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Method for improving volume resistivity of carbon fiber, modified carbon fiber and application of modified carbon fiber

A technology of volume resistivity and carbon fiber, which is applied in the field of modifying carbon fiber and improving the volume resistivity of carbon fiber, which can solve the problems of difficult insulating materials, high dielectric constant, and low packing density, so as to reduce the dielectric constant and improve the insulation performance , The effect of increasing the volume resistivity

Inactive Publication Date: 2019-06-14
SHENZHEN HALCYON NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The modified carbon fiber has the characteristics of good dispersion and low bulk density, and can partially shield and interfere with electromagnetic waves and wireless signals, achieving the role of gaining an advantage in information competition, but it has a higher dielectric constant and a lower resistance rate, it is difficult to use insulating materials

Method used

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  • Method for improving volume resistivity of carbon fiber, modified carbon fiber and application of modified carbon fiber
  • Method for improving volume resistivity of carbon fiber, modified carbon fiber and application of modified carbon fiber
  • Method for improving volume resistivity of carbon fiber, modified carbon fiber and application of modified carbon fiber

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Embodiment 1

[0059] This embodiment provides a method for increasing the volume resistivity of carbon fibers, the steps are as follows:

[0060] (1) Preoxidation

[0061] Prepare 8 wt% H with deionized water 2 o 2 The solution was put into a 1000mL Erlenmeyer flask, the chopped carbon fibers were completely immersed, and the oxidation treatment was performed in an ultrasonic water bath for 60min, the ultrasonic power was 150W, the frequency was 50000Hz, and the temperature was set at 45°C. Then rinse the surface-treated chopped carbon fibers with deionized water until neutral, put them in a vacuum oven at 110°C for 2 hours, and then set aside.

[0062] (1') acid chloride

[0063]Pre-oxidized carbon fibers were dried at 110°C for 2 hours and placed in 500mL of SOCl 2 and 5mL of DMF in the mixed solution (the SOCl 2 The amount accounts for 8% of the mass of the carbon fiber of the pre-oxidation), ultrasonic heating to 70 ℃ for 2h, decompression distillation to remove excess SOCl 2 , to...

Embodiment 2

[0067] This embodiment provides a method for increasing the volume resistivity of carbon fibers, the steps are as follows:

[0068] (1) Preoxidation

[0069] Prepare 10 wt% H with deionized water 2 o 2 The solution was put into a 500mL Erlenmeyer flask, the chopped carbon fibers were completely immersed, and the ultrasonic water bath was oxidized for 30min, the ultrasonic power was 200W, the frequency was 40000Hz, and the temperature was set at 45°C. Then rinse the surface-treated chopped carbon fibers with deionized water until neutral, put them in a vacuum oven at 110°C for 2 hours, and then set aside.

[0070] (2) Grafting reaction

[0071] Put 400mL of propylene glycol monoethyl ether / tetrahydrofuran mixture into 1000mL Erlenmeyer flask, add 200g of pre-oxidized carbon fibers, after ultrasonic vibration for 30min, add 0.6g of POSS compound EP0421 containing active groups to obtain mixed solution (the concentration of POSS compound 0.1wt%), react in an ultrasonic water ...

Embodiment 3

[0073] This embodiment provides a method for increasing the volume resistivity of carbon fibers, the steps are as follows:

[0074] (1) Preoxidation

[0075] Prepare 15 wt% H with deionized water 2 o 2 The solution was put into a 500mL Erlenmeyer flask, the chopped carbon fibers were completely immersed, and subjected to an ultrasonic water bath oxidation treatment for 45min, with an ultrasonic power of 150W, a frequency of 30000Hz, and a temperature setting of 35°C. Then rinse the surface-treated chopped carbon fibers with deionized water until neutral, put them in a vacuum oven at 110°C for 2 hours, and then set aside.

[0076] (2) Grafting reaction

[0077] Put 400mL of propylene glycol monoethyl ether / tetrahydrofuran mixture into 1000mL Erlenmeyer flask, add 200g of pre-oxidized carbon fibers, after ultrasonic vibration for 30min, add 60g of POSS compounds (SO1400 and EP0409) containing active groups to obtain a mixed solution (POSS The concentration of the compound is...

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Abstract

The invention relates to a method for improving the volume resistivity of a carbon fiber, the modified carbon fiber and application of the carbon fiber. The method includes the following steps of firstly, oxidizing a carbon fiber base body to obtain a pre-oxidized carbon fiber; secondly, conducting grafting reaction on the pre-oxidized carbon fiber and a cage-shaped polysilsesquioxane compound with an active group to obtain the modified carbon fiber, wherein the active group includes arbitrary one of or the combination of at least two of an epoxy group, a vinyl group, an amino group, a sulfydryl group, a silanol group, a hydroxyl group and a carboxylic acid group, and the modified carbon fiber is used for insulating engineering plastic. Through the method, the modified carbon fiber with high volume resistivity and low dielectric constant can be obtained and can be applied in the insulating engineering plastic.

Description

technical field [0001] The invention relates to the technical field of surface modification, in particular to a method for increasing the volume resistivity of carbon fibers, modified carbon fibers and applications thereof. Background technique [0002] Carbon fiber (CF for short) is a new type of fiber material with high strength and high modulus fibers with a carbon content of more than 95%. Carbon fiber is "soft on the outside and rigid on the inside". It is lighter in weight than metal aluminum, but its strength is higher than that of steel. It also has the characteristics of corrosion resistance and high modulus, and has excellent comprehensive performance. The main properties of carbon fiber are as follows: (1) small specific gravity (1.7-2.13g / cm); (2) high modulus (200-700GPa), large specific modulus, the Young's modulus of carbon fiber is 3 times that of glass fiber, Kevlar It is about 2 times that of drawing fiber; (3) high strength (3-7GPa), high specific strengt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/50D06M15/643D06M11/75C08L81/02C08K9/02C08K9/06C08K7/06D06M101/40
Inventor 赖华林曹艳霞邓冬颜
Owner SHENZHEN HALCYON NEW MATERIALS
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