266 results about "Oxidation stability" patented technology

The invention belongs to the technical field of new energy materials, and particularly relates to siloxane crosslinking modified polyether solid electrolyte and a preparation method thereof. According to the solid electrolyte, the electrophilic ring-opening polymerization reaction of a polymer monomer with an epoxy group is utilized, siloxane is used as a cross-linking agent, polyether chain structures are connected together to form a cross-linked network structure, the ionic conductivity can be increased, and the mechanical strength and the high-temperature dimensional stability can be improved; the lithium ion transference number is increased, the polarization is reduced, and the battery rate capability is improved; the oxidation stability of the electrolyte is improved; the decomposition reaction of polyether at high temperature is inhibited; the thermal stability and the flame retardant property of the polymer electrolyte are remarkably improved, so that the safety of a solid-state battery is improved.

The invention discloses a preparation method of high-temperature transformer oil, and belongs to the technical field of high-temperature transformer oil. Comprising the following steps: 1, carrying out hydrolysis reaction to obtain ricinoleic acid; step 2, carrying out first esterification reaction to obtain a ricinoleic acid esterification product; 3, performing epoxidation reaction to obtain an epoxidized ricinoleic acid esterification product; 4, carrying out ring-opening reaction to obtain ring-opened castor oil; 5, carrying out a second esterification reaction to obtain modified castor oil base oil; and 6, mixing the modified castor oil base oil, a viscosity index improver, an antioxidant, a demulsifying agent and an extreme pressure agent to obtain the high-temperature transformer oil. The invention provides modified castor oil and a preparation method thereof. The high-temperature antioxidant transformer oil prepared by using the modified castor oil as base oil has the characteristics of environmental protection, degradability, high flash point, high breakdown voltage and the like, and also has excellent oxidation stability.

According to the prepared MXene / C electrode material based on PAN carbonization, a nitrogen-doped carbon layer generated through polyacrylonitrile (PAN) in-situ carbonization serves as a supporting spacer to be inserted between MXene nanosheet layers, the MXene nanosheet layers are tightly bridged, the interlayer spacing of MXene is effectively enlarged, re-stacking of nanosheets is inhibited, and in the carbonization process, the MXene / C electrode material can be used for preparing the MXene / C electrode material based on PAN carbonization. Abundant mesopores and fissure holes are generated in the composite material by introducing and decomposing a sacrificial template (PMMA nanosphere), and a three-dimensional through ion transmission channel is constructed; the nitrogen-doped carbon layer not only serves as a supporting spacer to be inserted between MXene nanosheet layers, but also coats the surfaces of the MXene nanosheets,-F end groups on the surfaces of the MXene nanosheets are weakened, and C-O (H) and C-N functional groups are enriched, so that the interface wettability, the conductivity and the anti-oxidation stability of the material are improved, and the material can be widely applied to the technical field of electrochemical energy storage materials.

The application provides an acid ester composite diesel anti-wear agent and a preparation method thereof, and belongs to the technical field of diesel additives, and comprises the following steps: S1, preparing a silanized solid acid catalyst; S2, preparing C18 polyol ester; S3, mixing an acid type anti-wear component and the C18 polyol ester, and then stirring after heating, and then adding tetrahydropyrazole pyridine derivatives and a diluent to continue stirring, and then cooling and filtering to obtain the acid ester composite diesel anti-wear agent. The application can improve the lubricity and anti-wear performance of low-sulfur diesel at a lower additive dosage, and has low corrosion and good oxidation stability.

The application provides a fluorinated ether solvent and an electrolyte applied to energy storage batteries, especially lithium metal batteries, and the fluorinated ether solvent has a structure shown in formula I. By introducing at least one fluorine atom at both ends of an ether molecular chain, the fluorinated ether molecule has excellent salt solubility, the introduction of the fluorine atom can effectively reduce the electron cloud density of ether oxygen to improve the oxidation stability of the ether molecule, and excellent cycle stability of the high-voltage lithium metal battery is achieved; meanwhile, the locally strong polar fluorinated end group can interact with the cation of the salt to improve the ionic conductivity of the electrolyte, and the rapid charge-discharge performance of the high-voltage lithium metal battery is improved.

The application discloses a method and device for producing bright stock, and the obtained bright stock, which comprises the following steps: (1) contacting heavy oil with a hydrogenation catalyst under the presence of hydrogen, and performing hydrogenation reaction under hydrogenation treatment conditions to obtain a hydrogenation product; (2) performing alkylation reaction of aromatics in the hydrogenation product and C10-C20 olefins in olefin oil under the presence of a strong acid catalyst and under alkylation reaction conditions to obtain an alkylation product; and (3) performing distillation separation on the alkylation product to separate and obtain a heavy fraction with a temperature greater than 500 DEG C as the bright stock product. The method provided by the application expands the raw material source of the bright stock, simplifies the process flow, and is convenient for industrial production; and the prepared bright stock product not only has high viscosity and viscosity index, but also has good low-temperature flow performance and high oxidation stability.

The invention relates to a biodegradable hydraulic oil composition and a preparation method of hydraulic oil, and relates to the technical field of hydraulic oil compositions.The hydraulic oil composition comprises, by weight, 20-37% of ester oil, 5-10% of refined vegetable oil and 5-10% of a demulsifier, and the total weight of the ester oil, the refined vegetable oil and the demulsifier is 100%. The content of the refined vegetable oil is 62-79.9 wt%, the content of the demulsifier is 0.1-1 wt%, and the preparation method of the refined vegetable oil comprises the following steps: pre-loading a nanocapsule with an antioxidant as an inner core in activated clay, loading the activated clay pre-loaded with the nanocapsule into deacidified oil, and filtering to obtain the refined vegetable oil. The hydraulic oil composition disclosed by the invention has excellent biodegradability and also has the technical effects of relatively good oxidation stability and viscosity-temperature property.

The embodiment of the application provides an insulating oil, a preparation method thereof and a power transformation equipment. The insulating oil comprises a composite vegetable ester base oil, a synthetic ester additive, a compounded antioxidant and a metal deactivator. The insulating oil has good electrical performance, oxidation stability and environmental protection performance, and can ensure safe and stable operation of the power transformation equipment.

The application discloses a high-absorption carrot juice processing control method based on multi-stage quality detection, and relates to the technical field of food processing. The method comprises the following steps: raw material acceptance and initial physical property detection; low-temperature color protection pretreatment; dynamic pressing and initial filtration; enzyme solubilization treatment to release embedded carotenoids; three-stage high-pressure homogenization to reduce the D[4,3] particle size to below 380 nanometers; instantaneous high-temperature sterilization to promote interface membrane reconstruction; multi-stage quality online detection is implemented at four key nodes; closed-loop parameter feedback adjustment is realized based on detection data through a multivariate regression model; and finally, sterile cold filling and light-proof aging are performed. Through the technical scheme, the application significantly improves the carotenoid retention rate, oxidation stability and in-vitro gastrointestinal simulation absorption rate, the final product absorption rate is stably above 42%, the retention rate is above 92%, and no organic solvent or non-original juice processing means is needed, so the application is suitable for industrialized production of high-value-added pure carrot juice.

The invention relates to new carbon dioxide (CO2) adsorbents based on modified weak base anion exchange resin (WBAER) sorbents comprising a crosslinked polymeric backbone containing appended primary and / or secondary amines. The WBAER materials are insoluble in water and common organic solvents, have surface areas of 5-50 m2 / g, and can be in either bead or powder form. The WBAER materials are suspended in water and / or polar organic solvents and treated with polyfunctional epoxide compounds to effect the modification. The modified materials exhibit significantly improved oxidative stability compared with the unmodified ion-exchange resins without significantly impacting their CO2 uptake capacity or CO2 uptake kinetics. The modified materials remain insoluble in water and common organic solvents and, therefore, are not susceptible to leaching under steam-based or moisture-based sorbent regeneration conditions.

The invention discloses an aero-engine lubricating oil composition and a preparation method thereof, and relates to the field of lubricating oil. The composition comprises a composite base oil system, an antioxidant, an anti-wear reagent at extreme pressure, a corrosion inhibitor, an anti-foaming agent and an optional viscosity index improver, the composite base oil system is composed of high-purity pentaerythritol ester, poly-alpha-olefin and dipentaerythritol ester, wherein the high-purity pentaerythritol ester is synthesized by two-step esterification of pentaerythritol, binary fatty acid and monobasic fatty acid; according to the preparation method, a staged fine blending process is adopted, and vacuum dehydration and degassing, nitrogen protection and multi-stage filtration are combined. Through base oil structure innovation, additive purity control, function cooperation and process optimization, the high-temperature oxidation stability, extreme pressure wear resistance, corrosion resistance and rubber compatibility of the lubricating oil are remarkably improved.

The invention belongs to the technical field of edible oil, and particularly relates to edible oil with a blood fat reducing effect and a preparation method of the edible oil. Comprising the following raw materials in parts by weight: 1 to 10 parts of base oil, 90 to 100 parts of 1-oleic acid-2-palmitic acid-3-linoleic acid triglyceride, 0.3 to 0.5 part of an emulsifier, 0.05 to 0.09 part of an antioxidant and 0.02 to 0.05 part of a stabilizer. The base oil is composed of the sunflower seed oil and the tea seed oil, and the base oil and the 1-oleic acid-2-palmitic acid-3-linoleic acid triglyceride are matched for use, so that the oil has a good blood fat reducing effect, and can effectively reduce cholesterol, maintain cardiovascular health and prevent arteriosclerosis. The antioxidant is composed of the vitamin E, the alpha-mangostin and the oryzanol, all the components have a synergistic effect and jointly improve the oxidation stability of the edible oil, and meanwhile, the antioxidant is matched with the stabilizer, so that the storage life of the edible oil can be effectively prolonged, and the storage stability is improved.

The application discloses a high-entropy cluster electrocatalyst and a preparation method and application thereof, and the high-entropy cluster electrocatalyst comprises a supported substrate of graphene oxide nanosheet and high-entropy clusters in a spinel configuration anchored on the surface of the graphene oxide, and the high-entropy clusters comprise a high-entropy spinel oxide structure composed of multiple metals, wherein the metals are more than five kinds of Co, Mn, Ni, Zn, Cu, Cr and Mg. The application realizes anchoring of the high-entropy oxide clusters on the surface of the graphene oxide, and the multi-component synergistic effect and the heterojunction charge optimization characteristics of the high-entropy oxide clusters improve seawater oxidation activity; the high-entropy stability characteristics and the strong carrier interaction promote the seawater oxidation stability of the catalyst, and the catalyst has better alkaline seawater oxidation performance.

The invention relates to the technical field of wastewater treatment, in particular to a bifunctional catalyst as well as a preparation method and application thereof. The catalyst comprises noble metal nanoparticles and a porous carbon layer coating the surfaces of the noble metal nanoparticles, the noble metal is selected from one or more of Pd, Rh and Ru; the specific surface area of the porous carbon layer is 150-1000m < 2 > / g, and the pore size distribution is 0.1-5nm; and transition metal elements are doped in the porous carbon layer. By means of the unique structure that the precious metal nanoparticles are coated with the porous carbon layer, dual purposes of one material are achieved, and excellent cathode electro-catalysis nitrate reduction (ENRR) activity and anode sulfide oxidation (SOR) stability are achieved at the same time. According to the catalyst, an ENRR and SOR coupled electro-catalysis system can be constructed at the same time, nitrate in wastewater is efficiently reduced into ammonia with high added value in a single system, sulfide is oxidized into elemental sulfur, and therefore removal of pollutants and recovery of valuable resources are completed synchronously.

The application discloses a kind of perfluoropolyether nanocomposite grease and preparation method thereof, belong to the technical field of lubricating material.The lubricating grease includes perfluoropolyether base oil, polytetrafluoroethylene thickener and composite nano additive, wherein the composite nano additive is composed of surfactant modified antiwear additive, structure stabilizer, rust and oxidation inhibitor.Antiwear additive is one of nano copper, nano cerium oxide, nano titanium oxide and molybdenum sulfide, structure stabilizer is one of nano silicon oxide and porous alumina, and rust and oxidation inhibitor is nano zinc oxide.The composite nano additive is introduced in the form of perfluoropolyether oil phase dispersion, and is homogenized with thickener under the condition of 150~260℃ after dispersion and mixing.The application realizes the synchronous improvement of lubricating grease wear resistance, colloid stability, rust and oxidation resistance and oxidation stability through the synergistic effect of various nanomaterials, and is suitable for harsh working condition environment such as high temperature, high load, high vacuum and strong corrosion.

The invention discloses polyunsaturated fatty acid microcapsule powder as well as a preparation method and application thereof, and belongs to the field of foods. The microcapsule powder comprises the following raw materials: a core material solution prepared from 10-25% of polyunsaturated fatty acid and 0.5-2% of an emulsifier, and a wall material solution prepared from 2-5% of sodium caseinate, 3-6% of reducing sugar, 15-25% of modified starch and 40-60% of distilled water through heating and stirring. Wherein the mass ratio of the polyunsaturated fatty acid to the wall material is (1: 1.2)-(1: 1.5); and mixing the wall material solution and the core material solution, stirring and shearing, homogenizing and emulsifying at high pressure, sterilizing, and spray-drying to obtain the polyunsaturated fatty acid microcapsule powder. According to the present invention, the fishy smell of the polyunsaturated fatty acid can be covered, and effects of high oil loading capacity, high oxidation stability, high absorption rate, simple process and low cost are provided.

The application discloses a DHA gel soft candy with high oxidation stability and a preparation method thereof, and belongs to the technical field of health-care food. The preparation method specifically comprises the following steps: (1) Pickering particle dispersion liquid preparation; (2) Pickering emulsion preparation; and (3) DHA gel soft candy preparation. The innovation of the application is that the Pickering emulsion is introduced into the traditional soft candy to form a double-layer encapsulation system, realize high oxidation stability of functional oil and grease, and upgrade the production technology of the traditional soft candy. The key points are as follows: ① good stability, no oil seepage and no stratification of the Pickering emulsion within a shelf life of 6 months, and no oil outflow phenomenon of the soft candy; and ② flavor optimization (effective masking of fishy smell), formation of a complete double-layer encapsulation system and reduction of the release of fishy smell substances.

This invention discloses a microfluidic method for preparing fish oil microspheres based on viscosity control and its application, belonging to the field of functional food preparation technology. The method involves constructing three viscosity systems (3.47–15.19 mPa·s) by compounding concentrated fish oil and castor oil at a specific volume ratio. Using a 3% polyvinyl alcohol aqueous solution as the continuous phase, water-in-oil fish oil microspheres are prepared under constant pressure in a cross-shaped microfluidic chip. By controlling the viscosity of the oil phase, the microsphere particle size can be precisely controlled within the range of 53.89–72.34 μm, with a coefficient of variation ≤5% and regular morphology. The obtained microspheres exhibit excellent particle size stability under pH 5–7 and 0–2% NaCl conditions. The high-viscosity microspheres show significantly lower acid values ​​and thiobarbituric acid reactant values ​​compared to the low-viscosity group under storage conditions of 4–60℃, with an oxidation stability improvement of over 30%. In vitro digestion experiments show that the low-viscosity microspheres reach peak free fatty acid release rate after 120 min, while the high-viscosity group exhibits a sustained-release effect. This invention achieves simultaneous optimization of fish oil microsphere particle size, stability, and digestive behavior, providing a theoretical basis and precise process parameters for the structured design of ω-3 polyunsaturated fatty acid functional foods.

The invention discloses a high-stability electrolyte suitable for a lithium metal battery and the lithium metal battery. The electrolyte comprises a lithium salt and a mixed solvent system composed of specific three-dimensional network coordination ether, linear ether and a third solvent. According to the electrolyte, a firm and stable interface film is formed on the surface of a lithium metal negative electrode, lithium dendrite growth and side reaction are effectively inhibited, meanwhile, the electrolyte has high oxidation stability and can be matched with a high-voltage positive electrode, the three-dimensional network coordination ether weakens the lithium ion-solvent coordination effect, the rate performance of the electrolyte is improved, and the service life of the electrolyte is prolonged. And the cycle life, coulombic efficiency, rate capability and safety performance of the lithium metal battery are obviously improved.

The invention relates to a food processing technology, and discloses a stress relaxation microchannel guided low-fat high-oxidation-stability nut preparation method. The method comprises the following steps: adjusting the content of nut meat in an aqueous solution containing an antioxidant to 8-12% (dry basis), and then carrying out phase change induced stress treatment to form a micro-fracture network communicated with the outer surface in the interior; then increasing the pressure to 3 to 10 MPa at the speed of 1.0 to 2.5 MPa / min, and maintaining the pressure, wherein the hot / trap is 1.5 to 1.8; and rapidly relieving pressure and discharging residual oil at (2.5-3.5) v1, and rapidly shaping by adopting high-energy drying for 2-10 minutes by adopting radio frequency / infrared / microwave vacuum and the like. According to the method, the degreasing efficiency and the size stabilization rate are improved under the low pressure intensity, surface residual oil is reduced, flavoring is promoted, and the storage oxidation stability is improved.

The invention relates to a preparation method and application of a sulfonated covalent organic framework modified perfluorinated sulfonic acid resin composite proton exchange membrane, and the sulfonated covalent organic framework modified perfluorinated sulfonic acid resin composite proton exchange membrane is prepared from the following raw materials: perfluorinated sulfonic acid resin, 2, 4, 6-triformyl phloroglucinol and 2, 5-diaminobenzene sulfonic acid. The sulfonated covalent organic framework in the sulfonated covalent organic framework modified perfluorosulfonic acid resin composite proton exchange membrane has a rigid framework, and has relatively strong intermolecular interaction with perfluorosulfonic acid resin, so that the swelling problem can be effectively relieved while the hydrophilicity of the proton exchange membrane is improved; rich sulfonic acid groups in the sulfonated covalent organic framework structure can be used as additional proton transmission sites, so that the proton conductivity, the electrochemical performance, the mechanical strength, the antioxidant stability and the thermal stability of the composite membrane are improved.

Lubricating oil composition is provided. The composition includes several components including a major amount of a base oil, a mixture of alkylated diphenylamines having a weight ratio of mono-alkylated diphenylamine to di-alkylated diphenylamine ranging from 0.6 to 4.0, and a molybdenum or sulfur additive that provides synergistic enhancement of oxidation stability in combination with the mixture of alkylated diphenylamines.

The invention belongs to the technical field of biochemical engineering, and discloses a method for promoting schizochytrium limacinum to quickly accumulate Omega-3 fatty acid by using a natural antioxidant and application of the schizochytrium limacinum, the method comprises the following steps: performing fermentation culture on the schizochytrium limacinum, adding a mixed exogenous antioxidant melatonin and a rosemary extract in the fermentation culture process, and performing fermentation culture on the mixed exogenous antioxidant melatonin and the rosemary extract to obtain the Omega-3 fatty acid-containing schizochytrium limacinum. The melatonin and rosemary extract mixed antioxidant can interact to regulate fermentation in schizochytrium limacinum to increase fatty acid synthesis and oxidation stability. According to the present invention, in the experiment of schizochytrium limacinum fermentation oil production, the addition of the specific amount of the mixed antioxidant composition during the fermentation results show that the oil yield can be increased, the PUFA ratio in the specific concentration range can be significantly increased by 32%, the PUFA use amount can be reduced by 40% through the compounding use, and the method can save manpower, material resources and cost, and can provide the good application prospect. The grease production efficiency is greatly improved, and the method is suitable for industrial production.

This invention discloses a method for assessing the long-term heavy metal release risk of biochar based on chemical oxidation simulation. The method includes: first, naturally culturing homologous biochar samples in soil to obtain a baseline value W0 for the target heavy metal release ratio; simultaneously, conducting a standardized accelerated aging experiment with an oxidant solution; and determining the number of aging cycles N required to reach W0 by comparison, thereby establishing a quantitative conversion relationship between "number of aging cycles" and "natural aging time". Then, the same accelerated aging experiment is performed on the biochar to be tested, and the number of experimental cycles is converted into an equivalent natural aging time using the quantitative relationship. A long-term release kinetic prediction model is then fitted and constructed, ultimately achieving rapid and quantitative prediction of the cumulative heavy metal release ratio after a target number of years. This invention provides an efficient and reliable tool for assessing the long-term chemical oxidation stability of biochar.

The invention relates to a surface modified electrolyte membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing sulfide electrolyte, a binder and a solvent to obtain slurry, and coating to obtain a sulfide electrolyte membrane; (2) coating the polymer precursor solution on the surface of the sulfide electrolyte membrane to obtain a modified layer; and (3) heating to initiate a polymerization reaction to obtain the surface modified electrolyte membrane, the polymer precursor solution comprises a polynitrile compound. According to the invention, the polynitrile compound with high polarity and high oxidation stability is used on the positive electrode side, and the polynitrile compound is in contact with a high-voltage positive electrode interface, so that the decomposition of electrolyte is reduced. The surface modified electrolyte membrane prepared by the preparation method disclosed by the invention has excellent stability on a high-voltage positive electrode, and adverse side reactions of a sulfide electrolyte and the high-voltage positive electrode can be reduced.

The invention provides an oxidation stability evaluation method, detection equipment and a detection method for agent-free transformer oil, and belongs to the technical field of power grid power transmission and transformation. According to the method, copper wires are added into the agent-free transformer oil, air is introduced into the agent-free transformer oil at a preset experimental temperature in a preset experimental period, oxidation of the agent-free transformer oil is accelerated, and the conductivity value of volatile acid in the oil oxidation process is continuously monitored; and evaluating the oxidation stability of the transformer oil without the additive according to the conductivity value of the volatile acid in the preset experimental period. According to the method, the oxidation stability evaluation efficiency of the agent-free transformer oil is improved, the working intensity and technical requirements of operators are reduced, and the cost is reduced.

The invention relates to a coenzyme Q10 soft capsule and a preparation method thereof, and belongs to the technical field of health care products. The problems that an existing product wall material is insufficient in compactness and poor in stability, and contents are prone to seeping out are solved. The soft capsule is composed of a content and a wall material according to a specific mass ratio, the content contains coenzyme Q10, soybean oil, vitamin E and phospholipid, and the wall material contains gelatin, glycerin, an aloe-tremella mixed extract and purified water. The aloe-tremella mixed extract is prepared through pretreatment of fresh aloe, preparation of tremella powder, construction of a mixed system, ultrasonic extraction and post-treatment, natural active mucopolysaccharide and tremella polysaccharide contained in the aloe-tremella mixed extract can be synergistically crosslinked, and the aloe-tremella mixed extract, gelatin and glycerin jointly construct a compact wall material structure. The preparation method is simple in process, easy in parameter control and free of special equipment, the product can improve illumination and oxidation stability and reduce the content exudation rate, physicochemical properties and use safety are both considered, and the preparation method is suitable for industrial production.

This invention relates to a silicon carbide ceramic matrix composite material reinforced with unidirectional silicon carbide fibers and its preparation method, comprising: 1) winding silicon carbide fibers in the same direction to obtain a unidirectional tape; 2) depositing an interface phase on the surface of a single fiber using chemical vapor deposition; 3) preparing a prepreg slurry by mixing carbon powder, dispersant, etc.; 4) impregnating the unidirectional tape with the slurry to obtain a prepreg tape; 5) layering the prepreg tape and the unimpregnated unidirectional tape at a layer ratio of 1:1 to 16:1 and a silicon carbide fiber angle of 0° to 90°; 6) obtaining the composite material through curing, pyrolysis, and melt infiltration densification. This invention breaks away from the traditional single-layer layup mode, constructing a continuous gas flow path through mixed layering, guiding process gas generation, solving the drawbacks of high porosity and matrix cracking, optimizing the material's stress state, and obtaining a composite material with both low density and high compactness, excellent mechanical properties at room temperature and high temperature, and excellent oxidation stability, shortening the preparation cycle, and meeting extreme service requirements.

A filter oil composition and a method for removing airborne molecular contaminants from air are provided. The composition includes a first portion comprising paraffinic oil by volume of the composition, a second portion comprising polyalphaolefin by volume of the composition, and a third portion comprising red dye by volume of the composition. Applying the filter oil composition to a cotton air filter material causes tackiness throughout the air filter material, thereby enhancing filtration of air passing through the filter. The composition generally is substantially non-reactive, has excellent oxidation stability, possesses good thermal stability, and retains a suitable viscosity at a normal operating temperature of an automobile engine. In an embodiment, the composition comprises 96.74% paraffinic oil by volume, 3.20% polyalphaolefin by volume, and 0.06% red dye by volume. The viscosity of the composition at 100 degrees-C ranges between substantially 7.2 and 7.6 centistokes (cSTs).