1215 results about "Ethylene oxide" patented technology

The invention relates to a flame-retardant inorganic quick-setting material and a preparation method thereof, and the flame-retardant inorganic quick-setting material is prepared from the following raw materials: sulphoaluminate cement, aluminum-magnesium hydrotalcite, phosphorus slag powder, waste PBO fiber, an accelerator, a water reducer, a functional auxiliary agent, and 3, 3 '-diamino-4, 4'-difluorodiphenyl sulfone. The functional auxiliary agent comprises structural units introduced by the following monomers: 3-[N, N-dimethyl-[2-(2-methylpropyl-2-enoyloxy) ethyl] ammonium] propane-1-sulfonic acid inner salt, diphenyl (4-vinyl phenyl) phosphine oxide, 1, 3-bis (oxirane methyl)-5-(2-allyl)-1, 3, 5-triazine-2, 4, 6 (1H, 3H, 5H)-triketone, 10-(4-vinyl phenyl)-10H-phenoxazine and itaconic acid. The material is high in strength, remarkable in rapid hardening and flame-retardant effect, and safe and environment-friendly to use.

The invention relates to a catalyst for ethylene oxide ring-opening polymerization and a preparation method thereof, and belongs to the technical field of high polymer material synthesis, and the catalyst is a composite structure based on a silicon dioxide nanoparticle loaded bimetal organic complex; a modified nitrogen-containing polydentate ligand is prepared by adopting a special method, is coordinated with metal ions through covalent bonds and is loaded on silicon dioxide nanoparticles; by utilizing the high dispersity and stability of the silicon dioxide nanoparticles and the synergistic catalytic effect of the bimetal organic complex, the catalytic effect is effectively improved, the polymerization process is accelerated, the polymerization stability is enhanced, the polymerization molecular weight is improved, and the distribution is narrow.

The invention relates to the technical field of adhesives, and discloses a weather-resistant transparent adhesive, a preparation method and application of the weather-resistant transparent adhesive to adhesion of a weather-resistant and wear-resistant transparent film and a color-coated sheet. The preparation method of the weather-resistant transparent adhesive comprises the following steps: reacting 4-(2, 3-ethylene oxide) benzaldehyde with tetrakis (3-mercaptopropionic acid) pentaerythritol ester to obtain an intermediate product A; reacting the intermediate product A with 4, 5-diaminobenzene-1, 2-diphenol to obtain an intermediate product B; preparing nano zinc oxide, performing surface modification on the nano zinc oxide, and grafting the intermediate product B to obtain an organic-inorganic hybrid curing agent; modifying epoxy resin by using the composite modifier to obtain modified epoxy resin; the modified epoxy resin, the organic-inorganic hybrid curing agent and the accelerant are mixed and stirred, and the weather-resistant transparent adhesive is obtained; the weather-resistant transparent adhesive disclosed by the invention is high in transparency and has excellent mechanical strength, toughness, adhesiveness and weather resistance.

The invention discloses a polyethylene glycol-poly (2-vinyl) ethylene glycol copolymer and a preparation method thereof, and relates to the technical field of high polymer materials, and the structure of the polyethylene glycol-poly (2-vinyl) ethylene glycol copolymer is selected from any one of the following structural formulas: # imgabs0. The preparation method comprises the following steps: taking hydroxyl-containing polyethylene glycol and 4-vinyl-1, 3-dioxocyclopent-2-ketone or vinyl ethylene oxide as raw materials; under the action of a palladium catalyst and a phosphine ligand, the polyethylene glycol-poly (2-vinyl) glycol copolymer is efficiently prepared and can be used in the fields of hydrophilic / hydrophobic materials, drug carriers, antibacterial materials, phase change materials, shape memory materials and the like.

The invention provides a large-aperture alumina carrier as well as a preparation method and application thereof. The large-aperture alumina carrier is prepared from dry materials and water, and the dry materials comprise inert fibers, aluminum hydroxide and ammonium aluminum carbonate. According to the invention, under the condition of low water-powder ratio, primary pores and secondary accumulation pores in aluminum hydroxide and ammonium aluminum carbonate are reserved to the greatest extent under high extrusion pressure in the carrier extrusion and molding process due to the enhancement effect of inert fibers; although the apertures of the primary pores, the secondary accumulation pores and the macropores generated by decomposition of the ammonium aluminum carbonate are reduced during roasting of the carrier, the volume ratio of the pores with the pore size of more than 500nm in the final carrier is still obviously increased due to the existence of the inert fibers, and the volume ratio of the pores with the pore size of more than 500nm is 15-25%. In addition, the by-product ammonium aluminum carbonate generated in the recovery process of the waste ethylene oxide catalyst is used as the raw material and the macroporous pore-enlarging agent, so that the production cost of the large-aperture alumina carrier is reduced. The prepared large-aperture alumina carrier can be used for preparing a residual oil hydrodemetallization catalyst.

The invention discloses quick-dry water-based ink and a preparation method thereof, and relates to the technical field of ink. The preparation method comprises the following steps: firstly, enabling 4, 6-bis (allyloxy)-n-butyl-1, 3, 5-thiazine-2-amine and vinyl sulfonamide to participate in a polymerization reaction of acrylic acid and butyl acrylate, and preparing 4, 6-bis (allyloxy)-n-butyl-1, 3, 5-thiazine-2-amine and vinyl sulfonamide through a two-step emulsion polymerization method; the core-shell structure modified polyester emulsion with 2, 5-thiazine-2-amine and vinyl sulfonamide as soft shells and acrylic acid and butyl acrylate as hard cores improves the wear resistance and durability of the ink. Then allyl polyether reacts with 2-(p-chlorphenyl) ethylene oxide, so that the drying time is shortened, and the wear resistance of the ink is improved; then through addition reaction of reactants, bis (2-ethoxyl) dimethyl ammonium chloride and hydrogen-containing silicone oil, the epoxy-amino-polyether combined modified silicone oil flatting agent is formed, the flatting agent has hydrophilicity and hydrophobicity, the drying speed is increased, and the wear-resistant effect is improved.

The invention discloses a cellulose coated diaphragm and a preparation method thereof in the field of lithium ion batteries, the diaphragm comprises alpha-cellulose pulp, a cellulose grafted phenylboronic acid-co-oligomeric ethylene oxide copolymer, a thermal response star zwitterionic polymer and nano aluminum oxide, and an N-methylmorpholine-N-oxide aqueous solution is adopted as a solvent system. The preparation method comprises the following steps: firstly synthesizing a cellulose grafted copolymer with dynamic borate bonds through atom transfer radical polymerization, then preparing a star polymer with thermal response arms and zwitter-ion terminals by taking cyclodextrin as a core, and finally mixing all the components to prepare coating slurry. And the composite diaphragm is prepared through the processes of coating, phase conversion, ultraviolet curing and drying. The diaphragm combines the thermal stability and lyophilic property of cellulose, forms a dynamic self-adaptive interface layer through the synergistic effect of two functional compounds, has the advantages of active safety protection, dendritic crystal inhibition, long cycle life and the like, and remarkably improves the comprehensive performance of the lithium ion battery.

The invention provides a system and a method for producing high-purity electronic-grade carbonic ester, and the system comprises a heterogeneous reaction section, a separation section and a crystallization section along the material flow direction, the heterogeneous reaction section is used for carrying out heterogeneous reaction on ethylene oxide and carbon dioxide to prepare carbonic ester; the separation section is used for separating materials from the heterogeneous reaction section and comprises a flash evaporation unit and a rectification unit in the material flow direction, and the flash evaporation unit comprises at least one flash evaporation tank; the rectification unit comprises at least one rectification tower, and the side-draw of the rectification unit is communicated with the feed port of the crystallization section; and the crystallization section is used for crystallizing and purifying the material mainly containing carbonic ester from the separation section. According to the method, high-purity ethylene carbonate used as a power battery can be obtained from the crystallization section, and crystallization mother liquor can be selectively returned to the separation section to be concentrated. The method can effectively improve product purity, reduce product chromaticity and reduce energy consumption, and can be applied to industrial production of carbonic ester.

To provide a composition for oil or gas well formation, and a method of producing the composition, and a method of forming an oil or gas well.SOLUTION: Provided is a composition for an oil or gas well formation, containing a viscoelastic surfactant and a modified nanomaterial. The modified nanomaterial optionally contains a nanocellulose. The modified nanomaterial optionally has, on its surface, a sulfate group, a sulfite group, a carboxy group, an ethylene oxide chain, an amino group, an ester group, a silane group, a tertiary ammonium group or a mixture thereof.SELECTED DRAWING: None

The invention relates to the technical field of battery solid electrolyte, in particular to a method for constructing polyethylene oxide-based composite solid electrolyte by sub-nanowires. According to the specific technical scheme, the method comprises the following steps: (1) sub-nanowire surface grafting modification: dispersing sub-nanowires in a weak polar solvent, then adding a sulfhydryl compound and a photoinitiator, and reacting for 4-10 hours under the conditions of ultraviolet irradiation and ice bath; and (2) construction of the composite solid electrolyte: dissolving polyethylene oxide, a lithium salt and the sub-nanowire modified in the step (1) in a polar solvent, uniformly stirring, casting to form a film, and drying at normal temperature. According to the invention, the problems of poor filler dispersity, low size matching degree, insufficient interfacial compatibility and the like in the traditional composite electrolyte are solved.

The invention discloses an impact-resistant industrial coating and a manufacturing method thereof, and relates to the technical field of industrial coatings. The impact-resistant industrial coating comprises the following raw materials in parts by weight: 80-100 parts of epoxy resin, 2-5 parts of graphene oxide, 3-5 parts of an antistatic agent, 5-8 parts of a modified thickener, 1-3 parts of a dispersant, 0.5-1.5 parts of a leveling agent, 2-3 parts of an antioxidant, 8-12 parts of a curing agent and 100-140 parts of deionized water. The preparation method comprises the following steps: reacting polyethylene glycol diethylene oxide methyl ether with 2-(methacrylic acid) ethyl ester 3, 5-diaminobenzoic acid to generate a polymer; reacting the polymer with 3-(dimethylamino)-1-propanethiol to generate a tertiary amine-terminated polymer; and carrying out quaternization reaction on the tertiary amine-terminated polymer and bromododecane to obtain the antistatic agent. The impact-resistant industrial coating prepared by the invention has excellent antistatic property and rheological property.

In an embodiment, a polyurethane comprises the residues of i. an aliphatic diisocyanate, ii. an aliphatic diol comprising a poly(ethylene oxide) moiety, iii. an aliphatic diol comprising a polycarbonate moiety, and iv. a chain extender, wherein the polyurethane has a melting temperature of 140° C. or less and has a weight average molecular weight of from 100,000 to 500,000 g / mol. In an embodiment, the polyurethane is substantially devoid of catalyst. In an embodiment, the polyurethane is formed by reactive extrusion. In an embodiment, a medical device comprises the polyurethane and a bioactive agent. The medical devices, methods, and polyurethanes may exhibit benefits in end-product biostability, drug release profile, health and safety, and processing speed or reproducibility.

The invention belongs to the field of chemistry and chemical engineering, and discloses a method for preparing high-purity 1, 4-dioxane-2-ketone at low cost. A large amount of high-purity 1, 4-dioxane-2-ketone can be prepared at one time by taking a large amount of glycollic acid or glycollic acid derivatives and ethylene oxide as raw materials and adopting a one-step synthesis process route and a purification mode suitable for industrial production. According to the method, cheap bulk commodities are adopted as raw materials, and high-value conversion of low-value chemicals is achieved; according to the method disclosed by the invention, the 1, 4-dioxane-2-ketone is rapidly synthesized in one step under mild conditions without a catalyst or with a trace amount of a catalyst, so that the synthesis yield of a target product is improved, the reaction steps are greatly shortened, the energy consumption is greatly reduced, and the production cost is obviously reduced.

The invention discloses hydrophobic modified unsaturated polyether for a polycarboxylic acid water reducer and a preparation method thereof, and the preparation method comprises the following steps: mixing vinylphenol substances, an organic amine catalyst and a polymerization inhibitor, under the protection of inert gas, heating to 60-90 DEG C, introducing ethylene oxide gas, and then curing for 10-60 minutes; cooling to 40 DEG C or below, adding a catalyst, heating to 100-130 DEG C under the protection of inert gas, continuously introducing ethylene oxide gas, and then curing for 10-60 minutes; adjusting the pH value of the reaction system to 7-9; unsaturated double bonds in the hydrophobic modified unsaturated polyether are connected with a benzene ring, compared with EPEG polyether, the charge environment of the double bonds is greatly improved, the activity of the double bonds is improved, the dropwise adding time of acrylic acid during synthesis of the polycarboxylate superplasticizer can be greatly shortened, the hydrophobicity of the benzene ring is high, the HLB value of the polyether can be reduced, and the hydrophobic property of the polyether is improved. Therefore, the viscosity of the concrete is reduced.

The invention relates to a method for generating a signal for adjusting a parameter of an ethylene oxide production process, comprising the steps of acquiring (100) process data of the ethylene oxide production process, predicting (200) a future value of the parameter from the process data, comparing (300) the future value with a predefined reference, and generating a signal for adjusting the parameter of the ethylene oxide production process. And generating (400) the signal for adjusting the parameter as a function of the result of the comparison.

It has been discovered that recycle content CO2 streams produced in a chemical recycling facility involving waste plastic pyrolysis can be converted into recycle content syngas (r-syngas), which can be used for various applications. More particularly, recycle content CO2 streams generated from a pyrolysis facility, a cracking facility, and / or an ethylene oxide facility may be recovered and converted into r-syngas. Moreover, recycle content methane, produced directly or indirectly from waste plastics, may also be used to produce flue gas streams, which provide additional recycle content CO2 streams to produce additional recycle content syngas. Thus, methods for producing a useful recycle content product (i.e., r-syngas) from conventional waste streams that are typically exhausted (i.e., CO2 streams) are provided herein.

The invention relates to a preparation method of high-purity o-phenylphenoxyethanol. The preparation method comprises the following steps: S1, reacting o-phenylphenol with ethylene carbonate in the presence of a catalyst to obtain an o-phenylphenoxyethanol crude product; s2, dissolving the o-phenyl phenoxyethanol crude product in an organic solvent; and S3, adding an anti-solvent, cooling and crystallizing to obtain the o-phenylphenoxyethanol. The o-phenylphenoxyethanol obtained by the method is high in purity, namely the HPLC (high performance liquid chromatography) purity is more than or equal to 99.5%, the single impurity is less than or equal to 0.1%, the o-phenylphenoxyethanol can be produced by conventional equipment, the process operation is simple, the production cost is low, an ethylene oxide method can be replaced, and the industrial production is easy.

The invention relates to the technical field of solid-state lithium batteries, in particular to an intercalation type composite solid-state electrolyte as well as a preparation method and application thereof. The preparation method comprises the following steps: carrying out ion exchange, centrifugal washing, freeze drying and other processes on sodium-based montmorillonite to obtain lithiated montmorillonite nanosheets; the preparation method comprises the following steps: adding lithiated montmorillonite nanosheets and polyethylene oxide into N, N-dimethylformamide to obtain slurry A; adding a high-molecular polymer material and lithium salt into N, N-dimethylformamide to obtain slurry B; dropwise adding the slurry A into the slurry B to obtain a precursor solution; and blade-coating the precursor solution on a glass substrate, standing, carrying out vacuum drying, and demolding to obtain the intercalation type composite solid electrolyte. The process is simple, the raw materials are easy to obtain, and the obtained electrolyte has high ionic conductivity, a wide voltage window and excellent mechanical property and flame retardant property.

The invention discloses a benzimidazolyl Gemini surfactant as well as preparation and application of the benzimidazolyl Gemini surfactant. The benzimidazolyl Gemini surfactant is a symmetric gemini type compound formed by a benzimidazole group, a styrene group, a sulfonate group and an alkyl chain with a proper length, and the compound has a better oil displacement effect. The surfactant can also reduce the surface tension of a solution in a dose-dependent manner, has relatively strong interfacial activity, excellent shear restorability and wettability, is beneficial to improving the oil recovery rate, and is suitable for multiple aspects such as an oil-soluble viscosity reducer, an oil-displacing agent and a microemulsion internal phase in tertiary oil recovery. The invention provides a method for preparing a surfactant by sulfonation and neutralization after styryl benzimidazole and alkyl diethylene oxide are subjected to ring-opening reaction to obtain a Gemini intermediate, and the synthetic process route has the characteristics of high product surface activity, excellent rheological property and simple synthetic method.

The utility model relates to the field of ethylene oxide and ethylene glycol production sewage treatment, and discloses a reclaimed water recycling system matched with ethylene oxide and ethylene glycol production, which comprises a reclaimed water regulating tank (31), a hardness removal sedimentation tank (32), an ozone water inlet tank (33), an ozone contact tank (34) and a reclaimed water post-positioned CBR tank (35) which are sequentially connected, and the reclaimed water post-positioned CBR tank (35) is connected with an RO (reverse osmosis) membrane treatment tank (36). Fresh water discharged from the RO membrane treatment tank (36) is recycled to a low-salt wastewater treatment system (10), and concentrated water discharged from the RO membrane treatment tank (36) is connected to an RO concentrated water hardness removal tank (37); the reclaimed water recycling system not only realizes recycling of circulating water in multiple places, but also can cooperate with efficient treatment of low-salt wastewater and efficient treatment of high-salt wastewater to recycle clear water, so that water saving and emission reduction are realized, the operation cost is reduced, and the treatment efficiency is high.

The present disclosure includes hyperbranched polyether polyols, such as hyperbranched poly(3-(oxiran-2-ylmethoxy) propane-1,2-diol) (HPOD), methods for their preparation and uses thereof, for example, as a cryoprotectant, lyoprotectant or stabilizer.

The invention belongs to the technical field of stripping liquid, and particularly discloses water-based photoresist stripping liquid and a preparation method thereof. The water-based photoresist stripping liquid is prepared from the following raw materials in percentage by mass: 10 to 15 percent of quaternary ammonium salt compound, 15 to 25 percent of water-soluble organic solvent, 0.2 to 0.5 percent of alkanolamine substance, 0.03 to 0.05 percent of metal protective agent and the balance of deionized water, the quaternary ammonium salt compound is prepared by the following steps: reacting 6-heptene-1-alcohol with ethylene oxide to obtain a compound 1, carrying out amidation reaction on allyl glycidyl ether and dimethylamine to obtain a compound 2, and carrying out chlorination reaction on sodium 2-chloroethanesulfonate and the compound 2 to obtain a compound 3; and finally polymerizing the compound 1 and the compound 3 under the initiation action of azodiisobutyronitrile. All the components in the stripping liquid have a synergistic effect, so that the photoresist is effectively stripped, and the stripping liquid is free of residues, more efficient and good in corrosion-resistant effect.

The invention discloses a double-phase-change flexible film for solar power generation and a preparation method of the double-phase-change flexible film. According to the method, water-soluble polymers such as polyvinyl alcohol, polyvinylpyrrolidone, polyethylene oxide and the like are used as flexible base materials and are physically blended with vanadium dioxide, freeze drying is performed, then phase change heat storage materials such as fatty acid, alkane, polyethylene glycol, paraffin and the like are subjected to vacuum impregnation adsorption, and the double-phase-change flexible film for solar power generation is synthesized. The double-phase-change flexible film synthesized by the method can realize double phase change in the same phase change temperature zone, has a selective intelligent reflection function on near-infrared light before and after phase change, and has relatively high photo-thermal conversion efficiency, and the synthesis method is simple, safe and easy to prepare. Wide application prospects are realized in the aspects of solar power generation, electronic device heat management, intelligent infrared stealth and the like.

The present invention discloses a kind of ultrafine slag powder grinding aid and preparation method thereof, belong to the technical field of grinding admixture. The grinding aid of the present invention is prepared by including the following raw materials in parts by weight: 20-40 parts of small molecule polyether polyols, 10-20 parts of ethylene glycol and diethylene glycol mixed solution, 5-10 parts of water glass, 0.1-0.5 parts of sodium hexadecylsulfonate, 0.1-0.5 parts of defoamer and 20-40 parts of water. The present invention adopts ethylene oxide and glycolic acid to synthesize small molecule polyether polyol oligomers, which can adapt to slag of different particle sizes, achieve good adsorption and dispersion, effectively solve the agglomeration problem of slag differential during ultrafine grinding, and have a good grinding aid effect on slag. The obtained grinding aid can effectively improve the efficiency of ultrafine grinding of slag powder, shorten the time of ultrafine grinding, and increase the output by 20% per hour.

The invention relates to a renewable industrial flue gas carbon dioxide adsorbent and a preparation method thereof. The method comprises the following steps: S1, mixing alkali metal, an aluminum oxide precursor, silicon oxide and a first solvent, or mixing an alkali metal solution, the aluminum oxide precursor, the silicon oxide and an optional second solvent, and then molding the mixed material to obtain microsphere particles; s2, mixing the microsphere particles and organic amine, and carrying out first loading treatment and drying treatment to obtain an organic amine loaded material; s3, roasting the organic amine-loaded material, mixing the obtained roasted material with a carrier material, and carrying out second loading treatment, so as to obtain the carbon dioxide adsorbent, the carrier material is selected from at least one of polystyrene-polyacrylic acid-polyethylene oxide, polymethyl methacrylate-b-polystyrene, zirconium oxide and a porous ceramic material. The carbon dioxide adsorbent is relatively high in adsorption capacity and relatively good in selectivity, reproducibility and stability; and large-scale industrial production and application are facilitated.

The present invention relates to liquid aqueous detergent compositions comprising a surfactant system comprising a primary surfactant being anionic surfactant, a secondary surfactant being amphoteric surfactant and polyethylene oxide whilst the surfactant system is free of alkylbenzene sulphonates and derivatives thereof. The invention further relates to a method of cleaning a stainless-steel hard surface using the composition of the invention, as well as the use thereof.

The invention discloses an ethylene oxide detection and analysis method, which belongs to the technical field of detection and analysis, and comprises the following steps: weighing a sample to be detected, adding deuterated internal standard ethylene oxide-D4, and dissolving the sample with a low-temperature mixed solvent to obtain a sample solution; uniformly mixing the sample solution, adding a purifying material for purifying, uniformly mixing and centrifuging to obtain supernate; putting a part of the supernate into a small solid-phase microextraction bottle, adding sodium chloride, and uniformly mixing to obtain a solution to be detected; placing the small solid-phase microextraction bottle filled with the solution to be detected on a gas chromatograph-tandem mass spectrometer with a CTC automatic solid-phase microextraction sampling device, and extracting and detecting the prepared solution to be detected; and analyzing the data acquired by the mass spectrum by utilizing Agilent MassHunter data processing software. According to the method, volatile components in a sample are enriched, concentrated and then detected, the residual amount of ethylene oxide in the fat-soluble plant extract can be directly and quantitatively analyzed, the sensitivity is high, and the accuracy is good.

The invention relates to the field of daily chemical industry, and in particular to a low-foam machine washing composition based on a modified non-ionic surfactant and a preparation method thereof. The low-foam machine washing composition comprises the following components by mass percentage: 1% to 20% of a non-ionic surfactant, 1% to 10% of a bacteriostatic agent, 0.1% to 15% of a chelating agent, 0.1% to 10% of a cosolvent, 0.1% to 10% of an auxiliary agent, and the remainder of water; the non-ionic surfactant is a fatty alcohol block polyether obtained by successively adding fatty alcohol to ethylene oxide and then reacting with ethyl chloride to introduce a branched chain structure; the polymer compound has extremely low foam, with a foaming force of less than 8mm, and can produce a synergistic effect after being compounded with a chelating agent, a bacteriostatic agent and other components, thereby helping to significantly reduce the foaming force of the cleaning composition, while further enhancing the stability and bacteriostatic performance of the product, and effectively improving the product performance.

The invention provides a composite surfactant for oil displacement of a hypersalinity oil reservoir and a preparation method of the composite surfactant, and relates to the technical field of petrochemical engineering. The composite surfactant is prepared from the following components in percentage by weight: 0.1 to 0.3 percent of anionic-nonionic surfactant, 0.01 to 0.03 percent of cationic surfactant and the balance of formation water, wherein the anionic-nonionic surfactant is prepared by the following steps: reacting a hydroxyl-containing compound with ethylene oxide to obtain polyoxyethylene ether, then carrying out esterification modification by using aconitic acid modified rosin, then sulfonating by using a sulfonating agent, and finally neutralizing. The composite surfactant shows relatively low interfacial tension under the condition of hypersalinity (50000-200000 mg / L), is high in stability, and can be used for improving the recovery efficiency of hypersalinity oil reservoirs.

The present invention provides a raw material composition suitable for producing rigid isocyanurate foams that exhibit both excellent energy absorption and sound absorption properties, while also exhibiting excellent foam moldability, appearance, and breathability. The raw material composition for rigid isocyanurate foams of the present invention contains a polyol composition and a polyisocyanate. The polyol composition includes: a tri- or higher functional polyether polyol (C) having a hydroxyl value of 300 mgKOH / g or more; a polyether polyol (A) different from the polyether polyol (C) and having an ethylene oxide content of 50 mass% or more, based on the total amount of alkylene oxide in the polyether polyol (A); and a polyether polyol (B) different from the polyether polyol (C) and having an ethylene oxide content of 10 mass% or less, based on the total amount of alkylene oxide in the polyether polyol (B). The raw material composition has an isocyanate index of 105 or more and 400 or less. The content of component (A) is 30 parts by mass or more and 50 parts by mass or less, and the content of component (C) is 5 parts by mass or more and 35 parts by mass or less, based on 100 parts by mass of the total amount of the raw material composition excluding the polyisocyanate.