55 results about "Furfurylamine" patented technology

The invention relates to a benzoxazine resin based on furfuryl amine, a composition and a preparation method thereof. The benzoxazine resin is prepared from phenol derived from renewable resources (for example, eugenol, guaiacol and cardanol), primary amine derived from renewable resources (for example, furfuryl amine) and an aqueous solution of paraformaldehyde or trioxymethylene or formaldehyde; and the relevant composition is a composition prepared from the benzoxazine resin and other thermosetting resins. The benzoxazine resin based on furfuryl amine and the composition thereof can be used in multiple fields of matrix resins of paint, thermosetting plastic, composite material and the like.

The invention relates to a furfurylamine type benzoxazine resin / maleimide compound composition, which is prepared from furfurylamine type benzoxazine resin and a series of maleimide group-containing compounds. The composition can be cured at lower temperature and used in a plurality of fields of coatings, thermosetting plastics, substrate resin of composite materials, and the like.

The invention belongs to the technical field of biomedical materials and discloses double-crosslinked sodium alginate hydrogel and a preparation method and application thereof. The preparation method includes: dissolving sodium alginate into deionized water, adding activating agents to activate, adding furfurylamine to react for 12-36 hours, and subjecting a reaction product to dialysis and freeze drying so as to obtain furan-modified sodium alginate; dissolving the furan-modified sodium alginate into the deionized water, adding maleimide-terminated polyvinyl alcohol, stirring sufficiently to dissolve, performing ultrasonic treatment, injecting into a mould, and crosslinking at 37-60 DEG C so as to obtain gel; soaking the gel into a calcium chloride solution for 12-48 hours for physical crosslinking so as to obtain the double-crosslinked sodium alginate hydrogel. By the aid of a double-crosslinking method consisting of click chemistry crosslinking and ionic crosslinking, the obtained double-crosslinked sodium alginate hydrogel has excellent mechanical and anti-swelling properties and can be applied to scaffolds for tissue engineering.

The invention discloses an environment-friendly flame retardant. The flame retardant is prepared by firstly utilizing tetrabutyl ammonium hydroxide and phosphoric acid to peel zirconium phosphate andthen utilizing furfuryl amine to coat zirconium phosphate. The flame retardant can effectively solve the problems that zirconium phosphate is easy to agglomerate and the like, and can play a synergistic flame-retardant role with an intumescent flame-retardant system in a fireproof coating. When the flame retardant is used to prepare an intumescent fire retardant coating, the film-forming property,the fire resistance, the durability and the like of the obtained fire retardant coating can be remarkably improved. The obtained flame retardant integrates flame retardance, smoke suppression and enhancement functions and is low in halogen-free cost, good in char forming property, high in carbon layer strength, environmentally friendly and wide in applicability, and the related preparation methodis simple in process, mild in reaction conditions and suitable for application and popularization.

The invention provides a preparation method of a bio-based self-repairing polyurethane elastomer. The method comprises the following steps: taking furfuryl amine and vanillin as main raw materials to obtain a micromolecular chain extender, carrying out chain extension reaction on the micromolecular chain extender and a polyurethane prepolymer prepared from diphenylmethane diisocyanate and polypropylene glycol, carrying out vacuum defoaming, pouring into a polytetrafluoroethylene mold, and curing to finally obtain the bio-based polyurethane elastomer with the self-repairing function. According to the invention, the chain extender with the imine dynamic covalent bond are environmentally friendly in raw materials, and wide in raw material source, and is introduced into a polyurethane structure through molecular design to endow an elastomer with excellent self-repairing performance and mechanical performance, wherein the self-repairing efficiency at 60 DEG C can reach 87%, and the elongation at break is 220%.

The invention discloses a preparation method of self-repairing non-isocyanate polyurethane, and belongs to the technical field of polyurethane. Firstly, a furan ring-terminated non-isocyanate polyurethane pre-polymer is prepared by reacting diglycerin bicyclic carbonate with furfurylamine, a polyether triamine or an aliphatic triamine, and then the pre-polymer is mixed with bismaleimide for carrying out a DA reaction under catalyst-free and solvent-free conditions to prepare the self-repairing non-isocyanate polyurethane. According to the method, the raw material is easy to obtain, the reaction condition is mild, the operation is simple and convenient, the process is green and environment-friendly, and the prepared self-repairing non-isocyanate polyurethane has excellent mechanical properties and self-repairing efficiency.

The invention relates to self-repairing linear polyurethane and a preparation method thereof, and belongs to the technical field of high polymer materials. The preparation method comprises the following steps: taking polypropylene glycol and TDI, adding DMF, heating to 40-60 DEG C, and dissolving to obtain a dissolved solution; adding PPG into an obtained dissolving solution, heating the temperature to 65-85 DEG C, carrying out a stirring reaction for 12-18 min under the protection of nitrogen, and thus obtaining an intermediate; taking out the intermediate, cooling to 0 DEG C, adding furfurylamine, carrying out a reaction for 25-40 min, and recovering to room temperature to obtain a polyurethane prepolymer; and adding bismaleimide into the obtained polyurethane prepolymer, carrying out areaction for 24 h at a temperature of 75-85 DEG C, and taking out the obtained reaction product to obtain the self-repairing linear polyurethane. The invention also provides the self-repairing linearpolyurethane. According to the preparation method of the self-repairing linear polyurethane, the self-repairing linear polyurethane can be efficiently prepared, and the prepared self-repairing linearpolyurethane is good in self-repairing effect.

The invention discloses shape memory resin based on biomass benzoxazine as well as a preparation method and application of the shape memory resin. The preparation method comprises the following steps:taking biomass furfuryl amine, vanillic aldehyde and paraformaldehyde as raw materials, and carrying out a heating reaction to obtain an aldehyde group-containing biomass benzoxazine monomer; mixingan aldehyde group-containing biomass benzoxazine monomer with polyether amine, and carrying out a coupling reaction to obtain a Schiff base biomass benzoxazine monomer; and curing the Schiff base biomass benzoxazine monomer to obtain the biomass benzoxazine resin with the shape memory function. Compared with the prior art, the benzoxazine shape memory resin disclosed by the invention has excellentthermal performance, high tensile modulus and high strength. According to the benzoxazine resin obtained by the method disclosed by the invention, the original shape can be permanently changed according to needs, the defect that a traditional cross-linked polymer cannot be reprocessed after being formed is overcome, the recovery function under the condition of heating stimulation is achieved, andthe application range of the shape memory polymer is greatly widened due to the excellent thermal performance and mechanical performance.

The invention discloses a benzoxazine full-bio-based resin and a preparation method thereof. The preparation method comprises the following steps: mixing bisphenol with a chalcone structure, furfurylamine and an aldehyde compound in an organic solvent, reacting at 85-125 DEG C for 8-48 hours, and purifying the reaction product to obtain a full-bio-based benzoxazine monomer; and curing the full-bio-based benzoxazine monomer at a temperature of 80-240 DEG C for 1-24 hours, or carrying out ultraviolet irradiation on full-bio-based benzoxazine monomer for 0.5-2 hours, and then curing the benzoxazine monomer at a temperature of 80-120 DEG C for 4-24 hours to obtain the benzoxazine full-bio-based resin. The obtained full-bio-based benzoxazine resin has a high glass-transition temperature (296-381 DEG C), a high carbon residue rate (58-67%), a high limit oxygen index (36.5-43.7) and a low dielectric constant (2.10-2.95), and has excellent heat resistance, flame retardant property and dielectric property.

The invention discloses a monomer of bio-based benzoxazine resin, the benzoxazine resin and a preparation method thereof. The structural formula of the resin is shown as the following formula (II). According to the biomass benzoxazine resin disclosed by the invention, phlorenic acid and furfuryl amine are respectively used as a phenol source and an amine source. PHA molecules have phenolic hydroxyl structures similar to those of phenol, so that PHA serving as a polymer monomer from a bio-based source can completely replace phenol or bisphenol A to be used for preparing high polymer materials such as benzoxazine resin and the like; F is also a common biomass fine chemical raw material produced from plant raw materials such as corncobs, cottonseed hulls, bagasse and the like in nature; by taking phlorenic acid as a phenol source and furfuryl amine as an amine source, excessive dependence of traditional benzoxazine resin on petroleum products is eliminated.

The invention discloses an environment-friendly PLA flame-retardant plastic which is prepared by taking a composite environment-friendly flame retardant and polylactic acid as raw materials and sequentially performing mixing and extrusion molding, wherein the composite environment-friendly flame retardant is generated by a reaction between phytic acid and furfuryl amine under a stirring condition.The composite environment-friendly flame retardant is applied to preparation of the PLA plastic product, and free radicals required by a combustion reaction can be effectively captured during pyrolysis or combustion, so that the combustion reaction is inhibited; meanwhile, all the raw materials are pollution-free to the environment, the application field of the PLA material can be further widened, and the fire resistance and the stability of the PLA material can be effectively improved; and the related preparation method is simple, wide in raw material source and suitable for popularization and application.

The invention relates to an antiviral healthy plant water-based paint, which is prepared from the following components in parts by weight: 60-80 parts of modified acrylic emulsion, 10-30 parts of water, 5-10 parts of antiviral plant microspheres, 10-20 parts of pigment filler and 1-3 parts of auxiliaries, wherein the modified acrylic emulsion is obtained by modifying an acrylic emulsion with 5-methyl furfuryl amine; and the antiviral plant microspheres are microspheres prepared by taking an extract of an antiviral plant wormwood as an effective component. The anti-virus healthy plant water paint is prepared by using the modified acrylic emulsion as a matrix, the anti-virus plant microspheres as anti-virus effective components and the pigments and fillers as additives, and the water paint is non-toxic, environment-friendly, good in water resistance and high in stability, contains anti-virus components of natural plants, has a relatively high anti-virus effect, and the anti-virus coating can achieve a lasting anti-virus effect, and is very suitable for places such as hotels, hospitals and the like which are high in virus content and need to resist viruses.

The invention provides a preparation method of furosemide and relates to the technical field of pharmaceutical synthesis. The preparation method comprises the following steps: (1) 2,4-dichloro-5-sulfamoylbenzoic acid and alkali are subjected to a reaction in presence of an organic solvent, a reaction liquid is obtained and subjected to aftertreatment, and sodium 2,4-dichloro-5-sulfamoylbenzoic acid is obtained; (2) sodium 2,4-dichloro-5-sulfamoylbenzoic acid and furfurylamine are subjected to a reaction in presence of an organic solvent, furfurylamine and the solvent are recovered through reduced pressure distillation after the reaction, a reaction liquid is obtained and mixed with isopropyl alcohol, a mixture is stirred, crystallized and filtered, and sodium furosemide is obtained; (3) sodium furosemide is subjected to water dissolution, activated carbon decoloration and glacial acetic acid acidification, and a finished furosemide product is obtained. The preparation method has the advantages that raw materials are cheap and available, the cost is low, short time is consumed, reaction steps are short, operation is simple, product quality is good, yield is high, solvents can be recycled and reused, environmental pollution is small and the like, and the preparation method is suitable for industrial production.

The invention discloses a preparation method of a self-repairing transparent polyurethane composite material with electrical conductivity and thermal reversibility. The preparation method comprises the following steps: step 1, synthesizing a prepolymer (MPF) from furfurylamine (FAm) and 4, 4 '-diphenylmethane diisocyanate (MDI) through a one-step method, carrying out a reaction by using a dienophile, carrying out a DA reaction through an electron withdrawing effect, and carrying out tape casting in a template to obtain a self-repairing transparent polyurethane film (PU-DA) with thermal reversibility; and step 2, loading the nano silver wire onto a self-repairing transparent polyurethane film (PU-DA) with thermal reversibility through a charge adsorption effect so as to prepare the self-repairing transparent polyurethane film (PU-DA / Ag) with conductivity and thermal reversibility. The prepared composite material has the advantages of better light transmission, conductivity and the like,and has wide application in the field of flexible electronic devices.

The invention discloses an analysis method for determining the content of furfurylamine in furosemide, which comprises the following steps: dissolving furosemide with sodium hydroxide, neutralizing furosemide with hydrochloric acid, determining furosemide by high performance liquid chromatography, and taking a mixed solution of phosphate buffer salt and acetonitrile as a mobile phase by using a C18 chromatographic column. The invention provides a method for quickly determining furfurylamine in furosemide, which is strong in specificity, high in sensitivity, high in accuracy, simple and convenient to operate and capable of more effectively controlling the quality of furosemide.

The invention relates to curcumenol derivatives and application of the curcumenol derivatives in preparing an antitumor drug. By performing structure modification on the curcumenol derivatives, aftera furfuryl amine fragment is introduced at a hydroxy group site of curcumenol, amine is further introduced through Mannich reaction to obtain a series of the curcumenol derivatives of a structure of aformula (I) as well as pharmaceutically acceptable salts, hydrates, solvates or prodrugs of the curcumenol derivatives which are not reported. Verified by an in vitro bioactivity experiment, the newcurcumenol derivatives have the inhibitory activity to a cervical cancer, a liver cancer, a lung cancer and the like, and the compound activity of most of the new curcumenol derivatives are remarkablyhigher than that of curcumenol as a parent of the new curcumenol derivatives. In addition, the polarity of the vast majority of the synthesized curcumenol derivatives is remarkably improved comparedwith the curcumenol; according to the similarity and intermiscibility principle, the phenomenon that the solubility of the synthesized curcumenol derivatives is higher than that of the curcumenol of aparent compound is proved to a certain degree, and a basic theoretical basis is provided for better performing preparation research and exerting efficacy. The formula (I) is shown in the description.

The invention provides polyimide resin and a polyimide film with a self-repairing function, preparation methods thereof and a flexible foldable display screen cover plate base film, and relates to the technical field of materials. The polyimide resin is mainly prepared from a diamine monomer, a dianhydride monomer, an end-capping reagent, a dehydrating agent, a catalyst and other raw materials, furfuryl amine and maleic anhydride are used as the end-capping reagent, conjugated diene and substituted olefin structures can be introduced into a polyimide resin main body structure, and on the basis of a dynamic reversible Diels-Alder reaction, a cyclohexene structure is cracked at a relatively high temperature to generate the furfuryl amine and maleic anhydride, and furfuryl amine and maleic anhydride spontaneously react in a cooling process to produce the cyclohexene structure, so that self-repairing of the polyimide resin is realized. The invention also provides the polyimide film with the self-repairing function, the polyimide film is prepared from the polyimide resin, the polyimide film has the self-repairing function, and the repairing effect is not reduced along with the increase of the repeating times.

The invention discloses a full-bio-based benzoxazine resin and a preparation method thereof. The preparation method comprises the following steps: mixing bisphenol with a chalcone structure, furfurylamine and an aldehyde compound in an organic solvent, reacting for 8-48 hours at a temperature of 75-115 DEG C, purifying the reaction product to obtain a full-bio-based benzoxazine monomer; and curing the benzoxazine monomer at a temperature of 80-260 DEG C for 1-24 hours to obtain the full-bio-based benzoxazine resin; or irradiating the benzoxazine monomer by ultraviolet light for 0.5-4 hours, and curing the benzoxazine monomer for 4-24 hours at a temperature of 80-140 DEG C to obtain the full-bio-based benzoxazine resin. The curing temperature of the benzoxazine monomer containing a chalcone structure is further reduced; the thermal performance and crosslinking degree of the obtained benzoxazine resin are improved, and the obtained resin has a high glass transition temperature (204-376DEG C), a high carbon residue rate (50-70%), a high limit oxygen index (30.3-42.2) and a low dielectric constant (2.0-2.9).

The invention discloses high-density microporous polyurethane foam and a preparation method thereof. The preparation method comprises the following steps: step 1, preparing methylene difurfuryl amine: preparing methylene difurfuryl amine from furfuryl amine under the action of a hydrochloric acid solution and an aqueous solution of formaldehyde; step 2, preparing succinic cyclic carbonate: preparing succinic cyclic carbonate from succinic acid and glycerol carbonate under the action of a first catalyst; step 3, preparing a non-isocyanate polyurethane prepolymer: carrying out reaction on succinic acid cyclic carbonate and methylene difurfuryl amine; and step 4, preparing high-density microporous polyurethane: carrying out a reaction on diisocyanate, the non-isocyanate polyurethane prepolymer and the polyester polyol. The microporous polyurethane foam prepared by the method not only has excellent compressibility, slow rebound resilience, moisture resistance and chemical resistance, but also has excellent rebound resilience, can bear larger force and long-time compression, has better buffering, sealing, filling and shockproof effects, and is suitable for preparation of most frame sealing, module protection, hardware support and the like.

The invention relates to a tert-phenol-furfuryl amine type benzoxazine monomer, cured resin, and a preparation method of copolymerized resin thereof. The preparation method includes: in a one-time feeding or stepwise feeding manner, an aldehyde compound, furfuryl amine and p-tert-butylphenol are added into a reaction container, and an organic solvent is added for dissolution; then the mixture is heated to 80-120 DEG C and subjected to stirring reaction for 6-48 h, and the reaction product is subjected to after treatment to obtain the tert-phenol-furfuryl amine type benzoxazine monomer; the benzoxazine monomer then is dissolved in the solvent, and the mixture is heated to be heat-cured, thus preparing the tert-phenol-furfuryl amine type benzoxazine resin; or the benzoxazine monomer is subjected to dissolution and blending and subjected to thermo-curing with a benzoxazine prepolymer to obtain benzoxazine copolymerized resin. The method is low in cost and simple in process, wherein the tert-phenol-furfuryl amine type benzoxazine resin and the copolymerized resin thereof have great thermal property and excellent dielectric performance, i.e., low dielectric constant and dielectric lossunder ultrahigh frequency. The product can be applied to the fields such as high-frequency and high-speed circuit board substrate, micron wave and millimeter wave communication, vehicle-borne radars,and other composite materials.

The invention discloses a temperature-responsive self-lubricating hydrogel profile control agent and a preparation method thereof. By a one-pot process, in a water environment, a hydrophilic polymer matrix undergoes an amide-hydroxyl dehydration condensation chemical cross-linking reaction under the action of a cross-linking agent A to generate a high-strength temperature-resistant polymer network, meanwhile, the furfuryl amine-bisphenol A diglycidyl ether oligomer undergoes a Diels-Alder chemical cross-linking reaction under the action of a cross-linking agent B to generate a dynamic covalentnetwork, and the two networks are compounded to generate the temperature-responsive self-lubricating hydrogel profile control agent. The profile control agent has good temperature resistance and self-lubricating performance at the same time, and therefore the problems that the gel profile control agent is poor in deep profile control effect and low in water flooding sweep efficiency due to high friction resistance in a high-temperature oil reservoir are solved.

The invention relates to the field of self-repairing photo-curing materials, and discloses self-repairing polyurethane based on a two-way repairing structure, a preparation method and application thereof. The polyurethane contains structural units provided by R1, R2, R3, R4, R5, R6 and R7; wherein R1 is polyethylene glycol, R2 is isophorone diisocyanate, R3 is terephthalaldehyde, R4 is oxalyl dihydrazide, R5 is resorcinol diglycidyl ether, R6 is furfuryl amine, and R7 is N, N'-(4, 4'-methylene diphenyl)bismaleimide. The polyurethane provided by the invention has excellent self-repairing capability and high self-repairing efficiency, the service life of the material can be prolonged, and the hidden danger of microcracks caused by mechanical damage is reduced.

The invention relates to a physical and chemical dual-network hydrogel for a subcutaneous filler and a preparation method and application thereof, and the preparation method comprises the following steps: firstly, carrying out furfuryl amination modification on hyaluronic acid, and then carrying out freezing and unfreezing treatment on a modified hyaluronic acid solution added with a cross-linking agent; finally, obtaining chemically-crosslinked and physically-crosslinked hyaluronic acid double-network hydrogel, and then placing thechemically-crosslinked and physically-crosslinked hyaluronic acid double-network hydrogel in a dialysis bag to be dialyzed until the pH of the hyaluronic acid double-network hydrogel is neutral, wherein the obtained gel is finally used as the subcutaneous filling agent. Compared with the prior art, the hyaluronic acid dual-network hydrogel prepared by using a freeze-thaw physical crosslinking method and a click chemical covalent crosslinking method has good biocompatibility, mechanical properties, hyaluronidase degradation resistance and long-acting subcutaneous filling and forming effects, and can be used as a subcutaneous filling agent in the field of medical beauty.

The invention discloses benzoxazine intrinsic flame-retardant resin and a preparation method thereof, and the preparation method comprises the following steps: mixing deoxybenzoin bisphenol, furfurylamine and aldehyde compounds in an organic solvent, carrying out a reaction at 65-115 DEG C for 8-130 hours, and purifying a reaction product to obtain a benzoxazine monomer; and carrying out curing reaction on the obtained benzoxazine monomer at 80-280 DEG C for 1-48 hours to obtain the benzoxazine resin. Compared with the prior art, the intrinsic flame-retardant benzoxazine resin prepared by thepreparation method disclosed by the invention has a remarkably different chemical structure. The halogen-free flame-retardant thermoplastic elastomer has the advantages of higher flame retardancy, higher crosslinking density, higher glass-transition temperature (310-380 DEG C), higher carbon residue rate (45-62%), lower limit oxygen index (33.5-42.5) and lower heat release capacity, and the flameretardancy can reach Grade V-0 under standard tests.

The invention discloses a furyl phosphate flame retardant and a preparation method thereof. The structure of the flame retardant is shown in the following formula. The preparation method comprises the following steps: dissolving 5-hydroxymethylfurfural and an acid-binding agent in an organic solvent, then dropwise adding a phosphorus-containing compound, reacting at 0-80 DEG C for 0.5-12 hours, filtering a reactant, washing filtrate with water, and removing the solvent in an organic phase to obtain a phosphorus-containing furyl intermediate; and adding the phosphorus-containing furyl intermediate, furfuryl amine and a phosphorus-containing compound into a reactor according to a stoichiometric ratio, reacting at 50-100 DEG C for 3-24 hours, filtering a crude product after the reaction, washing with ethanol, and carrying out reduced pressure distillation to remove the organic solvent, thereby obtaining the furyl phosphate flame retardant. The flame retardant has a good flame retardant effect, and excellent flame retardant performance can be achieved by adding a small amount of the flame retardant into epoxy resin; the preparation method is simple and easy to implement, and the raw materials come from renewable resources and are green and environment-friendly.

The invention relates to a method for synthesizing 5-amino-1-pentanol by taking furfural as an initial raw material. The method comprises a three-step method and a two-step method. According to the three-step method, 5-AP is synthesized through a three-step cascade reaction of a reaction of furfural and ionic liquid type hydroxylamine salt for synthesis of furfuryl nitrile, a reaction of preparation of furfuryl amine through hydrogenation of furfuryl nitrile and a reaction of hydrogenolysis of furfuryl amine into 5-AP, furfuryl amine is obtained through high selectivity of a catalyst, and in the third step, tetrahydrofurfuryl amine and piperidine with high added values are produced while 5-AP is generated. In the two-step method, the reaction for preparing furfuryl amine through hydrogenation of furfuryl nitrile and the reaction for preparing 5-AP through hydrogenolysis of furfuryl amine are coupled into one-step reaction, so that the reaction steps are reduced. The method has the advantages of mild conditions, high selectivity and high atom utilization rate.

The invention relates to self-repairing cross-linked polyurethane and a preparation method thereof, and belongs to the technical field of high polymer materials. The preparation method comprises the following steps: mixing epoxy chloropropane and furfuryl alcohol, and adding a catalyst tetrabutylammonium bromide; dropwise adding a sodium hydroxide solution, then putting the mixture into an ice-water bath for 1.5-2.5 hours, and carrying out reduced pressure distillation after extraction, water washing and water removal treatment to obtain a crude product; taking furfuryl amine, adding methylbenzene to dissolve furfuryl amine, adding a catalyst tetrabutylammonium bromide, dropwise adding the crude product, and reacting at 55-70 DEG C for 3 hours to obtain a monomer; adding DMF, then adding isocyanate, heating to 65-85 DEG C, and stirring to react for 12-18 minutes; and adding 4, 4 '-diphenylmethane bismaleimide, reacting for 24 h at the temperature of 60-75 DEG C, and taking out to obtain the self-repairing cross-linked polyurethane. The preparation method can efficiently prepare the self-repairing cross-linked polyurethane, and the prepared self-repairing cross-linked polyurethane is good in self-repairing effect.

The invention belongs to the technical field of biomedical materials and discloses double-crosslinked sodium alginate hydrogel and a preparation method and application thereof. The preparation method includes: dissolving sodium alginate into deionized water, adding activating agents to activate, adding furfurylamine to react for 12-36 hours, and subjecting a reaction product to dialysis and freeze drying so as to obtain furan-modified sodium alginate; dissolving the furan-modified sodium alginate into the deionized water, adding maleimide-terminated polyvinyl alcohol, stirring sufficiently to dissolve, performing ultrasonic treatment, injecting into a mould, and crosslinking at 37-60 DEG C so as to obtain gel; soaking the gel into a calcium chloride solution for 12-48 hours for physical crosslinking so as to obtain the double-crosslinked sodium alginate hydrogel. By the aid of a double-crosslinking method consisting of click chemistry crosslinking and ionic crosslinking, the obtained double-crosslinked sodium alginate hydrogel has excellent mechanical and anti-swelling properties and can be applied to scaffolds for tissue engineering.

The invention discloses shape memory resin based on biomass benzoxazine as well as a preparation method and application of the shape memory resin. Biomass furfuryl amine and paraformaldehyde are usedas raw materials, and an aldehyde group-containing biomass benzoxazine monomer is obtained through a heating reaction under proper conditions; the aldehyde group-containing biomass benzoxazine monomeris mixed with polyether amine, and a coupling reaction is performed to obtain a Schiff base biomass benzoxazine monomer; and the Schiff base biomass benzoxazine monomer is cured to obtain the biomassbenzoxazine resin with the shape memory function. The preparation process is simple, no solvent is needed in the synthesis process, the yield is high, the raw materials are environmentally friendly,and dependence of high polymer materials on fossil resources is greatly reduced. Compared with the prior art, the benzoxazine shape memory resin provided by the invention has excellent thermal properties (the glass transition temperature Tg is 280 DEG C), high tensile modulus (2.46 GPa) and strength (90.4 MPa). The original shape of the benzoxazine resin is obtained by the method disclosed by theinvention can be permanently changed according to needs, the defect that a traditional cross-linked polymer cannot be reprocessed after being formed is overcome, the recovery function under the condition of heating stimulation (at a temperature higher than the glass-transition temperature) is achieved, and the application range of the shape memory polymer is greatly widened due to the excellent thermal property and mechanical property.