Method for modifying polytetrafluoroethylene-aramid blended fabric jointly by dopamine-polyethyleneimine-nanoparticles

A technology of polyethyleneimine and polytetrafluoroethylene, applied in textiles and papermaking, fiber type, fiber treatment, etc., can solve the problems of expensive experimental equipment, high reaction temperature, complex reaction conditions, etc., and achieve simple operation and excellent reaction conditions Gentle, efficient effect

Active Publication Date: 2020-02-21
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of these modification methods involve expensive experimental equipment, complex reaction conditions or high reaction temperature, so it is necessary to explore a simple and mild fiber surface modification method
In addition, due to the different surface properties of PTFE fibers and aramid fibers, it is required that the modification method used must be applicable to these two different fibers at the same time, while maintaining the original mechanical strength of the fibers. It poses a great challenge to the current common fiber modification methods

Method used

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  • Method for modifying polytetrafluoroethylene-aramid blended fabric jointly by dopamine-polyethyleneimine-nanoparticles
  • Method for modifying polytetrafluoroethylene-aramid blended fabric jointly by dopamine-polyethyleneimine-nanoparticles
  • Method for modifying polytetrafluoroethylene-aramid blended fabric jointly by dopamine-polyethyleneimine-nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take 1270 mg of polytetrafluoroethylene-aramid fiber blended fabric (3 cm × 12 cm), 120 mg of dopamine hydrochloride, 120 mg of polyethyleneimine, and 2 mg of carbon nanotubes, and add them to 60 mL of trimethylol-aminomethane / In a hydrochloric acid buffer solution (pH = 8.5, 20 mmol / L), stir and ultrasonically disperse evenly; then transfer the above mixed solution to an open flask, and continue to stir and react at room temperature for 8 h; after the reaction is completed, the blended The fabric was taken out, fully washed with deionized water to remove unreacted impurities on the surface, and then dried in a vacuum oven for 24 hours to obtain a polydopamine-polyethyleneimine-carbon nanotube hybrid functional coating modified polytetrafluoroethylene- Aramid blend fabric. The interfacial bonding strength between the modified PTFE-aramid blended fabric and the resin matrix is ​​4.4 (N / mm); the tensile strength is 590 (N).

Embodiment 2

[0029] Add 1270 mg of polytetrafluoroethylene-aramid blended fabric (3 cm × 12 cm), 120 mg of dopamine hydrochloride, 120 mg of polyethyleneimine, and 60 mg of silicon carbide nanoparticles into 60 mL of trimethylol-aminomethane / hydrochloric acid buffer solution (pH = 8.5, 20 mmol / L), stirring and ultrasonically dispersing evenly; then the above mixed solution was transferred to an open flask, and stirred continuously at room temperature for 8 h; after the reaction was completed, the The blended fabric was taken out, fully washed with deionized water to remove unreacted impurities on the surface, and then dried in a vacuum oven for 24 h to obtain a polydopamine-polyethyleneimine-nano-silicon carbide hybrid functional coating modified polytetrafluoroethylene Vinyl-aramid blend fabric. The interfacial bonding strength between the modified PTFE-aramid blended fabric and the resin matrix is ​​4.2 (N / mm); the tensile strength is 605 (N).

Embodiment 3

[0031]Add 1270 mg of polytetrafluoroethylene-aramid blended fabric (3 cm × 12 cm), 180 mg of dopamine hydrochloride, 180 mg of polyethyleneimine, and 180 mg of zinc oxide nanoparticles into 60 mL of trimethylol-aminomethane / hydrochloric acid buffer solution (pH = 8.5, 20 mmol / L), stirring, and ultrasonic dispersion; then transfer the above mixed solution to an open flask, and continue to stir and react at room temperature for 12 h; after the reaction is completed, put The blended fabric was taken out, fully washed with deionized water to remove unreacted impurities on the surface, and then dried in a vacuum oven for 24 h to obtain a polydopamine-polyethyleneimine-nanometer zinc oxide hybrid functional coating modified polytetrafluoroethylene Vinyl-aramid blend fabric. The interfacial bonding strength between the modified PTFE-aramid blended fabric and the resin matrix is ​​4.16 (N / mm); the tensile strength is 611 (N).

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Abstract

The invention discloses a method for modifying polytetrafluoroethylene-aramid blended fabric jointly by dopamine-polyethyleneimine-nanoparticles; the method includes: adding polytetrafluoroethylene-aramid blended fabric, dopamine hydrochloride, polyethylenimine and nanoparticles into trihydroxymethyl-aminomethane/hydrochloride buffered solution, stirring, ultrasonically dispersing well, and continuously stirring at room temperature to allow for 2-24 h of reaction; after the reaction, taking out the blended fabric, sufficiently washing with deionized water to remove unreacted impurities on thesurface, and then drying in a vacuum oven to obtain the surface-modified polytetrafluoroethylene-aramid blended fabric. An organic-inorganic hybrid functional coating is constructed on the fiber surface through modifying; therefore, both active functional groups and greater surface roughness are imparted to the surface of the blended fabric, and the interface adhesion performance between the blended fabric and phenolic resin matrix can be improved through chemical bonding and mechanical interlocking.

Description

technical field [0001] The invention relates to a method for surface modification of polytetrafluoroethylene-aramid blended fabrics, in particular to a method for jointly modifying polytetrafluoroethylene-aramid blended fabrics with dopamine-polyethyleneimine-nanoparticles, which belongs to nanomaterials And the field of fiber surface modification technology. Background technique [0002] Fiber-reinforced polymer matrix composites have the advantages of light weight, high strength, outstanding fatigue resistance, corrosion resistance, and excellent designability, so they are widely used in high-end manufacturing fields such as aerospace, automobiles, and weaponry. Among them, blended fabrics have attracted more and more researchers' attention due to the introduction of different types of fibers in the weaving process, which makes them have the advantages of different fibers. At present, the blended fabric material made of polytetrafluoroethylene fiber as the lubricating pha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M15/61D06M15/37D06M11/74D06M11/77D06M11/44D06M11/79C08G73/06D06M101/22D06M101/36
CPCC08G73/0672D06M11/44D06M11/74D06M11/77D06M11/79D06M15/37D06M15/61D06M2101/22D06M2101/36
Inventor 袁军亚张招柱杨明明姜葳赵鑫
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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