Expandable graphite flame retardant plastic

Expandable graphite is a kind of graphite interlayer compound obtained from natural flake graphite after chemical oxidation or electrochemical oxidation. In terms of structure, eg is a nanocomposite material. When the eg prepared by the oxidation of ordinary H2SO4 is subjected to a high temperature above 200 ℃, the redox reaction occurs between sulfuric acid and graphite carbon atoms, producing a large amount of SO2, CO2, and water vapor, which makes the eg start to expand and reach the maximum volume at 1100 ℃, and its final volume can reach 280 times of the initial volume. This characteristic enables eg to extinguish the flame through the instantaneous increase of volume in case of fire.

The flame retardant mechanism of expandable graphite belongs to the solidification phase flame retardant mechanism, which is flame retardant by delaying or interrupting the generation of combustible substances from solid substances. Expandable graphite will begin to expand when heated to a certain extent, and the expanded graphite will change from the original flake shape to the worm shape with low density, to form a good thermal insulation layer. The expanded graphite sheet is not only the carbon source in the expansion system but also the thermal insulation layer, which can effectively insulate and delay and terminate the decomposition of polymer; At the same time, a large amount of heat is absorbed in the expansion process, which reduces the system temperature; Moreover, during the expansion process, the acid radical ions in the interlayer are released to promote dehydration and carbonization.

As a halogen-free environment-friendly flame retardant, expandable graphite has the following advantages: non-toxic, no toxic, and corrosive gas will be generated when heated, and little flue gas will be generated; Small addition; No dripping; Strong environmental adaptability and no migration; Good UV stability and light stability; Sufficient sources and simple manufacturing process. Therefore, expandable graphite has been widely used in various flame retardant and fireproof materials, such as fire sealing strips, fireboard, fire, and anti-static coating, fire bags, plastic fire blocking material, fire ring, and flame retardant plastics.

Franli provides high-quality expandable graphite with good expansion performance, strong adsorption, and strong flame retardancy. We have provided expandable graphite to many countries in the world, which has been widely praised for its application in various industries. If you have any needs, please do not hesitate to contact us.