Method for producing suspension polymerization toner with densely charged core-shell structure

A technology of suspension polymerization and core-shell structure, which is applied in the field of toner manufacturing, can solve the problem of difficult toner particles, and achieve the effect of regular shape

Active Publication Date: 2015-04-22
SHENZHEN LEPUTAI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is not easy to obtain spherical toner particles.

Method used

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  • Method for producing suspension polymerization toner with densely charged core-shell structure
  • Method for producing suspension polymerization toner with densely charged core-shell structure
  • Method for producing suspension polymerization toner with densely charged core-shell structure

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Effect test

preparation example Construction

[0023] See figure 1 The preparation method of the suspension polymerization toner with densely charged core-shell structure provided by the present invention includes the following steps:

[0024] (1) Separately preparing a low-Tg monomer oil phase constituting the toner core particles and an aqueous dispersion for dispersing the low-Tg monomer oil phase;

[0025] (2) The above-mentioned monomer oil phase and the aqueous dispersion are blended at a certain oil-water ratio, and after high-speed shear suspension granulation, they are transferred to the reactor, and then the monomer oil phase is subjected to the first polymerization reaction (heating polymerization reaction). The body oil droplet particles are completely converted into polymer particles to obtain soft toner core particles;

[0026] (3) The high Tg shell monomer constituting the rigid shell layer is added to water containing a certain amount of surfactant, and after high-speed shearing or ultrasound is used to form a min...

Embodiment 1

[0071] 81 parts of styrene, 19 parts of n-butyl acrylate, 0.3 parts of divinylbenzene, 1.0 part of n-dodecanethiol, 7 parts of carbon black (NP60, manufactured by Degussa), ester wax (WE-5 , Manufactured by Nippon Oil & Fat Co., Ltd.) 8 parts, the above components were dispersed in a bead mill at room temperature to prepare a monomer oil phase. Further add 6 parts of oil-soluble initiator 2-ethyl tert-butyl peroxyacetate and fully disperse for 30 minutes.

[0072] In addition, an aqueous solution of 100 parts of deionized water dissolved in 13 parts of magnesium chloride was slowly added to an aqueous solution of 200 parts of deionized water dissolved in 8.3 parts of sodium hydroxide, high-speed shear dispersion for 1 hour, and ultrasonic aging at room temperature for 4 hours to obtain magnesium hydroxide Suspension dispersion, in which the remaining electrolyte magnesium chloride concentration is 1wt% of water.

[0073] The prepared monomer oil phase was added to the magnesium hy...

Embodiment 2

[0077] In addition to 10 parts of styrene, 0.3 parts of 1,4-butanediol dimethacrylate, and 20 parts of positive CCAFCA-201-PS (50nm, solid content 10wt%) dispersion were changed to methyl methacrylate 5 Part, 0.2 part of divinylbenzene, 5 parts of positively charged CCA FCA-207P (80nm, solid content 20wt%) dispersion liquid, the same operation as in Example 1 was performed to obtain the suspension polymerization of the present invention with an average particle size of 8.2μm Toner. The evaluation results of the obtained toner characteristics are shown in Table 1.

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Abstract

Suspension polymerization toner of a core-shell structure with dense charges comprises core-shell composite particles prepared by mixing suspension dispersion liquid of toner core particles with shell monomer emulsion and resin-type CCA dispersion liquid, and carrying out a polymerization reaction to form rigid shell layers with dense charges coated on the soft toner core particles. A preparation method thereof comprises: mixing a low-Tg monomer oil phase forming toner core particles with aqueous dispersion liquid, carrying out a heating polymerization reaction after suspension granulation to convert monomer oil droplet particles to polymer particles, and obtaining soft toner core particles; adding a high-Tg shell monomer forming rigid shell layers into water containing a surfactant to form emulsion, adding the emulsion and CCA dispersion liquid into suspension dispersion liquid of the soft toner core particles for secondary polymerization after mixing, and cleaning, filtering, drying and performing additive treatment. As a resin-type CCA has good compatibility with toner shell resin, and does not fall off a surface of the toner easily, the toner has an high electrified amount and good environmental stability, and is excellent in imaging property, low-temperature fixation property and transfer printing property.

Description

【Technical Field】 [0001] The invention relates to the field of toner manufacturing, in particular to a method for preparing suspension polymerized toner with densely charged core-shell structure for electrostatic charge image development by a suspension polymerization process. 【Background technique】 [0002] Toner is a developer material used in laser printers or copies. The printer operation process is roughly as follows: the uniformly charged photosensitive drum surface is exposed to form an electrostatic latent image; the toner charged by the developing roller and the doctor blade develops the electrostatic latent image on the photosensitive drum surface to form an image; attracted by the opposite charge on the paper surface, the photosensitive The image on the drum surface is transferred to the paper, and then fixed by the heating roller and the pressure roller to obtain the printed image we need. [0003] It can be seen from the above printing process that the developing roll...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G9/08G03G9/12
CPCG03G9/093G03G9/09321G03G9/0806G03G9/0819G03G9/0827G03G9/09328G03G9/09371G03G9/09392
Inventor 刘志军张媛媛张欢孟鸿羊辉
Owner SHENZHEN LEPUTAI TECH CO LTD
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