3results about "Magnesium fluorides" patented technology

The application discloses a closed loop process for synchronously increasing the value of silicon and fluorine components in silicon tetrafluoride, and belongs to the technical field of fluorine-containing silicon byproduct resource utilization. The steps are as follows: 1) mixing anhydrous alcohol with triethylamine, and introducing silicon tetrafluoride gas at 0-30 DEG C to generate alkyl orthosilicate and triethylamine monohydrofluoride; 2) distilling the reaction liquid to recover alcohol, performing vacuum rectification to obtain alkyl orthosilicate product, and separating to obtain triethylamine monohydrofluoride; 3) adding triethylamine monohydrofluoride into water, and performing heating reflux reaction with inorganic alkali or basic oxide to separate to obtain triethylamine crude product and fluorinated metal salt; 4) after dehydration rectification, the triethylamine crude product is recycled to step 1) with recovered alcohol; and the fluorinated metal salt is post-treated to obtain high-purity fluorinated metal salt. The process has low reaction temperature, high alkyl orthosilicate yield, recyclable triethylamine, all fluorine solidified into high-value-added products, no three-waste emissions, and can be continuously industrialized.

This invention provides magnesium fluoride nanomaterials and their preparation method. The preparation method includes: adding hydrofluoric acid solution in batches to a magnesium salt solution, and reacting at a temperature of 10-70°C to obtain magnesium fluoride nanomaterials. The preparation method provided by this invention uses hydrofluoric acid as the fluorine source, which can produce magnesium fluoride nanomaterials with excellent sphericity. Furthermore, the preparation method has mild reaction conditions, is simple to operate, and is suitable for industrial production. In some preferred embodiments, by controlling the reaction conditions, magnesium fluoride nanomaterials with good sphericity, dispersibility, uniformity, and relatively large particle size can be obtained.

The present invention relates to an optical member comprising a substrate and a multilayer film, wherein the multilayer film has a fluoride film and a film having a refractive index different from that of the fluoride film, the fluoride film contains a rare earth element or an alkaline earth metal element, and the fluoride film has a measured band gap value Egm that is not greater than a prescribed proportion relative to a theoretical band gap value Egc.