Porous magnetic starch microsphere and preparation method thereof

A technology of starch microspheres and magnetism, applied in the production of bulk chemicals, etc., can solve the problems such as no reports on the research results of porous magnetic starch, poor mechanical strength of magnetic starch microspheres, wide particle size distribution of magnetic particles, etc. Surface tension and capillary forces, prevention of collapse and agglomeration, effects of narrow pore size distribution

Active Publication Date: 2014-04-30
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods are simple and easy to prepare magnetic polymer microspheres, but the magnetic particle size distribution is wide, the shape is irregular, the particle size is not easy to control, the magnetic core coating is not dense enough, easy to leak, and the magnetic content is low. Starch microspheres have disadvantages such as poor mechanical strength, poor spherical structure, and single functional structure, which limit their application range and effect to a certain extent.
[0005] The present invention combines the functional advantages of porous starch and magnetic starch to develop a new porous magnetic starch material. In the current research report, there is no research report on porous magnetic starch.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The preparation method of porous magnetic starch microsphere, it comprises the steps:

[0035] (1) Preparation of starch gelatinization liquid: Dissolve 100 parts of tapioca starch in 800 parts of deoxygenated deionized water at 25°C, adjust pH=12 with sodium bicarbonate, gelatinize and cool to room temperature to obtain starch gelatinization liquid.

[0036] (2) Preparation of starch water phase mixture: use 100 parts of 15% ( w / w ) peroxide benzoic acid solution to soak 10 parts of surface-modified nano-Fe 3 o 4 The magnetic fluid was prepared in 1.5 hours, and the peroxide benzoic acid solution in the magnetic fluid was removed by magnetic separation, and 100 parts of deionized water was added to form a new magnetic fluid, and then mixed with 3 parts of N,N'-methylenebisacrylamide Add it to the starch gelatinization solution and stir it with 500W ultrasonic wave to form a starch-water phase mixture, which is set aside.

[0037] (3) Preparation of oil phase: Disso...

Embodiment 2

[0043] The preparation method of porous magnetic starch microsphere, it comprises the steps:

[0044] (1) Preparation of starch gelatinization liquid: Dissolve 100 parts of tapioca starch in 2000 parts of deoxygenated deionized water at 25°C, adjust pH=12 with sodium bicarbonate, gelatinize and cool to room temperature to obtain starch gelatinization liquid.

[0045] (2) Preparation of starch water phase mixture: use 100 parts of 20% ( w / w ) methyl ethyl ketone peroxide solution soaking 50 parts of surface modified nano-Fe 3 o 4 Prepare the magnetic fluid in 2 hours, remove the methyl ethyl ketone peroxide solution in the magnetic fluid by magnetic separation, add 100 parts of deionized water to form a new magnetic fluid, and then mix it with 4 parts of N,N'-methylenebisacrylamide Add it to the starch gelatinization liquid and stir it with 750W ultrasonic wave to form a starch-water phase mixture, which is set aside.

[0046] (3) Oil phase preparation: Dissolve 50 parts of...

Embodiment 3

[0052] The preparation method of porous magnetic starch microsphere, it comprises the steps:

[0053] (1) Preparation of starch gelatinization liquid: Dissolve 100 parts of tapioca starch in 1200 parts of deoxygenated deionized water at 25°C, adjust pH=13 with sodium bicarbonate, gelatinize and cool to room temperature to obtain starch gelatinization liquid.

[0054] (2) Preparation of starch water phase mixture: use 100 parts of 18% ( w / w ) tert-butyl peroxyisopropyl formate solution soaks 30 parts of surface-modified nano-Fe 3 o 4 The magnetic fluid was prepared in 1 hour, and the tert-butyl peroxyisopropyl formate solution in the magnetic fluid was removed by magnetic separation, and 100 parts of deionized water was added to form a new magnetic fluid, and then mixed with 3 parts of N,N'- Methylenebisacrylamide is mixed and added to the starch gelatinization solution, and then stirred evenly by 750W ultrasonic to form a starch aqueous phase mixture, which is set aside.

...

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Abstract

The invention discloses a porous magnetic starch microsphere and a preparation method thereof. The method is characterized in that organic peroxide-surface modified Fe3O4 magnetic particle is used as a nucleus, mineral oil is used as a continuous phase, starch molecules and the magnetic nucleus are combined through reversed-phase polymerization reaction to form a magnetic starch micro sol particle with a nuclear-shell structure, the starch molecules on a shell layer are subjected to cross-linking reaction under the action of cross-linking agent-epoxy chloropropane, so that the magnetic starch micro sol is gelatinized to obtain magnetic starch micro gel, then the magnetic starch micro gel is subjected to demulsification, washing, magnetic separation, supercritical CO2 extraction and drying to obtain the porous magnetic starch microspheres. The porous magnetic starch microsphere is round, has uniform particle size, narrow pore size distribution, large specific surface and high mechanical strength, and the porous magnetic starch has a magnetic guiding function and a flexible and strong adsorption loading function, and has wide application prospect in the fields of sewage treatment, targeted drugs, catalytic industry, environment monitoring, immobilized enzymes and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of starch deep-processing products, and in particular relates to a method for preparing porous magnetic starch by adopting reverse-phase polymerization combined with sol-gel technology and supercritical drying. Background technique [0002] Starch is a resource-rich, cheap and renewable natural polymer material, which is widely used in industrial fields such as papermaking, food, textile and petroleum. With the development of industrial technology, natural starch can no longer meet the requirements of industrial applications due to its inherent defects. Therefore, adjusting the structure, function and properties of starch with appropriate methods, researching and developing various new starch-based materials, and increasing the added value of starch have received widespread attention. Among them, porous starch and magnetic starch have become one of the hot research projects in recent years. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08J3/24C08F251/00C08F2/44C08K9/00C08K3/22C08L51/02
CPCY02P20/54
Inventor 谢新玲张友全童张法罗冯笑唐爱星陈闯
Owner GUANGXI UNIV
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