47results about How to "Control mechanical strength" patented technology

The invention discloses a micro-capsule essence with two-layer capsule walls and a preparation method and an application thereof. The essence comprises inner oil essence, a first micro-capsule wall inthe middle and an outer capsule wall located on outermost layer. The micro-capsule essence with two-layer capsule wall of the invention has two-layer capsule wall structure , good mechanical strengthand flexibitity; in addition, when used in cloth the micro-capsule essence has the advantage of strong washing resistance, long fragrance holding time and easy storage. The preparation method of themicro-capsule essence with two-layer capsule walls adopts complex coacervation phase separation method to prepare the essence, the technological design is seasonable, the maneuverability is strong, micro-capsule essence with different fragrances can be designed according to different demands; in the preparation process, the mechanical strength of the micro-capsule essence can be effectively controlled so as to control the duration time and degree of the frangrance of the micro-capsule essence; in addition, the finished product of the micro-capsule essence with two-layer capsule walls preparedin the invention has high qualification rate and the micro-capsule essence with two-layer capsule can realize industrialized production.

A method for preparing a soft magnetic composite material through hot pressing includes the following steps: dispersing particle soft magnetic powder into a dispersing medium, adding a coupling agent to conduct surface processing, conducting separation to obtain magnetic powder wrapping the coupling agent, conducting washing and drying through absolute ethyl alcohol to obtain the coupling agent modified magnetic powder, mixing the epoxy resin and an epoxy hardener to obtain an epoxy resin system mixture, mixing the coupling agent modified magnetic powder and the epoxy resin system mixture according to the proportion to obtain mixed slurry containing the magnetic powder and the epoxy resin system mixture, pouring the mixed slurry into a container, conducting vacuumizing, arranging the container into a constant temperature oven to conduct procuring to obtain composite slurry obtained through procuring, transferring the procured composite slurry into a mould, and conducting solidification and die pressing through a hog pressing machine to obtain the soft magnetic composite material. The method is simple in process, low in cost, favorable for operation and capable of achieving good magnetic performance and dynamic strength of the composite material by adjusting the content of the magnetic powder. The shape is controllable, and the mechanical performance is good.

The invention discloses sodium alginate-chitosan poly-ion composite hydrogel and a preparation method thereof. By means of the preparation method, the concentration of a sodium alginate-chitosan poly-ion composite solution is greatly increased, the number of ion pairs capable of reacting is increased, accordingly, the mechanical strength of the hydrogel is improved, it is achieved that the preparation process of the hydrogel is controllable, and the hydrogel in different shapes can be prepared by designing the shapes of molds according to the actual needs. The preparation method is mild in condition, chemical substances, such as a cross-linking agent and a photoinitiator are not needed, the mechanical strength of the sodium alginate-chitosan poly-ion composite hydrogel prepared by using the method can reach 1.8 MPa, and the sodium alginate-chitosan poly-ion composite hydrogel has a good application prospect.

The invention provides a shape memory material on the basis of polylactic acid and a preparation method thereof. The shape memory material is characterized by consisting of the polylactic acid and hyper branched polyesteramide, wherein, the weight portion of the polylactic acid is between 80 and 98 portions and the weight portion of the hyper branched polyesteramide is between 2 and 20 portions. The shape memory material has the advantage that various performances of a product such as the mechanical intensity, the breaking elongation and the degree of crystallinity can be controlled by changing the ratio of the hyper branched polyesteramide to the polylactic acid and mixing the two. The general polylactic acid material is easy to rupture when subject to a stretching or bending stress. The polylactic acid material overcomes the shortcoming of brittleness of the pure polylactic acid and has high toughness and elongation at break. Therefore, the polylactic acid material does not break at a high draw ratio, can restore to the prior shape by being heated and has good shape memory effect.

The invention provides a controlled release coating material containing polymer micro nanoparticles. The controlled release coating material comprises the following components: ethylene-vinyl acetate copolymerization polymer and a blending polymer alloy thereof; polyvinylpyrrolidone and complex microelements and drug thereof; and polymer micro nanoparticles. The controlled release coating material containing the polymer micro nanoparticles is adjustable in chemical structure and has good film-forming property and degradability; by adding the polymer micro nanoparticles with uniform particle size, the porosity and controlled release property of coating can be regulated; besides, by loading specific active substances in a chemical bonding manner, multi-functionalization of controlled-release fertilizer is realized. The controlled release coating material containing the polymer micro nanoparticles can be taken as a coating of an agricultural controlled release fertilizer and can be also taken as a pesticide controlled release coating and coatings of other medical products.

The invention relates to a preparation method of a sustained and controlled release coated material, and particularly relates to a method for preparing a sustained and controlled release coated material from polymer micro-nano particle employing an embedding method. The method comprises the following steps: preparing the polymer micro-nano particles; dissolving environment-friendly biodegradable polymers and blending polymer alloy thereof; dissolving polyvinylpyrrolidone and microelements complexed by polyvinylpyrrolidone and drugs; mixing disperse systems obtained in the previous steps; atomizing, spraying and drying the surface of a granulated fertilizer. The method for preparing the sustained and controlled release coated material is simple and convenient in technology; the used solvent is low in toxicity and can be recycled; regulation and control of the porosity and the slow controlled release performance of a capsule are achieved by adding the polymer micro-nano particles with even grain sizes.

The invention discloses an industrial heat-resisting fireproofing instrument cable which is characterized in that a conductor is formed by a plurality of tinned copper wires in a twisting mode, a fireproofing layer wraps the conductor in a pressing mode, an insulating layer wraps the fireproofing layer in a pressing mode to form an insulating wire core, a pair twisting set is formed by two insulating wire cores, a polyester belt wraps the outer surface of the pair twisting set in a lapping mode, and a shielding layer knitted by tinned copper wires is arranged on the outer surface of the polyester belt to form a pair twisting unit. A cable core is formed by the multiple pair twisting units in a twisting mode. A polyester belt lapping wrapping layer, a longitudinal drainage wire, a tinned copper wire knitting total shielding layer, a copper foil lapping wrapping layer and an outer jacket layer formed in a pressing wrapping mode are sequentially arranged on the outer surface of the cable core from inside to outside, and the insulating layer and the outer jacket layer are made of fluororesin. The industrial heat-resisting fireproofing instrument cable has excellent fireproof performance and high-temperature-resisting performance, has excellent electrical performance and bending performance, is light and handy in cable structure, and meets the requirement for serving as an electric instrument connecting wire under the harsh high temperature environment.

The film is made of the material with the general formula of SiOxRy, whose comical bond is Si-O.Si-C.C-H; which contains Nanometer micropore. The producing process is as below. The siloxane organics is applied as template to produce the colloidal sol in the organic liquid, and paint the colloidal sol on the silicon wafer to form the film. The anneal temperature is around 200-600 deg.C and the heating up rate is about 5-20 deg.C per minute.

The invention relates to a star-shaped polyglutamic acid as well as injectable hydrogel and a preparation method thereof. According to the preparation method, firstly, polyamino beta-cyclodextrin is stereospecifically synthesized, secondly, a plurality of polymerization reaction initiation sites are introduced so as to initiate ring-opening polymerization of L-glutamate-N-carboxylic acid anhydride, and finally the L-glutamate-N-carboxylic acid anhydride subjected to ring-opening polymerization is modified to be used as a first component of hydrogel; meanwhile, modified polysaccharide polymer is used as a second component of the hydrogel, the two components are mixed according to a certain ratio, through chemical crosslinking of the Schiff base reaction, the star-polyglutamic acid hydrogel is obtained, and the gelation time is 7-300 s. The hydrogel is characterized by having an excellent apparent appearance, mechanical properties, biocompatibility and biodegradability; in addition, beta-cyclodextrin is used as a core of the star-shaped polyglutamic acid, so that additional stable crosslinking sites are provided, the improvement of the mechanical strength of the hydrogel is facilitated, and the loading and controlled release properties to hydrophobic drugs are improved. The hydrogel has a wide application prospect in the fields of drug controlled release, tissue engineering, regenerative medicine and the like.

The invention discloses a bioactive porous titanium medical implant material and a preparation method and belongs to the technical field of biomedical materials. The material comprises a base layer and a surface layer; the base layer is made of porous titanium; the surface layer includes a dense titanium oxide layer, a titanium oxide gel mediate layer and a calcium phosphate external layer. The method includes porous titanium blank preparation, blank sintering and surface chemical and electrochemical treatment. The material prepared by the method has the advantages of a three-dimensional communicated porous structure with adjustable porosity and pore size, the mechanical strength matches with the body's natural bones, the bioactivity can be improved through the bioactive layer with the three layered surface structure, the porous material with a gradient pore structure can be prepared through combination of organic foam with different pore sizes, and the material is particularly adaptive to serving as a bone defect repair or replace material of the human body load-bearing portion.

The invention discloses a preparation method of a heat-resisting seal microcapsule with sensitive pressure. The preparation method comprises the steps of: firstly, preparing a microcapsule wall material, controlling the temperature to be within 20-80 DEG C, preparing epoxy rein and a core material curing agent equivalent to 0.50-0.85 time that of the epoxy resin into a prepolymer; then dissolving a prepolymer wall material in a solvent to form a solution; controlling the temperature of the solution to be within 20-80 DEG C, dropping a core material in the solution by using a needle hole until the microcapsule wall is cured and formed; filtering, washing and drying to obtain the heat-resisting seal microcapsule with the sensitive pressure. The preparation method is simple in process and equipment; meanwhile, a water phase is not introduced and the limitation to the water solubility or oil solubility of the microcapsule core material is not caused; through controlling the proportion and a system degree of functionality between the epoxy resin and the curing agent, the mechanical strength, the sealing property and the heat resistance of the microcapsule can be effectively controlled. The microcapsule is used as a micro-container, and can be used in fields of self-repairing materials, latent adhesives or other core materials needing release control or isolation.

The invention provides a large area nitrogen-doped carbon nano-tube paper preparation method, which comprises: (1) weighing ferrocene powder, dissolving in dichlorobenzene to form a ferrocene/dichlorobenzene carbon source solution, weighing pyridine, and mixing the pyridine and the ferrocene/dichlorobenzene carbon source solution to form a ferrocene/dichlorobenzene/pyridine mixing carbon source solution; 2) coiling an iron sheet or copper sheet substrate into a cylindrical material, placing into the quartz reaction chamber of a reaction furnace, sealing the reaction chamber, introducing argon gas to completely discharge air, and heating the reaction furnace; 3) when the temperature of the reaction chamber achieves 750-900 DEG C, adjusting the argon flow rate while introducing hydrogen; 4) injecting the ferrocene/dichlorobenzene/pyridine mixing carbon source solution into the reaction chamber, and carrying out a reaction; and 5) stopping the heating of the tubular reaction furnace, closing the hydrogen, adjusting argon flow rate to make the product be cooled to a room temperature along with the furnace, and collecting the large area nitrogen-doped carbon nano-tube paper on the substrate. According to the present invention, the nitrogen-doped structure carbon nano-tube film two-dimensional structure and the simple, rapid and large-scale preparation method can be used for the fields of new energy sources, sensors, flexible electronic devices, and the like.

The invention relates to a preparation method and application of a high-strength pollution-resistant composite reverse osmosis membrane, and the method comprises the following steps: synthesizing aminated carbon nanowires, fixing the nanowires in the reverse osmosis membrane, and by utilizing the high strength of the aminated carbon nanowires and the reactivity of amino groups, forming a double cross-linked layer of m-phenylenediamine (MPD) trimesoyl chloride (TMC) and aminated carbon nanowire trimesoyl chloride (TMC), so the stability and the mechanical strength of a desalting layer are greatly improved, and meanwhile, the flux and the desalting performance of reverse osmosis are also improved due to excellent dispersing performance, rich hydrophilic amino groups and relatively large specific surface area of aminated carbon nanowires. The test result also shows that compared with the existing reverse osmosis membrane, the reverse osmosis membrane prepared by the invention has higher mechanical strength, flux and desalination performance.

The invention provides a preparation method of graphite foam. The method comprises the following steps that graphite nanosheets are used as raw materials; a small number of macromolecular bonding agents are added; through template forming, the graphite foam is formed after the drying. The preparation method provided by the invention is simple and convenient, and can be used for forming graphite foam in various shapes; in addition, the prepared graphite foam has the controllable density and uniform pores. The prepared graphite foam also has the advantages of high pressure-resistant intensity, low resistance, oil absorbability, high heat conductivity and the like, can be widely applied to the fields of heat radiators, heat conduction pads, electromagnetic shielding materials and the like, and has wide application prospects.

The invention relates to a membrane coated hydroxyapatite (HA) ceramic spinal fusion cage prepared by adding HA powder to a polyether-ether-ketone material and sintering, and the surface of the spinal fusion cage is coated by a polylactic acid (PLA) membrane, wherein the HA can adjust and control the composition and grain size of the material to achieve the best mechanical property of the material; and the PLA membrane with high surface molecular weight can further effectively overcome the brittleness of HA, and especially improves the fracture toughness, thus overcoming the brittleness of the conventional HA ceramics, and meeting the mechanical requirements on the spinal fusion cage. Simultaneously, the HA ceramic spinal fusion cage provided by the invention can keep the biological activity of the HA and achieve bony fusion with bone in vivo. The invention also comprises the membrane coating method of the membrane coated HA ceramic spinal fusion cage.

The invention relates to an apparatus and method for detecting the wear resistance of a flue gas denitration catalyst. No apparatus or method for detecting the wear resistance of the catalyst exists at present, so the mechanical strength of the catalyst is difficult to control. The apparatus comprises a test sample bin and an apparatus rack, and also comprises a quartz sand feeder, a wind blower, a wind speed measurer, a wind speed adjusting device, a contrast sample bin, a feeding homogenizer, a discharging tube, a wind tube, a differential pressure measuring device, a cloth bag deduster and an abrasive collection barrel, one end of the wind tube is connected with the wind blower, the other end of the wind tube is connected with the abrasive collection barrel, the wind speed adjusting device, the wind speed measurer, the feeding homogenizer, the test sample bin and the differential pressure measuring device are mounted on the wind tube, and the contrast sample bin is connected with the test sample bin serially or in parallel. The disadvantages of high performance detection cost and unable complete simulation of onsite practical running conditions of present SCR denitration catalysts are overcome in the invention.

The invention discloses a bioactive bone repair scaffold and a preparation method thereof. The bioactive bone repair scaffold is prepared from, by mass, 55-85% of a degradable polymer serving as a matrix, and 5-15% magnesium lithium silicate and 10-30% of magnesium which serve as a reinforcement phase. The preparation method of the scaffold comprises the following steps of 1) preparation of magnesium lithium silicate hydrogel, 2) preparation of a mixture, 3) preparation of 3D printing raw material particles and 4) 3D printing of the bioactive bone repairing scaffold. The internal and externalstructures of the scaffold can be subjected to customized design, no organic solvent is added, the multi-component interface bonding is good, and the mechanical strength requirement(0.2-80 MPa) of thecancellous bone can be met; self-responding sustained-release of functional ions induces sedimentation of hydroxyapatite on the surface of the scaffold, the bone and cartilage injury can be synergistically repaired, customizedpreparation of the bioactive bone repair scaffold is achieved, and the application prospects of the scaffold in the field of rehabilitation treatment of the bone and cartilage injury and the like are broadened.

The invention discloses a preparation method of a honeycomb sandwich structured wave-absorbing composite filled with leaf-like nano-Fe3O4, and relates to the technical field of electromagnetic stealthcomposites. According to the method, leaf-like alpha-Fe3O4 is synthesized from potassium ferricyanide as a raw material with a hydrothermal method; leaf-like alpha-Fe3O4 is reduced into leaf-like nano-Fe3O4 with a high-heat treatment method, honeycomb holes of a periodic aramid honeycomb board are filled with leaf-like nano-Fe3O4, the upper side and the lower side of the honeycomb board are covered with glass fiber reinforced resin based composite skin and carbon fiber reinforced resin based composite skin respectively, and the honeycomb sandwich structured wave-absorbing composite filled with leaf-like nano-Fe3O4 is obtained. The effective absorption frequency bandwidth at the thickness of 4 mm is 2.6 GHz (in the frequency band range of 12.8 GHz-15.4 GHz), and the maximum absorption strength at 14.2 GHz reaches -36 dB. The technical problems of poor electromagnetic wave absorption intensity and poor mechanical bearing capacity of a traditional wave absorption material are solved.