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Magnetic core material for electrophotographic developers, carrier for electrophotographic developers, developer, method for producing magnetic core material for electrophotographic developers, method for producing carrier for electrophotographic developers, and method for producing developer

Electrophotography, technology of manufacturing method, applied to magnetic core material for electrophotographic developer, carrier for electrophotographic developer, developer, manufacture of magnetic core material for electrophotographic developer, manufacture of carrier for electrophotographic developer , and the field of developer manufacturing, which can solve problems such as high specific gravity, occurrence of lines, and non-use

Active Publication Date: 2019-05-03
POWDERTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the true specific gravity of such an iron powder carrier is as high as about 7.8. In addition, the magnetization is too high. Therefore, due to agitation / mixing with the toner particles in the developing cartridge, the toner constituents are easily transferred to the surface of the iron powder carrier. Fusion, so-called toner consumption
Due to such toner consumption, the effective carrier surface area tends to decrease, and the triboelectricity with toner particles decreases.
In addition, in the resin-coated iron powder carrier, the resin on the surface is peeled off due to the mechanical stress such as the stirring stress during the brushing or the collision, impact, friction and stress between the particles in the developing machine. The core material (iron powder) which is conductive and has a low dielectric breakdown voltage is exposed, and charge leakage sometimes occurs
Due to such charge leakage, the electrostatic latent image formed on the photoreceptor is destroyed, and lines and the like occur in the solid part, making it difficult to obtain a uniform image.
For these reasons, iron powder carriers such as oxide-coated iron powder and resin-coated iron powder are less and less used.

Method used

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  • Magnetic core material for electrophotographic developers, carrier for electrophotographic developers, developer, method for producing magnetic core material for electrophotographic developers, method for producing carrier for electrophotographic developers, and method for producing developer
  • Magnetic core material for electrophotographic developers, carrier for electrophotographic developers, developer, method for producing magnetic core material for electrophotographic developers, method for producing carrier for electrophotographic developers, and method for producing developer
  • Magnetic core material for electrophotographic developers, carrier for electrophotographic developers, developer, method for producing magnetic core material for electrophotographic developers, method for producing carrier for electrophotographic developers, and method for producing developer

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0097] (1) Production of magnetic core material

[0098] The production of the magnetic core material was performed as follows. That is, the raw materials were weighed so that the composition ratio after firing was MnO: 20mol%, Fe 2 o 3 : 80 mol%, water was added, pulverized and mixed with a wet ball mill for 5 hours, dried, and then kept at 950° C. for 1 hour to perform calcination. As the raw material of MnO, 2.7 kg of trimanganese tetraoxide was used, and as Fe 2 o 3 Raw material, 22.3kg of Fe was used 2 o 3 .

[0099] (1-1) Grinding of pre-fired products

[0100] Water was added to the calcined product obtained in this way, and it was pulverized by a wet ball mill for 4 hours. After dehydrating the obtained slurry by pressing it with a filter press, water was added to the filter cake, and it was pulverized by a wet ball mill again for 4 hours to obtain Slurry 1.

[0101] (1-2) Granulation

[0102] To the obtained slurry 1, 0.2% by weight of PVA (polyvinyl alcohol)...

example 2

[0155] (1) Production of magnetic core material

[0156] The production of the magnetic core material and the carrier was performed as follows. That is, raw materials were weighed such that the composition ratio after firing was MnO: 40.0 mol%, MgO: 10.0 mol%, Fe 2 o 3 : 50.0mol%, and further, 1.5 parts by weight of ZrO was added to 100 parts by weight of these metal oxides 2 . Fe as raw material 2 o 3 16.9 kg was used, 6.5 kg of trimanganese tetraoxide was used as the raw material of MnO, 1.2 kg of magnesium hydroxide was used as the raw material of MgO, and 1.2 kg of magnesium hydroxide was used as the raw material of ZrO 2 0.4kg of ZrO was used as the raw material 2 .

[0157] (1-1) Grinding of pre-fired products

[0158] These mixtures were pulverized and mixed with a wet ball mill for 5 hours, dried, and then calcined by holding at 950° C. for 1 hour. Water was added to the calcined product obtained in this way, pulverized by a wet ball mill for 4 hours, and the ...

example 3

[0167] (1) Production of magnetic core material

[0168] The production of the magnetic core material and the carrier was performed as follows. That is, raw materials were weighed such that the composition ratio after firing was MnO: 10.0 mol%, Li 2 O: 13.3mol%, Fe 2 o 3 : 76.7 mol%, water was added to make the solid content 50%. Further, adding SiO 2 In terms of a 20% lithium silicate aqueous solution, Si was 10000 ppm with respect to the solid content. Fe as raw material 2 o 3 21.9kg was used, 1.4kg of trimanganese tetraoxide was used as MnO raw material, and as Li 2 O raw material used lithium carbonate 1.8kg.

[0169] (1-1) Grinding of pre-fired products

[0170] These mixtures were pulverized and mixed with a wet ball mill for 5 hours, dried, and then calcined at 1000° C. in the air. Water was added to the calcined product obtained in this way, and it was pulverized in a wet ball mill for 4 hours. After dehydrating the obtained slurry with a centrifugal dehydrat...

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Abstract

Provided are: a magnetic core material for electrophotographic developers, which has excellent start-up in the charge amount and is capable of suppressing carrier scattering, thereby enabling stable achievement of good images; a carrier for electrophotographic developers; a developer which contains the carrier; a method for producing a magnetic core material for electrophotographic developers; a method for producing a carrier for electrophotographic developers; and a method for producing a developer. A magnetic core material for electrophotographic developers, in which the content of a sulfurcomponent is 1-45 ppm in terms of sulfate ions.

Description

technical field [0001] The present invention relates to a magnetic core material for an electrophotographic developer, a carrier for an electrophotographic developer, a developer, a method for producing a magnetic core material for an electrophotographic developer, a method for producing a carrier for an electrophotographic developer, and a method for producing a developer . Background technique [0002] The electrophotographic development method is a method of attaching toner particles in a developer to an electrostatic latent image formed on a photoreceptor to perform development, and the developer used in this method is divided into: a two-component developer; and a one-component developer using only toner particles. [0003] As a developing method using a two-component developer including toner particles and carrier particles among such developers, a cascade method or the like has conventionally been used, but now magnetic rollers using magnetic rollers are used. The b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/107G03G9/113
CPCG03G9/107G03G9/1075G03G9/1131G03G9/0819G03G9/1139
Inventor 泽本裕树植村哲也
Owner POWDERTECH
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