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Preparation method of color toner with core-shell structure

A technology of color toner and core-shell structure, which is used in instruments, developers, optics, etc., can solve the problems of uneven coating of shell resin self-aggregation into granules and shell layer, and the production process of core-shell structure toner is not specifically described. , to avoid carbon black agglomerates, controllable thickness, and uniform coating

Active Publication Date: 2019-01-01
SHENZHEN LEPUTAI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method only involves a kind of emulsion coagulation technology, and does not specifically describe the production process of the core-shell structure toner. The problems such as the self-aggregation and granulation of the shell resin and the uneven coating of the shell layer that are prone to occur in the core-shell structure toner need to be solved in the future. improve

Method used

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  • Preparation method of color toner with core-shell structure
  • Preparation method of color toner with core-shell structure
  • Preparation method of color toner with core-shell structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] 1) Preparation of modified carbon black

[0075] Add 1.0 g of silane coupling agent KH-570 into 100 mL of isopropanol / water mixed solvent (volume ratio 1:1), and ultrasonically disperse at 300 rpm for 0.5 h. Add 10g of carbon black NP60 to the system, and wet it at 200rpm for 1h. Raise the temperature to 80°C while dispersing at a high speed of 2000rpm for 2h. The hydrophobically modified carbon black B can be obtained by drying and grinding the dispersion liquid.

[0076] 2) Preparation of nuclear emulsion A with low Tg of modified carbon black and wax encapsulated

[0077]

[0078]

[0079] The above-mentioned raw materials were added into a 1L four-necked flask, and dispersed at 42° C. and 300 rpm for 0.5 h. Add 8 parts of modified carbon black to the system, ultrasonically disperse for 0.5 h, then add 8 parts of ester wax to fully dissolve, add 7 parts of tert-butyl peroxypivalate to the system to obtain a monomer mixture. Take another 1L beaker, add 2 par...

Embodiment 2

[0087] In embodiment 1, the carbon black NP60 pigment used is replaced by yellow pigment 180 (manufactured by Clariant), and the positively charged charge control agent FCA-201-PS is replaced by the negatively charged charge control agent FCA-1001-NS (Japan Teng Cang Chemical Industry Co., Ltd. Co., Ltd.), 80 parts of 25%wt shell emulsion A was changed to 140 parts, and the remaining operations were consistent with Example 1. The toner (2) with core-shell structure (particle size: 6.5 μm, mass ratio of shell resin to core resin: 35%) can be obtained. Table 1 shows the obtained toner characteristic evaluation results.

Embodiment 3

[0089] The carbon black NP60 pigment used in Example 1 is replaced by cyan pigment 15:3 (manufactured by Clariant), the styrene used to prepare the shell resin emulsion B is changed to 92 parts, and butyl acrylate is changed to 8 parts, that is, the shell resin Tg is by 70°C was changed to 80°C, and the core-shell melting temperature was changed from 75°C to 85°C. 80 parts of 25%wt shell emulsion B was changed to 60 parts, and the rest of the operations were the same as in Example 1. The toner (2) with core-shell structure (particle size: 5.8 μm, mass ratio of shell resin to core resin: 15%) can be obtained. Table 1 shows the obtained toner characteristic evaluation results.

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Abstract

The invention relates to a method for preparing core-shell-structure colored toner. The method comprises the following steps: carrying out hydrophobic modification on pigment; and preparing low-Tg core emulsion packaged with pigment and wax, and high-Tg shell miniemulsion packaged with CCA resin by adopting a miniemulsion method, un-stabilizing the low-Tg nuclear emulsion by adopting an agglutination technology, granulating to obtain a matter, adding high-Tg shell miniemulsion, un-stabilizing the matter on the surface of a core particle so as to form a layer of uniform shell membrane, heating again to enable a core shell to be melted and spherified, and carrying out aftertreatment to obtain the core-shell-structure colored toner. According to the toner, the pigment is modified so as to prevent carbon black aggregates from being generated; the leakage of the pigment and the wax and the problem of electrified stability due to the leakage of the pigment and the wax are prevented by the package of the pigment and the wax; CCA is centrally distributed in toner shell layer resin by adopting an agglutination technology, so that the core-shell-structure colored toner not only has the characteristics of high electrification speed and high charge density, but also has the advantages of narrow particle size distribution, high color density, high coating rate and the like.

Description

【Technical field】 [0001] The invention relates to the field of toner manufacturing for imaging equipment, in particular to a method for preparing color toner with a core-shell structure. 【Background technique】 [0002] With the continuous improvement of the level of office automation, the requirements for printers and copiers for printing and copying text or pictures are getting higher and higher, which prompts a huge market demand for toner as consumables for printers and copiers. While satisfying high image quality and high resolution, the toner is required to have as low a fixing temperature as possible and good storability. In addition, printing stability also poses further requirements. The traditional melting pulverization method can no longer meet the needs of toner performance, and the toner market has turned to chemically synthesized polymer toner; at present, the methods of producing polymer toner mainly include emulsion polymerization and suspension polymerizatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G9/08
Inventor 路雨青刘志军曹方敏李东莹程卫峰李绍昌羊辉
Owner SHENZHEN LEPUTAI TECH CO LTD
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