Nitrogen-doped carbon foam prepared by carbonizing polyester and preparation method thereof

Abstract

The invention belongs to the technical field of nitrogen-doped carbon foam, and particularly relates to nitrogen-doped carbon foam prepared by carbonizing polyester and a preparation method of the nitrogen-doped carbon foam. The preparation method comprises the following steps: (1) uniformly mixing a polyester material, a cross-linking agent and molten salt to obtain a polyester and cross-linkingagent and molten salt mixture, wherein the cross-linking agent is a polyamino compound; and (2) heating the polyester and cross-linking agent and molten salt mixture to a carbonization temperature toobtain a carbonization product, and pickling the carbonization product to remove the molten salt, thereby obtaining the nitrogen-doped carbon foam. The introduction of the cross-linking agent promotesthe cross-linking reaction of polyester, the carbonization temperature is effectively reduced, the existence of the low-melting-point molten salt catalyst can eliminate part of weak chemical bonds inthe cross-linking structure to generate carbon dioxide, water vapor and other small molecular products, and the degradation products serve as the effect of an in-situ foaming agent, therefore, the utilization rate of polyester in the carbonization process is increased, and the method has great application potential in the aspect of recycling of waste polyester.

Description

technical field [0001] The invention belongs to the technical field of nitrogen-doped carbon foam, and more specifically relates to a nitrogen-doped carbon foam prepared by carbonizing polyester and a preparation method thereof. Background technique [0002] Carbon foam has the advantages of low density, high strength, high specific modulus, high thermal conductivity, low expansion coefficient, good friction performance, good impact resistance and stable size. The highest theoretical temperature of carbon foam is 2600°C, and it is one of the most promising high-temperature materials. The raw material for making carbon foam is generally polyester. As a common plastic in life, polyester is widely used in product packaging, such as beverage bottles. The carbon content in polyester is usually high, easy to recycle and extremely cheap and easy to obtain. Common methods for preparing carbon foams using polyester as a carbon source include supercritical method and template metho...

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Problems solved by technology

This solves the technical problems such as high carbonization temperature resulting in high energy consumption and complicated preparation process in the preparation of nitrogen-doped carbon foam by carbonization of existing polyester

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