8results about How to "Good mechanical properties" patented technology

The application discloses a spray forming cold-rolled work roll blank and a preparation method thereof. By designing material components, the toughness of the base body is increased to meet the rolling requirement of ultra-high strength steel. Meanwhile, the spray forming technology is adopted, so that the prepared spray forming cold-rolled work roll blank has comprehensive improvement in normal temperature and high temperature mechanical properties, especially the high temperature toughness, wear resistance and heat crack resistance are greatly improved, so as to solve the peeling, uneven carbide and relatively insufficient wear resistance of the high-speed steel work roll prepared by ESR smelting and forging technology.

The application discloses a method for improving notch sensitivity of a GH2909 alloy forge piece and the GH2909 alloy forge piece, and comprises the following steps: S1, selecting a rod-shaped blank to be heated for the first time and kept warm; S2, heating the rod-shaped blank in S1 for the second time and keeping warm; S3, placing the rod-shaped blank in S2, which reaches the keeping-warm time, into a forging equipment to be forged into a shape; S4, rapidly cooling the forge piece obtained in S3; S5, performing surface defect treatment on the cooled forge piece; and S6, performing aging heat treatment on the forge piece after the surface defect treatment. The GH2909 forge piece produced by the method has no persistent notch sensitivity problem, and a forge piece with qualified structure and mechanical properties can be obtained.

The application discloses a kind of encapsulation glue selection methods and encapsulation structure for crystal screen film, and the selection method is established by the multi-dimensional performance index system with adhesion strength, light transmittance, weather resistance, yellowing index and modulus as core, and finally the encapsulation glue selection is completed by threshold preliminary screening, interface compatibility accelerated aging test, encapsulation interface stress simulation analysis through weighted quantitative comprehensive score;The encapsulation glue prepared by the selection method is used in the encapsulation structure of crystal screen film, including the layer-by-layer lamination of crystal screen film layer, encapsulation glue layer and cover layer.The application realizes the systematization and quantifiable selection of encapsulation glue for crystal screen film, solves the pain points of insufficient long-term reliability, interface failure and optical performance degradation caused by the experience selection of prior art, and can significantly improve the structural stability and service life of crystal screen film product, and is suitable for the encapsulation scene of crystal screen film of various high-end display devices.

The present invention relates to a food packaging material, to a method for producing a food packaging material and to the use thereof. The food packaging material of the present invention comprises (i) a paper substrate having a first side and a second side, the second side being opposite the first side wherein the paper substrate is impregnated with a composition comprising a grease barrier precursor, and (ii) a barrier layer coated onto at least the first side of the impregnated paper substrate, the barrier layer comprises a polymer wherein the total amount of perfluoroalkyl species and polyfluoroalkyl species in the packaging material does not exceed 20 ppm based on the total weight of the packaging material.

This invention discloses a novel reverse transcriptase and its applications. The amino acid sequence of the reverse transcriptase is selected from any of the amino acid sequences shown in SEQ ID NO: 1 to SEQ ID NO: 19, or, obtained by mutating one or more amino acids of any of the above sequences, resulting in an amino acid sequence with at least 85%, 90%, or 95% identity to the original sequence and possessing reverse transcription activity. The genome-guided editing system containing the reverse transcriptase of this invention further includes a nucleic acid-programmable DNA-binding protein and pegRNA. Both the reverse transcriptase and the genome-guided editing system containing it can be used to target and modify the plant cell genome or to cultivate plants with genome modifications. This invention effectively overcomes the dependence of existing guided editing systems on single-structure chassis enzymes, thereby providing a rich reserve of underlying components for crop molecular design breeding.

The utility model relates to the technical field of orthopedic tools, and discloses a posture correcting belt which comprises a waist belt and shoulder belts, the two shoulder belts are arranged in a bilateral symmetry mode and are arranged on the back of a human body in a crossed mode, the front ends of the shoulder belts are connected with the waist belt through the chest of the human body and at a first connecting point X at the junction of the anterior saw muscle of the human body and the pectoralis major muscle of the human body, and the back ends of the shoulder belts are connected with the waist belt. The rear ends of the shoulder straps pass through the shoulders of the human body and obliquely pass through a second connecting point Z at the position of latissimus dorsi of the back of the human body to be adjustably connected with the waistband. According to the posture correcting belt, by optimizing the connecting point positions and mechanical distribution of the shoulder belts and the waist belt, the comfort degree and the correcting effect of the posture correcting belt are remarkably improved, the posture correcting belt can provide stable supporting and correcting force while dispersing pressure and optimizing stress distribution through the design of the crossed shoulder belts and reasonable mechanical fulcrum distribution, and therefore the poor posture is effectively improved, and the posture correcting effect is improved. And the discomfort of the body is reduced.

The invention discloses a novel method for crystallizing thiamine nitrate, which comprises the following steps of: adding ammonium nitrate prepared by mixing industrial-grade stronger ammonia water and concentrated nitric acid according to the volume ratio of 1: 1 into 15-20 percent by mass of thiamine thiooxide liquid, and regulating the temperature to 15-45 DEG C; and adjusting the pH value with ammonia water not higher than 25%, adding a seed crystal when the pH value is 4.0-5.0 until the final pH value is 5-8, stirring and crystallizing for 0.5-2 hours at the speed of 100-600r / min, and then filtering and drying. Preferably, the concentration of ammonia water is 5%, the temperature is 15-35 DEG C, and the rotating speed is 300-400 r According to the method, parameters are accurately regulated and controlled, the length-diameter ratio of thiamine nitrate is reduced to 1.8-2.1, the yield is increased to 93-95% from 87%, the flowability is greatly optimized, the problems that existing products are fine in grain and prone to electrostatic adsorption are solved, the process is simple, the cost is low, and the method is suitable for industrial production.

This invention describes a modified silicate-polyurethane two-component grouting reinforcement material, comprising component A and component B, which are mixed in a 1:1 volume ratio before use. Component A, by mass percentage, consists of the following components: water glass: 94%; glycerol: 1%; glyceryl ester compounds: 1%; silane coupling agent: 1%; water: 3%. Component B, by mass percentage, consists of the following components: polymethylene polyphenyl polyisocyanate PM-200: 65%; dibutyl phthalate (DBP): 35%. This invention utilizes the synergistic effect of glyceryl ester compounds and silane coupling agents. The glyceryl ester compounds reduce the interfacial tension between the aqueous and oil phases and promote the uniform dispersion of the silane coupling agent. The silane coupling agent forms a chemical bridge between the inorganic and organic phases, enabling the originally incompatible aqueous and oily agents to form a homogeneous and compatible system. The resulting solidified body has a compressive strength of 24.6 MPa and a bond strength of 3.8 MPa, making it suitable for seepage prevention and sealing in underground engineering and for surrounding rock reinforcement.