Low-density carrier core material for electrostatic image developer and preparation method thereof and carrier and application thereof

A technology for electrostatic image development and carrier core material, which is applied in the directions of developer, electrography, optics, etc., can solve the problems of unsatisfactory dispersion state, uneven gap, low temperature, etc., achieves difficult to develop spots and simple process method. , the effect of uniform internal voids

Active Publication Date: 2012-07-25
HUBEI DINGLONG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The carriers obtained by these two preparation methods have insufficient performance. The carrier core material prepared by the magnetic body-resin composite system method has a resin component inside, resulting in low carrier strength and low saturation magnetization. Correspondingly low, and because of the difference in the density of the metal oxide and the resin, the overall density distribution of the carrier is uneven, and developing spots may appear during use, and it is also difficult to obtain a carrier core material with a narrow particle size distribution range by this method Particles; and the method of adding resin particles to the metal oxide raw material to form a hollow structure after sintering, because the resin and metal oxide are simply physically mixed, the hollow structure caused by the gas generated by the combustion of the resin is not uniform, and due to The gasification temperature of the resin is relatively low, and a large amount of gas has been released in the early stage of the calcination stage, which is not conducive to the formation of a sufficient hollow structure
Moreover, the dispersion state of the resin in the metal oxide is not very ideal, resulting in uneven voids formed inside the carrier, which affects the uniformity of the carrier core material structure and easily forms development spots

Method used

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  • Low-density carrier core material for electrostatic image developer and preparation method thereof and carrier and application thereof
  • Low-density carrier core material for electrostatic image developer and preparation method thereof and carrier and application thereof
  • Low-density carrier core material for electrostatic image developer and preparation method thereof and carrier and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0019]

[0020] 2600g ferric citrate, 218g Mn 3 o 4 , 24g MgO, 13g SrO as the raw material of the carrier core material, dispersed in 3000g water, at the same time add 10g polyacrylic acid as a dispersant, add 30g polyvinyl alcohol as a binder, use a wet ball mill to wet pulverize the slurry to the volume average The particle size is below 1um, and the mixed slurry of the above substances is obtained. Use a spray dryer to spray the slurry into hot air at 250°C to dry it. The air pressure is 0.15MPa to obtain dry particles with a particle size of 10-100um. Sieve and classify the coarse and fine particles to adjust the particle size. The granulated powder The particle size is adjusted to 20-60um.

[0021]

[0022] The mixed granulated powder of metal raw materials is put into an electric furnace, heated to 800-1000°C, and calcined in the atmosphere for 2 hours to become a calcined product. At this time, a hollow porous structure is formed in the granulated powder due to t...

Embodiment 2

[0026] Except that the amount of ferric citrate was changed to 1530 g, other conditions were the same as in Example 1 to obtain the carrier core material of Example 2.

Embodiment 3

[0028] Except that the amount of ferric citrate was changed to 3690 g, other conditions were the same as in Example 1 to obtain the carrier core material of Example 3.

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PUM

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Abstract

The invention relates to a low-density carrier core material for an electrostatic image developer and a preparation method thereof and a carrier and application thereof. Through the invention, the problems of low strength, high density, high energy consumption, low charged stability, complicated preparation technology and easy formation of development spots of the existing carrier core material for an electrostatic image developer are solved. The carrier core material provided by the invention is prepared from the mixture of a metal complex and a metal oxide by crushing, granulating, calcining and sintering, wherein the molar content of the metal complex is 70-80%; the metal complex at least comprises one metal element of iron, manganese and strontium; and the metal oxide at least comprises one metal element of iron, magnesium, manganese and strontium. The prepared carrier core material has the advantages of low density, good carrier durability, stable charged performance, long service life and good development effect.

Description

technical field [0001] The invention relates to an electrostatic image developer, in particular to a low-density carrier core material for an electrostatic image developer, a preparation method thereof, a carrier and an application thereof. Background technique [0002] Electrostatic image development technology is widely used in various fields, in which an image is obtained by forming an electrostatic latent image on a photoreceptor through charging and exposure processes, and developing the latent image with a toner containing a colorant , and then transferred to the transfer element, and fixed by heating to achieve the purpose of visualizing image information. Electrostatic image developers include two-component developers containing toner and carrier and one-component developers containing only toner. As a carrier of a two-component developer, a carrier comprising a carrier core material and a resin layer coated on the surface of the carrier core material is widely used...

Claims

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Application Information

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IPC IPC(8): G03G9/10G03G9/107
Inventor 朱顺全刘敏喻家赓兰泽冠
Owner HUBEI DINGLONG CO LTD
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