Preparation method of octabromo-ether

Abstract

The invention provides a preparation method of octabromo-ether, and belongs to the technical field of flame-retardant materials. According to the method, the tetrabromobisphenol A and the allyl bromide are subjected to the carbon-oxygen coupling reaction under the catalysis of the catalyst, no halogenated salt byproduct is generated, repeated purification is not needed, the loss of the octabromo-ether caused by aftertreatment is effectively reduced, and the yield of the octabromo-ether is increased; then hydrobromic acid and tetrabromobisphenol A diallyl ether are subjected to an addition reaction under catalytic oxidation of hydrogen peroxide to obtain octabromoether, and high-toxicity bromine does not need to be adopted; and hydrogen peroxide is adopted to generate oxygen and water in the reaction, thereby being green and environment-friendly. The result of the embodiment shows that the preparation method provided by the invention is green and environment-friendly, and the yield of the prepared octabromo-ether can reach 99.6%.

Description

Technical Field

[0001] The present invention relates to the field of flame retardant materials, and particularly to a preparation method of octabromodiphenyl ether. Background Art

[0002] Octabromodiphenyl ether, with the molecular formula C 21 H 20 Br8O2, is a highly efficient flame retardant containing both aromatic bromine and aliphatic bromine, having excellent thermal stability and light stability, and is mainly used in polypropylene, polypropylene ethylene, polypropylene ethylene resin and polyvinyl chloride resin.

[0003] Currently, the preparation of octabromodiphenyl ether is mainly achieved by reacting tetrabromobisphenol A sodium salt with allyl chloride (bromide) to obtain the intermediate of tetrabromobisphenol A diallyl ether, and then preparing octabromodiphenyl ether through bromination with bromine. However, this preparation method will generate a large amount of salt during the preparation of the tetrabromobisphenol A diallyl ether intermediate, and subsequent multiple purifications are required, which will cause the loss of octabromodiphenyl ether during the process and reduce the yield of octabromodiphenyl ether; moreover, the bromine used in this preparation method has high toxicity, and long-term exposure to low concentrations of bromine may cause neurasthenia syndrome, respiratory tract inflammation or allergic dermatitis. Summary of the Invention

[0004] The purpose of the present invention is to provide a preparation method of octabromodiphenyl ether, which does not require the use of highly toxic raw materials, and is simple to operate and has a high yield.

[0005] In order to achieve the above-mentioned invention purpose, the present invention provides the following technical solutions:

[0006] The present invention provides a preparation method of octabromodiphenyl ether, comprising the following steps:

[0007] (1) Mix tetrabromobisphenol A, allyl bromide, a transition metal catalyst and a halogenated hydrocarbon organic solvent, and then carry out a carbon-oxygen coupling reaction to obtain a solution of tetrabromobisphenol A diallyl ether;

[0008] (2) Mix the solution of tetrabromobisphenol A diallyl ether obtained in step (1) with hydrobromic acid and hydrogen peroxide, and then carry out an addition reaction to obtain octabromodiphenyl ether.

[0009] Preferably, the molar ratio of tetrabromobisphenol A to allyl bromide in step (1) is 1:(2 - 8).

[0010] Preferably, the mass ratio of tetrabromobisphenol A to the transition metal catalyst in step (1) is 1:(0.001 - 0.2).

[0011] Preferably, the transition metal catalyst in step (1) includes cuprous bromide, palladium bromide or cuprous oxide.

[0012] Preferably, the mass ratio of tetrabromobisphenol A to the halogenated hydrocarbon organic solvent in the step (1) is 1:(2-20).

[0013] Preferably, the halogenated hydrocarbon organic solvent in the step (1) includes dichloroethane or chlorobenzene.

[0014] Preferably, the temperature of the carbon-oxygen coupling reaction in the step (1) is 40-100 °C, and the time of the carbon-oxygen coupling reaction is 0.5-15 h.

[0015] Preferably, the molar ratio of tetrabromobisphenol A in the step (1) to hydrogen bromide in the hydrobromic acid in the step (2) is 1:(4-8).

[0016] Preferably, the molar ratio of tetrabromobisphenol A in the step (1) to hydrogen peroxide in the hydrogen peroxide in the step (2) is 1:(2-2.1).

[0017] Preferably, the temperature of the addition reaction in the step (2) is 30-60 °C, and the time of the addition reaction is 1-15 h.

[0018] The present invention provides a method for preparing octabromodiphenyl ether, comprising the following steps: (1) mixing tetrabromobisphenol A, allyl bromide, a transition metal catalyst and a halogenated hydrocarbon organic solvent, and then carrying out a carbon-oxygen coupling reaction to obtain a tetrabromobisphenol A diallyl ether solution; (2) mixing the tetrabromobisphenol A diallyl ether solution obtained in the step (1) with hydrobromic acid and hydrogen peroxide, and then carrying out an addition reaction to obtain octabromodiphenyl ether. In the present invention, tetrabromobisphenol A and allyl bromide are subjected to a carbon-oxygen coupling reaction under the catalysis of a catalyst to obtain tetrabromobisphenol A diallyl ether and hydrogen bromide, without the generation of halogenated salt by-products, and without multiple purifications, effectively reducing the loss of octabromodiphenyl ether caused by post-treatment and improving the yield of octabromodiphenyl ether; then, hydrobromic acid and tetrabromobisphenol A diallyl ether are subjected to an addition reaction under the catalytic oxidation of hydrogen peroxide to obtain octabromodiphenyl ether, without using highly toxic bromine; and hydrogen peroxide generates oxygen and water in the reaction, which is green and environmentally friendly. The results of the examples show that the preparation method provided by the present invention is green and environmentally friendly, and the yield of the obtained octabromodiphenyl ether can reach 99.6%. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 1H NMR spectrum of tetrabromobisphenol A diallyl ether in Example 1 of the present invention;

[0020] Figure 2 1H NMR spectrum of the octabromodiphenyl ether prepared in Example 1 of the present invention;

[0021] Figure 3 Infrared spectrum of the octabromodiphenyl ether prepared in Example 1 of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0022] The present invention provides a method for preparing octabromodiphenyl ether, comprising the following steps:

[0023] (1) Mix tetrabromobisphenol A, allyl bromide, a transition metal catalyst and a halogenated hydrocarbon organic solvent, and then carry out a carbon-oxygen coupling reaction to obtain a tetrabromobisphenol A diallyl ether solution;

[0024] (2) Mix the tetrabromobisphenol A diallyl ether solution obtained in step (1) with hydrobromic acid and hydrogen peroxide, and then carry out an addition reaction to obtain octabromodiphenyl ether.

[0025] In the present invention, tetrabromobisphenol A, allyl bromide, a transition metal catalyst and a halogenated hydrocarbon organic solvent are mixed and then a carbon-oxygen coupling reaction is carried out to obtain a tetrabromobisphenol A diallyl ether solution.

[0026] In the present invention, the molar ratio of tetrabromobisphenol A to allyl bromide is preferably 1:(2 - 8). In the embodiments of the present invention, the molar ratio of tetrabromobisphenol A to allyl bromide can specifically be 1:2, 1:3, 1:4, 1:5, 1:6, 1:7 or 1:8. By limiting the molar ratio of tetrabromobisphenol A to allyl bromide, the reaction of tetrabromobisphenol A with allyl bromide can be made more complete.

[0027] In the present invention, the transition metal catalyst preferably includes cuprous bromide, palladium bromide or cuprous oxide. By limiting the type of the transition metal catalyst, the carbon-oxygen coupling reaction of tetrabromobisphenol A with allyl bromide can be catalyzed more fully.

[0028] In the present invention, the mass ratio of tetrabromobisphenol A to the transition metal catalyst is preferably 1:(0.001 - 0.2). As an implementation manner, the mass ratio of tetrabromobisphenol A to the transition metal catalyst can be 1:(0.01 - 0.15), or can also be 1:(0.05 - 0.1). In the embodiments of the present invention, the mass ratio of tetrabromobisphenol A to the transition metal catalyst can specifically be 1:0.001, 1:0.003, 1:0.006, 1:0.009, 1:0.01, 1:0.03, 1:0.06, 1:0.09, 1:0.1, 1:0.15 or 1:0.2. By limiting the mass ratio of tetrabromobisphenol A to the transition metal catalyst, the carbon-oxygen coupling reaction of tetrabromobisphenol A with allyl bromide can be ensured to proceed more fully.

[0029] In the present invention, the halogenated hydrocarbon organic solvent preferably includes dichloroethane or chlorobenzene. By limiting the type of the halogenated hydrocarbon organic solvent, it is ensured that tetrabromobisphenol A, allyl bromide and the transition metal catalyst are dissolved more fully, and further the carbon-oxygen coupling reaction of tetrabromobisphenol A with allyl bromide proceeds more fully.

[0030] In the present invention, the mass ratio of the tetrabromobisphenol A to the halogenated hydrocarbon organic solvent is preferably 1:(2 - 20). In the examples of the present invention, the mass ratio of the tetrabromobisphenol A to the halogenated hydrocarbon organic solvent may specifically be 1:2, 1:5, 1:10, 1:15 or 1:20. The present invention limits the mass ratio of the tetrabromobisphenol A to the halogenated hydrocarbon organic solvent to ensure that the tetrabromobisphenol A, allyl bromide and transition metal catalyst are more fully dissolved, and further enables the carbon-oxygen coupling reaction between the tetrabromobisphenol A and the allyl bromide to proceed more fully.

[0031] The present invention has no special limitation on the mixing of the tetrabromobisphenol A, allyl bromide, transition metal catalyst and halogenated hydrocarbon organic solvent, and any well-known mixing method in the art can be adopted.

[0032] In the present invention, in the carbon-oxygen coupling reaction under the action of the transition metal catalyst, the hydrogen of the active carbon-hydrogen bond on the allyl bromide is removed to form a transition metal carbon intermediate, and then this intermediate reacts with the active carbon-oxygen bond on the tetrabromobisphenol A to form a new carbon-oxygen bond, thereby obtaining tetrabromobisphenol A diallyl ether. In the present invention, the temperature of the carbon-oxygen coupling reaction is preferably 40 - 100°C. In the examples of the present invention, the temperature of the carbon-oxygen coupling reaction may specifically be 40°C, 50°C, 60°C, 70°C, 80°C, 90°C or 100°C. In the present invention, the time of the carbon-oxygen coupling reaction is preferably 0.5 - 15 h. In the examples of the present invention, the time of the carbon-oxygen coupling reaction may specifically be 0.5 h, 1 h, 2 h, 5 h, 10 h or 15 h. The present invention limits the temperature and time of the carbon-oxygen coupling reaction to ensure that the reaction proceeds more fully.

[0033] After the carbon-oxygen coupling reaction is completed, the present invention preferably filters, distills and cools the mixed solution after the carbon-oxygen coupling reaction is completed to obtain a tetrabromobisphenol A diallyl ether solution.

[0034] The present invention has no special limitation on the filtration, and any well-known filtration method in the art can be adopted. The present invention has no special limitation on the distillation, and the hydrogen bromide and excessive allyl bromide can be removed by using any well-known distillation method in the art. In the examples of the present invention, the distillation method may specifically be vacuum distillation. The present invention has no special limitation on the cooling, and the mixed solution can be cooled to 30°C by using any well-known cooling method in the art.

[0035] After obtaining the tetrabromobisphenol A diallyl ether solution, the present invention mixes the tetrabromobisphenol A diallyl ether solution with hydrobromic acid and hydrogen peroxide and then conducts an addition reaction to obtain octabromodiphenyl ether.

[0036] In the present invention, the mass concentration of the hydrobromic acid is preferably 10% - 48%.

[0037] In the present invention, the molar ratio of the tetrabromobisphenol A to hydrogen bromide in hydrobromic acid is preferably 1:(4 - 8). In the embodiments of the present invention, the molar ratio of the tetrabromobisphenol A to hydrogen bromide in hydrobromic acid can specifically be 1:4, 1:5, 1:6, 1:7, or 1:8. The present invention ensures more complete reaction of the tetrabromobisphenol A diallyl ether by defining the molar ratio of the tetrabromobisphenol A to hydrogen bromide in hydrobromic acid.

[0038] In the present invention, the mass concentration of the hydrogen peroxide is preferably 10% - 30%.

[0039] In the present invention, the molar ratio of the tetrabromobisphenol A to hydrogen peroxide in hydrogen peroxide is preferably 1:(2 - 2.1). The present invention can catalyze and oxidize the addition reaction of the tetrabromobisphenol A with hydrogen bromide in hydrobromic acid to proceed more fully by defining the molar ratio of the tetrabromobisphenol A to hydrogen peroxide in hydrogen peroxide, and hydrogen peroxide generates oxygen and water during the reaction, which is green and environmentally friendly.

[0040] In the present invention, the mixing of the tetrabromobisphenol A diallyl ether solution with hydrobromic acid and hydrogen peroxide is preferably carried out under stirring. In the present invention, the stirring rate is preferably 300 - 2000 rpm.

[0041] In the present invention, bromine in hydrobromic acid is added to the double bond of the tetrabromobisphenol A diallyl ether in the addition reaction to obtain octabromodiphenyl ether. In the present invention, the temperature of the addition reaction is preferably 30 - 60°C. In the embodiments of the present invention, the temperature of the addition reaction can specifically be 30°C, 35°C, 40°C, 45°C, 50°C, 55°C, or 60°C. In the present invention, the time of the addition reaction is preferably 1 - 15 h. In the embodiments of the present invention, the time of the addition reaction can specifically be 1 h, 2 h, 5 h, 10 h, or 15 h. The present invention ensures more complete reaction by defining the temperature and time of the addition reaction.

[0042] After the addition reaction is completed, the present invention preferably evaporates the mixture after the addition reaction to dryness to obtain octabromodiphenyl ether.

[0043] The present invention has no special limitation on the evaporation method, and any evaporation method well-known in the art can be used.

[0044] The present invention obtains tetrabromobisphenol A diallyl ether and hydrogen bromide by carrying out a carbon-oxygen coupling reaction between tetrabromobisphenol A and allyl bromide under the catalysis of a catalyst. There is no generation of halogenated salt by-products, and there is no need for multiple purifications, effectively reducing the loss of octabromodiphenyl ether caused by post-treatment and improving the yield of octabromodiphenyl ether. Subsequently, an addition reaction is carried out between hydrobromic acid and tetrabromobisphenol A diallyl ether under the catalytic oxidation of hydrogen peroxide to obtain octabromodiphenyl ether, without using highly toxic bromine. Moreover, hydrogen peroxide generates oxygen and water during the reaction, which is green and environmentally friendly.

[0045] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0046] Example 1

[0047] A preparation method of octabromodiphenyl ether comprises the following steps:

[0048] (1) Mix 544.0 g of tetrabromobisphenol A, 350 g of allyl bromide, 1.5 g of cuprous bromide, and 2000 g of dichloroethane, and react at 60 °C for 5.5 h. Then, filter the reaction mixture, carry out vacuum distillation, and cool it to 30 °C at room temperature to obtain a tetrabromobisphenol A diallyl ether solution. The molar ratio of tetrabromobisphenol A to allyl bromide is 1:2.89. The mass ratio of tetrabromobisphenol A to cuprous bromide is 1:0.0027. The mass ratio of tetrabromobisphenol A to dichloroethane is 1:3.67.

[0049] (2) Mix the tetrabromobisphenol A diallyl ether solution obtained in step (1) with 850 g of hydrobromic acid with a mass concentration of 48% and 227 g of hydrogen peroxide with a mass concentration of 30% at a stirring rate of 1000 rpm, and react at 40 °C for 4.5 h. Then, evaporate the reaction mixture to dryness at normal pressure to obtain 940.1 g of octabromodiphenyl ether, with a yield of 99.6% and a purity of 99.2%. The molar ratio of tetrabromobisphenol A to hydrogen bromide in hydrobromic acid is 1:5. The molar ratio of tetrabromobisphenol A to hydrogen peroxide in hydrogen peroxide is 1:2.

[0050] The present invention characterized tetrabromobisphenol A diallyl ether and octabromodiphenyl ether by using a nuclear magnetic spectroscopy instrument, and the results are respectively as Figure 1 and Figure 2 shown. From Figure 1 it can be known that the nuclear magnetic hydrogen spectrum data of tetrabromobisphenol A diallyl ether is 11H NMR (500 MHz, CDCl3) δ 7.30 (s, 4H), 6.17 (ddt, J = 16.3, 10.5, 5.8 Hz, 2H), 5.49 - 5.44 (m, 2H), 5.30 (dd, J = 10.4, 1.2 Hz, 2H), 4.56 - 4.54 (m, 4H), 1.60 (s, 6H). It can be seen that the tetra - bromobisphenol A diallyl ether was obtained in Example 1 of the present invention; from Figure 2 it is known that the 1H NMR data of octabromodiphenyl ether are 1 1H NMR (500 MHz, CDCl3) δ 7.30 (s, 4H), 4.53 (dq, J = 7.2, 5.2 Hz, 2H), 4.43 (dd, J = 9.9, 6.0 Hz, 2H), 4.34 (dd, J = 9.9, 4.9 Hz, 2H), 4.08 (dd, J = 10.8, 7.3 Hz, 2H), 3.95 (dd, J = 10.8, 5.2 Hz, 2H), 1.60 (s, 6H); It can be seen that the octabromodiphenyl ether was obtained in Example 1 of the present invention.

[0051] The octabromodiphenyl ether prepared in Example 1 was characterized by an infrared spectrometer by the present invention, as Figure 3 shown. It can be seen from the figure that the infrared spectral data of octabromodiphenyl ether are C = C (aromatic ring): 1450 cm -1 ; C - O - C (ether bond): 1253 cm -1 ; C - H (bending vibration, benzene ring substitution): 736 cm -1 ; C - Br (stretching vibration): 574 cm -1 ; This further indicates that the octabromodiphenyl ether was obtained in Example 1 of the present invention.

[0052] Example 2

[0053] A preparation method of octabromodiphenyl ether, which consists of the following steps:

[0054] (1) Mix 544.0 g of tetra - bromobisphenol A, 242 g of allyl bromide, 108.8 g of cuprous bromide and 10880 g of chlorobenzene, and react at 100 °C for 0.5 h. Then, the reaction mixture is filtered, distilled under reduced pressure and cooled to 30 °C in sequence to obtain a tetra - bromobisphenol A diallyl ether solution; the molar ratio of tetra - bromobisphenol A to allyl bromide is 1:2; the mass ratio of tetra - bromobisphenol A to cuprous bromide is 1:0.2; the mass ratio of tetra - bromobisphenol A to chlorobenzene is 1:20;

[0055] (2) Mix the solution of tetrabromobisphenol A diallyl ether obtained in step (1) with 1350 g of hydrobromic acid with a mass concentration of 48% and 238 g of hydrogen peroxide with a mass concentration of 30% at a stirring rate of 2000 rpm, then react at 60 °C for 1 h, and then evaporate the reacted mixture to dryness under normal pressure to obtain 879.9 g of octabromodiphenyl ether, with a yield of 93.2% and a purity of 97.7%; the molar ratio of tetrabromobisphenol A to hydrogen bromide in hydrobromic acid is 1:8; the molar ratio of tetrabromobisphenol A to hydrogen peroxide in hydrogen peroxide is 1:2.1.

[0056] Example 3

[0057] The difference between this example and Example 1 is that in step (1), 484 g of allyl bromide is used and the reaction time is 2.5 h; the molar ratio of tetrabromobisphenol A to allyl bromide is 1:4; in step (2), the stirring rate is 300 rpm; the rest is the same as in Example 1, obtaining 933.1 g of octabromodiphenyl ether, with a yield of 98.8% and a purity of 98.3%.

[0058] Example 4

[0059] The difference between this example and Example 1 is that in step (1), 968 g of allyl bromide is used and the reaction time is 2.5 h; the molar ratio of tetrabromobisphenol A to allyl bromide is 1:8; in step (2), 980 g of hydrobromic acid with a mass concentration of 48% is used, the stirring rate is 1500 rpm, and the molar ratio of tetrabromobisphenol A to hydrogen bromide in hydrobromic acid is 1:5.81; the rest is the same as in Example 1, obtaining 935.5 g of octabromodiphenyl ether, with a yield of 99.1% and a purity of 98.9%.

[0060] Example 5

[0061] The difference between this example and Example 1 is that in step (1), 500 g of allyl bromide, 0.544 g of cuprous bromide, and 1088 g of dichloroethane are used; the molar ratio of tetrabromobisphenol A to allyl bromide is 1:4.13; the mass ratio of tetrabromobisphenol A to cuprous bromide is 1:0.001; the mass ratio of tetrabromobisphenol A to dichloroethane is 1:2; in step (2), 226.7 g of hydrogen peroxide with a mass concentration of 30% is used, the stirring rate is 1200 rpm, and the reaction is carried out at 30 °C for 15 h. The molar ratio of tetrabromobisphenol A to hydrogen peroxide in hydrogen peroxide is 1:2. The rest is the same as in Example 1, obtaining 917.6 g of octabromodiphenyl ether, with a yield of 97.2% and a purity of 98.7%.

[0062] Example 6

[0063] The differences between this example and Example 1 are as follows: In step (1), 500 g of allyl bromide, 5.5 g of cuprous bromide, and 3000 g of dichloroethane are reacted at 40 °C for 15 h. The molar ratio of tetrabromobisphenol A to allyl bromide is 1:4.13; the mass ratio of tetrabromobisphenol A to cuprous bromide is 1:0.001; the mass ratio of tetrabromobisphenol A to dichloroethane is 1:5.5. In step (2), 1000 g of hydrobromic acid is reacted at 30 °C for 10 h. The molar ratio of tetrabromobisphenol A to hydrogen bromide in hydrobromic acid is 1:5.93. The rest is the same as in Example 1, and 929.6 g of octabromodiphenyl ether is obtained, with a yield of 98.5% and a purity of 97.9%.

[0064] Example 7

[0065] The differences between this example and Example 1 are as follows: In step (1), 500 g of allyl bromide, 5.5 g of cuprous bromide, and 3000 g of dichloroethane are reacted at 40 °C for 15 h. The molar ratio of tetrabromobisphenol A to allyl bromide is 1:4.13; the mass ratio of tetrabromobisphenol A to cuprous bromide is 1:0.01; the mass ratio of tetrabromobisphenol A to dichloroethane is 1:5.5. In step (2), 675 g of hydrobromic acid is reacted at 60 °C for 3 h. The molar ratio of tetrabromobisphenol A to hydrogen bromide in hydrobromic acid is 1:4. The rest is the same as in Example 1, and 918.7 g of octabromodiphenyl ether is obtained, with a yield of 97.3% and a purity of 98.5%.

[0066] Example 8

[0067] The differences between this example and Example 1 are as follows: In step (1), 500 g of allyl bromide, 1.5 g of palladium bromide, and 3000 g of dichloroethane are reacted at 40 °C for 15 h. The molar ratio of tetrabromobisphenol A to allyl bromide is 1:4.13; the mass ratio of tetrabromobisphenol A to cuprous bromide is 1:0.0027; the mass ratio of tetrabromobisphenol A to dichloroethane is 1:5.5. In step (2), 675 g of hydrobromic acid is reacted at 60 °C for 3 h. The molar ratio of tetrabromobisphenol A to hydrogen bromide in hydrobromic acid is 1:4. The rest is the same as in Example 1, and 919.9 g of octabromodiphenyl ether is obtained, with a yield of 97.4% and a purity of 98.0%.

[0068] In summary, it can be seen that the octabromodiphenyl ether prepared by the preparation method of octabromodiphenyl ether provided by the present invention has a high yield.

[0069] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A preparation method of octabromoether, comprising the following steps: (1) Mix tetrabromobisphenol A, allyl bromide, a transition metal catalyst, and a halogenated hydrocarbon organic solvent, and then carry out a carbon-oxygen coupling reaction to obtain a tetrabromobisphenol A diallyl ether solution; (2) Mix the tetrabromobisphenol A diallyl ether solution obtained in step (1) with hydrobromic acid and hydrogen peroxide, and then carry out an addition reaction to obtain octabromoether.

2. The preparation method according to claim 1, characterized in that, In step (1), the molar ratio of tetrabromobisphenol A to allyl bromide is 1:(2 - 8).

3. The preparation method according to claim 1, characterized in that, In step (1), the mass ratio of tetrabromobisphenol A to the transition metal catalyst is 1:(0.001 - 0.2).

4. The preparation method according to claim 1 or 3, characterized in that, The transition metal catalyst in step (1) includes cuprous bromide, palladium bromide, or cuprous oxide.

5. The preparation method according to claim 1, wherein In step (1), the mass ratio of tetrabromobisphenol A to the halogenated hydrocarbon organic solvent is 1:(2 - 20).

6. The preparation method according to claim 1 or 5, characterized in that, The halogenated hydrocarbon organic solvent in step (1) includes dichloroethane or chlorobenzene.

7. The preparation method according to claim 1, characterized in that, In step (1), the temperature of the carbon-oxygen coupling reaction is 40 - 100 °C, and the time of the carbon-oxygen coupling reaction is 0.5 - 15 h.

8. The preparation method according to claim 1, wherein In step (1), the molar ratio of tetrabromobisphenol A to hydrogen bromide in the hydrobromic acid in step (2) is 1:(4 - 8).

9. The preparation method according to claim 1, characterized in that, In step (1), the molar ratio of tetrabromobisphenol A to hydrogen peroxide in the hydrogen peroxide in step (2) is 1:(2 - 2.1).

10. The preparation method according to claim 1, characterized in that, In step (2), the temperature of the addition reaction is 30 - 60 °C, and the time of the addition reaction is 1 - 15 h.

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