Process for preparing magnetic polymethyl methacrylate microsphere by two-step method

A technology of polymethyl methacrylate and methyl methacrylate, applied in the field of magnetic polymethyl methacrylate microspheres, can solve the problems of wide particle size distribution, difficult control of polymerization conditions, uneven distribution of magnetic content, and the like, Achieve narrow particle size distribution, eliminate thermal expansion coefficient mismatch, and uniform particle size

Inactive Publication Date: 2006-12-06
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The object of the present invention is to provide a two-step method to prepare magnetic polymethorone The method of methyl methacrylate microspheres first synthesizes methyl methacrylate microspheres in the first stage to control the particle size and purity of the microspheres; then in the second stage of polymerization, the Fe 3 o 4 Iron powder is embedded in polymethyl methacrylate microspheres to obtain magnetic polymethyl methacrylate microspheres, and a kind of suitable particle size, good monodispersity, high magnetic response and good mechanical stability are obtained. Magnetic polymethyl methacrylate microspheres with excellent comprehensive performance and acid resistance

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  • Process for preparing magnetic polymethyl methacrylate microsphere by two-step method

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Embodiment 1

[0034] Two-step method of the present invention prepares the method for magnetic polymethyl methacrylate microsphere to comprise the steps:

[0035] The first step, preparing polymethyl methacrylate microspheres, including

[0036] (1) dispersant is dissolved in distilled water; Described dispersant is magnesium hydroxide, and the mass ratio with water is 1: 100;

[0037] (2) add initiator in methyl methacrylate, and make initiator dissolve completely; Described initiator is dibenzoyl peroxide, and the mass ratio with methyl methacrylate is 2: 100;

[0038] (3) the solution that step (1) is obtained is heated with stirring, and logical nitrogen 30min gets rid of the oxygen in the container, when temperature reaches 75 ℃, adding consumption is the concentrated sulfuric acid of 0.1% quality of described solution, then adds step (2) ) the solution that obtains, its consumption and the solution equivalence that step (1) obtains;

[0039] (4) After reacting at 60° C. for 2 hours,...

Embodiment 2

[0048] Two-step method of the present invention prepares the method for magnetic polymethyl methacrylate microsphere to comprise the steps:

[0049] The first step is to prepare polymethyl methacrylate microspheres, including

[0050] (1) Dispersant is dissolved in distilled water; Described dispersant is calcium phosphate, and the mass ratio with water is 3: 100;

[0051] (2) add initiator in methyl methacrylate, and make initiator dissolve completely; Described initiator is azobisisobutyronitrile, and the mass ratio with methyl methacrylate is 1: 100;

[0052] (3) the solution that step (1) is obtained is heated with stirring, and logical nitrogen 90min gets rid of the oxygen in the container, when temperature reaches 60 ℃, adding consumption is the concentrated sulfuric acid of 0.3% quality of described solution, then adds step (2) ) the solution that obtains, its consumption and the solution equivalence that step (1) obtains;

[0053] (4) After reacting at 90° C. for 2.5...

Embodiment 3

[0062] Two-step method of the present invention prepares the method for magnetic polymethyl methacrylate microsphere to comprise the steps:

[0063] The first step: prepare polymethyl methacrylate microspheres, including

[0064] (1) dispersant is dissolved in distilled water; Described dispersant is calcium phosphate and barium sulfate, and its mass ratio is 80: 20, and the mass ratio of dispersant and water is 2: 100;

[0065] (2) add initiator in methyl methacrylate, and make initiator dissolve completely; Described initiator is dibenzoyl peroxide, and the mass ratio with methyl methacrylate is 3: 100;

[0066] (3) the solution that step (1) is obtained is heated with stirring, and logical nitrogen 65min gets rid of the oxygen in the container, when temperature reaches 95 ℃, adding consumption is the concentrated sulfuric acid of 0.15% quality of described solution, then adds step (2) ) the solution that obtains, its consumption and the solution equivalence that step (1) o...

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Abstract

The invention relates to a method for manufacturing magnetic polymethyl methacryate microsphere, which comprises two steps: first, preparing polymethyl methacryate microsphere; second, preparing magnetic polymethyl methacryate microsphere. Compared with existing technology of one step, the invention divides process into two steps. The first step controls particle size and purity of microsphere, while the second step embeds ferrous powder into polymethyl methacryate microsphere. The invention can get magnetic polymethyl methacryate microsphere with adaptive particle size, good monodisperse, mechanic stability and so on.

Description

technical field [0001] The invention relates to magnetic materials, biomedicine (clinical diagnosis, targeted drug, enzyme label), cytology (cell labeling, cell separation, etc.), bioengineering (enzyme immobilization), separation engineering and stealth technology, etc. A two-step method for preparing magnetic polymethyl methacrylate microspheres. Background technique [0002] Magnetic polymer microspheres are microspheres with certain magnetic properties and special structures that combine organic polymers and inorganic magnetic substances. Because magnetic polymer microspheres have many characteristics and magnetic responsiveness of polymer microspheres at the same time, not only can they be endowed with surface functional groups (such as -OH, -COOH, -CHO, -NH, etc.) 2 , -SH, etc.), but also convenient and rapid separation and orientation under an external magnetic field. [0003] Magnetic polymer microspheres can be divided into three categories according to their stru...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F120/14C08J3/14
Inventor 游长江
Owner SOUTH CHINA UNIV OF TECH
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