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Method for preparing SiC/C nano-fiber membrane by electrostatic spinning

A nanofiber membrane and electrospinning technology, which is applied in the direction of spinning solution preparation, fiber treatment, fiber chemical characteristics, etc., can solve the problems of low yield, limited length of SiC products, complicated process, etc., and achieve high efficiency and spinnable Good performance and simple preparation process

Active Publication Date: 2012-02-15
苏州宋和纤维科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, SiC nanofibers or nanorods are prepared by high-pressure reaction method, sol-gel combined with carbothermal reduction method, template method, high-pressure reaction method, etc. The SiC product has limited length, low yield, relatively complicated process, and catalyst will introduce Impurities equal disadvantages

Method used

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  • Method for preparing SiC/C nano-fiber membrane by electrostatic spinning
  • Method for preparing SiC/C nano-fiber membrane by electrostatic spinning
  • Method for preparing SiC/C nano-fiber membrane by electrostatic spinning

Examples

Experimental program
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Effect test

Embodiment 1

[0021] N 2 Add 7.2mL of dimethyldichlorosilane, 20.75mL of diphenyldichlorosilane and 9.3mL of trimethylchlorosilane dropwise into a 1L reaction kettle containing 9.0g of Na and 200mL of xylene in 15min, at 98℃ After refluxing for 24 hours, suction filtration, the filtrate was added dropwise into anhydrous methanol to obtain a white precipitate, which was washed with methanol and deionized water respectively to obtain a dimethylsilane-diphenylsilane copolymer. The polysilane copolymer has a weight average molecular weight of 600 and a molecular weight distribution coefficient of 1.46 as determined by GPC. Weigh 1 g of dimethylsilane-diphenylsilane copolymer and dissolve it in xylene to prepare a 5% solution (A); weigh 1 g of polyacrylonitrile and dissolve it in DMF to prepare a 5% solution (B). Measure 1mL of A solution and 5mL of B solution, mix them and stir for 30min to make spinning solution. The above spinning solution was sucked into the needle tube and spun at a volta...

Embodiment 2

[0023] N 2 Under protection, add 12mL of dimethyldichlorosilane, 12.5mL of diphenyldichlorosilane and 0.5mL of trimethylchlorosilane dropwise into a 1L reaction kettle containing 7.5g of Na and 200mL of xylene in 15 minutes, and reflux at 113°C After 16 hours, it was filtered with suction, and the filtrate was added dropwise to methanol to obtain a white precipitate, which was washed with methanol and deionized water respectively to obtain a dimethylsilane-diphenylsilane copolymer. The polysilane copolymer has a weight-average molecular weight of 10,000 and a molecular weight coefficient of 1.50 as determined by GPC. Weigh 2 g of dimethylsilane-diphenylsilane copolymer and dissolve in tetrahydrofuran to prepare a 10% solution (A); weigh 2 g of polyacrylonitrile and dissolve in DMF to prepare a 10% solution (B). Measure 5mL of solution A and 1mL of solution B, mix them and stir for 30min to prepare spinning solution. The above-mentioned spinning solution was sucked into the n...

Embodiment 3

[0025] N 2 Under protection, the mixture of 12.0mL dimethyldichlorosilane, 20.75mL diphenyldichlorosilane and 3.0mL trimethylchlorosilane was added dropwise in 15 minutes to a 1L reaction kettle containing 9.8g Na and 200mL xylene, at 138°C After refluxing for 10 h, suction filtration was performed, and the filtrate was added dropwise to methanol to obtain a white precipitate, which was washed with methanol and deionized water respectively to obtain a dimethylsilane-diphenylsilane copolymer. The weight-average molecular weight of the polysilane copolymer measured by GPC is 2400, and the molecular weight coefficient is 1.35. Weigh 2 g of dimethylsilane-diphenylsilane copolymer and dissolve in tetrahydrofuran to prepare a 20% solution (A); weigh 1.5 g of polyacrylonitrile and dissolve in DMF to prepare a 15% solution (B). Measure 3mL each of A and B solutions, mix them and stir for 30min to make spinning solution. The above-mentioned spinning solution was sucked into the needl...

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Abstract

The invention discloses a method for preparing a SiC / C nano-fiber membrane by electrostatic spinning. The method comprises the following steps: (1) synthesizing a soluble dimethylsilane-diphenylsilane copolymer; (2) blending dimethylsilane-diphenylsilane copolymer solution with polyacrylonitrile solution for preparing spinning solution; (3) performing the electrostatic spinning on the spinning solution to prepare a precursor fiber membrane; (4) performing curing treatment on the precursor fiber membrane prepared by electrostatic spinning at the temperature of 90-250 DEG C, and further sintering under an inert atmosphere at the temperature of 900-1500 DEG C so as to prepare the SiC / C nano-fiber membrane. The preparation method provided by the invention is simple and easy to operate, and electrostatic spinning nano-fiber obtained through the preparation method is a catalyst with high specific surface area, good thermal stability and excellent mechanical properties, or a carrier materialand a high temperature-resistant filter material thereof, thereby having potential application prospects in the fields of nano-wire devices, the filter materials, compound enhancing materials and thelike.

Description

technical field [0001] The invention relates to a method for preparing a nanofiber membrane, in particular to a method for preparing a SiC / C nanofiber membrane by electrospinning. Background technique [0002] Silicon carbide fiber has excellent characteristics such as high temperature strength, strong oxidation resistance, good wear resistance, good thermal stability, small thermal expansion coefficient, high hardness, thermal shock resistance and chemical corrosion resistance, etc., and is widely used in various high-temperature structural components. Part reinforcements. Since Yajama prepared SiC fibers by polycarbosilane precursor conversion method in 1975, SiC-based fibers have been developed into Nicalon, Tyronno, Sylramic and other series of fibers, and are widely used in high temperature resistance and oxidation resistance environments due to their excellent performance. high performance ceramic and metal matrix composites. These fibers are usually formed by melt s...

Claims

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Application Information

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IPC IPC(8): D04H1/72D01D1/02D01D5/00D06C7/04D01F8/18C08G77/60
Inventor 姚菊明王元前陈建军
Owner 苏州宋和纤维科技有限公司
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