50 results about "Phenyl isocyanate" patented technology

The invention discloses a preparation method of a thidiazuron preparation, and relates to the technical field of thidiazuron preparation. The preparation method of the thidiazuron preparation comprises the following steps: adding 5-amino-1, 2, 3-thiadiazole, ethylene glycol dimethyl ether and triethylamine into a four-neck flask, heating and uniformly stirring, dropwise adding phenyl isocyanate into the mixed solution obtained in the step 1, heating to carry out catalytic synthesis reaction, cooling to room temperature, and carrying out suction filtration to obtain yellow solid thidiazuron. And further treating to obtain the thidiazuron preparation. Sodium nitrite is selected as a solvent in the preparation process of 5-amino-1, 2, 3-thiadiazole, and the amount of substance of another initial material aminoacetonitrile hydrochloride is controlled in the preparation reaction, so that the yield of thidiazuron is ensured to be optimal, the reaction temperature range and the dropwise adding amount are determined, the optimal reaction conditions are finally perfected, and the yield of 5-amino-1, 2, 3-thiadiazole is improved. A preparation mode which is simpler to operate, higher in yield and suitable for industrial production is provided for preparation of the thidiazuron preparation.

The invention relates to the technical field of adhesives, and discloses an imidazolium ionic liquid and a preparation method and application thereof, the preparation method comprises the following steps: reacting omega-bromoalcohol with 1-(methoxymethyl) imidazole in acetonitrile, and washing with methyl tert-butyl ether to obtain a target ionic liquid precursor; and dissolving the product in acetonitrile, adding 4-trifluoromethyl phenyl isocyanate, and washing with methyl tert-butyl ether after the reaction is finished, thereby obtaining the target imidazolium ionic liquid. The imidazolium ionic liquid disclosed by the invention is applied to a PVB (Polyvinyl Butyral) adhesive, and the PVB adhesive shows excellent adhesion strength in a macroscopic adhesion performance test on the basis of multiple interactions, and particularly has excellent adhesion strength on aluminum. The obtained adhesive can be universally adapted to various substrates such as metal substrates and macromolecule substrates, and finally high-strength and high-durability intelligent adhesion performance is achieved.

This invention provides a boot-shaped press belt with suppressed strength imbalances between components and excellent strength, as well as a method for preparing the boot-shaped press belt. A boot-shaped press belt for a paper machine has at least one resin layer comprising a polyurethane resin containing an isocyanate prepolymer cured by a curing agent having active hydrogen groups. The urethane prepolymer is obtained by reacting a polyisocyanate compound containing 4,4'-methylenebis(phenyl isocyanate) with a polyol compound containing polytetramethylene ether diol. The curing agent comprises polycarbonate diol.

The present invention provides flexible and integral skin-containing polyurethane foams and two-component foam forming compositions for making them that comprise an aromatic polyisocyanate component, such as a methylene di(phenyl isocyanate), and a polyol component of an autocatalytic aliphatic polyether polyol and a melt modifying catalyst, such as potassium acetate, that exhibit excellent inherent flame retardant properties, passing exacting tests prescribed by the UN / ECE 118.02, Annexes 6, 7 and 8. The foam forming compositions may be all liquid and thus readily processible. Further, the two-component foam forming compositions and the polyurethane foams therefrom are halogen and melamine free and exhibit low emissions and low odor.

The invention relates to the technical field of coating protection, in particular to a multi-component composite epoxy coating with high toughness and aging resistance and a preparation method of the multi-component composite epoxy coating, and discloses the multi-component composite epoxy coating with high toughness and aging resistance. Comprising polyurethane coupled bisphenol A type epoxy molecules, fluorinated phenyl isocyanate graft modified epoxy molecules and a curing agent in a mass ratio of (10-20): (4-8): (2-6). The polyurethane modified epoxy resin is adopted, so that the flexibility of the composite coating can be improved. When the epoxy resin is grafted to the epoxy resin, the weather resistance of the coating can be remarkably improved, and the epoxy composite coating can still keep stability and functionality in a low-temperature, complex and changeable environment in the ocean.

The invention belongs to the technical field of medicine synthesis, and particularly relates to a preparation method of a rivaroxaban intermediate. 4-(3-oxomorpholinyl) phenyl isocyanate, namely a compound 1, and (2s)-3-chloro-2-hydroxy propyl carbamic acid tert-butyl ester, namely a compound 2 are subjected to a reaction, and an intermediate (S)-tert-butyl-(2-oxo-3-(4-(3-carbonyl morpholine) phenyl) oxazoline-5-methylene) carbamate, namely a compound 3, is obtained. The reaction conditions are mild and stable, the intermediate can be prepared with high yield and high purity, the problems of long reaction time, high-temperature reaction and the like are avoided, and the method is suitable for industrial production.

The invention relates to a sound-insulation water-based paint for building floor slabs and a preparation method thereof, and belongs to the technical field of water-based paints. The preparation raw materials of the sound insulation water-based paint comprise water-based epoxy resin, a water-based curing agent, a sound insulation filler A, a sound insulation filler B and an auxiliary agent, wherein the auxiliary agent is at least one of a coalescing agent, a defoaming agent, a flatting agent and an anti-aging agent; the ionic liquid, the dipropylene glycol diacrylate and the ethyl acrylate are crosslinked into a polymer layer through free radical polymerization reaction, and the surface of the hollow glass bead is coated with the polymer layer, so that the sound insulation filler A is prepared; the preparation method comprises the following steps: carrying out SN2 nucleophilic substitution reaction on N-vinyl imidazole and 2-bromoethanol, and carrying out reaction on a product and 4-ethyl phenyl isocyanate, so as to prepare the ionic liquid; and modifying the nano clay by using an epoxy silane coupling agent to prepare a sound insulation filler B. The sound insulation water-based paint solves the problem of uneven dispersion of the hollow glass beads, and the impact sound pressure level improvement amount can reach 17.9 dB through weighting of a synergistic effect.

This invention provides an ether-based electrolyte for improving the high-voltage and long-cycle stability of sodium-ion batteries, its preparation method, and its application. The ether-based electrolyte comprises a base electrolyte and additives; the additives include aromatic isocyanates and alkoxysilanes. The aromatic isocyanates are a combination of one of the following: 6-fluoro-1H-1,3-benzodioxane-8-yl isocyanate, 3,4-dihydro-1,5-benzodioxane-7-isocyanate, or 3,4-(methylenedioxy)phenyl isocyanate, and 4-trifluoromethoxyphenyl isocyanate; the alkoxysilanes are 2-cyanoethyltriethoxysilane or 3,3,3-trifluoropropyltriethoxysilane. The electrolyte of this invention achieves synergistic regulation of interfacial reactions and interfacial film evolution, is suitable for sodium-ion half-cells or full-cells, and can improve overall stability and operating efficiency under high-voltage and long-cycle operating conditions.

The invention provides an electrolyte and a lithium ion battery, and relates to the technical field of lithium ion batteries. The electrolyte comprises a lithium salt, an organic solvent and an additive, and the structural formula of the additive is shown as a formula I. And the additive is selected from one or more of 2-(trifluoromethoxy) phenyl isocyanate, 3-(trifluoromethoxy) phenyl isocyanate and 4-(trifluoromethoxy) phenyl isocyanate. The invention further discloses a preparation method of the polyurethane adhesive. The LUMO orbital energy of the electrolyte additive is low, a film can be preferentially formed at a negative electrode, the stability of an interfacial film is improved, meanwhile, the electrolyte additive is combined with constant acid and water in the electrolyte, the acid and the water are removed, and then the cycle stability of the battery is improved.

The invention relates to a phenyl isocyanate by-product treatment method and application thereof, the method comprises the following steps: S1, carrying out first separation treatment on a phenyl isocyanate by-product to obtain a diphenylmethane series diisocyanate and polyisocyanate mixture and a phenyl isocyanate mixture; s2, carrying out second separation treatment on the phenyl isocyanate mixture to obtain a phenyl isocyanate concentrated solution and a solvent; s3, the phenyl isocyanate concentrated solution and hydrochloric acid are subjected to a reaction in a reaction kettle, and aniline hydrochloride is obtained. According to the treatment method of the phenyl isocyanate by-product, the phenyl isocyanate-containing by-product generated in the MDI production process can be efficiently treated, the separated phenyl isocyanate can be converted into aniline hydrochloride through reaction, the aniline hydrochloride is reused in the MDI production process, the production efficiency is improved, and the production cost is reduced. Not only is the influence of phenyl isocyanate on the production process reduced, but also the production cost is saved.

The present invention provides a cross-linked liquid crystal poly (amino urea) ester elastomer material and its preparation method and application, relating to the field of functional materials technology. The preparation method of the cross-linked liquid crystal poly (amino urea) ester elastomer material provided by the present invention comprises the following steps: 4,4'-methylene bis (phenyl isocyanate), biphenyl liquid crystal monomer, polyhydroxy polyether, catalyst and polar solvent are mixed, and polymerization reaction is carried out to obtain a cross-linked polymer product system; the cross-linked polymer product system is cured and formed to obtain a cross-linked liquid crystal poly (amino urea) ester elastomer material. The cross-linked liquid crystal poly (amino urea) ester elastomer material prepared by the present invention has high mechanical strength, excellent tear resistance and fatigue resistance.

The application provides a self-repairing ceramic fiber composite material, a preparation method and application, and belongs to the technical field of ceramic fibers. The self-repairing ceramic fiber composite material is prepared by the carbamoylation reaction between isocyanate groups generated by the pyrolysis of phenylcarbamate and hydroxyl groups on the surface of ceramic fibers to generate polymers with urea groups of dynamic covalent bonds. Meanwhile, the urea groups also interact with imidazole-based ionic liquids through hydrogen bonds to form a dynamic hydrogen bond network. The network and the network structure of the phenyl isocyanate polymer are dynamically interpenetrated to form a double dynamic network, so that the composite material has a self-repairing function. The self-repairing ceramic fiber composite material has self-repairing performance, high tensile strength and ionic conductivity, and is suitable for preparing new energy batteries, capacitors or flexible sensors.

The invention relates to a preparation method of a modified graphene oxide polyurethane composite material, the modified graphene oxide polyurethane composite material prepared by using the method and application of the modified graphene oxide polyurethane composite material. The preparation method comprises the following steps: reacting graphene oxide with 4-(trifluoromethoxy) phenyl isocyanate to obtain modified graphene oxide; the preparation method comprises the following steps: mixing methylphenyl-2, 4-diisocyanate terminated poly (propylene glycol), adipic dihydrazide and a quadruple hydrogen bond monomer for reaction to obtain a polyurethane base material; adding the modified graphene oxide into a polyurethane base material, and uniformly mixing to obtain the modified graphene oxide polyurethane material. The functionalized graphene polymer composite anti-corrosion material with self-repairing and strong mechanical properties can be prepared by the method disclosed by the invention. The preparation method disclosed by the invention is simple to operate, and the prepared modified graphene oxide polyurethane composite material has relatively high self-repairing and anti-corrosion efficiency.

The present invention discloses a five-membered and six-membered ring metal platinum complex with high anti-tumor activity, a preparation method thereof and an application thereof. The structure of the five-membered and six-membered ring metal platinum complex is as follows: The present invention uses a pinene-functionalized cyclometalated main ligand and a phenyl isocyanate derivative as an auxiliary ligand to coordinate with platinum metal ions. After the reaction, a five-membered and six-membered metal heterocycle is formed, and 8 pairs of cyclometalated platinum complexes are obtained respectively. These compounds show high anti-tumor activity against K562 leukemia cells, BEL-7402 liver cancer cells, SGC-7901 gastric cancer cells, A549 lung cancer cells and Hela cervical cancer cells. The IC50 value is far lower than that of the traditional platinum drug cisplatin, greatly improving the anti-tumor activity and universality of the platinum complex, and will play an important role in the field of anti-tumor.

The invention provides a preparation method and application of a naphthalene bridged tetraurea macrocycle, and belongs to the technical field of adsorption material preparation. According to the invention, 4, 4 '-methylene bis (phenyl isocyanate) and 1, 5-diaminonaphthalene are used as raw materials to prepare the naphthalene bridged tetraurea macrocyclic material. The naphthalene bridged tetraurea macrocyclic material has a fluffy porous structure, can be used for adsorption separation of elemental iodine and iodide ion pollutants, shows excellent iodine adsorption capacity and rate, also shows extremely high adsorption kinetics rate and high interference resistance, and can be recycled for multiple times.

The invention provides anti-cracking floor paint with a hyperbranched structure and a preparation method of the anti-cracking floor paint, and belongs to the technical field of floor paint. According to the invention, polytetrahydrofuran ether glycol reacts with 4, 4 '-methylene bis (phenyl isocyanate) to generate a polyurethane prepolymer, so that the material is endowed with excellent elasticity, strength and chemical stability; the phosphorus-nitrogen co-modified hyperbranched polyol and a matrix form a high cross-linked network through a polyfunctional group and a hyperbranched structure, so that the crack resistance and the flame retardance are improved; sulfydryl-terminated functional polyether participates in crosslinking through high reaction activity of sulfydryl, network uniformity is optimized, and flexibility is enhanced; the modified calcium carbonate filler improves interface bonding, improves mechanical properties and inhibits crack propagation; the glass fiber provides high-strength enhancement, the polypropylene fiber is toughened and relieves stress concentration, and the glass fiber and the polypropylene fiber cooperate to realize a rigid-flexible complementary anti-cracking effect; all the components form a synergistic effect, so that the floor paint is excellent in mechanical property, crack resistance and durability.

The invention relates to an anti-winding leather collar suitable for a vortex spinning process and a treatment method thereof.The anti-winding leather collar comprises a leather collar body and a composite coating, the composite coating is formed by coating the surface of the leather collar body with a composite coating, the composite coating comprises a component A and a component B, the component A comprises dichloromethane and phenyl 3-isocyanate, and the component B comprises dichloromethane and phenyl 3-isocyanate; and the component B comprises trichloroethylene. The anti-winding leather collar has the effect of improving and preventing the stability of the anti-winding leather collar.

The present application relates to a kind of phenyl isocyanate byproduct processing method and its application, the method includes the following steps: S1: the phenyl isocyanate byproduct is carried out first separation processing, obtains the diisocyanate and polyisocyanate mixture of diphenylmethane series and phenyl isocyanate mixture;S2: the phenyl isocyanate mixture is carried out second separation processing, obtains phenyl isocyanate concentrated solution and solvent;And S3: the phenyl isocyanate concentrated solution is reacted with hydrochloric acid in reaction kettle, obtains aniline hydrochloride salt.The phenyl isocyanate byproduct processing method of one embodiment of the present application, the byproduct containing phenyl isocyanate generated in MDI production process can be efficiently treated, the separated phenyl isocyanate can be converted into aniline hydrochloride salt by reaction, and aniline hydrochloride salt is reused to MDI production process, both reduce the influence of phenyl isocyanate on the above production process and save production cost.

The invention discloses water-based wood-like polyurethane and a preparation method thereof.The stock solution of the water-based wood-like polyurethane comprises a phase A with polyoxytetramethylene glycol as a main component and a phase B composed of 4, 4 '-methylene bis (phenyl isocyanate) and bamboo nanocellulose suspension liquid, the two phases are stirred and foamed, and the water-based wood-like polyurethane is obtained. The waterborne polyurethane wood-like material can be obtained. The waterborne polyurethane wood-like material prepared by the preparation method disclosed by the invention has a certain water resistance and flame-retardant effect, and also has good mechanical properties.

The application discloses a kind of fluorine-containing thidiazuron derivatives and preparation method thereof, the structure of this kind of compound is as follows: wherein, R is the benzene ring any position containing 0-5 fluorine atom.Preparation method includes the following steps: with 5-amino-1,2,3-thiadiazole as raw material, with di-tert-butyl dicarbonate reaction to obtain amino-protected intermediate;With fluorination reagent to the reaction intermediate obtained in step one is fluorinated, obtain 4-fluorinated intermediate;Remove amino protection, obtain 5-amino-4-fluoro-1,2,3-thiadiazole;5-amino-4-fluoro-1,2,3-thiadiazole and different fluorinated phenyl isocyanate reaction, filtration to obtain different fluorine-containing thidiazuron derivatives.The application designs and synthesizes a kind of new chemical structure, these structures are similar to thidiazuron structure, all have good cotton defoliation effect;And synthesis route is simple, the reagent used is easy to obtain, has good application and development prospect.

The invention discloses a waterproof anticorrosive finish paint and a preparation method thereof, and relates to the technical field of coatings. The waterproof anticorrosive finish paint provided by the invention comprises a first component and a second component, wherein the first component is obtained by adding a solvent, a dispersing agent, a filler pigment, resin, a defoaming agent and a flatting agent step by step, fully mixing and sieving; the second component is prepared by mixing fluorine-containing phenyl isocyanate and an auxiliary curing agent under the protection of protective gas, then adding a solvent and a catalyst, uniformly mixing at a controlled temperature, and further sieving; and finally, mixing and stirring the two components in proportion, and standing and curing to obtain the waterproof and anticorrosive finish paint. The waterproof and anti-corrosion finish paint prepared by the invention is reasonable in component configuration, controllable in preparation process, stable in quality, excellent in waterproof and anti-corrosion performance and related mechanical properties, and capable of being widely applied to the surface of a base material needing efficient waterproof and anti-corrosion protection.

The present invention belongs to the technical field of concrete admixtures, and specifically relates to a highly adaptable polycondensation carboxylate water reducer, a preparation method and its application. The highly adaptable polycondensation carboxylate water reducer is formed by polycondensation of monomer A, monomer B and monomer C; the monomer A is a phenyl isocyanate compound with a carboxyl group, formed by the reaction of a phenyl isocyanate monomer and a carboxyl monomer with a hydroxyl or amine group; the monomer B is a phenyl isocyanate compound with a long-chain polyether, formed by the reaction of a phenyl isocyanate monomer and a methoxy polyoxyethylene ether monomer; the monomer C is an aldehyde monomer selected from formaldehyde, acetaldehyde, glyoxylic acid and benzaldehyde. The water reducer introduces a benzene ring structure into the main chain, so that it has better air entraining performance, and can improve the workability, workability and adaptability of concrete to cement compared with traditional polycarboxylate water reducers.

This invention relates to the technical field, specifically to a method for preparing high-purity n-hexane based on selective extraction of non-aromatic hydrocarbons. The method includes first suspending and polymerizing a first oil phase in a continuous aqueous phase to form cross-linked polymethacrylate core microspheres, then adding a second oil phase containing glycidyl methacrylate for further polymerization to obtain a cross-linked polymethacrylate microsphere matrix; swelling the microsphere matrix with n-heptane / ethyl acetate, then sequentially amination, followed by sequential reaction with n-butyl isocyanate and 2-(trifluoromethyl)phenyl isocyanate to obtain a selective extraction resin; activating and packing the resin into a column for the separation of non-aromatic C6 mixed hydrocarbons, collecting the fraction with a n-hexane mass fraction greater than 99.2 wt% to obtain high-purity n-hexane. This method has the advantages of high separation selectivity and good cycle stability.

The present application relates to a kind of preparation methods of modified graphene oxide polyurethane composite, modified graphene oxide polyurethane composite prepared using the method and its application.The preparation method of the present application includes: graphene oxide is reacted with 4-(trifluoromethoxy) phenyl isocyanate to obtain modified graphene oxide;Toluene group-2,4-diisocyanate end-capped poly (propylene glycol), adipic acid dihydrazide is mixed with four hydrogen bond monomers, to obtain polyurethane base material;Modified graphene oxide is added to polyurethane base material and mixed uniformly, to prepare modified graphene oxide polyurethane material.By the method of the present application, functionalized graphene polymer composite anticorrosive material with self-repairing, strong mechanical properties can be prepared.The preparation method of the present application is simple, and the modified graphene oxide polyurethane composite prepared has higher self-repairing anticorrosive efficiency.

The invention provides a self-repairing ceramic fiber composite material, a preparation method and application, and belongs to the technical field of ceramic fibers. According to the self-repairing ceramic fiber composite material, isocyanate groups generated after pyrolysis of phenyl carbamate and hydroxyl groups on the surfaces of ceramic fibers are subjected to carbamylation reaction to generate a polymer with dynamic covalent bond urea groups, and meanwhile, the urea groups and imidazolyl ionic liquid form a dynamic hydrogen bond network through hydrogen bond interaction; the network is dynamically interspersed with the network structure of the phenyl isocyanate polymer to form a dual dynamic network, so that the composite material has a self-repairing function. The self-repairing ceramic fiber composite material disclosed by the invention has self-repairing performance, relatively high tensile strength and ionic conductivity, and is suitable for preparing a new energy battery, a capacitor or a flexible sensor.

The invention belongs to the technical field of chemical analysis. Relates to a method for detecting BP007-SM3 related substances, in particular to a method for detecting BP007-SM3 related substances {4-chloro-3-(trifluoromethyl) aniline, 1, 3-bis [4-chloro-3-(trifluoromethyl) phenyl] urea, 2-chloro-5-nitro-trifluoromethyl benzene, methyl [(3-trifluoromethyl) phenyl] carbamate, methyl [2-chloro-3-(trifluoromethyl) phenyl] carbamate and 2-chloro-3-(trifluoromethyl) aniline}. Particularly relates to a chromatographic column taking phenylsilane bonded silica gel as a filling agent, which adopts a diode array detector or an ultraviolet detector, takes a mixed solution of a phosphate buffer solution, acetonitrile and methanol as an eluent, and performs elution according to a gradient mode. And a detection method which is simple and convenient to operate, high in specificity, high in accuracy and high in sensitivity is provided for detecting related substances of BP007-SM3.

The invention relates to the technical field of liquid crystal materials, and discloses 3, 3 '-biphenol-thiadiazolyl diurea as well as a preparation method and application thereof. Aminoacetonitrile hydrochloride and sodium nitrite react to generate aminoacetonitrile diazonium salt; reacting the aminoacetonitrile diazonium salt with hydrogen sulfide to generate 5-aminothiadiazole; the preparation method comprises the following steps: reacting 5-aminothiadiazole with 3-chloro-6-methoxy phenyl isocyanate to generate thiadiazolyl-3-chloroanisole-2-ylurea, and recording the thiadiazolyl-3-chloroanisole-2-ylurea as BP010-3; and reacting the BP010 <-3 > with sodium hydroxide to generate BP010 <-4 >, and reacting the BP010 <-4 > with hydrochloric acid to generate the 3, 3 '-biphenol-thiadiazolyl diurea. According to the liquid crystal material 3, 3 '-biphenol-thiadiazolyl diurea, different functional groups are introduced into biphenol to achieve different application scenes, compared with a traditional material, the material has better electrical conductivity, abrasion resistance, moisture resistance, cold resistance and the like, and the technical barrier of liquid crystal material application in the market is broken through.

The tail gas treatment device comprises a tower body, the side wall of the tower body is provided with an amine liquid feeding port and an MDI tail gas inlet, the top of the tower body is provided with a tail gas outlet, a fixed feeding pipe, a spraying assembly and a driving part are arranged in the tower body, one end of the fixed feeding pipe is connected to the amine liquid feeding port, and the other end of the fixed feeding pipe is connected to the MDI tail gas inlet. The spraying assembly is rotatably connected to the other end of the fixed feeding pipe, the driving part is used for driving the spraying assembly to rotate, and the MDI tail gas inlet is located below the spraying assembly. The MDI tail gas treated by the tail gas treatment device enters a vacuum system, so that MDI and phenyl isocyanate substances can be prevented from entering the vacuum system, the vacuum system can be prevented from being blocked, and a normal production process is ensured.

The application discloses a xylene tolerance adjustable adduct type curing agent and a preparation method thereof. The adduct type curing agent comprises a combination of TDI monomers and halogenated methyl phenyl isocyanate in raw materials; in the combination of TDI monomers and halogenated methyl phenyl isocyanate, the proportion of halogenated methyl phenyl isocyanate is 0.2-60wt%. The application can obtain adduct products with different molecular weight distribution by adjusting the content of halogenated methyl phenyl isocyanate in TDI under the same formula system, and when the hydroxyl resin component of the paint is changed, the actual use condition can be flexibly adjusted, and the purpose of changing the compatibility of the adduct product and the hydroxyl resin by single adjustment of the composition of the TDI component raw material is achieved.

The invention discloses a warm-keeping antibacterial fiber as well as a preparation method and application thereof, and relates to the technical field of textile fibers. When the warm-keeping antibacterial fiber is prepared, 4, 4 '-methylene bis (phenyl isocyanate) and polyethylene glycol are subjected to a reaction, and a polyurethane prepolymer is prepared; the polyurethane prepolymer and 2-vinyl-4, 6-diamino-1, 3, 5-triazine are subjected to a reaction, and modified polyurethane is prepared; the preparation method comprises the following steps: reacting chitosan with mercaptoacetaldehyde to prepare modified chitosan; the preparation method comprises the following steps: reacting graphene oxide with diisopropyl (2-amino-1-propenyl) phosphonate to prepare modified graphene oxide; the modified polyurethane, the modified chitosan and the modified graphene oxide are mixed and then subjected to melt spinning, and modified polyurethane fibers are prepared; and immersing the modified polyurethane fiber into a sodium hypochlorite aqueous solution to prepare the warm-keeping antibacterial fiber. The warm-keeping antibacterial fiber prepared by the invention has good warm-keeping, far-infrared, antibacterial, flame-retardant and mechanical properties.