39results about How to "Lower storage temperature" patented technology

The invention relates to a method for preparing a microporous polyurethane elastomer, in particular to a microporous polyurethane elastomer which is prepared through a foaming reaction that a chain extender containing a mixture of water, a high molecular weight polyalcohol, a catalyst and a foam stabilizer is stirred and blended into a mixed prepolymer prepared by stirring and blending a prepolymer containing a terminal isocyanate group and prepared by reacting a polyalcohol and 1,5-naphthalene-diisocyanate (NDI) and 3,3'-dimethyl-4,4'-diphenyldiisocyanate (TODI). The invention aims to improve the processability and the storage stability of the NDI and effectively reduce the cost of raw materials of the NDI while keeping the excellent performance of the NDI. The product prepared by the method is mainly used for bearing high-strength damping elements of dynamic fatigue, such as buffering and shock-absorbing elements of traffic tools, such as vehicles and the like, bridge shock-absorbing blocks and the like.

A portable cooler is provided that includes a base that supports a refrigeration unit. The base also supports a plurality of upwardly-extending support poles that accommodate a top portion. The support poles, top portion, and base define a food storage volume that is surrounded by a plurality of insulative walls.

The invention discloses a natural-defrosting refrigerator with a temperature changing function and a defrosting control method, and belongs to the technical field of refrigerators. The natural-defrosting refrigerator comprises a cooling system used for controlling the temperature of a refrigerating compartment and a temperature changing system used for controlling the temperature of the temperature changing compartment, wherein the refrigerating compartment and the temperature changing compartment are subjected to air supply refrigeration through an evaporator, and the two compartments share one set of refrigeration device for refrigeration, and the temperature requirements of each compartment of the refrigerator are realized by judging the temperature of the evaporator, the temperature ofthe refrigerating compartment and the temperature of the temperature changing compartment in real time and controlling opening and closing of the a refrigerating ventilation door, a temperature changing ventilation door and a compressor on a refrigerating system according to control logic preset by the system. According to the natural-defrosting refrigerator, a defrosting heater on the evaporatoris discarded, the production cost of the refrigerator is reduced, and the evaporator is naturally frosted through the operational characteristic of the refrigerating compartment above 0 DEG C, the normal operation of the refrigerator is ensured, at the same time the energy consumption for the operation of the refrigerator is reduced, and air heat and cool energy in the refrigerator are fully used.

The invention discloses an amino solar thermal chemical solid oxide electrolysis water hydrogen production system, which comprises a heliostat field, an ammonia decomposition reactor, a normal temperature pressure storage tank, an ammonia synthesis reactor and a solid oxide electrolysis cell, wherein a first liquid conveying pipe is connected to the bottom inlet of an ammonia decomposition reactor, a first gas conveying pipe is connected to the top outlet of the ammonia decomposition reactor, a second liquid conveying pipe is connected to the bottom outlet of the ammonia synthesis reactor, a second gas conveying pipe is connected to the top inlet of the ammonia synthesis reactor, the solid oxide electrolysis cell is connected to a water conveying pipeline, the water conveying pipeline penetrates through the ammonia synthesis reactor, and the heliostat field can heat the ammonia decomposition reactor. According to the present invention, the system solves the problems of low electrolysisefficiency, high electrolysis cost, high operating temperature and the like of the conventional electrolysis cell by using the advantages of high energy density, low energy loss and low storage temperature of the ammonia synthesis reaction.

The invention designs a method for storing dendrobium officinale for processing. The method comprises the following steps: picking fresh strips of dendrobium officinale; screening to obtain fresh strips of dendrobium officinale with a polysaccharide content greater than 30%, consistent length, no pests and diseases and no mechanical injuries; taking the screened fresh strips of dendrobium officinale; heating and drying at 70-80 DEG C for 1.5-2 hours; keeping the moisture of the fresh strips of dendrobium officinale at 65-80% and keeping the water activity at 0.5-0.65; taking out and cooling the fresh strips of dendrobium officinale to below 20 DEG C after reaching the corresponding water activity; placing the cooled dendrobium officinale for processing into a 0.3-05 thick corrugated box; placing a citral preservative at a mass ratio of 0.1-1%; sealing an opening and placing at an ice temperature of -5 to -2 DEG C for storage; and controlling the environmental humidity at 70-85%. The storage method designed in the invention adopts a comprehensive control technology of pre-controlling the water activity combined with plant essential oil to solve a storage problem of the dendrobium officinale for processing and relieve the production pressure of enterprises in a harvesting peak period.

The invention discloses an intelligent grain storage device, having a technical advantage of full-automatic air drying of grains. The structure of the intelligent grain storage device comprises a bin body, a storage bin arranged in the bin body, a bin top, a negative pressure delivery pump, a measuring bin and an exhaust hood, wherein an air-drying bin is arranged at any side wall of the bin top respectively, and consists of a feed port, a discharge port, a light absorbing plate and a transparent cover covering and locked on the light absorbing plate; the discharge port communicated with the storage bin; the measuring bin is arranged in the bin top; the upper end of the measuring bin is connected with the negative pressure delivery pump by virtue of an extraction opening provided with a filter screen; the bottom of the measuring bin is connected with a feed pipe communicating with a storage space of the bin body; a level meter is arranged in the measuring bin and is connected with the negative pressure delivery pump through a controller; the lower end of the measuring bin is provided with a material dividing port connected with the feed port of each air-drying bin respectively, and each material dividing port is provided with a material dividing valve respectively; and a draught fan is arranged in the exhaust hood which is arranged right above the bin top. The intelligent grain storage device disclosed by the invention can achieve intelligent air drying.

The invention relates to the technical field of a polymer material and chemical industry, in particular to a preparation method of frost resistance polyurethane glue, which is characterized in that: isocyanate or an isocyanate compound B, polyester polyol C with symmetrical structure, and a catalyst D are added into an organic solvent A for reaction for 2 to 5 hours at 50 and 100 DEG C; then a chain extendor E is added for reaction for 1 to 4 hours; the temperature is reduced to 35 to 60 DEG C; an organic solvent F of 10 to 25 percent is added for dilution to achieve solid content of 35 to 65 percent; a frost resistance modifier G is added for stirring; then 0 to 10 percent of other accessory ingredients are added for fully stirring; the temperature is reduced to be 20 to 35 DEG C; and then the mixture is filtered and packaged for obtaining the finished product. The adding amount of the frost resistance modifier G accounts for 0.01 to 10 percent of the weight of the finished frost resistance polyurethane glue system. Compared with the prior art, the preparation method of the frost resistance polyurethane glue can be used under a condition of minus15 DEG C to 5 DEG C, thus reducing the storage and use temperature of the glue, and therefore can be broadly applied to the industries of vehicles and furniture.

The low temperature refrigerator features that it has at least one of its compartments in the temperature not higher than -40 deg.c. When food is frozen, it begins to freeze at 0 deg.c and obtains greatest ice crystal volume at -4 deg.c, at which the ice crystal inside food is easy to piece cell membrane to cause nutrient loss. Therefore, raising the freezing speed to make food past the ice crystal temperature in shortest time can reach excellent freshness preventing effect. The present invention can raise the freshness degree of the frozen food.

The invention discloses a preparation method of fruit and vegetable composite probiotic powder. The method comprises the steps of material selection, screening, grinding, vibration screening, sterilization, total mixing, moisture detection, packaging and auxiliary equipment. The fruit and vegetable composite probiotic powder prepared by the method contains trace elements and probiotic strains in fruits and vegetables; the trace elements and probiotic strains required by a human body can be supplemented by eating a small amount of the fruit and vegetable composite probiotic powder, and especially for infants with small food intake and difficulty in digestion, the problem that the elements and probiotics need to be supplemented at the same time is more effectively solved; fruits, vegetablesand probiotics are made into powder, so that the limitation of the storage temperature and the storage time of the original product is reduced, and the product is convenient to carry and eat; a three-dimensional mixer is used for mixing the materials, so that the uniformity of the materials is improved, and the fruit and vegetable powder and the probiotic powder which are independently packaged are uniformly mixed.

The invention discloses a saccharification and yield-increasing process for high-solubility beer. The saccharification and yield-increasing process comprises the following steps: S1, selecting basic raw materials of water, malt, rice, hops and yeast of the beer; S2, processing of basic raw materials, namely crushing malt and rice; S3, saccharification: gradually decomposing insoluble high-molecular substances in the malt and the auxiliary materials into soluble low-molecular substances by utilizing various hydrolases contained in the malt under proper conditions (temperature, pH value and time); and S4, wort filtration: rapidly and thoroughly separating soluble extracts in the saccharified mash, reducing wheat bran polyphenols, pigments and bitter substances influencing beer flavor and preventing macromolecular proteins, fatty acids, beta-glucan and the like in malt from entering the wort, thereby ensuring good taste and clarification of the wort. The saccharification process is adjusted, which reduces macromolecular protein formation and increases beer yield by improving wort boiling strength and reducing post-storage temperature of the fermentation broth.

The invention relates to a method for preparing a microporous polyurethane elastomer, in particular to a microporous polyurethane elastomer which is prepared through a foaming reaction that a chain extender containing a mixture of water, a high molecular weight polyalcohol, a catalyst and a foam stabilizer is stirred and blended into a mixed prepolymer prepared by stirring and blending a prepolymer containing a terminal isocyanate group and prepared by reacting a polyalcohol and 1,5-naphthalene-diisocyanate (NDI) and 3,3'-dimethyl-4,4'-diphenyldiisocyanate (TODI). The invention aims to improve the processability and the storage stability of the NDI and effectively reduce the cost of raw materials of the NDI while keeping the excellent performance of the NDI. The product prepared by the method is mainly used for bearing high-strength damping elements of dynamic fatigue, such as buffering and shock-absorbing elements of traffic tools, such as vehicles and the like, bridge shock-absorbing blocks and the like.

The invention discloses an intelligent electric cooker with a refrigeration function. The intelligent electric cooker comprises a shell, wherein the top end of the outer surface wall of the shell is movably connected with a sealing cover through a connecting shaft, a thermal insulation board is fixed to the upper surface of the sealing board through bolts, a lifting handle is fixed to the upper surface of the thermal insulation board through bolts, an air outlet cover is embedded on the lower surface of the sealing cover, elastic rods are fixed to the bottom end of the inner surface wall of the shell through bolts, a heating plate is elastically connected to the upper surfaces of the elastic rods, a liner is embedded to the upper surface of the heating plate, and an AVR central controlleris fixed to the bottom end of the inside of the shell through bolts. For the intelligent electric cooker with the refrigeration function, through the generated low-temperature gas, the low-temperature storage for food in the liner is realized, thus the phenomenon of deterioration of the food is avoided, the preservation time of the food is prolonged, meanwhile, in match with a double buffer structure comprising air cushion layers and the elastic rods, the influences of the shaking on the electric cooker are reduced, thus the use safety and stability of the electric cooker are improved, and the practicability is strong.

The invention discloses an amino thermochemical energy storage reactor of a supercritical CO2 solar thermal power generation system. The amino thermochemical energy storage reactor of the supercritical CO2 solar thermal power generation system comprises an ammonia decomposition heat absorption reactor 3 arranged on a reflection light path of a heliostat field 1 reflecting sunlight; the ammonia decomposition heat absorption reactor 3 and a first heat exchanger 4 are erected on a heat collection tower 2, and the ammonia decomposition heat absorption reactor 3, the first heat exchanger 4 and a normal-temperature pressure storage tank 7 are sequentially connected through a first gas delivery pipe 5 and a first liquid delivery pipe 6. A normal-temperature pressure storage tank 7, a second heatexchanger 10 and a synthetic ammonia heat release reactor 11 are sequentially connected through a second gas delivery pipe 8 and a second liquid delivery pipe 9; a heat exchange circulation device which takes supercritical CO2 as a working medium is arranged between the synthetic ammonia heat release reactor 11 and a power plant 12.

The invention discloses a cooling polymer modified asphalt material which is characterized by comprising the following components in parts by weight: 55-65 parts of asphalt, 20-30 parts of sulfonic modified asphalt, 5-7 parts of a functional copolymer, 3-5 parts of micron powder and 1-3 parts of a coupling agent, wherein the functional copolymer is prepared from 3-[N,N-dimethyl[2-(2-methylprop-2-enoyloxy)ethyl]ammonium]propan-1-sulfonic acid inner salt, 2-acrylamide-2-methylpropanesulfonic acid, polyethylene glycol monoallyl ether and N-(4-cyano-3-trifluoromethylphenyl)methacrylamide through a copolymerization reaction. The invention also provides a preparation method of the cooling polymer modified asphalt material. The cooling polymer modified asphalt material provided by the invention is better in thermal stability, stronger in durability and ageing resistance, lower in storage and transportation temperature and longer in service life.

The present invention relates to a vehicle-mounted fruit and vegetable fresh-keeping box. The box comprises a box body and a box cover; the box body comprises a hollow vacuum layer, the inner wall ofthe box body is provided with a tube-mesh shell, and a gap for containing dry ice is reserved between the tube-mesh shell and the inner wall of the box body; the inner surface of the box cover is provided with a storage mesh basket, the storage mesh basket is filled therein with ethylene absorbent; and the box further comprises a sterilization mechanism, the sterilization mechanism comprises a liquid storage tank containing chlorine dioxide disinfectant and a plurality of atomizing nozzles arranged on the lower surface of the storage mesh basket at intervals, the spraying direction of each atomizing nozzle is vertically downward, the liquid storage tank communicates with the atomizing nozzles through a liquid discharging pipe, and the liquid discharging pipe is connected with a circulationboosting pump. Due to the presence of the atomizing nozzles, the mist-like chlorine dioxide disinfectant can kill microorganisms on the surface of fruits and vegetables, and due to the presence of dry ice, the storage temperature of fruits and vegetables is reduced, the oxygen concentration for the storage of fruits and vegetables is reduced, and the self-oxidation and respiration of fruits and vegetables are delayed; and due to the presence of the ethylene absorber, ethylene can be prevented from ripening fruits and vegetables.

The invention discloses a pork classification storage box. The pork classification storage box comprises a box body, a box cover, supporting legs and a storing plate, one side of the top of the box body is rotatably connected with the box cover through a hinge, a hollow cavity is formed in the outer wall of the box body, and ventilating holes penetrating through the box body are evenly formed in the inner side of the hollow cavity; and the storing plate is fixedly mounted on the side, close to the ventilating holes, of the inner wall of the box body through bolts, permeating holes are evenly formed in the surface of the storing plate, a miniature condenser is fixedly mounted on the outer sides of the supporting legs through the bolts, the output end of the miniature condenser is in threaded connection with an air guiding pipe, the end, away from the miniature condenser, of the air guiding pipe is in threaded connection with the side, close to the hollow cavity, of the box body, and theend, away from the miniature condenser, of the air guiding pipe penetrates through the hollow cavity. According to the pork classification storage box, the cold air in the hollow cavity is blown to the pork surface in a pork storage room through the ventilating holes, the storage temperature of the pork is reduced so as to prevent the pork deterioration, and the storage time of the pork is prolonged accordingly.

A method and apparatus for increasing the resistance of fruits to damage in their test and classifying procedure features that the temp of the fruits is lowered to the optimal cold storage temp, and a cooling unit is communicated via reflux tube, guide tube and throttle valve to the quality testing and classifying units for making their temp to be said optimal cold storage temp. As a result, the peel of fruit becomes harder and the respiration of fruit is reduced by 1-3 times.

The invention relates to the macromolecule material and chemical technical field, in particular to a preparation method of an improved polyurethane glue. The preparation method is characterized in that: an organic solvent A is heated to 35DEG C to 60DEG C, stirred at 600revolution / min to 1000revolution / min and added with polyurethane grains B gradually simultaneously; the addition of the added polyurethane grains B is 20 percent to 60 percent of the weight of the organic solvent, and then reaction is carried out for 5h to 10h; after the dissolution of the grains, an anti-freezing modifier C is added, stirred and mixed; according to needs, other auxiliary agents D are added, stirred and mixed fully, and the temperature is lowered to 20 DEG C to 35 DEG C; and the macromolecule material is obtained by filtering and packaging. The addition of the anti-freezing modifier accounts for 0.01 percent to 10 percent of a finished improved polyurethane glue system according to weight percentage. The beneficial results of the preparation method includes: the improved polyurethane glue can be utilized at 15 DEG C below zero to 5 DEG C, the temperature required in storage and utilization of a crystalline polyurethane glue is reduced, thereby being widely applicable to the industries of clothes, automobiles and furnitures, and bringing fortune to a broad range of users of a similar glue in freezing regions.

The invention provides a Brayton heat pump electricity storage system based on thermochemical energy storage, which comprises a refrigeration heat energy loop for generating cold energy and heat energy by means of electric energy; the heat storage unit corresponds to the refrigeration heat energy loop and is used for storing heat energy; the cold storage unit is arranged corresponding to the refrigeration heat energy loop, and the cold storage unit is used for storing cold energy; the regenerative heat exchanger is arranged corresponding to the heat storage unit and the cold storage unit; the regenerative heat exchanger is used for conducting heat exchange on heat energy lower than the target temperature on the heat storage side and cold energy higher than the target temperature on the cold storage side. And the cold and heat energy power generation loop is arranged corresponding to the heat storage unit and the cold storage unit, and the cold and heat energy power generation loop is suitable for absorbing heat energy in the heat storage unit and cold energy in the cold storage unit and generating power. Under different power utilization working conditions, cold and heat energy and electric energy are mutually converted, the cost is low, the energy storage density is high, the safety is high, the structure is compact, pollutants are not generated, and energy conservation and environment protection are achieved.

The invention belongs to the technical field of chemical equipment, and provides a tube-bundle tube-row type storage tank. The tube-bundle tube-row type storage tank comprises two pipe manifolds arranged in parallel. A plurality of pipe bundles are connected between opposite sides of the two pipe manifolds. Each pipe manifold comprises manifold heads at both ends and a plurality of manifold sections between the two manifold heads. Each manifold head is provided with a closure head. Each closure head is provided with a manhole. Each pipe bundle comprises a plurality of tube bundle segments which are sequentially connected from head to tail. Therefore, the storage tank has the advantages of simple manufacture and assemble, convenient transportation and adjustable volume of the storage tank,can be applied to the desert Gobi area with large storage liquid volume and vast area, and has low storage temperature, storage pressure, high safety and low production cost.

The invention discloses a method for realizing in-vitro preservation of cattleya germplasm resources and recovering the growth after the preservation. The method comprises the following steps: stripping a stem tip from a new growing pseudobulb, putting the stem tip on a surface of a protocorm induction culture medium and culturing to obtain a protocorm; carrying out repeated cutting and subculture on the protocorm, so as to reproduce the protocorms with the needed quantity; culturing by adopting an in-vitro preservation culture medium; after the protocorms enter a development and growth phase, culturing in a dark place at 0 to 5 DEG C; transferring the protocorms which are cultured in the dark place into a differentiation culture medium; differentiating the protocorms to generate seedlings. According to the method disclosed by the invention, a cattleya stem tip culture technology is utilized to induce the protocorms and the protocorms are differentiated to obtain the cattleya seedlings. The protocorms are preserved at low temperature and a proper amount of paclobutrazol is added, so that the preservation time can be greatly prolonged and the number of times of subculture is reduced; the hereditary properties of the germplasm resources are effectively kept. After the protocorms are preserved for certain time, the protocorms can be cultured at normal temprature and under illumination conditions, and the growth of the protocorms can be rapidly recovered and the seedlings are differentiated.

The invention discloses a fruit fresh-keeping device for Guanyang black plum selling. The device comprises a box body, a left bearing base and a right bearing base, a first short shaft and a second short shaft are mounted on one side of the right bearing base and one side of the left bearing base correspondingly, the end of the first short shaft and the end of the second short shaft are fixedly connected with two sides of the box body correspondingly, a protection cover is fixedly mounted on one side of the left bearing base, a self-locking driving mechanism is mounted in the protection cover,the output end of the self-locking driving mechanism is fixedly connected with one end of the second short shaft, and the input end of the self-locking driving mechanism is fixedly provided with a rocker rod. According to the device, the storage temperature of fruits can be reduced, meanwhile, humidifying can be provided for fruit storage space, water evaporation of the fruits can be reduced, thefresh-keeping effect of the fruits can be improved, a turnover structure is arranged, box turnover can be carried out, box body inversion is facilitated, maintaining of the bottom of the box body canbe facilitated, water can be conveniently added to a water absorbing sponge, and the water absorbing sponge can absorb enough water to be used for cooling and evaporating.

The invention discloses a controlled atmosphere low-temperature oil reservoir with a photovoltaic power generation system, for solving the problems that oil is short in normal storage time, easy to be oxidized and the like. A photovoltaic power generation device, a refrigeration device and an atmosphere controlling device act on the oil together so as to store up the oil. The oil reservoir comprises a solar battery panel, a bracket, a direct-current junction box, a grid-connected inverter, a grid-connected cabinet, a refrigeration system, a pump (a salt water pond) and a temperature reducing pipeline, wherein the photovoltaic power generation device enters the refrigeration device through a power grid to cool down the oil; the temperature reducing pipeline in the refrigeration system carries out circulation cooling through the external pump (the salt water pond). On the basis that the constant controlled atmosphere nitrogen charge storage is maintained and the oil is prevented from being oxidized, an oil tank can be refrigerated by converting solar energy into electric energy through photovoltaic power generation, the storage life of the oil is prolonged, and the green energy is effectively utilized.

The invention discloses a normal-temperature boar sperm diluent based on chlorpromazine and a low-temperature boar sperm diluent based on chlorpromazine and Chinese softshell turtle yolk. The in-vitrostorage temperature of boar sperm can be decreased to 10 DE C, preferably 12 DEG C by the normal-temperature diluent. The temperature of sperm stored at low temperature can be decreased to 4 DEG C, preferably 6 DEG C. Histological analysis proves that the integrity of acrosome of sperm stored at reduced temperature is obviously better than that of acrosome stored at normal temperature.

The invention discloses a controlled atmosphere low-temperature oil reservoir with a photovoltaic power generation system, for solving the problems that oil is short in normal storage time, easy to be oxidized and the like. A photovoltaic power generation device, a refrigeration device and an atmosphere controlling device act on the oil together so as to store up the oil. The oil reservoir comprises a solar battery panel, a bracket, a direct-current junction box, a grid-connected inverter, a grid-connected cabinet, a refrigeration system, a pump (a salt water pond) and a temperature reducing pipeline, wherein the photovoltaic power generation device enters the refrigeration device through a power grid to cool down the oil; the temperature reducing pipeline in the refrigeration system carries out circulation cooling through the external pump (the salt water pond). On the basis that the constant controlled atmosphere nitrogen charge storage is maintained and the oil is prevented from being oxidized, an oil tank can be refrigerated by converting solar energy into electric energy through photovoltaic power generation, the storage life of the oil is prolonged, and the green energy is effectively utilized.

The invention discloses a bendamustine hydrochloride freeze-dried powder injection. The freeze-dried liquid medicine is prepared from the following raw materials: 1 to 2 parts of bendamustine hydrochloride, 2 to 3 parts of freeze-dried excipients, 14 to 50 parts of organic solvents and 45 to 83 parts of water. The use of organic solvent formulations, low-temperature liquids, filling and freeze-drying techniques can effectively control the level of impurities in products.

The invention discloses a fresh-keeping packaging technology for red bayberries. The fresh-keeping packaging technology includes the steps of draining freshly picked red bayberries for 1 hour, then pre-cooling the red bayberries in an air-cooled refrigerator for 24 hours at 0-2 DEG C, and decreasing the central temperature of the red bayberries to 2 DEG C; soaking the red bayberries for 15 minutesin a 100 ppm chlorine dioxide solution, rinsing the red bayberries with clear water for 5 minutes, soaking the red bayberries with a mixed solution containing 25% VC and 0.5% citric acid for 10 minutes, draining water, and controlling the soaking solution at 0-4 DEG C; filling boxes with the red bayberries when their surfaces are free of water completely, and performing modified atmosphere packaging. The fresh-keeping packaging technology for red bayberries has the advantages that the length for preservation is prolonged from 15 days to 3 months, and the appearance, color and taste of the redbayberries are not lost.

The invention discloses an environment-friendly foam extinguishing agent. The extinguishing agent is prepared from raw materials in percentage by mass as follows: 15%-19% of a foaming agent, 0.2%-0.5%of xanthan gum, 2%-5% of an anti-freezing agent, 0.2%-0.6% of a fluorocarbon surfactant and 75%-82% of water. The invention also discloses a preparation method of the environment-friendly foam extinguishing agent. The method comprises the steps as follows: (1) adding water to a reactor, and adding xanthan gum and diethylene glycol to be dissolved; (2) adding urea and keeping stirring for dissolution; (3) adding the fluorocarbon surfactant and keeping stirring; (4) adding cellulose acetate butyrate and azodicarbonamide potassium formate, and performing stirring for 1 h to finish preparation. The environment-friendly foam extinguishing agent can form films with uniform thickness during usage and has high covering capacity.