Application of Expandable Graphite (II)
Fire sealing strip: Due to the expandability and high temperature resistance of expandable graphite, it has become an excellent sealing material and is widely used in fire sealing strips. There are mainly two forms: the first is to mix, vulcanize, and shape expandable graphite materials with rubber materials, inorganic flame retardants, accelerators, vulcanizing agents, reinforcing agents, fillers, etc. to produce various specifications of expansion sealing strips, mainly used for fire doors, fire resistant glass windows, and other fields. This expansion sealing strip can play a role in blocking the flow of smoke from beginning to end at room temperature and in fires; Another method is to use fiberglass tape as a carrier to bond expandable graphite to the carrier with a certain adhesive. The carbonized material formed by this adhesive at high temperatures provides shear resistance that can effectively prevent the sliding of graphite. It is mainly used for fire doors, but it cannot effectively block the flow of cold smoke at room or low temperatures, so it must be used in conjunction with room temperature sealing agents.
Flame retardancy of plastic materials: Expandable graphite is a good flame retardant for plastic materials, with non-toxic and pollution-free characteristics. It can achieve ideal flame retardancy when used alone or mixed with other flame retardants. When expandable graphite achieves the same flame retardant effect, the amount used is much smaller than that of ordinary flame retardants. Its working principle is that at high temperatures, expandable graphite rapidly expands, suffocating the flame, and the resulting expanded graphite material covers the surface of the substrate, isolating thermal radiation and oxygen contact. The acid radicals inside the interlayer are released during expansion, which also promotes the carbonization of the substrate, achieving good results through various flame retardant methods.
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Mr.Liu：+86-151 5322 2156
E-mail：15153222156@126.com
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