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Method for producing magnetic polymer microsphere with coating method

A production method and polymer technology, which are applied in the preparation of magnetic objects, magnetic materials, and microspheres, can solve the problems of low success rate, high reaction conditions, and low production efficiency, and achieve simple production process and good corrosion resistance. , safe to use

Inactive Publication Date: 2008-02-13
BIOCHEM ENG COLLEGE OF BEIJING UNION UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The polymerization method in the above method has the disadvantages of complex preparation method, high requirements for reaction conditions, low content of magnetic substances, and low production efficiency; the particle size of the magnetic microspheres obtained by the blending and embedding method is difficult to control, irregular in shape, and particle-like magnetic inhomogeneity defect
[0008] The preparation of magnetic microspheres by copolymerization method, the preparation of magnetic microspheres by microsuspension method, etc. have the disadvantages of low success rate and difficult preparation.

Method used

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  • Method for producing magnetic polymer microsphere with coating method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The paraffin wax and iron powder (microspheres) crushed to more than 20 meshes are mixed uniformly in a mortar at a mass ratio of 1:1 and then put into the reactor. The melting point of the paraffin wax used is 57°C to 63°C. Water with 3-4 times the weight of paraffin wax and iron powder is heated up to 70°C, and 1% azobisisobutyronitrile relative to the weight of paraffin wax is added, and reacted for 2 hours. After the reaction is completed, the material is cooled, filtered, and dried for later use.

[0032] Put the above-mentioned dried material in toluene solvent, heat to 100°C, stir to dissolve the polymer without cross-linking reaction, then cool down the above mixture and filter it with suction, wash with water or ethanol and filter with suction, wash and suction The filtered material is dried, and after magnetic separation, it becomes polymer-coated magnetic polymer microspheres. The magnetic content of the magnetic polymer microsphere can reach more than 35%. ...

Embodiment 2

[0034]First treat the iron powder (microsphere) with an organosilicon coupling agent of 1% by weight of the iron powder, then mix the paraffin wax crushed to more than 20 meshes with the treated iron powder (microsphere) in a mortar, wherein, The melting point of the paraffin wax used is 57°C to 63°C, the mass ratio of paraffin wax and iron powder is 1:2, after mixing evenly, add 3-4 times the weight of water relative to paraffin wax and iron powder, and 1 % azobisisobutyronitrile, reacted at 70°C for 2 hours, after the reaction was completed, the material was cooled, filtered, and dried for later use.

[0035] Put the above-mentioned dried material in toluene solvent, heat to 100°C, stir to dissolve the polymer without cross-linking reaction, then cool down the above mixture and filter it with suction, wash with water or ethanol and filter with suction, wash and suction The filtered material is dried, and after magnetic separation, it becomes polymer-coated magnetic polymer m...

Embodiment 3

[0037] The reaction process is basically the same as in Example 1, except that the mass ratio of pulverized paraffin wax and iron powder (microspheres) is adjusted to 1: 3 or 1: 4, and the reaction temperature is set at 80° C. for 1 hr, except that Other than that, the weight multiples of the water added relative to the paraffin and iron powder, the percentage weight of the initiator added relative to the paraffin, and the post-treatment process are all the same as in Example 1. The magnetic content of the magnetic polymer microsphere can reach more than 60%.

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Abstract

A magnetic polymer microsphere production method of a coating method includes that firstly a polymer with a low melting point of 50 DEG C to 120 DEG C is smashed to be more than 20 meshes, then the obtained polymer powder is mixed with a magnetic material with granular sizes of 50nm to 10Mum according to a weight proportion of that the magnetic material weight is 1 to 5 times of the polymer weight; secondly under the condition that the used polymer melting point is 0 DEG C to 32 DEG C, an initiator or a curing agent is introduced into a mixture to make the polymer occur a crosslinking reaction; thirdly the material after the crosslinking reaction is put into a toluene, a ethanol or a acetone impregnant and heated to 70 DEG C to 100 DEG C to dissolve the polymer which does not occur the crosslinking reaction, then the said mixture is cooled and filtrated, then the mixture is washed and filtrated, and the material after washing and filtration is dried to be the magnetic polymer microsphere coated by polymer. The polymer microsphere is provided with a three-dimensional net-shaped structure and better corrosion resistance, which can be comparatively safe used inside human body.

Description

technical field [0001] The invention relates to a production method of a coating method magnetic polymer microsphere. It belongs to the technical field of new materials and biomaterials. Background technique [0002] Magnetic polymer microspheres refer to the combination of organic polymer materials (polymer microspheres) and inorganic magnetic substances by appropriate methods to form microspheres with certain magnetic properties and special structures. Because it not only has many characteristics of polymer microspheres, but also has the responsiveness of magnetic materials to magnetism, it has shown strong vitality as a functional material in many fields since the 1970s. [0003] In particular, monodisperse, micron-scale functional polymer microspheres have specific properties such as large specific surface area, strong adsorption, strong agglutination, and surface responsiveness, which lays the foundation for their further applications. For example, magnetic polymer pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J13/02B01J13/14C08F2/44H01F1/00
Inventor 马榴强程艳玲李若慧
Owner BIOCHEM ENG COLLEGE OF BEIJING UNION UNIV