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Preparation method of suspension polymerization powdered ink with core-shell structure

A technology of suspension polymerization and core-shell structure, which is applied in the field of toner manufacturing, can solve the problems of reducing the uniform charge on the surface of toner by suspension method, uneven charge on the surface of toner particles, and poor printing effect, etc., and achieve good low-temperature fixability and Environmental stability, improvement of surface charging uniformity, and the effect of good environmental stability

Active Publication Date: 2013-05-15
SHENZHEN LEPUTAI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the influence of particle surface coating efficiency, the system is prone to produce poorly charged or even uncharged particles, which leads to poor printing results
[0009] On the other hand, in many patent documents of suspension polymerized toner, it is provided to improve the balance between the environmental stability of the toner particles and the low-temperature fixability by shell coating, but the shell coating will inevitably lead to partial The CCA on the surface of the toner core particles is covered, so that the surface of the toner particles is charged unevenly, which reduces the characteristics of uniform charge on the surface of the suspension method toner

Method used

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  • Preparation method of suspension polymerization powdered ink with core-shell structure

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preparation example Construction

[0020] see figure 1 , figure 2 , the invention provides a method for preparing a core-shell structure suspension polymerization toner, comprising the following steps:

[0021] (1) Separately prepare a monomer oil phase containing a certain amount of polar resin, a toner soft-core resin, and an aqueous dispersion for dispersing the monomer oil phase;

[0022] (2) Add the above-mentioned monomer oil phase to the aqueous dispersion liquid, transfer it to the reactor after high-speed shear suspension granulation, and perform the first temperature-rising polymerization reaction to obtain toner particles with soft-core and hard-shell structure;

[0023] (3) Use the soft-core hard-shell structure toner particles as the core layer, add cationic monomer components, and add a water-soluble initiator to carry out the second polymerization reaction, so that the outer surface of the soft-core hard-shell structure toner particles is evenly distributed Surface layer with dense charge;

...

Embodiment 1

[0065] 86 parts of styrene, 14 parts of n-butyl acrylate, 0.6 parts of divinylbenzene, 1.0 parts of n-dodecanethiol, positive charge control agent (FCA-201-PS, styrene-acrylic acid copolymer, produced by Japan Tengcang Kasei Co., Ltd.) 2 parts, carbon black NP150 (manufactured by Degussa Corporation) 7 parts, ester wax WE-95 (manufactured by NOF Corporation) 8 parts, styrene-methacrylic acid-methyl methacrylate 10 parts of ester-α-methylstyrene copolymer (Mw is 10000, Tg is 96°C), the above components are passed through a grinding disperser at room temperature, dissolved and mixed uniformly to prepare a monomer oil phase.

[0066] 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, dispersed at high speed for 1 hour, and then ultrasonically matured at room temperature for 4 hours to obtain magnesium hydroxid...

Embodiment 2

[0070] 86 parts of styrene, 14 parts of n-butyl acrylate, 0.5 parts of divinylbenzene, 0.8 parts of n-dodecanethiol, positive charge control agent (FCA-201-PS, styrene-acrylic acid copolymer, produced by Japan Tengcang Chemical Co., Ltd.) 2 parts, phthalocyanine pigment (C.I.Pigment Blue15:3, manufactured by Clariant) 5 parts, pentaerythritol tetrastearate (manufactured by Shandong Liaocheng Chemical Co., Ltd.) 8 parts, styrene- 30 parts of methacrylic acid-methyl methacrylate copolymer (Mw is 150,000, Tg is 100°C), and the above components are dissolved and mixed uniformly through grinding media at room temperature to prepare a monomer oil phase.

[0071] All the other operations are consistent with Example 1. Table 1 shows the obtained toner characteristic evaluation results.

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Abstract

The invention provides a preparation method of suspension polymerization powdered ink with a core-shell structure. The preparation method comprises the following steps of: (1) respectively preparing monomer oil phase which contains a certain amount of polar resin and forms into powdered ink soft core resin, and aqueous dispersion liquid; (2) adding the monomer oil phase into the aqueous dispersion liquid, shearing, suspending and pelleting at high speed, transferring into a reactor, and carrying out first warming polymerization reaction to obtain the powdered ink particles with a soft core-hard shell structure; (3) taking the powdered ink with the soft core-hard shell structure as a core layer, adding positive ion monomer components, and carrying out second polymerization reaction by a water-soluble initiator to obtain soft core-hard shell powdered ink particles of which the outer surfaces are evenly distributed with intensive charge surface layers; and (4) cleaning and filtering products, sufficiently drying, and adding silicon dioxide. According to the preparation method, the shell layer which is evenly distributed with the intensive charges can be obtained according to the characteristics of the polar resin and the cation monomer component, so that the electrification evenness of the surface of the powdered ink particles can be improved, and the preparation method is good in low-temperature fixation characteristics and environmental stability.

Description

【Technical field】 [0001] The invention relates to the field of toner manufacturing, in particular to a method for preparing chemical toner for electrostatic charge image development through a suspension polymerization process. 【Background technique】 [0002] Toner is a developer material used in laser printers or photocopiers. The operating principle of the printer is roughly summarized as follows: a constant current passes through the charging roller to uniformly charge the surface of the photosensitive drum; the surface of the uniformly distributed photosensitive drum is exposed and discharged by a laser beam to form an electrostatic latent image; Charged, adsorbed on the surface of the photosensitive drum under the action of potential difference to convert the electrostatic latent image development into an image; attracted by the opposite charge of the transfer roller, the image on the surface of the photosensitive drum is transferred to the paper; the image formed by the...

Claims

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Application Information

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IPC IPC(8): G03G9/08G03G9/087G03G9/097
CPCG03G9/093G03G9/0806G03G9/09328G03G9/09371G03G9/09392
Inventor 张媛媛刘志军蒲甜甜孟鸿羊辉
Owner SHENZHEN LEPUTAI TECH CO LTD
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