73results about How to "Process environmental protection" patented technology

The application discloses a preparation method of three-dimensional hollow carbon spheres. The three-dimensional hollow carbon spheres are prepared by one-step pyrolysis method through the three-dimensional network structure of melamine foam and the compounding of MOFs materials. The method is simple in process, environment-friendly, low in cost and capable of industrial production. The three-dimensional hollow carbon spheres prepared by the method have uniform and good micro-morphology, the carbon spheres are hollow in the inside, each carbon sphere has four branches connected with other carbon spheres, and multiple carbon spheres are connected to form a three-dimensional network structure.

The application discloses a method for preparing xanthine from guanine by using an enzyme as a catalyst and application thereof, and belongs to the technical field of bioengineering. The method comprises the following steps: dissolving guanine in water to prepare a 2%-20% solution, adding guanine deaminase, and reacting at 40-50 DEG C and pH 6.5-7.5 for 20-40 hours; and then filtering and drying to obtain xanthine. The amino acid sequence of the guanine deaminase is shown as SEQ ID NO. 1, and the guanine deaminase can be obtained by expressing recombinant Escherichia coli. The method has the advantages of mild reaction conditions, high specificity, no by-products, a xanthine yield of more than 90%, high purity of more than 99%, green environmental protection, cost advantage and suitability for industrial production.

The invention relates to the technical field of aluminum material processing oil, and particularly discloses an environment-friendly residue-free aluminum material processing oil composition and a preparation method thereof. The environment-friendly residue-free aluminum product processing oil composition is prepared from the following raw materials in parts by weight: 60 to 100 parts of polyglycol ether, 2 to 17 parts of synthetic ester, 0.5 to 2.5 parts of antioxidant, 0.1 to 0.5 part of metal corrosion inhibitor and 0.1 to 3 parts of tackifier. The synthetic ester comprises star-shaped complex ester, and the star-shaped complex ester comprises the following raw materials: pentaerythritol, oleic acid, phenylphosphonic acid and boric acid. The environment-friendly residue-free aluminum product processing oil composition disclosed by the invention can be used for forming and processing aluminum products, can effectively inhibit oxidation caused by factors such as high-temperature friction heat and metal catalysis in a cyclic heating process under heavy-load and high-temperature working conditions, can realize almost no residue after aluminum product post-treatment at 540 DEG C, ensures that the surfaces of the aluminum products are bright and free of discoloration, and has the advantages of simple process, low cost and the like. And the subsequent cleaning procedure is omitted.

This invention relates to a flame retardant with both microwave absorption and smoke suppression functions. The flame retardant is a hierarchical porous metal-organic framework material with a three-dimensional polygonal structure, a size of 1-3 μm, and a pore size distribution between 1.0-50.0 nm. It carries nano-transition metal oxides internally and on its surface, with the nano-transition metal oxides accounting for 25%-65% of the total mass. The flame retardant provided by this invention possesses microwave absorption, flame retardancy, and smoke suppression properties. Its initial decomposition temperature is 442℃±10℃, with significant mass loss in the temperature range of 450-700℃. At 800℃, the residue content is as high as 50% or more, exhibiting excellent thermal stability and meeting the processing requirements for flame retardants in polyurea, epoxy resin, and polycarbonate.

The application discloses a method for preparing polyethylene wax by using a carborane bridged rare earth metallocene catalyst, and simultaneously preparing a carborane bridged indenyl rare earth metallocene compound as a main catalyst, loading the prepared main catalyst and a cocatalyst on a magnetic mesoporous Fe3O4@Al2O3 core-shell nanoparticle carrier to obtain a supported rare earth metallocene catalyst; the main catalyst of the application is a carborane bridged indenyl rare earth metallocene compound with a structure shown in formula (I), wherein a bridging group adopts a closed carborane (closed-1,2-dicarbadodecaborane), and the cage-like three-dimensional structure has super-high thermal stability and chemical inertness and does not degrade or rearrange in a high-temperature molten state of 130-200 DEG C. Large-volume substituents such as methyl, tert-butyl, phenyl or 4-tert-butylphenyl are introduced on the indene ring to provide sufficient steric protection and further inhibit chain transfer and side reactions at high temperatures.

The invention relates to the field of photovoltaic power generation, and mainly relates to a Fe2O3 nanorod array perovskite solar cell and a preparation method thereof. The preparation method of the Fe2O3 nanorod array perovskite solar cell is provided for solving the problems that in the prior art, a physical coating technology is complex in process, high in cost and low in production efficiency. A Nb-TiO2 compact layer is prepared through a hydrolysis-pyrolysis method, a Fe2O3 nano array is prepared through a hydrothermal method, a CH3NH3PbI3-xBrx thin film is prepared through a continuous two-step deposition method, a hole transport layer is prepared through a deposition method, and the Fe2O3 nano rod array perovskite solar cell is prepared. The method is simple and environment-friendly in process, low in cost and high in production efficiency.

The invention relates to the technical field of aerogel, and provides a super-hydrophobic flexible aerogel heat insulation film as well as a preparation method and application thereof. The aerogel film comprises aerogel particles subjected to hydrophobic modification treatment and an in-situ fiberized fiber binder, the aerogel particles subjected to hydrophobic modification treatment are wound and anchored by a three-dimensional network structure formed by the in-situ fiberized fiber binder. The aerogel particles subjected to hydrophobic modification treatment and the fiber binder are used as raw materials, a specific process is adopted for processing, a fiber three-dimensional network anchored aerogel particle composite structure is constructed, the problem of aerogel brittleness and the process problem of uniform fibrosis of the fiber binder are solved, and the fiber three-dimensional network anchored aerogel particle composite structure is obtained. The preparation of the aerogel film with excellent comprehensive performance is realized.

This invention discloses a method for processing high-transparency and high-colorfastness wool cellulose fiber segment-dyed and spray-dyed yarn using multi-enzyme synergistic pretreatment and its application. The processing method includes: yarn pretreatment, keratinase pretreatment, synergistic treatment of keratinase and protease, cellulase treatment, synergistic inactivation of multiple enzymes and pH control, preparation of anionic pigment paste, segment-dyed spray-dyeing, and drying and curing fixation. The synergistic pretreatment of keratinase, keratinase, protease, and cellulase forms a technical chain of barrier breaking, loosening, chain reduction, and coarsening, resulting in a dye penetration index of >80% for the pigment spraying. The pH-controlled wool fibers carry a strong positive charge, which strongly electrostatically adsorbs with the anionic pigment paste, achieving a dry rubbing colorfastness of 4-5 and a wet rubbing colorfastness of 4. The fiber strength loss is small, and the method is environmentally friendly. It is suitable for segment-dyed and spray-dyed yarns of pure wool and blended yarns of wool with cellulose fibers such as cotton, viscose, Tencel, and Modal, and can be widely used in home textiles, clothing, and other fields.

The application discloses a kind of water-based dispersant and preparation method thereof, belong to pigment dispersant technical field.The water-based dispersant is random copolymer obtained by radical copolymerization of maleic acid mono-aromatic ester intermediate and hydrophilic polymerizable monomer, and hydrophilic carboxyl group and hydrophobic benzyl side chain or phenylethyl side chain are distributed in the side group of its molecular main chain.The dispersant is prepared by esterification, neutralization and water phase copolymerization three-step reaction, the preparation process of the application is green and environmentally friendly, no organic solvent residue, the obtained dispersant realizes pigment anchoring through the π-π conjugation of hydrophobic side chain, and the hydrophilic carboxylate group realizes electrostatic stabilization, and the double synergistic effect significantly improves dispersibility and storage stability, especially suitable for phthalocyanine blue and other aromatic ring-containing pigments dispersion, and can be widely applied in the field of paint, ink and the like.

The utility model discloses a novel feed hopper sealing structure for household garbage power generation, relates to the technical field of household garbage power generation, aims to solve the problems that an existing sealing structure is prone to being blocked and abraded and inconvenient to maintain, and comprises a feed hopper, an upper sealing plate and a lower sealing plate. The inclination degrees of the front plate and the rear plate are different. The two groups of upper sealing plates are symmetrical to a top opening of the feeding hopper, are matched with upper reset grooves through traction columns and guide columns, and are reset by upper reset springs to realize top sealing; according to the feeding hopper sealing structure, through double sealing and cooperation of all parts, the problems that an existing feeding hopper sealing structure is poor in sealing performance, unsmooth in feeding and the like are solved, and the feeding hopper sealing structure has the advantages of being excellent in sealing performance, smooth in feeding, stable, reliable, convenient to maintain and the like; odor dust can be effectively prevented, the equipment environment is maintained, and the power generation efficiency is improved.

The invention belongs to the field of agricultural fertilizers, and provides a micro-mineral activator and an application thereof in improving the fertilizer efficiency of a bio-organic fertilizer. According to the invention, epoxy silane coupling modified potassium feldspar powder is adopted as a core to construct a two-phase collaborative design of humic acid coated core-shell composite powder IM-X and metal ion crosslinked microgel powder IM-Y; the balance between the compressive strength of the particles and the rapid disintegration and dispersion performance when encountering water is realized, the consideration of a high-solid-content low-water-adding-amount granulation process window and the rheological stability of a humic acid cross-linked network is considered, and the unification of moisture absorption and caking resistance during storage and transportation and water absorption and retention ion response regulation and control functions after application is realized; the mineral-organic composite additive solves the performance coupling contradiction of natural conflicts in physical and chemical mechanisms of the existing mineral-organic composite additive, has the advantages of good processing controllability, excellent storage and transportation stability and remarkable fertilizer efficiency improvement effect, and has wide application value in the field of bio-organic fertilizer synergism.

The invention discloses a method for efficiently purifying gardenia blue pigment based on combination of ion exchange resin and an ultrafiltration membrane, and belongs to the technical field of natural pigment purification. The method comprises the following steps: adjusting the pH value of a gardenia blue pigment crude product solution to 5.0-7.0, pretreating, loading to anion exchange resin for adsorption, sequentially carrying out gradient elution by using 5% and 10% NaCl aqueous solutions, collecting pigment eluents with different molecular weight proportions, separating by using an ultrafiltration membrane with the molecular weight cut-off of 1000-4000 Da, and finally concentrating and drying. According to the method, efficient and specific removal of gardenoside, genipin and methanol is synergistically realized through charge selective adsorption and gradient elution of ion exchange resin in combination with precise screening of an ultrafiltration membrane, meanwhile, the pigment recovery rate is greater than 95%, the product impurity residue is low, the process is green, and the method is suitable for industrial production.

The invention discloses a direct high-temperature regeneration method of a waste lithium iron phosphate positive plate in a water vapor atmosphere. The method comprises the following steps: directly placing the positive plate obtained by discharging and disassembling the waste lithium iron phosphate battery into a reaction container, directly regenerating at 600-650 DEG C by taking superheated steam as a gasification medium, and removing aluminum foil after the regeneration process is completed, thereby obtaining the regenerated lithium iron phosphate positive plate. According to the method provided by the invention, the structure of lithium iron phosphate can be completely repaired at a relatively low temperature, and aluminum foil fusion is avoided. Compared with a traditional recycling process, the method has the advantages that complex pretreatment steps such as smashing, screening and stripping are omitted, material loss is reduced, the whole process is mild and environmentally friendly, and the method is short in process and easy and convenient to operate.

The utility model relates to a novel embedded packaging structure, including PCB board, chip and backing plate, the upper surface of backing plate is opened with mounting hole, the chip sintering is installed in mounting hole and is flush with the upper surface of backing plate and forms chip unit, the lower surface of PCB board is connected with a plurality of chip unit. This structure directly adopts the backing plate of copper material and is welded or sintering connection with PCB, need not to be plated copper, has reduced the process complexity, has reduced the chip warping risk, and the process is more environmental protection;The present application need not laser drilling, uses mature mechanical drilling + plating process instead reduces the process complexity, improves the yield rate;Move the chip to the outside of PCB, avoid the warping deformation caused by the big CTE difference between chip and PCB material, avoid the equipment damage, the mounting difficulty etc. caused by the high warping of PCB;The radiator is in direct contact with the backing plate through the connecting layer, and the heat dissipation path is shorter, the thermal resistance is lower, and the heat dissipation efficiency is improved.

The invention belongs to the technical field of composite material preparation, and discloses a crustacean waste-based composite material and a preparation method thereof. According to the method, the eutectic solvent is used as a green extraction medium, mineral substances and protein in the crustacean waste are synchronously recycled through a green and efficient process, and the crustacean waste is compounded with starch and plant fibers to be used for preparing the high-performance starch-plant fiber composite material. According to the method, high-value utilization of mineral substances and protein components in the crustacean waste is achieved, the problem of environmental pollution caused by the waste is effectively solved, meanwhile, a new strategy is provided for developing a high-performance composite material, and full-component recycling of the waste is achieved.

The invention relates to a catalyst for hydrogen production through seawater electrolysis based on a metal ruthenium-doped copper nanowire composite structure and a synthesis method thereof, and belongs to the technical field of catalysis, the catalyst is composed of a copper nanowire skeleton derived from foamy copper and metal ruthenium clusters uniformly distributed on the surface of the copper nanowire skeleton; the method comprises the following steps: placing foamy copper in a solution containing sodium hydroxide and an oxidizing agent to generate a copper hydroxide nanowire; metal ruthenium is introduced by dipping in a solution containing ruthenium salt; and carrying out inert atmosphere heat treatment and electrochemical reduction to obtain the ruthenium-cluster-loaded copper nanowire composite catalyst. The fine regulation and control of the structure and components of the catalyst are realized by adjusting the concentration of the reaction solution, the dipping time and the treatment conditions. The electrocatalyst shows excellent hydrogen evolution activity and long-term stability under the acidic seawater electrolysis condition, the problems that a nickel-based current collector is prone to corrosion in an acidic medium and a traditional platinum-based catalyst is prone to inactivation in natural seawater are effectively solved, and a new technical scheme is provided for efficient and stable seawater electrolysis hydrogen production.

The application discloses a kind of polyionic liquid modified self-supporting biochar electrode and its application in the field of capacitive deionization, belong to water treatment field.The application is deposited in self-supporting biochar electrode BSC surface by 1-vinyl-3-ethyl imidazole double trifluoromethanesulfonyl imidate salt ([VEIM][NTf2]), and polyionic liquid modified self-supporting biochar electrode is obtained;Afterwards, polyionic liquid modified self-supporting biochar electrode is used as electrode, and capacitive deionization desalination is carried out, and the salt adsorption capacity SAC of unit area A It can be as high as 0.921mg / cm 2 ; Strength is enough to withstand water flow impact in CDI operation.

The application belongs to the field of water treatment, and particularly relates to a high-porosity compressed silver-loaded activated carbon filter element and a low-temperature bonding manufacturing method thereof, aiming to solve the technical problems of low porosity, poor silver loading stability and high-temperature process destroying the pore structure of the existing activated carbon filter element. The filter element adopts plasma surface activation pretreatment to introduce oxygen-containing functional groups on the surface of the activated carbon as chemical anchor points of silver, realizes the bimodal silver spatial distribution of microporous ionic silver and mesoporous nano silver clusters through hierarchical silver loading treatment, utilizes a composite adhesive system to cooperate with a low-temperature molding and steam setting process, and finally constructs a through microchannel network through the removal of a pore-forming agent. Through the adoption of the above technical scheme, the application can realize high-porosity retention rate, significantly improve the silver loading stability and antibacterial durability, achieve the balance of high strength and low water flow resistance, and the process is green and environmentally friendly, and is suitable for large-scale industrial production.

The invention relates to a preparation method of a nickel-based electrode and a method for electrocatalytic oxidation of 5-hydroxymethylfurfural (HMF) by using the nickel-based electrode. The nickel-based electrode comprises a substrate material and a catalyst layer, and the catalyst layer is nickel hydroxide in different forms or chromium-doped nickel hydroxide. According to the chromium-doped nickel hydroxide electrode, the catalytic performance of electrooxidation of HMF into 2, 5-furandimethyl (FDCA) can be greatly improved. Taking the nickel-based electrode as an anodic oxidation electrode, taking metal platinum as a cathode electrode, respectively filling two sides of a double-chamber electrolytic cell separated by an ion exchange membrane, adding an alkaline electrolyte into two sides of the electrolytic cell, and adding an HMF solution into the anode side; the electrocatalytic oxidation method is carried out in the electrolytic cell under a certain voltage, the anode is subjected to an HMF electrooxidation reaction and is converted into FDCA, and the cathode is subjected to an electrolytic water hydrogen evolution reaction. The nickel-based catalyst can efficiently electro-catalyze HMF to be oxidized into FDCA, meanwhile, the electrolytic water hydrogen evolution reaction is coupled, and the nickel-based catalyst has excellent catalytic efficiency and stability.

This invention discloses a high-purity fluorobenzene recovery process in the production of 1,4-bis(4-fluorobenzoyl)benzene, belonging to the field of organic waste liquid recovery technology. Step 1 involves reacting the fluorobenzene waste liquid through a tubular reactor containing anhydrous aluminum chloride particles to obtain dehydrated fluorobenzene waste liquid. The reaction temperature is 5-40℃, the residence time is 60-200 min, and the flow rate of the fluorobenzene waste liquid is 0.1-0.4 m / min. Step 2 involves filtering the dehydrated fluorobenzene waste liquid through a micron filter, then distilling it in a fluorobenzene distillation column. The organic vapor at the top of the column is compressed by a compressor, heat-exchanged by an MVR heat exchanger, condensed, and then refluxed in a reflux tank. High-purity fluorobenzene is obtained from the fluorobenzene distillation column, wherein the fluorobenzene purity is greater than 99.99 wt% and the water content is less than 10 ppm. This invention uses fluorobenzene waste liquid from the production process of 1,4-bis(4-fluorobenzoyl)benzene as raw material. Through reaction dehydration, crystalline aluminum chloride filtration and distillation, it achieves continuous batch production of high-purity fluorobenzene. The process is simple and has low energy consumption.

The application relates to the field of lithium ion battery electrolyte additives, in particular to a high-yield synthesis method of high-purity tris(trihydrocarbylsilyl)borate, and the synthesis steps are as follows: first, urea and hexahydrocarbyldisilazane are reacted to prepare hexahydrocarbyldisilourea; second, boric acid and the hexahydrocarbyldisilourea are reacted to obtain tris(trihydrocarbylsilyl)borate crude product; third, the crude product is purified to obtain high-purity tris(trihydrocarbylsilyl)borate. The synthesis method provided by the application has the advantages of high reaction conversion rate and yield, high product purity, recyclable filter residue and solvent after reaction, reduced waste emission and green and environment-friendly process.

This invention belongs to the field of materials application and resource recycling, and provides a CaCl₂ 2 Purification agents, materials, apparatus, and methods for solutions. This invention utilizes low-value materials, such as seashells, primarily composed of calcium-based materials, as the main component of the crystallizing agent. Natural organic matter, such as wood flour and straw, is used as the carbon source. After mechanical activation and hydrothermal treatment, the crystallizing agent is obtained by calcination under nitrogen protection. This purification material can be used in various CaCl₂ solutions. 2 Applications in solution purification. The crystallization inducer of this invention has mild preparation conditions, inexpensive materials, and strong targeting, enabling low-cost and efficient removal of CaCl₂. 2 Impurities such as sulfate in the solution.

The utility model relates to the technical field of framework processing, in particular to welding equipment for processing an automobile seat framework, which is characterized in that one side of the welding equipment is fixedly connected with a processing box, the inner side of the processing box is rotatably connected with a rotating pipe, the rotating pipe is sleeved with a filter cartridge, and one side of the bottom of the processing box is fixedly connected with a driving motor through a bolt; the bottom end of the rotating pipe penetrates through the bottom of the treatment box and is in transmission connection with an output shaft of the driving motor, a plurality of air outlet holes are formed in the rotating pipe, a fan is fixedly connected to one side of the outer wall of the treatment box through bolts, and an inlet of the fan communicates with one side of the treatment box. Smoke dust generated in the welding process can be efficiently treated, the air quality of a workshop is remarkably improved, the body health of operators is guaranteed, and meanwhile the requirements of the modern manufacturing industry for environment-friendly emission and occupational health and safety are met; in addition, the filter cartridge is matched with the rotating design of the rotating pipe, so that the filtering efficiency is improved, the service life of the filter cartridge is prolonged, and the maintenance frequency and cost are reduced.

The present application belongs to the technical field of electrolytic synthesis of non-ferrous metals and alloys, and discloses a method for preparing ferrotitanium alloy by electrolyzing ilmenite or high-titanium slag in a boron-containing molten oxide system. A titanium raw material is mixed into a B2O3-CaO-CaF2-SiO2 system after dehydration to form a melt; the melt is placed in a crucible and put into a sealed reactor; a cathode and an anode are put in, and a certain distance is kept between the two, and inert gas protection is provided; the temperature is raised to the working temperature, and electrolysis is carried out for a certain time; the product is taken out after cooling, washed with dilute acid and distilled water, and dried. The addition of B2O3 to the CaO-CaF2-SiO2 system for high-temperature molten oxide electrolysis can accelerate the dissolution of TiO2 in ilmenite and high-titanium slag, reduce the melting point of the molten salt, increase the migration rate of titanium ions, reduce the melt viscosity, and significantly improve the dissolution efficiency of TiO2 and the efficiency of electrolytic titanium.

The invention relates to a synthesis method for improving the conversion rate of propylene glycol n-methyl ether, which comprises the following steps of: firstly, mixing raw materials, namely methanol and epoxypropane, sequentially introducing the mixed raw materials into three stages of horizontal reactors, and carrying out etherification reaction on the mixed raw materials and solid acid catalysts in the horizontal reactors at multiple stages of temperatures to obtain the propylene glycol n-methyl ether. And after the reaction is finished, dealcoholizing, rectifying and separating to obtain high-purity propylene glycol n-methyl ether. According to the synthesis method disclosed by the invention, a multi-section temperature control technology is adopted for etherification reaction, so that the reaction temperature is increased by 5-10 DEG C section by section, high-temperature reaction is avoided, side reaction is effectively inhibited, 10-15% of by-product propylene glycol isomethyl ether is effectively reduced, and the conversion rate of propylene glycol n-methyl ether is increased to 97% or above.

This invention discloses an ultra-low reflectivity optical element and its fabrication method, comprising: S1, substrate pretreatment; S2, PVD vacuum evaporation sequentially depositing a SiO2 underlayer and an Al2O3 thin film; S3, hydrothermally treating the coated substrate in neutral pure water at 60-100℃ for 30-120 minutes to form a gradient refractive index porous structure in the Al2O3 thin film; S4, drying treatment. The resulting optical element comprises a substrate, a SiO2 underlayer, and an Al2O3 thin film layer. The Al2O3 thin film layer has a gradient refractive index porous structure with a continuous transition from high porosity at the surface to low porosity at the bottom, and an average reflectivity ≤0.1% in the wavelength range of 380-780nm. This invention features a simple and environmentally friendly process, is suitable for glass and plastic substrates, exhibits excellent film adhesion, and can be widely used in high-end optical equipment such as mobile phone lenses and automotive lenses.

The application discloses a glycerol / polyethylene glycol-based aspartic acid monoester amphoteric-nonionic surfactant and a preparation method thereof, and belongs to the technical field of special surfactants. The application takes maleic anhydride, a low-melting-point polyol with excellent mutual solubility and a primary aliphatic amine as raw materials, and prepares the target product through three steps of selective monoesterification, Michael addition and neutralization of acid-base equivalent, and can select a reaction atmosphere according to the material characteristics of the polyol. The application avoids the use of high-boiling-point solvents throughout the whole process, can realize directional monoester synthesis, and effectively solves the technical pain points of traditional aspartic acid ester products, such as disordered components, purification difficulty and limited industrial production. The product has the dual advantages of mild and low irritation of amphoteric surfactants and acid and alkali resistance and salt resistance of nonionic surfactants, and has the advantages of green and simple overall preparation process, adjustable performance and suitable scale industrial production, and has a wide application prospect in the fields of daily chemicals, medicines and industrial emulsification.

The utility model discloses a kind of zero-emission aviation parts cleaning machine, it is related to aviation cleaning equipment technical field.It includes liquid path system, electric control cabinet, cleaning tank, online detection module, oil-water separation device, solidification collection module;The online detection module is electrically connected with electric control cabinet, for real-time monitoring the oil content concentration in cleaning fluid, granularity, salinity and feedback to electric control cabinet;The oil-water separation device is connected with cleaning tank by recovery pipeline, for separating oiliness and moisture in waste liquid;The solidification collection module includes the oiliness solidification component connected with the oil-water separation device and with salt solidification component, respectively for solidification collection to the oiliness separated by the oil-water separation device and concentrated salt class.This utility model realizes the zero-emission of cleaning waste liquid, improves water resource utilization rate, and oil salt treatment is convenient, suitable for the environmental protection cleaning of aviation parts.

This invention discloses a high-functionality defatted rice bran, its preparation method, and its applications. The method includes: stabilizing fresh rice bran with saturated steam to inactivate lipase, obtaining stabilized rice bran; then using the stabilized rice bran as raw material, extracting and defatting it with supercritical CO2 to separate rice bran oil and high-functionality defatted rice bran. Preferably, the saturated steam treatment temperature is 115-125℃, and the time is 15-25 min; the supercritical CO2 extraction temperature is 45-55℃, the pressure is 25-35 MPa, and the time is 1.5-2.5 h. The defatted rice bran prepared by this invention has a fat content of less than 1.5%, a water-holding capacity of more than 3.0 g / g, an oil-holding capacity of more than 2.4 g / g, and an expansion potential of more than 5.8 g / g. This method is green and environmentally friendly, significantly improving the functional properties of defatted rice bran. The resulting product can be used as a high-dietary-fiber ingredient in baked goods, showing good application prospects.

This invention belongs to the field of engineered wood products technology, and relates to an E NF The preparation process of flame-retardant fiberboard includes: pre-dispersing a specific compounded powdered flame retardant in a modified urea-formaldehyde resin solution with a high melamine ratio during adhesive application, and then applying it to the fiber surface to achieve uniform coating of the flame retardant by the adhesive solution; and applying two UV-cured coatings to the surface of the hot-pressed board to form a sealed layer. The resulting fiberboard exhibits a stable formaldehyde emission level reaching E... NF The product achieves a flame retardant rating of B1 as specified in GB 8624-2012, while also possessing excellent internal bond strength, static bending strength, and low water absorption thickness swelling rate, resulting in consistent and stable product quality. This invention solves the challenge of simultaneously achieving environmental friendliness, flame retardancy, and mechanical properties in fiberboard through the synergistic application of three technologies. The use of UV-cured coating as a formaldehyde-sealing method is efficient and environmentally friendly, and the coating itself also enhances the surface wear resistance and scratch resistance of the board, increasing the product's added value.