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Developing roller and imaging equipment

A developing roller and elastic rubber technology, which is applied in the field of imaging equipment, can solve the problems of print quality degradation, pollution of photosensitive drums, poor conductivity, etc., and achieve the effect of high charge, good conductivity, and easy detachment

Active Publication Date: 2016-04-20
SHENZHEN LEPUTAI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, people used polyurethane resin as the surface layer of the developing roller to achieve a method of improving the friction coefficient of the developing roller, but as we all know, the friction coefficient of polyurethane is relatively large, and it will generate a lot of heat during long-term printing, which will cause the toner to become soft and stick On the developing roller and OPC, the printing quality will decline, and the conductivity of the polyurethane resin is very poor. Usually, a large amount of conductive substances need to be added to adjust the conductivity of the resin. If an electronic conductive agent such as carbon black is used, with the increase of the conductive substance Adding it will increase the hardness of the resin coating, which will cause the toner to easily form a film on the surface of the rubber roller during the printing process of the toner, and at the same time, the durability and adhesion of the rubber roller will decrease.
Therefore, the printing durability is greatly reduced. If an ion conductive agent is used, the precipitation of small molecule conductive agent may contaminate the photosensitive drum.
[0005] In order to solve the above problems, the patent document CN1203385A disclosed by the Chinese Patent Office proposes to use silicon-modified acrylic resin as the surface layer of the rubber roller to reduce the friction coefficient of the rubber roller and prevent the toner from softening, but the toner charge of this resin is very low.

Method used

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  • Developing roller and imaging equipment
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  • Developing roller and imaging equipment

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0030] The preparation method of antistatic coating of the present invention:

[0031] 1) Place the cationic modified styrene-acrylate resin emulsion prepared above in a wide-mouthed container with a cover, and start stirring at 300-500rpm;

[0032] 2) Add deionized water and water-based paint additives according to the ratio under the condition of stirring, and keep stirring for 15-30min;

[0033] 3) Continue to add polytetrafluoroethylene emulsion according to the proportion under the condition of stirring, and keep stirring for 10-25min, and discharge.

[0034] The preparation method of developing roller of the present invention:

[0035] 1) Use a closed type rubber mixing machine or an open type rubber mixing machine to masticate nitrile rubber and butadiene rubber, and then mix zinc oxide with a quality of 1%-8%wt of the total rubber mass and stearin with a quality of 1%-5%wt Acid, 10%-30%wt of calcium carbonate, 5%-40%wt of carbon black, and 1%-5%wt of sulfur are put i...

Embodiment 1

[0043] 1. Preparation of cationic modified styrene-acrylate resin emulsion:

[0044] 1) Weigh 70 parts by weight of styrene, 42 parts of butyl acrylate, 2.24 parts of n-dodecanethiol, 10 parts of methacryloyloxyethyltrimethylammonium chloride, and then account for the total amount of styrene and butyl acrylate. 3.5% by weight of nonionic surfactant and deionized water accounting for 80% of the total weight of styrene and butyl acrylate are placed in the reactor, stirred and heated to 50°C-70°C;

[0045] 2) take by weighing the initiator azobisisobutylamidine hydrochloride that weight is 1.5% of styrene, butyl acrylate and methacryloyloxyethyltrimethylammonium chloride gross weight, then azobisisobutylamidine 70%wt of the total amount of amidine hydrochloride was added to the reactor, and after 3-5 minutes, 70 parts by weight of styrene, 42 parts of butyl acrylate and 10 parts of methacryloyloxyethyltrimethylammonium chloride were added dropwise. 2.24 parts of n-dodecanethiol,...

Embodiment 2

[0060] In this embodiment, except that the resin II used in the surface layer is different from that of Embodiment 1, the rest are the same as in Embodiment 1.

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Abstract

The invention relates to a developing roller. The developing roller comprises a metal shaft core, an elastic rubber layer covering the periphery of the metal shaft core and a surface layer covering the outer surface of the elastic rubber layer, wherein the elastic rubber layer is mainly formed by compounding butadiene rubber and nitrile rubber, the volume resistance of the elastic rubber layer is 103-1012 ohm.cm, wherein the butadiene rubber accounts for 50-90%wt of the total mass of the elastic rubber layer; the surface layer is a cationic modified water-based antistatic coating layer formed by styrene-acrylate resin, and the volume resistance of the surface layer is 105-1012 ohm.cm. The surface layer of the developing roller selects the cationic modified styrene-acrylate resin as a water-based antistatic coating, so that good electrical conductivity can be maintained without an additional conductive agent, higher electrical quantity can be provided for powdered ink, and the powdered ink can be easily separated and cannot pollute a photosensitive drum after being placed for a long time. The prepared developing roller has the characteristics of enabling the electrical quantity of the powdered ink to be higher, not polluting the photosensitive drum and the like so as to prevent the occurrence of printing defects such as backgrounclig and ghosting.

Description

【Technical field】 [0001] The invention relates to the technical field of imaging equipment, in particular to a developing roller and imaging equipment used in printers and copiers to transfer toner to an electrostatic latent image bearing structure (photosensitive drum) so that the electrostatic latent image forms a visible toner image. 【Background technique】 [0002] Printers and copiers are built with electrostatic latent images (also known as photosensitive drums), charging rollers that charge the photosensitive drums, developing rollers that transfer toner to the photosensitive drums so that the electrostatic latent images form visible toner images, and transfer the toner to the photosensitive drums. It consists of conductive rubber rollers such as transfer rollers that transfer the photosensitive drum to other media. [0003] In recent years, imaging devices represented by printers have been widely popularized in people's daily life, and miniaturization of printers has ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G15/08
Inventor 曹方敏刘志军李绍昌羊辉
Owner SHENZHEN LEPUTAI TECH CO LTD