Coating material for photosensitive drum transfer

Abstract

The present invention relates to a coating material for photosensitive drum transfer, which comprises the following components calculated by weight: 15-35 parts of polycarbonate resin, 8-16 parts of modified polyimide resin, 10-20 parts of organic charge transport material, 0.5-1.5 parts of antioxidant and 100 parts of organic solvent. The present invention prepares a coating material for photosensitive drum transfer, wherein the base resin is polycarbonate resin, an organic charge transport material is added to realize directional and orderly migration of carriers, a modified polyimide resin is added as a modified reinforcing filler to enhance the wear resistance of the coating material, and an antioxidant is added to enhance the anti-aging performance of the coating material.

Description

Technical Field

[0001] The invention relates to the field of photosensitive drums, and in particular to a coating material used for photosensitive drum transfer. Background Art

[0002] Organic photosensitive drums are a new type of high-tech information processing device that can generate carriers under laser irradiation and form and migrate. They are the core photoelectric conversion and imaging components in modern office equipment such as laser printers, digital copiers, laser fax machines and multi-function printers. They directly determine the quality of image transmission such as printing and copying. They are highly integrated, high-value-added organic optoelectronic information products that integrate modern functional materials and modern advanced manufacturing technologies.

[0003] Organic photosensitive drums are mainly composed of a cylindrical aluminum substrate and an organic photosensitive material coated on the surface of the substrate; among them, the organic photosensitive material is mainly composed of resin and functional materials. At present, most of the outer film-forming resins of photosensitive drums are polycarbonate resins and polyester resins. With the advancement and development of technology, users have higher and higher requirements for printing quality, such as resolution, clarity, color saturation, etc. This makes manufacturers constantly research new methods and improve products to meet and meet customer requirements, such as finer toner particles, faster paper output, and longer service life of printer components. Toner with smaller particle size can improve resolution and clarity, but it is also easy to cause incomplete cleaning of the scraper. Especially when the photosensitive drum coating is scratched or running at high speed, the extremely fine toner will leak out from the gap between the scraper and the photosensitive drum coating, causing defects such as printing fine lines or bottom ash.

[0004] Existing research shows that the wear resistance of the photosensitive drum coating can be increased to meet the requirements of finer carbon powder particle size and extend the life of the drum core. Among them, the most common method is to improve the wear resistance of the coating through resin modification and wear-resistant additives. One method can achieve a certain effect by adding silicone to the repeating unit of the polymer resin, but the silicone unit is easy to generate bubbles when added to the coating liquid, which is easy to cause bubble defects during the photosensitive drum manufacturing process. The second method is to add wear-resistant additives to the formula to achieve a certain wear resistance enhancement, but the wear-resistant additives are easy to change the carrier transport property of the coating, and are prone to sedimentation and unevenness. Summary of the invention

[0005] In view of the problems existing in the prior art, an object of the present invention is to provide a coating material for photosensitive drum transfer.

[0006] The purpose of the present invention is achieved by the following technical solutions:

[0007] In a first aspect, the present invention provides a coating material for photosensitive drum transfer, which comprises the following components in parts by weight:

[0008] 15-35 parts of polycarbonate resin, 8-16 parts of modified polyimide resin, 10-20 parts of organic charge transport material, 0.5-1.5 parts of antioxidant and 100 parts of organic solvent.

[0009] Preferably, the density of the polycarbonate resin is 1.21 g / cm 3 , the melt index is 22.g / 10min (300℃, 2.16kg).

[0010] Preferably, the preparation method of the modified polyimide resin comprises:

[0011] S1. Preparation of aminated rhenium diselenide:

[0012] ReSe2 powder and anhydrous ethanol are mixed and refluxed for 1-2 hours, and then the ethanol is removed and dried to obtain M-ReSe2. Then M-ReSe2 and KH-550 are mixed in deionized water, stirred at 50-60°C for 4-8 hours, and then the liquid is filtered out, washed three times with water and dried to obtain NH2-ReSe2.

[0013] Among them, the mass ratio of ReSe2 powder and anhydrous ethanol is 1:10-20; the mass ratio of M-ReSe2, KH-550 and deionized water is 1:0.2-0.3:10-20;

[0014] S2. Preparation of modified polyamic acid:

[0015] Weigh NH2-ReSe2 and 2,5-di(aminomethyl)furan separately and mix them into N-methylpyrrolidone. Stir mechanically at room temperature until they are evenly dispersed. Then gradually add hexafluorodianhydride within 1 hour. After complete addition, continue stirring for 12-24 hours under nitrogen protection. After the reaction is completed, a modified polyamic acid solution is obtained.

[0016] Wherein, the mass ratio of hexafluorodianhydride, NH2-ReSe2, 2,5-di(aminomethyl)furan and N-methylpyrrolidone is 0.44-0.88:0.12-0.24:0.09-0.18:10-20;

[0017] S3, preparing modified polyimide resin:

[0018] Pyridine and acetic anhydride are sequentially added as catalysts to the modified polyamic acid solution, and after being stirred evenly, the mixture is stirred in an oil bath pot at 75-95° C. for reaction for 10-15 hours. After the reaction is completed, the mixture is cooled to room temperature, and then the reaction solution is discharged into ethanol, and the solid is filtered and collected, and the solid is washed three times with distilled water and ethanol in sequence, and vacuum dried to obtain a modified polyimide resin;

[0019] The mass ratio of pyridine, acetic anhydride and modified polyamic acid solution is 0.6-1.2:1-2:10-20; and the ethanol used for discharging is 1-2 times the volume of the reaction solution.

[0020] Preferably, the organic charge transport material is poly-3,4-ethylenedioxythiophene (PEDOT) or 2,2',7,7'-tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9'-spirobifluorene (Spiro-OMeTAD).

[0021] Preferably, the antioxidant is one of antioxidant 4010NA, antioxidant 2246, antioxidant 405, antioxidant 4010, and antioxidant 4020.

[0022] Preferably, the organic solvent is one of dichloromethane, chloroform and 1,2-dichloroethane.

[0023] In a second aspect, the present invention provides a method for preparing a coating material for photosensitive drum transfer, comprising the following steps:

[0024] (1) Weighing a polycarbonate resin according to amount and dissolving it in an organic solvent, sequentially adding a modified polyimide resin, an organic charge transport material and an antioxidant, and stirring them thoroughly to form a coating for photosensitive drum transfer;

[0025] (2) coating the coating material for photosensitive drum transfer on the surface of the photosensitive drum transfer base layer with a coating thickness of 20-40 μm, and drying the coating material for photosensitive drum transfer.

[0026] The beneficial effects of the present invention are:

[0027] 1. The present invention prepares a coating material for photosensitive drum transfer, wherein the base resin is a polycarbonate resin, an organic charge transport material is added to realize the directional and orderly migration of carriers, an antioxidant is added to enhance the aging resistance of the coating material, and a modified polyimide resin is added as a modified reinforcing filler to enhance the wear resistance of the coating material.

[0028] 2. The modified polyimide resin prepared by the present invention is used as an additive modifier in the coating material, which not only improves the defect of insufficient wear resistance of the polycarbonate resin, but also can enhance a certain hole transport effect, thereby enhancing the energy conversion efficiency of the coating material.

[0029] 3. The present invention prepares the modified polyimide resin by a two-step method. The first step is to use amination of rhenium diselenide and 2,5-bis(aminomethyl)furan as ammonia sources and hexafluorodianhydride as an acid anhydride source, and fully stir at low temperature to obtain modified polyamic acid; the second step is to use pyridine and acetic anhydride as catalysts, and fully react under elevated temperature conditions to obtain the modified polyimide resin.

[0030] 4. The uniqueness of the present invention lies in that the ammonia source for synthesizing modified polyimide resin is different from conventional amine compounds. There are two types of amine sources used in the present invention: the first amine source is 2,5-bis(aminomethyl)furan containing a diamino group and a furanyl group, and the diamino group can react with a dianhydride to generate polyamic acid; the second amine source is rhenium diselenide after an amination treatment. As a semiconductor material, rhenium diselenide itself has a good hole transport effect. After an amination treatment, it can participate in the synthesis reaction of polyimide, thereby being evenly dispersed in the polyimide to enhance the performance of the polyimide. DETAILED DESCRIPTION

[0031] The technical solution of the present invention is described below through specific examples. It should be understood that the one or more method steps mentioned in the present invention do not exclude the existence of other method steps before and after the combination step or the insertion of other method steps between these explicitly mentioned steps; it should also be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. Moreover, unless otherwise specified, the numbering of each method step is only a convenient tool for identifying each method step, and is not intended to limit the order of arrangement of each method step or to limit the scope of the present invention. The change or adjustment of the relative relationship thereof shall also be regarded as the scope of the present invention without substantially changing the technical content.

[0032] In order to better understand the above technical scheme, the exemplary embodiments of the present invention are described in more detail below. Although exemplary embodiments of the present invention are shown, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0033] The present invention will be further described below in conjunction with the following examples.

[0034] Example 1

[0035] A coating material for photosensitive drum transfer, calculated by parts by weight, comprising the following components:

[0036] 25 parts of polycarbonate resin, 12 parts of modified polyimide resin, 15 parts of organic charge transport material, 1 part of antioxidant and 100 parts of organic solvent.

[0037] Wherein, the density of the polycarbonate resin is 1.21 g / cm 3, the melt index is 22.g / 10min (300℃, 2.16kg); the organic charge transport material is 2,2',7,7'-tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9'-spirobifluorene (Spiro-OMeTAD); the antioxidant is antioxidant 4010NA; and the organic solvent is dichloromethane.

[0038] Wherein, the preparation method of the modified polyimide resin comprises:

[0039] S1. Preparation of aminated rhenium diselenide:

[0040] ReSe2 powder and anhydrous ethanol were mixed and refluxed for 1 hour, and then the ethanol was removed and dried to obtain M-ReSe2. Then M-ReSe2 and KH-550 were mixed in deionized water, stirred at 55°C for 6 hours, and then the liquid was filtered out, washed three times with water and dried to obtain NH2-ReSe2.

[0041] Among them, the mass ratio of ReSe2 powder and anhydrous ethanol is 1:15; the mass ratio of M-ReSe2, KH-550 and deionized water is 1:0.25:15;

[0042] S2. Preparation of modified polyamic acid:

[0043] Weigh NH2-ReSe2 and 2,5-di(aminomethyl)furan separately and mix them into N-methylpyrrolidone. Under room temperature, mechanically stir until they are evenly dispersed. Then gradually add hexafluorodianhydride within 1 hour. After complete addition, continue stirring for 18 hours under nitrogen protection. After the reaction is completed, a modified polyamic acid solution is obtained.

[0044] Wherein, the mass ratio of hexafluorodianhydride, NH2-ReSe2, 2,5-di(aminomethyl)furan and N-methylpyrrolidone is 0.66:0.18:0.13:15;

[0045] S3, preparing modified polyimide resin:

[0046] Pyridine and acetic anhydride were sequentially added as catalysts to the modified polyamic acid solution, and after being stirred evenly, the mixture was stirred in an oil bath at 85° C. for 12 h. After the reaction was completed, the mixture was cooled to room temperature, and then the reaction solution was discharged into 1.5 times the volume of ethanol, and the solid was filtered and collected. The solid was washed three times with distilled water and ethanol in sequence, and vacuum dried to obtain a modified polyimide resin.

[0047] Wherein, the mass ratio of pyridine, acetic anhydride and modified polyamic acid solution is 0.9:1.5:15.

[0048] The method for preparing the coating material for photosensitive drum transfer comprises the following steps:

[0049] (1) Weighing a polycarbonate resin according to amount and dissolving it in an organic solvent, sequentially adding a modified polyimide resin, an organic charge transport material and an antioxidant, and stirring them thoroughly to form a coating for photosensitive drum transfer;

[0050] (2) The coating material for photosensitive drum transfer is coated on the surface of the photosensitive drum transfer base layer with a coating thickness of 30 μm. After drying, a coating material for photosensitive drum transfer is obtained.

[0051] Example 2

[0052] A coating material for photosensitive drum transfer, calculated by parts by weight, comprising the following components:

[0053] 15 parts of polycarbonate resin, 8 parts of modified polyimide resin, 10 parts of organic charge transport material, 0.5 parts of antioxidant and 100 parts of organic solvent.

[0054] Wherein, the density of the polycarbonate resin is 1.21 g / cm 3 , the melt index is 22.g / 10min (300℃, 2.16kg); the organic charge transport material is poly-3,4-ethylenedioxythiophene (PEDOT); the antioxidant is antioxidant 2246; and the organic solvent is chloroform.

[0055] Wherein, the preparation method of the modified polyimide resin comprises:

[0056] S1. Preparation of aminated rhenium diselenide:

[0057] ReSe2 powder (particle size 200±20nm) and anhydrous ethanol were mixed and refluxed for 1 hour, and then the ethanol was removed and dried to obtain M-ReSe2. Then M-ReSe2 and KH-550 were mixed in deionized water, stirred at 50°C for 4 hours, and then the liquid was filtered out, washed three times with water and dried to obtain NH2-ReSe2.

[0058] Among them, the mass ratio of ReSe2 powder and anhydrous ethanol is 1:10; the mass ratio of M-ReSe2, KH-550 and deionized water is 1:0.2:10;

[0059] S2. Preparation of modified polyamic acid:

[0060] Weigh NH2-ReSe2 and 2,5-di(aminomethyl)furan separately and mix them into N-methylpyrrolidone. Under room temperature, mechanically stir until they are evenly dispersed. Then gradually add hexafluorodianhydride within 1 hour. After complete addition, continue stirring for 12 hours under nitrogen protection. After the reaction is completed, a modified polyamic acid solution is obtained.

[0061] Wherein, the mass ratio of hexafluorodianhydride, NH2-ReSe2, 2,5-di(aminomethyl)furan and N-methylpyrrolidone is 0.44:0.12:0.09:10;

[0062] S3, preparing modified polyimide resin:

[0063] Pyridine and acetic anhydride were sequentially added as catalysts to the modified polyamic acid solution, and after being stirred evenly, the mixture was stirred in an oil bath at 75° C. for 10 h. After the reaction was completed, the mixture was cooled to room temperature, and then the reaction solution was discharged into 1 volume of ethanol, and the solid was filtered and collected, and washed three times with distilled water and ethanol in sequence, and vacuum dried to obtain a modified polyimide resin;

[0064] Wherein, the mass ratio of pyridine, acetic anhydride and modified polyamic acid solution is 0.6:1:10.

[0065] The method for preparing the coating material for photosensitive drum transfer comprises the following steps:

[0066] (1) Weighing a polycarbonate resin according to amount and dissolving it in an organic solvent, sequentially adding a modified polyimide resin, an organic charge transport material and an antioxidant, and stirring them thoroughly to form a coating for photosensitive drum transfer;

[0067] (2) The coating material for photosensitive drum transfer is coated on the surface of the photosensitive drum transfer base layer with a coating thickness of 20 μm. After drying, a coating material for photosensitive drum transfer is obtained.

[0068] Example 3

[0069] A coating material for photosensitive drum transfer, calculated by parts by weight, comprising the following components:

[0070] 35 parts of polycarbonate resin, 16 parts of modified polyimide resin, 20 parts of organic charge transport material, 1.5 parts of antioxidant and 100 parts of organic solvent.

[0071] Wherein, the density of the polycarbonate resin is 1.21 g / cm 3 , the melt index is 22.g / 10min (300℃, 2.16kg); the organic charge transport material is 2,2',7,7'-tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9'-spirobifluorene (Spiro-OMeTAD); the antioxidant is antioxidant 405; and the organic solvent is 1,2-dichloroethane.

[0072] Wherein, the preparation method of the modified polyimide resin comprises:

[0073] S1. Preparation of aminated rhenium diselenide:

[0074] ReSe2 powder and anhydrous ethanol were mixed and refluxed for 2 hours, and then the ethanol was removed and dried to obtain M-ReSe2. Then M-ReSe2 and KH-550 were mixed in deionized water, stirred at 60°C for 8 hours, and then the liquid was filtered out, washed three times with water and dried to obtain NH2-ReSe2.

[0075] Among them, the mass ratio of ReSe2 powder and anhydrous ethanol is 1:20; the mass ratio of M-ReSe2, KH-550 and deionized water is 1:0.3:20;

[0076] S2. Preparation of modified polyamic acid:

[0077] Weigh NH2-ReSe2 and 2,5-di(aminomethyl)furan separately and mix them into N-methylpyrrolidone. Stir mechanically at room temperature until they are evenly dispersed. Then gradually add hexafluorodianhydride within 1 hour. After complete addition, continue stirring for 12-24 hours under nitrogen protection. After the reaction is completed, a modified polyamic acid solution is obtained.

[0078] Wherein, the mass ratio of hexafluorodianhydride, NH2-ReSe2, 2,5-di(aminomethyl)furan and N-methylpyrrolidone is 0.88:0.24:0.18:20;

[0079] S3, preparing modified polyimide resin:

[0080] Pyridine and acetic anhydride are sequentially added as catalysts to the modified polyamic acid solution, and after being stirred evenly, the mixture is stirred in an oil bath pot at 75-95° C. for 15 hours. After the reaction is completed, the mixture is cooled to room temperature, and then the reaction solution is discharged into 2 times the volume of ethanol, and the solid is filtered and collected, and washed three times with distilled water and ethanol in sequence, and vacuum dried to obtain a modified polyimide resin;

[0081] The mass ratio of pyridine, acetic anhydride and modified polyamic acid solution is 1.2:2:20; and the ethanol used for discharging is twice the volume of the reaction solution.

[0082] The method for preparing the coating material for photosensitive drum transfer comprises the following steps:

[0083] (1) Weighing a polycarbonate resin according to amount and dissolving it in an organic solvent, sequentially adding a modified polyimide resin, an organic charge transport material and an antioxidant, and stirring them thoroughly to form a coating for photosensitive drum transfer;

[0084] (2) The coating material for photosensitive drum transfer is coated on the surface of the photosensitive drum transfer base layer with a coating thickness of 40 μm. After drying, the coating material for photosensitive drum transfer is obtained.

[0085] Comparative Example 1

[0086] A coating material for photosensitive drum transfer, which differs from Example 1 only in that no modified polyimide resin is added, that is, calculated by weight, includes the following components:

[0087] 25 parts of polycarbonate resin, 15 parts of organic charge transport material, 1 part of antioxidant and 100 parts of organic solvent.

[0088] Comparative Example 2

[0089] A coating material for photosensitive drum transfer, which differs from Example 1 only in that the modified polyimide resin in the composition is replaced by a polyimide resin, that is, calculated by weight, includes the following components:

[0090] 25 parts of polycarbonate resin, 12 parts of polyimide resin, 15 parts of organic charge transport material, 1 part of antioxidant and 100 parts of organic solvent.

[0091] The preparation method of polyimide resin is as follows:

[0092] S1. Preparation of polyamic acid:

[0093] Weigh 2,5-di(aminomethyl)furan separately and mix them into N-methylpyrrolidone. Under room temperature, stir mechanically until they are evenly dispersed. Then gradually add hexafluorodianhydride within 1 hour. After the addition is complete, continue stirring for 18 hours under nitrogen protection. After the reaction is completed, a polyamic acid solution is obtained.

[0094] Wherein, the mass ratio of hexafluorodianhydride, 2,5-bis(aminomethyl)furan and N-methylpyrrolidone is 0.66:0.13:15;

[0095] S2, preparation of polyimide resin:

[0096] Pyridine and acetic anhydride were sequentially added as catalysts to the polyamic acid solution, and after being stirred evenly, the mixture was stirred in an oil bath at 85° C. for 12 h. After the reaction was completed, the mixture was cooled to room temperature, and then the reaction solution was discharged into 1.5 times the volume of ethanol, and the solid was filtered and collected, and washed three times with distilled water and ethanol in sequence, and vacuum dried to obtain a polyimide resin;

[0097] Wherein, the mass ratio of pyridine, acetic anhydride and polyamic acid solution is 0.9:1.5:15.

[0098] Comparative Example 3

[0099] A coating material for photosensitive drum transfer, which is different from Example 1 only in that the preparation process of the modified polyimide resin in the composition is different, and the preparation method of the modified polyimide resin comprises:

[0100] S1. Preparation of modified polyamic acid:

[0101] ReSe2 powder and 2,5-di(aminomethyl)furan were weighed and mixed into N-methylpyrrolidone, and mechanically stirred at room temperature until uniformly dispersed, and then hexafluorodianhydride was gradually added within 1 hour. After complete addition, stirring was continued for 18 hours under nitrogen protection. After the reaction was completed, a modified polyamic acid solution was obtained;

[0102] Among them, the mass ratio of hexafluorodianhydride, ReSe2 powder, 2,5-bis(aminomethyl)furan and N-methylpyrrolidone is 0.66:0.18:0.13:15;

[0103] S2. Preparation of modified polyimide resin:

[0104] Pyridine and acetic anhydride were sequentially added as catalysts to the modified polyamic acid solution, and after being stirred evenly, the mixture was stirred in an oil bath at 85° C. for 12 h. After the reaction was completed, the mixture was cooled to room temperature, and then the reaction solution was discharged into 1.5 times the volume of ethanol, and the solid was filtered and collected. The solid was washed three times with distilled water and ethanol in sequence, and vacuum dried to obtain a modified polyimide resin.

[0105] Wherein, the mass ratio of pyridine, acetic anhydride and modified polyamic acid solution is 0.9:1.5:15.

[0106] Experimental example

[0107] In order to more clearly illustrate the content of the present invention, the performance of the coating materials for photosensitive drum transfer prepared in Example 1 and Comparative Examples 1-3 was tested and compared.

[0108] Four identical aluminum-based photosensitive drums were prepared. A 2 μm thick charge blocking layer UCL (nylon resin and TiO2 mass ratio of 1:2) was first coated on the surface of the aluminum-based photosensitive drum, and then a 0.5 μm thick charge generating layer CGL (phthalocyanine titanium and polyvinyl butyral mass ratio of 1:1) was coated. Then, 30 μm thick coating materials prepared in Example 1 and Comparative Examples 1-3 of the present invention were respectively coated on the surface, and then dried at 120°C for half an hour to obtain four different photosensitive drums.

[0109] (1) The photosensitive sensitivity of four different photosensitive drums was quantitatively measured using the test system of the photoconductive drum tester PDT-2000LTM (25°C, 55 RH%).

[0110] (2) Four different photosensitive drums were installed on an HP LaserJet 2420 printer for normal printing. The applicable standard was ISO / IEC 19752:2017. The ink coverage rate of A4 paper was 5%. After printing 50,000 sheets, the wear resistance was observed. The scratch performance (severity: lighter < medium < darker) and the wear degree (wear thickness) of the outermost coating material of the photosensitive drum were tested.

[0111] The results are shown in Table 1:

[0112] Table 1 Performance of different photosensitive drums

[0113] Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 <![CDATA[Sensitivity E 1 / 2 (μJ / cm 2 )]]> 0.138 0.227 0.209 0.151 Scratches Shallow Darker medium medium Wear loss (μm) 2.1 7.8 5.2 4.3

[0114] It can be seen from Table 1 that after the coating material prepared in Example 1 is applied to the photosensitive drum, not only the photoelectric sensitivity reaches 0.138 μJ / cm 2 , in line with market requirements (0.1<E 1 / 2 <0.15), indicating that its energy conversion efficiency is better than other comparative examples; and after printing 50,000 sheets of A4 paper, the scratches on the coating material are shallow and the wear amount is relatively small, indicating that its wear resistance is relatively good.

[0115] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms should not be understood as necessarily being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0116] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A coating material for photosensitive drum transfer, characterized in that: Calculated by weight, it includes the following ingredients: 15-35 parts of polycarbonate resin, 8-16 parts of modified polyimide resin, 10-20 parts of organic charge transport material, 0.5-1.5 parts of antioxidant and 100 parts of organic solvent; The preparation method of the modified polyimide resin comprises: S1. Preparation of aminated rhenium diselenide: ReSe2 powder and anhydrous ethanol are mixed and refluxed for 1-2 hours, and then the ethanol is removed and dried to obtain M-ReSe2. Then M-ReSe2 and KH-550 are mixed in deionized water, stirred at 50-60°C for 4-8 hours, and then the liquid is filtered out, washed three times with water and dried to obtain NH2-ReSe2. S2. Preparation of modified polyamic acid: Weigh NH2-ReSe2 and 2,5-di(aminomethyl)furan separately and mix them into N-methylpyrrolidone. Stir mechanically at room temperature until they are evenly dispersed. Then gradually add hexafluorodianhydride within 1 hour. After complete addition, continue stirring for 12-24 hours under nitrogen protection. After the reaction is completed, a modified polyamic acid solution is obtained. S3, preparing modified polyimide resin: Pyridine and acetic anhydride are sequentially added as catalysts to the modified polyamic acid solution, and after stirring evenly, the mixture is stirred in an oil bath at 75-95°C for 10-15 hours. After the reaction is completed, the mixture is cooled to room temperature, and then the reaction solution is discharged into ethanol. The solid is filtered and collected, and washed three times with distilled water and ethanol in sequence, and vacuum dried to obtain a modified polyimide resin.

2. The coating material for photosensitive drum transfer according to claim 1, characterized in that: The density of the polycarbonate resin is 1.21 g / cm 3 The melt index is 22.g / 10min at 300°C and 2.16kg.

3. The coating material for photosensitive drum transfer according to claim 1, characterized in that: The organic charge transport material is poly-3,4-ethylenedioxythiophene or 2,2',7,7'-tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9'-spirobifluorene.

4. The coating material for photosensitive drum transfer according to claim 1, characterized in that: The antioxidant is one of antioxidant 4010NA, antioxidant 2246, antioxidant 405, antioxidant 4010, and antioxidant 4020.

5. The coating material for photosensitive drum transfer according to claim 1, characterized in that: The organic solvent is one of dichloromethane, chloroform and 1,2-dichloroethane.

6. The coating material for photosensitive drum transfer according to claim 1, characterized in that: In S1, the mass ratio of ReSe2 powder to anhydrous ethanol is 1:10-20; the mass ratio of M-ReSe2, KH-550 and deionized water is 1:0.2-0.3:10-20.

7. The coating material for photosensitive drum transfer according to claim 1, characterized in that: In the S2, the mass ratio of hexafluorodianhydride, NH2-ReSe2, 2,5-di(aminomethyl)furan and N-methylpyrrolidone is 0.44-0.88:0.12-0.24:0.09-0.18:10-20.

8. The coating material for photosensitive drum transfer according to claim 1, characterized in that: In S3, the mass ratio of pyridine, acetic anhydride and modified polyamic acid solution is 0.6-1.2:1-2:10-20; and the ethanol used for discharging is 1-2 times the volume of the reaction solution.

9. A method for preparing a coating material for photosensitive drum transfer according to claim 1, characterized in that: The following steps are involved: (1) Weighing a certain amount of polycarbonate resin and dissolving it in an organic solvent, adding a modified polyimide resin, an organic charge transport material and an antioxidant in sequence, and stirring them thoroughly to form a coating for photosensitive drum transfer; (2) Coating the coating material for photosensitive drum transfer on the surface of the photosensitive drum transfer base layer with a coating thickness of 20-40 μm. After drying, the coating material for photosensitive drum transfer is obtained.