A method for preparing and using polyphenyl phosphine oxide compounds

Abstract

The application discloses a preparation method and application of a multi-phenyl phosphorus oxide compound and belongs to the technical field of organic synthesis. Different properties of raw materials are respectively dissolved through double solvents, a catalyst is added into the system, and the entering of the alkali metal salt reactant into the organic phase reaction is helped to be dissolved to obtain a molecular level reactant, so that the reaction is promoted to be completely carried out, the yield of a product is improved, the proportion of impurities, such as the reactant, contained in the product is reduced, the purity of the product is improved, and the high-purity product is a material with low dielectric property. The material is tested in various performances, and excellent flame retardance and low dielectric constant are obtained.

Description

Technical Field

[0001] This invention relates to the field of organic synthesis technology, and more specifically, to a method for preparing and applying a polyphenylphosphine oxide compound. Background Technology

[0002] In the traditional 4G communication era, organophosphorus flame retardants were added to achieve flame retardancy in widely used epoxy resin materials, maintaining a certain dielectric constant while meeting the corresponding flame retardancy rating. However, these phosphorus-based flame retardants typically lack sufficient thermal stability to meet the requirements of 5G materials, which demand higher heat generation and greater thermal stability. Furthermore, traditional organophosphorus flame retardants often exhibit hygroscopic properties, leading to an increase in the dielectric constant of the flame-retarded material, thus deteriorating its dielectric properties. Since 5G materials require both low dielectric constants and high flame retardancy, continuing to use these same flame retardants will not meet the low dielectric requirements of 5G. Therefore, it is necessary to develop novel flame retardant systems.

[0003] Therefore, it is necessary to develop a method for preparing and applying polyphenylphosphine oxides. Summary of the Invention

[0004] The purpose of this invention is to overcome the defects of the prior art by providing a method for preparing and applying polyphenylphosphine oxides.

[0005] The technical problem solved by this invention is achieved by the following technical solution.

[0006] The present invention also provides a method for preparing the above-mentioned polyphenylphosphine oxide compound, comprising the following steps: dissolving diphenylphosphine halide in water, then adding an alkali metal salt to react and obtain a first reaction solution; dissolving an organohalide in an organic solvent to obtain a second reaction solution; adding the second reaction solution dropwise to the first reaction solution in the presence of a catalyst, and collecting the precipitate obtained from the reaction, which is the polyphenylphosphine oxide compound.

[0007] The present invention also provides a material containing a polyphenylphosphine oxide compound, the material comprising at least one of nylon, polyester, epoxy resin, benzoxazine resin, polyphenylene ether resin and polyolefin resin.

[0008] The present invention has the following beneficial effects:

[0009] This invention provides a method for preparing and applying a polyphenylphosphine oxide compound. In the preparation process, raw materials with different properties are dissolved separately using two solvents. A catalyst is added to the system to help the alkali metal salt reactants enter the organic phase for reaction and dissolution, resulting in molecular-level reactants. This promotes a more complete reaction, increases the product yield, and reduces the proportion of impurities such as reactants in the product, thus improving product purity. The high-purity product yields a material with low dielectric properties. Testing of the obtained material reveals excellent flame retardancy and a low dielectric constant. Attached Figure Description

[0010] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 The 1H NMR spectrum of the product of Example 1;

[0012] Figure 2 The NMR phosphorus spectrum of the product of Example 1. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0014] The following provides a detailed description of the preparation method and application of a polyphenylphosphine oxide provided in the embodiments of the present invention.

[0015] In a first aspect, embodiments of the present invention provide a method for preparing a polyphenylphosphine oxide compound, comprising the following steps: dissolving diphenylphosphine halide in water, then adding an alkali metal salt to react and obtain a first reaction solution; dissolving an organohalide in an organic solvent to obtain a second reaction solution; adding the second reaction solution dropwise to the first reaction solution in the presence of a catalyst, and collecting the precipitate obtained from the reaction, which is the polyphenylphosphine oxide compound.

[0016] In an optional embodiment, the steps include: dissolving diphenyl phosphorus halide in water and heating to react, maintaining the reaction temperature and then adding an alkali metal salt to react, followed by adding a catalyst and mixing evenly to obtain a first reaction solution; dissolving an organic halide in an organic solvent to obtain a second reaction solution; then raising the temperature of the first reaction solution and, under the condition of heat preservation, adding the second reaction solution dropwise to the first reaction solution, and collecting the precipitate obtained from the reaction, which is a polyphenyl phosphorus oxide compound.

[0017] Currently, halogen-free flame retardants with higher flame retardant efficiency and better heat resistance are usually phosphorus-containing flame retardants. These flame retardants typically contain a more stable PC bond structure in their molecular structure, rather than the traditional POC bond. Polyphenylphosphine oxides have a stable PC bond structure and low dielectric properties. Furthermore, the molecular structure of polyphenylphosphine oxides is relatively symmetrical, resulting in relatively low dielectric properties. However, current one-pot synthesis processes result in low yields, numerous impurities in the product, and poor dielectric properties.

[0018] To address the aforementioned problems, this invention proposes a method for preparing polyphenylphosphine oxides. This method involves dissolving raw materials with different properties using two solvents, resulting in smaller particle sizes and a more thorough reaction. Adding a catalyst to the system promotes the transfer of reactants between the two phases, improving the yield and purity of the product. Higher product purity leads to better dielectric properties. This invention optimizes the selection of raw materials and process parameters to prepare polyphenylphosphine oxides with both good flame retardant properties and a low dielectric constant, significantly improving production yield compared to other methods.

[0019] The preparation system provided in this embodiment of the invention contains a dual solvent of organic solvent and water. The organic solvent is used to dissolve the organic halide, and the diphenyl phosphorus halide is dissolved in water. Since alkali metal salts are insoluble in organic solvents, a catalyst is added in this invention. The catalyst can increase the solubility of alkali metal salts in the system. After dissolution, the probability of intermolecular collisions of the reactants is greater, which is beneficial to improving the yield.

[0020] In an optional embodiment, the mass ratio of diphenylphosphine halide:water:alkali metal salt:organohalide is 2-5:0.2-2:0.1-4:1.

[0021] In an optional embodiment, the preparation of the first reaction solution includes: adding diphenylphosphine halide to water and heating to react, obtaining a solution containing intermediate product A; maintaining the reaction temperature and adding an alkali metal salt to react, obtaining a solution containing intermediate product B; and then adding a phase transfer catalyst and mixing thoroughly to obtain the final product, wherein:

[0022] Diphenyl phosphorus halide includes at least one of diphenyl phosphorus chloride and diphenyl phosphorus bromide, preferably diphenyl phosphorus chloride;

[0023] Alkali metal salts include at least one of sodium hydroxide, potassium hydroxide, lithium hydroxide, magnesium hydroxide, calcium hydroxide, and barium hydroxide, preferably sodium hydroxide or potassium hydroxide;

[0024] The catalyst includes at least one of benzyltriethylammonium chloride, tetrabutylammonium bromide, tetrabutylammonium chloride, tetrabutylammonium hydrogen sulfate, trioctylmethylammonium chloride, dodecyltrimethylammonium chloride, tetradecyltrimethylammonium chloride, 15-crown ether-5, 18-crown ether-6, and polyethylene glycol with a molecular weight less than 3000, preferably at least one of benzyltriethylammonium chloride, tetrabutylammonium bromide, tetrabutylammonium chloride, tetrabutylammonium hydrogen sulfate, trioctylmethylammonium chloride, 15-crown ether-5, 18-crown ether-6, polyethylene glycol 400, and polyethylene glycol 600.

[0025] The amount of the chemical agent is 0.1-5% of the total mass of the reactants, preferably 0.5-1.5%.

[0026] Preferably, diphenylphosphine halide is diphenylphosphine chloride, and the reaction equation for preparing intermediate product A is as follows:

[0027]

[0028] Preferably, diphenylphosphine halide is added to water and heated to 30-55°C to carry out the reaction; more preferably, diphenylphosphine halide is added to water and heated to 40-50°C to carry out the reaction.

[0029] Preferably, the alkali metal salt is sodium hydroxide, and the reaction equation for preparing intermediate product B is as follows:

[0030] .

[0031] In an optional embodiment, the preparation of the second reaction solution includes: dissolving the organic halide in an organic solvent to obtain the solution;

[0032] Preferably, the organohalide includes at least one of dichloromethane, dibromomethane, dichloroethane, dibromoethane, 1,3-dichloropropane, 1,3-dibromopropane, p-dichlorobenzyl, m-dichlorobenzyl, o-dichlorobenzyl, p-dibromobenzyl, m-dibromobenzyl, and o-dibromobenzyl, more preferably at least one of p-dichlorobenzyl and p-dibromobenzyl;

[0033] Preferably, the organic solvent is a water-miscible solvent, including at least one of tetrahydrofuran, DMF, DMSO, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol dipropyl ether, propylene glycol dimethyl ether, propylene glycol diethyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, dipropylene glycol dimethyl ether, dipropylene glycol diethyl ether, toluene, xylene, and trimethylbenzene. The amount of organic solvent used is 2-10 times the amount of organic halogenated substance.

[0034] In an optional embodiment, the preparation of the precipitate includes: raising the temperature of the first reaction solution to 55-85°C, and under the condition of heat preservation, adding the second reaction solution dropwise to the first reaction solution. After the organic halides in the mother liquor have reacted completely, the reaction is stopped and the solid precipitate obtained from the reaction is collected.

[0035] In an optional embodiment, the second reaction solution is added dropwise to the first reaction solution, and the reaction equation for preparing the polyphenylphosphine oxide is as follows:

[0036]

[0037] X is chlorine or bromine, and R is any one of C2-C3 alkyl groups, p-dimethylbenzene, m-dimethylbenzene, and o-dimethylbenzene.

[0038] Preferably, the temperature of the first reaction solution is raised to 55-85°C, more preferably to 55-70°C.

[0039] In an optional embodiment, R is p-dimethylbenzene. When R is p-dimethylbenzene, the delocalized large π bonds on the benzene ring make the electron pairs of the material more uniform, the material has good symmetry, and therefore its dielectric constant is low.

[0040] In an optional embodiment, the method further includes: filtering out the solid precipitate obtained from the reaction, washing it with water, drying it to obtain a crude product, and then crushing the crude product, washing it with water, drying it to obtain a polyphenylphosphine oxide compound.

[0041] This invention provides a method for preparing polyphenylphosphine oxides. During the preparation of polyphenylphosphine oxides, cations in alkaline substances combine with halogens to form inorganic salts, which are mixed into the polyphenylphosphine oxides. By crushing, the inorganic salts in the middle of the polyphenylphosphine oxides are exposed. By washing with water, the inorganic salts are removed to obtain the final product, which greatly improves the purity of the product.

[0042] Thirdly, embodiments of the present invention provide a material containing a polyphenylphosphine oxide compound, the material including at least one of nylon, polyester, epoxy resin, benzoxazine resin, polyphenylene ether resin and polyolefin resin.

[0043] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0044] Example 1

[0045] 27.6g of diphenylphosphine chloride was added to 8.9g of water, and the temperature was raised to 55℃. 16.5g of KOH solid was added to the above solution, and the reaction was carried out at a constant temperature of 55℃. Then 0.33g of polyethylene glycol 600 was added as a phase transfer catalyst, and the mixture was mixed evenly to obtain solution A.

[0046] 10g of benzyl dichloroethylene was added to a reaction flask and dissolved in 136g of ethylene glycol diethyl ether to obtain solution B;

[0047] The solution A system was heated to 68℃ and kept at a constant temperature. Solution B was added dropwise to solution A. The reaction of benzyl dichlorotri ...

[0048] Example 2

[0049] 27.6g of diphenylphosphine chloride was added to 8.9g of water, and the temperature was raised to 35℃. 16.5g of KOH solid was added to the above solution, and the reaction was carried out at a constant temperature of 35℃. Then 0.33g of tetrabutylammonium bromide was added as a phase transfer catalyst, and the mixture was mixed evenly to obtain solution A.

[0050] 10g of dichloroethane was added to the reaction flask, and 136g of tetrahydrofuran was added to dissolve it, resulting in solution B.

[0051] The solution A system was heated to 80℃ and kept at a constant temperature. Solution B was added dropwise to solution A. The reaction of benzyl dichlorotri ...

[0052] Example 3

[0053] 27.6g of diphenylphosphine chloride was added to 8.9g of water, and the temperature was raised to 40℃. 16.5g of KOH solid was added to the above solution, and the reaction was carried out at a constant temperature of 40℃. Then 0.33g of 18-crown ether-6 was added as a phase transfer catalyst, and the mixture was mixed evenly to obtain solution A.

[0054] 10g of o-dibromobenzyl was added to the reaction flask, and 136g of DMF was added to dissolve it, resulting in solution B.

[0055] The solution A system was heated to 55℃ and kept at a constant temperature. Solution B was added dropwise to solution A. The reaction of benzyl dichlorotri ...

[0056] Example 4

[0057] 27.6g of diphenylphosphine chloride was added to 8.9g of water, and the temperature was raised to 45℃. 16.5g of KOH solid was added to the above solution, and the reaction was carried out at a constant temperature of 45℃. Then 0.33g of polyethylene glycol 400 was added as a phase transfer catalyst, and the mixture was mixed evenly to obtain solution A.

[0058] 10g of 1,3-dichloropropane was added to the reaction flask, and 136g of toluene was added to dissolve it, yielding solution B;

[0059] The solution A system was heated to 68℃ and kept at a constant temperature. Solution B was added dropwise to solution A. The reaction of benzyl dichlorotri ...

[0060] Example 5

[0061] 20g of diphenylphosphine chloride was added to 4g of water and heated to 55℃. 10g of KOH solid was added to the above solution and the reaction was carried out at a constant temperature of 55℃. Then 0.2g of polyethylene glycol 600 was added as a phase transfer catalyst and the mixture was stirred evenly to obtain solution A.

[0062] 10g of 1,3-dichloropropane was added to the reaction flask, and 80g of ethylene glycol diethyl ether was added to dissolve it, resulting in solution B;

[0063] The solution A system was heated to 68℃ and kept at a constant temperature. Solution B was added dropwise to solution A. The reaction of benzyl dichlorotri ...

[0064] Example 6

[0065] 30g of diphenylphosphine chloride was added to 12g of water and heated to 55℃. 20g of KOH solid was added to the above solution and the reaction was carried out at a constant temperature of 55℃. Then 0.48g of polyethylene glycol 600 was added as a phase transfer catalyst and the mixture was stirred evenly to obtain solution A.

[0066] Add 10g of benzyl dichloroethylene to a reaction flask, then add 180g of ethylene glycol diethyl ether to dissolve it, to obtain solution B;

[0067] The temperature of solution A was raised to 62℃ and kept constant. Solution B was added dropwise to solution A. The reaction of benzyl dichlorotri ...

[0068] Comparative Example 1

[0069] 10g of p-dichlorobenzyl was added to the reaction flask, followed by 136g of DMF to dissolve it, then 27.6g of diphenylphosphine chloride and 16.5g of KOH solid were added. The flask was placed in a water bath and heated to 55°C with stirring. The reaction was observed by TLC to determine the reaction status of p-dichlorobenzyl in the mother liquor. After the reaction was complete, the reaction was terminated, and a solid product was obtained. The product was filtered, washed with water, and dried to obtain the final product.

[0070] Comparative Example 2

[0071] 27.6g of diphenylphosphine chloride was added to 8.9g of water, and the temperature was raised to 55℃. 16.5g of KOH solid was added to the above solution, and the reaction was carried out at a constant temperature of 55℃. After mixing evenly, solution A was obtained.

[0072] 10g of benzyl dichloroisocyanurate was added to the reaction flask and dissolved in 136g of DMF to obtain solution B.

[0073] The solution A system was heated to 60℃ and kept at a constant temperature. Solution B was added dropwise to solution A. The reaction of benzyl dichlorotri ...

[0074] Comparative Example 3

[0075] 27.6g of diphenylphosphine chloride was added to 8.9g of water, and the temperature was raised to 55℃. 16.5g of KOH solid was added to the above solution, and the reaction was carried out at a constant temperature of 55℃. Then 0.33g of benzyltriethylammonium chloride was added as a phase transfer catalyst, and the mixture was mixed evenly to obtain solution A.

[0076] 10g of benzyl dichloroethylene was added to a reaction flask and dissolved in 136g of ethylene glycol diethyl ether to obtain solution B;

[0077] The solution A system was heated to 60℃ and kept at a constant temperature. Solution B was added dropwise to solution A. The reaction of benzyl dichlorotri ...

[0078] Comparative Example 4

[0079] 8.9g of diphenylphosphine chloride was added to 25g of water and heated to 55℃. 0.5g of KOH solid was added to the above solution and the reaction was carried out at a constant temperature of 55℃. Then 0.33g of polyethylene glycol 400 was added as a phase transfer catalyst and the mixture was stirred evenly to obtain solution A.

[0080] 10g of benzyl dichloroethylene was added to a reaction flask and dissolved in 136g of ethylene glycol diethyl ether to obtain solution B;

[0081] The solution A system was heated to 60℃ and kept at a constant temperature. Solution B was added dropwise to solution A. The reaction of benzyl dichlorotri ...

[0082] Comparative Example 5

[0083] 62.5g of diphenylphosphine chloride was added to 8.9g of water, and the temperature was raised to 55℃. 41g of KOH solid was added to the above solution, and the reaction was carried out at a constant temperature of 55℃. Then 0.33g of polyethylene glycol 400 was added as a phase transfer catalyst, and the mixture was mixed evenly to obtain solution A.

[0084] 10g of benzyl dichloroethylene was added to a reaction flask and dissolved in 136g of ethylene glycol diethyl ether to obtain solution B;

[0085] The solution A system was heated to 60℃ and kept at a constant temperature. Solution B was added dropwise to solution A. The reaction of benzyl dichlorotri ...

[0086] The products obtained from Comparative Examples 1-5 and Examples 1-6 were subjected to the following tests:

[0087] 1: Yield

[0088] Yield = Solid product mass / Theoretical product mass, where the theoretical product mass is calculated from the amount of raw materials added;

[0089] 2: Purity Test:

[0090] Select the chromatographic system: Arc_HPLC_TUA, column temperature: 30 ℃, mobile phase: a mixture of ammonium acetate aqueous solution and acetonitrile, and test the purity of each component sample.

[0091] 3: Halogen ion test:

[0092] According to JY / T 0575-2020, the content of halide anions is determined by ion chromatography (IC).

[0093] 4. Product structure testing:

[0094] The molecular structure of the product can be determined by NMR. Weigh 100 mg of the sample, dissolve it in CDCl3, and take a sample for testing.

[0095] Table 1: Test Results of Polyphenylphosphine Oxides

[0096]

[0097] Using the product of Example 1 as an example, the 1H NMR spectrum was tested, such as... Figure 1 Test the phosphorus NMR spectrum, such as Figure 2 The results are in agreement with the theoretical values, proving that the target product was obtained in Example 1.

[0098] As can be seen from the data in Table 1:

[0099] Comparative Example 1, prepared by a one-pot method, had a low yield of only 80%, and the product contained a high content of halide ions, resulting in low purity. Comparative Example 2, although using a dual-solvent system, did not add a catalyst, hindering the reaction and thus lowering its yield compared to Comparative Example 1. In Comparative Example 2, the product underwent crushing and desalting, reducing the halide ion content compared to Comparative Example 1. Comparative Example 3 used benzyltriethylammonium chloride as a catalyst, and the product's properties were similar to Comparative Example 2. This demonstrates that the preparation method proposed in this invention is not applicable to all catalysts. The proportions of each component affect the product yield. In Comparative Examples 4 and 5, the reactant proportions were adjusted, but these proportions were outside the range proposed in this invention, resulting in extremely low reactant yields. Therefore, the optimal mass ratio of diphenylphosphine halide:water:alkali metal salt:organohalide is 2-5:0.2-2:0.1-4:1.

[0100] In Examples 1-6, a dual-solvent system was used, and a catalyst was added simultaneously, which significantly improved the yield. The yield of Example 1 was as high as 95%, with only 97.12 mg / kg of halide ions, and the product purity was high.

[0101] Application examples

[0102] The polyphenylphosphine oxides prepared in Examples 1-6 and Comparative Examples 1-5 were mixed with nylon 6 and glass fiber. The mixture of polyphenylphosphine oxide (20%), nylon 6 (50%), and glass fiber (30%) was extruded and granulated using a twin-screw extruder, and then injection molded to obtain standard specimens for testing relevant material properties. The main performance indicators of interest are as follows:

[0103] 1. Impact strength test

[0104] The notched impact strength of the simply supported beam was tested using ISO 179-1 for the prepared specimens.

[0105] 2. Tensile strength

[0106] For the prepared specimens, their tensile strength was tested in accordance with GB / T 1040.1-2018.

[0107] 3. Flame retardant properties

[0108] The obtained test strips were tested for their flame retardant properties using the UL-94 V0 (0.8 mm) method, with 5-6 test strips per group.

[0109] 4. Fracture morphology test

[0110] The prepared specimens were placed in liquid nitrogen and fractured, and the surface morphology of the fracture surface was observed under a microscope.

[0111] 5. Dielectric constant test:

[0112] According to GB / T1409-2006, the dielectric constant of the sample was tested using an LCR digital bridge at a frequency of 1MHz.

[0113] Table 2 Performance Tests of Polyphenylphosphide Nylon

[0114]

[0115] The data above show that Comparative Example 1 was a one-pot method, while Comparative Example 2, although a solvent-based dissolution method, resulted in the nylon sample failing the flame retardancy test when 20% of the polyphenylphosphine oxide product obtained without a catalyst was added to nylon. This is because the products of Comparative Examples 1 and 2 had low purity and few active ingredients, resulting in poor flame retardant performance. In Comparative Example 3, benzyltriethylammonium chloride was chosen as the catalyst, but the product's performance in nylon was poor, similar to that of Comparative Example 2 without a catalyst. This indicates that the preparation method proposed in this invention is not applicable to... For all catalysts; in Comparative Examples 4 and 5, the reactant ratios were not properly selected, resulting in poor performance of the products. After being added to nylon, the effect was very unsatisfactory. Comparing the dielectric constants, the dielectric constants of Examples 1-6 were significantly lower than that of Comparative Example 1. The dielectric constants of the products in Examples 1-6 were all less than 4.1, with the dielectric constant of Example 1 being only 2.8. It can be seen that when R is p-dimethylbenzene, the dielectric constant of the polyphenylphosphine oxide product is the lowest, followed by the linear alkyl polyphenylphosphine oxide with R being C3, with a dielectric constant of only 2.9.

[0116] Comparing the impact strength, tensile strength, flame retardant properties, and fracture morphology data of the nylon strips prepared from the products of the above groups, and comprehensively comparing the data of each group from Examples 1 to Examples 6, the nylon strip prepared from the polyphenylphosphine oxide obtained in Example 1 has the best performance.

[0117] As can be seen from the above, the embodiments of the present invention provide a method for preparing and applying polyphenylphosphine oxides. Using the scheme provided by the present invention, high-yield and high-purity polyphenylphosphine oxide products can be obtained. Compared with the performance test results and post-application material test results of the products in Example 1 and Comparative Examples 1-5, changing the reactants, ratios, or processes resulted in a decrease in various aspects of the product's performance. Therefore, the polyphenylphosphine oxide compounds prepared by the method provided in the embodiments of the present invention possess both good flame retardant properties and low dielectric constant, and are expected to be applied in various flame-retardant products, especially in 5G materials requiring low dielectric constant and high flame retardancy, where they can demonstrate their excellent flame-retardant properties.

[0118] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for producing a polyphenylphosphine oxide compound, characterized by, The method comprises the following steps: The diphenyl phosphine halide is dissolved in water and heated to react, the reaction temperature is kept, and then a base is added to react, and then a catalyst is added and uniformly mixed to obtain a first reaction solution; the organic halide is dissolved in an organic solvent to obtain a second reaction solution; the temperature of the first reaction solution is increased, and the second reaction solution is added dropwise into the first reaction solution under the condition of heat preservation, and then the solid precipitate obtained in the reaction is collected, filtered, washed with water, and dried to obtain a crude product, which is crushed, washed with water, and dried to obtain the polyphenyl phosphine oxide compound, wherein: The mass ratio of the diphenyl phosphine halide, water, the base, and the organic halide is 2-5:0.2-2:0.1-4:1; The base is at least one selected from sodium hydroxide, potassium hydroxide, lithium hydroxide, magnesium hydroxide, calcium hydroxide, and barium hydroxide; and the catalyst is at least one selected from tetrabutylammonium bromide, 15-crown-5, 18-crown-6, and polyethylene glycol with a molecular weight less than 3000, and the amount of the catalyst is 0.1-5% of the total mass of the reactants; The polyphenyl phosphine oxide compound has the following structural formula: R is any one of C2-C3 alkylene, p-xylylene, m-xylylene, o-xylylene; The preparation of the first reaction solution comprises the following steps: the diphenyl phosphine halide is added into water and heated to 30-55 DEG C to obtain a solution containing an intermediate product A; the reaction temperature is kept, and then a base is added to react to obtain a solution containing an intermediate product B; and then a catalyst is added and uniformly mixed to obtain the first reaction solution, wherein: The diphenyl phosphine halide is at least one selected from diphenyl phosphine chloride and diphenyl phosphine bromide; and the preparation of the second reaction solution comprises the following steps: the organic halide is dissolved in an organic solvent to obtain the second reaction solution, wherein the organic halide is at least one selected from dichloromethane, dibromomethane, dichloroethane, dibromoethane, 1,3-dichloropropane, 1,3-dibromopropane, p-dichlorobenzyl, m-dichlorobenzyl, o-dichlorobenzyl, p-dibromobenzyl, m-dibromobenzyl, and o-dibromobenzyl; The organic solvent is at least one selected from tetrahydrofuran, DMF, DMSO, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol dipropyl ether, propylene glycol dimethyl ether, propylene glycol diethyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, dipropylene glycol dimethyl ether, dipropylene glycol diethyl ether, toluene, xylene, and mesitylene, and the amount of the organic solvent is 2-10 times the mass of the organic halide.

2. The production method according to claim 1, characterized by, The diphenyl phosphine chloride is added into water and heated to 30-55 DEG C to obtain a solution containing an intermediate product A, and the reaction equation is as follows: The reaction temperature is kept, and then sodium hydroxide is continuously added into the solution containing the intermediate product A to react to obtain a solution containing an intermediate product B, and the reaction equation is as follows: 。 3. The preparation method according to claim 1, characterized in that, The preparation of the precipitate comprises the following steps: the temperature of the first reaction solution is increased to 55-85 DEG C, and the second reaction solution is added dropwise into the first reaction solution under the condition of heat preservation; after the organic halide in the mother liquor is observed to be completely reacted by TLC point plate observation, the reaction is ended; and then the solid precipitate obtained in the reaction is collected, which is used to prepare the polyphenyl phosphine oxide compound, and the reaction equation is as follows: X is chlorine or bromine and R is any one of C2-C3 alkylene, p-xylylene, m-xylylene, o-xylylene.

4. The production method according to claim 3, characterized by, R is p-xylylene.

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