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Electrospun carbon-doped polyimide conductive nanofiber long yarn preparation process

A technology of polyimide and conductive nanometers, which is applied in the chemical characteristics of fibers, the cutting of textile materials, and conjugated synthetic polymer artificial filaments. It can solve the problems of manufacturing discontinuous linear density thick yarns and achieve excellent conductivity. Sexuality and mechanical properties, efficient and preparation process, the effect of advanced preparation process

Active Publication Date: 2019-09-06
JIANGXI XIAN CAI NANOFIBERS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the current electrospinning technology is only used to make nonwovens or to spray a thin layer of nano-spider web on industrial nonwovens, with a general surface density of 1g / m 2 It can also produce discontinuous thick yarns with high linear density. Generally, the linear density of conventional fiber yarns is above 6Tex, and the counts of yarns are generally less than 150 counts, and most of them are below 100 counts. Therefore, There is no technology that can continuously manufacture conductive PI (nano) fiber yarns that meet ultra-small linear density or ultra-high count and excellent mechanical properties

Method used

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  • Electrospun carbon-doped polyimide conductive nanofiber long yarn preparation process
  • Electrospun carbon-doped polyimide conductive nanofiber long yarn preparation process
  • Electrospun carbon-doped polyimide conductive nanofiber long yarn preparation process

Examples

Experimental program
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Effect test

Embodiment 1

[0086] Embodiment 1 provides a kind of preparation process of electrospun carbon-doped polyimide conductive nanofiber long yarn, and the steps include:

[0087] Step 1: Purify the monomer (I) and monomer (II) and add them to the polymerization reactor according to the molar ratio of 1:1, add a solvent whose mass is 5.5 times the total mass of the monomers at 0°C, and react for 10 hours Finally, the polyamic acid solution is obtained, and then hydroxyalkylcellulose powder is added to the polyamic acid solution according to the mass ratio of the polymer PAA and hydroxyalkylcellulose at 1:1, and mechanically stirred to dissolve and mix at 0°C. Finally, an appropriate amount of N,N-dimethylacetamide was added to dilute to an absolute viscosity of 3.1 Pa·s to obtain a spinning raw material solution of polyamic acid and hydroxyalkyl cellulose;

[0088] Wherein, the monomer (I) is R 1 A dianhydride having a structure of general formula (I) which is a benzophenone dianhydride residue...

Embodiment 2

[0093] Embodiment 2 provides a kind of preparation process of electrospun carbon-doped polyimide conductive nanofiber long yarn, and the steps include:

[0094] Step 1: Purify the monomer (I) and monomer (II) and add them to the polymerization reactor according to the molar ratio of 1:1, add a solvent whose mass is 5.5 times the total mass of the monomers at 30°C, and react for 1 hour Finally, the polyamic acid solution is obtained, and then according to the mass ratio of polymer PAA and hydroxyalkylcellulose is 9:1, hydroxyalkylcellulose powder is added to the polyamic acid solution, and mechanically stirred at 30°C to dissolve and mix. Finally, an appropriate amount of N,N-dimethylacetamide was added to dilute to an absolute viscosity of 2.3 Pa·s to obtain a spinning raw material solution of polyamic acid and hydroxyalkyl cellulose;

[0095] Wherein, the monomer (I) is R 1 A dianhydride having a structure of general formula (I) which is a benzophenone dianhydride residue, a...

Embodiment 3

[0100] Embodiment 3 provides a kind of preparation process of electrospun carbon-doped polyimide conductive nanofiber long yarn, and the steps include:

[0101] Step 1: Purify the monomer (I) and monomer (II) and add them to the polymerization reactor according to the molar ratio of 1:1, add a solvent whose mass is 5.5 times the total mass of the monomers at 20°C, and react for 5 hours Finally, the polyamic acid solution is obtained, and then according to the mass ratio of polymer PAA and hydroxyalkylcellulose is 4:1, hydroxyalkylcellulose powder is added to the polyamic acid solution, and mechanically stirred to dissolve and mix at 20°C. Finally, an appropriate amount of N,N-dimethylacetamide was added to dilute to an absolute viscosity of 3.2 Pa·s to obtain a spinning raw material solution of polyamic acid and hydroxyalkyl cellulose;

[0102] Wherein, the monomer (I) is R 1 The dianhydride having the structure of general formula (I) which is diphenyl sulfide dianhydride res...

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Abstract

The invention relates to the technical field of chemical fiber spinning, in particular to an electrospun carbon-doped polyimide conductive nanofiber long yarn preparation process. The process includessteps: step one, purifying a monomer (I) and a monomer (II), adding into a polymerization reactor along with a solvent to obtain polyamic acid solution, and mechanically mixing with hydroxyalkyl cellulose solution to obtain polyamic acid and hydroxyalkyl cellulose spinning stock solution; step two, subjecting the spinning stock solution to electrospinning in a high-voltage electric field, collecting through a stainless steel net belt serving as a collector to obtain a PAA / hydroxyalkyl cellulose electrospun fiber felt or nonwoven fabric; step three, slitting the obtained PAA / hydroxyalkyl cellulose electrospun fiber felt or nonwoven fabric into slender strips in width of 0.5-5.0cm, and subjecting the slender strips to heat drafting imidization and hydroxyalkyl cellulose low-temperature carbonization to form oriented carbon-doped polyimide electrospun fiber bundles; step four, twisting the electrospun fiber bundles to obtain electrospun carbon-doped polyimide conductive nanofiber long yarns.

Description

technical field [0001] The invention belongs to the technical field of chemical fiber spinning, and more specifically, the invention relates to a preparation process of electrospun carbon-doped polyimide conductive nanofiber long yarn. Background technique [0002] Polyimide (PI) fiber is regarded as one of the most potential high-performance fiber materials due to its unique rigid aromatic heterocyclic ring structure. Due to its excellent mechanical, thermal and dielectric properties, it is widely used in aerospace, high temperature heat resistance, electronic devices and other fields. [0003] At present, the more commonly used method for preparing PI fibers is a two-step method, that is, polyamic acid (PAA) prepolymer is obtained by polycondensation reaction of dianhydride and diamine monomer in a polar solvent, and PAA is prepared by wet spinning process. The primary fiber is then subjected to thermal imidization or chemical imidization process to obtain PI fiber. [0...

Claims

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Application Information

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IPC IPC(8): D02G3/22D04H1/728D06H7/00D01F8/16D01F8/18
CPCD01F8/16D01F8/18D02G3/22D04H1/728D06H7/00D10B2401/16
Inventor 侯豪情欧阳文程楚云袁梦杰王煜明
Owner JIANGXI XIAN CAI NANOFIBERS TECH