, and the ultrasonic time is 5-30min.
9. The method for preparing the photoaging-resistant protective radiation refrigerating coating layer according to claim 6, wherein the substrate in step S3 is a fabric, and the applying the coating slurry to the substrate specifically comprises: padding the fabric according to a certain bath ratio, controlling a certain final rolling residual rate by controlling pressure, and finally drying to obtain the photoaging-resistant protective radiation refrigeration coating.
10. The method for preparing the photoaging-resistant protective radiation refrigerating coating of claim 9, wherein the fabric comprises white pure cotton fabric, white polyester fabric, white nylon fabric, white polyester-cotton blended fabric, white polypropylene fabric and colored polyester fabric;
the bath ratio is 1:10-40, wherein the padding adopts a padding process of two-dipping and two-rolling;
the final rolling allowance is 30-90%;
the drying is carried out at 40-80 ℃ for 0.5-2h.
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