Preparation method of bio-based polyesteramide and bio-based polyesteramide prepared by same

Abstract

The invention discloses a preparation method of bio-based polyesteramide and bio-based polyesteramide prepared by the method, and relates to the field of high polymer materials, the method comprises the following steps: (1) in a protective gas atmosphere, dissolving a 2, 5-furandicarboxylic acid compound, aliphatic diamine and a first catalyst in an organic solvent, and stirring to obtain a second solution; after a first heating reaction, a first pressure reduction reaction, a second pressure reduction reaction and a second heating reaction, a polyamide product is obtained through post-treatment; (2) in a protective gas atmosphere, carrying out a pre-polycondensation reaction on the polyamide product prepared in the step (1), bis (2-hydroxyethyl) terephthalate, dihydric alcohol and a second catalyst under a vacuum reaction condition; and (3) continuously reacting under a vacuum reaction condition to prepare the bio-based polyesteramide. According to the invention, ethylene glycol terephthalate is introduced into polyamide, so that the composition and the structure of a macromolecular chain segment are regulated and controlled, and controllable adjustments of thermal properties and the like of the material are improved.

Description

Technical Field

[0001] The present invention relates to the field of polymer materials, and more particularly to a method for preparing a bio-based polyester amide and the bio-based polyester amide prepared by the method. Background Art

[0002] Polyamide is a high-performance material with advantages such as high temperature resistance, chemical resistance, corrosion resistance, good dimensional stability, excellent mechanical properties and superior processing performance. The synthesis of traditional semi-aromatic polyamides requires petroleum-based aromatic diacids, aliphatic diamines and high temperatures above 200°C. This method accelerates the consumption of fossil raw materials on the one hand, while increasing the generation of harmful waste and emissions. Bio-based polyamides, derived from renewable resources, can reduce carbon dioxide emissions by 50% compared with petrochemical products produced using traditional energy. Aliphatic diamines are a hot topic in academic research. Some aliphatic diamines, such as 1,4-butanediamine, 1,5-pentanediamine, 1,6-hexanediamine and 1,10-decanediamine, can be produced from biomass raw materials and are potential bio-based building blocks. Bio-based 2,5-furandicarboxylic acid (FDCA) is the only bio-based aromatic monomer with a flat aromatic ring and a rigid structure, and is expected to replace terephthalic acid and isophthalic acid-based compounds. FDCA-based polymers have similar or even better thermal and mechanical properties than terephthalic acid (TPA) / isophthalic acid (IPA)-based polymers. Therefore, FDCA-based furan-aliphatic polyamides are a promising sustainable alternative and will become high-performance materials with great commercial value for further optimization and improvement.

[0003] 100% bio-based furan ring-containing polyamides have insufficient thermal properties due to the structure of the furan ring itself, which limits their application in the fields of biology, medicine and transportation. Currently reported furan-aliphatic polyamides, especially the five-carbon diamine pentamethylenediamine, have a low molecular weight and low thermal decomposition temperature due to their odd-numbered carbon linear structure, which limits their further development and application. Summary of the invention

[0004] In order to solve the problems existing in the prior art, the present invention provides a method for preparing a bio-based polyester amide and a bio-based polyester amide prepared by the method. The present invention introduces bis(hydroxyethyl) terephthalate (BHET) into polyamide, which can not only realize the high-value-added recycling of waste plastic recycling products, but also prepare a polyester amide with ester groups and amide groups distributed in the main chain of the molecule, regulate the composition and structure of the polymer chain segment, improve the thermal properties of the material, and increase its thermal decomposition temperature by more than 80 degrees.

[0005] One of the purposes of the present invention is to provide a method for preparing bio-based polyester amide.

[0006] The preparation method of the bio-based polyester amide of the present invention comprises:

[0007] (1) Under a protective gas atmosphere, a 2,5-furandicarboxylic acid compound, an aliphatic diamine and a first catalyst are dissolved in an organic solvent, subjected to a first temperature increase reaction, a first pressure reduction reaction, a second pressure reduction reaction and a second temperature increase reaction, and then post-treated to obtain a polyamide product;

[0008] (2) in a protective gas atmosphere, subjecting the polyamide product prepared in step (1), bis(hydroxyethyl) terephthalate, a diol and a second catalyst to a pre-polycondensation reaction under vacuum reaction conditions, wherein the diol can dilute the catalyst, dissolve the raw materials, and make the reaction more uniform;

[0009] (3) continuing the reaction under vacuum reaction conditions, and obtaining the bio-based polyester amide after post-treatment.

[0010] Preferably,

[0011] In step (1):

[0012] The molar ratio of the 2,5-furandicarboxylic acid compound to the aliphatic diamine is 1:(0.9-1.2), preferably 1:(0.95-1.05); and / or,

[0013] The amount of the first catalyst is 0.1 to 25 wt% of the total mass of the 2,5-furandicarboxylic acid compound and the aliphatic diamine; and / or,

[0014] The amount of the organic solvent is 200-800 wt % of the total mass of the 2,5-furandicarboxylic acid compound and the aliphatic diamine, preferably 400-600 wt %.

[0015] Preferably,

[0016] In step (2):

[0017] The amount of bis(hydroxyethyl) terephthalate is 0.5-90wt%, preferably 14-87wt%, of the total mass of bis(hydroxyethyl) terephthalate and the polyamide product; and / or

[0018] The amount of the diol is 10-35wt% of the total mass of the bis(hydroxyethyl) terephthalate and the polyamide product, preferably 15-25wt%; and / or,

[0019] The amount of the second catalyst is 0.01-1 wt % of the total mass of the bis(hydroxyethyl) terephthalate and the polyamide product, preferably 0.03-0.08 wt %.

[0020] Preferably,

[0021] In step (1):

[0022] The 2,5-furandicarboxylic acid compound is at least one of 2,5-furandicarboxylic acid, dimethyl 2,5-furandicarboxylate, diethyl 2,5-furandicarboxylate, and 2,5-furandicarboxylic acid chloride; and / or,

[0023] The aliphatic diamine is a bio-based aliphatic diamine, preferably at least one of butanediamine, pentamethylenediamine, hexamethylenediamine, octanediamine and decanediamine; and / or,

[0024] The first catalyst is a metal catalyst or a lipase; preferably, the metal catalyst is at least one of a zinc-containing compound, an organic tin compound, and an organic titanium compound; more preferably, the zinc-containing compound is at least one of zinc citrate, zinc oxide, zinc halide, and zinc gluconate; and / or,

[0025] When the first catalyst is lipase, the amount used is 5-25wt% of the total weight of the 2,5-furandicarboxylic acid compound and the aliphatic diamine; when the first catalyst is a metal catalyst, the amount used is 0.1-5wt% of the total weight of the 2,5-furandicarboxylic acid compound and the aliphatic diamine; and / or,

[0026] The organotin compound is at least one of stannous octoate, stannous oxalate, dibutyltin oxide, butyltin acid, diethyl dibutyltin, dioctyltin oxide, and monobutyltin triisooctoate; and / or,

[0027] The organic titanium compound is at least one of tetrabutyl titanate, isopropyl titanate, tetraethyl titanate and ethylene glycol titanium; and / or,

[0028] The lipase is a lipase commonly used in the art, such as at least one of Novozymes 435 lipase, CALB lipase, TM lipase, TL lipase, RM lipase, and Purolite 435 lipase; and / or,

[0029] The organic solvent is at least one of toluene, diphenyl ether, xylene, N-methylpyrrolidone and dimethylacetamide.

[0030] Preferably,

[0031] In step (2):

[0032] The diol is a straight-chain aliphatic diol or a branched aliphatic diol; preferably, the diol has 2 to 8 carbon atoms; and / or,

[0033] The second catalyst is at least one of a titanium-containing compound, an antimony-containing compound, a germanium-containing compound, a zirconium-containing compound, a tin-containing compound, a magnesium-containing compound, a cobalt-containing compound, an aluminum-containing compound or a zinc-containing compound.

[0034] Preferably,

[0035] The bis(hydroxyethyl) terephthalate in step (2) is prepared by chemical alcoholysis of polyethylene terephthalate.

[0036] Preferably,

[0037] In step (1):

[0038] The first heating reaction temperature is 60-120°C, and / or the reaction time is 6-10h, and / or the heating rate is 10-20°C / h; and / or,

[0039] The first decompression reaction pressure is 40-80 kPa, and / or the reaction time is 12-24 h; and / or,

[0040] The second decompression reaction pressure is 10-30 kPa, and / or the reaction time is 24-40 hours; and / or,

[0041] The second heating reaction temperature is 120-160°C, and / or the reaction time is 12-24h, and / or the heating rate is 10-20°C / h; and / or,

[0042] The post-treatment includes: precipitation, filtration, washing and drying; preferably, the precipitant used in the precipitation process is at least one of methanol, ethanol, isopropanol, acetonitrile, dioxane and dichloromethane.

[0043] Preferably,

[0044] In step (2):

[0045] The vacuum reaction condition is 1000-5000 Pa; and / or,

[0046] The pre-polycondensation reaction temperature is 140-210° C., preferably 190-210° C., and / or the reaction time is 0.5-2.5 hours, preferably 1-1.5 hours.

[0047] Preferably,

[0048] In step (3):

[0049] The vacuum reaction condition is ≤300Pa, preferably ≤50Pa; and / or,

[0050] The continued reaction temperature is 210-260° C., preferably 220-250° C., and / or the reaction time is 1-5 hours, preferably 2-3 hours; and / or,

[0051] The post-treatment is a conventional post-treatment method in the art, such as precipitation, filtration, washing, drying and other steps. Those skilled in the art can adjust according to actual conditions. Specifically, the product can be precipitated in methanol, filtered, washed, and dried at 40° C. for 48 hours.

[0052] The following solutions can be adopted:

[0053] Under the protection of inert gas, 2,5-furandicarboxylic acid compound, aliphatic diamine and the first catalyst are dissolved in an organic solvent, heated to 60-120° C., and reacted for 6-10 hours; the system is decompressed to 40-80 kPa within 1 hour, and reacted at the pressure for 12-24 hours; the system is decompressed to 10-30 kPa within 1 hour, and reacted at the pressure for 24-40 hours; the system is heated to 120-160° C., and the reaction is continued for 12-24 hours; after the reaction, the polyamide product is precipitated in a precipitant, filtered, washed, and dried at 40° C. for 48 hours;

[0054] Under the protection of inert gas, the polyamide product, bis(hydroxyethyl) terephthalate (BHET), diol and the second catalyst are added into a reactor to carry out a pre-polycondensation reaction, and vacuum reaction conditions are gradually established within 1 hour, so that the vacuum degree is maintained between 1000 and 5000 Pa, the reaction temperature is 140 to 210° C., and the reaction time is 0.5 to 2.5 hours;

[0055] The vacuum degree is controlled at ≤300 Pa, the reaction temperature is 210-260° C., the reaction time is 1-5 hours, the product is precipitated in methanol, filtered, washed, and dried at 40° C. for 48 hours to prepare the bio-based polyester amide.

[0056] The second object of the present invention is to provide a bio-based polyester amide obtained by the preparation method of bio-based polyester amide.

[0057] The bio-based polyester amide of the present invention has the structural formula:

[0058]

[0059] Wherein n is 4 to 12; x is 10 to 250; y is 2 to 250.

[0060] The thermodynamic deficiencies of all-biobased furan ring-containing polyamides affect their application in the field of materials due to the influence of the furan ring structure itself. The present invention introduces ethylene terephthalate (BHET) into polyamide, wherein BHET can be chemically recovered from waste PET through alcohol depolymerization, which can not only achieve high added value recycling of waste plastic recycling products, but also prepare polyester amides with ester bonds and amide bonds distributed in the main chain of the molecule, regulate the composition and structure of the polymer chain segments, and improve the controllable regulation of the thermal properties of the material. Compared with polyamides without the introduction of polyester, the thermal decomposition temperature can be increased by more than 80 degrees, reaching more than 230°C. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 This is the TGA graph of the bio-based polyester amide prepared in Example 1;

[0062] Figure 2 This is the TGA graph of the bio-based polyester amide prepared in Example 2;

[0063] Figure 3 This is the TGA graph of the bio-based polyester amide prepared in Example 3;

[0064] Figure 4 NMR comparison of the polyamide product prepared in Comparative Example 1 (upper) and the bio-based polyesteramide prepared in Example 3 (lower);

[0065] Figure 5 This is the TGA chart of the polyamide product prepared in Comparative Example 1. DETAILED DESCRIPTION

[0066] The present invention is described in detail below in conjunction with specific drawings and embodiments. It is necessary to point out that the following embodiments are only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made to the present invention by those skilled in the art based on the content of the present invention still fall within the scope of protection of the present invention.

[0067] The raw materials used in the examples and comparative examples of the present invention are all commercially available products.

[0068] Example 1

[0069] Under the protection of inert gas, 14.7g of dimethyl 2,5-furandicarboxylate, 8.18g of pentamethylenediamine and 4.56g of Novozymes immobilized lipase N435 were dissolved in 120g of toluene, heated to 90°C, heated at a rate of 20°C / h, and reacted for 10h; the system was decompressed to 60kPa within 1 hour, and reacted at the pressure for 24h; the system was decompressed to 20kPa within 1 hour, and reacted at the pressure for 36h; the system was heated to 140°C, heated at a rate of 20°C / h, and continued to react for 24h; formic acid was added and stirred until completely dissolved, dioxane was added for precipitation, suction filtered, washed, and dried at 40°C for 48h; a polyamide product was prepared;

[0070] Under the protection of inert gas, 1.37 g of bis(hydroxyethyl) terephthalate, 8.25 g of the above polyamide product, 2.75 g of ethylene glycol, and 15 mg of ethylene glycol antimony were added to the reactor, and the vacuum degree was maintained below 2000 Pa within 1 hour. The reaction temperature was 190° C. and the reaction time was 1 hour.

[0071] The vacuum degree was controlled at ≤150Pa, the reaction temperature was 240°C, the reaction time was 2 hours, and after the reaction, the product was precipitated in methanol, filtered, washed, and dried at 40°C for 48 hours to prepare a bio-based polyester amide.

[0072] The final bio-based polyester amide is bonded by furan dicarboxamide and ethylene terephthalate, with a glass transition temperature of 40°C and an initial decomposition temperature of T d,5％ The temperature was 162°C and the yield was 78%.

[0073] Example 2

[0074] Under the protection of inert gas, 14.7g of dimethyl 2,5-furandicarboxylate, 8.18g of pentamethylenediamine, 0.03g of stannous octoate and 0.03g of zinc chloride were dissolved in 120g of diphenyl ether, and the temperature was raised to 90°C at a heating rate of 20°C / h, and the reaction was carried out for 10h; the system was decompressed to 60kPa within 1 hour, and the reaction was carried out under the pressure for 24h; the system was decompressed to 20kPa within 1 hour, and the reaction was carried out under the pressure for 36h; the system was heated to 140°C at a heating rate of 20°C / h, and the reaction was continued for 24h; after the reaction, the polyamide prepolymer was precipitated in dioxane, filtered, washed, and dried at 40°C for 48h, with a yield of 66%, to prepare a polyamide product;

[0075] Under the protection of inert gas, 1.37 g of bis(hydroxyethyl) terephthalate, 8.25 g of the above polyamide product, 2.75 g of ethylene glycol, and 15 mg of ethylene glycol antimony were added to the reactor, and the vacuum degree was maintained below 2000 Pa within 1 hour. The reaction temperature was 190° C. and the reaction time was 1 hour.

[0076] The vacuum degree was controlled at ≤150Pa, the reaction temperature was 240°C, the reaction time was 2 hours, and after the reaction, the product was precipitated in methanol, filtered, washed, and dried at 40°C for 48 hours to prepare a bio-based polyester amide.

[0077] The final bio-based polyester amide is bonded by furan dicarboxamide and ethylene terephthalate, and its initial decomposition temperature T d,5％ The temperature was 189°C and the yield was 80%.

[0078] Example 3

[0079] Under the protection of inert gas, 14.7g of dimethyl 2,5-furandicarboxylate, 8.18g of pentamethylenediamine, 0.03g of stannous octoate and 0.03g of zinc chloride were dissolved in 120g of diphenyl ether, and the temperature was raised to 100°C at a heating rate of 20°C / h, and the reaction was carried out for 10h; the system was decompressed to 60kPa within 1 hour, and the reaction was carried out under the pressure for 24h; the system was decompressed to 20kPa within 1 hour, and the reaction was carried out under the pressure for 36h; the system was heated to 140°C at a heating rate of 20°C / h, and the reaction was continued for 24h; after the reaction, the polyamide prepolymer was precipitated in dioxane, filtered, washed, and dried at 40°C for 48h, with a yield of 61%, to prepare a polyamide product;

[0080] Under the protection of inert gas, 8.23 ​​g of bis(hydroxyethyl) terephthalate, 1.25 g of the above polyamide product, 3 g of ethylene glycol, and 28 mg of ethylene glycol antimony were added to the reactor, and the vacuum degree was maintained below 2000 Pa within 1 hour. The reaction temperature was 190° C. and the reaction time was 1 hour.

[0081] The vacuum degree was controlled at ≤150Pa, the reaction temperature was 240°C, the reaction time was 2 hours, and after the reaction, the product was precipitated in methanol, filtered, washed, and dried at 40°C for 48 hours to prepare a bio-based polyester amide.

[0082] The final bio-based polyester amide is bonded by furan dicarboxamide and ethylene terephthalate, with a glass transition temperature of 94°C and an initial decomposition temperature of T d,5％ The temperature was 236°C and the yield was 85%.

[0083] Example 4

[0084] Under the protection of inert gas, 14.7g of dimethyl 2,5-furandicarboxylate, 6.35g of dibutylene and 0.94g of Novozymes immobilized lipase N435 were dissolved in 75.4g of xylene, heated to 80°C, heated at a rate of 20°C / h, and reacted for 10h; the system was decompressed to 40kPa within 1 hour, and reacted at the pressure for 24h; the system was decompressed to 10kPa within 1 hour, and reacted at the pressure for 40h; the system was heated to 120°C, heated at a rate of 20°C / h, and continued to react for 24h; formic acid was added and stirred until completely dissolved, methanol was added, filtered, washed, and dried at 40°C for 48h; a polyamide product was prepared;

[0085] Under the protection of inert gas, 5 g of bis(hydroxyethyl) terephthalate, 5 g of the above polyamide product, 1.5 g of 1,2-propylene glycol, and 3 mg of tetrabutyl titanate were added to the reactor, and the vacuum degree was kept below 2000 Pa within 1 hour. The reaction temperature was 190° C. and the reaction time was 1.5 hours.

[0086] The vacuum degree was controlled at ≤50Pa, the reaction temperature was 220°C, the reaction time was 3 hours, and after the reaction, the product was precipitated in methanol, filtered, washed, and dried at 40°C for 48 hours to prepare a bio-based polyester amide.

[0087] Example 5

[0088] Under the protection of inert gas, 17g of diethyl 2,5-furandicarboxylate, 11.16g of hexamethylenediamine, 0.71g of isopropyl titanate and 0.71g of zinc oxide were dissolved in 168.96g of toluene, heated to 120°C, heated at a rate of 20°C / h, and reacted for 6h; the system was decompressed to 80kPa within 1 hour, and reacted at the pressure for 12h; the system was decompressed to 30kPa within 1 hour, and reacted at the pressure for 24h; the system was heated to 160°C, heated at a rate of 20°C / h, and continued to react for 12h; formic acid was added and stirred until completely dissolved, methanol was added, filtered, washed, and dried at 40°C for 48h; a polyamide product was prepared;

[0089] Under the protection of inert gas, 5 g of bis(hydroxyethyl) terephthalate, 5 g of the above polyamide product, 2.5 g of 1,2-butanediol, and 8 mg of dioctyltin oxide were added to the reactor, and the vacuum degree was maintained below 4000 Pa within 1 hour. The reaction temperature was 210° C. and the reaction time was 1 hour.

[0090] The vacuum degree was controlled at ≤50Pa, the reaction temperature was 250°C, the reaction time was 2 hours, and after the reaction, the product was precipitated in methanol, filtered, washed, and dried at 40°C for 48 hours to prepare a bio-based polyester amide.

[0091] Comparative Example 1

[0092] Under the protection of inert gas, 14.7g of dimethyl 2,5-furandicarboxylate, 8.18g of pentamethylenediamine and 4.56g of N435 were dissolved in 120g of toluene, heated to 90°C, and reacted for 10h; the system was decompressed to 60kPa within 1 hour, and reacted at this pressure for 24h; the system was decompressed to 20kPa within 1 hour, and reacted at this pressure for 36h; the system was heated to 140°C, and the reaction continued for 24h; after the reaction, the polyamide prepolymer was precipitated in dioxane, filtered, washed, and dried at 40°C for 48h; the initial decomposition temperature of the obtained polyamide product was T d,5％ The temperature of the bio-based polyester amide introduced with polyester can be increased by more than 80 degrees compared with Examples 1-3. It can be seen from Examples 2-3 that as the amount of BHET added increases, its proportion in the final polymer increases, the heat resistance of the polyamide is improved, and the decomposition temperature is increased.

[0093] Depend on Figure 4 The nuclear magnetic resonance signal shows that by comparing the spectra of the polyamide prepolymers of Example 3 and Comparative Example 1 after adding BHET modification, it is found that the end group signal at 2.8ppm is not obvious, proving that copolymerization reaction has occurred between polyamide and BHET, and the molar ratio of repeating units is about 8.4:1.

[0094] Comparative Example 2

[0095] Under the protection of inert gas, 14.73g of methyl 2,5-furandicarboxylate, 4.08g of pentamethylenediamine, 10.16g of bis(hydroxyethyl) terephthalate, and 5.78g of N435 were dissolved in 140g of toluene, heated to 90°C, and reacted for 10h; the system was decompressed to 60kPa within 1 hour, and reacted at this pressure for 24h; the system was decompressed to 20kPa within 1 hour, and reacted at this pressure for 36h; the system was heated to 140°C, and the reaction was continued for 24h;

[0096] Then, the vacuum degree was maintained below 2000 Pa within 1 hour, the reaction temperature was 190° C., and the reaction time was 1 hour;

[0097] The vacuum degree was controlled at ≤150Pa, the reaction temperature was 240℃, the reaction time was 2 hours, and after the reaction, the product was precipitated in methanol, filtered, washed, and dried at 40℃ for 48 hours. However, the yield of the synthesized polyester amide was 45%, and the initial decomposition temperature T d,5％ The lower yield is mainly due to the fact that the bis(hydroxyethyl)terephthalate monomer added to the initial raw materials of the reaction destroys the molar ratio balance of furanyl dibasic ester and diamine, thereby affecting the reaction and the increase of molecular weight, and further affecting the heat resistance of the material.

Claims

1. A method for preparing bio-based polyester amide, characterized in that The method comprises: (1) Under a protective gas atmosphere, a 2,5-furandicarboxylic acid compound, an aliphatic diamine and a first catalyst are dissolved in an organic solvent, subjected to a first temperature increase reaction, a first pressure reduction reaction, a second pressure reduction reaction and a second temperature increase reaction, and then post-treated to obtain a polyamide product; (2) in a protective gas atmosphere, subjecting the polyamide product prepared in step (1), bis(hydroxyethyl) terephthalate, a diol and a second catalyst to a pre-polycondensation reaction under vacuum reaction conditions; (3) continuing the reaction under vacuum reaction conditions to obtain the bio-based polyester amide.

2. The preparation method according to claim 1, characterized in that: In step (1): The molar ratio of the 2,5-furandicarboxylic acid compound to the aliphatic diamine is 1:(0.9-1.2), preferably 1:(0.95-1.05); and / or, The first catalyst is used in an amount of 0.1 to 25 wt% of the total weight of the 2,5-furandicarboxylic acid compound and the aliphatic diamine, and / or The amount of the organic solvent is 200-800 wt %, preferably 400-600 wt %, based on the total weight of the 2,5-furandicarboxylic acid compound and the aliphatic diamine.

3. The preparation method according to claim 1, characterized in that: In step (2): The amount of bis(hydroxyethyl) terephthalate is 0.5-90wt%, preferably 14-87wt%, of the total weight of bis(hydroxyethyl) terephthalate and the polyamide product; and / or The amount of the diol is 10-35wt%, preferably 15-25wt%, of the total weight of the bis(hydroxyethyl) terephthalate and polyamide product; and / or The amount of the second catalyst is 0.01-1 wt % of the total weight of the bis(hydroxyethyl) terephthalate and the polyamide product, preferably 0.03-0.08 wt %.

4. The preparation method according to claim 1, characterized in that: In step (1): The 2,5-furandicarboxylic acid compound is at least one of 2,5-furandicarboxylic acid, dimethyl 2,5-furandicarboxylate, diethyl 2,5-furandicarboxylate, and 2,5-furandicarboxylic acid chloride; and / or, The aliphatic diamine is a bio-based aliphatic diamine, preferably at least one of butanediamine, pentamethylenediamine, hexamethylenediamine, octanediamine and decanediamine; and / or, The first catalyst is a metal catalyst or a lipase; preferably, the metal catalyst is at least one of a zinc-containing compound, an organic tin compound, and an organic titanium compound; more preferably, the zinc-containing compound is at least one of zinc citrate, zinc oxide, zinc halide, and zinc gluconate; and / or, When the first catalyst is lipase, the amount used is 5-25wt% of the total weight of the 2,5-furandicarboxylic acid compound and the aliphatic diamine; when the first catalyst is a metal catalyst, the amount used is 0.1-5wt% of the total weight of the 2,5-furandicarboxylic acid compound and the aliphatic diamine; and / or, The organotin compound is at least one of stannous octoate, stannous oxalate, dibutyltin oxide, butyltin acid, diethyl dibutyltin, dioctyltin oxide, and monobutyltin triisooctoate; and / or, The organic titanium compound is at least one of tetrabutyl titanate, isopropyl titanate, tetraethyl titanate and ethylene glycol titanium; and / or, The organic solvent is at least one of toluene, diphenyl ether, xylene, N-methylpyrrolidone and dimethylacetamide.

5. The preparation method according to claim 1, characterized in that: In step (2): The diol is a straight-chain aliphatic diol or a branched aliphatic diol; preferably, the diol has 2 to 8 carbon atoms; and / or, The second catalyst is at least one of a titanium-containing compound, an antimony-containing compound, a germanium-containing compound, a zirconium-containing compound, a tin-containing compound, a magnesium-containing compound, a cobalt-containing compound, an aluminum-containing compound or a zinc-containing compound.

6. The preparation method according to claim 1, characterized in that: The bis(hydroxyethyl) terephthalate in step (2) is prepared by chemical alcoholysis of polyethylene terephthalate.

7. The preparation method according to claim 1, characterized in that: In step (1): The first heating reaction temperature is 60-120°C, and / or the reaction time is 6-10h, and / or the heating rate is 10-20°C / h; and / or, The first decompression reaction pressure is 40-80 kPa, and / or the reaction time is 12-24 h; and / or, The second decompression reaction pressure is 10-30 kPa, and / or the reaction time is 24-40 hours; and / or, The second heating reaction temperature is 120-160°C, and / or the reaction time is 12-24h, and / or the heating rate is 10-20°C / h; and / or, The post-treatment includes: precipitation, filtration, washing and drying; preferably, the precipitant used in the precipitation process is at least one of methanol, ethanol, isopropanol, acetonitrile, dioxane and dichloromethane.

8. The preparation method according to claim 1, characterized in that: In step (2): The vacuum reaction condition is 1000-5000 Pa; and / or, The pre-polycondensation reaction temperature is 140-210° C., preferably 190-210° C., and / or the reaction time is 0.5-2.5 hours, preferably 1-1.5 hours.

9. The preparation method according to claim 1, characterized in that: In step (3): The vacuum reaction condition is ≤300Pa, preferably ≤50Pa; and / or, The continued reaction temperature is 210-260° C., preferably 220-250° C., and / or the reaction time is 1-5 hours, preferably 2-3 hours.

10. A bio-based polyester amide obtained by the preparation method according to any one of claims 1 to 9, characterized in that The bio-based polyester amide structural formula is: Wherein n is 4 to 12; x is 10 to 250; y is 2 to 250.

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