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Toner and preparation method thereof

A toner and colorant technology, applied in the field of toner, can solve the problems of printing quality and environmental adverse effects, unreasonable printing effect, easy caking in storage, etc., achieve good image quality, reduce burial, and improve storage performance Effect

Pending Publication Date: 2021-11-26
HUBEI DINGLONG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] With the use of polyester resins as binder resin toners in high-speed printers and copiers, resins with excellent low-temperature fixability and high-gloss polyester resin structures are called the mainstream of toners. Polyester structures Although it can ensure the low-temperature fixability of the toner, it is prone to offset phenomenon under high temperature conditions, and it is easy to produce uneven charging at the beginning of charging and after a period of time, resulting in poor image quality and easy caking during storage; Its preparation method usually adopts conventional methods such as phase change emulsification method and self-emulsification method, but when the resin particles are dispersed into water, a large amount of organic solvent or a certain amount of surfactant or some groups that do not care about the printing effect will be used. , these substances can cause potential adverse effects on the quality of printing and the environment

Method used

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  • Toner and preparation method thereof
  • Toner and preparation method thereof

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Experimental program
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preparation example Construction

[0029] Preparation method of toner

[0030] Use emulsification method among the present invention, comprise the following steps:

[0031]

[0032] Add carboxylic acid compounds, alcohol compounds and catalysts into the reaction vessel, under the condition of nitrogen protection, stir and react at 70-150°C for 5-8 hours to obtain polyester resin

[0033] In the present invention, the polycondensation reaction of the polyester resin is performed at a temperature lower than or equal to 150°C.

[0034] The reaction temperature is preferably higher than or equal to 70°C but not higher than 150°C; more preferably higher than or equal to 110°C but not higher than 140°C.

[0035] It is preferable to set the reaction temperature to be higher than or equal to 70° C., since there will be no decrease in reactivity due to deterioration of monomer solubility or catalyst activity, and no inhibition of increase in molecular weight. It is also preferable to set the reaction temperature no...

Embodiment 1

[0109] Preparation of Toner-T1

[0110] 0.01mol (1.66g) terephthalic acid, 0.01mol (1.16g) fumaric acid, 0.01mol (1.18g) succinic acid, 0.02mol (6.32g) bisphenol A ethylene oxide adduct, 0.004mol (0.472 g) Butanediol, 0.005mol (0.590g) 1,6-hexanediol, 0.0979g (0.00032mol) dibutyltin oxide were added to the reaction vessel, stirred under nitrogen protection, and polycondensed at 130°C for 7 hours, Then add 0.003mol (0.618g) of 1,10-decanedithiol and 0.002mol (0.284g) of benzenedithiol, and continue to react at 150°C for 7h to obtain a polyester resin.

[0111] Disperse the prepared polyester resin in a homogenizer at 3000rpm for 3 minutes, add water to adjust the solid content to 10%, and then add 0.003mol mPEG-SH-1000 (mPEG-SH-1000 means that the molecular weight of mPEG-SH is 1000) , after air oxidation, high-speed stirring and dispersion to obtain polyester resin emulsion.

[0112] Add 0.8g of carbon black dispersion and 0.8g of carnauba wax dispersion, adjust the pH val...

Embodiment 2

[0114] Preparation of Toner-T2

[0115] 0.008mol (1.328g) terephthalic acid, 0.013mol (1.508g) fumaric acid, 0.009mol (1.062g) succinic acid, 0.018mol (5.688g) bisphenol A ethylene oxide adduct, 0.005mol (0.59 g) Butanediol, 0.006mol (0.709g) 1,6-hexanediol, 0.0979g (0.00032mol) dibutyltin oxide were added to the reaction vessel, stirred under the protection of nitrogen, and polycondensed at 70°C for 8 hours, Then add 0.003mol (0.618g) of 1,10-decanedithiol and 0.002mol (0.284g) of benzenedithiol, and continue to react at 150°C for 7h to obtain a polyester resin.

[0116] Disperse the prepared polyester resin in a homogenizer at 5000rpm for 5 minutes, add water to adjust the solid content to 18%, and then add 0.0033mol mPEG-SH-1000 (mPEG-SH-1000 means that the molecular weight of mPEG-SH is 1000) , after air oxidation, high-speed stirring and dispersion to obtain polyester resin emulsion.

[0117] Add 0.8g of carbon black dispersion and 0.8g of carnauba wax dispersion, adj...

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Abstract

The invention discloses a toner and a preparation method thereof. Aromatic diacid and dithiol are subjected to an esterification reaction, novel polyester resin is prepared through an emulsification method, the toner prepared from the polyester resin shows excellent developing characteristics, the low-temperature fixability of the toner is guaranteed, and the toner has low probability of deviation under a high-temperature condition, uniform electrification at the initial stage of electrification and after a period of time, excellent image quality of printed images and good storage property, and not only improves the printing and copying quality, but also reduces the pollution to the environment.

Description

technical field [0001] The invention belongs to the technical field of toner, and in particular relates to a toner and a preparation method thereof. Background technique [0002] In recent years, printers and copiers are increasingly required to increase their speed, energy saving, and miniaturization, and it is necessary to further improve the low-temperature fixability of toners. Styrene-acrylic resins, which have been widely used in the past, are used as binder resin toners, but styrene-acrylic resins have great limitations in terms of energy saving in image formation, high-gloss image quality, and especially in low-temperature fixing. Therefore, the rapid development of polyester resin as binder resin toner has been promoted, and it has become the trend of a new generation of toner for printing and copying. [0003] With the use of polyester resins as binder resin toners in high-speed printers and copiers, resins with excellent low-temperature fixability and high-gloss ...

Claims

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Application Information

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IPC IPC(8): G03G9/087G03G9/08
CPCG03G9/08755G03G9/0806G03G9/0827G03G9/0819
Inventor 张季平高越朱顺全
Owner HUBEI DINGLONG CO LTD
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