38results about How to "Reduce decomposition reactions" patented technology

It relates to a method and device of changing solar energy to chemical energy. It accumulates the solar energy and changing it to heat energy ranging from 150deg.C-300deg.C, providing reaction heat for the liquid fuels, allowing the middle and low level solar energy changing and stored into high level chemical energy, with the liquid being carbinol or dimethyl ether synthetic fuel, with the catabolite being hydrogen and monoxide formed gas. It can be used for multi purposes, providing fine synthetic fuel and material for customers.

The invention discloses a high-nickel single-crystal ternary cathode material with low surface residual alkali content and a preparation method thereof. The preparation method comprises the followingsteps: weighing lithium hydroxide, an oxide additive and a nickel-cobalt-manganese ternary precursor, and carrying out uniform mixing through a dry high-speed mixing process so as to prepare a mixed material; subjecting the mixed material to first sintering so as to obtain a first sintered material; crushing the first sintered material, and carrying out sieving so as to obtain a first crushed material; weighing the first crushed material, a coating agent and deionized water, and carrying out water washing under stirring so as to prepare a slurry, wherein the coating agent comprises an elementX which is one or more selected from the group consisting of B, Al, Ba, Zr, Mg, Ca, Ti, Si, V, Sc, Nb, Ta and Z; drying the slurry under a vacuum condition through a dynamic rotary drying process so as to obtain a dry material; subjecting the dry material to secondary sintering so as to obtain a secondary sintered material; and crushing the secondary sintered material, and carrying out sieving soas to obtain a product. The high-nickel single-crystal ternary cathode material and the preparation method thereof provided by the invention has the following advantages: alkali reduction by water washing and in-situ coating by a wet process can be synchronously completed; the process is simple; high compaction density is realized; and the content of residual alkali is low.

The invention discloses an inorganic/organic composite functional porous isolating membrane. The isolating membrane comprises porous base material and at least one inorganic functional coating adhering to the surface of the porous base material, and aqueous slurry prepared for the inorganic functional coatings is prepared from inorganic ceramic particles, water-soluble polymer thickener and aqueous polymer adhesive; the inorganic ceramic particles comprise the same substance in two types of particle sizes, wherein the average particle size (D50) of the smaller inorganic ceramic particles is 0.2-0.5 micrometer, and the average particle size (D50) of the larger inorganic ceramic particles is 0.6-1.0 micrometer; the aqueous polymer adhesive is a hydrophobic high-molecular polymer with the water drop contact angle of the dry adhesive of the aqueous polymer adhesive 110-140 degrees; the solid content of the aqueous slurry is 40-60%. According to the inorganic/organic composite functional porous isolating membrane, the high-temperature thermal stability of the isolating membrane can be effectively improved by means of the inorganic functional coatings, and the water content of the inorganic coatings is effectively reduced, so that the safe performance of a battery and the stability of long-term circulation are improved.

The invention discloses a light-weight fiber-reinforced phenolic sandwich plate and a preparation method thereof. The light-weight fiber-reinforced phenolic sandwich plate is composed of two surface layers and a core material layer between the two surface layers or is composed of two sandwich surface layers and a core material layer between the two sandwich surface layers, and the core material layer is a fiber-reinforced phenolic light-weight foam layer. The plate disclosed by the invention solves the problem of brittleness of phenolic foam, and the plate is composed of phenolic materials with better flame resistance from inside to outside, so that the flame resistance of the plate is excellent, the plate can resist to high temperature of 150-180 DEG C, the plate strength retention ratio at high temperature is high, and thus fireproof requirements of locomotives can be met. The core material and surface layers of the plate are light materials, so that the light-weight requirement of vehicles can be met. The core material and surface layers of the plate are reinforced by fiber, the fiber in the core material can effectively increase the strength and rigidity of the phenolic foam, and the fiber in the surface layers can effectively increase the strength and rigidity of the phenolic plate, so that the obtained sandwich plate has better strength and rigidity.

The invention discloses an air-drying method for improving the quality of alfalfa. The method comprises the following steps of: 1) ridging; 2) selecting materials and treating; and 3) air-drying. The method has the advantages that: 1, the ridging increases the air flow space on the bottom of a grass layer; 2, the fracture of stalks accelerates the evaporation rate of the moisture in the stalks, so that the drying time is shortened; 3, the combination of field ridging and fracturing and air-drying of the stalks has a positive interaction effect on the loss of the moisture of fresh alfalfa forage; 4, the loss rate of the moisture of the fresh alfalfa forage is remarkably and negatively correlative with the residual amount of crude proteins in green hay; 5, the aims of accelerating the drying of the alfalfa, uniformly drying and improving the quality of the green hay are fulfilled; and 6, operation steps are simple and easy, the drying cost is low, and the efficiency is high.

The invention discloses syrup. The syrup is prepared by comprising the steps: performing activated carbon adsorption to mother liquor obtained after crystallization of single-crystal sugar in a crystal sugar preparation process; or, firstly sulfitating the mother liquor obtained after crystallization of single crystal sugar, then carrying out activated carbon adsorption, and then adsorbing with discolored resin, to obtain syrup. According to the syrup, the purity of cane sugar in the syrup is greatly improved, the application field of products is wide, the decomposition reaction of cane sugar can be reduced, and the hyperchromic reaction of glucose and fructose can be decreased; the syrup treatment cost is greatly lowered, in addition, after the purity of the treated cane sugar is improved, the selling price is greatly increased, and the economic benefits of enterprises can be increased; the production efficiency is enhanced; the comprehensive utilization rate of cane sugar can be improved, and the lack situation of cane sugar in China can be improved; and waste syrup does not exist, and the environment pollution can be decreased.

The invention discloses a refining method of isopropenylacetate, which comprises the steps that: an isopropenylacetate crude product is rectified by a first rectifying tower to remove most low-boiling residues to obtain tower bottoms, then the tower bottoms are rectified by a second rectifying tower, and the isopropenylacetate elaboration product is extracted from the liquid phase lateral line discharging materials of the rectifying section of the second rectifying tower. The invention overcomes the defects of the current isopropenylacetate refining method that production capacity is low, the production period is long, the product quality repetitiveness is poor and large-scale series production can not be dissatisfied, or final products can not reach high purity, or investment is large, energy consumption is high and large amount of wastewater is generated, and provides the refining method of the isopropenylacetate. The method can be suitable for large-scale series industrial production, does not need additional components such as entrainer and the like, and has the advantages of simple step, low energy consumption, small loss and high product purity.

The invention provides a preparation method of an epoxy compound, and develops a step-by-step heating preparation process. When the concentration of an oxidizing agent is high, a low-temperature reaction is selected, so that the decomposition reaction of the oxidizing agent is reduced on the premise of ensuring the reaction rate; and when the concentration of the oxidizing agent is reduced, the reaction rate is increased by increasing the reaction temperature, and the side reaction of epoxy compound decomposition is reduced. The process does not need to add the oxidizing agent in batches, so that the complexity of process operation is simplified. Compared with the preparation method reported in the existing literature, the step-by-step heating method ensures the high conversion rate of theoxidizing agent, enhances the selectivity of the epoxidation reaction, simplifies the production operation and enhances the process safety.

The invention provides a high-temperature storage method of a lithium manganate battery. A positive electrode active material of the lithium manganate battery comprises lithium manganate accounting for more than 50% of the total mass of the active material. The high-temperature storage method comprises: heating the assembled lithium manganate battery to 40 to 50 DEG C; injecting a first electrolyte at normal temperature; adjusting the temperature of the battery to be below 10 DEG C; and carrying out constant-current charging to a first predetermined voltage, adjusting the temperature of the battery to 40-50 DEG C, carrying out constant-voltage charging at the first predetermined voltage, injecting a second electrolyte at normal temperature, carrying out constant-current charging and discharging circulation between a charging cut-off voltage and a discharging cut-off voltage for a plurality of times, and storing the battery in an environment with the temperature of 30 DEG C or above. The battery stored by the storage method disclosed by the invention can be stored for more than 100 days in an environment with the temperature of more than 30 DEG C, and the attenuation of the cycle capacity is controlled within 5%.

A natural graphite modification method for a lithium ion battery negative electrode material comprises the following steps: taking Ti(OC4H9)4 and CH3COOLi.2H2O according to mass proportions, carrying out low speed stirring for 10min, adding carbon-nanotube, carrying out ultrasonic dispersion for 10-60min to obtain an LTO nanosphere/carbon nanotube, adding natural graphite, carrying out low speed stirring for 10min, adding ethanol to form sol-gel at 50DEG C, continuously heating on the basis of 50DEG C until ethanol is completely evaporated in order to obtain brown solid powder, drying the brown solid powder at 150DEG C for 8h to obtain LTO precursor solid powder, heating the LTO precursor solid powder under the protection of nitrogen according to a heating rate of 10DEG C/min until the temperature rises 750DEG C, and sintering for 8h to obtain the LTO nanosphere/carbon nanotube coated natural graphite negative electrode material. The method improves the electric conductivity and the structure stability of a natural graphite coating layer.

The invention relates to a method for preparing high-temperature resistant fluorescent glass for an LED and belongs to the technical field of LEDs. The high-temperature resistant fluorescent glass forthe LED is prepared through taking quartz glass as a substrate and adding modified alumina whiskers. According to the method, the quartz glass has the characteristics of isotropy, metastability, no definite melting point and continuity and reversibility of property change; and the quartz glass has an extremely low coefficient of thermal expansion, high temperature resistance, excellent chemical stability and excellent electrical insulating performance, alumina whiskers are a highly heat-conductive material, modified alumina whiskers can be effectively dispersed inside the fluorescent glass and can effectively fill up voids and improve thermal conductivity, and thus, the heat resistance of the fluorescent glass is improved.

The invention provides a process control method of the later period of a sodium hydrosulfite synthetic reaction, aiming at increasing the alcohol and water ratio at the later period of the synthetic reaction and reducing the occurrence probability of a decomposition reaction of sodium hydrosulfite. The method concretely comprises the steps of slowly dissolving solid sodium formate and sodium metabisulfite into a 60-70% methyl alcohol water solution according to the molar ratio of 2: 1; controlling the temperature of a reaction kettle to be 80-85 DEG C, controlling the pressure to be 0.15-0.25Mpa and controlling the pH to be 4.4-5.0; slowly adding liquid sulfur dioxide into the reaction kettle; after the raw material feeding is stopped, slowly adding the mixed solution of sulfur dioxide and methyl alcohol into the raw material; and additionally arranging a set of sulfur dioxide and methyl alcohol matching preparation device on the basis of original production equipment. According to the method and the device provided by the invention, the alcohol and water ratio of a reaction system can be increased, the side reaction is restricted, the purity of the product can be improved to more than 90%, and the safety risk in the production process is reduced.

The invention discloses a preparation process of a mesophase pitch based a protofilament continuous filament. The preparation process comprises the following steps of sending mesophase pitch into a screw extruder through a feeder; heating, by a screw of the extruder, the mesophase pitch, and carrying out reduced pressure deaeration when the screw runs; conveying, by the screw extruder, a melted and deaerated melt into a spinning component through a metering pump, spreading the melt into a spinneret through a spure spreader of the spinning component, and extruding through spinneret orifices ofthe spinneret to carry out spinning; oiling an extrusion-molded fiber bundle, drawing by a drawing roll, and then collecting the filament. A reduced pressure deaeration opening in the preparation process is located behind a final zone; on one hand, the melt in a melting zone can be prevented from being evacuated and broken down to cause that a suction gas is dissolved in the melt. The mesophase pitch is completely molten after passing through a screw melting zone, and is uniformly mixed under the shearing action of a twin screw to be capable of forming a layer of thin and uniform melt in a tank; at the moment, gas bubbles in the interior of the melt can be completely separated through the reduced pressure deaeration. The preparation process is good in production efficiency, and moreover, the prepared mesophase pitch based protofilament is good in performance.

The invention discloses a shrinkage-warping-resistant ASA 3D printing material. ASA resin is used as a raw material, and HIPS, organic montmorillonite, a compatilizer, a heat stabilizer, an antioxidant and a lubricant are added; and the prepared 3D printing material has excellent shrinkage warping resistance, mechanical properties and weather resistance, and is especially suitable for 3D printing in the engineering field. In addition, the invention further discloses a preparation method of the 3D printing material, and the prepared ASA 3D printing material is low in shrinkage warping rate.

The invention relates to a high-strength fusion smelter for colored strengthening smelting. The smelter comprises a smelter wall port, an upper smelter wall, a smelter wall above a liquid line, a liquid line smelter wall, a smelter wall below the liquid line, a secondary working layer, a liquid outlet nozzle and a smelter bottom. All the parts of the smelter are made of fire-resistance materials,by analyzing working conditions of different parts of the high-strength fusion smelter for colored strengthening smelting, different kinds of fire-resistance material brasque are used as the corresponding parts, one or more properties of the erosion resistance, thermal shock resistance, washing resistance and permeability resistance of the brasque at the part are improved, the service life of thebrasque is greatly improved, frequent repairing and brasque replacement are avoided, and a large number of human resources and financial resources are saved.

The invention discloses a high-safety primary lithium-manganese battery and a preparation method thereof. The primary lithium-manganese battery comprises a positive plate, a negative plate, a ceramicdiaphragm, electrolyte and a battery shell, and the positive plate, the ceramic diaphragm, the negative plate and the ceramic diaphragm are sequentially and repeatedly stacked to form a dry battery cell; the primary lithium-manganese battery is prepared by putting a dry battery cell into a battery shell, injecting electrolyte, aging, sealing and aging, and is characterized in that a negative plateis subjected to electrochemical lithium pre-doping, so that a 'fully charged secondary lithium battery negative plate' or a 'zero charged lithium/carbon half battery positive plate' is converted intoa pre-lithiated negative plate; positive plate reserved tabs are arranged on front face and back face of positive plate, and negative plate reserved tabs are arranged on front face and back face of negative plate. According to the primary lithium-manganese battery disclosed by the invention, after the primary lithium-manganese battery is subjected to impact, extrusion and needling tests, the phenomena of firing, deflagration and explosion are avoided, and the safety performance of the primary lithium-manganese battery is higher than that of the traditional primary lithium-manganese battery.

The invention relates to a preparation method of a surfacing coating on a sealing surface of a valve. The preparation method of the surfacing coating on the sealing surface of the valve comprises the following steps of: (1) obtaining cladding powder: firstly blending a metal binding phase and a ceramic reinforced phase according to a proportion, then adding 0.4 to 0.6 percent of CeO2 as a grain inhibitor, and fully mixing through a mechanical method to obtain the cladding powder; (2) heating the sealing surface of the valve; (3) preserving heat, wherein a ceramic fiber heat preservation material is needed for whole-course heat preservation for a large-diameter valve part; and (4) forming a composite hardened coating: adopting a laser cladding mode to clad the mixed cladding powder on the preheated sealing surface of a valve body through a coaxial powder feeding mode so as to form the composite hardened coating. After the three kinds of powder are fully mixed and dried, the mixed powder is cladded on the sealing surface of the valve through a laser cladding technology to form the composite coating, so that the decarburization decomposition behavior of a ceramic phase is reduced, the grain size of the coating is refined, and the purpose of improving the hardness and the abrasion resistance of the coating is achieved.