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744 results about "Alkali hydroxide" patented technology

The alkali hydroxides are a class of chemical compounds which are composed of an alkali metal cation and the hydroxide anion (OH⁻). The alkali hydroxides are...

Method for preparing hydroxylapatite/polylactic acid composite biological coating on surface of magnesium alloy

The invention belongs to the field of a biomaterial, in particular to a preparation method for hydroxyapatite/polylactic acid composite biological coat on magnesium alloy surface, and solves the problem that an electrolytic deposition hydroxyapatite (HA) coat is not quite compact through sealing treatment of polylactic acid, so that the composite coat can improve corrosion resistance of magnesiumalloy in human body fluid remarkably, and biological degradability of the composite coat is used for adjusting service cycle of the magnesium alloy in vivo. The preparation method is as follows: the magnesium alloy is subjected to electrolytic deposition in water solution consisting of calcium salt, dihydrogen phosphate or hydrogen phosphate or other additives, so as to obtain a mixture coat of several calcium phosphates; the mixture coat is treated by alkali metal hydroxide solution and then transformed into an even HA coat; the HA coat is soaked in polylactic acid solution and subjected to the sealing treatment; and finally the HA coat is dried to obtain the hydroxyapatite/polylactic acid composite coat. The preparation method which combines biological activity of the HA and biological degradability of the polylactic acid organically is used for corrosion protection of the magnesium alloy in biotic environment.
Owner:INST OF METAL RESEARCH - CHINESE ACAD OF SCI

Ternary material coated with metal oxide on surface and used for lithium ion battery, and preparation method of ternary material

The invention discloses a ternary cathode material coated with metal oxide on the surface and used for a lithium ion battery, and a preparation method for the ternary cathode material. The preparation method comprises the following steps: step 1, adding soluble metal salt to a dispersant solution to enable the salt to be sufficiently dispersed evenly; step 2, adding a cathode material in a solution obtained in the step 1 for stirring for 1-5 h; step 3, adding an aqueous solution of an alkali metal hydroxide to a solution obtained in the step 2, adjusting the pH value of the solution to be 7-12, and carrying out filtering and drying to obtain a cathode material coated with metal oxide on the surface; step 4, performing heat treatment on the cathode material coated with metal oxide on the surface at the temperature of 400-700 DEG C to obtain the ternary cathode material coated with metal oxide on the surface. According to the preparation method for the ternary cathode material coated with metal oxide on the surface and used for the lithium ion battery, the method is simple, polyacrylamide is introduced as a dispersing agent and a flocculating agent, so that uniform coating of the ternary cathode material is realized, industrial production is facilitated, and the performance of the modified ternary cathode material is greatly improved.
Owner:SHANGHAI INST OF SPACE POWER SOURCES
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