673 results about "Blowing agent" patented technology

The invention discloses a solvent-resistant foaming material and a preparation method thereof, and relates to the technical field of high-molecular compound rubber foaming materials. The solvent-resistant foaming material is prepared from the following raw materials in parts by mass: 90 parts of a basic polymer, 5-25 parts of a chemical foaming agent, 0.5-5 parts of a cross-linking agent, 0.5-8 parts of a foaming aid, 5-40 parts of filler, 10-30 parts of a solvent-resistant modifier, 0.5-5 parts of a processing aid and 0.5-1.5 parts of an anti-aging agent. Through the synergistic effect of the base polymer (the nitrile rubber and the butadiene rubber are mixed according to the ratio of 1: 1) and the solvent-resistant modifier (such as polytetrafluoroethylene powder), the problem that a traditional foaming material is easy to swell and deform in an organic solvent environment is solved. On the trend, the volume swelling rate and the mass change of the material in a solvent are effectively reduced, the infiltration resistance is enhanced, the structural integrity of the material is kept when the material is in contact with lubricating oil or an alcohol solvent for a long time, and therefore the service life of a sealing piece is prolonged.

The invention relates to the technical field of refrigeration material preparation, in particular to an efficient passive radiation refrigeration material suitable for a sub-super environment and a preparation method and application of the efficient passive radiation refrigeration material. The method comprises the following steps: uniformly mixing thermoplastic polyurethane, sunlight high-reflection inorganic particles and a phase change material in a solvent; after a chemical foaming agent is added, the obtained suspension liquid is heated and foamed in a confinement mold, and wet gel is formed; and finally, carrying out freeze drying treatment to obtain the composite porous aerogel. The prepared material has a micro-nano porous skeleton formed by TPU, and inorganic particles and PCM are uniformly dispersed in the skeleton wall. Through component cooperation and a special porous structure, the material has extremely high sunlight reflectivity and mid-infrared emissivity, self-adaptive temperature regulation and control are achieved through PCM phase change, the problem that refrigeration of a traditional material fails in the sub-environment such as the vertical surface is effectively solved, and efficient sub-super-environment heat management is achieved.

The invention discloses a heat-insulating non-combustible material as well as a preparation method and application thereof, and belongs to the technical field of heat-insulating non-combustible materials. The preparation method of the material comprises the following steps: (1) mixing and modifying an inorganic flame retardant and a surface modifier to obtain a modified inorganic flame retardant with the particle size of 100-500nm; (2) adding the modified inorganic flame retardant into the graphene oxide solution to obtain a graphene oxide coated modified inorganic flame retardant; (3) mixing 50-60 parts of polyether polyol, 20-30 parts of polyester polyol, 3-5 parts of a foam stabilizer, 2-3 parts of a catalyst, 15-18 parts of a foaming agent, 65-80 parts of modified expandable graphite, 150-200 parts of a graphene oxide coated modified inorganic flame retardant and 0.9-1.5 parts of water to obtain a mixed solution; and (4) adding 100-150 parts of diisocyanate into the mixed solution, stirring, pouring into a mold, foaming and curing, thereby obtaining the polyurethane foaming material. According to the heat-insulating non-combustible material, polyurethane is taken as a matrix, and the graphene-coated inorganic flame retardant is introduced, so that the heat retaining property, the mechanical property and the heat stability of the material are improved on the premise of ensuring the flame retardant property.

The invention belongs to the technical field of wind power generation blade filling materials, and particularly relates to a polyurethane foam filling material for a wind power generation blade and a preparation method and application of the polyurethane foam filling material. Wherein the component A comprises the following components: polyether polyol a, polyether polyol b, polyether polyol c, polyester polyol d, a viscosity reducer, a cross-linking agent, a foam stabilizer, a catalyst, chemical foaming agent water and an auxiliary agent; the component B is polymethylene polyphenyl polyisocyanate; the polyether polyol a is polyether polyol prepared by taking enzymatic hydrolysis lignin, pentaerythritol, trihydroxymethyl melamine and propylene glycol as initiators and carrying out a reaction; the polyether polyol b is polyether polyol which is prepared by taking bisphenol A and trimethylolpropane as initiators; the filling material prepared by the invention is safe, green and environment-friendly, has the advantages of low density, high strength, better process adaptability and excellent dimensional stability, and also can provide good weather resistance.

The invention relates to a preparation method of a high-elastic wear-resistant rubber sole. Comprising the following steps: S1, uniformly mixing 50-60 parts by weight of epoxy resin, 10-20 parts by weight of a polyurethane-acrylate copolymer, 20-30 parts by weight of an elastic complex, 3-5 parts by weight of stearic acid, 1-4 parts by weight of zinc oxide, 3-5 parts by weight of zinc stearate and 2-4 parts by weight of zinc oxide; the preparation method comprises the following steps: uniformly mixing 1-3 parts by weight of magnesium oxide and 1-3 parts by weight of an AC foaming agent in an internal mixer at the temperature of 60-70 DEG C, internally mixing for 30-60 minutes, continuously mixing for 15-20 minutes at the temperature of 90-95 DEG C, granulating after open milling, and standing for 20-24 hours at room temperature to obtain a molding master batch; s2, putting the molding master batch into a foaming mold for compression molding, controlling the mold closing pressure to be 15-25MPa, then heating to 180-190 DEG C together with the foaming mold, performing vulcanization treatment for 8-15 minutes, cooling, and performing standing treatment at room temperature for 20-24 hours to obtain the high-elasticity wear-resistant rubber sole. According to the high-elastic wear-resistant rubber sole, the preparation method and the damping shoe, a good damping effect is achieved, and certain mechanical strength is achieved.

The invention discloses a closed-cell heat-conducting flame-retardant foamed silica gel material and a preparation method thereof in the field of organic silicon functional materials. The closed-cell heat-conducting flame-retardant foamed silica gel material is prepared from the following raw materials: basic silica gel, silane modified boron nitride, titanate modified aluminum hydroxide, a foaming agent, a cross-linking agent, a catalyst, an inhibitor and absolute ethyl alcohol. The raw materials are mixed according to a certain mass ratio. Wherein the silane modified boron nitride is prepared by heating, refluxing and reacting boron nitride powder and a silane coupling agent in an ethanol solvent and then drying; the titanate modified aluminum hydroxide is prepared by ultrasonically dispersing aluminum hydroxide powder and a titanate coupling agent in deionized water, adjusting the pH value, reacting and drying. The preparation method comprises the following steps: mixing the basic silica gel with the two modified fillers at a high speed, sequentially adding other raw materials, continuously mixing, transferring into a mold, pressurizing at a certain temperature to complete vulcanization foaming, taking out, washing with water, and drying in vacuum. According to the material, the interface bonding force is improved through the modified filler, and the material has the characteristics of high heat conductivity, high flame retardance and stable closed-cell structure.

The invention relates to the technical field of modified polyurethane preparation, in particular to a modified rigid polyurethane foam material and a preparation method thereof.The material is specifically prepared from CO2-based polyol, polyether, deionized water, a foaming agent, a catalyst, a foam stabilizer and isocyanate. Wherein CO2-based polyol is introduced into original polyether polyol, specifically, poly (ethylene carbonate) polyol is added, so that the heat conductivity coefficient of the material can be reduced, the compression strength of the material can be improved, and the low-cost and high-performance polyurethane foam can be prepared. The finally prepared rigid polyurethane foam material has the characteristics of good heat insulation property and high pressure resistance; and the whole preparation process is simple, the whole cost is low, and the market competitiveness is high.

A house wrap for a building comprises a reinforcing drainage plane layer configured to face the outside of the building; a breathable, non-perforated barrier film bonded to the drainage plane layer; and at least one insulating layer including a perforated expanded low density polyethylene foam layer, wherein in the expanded low density polyethylene layer at least 80% of the blowing agents are dissipated from closed cells within the expanded low density polyethylene layer, forming evacuated closed cells whereby a partial vacuum is formed within the closed cells of the low density polyethylene layer.

An injection molding system is provided. A mixing unit is configured to mix a flowable polymeric material with a blowing agent to form a mixture. A fluid supply unit is configured to provide the blowing agent to the mixing unit. The fluid supply unit includes an injection outlet coupled to the mixing unit, a compressor configured to generate the blowing agent, an injection valve disposed between the injection outlet and the compressor and configured to receive the blowing agent from the compressor through a first passage, and a cleaning mechanism configured to clean the injection valve. The cleaning mechanism includes a control valve coupled to the compressor through a second passage and coupled to the injection valve through a third passage connected to the first passage, and an actuating device configured to actuate the control valve. The blowing agent is flowable to the injection valve through the control valve.

The invention relates to the technical field of PVC (polyvinyl chloride) foaming materials, in particular to a TPU (thermoplastic polyurethane) modified PVC foaming material, artificial leather and a preparation method of the artificial leather. The TPU modified PVC foaming material comprises the following raw materials in parts by weight: 35-45 parts of TPU, 80-85 parts of PVC, 8-12 parts of epoxidized soybean oil, 7-11 parts of an additive based on a stable function, 4-6 parts of a modified zirconium silicate agent, 3-5 parts of a silane coupling agent KH560, 2-5 parts of a foaming agent, 2-3 parts of a heat stabilizer and 1-3 parts of an antioxidant. According to the foaming material, TPU and PVC are adopted as base materials, the epoxidized soybean oil, the foaming agent, the heat stabilizer and the antioxidant are added to serve as functional auxiliaries, meanwhile, the additive based on the stability-resistant function and the modified zirconium silicate agent are added to serve as blending materials, and the prepared foaming material is excellent in abrasion resistance, heat conduction and rebound resilience through blending, cooperation and common synergism of the raw materials.

The invention relates to hollow glass microsphere modified expanded graphite anti-settling polyurethane and a preparation method thereof.The hollow glass microsphere modified expanded graphite anti-settling polyurethane is composed of a polyurethane prepolymer, expanded graphite, hollow glass microspheres, a silane coupling agent, a catalyst, a foaming agent and a stabilizer, the expanded graphite and the hollow glass microspheres are mixed in proportion, an ethanol solution of the silane coupling agent is added, stirring is conducted, and the hollow glass microsphere modified expanded graphite anti-settling polyurethane is obtained. Performing ultrasonic treatment and drying to obtain modified composite filler; the preparation method comprises the following steps: mixing polyether polyol and polyisocyanate for reaction to prepare a polyurethane prepolymer; and adding the modified composite filler into the prepolymer, and sequentially adding the catalyst, the foaming agent and the stabilizer. Through composite modification of the hollow glass microspheres and the expanded graphite, the low density of the hollow glass microspheres and the high specific surface area of the expanded graphite are utilized, a stable three-dimensional network structure is formed, filler sedimentation is effectively prevented, the sedimentation rate is smaller than 5% and is far superior to that of a traditional polyurethane composite material, and long-term stability of material performance is ensured; the characteristics of light weight, high strength, heat insulation and settlement prevention are realized.

The invention provides a low-warpage PA66 material and a preparation method thereof, and the preparation method comprises the following steps: mixing PA66 resin, modified mica, short carbon fiber, oxidized polyethlene wax and a titanate coupling agent, discharging and sieving to obtain a uniform premix; extruding and granulating through double screws; performing injection molding; and carrying out hot-bath shaping to obtain the product. According to the invention, by adopting a scale-fiber composite reinforcing system, modified mica sheets (transverse shrinkage inhibition) and short carbon fibers (longitudinal reinforcement) are compounded according to a specific proportion to form a cross lock catch structure, and bidirectional shrinkage stress is counteracted, so that the warping degree is reduced; the gradient microporous buffer layer is introduced, a 50-200 [mu] m closed pore structure is formed on the surface layer through a foaming agent ethanol solution in the injection molding stage, and internal stress is absorbed through elastic deformation of micropores, so that the residual stress is reduced, the impact strength is improved, and the brittleness problem of a traditional low-warping material is avoided.

The invention belongs to the technical field of high polymer materials, and discloses a two-component polyurethane pouring sealant and a preparation method thereof.The two-component polyurethane pouring sealant comprises a component A and a component B. The component A comprises, by weight, 40-60 parts of bio-based polyether polyol, 10-15 parts of boron nitride nanosheets, 5-10 parts of graphene modified epoxy resin, 1-3 parts of a silane coupling agent and 0.5-1.5 parts of a supercritical fluid foaming agent; the component B is prepared from 30 to 50 parts of carbodiimide modified MDI (methylene diphenyl diisocyanate), 10 to 20 parts of dendritic polyurethane cross-linking agent and 2 to 5 parts of nano aluminum hydroxide filler; the mixing ratio of the component A to the component B is (2-3): 1; the invention aims to provide the two-component polyurethane pouring sealant and the preparation method thereof, and through material innovation and process integration, the two-component polyurethane pouring sealant which is high in heat conductivity, environment-friendly, weather-resistant and low in internal stress is provided.

The invention relates to the technical field of preparation of polyurethane plastic materials, in particular to an environment-friendly high-elasticity foaming material as well as a preparation method and application thereof. The preparation method of the foaming material comprises the following steps: perfluorooctyl sulfonyl fluoride and diaminopropyl polydimethylsiloxane are subjected to a reaction, and fluorine-containing polydimethylsiloxane is obtained; the preparation method comprises the following steps: reacting 3-(3, 5-di-tert-butyl-4-hydroxyphenyl) propanohydrazide with terephthalic diisothiocyanate to obtain isothiocyanate modified hindered phenol; the isothiocyanate modified hindered phenol reacts with primary amine at the terminal position of a fluorine-containing polydimethylsiloxane molecule through an isothiocyanate group to obtain an intermediate, and the intermediate is subjected to a desulfurization reaction to obtain a modifier; the preparation method comprises the following steps: reacting diisocyanate with polyether polyol, polyester polyol and natural polyol to obtain a component A, and stirring and mixing polyether polyol, a bio-based chain extender, a modifier, a catalyst and a foaming agent to obtain a component B; stirring and mixing the component A and the component B, and foaming to obtain the environment-friendly high-elasticity foaming material.

The invention provides a polyurethane foam pouring sealant for a battery unit and a preparation method of the polyurethane foam pouring sealant, and belongs to the technical field of pouring sealants. The polyurethane foam pouring sealant for the battery unit comprises a component A and a component B, the component A comprises first polyether polyol, second polyether polyol, vegetable oil modified polyol, a foam stabilizer, a heat-conducting filler, a foaming agent and a flame retardant; wherein the first polyether polyol takes polyamine as an initiator, the second polyether polyol takes second polyol as an initiator, the functionality of the second polyol is 4-6, the third polyether polyol takes third polyol as an initiator, and the functionality of the third polyol is 3; and the component B comprises isocyanate, third polyether polyol and an amino silane coupling agent. According to the invention, a plurality of different polyether polyols are used as raw materials, and the components are combined and interact with one another, so that the polyurethane foam pouring sealant with low viscosity, good fluidity, high thermal conductivity, high strength and high flexibility is obtained.

A sheathing system that envelops a building structure includes a multi-layer panel having at least one structural layer formed of a non-wood material, such as polycarbonate. The panel also includes at least one layer of a high R-value insulation material. The insulation layer includes a coated insulation product with a reduced fluorinated blowing agent concentration, while maintaining acceptable thermal properties. The coated insulation product includes a foam product that is coated with a barrier coating. The barrier coating includes a polymer having a minimum degree of crystallinity and at least one additive.

The invention discloses silicon polyurethane modified acrylic emulsion foaming printing adhesive cement and a preparation method thereof. The foaming printing adhesive cement is prepared from deionized water, a defoaming agent, an emulsifying agent, a buffering agent, an initiator, silicon PU modified acrylic emulsion, butyl acrylate, methyl methacrylate, itaconic acid, hydroxyethyl acrylate, a functional monomer, styrene, silane, a preservative and the like. The milk white liquid with blue fluorescence is prepared through a pre-emulsification technology, the viscosity is 300-600 mPa.s, the solid content is 47%-51%, a film forming matter is colorless and transparent, the pH is 7-8, the emulsion has the advantages of being high in adhesive force, good in water resistance and good in toughness, the preparation method is convenient to operate, water serves as a dispersion medium, harm to human bodies and the environment is avoided, and the production environment is safe. Foaming printing adhesive cement obtained from a physical foaming agent, titanium dioxide and the like prepared from the emulsion has a relief type three-dimensional ink pattern and a high-saturation color effect.

Thermally expandable microspheres comprise a polymeric shell surrounding a hollow core, wherein the hollow core comprises a blowing agent, and the polymeric shell comprises isolated lignin.

The invention provides a tourmaline pretreatment and polyurethane sponge integrated production process. The process comprises the following steps: firstly, cleaning and drying tourmaline particles, and ball-milling and crushing the tourmaline particles to 1-10 microns; carrying out surface modification on the powder by adopting a silane coupling agent ethanol solution; mixing and dispersing the modified powder and polyol, adding isocyanate, a foaming agent and a catalyst, and uniformly stirring; the mixture is injected into a mold for foaming, and finally curing and post-treatment are performed to obtain the tourmaline polyurethane sponge. The particle size of the tourmaline is successfully reduced to a micron level through a crushing process and a grinding aid, the particles under the scale can effectively exert the health function of the tourmaline, roughness and discomfort caused by direct use of original particles are thoroughly eliminated, meanwhile, the surface is modified, the particles are perfectly embedded in a sponge base body, and the service life of the tourmaline is prolonged. The final product is very soft and flat in touch, and the unevenness and friction feeling existing in the traditional product mixed with large particles are completely avoided.

The invention belongs to the technical field of polymer materials, and provides a high-bonding-strength flame-retardant waterproof composite board for a tunnel and a preparation method and application of the high-bonding-strength flame-retardant waterproof composite board for the tunnel. The polyurethane layer is sprayed on the surface of the waterproof board layer and is prepared from polyol and isocyanate according to the proportion that the isocyanate index R is equal to 1-1.1, and the polyol comprises a chain extender, a foaming agent, a foam stabilizer, a catalyst, polyether polyol, water and a flame retardant B; wherein the flame retardant A is microencapsulated red phosphorus modified by vinyltriethoxysilane, and the flame retardant B is microencapsulated red phosphorus modified by gamma-aminopropyltriethoxysilane. By means of the technical scheme, the problems that in the prior art, the bonding strength of a waterproof board and polyurethane in a composite board is poor, and meanwhile the flame retardant property of the waterproof composite board is poor are solved.

The invention discloses a manufacturing process of a physically foamed polyethylene insulated cable, and belongs to the technical field of cable preparation. The manufacturing process of the physically foamed polyethylene insulated cable comprises the following steps: step 1, twisting multiple strands of copper, and cleaning to obtain a conductor material; 2, adding polyethylene resin, nano silicon dioxide, a free radical trapping agent, a performance additive and an antioxidant 1010 into a high-speed mixer, then adding calcium stearate to obtain a mixture, and carrying out melt plasticizing, injection of a physical foaming agent, extrusion and cooling on the mixture to obtain an insulating layer material; and 3, tightly wrapping the insulating layer material on the surface of the conductor material, then wrapping the insulating layer material with an aluminum foil, then wrapping the insulating layer material with a polyurethane material, winding a metal steel wire on the outer layer of the polyurethane material, and carrying out laser engraving to obtain the physically foamed polyethylene insulated cable. The cable prepared by the method has excellent aging resistance, thermal stability, mechanical property and insulating property.

The invention relates to the technical field of high polymer materials, and particularly discloses a high-resilience automobile cushion filling material, a preparation method and an automobile cushion. The material is prepared by taking an ethylene-1-octene copolymer (POE), polypropylene (PP), an ethylene-vinyl acetate copolymer (EVA), a hydrogenated styrene-butadiene-styrene block copolymer (SEBS), a nano dispersant, an antioxidant and a foaming agent as raw materials through melt blending and kettle pressure foaming. A uniform foaming structure is constructed by virtue of elastic synergy of an ethylene-1-octylene copolymer (POE) and a hydrogenated styrene-butadiene-styrene block copolymer (SEBS), interfacial compatibilization of an ethylene-vinyl acetate copolymer (EVA) and combination of a nano dispersing agent for refining foam holes; the antioxidant improves the aging resistance, so that the material has high compression resilience, low compression permanent deformation and excellent fatigue resistance. The material is used for filling the automobile seat cushion, can realize rapid resilience, does not collapse for a long time, and provides lasting and comfortable experience.

The invention belongs to the technical field of polyurethane elastomers, and particularly relates to a high-adhesion and high-moisture-permeability polyurethane microporous elastomer as well as a preparation method and application thereof. Comprising a component A and a component B, wherein the component A comprises 55-80 parts of polyester polyol P1; 20 to 45 parts of polyester polymer polyol P2; 5 to 10 parts of silane modified polyether polyol S1; 3 to 10 parts of a chain extender; 1-2 parts of a cross-linking agent; 0.3 to 0.6 part of a foam stabilizer; 0.5 to 0.8 part of a foaming agent; 1-2 parts of a catalyst; the component B comprises the following components in parts by weight: 10-20 parts of polyester polyol P1; 2 to 10 parts of silane modified polyether polyol S1; and 70 to 88 parts of isocyanate. The prepared polyurethane microporous elastomer not only has excellent bonding strength and stable processability (no bubble is generated), but also has remarkably improved moisture permeability, comfort, high elasticity and folding resistance when being used as a sole material.

The invention relates to polyurethane antibacterial breathable memory foam as well as a preparation method and application thereof, and mainly solves the problems that in the prior art, polyurethane memory foam is poor in breathability, easy to breed bacteria and relatively low in tearing performance after being washed with water. According to the novel polyurethane antibacterial breathable memory foam and the preparation method thereof, the novel polyurethane antibacterial breathable memory foam is prepared from the following components in parts by weight: 30 to 60 parts of polyether polyol A, 25 to 50 parts of polyether polyol B, 5 to 15 parts of polyether polyol C, 5 to 10 parts of polymer polyol D, 5 to 10 parts of antibacterial polyether polyol E, 1.5 to 3.5 parts of water, 0 to 10 parts of a physical foaming agent, 0.3 to 1.5 parts of a polyurethane catalyst, 1 to 2.5 parts of a foam stabilizer and 0 to 1 part of color paste, according to the technical scheme, the problems are well solved, and the composite material can be applied to household fields such as pillows and mattresses and filtering systems for sewage purification treatment and the like.

The invention belongs to the field of manufacturing of automobile parts, and particularly relates to a preparation process of a polyurethane foaming high polymer material, which comprises the following steps: uniformly mixing polyether polyol, a copper-plated graphite-graphene material, a foaming agent, dibutyltin dilaurate and silicone oil, then adding isophorone diisocyanate, uniformly mixing, and carrying out extrusion molding to obtain the polyurethane foaming high polymer material. Pouring into a mold, foaming in a megasonic environment, and after foaming is finished, feeding into a drying oven for curing; the polyurethane foaming high polymer material is obtained; the material is good in heat-conducting property, and the heat-conducting property cannot be obviously reduced even after long-term repeated extrusion and rebounding; even if the material is dried after absorbing moisture / water, the heat-conducting property and the sound-absorbing property are not obviously reduced; the invention has high application value and is especially suitable for the automobile field.

The invention discloses a method for synthesizing thermal expansion microspheres by a controlled free radical polymerization method and a product thereof. The method comprises the following steps: mixing a nitrile monomer, an acrylate monomer, an initiator, a cross-linking agent, a foaming agent and an RAFT reagent to form an oil phase, emulsifying and dispersing the oil phase and a water phase containing inorganic salt and a dispersing agent, and carrying out polymerization reaction under the protection of nitrogen by adopting an optimized two-stage temperature control process (55 DEG C / 20h to 65 DEG C / 8h) to prepare the thermal expansion microsphere with the core-shell structure. 2-cyano-2-propylbenzo dithio acid ester is preferably used as an RAFT reagent, so that the compactness of a shell layer of the obtained microsphere polymer is remarkably improved, the expansion rate is higher, the temperature resistance is better, and the application range of the thermal expansion microsphere is widened.

The invention relates to the technical field of bio-based degradable high polymer materials, in particular to a bio-based degradable pearl wool microcellular foaming material. The composite material is prepared from the following components in parts by mass: 70-85 parts of a bio-based polyester resin composite system of polylactic acid and poly (terephthalic acid)-butylene adipate (in a mass ratio of 60: 40-75: 25), 10-20 parts of bagasse microfibers modified by a silane coupling agent, 1.5-4 parts of a composite nucleating agent of flaky talcum powder and spherical nano calcium carbonate (in a mass ratio of 1.5: 1-2.5: 1), the bio-based plasticizer is prepared by compounding epoxidized soybean oil and tributyl citrate, the montmorillonite degradation accelerant is loaded with iron and cobalt ions (the molar ratio is 3: 1-5: 1), and the mixed foaming agent is prepared from 5-12 parts of supercritical carbon dioxide and nitrogen (the volume ratio is 60%-85%). A bio-based polyester composite system of polylactic acid and PBAT is adopted, silane modified bagasse microfibers are matched, montmorillonite loaded with iron and cobalt ions serves as a degradation accelerant, a bio-based plasticizer and the like are combined, and the composite material is prepared through a twin-screw extrusion melt blending and supercritical fluid foaming technology.

A foam-forming composition may include (a) at least one isocyanate component; and (b) at least one isocyanate-reactive composition comprising: (i) at least one low molecular weight polyether polyol having an average functionality in the range of from 2 to 8 and a hydroxyl equivalent weight in the range of from 30 Da to 450 Da; (ii) at least one EO-terminated high molecular weight polyether polyol, the at least one EO-terminated high molecular weight polyether polyol having an average functionality in the range of from 2 to 8 and a hydroxyl equivalent weight in the range of from 1500 Da to 10,000 Da; and (iii) optionally, at least one high molecular weight polyether polyol having an average functionality in the range of from 1 to 8 and a hydroxyl equivalent weight in the range of from 800 Da to 10,000 Da wherein (ii) is present at a weight percent (wt%) of the sum of the polyols in the isocyanate reactive composition in the range of from 25 wt% to 75 wt%; (c) a catalyst package comprising at least one latent gelling catalyst; and (d) at least one blowing agent; wherein the foam-forming composition has an isocyanate index of from 60 to 300, and the foam has a molded foam density of from 250 kg / m3 to 750 kg / m3 according to ASTM D1622-20.

The present invention provides a two-component composition that suppresses dripping during spray application, has high thermal insulation properties, excellent smoothness, and high interlayer adhesion strength for spray-applied polyurethane foam roofing. [Solution] A two-component composition for spray-applied polyurethane foam for roofs, comprising: liquid A containing a polyol, a catalyst, and a blowing agent; and liquid B containing an isocyanate compound, wherein the catalyst includes a foaming catalyst and a resinification catalyst (excluding a metal catalyst), and the blowing agent includes a hydrochlorofluoroolefin and does not include the metal catalyst which is the resinification catalyst, or a trimerizing catalyst.

The application provides a light EVA composite chemical foaming sole material with a bimodal cell structure and a preparation method thereof, and the method comprises the following steps: S1, 50-70 parts of ethylene-vinyl acetate, 10-25 parts of polyolefin thermoplastic elastomer, 20-40 parts of low-molecular-weight thermoplastic elastomer, wear-resistant agent and active agent are mixed, melt homogenization granulation is carried out, and a first material is obtained; the low-molecular-weight thermoplastic elastomer is selected from one or more of polyurethane elastomer, polyester elastomer and polyamide elastomer; S2, the first material, a chemical foaming agent and a crosslinking agent are mixed and then granulated to obtain a second material; S3, the second material is subjected to injection pressure holding and temperature reduction foaming; and S4, the small foaming semi-finished product obtained is subjected to secondary mold pressing to obtain the light EVA composite chemical foaming sole material. The foaming sole prepared by the application has the characteristics of low specific gravity, high resilience and small shrinkage, the physical properties are controllable, and the market prospect is good.