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High-strength polyimide nano fiber biaxial tension film as well as preparation method and application thereof

A nanofiber, polyimide technology, applied in fiber processing, textile and papermaking, filament/thread forming, etc., can solve the problems of low tensile strength, small fiber diameter, and small tensile strength of single fiber. , to achieve the effect of excellent porosity

Active Publication Date: 2014-04-30
SHENZHEN HIFUTURE ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, because electrospun nanofibers cannot be strengthened by post-spinning drawing processing like traditional spinning fibers, and the diameter of the fibers is small, the relative strength of electrospun nanofibers is not only small, but also the tensile strength of a single fiber is very high. Small
Therefore, the strength of electrospun nanofiber nonwovens composed of such nanofibers with very small tensile strength or absolute strength is very low, generally no more than 10 MPa, so that such electrospun nanofiber nonwovens cannot be used as independent supports material used, or cannot be used as a self-supporting material
At present, electrospun nanofiber nonwovens can only be used in combination with other support materials with appropriate strength

Method used

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  • High-strength polyimide nano fiber biaxial tension film as well as preparation method and application thereof
  • High-strength polyimide nano fiber biaxial tension film as well as preparation method and application thereof
  • High-strength polyimide nano fiber biaxial tension film as well as preparation method and application thereof

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preparation example Construction

[0024] The preparation method of a class of high-strength imide nanofiber biaxially stretched film of the present invention, its step comprises:

[0025] (1) Synthesis and electrospinning of polyamic acid: Based on the principle that the total molar amount of aromatic dianhydride is equal to the total molar amount of aromatic diamine, an appropriate amount of a dianhydride monomer and a diamine monomer are mixed, and Add an appropriate amount of solvent into the polymerization reactor, stir and react for a period of time to obtain a polyamic acid (polyimide precursor) solution, and carry out electrospinning of the polyamic acid solution in a high-voltage electric field, using a stainless steel mesh The belt is a collector to collect polyamic acid nanofiber nonwoven fabric. The solvent used is preferably N,N-dimethylacetamide (DMAC); the temperature of the reaction kettle is 0-10°C; the stirring reaction time is preferably 1-6h, and the electric field strength of the high-volta...

Embodiment 1

[0030] Example 1: Pyrimidinediamine / / biphenyldianhydride (PRM / / BPDA) polyimide nanofiber biaxially stretched film preparation of

[0031] Preparation steps (1) Polymer synthesis and electrospinning: Take a certain amount of purified pyrimidine diamine (PRM) and biphenyl dianhydride (BPDA) and an appropriate amount of solvent N,N-dimethylethane at a molar ratio of 1.0:1.0 Amide (DMAC), in a polymerization reactor at 5°C, stirred and reacted for 6 hours to obtain a polyimide precursor (polyamic acid) solution with a mass concentration of 10% and an absolute viscosity of 6.5 Pa·S. The polyamic acid solution is electrospun in an electric field with an electric field strength of 250kV / m, and a stainless steel mesh belt with a width of 0.3 meters is used as a collector to collect polyamic acid nanofiber nonwovens, and the belt speed is 1.0m / min.

[0032]Preparation step (2) Biaxial stretching imidization, using the above furnace temperature gradient from 200-400°C from the inle...

Embodiment 2

[0034] Example 2: Biaxially stretched film of p-phenylenediamine / / biphenyldianhydride (PDA / / BPDA) polyimide nanofibers preparation

[0035] Preparation steps (1) Polymer synthesis and electrospinning: Take a certain amount of purified p-phenylenediamine (PDA) and biphenyldianhydride (BPDA) and an appropriate amount of solvent N,N-dimethyl at a molar ratio of 1.0:1.0 Acetamide (DMAC) was stirred and reacted for 4 hours in a polymerization reactor at 0°C to obtain a polyimide precursor (polyamic acid) solution with a mass concentration of 8% and an absolute viscosity of 5.2Pa·S. The polyamic acid solution is electrospun in an electric field with an electric field strength of 300kV / m, and a stainless steel mesh belt with a width of 0.3 meters is used as a collector to collect polyamic acid nanofiber nonwoven fabrics, and the belt speed is 1.0m / min.

[0036] Preparation step (2) Biaxial stretching imidization, using the above furnace temperature from the entrance to the exit...

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Abstract

The invention provides a high-strength polyimide nano fiber biaxial tension film which is prepared by tensioning an electric texture polyamide acid nano fiber non-woven fabric in two directions, namely, the longitudinal direction for 1-10 times and the transverse direction for 1-4 times at the high temperature of 200-400 DEG C, wherein the structural formula of polyimide is as shown in the specification, wherein R1 is dianhydride residue with aromatic rings, R2 is diamino residue with aromatic rings, and n is a polymer repeating unit number which is within 100 to 500. The high-strength polyimide nano fiber biaxial tension film provided by the invention is high temperature resisting, high in chemical stability, excellent in mechanical strength and good in air permeability and moisture-penetrability. The invention further provides a preparation method of the high-strength polyimide nano fiber biaxial tension film, and an application of the high-strength polyimide nano fiber biaxial tension film as an electric insulating film, a high-temperature filtering film, a lithium battery partitioning film and a resin composite material in making liners of filler reinforcing, rainproof and breathable clothes, space navigation photon sail materials, and the like.

Description

technical field [0001] The invention relates to a polyimide film, in particular to a polyimide nanofiber biaxially stretched film, its preparation method and application. Background technique [0002] Electrospinning is currently the only means of producing continuous nanofibers most efficiently. In recent decades, the research work in this field has developed rapidly, especially with the discovery of the unique functions of nanomaterials and the discovery of the functions of nanocomposites. The field of information technology and the field of medical technology have attracted extensive attention. [0003] The industrialization of electrospinning technology is quietly unfolding all over the world. Donaldson Company of the United States is the first company to develop electrospinning technology on an industrial scale, producing electrospun nylon nanofibers with a diameter of 200-1000nm and conventional nonwoven composite filter materials; DuPont uses electrospun fibers with...

Claims

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Application Information

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IPC IPC(8): C08G73/10C08J5/18D01D5/00
Inventor 侯豪情吕晓义何平
Owner SHENZHEN HIFUTURE ELECTRIC