A method for producing an ultraviolet absorber UV-1
By using FeCl4/MSNs catalysts and controlling the reaction under specific conditions, the problems of high raw material cost, violent reaction, and equipment corrosion in the preparation of ultraviolet absorber UV-1 were solved, achieving easier control and higher raw material utilization, and extending equipment life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHANGZHOU YONGHE FINE CHEM
- Filing Date
- 2026-02-02
- Publication Date
- 2026-05-29
AI Technical Summary
Existing methods for preparing UV-1 ultraviolet absorber suffer from problems such as high raw material costs, violent and difficult-to-control reactions, and severe equipment corrosion.
FeCl4/MSNs catalysts were used to replace phosphorus oxychloride or thionyl chloride. The reaction temperature was controlled at 0-5℃ and the pressure at 30-40MPa. Formic acid was used to replace trimethyl orthoformate. Mesoporous silica was introduced for functionalization during the preparation process to form FeCl4/MSNs catalysts, which promoted the reaction of ethyl p-aminobenzoate, formic acid and N-methylaniline.
It reduces the corrosion of equipment in the preparation of UV-1 ultraviolet absorber, extends equipment lifespan, makes the reaction easier to control, improves raw material utilization, and reduces production costs.
Abstract
Description
Technical Field
[0001] This application relates to the technical field of chemical raw material synthesis, and in particular to a method for preparing an ultraviolet absorber UV-1. Background Technology
[0002] The research and development of ultraviolet (UV) absorbers is of great significance in the field of chemical raw material synthesis. UV absorbers can absorb specific wavelengths of ultraviolet light and have wide applications in many fields, including adhesives, potting compounds, epoxy resins, and polyurethane materials, such as foamed sponges, elastomers, leather, footwear materials, and coatings. They play a crucial role in improving the UV resistance and extending the service life of these materials. With the continuous development of related industries, the demand for UV absorbers is increasing, and their quality and performance are receiving more attention.
[0003] Currently, in the preparation of the ultraviolet absorber UV-1, one route uses ethyl p-aminobenzoate, trimethyl orthoformate, and N-methylaniline as the main raw materials, while another route uses ethyl p-aminobenzoate, formic acid, and N-methylaniline as the main raw materials, and uses phosphorus oxychloride or thionyl chloride as Vilsmeier's reagent to promote the reaction. These methods are commonly used in this field to solve the problem of preparing the ultraviolet absorber UV-1. In actual production, many companies follow these raw materials and methods to obtain the desired ultraviolet absorber.
[0004] However, existing preparation methods have significant drawbacks. The main raw materials used in Route 1 are expensive, posing a cost problem for large-scale production. The reaction intensity in Route 2 is difficult to guarantee, often resulting in excessively vigorous and uncontrollable reactions. This brings numerous inconveniences and safety hazards to the production process. Furthermore, when trace amounts of moisture are present in the reaction system, phosphorus oxychloride or thionyl chloride will rapidly hydrolyze to form hydrochloric acid, phosphoric acid, or sulfurous acid, causing corrosion to the equipment and significantly reducing its service life. Summary of the Invention
[0005] To address the aforementioned technical problems, this application provides a method for preparing ultraviolet absorber UV-1.
[0006] This application provides a method for preparing an ultraviolet absorber UV-1, comprising the following steps: Ethyl p-aminobenzoate, formic acid, N-methylaniline and catalyst were blended and reacted at 0-5°C for 6-7 hours. After vacuum distillation, ultraviolet absorber UV-1 was obtained. The catalyst was FeCl4 / MSNs.
[0007] Preferably, the molar ratio of ethyl para-aminobenzoate, formic acid and N-methylaniline is 1:(1.1-1.3):(1.1-1.3).
[0008] Preferably, the molar ratio of ethyl para-aminobenzoate, formic acid and N-methylaniline is 1:1.2:1.2.
[0009] Preferably, the amount of catalyst used is 1-5 wt% of the total amount of ethyl p-aminobenzoate, formic acid and N-methylaniline.
[0010] Preferably, the amount of catalyst used is 3 wt% of the total amount of ethyl p-aminobenzoate, formic acid and N-methylaniline.
[0011] Preferably, when the ethyl p-aminobenzoate, formic acid, N-methylaniline and catalyst are blended and reacted, the pressure is controlled at 30-40 MPa.
[0012] By adopting the above technical solution, this application utilizes FeCl4 / MSNs as a catalyst to promote the reaction, without using phosphorus oxychloride or thionyl chloride as strong chlorinating agents. This significantly reduces the corrosion of industrial equipment during the preparation of UV-1 ultraviolet absorber, extending the equipment's service life. FeCl4 / MSNs can reduce the intensity of the reaction, making the overall reaction easier to control and possessing high practicality. Simultaneously, this application replaces trimethyl orthoformate in the raw materials with formic acid, greatly improving the utilization rate of the raw materials. Furthermore, this application controls the reaction temperature at 0-5℃. Under the condition that the catalyst in this application is FeCl4 / MSNs, not only can the reaction proceed smoothly, but it can also further reduce the corrosion of industrial equipment during the preparation of UV-1 ultraviolet absorber and maintain the chemical stability of formic acid.
[0013] This application also controls the reaction pressure to 30-40 MPa, a pressure range that can effectively improve the reaction rate and yield while balancing equipment cost and safety.
[0014] Overall, the preparation method of this application can improve the utilization rate of raw materials, reduce the degree of equipment corrosion, and make the reaction easier to control. It has good applicability and operability, and brings significant optimization effects to the preparation of ultraviolet absorber UV-1.
[0015] Preferably, the preparation method of the FeCl4 / MSNs includes the following steps: S1. Disperse calcined mesoporous silica in anhydrous toluene, add silane coupling agent, and reflux under inert gas protection at a temperature of 70-110℃ for 12-24h. Centrifuge, wash, and dry to obtain the support. S2. A mixture of 1-methylimidazolium and a bromoalkane is reacted to yield 1-alkyl-3-methylimidazolium bromide, which, upon the addition of chloride ions, yields Cl. - Type Ionic liquid, then reacted with acetic acid to obtain Cl - Type ionic liquid carboxylic acid derivatives, with Cl - The functionalized support is obtained by blending the ionic liquid carboxylic acid derivative, the support, and the condensing agent. The functionalized support is then blended with ferric chloride and reacted for 5-10 hours to obtain FeCl4 / MSNs.
[0016] Preferably, in step S1, the ratio of mesoporous silica to silane coupling agent is controlled to be 1:(3.5-4.5).
[0017] Preferably, in S2, Cl - When the carboxylic acid derivative, support, and condensing agent of the ionic liquid are blended, the molar ratio is 1:1:(0.8-1).
[0018] Preferably, in step S2, the weight ratio of the functionalized carrier to ferric chloride is 1:(1.8-2.5).
[0019] By adopting the above technical solution, in step S1, calcined mesoporous silica is dispersed in anhydrous toluene, a silane coupling agent is added, and the mixture is refluxed under specific conditions. After centrifugation, washing, and drying, a carrier is obtained. This process functionalizes the surface of the mesoporous silica, providing a basis for subsequent loading of active ingredients. In step S2, 1-alkyl-3-methylimidazolium bromide is obtained by reacting 1-methylimidazolium with bromoalkane, and then Cl is obtained through a series of reactions. - A type of ionic liquid carboxylic acid derivative was prepared by blending it with a support and a condensing agent to obtain a functionalized support. Finally, it was blended with ferric chloride to obtain FeCl4 / MSNs. This step further functionalized and modified the support to form a coordination structure. The prepared FeCl4 / MSNs catalyst has good catalytic activity and can be used to promote the reaction of ethyl p-aminobenzoate, formic acid and N-methylaniline. It greatly reduces the corrosion of industrial equipment in the preparation of UV-1 ultraviolet absorber, extends the service life of the equipment, reduces the intensity of the reaction, makes the overall reaction easier to control, and improves the utilization rate of raw materials.
[0020] In the specific embodiments of this application, the mesoporous silica is MCM-41, the silane coupling agent is 3-aminopropyltriethoxysilane, the bromoalkane is tert-butane bromide, and the condensing agent is dicyclohexylcarbodiimide. These are merely illustrative examples, and those skilled in the art can make reasonable adjustments according to the actual situation. They should not be used to limit the scope of protection of this application.
[0021] In summary, this application has the following beneficial technical effects: The preparation method of this application can improve the utilization rate of raw materials, reduce the degree of equipment corrosion, and make the reaction easier to control. It has good applicability and operability, and brings significant optimization effects to the preparation of ultraviolet absorber UV-1. The FeCl4 / MSNs catalyst of this application has good catalytic activity and can be used to promote the reaction of ethyl p-aminobenzoate, formic acid and N-methylaniline. It greatly reduces the corrosion of industrial equipment in the preparation of ultraviolet absorber UV-1, extends the service life of the equipment, reduces the intensity of the reaction, makes the overall reaction easier to control, and also improves the utilization rate of raw materials. Detailed Implementation
[0022] Material source Unless otherwise specified, all raw materials used in this application are commercially available products, specifically: Mesoporous silica, MCM-41, purchased from Aladdin Biochemical Technology Co., Ltd., with a specific surface area of 1310 m². 2 / g, pore volume is cm³ 3 / g.
[0023] The present application will be further described in detail below with reference to embodiments and comparative examples.
[0024] A method for preparing an ultraviolet absorber UV-1 includes the following steps: Ethyl p-aminobenzoate, formic acid, N-methylaniline and catalyst were blended and reacted at 0-5°C for 6-7 hours. After vacuum distillation, ultraviolet absorber UV-1 was obtained. The catalyst was FeCl4 / MSNs.
[0025] In a preferred embodiment of this application, the molar ratio of ethyl p-aminobenzoate, formic acid and N-methylaniline is 1:(1.1-1.3):(1.1-1.3).
[0026] In a preferred embodiment of this application, the molar ratio of ethyl p-aminobenzoate, formic acid, and N-methylaniline is 1:1.2:1.2.
[0027] In a preferred embodiment of this application, the amount of the catalyst is 1-5 wt% of the total amount of ethyl p-aminobenzoate, formic acid and N-methylaniline.
[0028] In a preferred embodiment of this application, the amount of the catalyst is 3 wt% of the total amount of ethyl p-aminobenzoate, formic acid and N-methylaniline.
[0029] In a preferred embodiment of this application, the pressure is controlled at 30-40 MPa when the ethyl p-aminobenzoate, formic acid, N-methylaniline and catalyst are blended and reacted.
[0030] In a preferred embodiment of this application, the preparation method of the FeCl4 / MSNs includes the following steps: S1. Disperse calcined mesoporous silica in anhydrous toluene, add silane coupling agent, and reflux under inert gas protection at a temperature of 70-110℃ for 12-24h. Centrifuge, wash, and dry to obtain the support. S2. A mixture of 1-methylimidazolium and a bromoalkane is reacted to yield 1-alkyl-3-methylimidazolium bromide, which, upon the addition of chloride ions, yields Cl. - Type Ionic liquid, then reacted with acetic acid to obtain Cl - Type ionic liquid carboxylic acid derivatives, with Cl - The functionalized support is obtained by blending the ionic liquid carboxylic acid derivative, the support, and the condensing agent. The functionalized support is then blended with ferric chloride and reacted for 5-10 hours to obtain FeCl4 / MSNs.
[0031] In a preferred embodiment of this application, in step S1, the ratio of mesoporous silica to silane coupling agent is controlled to be 1:(3.5-4.5).
[0032] In a preferred embodiment of this application, in S2, Cl - When the carboxylic acid derivative, support, and condensing agent of the ionic liquid are blended, the molar ratio is 1:1:(0.8-1).
[0033] In a preferred embodiment of this application, in step S2, the weight ratio of the functionalized carrier to ferric chloride is 1:(1.8-2.5).
[0034] Example 1 A method for preparing an ultraviolet absorber UV-1 includes the following steps: First, FeCl4 / MSNs were prepared, specifically as follows: S1. MCM-41 was calcined at 600℃ in air for 4 hours, then washed repeatedly with deionized water. The conductivity of the water after washing was measured until it was close to that of pure water. The washed MCM-41 was then dried in an oven to constant weight. 10g of the calcined MCM-41 was placed in anhydrous toluene, and 35g of silane coupling agent 3-aminopropyltriethoxysilane was added. The mixture was refluxed at 70℃ under nitrogen protection for 24 hours. After centrifugation, the mixture was washed with toluene and methanol in sequence, and then dried under vacuum at 60℃ to obtain the carrier. S2. 1 mol of 1-methylimidazole and 1.05 mol of tert-butane bromide were co-dispersed in anhydrous ethanol and refluxed at 80 °C for 24 h. The mixture was filtered while hot, and the solvent was removed by rotary evaporation. The solution was then washed three times with ethyl acetate and dried under vacuum to obtain 1-tert-butyl-3-methylimidazole bromide. 1.1 equivalents of AgNO3 were added, and the mixture was stirred in the dark for 6 hours. The AgBr precipitate was removed by filtration, and then 1 mol / L HCl / methanol solution was added to precipitate Cl. - Type Ionic Liquid, Cl - A type ionic liquid and chloroacetic acid were blended at a molar ratio of 1:1.5, followed by the addition of potassium carbonate as a catalyst. The mixture was reacted at 60°C for 12 hours, and the resulting product was purified by dialysis to obtain Cl. - Type ionic liquid carboxylic acid derivatives, with Cl - A type ionic liquid carboxylic acid derivative, a support, and a condensing agent dicyclohexylcarbodiimide were blended in a molar ratio of 1:1:0.8 and reacted for 24 h to obtain a functionalized support. The functionalized support and ferric chloride were blended in a weight ratio of 1:1.8 and reacted for 5 h before drying to obtain FeCl4 / MSNs. Ethyl p-aminobenzoate, formic acid, N-methylaniline, and FeCl4 / MSNs were blended, with the molar ratio of ethyl p-aminobenzoate, formic acid, and N-methylaniline controlled at 1:1.1:1.3. The amount of FeCl4 / MSNs was 1 wt% of the total weight of ethyl p-aminobenzoate, formic acid, and N-methylaniline. The mixture was reacted at 0°C for 7 h. After standing and separating into layers, the aqueous phase was removed, and the oil phase was subjected to vacuum distillation to remove unreacted substances, yielding the ultraviolet absorber UV-1.
[0035] Example 2 A method for preparing an ultraviolet absorber UV-1 includes the following steps: First, FeCl4 / MSNs were prepared, specifically as follows: S1. MCM-41 was calcined at 600℃ in air for 4 hours, then washed repeatedly with deionized water. The conductivity of the water after washing was measured until it was close to that of pure water. The washed MCM-41 was then dried in an oven to constant weight. 10g of the calcined MCM-41 was placed in anhydrous toluene, and 45g of silane coupling agent 3-aminopropyltriethoxysilane was added. The mixture was refluxed at 110℃ under nitrogen protection for 12 hours. After centrifugation, the mixture was washed with toluene and methanol in sequence, and then dried under vacuum at 60℃ to obtain the support. S2. 1 mol of 1-methylimidazole and 1.05 mol of tert-butane bromide were co-dispersed in anhydrous ethanol and refluxed at 80 °C for 24 h. The mixture was filtered while hot, and the solvent was removed by rotary evaporation. The solution was then washed three times with ethyl acetate and dried under vacuum to obtain 1-tert-butyl-3-methylimidazole bromide. 1.1 equivalents of AgNO3 were added, and the mixture was stirred in the dark for 6 hours. The AgBr precipitate was removed by filtration, and then 1 mol / L HCl / methanol solution was added to precipitate Cl. - Type Ionic Liquid, Cl - A type ionic liquid and chloroacetic acid were blended at a molar ratio of 1:1.5, followed by the addition of potassium carbonate as a catalyst. The mixture was reacted at 60°C for 12 hours, and the resulting product was purified by dialysis to obtain Cl. - Type ionic liquid carboxylic acid derivatives, with Cl - A type ionic liquid carboxylic acid derivative, a support, and a condensing agent dicyclohexylcarbodiimide were blended in a molar ratio of 1:1:1 and reacted for 24 h to obtain a functionalized support. The functionalized support and ferric chloride were blended in a weight ratio of 1:2.5 and reacted for 10 h before drying to obtain FeCl4 / MSNs. Ethyl p-aminobenzoate, formic acid, N-methylaniline, and FeCl4 / MSNs were blended, with the molar ratio of ethyl p-aminobenzoate, formic acid, and N-methylaniline controlled at 1:1.3:1.1. The amount of FeCl4 / MSNs was 5 wt% of the total weight of ethyl p-aminobenzoate, formic acid, and N-methylaniline. The mixture was reacted at 5°C for 6 hours. After standing and separating into layers, the aqueous phase was removed, and the oil phase was subjected to vacuum distillation to remove unreacted substances, yielding the ultraviolet absorber UV-1.
[0036] Example 3 A method for preparing an ultraviolet absorber UV-1 includes the following steps: First, FeCl4 / MSNs were prepared, specifically as follows: S1. MCM-41 was calcined at 600℃ in air for 4 hours, then washed repeatedly with deionized water. The conductivity of the water after washing was measured until it was close to that of pure water. The washed MCM-41 was then dried in an oven to constant weight. 10g of the calcined MCM-41 was placed in anhydrous toluene, and 40g of silane coupling agent 3-aminopropyltriethoxysilane was added. The mixture was refluxed at 90℃ under nitrogen protection for 18 hours. After centrifugation, the mixture was washed with toluene and methanol in sequence, and then dried under vacuum at 60℃ to obtain the carrier. S2. 1 mol of 1-methylimidazole and 1.05 mol of tert-butane bromide were co-dispersed in anhydrous ethanol and refluxed at 80 °C for 24 h. The mixture was filtered while hot, and the solvent was removed by rotary evaporation. The solution was then washed three times with ethyl acetate and dried under vacuum to obtain 1-tert-butyl-3-methylimidazole bromide. 1.1 equivalents of AgNO3 were added, and the mixture was stirred in the dark for 6 hours. The AgBr precipitate was removed by filtration, and then 1 mol / L HCl / methanol solution was added to precipitate Cl. - Type Ionic Liquid, Cl - A type ionic liquid and chloroacetic acid were blended at a molar ratio of 1:1.5, followed by the addition of potassium carbonate as a catalyst. The mixture was reacted at 60°C for 12 hours, and the resulting product was purified by dialysis to obtain Cl. - Type ionic liquid carboxylic acid derivatives, with Cl - A type ionic liquid carboxylic acid derivative, a support, and a condensing agent dicyclohexylcarbodiimide were blended in a molar ratio of 1:1:0.9 and reacted for 24 h to obtain a functionalized support. The functionalized support and ferric chloride were blended in a weight ratio of 1:2 and reacted for 7.5 h before drying to obtain FeCl4 / MSNs. Ethyl p-aminobenzoate, formic acid, N-methylaniline, and FeCl4 / MSNs were blended, with the molar ratio of ethyl p-aminobenzoate, formic acid, and N-methylaniline controlled at 1:1.2:1.2. The amount of FeCl4 / MSNs was 3 wt% of the total weight of ethyl p-aminobenzoate, formic acid, and N-methylaniline. The mixture was reacted at 3°C for 6.5 h. After standing and separation, the aqueous phase was removed, and the oil phase was subjected to vacuum distillation to remove unreacted substances, yielding the ultraviolet absorber UV-1.
[0037] Comparative Example 1 Includes the following steps: Ethyl p-aminobenzoate, triethyl orthoformate, and phosphorus oxychloride were blended, with the molar ratio of ethyl p-aminobenzoate, triethyl orthoformate, and phosphorus oxychloride controlled at 1:1.3:1. The mixture was reacted at 70°C for 6 hours. After standing and separating into layers, the aqueous phase was removed, and the oil phase was subjected to vacuum distillation to remove unreacted substances, yielding the ultraviolet absorber UV-1.
[0038] Comparative Example 2 Includes the following steps: Ethyl p-aminobenzoate, triethyl orthoformate, and thionyl chloride were blended, with the molar ratio of ethyl p-aminobenzoate, triethyl orthoformate, and thionyl chloride controlled at 1:1.3:1. The mixture was reacted at 70°C for 6 hours. After standing and separating into layers, the aqueous phase was removed, and the oil phase was subjected to vacuum distillation to remove unreacted substances, yielding the ultraviolet absorber UV-1.
[0039] Comparative Example 3 The difference from Example 1 is that ethyl p-aminobenzoate, formic acid, N-methylaniline, and FeCl4 / MSNs were blended, with the molar ratio of ethyl p-aminobenzoate, formic acid, and N-methylaniline controlled at 1:1.2:1.2. The amount of FeCl4 / MSNs was 3 wt% of the total weight of ethyl p-aminobenzoate, formic acid, and N-methylaniline. The mixture was reacted at 50°C for 6.5 h. After standing and separating, the aqueous phase was removed, and the oil phase was subjected to vacuum distillation to remove unreacted substances, yielding the ultraviolet absorber UV-1.
[0040] Performance testing The yield and purity of UV-1, the ultraviolet absorber obtained in the test examples and comparative examples, were determined. A 304 stainless steel hanging plate was installed at the reactor outlet pipeline. After three months of operation, the uniform corrosion rate (mm / year) and pitting coefficient were measured.
[0041] Table 1 Data Record Table Group Yield % purity% Uniform corrosion rate (mm / year) Pitting coefficient Example 1 99.2 99.5 0.08 1.4 Example 2 99.1 99.5 0.08 1.3 Example 3 99.6 99.6 0.08 1.1 Comparative Example 1 99.3 99.4 0.45 6.4 Comparative Example 2 99.2 99.4 0.43 6.2 Comparative Example 3 84.5 99.2 0.15 1.4 Data Analysis: As can be seen from Table 1, the preparation methods of Examples 1-3 of this application can obtain UV-1 ultraviolet absorber with a yield of not less than 99.1% and a purity of not less than 99.5%. The uniform corrosion rate after three months of equipment operation is 0.08 mm / year, and the pitting corrosion coefficient is as low as 1.1-1.4. In contrast, the uniform corrosion rate in Comparative Examples 1-2 reached 0.43-0.45 mm / year, and the pitting corrosion coefficient was as high as 6.2-6.4. It can be seen that the preparation method of this application can improve the utilization rate of raw materials, reduce the degree of equipment corrosion, and make the reaction easier to control. It has good applicability and operability, and brings significant optimization effects to the preparation of UV-1 ultraviolet absorber.
[0042] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A method for preparing an ultraviolet absorber UV-1, characterized in that, Includes the following steps: Ethyl p-aminobenzoate, formic acid, N-methylaniline and catalyst were blended and reacted at 0-5°C for 6-7 hours. After vacuum distillation, ultraviolet absorber UV-1 was obtained. The catalyst was FeCl4 / MSNs.
2. The method for preparing UV-1, an ultraviolet absorber according to claim 1, is characterized in that, The molar ratio of ethyl p-aminobenzoate, formic acid and N-methylaniline is 1:(1.1-1.3):(1.1-1.3).
3. The method for preparing UV-1, an ultraviolet absorber according to claim 2, is characterized in that, The molar ratio of ethyl para-aminobenzoate, formic acid and N-methylaniline is 1:1.2:1.
2.
4. The method for preparing UV-1, an ultraviolet absorber according to claim 1, is characterized in that, The amount of catalyst used is 1-5 wt% of the total amount of ethyl p-aminobenzoate, formic acid, and N-methylaniline.
5. The method for preparing UV-1, an ultraviolet absorber according to claim 4, is characterized in that, The catalyst is used in an amount of 3 wt% of the total amount of ethyl p-aminobenzoate, formic acid, and N-methylaniline.
6. The method for preparing UV-1, an ultraviolet absorber according to claim 1, is characterized in that, When the ethyl p-aminobenzoate, formic acid, N-methylaniline and catalyst are blended and reacted, the pressure is controlled at 30-40 MPa.
7. The method for preparing UV-1, an ultraviolet absorber according to claim 1, is characterized in that, The preparation method of the FeCl4 / MSNs includes the following steps: S1. Disperse calcined mesoporous silica in anhydrous toluene, add silane coupling agent, and reflux under inert gas protection at a temperature of 70-110℃ for 12-24h. Centrifuge, wash, and dry to obtain the support. S2. A mixture of 1-methylimidazolium and a bromoalkane is reacted to yield 1-alkyl-3-methylimidazolium bromide, which, upon the addition of chloride ions, yields Cl. - Type Ionic liquid, then reacted with acetic acid to obtain Cl - Type ionic liquid carboxylic acid derivatives, with Cl - The functionalized support is obtained by blending the ionic liquid carboxylic acid derivative, the support, and the condensing agent. The functionalized support is then blended with ferric chloride and reacted for 5-10 hours to obtain FeCl4 / MSNs.
8. The method for preparing UV-1, an ultraviolet absorber according to claim 7, is characterized in that, In step S1, the ratio of mesoporous silica to silane coupling agent is controlled to be 1:(3.5-4.5).
9. The method for preparing UV-1, an ultraviolet absorber according to claim 7, is characterized in that, In S2, Cl - When the carboxylic acid derivative, support, and condensing agent of the ionic liquid are blended, the molar ratio is 1:1:(0.8-1).
10. The method for preparing UV-1, an ultraviolet absorber according to claim 7, is characterized in that, In S2, the weight ratio of the functionalized carrier to ferric chloride is 1:(1.8-2.5).