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Copolymerized polyimide nanofiber nonwoven and preparation method and application thereof

A technology of co-polyimide and co-polyamic acid, which is applied in the fields of non-woven fabrics, fiber chemical characteristics, textiles and papermaking, and can solve problems such as explosion, battery short circuit, thermal runaway, etc.

Active Publication Date: 2011-02-16
JIANGXI XIAN CAI NANOFIBERS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Polyethylene (PE), polypropylene (PP) and other battery separators currently used in the battery industry cannot guarantee their integrity at higher temperatures due to their low melting temperature and high thermal shrinkage ratio. In the case of overcharging, etc., there are often serious accidents such as thermal runaway and explosion caused by thermal shrinkage or even melting of the battery diaphragm, internal short circuit of the battery, etc.

Method used

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  • Copolymerized polyimide nanofiber nonwoven and preparation method and application thereof
  • Copolymerized polyimide nanofiber nonwoven and preparation method and application thereof
  • Copolymerized polyimide nanofiber nonwoven and preparation method and application thereof

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preparation example Construction

[0059] A kind of preparation method of polyimide nanofiber nonwoven of the present invention, its step comprises:

[0060] (1) Based on the principle that the total molar amount of dianhydride functional groups is equal to the total molar amount of diamine functional groups, take an appropriate amount of a dianhydride monomer and two kinds of diamine monomers or mix two kinds of dianhydride monomers. Mix one kind of diamine monomer or two kinds of dianhydride monomers and two kinds of diamine monomers, put them into the polymerization reactor together with an appropriate amount of solvent, and stir for a period of time. Obtain copolyamic acid (polyimide precursor) solution, and this copolyamic acid solution is implemented electrospinning in high-voltage electric field, is collector with stainless steel roller, collects and obtains copolyamic acid nanofiber porous film or Non-woven. Wherein the solvent used is preferably one of N,N-dimethylformamide (DMF) and N,N-dimethylaceta...

Embodiment 1

[0064] The selected comonomers are a tetraacid dianhydride monomer and two diamine monomers. Mix the purified biphenyldianhydride (BPDA), p-phenylenediamine (PPD) and diphenyl ether diamine (ODA) with a molar ratio of 1:0.5:0.5, and mix them with N,N-dimethylformamide ( DMF) as a solvent, carried out according to the above reaction steps. In the reaction step (1), the temperature of the reaction kettle of this embodiment is 10°C, and the stirring reaction time is 6 hours; the electric field strength of the high-voltage electric field used in the electrospinning process is 300kV / m; Heating from room temperature to 200°C at a heating rate of 1 / min, staying at this temperature for 30 minutes, then heating to 350°C at a heating rate of 5°C / min, and staying at 350°C for 30 minutes, then cutting off the power supply and cooling to room temperature naturally.

[0065] Performance characterization: The mass concentration of the copolymerized polyamic acid (polyimide precursor) soluti...

Embodiment 2

[0067] The selected comonomers are a tetraacid dianhydride monomer and two diamine monomers. The purified pyromellitic dianhydride (PMDA), diphenyl ether diamine (ODA) and biphenyl diamine (Bz) in a molar ratio of 1:0.6:0.4 were mixed with N,N-dimethylformamide ( DMF) is made solvent, reacts by above-mentioned steps, and in reaction step (1), the temperature of this embodiment reactor is 5 ℃, and the stirring reaction time is 6 hours; In the step (2), the heating program is heated from room temperature to 250°C at a heating rate of 20°C / min, staying at this temperature for 30 minutes, then heating to 370°C at a heating rate of 5°C / min, and staying at 370°C for 30 minutes , then cut off the power supply and let it cool down to room temperature naturally.

[0068] Performance characterization: The mass concentration of the copolymerized polyamic acid (polyimide precursor) solution is 5%, the absolute viscosity is 4.8Pa·S, the diameter of the copolymerized polyamic acid nanofibe...

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Abstract

The invention relates to a copolymerized polyimide nanofiber nonwoven and a preparation method and application thereof. The preparation method comprises the following steps of: reacting a tetracid dianhydride monomer with a diamine monomer by taking a high-polar solvent as a reaction medium; performing condensation polymerization through mechanical agitation in a reaction kettle to form copolymerized polyimide acid solution; performing electrostatic spinning on the copolymerized polyimide acid solution in a high-voltage electric field so as to obtain the copolymerized polyimide nanofiber nonwoven; performing imidization on the nonwoven at a high temperature to prepare the copolymerized polyimide nanofiber nonwoven which has the characteristics of high tear resistance, high porosity, high temperature and low temperature resistance and high mechanical properties. The copolymerized polyimide nanofiber nonwoven is mainly used for battery diaphragms and capacitor diaphragms.

Description

technical field [0001] The invention relates to a copolymerized polyimide and its preparation method and application, in particular to a polyimide nanofiber nonwoven fabric, a preparation method and its application as a battery diaphragm. Background technique [0002] Chemical power sources are an extremely important part of modern life, such as mobile phone batteries, automotive power batteries under development, etc. are all indispensable products for human beings to pursue high-quality life. The safety of batteries is a major scientific and social issue of concern to people, and the development of safe battery separators is a key technology to solve the problem of battery safety. Polyethylene (PE), polypropylene (PP) and other battery separators currently used in the battery industry cannot guarantee their integrity at higher temperatures due to their low melting temperature and high thermal shrinkage ratio. In the case of overcharging, etc., there are often serious acci...

Claims

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Application Information

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IPC IPC(8): D01F6/78D04H3/00C08G73/10H01M2/16D04H1/4326D04H1/728H01M50/411H01M50/423
CPCY02E60/10
Inventor 侯豪情程楚云陈水亮周小平吕晓义何平匡晓明任金生
Owner JIANGXI XIAN CAI NANOFIBERS TECH
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