A kind of preparation method of polyimide-carbon nanotube composite fiber

A carbon nanotube composite, carbon nanotube technology, applied in the field of polymers, can solve problems such as mechanical properties, thermal properties and electrical properties need to be improved, product performance description, etc., to improve thermal stability, modulus, and uniform heating. Effect

Active Publication Date: 2016-07-06
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the patent does not have a specific description of the performance of the resulting product, and its mechanical properties, thermal properties and electrical properties need to be improved

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  • A kind of preparation method of polyimide-carbon nanotube composite fiber

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[0031] The invention provides a kind of preparation method of polyimide-carbon nanotube composite fiber, comprises the following steps:

[0032] a) providing surface-modified carbon nanotubes;

[0033] b) reacting the surface-modified carbon nanotubes with diamine monomers and dianhydride monomers in an organic solvent to obtain a polyamic acid-carbon nanotube composite;

[0034] c) spinning the polyamic acid-carbon nanotube composite obtained in step b) to obtain a polyamic acid-carbon nanotube composite fiber;

[0035] d) Imidizing and thermally drawing the polyamic acid-carbon nanotube composite fibers obtained in step c) to obtain polyimide-carbon nanotube composite fibers.

[0036] The method provided by the invention carries out surface modification to carbon nanotubes, so that the polymerization reaction of diamine and dianhydride is carried out in situ on the surface-modified carbon nanotubes, so that there is a good interface between the obtained polyamic acid and ca...

Embodiment 1

[0061] Add 5.00 g of carbon nanotubes, 150 mL of concentrated H to the flask 2 SO 4 and 50mL concentrated HNO 3 , first ultrasonic at 30°C for 2 hours, then stirred at 70°C for 24 hours; cool to room temperature, add deionized water to dilute, let stand until the carbon nanotubes precipitate, pour off the brownish-yellow clear liquid in the upper layer, and the black suspension in the lower layer Filtrate and wash until the filtrate becomes neutral to obtain a black filter cake of carbon nanotubes; vacuum-dry the obtained black filter cake at 100° C. for 24 hours to obtain carboxylated carbon nanotubes, which are stored for later use;

[0062] At room temperature, 0.375 g of the obtained carboxylated carbon nanotubes was added to 60 mL N, N-dimethylacetamide (DMAC) for ultrasonic dispersion for 2 h to obtain a uniform black suspension of carbon nanotubes in DMAC; under nitrogen protection, Add 170.204g (0.850mol) of diaminodiphenyl ether (ODA), 50.017g (0.170mol) of biphenyl...

Embodiment 2

[0071] At room temperature, 1.50 g of the carboxylated carbon nanotubes prepared in Example 1 were added to 100 mL of DMAC for ultrasonic dispersion for 2 hours to obtain a black uniform suspension of carbon nanotubes in DMAC; under nitrogen protection, sequentially add 136.163g (0.680mol) ODA and 273.360g (0.680mol) 4,4'-p-phenylene diether dianhydride, then add 1500mL DMAC to it, and react the resulting mixed solution at room temperature for 2 days, then carry out the reaction solution Filtration and defoaming to obtain spinning stock solution;

[0072] use figure 1 The schematic diagram of the dry and wet spinning process shown in the figure spins the obtained spinning dope, and the specific parameters are as follows:

[0073] The spinneret has 100 holes, the hole diameter is Φ0.16mm, the spray ratio is 2.0 times, and the air layer height is 120mm; after the as-spun fibers are washed with water, they are dried with hot rollers to obtain polyamic acid-carbon nanotube compos...

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Abstract

The invention provides a production method of polyimide and carbon nanotube composite fibers. The production method comprises step 1, providing surface modified carbon nanotubes; step 2, performing reaction on the surface modified carbon nanotubes and diamine monomers and dianhydride monomers in organic solvent to obtain polyamide acid and carbon nanotube composites; step 3, performing spinning on the polyamide acid and carbon nanotube composites obtained in the step 2 to obtain polyamide acid and carbon nanotube composite fibers; and step 4, performing imide and hot drafting on the polyamide acid and carbon nanotube composite fibers obtained in the step 3 to obtain the polyimide and carbon nanotube composite fibers. According to the production method of the polyimide and carbon nanotube composite fibers, the surface modified carbon nanotubes are utilized as raw materials and the reaction is performed on diamines and dianhydrides in the presence of the surface modified carbon nanotubes to enable obtained polymers and the carbon nanotubes to be well composited so as to enable the polyimide and carbon nanotube composite fibers to be high in mechanical strength, thermal stability and electrical conductivity.

Description

technical field [0001] The invention relates to the technical field of polymers, in particular to a preparation method of polyimide-carbon nanotube composite fibers. Background technique [0002] Polyimide fiber is a new type of special fiber. Compared with other aromatic high-performance organic fibers, it has higher thermal stability, higher elastic modulus and low water absorption, and can be obtained in harsher environments. application. Polyimide fibers and fabrics can be widely used in aerospace, nuclear power stations, combustible gas filters, heat-insulating carpets for strong heat source radiation, high-temperature fire-resistant protective clothing, racing flame-resistant clothing, protective clothing and flight clothing for armored forces, etc. [0003] Carbon nanotubes have the simplest chemical composition and atomic bonding form, but exhibit the most colorful structures and related physical and chemical properties. Carbon nanotubes can be used to prepare high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/94D01F1/09C08G73/10C08K9/02C08K9/04C08K7/00C08K3/04D01D5/06D01D5/12
Inventor 郑超邱雪鹏李国民刘芳芳董志鑫高连勋
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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