Charge transfer wear-resistant coating for photosensitive drum and preparation method thereof

Abstract

The present invention relates to the technical field of coatings, and discloses a charge transfer wear-resistant coating for photosensitive drums and a preparation method thereof. The charge transfer layer wear-resistant coating for photosensitive drums comprises: a solvent, a resin, a charge transfer material, and a carbon nanotube-modified silicone oil. The above components are mixed to prepare a charge transfer wear-resistant coating for photosensitive drums. The carbon nanotubes and quaternary ammonium salt structures contained therein are used to improve the electrical properties and wear resistance of the coating. The disiloxane structure contained in the intermediate 3 is hydrolyzed and condensed with octamethylcyclotetrasiloxane to form a huge cross-linked network structure, which further improves the wear resistance of the coating. The coating is then applied to the surface of the photosensitive drum, and the wear resistance can be improved by the coating, which solves the problem that the existing charge transfer coating has poor wear resistance and is difficult to meet the high wear resistance requirements of the photosensitive drum, and can meet the high wear resistance requirements of the charge transfer coating and extend the service life of the photosensitive drum.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, in particular to a charge transmission wear-resistant coating for a photosensitive drum and a preparation method thereof. Background Art

[0002] The photosensitive drum is the toner in the printing device. It is generally made of a substrate body made of aluminum or plastic. Photosensitive materials are coated on the substrate. Printing can be performed on paper through photosensitive materials and toner. The toner in the toner is a fine resin particle with an electric charge. During the printing process, the toner charge is opposite to the charge on the surface of the toner. When the charged toner surface passes through the ink roller, the charged area can absorb the toner particles and turn the latent image into a real image. While the toner is rotating, the printing device conveys the paper. The paper tape has the same polarity as the toner surface, but a much stronger charge. When the paper passes through the toner with toner, the toner on the surface of the toner is attracted to the paper, forming a printed pattern on the surface of the paper.

[0003] In laser printing equipment, the photosensitive drum is an important structural component. As printing progresses, the photosensitive drum needs to be replaced and will be worn. With the development of office automation, office equipment is becoming faster and more colorful. People also have higher requirements for the wear resistance of photosensitive drums, hoping to produce more long-life photosensitive drums. However, the existing charge transfer coating has poor wear resistance and is difficult to meet the high wear resistance requirements of photosensitive drums, which affects the service life. Summary of the invention

[0004] The purpose of the present invention is to provide a charge transfer wear-resistant coating for a photosensitive drum and a preparation method thereof, which solves the problem that the existing charge transfer coating has poor wear resistance and is difficult to meet the high wear resistance requirements of the photosensitive drum. The prepared coating has good wear resistance and electrical properties.

[0005] The embodiment of the present invention provides a charge transport wear-resistant coating for a photosensitive drum, wherein the charge transport wear-resistant coating for a photosensitive drum comprises the following raw materials by weight: 70-84 parts by weight of a solvent, 10-15 parts by weight of a resin, 5-10 parts by weight of a charge transport material, and 1-5 parts by weight of a carbon nanotube-modified silicone oil;

[0006] Furthermore, the preparation method of the charge transport wear-resistant coating for the photosensitive drum is:

[0007] The resin is added into the solvent, stirred and dispersed, and then the charge transport material and carbon nanotube modified silicone oil are added thereto, stirred and mixed evenly to obtain the charge transport layer wear-resistant coating for the photosensitive drum.

[0008] Furthermore, the solvent is tetrahydrofuran solvent; and the charge transport material is N,N'-diphenyl-N,N'-bis(4-methylphenyl)-4,4'-biphenylenediamine.

[0009] Furthermore, the resin is at least one of polycarbonate resin and polyurethane resin.

[0010] Furthermore, the preparation method of the carbon nanotube-modified silicone oil is:

[0011] (1) Add mercaptopropyltrimethoxysilane and [(oxirane-2-yl)methyl]bis(propylene-2-en-1-yl)amine to an acetone solvent, stir and mix evenly, then add 2,2-dimethoxy-2-phenylacetophenone (DMPA) thereto, stir and disperse at room temperature, irradiate with ultraviolet light at 365 nm for 20-40 min, and after the reaction is completed, distill under reduced pressure and dry in vacuum to obtain intermediate 1;

[0012] (2) Add intermediate 1 and epichlorohydrin to acetone solvent, stir and disperse, react at 20-35°C for 3-6 hours, and after the reaction is completed, evaporate under reduced pressure, cool, filter, and vacuum dry to obtain intermediate 2;

[0013] (3) Under a nitrogen atmosphere, the oxidized carbon nanotubes were added to deionized water, and ultrasonically dispersed. Then, the intermediate 2 and a 25% by mass aqueous solution of triethylamine were added thereto, and the reaction was stirred at 60-80° C. for 20-36 h. After the reaction was completed, the intermediate 3 was washed with acetone and dried to obtain the intermediate 3.

[0014] (4) Under a nitrogen atmosphere, octamethylcyclotetrasiloxane, intermediate 3, and an emulsifier are added to deionized water, and the mixture is stirred and dispersed. Potassium hydroxide is added thereto at 80-90° C., and the mixture is stirred and reacted for 3-6 hours. After the reaction is completed, the mixture is washed with deionized water and dried to obtain carbon nanotube-modified silicone oil.

[0015] Furthermore, in (1), the mass ratio of mercaptopropyltrimethoxysilane, [(oxirane-2-yl)methyl]bis(propylene-2-en-1-yl)amine, and DMPA is 2.5-3:1:0.02-0.05.

[0016] Furthermore, in (2), the mass ratio of the intermediate 1 to epichlorohydrin is 1:0.15-0.3.

[0017] Furthermore, in (3), the mass ratio of the oxidized carbon nanotubes to the intermediate 2 is 1:0.5-1.

[0018] Furthermore, in (4), the mass ratio of octamethylcyclotetrasiloxane to intermediate 3 is 1:0.5-1.

[0019] Furthermore, in (4), the amount of potassium hydroxide used is 0.1-0.3% of the total mass of octamethylcyclotetrasiloxane and intermediate 3.

[0020] Furthermore, in (4), the emulsifier is at least one of emulsifier AEO-3 and emulsifier AEO-9, and the amount of the emulsifier is 10-30% of the total mass of octamethylcyclotetrasiloxane and intermediate 3.

[0021] The charge transport layer wear-resistant coating for photosensitive drum of the embodiment of the present invention comprises: solvent, resin, charge transport material and carbon nanotube modified silicone oil, and the above components are mixed to obtain the charge transport layer wear-resistant coating for photosensitive drum. The oxidized carbon nanotubes used in the present invention are easy to agglomerate themselves, and the present invention makes them organic, increases their compatibility with organic substances, improves the dispersion effect of carbon nanotubes in organic substances, and evenly disperses them in the coating. Carbon nanotubes have higher strength, and when subjected to friction, they can absorb more friction as stress concentration points, thereby improving the wear resistance of the coating. In addition, the intermediate 3 prepared by the present invention contains more siloxane structures, and when it is hydrolyzed and condensed with octamethylcyclotetrasiloxane, more cross-linking sites can be produced, forming a larger cross-linked network structure, further improving the wear resistance of the coating. Since carbon nanotubes and quaternary ammonium salt structures have good electrical conductivity, they form a conductive network chain with charge transport materials, which assists in improving the charge transport efficiency of the coating, thereby improving the electrical properties of the coating. The coating is applied to the surface of the photosensitive drum, which can improve the wear resistance and solve the problem that the existing charge transfer coating has poor wear resistance and is difficult to meet the high wear resistance requirements of the photosensitive drum. It can meet the high wear resistance requirements of the charge transfer coating and extend the service life of the photosensitive drum. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is the preparation route of intermediate 3. DETAILED DESCRIPTION

[0023] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] 1 g of multi-arm carbon nanotubes was added to 200 mL of mixed acid (sulfuric acid and nitric acid in a volume ratio of 3:1), ultrasonically dispersed for 30 min, refluxed and stirred at 80°C for 30 min. After the reaction was completed, it was cooled to room temperature, deionized water was added, centrifuged, filtered, and dried to obtain oxidized multi-arm carbon nanotubes.

[0025] The charge transport material P-TPD represents N,N'-diphenyl-N,N'-bis(4-methylphenyl)-4,4'-biphenylenediamine.

[0026] Example 1

[0027] (1) Add 30 g of mercaptopropyltrimethoxysilane and 10 g of [(oxirane-2-yl)methyl]bis(propylene-2-en-1-yl)amine to acetone solvent and stir to mix evenly. Then add 0.4 g of DMPA and stir to disperse at room temperature. Irradiate with ultraviolet light at 365 nm for 30 min. After the reaction is completed, evaporate under reduced pressure and dry in vacuum to obtain intermediate 1.

[0028] (2) Add 20 g of intermediate 1 and 5 g of epichlorohydrin into acetone solvent, stir and disperse, and react at 25° C. for 4 h. After the reaction is completed, evaporate under reduced pressure, cool, filter, and dry in vacuum to obtain intermediate 2.

[0029] (3) Under a nitrogen atmosphere, 10 g of oxidized carbon nanotubes were added to deionized water and ultrasonically dispersed. Then, 5 g of intermediate 2 and a 25% by mass aqueous solution of triethylamine were added thereto. The mixture was stirred at 70 °C for 24 h. After the reaction, the mixture was washed with acetone and dried to obtain intermediate 3.

[0030] (4) Under a nitrogen atmosphere, 20 g of octamethylcyclotetrasiloxane, 10 g of intermediate 3, and 10 g of emulsifier AEO-3 were added to deionized water and dispersed with stirring. 0.003 g of potassium hydroxide was added thereto at 90° C. and stirred for reaction for 6 h. After the reaction was completed, the mixture was washed with deionized water and dried to obtain carbon nanotube-modified silicone oil.

[0031] (5) Add 8 g of polycarbonate resin and 2 g of polyurethane resin to 84 g of tetrahydrofuran solvent, stir and disperse, then add 5 g of P-TPD and 1 g of carbon nanotube-modified silicone oil, stir and mix evenly to obtain a charge transport layer wear-resistant coating for a photosensitive drum.

[0032] Example 2

[0033] (1) Add 25 g of mercaptopropyltrimethoxysilane and 10 g of [(oxirane-2-yl)methyl]bis(propylene-2-en-1-yl)amine to an acetone solvent and stir to mix evenly. Then add 0.2 g of DMPA and stir to disperse at room temperature. Irradiate with ultraviolet light at 365 nm for 40 min. After the reaction is completed, evaporate under reduced pressure and dry in vacuum to obtain intermediate 1.

[0034] (2) Add 20 g of intermediate 1 and 6 g of epichlorohydrin into acetone solvent, stir and disperse, and react at 25° C. for 3 h. After the reaction is completed, evaporate under reduced pressure, cool, filter, and dry in vacuum to obtain intermediate 2.

[0035] (3) Under a nitrogen atmosphere, 10 g of oxidized carbon nanotubes were added to deionized water and ultrasonically dispersed. Then, 8 g of intermediate 2 and a 25% by mass aqueous solution of triethylamine were added thereto. The mixture was stirred at 80 °C for 20 h. After the reaction, the mixture was washed with acetone and dried to obtain intermediate 3.

[0036] (4) Under a nitrogen atmosphere, 20 g of octamethylcyclotetrasiloxane, 14 g of intermediate 3, and 3 g of emulsifier AEO-9 were added to deionized water and dispersed with stirring. 0.1 g of potassium hydroxide was added thereto at 90° C. and stirred for reaction for 5 h. After the reaction was completed, the mixture was washed with deionized water and dried to obtain carbon nanotube-modified silicone oil.

[0037] (5) Add 12 g of polycarbonate resin to 79 g of tetrahydrofuran solvent, stir and disperse, then add 6 g of P-TPD and 3 g of carbon nanotube-modified silicone oil, stir and mix evenly to obtain a charge transport layer wear-resistant coating for a photosensitive drum.

[0038] Example 3

[0039] (1) Add 28 g of mercaptopropyltrimethoxysilane and 10 g of [(oxirane-2-yl)methyl]bis(propylene-2-en-1-yl)amine to an acetone solvent and stir to mix evenly. Then add 0.5 g of DMPA and stir to disperse at room temperature. Irradiate with ultraviolet light at 365 nm for 20 min. After the reaction is completed, evaporate under reduced pressure and dry in vacuum to obtain intermediate 1.

[0040] (2) Add 20 g of intermediate 1 and 3 g of epichlorohydrin into acetone solvent, stir and disperse, and react at 20° C. for 6 h. After the reaction is completed, evaporate under reduced pressure, cool, filter, and dry in vacuum to obtain intermediate 2.

[0041] (3) Under a nitrogen atmosphere, 10 g of oxidized carbon nanotubes were added to deionized water and ultrasonically dispersed. Then, 10 g of intermediate 2 and a 25% by mass aqueous solution of triethylamine were added thereto. The mixture was stirred at 60 °C for 36 h. After the reaction, the mixture was washed with acetone and dried to obtain intermediate 3.

[0042] (4) Under a nitrogen atmosphere, 20 g of octamethylcyclotetrasiloxane, 18 g of intermediate 3, 6 g of emulsifier AEO-3, and 4 g of emulsifier AEO-9 were added to deionized water and dispersed with stirring. 0.08 g of potassium hydroxide was added thereto at 80° C. and stirred for reaction for 3 h. After the reaction was completed, the mixture was washed with deionized water and dried to obtain carbon nanotube-modified silicone oil.

[0043] (5) Add 14 g of polyurethane resin to 74 g of tetrahydrofuran solvent, stir and disperse, then add 8 g of P-TPD and 4 g of carbon nanotube-modified silicone oil, stir and mix evenly to obtain a charge transport layer wear-resistant coating for a photosensitive drum.

[0044] Example 4

[0045] (1) Add 30 g of mercaptopropyltrimethoxysilane and 10 g of [(oxirane-2-yl)methyl]bis(propylene-2-en-1-yl)amine to an acetone solvent and stir to mix evenly. Then add 0.4 g of DMPA and stir to disperse at room temperature. Irradiate with ultraviolet light at 365 nm for 40 min. After the reaction is completed, evaporate under reduced pressure and dry in vacuum to obtain intermediate 1.

[0046] (2) Add 20 g of intermediate 1 and 4 g of epichlorohydrin into acetone solvent, stir and disperse, and react at 35° C. for 4 h. After the reaction is completed, evaporate under reduced pressure, cool, filter, and dry in vacuum to obtain intermediate 2.

[0047] (3) Under a nitrogen atmosphere, 10 g of oxidized carbon nanotubes were added to deionized water and ultrasonically dispersed. Then, 8 g of intermediate 2 and a 25% by mass aqueous solution of triethylamine were added thereto. The mixture was stirred at 70 °C for 28 h. After the reaction, the mixture was washed with acetone and dried to obtain intermediate 3.

[0048] (4) Under a nitrogen atmosphere, 20 g of octamethylcyclotetrasiloxane, 20 g of intermediate 3, 9 g of emulsifier AEO-3, and 3 g of emulsifier AEO-9 were added to deionized water and dispersed with stirring. 0.12 g of potassium hydroxide was added thereto at 85° C. and stirred for reaction for 5 h. After the reaction was completed, the mixture was washed with deionized water and dried to obtain carbon nanotube-modified silicone oil.

[0049] (5) Add 7 g of polycarbonate resin and 8 g of polyurethane resin to 70 g of tetrahydrofuran solvent, stir and disperse, then add 10 g of P-TPD and 5 g of carbon nanotube-modified silicone oil, stir and mix evenly to obtain a charge transport layer wear-resistant coating for a photosensitive drum.

[0050] The coating was applied on a 30*357cm long aluminum tube, and the obtained photosensitive drum was cured at 110°C for 2h, and then placed in a room with a temperature of 20±2°C and a humidity of 50±10% and kept away from light for 24 hours. A PDT-2000 electrical performance tester was used, and the pressure was increased to 800±10V, and the setting values ​​were 0.12uj / cm 2 , 0.3uj / cm 2 、0.6uj / cm 2 Three exposure energies, measuring the residual potential VL value of the photosensitive drum (OPC). The exposure energy is 0.12uj / cm 2 The sensitivity BA (v) at this time is obtained by V0-VL.

[0051] Table 1: Electrical performance test results

[0052]

[0053] The photosensitive drum obtained by the above coating and curing is measured for thickness using a FISHER ISPSCOPE thickness gauge. During the measurement, 4 circumferential points are marked first, and 50 points are measured horizontally at each circumferential point. The average value is calculated to obtain the original thickness SD1. Then, it is printed with a Canon IR4525 printer, and after 10,000 pages of the "ISO / IEC 19752" test draft, the thickness is measured using a thickness gauge according to the above method to obtain the thickness SD2 after 10,000 pages. SD1-SD2 is the average wear of 10,000 pages.

[0054] Table 2: Life test results

[0055] Printer / Model Drum stand / model Powder box / model Average wear per 10,000 pages Example 1 Canon ir4525 OEM OEM 0.72um Example 2 Canon ir4525 OEM OEM 0.82um Example 3 Canon ir4525 OEM OEM 1.20um Example 4 Canon ir4525 OEM OEM 0.63um

[0056] It can be seen from Table 1 and Table 2 that the coating in the embodiment not only has low wear and tear and a long service life, but also has a relatively low residual potential VL value, good wear resistance, can meet the wear resistance requirements, and has a long service life.

[0057] The embodiments of the present invention are described above, but the present invention is not limited to the above-mentioned specific implementation modes. The above-mentioned specific implementation modes are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, all of which are protected by the present invention.

Claims

1. A charge transfer wear-resistant coating for a photosensitive drum, characterized in that: The charge transport wear-resistant coating for the photosensitive drum comprises the following raw materials in parts by weight: 70-84 parts by weight of a solvent, 10-15 parts by weight of a resin, 5-10 parts by weight of a charge transport material, and 1-5 parts by weight of a carbon nanotube-modified silicone oil; The preparation method of the charge transfer wear-resistant coating for the photosensitive drum is: The resin is added to the solvent, stirred and dispersed, and then the charge transport material and carbon nanotube modified silicone oil are added thereto, stirred and mixed evenly to obtain the charge transport layer wear-resistant coating for the photosensitive drum; the preparation method of the carbon nanotube modified silicone oil is: (1) Add mercaptopropyl trimethoxysilane and [(oxirane-2-yl)methyl]bis(prop-2-en-1-yl)amine to an acetone solvent, stir and mix evenly, then add 2,2-dimethoxy-2-phenylacetophenone thereto, wherein the mass ratio of mercaptopropyl trimethoxysilane, [(oxirane-2-yl)methyl]bis(prop-2-en-1-yl)amine and 2,2-dimethoxy-2-phenylacetophenone is 2.5-3:1:0.02-0.05, stir and disperse at room temperature, irradiate with ultraviolet light at 365 nm for 20-40 min, and after the reaction is completed, distill under reduced pressure and dry in vacuum to obtain intermediate 1; (2) adding intermediate 1 and epichlorohydrin to acetone solvent, stirring and dispersing, wherein the mass ratio of intermediate 1 to epichlorohydrin is 1:0.15-0.3, reacting at 20-35°C for 3-6 hours, and after the reaction is completed, performing vacuum rotary evaporation, cooling, suction filtration, and vacuum drying to obtain intermediate 2; (3) Under a nitrogen atmosphere, adding oxidized carbon nanotubes to deionized water, ultrasonically dispersing, and then adding intermediate 2 and a 25% by mass aqueous solution of triethylamine, wherein the mass ratio of oxidized carbon nanotubes to intermediate 2 is 1:0.5-1, stirring and reacting at 60-80° C. for 20-36 h. After the reaction is completed, washing with acetone and drying to obtain intermediate 3; (4) Under a nitrogen atmosphere, octamethylcyclotetrasiloxane, intermediate 3 and an emulsifier are added to deionized water, wherein the mass ratio of octamethylcyclotetrasiloxane to intermediate 3 is 1:0.5-1, and the mixture is dispersed by stirring. Potassium hydroxide is added thereto at 80-90° C. and the mixture is stirred for reaction for 3-6 hours. After the reaction is completed, the mixture is washed with deionized water and dried to obtain carbon nanotube-modified silicone oil.

2. The charge transport wear-resistant coating for a photosensitive drum according to claim 1, characterized in that: The solvent is tetrahydrofuran solvent; the charge transport material is N,N'-diphenyl-N,N'-bis(4-methylphenyl)-4,4'-biphenylenediamine.

3. The charge transport wear-resistant coating for a photosensitive drum according to claim 1, characterized in that: The resin is at least one of polycarbonate resin and polyurethane resin.

4. The charge transport wear-resistant coating for a photosensitive drum according to claim 1, characterized in that: In the above (4), the amount of potassium hydroxide used is 0.1-0.3% of the total mass of octamethylcyclotetrasiloxane and intermediate 3.

5. The charge transport wear-resistant coating for a photosensitive drum according to claim 1, characterized in that: In the above (4), the emulsifier is at least one of emulsifier AEO-3 and emulsifier AEO-9, and the amount of the emulsifier is 10-30% of the total mass of octamethylcyclotetrasiloxane and intermediate 3.

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