Synthesis method of bis-ethyl hexyloxyphenol methoxyphenyl triazine

Abstract

The invention discloses a synthesis method of bis-ethyl hexyloxyphenol methoxyphenyl triazine, which relates to the technical field of organic chemistry, and comprises the following steps: preparing an intermediate I, putting zinc chloride into reaction, adding xylene for dispersion, dropwise adding the intermediate I, resorcinol and xylene solvent to obtain a yellow intermediate II crude product, and then adding the yellow intermediate II crude product into the reaction kettle to obtain the bis-ethyl hexyloxyphenol methoxyphenyl triazine. Adding the intermediate II, a xylene solvent, an acid-binding agent, chloro-isooctane and bromo-isooctane into a reaction kettle, carrying out reaction treatment to obtain a high-purity product, and carrying out sampling detection on the step 1, the step 2 and the step 3. According to the synthesis method of the bis-ethyl hexyloxyphenol methoxyphenyl triazine, p-bromoanisole and chloro-isooctane or bromo-isooctane are adopted as raw materials, the production cost is reduced, xylene is a single solvent, the problem that a mixed solvent is difficult to recycle is solved, anhydrous aluminum chloride or anhydrous zinc chloride is adopted as a catalyst, and a recrystallization technology is adopted, so that the yield of the bis-ethyl hexyloxyphenol methoxyphenyl triazine is increased. The purity of the product is improved, and the bis-ethyl hexyloxyphenol methoxyphenyl triazine with higher purity is prepared.

Description

Technical Field

[0001] This invention relates to the field of organic chemistry, and in particular to a method for synthesizing bis-ethylhexyloxyphenol methoxyphenyl triazine. Background Technology

[0002] Bis-ethylhexyloxyphenol methoxyphenyl triazine is a highly efficient ultraviolet absorber, widely used as a sunscreen in high-end cosmetics. In recent years, with in-depth scientific research and continuous development, its special sunscreen properties have led to its gradual application in the rubber and plastics additives industry as an anti-aging agent, heat stabilizer, and plasticizer.

[0003] Adding sunscreen to cosmetics is to absorb ultraviolet rays from sunlight, protecting the skin from sunburn. In recent years, with the increasing awareness of sun protection and the improvement of living standards, consumers' awareness of protection has also been continuously enhanced, leading to a sustained rise in market demand for sunscreen cosmetics. Di-ethylhexyloxyphenol methoxyphenyl triazine is stable, safe, and non-toxic, with a current demand exceeding 1,000 tons per year. Although the price is relatively high, market demand is bound to increase year by year, indicating a broad prospect for the development of the additives industry. Firstly, with the demand for plastic products maintaining a high growth rate, the plastics industry possesses enormous market potential, and the development of plastic additives, which are closely related to plastic products, is even more rapid. Di-ethylhexyloxyphenol methoxyphenyl triazine, as an important raw material for plastic additives, naturally has a broad market prospect.

[0004] Currently, there are relatively few synthetic routes for bis-ethylhexyloxyphenol methoxyphenyl triazine. Generally, it involves a Grignard reaction followed by reaction with resorcinol, then with chloroisooctane or bromoisooctane, followed by recrystallization, centrifugation, and drying to obtain the product. This process uses a variety of solvents, generates significant wastewater and solid waste. Currently, only BASF is producing it globally, but the price is high and the quality is unstable. This project aims to further develop bis-ethylhexyloxyphenol methoxyphenyl triazine using the company's products, p-bromoanisole, chloroisooctane, or bromoisooctane, as raw materials to obtain a higher value-added product. This product, bis-ethylhexyloxyphenol methoxyphenyl triazine, is mainly used as a sunscreen agent and rubber and plastic additive, with wide applications and a broad market prospect. Therefore, developing a suitable synthetic process to produce high-yield, high-quality bis-ethylhexyloxyphenol methoxyphenyl triazine will have significant industrial implications. Summary of the Invention

[0005] The purpose of this invention is to provide a method for synthesizing bis-ethylhexyloxyphenol methoxyphenyl triazine, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a method for synthesizing bis-ethylhexyloxyphenol methoxyphenyl triazine, comprising the following specific steps: Step 1: Preparation of intermediate I. First, prepare a Grignard solution. Add cyanuric chloride and THF to the reaction vessel, add the prepared Grignard solution dropwise, and after the reaction is completed, cool and filter to obtain intermediate I. Step 2: Preparation of intermediate II, namely, adding zinc chloride into the reaction, adding xylene for dispersion, and then adding intermediate I, resorcinol and xylene solvent dropwise until the reaction is completed, to obtain crude yellow intermediate II; Step 3: Add intermediate II, xylene solvent, acid-binding agent, chloroisooctane and bromoisooctane into the reaction vessel and carry out the reaction to obtain a high-purity product; Step 4: Sample and test the samples from Step 1, Step 2 and Step 3 to optimize the production process of bis-ethylhexyloxyphenol methoxyphenyl triazine.

[0007] Preferably, in step one, the Grignard solution is prepared by reacting magnesium shavings and iodine granules with p-bromoanisole in anhydrous tetrahydrofuran. The reaction ends after the magnesium shavings disappear, yielding a Grignard solution. The Grignard solution is added dropwise to the reaction vessel at low temperature. After the addition of the Grignard solution is complete, the reaction is quenched with hydrochloric acid until the reaction is finished. The mixture is then stirred for 1 hour, cooled, and filtered to obtain crude intermediate I. Crude intermediate I is washed with methanol and then dried to obtain intermediate I. The chemical reaction formula for preparing the Grignard solution is as follows: The chemical reaction formula for the reaction of cyanuric chloride and THF with Grignard solution in the reaction vessel is as follows: The preparation reaction of intermediate I is carried out according to the above formula.

[0008] Preferably, when adding intermediate I, resorcinol and xylene solvent, the dropping temperature is controlled within the range of 0-30°C. After the dropping is completed, the mixed solution is stirred for 4 hours until the reaction is finished. Then, water is added to quench the reaction, and then the xylene is recovered by concentration at atmospheric pressure. Finally, the mixture is filtered while hot to obtain the crude yellow intermediate II.

[0009] Preferably, the chemical reaction formula for the preparation reaction of intermediate II is as follows: .

[0010] Preferably, in step three, when intermediate II, xylene solvent, acid-binding agent, chloroisooctane, and bromoisooctane react in the reactor, the reactor is heated to reflux, plate analysis is performed to the reaction endpoint, and the pH is adjusted to weakly acidic with hydrochloric acid. Then, the xylene solvent is recovered under negative pressure, and water is added for stirring and filtration to obtain the crude product. The crude product is then purified by recrystallization, centrifugation, and drying.

[0011] Preferably, the chemical reaction formula for the reaction of intermediate II, xylene solvent, acid-binding agent, and chloroisooctane in step three is as follows: .

[0012] Preferably, in step four, the sampling and testing in step one involves sampling the prepared Grignard solution and detecting the contents of magnesium shavings, iodine particles, anhydrous tetrahydrofuran, and p-bromoanisole in the Grignard solution. By detecting the contents of magnesium shavings and iodine particles in the Grignard solution, it can be determined whether the ratio and quantity of magnesium shavings and iodine particles added during the preparation of the Grignard solution are reasonable. If only magnesium shavings or iodine particles remain in the Grignard solution, the ratio of magnesium shavings and iodine particles added is unreasonable. If both magnesium shavings and iodine particles remain in the Grignard solution, the amount of magnesium shavings and iodine particles added is excessive. The amount of magnesium shavings and iodine particles added can be reduced according to the reaction environment or the volume of the container. Increase the amount of anhydrous tetrahydrofuran and p-bromoanisole, and take a sample of the filtered solution after the reaction of Grignard solution with cyanuric chloride and THF is complete. Test whether there are any residues of intermediate I, Grignard solution, cyanuric chloride and THF in the filtered solution. If intermediate I is present in the filtered solution, then intermediate I was not completely filtered. Filter the solution again to obtain intermediate I, until there are no residues of intermediate I in the solution. If there are any residues of Grignard solution, cyanuric chloride and THF in the solution, adjust the proportion of Grignard solution, cyanuric chloride and THF added.

[0013] Preferably, in step four, the sampling and testing in step two involves sampling and testing the solution after filtering to obtain intermediate II. If the sample solution contains intermediate II, then intermediate II in the solution has not been completely filtered. The solution is then filtered again to obtain intermediate II until no intermediate II remains in the solution. If the sample solution contains xylene, then xylene in the solution has not been completely recovered. The xylene is then recovered by atmospheric pressure concentration. If the sample solution contains intermediate I and resorcinol residues, the ratio of intermediate I and resorcinol is adjusted.

[0014] Preferably, in step four, the sampling and testing in step three involves sampling the solution from which the crude product is obtained by filtration, and testing the components in the sample solution. If the sample solution contains crude product, the crude product in the solution has not been completely filtered. The solution is then filtered again to obtain the crude product, until no crude product residue remains in the solution. If the sample solution contains intermediate II, xylene solvent, acid-binding agent, and chloroisooctane residue, the proportions of intermediate II, xylene solvent, acid-binding agent, chloroisooctane, and bromoisooctane are adjusted to optimize the production process of bis-ethylhexyloxyphenol methoxyphenyl triazine.

[0015] The technical effects and advantages of this invention are as follows: This invention utilizes a synthesis method for bis-ethylhexyloxyphenol methoxyphenyl triazine, employing p-bromoanisole, chloroisooctane, or bromoisooctane as raw materials, thereby reducing production costs. Xylene is used as a single solvent, avoiding the difficulty in recovering mixed solvents. Anhydrous aluminum chloride or anhydrous zinc chloride is used as a catalyst, and recrystallization technology is employed to improve the purity of the product, thus preparing bis-ethylhexyloxyphenol methoxyphenyl triazine with higher purity. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a flowchart illustrating the synthesis method of bis-ethylhexyloxyphenol methoxyphenyl triazine according to the present invention. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] This invention provides, for example Figure 1 The present invention describes a method for synthesizing bis-ethylhexyloxyphenol methoxyphenyl triazine.

[0019] Example 1: Includes the following specific steps: Step 1: Preparation of intermediate I. First, prepare a Grignard solution. Add cyanuric chloride and THF to the reaction vessel, and add the prepared Grignard solution dropwise. The Grignard solution is stored for later use. After the reaction is completed, cool and filter to obtain intermediate I. Step 2: Preparation of intermediate II, namely, adding zinc chloride to the reaction, adding xylene for dispersion, and then adding intermediate I, resorcinol and xylene solvent dropwise until the reaction is completed, to obtain crude yellow intermediate II. The crude yellow intermediate II will be further processed in the subsequent bis-ethylhexyloxyphenol methoxyphenyl triazine production step, without the need for purification of the crude yellow intermediate II, thereby reducing the workload of producing crude yellow intermediate II. Step 3: Add intermediate II, xylene solvent, acid-binding agent, chloroisooctane and bromoisooctane into the reactor for reaction treatment to obtain a high-purity product. Using xylene as a single solvent avoids the problem of difficult recovery of mixed solvents, reduces the workload of by-product recovery and wastewater treatment, and alleviates environmental pressure. Step 4: Sampling and testing are conducted on steps 1, 2, and 3 to optimize the production process of bis-ethylhexyloxyphenol methoxyphenyl triazine. By sampling and testing steps 1, 2, and 3, the content of residues can be detected. Based on the content of residues, the production materials of bis-ethylhexyloxyphenol methoxyphenyl triazine can be adjusted, thereby improving the utilization efficiency of the production materials of bis-ethylhexyloxyphenol methoxyphenyl triazine and reducing resource waste.

[0020] Further, in step one, the Grignard solution is obtained by reacting magnesium shavings and iodine granules with p-bromoanisole in anhydrous tetrahydrofuran (THF). The reaction ends after the magnesium shavings completely disappear, yielding the Grignard solution. The Grignard solution is added dropwise to the reaction vessel at a low temperature. After the addition is complete, the reaction is allowed to proceed for a certain period, monitored until the reactants disappear, until the reaction is complete. The reaction is then quenched with hydrochloric acid. Dilute hydrochloric acid is used for quenching; excessively high concentrations can lead to intense localized exothermic reactions and violent boiling, while insufficient concentrations result in incomplete quenching. The reaction system is maintained at a low temperature of 0-5°C to maintain the low-temperature condition of the Grignard reaction and prevent the formation of byproducts at high temperatures. The dilute hydrochloric acid is slowly added to the reaction vessel at a rate of 1-2 mL / min, adjusted according to the vessel volume to avoid sudden pH changes that could trigger a violent reaction. The acid is added until the pH reaches 2-3, ensuring complete quenching of the Grignard reagent in an acidic environment. Real-time monitoring with pH test paper or online pH meter is required, and continuous stirring is necessary during quenching to prevent excessive local acidity. If a large number of bubbles appear, the addition should be stopped and the stirring speed reduced. The mixture should be stirred for 1 hour, cooled, and filtered to obtain crude intermediate I. Crude intermediate I is then washed with methanol using anhydrous cold methanol, pre-cooled to 0-5℃ to reduce dissolution loss. 200-500 mL of cold methanol is used per 100 g of crude intermediate I, and the washing is performed in 2-3 batches. The filter cake is transferred to a beaker, soaked in cold methanol for 5-10 minutes, and then filtered. This process is repeated 2-3 times to remove residual hydrochloric acid, unreacted p-bromoanisole, cyanuric chloride, and other water-soluble or methanol-soluble impurities. Avoid vigorous stirring of the filter cake during washing to prevent crystal breakage. The methanol waste liquid after washing should be collected separately and then dried to obtain intermediate I. The chemical reaction formula for the preparation of the Grignard solution is as follows: The chemical reaction formula for the reaction of cyanuric chloride and THF with Grignard solution in a reaction vessel is as follows: The preparation reaction of intermediate I is carried out according to the above formula.

[0021] Furthermore, when adding intermediate I, resorcinol, and xylene solvent, the dropping temperature is controlled within the range of 0–30°C. Maintaining this temperature range reduces byproduct formation, addressing the issues of heterogeneous reactions and numerous byproducts in traditional processes. The zinc chloride catalyst maintains good activity in xylene solvent within this temperature range, while also preventing raw material decomposition or excessive solvent evaporation due to high temperatures. After dropping, the mixed solution is stirred for 4 hours until the reaction is complete. Then, a certain amount of water is added to quench the reaction, followed by atmospheric pressure concentration to recover xylene. During atmospheric pressure concentration, the concentration temperature is 138–140°C, maintained at a gentle boil, and the concentration is increased to 300°C. Stirring at -400 rpm ensures uniform heating of the solution, preventing localized overheating and potential boiling. Concentrate until the reaction volume is approximately one-tenth of the original volume or until a small amount of solid is observed to precipitate. Collect the distilled xylene using a condenser, dry with anhydrous sodium sulfate, and reuse it in subsequent reactions. A reflux condenser must be installed during concentration to prevent xylene volatilization and environmental pollution, avoid over-concentration, and prevent decomposition or agglomeration of intermediate II. The endpoint can be controlled by real-time volume monitoring. Then filter while hot, maintaining the solution temperature at 80-100℃ to prevent loss of intermediate II upon cooling and crystallization, yielding a yellow crude intermediate II. The chemical reaction formula for the preparation of intermediate II is as follows: Furthermore, the recovered xylene needs to be dried before recycling, which reduces production costs and environmental pressure.

[0022] In particular, during the reaction of intermediate II, xylene solvent, acid-binding agent, chloroisooctane, and bromoisooctane in step three, the reaction vessel is heated to reflux. Plate chromatography is used to determine the reaction endpoint, and the pH is adjusted to weakly acidic with hydrochloric acid. Then, the xylene solvent is recovered under negative pressure, and water is added for stirring and filtration to obtain the crude product. The crude product is then purified by recrystallization, centrifugation, and drying. During recrystallization, a mixed solvent of xylene and ethanol is used. The crude product is added to the reaction flask at a ratio of 1g:5-8mL solvent, heated to the xylene reflux temperature, and stirred for 30-60 minutes until the crude product is completely dissolved, forming a saturated solution. 1-3% (by weight of the crude product) of activated carbon is added, and the mixture is refluxed and stirred for another 15-20 minutes to adsorb pigments and impurities. The solution is then preheated to 120℃. Using a Buchner funnel, remove activated carbon and insoluble impurities by vacuum filtration. Collect the filtrate in a clean beaker and allow it to cool naturally to room temperature before transferring it to an ice-water bath and standing for 1-2 hours. Stir slowly to promote uniform crystal precipitation and avoid rapid cooling that could result in overly fine crystals. If the amount of crystals precipitated is small, the filtrate can be concentrated appropriately before cooling. Centrifugation is used to wash the crystals. When drying the crystals, a fluidized bed dryer is used, with the drying temperature controlled between 60-80℃ to avoid product decomposition due to high temperature. The vacuum degree is 0.08-0.1MPa to accelerate solvent evaporation, reduce the risk of oxidation, and prevent product decomposition or moisture absorption. Dry for 4-6 hours. The chemical reaction formula for the reaction of intermediate II, xylene solvent, acid-binding agent, and chloroisooctane in step three is as follows: Furthermore, after product purification, the purity and appearance of the product must be tested by HPLC to ensure the quality of product production. Even if the purity of the product is ≥98.5%, the appearance is a light yellow crystal.

[0023] Example 2: Based on Example 1, step four involves sampling and detecting the prepared Grignard solution to determine the content of magnesium shavings, iodine particles, anhydrous tetrahydrofuran, and p-bromoanisole in the Grignard solution. The magnesium shavings and iodine particles are detected using an electronic balance, burette, XRD diffractometer, 10% hydrochloric acid solution, EDTA standard solution, and Eriochrome Black T indicator. Iodine particles are detected using a burette, UV spectrophotometer, starch solution, and sodium thiosulfate standard solution for colorimetric reaction. p-bromoanisole is detected using GC-MS, high-performance liquid chromatography, infrared spectroscopy, p-bromoanisole standard, methanol, and organic solvents. To determine whether the ratio and quantity of magnesium shavings and iodine granules added during the preparation of the Grignard solution are reasonable, if either magnesium shavings or iodine granules remain in the Grignard solution, the ratio is unreasonable. That is, if magnesium shavings remain, increase the proportion of iodine granules; if iodine granules remain, increase the proportion of magnesium shavings. If both magnesium shavings and iodine granules remain, the amount of magnesium shavings and iodine granules is excessive. Depending on the reaction environment or the volume of the container, the amount of magnesium shavings and iodine granules can be reduced, or the amount of anhydrous tetrahydrofuran and p-bromoanisole can be increased. Furthermore, after the Grignard solution reacts with cyanuric chloride and THF, the filtered solution should be sampled to detect the presence of intermediate I, Grignard solution, cyanuric chloride, and THF residues. The Grignard solution can be prepared using a 1H... The detection methods include NMR spectroscopy, gas chromatography, burettes, saturated ammonium chloride solution, and hydrochloric acid standard solution. Cyanide can be detected using GC-MS, ion chromatography, HPLC, cyanide standard, and silver nitrate solution. Xylene can be detected using gas chromatography, a hydrometer, xylene standard, and anhydrous solvent. If intermediate I remains in the filtered solution, it indicates incomplete filtration. The solution should be filtered again to obtain intermediate I, continuing until no intermediate I remains. If Grignard solution, cyanide, and THF remain in the solution, the Grignard solution should be... The proportions of residual Grignard solution, cyanuric chloride, and THF are adjusted. When Grignard solution residue is present in the solution, the proportion of cyanuric chloride and THF is increased or decreased. When cyanuric chloride residue is present in the solution, the proportion of Grignard solution and cyanuric chloride is increased or decreased. When THF residue is present in the solution, the proportion of Grignard solution and cyanuric chloride is increased or decreased. When all three residues of Grignard solution, cyanuric chloride, and THF are present in the solution, the reaction time of Grignard solution, cyanuric chloride, and THF is increased or the amount of Grignard solution, cyanuric chloride, and THF added is decreased.

[0024] Furthermore, in step four, the sampling and testing in step two involves sampling and testing the solution after filtration to obtain intermediate II. If the sample solution contains intermediate II, then intermediate II in the solution has not been completely filtered. The solution is then filtered again to obtain intermediate II until no intermediate II residue remains in the solution. The detection of intermediates I and II needs to be combined with rapid monitoring, quantitative analysis, structural confirmation, and moisture control to form a complete process quality control system to ensure that the intermediates meet the synthesis requirements. The difference between the two mainly lies in the functional group characteristics, which can be distinguished through targeted spectral analysis. The difference in adsorption-desorption equilibrium between intermediates I and II in the stationary and mobile phases leads to different migration distances of different components. By comparing with the standard, Rf The value can determine the presence and completeness of intermediates I and II, thus enabling the detection of intermediates I and II. When xylene is present in the sample solution, the xylene in the solution has not been completely recovered, and the xylene is recovered again by atmospheric pressure concentration. When the sample solution contains residues of intermediate I and resorcinol, the ratio of intermediate I to resorcinol is adjusted. That is, when the sample solution has residues of intermediate I, the ratio of resorcinol is increased or decreased; when the sample solution has residues of resorcinol, the ratio of intermediate I is increased or decreased; when the sample solution has residues of both intermediate I and resorcinol, the reaction time is increased or the amount of intermediate I and resorcinol is decreased.

[0025] Furthermore, in step four, the sampling and testing of the crude product obtained in step three involves sampling the solution obtained by filtration and analyzing the components in the sample solution. If the sample solution contains crude product, it means that the crude product in the solution has not been completely filtered out. The solution is then filtered again to obtain the crude product until no crude product residue remains in the solution. The crude product is then purified by recrystallization, centrifugation, and drying. When testing the bis-ethylhexyloxyphenol methoxyphenyl triazine product, high-performance liquid chromatography (HPLC) is used, i.e., the external standard method. The phenol methoxyphenyl triazine product with a content of over 98.5% is considered a qualified product. When the sample solution contains intermediate II, xylene solvent, acid-binding agent, and chloroisooctane residue, the proportions of intermediate II, xylene solvent, acid-binding agent, and chloroisooctane are adjusted to optimize the production process of bis-ethylhexyloxyphenol methoxyphenyl triazine, thereby improving the production efficiency of bis-ethylhexyloxyphenol methoxyphenyl triazine, reducing the production cost of bis-ethylhexyloxyphenol methoxyphenyl triazine, and achieving the goal of cost reduction and efficiency improvement.

[0026] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for synthesizing bis-ethylhexyloxyphenol methoxyphenyl triazine, characterized in that: The specific steps include the following: Step 1: Preparation of intermediate I. First, prepare a Grignard solution. Add cyanuric chloride and THF to the reaction vessel, add the prepared Grignard solution dropwise, and after the reaction is completed, cool and filter to obtain intermediate I. Step 2: Preparation of intermediate II, namely, adding zinc chloride into the reaction, adding xylene for dispersion, and then adding intermediate I, resorcinol and xylene solvent dropwise until the reaction is completed, to obtain crude yellow intermediate II; Step 3: Add intermediate II, xylene solvent, acid-binding agent, chloroisooctane and bromoisooctane into the reaction vessel and carry out the reaction to obtain a high-purity product; Step 4: Sample and test the samples from Step 1, Step 2 and Step 3 to optimize the production process of bis-ethylhexyloxyphenol methoxyphenyl triazine.

2. The method for synthesizing bis-ethylhexyloxyphenol methoxyphenyl triazine according to claim 1, characterized in that: In step one, the Grignard solution is prepared by reacting magnesium shavings and iodine granules with p-bromoanisole in anhydrous tetrahydrofuran. The reaction ends after the magnesium shavings disappear, yielding a Grignard solution. The Grignard solution is added dropwise to the reaction vessel at a low temperature. After the Grignard solution is added, the reaction is quenched with hydrochloric acid until the reaction is complete. The mixture is then stirred for 1 hour, cooled, and filtered to obtain crude intermediate I. Crude intermediate I is washed with methanol and then dried to obtain intermediate I.

3. The method for synthesizing bis-ethylhexyloxyphenol methoxyphenyl triazine according to claim 2, characterized in that: The chemical reaction formula for preparing the Grignard solution is as follows: The chemical reaction formula for the reaction of cyanuric chloride and THF with Grignard solution in the reaction vessel is as follows: The preparation reaction of intermediate I is carried out according to the above formula.

4. The method for synthesizing bis-ethylhexyloxyphenol methoxyphenyl triazine according to claim 3, characterized in that: When adding intermediate I, resorcinol and xylene solvent, the dropping temperature is controlled within the range of 0-30℃. After the dropping is completed, the mixed solution is stirred for 4 hours until the reaction is finished. Then, water is added to quench the reaction, and then the xylene is recovered by concentration at normal pressure. Then, the mixture is filtered while hot to obtain the crude yellow intermediate II.

5. The method for synthesizing bis-ethylhexyloxyphenol methoxyphenyl triazine according to claim 4, characterized in that: The chemical reaction formula for the preparation reaction of intermediate II is as follows: 。 6. The method for synthesizing bis-ethylhexyloxyphenol methoxyphenyl triazine according to claim 5, characterized in that: In step three, when intermediate II, xylene solvent, acid-binding agent, chloroisooctane, and bromoisooctane react in the reactor, the reactor is heated to reflux, and plate analysis is performed until the reaction endpoint is reached. The pH is adjusted to weakly acidic with hydrochloric acid, and then the xylene solvent is recovered under negative pressure. Water is then added, stirred, and filtered to obtain the crude product. The crude product is then purified by recrystallization, centrifugation, and drying.

7. The method for synthesizing bis-ethylhexyloxyphenol methoxyphenyl triazine according to claim 6, characterized in that: The chemical reaction formula for the reaction of intermediate II, xylene solvent, acid-binding agent, and chloroisooctane in step three is as follows: 。 8. The method for synthesizing bis-ethylhexyloxyphenol methoxyphenyl triazine according to claim 7, characterized in that: Step four involves sampling and testing the prepared Grignard solution to detect the content of magnesium shavings, iodine particles, anhydrous tetrahydrofuran, and p-bromoanisole. By detecting the content of magnesium shavings and iodine particles in the Grignard solution, it can be determined whether the ratio and quantity of magnesium shavings and iodine particles added during the preparation of the Grignard solution are reasonable. If only magnesium shavings or iodine particles remain in the Grignard solution, the ratio of magnesium shavings and iodine particles added is unreasonable. If both magnesium shavings and iodine particles remain in the Grignard solution, the amount of magnesium shavings and iodine particles added is excessive. The amount of magnesium shavings and iodine particles added can be reduced according to the reaction environment or the available volume. Alternatively, increase the amounts of anhydrous tetrahydrofuran and p-bromoanisole, and take a sample of the filtered solution after the reaction of Grignard solution with cyanuric chloride and THF is complete. Test the filtered solution for any residues of intermediate I, Grignard solution, cyanuric chloride, and THF. If intermediate I is present in the filtered solution, then intermediate I was not completely filtered. Filter the solution again to obtain intermediate I, until no intermediate I remains in the solution. If Grignard solution, cyanuric chloride, and THF remain in the solution, adjust the proportions of these residues.

9. The method for synthesizing bis-ethylhexyloxyphenol methoxyphenyl triazine according to claim 8, characterized in that: In step four, the sampling and testing in step two involves sampling and testing the solution after obtaining intermediate II through filtration. If the sample solution contains intermediate II, then intermediate II in the solution has not been completely filtered. The solution is then filtered again to obtain intermediate II until no intermediate II remains in the solution. If the sample solution contains xylene, then xylene in the solution has not been completely recovered. The xylene is then recovered by atmospheric pressure concentration. If the sample solution contains intermediate I and resorcinol residues, the ratio of intermediate I and resorcinol is adjusted.

10. The method for synthesizing bis-ethylhexyloxyphenol methoxyphenyl triazine according to claim 9, characterized in that: In step four, the sampling and testing in step three involves sampling the solution from which the crude product is obtained through filtration and testing the components in the sample solution. If the sample solution contains crude product, it means that the crude product in the solution has not been completely filtered. The solution is then filtered again to obtain the crude product until no crude product residue remains in the solution. If the sample solution contains intermediate II, xylene solvent, acid-binding agent, and chloroisooctane residue, the proportions of intermediate II, xylene solvent, acid-binding agent, chloroisooctane, and bromoisooctane are adjusted to optimize the production process of bis-ethylhexyloxyphenol methoxyphenyl triazine.

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