35results about How to "Keep excellent performance" patented technology

The invention discloses a preparation method of a graphene/carbon fiber composite. The preparation method comprises the steps: firstly, with graphite powder or natural flake graphite as the raw material, directly and ultrasonically stripping the graphite powder or natural flake graphite in an organic solvent to prepare a graphene dispersing solution; then, adding an organic amine salt with aromatic groups into the obtained graphene dispersing solution to enable the graphene to have positive charges because of adsorbing organic amine ions; next, depositing the graphene with the positive charges on carbon fiber or a carbon fiber product under the action of an external electric field to form the graphene/carbon fiber composite with the organic amine salt; and finally, removing the organic amine salt through thermal treatment to obtain the graphene/carbon fiber composite, wherein the organic amine salt is deposited in an electrophoresis deposition process. The method has the advantages of simplicity in operation, low cost, good uniformity of the graphene/carbon fiber composite, easiness for control and the like.

A process for preparing the aramid fiber pulp features that the leftover of aramid fibre is physically treated to become microfibrils with large specific surface area. It can be used as friction material, sealing material and filler.

The invention provides biological fermentation active carrier type composite premix feed as well as a preparation method and an application thereof. The preparation method comprises the following steps: preparing probiotics biological fermentation active carriers, to be specific, respectively carrying out liquid fermentation cultivation by using lactobacillus acidophilus LA0912, enterococcus faecalis EF1109, bacillus subtilis BS0903 and saccharomyces cerevisiae SC1203, mixing obtained liquid according to a volume ratio being 1: 1: 1: 1, then carrying out solid fermentation cultivation, drying an obtained solid fermentation culture at lower temperature and grinding so as to obtain the biological fermentation active carriers; compounding the biological fermentation active carriers with vitamins, amino acids, minerals, organic trace elements, choline chloride and table salt so as to obtain the biological fermentation active carrier type composite premix feed suitable for pigs at different stages. The biological fermentation active carrier type composite premix feed gives play to the health function of probiotics, makes the best of multiple biological activity effects of probiotics fermentation metabolites and can meet the physiologic nutritional requirements of pigs at different stages.

The invention discloses a method for preparing a water-phase graphene dispersion liquid by employing ultrasonic stripping. The method comprises the following steps: adding 1 part of graphite to 500-10,000 parts of a lignin amphiphilic polymer solution with the mass concentration of 0.1-10g/L; carrying out ultrasonic stripping at 20-60 DEG C for 10-100 hours by virtue of an ultrasonic cleaning machine; and then centrifugally separating to obtain the graphene dispersion liquid. According to the method disclosed by the invention, a lignin amphiphilic polymer is adopted as a natural polymer dispersant of water-phase graphene for the first time; the graphene in the prepared dispersion liquid is few in structure defect and few in layers; the lowest concentration is 0.1g/L; the excellent performance of the graphene is well reserved; the method can be widely applied to the fields such as catalysts, sensors and conducting materials; the method disclosed by the invention is economical and environment-friendly; the utilization rate of raw materials is improved; and the industrialization cost is reduced.

The invention discloses a polylactic acid/nucleating agent modified cellulose nanocrystalline composite material and a method. The preparation method is characterized by comprising the following steps: modifying cellulose nanocrystals by using a polyamides nucleating agent with a self-assembly capability to obtain modified cellulose nanocrystals with a needle-like or rod-like self-assembly structure, and compounding the modified cellulose nanocrystals with polylactic acid to obtain the polylactic acid/cellulose interface structure with a shish-kebab form. The nucleating agent with self-assembly capability and capable of forming rod-like and needle-like structures is selected, and hydroxyl of cellulose and amino of the nucleating agent form hydrogen-bond interaction, so that adsorption of the nucleating agent on the surface of the cellulose is realized, damage to a cellulose structure is avoided, and excellent performance of the cellulose is reserved to the greatest extent.

The invention discloses a method for preparing graphene by combining ultrasonic peeling and jet flow peeling. The method comprises the steps that firstly, graphite is dispersed in an aqueous surfactant solution; secondly, the mixed liquid obtained in the first step is subjected to ultrasonic peeling, and multilayer graphene dispersion liquid is obtained; thirdly, the multilayer graphene dispersion liquid obtained in the second step is subjected to jet flow peeling, and monolayer graphene dispersion liquid is obtained; fourthly, the monolayer graphene dispersion liquid obtained in the third step is dried, and the graphene is obtained. According to the preparation method, the ultrasound and jet flow combined peeling mode is adopted for the first time, the obtained graphene in the dispersion liquid has few structural defects and layers and high concentration, the excellent performance of graphene is retained very well, and the graphene can be widely applied to the fields of automotive parts, sensors, conductive materials, heat conduction materials and the like. The method is economical and environmentally friendly, the raw material utilization rate is increased, and the industrialization cost is reduced.

The invention discloses a method for preparing graphene powder and dispersion thereof from fluorine-containing hyperbranched polyethylene copolymers. The method includes catalyzing bromine-containingmonomers and ethylene by the aid of alpha-diimine palladium catalysts to carry out copolymerization so as to obtain bromine-containing hyperbranched polyethylene copolymers; initiating fluorine-containing monomers by the aid of the obtained bromine-containing hyperbranched polyethylene copolymers to carry out copolymerization at terminals of hyperbranched polyethylene branch chains so as to obtainthe fluorine-containing hyperbranched polyethylene copolymers; exfoliating graphite powder in organic solvents by means of ultrasonic or high-speed stirring by the aid of the obtained fluorine-containing hyperbranched polyethylene copolymers which are used as stabilizers so as to obtain graphene dispersion; removing free polymers in the graphene dispersion by means of vacuum suction filtration orcentrifugation to obtain the graphene powder with the surfaces modified by fluorine-containing polymers and ultrasonically dispersing the graphene powder in appropriate organic solvents to obtain graphene dispersion with surfaces modified by the fluorine-containing polymers. The method has the advantages that the method is high in preparation efficiency, graphene has few structure defects, and processes are simple and are easy to scale up; the graphene obtained by the aid of the method has a broad application prospect in the field of fluorine-containing polymer composite modification.

The invention provides a pressure pouring device for phosphoric pig iron for assembling a prebaked anode. An opening of a carbon bowl is closed through a pouring mold so that the carbon bowl can be inthe closed state; and the liquid phosphoric pig iron is pressure-poured into the portion, between the prebaked anode and a steel claw, of the carbon bowl through a pressure jet punch so that the mold-filling capacity of the liquid phosphoric pig iron can be improved, close connection between the prebaked anode and the steel claw can be achieved, the tension resistance can be improved, and connection pressure reduction can be lowered. The invention further provides a pouring method of the pressure pouring device for the phosphoric pig iron for assembling the prebaked anode.

The invention discloses hyperbranched polysulfone with controllable branching degree and a preparation method thereof. The method comprises the following steps: 1) generating bisphenol salt from an organic bisphenol compound and a salt-forming agent in a non-water-soluble hydrocarbon solvent; 2) adding a solution of 4, 4'-dichlorodiphenyl sulfone/aprotic polar solvent into a bisphenol salt system,and carrying out condensation polymerization under the catalytic action of a condensation polymerization catalyst to generate linear polysulfone; 3) adding a chloromethylated polysulfone/aprotic polar solvent solution into the system, and reacting to generate hyperbranched polysulfone; and 4) separating out the product in a precipitation agent, and carrying out a post-treatment process to obtainhyperbranched polysulfone powder. Compared with a traditional method for preparing hyperbranched polysulfone, the method has the advantages that expensive polyfunctional monomers do not need to be adopted, so that the cost is greatly reduced; the molecular weight distribution of the obtained product is narrow, the gelation phenomenon is avoided, the branching degree can be controlled by selectingpolysulfones with different chloromethylation degrees, and the method is simple and easy to operate.

The invention provides a preparation method of a bamboo-based hybrid fiber felt for a VARTM molding composite material. The method comprises the following steps: firstly, putting bamboo fibers into a distilled water solution, stirring until the bamboo fibers are dispersed, and sorting out standard bamboo fibers; uniformly dispersing the standard bamboo fibers in a sieve, placing the sieve in a wet-process layer laying device, and immersing the sieve in an ultrasonic device filled with different solvents for treatment; adding one or more other fibers into the sieve, carrying out ultrasonic treatment, standing, pre-pressing, evaporating the solvent in the fibrofelt, and taking out the formed bamboo-based hybrid fibrofelt; and repeating the above steps on bamboo fibers and other fibers which are equal in mass to obtain a plurality of formed bamboo-based hybrid fiber felts, sequentially stacking and pressing the fiber felts in the sieve to obtain a bamboo-based hybrid fiber felt, and naturally airing and drying the bamboo-based hybrid fiber felt to obtain a bamboo-based hybrid fiber felts for the VARTM formed composite material. The process steps are simple and convenient, the bamboo fibers and other fibers can be uniformly mixed and dispersed, and damage in the mixing preparation process of different fibers is also avoided.

The invention discloses an Adam-based optimization method, system and terminal. The method comprise the following steps: inputting a training sample into a to-be-optimized Adam model with one or moremodel parameters to obtain a prediction result; comparing the prediction result with the real result, and respectively combining the prediction result with the size information of each model parameterunder the historical parameter gradient to obtain the size information of each model parameter under the updated gradient; obtaining a correction coefficient corresponding to the optimized Adam modelaccording to the training sample and the learning intensity value related to the optimized Adam model; obtaining a correction update amount of each model parameter so as to obtain an Adam optimization model used for obtaining an optimization prediction result. The method is used for solving the problem that the requirements of high accuracy and higher convergence rate of an algorithm cannot be met in the prior art for huge data volume. According to the method, model parameters are improved on the basis of an Adam model, and the convergence rate and the final accuracy are further remarkably improved while the excellent performance of the Adam is reserved.

The invention belongs to the field of carbon nanomaterials, and particularly relates to a low-cost preparation process for preparing three-dimensional porous graphene. According to the invention, the selected carbon source takes the waste coal gangue as a basic raw material so that resource reutilization of the waste coal gangue is realized, materials can be saved, and energy consumption can be reduced. The metal catalyst is added, so that the graphitization process is accelerated, the graphite temperature is reduced, the graphitization degree is increased, the interlayer spacing is increased, intercalation is easier, and the quality of graphene obtained by stripping is higher. In-situ self-assembly is carried out by using a graphene oxide aqueous solution as a precursor, so that stacking among graphene sheet layers is effectively reduced, and excellent performance of graphene is retained. The three-dimensional porous graphene with relatively high quality is prepared by adopting a low-cost preparation process and a low-cost carbon source, and can be prepared in a large scale so that research and development of downstream products such as pollutant adsorption, resistance type gas sensors, lithium ion batteries, supercapacitors, modified cement concrete and the like are facilitated.

The invention relates to hydrophobic organic polysilazane as well as a preparation method and application thereof, and belongs to the technical field of organic polysilazane preparation. According to the method, fluorochlorosilane with fluorine-containing branched chains and chlorosilane are selected as reaction raw materials, hydrophobic organic polysilazane is synthesized through polycondensation by a one-step method according to the principle of chlorosilane ammonolysis polycondensation, and by means of molecular structure design, the Si-N bond structure of the main chain of a polysilazane molecule is reserved, so that the excellent performance of the polysilazane material is reserved; the fluorine-containing branched chain of the fluorochlorosilane is increased along with the increase of the Si-N main chain in the polycondensation process by controlling parameters such as temperature and reaction time, the branched chain is changed into a hydrophobic group, the hydrophobicity is improved, and the average hydrophobic angle of the polysilazane can reach 114 degrees or above. The polysilazane is colorless transparent liquid and can be self-cured to form a film at room temperature, complex processes such as compounding of various solutions, repeated coating or heat treatment and the like when the coating needs to be used are avoided, the using method is simplified, and the coating is uniform, transparent and high in light transmittance.