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Dispersing aid and carbon nanotube dispersion liquid and conductive slurry thereof

A dispersing aid, carbon nanotube technology, applied in the direction of carbon nanotubes, conductive materials dispersed in non-conductive inorganic materials, nanocarbons, etc., can solve the problems of poor dispersion effect, easy agglomeration and precipitation, etc., to improve production. Efficiency, long-lasting adsorption, low viscosity effect

Pending Publication Date: 2021-11-19
SUZHOU HANANO MATERIALS TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to solve the problems of poor dispersion in water, easy agglomeration and precipitation in the prior art when the content of carbon nanotubes is increased. A kind of aqueous carbon nanotube dispersion liquid and preparation method thereof

Method used

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  • Dispersing aid and carbon nanotube dispersion liquid and conductive slurry thereof
  • Dispersing aid and carbon nanotube dispersion liquid and conductive slurry thereof
  • Dispersing aid and carbon nanotube dispersion liquid and conductive slurry thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] The high-solid aqueous carbon nanotube dispersion provided in this example is prepared by the following method:

[0094] (1) Preparation of dispersing aid

[0095] Add 35g of hydroxyl hyperbranched polyester and dissolve it in 300mL of DMF in a four-necked flask with a stirrer, condenser, thermometer and nitrogen inlet, heat to make it dissolve completely, and add a certain amount of ( The molar ratio of acid anhydride to hydroxyl hyperbranched polyester is 7:1) of phthalic anhydride and 0.5g of catalyst N,N-dimethylbenzylamine. After it dissolves, the temperature is raised to 95°C, and the reaction reaches the theoretical acid value (initial Half of the acid value), after steaming off part of the solvent, the reaction temperature was lowered to 50°C, and then the system was neutralized with 30wt% sodium hydroxide aqueous solution to a pH value of 7.0-8.0, and finally a yellow transparent solution with a solid content of 40% was obtained , that is, a solution containin...

Embodiment 2

[0103] The high-solid aqueous carbon nanotube dispersion provided in this example is prepared by the following method:

[0104] (1) Preparation of dispersing aid

[0105] Add 35g hydroxyl hyperbranched polyester and dissolve in 300mL DMF in the four-necked flask that has stirrer, condensation tube, thermometer and nitrogen inlet, heating makes it dissolve completely, under the protection of passing into nitrogen, add a certain amount (acid anhydride The molar ratio of dodecenyl succinic anhydride and trimellitic anhydride to the hydroxyl hyperbranched polyester is 5:1) (the molar ratio of dodecenyl succinic anhydride and trimellitic anhydride is 1:2) and 0.8 g catalyst N,N-dimethylbenzylamine, after it dissolves, heat up to 110°C, react to the theoretical acid value (half of the initial acid value), evaporate part of the solvent and lower the reaction temperature to 50°C, then use 30wt% Aqueous sodium hydroxide solution neutralizes the reactant solution to a pH value of 7.0-8...

Embodiment 3

[0115] This example provides water-based carbon nanotube conductive paste, which is prepared by the following method:

[0116] The water-based carbon nanotube dispersion liquid 66.5g that embodiment 2 makes, 14g water-based polyurethane resin (30% solid content) are mixed, disperse 30 minutes at a high speed with 600rpm in the high-speed disperser, then add the fluid that total mass is 1.2g Leveling agent and anti-settling agent (the mass ratio of leveling agent and anti-settling agent is 2.5:1), mechanically stirred at 300rpm for 10 minutes, and the final product water-based carbon nanotube conductive paste was obtained after standing for defoaming.

[0117] The water-based carbon nanotube conductive paste is coated into a sample film of 20 cm × 30 cm by scrape coating process, and the surface of the sample film is observed. The surface is uniform and there is no obvious shrinkage cavity. The film thickness measured by the height gauge is 10+ / - 1 micron, measured with a squar...

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Abstract

The invention relates to a dispersing aid and a carbon nanotube dispersion liquid and conductive paste thereof, the dispersing aid is hyperbranched polyester with hydroxyl and carboxyl, the dispersion liquid containing the dispersing aid further comprises carbon nanotubes, a dispersing agent and water, and the dispersing agent is a copolymer containing pigment affinity groups. According to the dispersing liquid, the copolymer containing the pigment affinity group is adopted as a dispersing agent, and meanwhile, the hyperbranched polyester with the specific hyperbranched structure is adopted as a dispersing auxiliary agent, so that on one hand, the hyperbranched polyester with the specific hyperbranched structure is easily adsorbed on the surface of the carbon nano tube, and on the other hand, the hyperbranched polyester has hydrophilic groups with certain hydroxyl groups and carboxyl groups, and has a synergistic effect with the dispersing agent, so that when the content of the carbon nanotubes is increased, the carbon nanotubes can still be stably and uniformly dispersed in water for a long time without generating agglomeration and precipitation.

Description

technical field [0001] The invention relates to the technical field of carbon material dispersion, in particular to a dispersion aid and its carbon nanotube dispersion liquid and conductive paste. Background technique [0002] CNTs is a seamless hollow nano-scale coaxial cylindrical tubular material composed of single-layer or multi-layer graphite sheets curled or nested, and can be divided into single-walled carbon nanotubes (SWCNTs) and multi-walled carbon nanotubes according to the number of layers. Tubes (MWCNTs). The carbon atoms on the side walls of CNTs mainly form highly delocalized π electrons with adjacent carbon atoms in the form of sp2 hybridization, resulting in strong van der Waals forces between CNTs, which aggregate into bundles and are not easy to disperse, thus restricting the CNTs. application. At the same time, compared with low-concentration carbon tubes, high-concentration carbon tubes have great advantages in transportation, use and other operations....

Claims

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Application Information

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IPC IPC(8): C01B32/174H01B1/20
CPCC01B32/174H01B1/20C01B2202/36C01B2202/34C01B2202/28C01B2202/22
Inventor 陈新江张伟强刘琪高袁芳
Owner SUZHOU HANANO MATERIALS TECH LTD
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