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Method for preparing organic/inorganic composite magnetic microcapsules

A technology of inorganic compounding and microcapsules, applied in the directions of microcapsule preparation, microsphere preparation, etc.

Active Publication Date: 2010-10-20
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is no report on the one-step synthesis of magnetic microcapsules with high magnetic content by miniemulsion polymerization

Method used

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  • Method for preparing organic/inorganic composite magnetic microcapsules
  • Method for preparing organic/inorganic composite magnetic microcapsules
  • Method for preparing organic/inorganic composite magnetic microcapsules

Examples

Experimental program
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Embodiment 1

[0029] Embodiment 1: miniemulsion polymerization prepares magnetic microcapsule

[0030] Mix and disperse 5g of ferric oxide and 50g of distilled water, put it into a container equipped with an electric stirrer, a condenser tube and a thermometer, stir and raise the temperature of the system; when the temperature rises to 70°C, add 2g of oleic acid and keep it warm for 40 minutes After pouring out the water, use n-heptane as a dispersant to disperse, and prepare a suspension with a magnetic particle content of 10%; add monomer styrene, Disperbyk-106 and paraffin to the suspension, and then ultrasonically dissolve the The magnetic particles are evenly dispersed in the monomer styrene to form an oil phase, wherein the ratio of monomer styrene: suspension: Disperbyk-106: paraffin wax is 10:2:1.5:0.6; the water phase is 1% Aqueous solution of sodium dodecyl sulfonate; mix the oil phase and water phase according to the mass ratio of 1:5, put them into a container with an electric s...

Embodiment 2

[0031] Embodiment 2: miniemulsion polymerization prepares magnetic microcapsule

[0032] Mix and disperse 5g of ferric oxide and 50g of distilled water, put it into a container equipped with an electric stirrer, a condenser and a thermometer, stir and raise the temperature of the system; when the temperature rises to 80°C, add 3g of oleic acid and keep it warm for 40 minutes ; After pouring out the water, use cyclohexane as a dispersant to disperse, and prepare a suspension with a magnetic particle content of 10%; add monomer styrene, Disperbyk-106 and cetyl alcohol to the above suspension, and then ultrasonicate for 5 Minutes uniformly disperse the magnetic particles in the monomer styrene to prepare the oil phase, wherein the monomer styrene:suspension:Disperbyk-106:hexadecanol mass fraction ratio is 10:2:1.0:0.6; the water phase is the concentration It is an aqueous solution of 1% sodium dodecylbenzene sulfonate; mix the oil phase and the water phase according to the mass r...

Embodiment 3

[0033] Embodiment 3: miniemulsion polymerization prepares magnetic microcapsule

[0034] Mix and disperse 5g of barium ferrite with 50g of distilled water, put it into a container equipped with an electric stirrer, a condenser tube and a thermometer, stir and raise the temperature of the system; when the temperature rises to 80°C, add 4g of oleic acid and keep it warm for 40 minutes ; After pouring out the water, use n-hexane as a dispersant to disperse, and prepare a suspension with a magnetic particle content of 10%; add monomer styrene, Disperbyk-108 and hexadecane to the above suspension, and then ultrasonic for 5 minutes The magnetic particles are uniformly dispersed in the monomer styrene to prepare an oil phase, wherein the monomer styrene:suspension:Disperbyk-108:hexadecane mass fraction ratio is 10:3:1.5:0.6; the water phase has a concentration of 0.5% aqueous solution of sodium dodecyl sulfonate; mix the oil phase and the water phase according to the mass ratio of 1:...

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Abstract

The invention relates to a method for preparing organic / inorganic composite magnetic microcapsules. The method is characterized by preparing highly magnetic microcapsules by taking styrene as a polymer monomer by a mini-emulsion polymerization method in one step, wherein magnetic particles are dispersed in the capsule wall of polystyrene; and the capsule core is made of unsaturated alkane. The particle diameter of the magnetic particles is within the range from 5 to 15nm; the magnetic particles are modified by a modifier (long-chain unsaturated acid) before use; and the submicron-scale magnetic microcapsules of high magnetic content with particle diameter of between 0.5 and 2mu m and the magnetic content of between 6 and 30 percent are prepared by the mini-emulsion polymerization in one step. The method has the advantages of simple and convenient technological operation, high magnetic content of the prepared microcapsules, high magnetic response, small and uniform particle diameter and capability of meeting the operating requirements in more fields.

Description

technical field [0001] The invention relates to a method for preparing organic / inorganic composite magnetic microcapsules, in particular to one-step synthesis of microcapsules rich in magnetic properties by using styrene as a polymer monomer through miniemulsion polymerization, and magnetic particles are dispersed in polymer capsules within the walls. Background technique [0002] Due to their unique properties, magnetic composite microspheres and microcapsules have attracted the attention of scholars from various countries in the fields of biomedicine and biochemistry. The former has many excellent properties such as the multifunctionality of polymers and the magnetic responsiveness of magnetic substances, small particle size, and large surface area. Attractive application prospects; the latter, as an effective carrier or container capable of protection and coating, has broad application space in drug sustained release and delivery, microreactors, sensors and other fields....

Claims

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Application Information

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IPC IPC(8): B01J13/02
Inventor 张和鹏张秋禹张宝亮尹德忠范新龙刘瑜
Owner NORTHWESTERN POLYTECHNICAL UNIV
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