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A kind of polyurethane modified polyester resin toner and preparation method thereof

A technology of polyurethane modification and polyester resin, which is applied in the direction of developer, instrument, optics, etc. It can solve the problems of toner particle agglomeration, easy to produce streaks, white spots, etc., so as to improve stability and heat resistance offset sexual effect

Active Publication Date: 2022-02-01
HUBEI DINGLONG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the toner is deformed, cracked, or chipped due to such impact, it will cause contamination of the limiter blade, filming on the photoreceptor, and image defects such as streaks and white spots on the image are likely to occur.
During transportation and storage, high temperature and extrusion process can also cause problems such as agglomeration of toner particles

Method used

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  • A kind of polyurethane modified polyester resin toner and preparation method thereof
  • A kind of polyurethane modified polyester resin toner and preparation method thereof
  • A kind of polyurethane modified polyester resin toner and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0050] The preparation method of the pigment emulsion is as follows:

[0051] 30g of carbon black (Cabot company), 7.5g of sodium lauryl sulfate and 62.5g of water were stirred and pre-dispersed at room temperature, and then the dispersion was added to a high-speed dispersant for dispersion, and after 2 hours of dispersion, the pigment was obtained The particle diameter of the emulsion is 182nm as measured by a nano particle size analyzer.

[0052] The preparation method of wax emulsion is as follows:

[0053] Stir and dissolve 30g of wax (behenyl behenyl behenate), 7.5g of sodium lauryl sulfate and 62.5g of water at 90°C, then quickly add this mixture into the high-speed dispersant for dispersion, and pass 2h The dispersion of milky white wax emulsion is obtained, and its particle diameter is 160nm as measured by a nano particle size analyzer.

Embodiment 1

[0054] Embodiment 1 A kind of preparation method of polyurethane modified polyester resin toner

[0055] S1. Introduce the following materials into a reactor equipped with a stirrer and a thermometer under nitrogen flow,

[0056]

[0057] Wherein, the composition molar ratio of the polyester resin is as follows, polyoxypropylene (2.2)-2,2-bis(4-hydroxyphenyl) propane: terephthalic acid: dodecenyl succinic anhydride: trimellitic anhydride = 110:50: 47:3, weight average molecular weight (Mw) = 26500, glass transition temperature (Tg) = 72°C, hydroxyl value = 9mgKOH / g.

[0058] After the above raw materials were mixed, the temperature was raised to 60° C. and stirred for 20 hours to obtain a polyurethane modified resin solution. After the polyurethane has formed and completed the reaction, the isocyanate content is zero.

[0059] S2. After the reaction in step S1 is completed, add 2 parts by mass of sodium lauryl sulfate, and then drop 500 parts by mass of ion-exchanged wate...

Embodiment 2

[0062] Embodiment 2 A kind of preparation method of polyurethane modified polyester resin toner

[0063] S1. Introduce the following materials into a reactor equipped with a stirrer and a thermometer under nitrogen flow,

[0064]

[0065] Wherein, the composition molar ratio of polyester resin is as follows, composition (molar ratio)=polyoxypropylene (2.2)-2,2-bis(4-hydroxyphenyl) propane: fumaric acid: dodecenyl succinic anhydride=102 :90:10, weight average molecular weight (Mw) = 8500, glass transition temperature (Tg) = 67°C, hydroxyl value

[0066] =8mgKOH / g.

[0067] After the above raw materials were mixed, the temperature was raised to 60° C. and stirred for 20 hours to obtain a polyurethane modified resin solution. After the polyurethane has formed and completed the reaction, the isocyanate content is zero.

[0068]S2. After the reaction in step S1 is completed, add 2 parts by mass of alkyl diphenyl ether disulfonate, and then uniformly drop in 750 parts by mass ...

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Abstract

The invention discloses a polyurethane modified polyester resin toner and a preparation method thereof. The preparation method comprises: dissolving a polyester resin, an isocyanate-based compound and a polyol in a good solvent to prepare a polyurethane modified resin solution, and The polyurethane modified resin solution is sequentially added with surfactant and ion-exchanged water, and the good solvent is removed to obtain nano-scale resin particle emulsion, and the nano-scale resin particle emulsion is co-flocculated with pigment emulsion and wax emulsion to obtain the product. The present invention takes into account the low-temperature fixing properties of the toner by copolymerizing polyester resins, polyols with crystallization properties, and isocyanate-based compounds to form a block-structured bonding resin. At the same time, by introducing a polyurethane structure, the toner Thermal offset resistance to mechanical shock during printing improves toner stability during transportation.

Description

technical field [0001] The invention belongs to the field of toner and toner, and relates to a preparation method of a toner for electrostatic charge image development, and more specifically, to a polyurethane modified polyester resin toner and a preparation method thereof. Background technique [0002] In recent years, as the speed of the latest generation of copiers has increased, there has been an increasing demand for toner resins for electronic copying with excellent low-temperature fixing properties. Modern toner resins are required to operate at a lower operating temperature and reduce the heat applied to the fixing device to achieve high-speed, energy-saving and miniaturized printing. Therefore, it is necessary to lower the glass transition point of the toner so that the toner can achieve low-temperature fixing. In order to obtain these effects, polyester resins are widely used in the preparation of toners, such as CN200710166710.1 and US 8715897, etc., by introduci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G9/08G03G9/087
CPCG03G9/0804G03G9/08755G03G9/08795G03G9/08797
Inventor 李小龙肖桂林李清涛朱顺全
Owner HUBEI DINGLONG CO LTD