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Preparation method of highly hydrophobic carbon fluoride nanotube/polyimide composite material

A technology of fluorinated carbon nanotubes and hydrofluorocarbons is applied in the field of preparation of polyimide composite materials, which can solve problems such as limitations and achieve the effects of improving hydrophobic properties and improving mechanics

Active Publication Date: 2016-10-12
大同共聚西安科技有限公司
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Problems solved by technology

[0004] The purpose of the present invention is to further reduce the dielectric constant of pure polyimide, improve its electrical insulation and mechanical properties, solve the problem that its application in special fields is limited, and provide a highly hydrophobic fluorinated carbon nanotube / polyimide Preparation method of imide composite material

Method used

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  • Preparation method of highly hydrophobic carbon fluoride nanotube/polyimide composite material
  • Preparation method of highly hydrophobic carbon fluoride nanotube/polyimide composite material
  • Preparation method of highly hydrophobic carbon fluoride nanotube/polyimide composite material

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specific Embodiment approach 1

[0040] Embodiment 1: This embodiment is a preparation method of a highly hydrophobic fluorinated carbon nanotube / polyimide composite material, which is completed in the following steps:

[0041] 1. Preparation of fluorinated carbon nanotubes:

[0042] ①, the multi-walled carbon nanotubes are placed in an airtight container;

[0043] ②. Vacuumize the airtight container until the pressure in the airtight container drops below 1Pa; then inject argon into the airtight container until the pressure in the airtight container rises to 10 5 Pa;

[0044] ③. Repeat step 1 ② 3 to 5 times;

[0045] ④. Put the mixed gas of argon and fluorine into the airtight container until the pressure in the airtight container rises to 0.5atm~1atm. The heating rate is raised from room temperature to 150°C to 300°C, and then kept at a pressure of 0.5atm to 1atm and a temperature of 150°C to 300°C for 1h to 3h to obtain fluorinated carbon nanotubes;

[0046] The ratio of argon and fluorine in the mixed...

specific Embodiment approach 2

[0069] Specific embodiment two: the difference between this embodiment and specific embodiment one is: in step 1.4, pass the mixed gas of argon and fluorine gas into the airtight container until the pressure in the airtight container rises to 1 atm, and then the pressure is The temperature was raised from room temperature to 250° C. at a rate of 4° C. / min at 1 atm, and then kept at a pressure of 1 atm and a temperature of 250° C. for 2 hours to obtain fluorinated carbon nanotubes. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0070] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: in step 2 ①, the fluorinated carbon nanotubes obtained in step 1 are added in dimethylacetamide, and then the stirring speed is Stirring and reacting at 100 r / min for 2 hours, and then sonicating at an ultrasonic power of 300 W for 12 hours to obtain a dispersion of fluorinated carbon nanotubes with a mass fraction of 0.5% of fluorinated carbon nanotubes. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a preparation method of a highly hydrophobic carbon fluoride nanotube / polyimide composite material, relates to the preparation method of the polyimide composite material, and aims to reduce high dielectric constant of pure polyimide, improve the mechanical properties, reduce the hygroscopicity in engineering application, improve the service life, and solve the problem that special application in electrical insulation and power electronics is limited. The method comprises the steps: firstly, preparing carbon fluoride nanotubes; and secondly, obtaining the highly hydrophobic carbon fluoride nanotube / polyimide composite material through an in-situ polymerization method. The highly hydrophobic carbon fluoride nanotube / polyimide composite material disclosed by the invention can be industrialized in amplification, has great potential application prospects in electrical insulation, power electronics and other fields in future, and has great significance to new application prospects of polyimide. The preparation method of the highly hydrophobic carbon fluoride nanotube / polyimide composite material can be obtained.

Description

technical field [0001] The invention relates to a preparation method of a polyimide composite material. Background technique [0002] Because of its unique electrical properties, excellent mechanical properties, good chemical and thermal stability, and light weight, carbon nanotubes are ideal reinforcements for composite materials. The preparation of polymer / carbon nanotube composites has become a research topic for composite materials. hotspots. However, carbon nanotubes are easy to aggregate into bundles and have low dispersion in common organic solvents, which restricts their application fields. In addition, carbon nanotubes have excellent electrical conductivity. When they are added to polymers as fillers, the electrical conductivity can be greatly improved by adding a small amount, but the composite material after the insulation performance is greatly deteriorated cannot be applied in the field of electrical insulation. The fluorinated carbon nanotubes obtained by flu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/10C08K9/02C08K7/24C08J5/18
CPCC08G73/105C08G73/1071C08J5/18C08J2379/08C08K7/24C08K9/02
Inventor 刘晓旭张增凤孙晓楠
Owner 大同共聚西安科技有限公司
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