8results about How to "High retention performance" patented technology

The invention discloses heat-resistant modified epoxy resin and a preparation method thereof, and belongs to the technical field of high polymer materials. The heat-resistant modified epoxy resin is prepared from the following components in parts by mass: 45 to 55 parts of matrix epoxy resin, 10 to 20 parts of methyl phenyl silicone resin, 8 to 12 parts of nano silicon dioxide, 0.8 to 2.0 parts of a silane coupling agent, 6 to 10 parts of a curing agent, 0.3 to 0.8 part of an accelerant, 15 to 30 parts of silica fume powder and 0.5 to 1.2 parts of an antioxidant. By introducing components such as methyl phenyl silicone resin and nano silicon dioxide with a specific particle size, and combining the synergistic effect of the silane coupling agent, the heat resistance of the epoxy resin is effectively improved; the antioxidant with a specific structure is used, and the performance retention rate of the modified epoxy resin under a thermo-oxidative aging condition is remarkably improved, so that the service life of the material is prolonged, and the long-term stability of the material in a high-temperature environment is enhanced.

The application discloses weather-resistant polyester and a preparation method thereof, and relates to the technical field of polyester fibers. The weather-resistant polyester is prepared from the following components in parts by mass: 90-110 parts of polyethylene terephthalate resin, 1-2 parts of a weather-resistant agent, 2-5 parts of a dispersing agent, 1.5-3 parts of a lubricant, and 5-15 parts of a nano functional filler. The weather-resistant agent is added to efficiently absorb ultraviolet light, block photoaging chain reactions, reduce performance degradation of the polyester in adverse environments such as ultraviolet light and heat and moisture, and effectively delay the aging process.

This invention discloses an electrochemical synthesis method for electrochromic Prussian blue films and a flexible electrochromic device, belonging to the field of electrochromic material preparation technology. The method includes three steps: preparing an electroplating solution, electrochemical deposition, and post-treatment. The electroplating solution uses deionized water as a solvent and contains a main salt, secondary salt, complexing agent, and surfactant, with the pH adjusted to 2.0–2.5. Electrochemical deposition employs a constant potential method, with a deposition potential of 0.65–0.85 V, a time of 300–600 s, and a temperature of 25–35 °C. Post-treatment involves rinsing and drying to obtain the product. This invention solves the problem of easy precipitation in the plating solution through a complexing agent compound system and precise pH control, achieving a plating solution stability of over 24 hours. The prepared film is uniform and dense with excellent electrochemical performance. It also provides a matching flexible electrochromic device, suitable for large-scale production, and has broad application prospects.

The application discloses a gas diffusion module of a fuel cell, a fuel cell and a preparation method. The gas diffusion module comprises a substrate layer and a microporous layer which are arranged in sequence. The substrate layer is provided with a first hole group and a second hole group. The first hole group and the second hole group are both provided with micro-perforations. The hydrophobicity of the micro-perforations on the first surface is greater than that on the second surface. The pore diameter of the micro-perforations located in front of the air flow direction in the first hole group and the second hole group is greater than that of the micro-perforations located behind the air flow direction. Alternatively, the opening density of the micro-perforations located in front of the air flow direction in the first hole group and the second hole group is greater than that of the micro-perforations located behind the air flow direction. On any homologous line perpendicular to the air flow direction, the opening density of the micro-perforations of the first hole group is greater than that of the micro-perforations of the second hole group, and the pore diameter of the micro-perforations of the first hole group is smaller than that of the micro-perforations of the second hole group. The water in different positions of the cathode surface is kept relatively balanced, and water accumulation and excessive water loss are prevented.

The application provides an air atmosphere near-infrared laser sinterable oxidation-resistant copper paste and a preparation method thereof, and the main body of the paste is Cu@glass, which comprises a copper core, and a Bi2O3-B2O3-ZnO glass shell layer with a mass fraction of 5%-20% coated outside the copper core, and the particle size of the copper core is 200 nm-500 nm. The copper paste prepared by using the Cu@glass material greatly improves the near-infrared laser absorption efficiency and oxidation resistance of the Cu@glass particles under the coating structure of the glass shell, and the initial oxidation temperature and the near-infrared light absorption rate of the 10% glass-coated Cu@glass particles are 294 DEG C and 61.8% respectively, so that the stable necking and densification of the copper paste under the irradiation of the near-infrared laser are realized under the condition of the air atmosphere, and a copper conductor film layer with conductivity is obtained.

The invention provides cigarette paper with a temperature change indication function and a preparation method thereof, and relates to the field of cigarette paper. The cigarette paper with the temperature change indication function comprises a body paper base material and a temperature change functional coating, a micro-cavity array area is formed on the surface of one side of the body paper base material, the temperature change functional coating is coated on the micro-cavity array area on the surface of the body paper base material, and paint forming the temperature change functional coating comprises a thermochromic material and an adhesive. The micro-cavity array area is formed on the surface of one side of the body paper base material, and the temperature change functional coating is coated on the micro-cavity array area on the surface of the body paper base material, so that the temperature change functional coating is anchored in the micro-cavity, the temperature change functional coating is effectively and physically protected, stable integration of the temperature change functional coating is realized, and the temperature change functional coating is effectively prevented from being damaged. And meanwhile, a foundation is laid for realizing a precise regionalization indication function.

This invention relates to the interdisciplinary fields of digital healthcare, wireless sensing, signal processing, and artificial intelligence, specifically a controllable data augmentation method for radar respiratory monitoring based on parametric environment modeling. This data augmentation method first acquires a clean radar respiratory signal, constructs four types of models with physical constraints and corresponding parameter spaces, and calculates the ground truth values ​​for each interference. Then, based on the physical mechanism, it synthesizes a noisy signal through convolution / time-varying filtering, phase modulation, and additive superposition operators, forming a quadruple data set containing the clean radar respiratory signal, the noisy signal, the ground truth values ​​of interference, and model parameters. After batch generating the dataset, multi-level physical fidelity verification is performed; if the fidelity is not met, subsequent parameter tuning is conducted: scene fingerprints are extracted from real monitoring data, mapped to obtain parameter adjustment amounts, and the parameter space is updated. This invention solves the problems of missing physical modeling and unreasonable synthesis mechanisms, effectively improving the accuracy of simulation data, model generalization ability, and robustness of respiratory monitoring.

The invention belongs to the field of high polymer material science and engineering, and discloses a low-odor high-flame-retardant rubber material for a special-shaped bent pipe of an automobile cooling system and a preparation method of the low-odor high-flame-retardant rubber material for the special-shaped bent pipe of the automobile cooling system. According to the material, the processability and strength are balanced by compounding high / low Mooney chloroprene rubber (40-60: 60-40), and efficient flame retardance is achieved by combining 30-50 parts of phosphorus-nitrogen intumescent flame retardant; and 10-20 parts of DOTP plasticizer and 2-5 parts of special porous adsorbent are adopted to reduce VOC and odor. The preparation method comprises the steps of staged mixing, steam vulcanization, hot air catalysis-hot water extraction deep purification, drying and packaging. The main body structure of the special-shaped bent pipe and the via hole rubber sleeve are both made of the material and are integrally formed through a sleeve core rod and fixed through secondary hot pressing, and the strict requirements of an automobile cooling system for heat resistance, flame retardance and low odor are met.