36results about How to "Does not contain easily decomposable ingredients" patented technology

The invention discloses a process for preparing compact magnesium oxide/hydroxyapatite nano fiber double-layer coating on the surface of a magnesium base. The process includes firstly preparing porous magnesium oxide coating containing phosphorus and calcium on the surface of magnesium or magnesium alloy by the microarc oxidation technique, namely utilizing phosphorus and calcium containing water solution as electrolyte, subjecting the magnesium or magnesium alloy to microarc oxidation treatment under high voltage by means of a direct-current pulse power source, and then subjecting the porous magnesium oxide coating containing phosphorus and calcium to hydro-thermal treatment in the specific hydro-thermal environment to obtain the magnesium oxide/hydroxyapatite nano fiber double-layer coating. The magnesium oxide/hydroxyapatite nano fiber double-layer coating obtained has the structure of an inner layer (adjacent to a basal body) composed of magnesium oxide and a small amount of magnesium hydrate and being compact and a surface layer formed by nano fiber hydroxyapatite layer, and has the advantages of high bonding strength, fine biological activity and capability of improving corrosion resistance of the magnesium and magnesium alloy in body fluid evidently. Besides, no discontinuous surfaces exist between the double-layer coating and the basal body.

The present invention relates to magnesium alloy surface treating technology, and is especially chemical nickel plating process for magnesium alloy. The operation process includes the following steps: activating or finishing magnesium alloy through polishing or grinding, degreasing and acid pickling with acid fluoride bearing solution at 20-60 deg.c for 0.5-5 min; pre-treating with water solution containing fluoride bearing compound, iron bearing compound and complex at 15-45 deg.c for 5-30 min; and chemically nickel plating. The said process can make chemical nickel coating with homogeneous thickness, firm combination with substrate, high corrosion resistance and metal appearance. The process of the present invention has low cost and less environmental pollution and is suitable for industrial production.

An aluminum alloy surface chemical method belongs to the fine chemical field. The treatment method is to put the aluminum alloy into the bath liquid containing potassium permanganate 0.01 to 10g/L, titanous sulfate 0.01 to 5g/L, wetter sodium dodecylbenzene sulfonate 0.1 to 10g/L, with the pH value being 1 to 4, and the temperature of 40 to 90DEG C to treat for 1 to 8 minutes, and then seal with boiled water for 20 to 30 minutes, and finally an even, fine golden conversion film with certain thickness is obtained on the surface of the aluminum alloy. The conversion film has excellent corrosion resistance performance. The invention can well solve the problems that products or emission during or after treatment of the current chromate solution to the aluminum alloy surface contain sexivalent chromium, which severely pollute the environment and harm the health of human body, etc; and the corrosion resistance of the invention is equal to that after treatment by the chromate solution.

The invention discloses a fire resistant material and a preparation method thereof, in particular to a silicon dioxide-containing fire resistant material and a preparation method thereof. The fire resistant material is prepared by adopting an organosilicon polymer as a base body and an inorganic additive as an additive under a condition of slowly warning up. The fire resistant material and the preparation method thereof can be used for preparing a series of high temperature resisting material articles such as high-temperature service liners, high temperature vessels and refractory bricks, and solve a series of problems of existing refractory material products that preparation technology energy consumption is great, components are complex, components which are unstable or are easily volatilized and decomposed under high temperature action are contained, and the like.

The invention discloses a preparation technology of porous calcium gluconate tantalite/nono-funicular hydroxylapatite bioactive coating. The preparation technology comprises the following step of firstly preparing calcium and phosphorus-containing gluconate tantalite-based complex phase layer on the surface of tantalite by a micro arc oxidation technology, i.e. taking calcium and phosphorus-containing water solution as electrolyte, carrying out the micro arc oxidation treatment on the tantalum under high voltage by using a pulse power source, and carrying out the hydro-thermal treatment on the calcium and phosphorus-containing gluconate tantalite-based complex phase layer under a special hydro-thermal environment condition. The obtained coating with a double-layer structure has the following structure and performance characteristics: an inner layer (which is adjacent to a base body) is a gluconate tantalite-based complex phase layer which consists of gluconate tantalite, and a trace amount of antalum pentoxide and tantalum monoxide and is of a microporous structure in shape; and a surface layer is nono-funicular hydroxylapatite, which is inclined to or in parallel with the gluconate tantalite-based complex phase layer. No incontinuous interface exists between the coating with the double-layer structure and the base body, so that the coating is high in combining strength, and the osteolith can be quickly formed in the pseudo body fluid environment in an inducing way, so that the coating is good in biological activity.

The invention discloses a nanorod array coating with thermal control immune and antioxidant functions as well as a preparation method and application of the nanorod array coating, and belongs to the technical field of biomedical materials. The preparation method comprises the following steps of firstly, preparing a porous titanium dioxide coating containing phosphorus and calcium on the surface layer of titanium or an alloy thereof by adopting a micro-arc oxidation process, and then growing a hydroxyapatite nanorod configuration coating in situ on the porous titanium dioxide coating containingphosphorus and calcium by adopting a hydrothermal treatment method; and finally, preparing a polydopamine-coated hydroxyapatite nanorod array by using an oxidation auto-polymerization method to finally obtain the nanorod array coating with both thermal control immunity and antioxidant functions. The process is stable, and the controllability is high. The surface layer of the prepared biomedical material has dual effects of oxidation resistance and photo-thermal property at the same time. As an implant, the implant can heal and regenerate bone tissue, and avoids coating peeling induced by poormembrane/base binding force and side reactions such as osteolysis or excessive inflammation induced by the coating peeling and the like.