Preparation method of carbon/silicon hybrid fiber and carbon/silicon hybrid fiber

A technology of silicon hybridization and fiber, which is applied in the field of fiber, can solve the problems of poor mechanical strength and incompressibility, and achieve the effect of low density, high modulus and good conductivity

Active Publication Date: 2020-05-19
福建拓烯新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pure silica aerogels have disadvantages such as poor mechanical strength and incompressibility.

Method used

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  • Preparation method of carbon/silicon hybrid fiber and carbon/silicon hybrid fiber
  • Preparation method of carbon/silicon hybrid fiber and carbon/silicon hybrid fiber
  • Preparation method of carbon/silicon hybrid fiber and carbon/silicon hybrid fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Mix 10g of 1,4-bis(trimethoxysilyl)benzene, 856g of methyltrimethoxysilane, 4500ml of DMF and 600ml of deionized water, add 1mol / L dilute hydrochloric acid to adjust the pH to 2.5 for hydrolysis, then add ammonia water to adjust the pH to 9.5 Condensation was carried out to obtain a gel, which was aged at 40° C. for 45 hours, soaked in DMF for 20 hours twice, and taken out to obtain a wet gel.

[0033] Take 10g of wet gel and pulverize it into a mesh of no more than 2000, add it to 8g of polyacrylonitrile DMF solution with a concentration of 10wt%, mix well, and use the electrospinning process to obtain the raw silk. , 220°C, 235°C, 250°C, 270°C, and 300°C for 8 minutes, respectively, and then carbonized at 1000°C for 160 seconds under a nitrogen atmosphere to obtain a silicon / carbon hybrid fiber 1.

Embodiment 2

[0035] Mix 10g of 1,4-bis(triethoxysilyl)benzene, 520g of ethyl orthosilicate, 2800ml of DMF and 400ml of deionized water, add 1mol / L dilute hydrochloric acid to adjust the pH to 2.5 for hydrolysis, then add sodium carbonate to adjust the pH to 9.0 was condensed to obtain a gel, which was aged at 50°C for 30 hours, then soaked in DMF for 20 hours twice, and taken out to obtain a wet gel.

[0036] Take 10g of wet gel and crush it into a mesh of no more than 2000, add it to 20g of polyacrylonitrile DMF solution with a concentration of 6wt%, mix well, and use wet spinning process to obtain raw silk, which is pre-oxidized at 205°C in air atmosphere 9 minutes, 9 minutes of pre-oxidation at 220°C, 8 minutes of pre-oxidation at 250°C, 8 minutes of pre-oxidation at 280°C, and 5 minutes of pre-oxidation at 320°C, and then stay at 1200°C for 120 seconds and 2000°C for 20 seconds under nitrogen atmosphere. A silicon / carbon hybrid fiber 2 was obtained.

Embodiment 3

[0038] Mix 10g of 1,4-bis(trimethoxysilylethyl)benzene, 41g of methyltrimethoxysilane, 41g of ethyl orthosilicate, 480ml of DMF and 200ml of deionized water, add 1mol / L oxalic acid solution to adjust the pH to 2.5 Hydrolyze, then add ammonia water to adjust the pH to 9.0 and condense to obtain a gel. The gel is aged at 40°C for 45 hours, then soaked in DMF for 20 hours twice, and taken out to obtain a wet gel.

[0039] Take 10g of wet gel and crush it into a mesh of no more than 2000, add it to 40g of polyacrylonitrile DMF solution with a concentration of 14wt%, mix well, and use wet spinning process to obtain raw silk, which is pre-oxidized at 205°C in air atmosphere 9 minutes, pre-oxidation at 220°C for 9 minutes, pre-oxidation at 250°C for 8 minutes, pre-oxidation at 280°C for 8 minutes, and pre-oxidation at 320°C for 5 minutes, and then stay at 1500°C for 120 seconds in a nitrogen atmosphere to obtain silicon / carbon hybrid fibers 3.

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PUM

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Abstract

The invention belongs to the technical field of fibers, and particularly relates to a preparation method of a carbon / silicon hybrid fiber. The preparation method comprises the following steps of carrying out hydrolytic condensation on an alkoxy-containing silicon-based benzene compound and a silane coupling agent in a mixed solvent of N,N-dimethylformamide and deionized water to obtain wet gel, crushing the wet gel, adding the crushed wet gel into a polyacrylonitrile solution, and carrying out spinning, pre-oxidation and high-temperature carbonization to obtain the carbon / silicon hybrid fiber.The carbon / silicon hybrid fiber has the characteristics of spinnability, low density, high specific surface area, high strength, conductivity and the like, and is suitable for the fields of aerospace, chemical engineering, machinery, electronics and the like.

Description

technical field [0001] The invention relates to the field of fiber technology, in particular to a method for preparing a carbon / silicon hybrid fiber and the carbon-silicon hybrid fiber. Background technique [0002] Silica airgel is a kind of dry gel, and the medium filled in the space network structure of the gel is gas, which has the characteristics of high porosity, low density, nanoscale cavity size, high specific surface area and low thermal conductivity. , has huge potential application value in the fields of thermal insulation materials, carriers, and acoustic materials. However, pure silica aerogels have disadvantages such as poor mechanical strength and incompressibility. [0003] Carbon fiber is a high-strength, high-modulus new fiber material with a carbon content of more than 95%, which is obtained from organic fibers through pre-oxidation and carbonization (or graphitization). The quality of carbon fiber is lighter than metal aluminum, but its strength is high...

Claims

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Application Information

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IPC IPC(8): D01F9/08D01F9/22
CPCD01F9/08D01F9/22Y02E60/10
Inventor 翁朝阳
Owner 福建拓烯新材料科技有限公司
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