7results about How to "Reduce penetration depth" patented technology

This invention relates to the field of refractory fiber materials, and more particularly to raw materials comprising, by weight: 30-60 parts magnesium aluminum spinel, 10-30 parts M70 sintered mullite, 5-30 parts silica micropowder, 1-20 parts starch ether, and 0.5-2.0 parts surface-modified reinforcing fiber and 5-20 parts ZrO2 micropowder; wherein the surface-modified reinforcing fiber is pre-oxidized polyacrylonitrile fiber, and its surface is bonded or coated with a layer of silicon-based polymer precursor, wherein the silicon-based polymer precursor is selected from polysiloxane or polycarbosilane. The high-temperature resistant ceramic fiber coating of this application has good thermal insulation performance, strong stability, and excellent resistance to chemical erosion and wind erosion.

The utility model relates to the field of agricultural mulching films, mainly aims to solve the problem that the existing PBAT agricultural mulching film is insufficient in ultraviolet shielding effect, and provides an anti-ultraviolet PBAT composite degradable agricultural mulching film which is characterized by comprising a front packaging layer 1 serving as an illuminated surface, an ultraviolet shielding layer 2 and a back packaging layer 3 serving as a soil contact surface which are sequentially stacked, the ultraviolet shielding layer 2 comprises a structural body formed by compounding PBAT and a nanoscale ultraviolet shielding material, the nanoscale ultraviolet shielding material is of a micro-nano composite structure formed by uniformly mixing a nano sheet layer and a micron sheet layer in the ultraviolet shielding layer 2, and the nanoscale ultraviolet shielding material is arranged in a PBAT matrix in an oriented mode to form a brick mud structure. The PBAT degradable composite mulching film can effectively ensure visible light transmission and excellent mechanical properties, can reduce aging and degradation of the mulching film caused by ultraviolet radiation, and can be expected to be used in the agricultural field, especially in the agricultural field especially needing anti-ultraviolet shielding.

The invention relates to the technical field of castable, in particular to high-performance tundish cover castable based on high-aluminum ceramic chip recycled aggregate and a preparation method of the high-performance tundish cover castable. The castable comprises high-aluminum ceramic chip recycled aggregate, modified hollow alumina microspheres, andalusite and other components, and through roasting stabilization treatment of the recycled aggregate and multi-layer coating modification of the microspheres, the problems of poor heat preservation property and concentrated thermal stress caused by high doping amount of the recycled aggregate are solved. The andalusite cooperates with the modified microbeads to optimize aggregate-andalusite-microbead three-phase interface combination by virtue of the low-expansion characteristic and the active surface, so that the thermal shock resistance and the structural compactness are enhanced. The product has excellent heat preservation and heat insulation performance, high strength and slag corrosion resistance, resource efficient utilization of waste high-aluminum ceramic chips is achieved, and the service life of the tundish cover is prolonged.

This invention discloses a layered concrete structure with anti-penetration and filtering properties and its preparation method. It solves the problem in existing technologies where only the composition of the concrete layers is changed without improving the overall filtering performance. This invention has the beneficial effects of improving filtering performance and preventing further crack development. The specific solution is as follows: A layered concrete structure with anti-penetration and filtering properties includes a fiber-reinforced concrete layer and an intermediate composite material layer. The intermediate composite material layer is placed between two fiber-reinforced concrete layers. The fiber-reinforced concrete layer and the intermediate composite material layer are periodically arranged to form a layered concrete structure to enhance the filtering performance and improve the anti-penetration performance. The fiber-reinforced concrete layer contains steel fiber reinforcement to enhance the anti-penetration performance of the layered concrete structure. The wave transmittance in the intermediate composite material layer is different from that in the fiber-reinforced concrete layer, and the intermediate composite material layer is bonded to the fiber-reinforced concrete layer.

The invention provides an elastic layer material for preventing micro-leakage after dental caries repair as well as a preparation method and application of the elastic layer material, and belongs to the technical field of oral medical materials. The elastic layer material comprises the following raw materials: a main component, an auxiliary component, a diluent, a mixed filler and a photoinitiator, the main component is a polyurethane elastomer prepolymer; and the auxiliary component is a hyperbranched polyester acrylate prepolymer. The main component polyurethane elastomer prepolymer forms a framework of an elastic layer material to ensure that the elastic layer material has certain elasticity, and the terminal group of the introduced auxiliary component hyperbranched polyester acrylate prepolymer is efficiently crosslinked with polyurethane, so that the elastic layer has a stable three-dimensional network structure, and the penetration depth of dye can be remarkably reduced.

The invention discloses a method for inhibiting rust of rusted steel bars in a concrete structure, and aims to solve the problems that in the prior art, a safe, environment-friendly and long-acting steel bar corrosion inhibitor convenient to construct is lacked, and a long-acting steel bar corrosion prevention method formed by compounding materials such as an efficient anti-corrosion coating is lacked. Through three innovations of organic silicon modification, a nano-composite technology and a self-crosslinking system, the core problems of poor weather resistance, high VOC (Volatile Organic Compounds), insufficient dispersion stability and the like of the traditional acrylic emulsion are solved, and the acrylic emulsion is particularly suitable for severe environments with high ultraviolet rays, high humidity and the like, so that long-period corrosion prevention is realized, and the service performance of concrete is improved.

The utility model relates to the field of agricultural mulching films, and provides an anti-ultraviolet polylactic acid composite degradable agricultural mulching film mainly aiming at the problem of insufficient ultraviolet shielding effect of the existing polylactic acid-based agricultural mulching film, which is characterized by comprising a front packaging layer 1, an ultraviolet shielding layer 2 and a back packaging layer 3 which are sequentially stacked, the ultraviolet shielding layer 2 comprises a structural body formed by compounding polylactic acid and a nanoscale ultraviolet shielding material, and the nanoscale ultraviolet shielding material is of a micro-nano composite structure formed by uniformly mixing a nano sheet layer and a micron sheet layer in the ultraviolet shielding layer 2 and is arranged in a polylactic acid matrix in an oriented manner to form a brick mud structure. The mulching film can effectively reduce aging and degradation of the mulching film caused by ultraviolet radiation, can be effectively used for protecting root systems of crops from being damaged by the ultraviolet radiation, and can be expected to be used in the agricultural field, especially in the agricultural field particularly needing anti-ultraviolet shielding.