The expansion graphite was discovered in the early 1960s. Many countries like to use it to study, so that many unexpected results can be achieved. The so -called expansion can be increased by more? That's right, more than double or even double! It is new carbon material! Many people don't know much about expansion graphite!

Graphite crystals are two -way large -molecular layer -like structures. The C atom in each plane is combined with the C -C co -price bond, and the layer is combined with weaker Van Dehua.

The layered structure of graphite is very typical. Each layer is a carbon atomic layer. The carbon atom in the layer is a strong covalent bond with SP2 hybrid orbit, that is, 1 2S electronics and 2 2P electronic hybridization, etc. The hybrid track of the price is located on the same plane and forms σ bonds each other, while the two unsteady 2P electrons are perpendicular to the plane to form a two -key π. This layered structure of graphite makes a certain gap between layers. Therefore, under certain conditions, the atoms (or single molecules) of certain reactions (such as acid, alkali, halogen) can enter the laminate gap and form a laminate compound with the carbon mesh plane.

This graphite with intervertebral compounds is expandable graphite. The carbon atomic layer is connected with a very weak Van Dehua force. This structure allows inserting substances to smoothly enter the hexagonal mesh structure of the carbon atomic layer without destroying the carbon atomic layer. Therefore The best maternal material. Explaining graphite is a method of inserting non -carbon reactors into the graphite layer with physical or chemical methods. While combining the hexagonal network plane of the carbon, it maintains a crystal compound of the graphite -like structure. It not only maintains the excellent graphite of the graphite, but also presents the new properties that the original graphite and inserted substances do not have due to the interaction between inserting the substance and the graphite layer. When the graphite inserted intervertebral compounds encounters high temperature, intervertebral compounds will decompose, generating a thrust in the direction of the C -axis direction in the graphite layer. The graphite layer was pushed open, which expanded the graphite particles high along the C -axis direction, forming a worm -like expansion graphite L2]. The graphite layer and the layer can be "embedded" into chemicals and have expansion. If sulfuric acid can be used to treat graphite, graphite expands at high temperature after drying, which is caused by the "embedded" molecule of sulfate into the graphite layer. However, from the existing literature, it can be found that expansion graphite is an excellent adsorption agent, especially it has a loose porous structure, and has a strong adsorption ability for organic compounds. It is designed as adsorption agents for various industrial oils and industrial oils.

Expansion graphite is easily adsorbed, organic molecules and hydrophobic substances, which are used for water environmental protection. It has an irreplaceable effect of other substances. When it is used in a granular form for oil removal, according to the size of the oil area and the type of oil on the water surface, its dosage is 1 to LO%/RN, and the adsorption time can vary from a few H.

The expansion graphite is a graphite of special use. Its chemical properties are very stable and corrosive is zero. Moreover, it can obstruct the burning coating and demand is very wide. At low temperature, graphite expands, and it can also swell at high temperature.