Toner and preparation method thereof

A technology of toner and isocyanate, applied in the direction of developer, electrography, optics, etc., can solve the problems of increased energy consumption, deterioration of fixtures, poor thermal efficiency, etc., to reduce caking, excellent weather resistance, and improve durability. Effect

Active Publication Date: 2019-04-16
HUBEI DINGLONG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these resins usually have a high softening point and poor thermal efficiency, and the temperature of the heating roller must be increased to obtain a satisfactory fixing effect
This will bring adverse phenomena such as deterioration of fixtures, curling of paper, increase in energy consumption, etc.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0039] According to a first aspect of the present invention, a kind of preparation method of isocyanate-styrene-acrylic composite resin emulsion is provided, comprising the following steps:

[0040] a) styrene monomer, acrylic acid and acrylic acid ester monomer carry out solution polymerization to obtain a solution containing styrene-acrylic resin;

[0041] Wherein, the acid value of styrene-acrylic resin is 30-50mg KOH / g, and the weight-average molecular weight of styrene-acrylic resin is 2000-10000g / mol;

[0042] b) adding isocyanate to the solution obtained in step a), reacting isocyanate with styrene-acrylic resin to obtain an isocyanate-styrene-acrylic composite resin solution, and then obtaining an isocyanate-styrene-acrylic composite resin emulsion through a phase inversion emulsification method;

[0043] Wherein, the acid value of the isocyanate-styrene-acrylic composite resin is 10-20mg KOH / g, and the weight average molecular weight of the isocyanate-styrene-acrylic ...

Embodiment 1

[0100] A preparation method of toner, comprising the following steps:

[0101] (1) Provide a 10-liter reactor equipped with a constant temperature oil bath, stirring device, thermometer, reflux condenser, nitrogen inlet pipe and dropping funnel, first feed nitrogen, fully replace the oxygen and water in the reactor, and then The temperature was raised to 50°C, 1100g of butanone was added, and the temperature was raised to 80°C.

[0102] Provide the monomer mixed solution that is made up of 180g butyl acrylate, 40g acrylic acid, 30g methyl methacrylate and 780g styrene, provide the initiator solution that 24g benzoyl peroxide is dissolved in the formation of 100g butanone; Monomer mixed solution Add it dropwise into the reactor simultaneously with the initiator solution, keep the temperature at 88° C. and stir for 4 hours, then lower the temperature to 40° C. to obtain a solution containing styrene-acrylic resin.

[0103] Determination of polymer molecular weight: Add deionize...

Embodiment 2-3

[0114] The only difference between Examples 2-3 and Example 1 is that the amount of isophorone diisocyanate (IPDI) in step (2) is changed. The details are shown in Table 1.

[0115] The consumption of different groups of isophorone diisocyanates in table 1

[0116]

[0117] Example 2 obtained an isocyanate-styrene-acrylic composite resin emulsion with a particle size of 176nm, a weight-average molecular weight (Mw)=32,000, a glass transition temperature (Tg)=70°C, and an acid value=13mgKOH / g.

[0118] Example 3 obtained an isocyanate-styrene-acrylic composite resin emulsion with a particle size of 170nm, a weight-average molecular weight (Mw)=37,000, a glass transition temperature (Tg)=65°C, and an acid value=20mgKOH / g.

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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 provided by the invention comprises a step of performing solution polymerization on a styrene monomer and an acrylate monomer to obtain a solution containing a styrene-acrylic resin, and a step of adding an isocyanate to obtain an isocyanate-styrene-acrylic compositeresin solution, obtaining an isocyanate-styrene-acrylic composite emulsion through a phase inversion emulsification method, and mixing a binder resin emulsion, a colorant, a release agent and a flocculant to obtain the toner. According to the toner obtained by the method, the durability of the toner against mechanical impact can be improved, the problems of agglomeration, clogging and the like caused by the impact of the toner in the electronic device can be effectively reduced, and therefore, the storage stability at the time of outputting an image can be improved.

Description

technical field [0001] The invention belongs to the technical field of electrophotographic toner for printing and copying, and in particular relates to a toner and a preparation method thereof. Background technique [0002] Conventional electrophotography includes the following steps: uniformly charge the photoconductive insulating layer, then expose, selectively dissipate the charge on the exposed part to form an electrostatic latent image, and deposit the charge of the charged powder with color. The toner forms a visual image (developing step), the resulting visual image is transferred to a transfer material, such as transfer paper (transferring step), and the visual image is permanently fixed by heat, pressure, or other suitable fixing method (image fixed). Therefore, the toner should have not only the properties required in the developing step but also the properties required in the transfer and fixing steps. [0003] Generally, toner will be subjected to mechanical fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/08
CPCG03G9/0804
Inventor 李清涛肖桂林李小龙朱顺全
Owner HUBEI DINGLONG CO LTD
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