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A preparation method of silane-modified graphene oxide flame-retardant film composite material

A flame-retardant film and silane modification technology, which is applied in the field of preparation of green flame-retardant organosilicon functionalized graphene film composite materials, can solve environmental pollution and other problems, improve physical properties, protect structural stability, and inhibit thermal degradation Effect

Active Publication Date: 2021-03-09
HANGZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problem that although elements such as nitrogen and phosphorus in modified graphene oxide have obvious flame-retardant effects, the gas released during the combustion process has certain pollution to the environment. The present invention proposes a silane-modified graphene oxide The preparation method of flame-retardant film composite material, the introduced silane coupling agent can modify the surface of graphene oxide sheet, effectively inhibit the thermal degradation of graphene oxide by flame, and obtain the graphene film material with stable structure after combustion

Method used

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  • A preparation method of silane-modified graphene oxide flame-retardant film composite material
  • A preparation method of silane-modified graphene oxide flame-retardant film composite material

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Embodiment 1

[0022] Take 120 mg graphene oxide and prepare 3 mg.mL -1 Uniformly dispersed aqueous solution, add 120 mg of silane coupling agent KH570 (γ-methacryloxypropyltrimethoxysilane) under stirring, magnetically stir for 1 h, ultrasonic for 10 min, and exhaust the air bubbles under vacuum. The above aqueous solution was reacted in an oven at 90 °C for 24 h under airtight conditions to obtain silanized graphene oxide hydrogel. The hydrogel was dried in air at 40°C for 24 h to form a film to obtain the silane-modified graphene oxide flame-retardant film composite material 1.

[0023] The obtained silane-modified graphene oxide flame-retardant film composite material 1 has good mechanical properties and can be bent; when the film is exposed to the flame of an alcohol lamp, the surface-modified silane molecules can effectively protect graphene oxide and significantly inhibit the graphite oxide thermal degradation of alkenes. Such as figure 1 As shown, the overall size of the film is b...

Embodiment 2

[0025] Take 120 mg graphene oxide and prepare 8 mg.mL -1 Uniformly dispersed aqueous solution, add 120 mg of silane coupling agent KH570 (γ-methacryloxypropyltrimethoxysilane) under stirring, magnetically stir for 1 h, ultrasonic for 10 min, and exhaust the air bubbles under vacuum. The above aqueous solution was reacted in an oven at 90 °C for 24 h under airtight conditions to obtain silanized graphene oxide hydrogel. The hydrogel was dried in air at 50 °C for 20 h to form a film, and the silane-modified graphene oxide flame-retardant film composite material 2 was obtained.

[0026] The obtained silane-modified graphene oxide flame-retardant film composite material 2 has good mechanical properties and can be bent; when the film is exposed to the flame of an alcohol lamp, the surface-modified silane molecules can effectively protect the graphene oxide and significantly inhibit the graphite oxide Thermal degradation of alkene; the overall size of the sample remains basically u...

Embodiment 3

[0028] Take 200 mg graphene oxide and prepare 1 mg.mL -1 To the uniformly dispersed aqueous solution, add 20 mg of silane coupling agent KH550 (γ-aminopropyltriethoxysilane) under stirring, magnetically stir for 1 h, ultrasonically for 10 min, and exhaust the air bubbles under vacuum. The above aqueous solution was reacted in an oven at 90 °C for 12 h under airtight conditions to obtain silanized graphene oxide hydrogel. The hydrogel was dried in air at 60 °C for 12 h to form a film, and the silane-modified graphene oxide flame-retardant film composite material 3 was obtained.

[0029] The obtained silane-modified graphene oxide flame-retardant film composite material 3 has good mechanical properties and can be bent; when the film is exposed to the flame of an alcohol lamp, the surface-modified silane molecules can effectively protect the graphene oxide and significantly inhibit the graphite oxide Thermal degradation of alkene; the overall size of the sample remains basically...

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Abstract

The invention relates to the technical field of organosilicon modified materials and provides a preparation method of a silane-modified graphene oxide (GO) flame-retardant film composite in order to solve the problem that gases released in a combustion process of modified GO result in certain environmental pollution although elements such as nitrogen and phosphorus in the modified GO have an obvious flame-retardant effect. The preparation method comprises the steps: adding a silane coupling agent into a GO water solution, carrying out uniform stirring, and carrying out a reaction under a 70-100 DEG C airtight condition for 8-24h to prepare organosilicon functionalized GO hydrogel; and then, placing the hydrogel into a 30-60 DEG C drying oven for drying at an air atmosphere for 12-36h to prepare an organosilicon functionalized GO film composite. The introduced silane coupling agent is capable of realizing surface modification of a graphene oxide sheet layer and effectively inhibiting the thermal degradation of a flame to GO, so that a graphene film material with a stable structure after combustion is obtained.

Description

technical field [0001] The method relates to the technical field of organosilicon modified materials, in particular to the preparation of a green flame-retardant organosilicon functionalized graphene film composite material. Background technique [0002] With its unique hexagonal honeycomb structure, graphene has excellent mechanical, electrical and thermal properties. Graphene oxide is a water-soluble suspension with a large number of functional groups on the surface obtained by oxidizing graphene. Because the surface is oxidized, there are obvious defects, which make its electrical and thermal conductivity weaker than that of graphene. The graphene oxide film is gradually carbonized under flame combustion, and the volume gradually shrinks until it is completely burned, and the flame retardant effect is poor. [0003] Due to the existence of a large number of oxygen-containing functional groups on the surface of graphene oxide (GO), grafting molecules with flame-retardant ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B30/00C04B111/28
CPCC04B30/00C04B2111/28C04B14/024
Inventor 汤龙程黄能俭赵丽张国栋徐辉强飞龚丽秀厉世能
Owner HANGZHOU NORMAL UNIVERSITY
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