2 results about "White Phosphorus" patented technology

The application discloses a method for producing phosphorus pentafluoride by electrolysis. The method is to use white phosphorus and anhydrous hydrogen fluoride as raw materials, fluorometal salt or quaternary ammonium fluoride salt as conductive agent, and to carry out electrolysis reaction in a high-nickel anode electrolysis container to produce phosphorus pentafluoride. The preparation method can produce high-purity phosphorus pentafluoride in one step, and the impurities are few when used for synthesizing lithium hexafluorophosphate, and no additional hydrogen chloride gas is produced, the post-processing cost is lower, and the production process is safer and more efficient. In addition, the electrolysis reaction condition is mild, the by-product waste is less, the environmental pollution is small, and the phosphorus pentafluoride gas with a purity greater than 99.99% can be obtained.

This invention relates to the field of etching technology, and in particular to an etching solution and etching method. The etching solution of this invention comprises, by mass percentage: 5wt%–18wt% nitric acid, 2wt%–6wt% glacial acetic acid, 2wt%–5wt% white phosphorus, and 2wt%–8wt% iron oxide. The etching solution of this invention exhibits excellent etching ability and stability, improves the etching morphology, and reduces etching film thickness deviation. Using the etching solution of this invention to etch steel plates to obtain pad printing steel plates improves the flatness, smoothness, brightness, and gloss of the surface of the concave-plate printing images, ensures the matching degree of film thickness for large and small images, thereby increasing the service life of the pad printing and saving pad printing costs.