Polymer microsphere with controllable particle size and method for preparing same

Abstract

The invention provides a polymer microsphere with a controllable particle size and a method for preparing the polymer microsphere. The method comprises the following steps of: (1) preparing a water phase containing an emulsifier, wherein 0.01-0.15 part by weight of emulsifier is added to every 100 parts by weight of water, and preparing an oil phase containing a monomer and an initiator, wherein 0.5-5 parts by weigh of initiator and 20.0-50.0 parts by weight of monomer are added to every 100 parts by weight of oil; (2) increasing pressure on one side of a membrane by adopting the membrane emulsification method, pressing the mixture of the water phase and the oil phase into the membrane to obtain an uniform emulsion, wherein the volume ratio of the water phase to the oil phase is (1:3) to (1:5); and (3) enabling the emulsion obtained in the step (2) to be subjected to polymerization reaction for 10-24 hours to obtain the polymer microsphere. The technical scheme solves the problems that the original mixing method is complex in process flow, has a high requirement for raw materials, equipment and process conditions and consumes a large amount of energy. According to the technical scheme, the method comprises the steps of: dissolving a dye into the oil phase, mixing the oil phase with the water phase, emulsifying under a certain pressure by using a membrane emulsification device, and enabling the emulsion to be subjected to polymerization reaction to obtain the colored microsphere.

Description

technical field [0001] The invention relates to the field of synthesis of polymer microspheres, in particular to polymer microspheres with controllable particle size and polymer microspheres prepared therefrom. These colored microspheres can be used for toner used in color copiers and printers. Background technique [0002] The traditional preparation method of color toner is "melting method", that is, resin (mainly styrene-butyl acrylate copolymer), colorant (pigment or dye), additive (charge regulator, release agent, etc.) are mixed uniformly After high-temperature blending, extrusion, cooling, crushing, ultra-fine crushing, grading, and finally adding some external additives that can change its fluidity, grinding to obtain a color toner with a particle size of about 10 μm. However, this preparation method has complicated process, high energy consumption and high cost. The particle size of the obtained product is relatively large, the particle size distribution is wide, t...

AI Technical Summary

Problems solved by technology

Although the suspension polymerization method has improved a lot compared with the original melting pulverization method, its energy consumption is reduced, but the particle size of the prepared colored particles is between 5 and 30 μm, and the prepared particle size distribution is still wide

And the particle size of the color toner prepared by the existing emulsion polymerization method is smaller

However, this method uses mechanical stirring to emulsify, so that the particle shape obtained after polymerization is still difficult to control

The obtained resin has poor compatibility with the pigment, and the pigment is easy to fall off during printing