120 results about "Foam polyurethanes" patented technology

The invention relates to the technical field of polyurethane foam, and discloses fireproof flame-retardant foaming polyurethane and a preparation method thereof.The foaming polyurethane comprises a component A and a component B. The component A comprises, by weight, 100 parts of polyether polyol, 25-50 parts of a flame-retardant chain extender and the like; and the component B is 62-86 parts by weight of an isocyanate compound. The flame-retardant chain extender contains a plurality of polymerization sites, so that the crosslinking density of a polyurethane molecular chain is improved, a stable crosslinking network is formed, and meanwhile, the flame-retardant chain extender contains a siloxane structural unit with structural stability, so that the foamed polyurethane has higher compression strength. The flame-retardant chain extender contains a phosphate flame-retardant group, and forms a phosphorus-silicon flame-retardant system with a siloxane structure, so that the combustion heat release rate peak value, the total heat release amount and the total smoke release amount of foam are reduced, and the flame-retardant chain extender has good fireproof and flame-retardant properties.

The invention relates to the field of new energy batteries, in particular to a negative electrode current collector and a preparation method thereof, a pole piece and a battery, and the preparation method comprises the following steps: preparing a carbon nanotube with a hydroxyl group on the surface; mixing a carbon nanotube with hydroxyl on the surface, an isocyanate raw material, diol, water and a second organic solvent, and carrying out heating reflux treatment to obtain a third product; mixing the third product, a polytetrahydrofuran raw material, a second organic solvent and a second ammonium salt, and carrying out a polymerization reaction to obtain a precipitate; carrying out drying treatment on the precipitate, so as to obtain foam polyurethane modified by the carbon nano tube; and taking the foam polyurethane modified by the carbon nano tube as a working electrode, carrying out deposition reaction on the working electrode to obtain a base material with a metal layer deposited on the surface, and washing and drying the base material with the metal layer deposited on the surface. The negative electrode current collector lithium metal battery provided by the invention has relatively large energy density, relatively small battery internal resistance, relatively strong cycle performance and relatively low safety risk.

The invention relates to high-strength all-water-blown polyurethane foam and a preparation method thereof. The high-strength all-water-blown polyurethane foam comprises the following components in parts by weight: a polyol composite material: 100 parts of polyether polyol, 2-8 parts of water, 0.5-3 parts of an amine catalyst, 0.2-2 parts of a gel catalyst, 1-5 parts of an organosilicon surfactant, 3-8 parts of a composite filler and 0-10 parts of an auxiliary agent; wherein the composite filler is formed by coating the surfaces of glass beads with porous nano silicon dioxide; the isocyanate material is an MDI (Diphenyl Diisocyanate) or TDI (Toluene Diisocyanate) prepolymer, and the isocyanate index of the MDI or TDI prepolymer is 100 to 120 percent. The surface of the glass bead is coated with a nano silicon dioxide porous shell layer in situ to form a unique'hard core-soft shell 'gradient interface structure, so that the interface bonding force between the filler and a polyurethane matrix is improved, stress transfer is optimized, and the foam material is endowed with excellent comprehensive mechanical properties, especially compressive strength and structural stability.

The invention discloses p-aminophenol polyether polyol, a preparation method of the p-aminophenol polyether polyol, and application of the p-aminophenol polyether polyol in an all-water foaming polyurethane open-cell system. The structure of the p-aminophenol polyether polyol is shown as follows: # imgabs0 # n is 5-10, and m is 1-5. The p-aminophenol polyether polyol contains benzene rings, has good compatibility with high-molecular polyether and a flame retardant TCPP, contains ether bonds, and has good compatibility with water. Meanwhile, the benzene ring structure has certain rigidity, and certain strength can be provided for all-water low-density polyurethane open-cell foam. The p-aminophenol polyether polyol can be used as main polyether of an all-water foaming polyurethane open-cell system, and compared with a traditional all-water foaming polyurethane open-cell system, the p-aminophenol polyether polyol has the advantages of being good in compatibility, high in latitude, high in compression strength, low in cost and the like.

The invention discloses a supercritical carbon dioxide thermosetting foaming polyurethane foam preparation method, which comprises: 1, preparing a polyurethane prepolymer: adding 20-80 parts by mass of a bifunctional polyol and 80-20 parts by mass of a trifunctional polyol into a reaction kettle, and carrying out vacuum dehydration at a temperature of 60-90 DEG C for 30-90 min; the addition amount of the isocyanate is 40%-200% more than that of the isocyanate group relative to the polyol, after the slurry continues to react for 2-5 hours at the temperature of 60-90 DEG C, an end-capping reagent is added, and the slurry continues to react for 1-3 hours. 2, mixing the materials, namely mixing the polyurethane prepolymer with 1, 4-butanediamine, and uniformly stirring; and 3, preparing the supercritical carbon dioxide foam. The preparation method has the beneficial effects that the foam prepared by the method is uniform and stable in foam hole size, and the performance requirements of high strength, abrasion resistance, high temperature resistance and corrosion resistance can also be met.

The present invention discloses a hydraulic cylinder with high buffering performance, which relates to the technical field of hydraulic cylinders and includes a reciprocating moving component, wherein the reciprocating moving component is used to drive the piston rod to move back and forth linearly. When the present invention is used, when the sealing piston is about to move to the end of the stroke, the buffer ring generates a thrust on the annular plate, causing the two nitrile rubber pads to be concave, and at the same time the return spring is squeezed and contracted. With the cooperation of the return spring and the nitrile rubber pad, the sealing piston is initially buffered. In addition, the connecting rod pushes the buffer plate to move inside the arc cover and gradually squeezes the polyurethane foam. The polyurethane foam has good buffering performance. The filled hydraulic oil generates viscous resistance. The squeezed hydraulic oil will enter the buffer chamber through the oil inlet chamber. With the cooperation of the polyurethane foam and the filled hydraulic oil, the sealing piston is buffered for the second time, so that the movement speed of the piston rod body is gradually reduced, and smooth deceleration and stopping are achieved.

The invention belongs to the technical field of foaming polyurethane, and provides a microsphere foaming polyurethane material, a base plate and a preparation method and application of the base plate, raw materials are prepared from a polyol component and an isocyanate component according to the proportion that the isocyanate index is 1.05-1.15; wherein the polyol component is prepared from the following components in parts by mass: 60 to 65 parts of polytetrahydrofuran polyol, 10 to 15 parts of poly trimethylene ether glycol, 6 to 8 parts of polypropylene oxide polyol A, 6 to 10 parts of polypropylene oxide polyol B, 4 to 6 parts of 1, 4-butanediol, 0.5 to 1.5 parts of trimethylolpropane, 0.3 to 0.5 part of a catalyst, 0.8 to 1.5 parts of a foam stabilizer, 0.5 to 0.7 part of a dispersing agent EFKA-4040 and 0.1 to 0.3 part of polyether modified polysiloxane BYK-333; 0.4 to 0.6 part of expansion microspheres and 0.1 to 0.3 part of water. According to the technical scheme, the problem that a polyurethane material in the prior art cannot have low compression set and excellent fatigue resistance at the same time is solved.

The utility model belongs to the technical field of waterproof board integrated fixing, and particularly relates to a rigid foam polyurethane and waterproof board integrated fixing structure and a construction tool thereof, and the rigid foam polyurethane and waterproof board integrated fixing structure comprises a waterproof board laid on the inner wall face of a tunnel; the I-shaped fixing clamp is arranged on the surface of the waterproof plate and used for controlling the spraying thickness of the rigid foam polyurethane layer; and the rigid foam polyurethane layer is sprayed on the surface of the waterproof plate and covers the I-shaped fixing clamp. The utility model has the advantages that the plastic I-shaped fixing clamp is welded on the outer side of the waterproof plate at the position of the hot melting gasket, and the adhesive force of the hot melting gasket shoot nail is fully utilized, so that the comprehensive bonding of the I-shaped fixing clamp, the rigid foam polyurethane and the waterproof plate is ensured, and the spraying thickness of the heat insulation layer is controlled by utilizing the height of the I-shaped fixing clamp; the void rate of the second lining is greatly reduced, the water temperature behind the lining in winter is kept stable, and the freeze injury prevention and control requirements are completely met.

The utility model relates to the technical field of foaming process, and provides a foaming mold which is used for forming polyurethane foam, a through hole is formed in the polyurethane foam, and the foaming mold comprises a fixed mold assembly, a fixed mold assembly and a movable mold assembly, the movable mold assembly movably abuts against the fixed mold assembly, a product cavity is formed by the movable mold assembly and the fixed mold assembly, and a second forming column is arranged on the movable mold assembly; one end of the first forming column abuts against one end of the second forming column and is used for forming a through hole; the abutting ends of the first forming column and / or the second forming column are provided with the hollowed-out parts, in the process of injecting a foaming agent and a base material, a mixture can flow into the hollowed-out parts, after forming, the mixture in the hollowed-out parts is separated from a product, and in the process of injecting the foaming agent and the base material next time, the mixture in the hollowed-out parts is left to play a role in soft sealing. Therefore, no flash is formed on the through hole after the product is formed, and an additional flash removing process does not need to be added, so that the production cost is reduced, and the working efficiency is improved at the same time.

The application discloses a kind of A2 grade hard foam polyurethane insulation board continuous processing equipment and its processing technology, belong to thermal insulation material processing technical field.Processing equipment includes polyurethane black material conveying device, polyurethane white material conveying device, high-pressure mixer, inorganic material conveying device, low-pressure mixer and pouring gun head, the output end of polyurethane black material conveying device and polyurethane white material conveying device are all communicated with the input end of high-pressure mixer, the output end of high-pressure mixer and inorganic material conveying device are all communicated with the input end of low-pressure mixer, the output end of low-pressure mixer is connected with the input end of pouring gun head, pouring gun head is installed on distributor, the upper side of pouring gun head is provided with upper coiled material, the lower side of pouring gun head is provided with lower coiled material.The A2 grade hard foam polyurethane insulation board continuous processing equipment and its processing technology of the application can solve the problem of inorganic filler settlement in pipeline after production stops, causing pipeline blockage.

The utility model belongs to the technical field of foaming, and particularly relates to a polyurethane foaming experiment device which comprises a foaming box, a base, a mixing barrel, a stirring rod and a monitoring system, the foaming box is of an open structure, and a top support is arranged at the opening and used for foaming polyurethane foam materials; the base is fixedly arranged on a top support of the foaming box and used for containing and heating foam materials. The mixing barrel is arranged in the base in a lifting manner and is used for adding different soaking materials; the stirring rod is nested in the material mixing barrel, and when the material mixing barrel rises, the stirring rod stirs the foam materials in the base; and the monitoring system is used for measuring various data in the polyurethane foaming process in real time. The polyurethane foaming experimental device disclosed by the utility model integrates batching, mixing, heating, injecting and foaming, is simple and convenient to operate, and can be used for measuring multiple items of data in the foaming process of foam materials.

The application discloses a kind of overburden separation zone reinforcement method of deformation sensitive structure goaf, including determining the boundary size and vertical height of overburden separation zone of goaf;Determine the boundary of blasting treatment of overburden separation zone of goaf;Design the amount of directional blasting explosive and the distance between explosive and the top of overburden separation zone, so that the rock and soil around explosive on the boundary of deformation sensitive structure foundation influence boundary is formed by directional blasting Throw pile;After the hole of hole drilling along the original blasthole distribution boundary to the original overburden separation zone bottom elevation and inject water reaction foaming polyurethane to form flow-plastic viscous liquid, flow-plastic viscous liquid rapidly diffuses along the upper and lower boundary of overburden separation zone and the interstice between original broken overburden separation zone accumulation block and forms blocking boundary;Deep grouting method is used to reinforce the cavity in blocking area.This method aims to reduce the disturbance of blasting on the upper soil layer and deformation sensitive structure, reduce the consumption of slurry, save engineering cost, and improve the treatment effect of goaf site.

The utility model relates to a full-glass curtain wall structure which comprises tempered glass, stainless steel channel steel, a glass curtain wall body, a glass curtain wall body and a glass curtain wall body. The rubber pads are cushioned on the upper side and the lower side of the tempered glass; the foam rod is filled between the flange of the stainless steel channel steel and the tempered glass, grooves are formed in the two ends of the foam rod, the foam rod is divided into multiple sections and is filled at intervals, and foaming polyurethane is injected into the intervals to fill the space between the foam rod and the rubber pad, so that the foaming polyurethane is combined with the grooves; the first cement mortar leveling layer is laid on the concrete structure bottom plate and the angle steel located on the concrete structure bottom plate; one side of the suspended ceiling is propped against the end part of the flange of the stainless steel channel above; and the sealant is filled along the foam rod and is used for sealing a gap between the cement mortar leveling layer and the tempered glass and a gap between the suspended ceiling and the tempered glass. The foam rod structure is not prone to loosening, and the sealing performance, the anti-leakage function and the service life can be guaranteed.

The invention relates to conductive hydrophilic flexible foam polyurethane as well as a preparation method and application thereof, the preparation method comprises the following steps: (1) mixing polyether glycol, diisocyanate and a tin catalyst to form a prepolymer, and then adding a foaming agent to obtain hydrophilic flexible foam polyurethane; (2) immersing the hydrophilic flexible foam polyurethane into the polyelectrolyte raw material solution, taking out and drying to obtain conductive hydrophilic flexible foam polyurethane; the polyelectrolyte raw material solution in the step (2) comprises a vinyl nitrogen heterocyclic compound, an acrylic acid compound, an initiator, an amine catalyst and water. Compared with the prior art, the conductive hydrophilic flexible foam polyurethane material prepared by the preparation method disclosed by the invention has good hydrophilicity and mechanical properties, introduces electrochemical response characteristics to the material, and can be used for preparing a sweat environment strain sensor with good strain responsiveness and humidity sensitivity.

The utility model relates to the technical field of curtain walls, in particular to an ultra-low energy consumption unit curtain wall node which comprises an upper cross beam and a lower cross beam, through openings are formed in the positions, right opposite to hollow glass, of the upper cross beam and the lower cross beam, rigid foam polyurethane is filled in the through openings, the upper cross beam and the lower cross beam are partially matched in an inserted connection mode, and a first sealing rubber strip is pressed in a fit clearance. The opposite faces of the upper cross beam and the lower cross beam define a first channel and a second channel which are separated by the inserting and matching position, the first sealing rubber strip extends into the first channel, and a second sealing rubber strip and a third sealing rubber strip which are used for pressing the first sealing rubber strip and blocking the first channel are arranged in the first channel. The rigid foam polyurethane is located between the second sealing rubber strip and the third sealing rubber strip. The mode of pouring and filling the rigid foam polyurethane is adopted, so that the rigid foam polyurethane and the aluminum alloy profile are integrally formed, the situation that the heat transfer efficiency is reduced due to direct contact of the hollow glass and the aluminum alloy profile is avoided, water leakage and air leakage can be reduced or even avoided, and energy consumption can be reduced.

The invention belongs to the field of thermal insulation materials, and particularly relates to a preparation method of an all-water-blown polyurethane thermal insulation material for an environment-friendly ultrathin freezer, which comprises the following steps: adding nickel nitrate hexahydrate, trimesic acid and polyvinylpyrrolidone into a mixed solvent of DMF (Dimethyl Formamide) and water, reacting under a vacuum condition, cleaning and drying to obtain the all-water-blown polyurethane thermal insulation material for the environment-friendly ultrathin freezer. The spherical nickel-based MOF material is obtained; calcining the obtained spherical nickel-based MOFs material in a nitrogen environment, and naturally cooling to obtain a spherical porous derived carbon material; mixing polyol, water, resin, triethanolamine and the obtained spherical porous derived carbon material, and performing ultrasonic dispersion to form a component A; stannous octoate and isocyanate are mixed to form a component B; and mixing the component A and the component B to obtain the target product. The environment is not polluted, the heat preservation performance is improved, meanwhile, the compression strength can be improved, and core burning and cracking are not likely to happen.

The application relates to the technical field of architectural design, in particular to a metal texture slope roof suitable for tropical storm and typhoon areas, which comprises, from bottom to top, a reinforced concrete roof panel, a mortar layer, a three-layer waterproof layer, an isolation layer, a concrete protective layer and a silver gray paint layer; the three-layer waterproof layer comprises a polyurethane waterproof paint layer, an elastomer modified bitumen waterproof roll material and a hard foam polyurethane spraying layer. Reinforced anchor rings, reinforced meshes and cold-drawn steel wire meshes are all arranged in the concrete layer and have no direct contact with the atmosphere, so that corrosion and loss of effectiveness are avoided, and roof corrosion prevention is effectively realized; through the design of the three-layer waterproof layer, waterproof effect is effectively achieved, and heat preservation effect is simultaneously achieved; the metal texture slope roof suitable for tropical storm and typhoon areas is designed in the aspects of material selection, construction technology and combination reliability to adapt to tropical storm and typhoon areas, so that the requirements of roof structure on wind lifting resistance, waterproofness and corrosion resistance are met.

The present invention provides a foamed polyurethane composition that can form a foam with excellent flame retardancy, is easy to handle due to the low formation of precipitates during storage, and can suppress wear on spraying equipment and other devices used during application. [Solution] A foamed polyurethane composition comprising a polyol compound, a polyisocyanate compound, a catalyst, a blowing agent, and a liquid flame retardant, wherein the foamed polyurethane composition substantially does not contain inorganic fillers, and the weight loss rate at 300°C when the polyurethane foam formed from the foamed polyurethane composition is 40% or less when measured by TG-DTA under the following conditions. The TG-DTA measurement is performed by cutting a sample from a position 5 mm to 10 mm from the surface of the polyurethane foam, and measuring the sample at a heating rate of 10°C / min and a measurement temperature range of 40 to 1000°C.

The utility model discloses a winter cold-proof device for landscaping plants, which comprises a plurality of tile-shaped support frames arranged around green plants. Heat preservation mud filling holes and penetrating threading holes are formed in the supporting frames, and the multiple supports are bound to the green plants through fine lines; the support is wrapped by a flexible supporting grid and coated with heat preservation mud, and the outermost layer is covered with a heat preservation felt. The support is made of foaming polyurethane materials and provided with anti-skid protrusions, the filling heat preservation mud is made of kieselguhr or bentonite, and the outer grid is a glass fiber woven mesh. The device has the advantages of being reasonable in structure, excellent in heat preservation performance, wide in application range, convenient to assemble and disassemble and the like, and green plants can be effectively prevented from being damaged in winter freezing injury.

The utility model discloses a polyurethane foaming mold with a buffering function, which relates to the technical field of plastic foaming molds and comprises a molding groove, an input port for injecting foaming agents is arranged on the front side of the molding groove, a heating pipeline for maintaining the temperature required by a polyurethane foaming process is arranged in the molding groove, and two sides of the molding groove are respectively provided with a fixing plate. A first hydraulic cylinder is erected between the two fixing plates, a large amount of steam is generated in the polyurethane foaming process, balance of air pressure in a molding groove is maintained through mutual cooperation of a second elastic base and a sealing cover, polyurethane is kept to be attached to a lower pressing plate all the time, and the foaming quality is improved; when foamed polyurethane is ejected out, whether cooling of the polyurethane is completed or not is detected, if the polyurethane is still kept attached to the molding groove, the first buffer seat elastically deforms, the sensing block makes contact with the pressure sensor, the pressure sensor sends a signal to the buzzing alarm, a worker is informed of detecting the foaming condition of the polyurethane, and the machining quality is improved.

Polyurethane foam compositions may contain a polymer matrix prepared by curing a reaction mixture containing an isocyanate-reactive component including one or more polyether polyols having a hydroxyl number from 25 to 100 mg KOH / g, as determined in accordance with ASTM D4274, and having from two to eight hydroxyl groups per molecule; one or more hydroxyl-terminated prepolymers; an FR additive component comprising an ammonium polyphosphate and an alkaline earth metal carbonate in a weight ratio of from 1.3:1 to 6.5:1, and present at a percent by weight of the isocyanate-reactive component (wt%) ranging from 6 wt% to 50 wt%; and an isocyanate component including one or more polyisocyanates.

The utility model relates to a metal -faced polyurethane sandwich panel for building, it is designed to solve the current traditional rock wool sandwich panel hygroscopic, physical foaming agent hulling and high thermal conductivity of full water foaming polyurethane technical problem, including upper and lower two metal surface layers and the polyurethane core material of middle, upper and lower the metal surface layer and polyurethane core material are pasted and contact, polyurethane core material is made through full water foaming process and foaming agent is the carbon dioxide of water and isocyanate reaction generation, the utility model discloses full water foaming technology replaces physical foaming agent, through optimizing combination polyol formula and production process, the heat preservation performance is significantly improved, and the structure stability of sandwich panel under the building load -bearing and extreme temperature environment is guaranteed simultaneously.

The invention discloses an electric heating material with high adhesive force to foamed polyurethane and preparation and application thereof, the material is of a network polymer structure, an organic monomer molecule A and a catalyst are used as film-forming and insulating materials, and after curing is completed, the material has good adhesive force to a foamed polyurethane base material. The invention also discloses a preparation method and application of the compound. The electric heating material precursor is printed on a foaming polyurethane base material in a silk-screen printing mode, an electric heating element with high adhesive force can be obtained, and the electric heating material precursor is suitable for being used as an electric heating element of bedding articles, aerospace seats and other products.

The invention discloses a detachable multifunctional composite structure for an underground LNG (Liquefied Natural Gas) reservoir model test and a mounting method of the detachable multifunctional composite structure. The composite structure comprises a heat preservation panel and sealing plugs, the heat preservation panel is in a cylinder shape and sequentially comprises a sealing layer, a heat preservation layer and a damp-proof layer from inside to outside, the outer side of the cylinder is used for making contact with a geological model of the LNG storage cavern, the inner space of the cylinder is used for containing an LNG container model, and the sealing plugs are located on the two end faces of the cylinder and used for sealing the inner space of the cylinder. The heat preservation layer is composed of lightweight concrete or multiple layers of rigid foam polyurethane heat preservation plates, and the multiple layers of structures are of a detachable structure. The test cost can be remarkably reduced, the multi-scene test requirements are met, and the ultra-low temperature performance requirement of the underground LNG storage cavern model test is met.

The present invention relates to the technical field of wood adhesives, specifically a foaming polyurethane adhesive prepared from the following raw materials in parts by weight: 40-60 parts diphenylmethane diisocyanate (MDI); 20-40 parts polyphenylmethane polyisocyanate (PMDI); 10-30 parts hexamethylene diisocyanate (HDI); 5-15 parts chain extender; 0.1-0.5 parts catalyst; and 1-5 parts foaming agent. The chain extender has a number average molecular weight (Mn) of ≥1000. The invention also relates to a method for preparing the foaming polyurethane adhesive through prepolymer preparation, component mixing, and gradient curing. This invention systematically addresses the problems of performance imbalance, poor penetration, and curing mismatch in foaming adhesives used in particleboard applications.

The invention belongs to the technical field of polyurethane flexible foam, and discloses a composite antioxidant for improving yellowing of flexible foam polyurethane and a preparation method of the composite antioxidant. The antioxidant is formed by compounding hindered phenols, hindered amines and phosphite esters, component synergy is enhanced through a temperature gradient step-by-step mixing process, and the antioxidant has excellent thermal oxidative yellowing resistance, gas smoking yellowing resistance and hydrolysis resistance. According to the present invention, the preparation process is simple and convenient, the cost is controllable, the appearance stability of the flexible foam polyether polyol can be significantly improved, and the service life of the flexible foam polyether polyol can be significantly prolonged.

The present invention aims to provide an insulating structure that offers high insulation against outside air and is easy to install. [Solution] The thermal insulation structure (10) of the present invention comprises a plurality of thermal insulation layers (23, 26) having foamed polyurethane resin, and an intermediate layer (25) disposed in at least one of the gaps between the thermal insulation layers (23, 26), wherein the intermediate layer (25) has polyurea resin. The outermost layer, which is the outermost thermal insulation layer (26) among the thermal insulation layers (23, 26), may have an outer skin layer (28) formed integrally with the outermost layer on its outer surface, and the outer skin layer (28) may have polyurea resin.

The invention relates to a spraying rigid foam polyurethane material for building exterior walls, which is composed of a component A and a component B. The component A comprises the following raw material components in parts by weight: 65-76 parts of polymer polyol, 1.8-3.5 parts of a chain extender, 0.55-0.85 part of a foam stabilizer, 0.67-0.85 part of a catalyst I, 1.2-1.75 parts of epoxy vinyl ester resin, and 0.01-0.5 part of a weather-resistant auxiliary agent. And the component B is polyphenyl methane polyisocyanate. Compared with the prior art, by adopting the mutual combination of the polymer polyol, the chain extender, the foam stabilizer, the weather-resistant additive and the like, the flame retardance, the mechanical property and the weather resistance of the product are improved.

The invention discloses an all-water-blown polyurethane self-skinning motor cover material and a preparation method thereof.The preparation method of the all-water-blown polyurethane self-skinning motor cover material comprises the steps that polyether polyol with the functionality being 2-4, polymer polyol with the hydroxyl value being 18-32 mgKOH / g, a chain extender, water, a catalyst and a foam stabilizer are evenly mixed to obtain a component A; uniformly mixing isocyanate and a liquid flame retardant to obtain a component B; preparing a component C to obtain a solid flame retardant; the preparation method comprises the following steps: uniformly mixing the component A and the component C, then uniformly mixing the mixture with the component B to obtain a mixture, carrying out mold closing and curing on the mixture, and controlling the mold temperature to be 25-75 DEG C during mold closing and curing. According to the invention, surface urea bond accumulation is realized through matching of solid and liquid flame retardants and surface self-skinning, so that the material can realize a long-period anti-aging effect and a high-efficiency V0-level flame-retardant effect in a high-temperature environment of more than 150 DEG C, and has high thermal aging resistance and flame retardance.

Polyurethane foam compositions include a reaction product of: an isocyanate component including one or more isocyanate compound, and an isocyanate-reactive component containing: an ethylene oxide-rich (EO-rich) polyether polyol at a percent by weight (wt %) of 10 wt % to 35 wt %; a propylene oxide-rich (PO-rich) polyether polyol at a percent by weight (wt %) of 30 wt % to 80 wt %; and a polyester polyol at a percent by weight (wt %) of 10 wt % to 35 wt %, polyester polyol based on reaction product of an aromatic diacid or alkyl diacid and a polyol having an OH functionality 2 to 4.