A process for the preparation of a sunscreen octyl triazone
By modifying the dispersion and adsorption properties of activated carbon and potassium carbonate, and combining them with dehydrating agents such as molecular sieves, the problem of water removal in the synthesis of octyltriazine ketone was solved, thereby improving product quality and the performance of sunscreens.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHANGZHOU YONGHE FINE CHEM
- Filing Date
- 2024-04-17
- Publication Date
- 2026-05-19
AI Technical Summary
In existing methods for synthesizing octyltriazine ketone, the drying process affects product quality because moisture is difficult to remove effectively.
Activated carbon modified with γ-aminopropyltriethoxysilane and potassium carbonate, combined with a dehydrating agent composed of molecular sieves, additives, binders and calcined lime, is used to reduce moisture and improve product quality through steps such as esterification, catalytic hydrogenation, and reflux heating. This is achieved by utilizing the dispersion and adsorption properties of the modified activated carbon and potassium carbonate, along with a secondary adsorption mechanism.
It effectively reduces the moisture content in octyltriazine ketone products, improves product purity and quality, reduces by-product content, and enhances the waterproof effect and stability of sunscreen agents.
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Abstract
Description
Technical Field
[0001] This application relates to the technical field of octyltriazinone preparation, and in particular to a method for preparing the sunscreen octyltriazinone. Background Technology
[0002] Isooctyl para-aminobenzoate is an important raw material for the sunscreen agent octyltriazinone. Octyltriazinone is a novel type of ultraviolet (UV) absorber developed in recent years. It has a large molecular structure and high UV absorption efficiency, providing protection against both UVB and UVA rays, thus offering broad-spectrum sun protection. It can be used as an additive in sunscreen products and is currently the most potent oil-soluble UVB absorber on the market. Furthermore, it exhibits high photostability, prevents UVB-induced immunosuppression, is highly water-resistant, and has good affinity for skin keratin. As a sunscreen agent, octyltriazinone has the advantages of high absorption rate and low dosage. Typically, only a very small amount is needed in sunscreen products to achieve a high SPF value and excellent water resistance. However, the commonly used synthesis methods for octyltriazinone generate water during the synthesis process, requiring drying and dehydration. Since drying involves a certain temperature, this can affect the quality of the final product. Summary of the Invention
[0003] In order to improve the quality of the product, this application provides a method for preparing the sunscreen agent octyltriazine ketone.
[0004] This application provides a method for preparing the sunscreen agent octyltriazine ketone, which adopts the following technical solution:
[0005] A method for preparing the sunscreen agent octyltriazine ketone includes the following steps:
[0006] Esterification reaction: p-Nitrobenzoic acid is esterified with isooctanol to obtain product A;
[0007] Catalytic hydrogenation: Product A is hydrogenated in the presence of a catalyst, filtered, and water is separated. A dehydrating agent is added to the remaining liquid for further dehydration, followed by filtration, cooling, separation, and drying to obtain product B. The dehydrating agent comprises component A and component B. Component A consists of the following components by weight: 50-80 parts molecular sieve raw material, 20-30 parts additives, 15-25 parts binder, 1-5 parts synthesis agent, and 5-10 parts calcined lime. Component B consists of γ-aminopropyltriethoxysilane, activated carbon, and potassium carbonate.
[0008] Reflux: Add product B to the solvent and heat to reflux. Add a mixture of cyanuric chloride and toluene to react. Wash with water, remove solvent, and crystallize to obtain octyltriazine ketone.
[0009] By adopting the above technical solution, γ-aminopropyltriethoxysilane is used to modify activated carbon and potassium carbonate, thereby improving the dispersion performance of activated carbon and potassium carbonate and obtaining component B with better dispersion effect. Molecular sieve raw materials, additives, binders, synthetic agents, and calcined lime constitute component A with good water absorption effect. Moreover, the calcined lime and activated carbon in component A can strongly adsorb water. After the adsorbent absorbs a certain amount of water, potassium carbonate will perform secondary adsorption, thereby removing water and reducing the water content in product B, thus improving the quality of the obtained product.
[0010] In one specific implementation, the preparation method of component B includes the following steps:
[0011] γ-aminopropyltriethoxysilane, ethanol, and water were stirred and mixed evenly to obtain the modified solution;
[0012] Activated carbon and potassium carbonate are stirred and mixed evenly to obtain mixture A. During the stirring process, a modifying liquid is sprayed into mixture A. After spraying is completed, stirring is continued and the mixture is dried to obtain component B.
[0013] By adopting the above technical solution, γ-aminopropyltriethoxysilane is first dissolved in ethanol to obtain a modified liquid. Then, while stirring activated carbon and potassium carbonate, the modified liquid is sprayed onto the activated carbon and potassium carbonate, so that γ-aminopropyltriethoxysilane coats the activated carbon and potassium carbonate, resulting in component B with better dispersion performance.
[0014] In one specific implementation, the weight ratio of the modified liquid to the mixture A is 1:(13-14).
[0015] By adopting the above technical solution, the ratio of modified liquid to mixture A is further limited, so that γ-aminopropyltriethoxysilane can better encapsulate activated carbon and potassium carbonate, thus improving the effect of obtaining component B.
[0016] In one specific implementation, the additive is a mixture of attapulgite and bentonite.
[0017] In one specific implementation, the binder is a mixture of kaolin and sodium carboxymethyl cellulose.
[0018] In one specific feasible implementation, the synthetic agent is guar gum powder.
[0019] In one specific implementation, the method for preparing the dehydrating agent includes the following steps:
[0020] Molecular sieve raw materials, additives, binders, and calcined lime are stirred and mixed evenly to obtain mixture B; mixture B is added to a pelletizing machine and shaped to obtain pre-formed pellets; the pre-formed pellets are dehumidified and activated at high temperature to obtain crude product;
[0021] The crude product and the synthetic agent are stirred and mixed evenly to obtain mixture C. Then, the adhesive solvent is added to mixture C and stirred and mixed evenly. Finally, it is added to the pelletizer for pelletizing, drying, and calcining to obtain component A.
[0022] Mix components A and B thoroughly to obtain a dehydrating agent.
[0023] By adopting the above technical solution, the molecular sieve raw materials, additives, binders, and calcined lime are first stirred and mixed evenly, and then shaped to obtain pre-formed pellets. Next, the synthetic agent and adhesive are added, stirred and mixed evenly, and pelletized to obtain component A. Finally, component A and component B are stirred and mixed evenly to obtain a dewatering agent with good water absorption effect.
[0024] In one specific implementation, the weight ratio of component A to component B in the dehydrating agent is 1:(2-3).
[0025] By adopting the above technical solution, the ratio of component A and component B is further defined, thereby further improving the water absorption effect of the dehydrating agent.
[0026] In summary, this application includes at least one of the following beneficial technical effects:
[0027] 1. In this application, γ-aminopropyltriethoxysilane is used to modify activated carbon and potassium carbonate, thereby improving the dispersion performance of activated carbon and potassium carbonate and obtaining component B with better dispersion effect; molecular sieve raw materials, additives, binders, synthetic agents and calcined lime constitute component A with good water absorption effect, and the calcined lime and activated carbon in component A can strongly adsorb water. After the adsorbent absorbs a certain amount of water, potassium carbonate will perform secondary adsorption, thereby removing water and reducing the water in product B, thus improving the quality of the obtained product.
[0028] 2. In this application, γ-aminopropyltriethoxysilane is first dissolved in ethanol to obtain a modified liquid. Then, while stirring activated carbon and potassium carbonate, the modified liquid is sprayed onto the activated carbon and potassium carbonate, so that γ-aminopropyltriethoxysilane coats the activated carbon and potassium carbonate, resulting in component B with better dispersion performance.
[0029] 3. In this application, molecular sieve raw materials, additives, binders, and calcined lime are first stirred and mixed evenly, and then shaped to obtain pre-formed pellets. Next, synthetic agents and adhesives are added, stirred and mixed evenly, and pelletized to obtain component A. Finally, component A and component B are stirred and mixed evenly to obtain a dewatering agent with good water absorption effect. Detailed Implementation
[0030] The present application will be further described in detail below with reference to the embodiments.
[0031] All raw materials used in the examples are commercially available.
[0032] Preparation Example
[0033] Preparation Example 1
[0034] Preparation Example 1 provides a method for preparing a dehydrating agent, comprising the following steps:
[0035] 50 kg of molecular sieve raw material, 20 kg of additive, 15 kg of binder, and 5 kg of calcined lime were stirred at 720 rpm for 35 min to obtain mixture B. Mixture B was added to a pelletizing machine and shaped to obtain pre-formed pellets. The pre-formed pellets were dehumidified at 145℃ and activated at 445℃ to obtain a crude product. The molecular sieve raw material was 4A molecular sieve powder. The additive was a mixture of attapulgite and bentonite in a weight ratio of 1:1. The binder was a mixture of kaolin and sodium carboxymethyl cellulose in a weight ratio of 1:1.
[0036] The crude product and 1 kg of the synthesizing agent were stirred and mixed evenly to obtain mixture C. Then, the adhesive solvent was added to mixture C and stirred evenly. Finally, the mixture was added to a pelletizing machine for pelletizing. The pellets were dried at 115℃ for 1.4 h and calcined at 550℃ for 1.8 h to obtain component A. The synthesizing agent was guar gum powder; the adhesive solvent was a 55% nitric acid solution, and the weight ratio of the adhesive solvent to mixture C was 1:20.
[0037] γ-aminopropyltriethoxysilane, ethanol, and water were stirred and mixed evenly to obtain a modified solution; wherein the weight ratio of γ-aminopropyltriethoxysilane, ethanol, and water was 5:18:2.
[0038] Activated carbon and potassium carbonate were stirred and mixed evenly to obtain mixture A. During the stirring process, a modifying liquid was sprayed into mixture A. After spraying, stirring was continued for 0.5 hours, and then dried at 100°C for 1 hour to obtain component B. The weight ratio of activated carbon to potassium carbonate in mixture A was 1:1, and the weight ratio of the modifying liquid to mixture A was 1:12.5.
[0039] Mix components A and B thoroughly to obtain a dehydrating agent; the weight ratio of components A to B is 1:1.5.
[0040] Preparation Example 2
[0041] The difference between Preparation Example 2 and Preparation Example 1 is that the weight ratio of the modified liquid to mixture A is 1:13; the remaining steps are the same as those in Preparation Example 1.
[0042] Preparation Example 3
[0043] The difference between Preparation Example 3 and Preparation Example 1 is that the weight ratio of the modified liquid to mixture A is 1:13.5; the remaining steps are the same as those in Preparation Example 1.
[0044] Preparation Example 4
[0045] The difference between Preparation Example 4 and Preparation Example 1 is that the weight ratio of the modified liquid to mixture A is 1:14; the remaining steps are the same as those in Preparation Example 1.
[0046] Preparation Example 5
[0047] The difference between Preparation Example 5 and Preparation Example 1 is that the weight ratio of the modified liquid to mixture A is 1:14.5; the remaining steps are the same as those in Preparation Example 1.
[0048] Preparation Example 6
[0049] The difference between Preparation Example 6 and Preparation Example 3 is that the weight ratio of component A to component B is 1:2; the remaining steps are the same as those in Preparation Example 3.
[0050] Preparation Example 7
[0051] The difference between Preparation Example 7 and Preparation Example 3 is that the weight ratio of component A to component B is 1:2.5; the remaining steps are the same as those in Preparation Example 3.
[0052] Preparation Example 8
[0053] The difference between Preparation Example 8 and Preparation Example 3 is that the weight ratio of component A to component B is 1:3; the remaining steps are the same as those in Preparation Example 3.
[0054] Preparation Example 9
[0055] The difference between Preparation Example 9 and Preparation Example 3 is that the weight ratio of component A to component B is 1:3.5; the remaining steps are the same as those in Preparation Example 3.
[0056] Preparation Example 10
[0057] The difference between Preparation Example 10 and Preparation Example 7 is that 65 kg of molecular sieve raw material, 25 kg of additive, 20 kg of binder, and 8 kg of calcined lime were stirred at a speed of 720 rpm for 35 min to obtain mixture B.
[0058] The crude product and 3 kg of synthetic agent were stirred and mixed evenly to obtain mixture C. Then, the adhesive solvent was added to mixture C and stirred and mixed evenly. Finally, it was added to a pelletizer for pelletizing, dried at 115°C for 1.4 h, and calcined at 550°C for 1.8 h to obtain component A. The remaining steps were the same as those in preparation example 7.
[0059] Preparation Example 11
[0060] The difference between Preparation Example 11 and Preparation Example 7 is that 80 kg of molecular sieve raw material, 30 kg of additive, 25 kg of binder, and 10 kg of calcined lime were stirred at a speed of 720 rpm for 35 min to obtain mixture B.
[0061] The crude product and 5 kg of synthetic agent were stirred and mixed evenly to obtain mixture C. Then, the adhesive solvent was added to mixture C and stirred and mixed evenly. Finally, it was added to a pelletizer for pelletizing, dried at 115°C for 1.4 h, and calcined at 550°C for 1.8 h to obtain component A. The remaining steps were the same as those in preparation example 7.
[0062] Preparation Example 12
[0063] The difference between Preparation Example 12 and Preparation Example 10 is that the binder is kaolin; the remaining steps are the same as those in Preparation Example 10.
[0064] Preparation Example 13
[0065] The difference between Preparation Example 13 and Preparation Example 10 is that sodium carboxymethyl cellulose is used as the binder; the remaining steps are the same as in Preparation Example 10.
[0066] Preparation Example 14
[0067] The difference between Preparation Example 14 and Preparation Example 10 is that the additive is attapulgite; the remaining steps are the same as those in Preparation Example 10.
[0068] Preparation Example 15
[0069] The difference between Preparation Example 15 and Preparation Example 10 is that the additive is bentonite; the remaining steps are the same as those in Preparation Example 10.
[0070] Preparation Example 16
[0071] Preparation Example 16 provides a method for preparing a dehydrating agent, comprising the following steps:
[0072] 50 kg of molecular sieve raw material, 20 kg of additive, 15 kg of binder, and 5 kg of calcined lime were stirred at 720 rpm for 35 min to obtain mixture B. Mixture B was added to a pelletizing machine and shaped to obtain pre-formed pellets. The pre-formed pellets were dehumidified at 145℃ and activated at 445℃ to obtain a crude product. The molecular sieve raw material was 4A molecular sieve powder. The additive was a mixture of attapulgite and bentonite in a weight ratio of 1:1. The binder was a mixture of kaolin and sodium carboxymethyl cellulose in a weight ratio of 1:1.
[0073] The crude product and 1 kg of the synthetic agent were stirred and mixed evenly to obtain mixture C. Then, the adhesive solvent was added to mixture C and stirred evenly. Finally, the mixture was added to a pelletizing machine for pelletizing. The pellets were dried at 115°C for 1.4 h and calcined at 550°C for 1.8 h to obtain the dehydrating agent. The synthetic agent was guar gum powder. The adhesive solvent was a 55% nitric acid solution, and the weight ratio of the adhesive solvent to mixture C was 1:20.
[0074] Preparation Example 17
[0075] The difference between Preparation Example 17 and Preparation Example 1 is that the activated carbon was stirred and mixed evenly to obtain mixture A. During the stirring process, the modified liquid was sprayed into mixture A. After the spraying was completed, stirring was continued for 0.5 h, and then dried at 100°C for 1 h to obtain component B. The remaining steps were the same as those in Preparation Example 1.
[0076] Preparation Example 18
[0077] The difference between Preparation Example 18 and Preparation Example 1 is that potassium carbonate was stirred and mixed evenly to obtain mixture A. During the stirring process, a modified liquid was sprayed into mixture A. After the spraying was completed, stirring was continued for 0.5 h, and then dried at 100 °C for 1 h to obtain component B. The remaining steps were the same as those in Preparation Example 1.
[0078] Example
[0079] Example 1
[0080] Example 1 provides a method for preparing the sunscreen agent octyltriazine ketone, comprising the following steps:
[0081] Esterification reaction: p-Nitrobenzoic acid and isooctanol were esterified at 100℃ for 3 h using p-toluenesulfonic acid as a catalyst to obtain product A; wherein the molar ratio of p-nitrobenzoic acid to isooctanol was 1:2.5; and the molar ratio of p-nitrobenzoic acid to p-toluenesulfonic acid was 1:0.15.
[0082] Catalytic hydrogenation: Isooctanol was added to product A, and hydrogenation was carried out under a catalyst. The mixture was filtered and water was separated. The dehydrating agent from Preparation Example 1 was added to the remaining liquid for dehydration. The dehydrating agent was removed by filtration, and the mixture was cooled, separated, and dried to obtain product B. The catalyst was a palladium-on-carbon catalyst. The weight ratio of isooctanol to isooctyl p-nitrobenzoate was 1:1.2. The weight ratio of palladium-on-carbon catalyst to isooctyl p-nitrobenzoate was 0.005:1.
[0083] Reflux: Add product B to the solvent and heat to reflux at 109°C. Add a mixture of cyanuric chloride and toluene to react. Wash with water, remove solvent, and crystallize to obtain octyltriazine ketone. The solvent is toluene, and the weight ratio of product B to solvent is 1:3. The weight ratio of cyanuric chloride to toluene is 1:19.
[0084] Example 2-15
[0085] As shown in Table 1, the difference between Examples 2-15 and Example 1 lies in the selection of the dehydrating agent.
[0086] Table 1 Selection of Dehydrating Agents
[0087]
[0088]
[0089] Comparative Example
[0090] Comparative Example 1
[0091] Comparative Example 1 provides a method for preparing the sunscreen agent octyltriazine ketone, comprising the following steps:
[0092] Esterification reaction: p-Nitrobenzoic acid and isooctanol were esterified at 100℃ for 3 h using p-toluenesulfonic acid as a catalyst to obtain product A; wherein the molar ratio of p-nitrobenzoic acid to isooctanol was 1:2.5; and the molar ratio of p-nitrobenzoic acid to p-toluenesulfonic acid was 1:0.15.
[0093] Catalytic hydrogenation: Isooctanol is added to product A, and hydrogenation reaction is carried out under a catalyst. The product is then filtered and distilled under reduced pressure to obtain product B. The catalyst is a palladium-on-carbon catalyst. The weight ratio of isooctanol to isooctyl p-nitrobenzoate is 1:1.2. The weight ratio of palladium-on-carbon catalyst to isooctyl p-nitrobenzoate is 0.005:1.
[0094] Reflux: Add solvent to product B and heat to reflux at 109°C. Add a mixture of cyanuric chloride and toluene to react. Wash with water, remove solvent, crystallize, and dry to obtain octyltriazine ketone. The solvent is toluene, and the weight ratio of product B to solvent is 1:3. The weight ratio of cyanuric chloride to toluene is 1:19.
[0095] Comparative Example 2
[0096] The difference between Comparative Example 2 and Example 1 is that in the catalytic hydrogenation step, the dehydrating agent from Preparation Example 16 is added to the remaining feed liquid for dehydration, the dehydrating agent is removed by filtration, and the product is cooled, separated, and dried to obtain product B; the remaining steps are the same as in Example 1.
[0097] Comparative Example 3
[0098] The difference between Comparative Example 3 and Example 1 is that in the catalytic hydrogenation step, the dehydrating agent from Preparation Example 17 is added to the remaining feed liquid to remove water, the dehydrating agent is removed by filtration, and the product is cooled, separated, and dried to obtain product B; the remaining steps are the same as in Example 1.
[0099] Comparative Example 4
[0100] The difference between Comparative Example 4 and Example 1 is that in the catalytic hydrogenation step, the dehydrating agent from Preparation Example 18 is added to the remaining feed liquid to remove water, the dehydrating agent is removed by filtration, and the product is cooled, separated, and dried to obtain product B; the remaining steps are the same as in Example 1.
[0101] Performance testing: Moisture content of the products obtained in each example was measured. The lower the moisture content, the higher the quality of the product.
[0102] Table 2 Performance test results of octyltriazinone products
[0103] sample Moisture content (‰) Example 1 0.9 Example 2 0.5 Example 3 0.5 Example 4 0.5 Example 5 0.8 Example 6 0.3 Example 7 0.2 Example 8 0.2 Example 9 0.5 Example 10 0 Example 11 0.1 Example 12 0.3 Example 13 0.2 Example 14 0.2 Example 15 0.3 Comparative Example 1 3.0 Comparative Example 2 2.2 Comparative Example 3 1.3 Comparative Example 4 1.2
[0104] Combining Example 1 and Comparative Examples 1-4, the octyltriazine ketone product in Example 1 has better purity and fewer byproducts. This shows that during catalytic hydrogenation, the dehydrating agent described in this application is used for dehydration. Both components A and B in the dehydrating agent have good water absorption effects. Furthermore, the γ-aminopropyltriethoxysilane in component B ensures uniform dispersion of activated carbon and potassium carbonate. The combination of calcined lime and activated carbon in component A can strongly adsorb moisture. After the adsorbent absorbs a certain amount of moisture, potassium carbonate will perform secondary adsorption, thereby achieving a good dehydration effect and reducing the moisture in product B. Therefore, the quality of the final octyltriazine ketone product is improved.
[0105] Based on Examples 1-5, the octyltriazine ketone products in Examples 2-4 have better purity and fewer byproducts. It can be seen that when preparing component B, the preferred ratio of modified liquid to mixture A is 1:(13-14), which results in better water absorption performance of component B.
[0106] Combining Examples 3 and 6-9, the octyltriazine ketone product in Examples 6-8 has better purity and fewer byproducts. It can be seen that when preparing the dehydrating agent, the preferred ratio of component A to component B is 1:(2-3), and the dehydrating agent has better water absorption performance.
[0107] Combining Examples 7, 10, and 11, the octyltriazine ketone product in Example 10 has better purity and fewer byproducts. It can be seen that when preparing component A, increasing the amount of raw materials used results in a trend of first increasing and then decreasing the water absorption performance of component A.
[0108] Combining Examples 10, 12 and 13, the octyltriazine ketone product in Example 10 has better purity and fewer byproducts. It can be seen that when preparing component A, the binder is preferably a mixture of kaolin and sodium carboxymethyl cellulose, which results in component A having better water absorption properties.
[0109] Combining Examples 10, 14 and 15, the octyltriazine ketone product in Example 10 has better purity and fewer byproducts. It can be seen that when preparing component A, the additive is preferably a mixture of attapulgite and bentonite, which results in component A having better water absorption properties.
[0110] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.
Claims
1. A method for preparing the sunscreen agent octyltriazineone, characterized in that: Includes the following steps: Esterification reaction: p-Nitrobenzoic acid is esterified with isooctanol to obtain product A; Catalytic hydrogenation: Product A is hydrogenated in the presence of a catalyst, filtered, and water is separated. A dehydrating agent is added to the remaining liquid for further dehydration, followed by filtration, cooling, separation, and drying to obtain product B. The dehydrating agent comprises component A and component B. Component A consists of the following components by weight: 50-80 parts molecular sieve raw material, 20-30 parts additives, 15-25 parts binder, 1-5 parts synthesis agent, and 5-10 parts calcined lime. Component B consists of γ-aminopropyltriethoxysilane, activated carbon, and potassium carbonate. The additives are a mixture of attapulgite and bentonite. The binder is a high-quality... The mixture comprises kaolin and sodium carboxymethyl cellulose; the synthesizing agent is guar gum powder; the preparation method of the dehydrating agent includes the following steps: mixing molecular sieve raw materials, additives, binders, and calcined lime evenly to obtain mixture B; adding mixture B to a pelletizing machine for molding to obtain pre-formed pellets; dehumidifying and activating the pre-formed pellets at high temperature to obtain a crude product; mixing the crude product and the synthesizing agent evenly to obtain mixture C; then adding a glue solvent to mixture C, mixing evenly, and finally adding it to a pelletizing machine for pelletizing, drying, and calcining to obtain component A; mixing component A and component B evenly to obtain the dehydrating agent; Reflux heating: Product B is added to the solvent and heated to reflux. A mixture of cyanuric chloride and toluene is added to react. The mixture is then washed with water, desolventized, and crystallized to obtain octyltriazine ketone. The preparation method of component B includes the following steps: γ-aminopropyltriethoxysilane, ethanol, and water are stirred and mixed evenly to obtain a modified solution; activated carbon and potassium carbonate are stirred and mixed evenly to obtain mixture A. During stirring, the modified solution is sprayed into mixture A. After spraying, stirring is continued, and the mixture is dried to obtain component B. The weight ratio of the modified solution to mixture A is 1:(13-14).
2. The method for preparing the sunscreen agent octyltriazine ketone according to claim 1, characterized in that: The weight ratio of component A to component B in the dehydrating agent is 1:(2-3).