Expanded graphite is an important environmental material
Expanded graphite is not only widely used in industry, but also in the field of environmental protection. Expanded graphite's own product characteristics and advantages make it an important environmental material, in the environmental protection plays a huge role. A lot of people call it an important green materials, today's graphite small series for everyone to analyze why the expansion of graphite is an important environmental materials:
Expanded graphite because of its good adsorption capacity is used as an adsorption material, the expansion of graphite adsorption capacity is mainly used in two areas: adsorption of heavy oil and other oil substances and the absorption of harmful gases.
First, the expansion of graphite can absorb heavy oil and other oil substances.
Expanded graphite is an excellent adsorbent, especially it has a loose porous structure, the organic compounds with a strong adsorption capacity, 1g of expanded graphite can absorb 80g of oil, so the expansion of graphite was designed as a variety of industrial oils and industrial oil Of the adsorbent.
1, expanded graphite as a new type of adsorbent due to the large internal mesh.
Different from other materials of the adsorbent, expanded graphite internal molecules to the main hole, and most of the connected state, the inter-layer network connectivity is better. For the adsorption of heavy oil of this organic macromolecule has a very good effect. Heavy oil molecules are easy to enter and quickly spread in their network system until they are full of connected internal holes. Therefore, the expansion of graphite adsorption effect is better.
2, expanded graphite as a new type of adsorbent due to the analysis of surface pores are more.
The expansion of graphite worms and worms between the teeth, the formation of surface holes are more conducive to the adsorption of macromolecular substances, showing a large amount of adsorption, which can solve the oil, organic non-polar substances.
Second, the expansion of graphite can adsorb SO and other harmful gases.
Expanded graphite also has obvious adsorption effect on SO gas. The adsorption effect is closely related to the temperature, and the adsorption effect in the high temperature state is more remarkable. At low temperature, the adsorption of SO on the expansion of graphite to the main physical adsorption, high temperature, the chemical adsorption greatly increased, so the high temperature adsorption effect is also playing to enhance.
Expanded graphite is the most commonly used in the industry of fire protection materials, expanded graphite fire effect is very significant, and cost-effective, no side effects. In the daily industrial applications, many customers attach great importance to how to match the expansion of graphite in order to achieve the best flame retardant effect, today, Shengda graphite small series for everyone to talk about the impact of expansion of graphite flame retardant factors:
First, the impact of the amount of expanded graphite on the flame retardant properties.
When the amount of expanded graphite is less than 6%, the effect of expanded graphite on the flame retardant effect of the fire retardant coating is obviously increased. However, when the amount of expanded graphite is more than 6%, the flame retardancy is increased slowly or even without increasing, so the optimum amount of expanded graphite in fireproof coating is 6%.
Second, the impact of expanded graphite particle size on the flame retardant properties.
The granularity of expanded graphite is an important indicator of its basic performance, and its particle size is closely related to its synergistic flame retardancy. The smaller the particle size of the expanded graphite, the longer the refractory coating fire resistance, the better the flame retardant performance. This may be due to the fact that the expanded graphite, which is smaller in particle size, is more evenly dispersed in the coating system and the expansion is more effective in the case of the same amount of addition; and because the size of the expanded graphite is reduced, the oxidant enclosed between the graphite layers Subject to thermal shock more easily separated from the sheet, increasing the expansion rate. Therefore, the small diameter of the expanded graphite fire better performance.