Processing method of conductive substrate for electrophotographic photoreceptor

Abstract

The invention relates to a processing method of a conductive substrate for an electrophotographic photoreceptor, and belongs to the technical field of electrophotographic imaging elements. According to the method, by controlling the surface glossiness of the conductive substrate to be 193 GU to 325 GU, the number of foreign matters capable of causing black spots of a printed portrait on the surface of the conductive substrate can be reduced, so that reflection of write-in light irradiated to the surface of the conductive substrate is weakened, interference fringes are weakened, and the black spots of the image are reduced; furthermore, by controlling the pH value, the temperature and the cleaning time of the cleaning solution for cleaning the conductive substrate, the chemical reaction degree of the surface of the conductive substrate in the alkaline cleaning solution can be adjusted, and the surface glossiness of the conductive substrate further meets the requirement of the invention; compared with the control of the processing conditions of the conductive substrate and the physical treatment of the surface of the conductive substrate, the production efficiency and the processing cost are higher.

Description

TECHNICAL FIELD

[0001] The present application relates to a processing method of a conductive substrate for electrophotographic photoreceptors, and belongs to the technical field of electrophotographic imaging elements. BACKGROUND

[0002] A common method for making electrophotographic photoreceptors (OPC) is to coat a conductive substrate (drum base) surface that has been specially treated with a bottom coating layer (UCL), a charge generation layer (CGL), a charge transport layer (CTL), and other organic coating layers in sequence. OPC is the most core device in automatic office equipment such as laser printers, laser copiers, and laser multifunction machines, which outputs images through the processes of charging, exposure, development, and transfer.

[0003] The exposure process generally refers to vertically irradiating a writing light (laser) with a wavelength of 780 nm on the surface of the OPC. The bottom coating layer of the electrophotographic photoreceptor is usually transparent or translucent, so when exposed, the writing light will penetrate the bottom coating layer and reflect on the surface of the conductive substrate, and then interfere, resulting in enhanced and weakened areas reflecting to the CGL to generate different amounts of charges, causing differences in the surface potential of the OPC, and ultimately leading to uneven images. In addition, due to the processing and transportation methods of the conductive substrate, the surface of the conductive substrate often has foreign matter that can cause black spots in the printed image.

[0004] In order to solve the interference problem of the electrophotographic photoreceptor, common literature introduces two methods of controlling the processing conditions of the conductive substrate and physically treating the surface of the conductive substrate, such as the organic photoreceptor, image forming method, and image forming device disclosed in Chinese Patent No. CN101807015A, which solves the interference stripe problem of the photoreceptor by controlling the processing conditions of the conductive substrate Rpk, Rvk, and Rk, but this method requires high precision of the turning machine and turning tool for processing the conductive substrate, and is costly. Chinese Patent No. CN101449210A discloses an electrophotographic photoreceptor and a manufacturing method of a conductive substrate, as well as an imaging device and an electrophotographic cartridge, which uses a flexible material that meets special requirements to contact the surface and moves relatively to solve the interference stripe problem of the photoreceptor by physically treating the surface, but this method has relatively low production efficiency.

[0005] Currently, the method for cleaning the conductive substrate in the field is more concerned about the residual foreign matter after cleaning, and there is no related report on solving the interference problem of the electrophotographic photoreceptor or reducing the foreign matter on the surface of the conductive substrate that causes black spots in the printed image. SUMMARY

[0006] In order to overcome the defects of the prior art, the purpose of the present application is to provide a treatment method for the conductive substrate of an electrophotographic photoreceptor, which can well solve the defects of the electrophotographic photoreceptor producing interference stripes, black spots and the like.

[0007] In order to achieve the purpose of the present application, the following technical solutions are provided.

[0008] A treatment method for the conductive substrate of an electrophotographic photoreceptor, the method being to control the surface gloss of the conductive substrate to be 193 GU ~ 325GU.

[0009] Further, the conductive substrate is washed with a cleaning solution, so that the surface gloss of the conductive substrate is 193 GU ~ 325GU.

[0010] Further, the method steps are specifically as follows: Under the conditions that the pH value of the cleaning solution is 13 ~ 16 and the temperature is 40℃ ~ 60℃, the conductive substrate is washed with the cleaning solution, and the washing is performed until the gloss of the conductive substrate measured by a gloss meter is 193 GU ~ 325GU, that is, the treatment is completed.

[0011] The cleaning solution is an alkaline cleaning agent commonly used in the art in the prior art, and the pH value thereof is adjusted by water; preferably, the alkaline cleaning agent is a cleaning agent for cleaning the surface of a metal; more preferably, the alkaline cleaning agent is a cleaning agent for cleaning an aluminum alloy, and the pH value thereof is 17 ~ 30, such as Shenglongjie SLJ-596, Youyang T-26, Kelitai TA-6105, Hanggao AK-1518, Baikeda PA-149, etc.

[0012] Further, the pH value of the cleaning solution is 13 ~ 14.

[0013] Further, the cleaning time is 1 min ~ 2 min, starting from the time when the conductive substrate is completely immersed in the cleaning solution.

[0014] Advantages (1) The present application provides a treatment method for the conductive substrate of an electrophotographic photoreceptor, which can reduce the number of foreign matters on the surface of the conductive substrate that can cause black spots in the printed image, thereby weakening the reflection of the writing light irradiated onto the surface of the conductive substrate, weakening the interference stripes, and reducing the black spots in the image, by controlling the surface gloss of the conductive substrate to be in the range of 193 GU ~ 325GU.

[0015] (2) The present application provides a treatment method for the conductive substrate of an electrophotographic photoreceptor, which can adjust the chemical reaction degree of the surface of the conductive substrate in an alkaline cleaning solution by controlling the pH value, temperature and cleaning time of the cleaning solution for cleaning the conductive substrate, and further make the surface glossiness of the conductive substrate meet the requirements of the present application.

[0016] (3) The present application provides a treatment method for the conductive substrate of an electrophotographic photoreceptor, which can treat the surface of the conductive substrate by a slight chemical reaction method, and has more advantages in production efficiency and processing cost compared with controlling the processing conditions of the conductive substrate and physically treating the surface of the conductive substrate. DETAILED DESCRIPTION

[0017] The present application will be described in detail below with specific examples, but is not limited to the patent of the present application.

[0018] In the following examples and comparative examples: The glossiness instrument is a glossiness instrument meeting the requirements of JJG696-2002; The adopted detergent is Keli TA-6105, which is an alkaline cleaning agent with a pH value of 17-30 for cleaning aluminum alloy.

[0019] Example 1 A treatment method for the conductive substrate of an electrophotographic photoreceptor, the steps of which are as follows: (1) 10 parts by weight of detergent and 100 parts by weight of deionized water are added to a cleaning tank, and after being stirred and mixed uniformly, a cleaning solution with a pH value of 14 is formed, the cleaning tank is provided with an electric heater for adjusting the temperature of the solution, and the temperature of the solution is heated to 60℃; the conductive substrate is placed in the cleaning tank and cleaned for 2 min, and the glossiness of the conductive substrate is measured by a glossiness instrument to be 193GU, and the treatment is completed.

[0020] (2) 120 parts by weight of TiO2, 500 parts by weight of methanol are first added to a sand mill and dispersed for 1 h, then 220 parts by weight of nylon resin and 500 parts by weight of methanol are added and mixed and dispersed in the sand mill to prepare a primer layer dispersion liquid, which is uniformly coated on the surface of the conductive substrate treated in step (1), and after drying in an oven at 90℃ for 30 min, a primer layer with a thickness of 1.0 μm is formed.

[0021] 95 parts by weight of γ-phthalocyanine titanium oxide, 50 parts by weight of polyvinyl butyral, 2900 parts by weight of ethyl acetate, 450 parts by weight of cyclohexanone and 165 parts by weight of methyl ethyl ketone are added to a sand mill and mixed and dispersed to prepare a charge generation layer dispersion liquid, which is coated on the surface of the primer layer, and after drying in an oven at 90℃ for 30 min, a charge generation layer with a thickness of 0.2 μm is formed.

[0022] 2 parts by weight of bis (2, 4-dimethylphenyl) -N, N-diphenylphenyl diamine, 7 parts by weight of N- (2, 4-dimethylphenyl) -2, 4-dimethylaniline, 1 part by weight of triphenylamine, 6 parts by weight of polycarbonate resin and 130 parts by weight of tetrahydrofuran were added into a stirred tank and mixed and dissolved for 21 h to prepare a charge transport layer solution, which was uniformly coated on the surface of the charge generation layer, and after drying in an oven at 100 ℃ for 50 min, a charge transport layer with a thickness of 25 μm was formed to prepare an electrophotographic photoreceptor.

[0023] Example 2 A method for treating an electrically conductive substrate for an electrophotographic photoreceptor, the method comprising the following steps: (1) 7 parts by weight of a detergent and 100 parts by weight of deionized water were added into a cleaning tank, and after being stirred and mixed uniformly, a cleaning solution with a pH value of 13 was formed, the cleaning tank was equipped with an electric heater for adjusting the temperature of the solution, and the temperature of the solution was heated to 60 ℃; the electrically conductive substrate was placed in the cleaning tank and cleaned for 2 min, and the glossiness of the electrically conductive substrate was measured by a glossiness meter to be 226 GU, and the treatment was completed.

[0024] (2) The same as step (2) of Example 1.

[0025] Example 3 A method for treating an electrically conductive substrate for an electrophotographic photoreceptor, the method comprising the following steps: (1) 7 parts by weight of a detergent and 100 parts by weight of deionized water were added into a cleaning tank, and after being stirred and mixed uniformly, a cleaning solution with a pH value of 13 was formed, the cleaning tank was equipped with an electric heater for adjusting the temperature of the solution, and the temperature of the solution was heated to 40 ℃; the electrically conductive substrate was placed in the cleaning tank and cleaned for 2 min, and the glossiness of the electrically conductive substrate was measured by a glossiness meter to be 298 GU, and the treatment was completed.

[0026] (2) The same as step (2) of Example 1.

[0027] Example 4 A method for treating an electrically conductive substrate for an electrophotographic photoreceptor, the method comprising the following steps: (1) 7 parts by weight of a detergent and 100 parts by weight of deionized water were added into a cleaning tank, and after being stirred and mixed uniformly, a cleaning solution with a pH value of 13 was formed, the cleaning tank was equipped with an electric heater for adjusting the temperature of the solution, and the temperature of the solution was heated to 40 ℃; the electrically conductive substrate was placed in the cleaning tank and cleaned for 1 min, and the glossiness of the electrically conductive substrate was measured by a glossiness meter to be 325 GU, and the treatment was completed.

[0028] (2) The same as step (2) of Example 1.

[0029] Comparative Example 1 A treatment method of a conductive substrate for electrophotographic photoreceptors, the method comprising the following steps: (1) 1 part by weight of a detergent and 100 parts by weight of deionized water were added to a cleaning tank, and after stirring and mixing uniformly, a cleaning solution with a pH value of 11 was formed. The cleaning tank was equipped with an electric heater for adjusting the temperature of the solution, and the temperature of the solution was heated to 40°C. The conductive substrate was placed in the cleaning tank and cleaned for 2 min. The glossiness of the conductive substrate was measured by a glossiness meter to be 384 GU, and the treatment was completed.

[0030] (2) The same as step (2) of Example 1.

[0031] Comparative Example 2 A treatment method of a conductive substrate for electrophotographic photoreceptors, the method comprising the following steps: (1) 7 parts by weight of a detergent and 100 parts by weight of deionized water were added to a cleaning tank, and after stirring and mixing uniformly, a cleaning solution with a pH value of 13 was formed. The cleaning tank was equipped with an electric heater for adjusting the temperature of the solution, and the temperature of the solution was heated to 30°C. The conductive substrate was placed in the cleaning tank and cleaned for 1 min. The glossiness of the conductive substrate was measured by a glossiness meter to be 351 GU, and the treatment was completed.

[0032] (2) The same as step (2) of Example 1. Comparative Example 3 A treatment method of a conductive substrate for electrophotographic photoreceptors, the method comprising the following steps: (1) 7 parts by weight of a detergent and 100 parts by weight of deionized water were added to a cleaning tank, and after stirring and mixing uniformly, a cleaning solution with a pH value of 13 was formed. The cleaning tank was equipped with an electric heater for adjusting the temperature of the solution, and the temperature of the solution was heated to 40°C. The conductive substrate was placed in the cleaning tank and cleaned for 0.5 min. The glossiness of the conductive substrate was measured by a glossiness meter to be 336 GU, and the treatment was completed.

[0033] (2) The same as step (2) of Example 1. Comparative Example 4 A treatment method of a conductive substrate for electrophotographic photoreceptors, the method comprising the following steps: (1) 10 parts by weight of a detergent and 100 parts by weight of deionized water were added to a cleaning tank, and after stirring and mixing uniformly, a cleaning solution with a pH value of 14 was formed. The cleaning tank was equipped with an electric heater for adjusting the temperature of the solution, and the temperature of the solution was heated to 60°C. The conductive substrate was placed in the cleaning tank and cleaned for 4 min. The glossiness of the conductive substrate was measured by a glossiness meter to be 336 GU, and the treatment was completed.

[0034] (2) The same as step (2) of Example 1. Detection Test: The electrophotographic photoreceptors prepared in Examples 1 to 4 and Comparative Examples 1 to 4 were subjected to printing test on a Hewlett Packard 117W laser printer.

[0035] The test results are shown in Table 1: Table 1

[0036] In Table 1: x represents interference fringes, Δ represents acceptable interference fringes, o represents no interference fringes, N represents no visually visible black spots, and Y represents more than one visually visible black spot.

[0037] The test results of Table 1 show that, by controlling the pH value and temperature of the conductive base cleaning solution, the surface gloss of the conductive base is in the range of 193 GU to 325 GU, the reflective ability of the conductive base to the writing light can be weakened, and the risk of black spots in the printed image is reduced. The organic photoreceptor prepared using the conductive base is difficult to produce image defects such as interference fringes and black spots.

Claims

1. A method for processing a conductive substrate for an electrophotographic photoreceptor, characterized in that: The method involves controlling the surface gloss of the conductive substrate to be 193 GU ~ 325 GU.

2. The method for processing a conductive substrate for an electrophotographic photoreceptor according to claim 1, characterized in that: A conductive substrate is used with a cleaning solution to achieve a surface gloss of 193 GU ~ 325 GU.

3. A method for processing a conductive substrate for an electrophotographic photoreceptor according to claim 2, characterized in that: The conductive substrate is cleaned with the cleaning solution at a pH of 13-16 and a temperature of 40-60°C until the gloss of the conductive substrate, measured by a gloss meter, is 193 GU-325 GU. The treatment is then complete.

4. A method for processing a conductive substrate for an electrophotographic photoreceptor according to claim 2 or 3, characterized in that: The cleaning solution is an alkaline cleaning agent used to clean metal surfaces.

5. A method for processing a conductive substrate for an electrophotographic photoreceptor according to claim 4, characterized in that: Alkaline cleaning agents are cleaning agents with a pH value of 17 to 30 used for cleaning aluminum alloys.

6. A method for processing a conductive substrate for an electrophotographic photoreceptor according to claim 3, characterized in that: The pH value of the cleaning solution is 13 to 14; the cleaning time is 1 to 2 minutes, starting from when the conductive substrate is completely submerged in the cleaning solution.

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