Method for preparing color carbon powder by adopting suspension polymerization method
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A suspension polymerization method and color technology, applied in the fields of electrography, optics, instruments, etc., can solve the problems of unstable properties of inorganic colloidal stabilizers, high difficulty in co-flocculation process control, untreated coloring agents, etc. Stable, easy to operate, good adaptability
Inactive Publication Date: 2015-02-25
HUBEI DINGLONG CO LTD
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The "emulsion polymerization / co-flocculation method" first prepares resin emulsion, pigment dispersion, and wax dispersion respectively, and then mixes the resin emulsion, pigment dispersion, and wax dispersion in the presence of a coagulant to agglomerate the three particles to prepare the color. Toner, this method has the disadvantages of many preparation steps and high difficulty in co-flocculation process control; while the preparation of color toner by suspension polymerization method represented by Canon is to first prepare nano-scale inorganic powder insoluble in water in water. colloidal stabilizer, and then use the inorganic colloidal stabilizer to disperse and granulate the organic phase containing pigments and monomers in water, and then polymerize to obtain colored carbon powder. Influenced by factors, the instability of the properties of the inorganic colloidal stabilizer will eventually lead to the instability of the quality of the toner
On the other hand, in order to ensure the quality of toner, the choice of raw materials is also more limited. When using ordinary suspension polymerization to prepare color toner, there are a large number of hydroxyl groups, acidic and basic groups on the surface of the colorant because the colorant is not treated. The presence of these polar groups has a strong inhibitory effect on free radical polymerization, making it difficult to use a large number of varieties and types of colorants
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preparation example 1
[0038] Put 60 parts of toluene, 40 parts of isopropanol, 59 parts of styrene, 29 parts of butyl acrylate, 12 parts of aminostyrene, and 2 parts of initiator azobisisobutyronitrile into the reaction kettle, and stir evenly , heated to 75° C. for 10 hours, distilled off the solvent under reduced pressure, and cooled to obtain a light yellow transparent resin with a mass-average molecular weight Mw=40830 and a glass transition temperature Tg=72 degrees, which was called resin 1.
preparation example 2
[0040] Put 60 parts of toluene, 40 parts of isopropanol, 58 parts of styrene, 32 parts of butyl acrylate, 10 parts of sodium p-styrenesulfonate, and 2 parts of initiator azobisisoheptanonitrile into the reactor , stirred evenly, heated up to 67° C. and reacted for 10 hours, distilled off the solvent under reduced pressure, and cooled to obtain a light yellow transparent resin with a mass-average molecular weight Mw=48670 and a glass transition temperature Tg=65 degrees, which was called resin 2.
[0041] Preparation Example 1 of Color Masterbatch
[0042] Drop into 50 parts of carbon black (Monarch 700, Cabot, Cabot) and 50 parts of resin 1 in the melting kneading machine, obtain color masterbatch 1 through melt mixing, extruding, crushing, color masterbatch 1 is in toluene After dissolving, the particle diameter of the carbon black measured with a nanometer particle size analyzer is 116nm.
[0043] Preparation example 2 of color masterbatch
[0044] Drop into 43 parts of pi...
preparation example 3
[0046] Drop into 47 parts of pigment yellow 185 (Paliotol Gelb D 1155, BASF, BASF) and 53 parts of resin 1 in the melting kneader, obtain color masterbatch 3 through melt mixing, extruding, crushing, color masterbatch 3 is mixed in toluene After dissolving in medium, the particle size of Pigment Yellow 185 was measured with a nanometer particle size analyzer to be 376nm.
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Abstract
The invention relates to a method for preparing color carbon powder by adopting a suspension polymerization method, and solves the problems that carbon powder is instable in quality and the selection of raw materials is limited in a traditional suspension polymerization method. According to the technical scheme, the method comprises the following steps: melting a coloring agent and resin, mixing the melt coloring agent and resin so as to obtain a mixture I, extruding the mixture I and crushing to obtain color master batch; adding the color master batch, wax and an initiator into monomers to obtain a mixture II, heating and stirring to dissolve the mixture II to obtain an organic phase containing the coloring agent, resin, initiator, wax and monomers; adding the organic phase into an aqueous solution containing a surface active agent, carrying out shearing dispersing on the organic phase in the aqueous solution to obtain turbid liquid, polymerizing the turbid liquid in a heating manner to obtain a color carbon powder matrix, finally filtering the color carbon powder matrix, washing the filtered color carbon powder matrix, drying, and mixing the color carbon powder matrix with additives to obtain the color carbon powder. The method is simple in procedure, low in process difficulty, easy to control, wide in raw material selection range and relatively few in adverse impact factors, and the obtained color carbon powder is relatively narrow in granularity distribution, relatively few in small particles and stable and reliable in quality.
Description
technical field [0001] The present invention relates to a preparation method of color by suspension polymerization method for electrostatic charge development of electrophotographic copiers and printers. Background technique [0002] Color toner is an important consumable for electrostatic charge development color laser printers and color digital copiers. It is mainly composed of resins (including styrene-acrylic resins and polyester resins, etc.), colorants (pigments and dyes), additives Formulations, etc.) composition. According to the color of the colorant used in toner, toner is divided into colored toner and black toner. The traditional preparation method of carbon powder is the "crushing method" (physical method), that is, the required resin, colorant, and additives are melted and mixed, low-temperature mechanical crushed, jet crushed, and classified to obtain a carbon powder with a particle size of about 10 μm. . However, this preparation method has defects such as...
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