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A kind of polystyrene magnetic microsphere and preparation method thereof

A technology of polystyrene microspheres and magnetic microspheres, which is applied in the preparation of microspheres, microcapsule preparations, and the magnetism of organic materials/organic magnetic materials. It can solve the problem that magnetic beads are easily destroyed by ultrasound, difficult to control, and have poor magnetic response And other issues

Active Publication Date: 2021-09-14
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The in-situ method is to prepare polystyrene (PS) microspheres first, absorb iron ions into the interior after swelling, and then react to generate magnetic particles. Although the microspheres prepared by this method have uniform particle diameters, the process is cumbersome and difficult to control. , and due to the low content of adsorbed iron ions, the magnetic response is poor
At the same time, these magnetic beads have the problem that they are easily damaged by ultrasonic waves during use.

Method used

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  • A kind of polystyrene magnetic microsphere and preparation method thereof
  • A kind of polystyrene magnetic microsphere and preparation method thereof
  • A kind of polystyrene magnetic microsphere and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] 1. Synthesis of linear nano-polystyrene microspheres

[0061] Measure 5mL of purified St monomer, 50mL of pure water and 0.1g of SDS and mix it with ultrasound to form a uniform emulsion, then add 0.1g of KPS to the four-necked flask, and put the four-necked flask into a normal temperature water bath In the pot, access to condensed water and high-purity N 2 , adjust the stirring speed to 250r / min, start to heat up to 70°C after 15min, and end the reaction after 8h.

[0062] Add a small amount of FeCl dropwise to the emulsion formed by the reaction 3 The aqueous solution was used to make it flocculate, and the supernatant was removed after centrifugation again, and the precipitate was washed three times with water and absolute ethanol before being used for later use. The particle size of the synthesized linear nano polystyrene microspheres is about 60nm.

[0063] 2. Synthesis of magnetic composite microspheres

[0064] Dissolve 1.25g NaOH in 50mL EG, then add the pre...

Embodiment 2

[0075] Adjust the amount of water used in the second step of Example 1 to 20mL, raise the temperature to 210°C, and extend the reaction time to 20h. Other process steps, parameters and operations remain unchanged. The performance and structure of the magnetic beads obtained in the final experiment are similar to those in Example 1.

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Abstract

The invention provides a polystyrene magnetic microsphere and a preparation method thereof. By dispersing linear nanometer polystyrene microspheres into an iron salt solution containing a reducing agent, a self-assembly reaction occurs under high temperature and high pressure conditions, and then an acid Dissolve the magnetic particles on the surface, and then use DVB to modify the surface of the microspheres to obtain a particle size distribution with narrow particle size, good magnetic response, good monodispersity, consistent particle magnetic content, good magnetic particle embedding effect, smooth surface, Polystyrene magnetic microspheres with high sphericity. At the same time, the method has the characteristics of being simple and easy to control, and having good product batch consistency.

Description

technical field [0001] The invention relates to the technical field of composite material preparation, in particular to a preparation method of polystyrene magnetic microspheres. Background technique [0002] Polystyrene magnetic microspheres have many important applications in biological detection and purification. At present, they are mainly prepared by embedding method, dispersion polymerization method, in situ method and other methods. Among them, the embedding method and dispersion polymerization method are to prepare nano-magnetic fluid first and then coat it. The obtained microspheres have a wide particle size distribution, inconsistent magnetic response, and many surface defects. The in-situ method is to prepare polystyrene (PS) microspheres first, absorb iron ions into the interior after swelling, and then react to generate magnetic particles. Although the microspheres prepared by this method have uniform particle diameters, the process is cumbersome and difficult t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/02H01F1/42C08F257/02C08F212/36C08K3/22
CPCB01J13/02C08F257/02C08K3/22C08K2003/2275C08K2201/01H01F1/42C08F212/36
Inventor 王鹏侯立威吴志能胡三元廖添
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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