CN107239009B - Organic photoconductor coating method and super-thick organic photoconductor prepared by the same - Google Patents

Organic photoconductor coating method and super-thick organic photoconductor prepared by the same Download PDF

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CN107239009B
CN107239009B CN201710475807.4A CN201710475807A CN107239009B CN 107239009 B CN107239009 B CN 107239009B CN 201710475807 A CN201710475807 A CN 201710475807A CN 107239009 B CN107239009 B CN 107239009B
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organic photoconductor
coating
solvent
solution
transport layer
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CN107239009A (en
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余荣清
张培兴
曹蕾
葛美珍
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SUZHOU GOLDENGREEN TECHNOLOGIES Ltd
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SUZHOU GOLDENGREEN TECHNOLOGIES Ltd
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
    • G03G5/02—Charge-receiving layers
    • G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
    • G03G5/06—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor characterised by the photoconductive material being organic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D125/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Coating compositions based on derivatives of such polymers
    • C09D125/02—Homopolymers or copolymers of hydrocarbons
    • C09D125/04—Homopolymers or copolymers of styrene
    • C09D125/08—Copolymers of styrene
    • C09D125/14—Copolymers of styrene with unsaturated esters
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D129/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Coating compositions based on hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Coating compositions based on derivatives of such polymers
    • C09D129/14—Homopolymers or copolymers of acetals or ketals obtained by polymerisation of unsaturated acetals or ketals or by after-treatment of polymers of unsaturated alcohols
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
    • G03G5/02—Charge-receiving layers
    • G03G5/04—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
    • G03G5/06—Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor characterised by the photoconductive material being organic
    • G03G5/07—Polymeric photoconductive materials
    • G03G5/071—Polymeric photoconductive materials obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/16—Nitrogen-containing compounds
    • C08K5/34—Heterocyclic compounds having nitrogen in the ring
    • C08K5/3467—Heterocyclic compounds having nitrogen in the ring having more than two nitrogen atoms in the ring
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend

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  • Engineering & Computer Science (AREA)
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  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
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Abstract

The invention discloses an organic photoconductor coating method, which adopts high molecular weight styrene acrylate copolymer to be dissolved in film forming agent solution to prepare charge transport layer coating, and polyacrylamide and aromatic polyamide are added into the charge transport layer coating. The invention has the following beneficial effects: the conductivity of electric charges is remarkably improved, the printing definition and the resolution ratio are improved, the high-speed printing of the organic photoconductor in the high-speed color digital laser composite all-in-one machine is realized, and the service life of the organic photoconductor is prolonged.

Description

Organic photoconductor coating method and super-thick organic photoconductor prepared by the same
Technical Field
The present invention relates to an organic photoconductor for OPC, and more particularly to an organic photoconductor coating method and an organic photoconductor obtained by the same.
Background
At present, Organic Photoconductors (OPC) used in high-speed color digital laser composite all-in-one machines in the market generally adopt a function-separated multilayer structure, namely, a charge blocking layer (UCL), a Charge Generation Layer (CGL) and a Charge Transport Layer (CTL) are sequentially coated on a conductive aluminum tube base. The coating of each layer is generally composed of corresponding functional materials dissolved or dispersed in a solution containing film-forming resin (also called film-forming agent), and the coating can be carried out by adopting a dip coating, a spray coating or a blade coating mode, and then is dried to form a film layer.
The organic photoconductor is a consumable material, and the service life of the organic photoconductor is mainly determined by three factors, namely the chemical stability of the material, the function decay rate of photoelectric molecules and the mechanical property of a coating layer. Both research and practical results show that the mechanical properties of the coating layer are "short-lived plates" of organic photoconductors; in other words, the lifetime of the organic photoconductor depends on the mechanical wear resistance of the CTL. Because: in the working process of the high-speed color digital laser composite all-in-one machine, the organic photoconductor continuously rotates at high speed, the surface of the charge transmission layer of the high-speed color digital laser composite all-in-one machine has friction with various components or media, and the charge transmission layer is gradually abraded. Such mechanical abrasion to some extent deteriorates the photoelectric properties of the photoconductor such as a decrease in charge potential, an increase in dark decay rate, etc., and affects surface properties such as deterioration of smoothness, retention of toner, etc., resulting in serious printing problems.
For this problem, the main methods adopted at present mainly include: (1) for example, a lubricant (such as silicone oil) or a strong film agent (such as nano silicon oxide) is added into a CTL coating liquid formula disclosed in Chinese patent CN 102998916B; (2) an abrasion resistant resin (e.g., silicone) is applied to the outside of the charge transport layer. The method (1) is simple and easy to operate but requires special care, because silicone oil or silicon oxide and the like have poor compatibility with film-forming resin, improper use cannot achieve the effect, but the photoelectric property of the device is deteriorated; the method (2) complicates the manufacturing process of the organic photoconductor and increases the manufacturing cost of the product.
The existing organic light conductor coating has complex process during preparation, and the coating is not easy to store in the production process and is easy to have the problems of sedimentation, crystallization, solidification and the like which influence the use; or the original physical and chemical properties of the coating are destroyed in the existing preparation process, so that the used coating loses the due photoelectric property.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a coating method of an organic photoconductor, so that the prepared organic photoconductor has long service life and good charge conduction performance.
The purpose of the invention is realized by the following technical scheme:
an organic photoconductor coating method comprising the steps of:
s1, coating a charge blocking layer coating on the aluminum tube base of the organic photoconductor to form a charge blocking layer, wherein the charge blocking layer coating is prepared by the following steps: preparing nylon resin into a solution with the solid content of 3.5-5.5% by using a first solvent,
s2, coating a charge generation layer coating on the charge blocking layer to form a charge generation layer, the charge generation layer coating being prepared by: preparing solution with solid components of 3.5-5.5% by using a second solvent to prepare titanyl phthalocyanine and polyvinyl butyral resin,
s3, coating a charge transport layer coating on the charge generation layer to form a charge transport layer, the charge transport layer coating being prepared by:
s31, preparing a solution with the solid content of 30-40% by using a third solvent, wherein the mass ratio of styrene to butyl acrylate to trimethylsilyl methacrylate is 5-9:0.5-1:1-4, and the third solvent is a toluene solvent;
s32, slowly heating the solution to form crosslinking, and heating to 60-70 ℃ for 5 hours; naturally cooling to room temperature to obtain a synthetic resin solution, pouring the synthetic resin solution into methanol to separate out a precipitate, and performing suction filtration to obtain a synthetic resin filter cake;
s33, dissolving the synthetic resin filter cake in a dichloromethane-methanol system solution, performing suction filtration and purification for 3 times or more at room temperature, wherein the mass ratio of dichloromethane to methanol is 1:1-1.5, and performing suction filtration and drying to obtain a white powdery solid with a molecular weight range of 3.6-4.8 x 104The high molecular weight styrene acrylate copolymer of (a);
s34, mixing polyvinyl acetate and polycarbonate according to the mass ratio of 1: 9-3: 7, dissolving in a fourth solvent to form a film forming agent solution with the solid content of 5-10%, wherein cyclohexanone and tetrahydrofuran are mixed in the fourth solvent according to the mass ratio of 5:1-10: 1;
s35, dissolving the high molecular weight styrene acrylate copolymer prepared in the step S34 in the film forming agent solution to prepare the charge transport layer coating, wherein the mass ratio of the high molecular weight styrene acrylate copolymer to the film forming agent solution is 1: 0.75-0.8, and 0.6-1% by mass of polyacrylamide and aromatic polyamide are added into the charge transport layer coating, wherein the mass ratio of the polyacrylamide to the aromatic polyamide is 1: 1.5.
Preferably, in S31, an initiator is further added to the third solvent, and the initiator is azoisobutyronitrile accounting for 0.9% of the total solution by mass.
Preferably, in S35, the aromatic polyamide comprises one or more of polyparaphenylene terephthalamide PPTA, polyparaphenylene isophthalamide PMTA, and polyparaphenylene formamide PBA.
Preferably, in S1, titanium white, titanium yellow and nylon resin are added into the solution with the solid content of 3.5-5.5%; wherein the mass ratio of the titanium white to the titanium yellow is 1:1-2:1, and TiO is2The mass ratio of the nylon resin to the nylon resin is 1:1-2: 1.
Preferably, the first solvent is a mixture of methanol and n-butanol in a mass ratio of 7:3-4: 1.
Preferably, in S2, the mass ratio of the titanyl phthalocyanine to the polyvinyl butyral is 1:1-1.5: 1; the second solvent is cyclohexanone.
Preferably, the charge blocking layer prepared by S1 is 1.5-2 μm.
Preferably, the charge generation layer prepared by S2 is 0.1 to 0.5 μm.
Preferably, the charge transport layer prepared in S3 is 30 to 45 μm.
The invention also discloses an ultra-thick organic photoconductor which is prepared by the organic photoconductor coating method.
The invention also discloses an organic photoconductor which is prepared by the organic photoconductor coating method.
The invention has the following beneficial effects: the conductivity of electric charges is remarkably improved, the printing definition and the resolution ratio are improved, the high-speed printing of the organic photoconductor in the high-speed color digital laser composite all-in-one machine is realized, and the service life of the organic photoconductor is prolonged.
Detailed Description
The invention discloses an organic photoconductor coating method, which comprises the following steps:
s1, coating a charge blocking layer coating on the aluminum tube base of the organic photoconductor to form a charge blocking layer, wherein the charge blocking layer coating is prepared by the following steps: preparing nylon resin into a solution with the solid content of 3.5-5.5% by using a first solvent, and adding titanium white, titanium yellow and nylon resin into the solution with the solid content of 3.5-5.5%; wherein the mass ratio of the titanium white to the titanium yellow is 1:1-2:1, and TiO is2The mass ratio of the nylon resin to the nylon resin is 1:1-2: 1. The first mentionedThe first solvent is a mixture of methanol and n-butanol according to the mass ratio of 7:3-4: 1.
S2, coating a charge generation layer coating on the charge blocking layer to form a charge generation layer, the charge generation layer coating being prepared by: preparing solution with solid content of 3.5% -5.5% by using a second solvent, wherein the mass ratio of the titanyl phthalocyanine to the polyvinyl butyral is 1:1-1.5: 1; the second solvent is cyclohexanone.
S3, coating a charge transport layer coating on the charge generation layer to form a charge transport layer, the charge transport layer coating being prepared by:
s31, preparing a solution with the solid content of 30-40% by using a third solvent, wherein the mass ratio of styrene to butyl acrylate to trimethylsilyl methacrylate is 5-9:0.5-1:1-4, the third solvent is a toluene solvent, and an initiator can be added, and azoisobutyronitrile accounting for 0.9% of the total solution by mass ratio is adopted;
s32, slowly heating the solution to form crosslinking, and heating to 60-70 ℃ for 5 hours; naturally cooling to room temperature to obtain a synthetic resin solution, pouring the synthetic resin solution into methanol to separate out a precipitate, and performing suction filtration to obtain a synthetic resin filter cake;
s33, dissolving the synthetic resin filter cake in a dichloromethane-methanol system solution, performing suction filtration and purification for 3 times or more at room temperature, wherein the mass ratio of dichloromethane to methanol is 1:1-1.5, and performing suction filtration and drying to obtain a white powdery solid with a molecular weight range of 3.6-4.8 x 104The high molecular weight styrene acrylate copolymer of (a);
s34, mixing polyvinyl acetate and polycarbonate according to the mass ratio of 1: 9-3: 7, dissolving in a fourth solvent to form a film forming agent solution with the solid content of 5-10%, wherein cyclohexanone and tetrahydrofuran are mixed in the fourth solvent according to the mass ratio of 5:1-10: 1;
s35, dissolving the high molecular weight styrene acrylate copolymer prepared in the step S34 in the film forming agent solution to prepare the charge transport layer coating, wherein the mass ratio of the high molecular weight styrene acrylate copolymer to the film forming agent solution is 1: 0.75-0.8, and 0.6-1% by mass of polyacrylamide and aromatic polyamide are added into the charge transport layer coating, wherein the mass ratio of the polyacrylamide to the aromatic polyamide is 1: 1.5. The aromatic polyamide comprises one or more of poly (p-phenylene terephthalamide) PPTA, poly (m-phenylene isophthalamide) PMTA and poly (p-benzamide) PBA.
In the invention, the charge blocking layer is 1.5-2 μm, the charge generating layer is 0.1-0.5 μm, and the charge transport layer is 30-45 μm. The Polyacrylamide (PAM) is a water-soluble high-molecular polymer, is insoluble in most organic solvents, has good flocculation property, and can reduce the frictional resistance between liquids. The poly-p-benzoyl-p-phenylenediamine (PPTA) has small surface angle between benzene rings and is basically positioned on the same plane, so that the possibility of ring overlapping is higher, an electron transmission channel is more favorably formed, and the electron mobility along the pi-pi stacking direction is higher. Therefore, the charge conduction performance of the charge transmission layer can be greatly improved by adding the polyacrylamide and the arylamine polymer; moreover, due to the special coating method, the thickness of the charge transport layer is greatly increased, the wear resistance of the charge transport layer is improved, and the service life of the organic photoconductor is prolonged.
Example 1
Coating of a charge blocking layer: 100g of nylon resin, 30g of titanium dioxide, 20g of titanium yellow, 1600ml of methanol and 400ml of n-butyl alcohol are prepared into the coating with the solid content of about 5 percent.
A charge blocking layer was formed by applying a 1 μm thick coating on the aluminum tube-turned base.
Coating of the charge generation layer: 20g of polyvinyl butyral, 20g of gamma-type titanyl phthalocyanine and 1000ml of cyclohexanone are prepared into a coating material with a solid content of about 4%.
A charge generation layer was formed by coating the charge blocking layer with a thickness of about 0.5 μm.
Coating of a charge transport layer:
1) 175g of styrene, 35g of butyl acrylate, 140g of trimethylsilylpropyl methacrylate and 1000ml of toluene were prepared as a solution having a solid content of 35%. Adding 1.2g of azoisobutyronitrile into the solution, slowly heating the solution to form crosslinking, and heating to 60-70 ℃ for 5 hours; naturally cooling to room temperature to obtain a synthetic resin solution, pouring the synthetic resin solution into 1000ml of methanol to precipitate, and performing suction filtration to obtain a synthetic resin filter cake; 1000ml of dichloromethane and 1000ml of methanol, dissolving the synthetic resin filter cake in dichloromethane-methanol system solution, carrying out suction filtration and purification for 3 times at room temperature, and carrying out suction filtration and drying to obtain 300g of high molecular weight styrene acrylate copolymer.
2) 6g of polyvinyl acetate, 234g of polycarbonate, 2000ml of cyclohexanone and 400ml of tetrahydrofuran to form a film forming agent solution with solid parts of 10%. Adding 1) into a film-forming agent solution, and adding 8g of polyacrylamide and 8g of poly-p-phenylene terephthalamide to prepare the charge transport layer coating.
3) A charge transport layer was formed by coating the charge generation layer with a thickness of about 30 μm.
In the examples, methanol, n-butanol, tetrahydrofuran, cyclohexanone, toluene, dichloromethane, and methanol were all analytical grades.
After the three coatings are finally coated by adopting a conventional turned aluminum tube base, the appearance color of the organic photoconductor is green and opaque, the coating cost is 1.0 yuan/pcs, the tested electrical characteristics are shown in the following table, the blackness of the printed product is 1.45, the blackness value is 1.38 after the continuous service life is 5 ten thousand pages, and the surface abrasion phenomenon does not occur.
Example 2
The difference from example 1 is only that the specific gravity of the components in the charge transport layer coating is changed: polyvinyl acetate 12g and polycarbonate 228 g.
After the three coatings are finally coated by adopting a conventional turned aluminum tube base, the appearance color of the organic photoconductor is green and opaque, the coating cost is 1.0 yuan/pcs, the tested electrical characteristics are shown in the following table, the blackness of the printed product is 1.48, the blackness value is 1.38 after the continuous service life is 5 ten thousand pages, and the surface abrasion phenomenon does not occur.
Example 3
The difference from example 1 is only that the specific gravity of the components in the charge transport layer coating is changed: the charge transport layer coating was added with 12g of polyvinyl acetate and 228g of polycarbonate.
After the three coatings are finally coated by adopting a conventional turned aluminum tube base, the appearance color of the organic photoconductor is green and opaque, the coating cost is 1.0 yuan/pcs, the tested electrical characteristics are shown in the following table, the blackness of the printed product is 1.48, the blackness value is 1.38 after the continuous service life is 5 ten thousand pages, and the surface abrasion phenomenon does not occur.
Example 4
The difference from example 1 is only that the specific gravity of the components in the charge transport layer coating is changed: the charge transport layer coating is added with 18g of polyvinyl acetate and 222g of polycarbonate.
After the three coatings are finally coated by adopting a conventional turned aluminum tube base, the appearance color of the organic photoconductor is green and opaque, the coating cost is 1.0 yuan/pcs, the tested electrical characteristics are shown in the following table, the blackness of the printed product reaches 1.46, the blackness value after continuous service life is 5 ten thousand pages is 1.38, and the surface abrasion phenomenon does not occur.
Example 4
The difference from example 1 is only that the specific gravity of the components in the charge transport layer coating is changed: the charge transport layer coating is added with 24g of polyvinyl acetate and 216g of polycarbonate.
After the three coatings are finally coated by adopting a conventional turned aluminum tube base, the appearance color of the organic photoconductor is green and opaque, the coating cost is 1.0 yuan/pcs, the tested electrical characteristics are shown in the following table, the blackness of the printed product is 1.48, the blackness value is 1.35 after the continuous service life is 5 ten thousand pages, and the surface abrasion phenomenon is avoided.
Example 5
The difference from example 1 is only that the specific gravity of the components in the charge transport layer coating is changed: the charge transport layer coating is added with 30g of polyvinyl acetate and 210g of polycarbonate.
After the three coatings are finally coated by adopting a conventional turned aluminum tube base, the appearance color of the organic photoconductor is green and opaque, the coating cost is 1.0 yuan/pcs, the tested electrical characteristics are shown in the following table, the blackness of the printed product is 1.49, the blackness value is 1.35 after the continuous service life is 5 ten thousand pages, and the surface abrasion phenomenon is avoided.
Example 6
The difference from example 1 is only that the specific gravity of the components in the charge transport layer coating is changed: the charge transport layer coating is added with 36g of polyvinyl acetate and 204g of polycarbonate.
After the three coatings are finally coated by adopting a conventional turned aluminum tube base, the appearance color of the organic photoconductor is green and opaque, the coating cost is 1.0 yuan/pcs, the tested electrical characteristics are shown in the following table, the blackness of the printed product is 1.45, the blackness value is 1.38 after the continuous service life is 5 ten thousand pages, and the surface abrasion phenomenon does not occur.
Example 7
The difference from example 1 is only that the specific gravity of the components in the charge transport layer coating is changed: the charge transport layer coating was added with 42g of polyvinyl acetate and 198g of polycarbonate.
After the three coatings are finally coated by adopting a conventional turned aluminum tube base, the appearance color of the organic photoconductor is green and opaque, the coating cost is 1.0 yuan/pcs, the tested electrical characteristics are shown in the following table, the blackness of the printed product is 1.48, the blackness value is 1.37 after the continuous service life is 5 ten thousand pages, and the surface abrasion phenomenon is avoided.
Example 8
The difference from example 1 is only that the specific gravity of the components in the charge transport layer coating is changed: 48g of polyvinyl acetate and 192g of polycarbonate are added to the charge transport layer coating.
After the three coatings are finally coated by adopting a conventional turned aluminum tube base, the appearance color of the organic photoconductor is green and opaque, the coating cost is 1.0 yuan/pcs, the tested electrical characteristics are shown in the following table, the blackness of the printed product is 1.45, the blackness value is 1.37 after the continuous service life is 5 ten thousand pages, and the surface abrasion phenomenon is avoided.
Example 9
The difference from example 1 is only that the specific gravity of the components in the charge transport layer coating is changed: the charge transport layer coating was supplemented with 54g of polyvinyl acetate and 186g of polycarbonate.
After the three coatings are finally coated by adopting a conventional turned aluminum tube base, the appearance color of the organic photoconductor is green and opaque, the coating cost is 1.0 yuan/pcs, the tested electrical characteristics are shown in the following table, the blackness of the printed product is 1.49, the blackness value is 1.35 after the continuous service life is 5 ten thousand pages, and the surface abrasion phenomenon is avoided.
Example 10
The difference from example 1 is only that the specific gravity of the components in the charge transport layer coating is changed: 60g of polyvinyl acetate and 180g of polycarbonate are added in the charge transport layer coating.
After the three coatings are finally coated by adopting a conventional turned aluminum tube base, the appearance color of the organic photoconductor is green and opaque, the coating cost is 1.0 yuan/pcs, the tested electrical characteristics are shown in the following table, the blackness of the printed product is 1.48, the blackness value is 1.36 after the continuous service life is 5 ten thousand pages, and the surface abrasion phenomenon is avoided.
Example 11
The difference from example 1 is only that the specific gravity of the components in the charge transport layer coating is changed: the charge transport layer coating was supplemented with 66g of polyvinyl acetate and 174g of polycarbonate.
After the three coatings are finally coated by adopting a conventional turned aluminum tube base, the appearance color of the organic photoconductor is green and opaque, the coating cost is 1.0 yuan/pcs, the tested electrical characteristics are shown in the following table, the blackness of the printed product is 1.45, the blackness value is 1.34 after the continuous service life is 5 ten thousand pages, and the surface abrasion phenomenon is avoided.
Example 12
The difference from example 1 is only that the specific gravity of the components in the charge transport layer coating is changed: the charge transport layer coating material is added with 72g of polyvinyl acetate and 168g of polycarbonate.
After the three coatings are finally coated by adopting a conventional turned aluminum tube base, the appearance color of the organic photoconductor is green and opaque, the coating cost is 1.0 yuan/pcs, the tested electrical characteristics are shown in the following table, the blackness of the printed product is 1.47, the blackness value is 1.35 after the continuous service life is 5 ten thousand pages, and the surface abrasion phenomenon is avoided.
Figure DEST_PATH_IMAGE002
It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Claims (8)

1. An organic photoconductor coating method, characterized in that: the method comprises the following steps:
s1, coating a charge blocking layer coating on the aluminum tube base of the organic photoconductor to form a charge blocking layer, wherein the charge blocking layer coating is prepared by the following steps: preparing nylon resin into a solution with the solid content of 3.5-5.5% by using a first solvent,
s2, coating a charge generation layer coating on the charge blocking layer to form a charge generation layer, the charge generation layer coating being prepared by: preparing solution with solid components of 3.5-5.5% by using a second solvent to prepare titanyl phthalocyanine and polyvinyl butyral resin,
s3, coating a charge transport layer coating on the charge generation layer to form a charge transport layer, the charge transport layer coating being prepared by:
s31, preparing a solution with the solid content of 30-40% by using a third solvent, wherein the mass ratio of styrene to butyl acrylate to trimethylsilyl methacrylate is 5-9:0.5-1:1-4, and the third solvent is a toluene solvent;
s32, slowly heating the solution to form crosslinking, and heating to 60-70 ℃ for 5 hours; naturally cooling to room temperature to obtain a synthetic resin solution, pouring the synthetic resin solution into methanol to separate out a precipitate, and performing suction filtration to obtain a synthetic resin filter cake;
s33, dissolving the synthetic resin filter cake in a dichloromethane-methanol system solution, carrying out suction filtration and purification for 3 times or more at room temperature, wherein the mass ratio of dichloromethane to methanol is 1:1-1.5, and carrying out suction filtration and drying to obtain white powderSolid, with a molecular weight in the range of 3.6X 104-4.8×104The high molecular weight styrene acrylate copolymer of (a);
s34, mixing polyvinyl acetate and polycarbonate according to the mass ratio of 1: 9-3: 7, dissolving in a fourth solvent to form a film forming agent solution with the solid content of 5-10%, wherein cyclohexanone and tetrahydrofuran are mixed in the fourth solvent according to the mass ratio of 5:1-10: 1;
s35, dissolving the high molecular weight styrene acrylate copolymer prepared in the step S34 in the film forming agent solution to prepare the charge transport layer coating, wherein the mass ratio of the high molecular weight styrene acrylate copolymer to the film forming agent solution is 1: 0.75-0.8, and adding 0.6-1% by mass of polyacrylamide and aromatic polyamide into the charge transport layer coating, wherein the mass ratio of the polyacrylamide to the aromatic polyamide is 1:1.5, and the aromatic polyamide comprises one or more of poly (p-phenylene terephthalamide) PPTA, poly (m-phenylene isophthalamide) PMTA and poly (p-benzamide) PBA.
2. The organic photoconductor coating method as defined by claim 1, wherein: in S31, an initiator, namely azoisobutyronitrile accounting for 0.9% of the total solution by mass, is further added into the third solvent.
3. The organic photoconductor coating method as defined by claim 1, wherein: the first solvent is a mixture of methanol and n-butanol according to the mass ratio of 7:3-4: 1.
4. The organic photoconductor coating method as defined by claim 1, wherein: in S2, the mass ratio of the titanyl phthalocyanine to the polyvinyl butyral is 1:1-1.5: 1; the second solvent is cyclohexanone.
5. The organic photoconductor coating method as defined by claim 1, wherein: the charge blocking layer prepared by S1 is 1.5-2 μm.
6. The organic photoconductor coating method as defined by claim 1, wherein: the charge generation layer prepared by S2 was 0.1-0.5. mu.m.
7. The organic photoconductor coating method as defined by claim 1, wherein: the charge transport layer prepared by S3 was 30-45 μm.
8. An ultra-thick organic photoconductor characterized by: the organic photoconductor coating method as claimed in any one of claims 1 to 7.
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