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Carbon nanotube/nylon composite material as well as preparation method and conductive application thereof

A technology of nylon composite materials and carbon nanotubes, which is applied in the field of preparation of carbon nanotube/nylon composite materials, can solve the problems of reduced material conductivity and material impact strength, and achieves reduced resistivity, simple method, and convenient operation Effect

Active Publication Date: 2021-01-26
山东科华赛邦新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the impact strength of the material will decrease significantly after adding carbon nanotubes to nylon. In order to improve the impact toughness of the material, it is often necessary to add polyolefin tougheners
The inventors found that these toughening agents tend to wrap conductive fillers such as carbon nanotubes in nylon materials, and although the impact toughness of nylon materials is improved, the electrical conductivity of the materials will be significantly reduced

Method used

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preparation example Construction

[0022] A preparation method of carbon nanotube / nylon composite material, comprising:

[0023] Using plasma to modify the surface of carbon nanotubes;

[0024] Using a double bond-containing silane coupling agent to graft the surface-modified carbon nanotubes to obtain polar carbon nanotubes with double bond functional groups on the surface;

[0025] The polar carbon nanotubes with double bond functional groups on the surface are melted and mixed with polyolefin toughening agent, nylon and initiator, and then extruded to obtain the product.

[0026] In some embodiments, the amount of polar carbon nanotubes containing double bond functional groups on the surface is 3-4% of nylon, which can reduce the resistivity of nylon materials to 10% 2 ~10 3 Ω / cm, and the material has good impact toughness, and the notched impact strength at room temperature is greater than 20kJ / m 2 .

[0027] In some embodiments, the surface modification conditions are: gas pressure 50-300Pa, discharge ...

Embodiment 1

[0035] A conductive nylon composite material and a preparation method thereof. Nylon 6, carbon nanotubes, toughening agent, coupling agent, initiator, and antioxidant are weighed according to parts by weight, wherein 90.7 parts of nylon 6, 3 parts of carbon nanotubes, 5 parts of toughening agent, coupling agent 0.5 parts of kh5500, 0.3 parts of initiator, and 0.5 parts of antioxidant. First, use low-temperature plasma technology to carry out surface functionalization treatment on carbon nanotubes: place them in a plasma reaction device, pass through oxygen / ammonia gas mixture (volume ratio 50 / 50), under gas pressure 50Pa, discharge power 100W 1. Under the discharge time of 5 minutes, the surface of the carbon nanotubes is functionalized to produce polar groups such as hydroxyl groups, carboxyl groups, and amine groups on the surface. Then the plasma-treated carbon nanotubes were put into a high-speed mixer, a coupling agent was added and mixed for 30 minutes, and then the tem...

Embodiment 2

[0037] The difference from Example 1 is that the nylon is nylon 66.

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Abstract

The invention relates to a carbon nanotube / nylon composite material as well as a preparation method and conductive application thereof, and belongs to the field of polymer conductive composite materials. The preparation method comprises the following steps: performing surface modification on a carbon nanotube by adopting plasma; carrying out grafting treatment on a surface-modified carbon nanotubeby adopting a silane coupling agent containing double bonds to obtain a polar carbon nanotube containing double-bond functional groups on the surface; and melting and mixing the polar carbon nanotubecontaining the double-bond functional group on the surface with a polyolefin toughening agent, nylon and an initiator, and carrying out extrusion molding to obtain the product. The carbon nanotube isanchored on the surface of the polyolefin elastomer, and finally the purpose of limiting the carbon nano tube at the nylon / toughening agent interface is achieved, so that the elastomer does not wrapthe carbon nano tube, and the conductive efficiency of the carbon nano tube is remarkably improved.

Description

technical field [0001] The invention belongs to the field of polymer conductive composite materials, and in particular relates to a preparation method of carbon nanotube / nylon composite materials. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Nylon is a class of engineering plastics with excellent properties. Commonly used nylons include 6 and 66, which have good mechanical properties, heat resistance, wear resistance, chemical solvent resistance, and self-lubricating properties. Due to its poor conductivity, its application in electrical appliances, electronics and other fields is limited. [0004] In order to improve the conductivity of nylon materials, it is often n...

Claims

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Application Information

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IPC IPC(8): C08J5/00C08L77/02C08L77/06C08L23/00C08K9/06C08K9/00C08K3/04
CPCC08J5/005C08J2377/02C08J2377/06C08J2423/00C08K9/06C08K9/00C08K3/041C08K2201/001C08K2201/011
Inventor 王兆波谢永光李晓宇蒋波杨建刘晓梅
Owner 山东科华赛邦新材料股份有限公司
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