Colorful powdered ink used for static development and preparation method thereof

A color toner, electrostatic technology, applied in the direction of developer, electrography, optics, etc., can solve the problems of inability to improve image density, poor colorant dispersibility, low toner particle resistance, etc., to achieve narrow particle distribution, chargeability Good, good spherical effect

Active Publication Date: 2012-05-09
SHENZHEN LEPUTAI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above method achieves the functional separation performance of the additives in the toner, this preparation method has the problems of poor dispersibility of the colorant, the problem that the image density cannot be improved, the resistance of the toner particles is small, and there are also problems of poor durability.

Method used

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  • Colorful powdered ink used for static development and preparation method thereof
  • Colorful powdered ink used for static development and preparation method thereof
  • Colorful powdered ink used for static development and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1) Preparation of resin emulsion A

[0039] Add 270g of deionized water, 3.6g of sodium lauryl sulfate, 4.5g of OP-10, 232g of styrene, and n-butyl acrylate to the first reactor equipped with a water bath (40°C) and a stirring device (300rpm). 62g, 2.6g n-dodecyl mercaptan, to form a monomer emulsion; into another second reactor equipped with a water bath (80°C) and a stirring device (400rpm), 300g deionized water and 1.8 sodium lauryl sulfate were added g. Sodium bicarbonate 0.194g. Under the condition of nitrogen purging, 80g of the monomer emulsion emulsified in the first reactor was added to the second reactor, and the initiator solution (2.0g ammonium persulfate, 61g deionized water) was added dropwise at the same time. After 30 minutes, Then, the remaining monomer emulsion in the first reactor was slowly added dropwise to the second reactor, and the remaining monomer emulsion was dropped after the completion of the dripping and kept for 2 hours and dropped to room t...

Embodiment 2

[0049] Preparation of black toner particles by emulsion aggregation method

[0050] The preparation process is the same as 1)-4) in Example 1, except that the mass ratio of resin emulsion A and B in step 5) is 1, and the results of preparing toner particles are shown in Table 1.

Embodiment 3

[0052] Preparation of black toner particles by emulsion aggregation method

[0053] The preparation process is the same as 1)-4) in Example 1, except that the mass ratio of resin emulsion A and B in step 5) is 2, and the result of preparing toner particles is shown in the following table.

[0054] Comparison of results of Examples 1-3

[0055] Item

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PUM

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Abstract

The invention provides a colorful powdered ink used for static development. Grains with nucleus-shell structures are formed into powdered ink grains in an agglomeration mode; the powdered ink grains contain a nucleus-forming resin A and a shell-forming resin C which are made of same or different components; and the total content of the two resins accounts for 60%-85% of the powdered ink grains. The invention also provides a preparation method of the colorful powdered ink, and the method comprises the following steps: quickly dispersing a colorant dispersing solution, a wax dispersing solutionand an emulsion of the nucleus-forming resin A, thereby forming agglomerated nucleus grains B in a system; then adding a mixture of the emulsion of the shell-forming resin C and a charge control agent, thereby agglomerating into the grains D with the nucleus-shell structures around the nucleus grains B; increasing the temperature so that the grains D with the nucleus-shell structures are agglomerated into powdered ink grains E; and performing spherical treatment on the powdered ink grains E, thereby forming the powdered ink grains F. The powdered ink grains F prepared according to the preparation method provided by the invention are excellent in spherical degree, narrow in grain distribution, excellent in electric property and excellent in durability. The problems of photosensitive drums and developing roller pollution caused by easy separation between a colorant and a release agent are solved.

Description

【Technical Field】 [0001] The invention relates to a toner for electrostatic development, in particular to a toner with a composite core-shell structure and a true spherical shape and a preparation method thereof. 【Background technique】 [0002] In the prior art, most toners for electrostatic development are pulverized toners prepared by a kneading-pulverization-classification process, and a small part are chemical toners prepared by a chemical process. The pulverization method requires a lot of energy in the preparation process of toner, and the particle size of the toner is too large. Under the same printing conditions, the amount is large, the resolution of the printed matter is poor, and the utilization rate of the toner is low. The toner prepared by chemical toner has a small particle size, low energy consumption for preparation, and high toner utilization. However, different chemical preparation processes have their own shortcomings. [0003] The method of preparing toner by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/08G03G9/097G03G9/087
Inventor 闫丽佳羊辉李绍昌张海清韩昌哲
Owner SHENZHEN LEPUTAI TECH CO LTD
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