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Expandable graphite in the field of fire retardant mainly used in the following aspects:
1. fireproof sealing strip due to the expansion of expansion of the graphite resistance, heat resistance and heat insulation properties, making it a good sealing material, and widely used.
There are mainly two forms: The first one is the expandable graphite and rubber material, the inorganic flame retardant (aluminum hydroxide), accelerators, vulcanizing agents, reinforcing agents and the like were kneaded into the plastic made of various sizes the expandable sealing strip. Mainly used for fire doors, fire glass windows and other occasions. This seal throughout the barrier flue gas flow in the fire. Another is a glass fiber used as a carrier certain adhesives will be expanded graphite bonded to the carrier, it is mainly used in the manufacture of fire resistant doors.
2 fire package, fire blocking material, fire ring
Because expandable graphite having a high expansion ratio under high temperature conditions, can be made fire package, fire blocking material, and fire blocking as effective intumescent material used in the construction. Such as sealing building pipelines, cables, gas pipes fire to prevent the fire from spreading.
3 fire board
The density of the expandable graphite, crystal stability, a mix commonly used in the fire plate, aimed at increasing the fire performance of the sheet, reducing the density of the sheet material, and enhance the insulation performance. Developed into a sheet of expanded graphite is often used, this material can be used to produce wall and other combustible substrate retardant panel, in this application, the small size of the natural flake graphite particles can be used as starting material is directly pressed into boards, fire occurs, fine particles of graphite can be expanded to form a denser fire barrier layer.
4. Retardant paint
In recent years, the expandable graphite are trying applied in a fire-retardant coating, it can give coatings excellent in thermal expansion. The United States recently proposed a fiber reinforced material, expandable graphite, solid endothermic material, polymeric binder, and other components of the fire-retardant coating can be used for fiberboard, wood gutter coating. The paint to overcome the lack of smoke coatings are easy to produce in the past. Less the rapidly expands to form a lightweight carbon layer in the fire and release toxic gases (such as: SO2, NO, etc.). Effective fire protection of the substrate. But limit it to promote the use of black graphite surface. Surface modification to change its color, to increase paint color varieties, and their color can be accepted by the public, which is the focus of the research.
5. Retardant plastic
Expandable graphite carbon to form the expansion carbonized layer has excellent thermal insulation properties, high temperature resistance. Expandable graphite is found so far only can be used under harsh conditions and have sufficient strength of expansion expansion agent. Expandable Graphite retardant plastic use expandable graphite expansion and thermal insulation. Such as: the expansion of the role of graphite flakes dispersed in the polyurethane foam to prevent burning, weakened fire, also play a role in insulation.
Expandable Graphite