Low dielectric polyimide fiber and preparation method thereof

A polyimide fiber and low-dielectric technology, which is applied in the field of low-dielectric polyimide fiber and its preparation, achieves the effects of wide source of raw materials, industrialized production, and simple synthesis method

Inactive Publication Date: 2015-11-04
JIANGSU XIANNUO NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But so far, there are many studies on the dielectric properties of polyimide films, but there

Method used

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  • Low dielectric polyimide fiber and preparation method thereof
  • Low dielectric polyimide fiber and preparation method thereof
  • Low dielectric polyimide fiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The synthesis of polyamic acid solution: according to the molar ratio of 6FDA: p-PDA=1: 1, diamine p-PDA is placed in the there-necked flask, and the solvent N, N-dimethylacetamide (DMAc ), stirred under nitrogen conditions to make it fully dissolved, then added 6FDA in batches and stirred so that the solid content of the solution was 10%. Stirring for 3 hours under the condition of nitrogen protection, the polyamic acid spinning solution with a certain viscosity was obtained, and its intrinsic viscosity was 1.97dL / g.

[0040] Preparation of polyamic acid fiber: filter and defoam the polyamic acid solution, and spin by wet spinning process.

[0041] Preparation of polyimide fibers: heat imidization of polyamic acid fibers through furnaces at 280° C., 350° C. and 400° C. in sequence, and a 2.5-fold draft is applied to them.

[0042] The tensile strength of the obtained fiber is 0.55GPa, the initial modulus is 20.2GPa, and its dielectric constant is 2.55 at a frequency o...

Embodiment 2

[0044] Synthesis of polyamic acid solution: according to the molar ratio of BPDA: 6FDA: p-PDA = 7: 3: 10, put the diamine p-PDA into a three-necked flask, and add a measured amount of solvent N, N-dimethyl Formamide (DMF) was stirred under nitrogen to make it fully dissolved, and then BPDA and 6FDA were mixed and added in batches and stirred so that the solid content of the solution was 15%. The mixture was stirred for 3 hours under the protection of nitrogen to obtain a polyamic acid spinning solution with a certain viscosity, and its intrinsic viscosity was 2.38dL / g.

[0045] Preparation of polyamic acid fiber: filter and defoam the polyamic acid solution, and spin by wet spinning process.

[0046] Preparation of polyimide fibers: heat imidization of polyamic acid fibers through furnaces at 280° C., 350° C. and 450° C. in sequence, and 3-fold drafting.

[0047] The tensile strength of the obtained fibers was 1.24GPa, the initial modulus was 33.6GPa, and the dielectric const...

Embodiment 3

[0049] Synthesis of polyamic acid solution: according to the molar ratio of BPDA: 6FDA: p-PDA = 9: 1: 10, diamine p-POA is placed in a three-necked flask, and a measured amount of solvent N-methylpyrrolidone (NMP ), stirred under nitrogen conditions to make it fully dissolved, then added in batches after mixing BPDA and 6FDA and stirred, so that the solid content of the solution was 10%. Stirring for 4 hours under the condition of nitrogen protection, the polyamic acid spinning solution with a certain viscosity was obtained, and its intrinsic viscosity was 2.53dL / g.

[0050] Preparation of polyamic acid fiber: filter and defoam the polyamic acid solution, and spin by wet spinning process.

[0051] Preparation of the polyimide fiber: the polyamic acid fiber is thermally imidized by passing through a heating furnace at 280° C., 350° C. and 420° C. sequentially, and a 4.0-fold draft is applied to it.

[0052] The tensile strength of the obtained fiber is 1.53GPa, the initial mod...

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Abstract

The present invention discloses a low dielectric polyimide fiber and a preparation method thereof, and belongs to the field of functional organic fibers. The fiber is prepared as follows: a copolymer polyamide acid spinning solution is prepared by condensation polymerization of hexafluorodianhydride (6FDA) and other dianhydride diamine; wet or dry-wet spinning process is used for spinning, poly amidoacid as-spun fiber is obtained by solidification and water washing; and the low dielectric polyimide fiber is prepared by thermal imidization and drawing processing of the fiber by gradient temperature, the tensile strength is up to 2.46GPa, initial modulus reaches 82.5GPa, and dielectric constant is as low as 2.55. The present invention provides a preparation method of the low dielectric polyimide fiber, has the characteristics of simple preparation method, low equipment requirements, extensive sources of raw materials, and continuous spinning production, and is suitable for industrial promotion.

Description

Technical field: [0001] The invention belongs to the technical field of functional organic fibers, and in particular relates to a low-dielectric polyimide fiber and a preparation method thereof. Background technique: [0002] Polyimide fiber has high strength and high modulus, high and low temperature resistance, chemical corrosion resistance, radiation resistance and excellent dielectric properties due to the rigid imide ring in the main chain of the molecule. As a high-performance functional fiber, polyimide fiber has broad application prospects and is currently mainly used in aerospace, military industry, marine development and fire protection, microelectronics, high-temperature media and other fields. Especially in the field of electronics industry, polyimide materials can be used as insulating dielectric layers in large-scale integrated circuits or shielding protective layers of integrated circuits. In order to reduce signal transmission delay, reduce line loss and int...

Claims

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Application Information

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IPC IPC(8): D01F6/78D01F6/74C08G73/10
Inventor 俞建刚
Owner JIANGSU XIANNUO NEW MATERIAL TECH
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