5results about How to "Performance synergy" patented technology

This application provides a sodium hyaluronate gel and its preparation method, belonging to the field of biomedical materials, aiming to solve the problem of severe performance degradation of cross-linked sodium hyaluronate gels during moist heat sterilization. The gel contains cross-linked sodium hyaluronate and is compounded with a solvation shell-building agent and a high-temperature free radical scavenger. These two agents synergistically constitute a dual protection system, jointly protecting the gel structure. The preparation method includes matrix cross-linking, in-situ loading of the protection system through dialysis equilibrium, homogenization, and terminal moist heat sterilization. After moist heat sterilization at 121°C, the gel of this invention exhibits a high storage modulus retention rate, demonstrating excellent thermal stability and synergistic effects, ensuring stable product performance.

The application discloses a preparation process of a high-performance Cu-Ni-Fe alloy based on first-principle calculation design, and relates to the technical field of alloy material preparation. The process constructs a precise Cu-Ni-Fe ternary alloy thermodynamic database by combining a first principle with a CALPHAD method, determines a composition range based on database calculation of a multivariate phase diagram, optimizes the composition by calculating a work function, an elastic constant and a thermal expansion coefficient through a first principle, and obtains a finished product through smelting, heat treatment and forming processing. The final alloy has an atomic percentage composition of Cu 30%-75%, Ni 10%-30% and Fe 10%-30%, a tensile strength of greater than or equal to 816.4 MPa, a total elongation at break of greater than or equal to 34.27%, and a thermal expansion coefficient of less than 20*10 ‑6 / K, and has excellent mechanical properties and thermal stability, thereby solving the problems of blind composition design and large performance fluctuation of a traditional process and being suitable for multiple fields such as ocean engineering and electronic packaging.

The invention belongs to the technical field of heat management of internal combustion engines, and particularly discloses and provides a collaborative cooling efficiency optimization method for an intercooler and an EGR (exhaust gas recirculation) system, which comprises the following steps: by establishing a collaborative working mechanism of the intercooler and the EGR system, collaborative optimization of comprehensive performance of an engine is realized, and the contradiction between mutual restriction of emission reduction and fuel economy improvement is solved; a control strategy based on multi-target prediction is introduced, the dynamic adaptability and the control precision of the thermal management system are improved, an optimal heat exchange strategy can be formulated in advance, and system parameter fluctuation is maintained within a preset range; by arranging the heat management coupler, redistribution and efficient utilization of heat energy in the engine are achieved, heat energy originally needing to be dissipated in the EGR cooling loop is transferred to the intercooler cooling loop to be used for adjusting the supercharged air inlet temperature, dependence on the total heat dissipation capacity of a cooling system is reduced, energy consumption of cooling accessories is reduced, and the cooling efficiency is improved. Therefore, the overall heat efficiency of the engine is improved.

This invention discloses a high-nitrogen-doped flexible porous carbon fiber membrane based on ammonia-activated flax, its preparation method, and its applications. Using biomass flax fabric as the carbon precursor, the membrane is first pre-carbonized at a programmed rate of 750-850℃ in an inert gas atmosphere, followed by activation treatment at 850-950℃ in a mixed atmosphere of ammonia and inert gas. This invention has the following advantages and effects: Through the aforementioned "Type IV" programmed ammonia activation strategy, this invention achieves simultaneous carbonization, activation, and nitrogen doping in a one-step process using biomass waste as raw material. The process is simple, green, and efficient.

The invention discloses a preparation method of copolyesteramide, which comprises the following steps: (1) putting dibasic acid and dihydric alcohol into a reaction kettle according to the molar ratio of carboxylic acid group to alcoholic hydroxyl group of (2.0-2.1): 1, and carrying out esterification dehydration reaction at 150-190 DEG C for 2-3 hours; performing reduced pressure distillation to remove redundant dihydric alcohol and by-products to obtain ester group-containing dicarboxylic acid; (2) putting dibasic acid, the ester group-containing dicarboxylic acid, aliphatic diamine, lactam, a stabilizer, an end-capping reagent and other auxiliaries into a salifying kettle, and carrying out polymerization reaction at 220-250 DEG C under 1.0-1.8 MPa for 3-5 hours; then vacuumizing until the melt index is 35 to 40g / 10min; and (3) releasing the vacuum, and discharging while hot to obtain the copolyesteramide. According to the invention, the molecular weight and molecular weight distribution of copolyamide can be controlled, so that the whole molecular chain structure is uniform, and collaborative optimization of polyester and polyamide performance is realized to the greatest extent.