Method for preparing nylon composite modified by in-situ polymerization carbon nanotube

A technology of carbon nanotube modification and nylon composite materials, which is applied in the field of modified nylon composite materials, can solve the problems of poor mechanical properties of nylon composite materials, and achieve the effects of avoiding thermal degradation, ensuring nano-characteristics, and maintaining stability

Active Publication Date: 2016-06-15
NANJING UNIV OF TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a preparation method of in-situ polymerized carbon nanotube modified nylon composite material to solve the problem of poor mechanical properties of nylon composite material existing in the prior art

Method used

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  • Method for preparing nylon composite modified by in-situ polymerization carbon nanotube

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preparation example Construction

[0037] (1) Preparation of MWCNTs-COOH

[0038] Sonication with a strong oxidizing mixed acid introduced oxygen-containing groups at the ports or defect sites of MWCNTs. The specific method is: put 100mg MWCNTs in a strong oxidizing mixed acid solution, magnetically stir in a water bath at 60°C, and heat to reflux for 6h. After the reacted solution was centrifuged at 10000r / min for 10min, the supernatant was discarded, and the black solution in the lower layer was repeatedly washed with deionized water and suction filtered until the pH of the filtrate was 7-7.5; then the filter cake was vacuumed at 80°C After drying for 12 hours, the acidified multi-walled carbon nanotubes were obtained, which was recorded as: MWCNTs-COOH.

[0039] (2) MWCNTs-NH 2 preparation of

[0040]Weigh 50 mg of MWNTs-COOH, add it into 50 ml of toluene solution, and stir magnetically in an oil bath at 100 °C for 2 h. Weigh 0.2mL of EDA and toluene to make a 5mL solution, and weigh 1.5g of condensation...

Embodiment 1

[0043] Embodiment 1: Preparation of a kind of in-situ polymerized carbon nanotube modified nylon 56 composite material containing 0.1wt%

[0044] Add 25g of nylon 56 salt into the autoclave, seal it, then vacuumize it, fill it with high-purity nitrogen, and repeat the pumping and ventilation three times to remove the moisture and air in the system, and then start heating to 180°C, that is, nylon 56 salt In a completely molten state, start the stirring device. After reacting for 1 hour, add ammoniated carbon nanotubes into the reaction system, wherein the weight of ammoniated carbon nanotubes is 25 mg; seal again, then vacuumize, fill with high-purity nitrogen, and pump Air exchange was repeated three times to remove moisture and air in the system, and the temperature was raised to 240°C for 4 hours of reaction, and then kept at 240°C for 0.5h in vacuum. In order to prevent nylon 56 from being oxidized at high temperature, antioxidants need to be added, the weight is 0.5g, and ...

Embodiment 2

[0045] Embodiment 2: Preparation of a kind of in-situ polymerized carbon nanotube modified nylon 56 composite material containing 0.5wt%

[0046] Add 25g of nylon 56 salt into the autoclave, seal it, then vacuumize it, fill it with high-purity nitrogen, and repeat the pumping and ventilation three times to remove the moisture and air in the system, and then start heating to 180°C, that is, nylon 56 salt Completely molten state, start the stirring device, react for 1 hour, then add ammoniated carbon nanotubes into the reaction system, wherein the weight of ammoniated carbon nanotubes is 0.132g; seal again, then vacuumize, and fill with high-purity nitrogen, Air pumping and ventilation were repeated three times to remove moisture and air in the system, and the temperature was raised to 250° C. for 4 hours, and then kept at 250° C. for 0.5 hours in vacuum. In order to prevent nylon 56 from being oxidized at high temperature, it is necessary to add an antioxidant with a weight of ...

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Abstract

The invention discloses a method for preparing a nylon composite modified by an in-situ polymerization carbon nanotube.According to the method, an MWCNTs-NH2 is prepared from the carbon nanotube, then a reaction with nylon salt is conducted, and the ammoniation multi-walled carbon nanotube composite is obtained.Compared with the prior art, the friction and wear performance, tensile strength and stability of the prepared composite are all greatly improved.

Description

technical field [0001] The invention belongs to the field of modified nylon composite materials, and in particular relates to a preparation method of in-situ polymerized carbon nanotube modified nylon composite materials. Background technique [0002] Nylon materials have the characteristics of strong polarity, the ability to form hydrogen bonds between molecules, and have certain activity. Due to its excellent mechanical properties, wear resistance, self-lubrication, oil resistance, corrosion resistance and good processing and forming properties, it is widely used in automotive parts, electronic appliances, petrochemical and other industries. The strong polarity of nylon makes it more absorbent and has a greater impact on the dimensional stability of the product. In addition, the disadvantages of poor heat resistance and low low temperature impact strength of nylon limit the application fields of nylon materials. Therefore, people usually improve the overall performance o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/28C08G69/26C08K9/02C08K9/04C08K7/24
CPCC08G69/26C08G69/28C08K7/24C08K9/02C08K9/04C08K2201/011C08K2201/016
Inventor 郭凯王海鑫朱宁胡欣方正弓桦曾文波
Owner NANJING UNIV OF TECH
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