Regarding phenolic resin-based carbonized functional materials, Shandong Shengquan Chemical Co., Ltd. recently studied carbon/carbon composite materials made of phenolic resin, graphite/phenolic carbon composite materials, activated carbon fibers, phenolic carbon foam materials, and carbon. Development and application of carbonized functional materials such as gas separation membranes, new power materials, glassy carbon, and wood ceramics. According to Chinese phenolic resin network experts, phenolic resin is a thermosetting resin. The cured resin structure has a three-dimensional network with high cross-linking characteristics. The main body of the structure is a large proportion of benzene rings. The elements are mainly carbon and the inter-atomic bond energy is high. The cohesive force between the molecular chains is large, so the phenolic resin has the characteristics of high residual carbon ratio and high carbon-forming structural strength after pyrolysis. Therefore, the phenolic resin is an ideal precursor (carbon precursor) substance for pyrolysis of carbonaceous materials. In order to obtain a high residual carbon ratio, the phenolic resin must be subjected to a high temperature of carbonized oxygen in an inert atmosphere, so that many carbon atoms are oxidized, resulting in a greatly reduced residual carbon ratio. The presence of oxygen also has many effects on the density, specific surface area, and aggregate state of the carbon residue structure.
Commonly used phenolic resin varieties are B-stage phenolic phenolic, aminophenol aldehyde, molybdenum phenolic and boron phenolic. According to Chinese phenolic resin network experts, there is also an aralkyl phenolic aldehyde (new phenolic resin), which is prepared by reacting phenol and p-phenylenediethanol (PXG) under the action of a catalyst. Due to the high activity of PXG, the synthesis conditions are Mild, this resin has good processability and a carbon residue rate of up to 70%.
Activated carbon fiber can be classified into viscose base, polyacrylonitrile base, asphalt base and phenolic base according to its raw material source. In 1966, Carbonmdum began to develop phenolic-based activated carbon fiber. In 1970, the output reached about 20 tons. The product trademark was Kynol. According to the introduction of China's phenolic resin network experts, Japan and the United States continued to develop phenolic-based activated carbon fiber. Now Japan has a large number of patent reports. China's Shanghai Textile Research Institute and the Chinese Academy of Sciences, Shanxi Institute of Coal Chemistry, also developed high-performance phenolic-based activated carbon fiber, there is no domestic commodity to enter the market.
The process of producing phenolic-based activated carbon fiber is as follows: firstly, a meltable Resole resin or a linear thermoplastic phenolic resin is melt-spun into a fiber and cross-linked and cured to obtain an amorphous, non-oriented phenolic fiber, and then subjected to a series of post-treatments. A phenolic based carbon fiber or a phenolic based activated carbon fiber can be obtained. The carbon fiber produced by "Kenoor" is a low-strength, low-model, but high-performance activated carbon fiber can be produced. According to Chinese phenolic resin network experts, for example, a linear phenolic fiber with an oxygen content of 15% is oxidized in air at 280 ° C for 30 min to increase its oxygen content to 24%; the pre-oxidized wire is then carbonized under nitrogen protection ( 300-800 ° C), carbon fiber is obtained; finally, activated carbon fiber is obtained by activation in water vapor at 900 ° C.
The basic requirements for the production of activated carbon fibers for adsorption are completely different from those for the production of reinforcing carbon fibers. The former should be made as porous as possible to have a porous structure, and the latter should eliminate pore cracks or voids as much as possible. According to China's phenolic resin network experts, the production principles and production equipment of the two are significantly different.
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