40results about How to "Reduced low temperature performance" patented technology

The invention discloses a casting method of a low temperature resistant iron cushion plate for a high speed railway buckling part. The method comprises smelting, spheroidizing inoculation and casting, a smelting material is made of cast iron and low-carbon steel which meets requirements that P: <=0.04% and S: <=0.03%, smelted iron water is subjected to nodulizing and inoculation and then is subjected to casting molding, and hot processing is conducted to obtain the required iron cushion plate. According to the casting method, the quantity of ferrites can be increased, the low-temperature toughness is improved, and the anti-impact performance of the iron cushion plate can be improved further.

The invention provides ternary high-nickel electrolyte and a high-nickel anode lithium ion battery containing the electrolyte. The ternary high-nickel electrolyte is characterized by comprising, by weight, 13-15% of lithium salt, 80-85% of a non-aqueous organic solvent and 0.1-5% of an additive; wherein the additive comprises vinylene sulfate, vinylene carbonate, succinonitrile, tris (trimethyl silicon-based) phosphorus, lithium bifluroflavin imide and lithium dioxalate borate; the lithium salt is lithium hexafluorophosphate; the non-aqueous organic solvent comprises a cyclic carbonate compound, dimethyl carbonate and ethoxy pentafluoro tripolyphosphate; the high-nickel anode lithium ion battery containing the ternary high-nickel electrolyte adopts anode slurry prepared from high-nickel ternary anode powder, a conductive agent, a functional composite binder, a solvent N-methyl pyrrolidone to prepare the anode membrane, the high-nickel anode lithium ion battery has excellent normal-temperature cycle performance, high-temperature cycle performance and high-temperature storage service life, and can obviously reduce the gas yield in the high-temperature storage process.

The invention discloses an aggregate for lowering pavement temperature and a method for preparing a bitumen mixture by utilizing the same, which relates to an aggregate and a method for preparing a bitumen mixture by utilizing the aggregate, and solves the problems that the existing stone serving as the aggregate for paving a highway wearing layer has large thermal coefficient and high cost. The aggregate for lowering the pavement temperature of the invention is wasted ceramic particles with the grain diameter of 4.75mm-9.5mm. The method for preparing the bitumen mixture by utilizing the aggregate comprises the following steps: 1), computing needed stones with various grain diameters according to the grading mode of the wearing layer; 2), utilizing the aggregate to substitute for 18%-22% of the volume of the stone with the grain diameter of 4.75mm-9.5mm, weighting, and evenly mixing; and 3), preparing the mixed aggregate, mineral powder, slaked lime and bitumen into the bitumen mixture by the conventional method. The invention has low cost, and the thermal coefficient of the prepared wearing layer is 0.680W/m.DEG C-0.690W/m.DEG C, thus track diseases and the urban heat land effect are reduced, and the aggregate can be used for paving highways.

The invention relates to a fluororubber compound with low-temperature flexibility and high wear resistance, and a preparation method thereof, wherein the preparation raw materials of the compound comprise a main material and an auxiliary material, wherein the main material comprises a fluororubber modified low-temperature raw rubber, a fluororubber raw rubber and graphene master batch, the auxiliary agent is modified polyphenyl ester tetrafluoro powder, the fluororubber modified low-temperature raw rubber is a low-temperature raw rubber with a vulcanization point monomer, the modified polyphenyl ester tetrafluoro powder is obtained by modifying polyphenyl ester and tetrafluoro micro-powder in the presence of a silane coupling agent, and the graphene master batch is a graphene master batchtaking a ternary raw rubber as a basic raw rubber. According to the invention, the fluororubber compound rubber prepared by mixing and adding the modified raw rubber and the novel auxiliary agent according to a certain ratio through the special mixing method and the vulcanization process, so the low-temperature performance of the rubber material is improved, the wear resistance and the mechanicalproperty of the rubber material at a low temperature are improved, and the fluororubber compound rubber can be used as a low-temperature sealing material and can replace foreign products.

The invention relates to a lubricating agent of a sulfur dioxide compressor. The lubricating agent is prepared by compounding oil-soluble polyether and low-viscosity poly alpha-olefin to be base oil and mixing with various additives. The lubricating agent effectively alleviates the dilution degree on oil products caused by sulfur dioxide and avoids frictional wear due to insufficient oil film thickness caused by ultralow viscosity of the oil products, has excellent sediment controllability, does not generate carbon deposit and oil sludge, increases safety coefficient, has excellent viscosity-temperature property, low-temperature property, volatility, cooling property, high anti-shearing stability, hydrolytic stability and thermal oxidation stability, can reduce the friction coefficient of the surface of metal, and can meet the using requirement of the sulfur dioxide compressor under the harsh working condition.

The invention belongs to the technical field of sodium ion batteries, and particularly relates to a sodium ion battery electrolyte additive, an electrolyte and a sodium ion battery. The additive a comprises at least one of compounds shown in a formula I and a formula II; in the formula I and the formula II, R1-R15 are independently selected from one of H, halogen atoms, alkane groups, unsaturated alkyl groups, alkoxy groups and alkanoyl groups respectively; H in the alkane group, the unsaturated alkyl group, the alkoxy group and the alkanoyl group can be partially or completely substituted by one or more of halogen atoms, cyano groups, carboxyl groups and sulfonic acid groups; the additive b is one or more of ethylene carbonate, fluoroethylene carbonate, vinylethylene carbonate, ethylene sulfate and allyl sultone. The electrolyte additive can form a stable and compact interface film on the surfaces of a positive electrode and a negative electrode, reduces side reaction with an electrolyte, reduces gas generation, and enables the cycle performance and the high-temperature performance of a battery to be better.

The invention relates to a methanol fuel additive for cold plateau region. The additive is prepped by adding 3-20 wt.% of an oxidant hydrogen peroxide with mass concentration of 30%, 1-6% of an antifreeze, 0.2-3% of an antioxidant antigum agent 2,6-butylated hydroxytoluene, 0.05-0.6% of a metal passivator N,N-bis(salicylidene)-1,2-propanediamine, 0.008-0.06% of a detergent dispersant, 1-6% of a preservative and 1-20% of a emulsifier into 10-83.742% of aqueous solution, mixing evenly by pump circulation, then successively adding 3-20% of naphtha, 3-10% of toluene, 2-10% of xylene, 2-10% of C5H12-C7H16 in weight ratio of 1:1, and mixing homogeneously by pump circulation. At the same time, the invention also discloses a ratio and a preparation method of a methanol fuel containing the methanol fuel additive for cold plateau region. The methanol fuel additive for cold plateau region provided by the invention has good and stable performance, and solves the problems of low temperature fluidity, high altitude hypoxia burning property, low sulfur, low nitrogen and dynamic stability.

The invention discloses a low-temperature-resistant sponge sealing strip and a preparation method thereof. The defects that in the prior art, EPDM rubber is hardened in sealing and weakened in rebound resilience in alpine regions are overcome. The low-temperature-resistant sponge sealing strip comprises the following raw materials in parts by weight: 70 to 80 parts of EPDM, 20 to 40 parts of butadiene rubber, 5 to 15 parts of resin, 5 to 15 parts of a low-temperature-resistant aid, 80 to 115 parts of carbon black, 10 to 30 parts of a filler, 50 to 70 parts of paraffin oil, 0.8 to 1.2 parts of a vulcanizing agent, 2.5 to 3.5 parts of a vulcanization accelerator, 0.2 to 0.5 part of a scorch retarder, 2 to 5 parts of a foaming agent and 3 to 6 parts of a moisture absorbent. By compounding the resin, the butadiene rubber, the low-temperature-resistant aid and the EPDM, the cold resistance, the low-temperature resilience and the like of the product can be effectively improved.

The invention discloses a low-temperature lithium iron phosphate lithium ion power battery and a low-temperature discharging method, and belongs to the technical field of batteries. The low-temperature lithium iron phosphate lithium ion power battery comprises a positive plate, a negative plate, a diaphragm, an electrolyte and a battery shell column. A positive material in the positive plate consists of a positive active material, a binder, a conductive agent and a positive current collector, the positive active material adopts a carbon-coated lithium iron phosphate material, and the thickness of a nano carbon layer in the carbon-coated lithium iron phosphate is 2-5nm. Polyvinylidene fluoride is adopted as the binder, one or more of conductive carbon black, conductive graphite, crystalline flake graphite and carbon nanotubes are adopted as the conductive agent, and aluminum foil is adopted as the current collector. According to the invention, through chelating of bis-1, 6-hexylidene triamine penta (methylene phosphonic acid) and Fe<2+> ions, a carbon layer is formed in situ, so that the growth activation energy of lithium phosphonate crystal grains can be remarkably reduced, a single crystal carbon-coated lithium phosphonate composite material is obtained, and the electrochemical performance of a battery in a low-temperature environment is improved.

The invention discloses a preparation method of artificial graphite and a lithium ion battery. The preparation method of the artificial graphite comprises the following steps: S10, carrying out graphitization treatment on raw material coke powder to obtain an intermediate; s20, uniformly mixing a second raw material with the intermediate to obtain a composite precursor; amd s30, carrying out carbonization treatment on the composite precursor at 900-1400 DEG C under the protection of protective gas to obtain artificial graphite; wherein the second raw material comprises a liquid-phase coating agent. Through liquid phase coating, the surface morphology of the artificial graphite can be effectively improved, the specific surface area is reduced, active sites of side reactions are reduced, gas production of the lithium ion battery is reduced, volume expansion is reduced, and the safety performance of the lithium ion battery is improved; in addition, graphitization treatment is performed firstly and then coating is performed, so that the prepared artificial graphite has relatively good liquid absorption performance, the internal resistance is reduced, the low-temperature performance is improved, the reduction of the internal resistance is beneficial to the movement of lithium ions, and the prepared lithium ion battery has relatively good fast charging performance.

The invention discloses a hydrocracking method. The method comprises the following steps: (1) high-nitrogen raw oil and hydrogen are mixed and enter a hydrogenation pretreatment reaction zone for reaction; (2) carrying out heat exchange on the reaction effluent in the step (1) or a liquid phase separated from the reaction flow in the step (1), and then, carrying out reaction in a hydrofining reaction zone; (3) effluent of the hydrofining reaction zone in the step (2) enters a hydrocracking reaction zone for hydrocracking reaction, the outlet temperature of the hydrofining reaction zone is T1, the inlet temperature of the hydrocracking reaction zone is T2, T1-T2 = T, and T is controlled to be greater than 5 DEG C; and (4) treating the reaction effluent in the step (3) through a separator to obtain different products. The method can be used for directly processing the full-fraction shale oil, and can run for a long period to produce high-quality diesel oil and gasoline by adopting a once-through process flow.

The invention discloses a block copolymer, a composition and a preparation method thereof, a vulcanized rubber and applications thereof, a tread rubber and a tire. According to the invention, the block copolymer contains an LCBR block, an SSBR1 block and an SSBR2 block, wherein the content of vinyl in the LCBR block is low, the content of vinyl and the content of styrene in the SSBR1 block are moderate, and the content of vinyl and the content of styrene in the SSBR2 block are high; the block copolymer further comprises a connecting unit derived from a compound represented by a formula I, wherein part of the SSBR1 block is connected with the LCBR block through the connecting unit, the rest SSBR1 block is directly connected with the LCBR block, and at least part of the SSBR2 block is directly connected with the SSBR1 block; the copolymer rubber can obtain favorable wet skid resistance, obviously lowers the rolling resistance, has favorable comprehensive physical and mechanical properties, and is especially suitable to be used as tread rubber of tires; and the formula I is CH2=CH-R1-CH=CH2.