307results about How to "Oxygen isolation" patented technology

The invention discloses a low-smoke non-halogen high-flameproof elastic polyolefin wire and cable plastic, which comprises the following parts: 40-80% EVA elastics (ethene-vinyl acetate copolymer), 20-50% POE elastics (ethene-hexaethene copolymer), 5-15% EMA elastics (ethene-methyl acrylate copolymer), 30-70% magnesium hydroxide or aluminium hydroxide, 20-40% nanometer magnesium hydroxide, 0.1-0.6% DCP (peroxide diisopropyl benzene), wherein the hardness is not more than 85 A with strength not less than 9.0Mpa and extending rate not less than 150%; the flameproof property reaches UL1581 VW-1, which is excellent flexible macromolecular mixing material.

The invention discloses water-based environment-friendly porcelain glaze-like plastic coating and a preparation method thereof. The water-based environment-friendly porcelain glaze-like plastic coating adopts a formula comprising the following materials by mass: 20 to 40 percent of a water-based acrylic emulsion, 10 to 20 percent of water-based silica sol, 35 to 50 percent of water-based inorganic silicon dioxide nanodispersion, 0.1 to 0.3 percent of a wetting dispersant, 1 to 5 percent of silane, 0.1 to 0.5 percent of an amine neutralizing agent, 5 to 10 percent of lead-free pigment, 0.5 to 2.5 percent of a film-forming additive, and 5 to 25 percent of deionized water. The water-based environment-friendly porcelain glaze-like plastic coating can be coated on the surfaces of various materials in the form of porcelain glaze, and can be applied on the surfaces of the materials of various shapes through roller-applied coating, shower coating, spraying, blade coating, brush coating, dip coating and the like; moreover, the formed porcelain glaze coating is unique and free from hydrolysis, and cannot be melted at a certain temperature, so that a base material can be effectively protected from corrosion, abrasion, scraping, acid-alkali, impact, inflaming and fire.

The present invention discloses probiotics enriched crisp apple products and a preparation method thereof, and belongs to the technical field of agricultural product processing. Apples are used as raw materials, the apples are washed, the washed apples are blanched, a vacuum soaking method is used to enrich probiotics into apple tissues, and then a vacuum freeze-drying and vacuum microwave combined drying method is used to prepare the probiotics enriched crisp apple products. The method comprises the following steps: (1) raw material washing and blanching; (2) probiotic soaking liquid preparing; (3) vacuum soaking; and (4) vacuum freeze-drying and vacuum microwave combined drying. The prepared probiotics enriched fruit and vegetable crisp products are mellow in fruit fragrance, and crisp and tasty. The viable probiotic number can be maintained at 10<7> CFU / g at 25 DEG C for 90 days or more. The preparation method avoids the two major defects of high cholesterol risk of the probiotic fermented milk products and the non-consumption of lactose intolerant population, and the products combine health care and leisure, and have broad market prospects.

The invention relates to a packaging adhesive film for a solar cell, which can effectively prolong scorch time T2 and improve the processing and packaging properties of an EVA adhesive film on the basis of small change on total cross-linking time TC. The packaging adhesive film for the solar cell contains a copolymer of ethylene-vinyl acetate (EVA), a cross-linking agent, a cross-linking inhibitor and a radical trap, wherein, the masses of the cross-linking inhibitor and the radical trap are respectively 0.1-1.0% and 0-0.3% of the mass of the ethylene-vinyl acetate copolymer, and the cross-linking time of the packaging adhesive film for the solar cell is 10-30min. In the invention, the cross-linking inhibitor and the radical trap are added based on the formula of the existing packaging adhesive film for the solar cell to form a stable molecular structure with active radicals generated in the peroxide cross-linking agent, thus effectively preventing early-stage cross-linking and over cross-linking, and effectively prolonging the scorch time T2 on the basis of guaranteeing the total cross-linking time TC to meet the requirements.

The invention discloses a self-punching riveting device of an ultrahigh strength steel plate and an aluminum alloy plate. The problem that in the prior art, under the premise that the mechanical property of the ultrahigh strength steel plate cannot be guaranteed, connecting of ultrahigh strength steel plate and aluminum alloy is achieved is solved. The self-punching riveting device of the ultrahigh strength steel plate and the aluminum alloy plate comprises a composite punch (1), a punch side pressing ring (22) and a composite concave die (14). The composite punch (1) comprises a first cooling gas pipeline (2) and a punch body (5). The composite side pressing ring (22) comprises a side pressing ring body (23). The composite side pressing ring (22) and the composite concave die (14) are arranged oppositely in an overlaying mode. The bottom face of the side pressing ring body (23) and the top end face of a concave die body (15) in the composite concave die (14) are in contact connection. The composite punch (1) is placed in a center hole of the side pressing ring body (23) and is in sliding connection. The rotation axes of the composite side pressing ring (22), the composite punch (1) and the composite concave die (14) are collinear.

The invention relates to a preparation method for polyphenylene sulfide fiber filter material resisting instant high-temperature oxidization. The preparation method is characterized in that a three-layer polyphenylene sulfide fiber structure made by non-weaving technology is used as a filtering material blank, is in padding by instant high-temperature oxidization resistant finishing liquor mainlyconsisting of polytetrafluoroethylene emulsion and epoxy phenolic resin, and then is in low-temperature antimigrant preliminary drying and high-temperature crosslinking curing, so that a membrane structure uniformly distributed with polytetrafluoroethylene particles in a scattered manner is completely wrapped on the surfaces of fibers of the filtering material, oxygen is isolated from the fibers,breaking strength retention rate of the prepared filtering material at the high instant working temperature ranges from 98% to 110%, both water repellency grade and oil repellency grade are remarkably increased, the filtering material is not easy to be damaged, easy to clean and free of being caked, burning of a filtering bag is prevented, differential pressure of a dust removal system is low, the service life of the filtering bag is prolonged, and the filtering bag can be widely used for high-temperature smoke dust removal filtering for iron and steel, power generation, cement, coal-fired boilers and the like. In addition, existing production equipment can be directly used in the method, a process is simple, and production cost is low.

The invention discloses a fuel-cell bipolar plate with a nitrified and enhanced surface and a preparation method thereof and belongs to the technical field of fuel cells. The bipolar plate is prepared by the following steps of: preparing a nitrified layer, a chromium-nitride thin film and a carbon-based nano composite conductive thin film on the two side surfaces of a matrix of a stainless-steel plate or a titanium-alloy plate in sequence, cleaning and drying the matrix of the stainless-steel plate or the titanium-alloy plate, then putting the matrix in vacuum-arc ion-plating equipment, introducing nitrogen and hydrogen under the vacuum condition, starting bias voltage and hot wires, and preparing the nitrified layer; and introducing argon-nitrogen mixed gas, preparing the chromium-nitride thin film, opening a carbon target and preparing the carbon-based nano composite conductive thin film. The fuel-cell bipolar plate disclosed by the invention has the advantages that an ion nitrification technology is introduced into the field of surface modification of the fuel-cell bipolar plate, and the nitrified layer is prepared on the surface, so that the passivation of the matrix can be avoided, the condition that a coating fails due to corrosion can be effectively prevented; and a stepped transition method is adopted for multi-element composition of the chromium-nitride thin film and the nano composite conductive thin film, so that the peeling of the coating in the use process due to overlarge internal stress and oversmall bonding force is prevented.

The invention discloses a pseudosciaena crocea ice temperature fresh-keeping method, which comprises the steps of: ice spreading box loading, ice water cleaning, fluidized ozone ice pre-cooling, heat insulation box loading and ice temperature storage. The ozone ice and the fluidized ozone ice are sequentially adopted, the dual effects of lowering the fish body temperature and inhibiting the germ propagation are realized, further, the ice temperature storage is adopted, the freezing of the pseudosciaena crocea in the storage process is avoided, the original flavor and the fresh degree of the pseudosciaena crocea are more perfectly maintained, the quality guarantee period of the pseudosciaena crocea is greatly prolonged, and the pseudosciaena crocea is still fresh after being stored for 21 days.

The invention discloses a method for making dry white wine through red grape varieties. The method is characterized by comprising the process steps of determining of the grape picking period, harvesting of grapes, ear-by-ear selection, peduncle removal, grain-by-grain selection, crushing, low-temperature juice taking, low-temperature clarification, juice separation and temperature increasing, low-temperature alcohol fermentation, tank transferring, ageing or storage, fining, freezing, sterilization, filling and the like. In this way, the produced dry white wine is pale yellow or straw yellow in color, clarified, transparent and glossy. The dry white wine has the pure, active, elegant, fresh and rich fruit aroma; the wine after ageing also has complicated and rich ageing fragrance, and is soft in mouthfeel, fresh, tasty and refreshing.

The invention relates to the technical field of fuel cells, and provides a high-performance bipolar plate with a graphene-reinforced surface for a fuel cell and a preparation method of the high-performance bipolar plate. A titanium bipolar plate is adopted as a substrate, and by adopting magnetron sputtering apparatus and method, a nickel layer or nickel-chromium layer, a first gold layer, a first graphene layer, a second gold layer and a second graphene layer are sequentially deposited on the surface of the self-sputtered and cleaned titanium bipolar plate substrate. The nickel layer or nickel-chromium layer, the first gold layer and the second gold layer which are few in pore defects and uniform in thickness can be prepared; the binding force between the first gold layer and the titanium bipolar plate substrate is improved by using the nickel layer or nickel-chromium layer, so that the problems of reducing the total contact resistance and improving the corrosion resistance of the titanium bipolar plate in the using process are solved; oxygen around the nickel layer or nickel-chromium layer, the titanium bipolar plate substrate and a cathode can be isolated by using the gold layer, so that oxidation of the nickel layer or nickel-chromium layer and the titanium bipolar plate substrate is avoided; and by adopting the graphene layers, the surfaces of the gold layers have high hydrophobicity and the separated carbon particles in the preparation process of graphene have a good pore blocking effect.

The invention is used for non salt inflaming retarding system in preparation of PBT project plastics and a PBT complex materials and a preparation method thereof, belonging to a macromolecule material field. The PBT complex material is prepared by both drawing PBT resin, glass fiber, and toughener together with matching two components of A and B into a double screw extruder, extruding, cooling and particle slicing; wherein, A component is master batch prepared by mixing organic rare-earth organic phosphate salt nucleating agent,an antioxygen agent, an exterior lubricant and polyethylene; B component is non salt inflaming retarding system formed by mixing and matching three organic phosphonate (salt) according to a ratio of 2:1:1. The non salt inflaming retarding system of the invention has fine heat resistant, hydrolyzation resistant and inflaming retarding performance; products prepared by adding the inflaming retarding system has the advantages of excellent comprehensive performance, and being provided with environmental friendly, environment cross bonding matter content meeting European Union RoHS standard and being suitable to electronic electric equipment products.

The invention discloses a graphene modified silicone rubber cable sheath material. The material is prepared from raw materials as follows: phenyl siloxane rubber, methyl vinyl silicone rubber, fluororubber, polybutadiene rubber, polyurethane, ethylene-acrylate rubber, zinc oxide, stearic acid, 2,4-dichlorobenzoyl peroxide, an assistant crosslinker TAIC, 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, cerium oxide, fumed silica, carbon black, nano calcium carbonate, stearic acid modified magnesium hydroxide, ammonium polyphosphate, modified graphene oxide, nano silicon carbide, magnesium stearate, triphenyl phosphate, tributyl citrate, an accelerator, an anti-aging agent and silane modified cellulose. The graphene modified silicone rubber cable sheath material is high in strength, excellent in heat resistance and flame retardation, good in aging resistance and long in service life.

The invention relates to the technical field of food processing, in particular to a preparation method of zein-bee pollen extract microcapsules. According to the specific technical scheme, the preparation method comprises the following steps of taking a bee pollen extract as a core, taking zein as a shell, adding the bee pollen extract to a zein solution, performing ultrasonic dissolving, and performing dispersing so as to obtain a zein-bee pollen extract solution; and then performing granulation by an electrostatic spraying method so as to obtain the zein-bee pollen extract microcapsules. Through the preparation method disclosed by the invention, the problems that in the prior art, effective components cannot be released in the intestines and the stomach, prepared microcapsules are unevenin granules, and the encapsulation efficiency is low are solved.

The invention discloses an imitation aluminum wiredrawing composition membrane comprising a PET (Polyether) membrane layer, an adhesive layer, a PVC (Polyvinyl Chloride) membrane layer and a wiredrawing aluminum foil layer. The composition membrane is characterized in that: the PET membrane layer is adhered to a wiredrawing surface of the wiredrawing aluminum foil layer through the adhesive layer and the PVC membrane layer is adhered to a non-wiredrawing surface through the adhesive layer. In the other technical scheme, the PET membrane layer is used for replacing the PVC membrane layer. The imitation aluminum wiredrawing composition membrane has the metallic luster and the wiredrawing texture of wiredrawing aluminum materials; meanwhile, the wiredrawing aluminum foil layer is located between the PET membrane layer and the PVC membrane layer, so that the oxygen gas can be isolated, the oxidization is prevented and the metallic luster and the wiredrawing effect of a wiredrawing aluminum foil are kept for a long time; the imitation aluminum wiredrawing composition membrane can be further compounded on surfaces of cold-rolled sheets, aluminum sheets, zinc-plated sheets and building materials to have the decorative, protective and beautiful functions; and the composition membrane has the advantages of simple process, convenience for operation and low cost.

The invention discloses an extrusion die which comprises a die face and a die cushion. The extrusion die is characterized in that the die cushion comprises a die hole, a die hole acting layer and a cooling interlayer; a die working belt, a gas guide groove and a gas inlet hole are arranged in the die face; and inert gas enters the extrusion die from the gas inlet hole of the die face and flows into the die working belt through the gas guide groove. According to the extrusion die, aluminum oxide particles can be effectively prevented from being generated, the product yield is increased, and meanwhile die losses are reduced.

The invention relates to the technical field of flame retardants, in particular to a halogen-free intumescent flame retardant and a preparation method thereof. The halogen-free intumescent flame retardant is prepared from the following raw materials: a melamine derivative, coated ammonium polyphosphate, a triazine derivative, pentaerythritol phosphate, trihydroxyethyl isocyanurate, organic silsesquioxane, nano-silica, a synergistic flame retardant, a smoke suppression agent, a char-forming accelerant, a coupling agent, an antioxidant and a lubricating agent. The intumescent flame retardant hasa good flame-retarding effect and less additive amount, the impact on the physical and mechanical properties of plastics can be reduced to the greatest extent, and the advantages of non-halogen, low-smoke, low-toxicity, anti-melting dropping and non-corrosive gas are achieved; and a dense porous foam carbon layer is formed on the surface of material during combustion, the further degradation of inner layer high polymers and the release of combustible material to the surface can be prevented, and the transfer of a heat source to the high polymers can be prevented and an oxygen source is isolated, so that the spread and propagation of flames are prevented.

The invention provides an anti-blue-ray quantum dot membrane and a preparation method thereof. The anti-blue-ray quantum dot membrane prepared by the method is capable of using a high-molecular polymer as a base material, through homogeneous dispersion and compounding of quantum dots in a certain proportion and concentration, curing and forming; the quantum dots dispersed in the membrane absorb ablue ray and are excited by the blue ray, and photochemistry down-conversion is realized; and an anti-blue-ray technical effect is finally realized. The quantum dot membrane is a transparent materialas a whole, and comprises a light conversion layer and a protecting layer covering the exterior of the light conversion layer. The quantum dots are uniformly distributed in the light conversion layer.

The invention discloses a method for utilizing a plasma spray scalded wear-resistant coating. The method for utilizing the plasma spray scalded wear-resistant coating is characterized in that Fe+B4C+Ti+W+C+WC are taken as raw materials, Ar and N2 are taken as gas media, in situ reaction is carried out on the surface of a pretreated workpiece under the heating action of a plasma beam heat source, and a wear-resistant boss coating in a scalded shape is formed, wherein height of a wear-resistant boss is 3-5mm, and diameter of the wear-resistant boss is 10-15mm. The method for utilizing the plasma spray scalded wear-resistant coating has the advantages that a rapid melting and solidification transition region is formed between a metal ceramic coating and a matrix, hardness of the rapid melting and solidification transition region is between the hardness of the metal ceramic coating and the hardness of the matrix, and a binding force of the metal ceramic coating and the matrix can be beneficially improved; a wear-resistant boss coating surface structural form distributed in the scalded shape is formed on the surface of a workpiece, the tendency that cracks appear in the coating due to different alloy contraction ratios can be reduced, and peeling of large-area coating can be greatly inhibited.

The invention discloses linagliptin particles and a preparation method thereof. Linagliptin is used for treating type 2 diebetes. At present, only linagliptin tablets are sold on the market. Aiming at dysphagia patients, compared with the above two dosage forms, the linagliptin particles have obvious advantages and can improve drug compliance of patients.

The invention relates to a water mist fire extinguishing addictive. It characterizes in that 3.0%-6.0%(by weight) fluorine surfactant, 67.45%-80.25%(by weight) water, 0.25%-0.5%(by weight) triethanal amine ,4.0%-6.5%(by weight) urea, 1.0%-1.5%(by weight) sodium lactate, 1.5%-3.0%(by weight) alkylphenol polyoxyethylene are added to 10.0% to 15.0%(by weight) N-N-dimethylformamide, then PH of which be regulated between 7.5 to 8.5 by acetic acid or sodium hydroxide after it dissolved completely. Filtering the solution to get the concentrated solution of the water mist fire extinguishing addictive of the present invention. Water should be added to dilute the solution to lower the fluorine surfactant content down to 0.2% to 0.8% in use.

The invention discloses a preparation method of low-peroxide-value coated peanuts. The invention belongs to the field of peanut foodstuff processing. The preparation method comprises the steps of: (1) coating, (2) vacuum far-infrared baking, (3) cooling, (4) edible film coating, and (5) vacuum far-infrared baking. With the five steps, baking quality consistency of the coated peanuts is ensured, and oxygen and water are effectively isolated. Therefore, a guarantee period, a shelf life and a product exportation time limit are effectively prolonged, and substantial economic benefits are provided.

The invention discloses water-soluble quercetin nanometer particles and a preparation method thereof. The preparation method comprises the following steps: firstly, enabling wheat protein to be uniformly dispersed in deionized water, performing heating, adjusting the pH value, adding trypsin, performing enzymolysis, performing enzyme deactivation, and performing dialysis so as to obtain wheat protein zymolyte; then, selecting an organic solvent for compounding quercetin mother liquid; enabling the wheat protein hydrolyzate to dissolve in a PBS solution; dropwise adding the quercetin mother liquid in the wheat protein hydrolyzate solution, and performing centrifugation so as to obtain a wheat protein hydrolyzate-quercetin nanometer particle solution; and performing freeze-drying so as to obtain the water-soluble quercetin nanometer particles. According to the water-soluble quercetin nanometer particles and the preparation method thereof disclosed by the invention, the water-soluble quercetin nanometer particles are prepared through the non-covalence interaction between the wheat protein hydrolysate and quercetin. The water-soluble quercetin nanometer particle products are good in solubility, small in particle diameter, high in load rate and stable in chemical stability and colloid stability, the processing stability of the quercetin is greatly improved, and the water-soluble quercetin nanometer particles can be applied as food ingredients.

The invention discloses a three-dimensional space firefighting command controlling system. The system is characterized in that a positioner and a firefighter data terminal are worn by a firefighter, a backfield data terminal and a backfield host connected with the backfield data terminal in a wireless manner are arranged at an on-site command position, the positioner calculates a positioning result of the firefighter, transmits the result to the firefighter data terminal, and sends data to the backfield data terminal through the firefighter data terminal, and the backfield host receives the data from the backfield data terminal and displays real-time position and track of the firefighter. According to the system, a holographic three-dimensional space model is constructed by employing the GIS technology, the VR technology is employed, two-group, two-dimensional and real-scene three-dimensional seamless integration in a fire scene range can be realized, the positioning of positions and movement tracks of the firefighters in the fire scene space can be realized by employing a VR+ data terminal, the entire time-space and multi-dimensional system with high space precision is constructed, and the safety of the firefighters is guaranteed in an omnibearing manner.

The invention relates to a large-scale production method of a plant indigo dye for garment dyeing. The plant indigo dye is used in the large-scale production method of garments, nitrogen is filled into a garment dyeing device to remove the air, or the garment dyeing device is vacuumed to form minus 0.05-minus 0.07MPa negative pressure, the garments are then dyed with the plant indigo dye in the garment dyeing device, the dyeing temperature is 26-70DEG C, and the dyeing time is 50-150 minutes. By the arrangement, the problem that the plant indigo dye cannot be applied to a modern garment dyeingmachine on a large scale can be solved, and dyeing times are greatly reduced from traditional 6-18 times repeated dyeing to 1-3 times; the dyeing temperature can be raised so as to improve dye-uptake, level-dyeing property and dye permeability, and the color fastness of dry and wet friction and light resistance of the plant indigo dye are improved.

The invention discloses a smokeless smellless inorganic nano high-temperature-resistant corrosion-resistant wear-resistant paint and a preparation method thereof. The wear-resistant paint comprises an inorganic nano resin and a mixed solvent, wherein the inorganic nano resin is prepared from the following components in percentage by weight: 30-90% of silicon dioxide, 10-70% of silane, 0.1-10% of pH value regulator and 0.01-1% of accelerator HMT (hexamethylenetetramine); and the mixed solvent is prepared from high-temperature-resistant environment-friendly pigment, filler, ethanol and water. The preparation method comprises the following steps: mixing the nano silicon dioxide dispersion with different particle sizes, adding the pH regulator and mixed silanes, carrying out thermostatic reaction, adding the metered accelerator HMT, and keeping the temperature to react, thereby obtaining the inorganic nano resin; and mixing the prepared inorganic nano resin and the mixed solvent, dispersing with a high-speed dispersion machine at high speed, and grinding to obtain the smokeless smellless inorganic nano high-temperature-resistant corrosion-resistant wear-resistant paint. The smokeless smellless inorganic nano high-temperature-resistant corrosion-resistant wear-resistant paint is smokeless, smellless and environment-friendly, does not discolor, has high wear resistance, and has favorable functions of corrosion resistance and rust prevention.

The invention belongs to the field of chemical materials, and particularly relates to a concentrated high-efficient fire extinguishing agent and a preparation method thereof. The concentrated high-efficient fire extinguishing agent is prepared from the following raw materials: urea, ammonium chloride, ammonium sulfate, sodium bicarbonate, potassium carbonate, a sodium silicate gel solution, ethylene glycol, ammonium polyphosphate, a surfactant, a foaming agent and water. The fire extinguishing agent is fewer in raw materials, low in cost, high in fire extinguishing grade, wide in application range and good in anti-reflash performance; the fire extinguishing agent is low in freezing point, so that the freezing point is applicable to the low-temperature environment of the northeast area; the fire extinguishing agent is concentrated, and before use, the fire extinguishing agent is mixed with water according to a ratio of 1:16 and can extinguish fires of 2A and 89B, so that the fire extinguishing agent occupies small space when being stored conventionally; and the fire extinguishing agent is soluble in water, so that a uniform solution state can be reached immediately after the fire extinguishing agent is mixed with water.

The invention relates to a transformer. The transformer comprises a coil frame wound with a coil, and a magnetic core placed in a central through hole of the coil frame, and also comprises a transformer shell and a rain groove connected with the top end of the transformer shell; ventilating openings are formed in the side wall of the transformer shell; a gasbag is horizontally connected in the side wall of the transformer shell, and the gasbag is connected with the rain groove; an oil storage tank matched with the gasbag is also included in the transformer shell; the oil storage tank is connected with an oil inlet of the oil immersed transformer; a piston is vertically and glidingly matched with the inner wall of the oil storage tank; and the piston is in contact with the gasbag through apush rod. By adoption of the scheme, corresponding emergency processing can be performed on the oil immersed transformer, so that the oil immersed transformer can perform normal and stable operation;and in addition, manual refueling in a rainy day is not needed, so that labor intensity is lowered.

The invention discloses a freshness-keeping agent used for fresh-cut apples and a preparation method thereof. The freshness-keeping agent used for the fresh-cut apples is composed of a first preservative and a second preservative; the first preservative comprises the following ingredients: a garlic extract, a vitamin C, beta-cyclodextrin, a mulberry leaf extract, and a buffer solution; the secondpreservative comprises the following ingredients: chitin and derivatives thereof, sodium alginate, lysozyme, and water. The preparation method of the freshness-keeping agent comprises the following steps: preparing the mulberry leaf extract; and preparing the first preservative; and then, preparing the second preservative. Allicin in the garlic extract has broad bacterium-resisting spectrum and strong bacterium-inhibiting activity; the added vitamin C, beta-cyclodextrin and buffer solution are capable of enhancing stability of the allicin; the mulberry leaf extract has anti-oxidation and preservation effects; and the lysozyme wrapped between the sodium alginate and the chitin and the derivatives thereof is slowly released so as to have freshness-keeping period of the freshness-keeping agent prolonged. The freshness-keeping agent used for the fresh-cut apples disclosed by the invention has very good preservation effects.

The invention provides a method for preparing low-smoke and high flame retardant powdered butadiene styrene rubber with the maximum smoke density less than 170 and the oxygen index greater than 39%. Allyl halogen and polar monomers are adopted in the invention to separately modify styrene-butadiene latex through graft polymerization. Then, a smoke inhibitor is treated through esterification reaction. Finally, the functionalized smoke inhibitor and the graft modified styrene-butadiene latex are mixed to directly agglomerate into powder. According to the invention, not only the flame retardant groups can be effectively embedded into the backbone of the powdered butadiene styrene rubber polymer, but also the compatibility between the smoke inhibitor and the styrene-butadiene latex is greatly improved, and problems that the smoke inhibitor disperses non-uniformly in the rubber matrix and is easy to migrate and precipitate and the like are overcome, and thus the powdered butadiene styrene rubber is endowed with characteristics of low smoke and efficient flame retardance.

The invention discloses a high-temperature-resistant and fire-resistant exterior wall panel, which comprises a base layer, a fire-resistant insulation layer, a plastering mortar layer, a waterproof layer, a decorative coating and a wear-resistant layer arranged sequentially from the inside to the outside; Parts include: 27-30 parts of hydroquinone, 11-14 parts of hexachlorocyclotriphosphazene, 18-22 parts of polyoxypropylene glycol, 65-70 parts of isophorone diisocyanate, trimethylpentanediol 50-60 parts, 3-4 parts of glucose, 0.3-0.6 parts of organic bismuth catalyst DY-20, 25-35 parts of foaming agent, 9-12 parts of foaming aid, 19-22 parts of palygorskite, 13 parts of dolomite ~16 parts, diatomite 6-9 parts, glass fiber 5-8 parts, straw silk 12-15 parts, magnesium hydroxide 16-19 parts, anti-aging agent 2-3 parts. The high-temperature-resistant fire-proof exterior wall panel proposed by the invention has excellent high-temperature resistance and fire-proof performance, excellent water resistance, high hardness and good compression resistance.