Low-percolation polyester/carbon nanotube conductive composite material and preparation method thereof

A technology of conductive composite materials and carbon nanotubes, applied in the direction of conductive materials dispersed in non-conductive inorganic materials, etc., can solve the problems of application limitations, large amount of carbon nanotubes added, carbon nanotubes not reaching ideal dispersion, etc., to achieve The effect of reducing the percolation value and uniform dispersion height

Inactive Publication Date: 2012-07-04
GUANGXI LISHENG STONE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the experimental results obtained above are gratifying, there are still two problems after all: one is that when the addition amount is small, although the conductivity is improved, it is still far from being able to be used in the field of conduction; the other is that when the conductivity of the composite material is ideal The amount of carbon nanotubes added is relatively large, which greatly limits the application of expensive carbon nanotubes. Of course, such a large amount of added carbon nanotubes is far from ideal dispersion.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Surface polymerization of carbon nanotubes: Weigh and carefully dry 1 part of carboxylated single-walled carbon nanotubes (carboxyl content is 0.73wt%, diameter 2-10nm, length 0.5-10μm) is placed in a flask, add 300 parts of two Place thionyl chloride in a flask equipped with a reflux condenser. After ultrasonic dispersion for 1 hour, control the reaction temperature at 80°C and magnetically stir for 24 hours to obtain 0.9 parts of acyl chloride carbon nanotubes. Remove the remaining thionyl chloride and wash with anhydrous toluene Washing with solvent for 3 times, adding 50 parts of 40 wt% polyethylene glycol (molecular weight: 1000) toluene solution, controlling the reaction temperature to 90° C. and magnetic stirring for 24 hours to obtain 11 parts of PEGylated carbon nanotubes;

[0031] (2) Add 78 parts of dimethyl terephthalate, 50 parts of ethylene glycol and 0.0078 parts of n-tetrabutyl titanate into a 250ml three-necked flask equipped with mechanical stirring...

Embodiment 2

[0034] (1) Surface polymerization of carbon nanotubes: take and carefully dry 1 part of carboxylated double-walled carbon nanotubes (carboxyl content is 1.86wt%, diameter 10-20nm, length 10-30μm) is placed in a flask, add 100 parts of two Place thionyl chloride in a flask equipped with a reflux condenser. After ultrasonic dispersion for 2 hours, control the reaction temperature at 85°C and magnetically stir for 48 hours to obtain 0.9 parts of acyl chloride carbon nanotubes. Remove the remaining thionyl chloride and wash with anhydrous N , washed 4 times with N-dimethylformamide solvent, added 100 parts of 40wt% polyethylene glycol (molecular weight 4000) toluene solution, controlled the reaction temperature to 140 °C and magnetically stirred for 36 hours to obtain 2.1 parts of PEGylated carbon nanotubes ;

[0035] (2) 78 parts of dimethyl terephthalate, 55 parts of ethylene glycol and 0.075 part of antimony trioxide were added to a 250ml three-necked flask equipped with mechan...

Embodiment 3

[0038] (1) Surface polymerization of carbon nanotubes: take 5 parts of carboxylated multi-walled carbon nanotubes (carboxyl content is 3.24wt%, diameter 30-50nm, length 20-30 μ m) and place them in a flask carefully dried, add 250 parts of two Place thionyl chloride in a flask equipped with a reflux condenser. After ultrasonic dispersion for 3 hours, control the reaction temperature at 100°C and magnetically stir for 48 hours to obtain 4.8 parts of acyl chloride carbon nanotubes. Remove the remaining thionyl chloride and wash with anhydrous N , washed 5 times with N-dimethylacetamide solvent, added 300 parts of 40wt% polyethylene glycol (molecular weight 10,000) toluene solution, controlled the reaction temperature to 140° C. and magnetically stirred for 60 hours to obtain 7 parts of PEGylated carbon nanotubes ;

[0039] (2) 78 parts of dimethyl terephthalate, 60 parts of ethylene glycol and 0.045 parts of K 2 TiF 6 Add a 250ml three-necked flask equipped with mechanical sti...

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Abstract

The invention belongs to the technical field of preparation of high molecular materials, and particularly relates to a low-percolation polyester/carbon nanotube conductive composite material and a preparation method thereof. The composite material comprises the following components in parts by weight: 0.05-5 parts of modified carbon nanotube, 78 parts of dimethyl terephthalate, 50-100 parts of aliphatic diol, 0.0078-0.78 part of ester exchange catalyst and 0.0078-0.78 part of polymerization catalyst. The invention also provides a preparation method of the low-percolation polyester/carbon nanotube conductive composite material. The method comprises the following two core steps: surface polymerization of carbon nanotubes and in-situ polymerization. Compared with the prior art, the specially modified carbon nanotubes in the polyester/carbon nanotube conductive composite material provided by the invention have high similarity with polyester, and thus, can be chemically combined with the polyester, and the system viscosity is very low in the in-situ polymerization process, so that the carbon nanotubes are highly dispersed in the substrate, thereby greatly lowing the conductive percolation value of the carbon nanotubes in the composite material.

Description

technical field [0001] The invention belongs to the technical field of polymer material preparation, and in particular relates to a low percolation polyester / carbon nanotube conductive composite material and a preparation method thereof. Background technique [0002] Electronics, electrical appliances, and automatic control fields have increasingly high requirements for conductive and thermally conductive materials. Although metals such as silver, copper, and aluminum have good electrical and thermal conductivity, their application range is severely limited due to their large specific gravity and high price. . Polymers have the advantages of low specific gravity and easy processing, but their volume resistivity is generally 10 10 ~10 20 Between Ω / cm, it has been used as an insulating material for a long time. Although there are a few conjugated polymers, such as polyacetylene, which have a qualitative leap in electrical conductivity compared with traditional polymers, thei...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/02C08K9/04C08K7/00C08K3/04C08G63/183H01B1/24
Inventor 陈珍明
Owner GUANGXI LISHENG STONE CO LTD
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