49results about How to "Achieve cross-linking" patented technology

The invention relates to the technical field of fine and deep processing and utilizing of medicines and aquatic products, and aims at providing a preparation method for preparing cross-linked chitosan microspheres with epoxy chloropropane as a cross-linking agent. The preparation method comprises the steps of: firstly preparing chitosan microspheres by an antiphase suspension method, making partial hydroxy on chitosan molecules to participate in cross-linking reaction with epoxy chloropropane as the cross-linking agent, thus converting linear chitosan molecules into reticular high polymer, and preparing cross-linked chitosan microspheres having a porous reticular structure with calcium carbonate as a pore-forming agent. The cross-linked chitosan microspheres prepared by the preparation method provided by the invention can be biodegraded, have good acid and base resistance, better adsorption effect on acid radical ions and proteins, and strong heavy metal ion loading capacity, and can be applied to foodstuff, medicine chemical industry and other fields.

The invention discloses plant-based cellulose fibers with antibacterial, health-care and skin-care functions and a preparation method thereof. Cellulose pulp, pilose asiabell root extract, radix angelicae sinensis extract and isatidis root extract are used as main raw materials, a second-layer capsule wall composite additive and a cellulose fiber spinning stock solution are fully mixed to form a primary blended liquid with high composite additive content, the primary blended liquid is added into the spinning stock solution through a pre-spinning injection device, and the materials are mixed again so that mixing uniformity is improved. The fiber has a Staphylococcus aureus inhibition rate of greater than or equal to 93.8%, an escherichia coli inhibition rate of greater than or equal to 90.2%, a Candida albicans inhibition rate of greater than or equal to 90.8% and multiple fiber amino acid contents of greater than or equal to 3.2mg/kg, and contains 12 kinds of trace elements such as iron, selenium, zinc, potassium, calcium and phosphorus and vitamins B1 and B2. The functional components in the pilose asiabell root, radix angelicae sinensis and isatidis root provide excellent antibacterial, health care and skin care functions for the fibers.

The invention discloses an integrated avionics system for light aircrafts, and belongs to the field of integrated avionics systems of aircrafts. The integrated avionics system comprises a navigation subsystem, a communication subsystem and an indicating/recording subsystem; the communication subsystem comprises an audio control panel, a very high frequency station and an earphone microphone component; the indicating/recording subsystem comprises a primary flight display, a multifunctional display, an integrated processor, an engine parameter collector and an aircraft body state collector; the navigation subsystem comprises a flight environment monitoring system, a posture and direction control system and a radio navigation control system; the integrated avionics system disclosed by the invention can replace the original discrete instrument, reduce the incidence of human errors, improve the utilization rate of indicating contents of the indicating system, reduce the use and maintenance costs of general aircrafts, improve the attendance and the security of the general aircrafts and satisfy the client demands.

The invention relates to a ligament support containing silk fibroin compound oriented nanofiber and a preparation method thereof, and belongs to the technical field of medical apparatus and instruments. The ligament support is prepared from oriented fiber combining silk fibroin with a medical high molecular synthetic material and has a porous three dimensional structure, the mass ratio of the silk fibroin and medical high molecular synthetic material in the compound oriented fiber is (1-20):(1-1), the diameter of the compound oriented fiber is 500nm-10000nm, the thickness of the ligament is 1mm-10mm, and the width of the ligament is 1mm-15mm. The ligament support has a uniform microstructure and good biocompatibility, provides a matrix structure for growing of ligament cells, and can be used for increasing the tensile strength of the ligament due to the compound fiber orientated structure. The ligament support is simple in preparation method and convenient to operate, the preparation process is controllable, and the preparation method is suitable for preparing the ligament supports of various sections and lengths.

The invention relates to a method for preparing polyacrylonitrile, an acrylonitrile copolymer and a mixture material thereof. One or multiple radiation cross linking is carried out from normal temperature to 135 DEG C under the condition of an inert atmosphere or air to obtain the crosslinking polyacrylonitrile, the acrylonitrile copolymer and the mixture material thereof with excellent mechanical performance and heat resistance. The crosslinking polyacrylonitrile, the acrylonitrile copolymer and the mixture thereof prepared by the method are applied to carbon materials, such as carbon fibers, carbon pipes, carbon films, carbon felt, carbon rods, and the like and a composite material thereof and can greatly improve the strength and the modulus of the materials, improve the heat resistance and have simple process.

The invention provides cross-linkable and re-dispersible polymer powder with high adhesive property as well as a preparation method and use of the polymer powder. The polymer powder is prepared from a single olefinic bond unsaturated monomer unit with hydroxymethyl or carbonyl, a single olefinic bond unsaturated monomer unit with carboxyl and hydroxyl, an unsaturated monomer unit formed by a (methyl) alkyl acrylate and vinyl aromatic compound of non-branched or branched alcohol with 1-15 carbon atoms, and water-soluble polymer protective colloid. The polymer powder disclosed by the invention has excellent self-adhesive performance and substrate bonding performance; the polymer powder and the aqueous dispersion thereof can be subjected to cross-linking reaction in the constructing and drying processes by virtue of the foundational groups such as hydroxymethyl, carbonyl, carboxyl, hydroxyl and the like, so as to achieve excellent self-adhesive performance and substrate bonding performance.

The invention discloses a method for preparing underwater self-healing hydrogel. The method comprises the following steps: respectively modifying adenine and thymine so as to obtain a base monomer bound with double bonds; taking water as a solvent, performing thermal initiation with a hydrophilic monomer methacrylamide by virtue of an initiator potassium persulfate, and performing free radical polymerization to form a high polymer of a three-dimensional meshed structure, thereby obtaining the self-healing hydrogel from the polymer by virtue of complementary pairing hydrogen-bond interaction of DNA base-pairs. According to the method disclosed by the invention, the hydrogel has excellent self-healing property in air and under the water by virtue of the hydrogen-bond interaction among the bases. The problem that the traditional hydrogel cannot be self-healed under the water is solved, and the service life of the hydrogel in water and in a wet environment is prolonged. The design thought in the invention provides a novel thought for development of the underwater self-healing hydrogel in future.

The invention discloses a preparation method of cross-linked polyimide fiber membrane. Firstly, polyamide acid with a certain solid content is synthesized, then through electrostatic spinning, polyamide acid nanofiber membrane is prepared, and then through hot-pressing amination treatment, polyimide nanofiber membrane is obtained; the prepared polyimide nanofiber membrane is soaked in a polyamideacid solution with a certain solid content for standing for a certain time, finally, the soaked fiber membrane is subjected to gradient heating and hot-pressing amination treatment, and thus the polyimide fiber membrane with a certain cross-linking degree is prepared. The method is simple in implementation process, adjustable and controllable in cross-linking degree, low in cost, suitable for allkinds of polyimides and good in application prospect.

The invention relates to a preparation method of a metal ion adsorbent and belongs to the technical field of adsorbents. According to the preparation method, bamboo is adopted as a carrier, pores in the bamboo are increased through a steam blasting method, an internal structure of the bamboo is destroyed, the adsorption performance is improved, and then the bamboo is put into a carbonization furnace for pre-carbonization; complete carbonization of the interior of the bamboo is avoided through pre-carbonization, internal materials of the bamboo are partially decomposed or degraded, the adsorption and binding capability is improved, and then composite glue and sea mud are added; active substances in the sea mud can be well combined with the composite glue to achieve wrapping of pre-carbonized particles, metal substances in the sea mud are utilized to promote cross-linking in the composite glue for improving the adsorption performance, the composite glue is cross-linked with acrylic acidunder the action of sodium hydroxide, and under the action of N,N-dimethyl amide and sodium hydrosulfide, sulfydryl is added to the surface of the adsorbent, so that the adsorption performance for metal ions is improved.

The invention relates to a preparation method of carbon nanotube fibers with high tensile strength and belongs to the technical field of nanometer materials. The preparation method comprises the first step of preparing primary carbon nanotubes; the second step of functionalizing the carbon nanotubes and conducting plasma treatment on the primary carbon nanotubes through ethylene diamine or propylene diamine to obtain functionalized carbon nanotubes, wherein helium or nitrogen or oxygen is adopted as carrier gas in the plasma treatment process; the third step of making carbon nanotube fibers subjected to crosslinking reaction; the fourth step of removing organic diluents at the temperature between 50 DEG C and 200 DEG C to obtain the carbon nanotube fibers with high tensile strength. Compared with the prior art, the preparation method has the advantages that amino-functionalized carbon nanotubes are obtained, and the tensile strength is further enhanced by twisting a certain angle; by the adoption of a mixed solution of glycidyl amine and diluents, epoxy groups on the surface of the glycidyl amine can easily make contact with amino of the amino-functionalized carbon nanotubes and achieve crosslinking, so that the crosslinking rate is increased.

The invention discloses a high-melt-strength copolyoxymethylene and a preparation method thereof, and belongs to the technical field of copolyoxymethylene. The preparation method comprises the following steps: carrying out a polymerization reaction on trioxymethylene, a comonomer, an initiator, a multi-element chain transfer agent or a mixture of the multi-element chain transfer agent and a chainextender in a double-screw reactor at 50-70 DEG C to complete branching and crosslinking copolymerization so as to obtain a polyformaldehyde powder; and mixing the polyformaldehyde powder with a high-efficiency trace additive, melting and plasticizing the obtained mixture at 180-230 DEG C through a thermal devolatilization process, and cooling and granulating the mixture to obtain the high-melt-strength copolyformaldehyde product. Branching and crosslinking of polyformaldehyde molecular chains are ingeniously achieved through the multi-element chain transfer agent or the mixture of the multi-element chain transfer agent and the chain extender, and the high-efficiency trace additive is used to improve the stability of the polyformaldehyde powder and reduce the loss of the melt strength caused by assistants.

The invention discloses a high-strength moisture-resistant oxygen-resistant heat-resistant high-density polyethylene film. Raw materials in parts by weight of the film include: 80-120 parts of high density polyethylene, 30-50 parts of EVA resin, 3-6 parts of ethylene-vinyl acetate copolymer, 4-8 parts of tertiary butanol hydrogen peroxide, 2-5 parts of zinc stearate, 3-9 parts of alumina, 8-12 parts of organic montmorillonite, 5-15 parts of bentonite, 4-8 parts of kaolin, 6-9 parts of diatomite and 4-9 parts of a silane coupling agent KH-550. The invention also provides a preparation method of the high-strength moisture-resistant oxygen-resistant heat-resistant high-density polyethylene film. The prepared high-density polyethylene film has high strength and excellent moisture-resistant, oxygen-resistant and heat resistant properties.

The invention discloses a waterproof breathable fabric which comprises a comfortable inner layer and a functional film coating the surface of the comfortable inner layer. The thickness of the functional film is 60-80 micrometers; the waterproof breathable fabric is manufactured through the steps of 1 preparing the comfortable inner layer, 2 preparing a coating adopted by the functional film and 3uniformly coating the surface of the functional inner layer with the coating for the functional film. The fabric comprises the comfortable inner layer and the functional film coating the surface of the inner layer, the comfortable inner layer is formed by manufacturing suplon fiber and modified viscose fiber, and the comfortable inner layer has the breathable, wearing comfortable, anti-flaming andother performances; the functional film adopts polyether copolymer acetamide resin as a film matrix, modified nanometer silicon dioxide is added, the porosity of the film is increased on the basis ofkeeping the good hydrophobic performance, the breathability of the film is ensured, the purposes of breathability and waterproofing are perfectly achieved, and the fabric is the novel healthy and environment-friendly fabric.

The invention relates to the technical field of modified asphalt mixtures, in particular to an SBS latex modified asphalt mixture and a warm-mixing direct-feeding preparation process thereof, and the mixture comprises the following components in percentage by mass: 93-96% of primary aggregate, 3-7% of matrix asphalt, 0.3-1.2% of SBS latex and 0.03-0.12% of cross-linking agent. The cross-linking agent is formed by mixing elemental sulfur, a super vulcanization accelerator and organic peroxide. The method comprises the following process steps: firstly, heating aggregate to a certain temperature, putting the aggregate into a stirring cylinder, then spraying a mixed solution of SBS latex and a cross-linking agent into the stirring cylinder under the action of special conveying equipment while adding matrix asphalt, and discharging the product after fully stirring. The SBS latex is directly fed into a mixing cylinder, so that a common matrix asphalt mixture or a warm-mixed (hot-mixed) recycled asphalt mixture is prepared into the SBS modified asphalt mixture; the problems of aging, high pollution, gel, insufficient crosslinking, storage segregation, high-temperature heat preservation and the like of modified asphalt are solved.

The invention discloses a preparation method of a quantum dot film, which comprises the following steps: carrying out mixed reaction on organic amine and dithiol to generate a complexing product, andseparating from the complexing product to obtain a first complexing molecule in which a first sulfydryl group in the dithiol is combined with an amino group in the organic amine; carrying out ligand exchange on the first complexing molecule and a quantum dot surface ligand, so that the first complexing molecule is combined on the surface of the quantum dot through a second sulfydryl to obtain thequantum dot of which the surface is combined with the first complexing molecule; and depositing the quantum dots of which the surfaces are combined with the first complexing molecules on a substrate,and annealing to obtain the quantum dot film. The preparation method of the quantum dot film provided by the invention is simple and easy to realize, and the prepared quantum dot film can realize quantum dot crosslinking and has excellent electrical conductivity.