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Polyamide porous microspheres and preparation method thereof

A technology of porous microspheres and polyamides, applied in the field of polymer materials, can solve problems such as inability to control, and achieve the effects of easy implementation, narrow size distribution, and simple process

Active Publication Date: 2017-05-17
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although Japanese Patent Laid-Open No. 2008-38037 introduces a method for obtaining nylon 6 porous microspheres at close to room temperature, the particle size of the microspheres is more than ten microns and cannot be regulated

Method used

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  • Polyamide porous microspheres and preparation method thereof
  • Polyamide porous microspheres and preparation method thereof
  • Polyamide porous microspheres and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Add 20g of nylon 6 pellets and 240ml of formic acid into the reaction kettle and heat up to 80°C, stir for 2 hours to fully dissolve the materials, then add 400ml of ethanol solution with a concentration of 10% g / ml polyvinylpyrrolidone (PVP), stir vigorously, and placed, the powder was precipitated. Suction filtration, washing with ethanol, and vacuum drying to obtain polyamide porous microspheres; figure 1 The scanning electron micrographs of the polyamide porous microspheres prepared by this method can be seen from the figure, the average size of the microspheres is 10um, and the surface pore size is uniform. The BET specific surface area of ​​the microspheres measured by the specific surface meter is 35m 2 / g, the maximum pore size is 1um. The particle size distribution coefficient of the microspheres measured by the laser particle size analyzer is 0.91.

Embodiment 2

[0040] Add 28g of nylon 6 pellets and 240ml of formic acid into the reaction kettle and heat up to 80°C, stir for 2 hours to fully dissolve the materials, then add 400ml of ethanol solution with a concentration of 10% g / ml polyvinylpyrrolidone (PVP), stir vigorously and let it stand placed, the powder was precipitated. Suction filtration, washing with ethanol, and vacuum drying to obtain polyamide porous microspheres; figure 2 Scanning electron micrographs of polyamide porous microspheres prepared by this method. It can be seen from the figure that the average size of the microspheres is 20um, and the surface pore size is uniform. The BET specific surface area of ​​the microspheres measured by the specific surface meter is 32m 2 / g, the maximum pore size is 1um. The particle size distribution coefficient of the microspheres measured by the laser particle size analyzer is 0.94.

Embodiment 3

[0042] Add 40g of nylon 6 pellets and 240ml of formic acid into the reaction kettle and heat up to 80°C, stir for 2 hours to fully dissolve the material, then add 400ml of ethanol solution with a concentration of 10% g / ml polyvinylpyrrolidone (PVP), stir vigorously, and placed, and the powder was precipitated. Suction filtration, washing with ethanol, and vacuum drying to obtain polyamide porous microspheres; image 3The scanning electron micrographs of the polyamide porous microspheres prepared by this method can be seen from the figure, the average size of the microspheres is 50um, and the surface pore size is uniform. The BET specific surface area of ​​the microspheres measured by the specific surface meter is 30m 2 / g, the maximum pore size is 2um. The particle size distribution coefficient of the microspheres measured by the laser particle size analyzer is 1.0.

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Abstract

The invention discloses polyamide porous microspheres and a preparation method thereof. The preparation method comprises the preparation steps: heating and dissolving polyamide into a good solvent of the polyamide by a dissolution-precipitation mode; adding a poor solvent of the polyamide, which contains a dispersing agent PVP, and performing precipitation and aftertreatment to obtain the polyamide porous microspheres with high dispersibility. The preparation method does not need high-temperature high-pressure equipment, and the process is simple, convenient, economic, effective, environment-friendly and easy to implement. The used solvents are low in boiling point and insusceptible to remain, and the solvents and the dispersing agent can be recycled. The polyamide porous microspheres prepared with the method is narrow in size distribution, and fine particles with small particle size can be obtained; furthermore, the particle size can be adjusted along with the change of the preparation conditions such as the ratio of the good solvent to the poor solvent and the PVP content.

Description

technical field [0001] The invention relates to the field of polymer materials. More specifically, it relates to a polyamide porous microsphere and a preparation method thereof. Background technique [0002] The special size and interface effect of polyamide porous microspheres make them have broad application prospects in the fields of catalyst supports, adsorption and separation materials, chromatographic column fillers, and cosmetic additives. At present, the preparation method of polyamide (PA) porous microspheres is mainly the precipitation method, that is, the polyamide PA is precipitated from the homogeneous saturated solution by means of programmed cooling or slow solvent volatilization, or by adding to the PA saturated solution A poor solvent was added to precipitate PA. For example: One method involves dissolving polyamide in ethylene glycol by heating and then cooling the solution to produce spherical polyamide particle powder. (Japanese Patent Laid-Open No. 20...

Claims

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Application Information

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IPC IPC(8): C08J3/14C08L77/02
Inventor 王格侠刘平季君晖王萍丽任中来甄志超
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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