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Method for preparing open cell type phenolic resin based foam carbon by one-step process

A technology of phenolic resin and foam carbon, which is applied in the field of preparation and preparation of phenolic resin-based open-cell foam carbon, which can solve problems such as cracking, difficult structure control, and long preparation time, and achieve simple process operation, shrinkage, and process time. short effect

Active Publication Date: 2009-05-27
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the 1960s and 1970s, researchers have made preliminary research on phenolic resin foam carbon, but there are generally a series of problems such as long preparation time, large shrinkage of resin during carbonization, serious cracking problems, and difficulty in obtaining complete products. Many problems lead to the structure of the product is not dense, the structure is not easy to control, the strength is low and far from meeting the application requirements
The above problems or defects limit the further application of phenolic resin-based foamed carbon to a large extent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: At normal temperature and normal pressure, first 100g thermoplastic phenolic resin, 8g hexamethylenetetramine, 5g NaHCO 3 Grind to 150 mesh with a grinder, stir and mix well. At room temperature, the mixed powder was dispersed for 30 minutes by ultrasonic waves. Put the mixed powder after the ultrasonic dispersion treatment into the mold made of the electrode material, press with a small press at a preset pressure of 1MPa for 30 minutes, and then fix the mold with a clamp. Finally, put the mold fixed by the fixture into a high-temperature carbonization furnace, pass in nitrogen gas, and heat it to 800°C with a heating rate of 1°C / min. Solidify, foam and carbonize in one step to obtain a density of 0.25g / cm 3 phenolic resin-based carbon foam.

Embodiment 2

[0021] Embodiment 2: At normal temperature and normal pressure, first 100g thermoplastic phenolic resin, 15g hexamethylenetetramine, 8g NaHCO 3 Grind to 200 mesh with a grinder, stir and mix well. At normal temperature, the mixed powder was dispersed for 20 minutes by ultrasonic wave. Put the mixed powder after the ultrasonic dispersion treatment into the mold made of the electrode material, press it with a small press at a preset pressure of 2 MPa for 40 minutes, and then fix the mold with a clamp. Finally, put the mold fixed by the fixture into a high-temperature carbonization furnace, pass in nitrogen gas, and heat it to 800°C with a heating rate of 1.5°C / min. Solidify, foam and carbonize in one step to obtain a density of 0.30g / cm 3 phenolic resin-based carbon foam.

Embodiment 3

[0022] Embodiment 3: At normal temperature and normal pressure, first 100g thermoplastic phenolic resin, 10g hexamethylenetetramine, 10gKHCO 3 Grind to 250 mesh with a grinder, stir and mix well. At room temperature, the mixed powder was dispersed for 30 minutes by ultrasonic waves. Put the mixed powder after the ultrasonic dispersion treatment into the mold made of the electrode material, press it with a small press at a preset pressure of 2 MPa for 40 minutes, and then fix the mold with a clamp. Finally, put the mold fixed by the fixture into a high-temperature carbonization furnace, pass in nitrogen gas, and heat it to 800°C with a heating rate of 2°C / min to solidify, foam and carbonize in one step to obtain a density of 0.40g / cm 3 phenolic resin-based carbon foam.

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Abstract

The invention discloses a preparation method for forming open-cell phenolic resin based carbon foam by a one-step method. Key points of the method comprise the following steps: a thermoplastic phenolic resin, hexamethylenetetramine and a foaming agent are mixed evenly under normal temperature, then are carefully loaded into a mould made of a carbon electrode material, and are subjected to cold compression premolding under certain pressure, and then the mould is well fixed by a fixture. Under normal pressure, the mold which is well fixed and is loaded with a sample is placed into a carbonization furnace and is increased to be 800 DEG C according to certain temperature program to be foamed, solidified and carbonized to obtain the open-cell phenolic resin based carbon foam.

Description

[0001] Field [0002] The invention belongs to the preparation of a foamed carbon, in particular to a preparation and a preparation method of a phenolic resin-based open-cell foamed carbon. Background technique [0003] Foamed carbon has been developed and applied rapidly since it was first produced by polymer pyrolysis and carbonization by American Walter Ford in 1964. Wide application prospects. In addition, foamed carbon has great development and utilization potential in energy storage materials, stealth materials, nuclear protection materials, catalyst supports, high-energy electrodes, etc. This special new type of porous carbon material has small and interpenetrating pores, large specific surface area, adjustable density and performance, and has unique properties in acoustics, optics, electricity, heat and dynamics. Great attention. [0004] Phenolic foam with independent microporous structure and excellent heat insulation and thermal insulation properties is the matri...

Claims

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Application Information

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IPC IPC(8): C01B31/02
Inventor 郭全贵雷世文史景利刘朗宋进仁翟更太
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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