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8147results about "Silica" patented technology

Method for preparing silicon dioxide silica aerogel composite material by drying in atmosphere pressure

The invention discloses a method for preparing a silicon dioxide aerogel composite material at the condition of normal pressure and drying, which comprises the steps as following: (1) silicon dioxide sol and a reinforcing material are compounded and placed statically to form plural gel, and then ageing treatment is carried out to the plural gel; (2) a modifying agent is used for the hydrophobic modification of the aged plural gel, and then ambient pressure drying is carried out for the modified plural gel to obtain the silicon dioxide aerogel composite material at the condition of normal pressure and drying. The silicon dioxide aerogel composite material prepared by the method of the invention has extremely low coefficient of heat conductivity, which greatly increases the added value of the reinforcing materials such as corpus fibrosum, the product can be widely applied to thermal insulation and sound insulation of buildings, thermal insulation and sound insulation in the industrial pipeline transportation, and the like, and expands the application field of silicon dioxide and the corpus fibrosum.
Owner:绍兴纳诺气凝胶新材料研发中心有限公司 +2

Silicon dioxide aerogel material and preparation method thereof

The invention relates to a silicon dioxide aerogel material and a preparation method thereof. The method comprises the following steps: by using water glass as silicon source, adding an acid-containing organic solvent free of chlorine ions and fluorine ions to generate a precipitate of sodium ions, potassium ions and other metal salt ions, filtering to remove the precipitate to obtain high-purity silica sol, carrying out a sol-gel process, aging, acidifying, modifying, and drying to obtain the silicon dioxide aerogel material. The acidification before modification enhances the surface reaction activity of the silicon gel, thereby obviously enhancing the modification effect and efficiency. The method has the advantages of low cost and simple and efficient technique, is beneficial to mass high-efficiency production, is free of chlorine ions and fluorine ions in the whole technical process, and enhances the equipment operation safety and reliability; and the product can be used for heat preservation and thermal insulation of nuclear power and liquefied natural gas equipment and pipelines with higher requirement for corrosion resistance, and can also be used for thermal insulation in the field of aerospace, petrochemical engineering, track transportation, ships, automobiles, construction and the like.
Owner:浙江圣润纳米科技有限公司

Method for preparing super-hydrophobic silica aerogel at normal pressure

The invention discloses a method for preparing super-hydrophobic silica aerogel at the normal pressure by taking an inorganic silicon source or an organic silicon source as a raw material. The method comprises the following steps: taking the inorganic silicon source or the organic silicon source as the raw material, then mixing the raw material with a solvent and a catalyst, and obtaining wet gel through a process of sol-gel, and then carrying out ageing, solvent replacement, surface modification and ambient pressure drying on the obtained wet gel to obtain the silica aerogel with low-density, high specific table and super hydrophobicity. The invention realizes the ambient pressure drying of the wet gel, avoids the equipment investment when the conventional supercritical drying is adopted, greatly improves the safety of the production, has simple operation, good properties and controllability of the products, and is suitable for large-scale production.
Owner:DALIAN UNIV OF TECH
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