3results about How to "Prevent crack propagation" patented technology

The invention relates to the technical field of hydrogel, and discloses a conductive hydrogel matrix preparation method and a flexible strain sensor, prepared methoxypolyethylene glycol modified chitosan, a multi-arm alkenyl betaine type cross-linking agent, acrylamide and the like are polymerized to obtain a conductive hydrogel matrix, and the conductive hydrogel matrix can be used for preparing the flexible strain sensor; the multi-arm alkenyl betaine type cross-linking agent contains six alkenyl structures and can form a compact three-dimensional cross-linked network structure, and physical winding of an internal network of the organic hydrogel and strong hydrogen bonds of the chitosan cooperate to form strong physical cross-linking interaction; dipole-dipole interaction in quaternary ammonium salt and sodium sulfonate zwitterions is beneficial to ion migration, free moving ions with the maximum concentration can be released, the ion migration rate and conductivity are improved, and sensitive transmission of signals is facilitated; the conductive hydrogel matrix can be tightly bonded with base materials such as rubber and tinplate, and the bonding strength is high.

The invention provides a cement-based composite material mixed with surface modified steel fiber and a preparation method thereof. The cement-based composite material is prepared from the following raw materials: 300 to 750 parts of cement, 60 to 100 parts of fly ash, 80 to 200 parts of silica fume, 40 to 100 parts of mineral powder, 300 to 600 parts of coarse aggregate, 400 to 800 parts of fine aggregate, 10 to 60 parts of zinc oxide whisker, 50 to 200 parts of modified steel fiber, 150 to 200 parts of tap water and 8 to 25 parts of water reducing agent. CaCO3 particles are introduced into the modified steel fibers through surface mineralization treatment, on one hand, a large number of fixed sites are provided, and on the other hand, the fibers are endowed with surface roughness, hydrophilicity and affinity with cement mortar, so that the interfacial compatibility and binding force between the steel fibers and a cement matrix are improved, and the gravity effect of the steel fibers is overcome; and meanwhile, the low-density zinc oxide whiskers replace part of steel fibers, so that the gravity effect is also reduced. In addition, the dense filling effect of the zinc oxide whiskers further improves the internal microstructure of the concrete, reduces the generation of gaps, and improves the compactness of the concrete. According to the invention, the reinforced and toughened cement-based composite material with uniformly dispersed fibers is obtained.

This invention discloses a cathode material and its preparation method, a cathode electrode sheet, and an all-solid-state lithium battery, belonging to the field of all-solid-state lithium battery technology. The cathode material includes a core and a composite coating layer covering the surface of the core. The core includes a ternary cathode material. The composite coating layer includes an inner coating layer, a middle coating layer, and an outer coating layer arranged sequentially from the inside out. The inner coating layer is a solid electrolyte, the middle coating layer is at least one of lithium niobate, lithium zirconate, and lithium tantalate, and the outer coating layer is lithium phosphate. Both the middle and outer coating layers are continuous films. Along the diameter direction of the core, the elastic modulus of the inner coating layer is greater than that of the middle coating layer, and the elastic modulus of the middle coating layer is greater than that of the outer coating layer.