51results about How to "Structure control" patented technology

The invention provides a preparation method of alkali-proof vulcanized fluororubber. The preparation method includes steps of (1), adding water, emulsifiers and pH (potential of hydrogen) modifiers in a reactor; (2), adding polymerized monomers; (3), starting a stirring device, increasing temperature to be 70-120 DEG C, and adding initiators and chain transfer agents so as to start polymerization reaction; (4), adding residual polymerized monomers in batches, and stopping reaction after all the polymerized monomers are added so as to obtain polymerized emulsion; (5), coagulating, washing and drying the polymerized emulsion to obtain fluororubber; and (6), vulcanizing the fluororubber obtained in the step (5) so as to obtain the vulcanized fluororubber. The preparation method is simple in operation and requires mild reaction conditions. The structure of the fluororubber is controlled effectively by means of regulating structures of the monomers, changing reaction temperatures and the like, so that peroxide, namely the alkali-proof vulcanized fluororubber, is prepared. The prepared vulcanized fluororubber with high Mooney viscosity also has good curability and good oil resistance and can be applied to various industrial fields.

The invention discloses a tegafur / layered double hydroxide (TF / LDHs) nanohybrid-magnetic matrix compound and a preparation method thereof. The preparation method utilizes LDHs as carriers to prepare the TF / LDHs nanohybrid-magnetic matrix compound. The TF / LDHs nanohybrid-magnetic matrix compound is used for targeted delivery and controlled release of tegafur, improves drug effects and reduces drug toxic and side effects. By a coprecipitation method, Fe3O4 or MgFe2O4 as a magnetic matrix is synthesized into the TF / LDHs nanohybrid-magnetic matrix compound which is a nano-complex composed of the magnetic matrix and TF intercalated LDHs coated on the magnetic matrix and is recorded as magnetic matrix @ (TF / LDHs). The TF / LDHs nanohybrid-magnetic matrix compound has strong magnetism and has good TF slow release effects. The preparation method has simple processes and allows mild reaction conditions. Through adjustment of magnetic matrix @ (TF / LDHs) nano-compound synthesis conditions and change of a drug concentration, a synthesis temperature, magnetic matrix content and applied magnetic field intensity, the structure, the composition and a release rate of the magnetic matrix @ (TF / LDHs) can be controlled.

The invention relates to a hydrotalcite doxifluridine sustained release agent and a preparation method thereof, which belong to the technical field of hydrotalcite materials. The formula of the hydrotalcite doxifluridine sustained release agent is (M<2+>)1-x(N<3+>)x(OH) 2(5dFUR<->)a(B)bN(OH)3.mH2O. The hydrotalcite doxifluridine sustained release agent is a medicine-hydrotalcite composite material; the mass percent of doxifluridine in the sustained release agent is between 29.72 and 38.85 percent and the mass percent of water in the sustained release agent is between 4 and 11 percent; and the lasting period of sustained release is between 0.1 and 15 hours. The preparation method comprises the following steps: carbonate hydrotalcite is prepared by the coprecipitation method at first and then is sintered into composite oxide LDO; and the composite oxide LDO is mixed with a doxifluridine solution and doxifluridine intercalative hydrotalcite with the sustained release performance is obtained by the restoring method to assemble the doxifluridine between hydrotalcite layers. The hydrotalcite doxifluridine sustained release agent and the preparation method have the advantages of reinforcing the stability, improving the bioavailability, avoiding direct contact of the doxifluridine and a gastrointestinal tract and reducing the stimulary function of the doxifluridine on the gastrointestinal tract.

The invention discloses a structure design of a weakening light module used in the flat display device. The design effectively adjusts the array of luminescence parts which belongs to well-known technology and the array control electric circuit unit. In the meanwhile, when the array mentioned above is linked with its control electric circuit, the increased quantity of luminescence parts in series is independent of the quantity of feet used for connecting interface units.

The invention discloses a novel combined crankshaft mechanism of a small aviation piston engine. The novel combined crankshaft mechanism comprises a front-section crank throw unit, a rear-section crank throw unit, a butt joint cover and a bearing component, wherein the two crank throw units have a similar structure and are mutually subjected to butt joint; the two crank throw units are subjected to butt joint fixing through an inner ring of the butt joint cover; the bearing component arranged on an outer ring of the butt joint cover is taken as a middle main shaft support; each crank throw unit comprises three cranks and two connecting rod shaft paths, wherein each crank is rectangular, two ends of each crank are of a circular arc shape, the cranks are arranged in parallel, and are fixedly connected through the connecting rod shaft paths which are mutually in parallel, and the axis of each connecting rod shaft paths and the corresponding crank are mutually vertical; the two crank throw units are far away from the outer side wall of the crank on the outermost side on a butt joint position; a front and rear end main shaft diameter and a front and rear end cone shaft diameter are respectively outwards arranged along the axis of the main shaft in sequence; the end surface of the cone shaft diameter is respectively provided with an inner threaded hole for fastening an outer connecting piece. The novel combined crankshaft mechanism of the small aviation piston engine has the advantages of simple and compact structure and reasonability in arrangement, the integral rigidity and strength of the crank is improved, and product reliability is effectively improved.

An intercalated material for the slow-releasing antiseptic of food is prepared from the laminar anionic LDHs and FP through depositing to intercalate the FP between the layers of LDHs. Its advantages are long release time (1-60 days), and easy control of material properties.