32results about How to "In situ generation" patented technology

The invention discloses an in-situ polymerization method for preparation of nylon 6 / epoxide resin / silica dioxide nanocomposite, which consists of the following steps:a)preparing epoxide resin siloxane solution by graft reaction and hydrolytic reaction; b) before or in the aminocaprolactam cycle-open reaction, introducing the epoxide resin siloxane solution into the mediator of the said aminocaprolactam cycle-open reaction, simultaneously adding the water and the anti-oxidant; c) making the aminocaprolactam open ring and polymerize to prepare high-strength and super ductility nylon-6 / epoxide resin / silica dioxide nanocomposite. The invention makes the silicate react with the hydroxy group of the epoxide resin under the accelerating effect, then dissolvent, water and acid (or alkali) are added to hydrolyze. Because the silicasol surface graft and adsorb epoxide resin, the agglomeration of the earth silicon nanoparticles can be effectively avoided. On the other hand, because the epoxy radicals can react with the amidol and the carboxyl of the nylon-6 molecular chain to form partial interpenetration network architecture, accordingly the diphasic boundary action can be effectively improved. It has a good cooperating knife-bar with the nano earth silicon, so it can largely improve the bruise resistance of the materials as well as the hot strength of the composite, in which the hot strength has increased by 30 % compared with nylon-6 and the bruise resistance is 3-5 times of the nylon-6.

The invention relates to a preparation method of a tough and wear-resistant silicon nitride-based composite ceramic, comprising the following steps: (1) by mass percentage, adding 80 to 95% of α-Si 3 N 4 powder and 5~20% C 4 h 6 CoO 4 • 4H 2 After the O aqueous solution is mixed, it is magnetically stirred under heating conditions until the solvent is completely evaporated to dryness to obtain a mixed powder; (2) the mixed powder is crushed through a 100-mesh sieve and put into a steel mold for pre-pressing to obtain a pre-pressed sample; (3) The pre-pressed sample is sintered at high temperature and high pressure, and then cooled with the furnace to obtain a blank; (4) After the blank is subjected to surface polishing treatment, a silicon nitride-based composite ceramic is obtained. The process of the invention is simple and controllable, the production efficiency is high, the powder does not need special treatment, and is suitable for mass production. The prepared finished product has excellent high-temperature toughness and anti-wear performance, and greatly prolongs the service life of ceramic parts in a high-temperature environment.

The invention relates to a low-temperature high-pressure control device for observing aquo-complex generation and decomposition characteristics through an X-ray CT device, and belongs to the field of oil and gas production scientific research apparatuses. A reaction still has design pressure of 0-10 MPa and design temperature of 268-288 K, and the temperature and pressure conditions of aquo-complex generation and stable existence are met. The temperature of the reaction still is controlled through the upper end and the lower end of a semiconductor refrigerating element, noise does not exist, the acting speed is high, reliability is high, and operation is convenient. The reaction still is composed of an inner pipe and an outer pipe, wherein the inner pipe is made from titanium alloy and is mainly used for heat conduction, and the outer pipe is made from polyimide belonging to a low-heat-conductivity material and is mainly used for heat preservation and pressure preservation; according to the characteristics, the heat conduction and the heat preservation and pressure preservation are controlled independently and can be more easily controlled in the terms of engineering. The low-temperature high-pressure control device can be put on a carrying table of the CT device and generate aquo-complex in situ; through the three-dimensional imaging of the CT device, the generation and decomposition characteristics of aquo-complex can be visually studied.

The invention discloses a preparation method and application of a porous MXene hydrogel based on an electrogelling process. The present invention utilizes the electrochemical oxidation process of sacrificial metals, so that MXene can directly and controllably form a hydrogel with porous microstructure on a target substrate. The preparation method is as follows: firstly, a sacrificial metal layer is formed on a target substrate, combined with a standard electrode to form an electrochemical system and placed in an MXene dispersion liquid, and then an electric field is applied to the electrochemical system to complete the electrogelation process. The spatial controllability and precision controllability of this preparation method make it suitable for patterning and controllable modification of porous MXene hydrogels for various electronic devices, which solves the limitation that current porous MXene hydrogels cannot be patterned. The further development of MXene hydrogels in the field of electronic devices provides the possibility.

The invention relates to an AlN-MgB2 particle-reinforced magnesium-base composite material and a preparation method thereof. Nano-level AlN and submicron-level MgB2 which are generated in situ are uniformly distributed on a magnesium-base composite material matrix; the mass percentage of AlN is 5.0-30.0, and the size of AlN is 10nm-100nm; and the mass percentage of MgB2 is 2.0-20.0, and the size of MgB2 is 0.2-0.8 micron. The preparation method comprises the steps of preparing the raw materials in a proportion, carrying out low-speed ball milling on magnesium powder and aluminum powder for 12-48 hours, carrying out high-speed ball milling on the magnesium powder in an argon atmosphere, then carrying out high-speed ball milling on the aluminum powder, boron nitride powder and graphene for 0.5-8 hours, carrying out degassing and packaging on the materials obtained in two ball milling processes, pressing the materials into prefabricated bodies in a cold / hot isostatic press, and maintaining the temperature at 450-680 DEG C for 10-180 minutes by virtue of a vacuum sintering furnace, so as to obtain the AlN-MgB2 particle-reinforced magnesium-base composite material. The preparation method is safe and reliable.

The invention discloses a collagen fiber modification method. The collagen fiber modification method comprises weighing 2-5 parts by weight of collagen fibers, adding the collagen fibers into 200 parts by weight of a barium chloride solution with a concentration of 0.5-2%, carrying out stirring for 4h, carrying out standing for 12h, slowly and dropwisely adding 100 parts by weight of a sodium sulfate or potassium sulfate solution with a concentration of 3% into the mixture under the condition of stirring and a dropwise addition rate of 0.5 drops per second, then carrying out standing for 5min, carrying out suction filtration, carrying out water washing, and carrying out vacuum drying at a temperature of 60-80 DEG C fort 5-8h to obtain the collagen fiber / barium sulfate hybrid material. The modified collagen fibers have low water absorption, high mechanical strength and high heat stability, has the characteristics of flame retardation and antibiosis and greatly widens an application field of collagen fibers. The collagen fiber modification method can be operated simply, realizes a reaction at a normal temperature under normal pressure, has a low equipment requirement and a low raw material cost and is suitable for large scale production.

The invention provides a method for preparing cuprous oxide antibacterial textiles. The method first uses low-temperature plasma to pretreat cellulose fiber fabrics, introduces amino groups on the surface of the fabrics, and simultaneously etches the surface of the cellulose fiber fabrics; Covering silk peptide solution; then padding copper acetate solution, using copper ions and ‑COOH and ‑NH on silk peptide molecules 2 Coordination effect reduces the water solubility of silk peptide, improves the binding fastness of silk peptide, copper ions and textiles; and then forms cuprous oxide in situ on textiles to obtain antibacterial textiles. The obtained fabric not only has good antibacterial property, but also is washable.

The invention discloses a method for preparing a graphene-loaded platinum nano catalyst, which comprises the following steps of: (1) preparing graphene (GNS); (2) preparing polydiallyl dimethyl ammonium chloride (PDDA) functional graphene; and (3) preparing the graphene-loaded platinum nano (Pt / GNS) catalyst. The method has the advantages of uniformly adsorbing and distributing PtCl6<2-> with negative charge on the surface of the GNS through electrostatic adhesion by using positive charge uniformly distributed on the surface of the PDDA-modified GNS, solving the technical problem that metallic particles per se aggregate, realizing higher loading rate of PtNPs and having uniform grain size and controllable size.

The invention discloses a Fenton method for efficiently degrading organic pollutants in water. The method includes the steps: adding magnesium-carbon nano-tube compound particles and iron vitriol intowaste water; stirring mixture under the condition of oxygen inlet; controlling a pH (potential of hydrogen) value of solution to reach acidity; adjusting the pH value of the solution to reach 6-9 after reaction; performing solid-liquid separation, and taking liquid supernatant as treatment outlet water. According to the method, hydrogen peroxide of generated by reaction among magnesium-carbon nano-tubes and oxygen and added ferrous ions act to generate strongly oxidizing species such as -OH, and the organic pollutants in the water are completely mineralized into inorganic substances and removed. The method is wide in raw material source, low in price and cost, simple in process, convenient to operate, mild in reaction condition and applicable to large-scale industrial production, and theorganic pollutants are efficiently degraded.

The invention discloses a coating mechanism, a slit coating device and a film forming method. The coating mechanism comprises: a base, a support platform, a movable support part and a fluid storage tank with nozzles; the support platform and the movable support part Both are fixed on the base; the fluid storage tank is fixed on the movable supporting part to move relative to the pallet driven by the movable supporting part; during the movement of the fluid storage tank, the fluid material in the fluid storage tank passes through the nozzle Apply to the sample to be coated fixed on the pallet to form a film directly. The mechanism, device and method provided by the invention are used to solve the technical problems of high cost and poor film-forming quality existing in the gel polymer lithium ion battery film-forming device and method in the prior art. A slit coating device with low cost and uniform coating is provided.

The invention provides a method for preparing indigo-dyed antibacterial textiles. In the method, the natural indigo is ultra-fine by means of ultrasonic crushing, and then the textile is pad-rolled with an ultra-fine natural indigo dye suspension solution, and the copper salt solution is rolled, and then A one-step hydrothermal method is used to realize the dyeing of indigo dye and the in-situ generation of cuprous oxide on the fabric. The polyvinylpyrrolidone in the suspension solution is not only a dispersant for natural indigo dye, but also can be mixed with Cu when padding the copper salt solution. 2+ Form complexation; in the process of hydrothermal reaction, glucose is not only the reducing agent of natural indigo, but also the Cu 2+ converted to Cu + the reducing agent. The fabric obtained by the method not only has deep color and good color fastness, but also has high antibacterial activity and good washability.