High molecular derivatives composite material used for absorbing and storing methane, and its preparing method
A composite material and polymer technology, applied in the field of polymer-derived silicon-carbon composite materials, can solve the problems of increased construction investment and operating costs, strict material requirements, and high manufacturing costs of high-pressure vessels
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preparation example Construction
[0023] The main steps of the preparation method provided by the present invention are: fully hydrolyzing and emulsifying the organosilicon compound in alkaline distilled water and in the presence of a surfactant, and then obtaining the polymer-silicon-hybridized precursor by suspension polymerization of vinylidene chloride body. After the precursor is washed and dried, it is gradually carbonized under an inert atmosphere to obtain the desired composite material for methane adsorption, which can also be further processed by crushing.
[0024] In this method, the organosilicon compound is preferably tetraethyl orthosilicate or triethoxyethylene silane; the surfactant is preferably cetyltrimethylammonium chloride; the dispersant is preferably bis(2-amino Ethyl) a copolymer of ethylenediamine and epichlorohydrin, or bentonite; the initiator is preferably azobisisoheptanonitrile, and the polymerization reaction temperature is preferably 40-45°C. The hydrolysis and emulsification t...
Embodiment 1
[0029] At 35°C, dissolve 1.44g of cetyltrimethylammonium chloride and 0.754g of sodium hydroxide in 80ml of distilled water, then add 6.0g of tetraethyl orthosilicate under stirring, and at 45°C Stirring was continued for 5 hours, then cooled to 20°C. To this mixture was quickly added 20 ml of vinylidene chloride dissolved in 1.5% (molar ratio) of azobisisoheptanonitrile. 2.0 g of a copolymer of bis(2-aminoethyl)ethylenediamine and epichlorohydrin was added with stirring to make the polymer into a regular spherical shape. Stir continuously at 40° C. for 15 hours, filter, wash with a large amount of distilled water, and dry to obtain a spherical silicon-carbon polymer precursor. The obtained precursor was heat-treated in a quartz tube at 180° C. under the protection of argon, and the hydrogen and chlorine elements in the precursor were removed in the form of HCl. After this treatment is completed, the material turns into black pellets, and then the temperature of the quartz t...
Embodiment 2
[0032] At 35°C, dissolve 1.5g of cetyltrimethylammonium chloride and 0.80g of sodium hydroxide in 80ml of distilled water, then add 5.0g of triethoxyethylene silane under stirring, at 35°C Stirring was continued for 5 hours, then cooled to 20°C. To this mixture was quickly added 25 ml of vinylidene chloride dissolved in 1.5% (molar ratio) of azobisisoheptanonitrile. 4.5 g of bentonite was added as a dispersant under stirring. Stir continuously at 40° C. for 15 hours, filter, wash with a large amount of distilled water, and dry to obtain a spherical silicon-carbon polymer precursor. The obtained precursor was heat-treated in a quartz tube at 180° C. under the protection of argon, and the hydrogen and chlorine elements in the precursor were removed in the form of HCl. After this treatment is completed, the material turns into black pellets, and then the temperature of the quartz tube is raised to 1000°C at a heating rate of 2°C / min. And heat treatment with a mixture of argon ...
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Abstract
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