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2219results about How to "Prevent subsidence" patented technology

A preparation method of a ceramic coated separator for lithium ion batteries

The invention discloses a preparation method of a ceramic coating separator for lithium ion batteries and belongs to the technical field of lithium ion battery separator production. The method involves a polymer porous base film, a polymer glue applied on one or both sides of the base film surface, a ceramic coating applied on the surface of the polymer glue, and a PVDF and its copolymer glue applied on the other side of the ceramic coating surface and the base film surface, wherein the PVDF and its copolymer glue are coated on the other side of the ceramic coating surface and the base film surface. The inorganic ceramic particles adopted by the invention are non-spherical and multi-particle, which can greatly improve the porosity of the ceramic coating, increase the lithium ion transit property, improve the liquid absorption rate of the diaphragm, and improve the rate performance and cycle life of the lithium ion battery. As the structure design of the ceramic coat diaphragm of the invention can increase the adhesive force of the ceramic coating and the polymer porous base membrane, the adhesive strength of the diaphragm and the positive and negative electrode sheets is improved,the problems of powder dropping and coating peeling off are effectively improved, the high-efficient automatic assembly of the lithium battery is realized, and the heat resistance and electrochemicalstability of the diaphragm are greatly improved.
Owner:HENAN FUSEN NEW ENERGY TECH

Viscose containing natural antimicrobials and preparation method thereof

The invention provides viscose containing natural antimicrobials. The viscose containing the natural antimicrobials comprises the viscose and the antimicrobials contained in the viscose. The viscose containing the natural antimicrobials is characterized in that the antimicrobials is natural indigowoad leaf extract powder, a natural indigowoad leaf extract powder solution added with dispersing agent is added into a viscose filature stock solution, the additive amount of the natural indigowoad leaf extract powder is 1%-7% of the quality of the viscose filature stock solution, the additive amount of the dispersing agent in the natural indigowoad leaf extract powder solution is 0.1%-1.0% of the quality of water in the natural indigowoad leaf extract powder solution. The preparation method of the viscose comprises the steps of dissolving the indigowoad leaf extract powder into water and adding the dispersing agent to obtain the indigowoad leaf extract powder solution, adding the indigowoad leaf extract powder solution to the viscose filature stock solution according to a ratio of 10%-14% of the quality of the viscose filature stock solution, and then shaping a obtained solution according to conventional wet spinning jet process to obtain the viscose. The viscose has a durable antibacterial function and has no side effect on human bodies. The preparation method has reasonable and simple technology, and is suitable for industrialized production.
Owner:单修铎

In-situ preparation method of water-based lubricant containing molybdenum disulfide nanosheet

An in-situ preparation method of a water-based lubricant containing a molybdenum disulfide nanosheet comprises six steps as follows: (1), a surface active agent is dissolved in deionized water in a proportion to obtain a solution; (2), molybdenum disulfide powder is uniformly dispersed into the solution; (3), a molybdenum disulfide dispersion liquid is subjected to ultrasonic cavitation processing; (4), the solution is left to stand for a certain period of time, and a supernatant liquid of the solution is taken; (5), the obtained solution is subjected to centrifugal separation processing; (6) the supernatant liquid of the centrifugal solution is collected, and the water-based lubricant containing the in-situ prepared molybdenum disulfide nanosheet is obtained. The method is easy, convenient and feasible, and the dispersion stability of the molybdenum disulfide nanosheet is good. A friction experiment result indicates that the wear-resistant and anti-friction performance of the lubricant can be greatly improved by adding a small quantity of the molybdenum disulfide nanosheet on the premise that the original excellent characteristics of good cooling performance and processability and the like of the water-based lubricant are not influenced, and the addition quantity of the molybdenum disulfide nanosheet ranges from 0.001% to 1%.
Owner:BEIHANG UNIV

Constructing method for shield entering into hole while passing through pipeline

The invention relates to a constructing method for a shield entering into a hole while passing through a pipeline. The constructing method comprises the following steps: (1) reinforcing an end shaft three-axe agitating pile entering into the hole and a rotary spraying pile, increasing a reinforcing area to 9 meters and keeping a reinforcing depth as 3 meters under a tunnel; (2) arranging a row of isolating piles between a sewage pipe and a station end shaft, isolating a lateral soil pressure of a soil body under the sewage pipe, and preventing pipeline settlement caused by a released soil pressure stress, wherein the isolating piles are three-axe agitating piles; (3) arranging four dewatering wells in a scope of entering the hole, dewatering and reducing a water level to 1 meter under a hole door; (4) except mounting a waterproof device around the hole door, mounting a double-layer spring steel plate, and filling sponge in the middle; (5) finishing an operation of chiseling the hole door within the shortest time; (6) adjusting all parameters, causing the shield to safely and quickly enter into the hole while passing through the pipeline; and (7) cleaning soil and turning a shielding machine. The constructing method provided by the invention has the advantages that the shielding machine successfully enters into the hole while passing through the pipeline, a successful construction case of a high-risk construction process of entering the hole of the shield under a complex condition is achieved, and abundant construction experiences for silt construction and close-range pipeline passing of the shield are provided.
Owner:SHANGHAI MECHANIZED CONSTR GRP

Method for preparing graphene water-based lubricating agent in situ

The invention discloses a method for preparing a graphene water-based lubricating agent in situ, belonging to the field of application of graphene serving as a nanometer lubricating additive. The lubricating agent consists of graphene nanoparticles, a surface modifier and purified water. The method comprises the following preparation steps: 1, dissolving a surfactant in deionized water according to a ratio, thereby obtaining a liquid; 2, uniformly dispersing graphene powder in the liquid; 3, performing ultrasonic cavitation treatment on the graphene dispersion liquid; 4, standing the liquid for a certain time, and taking the upper liquid; 5, performing centrifugal separation treatment on the obtained liquid; and 6, collecting the supernatant of the centrifuged liquid, thereby obtaining the water-based lubricating agent containing graphene prepared in situ. The method disclosed by the invention is simple in feasible, and the dispersion stability of the graphene is high. The friction test result proves that according to the extremely small addition amount (0.001-1 percent) of the graphene, the anti-wear and friction reduction properties of the lubricating agent can be greatly improved, and excellent characteristics such as good inherent cooling property, high machinability and environment friendliness of the water-based lubricating agent are not influenced.
Owner:BEIHANG UNIV
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