KR101931308B1 - Method for manufacturing photo conductor aluminum drum - Google Patents

Abstract

A manufacturing method of an aluminum drum for electrophotographic photosensitive drum, which is disclosed, comprises: a degreasing step of degreasing a cylindrical aluminum substrate; An etching step of immersing the cylindrical aluminum substrate degreased by the degreasing process in an etching solution containing sulfuric acid at a temperature of 0 캜 to 15 캜 to uniformly treat the surface of the cylindrical aluminum substrate; A washing step of washing the cylindrical aluminum substrate subjected to the etching treatment by the etching step with water; And a photoreceptor forming step of applying a photosensitive coating material to the outer surface of the cylindrical aluminum substrate washed by the water washing step and thermally curing the photosensitive coating material.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of manufacturing an aluminum drum for electrophotographic photosensitive drum,

The present invention (Disclosure) relates to a manufacturing method of an aluminum drum for electrophotographic photosensitive drum constituting a cartridge which is a main component of a copying machine and a laser printer. More particularly, the present invention relates to a method of manufacturing an aluminum drum for electrophotographic photosensitive drum, which can reduce an anodizing process for surface treatment of an aluminum drum to reduce a processing time and a process cost.

Herein, the background art relating to the present invention is provided, and they are not necessarily referred to as known arts.

The field of electrophotography has begun to be applied to copying machines and has spread rapidly in the field of printers due to its high quality and high image quality.

They form a latent image by irradiating light onto a photoreceptor subjected to de-electrification (grounding static electricity), obtain visualization and image by developing the toner, and have a very fast copying or printing speed.

The properties required for such a photoconductor to be used in the electrophotographic method are required to be antistatic, charge retentivity, light responsiveness, charge transportability, repetitive stability, environmental resistance, refractory fracture characteristics, abrasion resistance, image sharpness and the like.

The photosensitive material forming the photosensitive layer of the photoreceptor uses an organic photoconductive material (OPC, Organic Photo Conductor) from the viewpoints of light weight, cost, and stability. The photoreceptor base material is lightweight, corrosion resistant, Due to its advantages, 'tubular aluminum base material' and 'aluminum base material' have been used.

On the other hand, in order to improve the adhesion between the photoreceptor base material and the photosensitive layer, a process of forming a film (anodizing) on the surface of the aluminum base material by anodic oxidation is used.

In the step of forming the film by anodic oxidation of the aluminum substrate, the aluminum surface is oxidized by the oxygen generated on the anode when the aluminum substrate is used as the anode in the electrolytic solution and electricity is generated to form an aluminum oxide film, Followed by washing with water.

However, cracking of the oxide film often occurs during the process of applying a photosensitive paint to an anodized aluminum film and thermally curing the film. Such a cracked film causes a decline in the resolution of the image. Such cracking of the film causes the concentration of the electrolyte In the case of anodic oxidation, the type, concentration, voltage, current property, current density, temperature, electrolytic time, aluminum material, and processing state of the electrolyte during the anodic oxidation It is required to select suitable conditions for

On the other hand, the aluminum film formed by the anodic oxidation is porous and adsorbable, so that the film tends to be contaminated, and residual substances such as sulfuric acid are left in the holes, Of pure water, a high-temperature solution of a chemical, and the like.

On the other hand, the characteristics of the aluminum film by the anodic oxidation are greatly influenced by the pretreatment process before forming the aluminum oxide film. In general, a cylindrical aluminum base material used for an electrophotographic photosensitive aluminum drum is cut to a suitable size by a cutting process. When a cutting oil component used in the aluminum base material remains on the aluminum base material, an aluminum oxide film formed by anodic oxidation A failure occurs.

Further, when the roughness of the surface of the aluminum base material is severe, a uniform aluminum oxide film can not be formed, thereby causing defects such as cracks and pitting.

This deficiency of the aluminum oxide coating film causes defective or shortened life span of the aluminum drum for electrophotographic photosensitive drum.

For example, Korean Patent Laid-open Publication No. 10-2001-0039922 and Korean Patent Publication No. 10-0525686 can be cited as prior arts for the surface treatment of aluminum substrates.

However, these prior arts have been introduced in the pre-processing step of the anodic oxidation process, and an anodization process is necessarily required to improve the adhesion between the photosensitive substrate and the photosensitive layer.

1. Korean Patent Publication No. 10-2001-0039922 2. Korean Patent Registration No. 10-0525686

Disclosure of the Invention Disclosure of the present invention is to reduce the process time and process cost required for the surface treatment of an aluminum pipe in order to realize an appropriate adhesion of a photosensitive paint to the surface of an aluminum pipe by removing the anodizing process And an object of the present invention is to provide a method of manufacturing an aluminum drum for electrophotographic photosensitive drum.

The present invention is not intended to be exhaustive or to limit the scope of the present invention to the full scope of the present invention. of its features).

In order to solve the above problems, a method of manufacturing an aluminum drum for electrophotographic photosensitive drum according to an aspect of the present invention includes: a degreasing step of degreasing a cylindrical aluminum substrate; An etching step of immersing the cylindrical aluminum substrate degreased by the degreasing process in an etching solution containing sulfuric acid at a temperature of 0 캜 to 15 캜 to uniformly treat the surface of the cylindrical aluminum substrate; A washing step of washing the cylindrical aluminum substrate subjected to the etching treatment by the etching step with water; And a photoreceptor forming step of applying a photosensitive coating material to the outer surface of the cylindrical aluminum substrate washed by the water washing step and thermally curing the photosensitive coating material.

In the method of manufacturing an aluminum drum for electrophotographic photosensitive drum according to an aspect of the present invention, in the etching step, the etchant is preferably prepared at a temperature of 2 ° C to 12 ° C.

In the method of manufacturing an aluminum drum for electrophotographic photosensitive drum according to an aspect of the present invention, it is preferable that in the etching step, the etching solution is prepared by diluting sulfuric acid to a concentration of 10 to 20%.

In the method of manufacturing an aluminum drum for electrophotographic photosensitive drum according to an aspect of the present invention, it is preferable that the etching process is performed within a time range of 15 minutes to 20 minutes without application of an electric current.

In the method of manufacturing an aluminum drum for electrophotographic photosensitive drum according to an aspect of the present invention, it is preferable that ultrasonic waves are applied to the degreasing step.

In the method of manufacturing an aluminum drum for electrophotographic photosensitive drum according to an aspect of the present invention, the etching solution is selected from the group consisting of phosphoric acid, ethanolamine, diethanolamine, triethanolamine, 2-amino- Amino-1-propanol, 2-amino-1-propanol, 1-amino-2-propanol and 1-amino-pentanol are preferably added.

According to the present invention, since proper adhesion between the photosensitive material substrate and the photosensitive layer is realized only by the etching process of the aluminum substrate without proceeding with the anodizing process (anodizing process), the process time and the process cost can be greatly reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view for explaining a method of manufacturing an aluminum drum for electrophotographic photosensitive drum according to an embodiment of the present invention; FIG.
Fig. 2 is a SEM photograph of the surface of the aluminum substrate after the degreasing step in Fig. 1; Fig.
Fig. 3 is a photograph of the surface SEM of the aluminum substrate after the etching process in Fig. 1; Fig.
4 is a photograph of a surface SEM of an aluminum substrate subjected to a conventional anodizing process after the degreasing process of FIG. 1;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a method of manufacturing an aluminum drum for electrophotographic photosensitive drum according to the present invention will be described in detail with reference to the drawings.

It is to be understood, however, that the scope of the present invention is not limited to the embodiments described below, and those skilled in the art of the present invention, other than the scope of the present invention, It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention.

In addition, the terms used below are selected for convenience of explanation. Therefore, the technical meaning of the present invention should not be limited to the prior meaning, but should be properly interpreted in accordance with the technical idea of the present invention.

1 is a view for explaining a method of manufacturing an aluminum drum for electrophotographic photosensitive drum according to an embodiment of the present invention.

Referring to Fig. 1, the method for manufacturing an aluminum drum for electrophotographic photosensitive drum according to the present embodiment includes a degreasing step (S10), an etching step (S20), a washing step (S30) and a photoreceptor forming step (S40).

Prior to describing each process in detail, the most important feature of the present invention is that an anodizing process, that is, an anodizing process, which is a process that is essentially applied in a conventional method for manufacturing an electrophotographic photosensitive drum, This is because the oxide film itself created by intentionally oxidizing and corroding has a role of protecting the product from external influences and a surface treatment method which enables coloring on the porous surface.

Therefore, not only the process time and process cost required for the anodic oxidation process can be reduced, but also the pin-hole generated on the surface of the aluminum substrate by the anodic oxidation process, which is necessarily required after the anodization process, A process for filling the gap is not necessary.

As a result, the present invention is characterized by adopting a new process condition in the etching step (S20), so that there is no need to undergo the conventional anodic oxidation process and the sealing process.

Here, the new process conditions are limited to the kind of the solution to be subjected to the etching step (S20) and the temperature thereof. Specifically, in the conventional etching process, the etching process (S20) in the present invention is characterized by a relatively low temperature with a sulfuric acid solution of 0 ° C to 15 ° C, while the etching process is performed at a room temperature to 60 ° C.

Each step of the method for manufacturing an aluminum drum for electrophotographic photosensitive drum according to the present embodiment will be described below.

The degreasing step (S10) uses a weakly alkaline or slightly acidic solution for removing foreign matter such as cutting oil remaining on the surface of the cylindrical aluminum base material.

In the degreasing step (S10), impurities can be more effectively removed by using ultrasonic waves in combination.

The water used for the water washing process may be water which is heated to 50 to 70 DEG C so as to effectively remove the water from the degreasing solution while using a small amount of water. So that it is preferable.

When the temperature of water used for washing with water is lower than 50 캜, the washing effect is insignificant and when the temperature is higher than 70 캜, the operation cost is increased.

The etching step S20 is a step of immersing the degreased cylindrical aluminum substrate in a degreasing step S10 in an etching solution containing sulfuric acid at a temperature of 0 캜 to 15 캜 to uniformly treat the surface of the cylindrical aluminum substrate.

The etching step S20 is a step for removing impurities such as organic residue remaining after the degreasing step S10 and for making the surface of the aluminum substrate more uniform.

The etching step S20 is carried out using an etching solution containing sulfuric acid. It is preferable that the etching solution is diluted to a concentration of 10 to 20%.

And more preferably a sulfuric acid solution having a concentration of 18% or less.

On the other hand, the etching solution is preferably a solution of at least one selected from the group consisting of phosphoric acid, ethanolamine, diethanolamine, triethanolamine, 2-amino-2-methyl-2-propanol, -Propanol and 1-amino-pentanol are preferably added and prepared.

Here, the etching process (S20) is most importantly performed using an etchant in a low temperature state, and it is more preferable that the etchant is prepared at a temperature of 2 占 폚 to 12 占 폚.

The etching step (S20) is preferably carried out within a time range of 15 minutes to 20 minutes. Unlike the anodic oxidation process, it is characterized in that it proceeds without current application.

When the time is shorter than 15 minutes, the etching effect is insignificant, and when the time is longer than 20 minutes, there is a problem that the aluminum substrate is backed or pinholes are formed on the surface.

The water washing step (S30) is a step of washing the cylindrical aluminum substrate subjected to the etching treatment by the etching step (S20) with water.

In the water washing step (S30), purified water or deionized water heated to 50 to 70 DEG C is preferably used as in the water washing step after the degreasing step. As a result, it is possible to prevent foreign matter from being adsorbed on the surface of the aluminum base material and to prevent occurrence of black spots in the image.

After the water washing step (S30), it is preferable to maintain the water at 100 to 150 DEG C in the dryer to completely remove water.

Next, the photoreceptor forming step (S40) is a step of applying a photosensitive paint to the outer surface of the cylindrical aluminum substrate washed by the water washing step and thermally curing to form a photoreceptor layer.

As the photosensitive layer, a charge generation layer and a charge transfer layer are successively coated and laminated. In the charge generation layer, metal phthalocyanine is dispersed in a vinyl chloride vinyl acetate copolymer in a ratio of 1: 1, The charge transport layer can be formed by mixing polycarbonate and a hydrazone-based material and coating them.

[Example]

The cut cylindrical aluminum substrate was treated with a degreasing agent (manufacturer: DIPSOL product name: AL-47, 30 g / l) for 4 minutes at 40 캜 in combination with ultrasonic waves.

After the degreasing process, the aluminum substrate was washed with purified water at 60 캜, and then a sulfuric acid solution having a concentration of 18% and a temperature of 7 캜 was prepared as an etchant by using purified water and then etched for 16 minutes.

After the etching treatment, the aluminum substrate was cleaned using purified water at 60 占 폚.

Washing treatment was performed by ultrasonic washing twice with deionized water at 60 ° C, followed by drying at 120 ° C for 12 minutes in a dryer to remove moisture.

Next, the photoconductor layer is formed by applying and dispersing the metal phthalocyanine to the vinyl chloride vinyl acetate copolymer in a ratio of 1: 1 as a charge generation layer, and then coating the mixture with a polycarbonate and hydrazone material as a charge transfer layer to form Respectively.

[Comparative Example]

The cut cylindrical aluminum substrate was treated with a degreasing agent (manufacturer: DIPSOL product name: AL-47, 30 g / l) for 4 minutes at 40 캜 in combination with ultrasonic waves.

After the degreasing process, the aluminum substrate was cleaned using purified water at 60 캜, and then treated with an etching solution consisting of 25% sulfuric acid, 5% phosphoric acid, 0.2% by weight triethanolamine and the rest in deionized water at 40 占 폚 for 1 minute.

After the etching treatment, the aluminum substrate was cleaned using purified water at 60 占 폚.

15% by weight of sulfuric acid, oxalic acid, 0.3% by weight and the rest is a temperature of the electrolytic solution by using an electrolyte solution consisting of de-ionized water and maintained at 20 ± 1 ℃, current density is oxidized anode 20 minutes to a DC 1.0 ± 0.3 A / dm ² An average thickness of 5 탆 was formed.

Nickel acetate at a concentration of 7 g / l as a sealing agent for sealing treatment was performed at 30 ° C for 5 minutes. After ultrasonic washing twice with deionized water at 60 캜, it was dried at 120 캜 for 12 minutes in a dryer to remove moisture.

The photoconductor layer was formed in the same manner as in the above example.

2 is a SEM photograph of the surface of the aluminum substrate after the degreasing process in the above-described embodiment and comparative example.

3 is a SEM photograph of the surface of the aluminum substrate after the etching process in the above embodiment.

4 is a SEM photograph of a surface of an aluminum substrate subjected to an anodizing process in the above comparative example.

Compared to FIG. 3 (Example) and FIG. 4 (Comparative Example) on the basis of FIG. 2, the surface is smooth in FIG. 4 (Comparative Example), but many pinholes are formed on the surface. 3, the degree of smoothness of the surface is less than that of FIG. 4, but pinholes hardly occur.

On the other hand, in order to compare the surface treatment effects of Figs. 3 and 4, the surface potentials of the photoconductor layers of Examples and Comparative Examples were measured, and the charge potential difference between the first rotation and the second rotation after the initial time and 100,000 copies were measured, And the results are shown in Table 1.

Early After 100,000 copies Primary rotation
electric potential 2nd rotation
electric potential Potentiometer burn Primary rotation
electric potential 2nd rotation
electric potential Potentiometer burn Example -530 -538 8 Good -523 -535 12 Good Comparative Example -539 -549 10 Good -533 -547 14 Good

Referring to Table 1, it can be seen that the primary and secondary rotation potential differences after the initial and long-term use are remarkably small even in the case of the comparative example, and blurred image coupling did not appear in the image.

Claims (6)

A degreasing step of degreasing the cylindrical aluminum substrate;
An etching step of immersing the cylindrical aluminum substrate degreased by the degreasing process in an etching solution containing sulfuric acid at a temperature of 2 ° C to 12 ° C to uniformly treat the surface of the cylindrical aluminum substrate;
A washing step of washing the cylindrical aluminum substrate subjected to the etching treatment by the etching step with water; And
And a photoconductor forming step of applying a photosensitive coating material to the outer surface of the cylindrical aluminum substrate washed by the water washing step and thermally curing the photosensitive coating material,
In the etching step, the etching solution is prepared by diluting sulfuric acid to a concentration of 10 to 20%
Wherein the etching process is performed within a time range of 15 minutes to 20 minutes without application of an electric current,
The etchant may be at least one selected from the group consisting of phosphoric acid, ethanolamine, diethanolamine, triethanolamine, 2-amino-2-methyl-2-propanol, Propanol and 1-amino-pentanol are added and prepared,
Wherein the step of forming an anodizing film on the surface of the aluminum base material by anodic oxidation is not performed in order to improve the adhesion between the cylindrical aluminum base material and the photosensitive paint. Gt;

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