Expanded graphite has good flame retardancy, so it has become a commonly used fireproof material in the industry. In daily industrial applications, the industrial ratio of expanded graphite affects the effect of flame retardancy, and correct operation can achieve the best flame retardancy effect. Today, the editor of Furuite graphite will talk about the flame retardancy of expanded graphite in detail:
1. The effect of expanded graphite particle size on flame retardant properties.
The particle size of expanded graphite is an important indicator to characterize its basic properties, and its particle size is closely related to its synergistic flame retardant performance. The smaller the particle size of the expanded graphite, the longer the fire resistance of the fire retardant coating, and the better the flame retardant performance. This may be because the expanded graphite with smaller particle size is more uniformly dispersed in the coating system, and the expansion effect is more effective under the same amount of addition; the second is because when the size of the expanded graphite decreases, the oxidant enclosed between the graphite sheets is It is easier to detach from between the sheets when subjected to thermal shock, increasing the expansion ratio. Therefore, expanded graphite with smaller particle size has better fire resistance.
2. the influence of the amount of expanded graphite added on the flame retardant properties.
When the amount of expanded graphite added is less than 6%, the effect of expanded graphite on improving the flame retardant of fire retardant coatings is obvious, and the increase is basically linear. However, when the amount of expanded graphite added is more than 6%, the flame retardant time increases slowly, or even does not increase, so the most suitable amount of expanded graphite in the fireproof coating is 6%.
3. The influence of the curing time of expanded graphite on the flame retardant properties.
With the extension of the curing time, the drying time of the coating is also prolonged, and the remaining volatile components in the coating are reduced, that is, the flammable components in the coating are reduced, and the flame retardant and fire resistance time is prolonged. The curing time depends on the properties of the coating itself, and has nothing to do with the properties of the expanded graphite itself. A certain curing time is necessary when using fire-retardant coatings in practical applications. If the curing time is insufficient after the steel parts are painted with fire-retardant coatings, it will affect its inherent fire retardant. performance, so that the fire performance is reduced, causing serious consequences.
Expanded graphite, as a physical expansion filler, expands and absorbs a lot of heat after heating to its initial expansion temperature, which can significantly reduce the system temperature and significantly improve the fireproof performance of the fireproof coating.
Post time: Sep-21-2022