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Toner and its preparation method

A technology of toner and isocyanate, applied in developer, instrument, optics, etc., can solve problems such as paper curling, poor thermal efficiency, and deterioration of fixing devices

Active Publication Date: 2022-01-14
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

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 its preparation method

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, belonging to the technical field of toners. The invention provides a preparation method of toner, comprising the following steps: performing solution polymerization of styrene monomer and acrylate monomer to obtain a solution containing styrene-acrylic resin; then adding isocyanate to obtain isocyanate-styrene-acrylic compound Resin solution, and then the isocyanate-styrene-acrylic composite resin emulsion obtained by the phase inversion emulsification method, and the binder resin emulsion is mixed with a colorant, a release agent and a flocculant to obtain a toner. The toner obtained by the method can improve the durability of the toner to mechanical impact, effectively reduce problems such as agglomeration and clogging caused by the impact of the toner in electronic equipment, thereby improving storage stability when outputting images.

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 Patents(China)
IPC IPC(8): G03G9/08
CPCG03G9/0804
Inventor 李清涛肖桂林李小龙朱顺全
Owner 鼎龙(宁波)新材料有限公司
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