Preparation method of micron-sized polystyrene microspheres with controllable particle sizes

Abstract

The invention provides micron-sized polystyrene microspheres with controllable particle sizes and a preparation method of the micro-sized polystyrene microspheres. The method comprises the following steps: (1) dissolving lignosulfonate in a mixed solvent of absolute ethyl alcohol and water to obtain a lignosulfonate solution; (2) keeping the lignosulfonate solution in a stirring state under the microwave condition of 60-80 DEG C, dropwise adding a styrene monomer and an azo initiator into the lignosulfonate solution at a certain sample injection speed for 1-2 h, and carrying out heat preservation reaction for 1-3 h; and (3) after the reaction is finished, repeatedly cleaning by using the absolute ethyl alcohol and ultrapure water, then separating solid substances, and drying to obtain white powder which is the micron-sized polystyrene microspheres with the controllable particle sizes. The method disclosed by the invention has the advantages of high conversion rate and high preparationrate, the obtained polystyrene microspheres are controllable in particle size and good in uniformity and monodispersity, and the monodispersity is 0.1-0.2.

Description

technical field [0001] The invention belongs to the technical field of polymer preparation, and in particular relates to a method for preparing micron-sized polystyrene microspheres with controllable particle diameters. Background technique [0002] Monodisperse micron-sized polystyrene microspheres have extremely high specific surface area and reactivity due to their monodisperse and uniform size, and have excellent adsorption properties, mechanical properties and chemical properties. Therefore, it is widely used in various fields such as cosmetics, medical diagnosis, optical imaging, catalytic loading carrier, multifunctional coating, and chromatographic analysis. [0003] Therefore, it is of great significance to design and prepare a monodisperse micron-sized polystyrene microsphere with controllable particle size. [0004] At present, there have been a lot of research and reports on the preparation methods of polystyrene microspheres, but there are still many problems. ...

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Problems solved by technology

People such as Li Ziqiao (patent number: CN 102675501 A) have reported a kind of preparation method of polystyrene microsphere, promptly by adding water and emulsifier in reaction system, add a certain amount of reaction monomer again, pre-emulsification 0.5 -2.5 hours, drip initiator reaction 12-48 hours again under nitrogen protection, finally obtain product by repeated centrifugation, but the reaction time of this method is too long, the process is complicated, and consumes a large amount of energy; people such as Liu Qingquan (patent No. : CN 102408508 A) provides a method for preparing monodisperse cationic polystyrene microspheres with controllable particle size, that is, in the process of reaction by adding cationic initiator azobisisobutylamidine hydrochloride Release cationic groups and finally adsorb on the surface of the ball to achieve cationic modification, but the process is complicated and consumes a lot of energy; Chen Jianding et al. (Patent No.: CN 1793187 A) invented a monodisperse polystyrene with continuously controllable particle size The preparation method of microspheres, that is, by adjusting the ratio of mixed monomers of styrene and acrylic acid, polystyrene microspheres with different particle sizes can be obtained

However, the reported preparation method is cumbersome and complicated, and the raw materials are expensive, which has great limitations for common medical, catalysis and other fields.

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