494 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 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 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 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 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.

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 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 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.

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.

The invention discloses a modified polymer cement-based normal-temperature foaming fireproof coating and a preparation method thereof, and relates to the technical field of fireproof coatings. The modified polymer cement-based normal-temperature foaming fireproof coating comprises a component A and a component B, the component A is prepared from the following raw materials in parts by weight: 15 to 20 parts of cement, 10 to 12 parts of calcium carbonate, 0.3 to 0.9 part of nano titanium dioxide, 30 to 35 parts of polyurethane emulsion, 1 to 2 parts of cross-linking agent, 8 to 12 parts of flame retardant, 1 to 3 parts of foaming agent, 0.5 to 1.5 parts of dispersing agent and 10 to 20 parts of deionized water; the component B comprises the following raw materials in parts by weight: 20-25 parts of a curing agent, 0.1-0.5 part of an organic zinc catalyst and 0.5-1.2 parts of a foam stabilizer; the prepared modified polymer cement-based normal-temperature foaming fireproof coating has excellent fireproof performance, bonding strength and compressive strength.

The application relates to a high-damping and low-creep composite foaming material for gymnastics mats and a preparation process thereof, and relates to the field of polymer materials and preparation thereof. The preparation raw materials comprise the following components in mass fractions: ethylene-octene copolymer 60-70 parts, thermoplastic vulcanized rubber 15-25 parts, nano reinforcing filler 4-8 parts, maleic anhydride grafted ethylene-octene copolymer 5-9 parts, composite foaming agent 2-4 parts, crosslinking agent 1-2 parts, and antioxidant 1-1.5 parts. The preparation process comprises the following steps: melting and blending ethylene-octene copolymer, thermoplastic vulcanized rubber and maleic anhydride grafted ethylene-octene copolymer, adding nano reinforcing filler, mixing and kneading, then adding crosslinking agent, composite foaming agent and antioxidant, mixing and kneading, discharging and obtaining a sheet, crosslinking and foaming the sheet, releasing pressure after pressure maintaining, cooling and opening the mold, and obtaining the high-damping and low-creep composite foaming material for gymnastics mats. The application has the effects of improving the material collapse resistance, buffering performance and comfort performance.

A pellet includes a starch in an amount of approximately 50 to 98 weight percent, a plasticizer in an amount of approximately 2 to 25 weight percent, water in an amount of approximately 1 to 40 weight percent, and a blowing agent in an amount approximately 1 to 25 weight percent. The pellet may have a density of approximately 20 to 65 pounds per cubic foot. The blowing agent may include sodium bicarbonate and / or ammonium bicarbonate.

Disclosed herein is a method of reprocessing a thermoset polyurethane foam. The method includes mixing polyurethane foam particles loaded with a bond exchange catalyst with a blowing agent and compounding the mixture. The method includes machining a polyurethane foam into particles; loading the particles with a bond exchange catalyst, thereby preparing loaded particles; mixing the loaded particles with a blowing agent; compounding the mixture of the loaded particles and the blowing agent, thereby preparing a compound; and extruding the compound.

The present invention relates to tannin-based heat-expandable microspheres, and also to a process for their preparation. The heat-expandable microspheres comprise a thermoplastic shell surrounding a hollow core, wherein the hollow core comprises a blowing agent, and the thermoplastic shell comprises tannin.

The invention discloses hot-pressed traceless high-elastic synthetic leather and a preparation method and application thereof, and belongs to the technical field of synthetic leather. The hot-pressed traceless high-elastic synthetic leather comprises a surface layer, a high-elastic foaming middle layer and a base cloth layer; the surface layer is a microporous elastic film layer formed by blending and drying waterborne polyurethane, a thermoplastic polyurethane elastomer and matting powder; the high-elastic foaming middle layer is a three-dimensional net structure layer formed by hot-pressing foaming, and the high-elastic foaming middle layer is prepared from the following raw materials in parts by weight: 100 parts of high-molecular-weight aromatic thermoplastic polyurethane elastomer particles; 3-8 parts of a foaming agent; 0.5 to 2 parts of a foaming aid; 5 to 15 parts of elastomer; the foaming ratio of the high-elastic foaming middle layer is 1.5-4 times of the original thickness, and the bonding interface of the high-elastic foaming middle layer and the base cloth layer is of a random three-dimensional interpenetrating structure; the base cloth layer is a high-elasticity warp-weft knitted fabric with warp-wise and weft-wise elastic recovery rates greater than 85%; the invention discloses synthetic leather which is traceless in hot pressing, high in elasticity and firm in interlayer combination.

The invention relates to the field of foaming materials, in particular to a fireproof polyurethane foaming material and a preparation method thereof.The preparation method comprises the following steps that S1, polyisocyanate and an inorganic flame retardant are taken and added into one mixing box of a preparation device to be premixed, and a mixture A is obtained; s2, polyhydric alcohol and a foaming agent are taken and added into another mixing box of the preparation device to be premixed, and a mixture B is obtained; s3, the mixture A and the mixture B are fed into an extrusion box to be mixed and extruded into a forming cavity of a mold to be subjected to foaming forming; and S4, the multiple molds are driven to sequentially and circularly move, materials are sequentially extruded into the forming cavities of the multiple molds for foaming forming, meanwhile, the foaming forming materials in the forming cavities of the molds are sequentially and automatically discharged, and continuous preparation of the foaming materials is formed. The foam material is continuously prepared through the mold, and the preparation efficiency is improved.

The application discloses a kind of low-noise water disaster resistant asphalt mixture and preparation method thereof, it is related to bitumen technical field.The mixture is composed of modified basalt porous ceramic hybrid aggregate and self-repairing gel modified asphalt material composite;Among them, modified basalt porous ceramic hybrid aggregate is crushed after basalt ore, by the synergistic effect of foaming agent, cosolvent, in the vacuum gradient sintering, carbon dioxide is inhaled to optimize pore structure, then by pickling, plasma activation and polyurethane impregnation strengthen mixed aggregate and filler are prepared;Self-repairing gel modified asphalt is three (2-mercaptoethyl) cyanuric acid ester as precursor, by thiol-epoxy click chemistry reaction to form crosslinked gel network, then with matrix asphalt composite;The scheme is through the acoustic wave dissipation of porous ceramic, hydrophobic interface and the dynamic self-repairing synergistic effect of gel network, significantly improve the water disaster resistance and noise reduction performance of mixture.

To provide a urethane resin composition that can give a polyurethane foam having excellent incombustibility.SOLUTION: A urethane resin composition contains a polyol compound, a polyisocyanate compound, a flame retardant, a foamer, and a catalyst. When a polyurethane foam comprising the urethane resin composition is subjected to a cone calorimeter test in accordance with the ISO-5660 test method, the gross calorific value X up to 0-1200 seconds is 8 MJ / m2 or less, while the gross calorific value Y up to 0-60 seconds is less than 30% of the gross calorific value X up to 0-1200 seconds.SELECTED DRAWING: None

Intumescent composition comprising an acid donor (A), a carbon donor (B), a binder polymer (C) and a blowing agent (D). The acid donor (A) is selected from the group consisting of ammonium polyphosphate, ammonium dihydrogen phosphate, ethylenediamine phosphate, ammonium pentaborate, guanylurea phosphate, diguanidine phosphate and mixtures thereof. The carbon donor (B) is selected from the group consisting of glucose, arabinose and other monosaccharides, lactose, maltose and other disaccharides, starch, cellulose, dextrin and other polysaccharides, sorbitol, erythritol, pentaerythritol, dipentaerythritol, mannitol and other polyhydric alcohols and mixtures thereof. The blowing agent is provided in the form of microsphere particles comprising a thermoplastic polymer shell encapsulating a propellant, which microsphere particles are expandable microspheres.

The invention relates to a composition for producing polyurethane foams, comprising (A) a polyol component, (B) a polyisocyanate component, (C) at least one catalyst that catalyzes isocyanate-polyol reactions, isocyanate-water reactions and / or isocyanate trimerization, (D) at least one foam stabilizer, (E) at least one chemical and / or physical blowing agent, (F) at least one solid, wherein the at least one foam stabilizer is selected from the group of polyether siloxanes of a general average composition according to Formula 1: MaMb1DcDd1.

A method for producing polyolefin-based resin expanded beads includes dispersing polyolefin-based resin particles in an aqueous medium, adding a physical blowing agent into a sealed container, and expanding the resin particles by impregnating the resin particles with the physical blowing agent in the sealed container, then releasing the resin particles from the sealed container together with the aqueous medium to produce expanded beads having an apparent density of 10 to 80 kg / m3. The physical blowing agent includes a hydrofluoroolefin. An addition amount of the hydrofluoroolefin is 10 to 30 parts by mass with respect to 100 parts by mass of the resin particles.

This disclosure relates to a superabsorbent polymer and a method for preparing the same. More specifically, this disclosure relates to a superabsorbent polymer having reduced extractable content without degrading absorption performance, and a method for preparing the superabsorbent polymer by polymerization in the presence of a foaming agent and a carboxylic acid additive with a specific structure.