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Citation: WANG Shen-Min, ZHOU Qun, QIAO Ying-Jie. A New Technology for Preparation of Low-Surphur Expandable Graphite[J]. Chinese Journal of Applied Chemistry, ;2000, 17(1): 93-95. shu

A New Technology for Preparation of Low-Surphur Expandable Graphite

1.
College of Applied Science, Harbin University of Science and Technology, Harbin 150080

Received Date: 3 September 1999
Available Online: 17 December 1999
Fund Project: 黑龙江省自然科学基金项目和哈尔滨市学科后备带头人基金项目(9872218023) (9872218023)

A new technology including semisolid phase maceration for preparation of low surphur expandable graphite is presented, in which potassium permanganate and concentrated sulphuric acid are adopted as blended oxidants and ferric trichlo ride as an inserting agent. The optimum conditions of the process are as follows: mass ratio of graphite to sulfuric acid, potassium permang anate and ferric trichlo ride=1.0:3.0:0.8:0.2; reaction tem perature and time: 50℃ and 1 h. The expandable graphite has an expanded volume of 230 mL/g and S content of 0.48%. By treating the product with sucrose bo rate solution and heating the flexible graphite plates also have been obtained with tensile strength of 7.5 MPa and oxidation loss of 11%. It is a green technology.
- low-sulphur expandable graphite,
- preparation,
- sealing material
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