Nano titanium dioxide modified polyacrylate anti-ultraviolet coating and preparation method thereof
By modifying the surface of nano-TiO2 and copolymerizing it, the problem of poor dispersion of nano-TiO2 in polyacrylate matrix was solved, forming a composite coating with excellent dispersibility and UV resistance, which is suitable for architectural exterior coatings and functional textile coatings.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HUANENG YARLUNG TSANGPO RIVER HYDROPOWER DEV INVESTMENT CO LTD
- Filing Date
- 2026-01-29
- Publication Date
- 2026-05-12
AI Technical Summary
In existing technologies, nano-TiO2 has high surface energy, is prone to agglomeration, and has poor compatibility with polyacrylate matrix, which leads to a decline in the performance of composite coatings. Furthermore, the amount of coupling agent is difficult to control precisely, affecting the stability and UV resistance of the coating.
The surface of anatase nano-TiO2 was modified by using silane coupling agent KH-570 to form Ti-O-Si bonds that are stably bonded to the polyacrylate matrix. The nano-TiO2 was dispersed in the organic phase by constructing a micellar microenvironment through an emulsifier. A copolymerization reaction was carried out using an initiator to form an anti-UV coating.
It significantly improves the dispersibility and anti-agglomeration ability of nanoparticles in the organic phase, enhances the interfacial compatibility and stability of the coating, retains the ultraviolet absorption characteristics of nano-TiO2, and forms a composite coating with both film-forming and anti-ultraviolet properties.
Smart Images
Figure CN122011874A_ABST
Abstract
Description
Technical Field
[0001] This disclosure belongs to the field of functional coating materials technology, specifically relating to a nano-titanium dioxide modified polyacrylate UV-resistant coating and its preparation method. Background Technology
[0002] With the increasing depletion of the ozone layer, excessive ultraviolet radiation poses a serious threat to human health and material performance. Developing functional coatings with excellent UV protection properties has become a current research hotspot. Nano-TiO2, due to its good UV absorption properties, low cost, and biocompatibility, is widely used in the field of UV-resistant materials. However, nano-TiO2 has a high surface energy, is prone to aggregation, and has poor compatibility with organic matrices (such as polyacrylates), leading to a decline in the performance of composite coatings. Polyacrylate emulsions have advantages such as being environmentally friendly and having good film-forming properties, but the UV protection performance of pure polyacrylates is limited, requiring composites with inorganic nanomaterials to improve performance.
[0003] In existing technologies, coupling agents are commonly used to modify the surface of nano-TiO2 to improve its dispersibility and compatibility. However, the amount of coupling agent is difficult to control precisely, leading to unstable modification effects. Furthermore, the preparation method of the composite emulsion significantly affects the coating stability; traditional emulsion polymerization methods are prone to problems such as excessively high gelation rates and poor storage stability. Therefore, developing a preparation method that can precisely control modification conditions and improve the stability and UV resistance of composite coatings is of great significance. Summary of the Invention
[0004] This disclosure aims to at least solve one of the technical problems existing in the prior art, and to provide a nano-titanium dioxide modified polyacrylate anti-ultraviolet coating and its preparation method.
[0005] One aspect of this disclosure provides a method for preparing a nano-titanium dioxide modified polyacrylate UV-resistant coating, the preparation method comprising: S110. Add anatase nano-TiO2 to a mixture of anhydrous ethanol and deionized water, disperse it by ultrasonication, add KH570, stir to react, wash, centrifuge and dry to form K-TiO2 powder. S120. Dissolve the emulsifier and NaHCO3 in deionized water, stir, and then add methyl methacrylate, butyl acrylate, acrylic acid mixed monomers and the oil phase mixture formed by the K-TiO2 powder. After ultrasonic treatment and heating and stirring, add the initiator to react and obtain the composite coating emulsion. S130. The composite coating emulsion is cured and molded to form an anti-ultraviolet coating.
[0006] Optionally, the amount of KH570 added is 2-10% of the mass of nano-TiO2.
[0007] Optionally, in step S110, the volume ratio of the content of anatase nano-TiO2 to anhydrous ethanol and deionized water is 5g:50-60mL:90-96mL. Anatase nano-TiO2 was added to a mixture of anhydrous ethanol and deionized water and ultrasonically dispersed for 25-35 minutes at 55-65℃ and 1000 rpm. Anatase-type nano-TiO2 solution was added to KH570 and reacted at 55-65℃ and 1000rpm for 1.5-2.5h, followed by drying at 55-65℃ for 10-15h.
[0008] Optionally, the content of K-TiO2 powder added is 3-11% of the content of the mixed monomers.
[0009] Optionally, the emulsifier includes nonylphenol polyoxyethylene ether and sodium dodecyl sulfate.
[0010] Optionally, the ratio of nonylphenol polyoxyethylene ether to sodium dodecyl sulfate is 1:1.6.
[0011] Optionally, in step S120, the content ratio of the emulsifier to the NaHCO3 is 1.2:0.01; The amount of emulsifier added is 3-4% of the content of the mixed monomers.
[0012] Optionally, the content ratio of methyl methacrylate, butyl acrylate, and acrylic acid is 5:5:0.1.
[0013] Optionally, the initiator is KPS, and the amount of the initiator added is 1-2% of the content of the mixed monomers.
[0014] In another aspect of this disclosure, a nano-titanium dioxide modified polyacrylate UV-resistant coating is provided, wherein the nano-titanium dioxide modified polyacrylate UV-resistant coating is prepared by the preparation method described above.
[0015] This disclosure presents a nano-titanium dioxide modified polyacrylate UV-resistant coating and its preparation method. The preparation method includes: S110, adding anatase nano-TiO2 to a mixture of anhydrous ethanol and deionized water, dispersing it ultrasonically, adding KH570, stirring, washing, centrifuging, and drying to form K-TiO2 powder; S120, dissolving an emulsifier and NaHCO3 in deionized water, stirring, adding a mixture of methyl methacrylate, butyl acrylate, acrylic acid monomers, and the K-TiO2 powder to form an oil phase mixture, ultrasonicating and heating with stirring, adding an initiator to react and obtain a composite coating emulsion; S130, curing the composite coating emulsion to form a UV-resistant coating. This invention uses KH-570 modification to change the surface of TiO2 from hydrophilic to oleophilic, forming a stable chemical bond with the polyacrylate matrix through Ti-O-Si bonds, significantly improving interfacial compatibility. In addition, the resulting coating retains the ultraviolet absorption characteristics of nano-TiO2, and also has the film-forming properties of organic substrates and the UV resistance properties of inorganic nanomaterials, making it suitable for a wide range of applications. Attached Figure Description
[0016] Figure 1 This is a flowchart illustrating the preparation method of the nano-titanium dioxide modified polyacrylate UV-resistant coating according to a specific embodiment of this disclosure. Figure 2 The infrared spectrum of the composite coating obtained in Example 3 of this disclosure; Figure 3 The particle size distribution diagrams are for the composite emulsions prepared in Examples 1-5 of this disclosure. Figure 4 The gelation rate is the gel ratio of the composite emulsions prepared in Examples 1-5 of this disclosure. Detailed Implementation
[0017] To enable those skilled in the art to better understand the technical solutions of this disclosure, the disclosure will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain this disclosure and represent a part of the embodiments of this disclosure, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the protection scope of this disclosure.
[0018] As shown in Figure 1, one aspect of this disclosure provides a method S100 for preparing a nano-titanium dioxide modified polyacrylate UV-resistant coating, specifically including the following steps S110~S130: S110. Anatase nano-TiO2 was added to a mixture of anhydrous ethanol and deionized water and ultrasonically dispersed. The mixture was then transferred to a three-necked flask and stirred at a constant temperature to complete the pretreatment. After the pretreatment, silane coupling agent KH570 dissolved in anhydrous ethanol was added dropwise to the three-necked flask, and the reaction was continued to be stirred to complete the surface modification. Finally, the obtained reaction product was washed with anhydrous ethanol and centrifuged. This process was repeated 3 times and then dried to obtain K-TiO2 powder.
[0019] In step S110, the volume ratio of anatase nano-TiO2 to anhydrous ethanol and deionized water is 5g:(50-60)mL:(90-96)mL, wherein the volume ratio of anhydrous ethanol to deionized water in the mixture is preferably 3:5.
[0020] In step S110, anatase nano-TiO2 is added to a mixture of anhydrous ethanol and deionized water and ultrasonically dispersed for 25-35 min at 55-65℃ and 1000 rpm.
[0021] In step S110, the amount of KH-570 added is 2-10% of the mass of nano-TiO2, for example, 2%, 4%, 6%, 8%, 10%, etc.
[0022] In step S110, after adding KH570 to the anatase nano TiO2 solution, the reaction is carried out at 55-65℃ and 1000rpm for 1.5-2.5h, and then dried at 55-65℃ for 10-15h.
[0023] In this embodiment, the coupling agent is first dissolved in ethanol and then added to the nano-TiO2 dispersion and stirred to ensure that the coupling agent can be uniformly dispersed on the surface of nano-TiO2, thereby increasing the modification effect, improving dispersibility and compatibility, and changing the TiO2 surface from hydrophilic to oleophilic. It forms a stable chemical bond with the polyacrylate matrix through Ti-O-Si bonds, significantly improving interfacial compatibility. The above method can precisely control the amount of KH-570 added, effectively reducing the agglomeration effect of nano-TiO2. After modification, the TiO2 particle size is significantly reduced and the dispersibility is improved.
[0024] S120. Dissolve the emulsifier and NaHCO3 in deionized water, stir vigorously for 8-12 minutes, and then slowly add an oil phase mixture composed of a mixture of methyl methacrylate (MMA), butyl acrylate (BA), and acrylic acid (AA) monomers and a certain amount of modified TiO2. After the addition is complete and the mixture is homogeneous, sonicate for 8-12 minutes. Then transfer the mixture to a three-necked flask equipped with a reflux device, heat and stir. When the temperature rises to 75°C, add the initiator and continue to keep the reaction at this temperature for 2-4 hours. After the reaction is complete, cool to room temperature to obtain the composite coating emulsion.
[0025] In step S120, the emulsifier is a compound system of nonylphenol polyoxyethylene ether (OP-10) and sodium dodecyl sulfate (SDS). OP-10, as a nonionic emulsifier, stabilizes the emulsion micelles and reduces interfacial tension, while SDS, as an anionic emulsifier, prevents particle aggregation through electrostatic repulsion and works synergistically with OP-10 to improve emulsification efficiency.
[0026] As a further preferred option, the content ratio of nonylphenol polyoxyethylene ether to sodium dodecyl sulfate is 1:1.6.
[0027] In step S120, the ratio of emulsifier to NaHCO3 is 1.2:0.01, that is, the emulsifier and NaHCO3 in the above ratio are dissolved together in 80-120g of deionized water.
[0028] In step S120, the amount of K-TiO2 powder added is 3-11% of the mixed monomer content, the amount of emulsifier added is 3-4% of the mixed monomer content, and the amount of initiator added is 1-2% of the mixed monomer content.
[0029] In step S120, the content ratio of methyl methacrylate, butyl acrylate and acrylic acid in the mixed monomers is 5:5:0.1.
[0030] In step S120, the initiator is K2S2O8.
[0031] In this embodiment, the organic segments of KH-570 (such as methacryloyloxy) copolymerize with polyacrylate monomers (MMA / BA / AA) to form polymer chains containing Si-OC structures, which enhances the crosslinking density of the material and reduces phase separation. The modified nano-TiO2 retains its ultraviolet absorption characteristics and, after combining with the polyacrylate matrix, gives the coating long-lasting UV resistance, making it suitable for long-term weather resistance requirements.
[0032] S130, the composite coating emulsion is cured and molded to form an anti-UV coating.
[0033] In step S130, the composite coating emulsion can be directly applied or further dried and cured to form a shape. The curing temperature of the coating emulsion is room temperature, and the curing time is 20-25 hours.
[0034] This disclosure utilizes the silane coupling agent KH-570 to surface modify anatase-type nano-titanium dioxide (TiO2), significantly improving the dispersibility and anti-agglomeration ability of nanoparticles in an organic phase. Subsequently, the modified TiO2 is dispersed in a mixture of methyl methacrylate, butyl acrylate, and acrylic acid monomers. A micellar microenvironment is constructed using a compound emulsifier (OP-10 / SDS), and in-situ emulsion copolymerization of the acrylate monomers and modified TiO2 is achieved under the action of an initiator. This method solves the technical challenge of poor dispersibility of nano-TiO2 in organic matrices. The resulting composite coating exhibits both excellent colloidal stability and long-lasting UV resistance, making it suitable for applications requiring long-term weather resistance, such as architectural exterior coatings and functional textile coatings.
[0035] In another aspect of this disclosure, a nano-titanium dioxide modified polyacrylate UV-resistant coating is proposed. This nano-titanium dioxide modified polyacrylate UV-resistant coating is prepared by the preparation method described above. For the specific process, please refer to the above description, which will not be repeated here.
[0036] The composite coating of this embodiment combines the film-forming properties of organic substrates and the UV resistance of inorganic nanomaterials, making it widely applicable.
[0037] The following specific examples will further illustrate the nano-titanium dioxide modified polyacrylate UV-resistant coating and its preparation method: Example 1 The examples provide a nano-titanium dioxide modified polyacrylate UV-resistant coating and its preparation method. The specific steps are as follows: Step 1: Preparation of KH-570 modified nano-TiO2 (K-TiO2) (1) Take 5.0 g TiO2, 56 mL anhydrous ethanol and 94 mL deionized water into a 250 mL three-necked flask and disperse by ultrasonication for 30 min; (2) At a temperature of 60℃ and 1000 rpm, after stirring for 30 min, add 0.2 g KH-570 (dissolved in anhydrous ethanol) dropwise using a dropper. (3) Continue the reaction at 60℃ and 1000 rpm for 2 h; (4) Wash the prepared solution with anhydrous ethanol and centrifuge, repeating three times; (5) Place the product in an oven and dry for 12 h to obtain K-TiO2.
[0038] Furthermore, step two above includes the following steps: (1) Weigh 1.2 g of emulsifier (OP-10, SDS) and 0.01 g of NaHCO3 and dissolve them in 100 g of deionized water; (2) After stirring vigorously for 10 min, slowly add an oil phase consisting of 15 g MMA, 15 g BA, 0.3 g AA and 0.64 g modified nano TiO2; (3) After mixing evenly, sonicate in a water bath for 10 min; (4) Transfer to a three-necked flask equipped with a reflux reflux device, stir and heat; (5) When the temperature rises to 75℃, add 0.6 g K2S2O8; (6) After the reaction is kept at a constant temperature for 3 hours, the mixture is cooled to room temperature to obtain the composite emulsion.
[0039] Example 2 This embodiment provides a nano-titanium dioxide modified polyacrylate UV-resistant coating and its preparation method. The specific steps are as follows: Step 1: Preparation of KH-570 modified nano-TiO2 (K-TiO2) (1) Take 5.0 g TiO2, 56 mL anhydrous ethanol and 94 mL deionized water into a 250 mL three-necked flask and disperse by ultrasonication for 30 min; (2) At a temperature of 60℃ and 1000 rpm, after stirring for 30 min, add 0.2 g KH-570 (dissolved in anhydrous ethanol) dropwise using a dropper. (3) Continue the reaction at 60℃ and 1000 rpm for 2 h; (4) Wash the prepared solution with anhydrous ethanol and centrifuge, repeating three times; (5) Place the product in an oven and dry for 12 h to obtain K-TiO2.
[0040] Furthermore, step two above includes the following steps: (1) Weigh 1.2 g of emulsifier (OP-10, SDS) and 0.01 g of NaHCO3 and dissolve them in 100 g of deionized water; (2) After stirring vigorously for 10 min, slowly add an oil phase consisting of 15 g MMA, 15 g BA, 0.3 g AA and 1.28 g modified nano TiO2; (3) After mixing evenly, sonicate in a water bath for 10 min; (4) Transfer to a three-necked flask equipped with a reflux reflux device, stir and heat; (5) When the temperature rises to 75℃, add 0.6 g of K2S2O8; (6) After the reaction is kept at a constant temperature for 3 hours, the mixture is cooled to room temperature to obtain the composite emulsion.
[0041] Example 3 This embodiment provides a nano-titanium dioxide modified polyacrylate UV-resistant coating and its preparation method. The specific steps are as follows: Step 1: Preparation of KH-570 modified nano-TiO2 (K-TiO2) (1) Take 5.0 g TiO2, 56 mL anhydrous ethanol and 94 mL deionized water into a 250 mL three-necked flask and disperse by ultrasonication for 30 min; (2) At a temperature of 60℃ and 1000 rpm, after stirring for 30 min, add 0.2 g KH-570 (dissolved in anhydrous ethanol) dropwise using a dropper. (3) Continue the reaction at 60℃ and 1000 rpm for 2 h; (4) Wash the prepared solution with anhydrous ethanol and centrifuge, repeating three times; (5) Place the product in an oven and dry for 12 h to obtain K-TiO2.
[0042] Furthermore, step two above includes the following steps: (1) Weigh 1.2 g of emulsifier (OP-10, SDS) and 0.01 g of NaHCO3 and dissolve them in 100 g of deionized water; (2) After stirring vigorously for 10 min, slowly add an oil phase consisting of 15 g MMA, 15 g BA, 0.3 g AA and 1.93 g modified nano TiO2; (3) After mixing evenly, sonicate in a water bath for 10 min; (4) Transfer to a three-necked flask equipped with a reflux reflux device, stir and heat; (5) When the temperature rises to 75℃, add 0.6 g of K2S2O8; (6) After the reaction is kept at a constant temperature for 3 hours, the mixture is cooled to room temperature to obtain the composite emulsion.
[0043] Figure 2 The infrared spectrum of the composite coating obtained in Example 3 is shown at 1165 cm⁻¹. -1 and 1750 cm -1 The characteristic peaks at these locations are attributed to the stretching vibrations of the CO bond and the vibrations of the C=O bond, respectively. (2880-2961 cm⁻¹) -1 The bimodal range corresponds to the symmetric and asymmetric stretching vibrations of the -CH3 and -CH2 groups. (500-800 cm⁻¹) -1 The broad absorption band indicates the characteristic vibrations of the Ti-O bond, 900-1000 cm⁻¹ -1 The characteristic peaks further confirmed the formation of Ti-O-Si bonds. These characteristic peaks confirm that KH-570-modified TiO2 nanoparticles were successfully grafted into the acrylate polymer matrix through chemical bonding.
[0044] Example 4 This embodiment provides a nano-titanium dioxide modified polyacrylate UV-resistant coating and its preparation method. The specific steps are as follows: Step 1: Preparation of KH-570 modified nano-TiO2 (K-TiO2) (1) Take 5.0 g TiO2, 56 mL anhydrous ethanol and 94 mL deionized water into a 250 mL three-necked flask and disperse by ultrasonication for 30 min; (2) At a temperature of 60℃ and 1000 rpm, after stirring for 30 min, add 0.2 g KH-570 (dissolved in anhydrous ethanol) dropwise using a dropper. (3) Continue the reaction at 60℃ and 1000 rpm for 2 h; (4) Wash the prepared solution with anhydrous ethanol and centrifuge, repeating three times; (5) Place the product in an oven and dry for 12 h to obtain K-TiO2.
[0045] Furthermore, step two above includes the following steps: (1) Weigh 1.2 g of emulsifier (OP-10, SDS) and 0.01 g of NaHCO3 and dissolve them in 100 g of deionized water; (2) After stirring vigorously for 10 min, slowly add the oil phase consisting of 15 g MMA, 15 g BA, 0.3 g AA and 2.57 g modified nano TiO2; (3) After mixing evenly, sonicate in a water bath for 10 min; (4) Transfer to a three-necked flask equipped with a reflux reflux device, stir and heat; (5) When the temperature rises to 75℃, add 0.6 g of K2S2O8; (6) After the reaction is kept at a constant temperature for 3 hours, the mixture is cooled to room temperature to obtain the composite emulsion.
[0046] Example 5 This embodiment provides a nano-titanium dioxide modified polyacrylate UV-resistant coating and its preparation method. The specific steps are as follows: Step 1: Preparation of KH-570 modified nano-TiO2 (K-TiO2) (1) Take 5.0 g TiO2, 56 mL anhydrous ethanol and 94 mL deionized water into a 250 mL three-necked flask and disperse by ultrasonication for 30 min; (2) Under the conditions of 60℃ and 1000 rpm, after stirring for 30 min, add 0.2 g KH-570 (dissolved in anhydrous ethanol) dropwise using a dropper; (3) Continue the reaction at 60℃ and 1000 rpm for 2 h; (4) Wash the prepared solution with anhydrous ethanol and centrifuge, repeating three times; (5) Place the product in an oven and dry for 12 h to obtain K-TiO2.
[0047] Furthermore, step two above includes the following steps: (1) Weigh 1.2 g of emulsifier (OP-10, SDS) and 0.01 g of NaHCO3 and dissolve them in 100 g of deionized water; (2) After stirring vigorously for 10 min, slowly add an oil phase consisting of 15 g MMA, 15 g BA, 0.3 g AA and 3.21 g modified nano TiO2; (3) After mixing evenly, sonicate in a water bath for 10 min; (4) Transfer to a three-necked flask equipped with a reflux reflux device, stir and heat; (5) When the temperature rises to 75℃, add 0.6 g of K2S2O8; (6) After the reaction is kept at a constant temperature for 3 hours, the mixture is cooled to room temperature to obtain the composite emulsion.
[0048] Figure 3 The figures show the particle size distribution of the composite emulsions prepared in Examples 1-5 of this invention. In Examples 1-5, the amount of K-TiO2 added increased from 2% to 10%, and the average particle size of the latex particles remained within the range of 65±5 nm, showing no significant difference. This phenomenon can be explained in two ways: when the amount of K-TiO2 reaches 4% (average particle size 67.4 nm), the TiO2 surface is basically saturated, and further increasing the amount has limited effect on improving surface coverage, thus having little impact on particle size; excessive K-TiO2 will undergo self-aggregation in the solution, hindering the interfacial bonding between nanoparticles and polyacrylate, thereby reducing dispersion stability.
[0049] Figure 4 The gel rate of the composite emulsions prepared in Examples 1-5 of this invention is shown. The gel rate of the composite coating ranges from 5.3% to 9.0%, and is generally less than 10%. Among them, Example 2 has the best effect, with the composite coating gel rate reaching the lowest value of 5.3%, at which point the system has the best stability (no phase separation after 30 days of storage).
[0050] This disclosure presents a nano-titanium dioxide modified polyacrylate UV-resistant coating and its preparation method, which has the following advantages compared to the prior art: 1. This invention effectively reduces the agglomeration effect of nano-TiO2 by precisely controlling the amount of KH-570 added. After modification, the TiO2 particle size is significantly reduced and the dispersion is uniform.
[0051] 2. In this invention, KH-570 is used to modify the TiO2 surface from hydrophilic to oleophilic, and a stable chemical bond is formed with the polyacrylate matrix through Ti-O-Si bonds, which significantly improves the interfacial compatibility.
[0052] 3. This invention retains the ultraviolet absorption characteristics of nano-TiO2, so that the composite coating has both the film-forming properties of organic substrates and the UV resistance properties of inorganic nanomaterials, and has a wide range of applications.
[0053] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of this disclosure, and this disclosure is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of this disclosure, and these modifications and improvements are also considered to be within the scope of protection of this disclosure.
Claims
1. A method for preparing a nano-titanium dioxide modified polyacrylate UV-resistant coating, characterized in that, The preparation method includes: S110. Add anatase nano-TiO2 to a mixture of anhydrous ethanol and deionized water, disperse it by ultrasonication, add KH570, stir to react, wash, centrifuge and dry to form K-TiO2 powder. S120. Dissolve the emulsifier and NaHCO3 in deionized water, stir, and then add methyl methacrylate, butyl acrylate, acrylic acid mixed monomers and the oil phase mixture formed by the K-TiO2 powder. After ultrasonic treatment and heating and stirring, add the initiator to react and obtain the composite coating emulsion. S130. The composite coating emulsion is cured and molded to form an anti-ultraviolet coating.
2. The preparation method according to claim 1, characterized in that, The amount of KH570 added is 2-10% of the mass of nano-TiO2.
3. The preparation method according to claim 1, characterized in that, In step S110, the volume ratio of anatase nano-TiO2 to anhydrous ethanol and deionized water is 5g:(50-60)mL:(90-96)mL. Anatase nano-TiO2 was added to a mixture of anhydrous ethanol and deionized water and ultrasonically dispersed for 25-35 minutes at 55-65℃ and 1000 rpm. Anatase nano-TiO2 solution was added to KH570 and reacted at 55-65℃ and 1000rpm for 1.5-2.5h, followed by drying at 55-65℃ for 10-15h.
4. The preparation method according to claim 1, characterized in that, The content of K-TiO2 powder added is 3-11% of the content of the mixed monomers.
5. The preparation method according to claim 1, characterized in that, The emulsifiers include nonylphenol polyoxyethylene ether and sodium dodecyl sulfate.
6. The preparation method according to claim 5, characterized in that, The ratio of nonylphenol polyoxyethylene ether to sodium dodecyl sulfate is 1:1.
6.
7. The preparation method according to claim 1, characterized in that, In step S120, the content ratio of the emulsifier to the NaHCO3 is 1.2:0.01; The amount of emulsifier added is 3-4% of the content of the mixed monomers.
8. The preparation method according to claim 1, characterized in that, The content ratio of methyl methacrylate, butyl acrylate, and acrylic acid is 5:5:0.
1.
9. The preparation method according to claim 1, characterized in that, The initiator is K2S2O8, and the amount of the initiator added is 1-2% of the content of the mixed monomers.
10. A nano-titanium dioxide modified polyacrylate UV-resistant coating, characterized in that, The nano-titanium dioxide modified polyacrylate UV-resistant coating is prepared by the preparation method described in any one of claims 1 to 9.