High-toughness polyphenylene sulfide polymer alloy, high-toughness polyphenylene sulfide film and preparation methods of high-toughness polyphenylene sulfide polymer alloy and high-toughness polyphenylene sulfide film

Abstract

The invention relates to the field of polyphenylene sulfide materials, and particularly discloses a high-toughness polyphenylene sulfide polymer alloy, a high-toughness polyphenylene sulfide film and a preparation method of the high-toughness polyphenylene sulfide polymer alloy. The high-toughness polyphenylene sulfide polymer alloy comprises the following components in parts by weight: 50-90 parts of polyphenylene sulfide, 5-15 parts of a compatibilizer and 10-30 parts of a flexibilizer, the compatibilizer is glycidyl methacrylate; the flexibilizer is an amorphous polyether sulfone (ketone) polymer containing a flexible chain segment; the high-toughness polyphenylene sulfide film is prepared from high-toughness polyphenylene sulfide polymer alloy and has high thermal deformation temperature. The high-toughness polyphenylene sulfide film has the advantages of high strength and good toughness.

Description

Technical Field

[0001] The present application relates to the field of polyphenylene sulfide materials, and more specifically, to a high-toughness polyphenylene sulfide polymer alloy, a high-toughness polyphenylene sulfide film and a preparation method thereof. Background Art

[0002] Polyphenylene sulfide (PPS) is a polymer formed by alternating benzene rings and sulfur atoms. It is a semi-crystalline thermoplastic engineering polymer with excellent high-temperature stability, radiation resistance, high flame retardancy, high dimensional stability, good solvent resistance, and chemical corrosion resistance. It belongs to special engineering plastics. In the molecular structure of polyphenylene sulfide, phenylene rings and sulfur atoms are interspersed to form phenylthio groups. The conjugated structure of a large number of benzene rings gives PPS unique rigidity. The hyperconjugated structure formed by sulfur atoms and benzene rings in the sulfide bond makes PPS partially flexible. Such a molecular composition makes it have a certain fluidity, fast crystallization speed, and can be formed in a short period of time; good heat resistance, almost no quality loss due to thermal degradation; excellent corrosion resistance, at the same time, there are a large number of conjugated large π bonds in the macromolecular chain of polyphenylene sulfide, which makes PPS very excellent. Therefore, it is widely used in electronic and electrical, automotive, environmental protection, aerospace and other fields.

[0003] However, polyphenylene sulfide also has some disadvantages: high brittleness, poor toughness, low impact strength, and low heat deformation temperature. This may be because there are a large number of benzene rings in its macromolecular structure. At the same time, the benzene rings and sulfur atoms on its macromolecular chain are connected by σ bonds, and the bond energy is low. In a complex high-temperature environment, the σ bonds in the macromolecular chain are easily attacked by strong oxidizing gases and break to form free radicals, and then oxidative cross-linking, macromolecular chain breakage, degradation and other reactions occur, which causes a great degree of loss in the mechanical properties of polyphenylene sulfide, leading to material failure, shortened service life, reduced work efficiency, and further economic losses, which seriously affect the normal production of enterprises and limit the expansion of PPS application areas.

[0004] In view of the above problems, the present invention is committed to providing a high-toughness polyphenylene sulfide polymer alloy and a high-toughness polyphenylene sulfide film with high strength, good toughness and excellent impact resistance. Summary of the invention

[0005] In order to improve the toughness of a polyphenylene sulfide film, the present application provides a high-toughness polyphenylene sulfide polymer alloy, a high-toughness polyphenylene sulfide film and a preparation method thereof.

[0006] In the first aspect, the present application provides a high-toughness polyphenylene sulfide polymer alloy, which adopts the following technical solution:

[0007] A high-toughness polyphenylene sulfide polymer alloy comprises the following raw materials in parts by weight:

[0008] 50-90 parts of polyphenylene sulfide, 5-15 parts of compatibilizer, 10-30 parts of toughening agent;

[0009] The compatibilizer is glycidyl methacrylate;

[0010] The toughening agent is an amorphous polyarylethersulfone (ketone) polymer containing a flexible segment.

[0011] By adopting the above technical solution, glycidyl methacrylate is used as a compatibilizer. The glycidyl methacrylate molecule contains both a methacrylate group and an epoxy group. The epoxy group can undergo a ring-opening reaction with the thioether group (-S-) in PPS to form a covalent bond, and the methacrylate group can form a physical interaction with the benzene ring structure of PPS, thereby improving the interfacial compatibility. The glycidyl methacrylate molecules are interspersed between PPS molecules to improve the compatibility with the PPS material, and can affect the microscopic phase structure of PPS to form a more uniform phase distribution.

[0012] Amorphous poly(arylethersulfoneketone) polymer is used as a toughening agent. Its main chain structure contains flexible chain segments and is relatively flexible. When subjected to external force, a large number of flexible molecular structures in its molecular chain can absorb impact energy and improve toughness. In addition, the amorphous poly(arylethersulfoneketone) polymer can form intermolecular hydrogen bonds with the epoxy groups of glycidyl methacrylate to form a flexible cross-linked network that can absorb and disperse stress, thereby further playing a toughening role. At the same time, the amorphous poly(arylethersulfoneketone) polymer is interspersed in a PPS matrix containing glycidyl methacrylate, thereby making its heterogeneous nucleation ability more obvious, promoting the crystallization of PPS molecules, and further improving the toughness of the polyphenylene sulfide material.

[0013] In the present invention, polyphenylene sulfide, glycidyl methacrylate, and amorphous polyarylethersulfone (ketone) polymer work synergistically to improve the impact resistance and strength of the polymer alloy, improve the toughness of polyphenylene sulfide, and can be used to prepare polyphenylene sulfide films, which can greatly improve the strength, toughness and impact resistance of the film material.

[0014] Preferably, the preparation method of the toughening agent comprises the following steps:

[0015] After mixing bisphenol compounds and dihalogen compounds, add catalysts, water-carrying agents and organic solvents, heat to 140-170°C in an inert atmosphere to carry out water for 1-3 hours, and then heat to 180-220°C to react for 2-8 hours; then precipitate in a mixture of ethanol and water, and obtain an amorphous polyarylethersulfone(ketone) polymer through crushing, boiling, washing, filtering and drying.

[0016] Preferably, the bisphenol compound is one or more of bisphenol A, bisphenol S, phenolphthalein, and 3,3-bis(4-hydroxyphenyl)-2-phenylisoindolin-1-one.

[0017] Preferably, the dihalogen compound includes difluorobenzophenone and 4,4-difluorodiphenyl sulfone containing a soft segment.

[0018] Preferably, the molar ratio of the bisphenol compound to the dihalogen compound is 1: 1. Further preferably, the molar ratio of the bisphenol compound, the difluorobenzophenone containing a flexible segment and 4,4-difluorodiphenyl sulfone is 1:(0.2-0.8):(0.2-0.8).

[0019] Preferably, the molar ratio of the bisphenol compound, the difluorobenzophenone containing a flexible segment and 4,4-difluorodiphenyl sulfone is 1:0.2:0.8.

[0020] Preferably, the molar ratio of the bisphenol compound, the difluorobenzophenone containing a flexible segment and 4,4-difluorodiphenyl sulfone is 1:0.8:0.2.

[0021] Preferably, the bisphenol compound is 3,3-bis(4-hydroxyphenyl)-2-phenylisoindolin-1-one.

[0022] Preferably, the structural formula of the difluorobenzophenone containing a flexible segment is as follows:

[0023]

[0024] Preferably, the structural formula of the toughening agent is as follows:

[0025] m and n are the degree of polymerization.

[0026] By adopting the above technical solution, the difluorobenzophenone containing a flexible segment has a -CH2- flexible segment in its molecule, which promotes the tensile strength and elastic modulus of the polyphenylene sulfide film. As the number of flexible segments increases, the tensile strength of the polyphenylene sulfide film increases; at the same time, the introduction of the flexible segment reduces the viscosity of the polyphenylene sulfide polymer alloy, which is conducive to processing.

[0027] The reaction formula for synthesizing the toughening agent PEK-PPIBFB-co-PES-PPI using 3,3-bis(4-hydroxyphenyl)-2-phenylisoindolin-1-one (PPPBP), difluorobenzophenone (BFB) containing a flexible segment and 4,4-difluorodiphenyl sulfone (DFS) as raw materials is shown below:

[0028]

[0029] Preferably, the catalyst is selected from one or more of potassium carbonate, sodium carbonate, sodium bicarbonate, and potassium bicarbonate; and the molar ratio of the bisphenol compound to the catalyst is 1:(1.1-1.2).

[0030] Preferably, the organic solvent is selected from one or more of N-methylpyrrolidone, sulfolane, dimethyl sulfoxide, N,N-dimethylacetamide, and N,N-dimethylformamide; the molar volume ratio of the bisphenol compound to the organic solvent is (10-100):(10-100) (mmol / mL).

[0031] Preferably, the water-carrying agent is selected from one or more of toluene, xylene, and n-hexane, and the molar volume ratio of the bisphenol compound to the water-carrying agent is 1:(1-1.5) (mol / ml).

[0032] Preferably, the compatibilizer is selected from one or more of glycidyl methacrylate BF-2B, glycidyl methacrylate BF-7B, glycidyl methacrylate BF-7L, and glycidyl methacrylate BF-7M.

[0033] In the second aspect, the present application provides a high-toughness polyphenylene sulfide film, which adopts the following technical solution:

[0034] A high-toughness polyphenylene sulfide film is made from the high-toughness polyphenylene sulfide polymer alloy.

[0035] In a third aspect, the present application provides a method for preparing a high-toughness polyphenylene sulfide film, using the following technical solution:

[0036] A method for preparing a high-toughness polyphenylene sulfide film comprises the following steps:

[0037] According to the proportion, polyphenylene sulfide, a compatibilizer and a toughening agent are uniformly mixed, and melt-extruded to obtain a high-toughness polyphenylene sulfide polymer alloy;

[0038] After film pressing and cooling, a high-toughness polyphenylene sulfide polymer alloy film is obtained.

[0039] Preferably, the preparation method of the high-toughness polyphenylene sulfide polymer alloy comprises:

[0040] The polyphenylene sulfide, the compatibilizer and the toughening agent are mixed for 10-20 minutes by a one-step extrusion process, and then melt-extruded at 300-350° C. to obtain a high-toughness polyphenylene sulfide polymer alloy.

[0041] Preferably, the preparation method of the high-toughness polyphenylene sulfide polymer alloy comprises:

[0042] A two-step extrusion process is adopted to mix polyphenylene sulfide and a compatibilizer for 5-10 minutes, and then a toughening agent is added and mixed for 5-10 minutes, and the mixture is melt-extruded at 300-350° C. to obtain a high-toughness polyphenylene sulfide polymer alloy.

[0043] Preferably, the temperature of the die is 300-350°C, and the pressure is 5-10 MPa; the temperature of the cooling step is 10-25°C.

[0044] In summary, this application has the following beneficial effects:

[0045] 1. Due to the synergistic effect between the polyphenylene sulfide, glycidyl methacrylate, and amorphous polyarylethersulfone (ketone) polymer of the present invention, the impact resistance and strength of the polymer alloy are improved, the toughness of polyphenylene sulfide is improved, and it can be used to prepare polyphenylene sulfide films, which can greatly improve the strength, toughness and impact resistance of the film material.

[0046] 2. In the present application, the difluorobenzophenone containing a flexible segment has a -CH2- flexible segment in its molecule, which promotes the tensile strength and elastic modulus of the polyphenylene sulfide film. As the number of flexible segments increases, the tensile strength of the polyphenylene sulfide film increases; at the same time, the introduction of the flexible segment reduces the viscosity of the polyphenylene sulfide polymer alloy, which is conducive to processing.

[0047] 3. In the present application, the molar ratio of the bisphenol compound, difluorobenzophenone containing a flexible segment and difluorodiphenyl sulfone is limited to 1:(0.2-0.8):(0.2-0.8), which can make the toughness and strength of the polyphenylene sulfide polymer alloy better. DETAILED DESCRIPTION

[0048] To further help understand the technical solution of the present invention, the technical solution of the present invention is described in more detail below by providing several specific implementation examples. All of these described embodiments are only partial embodiments of the present invention, not all of them.

[0049] The following specific embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments; and the reaction devices, monomer compounds, etc. involved in the following embodiments are all commercially available.

[0050] In the following examples, the CAS number of 3,3-bis(4-hydroxyphenyl)-2-phenylisoindolin-1-one is 6607-41-6, the CAS number of difluorobenzophenone containing a soft segment is 108791-65-7; the CAS number of 4,4-difluorodiphenyl sulfone is 383-29-9; the CAS number of potassium carbonate is 584-08-7; the CAS number of toluene is 108-88-3; and the CAS number of sulfolane is 126-33-0.

[0051] The following specific embodiments may be combined with each other, and the same or similar concepts or processes therein may not be described in detail in some embodiments.

[0052] The following examples are further explanations of the present invention, but the present invention is not limited thereto. Unless otherwise specified in the examples, the percentages are all by mass.

[0053] Example

[0054] Example 1

[0055] This embodiment discloses a high-toughness polyphenylene sulfide polymer alloy and a high-toughness polyphenylene sulfide film made from the high-toughness polyphenylene sulfide polymer alloy. The preparation method is as follows:

[0056] (1) Preparation of toughening agent

[0057] 11.8029 g (about 0.030 mol) of 3,3-bis(4-hydroxyphenyl)-2-phenylisoindolin-1-one, 1.6454 g (about 0.006 mol) of difluorobenzophenone containing a flexible segment, and 6.1024 g (about 0.024 mol) of 4,4-difluorodiphenyl sulfone were mixed and put into a reaction bottle, and then 4.7679 g of potassium carbonate, 45 ml of toluene, and 43.655 ml of cyclopentane sulfone were added; the mixture was heated to 140° C. for 2 h under a nitrogen atmosphere to remove water generated during the reaction, and then the temperature was raised to 160° C. for 40 min to remove all toluene; the temperature was then raised to 200° C. and reacted for 2 h;

[0058] 30 mol N, N-dimethylacetamide was added to the reaction bottle for dilution. After stirring evenly, the mixed system was poured into an ethanol aqueous solution (ethanol: water = 3:1 (v / v)), the precipitate was separated, crushed, repeatedly boiled and washed with deionized water for 8 times, filtered, dried in a blast oven at 150°C for 12 h, and then vacuum dried at 150°C for 24 h to obtain the toughening agent PEK-PPIBFB-co-PES-PPI.

[0059] (2) Preparation of high-toughness polyphenylene sulfide polymer alloy

[0060] By using a one-step extrusion process, 56 parts by mass of polyphenylene sulfide, 14 parts by mass of a compatibilizer, and 30 parts by mass of PEK-PPIBFB-co-PES-PPI prepared in this embodiment were blended for 14 minutes and then melt-extruded at 320° C. to obtain a high-toughness polyphenylene sulfide polymer alloy.

[0061] In this embodiment, the model of polyphenylene sulfide is Q508; in other embodiments, polyphenylene sulfide can be prepared, including but not limited to sodium sulfide method and sulfur solution method, or can be commercially available, including but not limited to Q508, KJ160, 3418P, 3518P, etc. In this embodiment, glycidyl methacrylate BF-7L.

[0062] (3) Preparation of high-toughness polyphenylene sulfide film

[0063] The high-toughness polyphenylene sulfide polymer alloy prepared in this embodiment was put into a film pressing machine for compression molding. The film pressing temperature was 320° C. and the pressure was 10 MPa. The alloy was deflated four times to obtain a high-toughness polyphenylene sulfide film.

[0064] The polyphenylene sulfide film prepared in the example was tested, and the results showed that the impact strength of the polyphenylene sulfide film was 0.526 J, the elongation at break was 18.204%, the tensile strength was 22.14 MPa, and the elastic modulus was 1.33 GPa.

[0065] Example 2

[0066] The difference between this embodiment and embodiment 1 is that the preparation method of the high-toughness polyphenylene sulfide polymer alloy and the high-toughness polyphenylene sulfide film is as follows:

[0067] (1) Preparation of toughening agent

[0068] 11.8022 g (about 0.030 mol) of 3,3-bis(4-hydroxyphenyl)-2-phenylisoindolin-1-one, 6.5827 g (about 0.024 mol) of difluorobenzophenone containing a flexible segment, and 1.5252 g (about 0.006 mol) of 4,4-difluorodiphenyl sulfone were mixed and put into a reaction bottle, and then 4.7688 g of potassium carbonate, 45 ml of toluene, and 44.5123 ml of cyclopentane sulfone were added; the mixture was heated to 140° C. for 2 h under a nitrogen atmosphere to remove water generated during the reaction, and then the temperature was raised to 160° C. for 40 min to remove all toluene; the temperature was then raised to 200° C. and reacted for 2 h;

[0069] 30 mol N, N-dimethylacetamide was added to the reaction bottle for dilution. After stirring evenly, the mixed system was poured into an ethanol aqueous solution (ethanol: water = 3:1 (v / v)), the precipitate was separated, crushed, repeatedly boiled and washed with deionized water for 8 times, filtered, dried in a blast oven at 150°C for 12 h, and then vacuum dried at 150°C for 24 h to obtain the toughening agent PEK-PPIBFB-co-PES-PPI.

[0070] (2) Preparation of high-toughness polyphenylene sulfide polymer alloy

[0071] By using a one-step extrusion process, 56 parts by mass of polyphenylene sulfide, 14 parts by mass of glycidyl methacrylate BF-7L, and 30 parts by mass of PEK-PPIBFB-co-PES-PPI prepared in this example were blended for 14 minutes and then melt-extruded at 320° C. to obtain a high-toughness polyphenylene sulfide polymer alloy.

[0072] (3) Preparation of high-toughness polyphenylene sulfide film

[0073] The high-toughness polyphenylene sulfide polymer alloy prepared in this embodiment was put into a film pressing machine for compression molding. The film pressing temperature was 320° C. and the pressure was 10 MPa. The alloy was deflated four times to obtain a high-toughness polyphenylene sulfide film.

[0074] The polyphenylene sulfide film prepared in the example was tested, and the results showed that the impact strength of the polyphenylene sulfide film was 0.493 J, the elongation at break was 17.523%, the tensile strength was 27.26 MPa, and the elastic modulus was 1.42 GPa.

[0075] Example 3

[0076] The difference between this embodiment and embodiment 1 is that the preparation method of the high-toughness polyphenylene sulfide polymer alloy and the high-toughness polyphenylene sulfide film is as follows:

[0077] (1) Preparation of toughening agent

[0078] 11.8029 g (about 0.030 mol) of 3,3-bis(4-hydroxyphenyl)-2-phenylisoindolin-1-one, 1.6454 g (about 0.006 mol) of difluorobenzophenone containing a flexible segment, and 6.1024 g (about 0.024 mol) of 4,4-difluorodiphenyl sulfone were mixed and put into a reaction bottle, and then 4.7679 g of potassium carbonate, 45 ml of toluene, and 43.655 ml of cyclopentane sulfone were added; the mixture was heated to 140° C. for 2 h under a nitrogen atmosphere to remove water generated during the reaction, and then the temperature was raised to 160° C. for 40 min to remove all toluene; the temperature was then raised to 200° C. and reacted for 2 h;

[0079] 30 mol N, N-dimethylacetamide was added to the reaction bottle for dilution. After stirring evenly, the mixed system was poured into an ethanol aqueous solution (ethanol: water = 3:1 (v / v)), the precipitate was separated, crushed, repeatedly boiled and washed with deionized water for 8 times, filtered, dried in a blast oven at 150°C for 12 h, and then vacuum dried at 150°C for 24 h to obtain the toughening agent PEK-PPIBFB-co-PES-PPI.

[0080] (2) Preparation of high-toughness polyphenylene sulfide polymer alloy

[0081] A two-step extrusion process was adopted, 56 parts by mass of polyphenylene sulfide and 14 parts by mass of glycidyl methacrylate BF-7L were put into an extruder, blended for 7 minutes, and then 30 parts by mass of PEK-PPIBFB-co-PES-PPI prepared in this embodiment were added and blended for 7 minutes. The mixture was melt-extruded at 320°C to obtain a high-toughness polyphenylene sulfide polymer alloy.

[0082] (3) Preparation of high-toughness polyphenylene sulfide film

[0083] The high-toughness polyphenylene sulfide polymer alloy prepared in this embodiment was put into a film pressing machine for compression molding. The film pressing temperature was 320° C. and the pressure was 10 MPa. The alloy was deflated four times to obtain a high-toughness polyphenylene sulfide film.

[0084] The polyphenylene sulfide film prepared in the example was tested, and the results showed that the impact strength of the polyphenylene sulfide film was 1.015 J, the elongation at break was 22.164%, the tensile strength was 23.40 MPa, and the elastic modulus was 1.22 GPa.

[0085] Example 4

[0086] The difference between this embodiment and embodiment 1 is that the preparation method of the high-toughness polyphenylene sulfide polymer alloy and the high-toughness polyphenylene sulfide film is as follows:

[0087] (1) Preparation of toughening agent

[0088] 11.8022 g (about 0.030 mol) of 3,3-bis(4-hydroxyphenyl)-2-phenylisoindolin-1-one, 6.5827 g (about 0.024 mol) of difluorobenzophenone containing a flexible segment, and 1.5252 g (about 0.006 mol) of 4,4-difluorodiphenyl sulfone were mixed and put into a reaction bottle, and then 4.7688 g of potassium carbonate, 45 ml of toluene, and 44.5123 ml of cyclopentane sulfone were added; the mixture was heated to 140° C. for 2 h under a nitrogen atmosphere to remove water generated during the reaction, and then the temperature was raised to 160° C. for 40 min to remove all toluene; the temperature was then raised to 200° C. and reacted for 2 h;

[0089] 30 mol N, N-dimethylacetamide was added to the reaction bottle for dilution. After stirring evenly, the mixed system was poured into an ethanol aqueous solution (ethanol: water = 3:1 (v / v)), the precipitate was separated, crushed, repeatedly boiled and washed with deionized water for 8 times, filtered, dried in a blast oven at 150°C for 12 h, and then vacuum dried at 150°C for 24 h to obtain the toughening agent PEK-PPIBFB-co-PES-PPI.

[0090] (2) Preparation of high-toughness polyphenylene sulfide polymer alloy

[0091] A two-step extrusion process was adopted, 56 parts by mass of polyphenylene sulfide and 14 parts by mass of glycidyl methacrylate BF-7L were put into an extruder, blended for 7 minutes, and then 30 parts by mass of PEK-PPIBFB-co-PES-PPI prepared in this embodiment were added and blended for 7 minutes. The mixture was melt-extruded at 320°C to obtain a high-toughness polyphenylene sulfide polymer alloy.

[0092] (3) Preparation of high-toughness polyphenylene sulfide film

[0093] The high-toughness polyphenylene sulfide polymer alloy prepared in this embodiment was put into a film pressing machine for compression molding. The film pressing temperature was 320° C. and the pressure was 10 MPa. The alloy was deflated four times to obtain a high-toughness polyphenylene sulfide film.

[0094] The polyphenylene sulfide film prepared in the example was tested, and the results showed that the impact strength of the polyphenylene sulfide film was 0.145 J, the elongation at break was 2.263%, the tensile strength was 44.69 MPa, and the elastic modulus was 2.35 GPa.

[0095] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A high-toughness polyphenylene sulfide polymer alloy, characterized in that: Including the following raw materials in parts by weight: 50-90 parts of polyphenylene sulfide, 5-15 parts of compatibilizer, 10-30 parts of toughening agent; The compatibilizer is glycidyl methacrylate; The toughening agent is an amorphous polyarylethersulfone (ketone) polymer containing a flexible segment.

2. The high-toughness polyphenylene sulfide polymer alloy according to claim 1, characterized in that: The preparation method of the toughening agent comprises the following steps: After mixing bisphenol compounds and dihalogen compounds, adding catalysts, water-carrying agents and organic solvents, heating to 140-170°C in an inert atmosphere to carry water for 1-3 hours, and then heating to 180-220°C to react for 2-8 hours; then precipitating in a mixture of ethanol and water, crushing, boiling, washing, filtering and drying to obtain an amorphous polyarylethersulfone(ketone) polymer; The bisphenol compound is selected from one or more of bisphenol A, bisphenol S, phenolphthalein, and 3,3-bis(4-hydroxyphenyl)-2-phenylisoindolin-1-one; the dihalogen compound includes difluorobenzophenone containing a flexible segment and 4,4-difluorodiphenyl sulfone; and the molar ratio of the bisphenol compound, difluorobenzophenone containing a flexible segment, and 4,4-difluorodiphenyl sulfone is 1:(0.2-0.8):(0.2-0.8).

3. The high-toughness polyphenylene sulfide polymer alloy according to claim 2, characterized in that: The bisphenol compound is 3,3-bis(4-hydroxyphenyl)-2-phenylisoindolin-1-one.

4. The high-toughness polyphenylene sulfide polymer alloy according to claim 2, characterized in that: The structural formula of the difluorobenzophenone containing a flexible segment is shown below:

5. The high-toughness polyphenylene sulfide polymer alloy according to claim 2, characterized in that: The catalyst is selected from one or more of potassium carbonate, sodium carbonate, sodium bicarbonate, and potassium bicarbonate; the molar ratio of the bisphenol compound to the catalyst is 1:(1.1-1.2).

6. The high-toughness polyphenylene sulfide polymer alloy according to claim 2, characterized in that: The organic solvent is selected from one or more of N-methylpyrrolidone, cyclopentane, dimethyl sulfoxide, N,N-dimethylacetamide, and N,N-dimethylformamide; the molar volume ratio of the bisphenol compound to the organic solvent is (10-100):(10-100) (mmol / mL).

7. The high-toughness polyphenylene sulfide polymer alloy according to claim 2, characterized in that: The water-carrying agent is selected from one or more of toluene, xylene, and n-hexane, and the molar volume ratio of the bisphenol compound to the water-carrying agent is 1:(1-1.5) (mol / ml).

8. The high-toughness polyphenylene sulfide polymer alloy according to claim 1, characterized in that: The structural formula of the toughening agent is as follows: m and n are the degree of polymerization.

9. A high-toughness polyphenylene sulfide film, characterized in that: The invention is made from the high-toughness polyphenylene sulfide polymer alloy as described in any one of claims 1 to 8.

10. A method for preparing a high-toughness polyphenylene sulfide film as claimed in claim 9, characterized in that: The following steps are involved: According to the proportion, polyphenylene sulfide, a compatibilizer and a toughening agent are uniformly mixed, and melt-extruded to obtain a high-toughness polyphenylene sulfide polymer alloy; After lamination or casting and cooling, a high-toughness polyphenylene sulfide film is obtained.

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