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Carbon powder used in digital duplicating machine and preparation method thereof

A technology for copiers and toners, applied in the field of toner preparation, can solve the problems of reduced blackness of documents copied by toners, unclear documents and images, easy sticking to rollers, etc., and achieves no pollution on document images and good fixing firmness. , the effect of high charge

Inactive Publication Date: 2007-08-01
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] An object of the present invention is to provide magnetic powder with high saturation magnetization and polymer resin as the main raw materials, which is good fluidity, high charge, clear copy manuscript, high blackness, no bottom dust, and non-stick carbon for digital copiers. To overcome the mismatch of target toner prepared by commercially available magnetic powder and resin, the blackness of the toner copy document is easy to decrease, it is seriously affected by temperature and humidity, it is easy to stick to the roller, and the document and image are not clear

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Ferric oxide magnetic powder with high saturation magnetization of 85.5emu / g is prepared by the following method:

[0050] (1) Add the mixed solution of sodium hydroxide, ammonium bicarbonate and ammoniacal liquor into the ferrous sulfate solution, stir evenly, and adjust the pH value in the range of 12 to 14;

[0051] Wherein the concentration of ferrous sulfate solution is 0.8mol / L; The concentration of sodium hydroxide solution is 22%; The concentration of ammonium bicarbonate solution is 26%; The concentration of ammoniacal liquor is 31%; Sodium hydroxide: ammonium bicarbonate: the mass ratio of ammoniacal liquor is 1: 1: 1, the mixed solution of ferrous sulfate and sodium hydroxide, ammonium bicarbonate and ammoniacal liquor is mixed in the ratio of 1: 25 (mass ratio);

[0052] (2) Nitrogen is passed into the mixed solution of step (1), the temperature is raised to 65° C., and the temperature is kept for 20 minutes;

[0053] (3) After heat preservation, the temperat...

Embodiment 2

[0072] Ferric oxide magnetic powder with high saturation magnetization of 87.2emu / g is prepared by the following method:

[0073] (1) Add the mixed solution of sodium hydroxide, ammonium bicarbonate and ammoniacal liquor into the ferrous sulfate solution, stir evenly, and adjust the pH value in the range of 12 to 14;

[0074] Wherein the concentration of ferrous sulfate solution is 0.6mol / L; The concentration of sodium hydroxide solution is 25%; The concentration of ammonium bicarbonate solution is 30%; The concentration of ammoniacal liquor is 35%; Sodium hydroxide: ammonium bicarbonate: the mass ratio of ammoniacal liquor is 1.5: 1.2: 2, the mixed solution of ferrous sulfate and sodium hydroxide, ammonium bicarbonate and ammoniacal liquor is mixed in the ratio of 1: 50 (mass ratio);

[0075] (2) Nitrogen is passed into the mixed solution of step (1), the temperature is raised to 85° C., and the temperature is kept for 30 minutes;

[0076] (3) After the heat preservation, th...

Embodiment 3

[0095] Ferric oxide magnetic powder with high saturation magnetization of 91.2emu / g is prepared by the following method:

[0096] (1) Add the mixed solution of sodium hydroxide, ammonium bicarbonate and ammoniacal liquor into the ferrous sulfate solution, stir evenly, and adjust the pH value in the range of 12 to 14;

[0097] Wherein the concentration of ferrous sulfate solution is 1.0mol / L; The concentration of sodium hydroxide solution is 28%; The concentration of ammonium bicarbonate solution is 33%; The concentration of ammoniacal liquor is 30%; The ratio of sodium hydroxide: ammonium bicarbonate: ammoniacal liquor is 3 : 1.5: 2, the mixed solution of ferrous sulfate and sodium hydroxide, ammonium bicarbonate and ammoniacal liquor mixes with the ratio of 1: 75 (mass ratio);

[0098] (2) Nitrogen is passed into the mixed solution of step (1), the temperature is raised to 90° C., and the temperature is kept for 30 minutes;

[0099] (3) After heat preservation, the temperatu...

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PUM

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Abstract

This invention relates to digital copier carbon powder, which comprises the following components: ferriferrous oxide magnetic powder for 30 to 40 percent of magnetic saturation intensity more than 85emu / g; 40 to 50 percent of macromolecule resin; 1 to 10 percent of carbon black; 1 to 5 percent of hexamethyldisilazane for mixing, wherein, they go through mixture melting, shaping, rough grinding, gas flow grinding, filtering to get the rough product with particle diameter for 7 to 8 mum; then adding zinc stearate for 3 to 5 percent and earth silicon sparse agent for surface modification to make the product flow property more than 20 percent then for filtering.

Description

technical field [0001] The invention belongs to the field of carbon powder for digital copiers, in particular to a carbon powder for digital copiers prepared by using ferric oxide magnetic powder with high saturation magnetization and polymer resin as main raw materials, and a preparation method of the carbon powder. Background technique [0002] The quality of toner for copiers depends on the main raw materials, magnetic powder and resin. At present, manufacturers of toner usually purchase resin, magnetic powder and other main raw materials from the market. There are factors such as the mismatch between the raw material and the target toner performance, which leads to the decline in the performance of the toner. The document image is not clear, the blackness is low, and there is bottom dust, which is seriously affected by temperature and humidity, and it is easy to stick to the roller and other problems. [0003] For example, "a developer and its preparation method" applied...

Claims

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Application Information

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IPC IPC(8): G03G9/08G03G9/083
Inventor 宋宝珍周学良甘耀焜唐清李巧霞
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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