CN113960904A - Polyurethane water-based antistatic coating and preparation method of developing roller thereof - Google Patents
Polyurethane water-based antistatic coating and preparation method of developing roller thereof Download PDFInfo
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- CN113960904A CN113960904A CN202111271237.XA CN202111271237A CN113960904A CN 113960904 A CN113960904 A CN 113960904A CN 202111271237 A CN202111271237 A CN 202111271237A CN 113960904 A CN113960904 A CN 113960904A
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- developing roller
- microspheres
- antistatic coating
- acrylic resin
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Images
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/0806—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller
- G03G15/0818—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller characterised by the structure of the donor member, e.g. surface properties
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Dry Development In Electrophotography (AREA)
- Rolls And Other Rotary Bodies (AREA)
Abstract
The invention is suitable for the technical field of developing rollers, and provides a polyurethane water-based antistatic coating which comprises the following components in parts by weight: 50-70 wt% of polyurethane resin emulsion, 5-25 wt% of deionized water, 0.1-2 wt% of water-based paint additive, 0.5-5 wt% of ionic liquid, 3-10 wt% of conductive microspheres, 3-10 wt% of water-based nano diamond dispersion liquid, 1-8 wt% of polytetrafluoroethylene dispersion liquid, 1-3 wt% of graphite and 3-15 wt% of film-forming additive; the toner has high charge amount and high draft concentration, and can be easily separated, and long-term high-speed printing can not cause contamination of a photosensitive drum and a scraper to generate longitudinal ribs due to carbon powder melting.
Description
Technical Field
The invention belongs to the technical field of developing rollers, and particularly relates to a polyurethane water-based antistatic coating and a preparation method of the developing roller.
Background
In general, printers and copiers are each constituted by an electrically conductive rubber roller such as an electrostatic latent image bearing member (also referred to as a photosensitive drum), a charging roller for charging the photosensitive drum, a developing roller for transferring toner to the photosensitive drum to form an electrostatic latent image into a visible toner image, and a transfer roller for transferring toner from the photosensitive drum to another medium.
In recent years, image forming apparatuses represented by printers have been widely used in daily life, and the working processes of the printers mainly include six processes of charging, exposure, development, transfer, fixing, and cleaning. In the charging step, a conductive elastic roller having a voltage is pressed against the surface of the photoreceptor, and a device that rotates while contacting the photoreceptor to generate a charge charges the OPC belt with a predetermined charge. And exposing, namely exposing the OPC surface by utilizing the photoconductive characteristic of the OPC surface to form a charge area with a certain shape and different positions. Developing, wherein carbon powder particles are adsorbed on the exposed area on the OPC surface under the action of an electric field; transfer printing, when the printing paper passes through the transfer printing roller, the printing paper is charged with charges opposite to the carbon powder, so that the carbon powder particles are transferred to the paper according to a certain shape; for fixing, the toner particles on the printing paper on which the characters have been printed need to be melted to penetrate into the paper. Cleaning, wherein the carbon powder on the OPC surface is not completely cleaned by the transfer paper, and the next rotary printing imaging process can be completed after the carbon powder is cleaned by a scraper. The developing roller is a core component in the developing process in the developing link and plays a decisive role in the quality of printed drawings.
The current developing roller can not enable the toner to have higher charge quantity, the toner is not easy to separate from the surface of the developing roller, the concentration of the drawing draft is low, and long-term high-speed printing can cause contamination of a photosensitive drum and a scraper due to carbon powder melting to generate longitudinal ribs.
Disclosure of Invention
The invention provides a polyurethane aqueous antistatic coating and a preparation method of a developing roller thereof, aiming at solving the problems that the prior developing roller can not enable toner to have higher charge capacity, the toner is not easy to separate from the surface of the developing roller, the concentration of a picture draft is low, and long-term high-speed printing can stain a photosensitive drum and a scraper due to carbon powder melting to generate longitudinal ribs.
The invention is realized in such a way that a developing roller preparation method comprises the following steps: covering the outer layer of the metal shaft core 1 with an elastic layer 2; the surface layer 3 is covered on the outer layer of the elastic layer 2.
Preferably, the elastic layer 2 is a composite system of butadiene rubber and nitrile rubber; the cis-butadiene rubber accounts for 50-90% of the total mass of the rubber, and the volume resistance is controlled to be 103-108Ω.cm。
Preferably, the surface layer 3 is a polyurethane aqueous antistatic coating of conductive microspheres.
Preferably, the conductive microspheres are conductive microspheres of styrene modified acrylic resin; the conductive microspheres of the styrene modified acrylic resin are prepared by a suspension polymerization process; the Tg of the conductive microspheres of the styrene modified acrylic resin is controlled to be 100-130 ℃.
Preferably, the monomer of the conductive microsphere of the styrene-modified acrylic resin is at least one selected from methyl acrylate, butyl acrylate, ethyl acrylate, isobutyl acrylate, isooctyl acrylate, cyclohexyl acrylate, methacrylic acid, methyl methacrylate and ethyl methacrylate.
Preferably, the conductive microspheres of the styrene modified acrylic resin use hydrophobic modified conductive carbon black as a conductive agent, and the addition amount of the conductive carbon black is 3-10%; in the conductive microspheres of the styrene modified acrylic resin, a chain transfer agent n-dodecyl mercaptan accounts for 1-7 wt% of a monomer, an oil phase initiator tert-butyl peroxypivalate accounts for 0.5-5 wt% of the monomer, and a crosslinking agent divinylbenzene accounts for 5-15 wt% of the monomer.
A polyurethane water-based antistatic coating comprises the following components in parts by weight: 50-70 wt% of polyurethane resin emulsion, 5-25 wt% of deionized water, 0.1-2 wt% of water-based paint additive, 0.5-5% of ionic liquid, 3-10% of conductive microspheres, 3-10% of water-based nano diamond dispersion liquid, 1-8% of polytetrafluoroethylene dispersion liquid, 1-3% of graphite and 3-15% of film-forming additive.
Preferably, the paint also comprises a silane coupling agent; the using amount of the silane coupling agent is 0.5-5 wt%.
Preferably, the adhesive also comprises a curing agent; the curing agent comprises at least one of isocyanate, aziridine and polycarbodiimide; the usage amount of the curing agent is 2-10 wt% of the resin.
Preferably, the aqueous nano-diamond dispersion liquid contains deionized water, a dispersing agent and hydrophilic nano-diamond powder, and the solid content is 10-25 wt%.
Compared with the prior art, the invention has the beneficial effects that: the invention provides a polyurethane aqueous antistatic coating and a preparation method of a developing roller thereof, which can enable toner to have higher charge amount and high draft concentration, enable the toner to be easily separated, and prevent a photosensitive drum and a scraper from being polluted to generate longitudinal ribs due to carbon powder melting in long-term high-speed printing.
Drawings
FIG. 1 is a schematic view of the structure of a developing roller of the present invention;
in the figure: 1. a metal shaft core; 2. an elastic layer; 3. a surface layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, a method for manufacturing a developing roller includes the following steps: covering the outer layer of the metal shaft core 1 with an elastic layer 2; the surface layer 3 is covered on the outer layer of the elastic layer 2. The elastic layer 2 is a composite system of butadiene rubber and nitrile rubber; the cis-butadiene rubber accounts for 50-90 wt% of the total mass of the rubber, and the volume resistance is controlled to be 103-108Omega cm. The surface layer 3 is a polyurethane water-based antistatic coating of conductive microspheres. The conductive microspheres are conductive microspheres of styrene modified acrylic resin; the conductive microspheres of the styrene modified acrylic resin are prepared by a suspension polymerization process; modification of styreneThe Tg of the conductive microspheres of the acrylic resin is controlled to be 100-130 ℃. The monomer of the conductive microsphere of the styrene modified acrylic resin is at least one selected from methyl acrylate, butyl acrylate, ethyl acrylate, isobutyl acrylate, isooctyl acrylate, cyclohexyl acrylate, methacrylic acid, methyl methacrylate and ethyl methacrylate. The conductive microspheres of the styrene modified acrylic resin use hydrophobic modified conductive carbon black as a conductive agent, and the addition amount of the conductive carbon black is 3-10 wt%; in the conductive microspheres of the styrene modified acrylic resin, a chain transfer agent n-dodecyl mercaptan accounts for 1-7 wt% of a monomer, an oil phase initiator tert-butyl peroxypivalate accounts for 0.5-5 wt% of the monomer, and a crosslinking agent divinylbenzene accounts for 5-15 wt% of the monomer.
In the present embodiment, the material of the metal shaft core 1 is not particularly limited, and a metal material such as stainless steel, aluminum, iron, nickel, or an aluminum alloy may be used, or may be made of a conductive resin.
As the rubber in the elastomer 2, nitrile rubber and cis-butadiene rubber are mainly used. Wherein the content of the butadiene rubber is controlled to be 50-90 wt% of the total rubber in the elastic layer 2, and the content of the nitrile rubber is controlled to be 10-50 wt%.
With respect to the butadiene rubber, if the content is less than 50% by weight, the elasticity of the developing roller elastic layer 2 will be deteriorated, and if it is more than 90% by weight, the electric resistance of the entire rubber system of the conductive elastomer 2 will be increased, and the processability will be deteriorated.
If the content of the nitrile rubber is less than 10% by weight, the resistance of the formulated system of the elastic layer 2 cannot be sufficiently ensured, and if it is more than 50% by weight, the kneading property of the rubber of the elastic layer 2, the grindability of the entire developing roller and the dimensional accuracy are deteriorated. As the nitrile rubber, a nitrile rubber having an acrylonitrile content of 43% or more and a high acrylonitrile content, a nitrile rubber having a high acrylonitrile content having an acrylonitrile content of 36 to 43%, a nitrile rubber having a medium acrylonitrile content having an acrylonitrile content of 25 to 35% or a nitrile rubber having a low acrylonitrile content having an acrylonitrile content of 24% or less can be used.
However, in view of environmental stability, nitrile rubbers having an acrylonitrile content of 25 to 35% are preferred. For the butadiene rubber, any type of butadiene rubber on the market can be used, and non-oil-extended butadiene rubber can be used, such as BR9000, BR9002, BR9003, BR9004, BR9100 and the like; oil-extended polybutadiene rubbers such as BR9175, BR9075, BR9073, and the like may also be used. However, non-oil extended polybutadiene rubber is preferred in view of contamination of the OPC.
In order to ensure good elasticity and compression set thereof, the hardness of the elastomer 2 is limited, its ASKERA being controlled between 45 and 80 °, preferably between 50 and 65 °. If the hardness of the elastic layer 2 is less than 45 °, a small molecule plasticizer needs to be added to cause a significant increase in compression set, an indentation is generated in long-term printing, and the precipitation of small molecule substances contaminates the photosensitive drum and toner. If the hardness of the elastic layer 2 is higher than 80 °, the entire hardness of the developing roller increases, and the nip width cannot be controlled well, which may cause defects such as toner aggregation and low-molecular substance precipitation.
The ionic conduction system of the conductive agent in the prior developing roller elastomer, such as an antistatic agent, has the problems of poor environmental stability, large compression permanent deformation of the developing roller and pollution of the photosensitive drum due to precipitation when the addition amount is large. Therefore, the conductive agent in the developing roller elastic body 2 of the present invention is selected from an electron conductive system, and carbon black, graphite, iron oxide, alumina, antimony oxide, and the like can be used without particular requirement for the conductive agent, but carbon black is recommended in view of cost and source, and specifically, conductive carbon black such as ketjen black, acetylene black, and the like can be used, and carbon black for rubber such as SAF, ISAF, HAF, FEF, GPF, SRF, FT, MT, and the like can also be used. The usage amount is controlled to be 20-50% of the rubber in parts by weight. If it is less than 20% wt, the electric resistance of the elastic layer 2 cannot be well controlled, and if it is more than 50% wt, the electric resistance of the elastic layer 2 is not greatly affected and the hardness is seriously increased. The volume resistance of the elastic layer 2 is controlled to 103-1011Ω.cm。
The aqueous antistatic polyurethane coating containing conductive microspheres must satisfy the condition that the surface resistance of the surface layer 3 should be controlled at 105-1011Omega, the conductive microspheres of styrene modified acrylic resin are prepared by a suspension polymerization process. Constituent styrene modificationThe monomer of the conductive microspheres of the acrylic resin is at least one of styrene-acrylate resin styrene structural monomers selected from styrene, methyl styrene, alpha-methyl styrene and other aromatic vinyl monomers, the acrylate structural monomer is at least one of methyl acrylate, butyl acrylate, ethyl acrylate, isobutyl acrylate, isooctyl acrylate, cyclohexyl acrylate, methacrylic acid, methyl methacrylate and ethyl methacrylate, the conductive agent is conductive carbon black, the type is not limited, and the addition amount is 3-10%. The chain transfer agent n-dodecyl mercaptan accounts for 1-7 wt% of the monomer, the oil phase initiator tert-butyl peroxypivalate accounts for 0.5-5 wt% of the monomer, and the crosslinking agent divinylbenzene accounts for 5-15 wt% of the monomer. The conductive carbon black used for the conductive microspheres of styrene-modified acrylic resin is used as a conductive agent, wherein the conductive carbon black must be subjected to hydrophobic treatment before use, and is subjected to surface treatment using a silane coupling agent such as KH 570. The aqueous nano-diamond dispersion liquid contains deionized water, a dispersant, hydrophilic nano-diamond powder and 15-40 wt% of solid content.
The preparation method of the conductive microspheres of the styrene modified acrylic resin comprises the following steps:
1. hydrophobic modification of conductive carbon black:
adding a coupling agent into the mixed solution of ethanol/water, dispersing for 5-10 Min, adding a pigment, dispersing at a high speed for 3-6 h at a certain temperature, drying, and grinding to a particle size of 0.05-1 um. Wherein KH570 is used as the silane coupling agent, the mass of the silane coupling agent is 0.5-5 wt% of carbon black, and the carbon black is VXC-72 of cabot.
2. Preparation of a monomeric oil phase
Weighing monomers according to the using amount, adding a crosslinking agent divinylbenzene, a chain transfer agent n-dodecyl mercaptan and hydrophobic modified conductive carbon black VXC-72 into a reaction kettle connected with a sand mill while stirring, pre-dispersing for 30-60 min at room temperature, transferring the components into the sand mill through a diaphragm pump, and grinding to prepare an oil phase.
3. Preparation of aqueous dispersion magnesium hydroxide colloid
1) Preparation of magnesium chloride solution: weighing deionized water according to the experimental amount, adding magnesium chloride while stirring, wherein the magnesium chloride accounts for 5-20 wt%, and dispersing for 15-30 Min.
2) Preparation of sodium hydroxide solution: weighing deionized water according to the experimental amount, adding magnesium chloride while stirring, wherein the magnesium chloride accounts for 1-10 wt%, and dispersing for 15-30 Min.
3) Slowly dripping a magnesium chloride solution into a sodium hydroxide solution by using a peristaltic pump, shearing by using U1tratalaxT50 (manufactured by IKA company) at a high speed of 15-45 Min, stopping high-speed shearing, and stirring by using a medium-speed stirrer for 12-24 h to prepare a magnesium hydroxide colloid with the colloid particle size of less than 1 um.
4. The suspension method for preparing the conductive microspheres of the styrene modified acrylic resin comprises the following steps:
1. and (3) granulation: dispersing the prepared oil phase liquid into an aqueous phase dispersion liquid, and performing high-speed shearing granulation by using T50 to form oil drops containing a monomer, a cross-linking agent, a chain transfer agent and an initiator, wherein the particle size of the oil drops is about 4-15 um, the proportion of the oil phase to the aqueous phase is controlled to be 1: 2-1: 10, and 1: 4-1: 8 is further preferable in order to ensure the stability of a system and avoid generating a large amount of small particles.
2. Polymerization: transferring the oil drop-to-dispersion liquid after suspension granulation into a polymerization reaction container, keeping stirring at a medium speed of 200-500 rpm to enable the dispersion liquid to be in suspension dispersion, heating to 85 ℃ under the protection of nitrogen atmosphere to carry out a first polymerization reaction, continuing the reaction for 6-15 h, closing a heating device after the reaction is finished, and continuing stirring and cooling.
3. And (3) filtering: adding acid into the mixed liquid until the pH value is 6-7, and performing suction filtration by using a vacuum-pumping filter pump to keep the microsphere powder on the mixed liquid;
4. cleaning: washing the microsphere powder by deionized water, and performing suction filtration;
5. and (3) drying: and drying for 4-6 h at 75 ℃ by using a blast oven.
Secondly, preparing the antistatic coating:
1) weighing the water-based polyurethane resin emulsion according to the using amount, and adding the water-based paint auxiliary agent while stirring;
2) adding conductive microsphere powder and graphite while stirring, and dispersing at high speed for 15-30 min;
3) adjusting the rotating speed to medium speed, adding the ionic liquid while stirring, and dispersing for 5-10 min;
4) adding the aqueous nano-diamond dispersion liquid while stirring, and dispersing for 5-10 min;
5) adding the polytetrafluoroethylene dispersion liquid while stirring, and dispersing for 5-10 min;
6) adding a film forming aid while stirring, and dispersing for 5-10 min;
7) adding deionized water while stirring, stirring at a high speed, and dispersing for 15-30 min;
8) dropwise adding an adhesion promoter while stirring, and dispersing for 5-10 min;
9) and (3) dropwise adding a curing agent while stirring, and dispersing for 5-10 min.
10) Discharging and filtering.
Thirdly, the specific preparation method of the developing roller comprises the following steps:
the elastic layer 2 is prepared by using an internal rubber mixer or an open rubber mixer, masticating nitrile rubber and butadiene rubber, then adding fillers such as zinc oxide, stearic acid, calcium carbonate, carbon black, sulfur and the like into a rubber mixer, adding the fillers into the rubber compound, and uniformly dispersing the fillers to obtain conductive rubber compound I;
the rubber composition I was extruded by a standard single-screw extruder, and a metal mandrel 1 was placed in the middle of the extrusion to form a developing roller having the structure shown in FIG. one.
The pre-forming rubber roller is placed in a blast oven, heated for 10-30min at the temperature of 100-130 ℃ for pre-vulcanization, and then the temperature of the blast oven is set at the temperature of 150-180 ℃ for vulcanization for 10-20min for real forming.
And (4) grinding the outer layer of the rubber roller by using a grinding wheel, and controlling the size.
Cleaning the surface of the rubber roller, drying the water on the surface, forming the surface layer 3 by a spraying or dip-coating mode, and carrying out curing and drying treatment on the surface by a blast oven.
The present invention will be described in more detail with reference to examples.
Example 1:
20 parts of nitrile rubber and 80 parts of butadiene rubber; 5 parts of zinc oxide, 1 part of stearic acid, 20 parts of calcium carbonate, 30 parts of carbon black and 1.5 parts of sulfur, and the components are uniformly mixed on an open rubber mixing mill or an internal rubber mixing mill to obtain the conductive rubber composition I.
The rubber composition I was extruded by a standard single-screw extruder, and a metal mandrel 1 was placed in the middle of the extrusion to form a developing roller having the structure shown in FIG. one.
Then the pre-forming rubber roller is placed in a blast oven, heated for 10-30min under the condition of 100-130 ℃ for pre-vulcanization, and then the temperature of the blast oven is set at 150-180 ℃ for vulcanization for 10-20min so as to be really formed.
And finally, grinding the outer layer of the rubber roller by using a grinding wheel, and controlling the size.
Cleaning the surface of the rubber roller, drying the water on the surface, forming a surface layer 3 in a spraying or dip-coating mode, using the conductive microspheres I on the surface layer 3, and then using a blast oven to carry out surface curing treatment.
Example 2:
in this example, the same as example 1 was applied except that the conductive microspheres II used for the surface layer of the blanket roll were different from example 1.
Example 3 and example 4
Examples 3 and 4 the conductive microspheres of the surface layer of the glue roller were the same as those of example 1 except that the conductive microspheres of the surface layer of the glue roller were different from those of example 1, wherein example 3 used conductive microspheres III as the resin of the surface layer, and example 4 used conductive microspheres IV as the surface layer 3.
Comparative example 1:
in this example, the same as example 1 was applied except that the conductive microspheres V were used for the surface layer 3 of the blanket roll, which was different from example 1.
Comparative example 2:
in this example, the same as example 1 was applied except that conductive microspheres VI were used for the surface layer 3 of the blanket roll, which is different from example 1.
Comparative example 3
Comparative examples 3 and 4 the same as example 1 except that the kind of conductive microspheres of surface layer 3 was different from that of example 1, wherein comparative example 3 used conductive microspheres VII as the resin of the surface layer and comparative example 4 used conductive microspheres VIII as the surface layer 3.
Comparative example 4
Comparative example 4 is the same as example 1 except that the antistatic coating material for the surface layer is different from example 1, wherein 20% by weight of conductive microspheres i are added to the antistatic coating material for the surface layer 3 of comparative example 4.
Comparative example 5
Comparative example 5 is the same as example 1 except that the antistatic coating of the surface layer 3 is different from example 1, in which microspheres viii are added to the antistatic coating of the surface layer 3 of comparative example 5.
The results of the above experiments are shown in tables 1 and 2.
TABLE 1
TABLE 2
Comparative example 1: as the monomer of the conductive microsphere only uses styrene monomer, the Tg of the conductive microsphere is higher than the specified value, the conductive microsphere is too hard, carbon powder is agglomerated on a scraper due to severe friction in the printing process, longitudinal ribs appear on a printed picture manuscript, and the situation is more serious under the condition of 10 ℃ and 20% humidity.
Comparative example 2: as the usage amount of the monomer butyl acrylate monomer of the conductive microsphere is increased, the Tg of the conductive microsphere is lower than a specified value, and the microsphere becomes soft and molten in the process of curing after the surface layer is sprayed, the appearance and the function of the microsphere are lost. The toner charge amount is low during printing, and the color of the drawn picture is lighter and lighter along with the printing.
Comparative example 3: compared with the embodiment 1, the crosslinking agent and the chain transfer agent are increased in the conductive microsphere synthesis process and exceed the upper limit range specified by us, so that the crosslinking density of the conductive microsphere is too high, the conductive microsphere is too hard, carbon powder is agglomerated on a scraper due to severe friction in the printing process, longitudinal ribs appear on a printed picture, and the situation is more serious under the condition of 10 ℃ and 20% humidity.
Comparative example 4: compared with the embodiment 1, the addition amount of the conductive microspheres is increased from 10% to 20%, and the friction is severe because the addition amount of the microspheres exceeds the specified range, so that the charge amount of the carbon powder is too high, the sublimation high concentration is too low in the printing process, the color of the drawn manuscript is lighter as the printing is carried out, and the situation is more serious under the humidity condition of 10 ℃ 20%.
Comparative example 5: compared with the embodiment 1, the conductive microspheres are replaced by nonconductive microspheres VIII, and the microspheres are nonconductive, so that the surface of the rubber roller is locally insulated, and irregular white spots can appear on the picture.
The surface resistance test method comprises the following steps:
the antistatic coating is sprayed or dip-coated on an insulating substrate (the substrate requires that the length of a square cut is 100mm), and heated by using an air-blast drying oven to be crosslinked and cured. The surface resistance of the antistatic coating was tested using a high resistance tester at 25 ℃ 55%. The results are shown in Table 2.
Testing the charge amount of the toner:
the charging amount of the toner was measured using a TREK MODEL212HS Q/M METER tester at 25 ℃ 55%.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A method for manufacturing a developing roller is characterized in that:
the method comprises the following steps:
covering an elastic layer on the outer layer of the metal shaft core;
the outer layer of the elastic layer is covered with the surface layer.
2. The developing roller production method according to claim 1, characterized in that:
the elastic layer is a composite system of butadiene rubber and nitrile rubber;
the cis-butadiene rubber accounts for 50-90% of the total mass of the rubber, and the volume resistance is controlled to be 103-108Ω.cm。
3. The developing roller production method according to claim 1, characterized in that:
the surface layer is a polyurethane water-based antistatic coating of conductive microspheres.
4. The developing roller production method according to claim 3, characterized in that: the conductive microspheres are conductive microspheres of styrene modified acrylic resin;
the conductive microspheres of the styrene modified acrylic resin are prepared by a suspension polymerization process;
the Tg of the conductive microspheres of the styrene modified acrylic resin is controlled to be 100-130 ℃.
5. The developing roller production method according to claim 4, characterized in that:
the monomer of the conductive microsphere of the styrene modified acrylic resin is at least one selected from methyl acrylate, butyl acrylate, ethyl acrylate, isobutyl acrylate, isooctyl acrylate, cyclohexyl acrylate, methacrylic acid, methyl methacrylate and ethyl methacrylate.
6. The developing roller production method according to claim 4, characterized in that:
the conductive microspheres of the styrene modified acrylic resin use hydrophobic modified conductive carbon black as a conductive agent, and the addition amount of the conductive carbon black is 3-10%;
in the conductive microspheres of the styrene modified acrylic resin, a chain transfer agent n-dodecyl mercaptan accounts for 1-7 wt% of a monomer, an oil phase initiator tert-butyl peroxypivalate accounts for 0.5-5 wt% of the monomer, and a crosslinking agent divinylbenzene accounts for 5-15 wt% of the monomer.
7. The polyurethane aqueous antistatic coating of claim 3 wherein:
comprises the following components in parts by weight:
50-70 wt% of polyurethane resin emulsion, 5-25 wt% of deionized water, 0.1-2 wt% of water-based paint additive, 0.5-5 wt% of ionic liquid, 3-10 wt% of conductive microspheres, 3-10 wt% of water-based nano diamond dispersion liquid, 1-8 wt% of polytetrafluoroethylene dispersion liquid, 1-3 wt% of graphite and 3-15 wt% of film-forming additive.
8. The polyurethane aqueous antistatic coating of claim 7 wherein:
also includes a silane coupling agent;
the using amount of the silane coupling agent is 0.5-5 wt%.
9. The polyurethane aqueous antistatic coating of claim 7 wherein:
also comprises a curing agent;
the curing agent comprises at least one of isocyanate, aziridine and polycarbodiimide;
the usage amount of the curing agent is 2-10 wt% of the resin.
10. The polyurethane aqueous antistatic coating of claim 7 wherein:
the aqueous nano-diamond dispersion liquid contains deionized water, a dispersing agent and hydrophilic nano-diamond powder, and the solid content is 10-25 wt%.
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