Method for preparing epoxy trimethoxy silane by one-pot method
A one-pot method for preparing epoxytrimethoxysilanes was developed, using chloroplatinic acid and a complex to prepare the main catalyst, and introducing an amine co-catalyst. This solved the problem of difficult reaction control in the dropwise preparation method, and enabled efficient and low-energy production of the product.
Patent Information
- Application Number
- CN202511550200.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-28
- Publication Date
- 2026-01-16
AI Technical Summary
In the existing technology, the dropwise addition method in the preparation of epoxytrimethoxysilane makes the reaction difficult to control, causes intense exothermic reaction, and affects the purity and yield of the product.
A one-pot method was used to prepare epoxytrimethoxysilane. The main catalyst was prepared by complexing chloroplatinic acid with complex A and complex B. An amine co-catalyst was introduced to reduce the heat of reaction and promote a stable reaction.
This approach ensures a stable reaction, improves raw material conversion rate and product quality, reduces heat source consumption, simplifies the operation process, and enhances product purity.
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Abstract
Description
Technical Field
[0001] This invention relates to the field of organosilane preparation technology, and in particular to a one-pot method for preparing epoxytrimethoxysilanes by hydrosilylation. Background Technology
[0002] Silane coupling agent KH-560, also known as γ-(2,3-epoxypropoxy)propyltrimethoxysilane or epoxytrimethoxysilane, is widely used in various fields. For example, in the field of composite materials, it can effectively improve the mechanical properties of carbon fiber resin-based composites, basalt fiber / epoxy resin composites, and other composite materials. In the field of coatings, it can effectively improve the thermal storage stability and corrosion resistance of inorganic coatings. In the field of adhesives, it can effectively improve the tensile shear strength and bond strength of adhesives.
[0003] The preparation of epoxytrimethoxysilanes generally involves the direct hydrosilylation of trimethoxysilane (TMS) with allyl glycidyl ether (AGE) under the action of a catalyst. This process is relatively mature and stable; however, the main catalysts and additives used by different companies vary significantly. The main catalysts typically use precious metals such as rhodium, ruthenium, or platinum, and the additives also differ. The crude product content is generally around 80%. Currently, intermittent dropping is often used for feeding. Because hydrosilylation is highly exothermic, the rate of dropping significantly affects the exothermic reaction. Too fast a reaction is difficult to control, while too slow a reaction can lead to side reactions that affect product purity and yield. Therefore, a new preparation method needs to be developed. Summary of the Invention
[0004] To address the aforementioned technical problems, this invention provides a one-pot method for preparing epoxytrimethoxysilanes, which introduces amine co-catalysts as inhibitors to reduce the exothermic reaction and promote a stable reaction process. The one-pot reaction can reduce the probability of AGE isomerization during the dropwise addition process and further improve the conversion rate of raw materials.
[0005] To achieve this technical objective, the present invention adopts the following solution: A one-pot method for preparing epoxytrimethoxysilanes includes the following steps: S1. The main catalyst was prepared by complexing chloroplatinic acid with complex A and complex B. S2. Trimethoxysilane, allyl glycidyl ether, methanol, main catalyst and co-catalyst are added to the reactor at one time. The temperature is raised to the reaction initiation temperature and then the heating is turned off. The reaction is exothermic and the system temperature is maintained. S3. After the reaction is complete, the crude product is subjected to negative pressure distillation to obtain the epoxytrimethoxysilane product.
[0006] Further, in step S1, the preparation method of the main catalyst is as follows: chloroplatinic acid is dissolved in isopropanol and poured into a reaction vessel, heated to 40~50℃, complex A and complex B are added, the temperature is raised to 70~100℃, and the mixture is stirred and refluxed for 2~6 hours. Part of the isopropanol and water are removed under vacuum to obtain a pale yellow transparent main catalyst.
[0007] Furthermore, the mass ratio of chloroplatinic acid, complex A, and complex B is 1:20~30:2~5; the volume ratio of chloroplatinic acid to isopropanol is 1g:20~30mL.
[0008] Furthermore, complex A is selected from one of 2,4-pentanedione, ethyl acetate, butyl acetate, and methyl ethyl ketone; complex B is selected from one of butyraldehyde, isobutyraldehyde, pentaldehyde, glyoxal, malondialdehyde, glutaraldehyde, benzaldehyde, p-hydroxybenzaldehyde, p-methylbenzaldehyde, p-methoxybenzaldehyde, and p-tert-butylbenzaldehyde.
[0009] Furthermore, the Pt content in the main catalyst is 200~500 ppm.
[0010] Furthermore, the catalyst is composed of a first additive and a second additive, with a volume ratio of 1 to 4:1.
[0011] Furthermore, the first adjuvant is selected from one of triethylamine, p-phenylenediamine, imidazole, carbazole, aniline, triethanolamine, triisopropanolamine, and phenothiazine; the second adjuvant is selected from one of ethyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl acrylate, and ethylene glycol dimethyl ether.
[0012] Further, in step S2, the molar ratio of trimethoxysilane, allyl glycidyl ether, and methanol is 0.5~0.6:0.6~0.7:0.3~0.4; based on the total amount of raw and auxiliary materials input, the amount of main catalyst added is 0.5~2‰, and the amount of co-catalyst added is 0.5~1‰.
[0013] Furthermore, in step S2, the reaction temperature is 40~90℃ and the pressure is 0~0.3MPa.
[0014] Furthermore, in step S3, the content of epoxytrimethoxysilane in the crude product is >85.5%.
[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. One-time feeding can further shorten the production time per batch, is easy to operate, and saves labor; 2. One-pot reaction: the reaction is exothermic and the raw materials have basically all reacted. No need for subsequent heat preservation. This reduces heat consumption while shortening the working time. 3. Introduce amine-containing co-catalysts as inhibitors to reduce the heat of reaction and promote a stable reaction process; 4. One-pot reaction helps reduce the risk of AGEs and product isomerization, thereby improving raw material conversion rate and product quality; the number of product isomers in the crude product is reduced, making it easier to produce high-purity products. Detailed Implementation
[0016] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments.
[0017] This invention provides a one-pot method for preparing epoxytrimethoxysilanes, comprising the following steps: S1. The main catalyst was prepared by complexation reaction of chloroplatinic acid with complex A and complex B. The Pt content in the main catalyst was 200-500 ppm.
[0018] The preparation method of the main catalyst is as follows: chloroplatinic acid is dissolved in isopropanol and poured into a reaction vessel, heated to 40~50℃, complex A and complex B are added, the temperature is raised to 70~100℃, and the mixture is stirred and refluxed for 2~6 hours. Part of the isopropanol and water are removed under vacuum to obtain a light yellow transparent main catalyst.
[0019] The mass ratio of chloroplatinic acid, complex A, and complex B is 1:20~30:2~5; the volume ratio of chloroplatinic acid to isopropanol is 1g:20~30mL.
[0020] Complex A is selected from one of 2,4-pentanedione, ethyl acetate, butyl acetate, and methyl ethyl ketone.
[0021] Complex B is selected from one of butyraldehyde, isobutyraldehyde, pentaldehyde, glyoxal, malondialdehyde, glutaraldehyde, benzaldehyde, p-hydroxybenzaldehyde, p-methylbenzaldehyde, p-methoxybenzaldehyde, and p-tert-butylbenzaldehyde.
[0022] S2. Trimethoxysilane, allyl glycidyl ether, methanol, main catalyst, and co-catalyst are added to the reactor in one step. The temperature is raised to the reaction initiation temperature, and then the heating is turned off. The reaction is exothermic, and the system temperature is maintained. The reaction temperature is 40~90℃, and the pressure is 0~0.3MPa.
[0023] The catalyst is composed of a first additive and a second additive, with a volume ratio of 1 to 4:1.
[0024] The first adjuvant is selected from one of triethylamine, p-phenylenediamine, imidazole, carbazole, aniline, triethanolamine, triisopropanolamine, and phenothiazine.
[0025] The second adjuvant is selected from one of ethyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl acrylate, and ethylene glycol dimethyl ether.
[0026] The molar ratio of trimethoxysilane, allyl glycidyl ether, and methanol is 0.5~0.6:0.6~0.7:0.3~0.4; based on the total amount of raw and auxiliary materials input, the amount of main catalyst added is 0.5~2‰, and the amount of co-catalyst added is 0.5~1‰.
[0027] S3. After the reaction is complete (from the initiation of the reaction to the reaction endpoint, the reaction temperature continues to rise, and the reaction is considered complete when the temperature begins to decrease), the crude product is subjected to negative pressure distillation to obtain the epoxytrimethoxysilane product. The content of epoxytrimethoxysilane in the crude product is >85.5%, and after removing the methanol peak, the content of epoxytrimethoxysilane is >90%; the content of epoxytrimethoxysilane in the product is >99.5%. Example 1
[0028] S1. Dissolve 1g of chloroplatinic acid (H2PtCl·6H2O) in 20mL of isopropanol and pour it into a reaction vessel (equipped with a stirrer, thermometer, reflux condenser and water bath heating device). Heat to 40℃, add 20g of 2,4-pentanedione and 2g of isobutyraldehyde, heat to 70℃, stir and reflux for 2h. Use a water ring vacuum pump to remove some isopropanol and water to obtain 20mL of pale yellow transparent main catalyst.
[0029] S2. Add 73.5g trimethoxysilane (TMS), 76g allyl glycidyl ether (AGE), 12g methanol, 160μL main catalyst (calculated based on the total amount of raw materials and auxiliary materials added, with a platinum content of 20ppm), 100μL triethylamine, and 100μL ethyl formate to the reactor at once. Heat to 40℃ and then turn off the heating. Maintain the system temperature by keeping the reaction exothermic. The pressure is 0.1MPa.
[0030] S3. After the reaction is complete, the crude product is subjected to negative pressure distillation to obtain the epoxytrimethoxysilane product. Example 2
[0031] S1. Dissolve 1g of chloroplatinic acid (H2PtCl·6H2O) in 30mL of isopropanol and pour it into a reaction vessel (equipped with a stirrer, thermometer, reflux condenser and water bath heating device). Heat to 50℃, add 30g of 2,4-pentanedione and 5g of isobutyraldehyde, heat to 100℃, stir and reflux for 6h. Use a water ring vacuum pump to remove some isopropanol and water to obtain 40mL of pale yellow transparent main catalyst.
[0032] S2. Add 74g trimethoxysilane (TMS), 76g allyl glycidyl ether (AGE), 12g methanol, 160μL main catalyst (calculated based on the total amount of raw materials and auxiliary materials added, with a platinum content of 20ppm), 100μL p-phenylenediamine, and 100μL ethyl formate to the reactor at once. Heat to 90℃ and then turn off the heating. Maintain the system temperature by keeping the reaction exothermic. The pressure is 0.3MPa.
[0033] S3. After the reaction is complete, the crude product is subjected to negative pressure distillation to obtain the epoxytrimethoxysilane product. Example 3
[0034] S1. Dissolve 1g of chloroplatinic acid (H2PtCl·6H2O) in 30mL of isopropanol and pour it into a reaction vessel (equipped with a stirrer, thermometer, reflux condenser and water bath heating device). Heat to 50℃, add 30g of ethyl acetate and 5g of pentanal, heat to 100℃, stir and reflux for 6h. Use a water ring vacuum pump to remove part of the isopropanol and water to obtain 40mL of pale yellow transparent main catalyst.
[0035] S2. Add 75g trimethoxysilane (TMS), 76g allyl glycidyl ether (AGE), 12g methanol, 200μL main catalyst (calculated based on the total amount of raw materials and auxiliary materials added, with a platinum content of 20ppm), 200μL imidazole, and 200μL methyl acetate to the reactor at once. Heat to 90℃ and then turn off the heating. Maintain the system temperature by keeping the reaction exothermic, and the pressure is 0.2MPa.
[0036] S3. After the reaction is complete, the crude product is subjected to negative pressure distillation to obtain the epoxytrimethoxysilane product. Example 4
[0037] S1. Dissolve 1g of chloroplatinic acid (H2PtCl·6H2O) in 30mL of isopropanol and pour it into a reaction vessel (equipped with a stirrer, thermometer, reflux condenser and water bath heating device). Heat to 50℃, add 30g of butyl acetate and 5g of glyoxal, heat to 100℃, stir and reflux for 6h. Use a water ring vacuum pump to remove part of the isopropanol and water to obtain 40mL of pale yellow transparent main catalyst.
[0038] S2. Add 76g of trimethoxysilane (TMS), 76g of allyl glycidyl ether (AGE), 12g of methanol, 200μL of main catalyst (calculated based on the total amount of raw materials and auxiliary materials added, with a platinum content of 20ppm), 300μL of imidazole, and 100μL of ethyl acetate to the reactor at once. After heating to 90℃, turn off the heating. The reaction is exothermic, and the system temperature is maintained at a pressure of 0.2MPa.
[0039] S3. After the reaction is complete, the crude product is subjected to negative pressure distillation to obtain the epoxytrimethoxysilane product. Example 5
[0040] S1. Dissolve 1g of chloroplatinic acid (H2PtCl·6H2O) in 30mL of isopropanol and pour it into a reaction vessel (equipped with a stirrer, thermometer, reflux condenser and water bath heating device). Heat to 50℃, add 30g of methyl ethyl ketone and 5g of malondialdehyde, heat to 100℃, stir and reflux for 6h. Use a water ring vacuum pump to remove part of the isopropanol and water to obtain 40mL of pale yellow transparent main catalyst.
[0041] S2. Add 77g trimethoxysilane (TMS), 76g allyl glycidyl ether (AGE), 12g methanol, 200μL main catalyst (calculated based on the total amount of raw materials and auxiliary materials added, with a platinum content of 20ppm), 400μL carbazole, and 100μL propyl acetate to the reactor at once. After heating to 90℃, turn off the heating. The reaction is exothermic, and the system temperature is maintained at a pressure of 0.2MPa.
[0042] S3. After the reaction is complete, the crude product is subjected to negative pressure distillation to obtain the epoxytrimethoxysilane product. Example 6
[0043] S1. Dissolve 1g of chloroplatinic acid (H2PtCl·6H2O) in 30mL of isopropanol and pour it into a reaction vessel (equipped with a stirrer, thermometer, reflux condenser and water bath heating device). Heat to 50℃, add 30g of 2,4-pentanedione and 5g of benzaldehyde, heat to 100℃, stir and reflux for 6h. Use a water ring vacuum pump to remove part of the isopropanol and water to obtain 40mL of pale yellow transparent main catalyst.
[0044] S2. Add 76g of trimethoxysilane (TMS), 76g of allyl glycidyl ether (AGE), 12g of methanol, 200μL of main catalyst (calculated based on the total amount of raw materials and auxiliary materials added, with a platinum content of 20ppm), 200μL of triethanolamine, and 100μL of methyl propionate to the reactor at once. Heat to 90℃ and then turn off the heating. Maintain the system temperature by keeping the reaction exothermic, and the pressure is 0.2MPa.
[0045] S3. After the reaction is complete, the crude product is subjected to negative pressure distillation to obtain the epoxytrimethoxysilane product. Example 7
[0046] S1. Dissolve 1g of chloroplatinic acid (H2PtCl·6H2O) in 30mL of isopropanol and pour it into a reaction vessel (equipped with a stirrer, thermometer, reflux condenser and water bath heating device). Heat to 50℃, add 30g of 2,4-pentanedione and 5g of p-hydroxybenzaldehyde, heat to 100℃, stir and reflux for 6h. Use a water ring vacuum pump to remove part of the isopropanol and water to obtain 40mL of pale yellow transparent main catalyst.
[0047] S2. Add 72.5g trimethoxysilane (TMS), 76g allyl glycidyl ether (AGE), 12g methanol, 160μL main catalyst (calculated based on the total amount of raw materials and auxiliary materials added, with a platinum content of 20ppm), 100μL aniline, and 100μL ethyl propionate to the reactor at once. Heat to 90℃ and then turn off the heating. Maintain the system temperature by keeping the reaction exothermic, and the pressure is 0.2MPa.
[0048] S3. After the reaction is complete, the crude product is subjected to negative pressure distillation to obtain the epoxytrimethoxysilane product. Example 8
[0049] S1. Dissolve 1g of chloroplatinic acid (H2PtCl·6H2O) in 30mL of isopropanol and pour it into a reaction vessel (equipped with a stirrer, thermometer, reflux condenser and water bath heating device). Heat to 50℃, add 30g of 2,4-pentanedione and 5g of p-methylbenzaldehyde, heat to 100℃, stir and reflux for 6h. Use a water ring vacuum pump to remove part of the isopropanol and water to obtain 40mL of pale yellow transparent main catalyst.
[0050] S2. Add 72.5g trimethoxysilane (TMS), 76g allyl glycidyl ether (AGE), 12g methanol, 160μL main catalyst (calculated based on the total amount of raw materials and auxiliary materials added, with a platinum content of 20ppm), 100μL triisopropanolamine, and 100μL propyl propionate to the reactor at once. Heat to 90℃ and then turn off the heating. Maintain the system temperature by keeping the reaction exothermic. The pressure is 0.2MPa.
[0051] S3. After the reaction is complete, the crude product is subjected to negative pressure distillation to obtain the epoxytrimethoxysilane product. Example 9
[0052] S1. Dissolve 1g of chloroplatinic acid (H2PtCl·6H2O) in 30mL of isopropanol and pour it into a reaction vessel (equipped with a stirrer, thermometer, reflux condenser and water bath heating device). Heat to 50℃, add 30g of 2,4-pentanedione and 5g of p-tert-butylbenzaldehyde, heat to 100℃, stir and reflux for 6h. Use a water ring vacuum pump to remove part of the isopropanol and water to obtain 40mL of pale yellow transparent main catalyst.
[0053] S2. Add 74g trimethoxysilane (TMS), 76g allyl glycidyl ether (AGE), 12g methanol, 160μL main catalyst (calculated based on the total amount of raw materials and auxiliary materials added, with a platinum content of 20ppm), 100μL phenthiazide, and 100μL methyl acrylate to the reactor at once. Heat to 90℃ and then turn off the heating. Maintain the system temperature by keeping the reaction exothermic, and the pressure is 0.2MPa.
[0054] S3. After the reaction is complete, the crude product is subjected to negative pressure distillation to obtain the epoxytrimethoxysilane product. Example 10
[0055] Compared with Example 1, the difference is that 380g of trimethoxysilane (TMS), 380g of allyl glycidyl ether (AGE), 60g of methanol, 1000μL of main catalyst (calculated based on the total amount of raw materials and auxiliary materials added, with a platinum content of 20ppm), 1200μL of triethylamine, and 500μL of ethyl formate were added to the reactor at one time. Example 11
[0056] Compared with Example 2, the difference is that 380g of trimethoxysilane (TMS), 380g of allyl glycidyl ether (AGE), 60g of methanol, 1000μL of main catalyst (calculated based on the total amount of raw materials and auxiliary materials, with a platinum content of 20ppm), 1000μL of p-phenylenediamine, and 500μL of ethyl formate were added to the reactor at one time. Example 12
[0057] Compared with Example 3, the difference is that 380g of trimethoxysilane (TMS), 380g of allyl glycidyl ether (AGE), 60g of methanol, 1000μL of main catalyst (calculated based on the total amount of raw materials and auxiliary materials added, with a platinum content of 20ppm), 1000μL of imidazole and 500μL of methyl acetate were added to the reactor at one time. Example 13
[0058] Compared with Example 4, the difference is that 363g of trimethoxysilane (TMS), 380g of allyl glycidyl ether (AGE), 60g of methanol, 680μL of main catalyst (calculated based on the total amount of raw materials and auxiliary materials added, with a platinum content of 20ppm), 500μL of imidazole, and 500μL of ethyl acetate were added to the reactor at one time. Example 14
[0059] Compared with Example 5, the difference is that 580g of trimethoxysilane (TMS), 608g of allyl glycidyl ether (AGE), 96g of methanol, 1000μL of main catalyst (calculated based on the total amount of raw materials and auxiliary materials, with a platinum content of 20ppm), 800μL of carbazole, and 800μL of propyl acetate were added to the reactor all at once. Example 15
[0060] Compared with Example 6, the difference is that 725g of trimethoxysilane (TMS), 760g of allyl glycidyl ether (AGE), 120g of methanol, 1300μL of main catalyst (calculated based on the total amount of raw materials and auxiliary materials, with a platinum content of 20ppm), 1000μL of triethanolamine, and 1000μL of methyl propionate were added to the reactor all at once. Comparative Example 1 (only the first adjuvant was added)
[0061] Compared with Example 2, the difference is that 74g of trimethoxysilane (TMS), 76g of allyl glycidyl ether (AGE), 12g of methanol, 160μL of main catalyst (calculated based on the total amount of raw materials and auxiliary materials added, with a platinum content of 20ppm) and 200μL of p-phenylenediamine were added to the reactor at one time. Comparative Example 2 (with only the second adjuvant added)
[0062] Compared with Example 2, the difference is that 74g of trimethoxysilane (TMS), 76g of allyl glycidyl ether (AGE), 12g of methanol, 160μL of main catalyst (calculated based on the total amount of raw materials and auxiliary materials added, with a platinum content of 20ppm) and 200μL of ethyl formate were added to the reactor at one time. Comparative Example 3 (Original Process)
[0063] Add 43.5g of allyl glycidyl ether (AGE) and 6.87g of methanol to the reactor, heat to 50°C, add 21μL of catalyst (Castel catalyst, calculated based on the total amount of raw materials and auxiliary materials added, with a platinum content of 5ppm), and then start adding trimethoxysilane (TMS) dropwise. The amount of TMS added is 41.2g. The dropwise addition time for one batch is about 2 hours, and the temperature is maintained for 1 hour to ensure complete reaction. Comparative Example 4 (Original Process)
[0064] Add 57g of allyl glycidyl ether (AGE) and 9g of methanol to the reactor, heat to 55°C, add 80μL of catalyst (Castel catalyst, calculated based on the total amount of raw materials and auxiliary materials added, with a platinum content of 25ppm), and then start adding trimethoxysilane (TMS) dropwise. The amount of TMS added is 54g. The dropwise addition time for one batch is about 2 hours, and the temperature is maintained for 1 hour to ensure complete reaction. Comparative Example 5 (Original process with additives)
[0065] Add 57g of allyl glycidyl ether (AGE) and 9g of methanol to the reactor, heat to 55°C, add 80μL of catalyst (Castel catalyst, calculated based on the total amount of raw materials and auxiliary materials, with a platinum content of 25ppm) and 30μL of auxiliary agent (acetylacetone), and then start adding trimethoxysilane (TMS) dropwise. The amount of TMS added is 54g. The dropwise addition time for one batch is about 2 hours, and the temperature is maintained for 1 hour to ensure complete reaction.
[0066] The crude products obtained from the aforementioned embodiments and comparative examples were analyzed, and the results are shown in Table 1.
[0067] Table 1 Content of each component in the crude product
[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; if these modifications and variations fall within the scope of the claims of the present invention and their equivalents, they should all be considered to be within the protection scope of the present invention.
Claims
1. A method for the one-pot preparation of an epoxytrimethoxysilane, characterized in that, The method comprises the following steps: S1, preparing a main catalyst by complexing chloroplatinic acid with complex A and complex B; S2, adding trimethoxysilane, allyl glycidyl ether, methanol, the main catalyst and a cocatalyst into a reaction kettle at one time, heating to a reaction initiation temperature, then closing the heating, and maintaining the system temperature through reaction heat; S3, after the reaction, performing negative pressure rectification on the reaction crude product to obtain an epoxytrimethoxysilane product.
2. The process for one-pot preparation of epoxide trimethoxysilane according to claim 1, characterized in that, In step S1, the main catalyst is prepared by the following method: dissolving chloroplatinic acid in isopropanol and pouring into a reaction kettle, heating to 40-50 DEG C, adding complex A and complex B, heating to 70-100 DEG C, stirring and refluxing for 2-6 h, and vacuumizing part of isopropanol and water to obtain a light yellow transparent main catalyst.
3. The method of claim 2, wherein the method is characterized by, The mass ratio of chloroplatinic acid, complex A and complex B is 1:20-30:2-5; and the ratio of the amount of chloroplatinic acid to isopropanol is 1 g:20-30 mL.
4. The method of claim 1, wherein the one-pot preparation of epoxymethyltrimethoxysilane is characterized by, Complex A is selected from one of 2,4-pentanedione, ethyl acetate, butyl acetate and methyl ethyl ketone; and complex B is selected from one of butyl aldehyde, isobutyl aldehyde, pentanal, glyoxal, propanedial, pentanedial, benzaldehyde, p-hydroxybenzaldehyde, p-methylbenzaldehyde, p-methoxybenzaldehyde and p-tert-butylbenzaldehyde.
5. The method of claim 1, wherein the one-pot preparation of epoxytrimethoxysilane is characterized by, The content of Pt in the main catalyst is 200-500 ppm.
6. The method of claim 1, wherein the one-pot preparation of epoxymethyltrimethoxysilane is characterized by, The cocatalyst is composed of a first assistant and a second assistant, and the volume ratio of the first assistant to the second assistant is 1-4:
1.
7. The method of one-pot preparation of epoxide trimethoxysilane according to claim 6, characterized in that, The first assistant is selected from one of triethylamine, p-phenylenediamine, imidazole, carbazole, aniline, triethanolamine, triisopropanolamine and phenothiazine; and the second assistant is selected from one of ethyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl acrylate and ethylene glycol dimethyl ether.
8. The method of claim 1, wherein the one-pot preparation of epoxymethyltrimethoxysilane is characterized by, In step S2, the molar ratio of trimethoxysilane, allyl glycidyl ether and methanol is 0.5-0.6:0.6-0.7:0.3-0.4; and the addition amount of the main catalyst is 0.5-2 ‰ and the addition amount of the cocatalyst is 0.5-1 ‰ based on the total amount of raw materials and auxiliaries.
9. The method of claim 1, wherein the one-pot preparation of epoxymethyltrimethoxysilane is characterized by, In step S2, the reaction temperature is 40-90 DEG C and the pressure is 0-0.3 MPa.
10. The method of claim 1, wherein the one-pot preparation of epoxymethyltrimethoxysilane is characterized by, In step S3, the content of epoxytrimethoxysilane in the reaction crude product is >85.5%.