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Toner and preparation method thereof

A toner and surfactant technology, applied in the field of toner and its preparation, can solve the problems of insufficient compatibility, poor uniformity of toner particle size and shape, uneven dispersion of wax, etc., and achieve excellent low-temperature fixing and Preservability, improvement of storage stability, effect of ensuring thermal stability

Active Publication Date: 2019-04-23
鼎龙(宁波)新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the polyester structure can ensure the low-temperature fixability of the toner, it is prone to offset phenomenon under high temperature conditions, and it is prone to uneven charging at the initial stage of charging and after a period of time, resulting in poor image quality and easy caking during storage And other issues
In order to make up for this deficiency, increasing the molecular weight of the polyester unit and increasing the viscosity will not only impair the low-temperature fixing performance, but also make it difficult to spheroidize the toner during production.
[0004] In order to effectively solve the low-temperature fixability of toner and the excellent image quality of images, the patent CN 201010531001.0 effectively utilizes the advantages of two kinds of styrene-acrylic resin and polyester resin, and directly blends the polyester resin and styrene-acrylic resin to obtain a composite toner Toner, but this series of patents is simply mixing two resins, because of insufficient compatibility, the obtained toner fixation range is narrow
Others consider using monomers containing polyester structural units and styrene-based copolymer resins, then mixing and melting with styrene-acrylic resins, and using physical pulverization to obtain composite toners. This method has the limitations of physical toners. , such as uneven dispersion of colorant, wax, toner particle size and shape uniformity, large particle size and other defects, compared with toners prepared by chemical methods, it is difficult to match the requirements of high-quality, high-speed printers

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0038] According to a first aspect of the present invention, a method for preparing a binder resin emulsion for toner is provided, comprising the following steps:

[0039] (A) adding polyester resin and isocyanate to the solvent formed by styrene monomer and acrylate monomer, polyester resin and isocyanate are reacted to obtain a mixed solution containing polyurethane-modified polyester resin;

[0040] The hydroxyl value of the polyester resin is 1-20 mg KOH / g, the molar ratio of the isocyanate group of the isocyanate to the hydroxyl group of the polyester resin is 0.8-1:1, and the weight average molecular weight of the polyester resin is 3000-25000 g / mol;

[0041] (B) add surfactant and water to the mixed solution that step (A) obtains, after emulsification, add initiator, carry out seed emulsion polymerization, obtain polyurethane seed emulsion;

[0042] (C) Provide a pre-emulsion formed by styrene monomers, acrylate monomers, surfactants and water, add the pre-emulsion and ...

Embodiment 1

[0102] A preparation method of toner, comprising the following steps:

[0103] (1) Mixed solution containing polyurethane modified polyester resin

[0104] In a 3-liter four-neck flask equipped with a constant temperature oil bath, a stirring device, a thermometer, a reflux condenser, a nitrogen inlet pipe, and a dropping funnel, first pass nitrogen gas to fully replace the oxygen and water in it, and then raise the temperature to 50°C , add 297g styrene, 64g n-butyl acrylate, 18g hydroxyethyl methacrylate, 6.706g isophorone diisocyanate and 211.59g polyester resin A [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)=8,500, glass transition temperature (Tg)=67 ℃, Hydroxyl value = 8mg KOH / g, acid value = 4mg KOH / g], keep stirring for 1 hour, polyester resin and isocyanate react to obtain a mixed solution containing polyurethane-modified polyester resin....

Embodiment 2-5

[0119] The difference between Examples 2-5 and Example 1 is that the amount of isophorone diisocyanate used in step (1), that is, the molar ratio of isocyanate to hydroxyl is different, as shown in Table 1.

[0120] The molar ratio of table 1 isocyanate and hydroxyl

[0121]

[0122]

[0123] The particle diameter of the binder resin emulsion for toner obtained in Example 4 was 155 nm. Example 5 After the polyester resin and isocyanate react completely in step (1), the measured isocyanate content is 8%. When deionized water is added in step (3), the system thickens and cannot form an emulsion, and subsequent steps cannot be carried out .

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Abstract

The invention provides a toner and a preparation method thereof, and belongs to the technical field of toners. The preparation method of the toner comprises the steps of taking a styrene monomer and an acrylate monomer as solvents of polyester resin and isocyanate, reacting the polyester resin with the isocyanate to obtain a mixed solution containing polyurethane-modified polyester resin, emulsifying the mixed solution, performing polymerization by a seed emulsion to obtain a binder resin emulsion for the toner, and mixing the binder resin emulsion with a coloring agent, a releasing agent anda flocculating agent obtain the toner. The toner obtained by the preparation method has the advantages that the toner is of a core-shell structure in which the polyurethane-modified polyester resin istaken as a core and styrene-acrylic resin is taken as a shell, and can improve the durability of mechanical impact and effectively reduce the problems including agglomeration, clogging and the like of the toner caused by the impact in electronic equipment, thereby improving the storage stability during image output to achieve excellent low-temperature fixation and preservability of the toner.

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. As a result, the rapid development of polyester resin as a binder resin toner has become a trend for a new generation of toners for printing and copiers. [0003] With the use of polyester resins as binder resin toners in high-speed printers and copiers, polyester resin structures with excellent low-temperature fixability and high glossine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/08G03G9/087
CPCG03G9/0806G03G9/08755
Inventor 肖桂林李小龙李清涛朱顺全
Owner 鼎龙(宁波)新材料有限公司
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