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Novel double-component developer

A two-component developer and toner technology, which is applied in the direction of developer, electrography, optics, etc., can solve the problem of reduced carrying force of carrier particles, and achieve low environmental dependence, electrical and magnetic properties Good, the effect of solving the problem of carrier dispersion

Inactive Publication Date: 2014-01-15
珠海瑞彩电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the particle size of the carrier is reduced, the holding force of each carrier particle may decrease

Method used

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  • Novel double-component developer

Examples

Experimental program
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Effect test

preparation example Construction

[0029] The preparation method of the carrier core material is specifically:

[0030] The first step is to select iron-containing raw materials and magnesium-containing raw materials, and mix them in an appropriate proportion according to the proportion of the final product. The magnesium-containing raw materials are preferably MgO, and the iron-containing raw materials are optionally selected as Fe 2 o 3 ;

[0031] In the second step, add reducing agent and water to the raw materials mixed in the first step, mix and stir to make slurry, and make slurry raw materials. The reducing agent can be carbon powder or polycarboxylic acid organic matter, polyacrylic acid organic matter , maleic acid, acetic acid, polyvinyl alcohol and mixtures thereof, the solid component concentration accounts for more than 50% of the entire mixed slurry concentration;

[0032] The third step is to granulate the raw materials after the slurrying in the second step by means of spray drying, the spray ...

Embodiment 1

[0059] Example 1 Preparation of toner

[0060] Add 7.5 parts by weight of colorant carbon black, 2.0 parts by weight of polyethylene and 1.0 parts by weight of charge control agent to 100 parts by weight of the adhesive resin polystyrene, fully mix with a high-speed mixer, and melt the obtained mixture with a twin-screw kneader Knead. The resulting kneaded mixture was pulverized by a jet mill and then classified to obtain toner base particles having a volume average particle diameter of 7.0 μm. A toner was obtained by adding 1.2 parts by weight of silica fine particles as an external additive to 100 parts by weight of the toner base particles.

Embodiment 2

[0061] Example 2 Preparation of Carrier Core Material 1

[0062] Disperse 13.7kg Fe in 7.5kg water 2 o 3 (average particle diameter: 1 μm), 6.5 kg of MgO (average particle diameter: 1 μm), 135 g of ammonium polycarboxylate dispersant was added as a dispersant, and 68 g of carbon black was added as a reducing agent to prepare a mixture. When the solid content concentration at this time was measured, it was 75 weight%. The mixture was pulverized by a wet ball mill (medium diameter: 2 mm) to obtain a mixed slurry. The slurry was sprayed in hot air at about 130°C by a spray dryer to obtain dry granulated powder. And, at this time, the granulated powder outside the target particle size distribution was removed by a sieve. The granulated powder was put into an electric furnace and baked at 1130° C. for 3 hours. At this time, the atmosphere was adjusted so that the oxygen concentration in the electric furnace was 0.8% into the electric furnace. The obtained calcined product was...

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Abstract

The invention provides a double-component developer which is characterized by comprising a toner and a resin-coated carrier. A carrier core material is formed by a core shown in a general formula of MgXFe3-XO4, wherein x is less than or equal to 1 and more than or equal to 0. The carrier core material of the double-component developer provided by the invention has excellent electrical characteristics and magnetic characteristics and low environmental dependency and the problem of carrier dispersion can be solved.

Description

technical field [0001] The invention relates to a carrier core material for electrostatic image development and a two-component developer for electrostatic images. Background technique [0002] Electrophotography is a process that involves forming an electrostatic latent image on a photoreceptor, depositing toner on the image to form an imaged pattern, and transferring the toner to an object. Electrophotography includes two main categories: two-component development and one-component development. In two-component development, a developer contains two components of a carrier and a toner, and a magnetic carrier is often used as a carrier. [0003] In copiers, MFPs, etc., as a dry developing method in electrophotography, there are one-component developers that use only toner as a developer component, and two-component developers that use toner and a carrier as a developer component. . In any developing method, toner with a fixed charge is provided to the photoreceptor. Then...

Claims

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Application Information

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IPC IPC(8): G03G9/107G03G9/08
Inventor 刘超
Owner 珠海瑞彩电子科技有限公司
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