Organic photoconductor drum multilayer coating process

Abstract

The invention discloses a multi-layer coating process for an organic photoconductor drum. The multi-layer coating process comprises the following steps: preparing a base material, coating a barrier layer I, coating a barrier layer II, coating a generation layer and coating a transmission layer, according to the invention, a composite structure of the colorless transparent barrier layer I and the pigment-containing barrier layer I is adopted, so that the charge blocking effect is enhanced, the interlayer adhesive force is improved, and the coating uniformity and performance optimization are realized by optimizing the coating speed, viscosity and drying conditions of each layer; and the conventional turning drum base is adopted to replace an expensive oxidation drum base, and the point-out problem is solved through the functional coating design, so that the production cost is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of photoconductor drum technology, specifically to a multilayer coating process for organic photoconductor drums. Background Technology

[0002] The organic photoconductor drum is a core component of laser printing equipment, and its performance directly depends on the design of the multilayer coating process and the selection of materials.

[0003] In traditional coating processes, coatings are prone to problems such as sedimentation, crystallization, and solidification, affecting their performance. Existing single-layer barrier layer designs have limited effectiveness in preventing charge injection, and the adhesion between the charge carrier generation layer and the substrate is insufficient, affecting yield and service life. Although some coating technologies have proposed the concept of four-layer coating, the problem of optimizing coating process parameters has not been solved. Some coating technologies also provide dip coating process parameters, but do not address the synergistic effects of multiple layers.

[0004] Therefore, in order to correct the above-mentioned defects, we propose a multilayer coating process for organic photoconductor drums. Summary of the Invention

[0005] The technical problem solved by this invention is to propose a multilayer coating process for organic photoconductor drums.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a multilayer coating process for an organic photoconductor drum, comprising the following steps: S1. Substrate preparation: The drum base is machined from conventional aluminum alloy and then cleaned, dusted, and degreased. S2, Coating Barrier Layer 1: Prepare a nylon resin solution, coat it on the substrate, and dry it at 80°C for 25 minutes to form a colorless and transparent layer; S3. Coating the second barrier layer: Prepare a solution of titanium dioxide, titanium yellow and nylon in the same solvent system, coat it on the first barrier layer, and dry it at 100°C for 20 minutes to form the second barrier layer. S4. Coating the production layer: Prepare a solution of phthalocyanine titanium oxide, polyvinyl butyral, tetrahydrofuran / cyclohexanone, coat it on the second barrier layer, and dry it at 90°C for 25 minutes to form the production layer. S5. Coating the transport layer: Prepare a dichloromethane / 1,2-dichloroethane solution of bisphenol Z-type polycarbonate and composite TPD, add 3-5% antioxidant, coat it on the production layer, and dry it at 110℃ for 50 minutes to form the transport layer.

[0007] Furthermore, in step S2, the solid content of the nylon resin solution is 3.5%-5.5%, and the solvent of the nylon resin solution is methanol / n-butanol, with a mass ratio of methanol / n-butanol of 7:3 to 4:1.

[0008] Furthermore, in step S3, the mass ratio of titanium dioxide, titanium yellow, and nylon resin is 1:1 to 2:1.

[0009] Furthermore, in step S4, the mass ratio of titanium phthalocyanine to polyvinyl butyral is 1:1 to 1.5:1, and the mass ratio of tetrahydrofuran to cyclohexanone is 5:1 to 10:1.

[0010] Furthermore, in step S5, the ratio of bisphenol Z-type polycarbonate to composite TPD is 1:0.65~0.8, the mass ratio of dichloromethane / 1,2-dichloroethane is 5:1~10:1, and the mass ratio of m-TPD to p-TPD in the composite TPD is 3:1~4:1.

[0011] Furthermore, during the application of the barrier layer, the lifting speed is 4.5-5.5 mm / s, the speed decreases by 0.25 mm / s every 40 mm, the temperature is 80-120℃, and the application time is 20-30 min. When the drum base contacts the liquid surface, the inner hole is connected to the atmosphere for 2-5 seconds.

[0012] Furthermore, during the application of the second barrier layer, the speed is increased to 4.5-5.5 mm / s, decreasing by 0.25 mm / s every 40 mm, at 250-320 cp, 80-120℃, for 20-30 minutes, and increasing by 0.5-2 mm / s when the coating is 5 mm from the tail.

[0013] Furthermore, during the coating process, the speed is increased to 2.5-4.5 mm / s, the speed decreases by 0.25 mm / s every 40 mm, the temperature is 150-250 cp, the temperature is 80-120℃, the coating time is 20-30 min, and the solid content of the coating liquid is 3.5-4.5%.

[0014] Furthermore, during the coating of the transport layer, the lifting speed is 3.5-5.0 mm / s, the speed decreases by 0.5 mm / s every 40 mm, the coating temperature is 100-120℃, and the coating liquid solid content is 18.5%±1% after 40-60 min at 300-450 cp.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention adopts a composite structure of a colorless transparent barrier layer and a pigment-containing barrier layer, which not only enhances the charge blocking effect but also improves the interlayer adhesion. By optimizing the coating speed, viscosity, and drying conditions of each layer, the uniformity and performance of the coating are optimized. Furthermore, the present invention uses a conventional machined drum base instead of an expensive oxidized drum base and solves the problem of charge leakage through functional coating design, thereby significantly reducing production costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the preparation process of the present invention. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] This invention provides a technical solution: Please see Figure 1 A multilayer coating process for an organic photoconductor drum is described, and its structure and process parameters are shown in Table 1-2 below.

[0019] Table 1 Material composition and mechanism of action of each functional layer

[0020] Table 2 Specific process parameters for each coating layer Example

[0021] S1. Substrate preparation: The drum base is machined from conventional aluminum alloy, and then cleaned, dusted, and degreased. S2. Coating barrier layer one: Prepare a nylon resin methanol / n-butanol (7:3) solution with 4.5% solids content, apply it at a lifting speed of 5mm / s, and dry it at 80℃ for 25 minutes to form a colorless and transparent layer with a thickness of about 0.8μm; S3. Coating barrier layer two: Prepare a solution of titanium dioxide: titanium yellow: nylon = 1.5:1:2 in the same solvent system, apply it at a lifting speed of 5 mm / s, and dry it at 100℃ for 20 minutes to form a barrier layer with a thickness of about 5 μm. S4. Coating to form a layer: Prepare a tetrahydrofuran / cyclohexanone (7:1) solution of phthalocyanine titanium oxide: polyvinyl butyral = 1.2:1, apply it at a lifting speed of 3.5 mm / s, and dry it at 90°C for 25 minutes to form a layer with a thickness of about 0.5 μm. S5. Coating the transport layer: Prepare a solution of bisphenol Z-type polycarbonate: composite TPD (m-TPD:p-TPD=3.5:1)=1:0.7 in dichloromethane / 1,2-dichloroethane (7:1), add 4% antioxidant, coat at a lifting speed of 4.5 mm / s, and dry at 110℃ for 50 minutes to form a transport layer with a thickness of about 25 μm.

[0022] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An organic photoconductor multi-layer coating process characterized by: It comprises the following steps: S1, substrate preparation: adopt conventional aluminum alloy turning drum base, clean dust and degrease treatment; S2, coating barrier layer one: configure nylon resin solution, coat on the substrate, dry at 80 DEG C for 25 minutes, form colorless transparent layer; S3, coating barrier layer two: prepare titanium white, titanium yellow, nylon solution of the same solvent system, coat on the barrier layer one, dry at 100 DEG C for 20 minutes, form barrier layer two; S4, coating generation layer: prepare phthalocyanine titanium oxide, polyvinyl butyral, tetrahydrofuran / cyclohexanone solution, coat on the barrier layer two, dry at 90 DEG C for 25 minutes, form generation layer; S5, coating transmission layer: prepare bisphenol Z type polycarbonate, composite TPD dichloromethane / 1,2-dichloroethane solution, add 3-5% antioxidant, coat on the generation layer, dry at 110 DEG C for 50 minutes, form transmission layer.

2. The organic photoconductor multi-layer coating process of claim 1, wherein: In the step S2, the solid content of the nylon resin solution is 3.5%-5.5%, the solvent of the nylon resin solution is methanol / n-butanol, and the mass ratio of methanol / n-butanol is 7:3~4:

1.

3. The organic photoconductor drum multi-layer coating process of claim 1, wherein: In the step S3, the mass ratio of titanium white, titanium yellow and nylon resin is 1:1~2:

1.

4. The organic photoconductor multi-layer coating process of claim 1 wherein: In the step S4, the mass ratio of phthalocyanine titanium oxide and polyvinyl butyral is 1:1~1.5:1, and the mass ratio of tetrahydrofuran / cyclohexanone is 5:1~10:

1.

5. The organic photoconductor multi-layer coating process of claim 1, wherein: In the step S5, the mass ratio of bisphenol Z type polycarbonate: composite TPD is 1:0.65~0.8, the mass ratio of dichloromethane / 1,2-dichloroethane is 5:1~10:1, and the mass ratio of m-TPD and p-TPD in composite TPD is 3:1~4:

1.

6. The organic photoconductor multi-layer coating process of claim 1 wherein: When coating the barrier layer one, the lifting speed is 4.5-5.5mm / s, the speed is reduced by 0.25mm / s every 40mm, 250-320cp, 80-120 DEG C, 20-30min, the inner hole is connected with the atmosphere for 2-5s when the drum base contacts the liquid surface.

7. The organic photoconductor multi-layer coating process of claim 1 wherein: When coating the barrier layer two, the lifting speed is 4.5-5.5mm / s, the speed is reduced by 0.25mm / s every 40mm, 250-320cp, 80-120 DEG C, 20-30min, the speed is increased by 0.5-2mm / s when 5mm away from the tail.

8. The organic photoconductor multi-layer coating process of claim 1 wherein: When coating the generation layer, the lifting speed is 2.5-4.5mm / s, the speed is reduced by 0.25mm / s every 40mm, 150-250cp, 80-120 DEG C, 20-30min, the solid content of coating liquid is 3.5-4.5%.

9. The organic photoconductor multi-layer coating process of claim 1 wherein: When coating the transmission layer, the lifting speed is 3.5-5.0mm / s, the speed is reduced by 0.5mm / s every 40mm, 300-450cp, 100-120 DEG C, 40-60min, the solid content of coating liquid is 18.5%±1%.

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