3results about How to "Easy shape control" patented technology

The invention provides composite silver soldering paste and a preparation method and application thereof.The preparation method comprises the following steps that silver nitrate and PVP are dissolved in an ethylene glycol solution, and stirring is conducted for 20-45 min through a constant-temperature magnetic stirrer at the temperature of 45-75 DEG C; adding a certain amount of HCl into the mixed solution, magnetically stirring for 15-30 minutes, and cooling to room temperature; putting the mixture into a reaction kettle, and performing vacuum constant-temperature heating for 150-200min at 100-190 DEG C; and after washing with deionized water and absolute ethyl alcohol, carrying out ultrasonic treatment to obtain the composite silver soldering paste. According to the multi-scale composite silver soldering paste, an ethylene glycol reduction method is adopted, silver ions in a solution are reduced into silver atoms, submicron or micron particles are secondarily grown on the basis of nano-silver particles, and the multi-scale composite silver soldering paste is prepared and has better electrical and mechanical properties; the multi-scale silver particles are easy to generate, the reaction conditions are easy to control, the preparation method is simple, safe and environmentally friendly, the needed raw material types are few, the number of devices is small, few organic matter is added, and the nano-silver particles controllable in morphology and size are easy to obtain.

This invention relates to a large-weight, wide-width high-temperature alloy coil and its manufacturing method, belonging to the field of high-temperature alloy materials. It solves at least one of the following problems existing in the production of wide-width high-temperature alloy sheets: difficulty in controlling dimensional accuracy, poor surface quality, large quality fluctuations, high production difficulty, and high cost. A method for preparing a large-weight, wide-width high-temperature alloy coil includes: slab pretreatment; hot rolling of the coil; solution treatment and surface treatment of the coil; cold rolling and intermediate annealing of the semi-finished coil; and cold rolling and processing of the finished coil. This invention achieves the production of high-quality, high-performance, and high-dimensional-accuracy high-temperature alloy sheets with wider widths and thinner thicknesses.

The invention relates to an exosome separation and extraction method, in particular to a human peripheral blood macrophage exosome separation and extraction method. The invention discloses a method for separating and extracting human peripheral blood macrophage exosomes, which has the characteristics of convenience in collection, safety and reliability compared with a common separation and extraction method, avoids the problems of ethical heredity and rejection anaphylaxis of exosomes of heterologous tissue cells or exosomes of allogeneic tissue cells such as umbilical cord, abdominal cavity and the like, and has the advantages of simple operation and high efficiency. The exosome is easy to apply clinically and is an ideal source exosome.