| abstract |
The invention relates to the field of new materials, in particular to a sealing composition used for online leakage testing of fluorine gas pipelines and a preparation method thereof. Chemical powder 2.5%-5%, calcium fluoride powder 5%-8%, air oxidation inhibitor 0.5%-3%, auxiliary agent 2%-4%. In the present invention, calcium fluoride, iodide, etc. are added to the fluoroplastic polytetrafluoroethylene. When the fluorine gas leaks on the sealing surface, the fluorine gas can oxidize the iodine ions to the iodine element, so that the sealing material shows red, and the leakage problem can be found in time. and locate leaks. In addition, in order to prevent misjudgment caused by iodide being oxidized by air to generate iodine, the invention adds an air oxidation inhibitor to the formula, which can also provide an alkaline environment to inhibit the oxidation of iodide ions and prevent misjudgment; The material for air duct sealing also has a leak detection function. |