A polyphenol phosphate chain-extended polyurethane foam and a method for preparing the same

Abstract

The present application relates to a kind of polyphenol phosphate ester chain-extended polyurethane foam and its preparation method, belong to polyurethane technical field.The homogeneous solution of polyphenol phosphate ester with H2O is used as crosslinking foaming agent, and prepolymer, PTMEG, Tween 80, silicone oil, dibutyltin dilaurate is mixed, a kind of high strength, strong toughness, self-healing, environmental protection durable PUF material (T-P-PUF) is obtained.Compared with existing PUF, the mechanical strength of T-P-PUF is significantly improved, can reach more than 8MPa, close to ordinary non-foaming polyurethane elastomer level.The unique microstructure also enables T-P-PUF to maintain performance stability in extreme environment (such as continuous high temperature, long-term ultraviolet (UV) radiation, acid, alkali and high content metal ion environment).

Description

Technical Field

[0001] The invention relates to a polyphenol phosphate chain-extended polyurethane foam material and a preparation method thereof, belonging to the technical field of polyurethane. Background Art

[0002] Polyurethane elastomers are materials with a unique soft-hard phase separation microstructure. By varying the processing method, polyurethane elastomers with varying morphologies and properties can be obtained, resulting in unique applications in a wide range of fields. Flexible polyurethane foam (PUF) is typically synthesized via a water-blowing method. During this process, isocyanate groups react with water to form urea bonds and release carbon dioxide gas. PUFs are highly porous and offer advantages such as low density, compressive strength, thermal insulation, and damping properties. Consequently, they are widely used in building materials, thermal insulation, transportation, military equipment, and other fields.

[0003] However, current PUFs still face numerous limitations. First, the mechanical properties of PUFs, such as strength and toughness, are limited by their highly porous structure. Under significant mechanical loads or deformation, irreversible damage may occur. This porous structure easily induces stress concentration, making PUFs extremely susceptible to puncture stress. This significantly impacts the application of PUFs as engineering materials. Second, in practice, PUFs often face complex and harsh environments, including heat, radiation, and salinity. Long-term exposure to such harsh environments can lead to severe aging of the material structure, resulting in a significant and irreversible degradation of mechanical and other properties. These bottlenecks significantly restrict the application efficiency of PUFs. Therefore, there is an urgent need to develop PUFs with excellent mechanical properties, high self-healing efficiency, and durability in various environments.

[0004] Researchers are dedicated to identifying natural substances to enhance the performance of PUF materials. Plants are rich in a variety of organic compounds with unique microstructures. These include organic phosphates such as phytic acid (PA) and polyphenols such as tannic acid. Their high water solubility, high functionality, and centrosymmetric molecular structures provide ample binding sites for constructing functional polymers. Polyphenolic and phosphate groups possess a variety of physical and chemical bonding properties, such as covalent, hydrogen, ionic, and chelate bonds. However, these plant extracts are susceptible to oxidation, which significantly limits their long-term stability in applications. Furthermore, these substances readily chelate with metal ions, deactivating their functional groups and forming large-scale metal-organic aggregates. This restricts their application in contact with metal elements. Furthermore, both phytic acid and tannic acid are nucleophiles with high steric hindrance, making them difficult to undergo electrophilic reactions. This significantly limits the design and synthesis of their derivatives. Consequently, the application of plant extracts in PUFs remains very limited. Summary of the Invention

[0005] In view of this, the object of the present invention is to provide a polyphenol phosphate chain-extended polyurethane foam material and a preparation method thereof.

[0006] To achieve the above objectives, the technical solutions of the present invention are as follows.

[0007] A polyurethane foam material chain-extended by polyphenol phosphate. Based on the total mass of raw materials used to prepare the polyurethane foam material being 100%, the raw material components and their mass fractions are as follows: prepolymer: 42%-50%, polytetramethylene ether glycol (PTMEG): 45%-54.5%, Tween 80: 0.5%-1%, silicone oil: 0.5%-1%, dibutyltin dilaurate: 0.1%-0.2%, and H2O solution of polyphenol phosphate: 2%-3%.

[0008] The prepolymer is a prepolymer having an -NCO value between 12 and 14 formed by reacting diisocyanate and polytetramethylene glycol with stirring at 80 to 90° C. for 2 to 4 hours in a protective gas atmosphere;

[0009] In the H2O solution of the polyphenol phosphate, the mass fraction of the polyphenol phosphate is 70% to 75%, and the mass fraction of H2O is 25% to 30%;

[0010] The structural formula of the polyphenol phosphate is:

[0011]

[0012] Among them, any one of R1, R2, and R3 is The other two groups are -H.

[0013] Preferably, the total mass of the raw materials for preparing the prepolymer is 100%, the mass fraction of diisocyanate is 45% to 50%, and the mass fraction of polytetramethylene ether glycol is 50% to 55%.

[0014] Preferably, the molecular weight of the polytetramethylene ether glycol is 1000-2000.

[0015] Preferably, the polyphenol phosphate is prepared by the following method, which comprises the following steps:

[0016] (1) Under inert gas protection, dicyandiamide, urea, and phytic acid are dissolved in dimethyl sulfoxide (DMSO) in a mass ratio of 2-3:4-6:20, and stirred at 90-130° C. to mix and dissolve at a stirring rate of 100-200 r / min to obtain a mixture;

[0017] (2) Under a nitrogen environment, tannic acid is added to the mixture, and the mass ratio of tannic acid to phytic acid is 1:1.5-2.5; the mixture is reacted at 90-130° C. for 1-4 hours. After the reaction is completed, the mixture is centrifuged in a weak polar organic solvent, washed, vacuum dried, and ground to obtain a polyphenol phosphate; more preferably, the weak polar organic solvent is one or more of glycerol, ethyl acetate, ether, anhydrous ethanol, and anhydrous methanol.

[0018] Preferably, the polyurethane foam material has a tensile strength of 8.5 to 12.5 MPa and an elongation at break of 400% to 600%.

[0019] A method for preparing a polyphenol phosphate chain-extended polyurethane foam material according to the present invention comprises the following steps:

[0020] The polyphenol phosphate is dissolved in H2O to obtain an H2O solution of the polyphenol phosphate; then a prepolymer, PTMEG, Tween 80, silicone oil, dibutyltin dilaurate and the H2O solution of the polyphenol phosphate are mixed, stirred at 1200-1500 r / min for 10-15 seconds, poured into a mold, and cured to obtain a polyphenol phosphate chain-extended polyurethane foam material.

[0021] Beneficial effects

[0022] The present invention provides a polyurethane foam material chain-extended with polyphenol phosphates. A homogeneous solution of the polyphenol phosphates and H₂O serves as a crosslinking foaming agent. This solution is mixed with a prepolymer, PTMEG, Tween 80, silicone oil, and dibutyltin dilaurate to produce a high-strength, tough, self-healing, environmentally friendly, and durable PUF material (TP-PUF). Compared to existing PUFs, TP-PUF exhibits significantly improved mechanical strength, exceeding 8 MPa, approaching the level of conventional non-foamed polyurethane elastomers. The unique microstructure also enables TP-PUF to maintain stable performance in extreme environments, such as sustained high temperatures, prolonged ultraviolet (UV) radiation, acids, bases, and high metal ion concentrations.

[0023] The present invention provides a polyurethane foam material with chain extension using polyphenol phosphates. The polyphenol phosphates are obtained by esterifying phytic acid and tannins, and a highly hydrophilic composite is synthesized using a synergistic water absorption / dewatering technique. The structure and properties of the polyphenols are improved, a complex functionalized structure is constructed, and the functional integration of bio-based macromolecules is achieved through the complementary advantages and synergistic effects of phytic acid and tannic acid molecules. Furthermore, through the conjugation of phytic acid and tannic acid, the stability of the polymer compound is improved and the influence of metal ions is reduced. By using an aqueous solution of the polyphenol phosphate as a composite crosslinking agent, hydrogen bonds form a more uniform crosslinked structure and interaction within the material, and the homogeneous crosslinking agent facilitates the formation of a more uniform pore structure.

[0024] The present invention provides a method for preparing a polyurethane foam material chain-extended with polyphenol phosphates. The method involves dissolving a crosslinking agent, polyphenol phosphate, in H₂O to produce a homogeneous crosslinking foaming agent, thereby achieving simultaneous foaming and crosslinking. The content of polyphenol phosphate and H₂O is crucial for regulating the physical properties of the material. By adjusting the content of the crosslinking agent, polyphenol phosphate, and H₂O in the raw materials, polyurethane foam materials of varying strengths can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1-2 These are the mechanical strength test results of the polyurethane foam materials described in Examples 2-5.

[0026] Figure 3 These are the cyclic tensile test results of the polyurethane foam materials described in Example 5 and Comparative Example 1.

[0027] Figure 4-5 These are the mechanical property test results of the polyurethane foam materials described in Example 5 and Comparative Example 1 at 100°C.

[0028] Figure 6 These are the mechanical property test results of the polyurethane foam materials described in Example 5 and Comparative Example 3 after being immersed in a metal ion solution for 72 hours. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below with reference to specific embodiments.

[0030] Example 1

[0031] 1. TP preparation:

[0032] (1) Dissolve 2.5 g of the catalyst dicyandiamide, 5 g of urea, and 20 g of TA in DMSO and add the mixture to a three-necked flask. Install a water separator and condenser. Place the reaction apparatus in a thermostatic stirrer at a stirring rate of 100 rpm. Stir the raw materials until they are evenly mixed and completely dissolved. The reaction temperature is 90°C.

[0033] (2) After TA is dissolved, 20 ml of 70% PA aqueous solution is added and the mixture is reacted for 2 h under nitrogen atmosphere. The resulting solution is poured into excess anhydrous ethanol to precipitate the product, which is then centrifuged to obtain a solid.

[0034] (3) washing the product in step (2) with a solvent and then centrifuging to separate the solid, repeating the process three times to obtain a final solid product, drying it at 80° C. in a vacuum environment, and grinding it to obtain polyphenol phosphate powder (TP).

[0035] 2. TP-PUF preparation:

[0036] (1) Prepolymer synthesis: According to the ratio of IPDI:PTMEG2000=6:1, the reaction was carried out at 80°C for 2h to obtain a prepolymer.

[0037] (2) Foaming reaction: 2.0 g of TP was dissolved in 0.8 g of water. 45.5 g of prepolymer, 50 g of PTMEG2000, 2.8 g of TP aqueous solution, 0.1 g of dibutyltin dilaurate, 0.6 g of Tween 80, and 1 g of silicone oil were mixed. The mixture was rapidly stirred at 1500 r / min for 15 seconds using a shear mixer, poured into a mold, and allowed to stand for 2 hours before being removed to obtain a polyphenol phosphate chain-extended polyurethane foam material.

[0038] The structural formula of the polyphenol phosphate is:

[0039]

[0040] Among them, R1 is R2 and R3 are -H.

[0041] Example 2

[0042] 1. TP preparation:

[0043] (1) Dissolve 2.5 g of the catalyst dicyandiamide, 5 g of urea, and 20 g of TA in DMSO and add the mixture to a three-necked flask. Install a water separator and condenser. Install the reaction apparatus in a thermostatic stirrer at a stirring rate of 200 rpm. Stir the raw materials until they are evenly mixed and completely dissolved. The reaction temperature is 130°C.

[0044] (2) After TA is dissolved, 20 ml of 70% PA aqueous solution is added and the mixture is reacted for 4 h under nitrogen atmosphere. The resulting solution is poured into anhydrous ethanol to precipitate the product, which is then centrifuged to obtain a solid.

[0045] (3) washing the product in step (2) with a solvent and then centrifuging to separate the solid, repeating the process three times to obtain a final solid product, drying it at 80° C. in a vacuum environment, and grinding it to obtain polyphenol phosphate powder (TP).

[0046] 2. TP-PUF preparation:

[0047] (1) Prepolymer synthesis: According to the ratio of IPDI:PTMEG2000=6:1, the reaction was carried out at 80°C for 4 hours to obtain a prepolymer.

[0048] (2) Foaming reaction: Dissolve 2.0 g of TP in 1 g of water. Mix 50 g of prepolymer, 45.3 g of PTMEG2000, 3 g of TP aqueous solution, 0.1 g of dibutyltin dilaurate, 0.6 g of Tween 80, and 1 g of silicone oil. Stir rapidly for 15 seconds using a shear mixer at 1500 r / min, then pour into a mold for molding. After standing for 2 hours, remove the mixture and obtain a polyphenol phosphate-chain-extended polyurethane foam material, designated T-P5-PUF-1.

[0049] Example 3

[0050] 1. TP preparation:

[0051] (1) Dissolve 2.5 g of the catalyst dicyandiamide, 5 g of urea, and 20 g of TA in DMSO and add the mixture to a three-necked flask. Install a water separator and condenser. Install the reaction apparatus in a thermostatic stirrer at a stirring rate of 200 rpm. Stir the raw materials until they are evenly mixed and completely dissolved. The reaction temperature is 130°C.

[0052] (2) After TA is dissolved, 20 ml of 70% PA aqueous solution is added and the mixture is reacted for 4 h under nitrogen atmosphere. The resulting solution is poured into anhydrous ethanol to precipitate the product, which is then centrifuged to obtain a solid.

[0053] (3) washing the product in step (2) with a solvent and then centrifuging to separate the solid, repeating the process three times to obtain a final solid product, drying it at 80° C. in a vacuum environment, and grinding it to obtain polyphenol phosphate powder (TP).

[0054] 2. TP-PUF preparation:

[0055] (1) Prepolymer synthesis: According to the ratio of TDI:PTMEG2000=6:1, the reaction was carried out at 80°C for 2h to obtain a prepolymer.

[0056] (2) Foaming reaction: Dissolve 1.75 g of TP in 1 g of water. Mix 45.45 g of prepolymer, 50 g of PTMEG 2000, 2.75 g of TP aqueous solution, 0.2 g of dibutyltin dilaurate, 0.6 g of Tween 80, and 1 g of silicone oil. Stir rapidly for 15 seconds using a shear mixer at 1500 r / min, then pour into a mold for molding. After standing for 2 hours, remove the mixture and obtain a polyphenol phosphate-chain-extended polyurethane foam material, designated T-P5-PUF-2.

[0057] Example 4

[0058] 1. TP preparation:

[0059] (1) Dissolve 2.5 g of the catalyst dicyandiamide, 5 g of urea, and 20 g of TA in DMSO and add the mixture to a three-necked flask. Install a water separator and condenser. Install the reaction apparatus in a thermostatic stirrer at a stirring rate of 200 rpm. Stir the raw materials until they are evenly mixed and completely dissolved. The reaction temperature is 130°C.

[0060] (2) After TA is dissolved, 20 ml of 70% PA aqueous solution is added and the mixture is reacted for 4 h under nitrogen atmosphere. The resulting solution is poured into anhydrous ethanol to precipitate the product, which is then centrifuged to obtain a solid.

[0061] (3) washing the product in step (2) with a solvent and then centrifuging to separate the solid, repeating the process three times to obtain a final solid product, drying it at 80° C. in a vacuum environment, and grinding it to obtain polyphenol phosphate powder (TP).

[0062] 2. TP-PUF preparation:

[0063] (1) Prepolymer synthesis: According to the ratio of HDI:PTMEG2000=6:1, the reaction was carried out at 80°C for 2h to obtain a prepolymer.

[0064] (2) Foaming reaction: Dissolve 1.5 g of TP in 1 g of water. Mix 45.7 g of prepolymer, 50 g of PTMEG2000, 2.5 g of TP aqueous solution, 0.2 g of dibutyltin dilaurate, 0.6 g of Tween 80, and 1 g of silicone oil. Use a shear mixer to rapidly stir for 15 seconds at a speed of 1500 r / min, then pour into a mold for molding. After standing for 2 hours, remove the mixture and obtain a polyphenol phosphate chain-extended polyurethane foam material, designated as T-P5-PUF-3.

[0065] Example 5

[0066] 1. TP preparation:

[0067] (1) Dissolve 2.5 g of the catalyst dicyandiamide, 5 g of urea, and 20 g of TA in DMSO and add the mixture to a three-necked flask. Install a water separator and condenser. Install the reaction apparatus in a thermostatic stirrer at a stirring rate of 200 rpm. Stir the raw materials until they are evenly mixed and completely dissolved. The reaction temperature is 130°C.

[0068] (2) After TA is dissolved, 20 ml of 70% PA aqueous solution is added and the mixture is reacted for 4 h under nitrogen atmosphere. The resulting solution is poured into anhydrous ethanol to precipitate the product, which is then centrifuged to obtain a solid.

[0069] (3) washing the product in step (2) with a solvent and then centrifuging to separate the solid, repeating the process three times to obtain a final solid product, drying it at 80° C. in a vacuum environment, and grinding it to obtain polyphenol phosphate powder (TP).

[0070] 2. TP-PUF preparation:

[0071] (1) Prepolymer synthesis: According to the ratio of MDI:PTMEG2000=6:1, the reaction was carried out at 80°C for 4 hours to obtain a prepolymer.

[0072] (2) Foaming reaction: Dissolve 2 g of TP in 1 g of water. Mix 47.5 g of prepolymer, 48 g of PTMEG 2000, 3 g of TP aqueous solution, 0.2 g of dibutyltin dilaurate, 0.8 g of Tween 80, and 0.5 g of silicone oil. Stir rapidly for 15 seconds using a shear mixer at 1500 r / min, then pour into a mold for molding. After standing for 2 hours, remove the mixture and obtain a polyphenol phosphate-chain-extended polyurethane foam material, designated T-P5-PUF-4.

[0073] Comparative Example 1

[0074] 2.BDO-PUF preparation:

[0075] (1) Prepolymer synthesis: According to the ratio of IPDI:PTMEG2000=6:1, the reaction was carried out at 80°C for 2h to obtain a prepolymer.

[0076] (2) Foaming reaction: Dissolve 2.0 g of 1,4-butanediol (BDO) in 0.8 g of water. Mix 45.5 g of prepolymer, 50 g of PTMEG2000, 2.8 g of BDO aqueous solution, 0.1 g of dibutyltin dilaurate, 0.6 g of Tween 80, and 1 g of silicone oil. Use a shear mixer to rapidly stir for 15 seconds at a speed of 1500 r / min, then pour into a mold for molding. After standing for 2 hours, remove the mixture and obtain a polyphenol phosphate chain-extended polyurethane foam material. This is designated BDO-PUF-1.

[0077] Comparative Example 2

[0078] 2.BDO-PUF preparation:

[0079] (1) Prepolymer synthesis: According to the ratio of IPDI:PTMEG2000=6:1, the reaction was carried out at 80°C for 2h to obtain a prepolymer.

[0080] (2) Foaming reaction: 2.0 g of 1,4-butanediol (BDO) was dissolved in 1 g of water. The prepolymer 45.5 g, PTMEG2000 49.8 g, BDO aqueous solution 3 g, dibutyltin dilaurate 0.1 g, Tween 80 0.6 g and silicone oil 1 g were mixed, poured into the mold after rapid stirring for 15 s at a speed of 1500 r / min using a shear stirrer, and taken out after standing for 2 h to obtain a polyphenol phosphate ester chain-extended polyurethane foam material. Denoted as BDO-PUF-2.

[0081] Comparative Example 3

[0082] 2. TA-PUF preparation:

[0083] (1) Prepolymer synthesis: IPDI: PTMEG2000 = 6:1 by mole, reacted at 80°C for 2 h to obtain a prepolymer.

[0084] (2) Foaming reaction: 2.0 g of TA was dissolved in 1 g of water. The prepolymer 45.5 g, PTMEG2000 49.8 g, T-P aqueous solution 3 g, dibutyltin dilaurate 0.1 g, Tween 80 0.6 g and silicone oil 1 g were mixed, poured into the mold after rapid stirring for 15 s at a speed of 1500 r / min using a shear stirrer, and taken out after standing for 2 h to obtain a polyphenol phosphate ester chain-extended polyurethane foam material. Denoted as TA-PUF.

[0085] The polyurethane foam materials prepared in Comparative Examples 2-5 and Comparative Examples 1-2 were subjected to mechanical strength test, and the results are shown in Table 1. Figure 1-2 The tensile properties of the T-P chain-extended PUF material were significantly improved compared with the BDO chain-extended control group, and the tensile strength, elongation at break and tensile toughness were increased to 190%, 200% and 400%, respectively. The tensile strength was more than 8.5 MPa, even close to the tensile strength of non-foamed polyurethane elastomer material (about 10 MPa).

[0086] The polyurethane foam material described in Example 5 was subjected to cyclic tensile test, and the results are shown in Table 2. Figure 3 The T-P-PUF was stretched to 5 times its original length several times, during which the material could effectively absorb and dissipate external energy, avoiding fatigue damage, and showing good toughness and resilience.

[0087] The catechol structure in TP has a strong antioxidant effect, which inhibits the possible thermal oxidative aging of the material. The urethane bond formed by the phenolic hydroxyl group and the isocyanate is usually unstable and easily dissociates under the action of heat, thus affecting the thermal stability of the material. However, in this application, the conjugation effect of the phenolic hydroxyl group in TP greatly improves the structural stability. In addition, the phosphate group quenches the free radicals generated during the oxidation process and terminates further oxidation reactions. The test results are as follows Figure 4-5 As shown in the figure, after being placed in a 100°C oven for 24 hours, the mechanical strength and elongation at break of the BDO-PUF in Comparative Example 1 decreased by 26% and 11%, respectively. However, even after being placed in a high-temperature environment at 100°C for 48 hours, the mechanical strength and elongation at break of the TP-PUF did not decrease.

[0088] TA and PA have polyphenols and phosphate groups. 3+ Large complex precipitates will form in metal ion solutions. However, there is a conjugation effect between the TA and PA structures in TP, which improves the stability of the compound. Compared with TA, TP is less susceptible to metal ions. The stability test results of the material under different environments are as follows: Figure 6 As shown in the figure, the TA-PUF polyurethane foam material extended by TA is in 0.1 mol / L Fe 3+ After 72 hours of immersion in aqueous solution, the mechanical properties decreased by more than 30%, and the color of the material turned significantly black. This is because TA forms complexes with metal ions, forming large-scale stress concentration points and defects in the foam material, which deteriorates the mechanical properties of the material. Due to the conjugated stability of TP, TP-PUF is not stable in 0.1 mol / L Fe 3+ 、Cu 2+ 、Al 3+ 、Ga 2+ 、Zn 2+ The TP-PUF maintains stable performance in aqueous solutions of metal ions with strong chelating abilities. The multi-level hydrogen bonds formed between TP and the phenolic hydroxyl and phosphate groups, and the chemical cross-linking structure formed with PTMEG, enable it to maintain its basic structure insoluble in organic solvents. Prolonged immersion results in only slight swelling, with no significant change in mechanical strength or elongation at break. The TP-PUF also maintains stable performance in alkaline environments.

[0089] In summary, the invention includes but is not limited to the above embodiments. Any equivalent replacement or partial improvement made under the spirit and principle of the present invention shall be deemed to be within the scope of protection of the present invention.

Claims

1. A polyphenol phosphate chain-extended polyurethane foam material, characterized in that: Based on the total mass of raw materials for preparing the polyurethane foam material being 100%, the raw material components and their mass fractions are as follows: prepolymer: 42%-50%, polytetramethylene glycol: 45%-54.5%, Tween 80: 0.5%-1%, silicone oil: 0.5%-1%, dibutyltin dilaurate: 0.1%-0.2%, H2O solution of polyphenol phosphate: 2%-3%; The prepolymer is a prepolymer having an -NCO value between 12 and 14 formed by reacting diisocyanate and polytetramethylene ether glycol at 80-90° C. in a protective gas atmosphere for 2-4 hours with stirring; In the H2O solution of the polyphenol phosphate, the mass fraction of the polyphenol phosphate is 70% to 75%, and the mass fraction of H2O is 25% to 30%; The structural formula of the polyphenol phosphate is: ； Among them, any one of R1, R2, and R3 is , and the other two groups are -H.

2. The polyphenol phosphate chain-extended polyurethane foam material according to claim 1, wherein: Taking the total mass of raw materials for preparing the prepolymer as 100%, the mass fraction of diisocyanate is 45%-50%, and the mass fraction of polytetramethylene ether glycol is 50%-55%.

3. The polyphenol phosphate chain-extended polyurethane foam material according to claim 1, wherein: The molecular weight of the polytetramethylene ether glycol is 1000-2000.

4. The polyphenol phosphate chain-extended polyurethane foam material according to claim 1, wherein: The polyphenol phosphate is prepared by the following method, which comprises the following steps: (1) Under inert gas protection, dicyandiamide, urea and phytic acid are dissolved in dimethyl sulfoxide in a mass ratio of 2-3:4-6:20, and stirred at 90-130° C. to mix and dissolve at a stirring rate of 100-200 r / min to obtain a mixture; (2) Adding tannic acid to the mixture under a nitrogen atmosphere, wherein the mass ratio of tannic acid to phytic acid is 1:1.5-2.5; reacting at 90-130°C for 1-4 hours; after the reaction, centrifuging in a weakly polar organic solvent, washing, vacuum drying, and grinding to obtain a polyphenol phosphate.

5. The polyphenol phosphate chain-extended polyurethane foam material according to claim 4, wherein: The weakly polar organic solvent is ethyl acetate and / or diethyl ether.

6. The polyphenol phosphate chain-extended polyurethane foam material according to any one of claims 1 to 5, wherein: The polyurethane foam material has a tensile strength of 8.5-12.5 MPa and an elongation at break of 400%-600%.

7. A method for preparing a polyphenol phosphate chain-extended polyurethane foam material according to any one of claims 1 to 6, characterized in that: The method steps include: The polyphenol phosphate is dissolved in H2O to obtain an H2O solution of the polyphenol phosphate; then a prepolymer, polytetramethylene ether glycol, Tween 80, silicone oil, dibutyltin dilaurate and the H2O solution of the polyphenol phosphate are mixed, stirred at 1200-1500 r / min for 10-15 seconds, poured into a mold, and cured to obtain a polyphenol phosphate chain-extended polyurethane foam material.

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