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Preparation method of hollow polyimide composite microspheres

A technology of composite microspheres and polyimides, which is applied in the preparation of microspheres and microcapsule preparations, can solve the problems of large consumption of solvents, difficulty in removing thermal surfactants, and easy damage to internal structures by solvents, so as to avoid Effects of thermal properties and easy morphology

Active Publication Date: 2014-11-05
HEILONGJIANG HEIKE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The present invention aims to solve the problem that the existing method for preparing polyimide composite microspheres consumes a large amount of solvent, the shape of the microspheres is difficult to control, the solvent is easy to damage the internal structure of the part, and the problem introduced in the preparation process to avoid reducing the thermal performance of the material The problem that the surfactant is difficult to remove provides a method for preparing polyimide composite microspheres with a hollow structure

Method used

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  • Preparation method of hollow polyimide composite microspheres
  • Preparation method of hollow polyimide composite microspheres
  • Preparation method of hollow polyimide composite microspheres

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specific Embodiment approach 1

[0024] Specific embodiment one: the preparation method of the polyimide composite microsphere of a kind of hollow structure described in the present embodiment is to carry out according to the following steps:

[0025] 1. Mix the polystyrene microsphere solution and the pyrrole monomer under the condition of magnetic stirring, then add ferric chloride, and stir magnetically for 8h to 12h to obtain the polypyrrole-coated polystyrene composite microsphere solution, which will be obtained The solution of polypyrrole-coated polystyrene composite microspheres is subjected to centrifugation, and after centrifugation, the solid is washed with ethanol for 2 to 4 times and then dried to obtain polypyrrole-coated polystyrene composite microspheres; the polystyrene microspheres The solid content is 5%; The volume ratio of described polystyrene microsphere solution and pyrrole monomer is 1:(0.1~0.5); The volume ratio of the quality of described iron trichloride and polystyrene microsphere ...

specific Embodiment approach 2

[0036] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the volume ratio of polystyrene microspheres and pyrrole monomers in step 1 is 1:0.125. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0037] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the volume ratio of polystyrene microspheres and pyrrole monomers in step one is 1:0.2. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a preparation method of hollow polyimide composite microspheres, relates to a preparation method of the polyimide composite microspheres, and solves the problems that according to preparation methods of the polyimide composite microsphere in the prior art, solvent consumption is large, the microsphere morphology is difficult to control, part of the internal structure is easy to be damaged by a solvent, and a surfactant introduced into the preparation process for avoiding of reduction of the thermal properties of materials is difficult to remove. The preparation method is as follows: 1, coating; 2, preparation of a polyamide acid solution; 3, preparation of polyamide acid composite microspheres; and 4, the preparation of the polyimide composite microspheres. The preparation method can well control the composite microsphere morphology, can avoid the polyimide shell collapse phenomenon, and enables the polyimide composite microspheres to have a hollow structure so as to reduce the dielectric constant characteristics. The hollow polyimide composite microspheres are suitable for high temperature resistant and low dielectric materials, wave absorbing material and catalyst carriers and other aspects.

Description

technical field [0001] The invention relates to a preparation method of polyimide composite microspheres. Background technique [0002] With the gradual development of nanoscience, many people focus their research on micro-scale structures. In fact, materials composed of micro-sized, ultra-fine powders hold great potential for functionality. Hollow microspheres have good application prospects in catalysis and functional materials because of their excellent characteristics such as low density and high specific surface area. [0003] The preparation of polyimide into micro-nano spheres will help to increase the specific surface area of ​​polyimide materials, increase its dispersibility in common organic solvents and even in water, and help reduce the processing difficulty of polyimide materials. At the same time, various specific micro-nano morphologies will endow this traditional special engineering plastic with broader application prospects. Based on the above reasons, po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/10C08G73/06B01J13/02
Inventor 方雪苏桂明姜海健马宇良陈明月姚立明张晓臣
Owner HEILONGJIANG HEIKE TECH CO LTD
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