Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for preparing carbon fiber with boron nitride coating on surface from polyacrylonitrile

A technology of polyacrylonitrile and boron nitride, applied in the direction of fiber treatment, fiber type, fiber chemical characteristics, etc., can solve the problems of high cost, high coating process preparation temperature, complex process, etc., and achieves higher service temperature and higher temperature Antioxidant performance, solve the effect of complex process

Inactive Publication Date: 2018-05-25
SHANDONG UNIV
View PDF5 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can overcome the shortcomings of the existing technology, solve the problems of high preparation temperature, complicated process and high cost of the existing coating process, increase the oxidation resistance of carbon fiber, and increase its service temperature

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing carbon fiber with boron nitride coating on surface from polyacrylonitrile
  • Method for preparing carbon fiber with boron nitride coating on surface from polyacrylonitrile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step 1: Degreasing, decontaminating and drying the polyacrylonitrile surface;

[0028] Step 2: Using absolute ethanol as a solvent, dissolve boric acid and urea in absolute ethanol at a molar ratio of 2:1, configure the concentration of boric acid to be 0.6mol / L, stir and disperse it in an ultrasonic wave to a uniform solution, and then Put polyacrylonitrile into the solution and soak for 2h;

[0029] Step 3: Dry the modified polyacrylonitrile precursor obtained in step 2 in an oven at 80°C for 0.5h, then put the polyacrylonitrile precursor into a pre-oxidation furnace, heat it to 260°C, and pre-oxidize it in the air. Oxidation 2h;

[0030] Step 4: Put the modified polyacrylonitrile pre-oxidized wire obtained in Step 3 into a tube furnace, raise the temperature to 800°C at a rate of 2°C / min in a nitrogen atmosphere, then keep it warm for 4 hours, and then heat it up at a rate of 2°C / min. The samples were taken out after cooling down to room temperature.

[0031] The ...

Embodiment 2

[0033] Step 1: Degreasing, decontaminating and drying the polyacrylonitrile surface;

[0034] Step 2: Using absolute ethanol as a solvent, dissolve boric acid and urea in absolute ethanol at a molar ratio of 3:1, configure the concentration of boric acid to be 0.7mol / L, stir and disperse it in an ultrasonic wave to a uniform solution, and then Put polyacrylonitrile into the solution and soak for 2h;

[0035] Step 3: Dry the modified polyacrylonitrile precursor obtained in step 2 in an oven at 80°C for 0.5h, then put the polyacrylonitrile precursor into a pre-oxidation furnace, heat it to 260°C, and pre-oxidize it in the air. Oxidation 2.5h;

[0036] Step 4: Put the modified polyacrylonitrile pre-oxidized wire obtained in Step 3 into a tube furnace, raise the temperature to 800°C at a rate of 2°C / min in a nitrogen atmosphere, then keep it warm for 4 hours, and then heat it up at a rate of 2°C / min. The samples were taken out after cooling down to room temperature.

[0037] Th...

Embodiment 3

[0039] Step 1: Degreasing, decontaminating and drying the polyacrylonitrile surface;

[0040] Step 2: Using absolute ethanol as a solvent, dissolve boric acid and urea in absolute ethanol at a molar ratio of 3.5:1, configure the concentration of boric acid to be 0.6mol / L, stir and disperse it in an ultrasonic wave to a uniform solution, and then Put polyacrylonitrile into the solution and soak for 2h;

[0041] Step 3: Dry the modified polyacrylonitrile precursor obtained in step 2 in an oven at 80°C for 0.5h, then put the polyacrylonitrile precursor into a pre-oxidation furnace, heat it to 270°C, and pre-oxidize it in the air. Oxidation 2.5h;

[0042] Step 4: Put the modified polyacrylonitrile pre-oxidized wire obtained in Step 3 into a tube furnace, raise the temperature to 900°C at a rate of 3°C / min in a nitrogen atmosphere, then keep it warm for 5 hours, and then heat it at a rate of 3°C / min The samples were taken out after cooling down to room temperature.

[0043] The ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for preparing carbon fiber with a boron nitride coating on the surface from polyacrylonitrile, and belongs to the field of high-temperature anti-oxidization coating preparation. The method for preparing the carbon fiber with the boron nitride coating on the surface from the polyacrylonitrile comprises the following steps of 1, performing oil removal, decontamination and drying on polyacrylonitrile raw yarns; 2, by using absolute ethyl alcohol as a solvent, preparing a boric acid urea soaking solution from boric acid and urea; 3, putting the polyacrylonitrile obtained in step 1 into the boric acid urea soaking solution obtained in step 2 to be soaked; then, performing drying; 4, putting the polyacrylonitrile obtained in step 3 into a pre-oxidization furnaceto be subjected to pre-oxidization; 5, putting the polyacrylonitrile obtained in step 4 into a high-temperature tubular furnace; raising the temperature in a protection gas atmosphere; performing heatinsulation; lowering the temperature to room temperature; then, taking out a sample. The method provided by the invention can solve the problems that other carbon fiber surface boron nitride coatingpreparation methods need high temperature, the process is complicated, the cost is low and the like. The high-temperature anti-oxidization performance of the carbon fiber is improved; the use temperature is raised.

Description

technical field [0001] The invention relates to the field of preparation of high-temperature anti-oxidation coatings, in particular to a method for preparing carbon fibers coated with boron nitride on the surface by using polyacrylonitrile. Background technique [0002] Carbon fiber is a new type of high-performance fiber material with a carbon content of more than 92%. It has many excellent properties such as light weight, high strength, high modulus, wear resistance, corrosion resistance, fatigue resistance, electrical conductivity, thermal conductivity, and far-infrared radiation. Therefore, carbon fiber has become an irreplaceable pillar material for the national defense civilian industry. At present, oxidation and carbonization of polyacrylonitrile (polyacrylonitrile) fibers have become the mainstream technology for research and production of carbon fibers. However, the high-temperature oxidation resistance of carbon fiber is low, and it will start to oxidize when the ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): D01F9/22D06M11/82D06M13/432D06M101/28
CPCD01F9/225D06M11/82D06M13/432D06M2101/28C04B35/62868C04B35/62886C04B2235/5248C04B2235/6562C04B2235/6567
Inventor 王延相付善龙刘群马连茹王瑶瑶瞿策
Owner SHANDONG UNIV
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com