39results about How to "Smooth fiber surface" patented technology

The invention relates to a preparation method of a continuous fiber of a yttrium aluminum garnet. The method comprises the steps of preparing a spinnable precursor sol from aluminum oxide sol containing Al13 colloidal particles, a gamma-AlOOH nano dispersion liquid, yttrium oxide sol, glacial acetic acid and polyvinylpyrrolidone (PVP), preparing a gel continuous fiber by adopting a dry spinning technology and carrying out thermal treatment to obtain the continuous fiber of yttrium aluminum garnet, which is 6-12 microns in diameter. The precursor sol prepared by adopting a sol-gel method is uniform and stable, and can be stored for a long period of time. The length of the gel continuous fiber prepared with dry spinning can reach 3,000m, the fiber subjected to thermal treatment is smooth in surface, the internal structure is compact, the strength is high, and the fiber has very good flexibility, is small in high-temperature creep in a high-temperature using process, and can be widely applied to a composite material and a thermal protection material in the industries such as aerospace. The method is simple in process and short in production period, and industrialization is easy to implement.

The invention relates to a modification method for a leukocyte filtering membrane. The modification method includes the following steps that S1, a hydrophobic resin filtering membrane is put in first modification mixed liquid for first-time impregnation for 0.5-2 h at the temperature of 20-40 DEG C and the pressure of 1-10 MPa, the hydrophobic resin filtering membrane is taken out, washed and then dried for 6-10 h at the temperature of 50-60 DEG C, and a first modified filtering membrane is obtained; S2, the first modified filtering membrane is put in second modification mixed liquid for second-time impregnation for 0.5-2 h at the temperature of 20-40 DEG C, the first modified filtering membrane is taken out, washed and then dried for 6-10 h at the temperature of 50-60 DEG C, and the modified filtering membrane is obtained. The modified filtering membrane obtained through the method has good wettability, stability and compatibility, blood platelets in fresh blood and blood preserved at normal temperature are activated to capture leukocyte, it is achieved that the leukocyte and the blood platelets are filtered out at the same time, and the filtering effect is good.

The invention discloses a high-strength high-elasticity intravascular stent and a preparation method thereof and belongs to the field of chemical and ecological engineering. The high-strength high-elasticity intravascular stent has the advantages that a biocompatible polymer material is taken as a precursor; firstly, an electrostatic spinning method is adopted for preparing fibrous membranes with different mechanical properties; and on this basis, an electrospinning technology and a solution soaking and removing method are combined for preparing a high-strength, high-elasticity and high-porosity artificial intravascular stent, fibers used for forming the artificial intravascular stent are smooth in surface, uniform in morphology, narrow in fiber diameter distribution range, and excellent in vascular performance. The obtained artificial intravascular stent with high cell compatibility, strength, elasticity and porosity can be produced in a large scale and is expected to be applied to the actual clinical diagnosis.

The invention discloses a method for preparing polyacrylonitrile nano-fibers by circulation and coaxial electrospinning of a surface active agent solution. Self-assembly coaxial spinning heads are adopted for electrospinning. The method is characterized in that outer sheath fluid for coaxial electrospinning is the surface active agent solution. A surface active agent comprises cationic, anionic and nonionic surface active agents dissolved in N,N-dimethylformamide, N,N-dimethylacetylamide or dimethylsulfoxide. The concentration of the surface active agent is 1%-6% (w / v). According to the method, the preparation process is simple, the prepared polyacrylonitrile nano-fibers are not only small in diameter and uniform in distribution, but also low in diameter dispersion factor and smooth in surface, and the defects that the spinning process is interrupted due to the easy blockage of the spinning head, the produced polymer nano-fibers are poor in quality, and the like in the prior art can be overcome.

The invention provides a method for preparing graphene fibers, which comprises the following steps: in a vacuum environment and / or an inert gas environment, the SiC fiber is subjected to a temperature-raising step, and the temperature is raised to the decomposition and escape temperature of silicon element, and then kept warm to obtain the graphene fiber. The method uses SiC fibers as raw materials, and adopts a simple process to realize the continuous industrial preparation of graphene fibers.

The invention discloses a method for preparing a magnesium oxide composite fiber. The method is implemented by using a characteristic that a high-molecular polymer is easily formed into filaments and comprises the following steps: loading magnesium chloride on the high-molecular polymer so as to form a gel, and carrying out filament picking and calcining on the gel so as to obtain the magnesium oxide composite fiber. The obtained fiber is smooth in surface, has no significant defect, and has a relatively long length diameter, so that the fiber has good application prospect and good commercial value in the aspect of refractory and insulating materials.

The invention provides a drug-loaded nanofiber with a radial discontinuous drug distribution characteristic. The drug-loaded nanofiber comprises an inner core layer, wherein a middle layer is arranged at the periphery of the inner core layer; an outer surface layer is arranged at the periphery of the middle layer; the inner core layer, the middle layer and the outer surface layer coaxially stretch; drugs in the fiber are radially distributed discontinuously; and the inner core layer and the outer surface layer contain the drugs. The invention further provides a preparation method of the drug-loaded nanofiber. The preparation method comprises the steps that a spinnable polymer solution is prepared into a mother solution; the drugs are added to the mother solution to form an inner core layer working fluid and an outer surface layer working fluid; the inner core layer working fluid and the outer surface layer working fluid are respectively packed into an inner core layer fluid injector and an outer surface layer fluid injector; a middle layer fluid injector is filled with the mother solution; the inner core layer fluid injector, the middle layer fluid injector and the outer surface layer fluid injector are respectively connected with three injection pumps; injection rates of the three fluid layers in a three-stage coaxial spinning head are respectively controlled by the three injection pumps; and the nanofiber with the radial discontinuous drug distribution characteristic is prepared by the action of high-voltage static. The nanofiber prepared by the method is clear in structure, small in nano diameter and good in linearity.

The invention provides an electro-spinning nano fiber with discrete uneven distribution characteristics of drugs. The fiber comprises a core part. A sheath part is arranged at the outer circle of the core part. The core part and the sheath part extend coaxially. The inside of the core part is loaded with drugs. One side of the sheath part is provided with a parallel outer surface layer. The parallel outer surface layer extends in the length direction, and covers 40-60% of the outer circle of the sheath part. The inside of the parallel outer surface layer is loaded with drugs. The invention further provides a preparation method of the nano fiber, and a device for achieving the preparation method. The electro-spinning nano fiber with discrete uneven distribution characteristics of drugs has the advantages of being simple in preparation process, effective in a single step, clear in the structure of the prepared nano fiber, small in nano-particle diameter, good in linearity, uniform in diameter distribution and smooth in fiber surface. The uneven distribution characteristics of drugs provides an effective implementation method for the design of a plurality of new drug slow release materials.

The invention provides a drug-loaded nanofiber with drug gradient distribution characteristics. The nanofiber comprises an inner core layer, the periphery of the inner core layer is provided with an interlayer, the periphery of the interlayer is provided with an outer surface layer, the inner score layer, the interlayer and the outer surface layer extend coaxially, the inner core layer, the interlayer and the outer surface layer all contain drugs, and drug concentration increases in sequence from outside to inside in gradient distribution. The invention further provides a preparation method of the nanofiber with the drug gradient distribution characteristics and provides a device for achieving the method. According to the preparation method of the nanofiber with the drug gradient distribution characteristics, the preparation process is simple, and effective with single step, the prepared nanofiber inner core layer, interlayer and outer layer are clear in structure, and the nano is small in diameter, good in linearity, even in diameter distribution and smooth in fiber surface. The drug gradient distribution method is capable of providing an effective implementation method for the design and preparation of a great number of drug slow and controlled materials.

The invention relates to an electric spinning preparation method of nanometer fiber with material gradient distribution features. A spinning polymer solution is used as mother liquid; the mother liquid is uniformly divided into three parts; additives are sequentially added into the three parts of mother liquid in a way that the content is gradually increased or gradually decreased; the materials are uniformly stirred; inner layer work fluid, middle layer work fluid and outer layer work fluid are formed, and are correspondingly charged into inner, middle and outer fluid injectors; the three fluid injectors are connected with one three-stage coaxial spinning head; the three kinds of work fluid respectively flows into coaxial capillaries of the three-stage coaxial spinning heads; the three-stage coaxial spinning heads generates the nanometer fiber with the material gradient distribution features under the effect of high-voltage static electricity; the nanometer fiber is collected by an aluminum foil covering paper board. The electric spinning preparation method provided by the invention has the advantages that the preparation process is simple; the single step is effective; the prepared inner / middle / outer three-layer structure of the prepared nanometer fiber is clear; in addition, the nanometer diameter is small; the linearity is good; the diameter distribution is uniform; the fiber surface is smooth. Through the material gradient distribution features, the effective implementation method can be provided for the design and the preparation of various novel nanometer materials.