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Preparation method of electromagnetic composite hollow microspheres

An electromagnetic composite, hollow microsphere technology, applied in the preparation of microspheres, microcapsule preparations, magnetic properties of inorganic materials, etc., can solve the problems of easy falling off of magnetic particles, high density, poor conductivity, etc.

Inactive Publication Date: 2013-06-19
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing electromagnetic composite hollow microspheres in order to solve the problems of poor electrical conductivity, high density and easy falling off of magnetic particles in existing composite hollow materials

Method used

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  • Preparation method of electromagnetic composite hollow microspheres
  • Preparation method of electromagnetic composite hollow microspheres
  • Preparation method of electromagnetic composite hollow microspheres

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specific Embodiment approach 1

[0019] Specific implementation mode one: the preparation method of the electromagnetic composite hollow microspheres of this embodiment is implemented according to the following steps:

[0020] 1. Add 0.4-0.8g of AIBN (azobisisobutyronitrile), 63-127g of ethanol with a mass concentration of 95%, 3.3-6.7g of distilled water and 1.0-2.0g of PVP (polyvinylpyrrolidone) In the reactor, after stirring evenly, add 13.3-26.7g of St (styrene), disperse evenly, and react at a reaction temperature of 70-75°C, a stirring speed of 90-110r / min, and nitrogen protection for 10-14h. Get PS (polystyrene) microspheres;

[0021] 2. Disperse the PS (polystyrene) microspheres obtained in step 1 in sulfuric acid with a mass concentration of 98%, sulfonate at 35-50°C for 1-4 hours, then wash with ethanol for 2-4 times, and then wash with water After centrifugation, the pH of the supernatant was 6, and freeze-dried to obtain SPS microspheres with sulfonic acid groups on the surface;

[0022] Three, ...

specific Embodiment approach 2

[0028] Embodiment 2: This embodiment differs from Embodiment 1 in that 2 g of PS (polystyrene) microspheres in Step 2 are dispersed in 40 ml of sulfuric acid with a mass concentration of 98%. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0029]Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the molar ratio of step three is 1.5:1 FeCl 3 ·6H 2 O and FeCl 2 4H 2 O was dissolved in distilled water. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention provides a preparation method of electromagnetic composite hollow microspheres, relates to a preparation method of a composite hollow material and aims to solve the problems of poor conductivity, high density and high falling possibility of magnetic particles of the existing composite hollow material. The preparation method comprises the following steps: 1, preparing polystyrene microspheres; 2, dispersing the polystyrene microspheres in concentrated sulfuric acid, and sulfonating; 3, preparing a magnetic Fe3O4 nano particle suspension; 4, adding the sulfonic-group-containing SPS microspheres and the Fe3O4 nano particle suspension into a water solution; 5, adding ethanol and ammonia water, and dropwisely adding ethyl orthosilicate; 6, adding into a PVP-containing ethanol solution, and stirring; and 7, mixing an aniline solution with the PVP modified magnetic microspheres, dropwisely adding ammonium persulfate, drying, adding N,N-dimethylformamide, and soaking. For the prepared hollow microspheres, the conductivity is 0.01-1.0 S / cm, the density is low, and the magnetic particles are less prone to fall; and the hollow microspheres are mainly used in the fields of light-weight electromagnetic materials, photonic crystals, wave-absorbing materials and the like.

Description

technical field [0001] The invention relates to a preparation method of a composite hollow material. Background technique [0002] Hollow microspheres have potential application prospects in the fields of catalysis, drug delivery, artificial cells, lightweight fillers, insulating materials, low dielectric constant materials, and photonic crystals, and have attracted widespread attention. [0003] At present, there are many methods for preparing hollow microspheres ranging from nanometer to micrometer. The existing preparation methods mainly include emulsion method, spray drying method, template method and template-free method. Among them, the template method, especially the core-shell template method, has attracted extensive research interest from scholars. The key step in the preparation of this structure by the core-shell template method involves coating or reacting on the surface of a particle to form a shell of another substance. Its composition is adjustable and can be ...

Claims

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Application Information

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IPC IPC(8): B01J13/02C08F112/08C08F8/36C08G73/02H01F1/11
Inventor 徐慧芳韦华伟宋飞井晶徐云鹤黄玉东
Owner HARBIN INST OF TECH
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