5results about How to "Less heat release" patented technology

The present application relates to a current measuring device and a current measuring assembly. When it is necessary to measure the magnitude of the current flowing through certain circuits on a circuit board, the opening of the conductive housing can be snapped onto the surface of the circuit board, and the conductive housing is in electrical contact with the circuit board. When the circuit or component that needs to measure the current is energized to generate current, the current will flow to the conductive column through the conductive housing, and then flow out through the conductive column to form a loop. The current first flows from the edge of the opening to the bottom. Since the conductive column is electrically connected to the bottom and the conductive column extends toward the direction of the opening, the current flows along the extension direction of the conductive column toward the direction where the opening is located. The flow direction of the current in the conductive housing is opposite to the flow direction in the conductive column. Therefore, parasitic parameters such as parasitic inductance can be eliminated to avoid the influence on the dynamic response of the test. Since the cross-sectional area of ​​the conductive housing is larger than that of the wire, the resistance to the current is smaller, which improves the safety performance.

The invention belongs to the technical field of thermotropic liquid crystal polyester synthesis, and particularly relates to a temperature control method of a thermotropic liquid crystal polyester synthesis reaction kettle and a reaction device. According to the invention, heating is stopped when the acylation reaction of the thermotropic liquid crystal polyester reaches the preset temperature, and the material liquid is boiled at a proper temperature and the temperature is constant in combination with air exhaust of the reaction kettle; and when the heat release is slowed down at the later stage of the reaction and the temperature is reduced by material liquid evaporation, the temperature balance is kept by utilizing moderate heating and reducing condensation reflux of byproducts, and the influence of temperature runaway on the product quality is reduced. According to the synthetic reaction device disclosed by the invention, through linkage control of the feed liquid temperature sensor and the gas phase temperature sensor in the reaction kettle and the vacuum regulating valve, the effects of regulating air pressure by temperature and controlling the temperature by air pressure are realized. Therefore, the temperature runaway of the acylation reaction of the thermotropic liquid crystal polyester is reduced by utilizing the boiling state of the feed liquid in the reaction kettle, the boiling mixing of the materials in the feed liquid is improved, and the reaction efficiency and the material utilization rate are improved.

The present invention provides a method for producing lithium difluorophosphate, wherein the method allows a difluorophosphate ester to react with a lithium salt compound in a non-aqueous organic solvent, wherein water is not used as a raw material in the reaction; the present invention also provides a method for producing difluorophosphate ester, which has a step of allowing a dihalogenated phosphate ester to react with a fluorinating agent containing a hydrofluoric acid concentration of less than 15 mol% in a non-aqueous organic solvent; the present invention also provides lithium difluorophosphate, wherein the value of the relationship (d90-d10) / MV represented by the particle size d90 of the volume cumulative distribution of 90%, the particle size d10 of the volume cumulative distribution of 10% and the volume average particle size MV is less than 10; the present invention also provides a method for producing a non-aqueous electrolyte using the above-mentioned production method and a method for producing a non-aqueous secondary battery.

The invention discloses gum barrier protection resin and a preparation method thereof. The resin is prepared from 40 to 70 parts of matrix resin, 20 to 40 parts of diluent resin, 5 to 20 parts of inorganic filler, 5 to 20 parts of ointment matrix, 0.1 to 0.5 part of initiator, 1 to 5 parts of auxiliary initiator and 0.1 to 1 part of polymerization inhibitor. The resin has the characteristics of low heat release and moderate curing speed, can prevent heat generated by curing from burning gingival soft tissues, has higher thixotropy, can be tightly attached to gingiva, can reliably isolate corrosive bleaching agents such as peroxide and the like, and can be used for preparing gingival soft tissues. Adverse reactions such as gingival causalgia and itching caused by solidification heat production and chemical irritant leakage are effectively reduced, and the gel is easy to smear, good in flexibility after solidification and easy to peel off integrally.

This invention provides a method for manufacturing a high-safety carbon material, comprising: step (A), mixing carbon material, coating material, glutaraldehyde, and a solution at a weight ratio of 100:2-6:0.2-0.6:100-300 to form a mixed slurry, wherein the carbon material is soft carbon and / or artificial graphite, and the coating material is chitosan and / or sulfurized chitosan; step (B), stirring the mixed slurry evenly and heating it at 70°C-90°C to form a evaporated slurry; step (C), heating the evaporated slurry at 70°C-90°C for more than 24 hours, and then cooling it to room temperature to form a high-safety carbon material. The method of this invention helps to obtain a high-safety carbon material that can mitigate the large amount of heat released during the decomposition of the solid electrolyte interfacial film, prevent the heat generated by the decomposition of the solid electrolyte interfacial film from triggering the entire thermal runaway mechanism, and improve the safety of the negative electrode material in battery use.