51results about How to "The preparation method has few steps" patented technology

The invention discloses a polyglycolic acid-polycaprolactone film, which consists of 5-15 parts of polyglycolic acid and 85-95 parts of polycaprolactone in parts by weight; 10 to 200 μm particles, the molecular weight of the polyglycolic acid is 9 to 110,000, the molecular weight of the polycaprolactone is 100,000 to 200,000, and the thickness of the polyglycolic acid-polycaprolactone film is 10 ~ 200 μm; the polyglycolic acid-polycaprolactone film of the present invention is a non-porous dense film in the early stage of implantation, which can isolate the postoperative tissue. Because polyglycolic acid has a faster degradation rate than polycaprolactone, it Micropores can be obtained with the degradation of polyglycolic acid after being implanted into the human body. On the one hand, the appearance of micropores accelerates the breaking and degradation of the material. On the other hand, the film after the appearance of micropores can still maintain the original shape, ensuring The effective isolation function of the film shortens the retention time of the film in the human body and reduces the risk of complications; the preparation method of the polyglycolic acid-polycaprolactone film of the present invention has fewer steps and fewer processes, and is easy to realize industrial production.

The invention relates to dendritic polymer-modified magnetic microspheres with uniform particle sizes and a preparation method and application thereof. Through use of a dendritic polymer on the surface of a magnetic carrier, the magnetic microsphere is obtained. The magnetic carrier is a magnetic nanoparticle or a magnetic microparticle. The preparation method comprises directly dispersing the dendritic polymers in a solution for synthesis magnetic microspheres and directly synthesizing the dendritic polymer-modified magnetic microspheres through a hydrothermal synthesis one-pot method. The magnetic microspheres have the better capability of enrichment, have uniform magnetic particle sizes, are prepared through simple processes and are free of post-modification.

The invention belongs to the technical field of energetic materials and relates to a metal salt complex of p-nitrocalixarene and a preparation method thereof. The general formula of the metal salt complex of the p-nitrocalixarene is MnC7aHm plus 2jNaO3a plus j. The metal salt complex of p-nitrocalixarene and the preparation method thereof have the beneficial effects that an energetic compound of an energetic group, i.e. the p-nitrocellulose [4, 6, 8] energetic metal salt complex is obtained through reacting the p-nitrocalixarene and soluble transition metal salt; the characteristics of easiness in synthesis, high melting point, good heat stability and good chemical stability of calixarene are fully utilized; as the metal salt complex is taken as a combustion catalyst of a energetic material under a high-energy high pressure, the sensitivity value of the energetic material is reduced to a certain degree; and moreover, the metal salt complex has the synergetic effect, so that the energy content of the energetic material is increased. The preparation method has the advantages of fewer steps, simplicity and fewer byproducts and is suitable for industrialized production.

The invention discloses a splitting core column for synthesizing diamond and a preparation method thereof. The splitting core column for synthesizing the diamond comprises a core column tube, wherein a core column is arranged in the core column tube, a first core column piece is arranged on the upper end of the core column tube, and a second core column piece is arranged on the lower end of the core column tube. According to the splitting core column for synthesizing the diamond, different mixing ratios of peripheral materials to internal materials are adopted, and the weight ratio of catalysts of the peripheral materials is controlled to be higher than that of the core column by 4% to 8%, so as to effectively control the granularity of the peripheral materials, thereby reducing the growth rate of the peripheral materials, so that the whole core column for synthesis grows at uniform speed in the process that graphite is converted into the diamond, and the granularity of the synthesized diamond is uniform; the isostatic pressing granulation granularity range of the core column pieces and the core column tube and the isostatic pressing granulation granularity range of the core column are controlled, so that materials are uniformly fed into a die cavity during pressing, and the density of pressed products of the core column pieces, the core column tube and the core column is uniform, thereby guaranteeing the quality and the yield of the synthesized diamond.

The invention discloses a polylactic acid-trimethylene carbonate film doped with polyglycolic acid particles. In parts by weight, it consists of 1-3 parts of polyglycolic acid particles and 5-5 parts of polylactic acid-trimethylene carbonate copolymer. 15 parts form a film with a thickness of 20-200 μm; the average particle diameter of the polyglycolic acid particles is 10-200 μm, and the molecular weight is 9-110,000; the molecular weight of the polylactic acid-trimethylene carbonate copolymer is 10-200 μm. 200,000; the polylactic acid-trimethylene carbonate film doped with polyglycolic acid particles of the present invention is a non-porous dense film in the early stage of implantation, which can isolate postoperative tissues and has good biocompatibility. Polyglycolic acid degrades faster than polylactic acid-trimethylene carbonate, so micropores can be obtained with the degradation of polyglycolic acid after implantation in the human body. On the one hand, the appearance of micropores accelerates the fragmentation and degradation of materials. On the one hand, the film after micropores can still maintain the original shape, which ensures the effective isolation of the film, shortens the retention time of the film in the human body, and reduces the risk of complications.