Time：2023.04.19Browse：1
In recent years, various types of low -density carbon graphite materials have been actively researched, including carbon (graphite) foam made of asphalt or polymer resin, as well as using high repetition pulse laser to abolish carbon materials The carbon nano foam formed. Granny Gygm is also a low -density carbon graphite material. Due to the simple preparation process and low production cost, it is convenient for large -scale industrialized production. In recent years, the research on expandable graphite has continued to deepen. The following editor of Jinhui Graphite Company introduced the method of soaking flexible graphite in the concentrated acid into a low -density puffed graphite block:
The insect shape and weak macro structure of puffed graphite restrict their application. If it can be made into a stable -swollen graphite block, it will be conducive to puffed graphite to play its role as adsorption, heat insulation, heat conduction and other functional materials. The flame retardant sealing made of expansion graphite can be used for building components, such as fire doors, fire windows, fire -resistant glass walls, fire valve, fire shutter windows, etc. When studying the flame retardant sealing parts of the puff, the author found that the flexible graphite paper or flexible graphite board had a good puffing performance at high temperatures. By controlling the appropriate puffed conditions, the shape of the puffed graphite can be obtained. This article mainly reports the results of the research on the preparation of puffed fossil blocks with flexible graphite. The thickness of the flexible graphite is 0.40 mm 0.02 mm, and the average accumulation density is 1.43 grams -3. Flexible graphite board, with a thickness of 1.20 mm 0.04 mm and average volume density.
Soak the flexible graphite (plate) in concentrated sulfuric acid or concentrated nitric acid, and then pose at 200 ~ 750, which is made of low density to expand graphite blocks. The effects of interpolation agents, interpolation time, and bulk temperature on the volume density and shape integrity of expandable graphite blocks were studied. The results show that the higher the patch temperature, the lower the density of the puffed graphite block, the more difficult it is to get the complete shape. When concentrated sulfuric acid or thick nitric acid is inserted, the appropriate swelling temperature is about 550.
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2023-04-19
