21results about How to "Low mechanical strength" patented technology

This application relates to a femtosecond laser multi-degree-of-freedom personalized reshaping method and system for intracorneal implants, belonging to the field of femtosecond laser processing technology. Utilizing the cold processing characteristics of femtosecond lasers, the intracorneal implant is individually cut and ablated to obtain the desired three-dimensional corneal shape, precisely shaping the curvature, thickness, and contour of the lens to perfectly match the patient's corneal capsule or lesion area. By leveraging the nonlinear optical effect induced at the focal point of the femtosecond laser, the stromal collagen network in the weak areas corresponding to corneal expansion can be densified through laser processing, significantly improving the local elastic modulus and resistance to deformation. In areas requiring a smooth transition with the recipient cornea or adjustment of refractive power, controllable micropores or low-density areas can be induced, appropriately reducing local stiffness, thereby achieving a spatial gradient distribution of internal mechanical properties and customizing the overall mechanical behavior and morphological stability after implantation.

This invention relates to the field of polymer foaming materials technology, and discloses a plant fiber composite nucleating agent for microfoaming of biodegradable materials and its application. The plant fiber composite nucleating agent is made from raw materials comprising the following parts by weight: 80-95 parts of primary ultrafine plant fiber powder, 5-20 parts of surface modifier, and 0.1-5 parts of dispersing lubricating wax; the surface modifier and dispersing lubricating wax are coated on the surface of the primary ultrafine plant fiber powder. The application steps are as follows: adding the plant fiber composite nucleating agent to a biodegradable material matrix to obtain a pre-foaming blend, introducing foaming gas or adding a chemical foaming agent for foaming treatment. The nucleating agent of this invention improves the compatibility between plant fibers and hydrophobic biodegradable matrices, provides heterogeneous nucleation sites in the matrix while increasing the polymer melt strength, inhibits cell coalescence and rupture, and obtains microfoamed materials with uniform pore size. Furthermore, the nucleating agent itself is completely biodegradable.

The invention relates to the field of gypsum-based building materials, and particularly discloses a preparation method of a lysine-tannic acid compound retarder and a gypsum-based building material.The preparation method comprises the following steps that 1, tannic acid and copper acetate are added into water to be stirred, and a copper-tannic acid pre-coordination solution is obtained; then adding L-lysine into the mixture, and stirring for reaction to obtain precursor liquid after the reaction is completed; and (2) adding glyoxal into the precursor liquid for reaction, and then adding dialdehyde polyethylene glycol for continuous reaction to obtain the compound retarder. The gypsum-based building material comprises the following components: alpha-semi-hydrated gypsum, cement, slag powder, the lysine-tannic acid compound retarder, a water reducing agent and mixing water. The retarder provided by the invention not only has a good retarding effect on the gypsum-based building material, but also can improve the early strength of the gypsum-based building material, and effectively overcomes the contradictory problem of retarding and early strength.

The powder material for additive manufacturing disclosed herein includes tungsten carbide (WC), cobalt (Co), and a carbon additive including carbon (C) as a main constituent element, and the value of a carbon content A (% by mass), which is represented by the following formula: [(mass of C derived from WC) + (mass of C derived from carbon additive)] / (mass of WC) × 100, satisfies the condition of 6.4 ≤ A ≤ 7.2.

This utility model provides a pressure relief and explosion-proof structure for an electromagnetic unit and a capacitive voltage transformer, belonging to the field of capacitive voltage transformers. It includes an electromagnetic unit with a pressure relief and explosion-proof structure. The structure includes a pressure relief hole on the outer casing of the electromagnetic unit, and a pressure relief plate detachably mounted on the outside of the pressure relief hole. The pressure relief plate is made of transparent material, and an oil level line is provided on its surface. The beneficial effect of this utility model is that it integrates explosion-proof pressure relief and oil level observation functions into one unit, enabling both pressure safety release and oil level monitoring, thereby reducing equipment complexity and maintenance costs, and providing a better solution for the safe and stable operation of capacitive voltage transformers.

The invention provides an acellular matrix fiber woven scaffold as well as a preparation method and application thereof, and belongs to the technical field of biomedical materials. The acellular matrix fiber woven scaffold comprises a woven structure unit, wherein the woven structure unit comprises warp yarns and a plurality of acellular matrix fiber weft yarns; the acellular matrix fiber is prepared by cutting an acellular matrix paper-based material at equal intervals; the plurality of acellular matrix fiber wefts are arranged in parallel according to a bionic trend and are interwoven and fixed through the warps, so that a bionic pattern simulating natural tissue fiber arrangement is formed in the weaving structure unit. The acellular matrix fiber scaffold is prepared by innovatively applying a weaving technology, the scaffold can improve the cell loading efficiency, is beneficial to self-repair and reconstruction of damaged tissues, provides suitable survival and growth conditions for cells, and has good application prospects in the field of biomedical engineering, especially in the aspects of tissue repair and regenerative medicine. And huge application potential is shown.

The invention relates to the technical field of aerogel materials, in particular to a high-thickness glass fiber-carbon fiber composite silica aerogel felt and a preparation method thereof. According to the method provided by the invention, tetraethoxysilane is taken as a silicon source, heptaisobutyltrisilanol polyhedral oligomeric silsesquioxane (POSS) is taken as a matrix modifier, glass fibers are modified by a KH560 silane coupling agent, and carbon fibers are subjected to oxidation grafting treatment, so that strong interface bonding of the fibers and a SiO2 / POSS matrix is realized; and the silica aerogel felt with ultralow heat conductivity, high mechanical strength and excellent temperature resistance is prepared through the processes of sol preparation, gradient gelation, layered laying, felt body forming, drying post-treatment and the like. The problems that a traditional aerogel felt is low in mechanical strength, insufficient in temperature resistance, weak in matrix and fiber interface bonding force and prone to structure cracking are solved, the heat conductivity coefficient of the prepared silica aerogel felt is smaller than or equal to 0.025 W / (m.K), and the tensile strength is larger than or equal to 10 MPa.

The invention relates to an adhesive and a preparation method thereof, a solar cell and a photovoltaic module. The adhesive comprises a component A and a component B, the component A is prepared from the following components in parts by weight: 30 to 50 parts of epoxy resin and 20 to 30 parts of organic silicon modified polyethersulfone resin; the component B comprises a curing agent. The organic silicon modified polyethersulfone resin is obtained by reacting hydroxyl-terminated polyethersulfone resin with an epoxy silane coupling agent. The organic silicon modified polyethersulfone resin improves the fracture toughness, flexibility and bonding strength of a system by introducing a flexible chain segment and a tough polymer, and is matched with the epoxy resin to form a protective adhesive layer with excellent flexibility, aging resistance and corrosion resistance. The adhesive is coated on the edge area of the cutting edge of the battery piece to form a protective adhesive layer, so that the reduction of mechanical strength caused by defects of the edge area of the cutting edge of the battery piece is made up, and the condition that the battery piece is broken in the static load and dynamic load processes of the photovoltaic module is reduced.

This invention provides a ceramic proton exchange membrane for microbial fuel cells and its preparation method, comprising the following steps: mixing clay, an inorganic modifier, and an organic modifier to obtain a solid powder; the inorganic modifier is alumina and silicon dioxide, and the organic modifier is selected from one or more of wheat flour, biochar powder, straw powder, and bamboo powder; the solid powder is ball-milled, granulated, pressed into sheets, and calcined to obtain the ceramic proton exchange membrane. This invention addresses the problems of poor mass transfer performance and low power generation performance of traditional pure clay ceramic membranes. Using clay as the matrix material, and through specific inorganic and organic modifiers, the pore structure of the material is adjusted. A novel ceramic proton exchange membrane is then prepared through ball milling, granulation, pressing, and calcination. This membrane has low manufacturing cost, good proton transport efficiency, and extremely low internal resistance. When applied to microbial fuel cells, it can achieve higher output voltage and more stable power generation performance.

The invention discloses a method for reducing and detecting printing ink bubbles, and relates to the technical field of printing ink. The method comprises the steps of taking printing ink, designing a dispensing path, optimizing the dispensing amount and the dispensing speed, obtaining the dispensing amount through formula calculation, setting the dispensing speed and carrying out dispensing. Placing in a vacuum eutectic furnace, vacuumizing step by step to the ultimate vacuum degree, degassing, heating and curing to obtain a dispensing product; taking a dispensing product, adding the antioxidant solution, and recording the temperature T1 and the volume V3 of the dispensing product; and water culture is conducted, vacuumizing is conducted to reach the ultimate vacuum degree, and the temperature T2 and the volume V4 of the vacuumized dispensing product are recorded. According to an ideal gas formula, calculating the volume of bubbles in the printing ink and the dispensing product before and after vacuumizing by measuring the volume variation of the printing ink and the dispensing product in the graduated bottle and the separated graduated cup caused by bubble expansion under a vacuum condition; a spiral or Z-shaped path is adopted for dispensing, and air exhaust is facilitated through a continuous, one-way and non-closed dispensing path.

A biomimetic mother-of-pearl interlocking structure hydrophobic hemp fiber-based radiation cooling membrane and its preparation method are disclosed, belonging to the field of radiation cooling technology. To address the problems of environmentally unfriendly raw materials, high cost, complex preparation processes, and low cooling efficiency in existing radiation cooling materials, this invention provides a preparation technology for a hemp fiber-based biomimetic radiation cooling membrane and a flexible fabric coating. Using industrial hemp recycled fibers as the core green matrix, through synergistic design of material innovation, structural innovation, and process innovation, it comprehensively solves the technical defects of existing radiation cooling materials, providing a new green solution for the large-scale application of radiation cooling technology in multiple scenarios. This radiation cooling membrane, using recycled industrial hemp fibers as the matrix, combines the characteristics of being environmentally friendly, having a biomimetic interlocking structure, and providing high-efficiency radiation cooling. The preparation process is simple and can be mass-produced, meeting the application needs of multiple fields such as building energy conservation, outdoor equipment manufacturing, electronic equipment thermal management, and agricultural greenhouse film control.

The utility model discloses a sensor preprocessor assembly with heat insulation function, it includes sensor preprocessor body, fibre heat insulating spare and mounting piece, sensor preprocessor body is cylindrical structure, fibre heat insulating spare is fibre structure, and fibre heat insulating spare is around the outer surface of sensor preprocessor body, to form the cylindrical heat insulation sleeve for the heat insulation of sensor preprocessor body at the outer surface of sensor preprocessor body, and the inner diameter of cylindrical heat insulation sleeve is not less than the outer diameter of sensor preprocessor body, mounting piece is sleeved in the periphery of cylindrical heat insulation sleeve, and mounting piece is used for detachably mounting cylindrical heat insulation sleeve on support. The sensor preprocessor assembly with heat insulation function through setting fibre heat insulating spare outside sensor preprocessor body, when sensor preprocessor body is in high temperature environment, the conduction of isolated radiation, guarantees the detection accuracy of sensor preprocessor, and improves the service life of sensor preprocessor.

This invention provides a method for preparing and encapsulating solvent-resistant electronic paper microcups, belonging to the field of electronic paper display technology. Addressing the problems of uneven wall thickness and difficult demolding in existing electronic paper microcups, this invention aims to provide a solution. The method includes substrate pretreatment, microcup layer fabrication, template treatment, curing, demolding, oil phase filling, and sealing steps. Specifically, the template treatment uses perfluoroalkylchlorosilane for anti-sticking treatment, extending template life and enabling multiple uses; the microcup layer coating thickness is 20–100 μm to ensure uniform microcup wall thickness; the oil phase filling temperature is -25–40℃; and sealing uses a thin film with a thickness of 10–50 μm, which is effectively encapsulated through heat pressing and curing. This invention combines photopolymerization, nanoimprinting, and low-surface-area demolding technology to overcome the defects of uneven wall thickness and difficult demolding in existing technologies. The prepared microcup electronic paper exhibits good solvent resistance, high mechanical strength, and excellent encapsulation effect.

The utility model relates to an automatic pressure calibration device circuit of an electromagnetic water meter. The automatic pressure calibration device circuit comprises an MCU microcontroller, a peripheral module, two ADC modules, eight pressure sensor modules, a relay control module, a power supply module, a 485 communication module, a liquid crystal display module, a power supply color indicating lamp, a key module and a color indicating lamp. Eight pressure sensors are calibrated at the same time, efficiency is improved, and time is saved. Pressure calibration of the electromagnetic water meter is facilitated, production efficiency is improved, mechanical strength of worker operation is reduced, time of workers is saved, production cost is reduced, and benefits of enterprises are improved.

A cover window, a method of manufacturing the cover window, and an electronic device including the cover window are provided. The cover window includes: a first surface; a second surface facing the first surface; and a plurality of side surfaces between the first surface and the second surface. Each of the side surfaces has a radius of curvature of from about 15 R to about 25 R. A first side surface among the side surfaces includes a plurality of etched holes. A difference between a maximum height and a minimum height of the etched holes overlapping each other in a direction in which the first side surface extends is about 0.1 [mu] m to about 0.5 [mu] m.

This invention discloses a polishing slurry, its preparation method, and its application, relating to the field of polishing slurry technology. The polishing slurry of this invention comprises silica abrasive, citric acid, and sodium citrate, with a pH < 7. It effectively controls metal ion contamination during the polishing process of synthetic quartz, improves the removal rate during the polishing of quartz glass substrates, and reduces the surface roughness of the quartz. It synergistically optimizes chemical corrosion and mechanical removal, achieving an atomically smooth, scratch-free, and subsurface-damage-free quartz glass substrate surface while maintaining a high material removal rate. Furthermore, it possesses characteristics such as low contamination, easy cleaning, and environmental friendliness.

The application discloses a rotary kiln composite lining structure and belongs to the technical field of thermal equipment. The rotary kiln composite lining is designed by a structure of a working layer, a functional layer and an anchoring structure, integrates the concepts of mechanical reinforcement and energy-saving protection, and can realize good structural stability and heat insulation performance. Through efficient reflection of radiant heat by a reflection layer, cooperative heat conduction blocking of a heat preservation layer and a heat insulation layer, resistance to corrosion and stress buffering of a protection layer, and anti-abrasion and high-temperature corrosion resistance of the working layer, a hierarchical heat protection system is formed. In combination with a quasi-flexible connection system in the anchoring structure, the rotary kiln thermal expansion stress and shear stress in the rotating process can be reduced under the premise of ensuring the connection strength, and the overall stability of the structural layer is improved. The rotary kiln composite lining provided by the application has mechanical strength and heat insulation performance, can obtain a relatively long service life, and realizes efficient energy saving of the rotary kiln.

The invention discloses a two-component polyurethane corner-combining adhesive which is composed of a component A and a component B, the component A comprises the following raw materials: polyether polyol, modified polyol, a plasticizer, a filler, molecular sieve activation powder, fumed silica, a defoaming agent and a catalyst; the component B comprises the following raw materials: isocyanate, a plasticizer, a filler, fumed silica and a defoaming agent; the raw materials of the modified polyol comprise long carbon chain dibasic acid, aromatic diol, castor oil and a catalyst, and the modified polyol contains a long carbon chain, a benzene ring and an ester group. According to the scheme, the modified polyol which can resist high temperature and keep flexibility at low temperature is synthesized and is used for preparing the two-component polyurethane corner combining adhesive, so that the two-component polyurethane corner combining adhesive can still keep higher mechanical strength after circulation of cold and hot impact, and the mechanical strength is reduced by less than 10%, so that the defects in the prior art are overcome.

A polyamide resin composition comprising a polyamide resin and a phosphonate compound (C) in an amount of 10.0 parts by mass and 22.0 parts by mass relative to 100 parts by mass of the polyamide resin, wherein the polyamide resin comprises a polyamide resin (A) and a polyamide resin (B), wherein the polyamide resin (A) has a melting point of 280°C or higher as determined by differential scanning calorimetry (DSC) and an intrinsic viscosity [η] of 0.90 dl / g or higher as determined by differential scanning calorimetry (DSC), and the polyamide resin (B) has a heat of fusion of 0 J / g or higher and 5 J / g or less as determined by differential scanning calorimetry (DSC).

This application relates to the field of biomedical polymer materials technology, and discloses a variable-rigidity chest drainage tube based on a stimulus-responsive hydrogel and its preparation method. The variable-rigidity chest drainage tube comprises an interpenetrating network hydrogel, which includes: a chitin first network, prepared by phase inversion from a chitin solution with a mass percentage concentration of 1.5-4.0%; and a polyacrylamide second network, formed by polymerizing a second network precursor solution in the first network. The second network precursor solution comprises: 15-30% w / v acrylamide; 0.1-1.0% w / AAm N,N'-methylenebisacrylamide; and 0.5-2.0% w / AAm ammonium persulfate. This invention utilizes the reversible reconstruction mechanism of hydrogen bonds between the chitin and polyacrylamide networks to maintain high rigidity of the drainage tube before insertion and transform it into high flexibility after placement in body fluid, thus solving the patient discomfort and tissue damage risks caused by excessive rigidity of silicone tubes.

The application belongs to the technical field of high polymer materials, and discloses a flame-retardant hydrophobic copolymer nylon material, a preparation method and application thereof. A low steric hindrance short-chain perfluoroalkyl hydrophobic unit (modified with heptafluoro) and a DOPO flame-retardant unit are integrated in a single caprolactam monomer and embedded in a polymer main chain, so that a hydrophobic barrier is constructed to protect the flame-retardant structure from hydrolysis, a stable mechanism of synergistic enhancement of the two is constructed, and a technical bottleneck that the prior art cannot guarantee long-term safety and reliability of the material under high-humidity harsh environment at the same time is overcome.