Method for preparing carbon foam using aryl ethyne monomer

Abstract

The invention discloses a method for preparing carbon foam by using aryl acetylene monomer, relating to the preparation technology of carbon foam. First, the aryl acetylene monomer with a purity of 90-94% or more and a mass ratio of m-phenylene acetylene and p-phenylene acetylene of 5:2 is selected as a raw material. Then add foaming agent n-pentane and foam stabilizer Tween 80 in proportion, heat up and stir, add curing agent sulfuric acid dropwise, continue stirring at constant temperature, foam during the curing process, and obtain partially cured foam. Then soak and clean the above-mentioned foam body with acetone solution to remove the foam stabilizer and curing agent therein. Then it was graded and completely cured: 120°C constant temperature drying for 2 hours, 150°C constant temperature drying for 2 hours, 180°C constant temperature drying for 2 hours, 200°C constant temperature drying for 2 hours, and post-treatment at 350°C for 4 hours in a nitrogen atmosphere to obtain polyarylene foam. Finally, the foam was heated from room temperature to 900°C at 10°C / min in a nitrogen atmosphere, kept at a constant temperature for 180 minutes to carbonize it, and then slowly lowered to room temperature to obtain carbon foam. The invention has the advantages of simple process and low equipment requirements, and at the same time solves the two problems of difficult control of the structure of the carbon foam product and poor mechanical properties.

Description

technical field [0001] The invention discloses a method for preparing carbon foam by using aryl acetylene monomer, relating to a preparation technology of carbon foam. Background technique [0002] Carbon foam is a light solid carbon material with carbon atoms as the skeleton and a porous network structure formed by stacking carbon atoms with each other. Its density ranges from 0.12 to 0.8 g cm -3 , The porosity is above 70%, of which open pores account for about 96%, and the diameter of the pores is more than ten nanometers to several hundred micrometers. Carbon foam has a series of remarkable physical properties such as its unique microstructure, large specific surface area, high porosity, excellent adsorption, low thermal expansion coefficient and good compression resistance. It is used in thermal control materials, It has broad application prospects in battery electrodes, supercapacitors, catalyst carriers, technical separation, aerospace and other fields. For example,...

AI Technical Summary

Problems solved by technology

[0004] Although the above-mentioned methods can obtain carbon foam, some methods have expensive raw materials and require high-pressure treatment, and the requirements for reaction equipment are high; some methods have very low yields and are difficult to carry out industrial production; application

In short, because the preparation of carbon foam has to overcome several difficulties such as cumbersome preparation process, uneasy control of product structure and poor mechanical properties, so far, no carbon foam preparation method with simple process, easy structure control and excellent product performance has been found at home and abroad.