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Production method for spherical iron oxide black magnetic powder used for laser printing, and spherical iron oxide black magnetic powder

A spherical, magnetic powder technology, applied in the preparation method of spherical magnetic powder iron oxide black and the field of spherical iron black magnetic powder, can solve the problem of difficult to obtain stable performance, achieve high blackness, low coercive force, and stable performance

Inactive Publication Date: 2009-04-08
南通宝聚颜料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Spherical particles can be obtained by strictly controlling Fe(II) / NaOH at 0.48-0.6 in the precipitation (USP6806010, USP6849196), but the product performance is very sensitive to the pH in the reaction, heating rate, stirring form and speed, and oxidation time. It is difficult to obtain products with stable performance in the industry

Method used

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  • Production method for spherical iron oxide black magnetic powder used for laser printing, and spherical iron oxide black magnetic powder
  • Production method for spherical iron oxide black magnetic powder used for laser printing, and spherical iron oxide black magnetic powder

Examples

Experimental program
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Effect test

Embodiment 1

[0028] In a bucket with a capacity of 30 cubic meters, the ferrous sulfate solution (according to FeSO 4 .7H 2 O counts as 2750 kilograms), adds 650 kilograms of 30% sodium hydroxide solution under stirring at 32 degrees Celsius. Stirring was continued for 5 more minutes after the addition was complete. At this moment, the temperature of the solution is about 35 degrees Celsius. A seed crystal suspension was formed after oxidizing with air for 8 hours. Pump the seed crystal suspension into a 50 cubic meter oxidation barrel filled with iron sheets, dilute with water and oxidize with air at 80 degrees Celsius for 72 hours to obtain iron oxide yellow suspension. This suspension is pumped in the synthetic bucket of 100 cubic meters, adds the ferrous sulfate solution of 35% to make iron yellow: FeSO4.7H 2 O is 1:1.8, and the temperature of the iron yellow suspension is raised to 90-95 degrees Celsius, and slowly add 30% sodium hydroxide solution under stirring to maintain the t...

Embodiment 2

[0037] Different from Example 1 is that in the preparation of iron oxide yellow crystal seed, add 3000 kilograms (with FeSO 4 .7H 2O meter) ferrous sulfate solution and 750 kilograms of 30% sodium hydroxide solution. All the other operations have the following properties with the product that embodiment 1. obtains:

[0038] Fe3O4 content 97.8%

[0039] Hc VSM@10k field 62.29Oe

[0040] Sigma S VSM@10k field 80.02emu / g

[0041] Sigma R VSM@10k field 4.0emu / g

[0042] Spherical particle size 0.20 microns

[0043] The BET specific surface area is 5.9 square meters per gram.

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Abstract

The invention discloses a preparation method of spherical iron black magnetic powder for laser printing and the spherical iron black magnetic powder. Iron salt, basic solution, industrial scrap iron shavings, and scrap iron wires or waste iron sheets are taken as raw materials, two-step oxidation is carried out to generate iron oxide yellow by using the raw materials, and then the iron oxide yellow is added to prepare the spherical iron black magnetic powder. In the method, the magnetic powder is obtained by oxidizing the raw materials twice and then adding the obtained oxide, has comparatively stable performance, narrow particle size distribution and comparatively low coercive force, and is better than the common magnetic powder used in laser printers. The magnetic powder has the advantages of high definition, high blackness and the like.

Description

technical field [0001] The invention relates to a preparation method of spherical magnetic powder iron oxide black and spherical iron black magnetic powder, belonging to the technical fields of copying and laser printing, and in particular to a product obtained by oxidizing raw materials twice and then re-layering. A preparation method of spherical iron oxide black magnetic powder for laser printing with narrow distribution and low coercive force and spherical iron oxide black magnetic powder thereof. Background technique [0002] Black magnetic iron oxide black (Fe 3 o 4 ). At the heart of copiers and laser printers is a cylinder coated with an organic photoconductive coating (OPC). Use a high-voltage corona to charge the cylinder with static charge. Under the laser or projection system, the coating area irradiated by light will lose different proportions of charge, while the unexposed part, that is, the black spot part of the original, will maintain its charge. When th...

Claims

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Application Information

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IPC IPC(8): G03G9/083C01G49/06C01G49/02
Inventor 谭刚屈庆文邵玉祥杨建明
Owner 南通宝聚颜料有限公司
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