37 results about "Ethyl vinyl ether" patented technology

The application discloses an indoor moisture-proof and water-resistant gypsum board and a preparation method thereof, and belongs to the technical field of gypsum board preparation. The preparation method of the indoor moisture-proof and water-resistant gypsum board comprises the following steps: S1, uniformly mixing building gypsum, modified fluorite gypsum, deionized water, a polyester adhesive, a composite water reducing agent, blast furnace slag powder and the like to obtain a gypsum slurry; S2, paving the gypsum slurry on a first layer of cover paper, paving a second layer of cover paper on the gypsum slurry, and performing compaction, final setting, drying and solidification to obtain the indoor moisture-proof and water-resistant gypsum board. The composite water reducing agent is obtained by the reaction of ethyl vinyl ether, trichlorofluoroethylene and allyltrimethoxysilane. The polyester adhesive is obtained by the reaction of allyl alcohol, phthalic anhydride and triallyl cyanurate. The prepared gypsum board not only has good moisture-proof and water-resistant performance, but also has good mechanical properties, thereby prolonging the service life and ensuring the quality of the gypsum board to a certain extent.

The invention relates to the technical field of oral care materials, and particularly discloses macromolecular hydrogel-based false tooth safety paste and a preparation method thereof. The macromolecular hydrogel-based denture safety paste is prepared from the following components in parts by weight: 10 to 20 parts of white oil, 20 to 40 parts of vaseline, 40 to 60 parts of polydopamine modified polyvinyl alcohol-based hydrogel, 20 to 40 parts of sodium carboxymethyl cellulose, 20 to 40 parts of methyl vinyl ether-maleic anhydride copolymer calcium sodium salt, 0.1 to 1 part of silicon dioxide, 0.1 to 1 part of 93 to 98 percent ethanol, 0.05 to 1 part of preservative, 0.1 to 2 parts of essence and 0.001 to 0.01 part of pigment. The polydopamine modified polyvinyl alcohol-based hydrogel is prepared from polyvinyl alcohol, dopamine hydrochloride, an activating agent, a coupling agent and poloxamer. According to the technical scheme provided by the invention, the prepared false tooth fixing paste has excellent properties of good bonding effect and strong durability.

A method to manufacture a test strip for measuring specific gravity of a urine sample, the method including successively providing a polyelectrolyte in a first solution, the polyelectrolyte being poly(methyl vinyl ether-alt-maleic anhydride), adding to the first solution a base to neutralize the polyelectrolyte and to bring the first solution at a pH between 10 and 11, adding to the first solution a buffering agent to bring and maintain the first solution at a pH between 7.0 and 7.5, dipping a paper strip into the first solution, and dipping the paper strip into a second solution comprising a pH sensitive color indicator.

The application relates to the field of polishing processing materials for metal pieces, and particularly discloses a fluid material for polishing metal pieces and a preparation method thereof. The fluid material for polishing metal pieces is prepared from the following raw materials in parts by weight: 20-30 parts of hydroxyl-terminated polydimethylsiloxane, 42-50 parts of abrasive, 18-28 parts of ethanol, 5-8 parts of a lubricating stabilizer, and 2-4 parts of a methyl vinyl ether / maleic anhydride copolymer. The preparation method comprises the following steps: the lubricating stabilizer and the methyl vinyl ether / maleic anhydride copolymer are added into the ethanol and stirred and dispersed, the hydroxyl-terminated polydimethylsiloxane and the abrasive are added and heated and kneaded and dispersed, and vacuum defoaming is performed. The fluid material prepared by the application is applied to polishing of metal pieces, has good temperature resistance and viscosity stability during the polishing process, the polished metal piece surface has good uniformity, the problem that the fluid material is prone to local non-uniformity or scratches during the polishing process is solved, and the polishing efficiency is improved.

The invention discloses an indoor moisture-proof and water-resistant gypsum board and a preparation method thereof, and belongs to the technical field of gypsum board preparation. The preparation method of the indoor moisture-proof and water-resistant gypsum board comprises the following steps: S1, uniformly mixing building gypsum, modified fluorgypsum, deionized water, a polyester adhesive, a composite water reducing agent, blast furnace slag powder and the like to obtain gypsum slurry; s2, the gypsum slurry is flatly laid on the first layer of surface protection paper, the second layer of surface protection paper is flatly laid on the gypsum slurry, compaction, final setting and drying curing are conducted, and the indoor damp-proof and water-resistant gypsum board is prepared; wherein the composite water reducing agent is obtained by carrying out a reaction on ethyl vinyl ether, trichlorofluoroethylene and allyl trimethoxy silane; the polyester adhesive is obtained by reaction of allyl alcohol, phthalic anhydride and triallyl cyanurate; the prepared gypsum board not only has good moisture-proof and water-resistant performance, but also has good mechanical performance, the service life of the gypsum board is prolonged to a certain extent, and meanwhile the quality of the gypsum board is guaranteed.

The application belongs to the technical field of sodium ion battery materials, and particularly relates to a sodium ion battery water-based binder and a positive electrode slurry thereof. Poly[(methyl vinyl ether)-(maleic acid)] is hydrolyzed in a sodium hydroxide solution, and poly[(methyl vinyl ether)-(sodium maleate)] is obtained after vacuum drying, which is used as a water-based binder for a sodium ion battery positive electrode. The water-based binder has both high-polarity groups and low-polarity groups, thus solving the problem of easy settlement of conductive carbon in the water-based binder, ensuring high adhesion between components, and enhancing the volume expansion relief and repair capacity of the water-based binder during the charging and discharging process of the positive electrode sheet compared with PVDF and other binders. In general, the water-based binder has strong adhesion, repair force and interface adaptability, is environment-friendly and low in cost, and can make P2-Na x The MO2 positive electrode material has good energy density and stable cycle characteristics when used in a sodium ion battery.

This invention discloses a durable superhydrophobic PFA coating, its preparation method, and its application. Belonging to the field of coating processing and functional material surface modification technology, it grafts γ-aminopropyl groups onto the surface of nanoparticles using a silane coupling agent KH550. These γ-aminopropyl groups are transformed into positively charged ammonium ions in an acidic environment. The repulsion between these ions with the same charge inhibits the aggregation of homogeneous particles, thus fundamentally solving the problem of easy detachment of nanoparticles within the coating. Furthermore, by grafting perfluorinated long chains onto the nanoparticle surface using fluorosilanes, surface energy is reduced, improving the hydrophobicity of the particles. Simultaneously, the similarity and similarity solubility between the long fluorocarbon chains and the PFA coating eliminate interfacial cracks, making it difficult for nanoparticles to peel off when the surface is subjected to friction. The coating prepared by this invention can provide excellent droplet bounce enhancement and droplet adhesion inhibition properties, and is expected to be applied in the field of low-temperature anti-icing.

According to the preparation method of the chlorogenic acid-methotrexate soluble microneedle, chondroitin sulfate and a methyl vinyl ether-maleic anhydride copolymer are adopted as matrix materials, and the drug-loaded microneedle is prepared through a two-step centrifugation method. The length of a needle body of the prepared microneedle is about 500 microns, the microneedle has good mechanical strength and skin puncture performance, the microneedle can be basically dissolved within 2 hours, the average drug content of chlorogenic acid is 57.97 + / -1.76 mu g / tablet, and the average drug content of methotrexate is 56.32 + / -1.67 mu g / tablet. An in-vitro percutaneous penetration test shows that the 6-hour cumulative transdermal rate of chlorogenic acid reaches 93.96%, the 6-hour cumulative transdermal rate of methotrexate reaches 86.92%, which are respectively 22.1 times and 3.0 times that of a control solution group, so that the efficient percutaneous delivery of the medicine is realized. The microneedle is small in skin irritation, the skin barrier can be naturally repaired within 15 minutes after puncture, and a new administration approach is provided for treatment of skin diseases such as psoriasis.

A tetrafluoroethylene-propylene copolymer with a solidification point monomer is mixed with a five-membered copolymer of vinylidene fluoride (VDF), hexafluoropropylene (HFP), tetrafluoroethylene (TFE), perfluorinated methyl vinyl ether (PMVE), and ethylene (PE), using a peroxide as an initiator and an aid TAIC as a crosslinking agent, and the resulting co-solidified fluoroelastomer shows improved curing performance, improved mechanical properties, and improved compression set. The co-solidified fluoroelastomer shows improved chemical resistance to solvent aging systems, and better retention of mechanical properties after high temperature aging in solvent systems.

This invention provides a photoresist diluent composition and its preparation method, belonging to the field of semiconductor photolithography materials technology. The composition includes propylene glycol methyl ether, propylene glycol methyl ether acetate, an interface modifier, and an associative modifier pretreatment solution. The interface modifier is prepared by the acetalization reaction of triethylene glycol monomethyl ether and ethyl vinyl ether, and "can participate in the state regulation of the interface-related regions in the early stage of liquid film formation, and help to mitigate edge flow instability during spin coating." The associative modifier pretreatment solution uses methyl-terminated pentaerythritol polyoxyethylene ether as its core component. Its methyl-terminated polyoxyethylene segments can participate in the regulation of the local microenvironment around the resin, weaken the tendency of strong local effects, and improve the uniform spreading performance of the liquid film under high shear conditions. The two modifiers synergistically regulate coating behavior from both surface and bulk dimensions, helping to improve problems such as uneven film thickness, edge thickening, and coating defects existing in current diluents in advanced processes.

The invention relates to the field of metal part polishing machining materials, and particularly discloses a fluid material for metal part polishing and a preparation method thereof. The invention relates to a fluid material for polishing a metal piece. The fluid material is prepared from the following raw materials in parts by weight: 20-30 parts of hydroxyl-terminated polydimethylsiloxane, 42-50 parts of an abrasive material, 18-28 parts of ethanol, 5-8 parts of a lubrication stabilizer and 2-4 parts of a methyl vinyl ether / maleic anhydride copolymer, the preparation method comprises the following steps: adding the lubrication stabilizer and the methyl vinyl ether / maleic anhydride copolymer into ethanol, stirring and dispersing, adding the hydroxyl-terminated polydimethylsiloxane and the grinding material, heating, kneading and dispersing, and carrying out vacuum defoaming. The fluid material prepared in the invention is applied to metal part polishing, the fluid material has good temperature resistance and viscosity stability in the polishing process, the surface uniformity of the polished metal part is good, the problem that local nonuniformity or scratches are easily generated in the polishing process of the fluid material is solved, and the polishing efficiency is improved.

The present invention relates to phase change material (PCM) compositions comprising an aqueous solution of a salt hydrate phase change material component, one or more polymers, at least one of which is poly(4-styrenesulfonic acid-co-maleic acid), poly(methyl vinyl ether-alt-maleic acid), or polystyrenesulfonic acid, or mixtures of these polymers. The present invention also relates to methods of making PCM compositions comprising these polymers.

The present application relates to a kind of polyamide composite and its preparation method and application, belong to the composition technical field of polymer compound.The polyamide composite of the present application includes the following weight parts of component: polyamide 94~99.7 parts, tackifier 0.2~4 parts, processing aid 0.1~2 parts;The tackifier includes methyl vinyl ether-maleic anhydride copolymer and polytetrafluoroethylene.The polyamide composite has good processing ductility, can make the product prepared have excellent uniformity.

The invention relates to the field of functional composite materials, and discloses a preparation process of an ecological leather fiber velvet composite material and a product. The preparation process of the ecological leather fiber velvet composite material comprises the following steps: S1, needling sea-island fibers to prepare a non-woven fabric; s2, carrying out gum dipping treatment by using a polyurethane gum dipping solution, and drying; s3, decrement splitting, water washing and drying; s4, softening treatment and sanding; s5, soaking with a pretreatment solution, dyeing with a dyeing agent, and drying; the pretreatment liquid in the step S5 contains a dyeing auxiliary agent composed of polydimethyldiallylammonium chloride, a methyl vinyl ether-maleic anhydride copolymer and bis [3-(triethoxysilyl) propyl] amine, and the dyeing agent is an acid dye containing sulfonate. According to the preparation method, through the preparation process of firstly sanding and then dyeing, and optimizing the types of the pretreatment liquid and the dyeing agent, the prepared ecological leather fiber velvet composite material has relatively good dyeing uniformity, color fastness and soft comfort, and the problem of white exposure after abrasion does not occur.

The invention discloses a synthesis method of P-(1-ethoxyethoxy) styrene, which comprises the following steps: S1, reacting 4-acetoxystyrene with alkaline metal salt in an organic solvent system under the protection of inert gas, the reaction time in the S1 is 1-3 hours, the molar ratio of the 4-acetoxystyrene to the alkaline metal salt is 1: (2.2-2.8), and the reaction time in the S2 is 1-3 hours; adjusting the pH value of the reaction liquid, concentrating under reduced pressure, extracting and drying to obtain an intermediate p-hydroxystyrene; s2, in a mixed solvent system of dichloromethane containing a polymerization inhibitor and lower alcohol, p-hydroxystyrene and ethyl vinyl ether react under the catalytic action of pyridinium toluenesulfonate to obtain P-(1-ethyoxyl ethyoxyl) styrene; according to the present invention, the first step reaction is researched, the reaction condition is mild, the energy and the production cost are saved, the reaction time is short, the reaction process is simple, and the yield of the step is improved to be close to 100% so as to improve the total yield of the product.

An inkjet ink composition comprising: 1 to 15% by weight, based on the total weight of the inkjet ink composition, of at least one pigment, a carrier fluid, and 0.1 to 25% by weight, based on the total weight of the inkjet ink composition, of at least one polymer comprising first monomers selected from ethylenically unsaturated, hydrophobic monomers, wherein the ethylenically unsaturated, hydrophobic monomers are selected from styrene, α-methylstyrene, ethylene, propylene, 1-butylene, isobutylene, butadiene, methyl vinyl ether, and ethylenically unsaturated esters. and second monomers selected from maleic anhydride, maleic acid and salts, esters, imides and amides thereof, wherein at least a portion of the second monomers is functionalized with at least one organic group having a calcium index value greater than the calcium index value of phenylphosphonic acid, and wherein the first monomers are provided in the at least one polymer in a proportion in the range of 40 to 90 mol% relative to the at least one polymer, and wherein the second monomers are provided in the at least one polymer in a proportion in the range of 10 to 60 mol% relative to the at least one polymer, and wherein the at least one polymer has an acid number of 90 to 325 according to the following equation: AN (xlink) = AN (SP) − (% CO 2 − Target) × AN (SP) where “AN(xlink)” represents the acid number of the at least one polymer being crosslinked, “AN(SP)” represents the acid number of the starting polymer, and “%CO2 target” represents the percentage of the carboxylate-containing target for crosslinking.

The present disclosure relates to a method of manufacturing a test strip for measuring the specific gravity of a urine sample, the method comprising successively: - providing a polyelectrolyte in a first solution, the polyelectrolyte being a poly(methyl vinyl ether-alt-maleic anhydride), - adding to the first solution a base to neutralize the polyelectrolyte and bring the first solution to a pH between 10 and 11, - adding to the first solution a buffering agent to bring and maintain the first solution at a pH between 7.0 and 7.5, - dipping a paper strip into the first solution, - dipping the paper strip into a second solution comprising a pH-sensitive colored indicator. Figure 9

An oral care composition is disclosed, comprising 0.01 to 10% by weight of a deposited polymer and a polyhydroxy fatty acid amide surfactant of formula (I); wherein R 1 It is a C1-C4 alkyl or hydroxyl-substituted C1-C4 alkyl; R 2 It is a straight-chain or branched, saturated or unsaturated hydrocarbon chain having 15 to 21 carbon atoms, and a beneficial agent selected from optical agents, antimicrobial agents and mixtures thereof; wherein the deposited polymers include xanthan gum, sodium alginate, pectin, modified starch, gelatin, carrageenan, gellan gum, fenugreek gum, konjac gum, tragacanth gum, arabic gum, γ-polyglutamic acid, sodium heparin, copolymers of methyl vinyl ether and maleic anhydride, polyacrylic acid, polystyrene sulfonate, deoxyribonucleic acid, poly(allylamine), locust bean gum, guar gum, polyglycolic acid, polylactic acid, poly(glycolic acid-co-lactic acid), chitosan, humic acid, phytic acid, derivatives thereof or mixtures thereof:

The invention relates to the technical field of polyvinylidene fluoride materials, in particular to a polyvinylidene fluoride offshore photovoltaic cable material. The polyvinylidene fluoride offshore photovoltaic cable material is prepared from the following raw materials in parts by mass: 40 to 70 parts of polyvinylidene fluoride, 20 to 50 parts of polyvinyl chloride, 5 to 15 parts of ethylene-trifluorochlor oethylene copolymer, 1 to 3 parts of perfluoroethyl vinyl ether, 0.1 to 1 part of dicumyl peroxide, 0.1 to 1 part of nano zinc oxide, 1 to 3 parts of calcium-zinc stabilizer, 10 to 30 parts of filler, 1 to 2 parts of lubricant and 0.5 to 1.5 parts of stearic acid. 1-2 parts of a plasticizer and 1-2 parts of a compatilizer. The requirement for long-term stable operation of an offshore photovoltaic cable in high-salt, high-humidity, high-temperature and strong-ultraviolet environments is effectively met, the requirement for long-term stable operation under severe offshore conditions is fully met, and meanwhile the preparation method is simple and suitable for large-scale application and popularization.

The invention discloses an IR783 soluble microneedle patch as well as a preparation method and application thereof, according to the method, chondroitin sulfate and a methyl vinyl ether-maleic anhydride copolymer are adopted as matrix materials, and a drug-loaded microneedle is prepared through a two-step pouring method. The length of the prepared microneedle body is about 500 microns, the diameter of the base is about 281 microns, and the microneedle has good mechanical strength and skin puncture performance and can be completely dissolved within 2 hours. The average drug loading capacity of IR783 is increased along with increase of the preparation concentration, and when the preparation concentration is 4 mg / mL, the average drug loading capacity reaches 28.51 + / -0.8013 microgram / tablet. An in-vitro release rate test shows that the release rate of IR783 within 15 minutes reaches 88.39%. A photo-thermal property investigation result shows that under the irradiation of 808nm laser, the photo-thermal temperature of IR783-DMNs can reach 56.77 DEG C to the maximum within 120 seconds, and exceeds a 42 DEG C threshold value required by photo-thermal therapy. The microneedle is non-irritant to the skin, the skin can be naturally healed within 15 minutes after puncture, and a new administration mode is provided for photothermal therapy of skin cancer.

A method for modifying a material through rapid surface grafting, and a use thereof are provided. In the method, with an olefin-functionalized nanomaterial as a model matrix, a cycloolefin as a polymerization monomer, a Grubbs catalyst as an initiator, and ethyl vinyl ether as a terminator, surface olefin cross-metathesis is conducted to prepare a polyolefin-grafted nanomaterial. In the use, with a thermoplastic resin as a matrix and the surface-polyolefin-grafted nanomaterial as a reinforcing material, a composite is prepared. The compatibility between the reinforcing material and the thermoplastic resin matrix is evaluated through cross-sectional morphology and mechanical performance characterization. A chain-transfer reaction is adopted as an alternative approach for surface-initiated ring-opening metathesis polymerization to avoid the growth of polymer chains from the surface. This alternative approach can significantly improve a reaction rate, shorten a reaction time, and simplify a technical flow, and demonstrates a promising industrialization prospect.

Co-cured blends of fluoroelastomers of tetrafluoroethylene-propylene copolymer with cure site monomer and a pentapolymer of vinylidene fluoride (VDF), hexafluoropropylene (HFP), tetrafluoroethylene (TFE), perfluorinated methyl vinyl ether (PMVE) and ethylene (PE) with peroxide as initiator and coagent TAIC as crosslinker show improved curing performance, improved mechanical properties and improved compression set as well. The co-cured fluoroelastomers show improved chemical resistance to the solvent aging systems and better retention of mechanical properties after aging at high temperature in the solvents system.

The application discloses a peanut shell-based heavy metal adsorbent and a preparation method and application thereof. The preparation method comprises the following steps: pretreating peanut shell to obtain alkaliized peanut shell powder; under the catalysis of an organic base, the alkaliized peanut shell powder and a methyl vinyl ether / maleic anhydride copolymer are subjected to grafting reaction in a solvent I to prepare a peanut shell-methyl vinyl ether / maleic anhydride copolymer grafting product; under the catalysis of the organic base, the grafting product and a hydroxyl-terminated hyperbranched polyester are subjected to reaction in a solvent II, so that the peanut shell-based heavy metal adsorbent is obtained. The peanut shell-based heavy metal adsorbent prepared by the application has strong adsorption capacity, and the saturated adsorption capacity can reach 1185.50 mg.g 2+ . ‑1 .

The invention relates to a one-way moisture-conducting watermarking-free functional eyelet fabric and a production method thereof. Comprising a polyester quick-drying surface layer, a polyester hydrophobic inner layer and a connecting layer for connecting the polyester quick-drying surface layer and the polyester hydrophobic inner layer, the polyester hydrophobic inner layer is obtained by hydrophobic treatment of a hydrophobic treatment agent; the hydrophobic treatment agent is prepared from waterborne polyurethane resin, a waterborne polyisocyanate cross-linking agent, hydroxyl alkyl silicone wax, double-alcohol hydroxyl single-end-capped long-chain alkyl silicone oil and a processing aid; the polyester quick-drying surface layer is obtained by performing hydrophilic treatment on a hydrophilic quick-drying treatment agent; the hydrophilic quick-drying treatment agent is prepared from a water-based hydroxyl polyurethane dispersion, hydroxyl-terminated hyperbranched polyester, N-(beta-aminoethyl)-gamma-aminopropyl triethoxy silane, liquid polycaprolactone polyol, poly (methyl vinyl ether-ALT-maleic anhydride), sulfonated nano cellulose, blocked water-based polyisocyanate and a processing aid. The eyelet fabric prepared by the scheme has the advantages of moisture conductivity, quick drying, no watermark, durability and the like.

The present application relates to a kind of fluorescent enhancement composition and fluorescent enhancement liquid for tyramide signal amplification system.The fluorescent enhancement composition of the present application includes enhancer and cluster agent;The molar ratio of the enhancer and cluster agent is (0.1-1) mol:(1-10) mmol;The enhancer is one or more than two combinations of 4,4-bis (5-methyl-2-benzoxazolyl) stilbene, 2,5-bis (5-tert-butyl-2-benzoxazolyl) thiofene, 4,4'-bis (2-sulfonic acid sodium phenylvinyl) biphenyl and 1,2-bis (5-methyl-benzoxazolyl) -ethylene;The cluster agent is one or more than two combinations of alginic acid, povidone, methyl vinyl ether-maleic anhydride copolymer and carrageenan.The fluorescent enhancement liquid with the above-mentioned fluorescent enhancement composition for tyramide signal amplification system as main component can enhance the effect of fluorescent signal amplification, reduce non-specific coloring.

The invention provides modified phenolic resin, a preparation method thereof and an i-line chemical amplification photoresist composition, and relates to the technical field of semiconductor manufacturing. The modified phenolic resin is formed by common protection of hydroxyl of phenolic resin by 1, 4-butanediol divinyl ether and ethyl vinyl ether. The modified phenolic resin is jointly modified by 1, 4-butanediol divinyl ether and ethyl vinyl ether, and a cross-linked network is constructed by utilizing bifunctional groups so as to remarkably improve the heat resistance and the etching resistance and solve the problems of pattern deformation and'edge cutting '; meanwhile, the reaction activity is regulated by utilizing a single functional group, and the crosslinking abrupt property is relieved to broaden an energy window. And through the synergistic effect of the two components, the material has excellent heat resistance and corrosion resistance, wide process window and high resolution, and meets the high-precision microelectronic manufacturing requirements.

A fuel additive composition comprising butanol, pentanol, hexanol, heptanol, methylcyclohexanol, ethyl vinyl ether and nonanol. The composition may comprise 1-butanol, 2-butanol, 2-pentanol, 3-hexanol

The invention relates to the technical field of chemical engineering, in particular to a preparation method of cyclohexyl ethyl vinyl ether, which comprises the following steps: S1, by taking phenethyl alcohol as a raw material and low-boiling-point alcohol (ethanol or isopropanol) as a solvent, carrying out hydrogenation reduction at 50-65 DEG C and 5-6 MPa under the catalysis of nickel / ruthenium carbon to obtain cyclohexyl ethanol, and recycling the catalyst and the solvent; and S2, mixing cyclohexyl ethanol with alkenyl ether (preferably butyl vinyl ether), alkali (pyridine or triethylamine), a palladium catalyst (preferably palladium chloride) and a ligand 1, 10-phenanthroline in a protective gas atmosphere, performing catalytic alcohol exchange at 100-110 DEG C, washing reaction liquid with water to adjust the pH value to 7, passing through a column, and distilling to obtain the product. The method is mild in condition, low in equipment requirement, free of solid waste and environmentally friendly; the catalyst is small in dosage and recyclable, the solvent can be reused, and the cost is low; the product has high purity and high yield, and is suitable for industrial mass production.

The invention provides a foaming agent, rigid polyurethane foam and refrigeration equipment, and the foaming agent is prepared from pentane, perfluoroethyl vinyl ether and dimethyl formal, the mass ratio of the pentane to the perfluoroethyl vinyl ether to the dimethyl formal is (8 to 16): (1 to 10): (1 to 5). According to the foaming agent provided by the invention, through the synergistic effect of the pentane, the perfluoroethyl vinyl ether and the dimethyl formal in a specific mass ratio, rigid polyurethane foam with fine and uniform foam holes can be prepared, the heat conductivity coefficient of the foam is effectively reduced, and the thermal insulation property of the foam is improved; according to the present invention, the compression strength of the foam is improved, the molding density of the foam is significantly reduced, the foaming raw material can be effectively saved, the storage stability of the foaming agent in the foaming raw material is improved, the compatibility with the existing common ABS liner is improved, and the comprehensive performance of the rigid polyurethane foam is improved.