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Preparing method for styrene-acrylic resin/polyester resin compound type static charge image color matching agent

A technology of electrostatic charge image and polyester resin, applied in developer, electrography, optics, etc., can solve the problems of uneven dispersion of wax, damage to low-temperature fixing performance, and increase of polyester units, etc. The method is simple, reliable, and excellent Offset resistance, high image quality effect

Active Publication Date: 2015-10-28
HUBEI DINGLONG CO LTD
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AI Technical Summary

Problems solved by technology

[0004] Although the polyester structure can ensure the low-temperature fixability of the toner, it is prone to offset phenomenon under high temperature conditions, easy to generate uneven charging at the beginning of charging and after a period of time, resulting in poor image quality, and easy to agglomerate during storage. question
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.
[0005] 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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  • Preparing method for styrene-acrylic resin/polyester resin compound type static charge image color matching agent

Examples

Experimental program
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preparation example Construction

[0030] Preparation of colorant dispersion: 60g carbon black (Cabot company) and 30g dodecyltrimethylammonium chloride and 410g water are stirred and pre-dispersed at room temperature, and then this dispersion is added to the high-speed dispersant for dispersion , By dispersing for 2h, the colorant dispersion liquid was obtained, and its particle size was 120nm.

[0031] Preparation of colorant-containing styrene-acrylic polymer composite emulsion: 75g dodecyltrimethylammonium chloride is dissolved in 1650g water, then it is added in the reactor, 440g of the above-mentioned colorant dispersion is dropped into the reactor, and the temperature is raised to 75°C, add 800g of potassium persulfate aqueous solution (containing 20g of potassium persulfate) to the reaction kettle, then gradually mix 1400g of styrene, 300g of butyl acrylate, 40g of methacrylic acid and 13g of dodecyl mercaptan within 2h. Add it into the reaction kettle, raise the temperature of the system to 80°C after ...

preparation example

[0035] Preparation of wax dispersion: 60g of wax (behenyl behenate), 28g of sodium lauryl sulfate and 130g of water were stirred and dissolved at 90°C, and then the mixture was quickly added to the high-speed dispersant for Dispersion, after 2 hours of dispersion, a milky white wax dispersion liquid with a particle size of 130nm was obtained. The particle size is measured by a Beckman Coulter LS230.

[0036] Dissolve 20g of sodium lauryl sulfate and 2g of decyl alcohol polyoxyethylene ether in 300g of water, then 75g of the above wax dispersion, 180g of acrylic modified bisphenol A epoxy vinyl ester (brand DERAKANE 411), 45g Butyl acrylate and 7.5g of dodecyl mercaptan mixture are added to the reactor, stirred at room temperature to prepare the emulsion prepolymer, the reactor is warmed up to 75°C, and then 150g of potassium persulfate aqueous solution is added in the reactor (the content of potassium persulfate 3g), then the temperature was raised to 80°C, and the temperatur...

preparation example 1

[0046] 100g of emulsion A1 is added in the reactor, the speed of adjusting stirring is 500rpm, then emulsion B1 is gradually added in the reactor within 20 minutes under stirring, then 60g of 1% polyaluminum chloride is added in the reactor, Adjust the pH of the system to 3, start to heat up after stirring for 30 minutes, raise the temperature of the system to 65°C after 30 minutes, then reduce the stirring speed of the system to 200rpm, and then start to detect the change of the particle size of the system, when the particle size of the aggregated particles When increasing to 7 μm, add nonionic surfactant X-405 (Dow Chemical) to the system, then increase the stirring speed to 350rpm, then raise the temperature to 95°C for spherification, when the sphericity of the particles reaches 0.96 (using FPIA-3000 measurement) above, cool, use a centrifuge to filter, wash with water, heat and dry under reduced pressure, and the final particle size is about 6.5um. The toner is obtained b...

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Abstract

The invention relates to a preparing method for a styrene-acrylic resin / polyester resin compound type static charge image color matching agent and provides the preparing method for the color matching agent good in low-temperature image setting property and good in image quality. According to the technical scheme, the styrene-acrylic resin / polyester resin compound type static charge image color matching agent is obtained by agglutinating styrene-acrylic copolymer composite emulsion (A) containing a coloring agent and polyester compound emulsion (B) containing wax. The styrene-acrylic copolymer composite emulsion (A) containing the coloring agent is prepared from the coloring agent, styrene class monomers and acrylic class monomers under the action of a cationic surface active agent through an emulsion polymerization method. The polyester compound emulsion (B) containing the wax is prepared from the wax, unsaturated monomers containing polyester structure units and acrylic class monomers under the action of an anionic surface active agent through the emulsion polymerization method. The preparing method for the styrene-acrylic resin / polyester resin compound type static charge image color matching agent is simple in technology, low in cost and good in compatibility, the color matching agent has the good offset-resisting property and storage stability, and high image quality can be still kept under extreme conditions.

Description

technical field [0001] The present invention relates to a preparation method of toner for electrostatic image development. Background technique [0002] In response to demands such as higher speed, lower energy consumption, and smaller size of printers and copiers in recent years, it is necessary to further improve the low-temperature fixability of toners. Styrene-acrylic resins, which were widely used in the past, were used as binder resin toners. Styrene-acrylic resins have the advantages of low cost, easy high molecular weight and excellent high temperature offset resistance. However, there are great limitations in satisfying energy saving and high-gloss image quality of image formation, 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 application of polyester resin as binder resin toner in high-speed printers a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/08
Inventor 朱双全李小龙肖桂林
Owner HUBEI DINGLONG CO LTD
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