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A kind of preparation method of electrical and thermal conductivity functionalized carbon nanotube/tpu composite material

A carbon nanotube, electrical and thermal conductivity technology, which is applied in the field of polymer composite material synthesis, can solve the problems of rising cost of material selection, large dosage, inability to improve the performance of composite materials, etc., and achieve the effect of reducing costs.

Active Publication Date: 2021-07-27
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] At present, when preparing carbon nanotube / TPU composite materials with good electrical and thermal conductivity in the existing technology, oriented carbon nanotubes are often used, and the amount is large, which will lead to a substantial increase in the cost of material selection. When ordinary carbon nanotubes are used as the modified phase, they are easy to agglomerate in the matrix and cannot improve the performance of composite materials

Method used

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  • A kind of preparation method of electrical and thermal conductivity functionalized carbon nanotube/tpu composite material
  • A kind of preparation method of electrical and thermal conductivity functionalized carbon nanotube/tpu composite material

Examples

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preparation example Construction

[0040] 1) Preparation of functionalized carbon nanotubes: add 0.5g carbon nanotubes to 75mL 2mol / L H 2 SO 4 and 75mL4mol / L HNO 3 In the mixed solution, condense and reflux in an oil bath at 110°C, stir magnetically at 500rpm for 10h, and after cooling to room temperature, filter with suction several times and wash with deionized water until pH = 7 to obtain functionalized carbon nanotubes;

[0041] 2) Preparation of functionalized carbon nanotubes: add 100mg functionalized carbon nanotubes to 100mL deionized water, ultrasonically disperse for 1h, add 1mL glacial acetic acid dropwise under 500rpm magnetic stirring, slowly add 0.5g chitosan, and react at 30°C 10h. Then, the obtained product was suction-filtered, washed until neutral, and freeze-dried at -80° C. to obtain functionalized carbon nanotubes.

Embodiment 1

[0043] 1) Preparation of functionalized carbon nanotubes / DMF solution: Take 0.0335g of functionalized carbon nanotubes and add them to 10mL DMF (functionalized carbon nanotubes account for 0.25% of the total mass of TPU raw materials), and stir at 25°C and 500rpm Down stirring 8h standby;

[0044] 2) Add 10g of 4,4'-diphenylmethane diisocyanate into a three-necked flask that has been preheated to 75°C and connected to a vacuum dehydration device, and wait until the 4,4'-diphenylmethane diisocyanate is melted into After the transparent liquid, use a syringe to take the functionalized carbon nanotube / DMF solution obtained in step 1) and add it to the system, and react at 75°C for 1 hour under reduced pressure and mechanical stirring;

[0045] 3) Add 3 g of polytetramethylene ether glycol that has been dehydrated at high temperature to the system described in step 2), keep the conditions of reduced pressure and mechanical stirring, and react at 80°C for 3 hours;

[0046] 4) Add ...

Embodiment 2

[0051] 1) Preparation of functionalized carbon nanotubes / DMF solution: Add 0.0670g functionalized carbon nanotubes to 10mL DMF (functionalized carbon nanotubes account for 0.50% of the total mass of TPU raw materials), and stir at 25°C and 500rpm Down stirring 8h standby;

[0052] 2) Add 10g of 4,4'-diphenylmethane diisocyanate into a three-necked flask that has been preheated to 75°C and connected to a vacuum dehydration device, and wait until the 4,4'-diphenylmethane diisocyanate is melted into After the transparent liquid, use a syringe to take the functionalized carbon nanotube / DMF solution obtained in step 1) and add it to the system, and react at 75°C for 1 hour under reduced pressure and mechanical stirring;

[0053] 3) Add 3 g of polytetramethylene ether glycol that has been dehydrated at high temperature to the system described in step 2), keep the conditions of reduced pressure and mechanical stirring, and react at 80°C for 3 hours;

[0054] 4) Add 15mL DMF to the s...

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Abstract

The invention discloses a method for preparing a conductive and thermally conductive functionalized carbon nanotube / TPU composite material. Firstly, the functionalized carbon nanotube (CS-CNT) is obtained by modifying the functionalized carbon nanotube with chitosan, and then combined with 4, 4'-diphenylmethane diisocyanate reaction, then adding polytetramethylene ether glycol, 1,4-butanediol and a catalyst to synthesize the conductive and thermally conductive functionalized carbon nanotube / TPU composite through pre-polymerization-chain extension reaction Material. There are hydrogen bonds and electrostatic adsorption between chitosan and carbon nanotubes in the CS‑CNT molecule, between CS‑CNT, between CS‑CNT and TPU monomer, and between CS‑CNT and TPU matrix A large number of hydrogen bonds and covalent bonds lead to an enhanced binding force with the TPU matrix, an increased degree of crosslinking, and the formation of a complete and dense conductive network and a more efficient heat conduction network. The electrical and thermal conductivity of the TPU composite material have been greatly improved. promote.

Description

technical field [0001] The invention belongs to the technical field of polymer composite material synthesis, and in particular relates to a preparation method of an electrically conductive and thermally conductive functionalized carbon nanotube / TPU composite material. Background technique [0002] Thermoplastic polyurethane (TPU) is a block polymer composed of a soft soft segment and a rigid hard segment. The soft segment is composed of a polymeric polyol with a large molecular weight, and the hard segment is composed of a small molecule polyol and a diisocyanate. The unique block structure of TPU makes it show good wear resistance, oil resistance, toughness, acid resistance, alkali resistance, oxygen resistance and radiation resistance in the macroscopic aspect, and is widely used in the field of life and industry. However, TPU has poor thermal conductivity, and it will damage the product or even cause accidents due to the ineffective conduction and dissipation of heat duri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/48C08G18/32C08G18/64C08K9/04C08K9/02C08K3/04
CPCC08G18/3206C08G18/4854C08G18/6484C08G18/7671C08K9/02C08K9/08C08K2201/011C08K3/041
Inventor 郑玉婴张钊滟
Owner FUZHOU UNIV
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