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Preparation method of carbon nanotube-polyvinyl alcohol gel microspheres

A polyvinyl alcohol gel and carbon nanotube technology, which is applied in the direction of microsphere preparation, gel preparation, microcapsule preparation, etc., can solve the problems of easy secondary agglomeration and poor dispersion of carbon nanotubes, and achieve short preparation process and Maintain structural integrity and good dispersion effect

Active Publication Date: 2022-05-20
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of poor dispersion of carbon nanotubes, easy secondary agglomeration and compounding with polymer materials, the invention provides a preparation method of carbon nanotube-polyvinyl alcohol gel microspheres

Method used

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  • Preparation method of carbon nanotube-polyvinyl alcohol gel microspheres
  • Preparation method of carbon nanotube-polyvinyl alcohol gel microspheres
  • Preparation method of carbon nanotube-polyvinyl alcohol gel microspheres

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Add 0.5 g of PVA to 49.5 g of water, raise the temperature to 90° C. and keep it warm for 1.5 h, and wait for it to dissolve to form a polyvinyl alcohol aqueous solution with a concentration of 1.0 wt.%. After cooling, add 0.5g of carbon nanotubes for ultrasonic dispersion to form dispersion 1; add 3g of PVA to 47g of water, heat up to 90°C for 2 hours, and wait for it to dissolve to form dispersion 2. The concentration of dispersion 1 and dispersion 2 The ratio is 1:6; the above two dispersion liquids are mixed, and magnetically stirred for 30 min to form a dispersed phase liquid of carbon nanotubes.

[0031] (2) Add 1.5mL of surfactant Sapn-80 into 48.5mL of liquid paraffin, ultrasonically oscillate to completely dissolve Span-80 in the liquid, and obtain a continuous phase liquid with a volume fraction of surfactant of 3%.

[0032] (3) Add 1.5g of borax to a mixture of 50mL of isoamyl alcohol and 25mL of triethanolamine, magnetically stir and slowly heat to 60°C ...

Embodiment 2

[0035] (1) Add 0.25g of PVA to 49.75g of water, raise the temperature to 80°C and keep it warm for 1h, and wait for it to dissolve to form an aqueous solution of polyvinyl alcohol with a concentration of 0.5wt.%. After cooling, add 0.4g of carbon nanotubes for ultrasonic dispersion to form dispersion 1; add 3.5g of PVA to 71.5g of water, raise the temperature to 90°C for 2 hours, and wait for it to dissolve to form dispersion 2. The difference between dispersion 1 and dispersion 2 The concentration ratio is 1:9.3; the above two dispersion liquids are mixed and magnetically stirred for 30 min to form a dispersed phase liquid of carbon nanotubes.

[0036] (2) Add 2mL of surfactant Sapn-80 into 48mL of silicone oil and oscillate ultrasonically to completely dissolve Span-80 in the liquid to obtain a continuous phase liquid with a volume fraction of 4% surfactant.

[0037] (3) Add 1.5g of borax to a mixture of 30mL of hexanol and 15mL of diethanolamine, magnetically stir and slowl...

Embodiment 3

[0040] (1) Add 1.0 g of PVA to 49 g of water, raise the temperature to 90° C. for 2 hours, and wait for it to dissolve to form an aqueous solution of polyvinyl alcohol with a concentration of 2.0 wt.%. After cooling, add 0.5g of carbon nanotubes for ultrasonic dispersion to form dispersion 1; add 6g of PVA to 44g of water, heat up to 90°C for 2 hours, and wait for it to dissolve to form dispersion 2. The concentration of dispersion 1 and dispersion 2 The ratio is 1:6; the above two dispersion liquids are mixed, and magnetically stirred for 30 min to form a dispersed phase liquid of carbon nanotubes.

[0041] (2) Add 2.5mL of surfactant Sapn-80 into 47.5mL of liquid paraffin, ultrasonically oscillate to completely dissolve Span-80 in the liquid, and obtain a continuous phase liquid with a volume fraction of 5% surfactant.

[0042] (3) Add 1.5g of borax to a mixture of 20mL of isooctyl alcohol and 10mL of triethanolamine, magnetically stir and slowly heat to 60°C to dissolve, and ...

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Abstract

The invention discloses a preparation method of carbon nanotube-polyvinyl alcohol gel microspheres. The method first disperses carbon nanotubes in low-concentration and high-concentration polyvinyl alcohol aqueous solutions to form a dispersed phase solution of carbon nanotubes, and the surfactant Span-80 is added to the oil phase to prepare a continuous phase solution. The solution formed by adding the compound to the mixture of alcohol and aminoalcohol is the receiving solution. Using the microfluidic method, the formed droplets naturally drop into the receiving solution, and solidify to obtain carbon nanotube-polyvinyl alcohol gel microspheres. The invention can make the carbon nanotubes uniformly and stably dispersed while maintaining the structural integrity of the carbon nanotubes, the prepared microspheres have a uniform particle size, the shape can be kept complete and smooth, and the preparation process is simple.

Description

technical field [0001] The invention belongs to the technical field of conductive material preparation, and relates to a preparation method of carbon nanotube-polyvinyl alcohol gel microspheres. Background technique [0002] Carbon nanotubes have super strong mechanical properties, extremely high aspect ratio and unique electrical conductivity, and show good application prospects in many fields such as electrode materials, nanoelectronic materials, and structural materials. However, due to the strong van der Waals force between carbon nanotubes, they are easily entangled or form agglomerates, thereby restricting the application of carbon nanotubes. In order to disperse carbon nanotubes better, some physical and chemical methods are often used for treatment. Commonly used physical methods mainly include high-energy ball milling, mechanical stirring, ultrasonic vibration, etc., while chemical methods mainly use strong acid and strong alkali activation, surfactant or covalent ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J13/00B01J13/14
CPCB01J13/0056B01J13/0065B01J13/14Y02E60/10
Inventor 张伟鲍立荣陈永义沈瑞琪叶迎华朱朋
Owner NANJING UNIV OF SCI & TECH
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