A brominated epoxy resin, an environmentally friendly brominated epoxy resin formula and a preparation method thereof

Abstract

The present application relates to the field of epoxy resins and specifically discloses a brominated epoxy resin, an environmentally friendly brominated epoxy resin formula, and a preparation method thereof. The brominated epoxy resin formula comprises: 100 parts of brominated epoxy resin, 5-10 parts of nano-toughened epoxy resin, 5-10 parts of o-cresol epoxy resin, 10-30 parts of curing agent, 0.1-1 parts of curing agent accelerator, 15-20 parts of dimethyl sulfoxide, 5-10 parts of silicon micropowder, and 30-50 parts of filler; wherein the preparation method of the brominated epoxy resin comprises: heating and mixing brominated epoxy resin oligomer, tetrabromobisphenol A, and tribromophenol at 140-160°C, adding a composite catalyst, and prepolymerizing under microwave conditions to obtain a brominated epoxy resin prepolymer; and mixing the brominated epoxy resin prepolymer with a single catalyst and polymerizing under microwave conditions to obtain the brominated epoxy resin. The epoxy resin formula provided in the present application has excellent mechanical strength and electrical insulation after curing.

Description

Technical Field

[0001] The present application relates to the technical field of epoxy resins, and more specifically, to a brominated epoxy resin, an environmentally friendly brominated epoxy resin formula, and a preparation method thereof. Background Art

[0002] With society's growing emphasis on environmental protection and the deepening of the concept of sustainable development, the research and development and application of environmentally friendly materials have become important issues in the chemical industry. Epoxy resin, as an important polymer material, has been widely used in electronics, coatings, composite materials, and other fields due to its excellent mechanical properties, electrical insulation, and adhesion. However, traditional epoxy resins have poor flame retardancy, and to improve their flame retardancy, bromine-containing compounds are usually added. Brominated epoxy resins have been widely used in engineering plastic modification materials due to their excellent thermal stability, heat aging resistance, processing properties, and especially excellent UV resistance.

[0003] However, existing brominated epoxy resins present several challenges. For example, the use of tetrabromobisphenol A in traditional preparation methods is controversial, and its residual content is difficult to control, potentially leading to environmental pollution and health risks. Furthermore, the molecular weight distribution of existing brominated epoxy resins is broad, making precise control difficult and resulting in unstable performance. For example, low-molecular-weight brominated epoxy resins, while exhibiting good adhesion and flame retardancy, suffer from poor stability and mechanical properties at high temperatures.

[0004] To address these issues, researchers are working to develop environmentally friendly brominated epoxy resin formulations. First, by improving the production process, they are reducing the residual content of tetrabromobisphenol A to meet international environmental standards. Second, by optimizing the formulation and process, they are increasing the molecular weight and performance stability of brominated epoxy resins. For example, the use of composite catalysts and novel synthesis processes can effectively control the molecular weight of brominated epoxy resins, improving their toughness and impact resistance.

[0005] Furthermore, the development of environmentally friendly brominated epoxy resins also requires consideration of their performance in practical applications. For example, in the electronics and electrical fields, insulation and heat resistance must be guaranteed; in the coatings field, adhesion and weather resistance must be balanced. Therefore, developing a brominated epoxy resin formulation that is both environmentally friendly and high-performance is crucial to meeting the high material demands of modern industry. Summary of the Invention

[0006] In order to solve the above technical problems, the present application provides a brominated epoxy resin, an environmentally friendly brominated epoxy resin formula and a preparation method thereof. The brominated epoxy resin provided by the present application adopts an environmentally friendly and green composite catalyst system and is prepared with the aid of microwave-assisted synthesis technology. It has a short preparation time, high product purity, stable performance, and is more environmentally friendly. The brominated epoxy resin is used as a base resin and is compounded with a nano-toughened epoxy resin and an o-cresol epoxy resin. After curing treatment, the resulting material exhibits excellent high mechanical strength, and at the same time has excellent electrical insulation properties and heat resistance.

[0007] In a first aspect, the present application provides a method for preparing a brominated epoxy resin, which adopts the following technical solution:

[0008] A method for preparing a brominated epoxy resin comprises the following steps:

[0009] The brominated epoxy resin oligomer, tetrabromobisphenol A and tribromophenol are heated and mixed at 140-160° C., a composite catalyst is added, and prepolymerized under microwave conditions to obtain a brominated epoxy resin prepolymer.

[0010] The brominated epoxy resin prepolymer is mixed with a single catalyst and polymerized under microwave conditions to obtain the brominated epoxy resin.

[0011] The brominated epoxy resin oligomer used in this application can be homemade or commercially available, and its molecular weight is mainly between 1000-10000. It is end-capped with tribromophenol, and a composite catalyst and microwave-assisted synthesis technology are used to obtain brominated epoxy resin with a molecular weight of 30000-50000 in a short time.

[0012] Furthermore, the mass ratio of the brominated epoxy resin oligomer, tetrabromobisphenol A and tribromobisphenol is 1:(0.8-0.85):(0.02-0.03), preferably 1:0.82:0.03.

[0013] Furthermore, the composite catalyst is composed of 1-butyl-3-methylimidazolium acetate and tetramethyl titanate mixed in a mass ratio of 1:(0.8-1.2), preferably 1:1.

[0014] Furthermore, based on the mass of the brominated epoxy resin oligomer, the amount of the composite catalyst is 0.03-0.05 wt%, preferably 0.04 wt%.

[0015] Furthermore, the single catalyst is 1-vinylimidazole.

[0016] Furthermore, based on the mass of the brominated epoxy resin prepolymer, the amount of the single catalyst is 0.01-0.03 wt%, preferably 0.02 wt%.

[0017] Furthermore, the microwave conditions for preparing the brominated epoxy resin prepolymer are: frequency 2-2.5 GHz, power 500-1000 W, reaction temperature 140-160° C., and reaction time 10-30 min.

[0018] Furthermore, the microwave conditions for preparing the brominated epoxy resin are: frequency 2-2.5 GHz, power 500-1000 W, reaction temperature 140-160° C., and reaction time 10-30 min.

[0019] Under the microwave reaction conditions, the raw materials react completely, no tetrabromobisphenol A remains, and the preparation temperature is low and the time is short, reducing the 2-4 hours required under conventional heating conditions to within 30 minutes.

[0020] In a second aspect, the present application provides an environmentally friendly brominated epoxy resin formulation, which adopts the following technical solution:

[0021] An environmentally friendly brominated epoxy resin formula comprises the following components in parts by weight: 100 parts of brominated epoxy resin, 5-10 parts of nano-toughened epoxy resin, 5-10 parts of o-cresol epoxy resin, 10-30 parts of curing agent, 0.1-1 part of curing agent accelerator, 15-20 parts of dimethyl sulfoxide, 5-10 parts of silicon micropowder, and 30-50 parts of filler. The brominated epoxy resin is obtained by the above-mentioned preparation method.

[0022] Nano-toughened epoxy resin is a high-performance epoxy resin toughened with nanotechnology. The addition of nanomaterials significantly improves the epoxy resin's impact resistance and fracture toughness, resulting in excellent heat resistance and the ability to maintain good performance even in high-temperature environments. The molecular structure of o-cresol epoxy resin contains multiple epoxy groups, which, after curing, produces numerous and dense crosslinks. The cured product exhibits excellent thermal stability, mechanical strength, electrical insulation, and chemical resistance.

[0023] Furthermore, the curing agent is at least one of an amine curing agent and an acid anhydride curing agent.

[0024] Amine curing agents may include aliphatic amines such as ethylenediamine, diethylenetriamine, and polyethylene polyamines; aromatic amines such as m-phenylenediamine and m-xylylenediamine; or amine-modified curing agents such as T31 curing agent and phenol amino alcohol curing agent. Anhydride curing agents may include organic anhydrides such as maleic anhydride and phthalic anhydride.

[0025] Furthermore, the curing agent accelerator is selected from one or more combinations of phenol accelerators, imidazole accelerators, amine accelerators, and Lewis acid accelerators.

[0026] Among them, phenolic accelerators include but are not limited to phenol, resorcinol, nonylphenol, bisphenol A and 2,4,6-tris(dimethylaminomethyl)phenol, etc., amine accelerators include but are not limited to o-hydroxybenzyldimethylamine, triethylamine, triethanolamine, benzyldimethylamine and alkyltrimethylammonium bromide salts, etc., imidazole accelerators include but are not limited to 2-methylimidazole and 2-phenylimidazole, etc., Lewis acid accelerators include but are not limited to BF3, SnCl4, AlCl3, FeCl3, TiCl4 and ZnCl2, etc.

[0027] Furthermore, the filler is selected from at least one of graphene, silicon dioxide, titanium dioxide, aluminum oxide, and aluminum hydroxide.

[0028] In a third aspect, the present application provides a method for preparing an environmentally friendly brominated epoxy resin formulation, using the following technical solution:

[0029] A method for preparing an environmentally friendly brominated epoxy resin formula comprises the following steps: mixing brominated epoxy resin, nano-toughened epoxy resin, o-cresol epoxy resin, curing agent, curing agent accelerator, dimethyl sulfoxide, silicon micropowder, and filler and stirring uniformly to obtain the environmentally friendly brominated epoxy resin formula that can be directly cured and used.

[0030] In summary, the beneficial effects of the present application are as follows: the present application uses brominated epoxy resin as the base resin, and compounds nano-toughened epoxy resin and o-cresol epoxy resin. After curing treatment, the resulting material exhibits excellent high mechanical strength, while also having excellent electrical insulation properties and heat resistance, and its comprehensive performance is significantly improved. In the process of preparing brominated epoxy resin, the present application adopts an environmentally friendly and green composite catalyst system, and creatively introduces microwave-assisted synthesis technology. Thanks to this advanced process, there is no residue of tetrabromobisphenol A in the final product, and the preparation time is short. Compared with traditional commercially available brominated epoxy resins, its environmental performance is greatly improved, providing a more green, efficient and high-performance material option for related fields. DETAILED DESCRIPTION

[0031] The following describes the embodiments of the present application through specific examples. Those skilled in the art can easily understand the other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through different specific embodiments, and the details in this specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present application.

[0032] Furthermore, it should be understood that the mention of one or more method steps in this application does not preclude the presence of other method steps before or after the combination of steps, or the insertion of other method steps between these explicitly mentioned steps, unless otherwise stated. Furthermore, unless otherwise stated, the numbering of each method step is merely a convenient tool for identifying each method step, and is not intended to limit the order of the method steps or the scope of the application. Changes or adjustments to their relative relationships, without substantially changing the technical content, should also be considered within the scope of the application.

[0033] If the specific experimental conditions are not specified in the examples, they are usually based on conventional conditions in the field or conditions recommended by the reagent company; the materials, reagents, etc. used in the examples can be purchased through commercial channels unless otherwise specified.

[0034] Brominated epoxy resin oligomer was purchased from Guangdong Shengke Biochemical Technology Co., Ltd. with a molecular weight of 1200.

[0035] Nano-toughened epoxy resin: purchased from Sinopec Hunan Petrochemical Co., Ltd., brand CYDN-128, epoxy equivalent weight 200-220 g / eq.

[0036] o-Cresol epoxy resin: purchased from Sinopec Hunan Petrochemical Co., Ltd., brand CYDCN-208, epoxy equivalent weight 200-215 g / eq.

[0037] Example 1-9 Preparation of brominated epoxy resin

[0038] Example 1 Preparation of brominated epoxy resin:

[0039] brominated epoxy resin oligomer, tetrabromobisphenol A, and tribromophenol were mixed at a weight ratio of 1:0.8:0.02, heated at 140° C., and mixed until uniformly distributed. A composite catalyst comprising 1-butyl-3-methylimidazolium acetate and tetramethyl titanate in a weight ratio of 1:0.8 was added, wherein the amount of the composite catalyst was 0.03% of the weight of the brominated epoxy resin oligomer. The mixture was prepolymerized under microwave conditions for 30 minutes to obtain a brominated epoxy resin prepolymer.

[0040] The brominated epoxy resin prepolymer was mixed with 1-vinylimidazole, wherein the amount of 1-vinylimidazole was 0.01% by weight of the brominated epoxy resin prepolymer, and the mixture was polymerized under microwave conditions for 20 minutes to obtain a brominated epoxy resin.

[0041] The above microwave conditions are: frequency 2.45 GHz, power 550 W, and reaction temperature 140°C.

[0042] Example 2 Preparation of brominated epoxy resin: The preparation method is the same as that of Example 1, except that the weight ratio of brominated epoxy resin oligomer, tetrabromobisphenol A and tribromophenol is 1:0.82:0.03.

[0043] Example 3 Preparation of brominated epoxy resin: The preparation method is the same as that of Example 1, except that the weight ratio of brominated epoxy resin oligomer, tetrabromobisphenol A and tribromophenol is 1:0.85:0.03.

[0044] Example 4 Preparation of brominated epoxy resin: The preparation method is the same as that of Example 1, except that the composite catalyst is composed of 1-butyl-3-methylimidazolium acetate and tetramethyl titanate mixed in a weight ratio of 1:1.

[0045] Example 5 Preparation of brominated epoxy resin: The preparation method is the same as that of Example 1, except that the composite catalyst is composed of 1-butyl-3-methylimidazolium acetate and tetramethyl titanate mixed in a weight ratio of 1:1.2.

[0046] Example 6 Preparation of brominated epoxy resin: The preparation method is the same as that of Example 1, except that the amount of the composite catalyst used is 0.04% by weight of the brominated epoxy resin oligomer.

[0047] Example 7 Preparation of brominated epoxy resin: The preparation method is the same as that of Example 1, except that the amount of the composite catalyst used is 0.05% by weight of the brominated epoxy resin oligomer.

[0048] Example 8 Preparation of brominated epoxy resin: The preparation method is the same as that of Example 1, except that the amount of 1-vinylimidazole used is 0.02% by weight of the brominated epoxy resin prepolymer.

[0049] Example 9 Preparation of brominated epoxy resin: The preparation method is the same as that of Example 1, except that the amount of 1-vinylimidazole used is 0.03% by weight of the brominated epoxy resin prepolymer.

[0050] Comparative Example 1 Preparation of brominated epoxy resin:

[0051] brominated epoxy resin oligomer, tetrabromobisphenol A, and tribromophenol were mixed at a weight ratio of 1:0.8:0.02, heated at 140° C., and uniformly mixed. A composite catalyst consisting of 1-butyl-3-methylimidazolium acetate and tetramethyl titanate in a weight ratio of 1:0.8 was added, with the amount of the composite catalyst being 0.03% of the weight of the brominated epoxy resin oligomer. The mixture was heated to 240° C. and reacted for 4 hours to obtain a brominated epoxy resin prepolymer.

[0052] The brominated epoxy resin prepolymer was mixed with 1-vinylimidazole, wherein the amount of 1-vinylimidazole was 0.01% by weight of the brominated epoxy resin prepolymer, and the mixture was heated to 240° C. and reacted for 2 hours to obtain the brominated epoxy resin.

[0053] Comparative Example 2 Preparation of brominated epoxy resin:

[0054] Brominated epoxy resin oligomer, tetrabromobisphenol A and tribromophenol were mixed at a weight ratio of 1:0.8:0.02, heated at 140° C. and uniformly mixed, and a composite catalyst composed of 1-vinylimidazole and tetramethyl titanate in a weight ratio of 1:0.8 was added, the amount of the composite catalyst being 0.03% of the weight of the brominated epoxy resin oligomer, and the mixture was heated to 240° C. and reacted for 4 hours to obtain a brominated epoxy resin prepolymer;

[0055] The brominated epoxy resin prepolymer was mixed with 1-vinylimidazole, wherein the amount of 1-vinylimidazole was 0.01% by weight of the brominated epoxy resin prepolymer, and the mixture was heated to 240° C. and reacted for 2 hours to obtain the brominated epoxy resin.

[0056] The brominated epoxy resins prepared in Examples 1-9 and Comparative Examples 1-2 were tested, and the index data were recorded in Table 1 below. The molecular weight was measured by gel chromatography, the bromine content was measured by oxygen bottle combustion method, and the residual tetrabromobisphenol A was measured by high performance liquid chromatography.

[0057] Table 1 Performance indicators of brominated epoxy resin

[0058]

[0059] It can be seen from the test results in Table 1 that the weight-average molecular weight of the brominated epoxy resin prepared in the present application is around 35,000, and no tetrabromobisphenol A is detected, indicating that the present application scheme has high feasibility and the obtained brominated epoxy resin is highly environmentally friendly.

[0060] Example 10-18 Preparation of environmentally friendly brominated epoxy resin formula, the preparation steps are: brominated epoxy resin, nano-toughened epoxy resin, o-cresol epoxy resin, dicyandiamide (Aradur ® 2844) latent curing agent, 2,4,6-tris(dimethylaminomethyl)phenol (DMP-30) curing agent accelerator, dimethyl sulfoxide, silica powder (average particle size 80nm), and aluminum hydroxide filler (average particle size 10μm) are mixed and stirred evenly to obtain an environmentally friendly brominated epoxy resin formula that can be directly cured.

[0061] Example 10 Environmentally friendly brominated epoxy resin formula: 100 parts of brominated epoxy resin prepared in Example 1, 10 parts of nano-toughened epoxy resin, 10 parts of o-cresol epoxy resin, 10 parts of Aradur ®30 parts of 2844 curing agent, 0.5 parts of DMP-30 curing agent accelerator, 20 parts of dimethyl sulfoxide, 10 parts of silicon micropowder, and 50 parts of aluminum hydroxide.

[0062] Example 11 Environmentally friendly brominated epoxy resin formula: 100 parts of the brominated epoxy resin prepared in Example 2, and the rest are the same as in Example 10.

[0063] Example 12 Environmentally friendly brominated epoxy resin formula: 100 parts of the brominated epoxy resin prepared in Example 3, and the rest are the same as in Example 10.

[0064] Example 13 Environmentally friendly brominated epoxy resin formula: 100 parts of the brominated epoxy resin prepared in Example 4, and the rest are the same as in Example 10.

[0065] Example 14 Environmentally friendly brominated epoxy resin formula: 100 parts of the brominated epoxy resin prepared in Example 5, and the rest are the same as in Example 10.

[0066] Example 15 Environmentally friendly brominated epoxy resin formula: 100 parts of the brominated epoxy resin prepared in Example 6, and the rest are the same as in Example 10.

[0067] Example 16 Environmentally friendly brominated epoxy resin formula: 100 parts of the brominated epoxy resin prepared in Example 7, and the rest are the same as in Example 10.

[0068] Example 17 Environmentally friendly brominated epoxy resin formula: 100 parts of the brominated epoxy resin prepared in Example 8, and the rest are the same as in Example 10.

[0069] Example 18 Environmentally friendly brominated epoxy resin formula: 100 parts of the brominated epoxy resin prepared in Example 9, and the rest are the same as in Example 10.

[0070] Comparative Example 3: Formulation of brominated epoxy resin: 100 parts of the brominated epoxy resin prepared in Comparative Example 1, and the rest of the preparation was the same as in Example 10.

[0071] Comparative Example 4: Formulation of brominated epoxy resin: 100 parts of the brominated epoxy resin prepared in Comparative Example 2, and the rest of the preparation was the same as in Example 10.

[0072] Comparative Example 5 Brominated epoxy resin formula: 110 parts of brominated epoxy resin prepared in Example 1, 10 parts of nano-toughened epoxy resin, and Aradur ® 30 parts of 2844 curing agent, 0.5 parts of DMP-30 curing agent accelerator, 20 parts of dimethyl sulfoxide, 10 parts of silicon powder, and 50 parts of aluminum hydroxide.

[0073] Comparative Example 6 Brominated epoxy resin formula: 110 parts of brominated epoxy resin prepared in Example 1, 10 parts of o-cresol epoxy resin, and 10 parts of Aradur ®30 parts of 2844 curing agent, 0.5 parts of DMP-30 curing agent accelerator, 20 parts of dimethyl sulfoxide, 10 parts of silicon powder, and 50 parts of aluminum hydroxide.

[0074] The brominated epoxy resin formulation prepared in this application can be used for castings, laminates and adhesives, etc., especially for resin sheets, resin composite metal foils, prepregs, laminates, metal foil-clad laminates and printed circuit boards.

[0075] Performance testing:

[0076] 2116 electronic-grade glass cloth was impregnated with the brominated epoxy resin solutions prepared in Examples 10-18 and Comparative Examples 3-6, respectively. The solvent was removed at 150°C to obtain prepreg samples. Eight prepreg samples were stacked with two one-ounce electrolytic copper foils and laminated using a hot press to produce double-sided copper-clad laminates. The performance indicators of these laminates were tested and recorded in Table 2.

[0077] Test indicators and methods:

[0078] Tg: Glass transition temperature, measured according to the DSC test method specified in IPC-TM-650 2.4.25.

[0079] Dielectric constant: Measured in accordance with IPC-TM-650 2.5.5.13.

[0080] Solder resistance: The double-sided copper-clad laminate was immersed in a tin pot at 288°C for 20 seconds, cooled to room temperature, and then immersed in the tin pot again for 5 times. The solder resistance was evaluated by observing the appearance.

[0081] PCT: The copper-clad laminate is immersed in a copper etching solution to remove the surface copper foil for evaluation. The substrate is then placed in a steam pressure cooker and treated at 121°C, 2 atm for 2 hours. The substrate is then immersed in a tin pot at 288°C. The time at which blistering or cracking occurs is recorded. Evaluation is terminated if no blistering or delamination occurs after 5 minutes in the tin pot.

[0082] Td: Double-sided copper-clad laminates are immersed in a copper etchant to remove the surface copper foil. The substrates are then tested using a thermogravimetric analyzer (TGA) in a nitrogen atmosphere at a rate of 10°C / min to the temperature at which 5% weight loss is achieved.

[0083] Interlayer peel strength: measured in accordance with IPC-TM-650 2.4.8.

[0084] Pass lead-free reflow soldering without delamination: Tested using TMA, with a heating rate of 10°C / min and a peak temperature of 260°C.

[0085] Table 2 Performance indicators of double-sided copper-clad laminates

[0086]

[0087] It can be seen from the test results in Table 2 that the double-sided copper-clad laminates prepared in Examples 10-18 of the present application have excellent properties such as dielectric constant, heat resistance, and solder immersion resistance.

[0088] Compared with Example 10, the thermal decomposition temperatures of Comparative Examples 3 and 4 are lower and the thermal stratification times are shorter. This is because the higher residual amount of tetrabromobisphenol A will have a greater negative impact on the heat resistance of the product.

[0089] Compared with Example 10, the various properties of Comparative Examples 5 and 6 have declined, and the interlayer peel strength has the largest decrease, which shows that for the formulation of this application, it is necessary to add nano-toughened epoxy resin and o-cresol epoxy resin. The two epoxy resins can significantly improve the peel strength of the formulation after curing.

[0090] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form or substance. It should be pointed out that ordinary technicians in this technical field can make several improvements and supplements without departing from the method of the present invention. These improvements and supplements should also be regarded as the scope of protection of the present invention. Any equivalent changes, modifications and evolutions made by technicians familiar with this profession without departing from the spirit and scope of the present invention by using the technical content disclosed above are all equivalent embodiments of the present invention; at the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A brominated epoxy resin, characterized in that The brominated epoxy resin is obtained by the following preparation steps: The brominated epoxy resin oligomer, tetrabromobisphenol A and tribromophenol are heated and mixed at 140-160° C., a composite catalyst is added, and prepolymerized under microwave conditions to obtain a brominated epoxy resin prepolymer. The brominated epoxy resin prepolymer is mixed with a single catalyst and polymerized under microwave conditions to obtain the brominated epoxy resin; The microwave conditions are: frequency 2-2.5 GHz, power 500-1000 W, reaction temperature 140-160° C., reaction time 10-30 min; The composite catalyst is composed of 1-butyl-3-methylimidazolium acetate and tetramethyl titanate in a mass ratio of 1:(0.8-1.2), and the amount of the composite catalyst is 0.03-0.05wt% based on the mass of the brominated epoxy resin oligomer; The single catalyst is 1-vinylimidazole, and the amount of the single catalyst used is 0.01-0.03 wt % based on the mass of the brominated epoxy resin prepolymer.

2. The brominated epoxy resin according to claim 1, wherein The mass ratio of the brominated epoxy resin oligomer, tetrabromobisphenol A and tribromobisphenol is 1:(0.8-0.85):(0.02-0.03).

3. An environmentally friendly brominated epoxy resin, characterized in that The invention comprises the following components in parts by weight: 100 parts of the brominated epoxy resin according to any one of claims 1 to 2, 5-10 parts of nano-toughened epoxy resin, 5-10 parts of o-cresol epoxy resin, 10-30 parts of curing agent, 0.1-1 part of curing agent accelerator, 15-20 parts of dimethyl sulfoxide, 5-10 parts of silicon powder, and 30-50 parts of filler; The filler is selected from at least one of graphene, titanium dioxide, aluminum oxide, and aluminum hydroxide.

4. The environmentally friendly brominated epoxy resin according to claim 3, characterized in that The curing agent is at least one of an amine curing agent and an acid anhydride curing agent.

5. The environmentally friendly brominated epoxy resin according to claim 3, characterized in that The curing agent accelerator is selected from one or more combinations of phenol accelerators, imidazole accelerators, amine accelerators, and Lewis acid accelerators.

6. A method for preparing the environmentally friendly brominated epoxy resin according to any one of claims 3 to 5, characterized in that: The preparation method comprises the following steps: mixing brominated epoxy resin, nano-toughened epoxy resin, o-cresol epoxy resin, curing agent, curing agent accelerator, dimethyl sulfoxide, silicon micropowder and filler and stirring evenly to obtain environmentally friendly brominated epoxy resin that can be directly cured and used.

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