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Method for promoting dispersion of nanofiller by utilizing stretching effect of pore wall of polymer foam material

A nano-filler and foaming material technology, which is applied in the field of polymer nanocomposite material preparation, can solve the problems of easily damaged filler morphology, complicated operation, and reduced filler performance, so as to improve physical and chemical properties, avoid complicated operation, and improve quality effect

Active Publication Date: 2021-07-23
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems that the existing methods for promoting the dispersion of fillers in the polymer matrix are easy to destroy the morphology and structure of the fillers, reduce the performance of the fillers, complicate the operation, and have limited environmental protection, the present invention provides a method that utilizes the stretching effect of the pore wall of the polymer foam material A method to promote the dispersion of nanofillers, to promote the dispersion of nanofillers in polymer matrix without destroying the morphology of filled nanomaterials, without reducing the performance of nanofillers, simplifying operations and increasing environmental protection, and effectively improving polymer nanocomposites performance

Method used

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  • Method for promoting dispersion of nanofiller by utilizing stretching effect of pore wall of polymer foam material
  • Method for promoting dispersion of nanofiller by utilizing stretching effect of pore wall of polymer foam material
  • Method for promoting dispersion of nanofiller by utilizing stretching effect of pore wall of polymer foam material

Examples

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Effect test

Embodiment 1

[0033] In this example, a method for promoting the dispersion of nanofillers by stretching the pore walls of polymer foam materials is provided to prepare CNF / PVDF nanocomposites with uniformly dispersed carbon-based conductive fillers and characterize their dielectric properties. The steps are as follows:

[0034] (1) Preparation of CNF / PVDF premix

[0035] ① Dry the carbon nanofiber (CNF) in vacuum at 80°C for 12 hours, and dry the polyvinylidene fluoride (PVDF) pellets in vacuum at 80°C for 4 hours;

[0036] ②Put the dried CNF and PVDF pellets into an internal mixer, and melt blend them for 90s at 200°C with a rotor speed of 50rpm (prolonging the melt blending time will lead to a significant decrease in the aspect ratio of CNF) to obtain CNF / PVDF premixture, the content of CNF in the premixture is 0.8wt%.

[0037] (2) Foaming

[0038] The CNF / PVDF premix was hot-pressed at 200°C to prepare a plate-shaped green body. The length and width of the green body were 13 mm and t...

Embodiment 2

[0049] In this example, a method for promoting the dispersion of nano fillers by using the stretching effect of the pore wall of the polymer foam material is provided to prepare a CNF / PVDF nanocomposite material with uniformly dispersed carbon-based conductive fillers and characterize its thermal conductivity. The steps are as follows:

[0050] (1) Preparation of CNF / PVDF premix

[0051] ① Vacuum-dry CNF at 80°C for 12 hours, and vacuum-dry PVDF pellets at 80°C for 4 hours;

[0052] ②Put the dried CNF and PVDF pellets into an internal mixer, and melt blend them for 90s at 200°C with a rotor speed of 50rpm to obtain a CNF / PVDF premix. The content of CNF in the premix is ​​10wt% .

[0053] (2) Foaming

[0054] The CNF / PVDF premix was hot-pressed at 200°C to prepare a plate-shaped green body. The length and width of the green body were 13 mm and the thickness was 3.5 mm. Raise the temperature of the molding and foaming equipment to 168°C, put the green body into the mold cavit...

Embodiment 3

[0063] In this embodiment, a method for promoting the dispersion of nanofillers by stretching the pore wall of the polymer foam material is provided, and the CNF / TPU nanocomposite material with uniformly dispersed nanofillers is used for SEM characterization of the dispersion behavior of CNF. The steps are as follows:

[0064] (1) Preparation of CNF / TPU premix

[0065] ① Vacuum dry CNF at 80°C for 12 hours, and vacuum dry TPU pellets at 80°C for 4 hours;

[0066] ②Put the dried CNF and TPU pellets into an internal mixer, and melt blend them for 90s at 180°C with a rotor speed of 50rpm to obtain a CNF / TPU premix. The content of CNF in the premix is ​​8wt% .

[0067] (2) Foaming

[0068] The CNF / TPU premix was hot-pressed at 200° C. to prepare a plate-shaped green body. The length and width of the green body were 13 mm and the thickness was 3.5 mm. Raise the temperature of the molding and foaming equipment to 180°C, put the green body into the mold cavity, inject carbon dioxi...

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Abstract

The invention provides a method for promoting dispersion of nanofiller by utilizing a polymer foam material pore wall stretching effect, which comprises the following steps: carrying out hot press molding on a polymer / nanofiller premix to form a green body, placing the green body in a high-pressure cavity, introducing gas serving as a foaming agent into the high-pressure cavity to swell and permeate the green body, and carrying out high-pressure foaming on the green body; then foaming to form a honeycomb-shaped foam hole structure, in the foaming process, dispersing the nano-filler in the blank is mutually due to the stretching effect of the foam hole wall growth process, breaking the agglomeration structure of the nano-filler, and the obtaining foam material with the nano-filler dispersed and distributed on the foam hole wall; and performing hot pressing to remove a foam structure in the foam material to obtain the polymer nano composite material in which the nano filler is uniformly dispersed in the matrix. According to the invention, the dispersion of the nanofiller in the matrix can be promoted on the basis of not destroying the morphology of the nanofiller, not reducing the performance of the nanofiller, simplifying the operation and increasing the environmental protection property, and the performance of the polymer nanocomposite is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of polymer nanocomposite materials, and relates to the dispersion technology of nano functional fillers in polymer nanocomposite materials, in particular to a method for promoting the dispersion of nanometer fillers by utilizing the stretching effect of the pore wall of polymer foam materials Background technique [0002] Polymer materials have the advantages of light weight, flexibility, and corrosion resistance, and are widely used in many fields. At the same time, carbon nanomaterials with different morphological structures are often added to the polymer matrix as functional fillers, such as zero-dimensional (0D) carbon black (CB), one-dimensional (1D) carbon nanotubes (CNT) and Two-dimensional (2D) graphene (GNS)), etc., these functional fillers can significantly improve the physical and chemical properties of polymer materials, making polymer nanocomposites widely used as smart sensing ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/12C08L27/16C08L75/04C08K7/06C08K3/04
CPCC08J9/122C08J9/0085C08J9/0066C08J2203/06C08J2327/16C08J2375/04
Inventor 龚鹏剑马昊宇吴冰洁翟硕牛艳华李光宪
Owner SICHUAN UNIV
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