47results about How to "Uniform hole formation" patented technology

The invention discloses a degradable regenerative medical material for promoting tissue in-situ regeneration and a preparation method of the medical material. The degradable regenerative medical material is formed by Si, P, O, and metallic elements containing calcium through chemical bonding, and is of a regular three-dimensional net structure formed by taking a material with a nano-scale mesoporous structure as a framework, and pores and micron-scale macropores communicated with the pores are uniformly formed in the regular three-dimensional net structure. The preparation method of the degradable regenerative medical material comprises the steps of preparation of mixed gel, foaming and curing and calcination. The regenerative medical material has a huge specific surface area, powerful biological activity, high biological safety, has an effect of promoting cell proliferation, can induce rapid regeneration of own cells of injury tissue, and achieve an in-situ tissue repair function.

The melt spinning process of producing hollow fiber membrane includes the first mixing glass fiber with inorganic particle, polymer pore creating agent, surfactant and non-solvent to constitute spinning composition, heating the composition to temperature higher than the smelting point of the polymer, the subsequent extruding the melt through spinning head and cooling to form hollow fiber, and final eliminating the inorganic particle, polymer pore creating agent, surfactant and non-solvent to produce the high strength hollow fiber membrane. The spinning composition consists of polymer 20-90 wt%, glass fiber 0.5-20 wt%, inorganic pore creating agent 5-50 wt%, polymer pore creating agent 2-30 wt%, surfactant 2-60 wt%, and organic non-solvent 10-60 wt%.

The invention discloses an aramid fiber slurry, a preparation method thereof, and a diaphragm based on the aramid fiber slurry. The preparation method of the aramid fiber slurry includes the following steps: preparing a first solution and a second solution, and dissolving the first solution Mix with dimethylacetamide, stir until uniform, add water, stir until uniform, add isopropanol, stir until uniform, then add dimethyl carbonate, stir until uniform, add the second solution, stir until uniform, Obtain the aramid fiber slurry, the aramid fiber slurry of the present invention contains alcohol, water and ester, adjust the ratio of three kinds of non-solvents (alcohol, water and ester) creatively, let alcohol, water and ester three kinds of non-solvents jointly Under the action, it occupies the position of the aramid fiber slurry, and after the aramid fiber is solidified with pure water, the non-solvent is evenly dissolved into the water, which has an extraction effect and makes the aramid fiber evenly form pores.

The invention relates to novel bone cement and a preparation method thereof. The novel bone cement consists of the following components in percentage by weight: 47-78wt% of magnesium oxide, 20-50wt% of ammonium phosphate, 0.5-10wt% of retarder, 0.01-10wt% of magnesium powder and a solidifying liquid, wherein the liquid-solid ratio of the solidifying liquid to the mixture of the materials is 0.06-1.0ml / g. According to the novel bone cement and the preparation method thereof disclosed by the invention, the system is accelerated to generate ammonia gas to form pores by adding the magnesium powder into the system of ammonium phosphate and magnesium oxide. The preparation process provided by the invention is simple and convenient. According to the porous structure obtained by the method, the pore size is uniform and the porosity is great, so that cell adsorption and climbing are facilitated, thereby promoting the growth of bone cells. The novel bone cement provided by the invention has good mechanical properties, biocompatibility and biocompatibility and can be widely applied to the field of medical materials.

The invention discloses a synthetic method of nanometer magnesium fluoride with a high specific surface area. The method comprises the steps as follows: 1), magnesium salt is fully dissolved in deionized water, so that a reaction liquid A is obtained, wherein the magnesium salt adopts one or a combination of any of magnesium acetate, magnesium chloride and magnesium nitrate; and ammonium salt is dissolved in deionized water, so that a reaction liquid B is obtained, wherein the ammonium salt adopts ammonium fluoride or a combination of the ammonium fluoride and ammonium acetate; 2), the reaction liquid A and the reaction liquid B are mixed under stirring, and reaction is performed; 3), after reaction, stirring is stopped, and the mixture is stood for aging; 4), after aging, filtration or centrifugal separation is performed, and the mixture is dried; and 5), a dried sample is roasted, so that the nanometer magnesium fluoride is obtained. The nanometer magnesium fluoride prepared with the method has the high specific surface area, the synthetic method is simple, the production cost is low, the preparation period is short, operation and control are easy, and small corrosiveness is caused to a device.

The invention discloses a hollow fiber membrane stretching device which comprises a tension roller group, a setting component, a yarn unreeling roller, a rolling roller and a pressing roller, wherein the tension roller group comprises an upper roller and a lower roller; a hollow fiber membrane is wound between the upper roller and the lower roller in an S shape; the setting component comprises a setting device used for heating the hollow fiber membrane; at least two tension roller groups are arranged on the setting component; the upper roller and the lower roller are arranged on two sides of the setting component opposite to each other and are vertically arranged; the wire uncoiling roller is arranged at the front end of the tension roller group; the rolling roller is arranged at the rear end of the tension roller group; the rolling speed is consistent with that of the tension roller in a setting area; a gap used for allowing the hollow fiber membrane to pass is formed between the pressing roller and the upper roller; multiple tension groups are arranged, a speed ratio is formed, and the aim of stretching the fiber membrane to form a hole is fulfilled; and the passing speed of the fiber membrane is consistent with that of the last stretched roller in the setting area, and the stressed tension is kept consistent during passing. Therefore, the efficiency and the product quality are improved.