JPH07134433A - Cylindrical substrate for electrophotographic photoreceptor and its production - Google Patents

Abstract

PURPOSE:To provide a technique by which a superior copied image is formed. CONSTITUTION:This cylindrical substrate is made of an Al alloy contg. 0.01-0.13wt.% Si, 0.55-0.70wt.% Fe, 0.10-0.16wt.% Cu and <=0.05wt.% Mn, Mg, Cr, Zn and Ti as inevitable impurities.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical substrate for an electrophotographic photoreceptor and a method for producing the same.

[0002]

BACKGROUND OF THE INVENTION Electrophotographic copying machine photoreceptors having a photosensitive layer on a conductive cylindrical substrate are widely used.
Aluminum alloy is widely adopted as the material of the conductive cylindrical substrate. That is, after extruding an aluminum alloy, drawing it, cutting the obtained tubular material into a predetermined length, and then turning the surface with a cutting tool such as a diamond bite, a cylinder for an electrophotographic photoreceptor. A substrate is being made.

By the way, the aluminum alloy which constitutes the cylindrical substrate for the electrophotographic photosensitive member is usually made of Si, Mg, Cu,
It is an aluminum alloy to which an element such as Mn is added.
However, aluminum has an extremely low solid solubility limit of the alloying elements described above, and has a wide solid-liquid coexistence temperature range, so that even if it is a hypoeutectic composition, it cannot maintain a state close to an equilibrium state during solidification. , Segregation eutectic occurs, and an intermetallic compound, a solid solution thereof, or a metal phase (such as Si phase) is precipitated or crystallized. And, it was found that these precipitate phase and crystallized phase are harder than the base aluminum and cause defects such as scratches during the turning process, which deteriorates the surface quality and causes image defects. I came.

For example, it has been found that the 3003 alloy has good machinability, but the surface properties of the 3003 alloy cylindrical substrate are not good. That is, 3003
The alloy contains Mn. The eutectic point of the Al-Mn system is 1.82 wt% Mn, and Mn is the Al phase (α
Phase 6) is hardly solid-solved, and a coarse Al ₆ Mn phase is precipitated. Such intermetallic compounds are hard and fall off during turning to form recesses on the surface, which may cause scratches on the surface, or they may be scattered in islands. It will decrease.

In addition to the above Al ₆ Mn, Fe contained as an alloy component comes to form an intermetallic compound such as FeAl ₃ , which causes deterioration in surface properties. Also, Al ₃ Mg ₂ phase, Al ₈ Mg ₅ phase, M
An intermetallic compound such as a g ₂ Si phase or a CuAl ₂ phase is formed, which causes deterioration of the surface quality.

Further, when used as a photoreceptor, defects are formed in the natural oxide film formed on the surface of aluminum, and non-uniform portions are formed in the electrical characteristics of the surface, resulting in dot image defects in the copied image. The problem that occurs occurs.

[0007]

DISCLOSURE OF THE INVENTION An object of the present invention is to provide a technique capable of obtaining an excellent copied image. The purpose of this invention is
Si content is 0.01 to 0.13% by weight, Fe content is 0.55 to 0.70% by weight, and Cu content is 0.10 to 0% by weight.
0.16% by weight, Mn and M as other unavoidable impurities
This is achieved by a cylindrical substrate for an electrophotographic photosensitive member, characterized in that it is made of an aluminum alloy in which the content of each component of g, Cr, Zn, Ti is 0.05% by weight or less.

Further, the Si content is 0.01 to 0.13% by weight, the Fe content is 0.55 to 0.70% by weight, the Cu content is 0.10 to 0.16% by weight, and other inevitable. After extruding an aluminum alloy extruded tube containing 0.05% by weight or less of each component of Mn, Mg, Cr, Zn, and Ti as impurities, curling, ironing, and removing end portions The present invention is achieved by a method of manufacturing a cylindrical substrate for an electrophotographic photosensitive member, which is characterized by performing turning.

That is, the Si content is 0.01 to 0.1.
3% by weight, Fe content of 0.55 to 0.70% by weight, and Cu content of 0.10 to 0.16% by weight
And other unavoidable impurities such as Mn, Mg,
Since the content of each component of Cr, Zn and Ti is set to 0.05% by weight or less (particularly less than 0.05% by weight), Al ₆ M
n, FeAl ₃ , Al ₃ Mg ₂ , Al ₈ Mg ₅ , Mg ₂
Since intermetallic compounds such as Si and CuAl ₂ are not formed, and the deterioration of the surface properties due to this is less likely to occur, image defects are less likely to occur, so that an excellent copied image can be obtained. Become.

Further, according to the present invention, it is possible to obtain a cylindrical substrate for an electrophotographic photosensitive member which is free from image defects caused by an intermetallic compound and has excellent dimensional accuracy. Excellent copy images are obtained. The ironing process in the above invention is preferably a reduction of 40 to 80%. That is, when the reduction due to the ironing process is lower than 40%, the machinability deteriorates, and it is difficult to perform the cutting process with high mirror surface accuracy.
When the reduction is higher than 80%, deformation is likely to occur due to stress release after cutting and it is difficult to obtain high dimensional accuracy. Therefore, the ironing is preferably performed at 40-80% reduction. In particular, the reduction is preferably 60 to 70%.

[0011]

【Example】

[Example 1] Si is 0.13 wt% and Fe is 0.60 w
t%, Cu 0.10 wt%, Mn less than 0.05 wt%, Mg less than 0.05 wt%, Cr 0.05 wt%
Less, Zn less than 0.05 wt%, Ti 0.05 wt
% Extruded using an aluminum alloy of which the remainder is Al, and an extruded pipe having an outer diameter of 66 mm and a wall thickness of 4 mm was obtained, and this extruded pipe was cut to a length of 100 mm.

One end of this 100 mm pipe was subjected to curling and then subjected to ironing with a reduction of 60%, after which both ends were cut and processed into a drum having an outer diameter of 60 mm and a wall thickness of 1.6 mm. Then, this drum was subjected to a turning process of 500 μm or less to obtain a cylindrical substrate for an electrophotographic photosensitive member.

The cylindrical substrate for an electrophotographic photoreceptor thus obtained is degreased, washed and dried, and then an undercoat layer made of a vinyl chloride resin such as a vinyl chloride-vinyl acetate-maleic anhydride copolymer. To a thickness of 0.05 μm. Next, a coating material in which a bisazo pigment and a binder resin are dispersed / dissolved is applied onto the undercoat layer to give a dry thickness of 0.4 μm.
Of the charge generation layer. Further, a coating material in which a styryl compound and a polycarbonate resin were dispersed / dissolved was applied onto the charge generation layer, and a charge transport layer having a dry thickness of 18 μm was provided to prepare an electrophotographic photoreceptor.

[Example 2] A cylindrical substrate for an electrophotographic photosensitive member was obtained in the same manner as in Example 1 except that the reduction during ironing was 70%, and a similar undercoat layer was formed on this cylindrical substrate. A charge generation layer and a charge transport layer were provided to prepare an electrophotographic photoreceptor. [Example 3] In Example 1, Si was 0.10 wt.
%, Fe 0.60 wt%, Cu 0.10 wt%, M
n is less than 0.05 wt%, Mg is less than 0.05 wt%,
An aluminum alloy of Cr is less than 0.05 wt%, Zn is less than 0.05 wt%, Ti is less than 0.05 wt%, and the rest is Al to obtain a cylindrical substrate for an electrophotographic photosensitive member. A similar undercoat layer, charge generation layer, and charge transport layer were provided to prepare a photoconductor for electrophotography.

Example 4 In Example 1, 0.10 wt% of Si, 0.70 wt% of Fe, and 0.1% of Cu are used.
0 wt%, Mn less than 0.05 wt%, Mg 0.05
less than wt%, Cr less than 0.05 wt%, Zn 0.0
Less than 5 wt%, Ti less than 0.05 wt%, balance Al
The same procedure is performed using the aluminum alloy described in 1. above to obtain a cylindrical substrate for an electrophotographic photoreceptor, and the same undercoat layer, charge generation layer, and charge transport layer are provided on the cylindrical substrate to prepare an electrophotographic photoreceptor. did.

Comparative Example 1 In Example 1, Si was 0.25 wt%, Fe was 0.50 wt%, and Cu was 0.1.
0 wt%, Mn less than 0.05 wt%, Mg 0.05
less than wt%, Cr less than 0.05 wt%, Zn 0.0
Less than 5 wt%, Ti less than 0.05 wt%, balance Al
The same procedure is performed using the aluminum alloy described in 1. above to obtain a cylindrical substrate for an electrophotographic photoreceptor, and the same undercoat layer, charge generation layer, and charge transport layer are provided on the cylindrical substrate to prepare an electrophotographic photoreceptor. did.

[Comparative Example 2] In Example 1, Si is 0.10 wt%, Fe is 1.50 wt%, and Cu is 0.1.
0 wt%, Mn less than 0.05 wt%, Mg 0.05
less than wt%, Cr less than 0.05 wt%, Zn 0.0
Less than 5 wt%, Ti less than 0.05 wt%, balance Al
The same procedure is performed using the aluminum alloy described in 1. above to obtain a cylindrical substrate for an electrophotographic photoreceptor, and the same undercoat layer, charge generation layer, and charge transport layer are provided on the cylindrical substrate to prepare an electrophotographic photoreceptor. did.

Comparative Example 3 In Example 1, Si is 0.10 wt%, Fe is 0.50 wt%, and Cu is 0.3.
0 wt%, Mn less than 0.05 wt%, Mg 0.05
less than wt%, Cr less than 0.05 wt%, Zn 0.0
Less than 5 wt%, Ti less than 0.05 wt%, balance Al
The same procedure is performed using the aluminum alloy described above to obtain a cylindrical substrate for an electrophotographic photoreceptor, and the same undercoat layer, charge generation layer, and charge transport layer are provided on the cylindrical substrate to prepare an electrophotographic photoreceptor. did.

[Comparative Example 4] In Example 1, Si was 0.10 wt%, Fe was 0.60 wt%, and Cu was 0.1.
0wt%, Mn 0.10wt%, Mg 0.05wt
%, Cr less than 0.05 wt%, Zn 0.05 w
An aluminum alloy of less than t%, less than 0.05 wt% of Ti, and the rest of Al is similarly used to obtain a cylindrical substrate for an electrophotographic photoreceptor, and a similar undercoat layer and charge generation layer are formed on the cylindrical substrate. , And a charge transport layer were provided to prepare an electrophotographic photoreceptor.

[Comparative Example 5] In Example 1, Si was 0.10 wt%, Fe was 0.60 wt%, and Cu was 0.1.
0 wt%, Mn less than 0.05 wt%, Mg 0.10
wt%, Cr less than 0.05 wt%, Zn 0.05 w
An aluminum alloy of less than t%, less than 0.05 wt% of Ti, and the rest of Al is similarly used to obtain a cylindrical substrate for an electrophotographic photoreceptor, and a similar undercoat layer and charge generation layer are formed on the cylindrical substrate. , And a charge transport layer were provided to prepare an electrophotographic photoreceptor.

[Comparative Example 6] In Example 1, Si was 0.10 wt%, Fe was 0.60 wt%, and Cu was 0.1.
0 wt%, Mn less than 0.05 wt%, Mg 0.05
less than wt%, Cr 0.10 wt%, Zn 0.05 w
An aluminum alloy of less than t%, less than 0.05 wt% of Ti, and the rest of Al is similarly used to obtain a cylindrical substrate for an electrophotographic photoreceptor, and a similar undercoat layer and charge generation layer are formed on the cylindrical substrate. , And a charge transport layer were provided to prepare an electrophotographic photoreceptor.

[Comparative Example 7] In Example 1, Si was 0.10 wt%, Fe was 0.60 wt%, and Cu was 0.1.
0 wt%, Mn less than 0.05 wt%, Mg 0.05
less than wt%, Cr less than 0.05 wt%, Zn 0.1
An aluminum alloy of 0 wt%, less than 0.05 wt% of Ti, and the rest of Al is similarly used to obtain a cylindrical substrate for an electrophotographic photosensitive member, and a similar undercoat layer, charge generation layer, and And a charge transport layer were provided to prepare an electrophotographic photoreceptor.

[Comparative Example 8] In Example 1, Si was 0.10 wt%, Fe was 0.60 wt%, and Cu was 0.1.
0 wt%, Mn less than 0.05 wt%, Mg 0.05
less than wt%, Cr less than 0.05 wt%, Zn 0.0
An aluminum alloy of less than 5 wt%, 0.10 wt% of Ti, and the rest of Al is similarly used to obtain a cylindrical substrate for an electrophotographic photoreceptor, and a similar undercoat layer, charge generation layer, and And a charge transport layer were provided to prepare an electrophotographic photoreceptor.

[Comparative Example 9] In Example 1, Si was 0.60 wt%, Fe was 0.70 wt%, and Cu was 0.1.
0 wt%, Mn less than 1.30 wt%, Mg 0.05
less than wt%, Cr less than 0.05 wt%, Zn 0.1
An aluminum alloy (JIS3003 alloy) of 0 wt%, less than 0.05 wt% of Ti, and the balance of Al is used in the same manner to obtain a cylindrical substrate for an electrophotographic photosensitive member, and a similar undercoat layer is formed on the cylindrical substrate. A charge generation layer and a charge transport layer were provided to prepare an electrophotographic photoreceptor.

[Comparative Example 10] In Example 1, Si was 0.40 wt%, Fe was 0.35 wt%, and Cu was 0.1.
0 wt%, Mn less than 0.10 wt%, Mg 0.65
wt%, Cr 0.10 wt%, Zn 0.10 wt
%, Ti 0.10 wt% and the balance Al is used in the same manner to obtain a cylindrical substrate for an electrophotographic photosensitive member, and a similar undercoat layer and charge generation on this cylindrical substrate. A layer and a charge transport layer were provided to prepare an electrophotographic photoreceptor.

[Comparative Example 11] In Example 1, Si was 0.60 wt%, Fe was 0.70 wt%, and Cu was 0.1.
0 wt%, Mn less than 1.30 wt%, Mg 0.05
less than wt%, Cr less than 0.05 wt%, Zn 0.1
Extruded using an aluminum alloy (JIS3003 alloy) of 0 wt%, less than 0.05 wt% of Ti, and the rest of Al to obtain an extruded pipe with an outer diameter of 66 mm and a wall thickness of 4 mm. Disconnected.

Reduction 2 for this 3 m pipe
Cold drawn twice at 5%, outer diameter 64.5m
m, wall thickness 2.25 mm, length 6 m and cut into 340 mm drums. Then, the drum is subjected to a turning process of 600 μm or less to obtain a cylindrical substrate for an electrophotographic photosensitive member, and the same undercoat layer, charge generation layer, and charge transport layer are provided on the cylindrical substrate, and electrophotography is performed. A photoconductor for use was prepared.

[Comparative Example 12] In Example 1, Si was 0.40 wt%, Fe was 0.35 wt%, and Cu was 0.1.
0 wt%, Mn less than 0.10 wt%, Mg 0.65
wt%, Cr 0.10 wt%, Zn 0.10 wt
%, Ti 0.10 wt%, and the rest Al is extruded using an aluminum alloy (JIS6063 alloy) to obtain an extruded pipe having an outer diameter of 66 mm and a wall thickness of 4 mm, which was cut into a length of 3 m. .

Reduction 2 for this 3 m pipe
Cold drawn twice at 5%, outer diameter 64.5m
m, wall thickness 2.25 mm, length 6 m and cut into 340 mm drums. Then, the drum is subjected to a turning process of 600 μm or less to obtain a cylindrical substrate for an electrophotographic photosensitive member, and the same undercoat layer, charge generation layer, and charge transport layer are provided on the cylindrical substrate, and electrophotography is performed. A photoconductor for use was prepared.

[Characteristics] The electrophotographic photosensitive member obtained as described above was incorporated into a copying machine and image defects were evaluated. The results are shown in Table 1. Further, turning workability and dimensional accuracy (roundness, straightness, etc.) of the cylindrical substrate for electrophotographic photosensitive member of each example were also investigated, and these are also shown in Table 1.

Table-1 Image Defects Turning Machinability Dimensional Accuracy Example 1 None Good Good Example 2 None Good Good Example 3 No Good Good Example 4 No Good Good Comparative Example 1 Yes Good Good Comparative Example 2 Yes Good Good Good Comparison Example 3 Yes Yes Good Good Comparative Example 4 Yes Good Good Comparative Example 5 Yes Good Good Comparative Example 6 Yes Good Good Good Comparative Example 7 Yes Good Good Comparative Example 8 Yes Good Good Comparative Example 9 Yes Good Good Comparative Example 10 Yes Good Good Comparative Example 11 With Defect Defect Comparative Example 12 With Defect Defect According to this, according to the present invention, an image defect is unlikely to occur, and the turning processability is good, and the manufacturing is easy, and further, it is a perfect circle. It can be seen that the dimensional accuracy such as the degree of straightness and the straightness is high, and an accurate and beautiful copied image can be obtained.

[0032]

[Effect] Image defects are unlikely to occur, the turning property is good, the manufacturing is easy, and the dimensional accuracy such as roundness and straightness is high, and accurate and beautiful copying can be performed.

Claims (3)

[Claims] 1. A Si content of 0.01 to 0.13% by weight, an Fe content of 0.55 to 0.70% by weight, a Cu content of 0.10 to 0.16% by weight, and other unavoidable items. A cylindrical substrate for an electrophotographic photosensitive member, comprising an aluminum alloy in which the content of each component of Mn, Mg, Cr, Zn, and Ti as an impurity is 0.05 wt% or less. 2. The Si content is 0.01 to 0.13% by weight, the Fe content is 0.55 to 0.70% by weight, the Cu content is 0.10 to 0.16% by weight, and other unavoidable. After extruding an aluminum alloy extruded tube containing 0.05% by weight or less of each component of Mn, Mg, Cr, Zn, and Ti as impurities, curling, ironing, and removing end portions A method for manufacturing a cylindrical substrate for an electrophotographic photosensitive member, which comprises performing a turning process. 3. The method for producing a cylindrical substrate for an electrophotographic photosensitive member according to claim 2, wherein the ironing process is a reduction of 40 to 80%.