High-elasticity composition, preparation method therefor, and use thereof

Abstract

The present invention provides a high-elasticity composition, a preparation method therefor, and a use thereof. The elastic composition comprises P3HB4HB and P4HB, the molar content of the repeating unit 4HB in P3HB4HB being ≥25%, and the mass ratio of P3HB4HB to P4HB being (4:1)-(1:4). The high-elasticity composition of the present invention has the advantages of marine degradability, low modulus, high elasticity, low shrinkage and low warpage, and can replace TPU for use in products such as 3D printing, leather, and soft toys.

Description

Highly elastic compositions, their preparation methods and applications

[0001] Cross-referencing

[0002] This application claims priority to Chinese Patent Application No. 2024107148624, filed on June 4, 2024, entitled “Highly Elastic Composition and Preparation Method Thereof and Application Thereof,” the entire disclosure of which is incorporated herein by reference. Technical Field

[0003] This invention relates to the field of biodegradable polymer materials, and more particularly to a highly elastic composition, its preparation method, and its application. Background Technology

[0004] In recent years, 3D printing, or rapid prototyping technology, has developed rapidly. Materials such as PEEK (polyetheretherketone), PLA (polylactic acid), nylon, and TPU (thermoplastic polyurethane elastomer) can meet different needs. Among them, for flexible and high-resilience materials, only TPU filaments are relatively mature at present. However, on the one hand, its processing temperature is high and the printing speed is slow; on the other hand, TPU is a non-degradable material, which is not environmentally friendly, and it also has problems such as high shrinkage and easy warping.

[0005] With the popularization of low-carbon and environmentally friendly concepts, people are beginning to favor biodegradable materials, especially marine-degradable materials. Among these, PHA (polyhydroxyalkanoates) has become the most promising biodegradable material. However, most types of PHA face problems such as narrow thermal processing windows, poor performance, and slow crystallization during processing and application. For applications requiring high elasticity and dimensional stability, such as 3D printing flexible consumables, leather, and soft toys, relying on a single type of PHA material is insufficient.

[0006] Therefore, there is an urgent need to develop a marine-degradable composition with low modulus, high elasticity, low shrinkage, and low warpage that can replace TPU to meet environmental protection and practical application requirements. Summary of the Invention

[0007] The present invention aims to solve at least one of the problems of the prior art.

[0008] This invention provides a highly elastic composition, its preparation method, and its application. The highly elastic composition can meet the requirements of being marine-degradable, having low modulus, high elasticity, low shrinkage, and low warpage, resulting in environmentally friendly, low-carbon, and high-performance flexible products.

[0009] In a first aspect, the present invention provides an elastic composition comprising P3HB4HB and P4HB; wherein the molar content of the repeating unit 4HB in P3HB4HB is ≥25%, and the mass ratio of P3HB4HB to P4HB is (4:1)-(1:4).

[0010] In some embodiments of the present invention, the molar content of the repeating unit 4HB in P3HB4HB is 25%-75%, preferably 26%-40%.

[0011] In some specific embodiments of the present invention, the molar content of the repeating unit 4HB of P3HB4HB is 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 50%, 60%, 65%, 70%, or 75%.

[0012] The elastic composition of the present invention, using a specific 4HB molar content (especially 25%-75%) of P3HB4HB and P4HB combination, has unexpectedly shown to be more effective than using P3HB4HB or P4HB alone, and also better than the combination of PHB and P4HB. Experiments have shown that when the main material is only P4HB, the resulting 3D printing material has a relatively hard texture, high modulus, and a hardness of 98A or higher, which cannot cover more flexible hardness and limits its application range. When the main material is only P3HB4HB (with 4HB molar content of 25%-75%), although the system also contains only 3HB and 4HB polymers and the material is flexible and amorphous, its cooling and solidification speed is too slow, making it difficult to granulate, prepare filaments, or 3D print smoothly, and causing problems such as large shrinkage, adhesion, and warping, making it unusable. When the main material is PHB and P4HB, although the system also contains only 3HB and 4HB polymers, the overall texture is more rigid, no longer suitable for flexible additive manufacturing, and cannot meet the requirements of TPU.

[0013] Only by blending the two types of PHA in a specific ratio (P3HB4HB to P4HB mass ratio of 4:1-1:4) can the rapid crystallization and curing speed of P4HB be utilized to improve the overall curing speed, thereby reducing problems such as high shrinkage and warping. Furthermore, the flexibility of P3HB4HB can be used to further enhance the overall elasticity, reduce the modulus, and expand the hardness gradient of the composition (70-95A), thus broadening its applicability. Beyond this ratio, the composition will not combine the advantages of both PHAs and will be no different from using either PHA alone.

[0014] In some embodiments of the present invention, the mass ratio of P3HB4HB to P4HB in the elastic composition is (3:1)-(1:3).

[0015] In some specific embodiments of the present invention, the mass ratio of P3HB4HB to P4HB in the elastic composition is 4:1, 3.9:1, 3.5:1, 3:1, 2:1, 1:1, 1:1.9, 1:2, 1:3, 1:3.5, 1:3.9 or 1:4.

[0016] In some embodiments of the present invention, the weight-average molecular weight of P3HB4HB is 200,000 to 2,000,000, preferably 350,000 to 700,000; more preferably PDI ≤ 3, or PDI 2.5 to 2.9.

[0017] In some specific embodiments of the present invention, the weight-average molecular weight of P3HB4HB is 200,000, 250,000, 300,000, 350,000, 400,000, 450,000, 500,000, 550,000, 600,000, 680,000, 700,000, 1,000,000, or 2,000,000.

[0018] In some specific embodiments of the present invention, the PDI of P3HB4HB is 2.5, 2.6, 2.7, 2.8 or 2.9.

[0019] In some embodiments of the present invention, the weight-average molecular weight of the P4HB is 60,000-150,000, preferably 100,000-120,000; more preferably PDI≤2, or PDI is 1.6-1.7.

[0020] In some specific embodiments of the present invention, the weight-average molecular weight of P4HB is 60,000, 60,000, 80,000, 90,000, 100,000, 105,000, 110,000, 120,000, 130,000, 140,000, and 150,000.

[0021] In some specific embodiments of the present invention, the PDI of the P4HB is 1.6, 1.65, or 1.7.

[0022] When the weight-average molecular weight (PDI) of poly(3-hydroxybutyrate-co-4-hydroxybutyrate), i.e., P3HB4HB and poly(4-hydroxybutyric acid), is greater than 200,000, the materials exhibit basic mechanical properties, which is conducive to smooth processing and molding. Conversely, if the molecular weight is less than 200,000, the material may be in a semi-solid state and have poor thermal stability. A smaller PDI value indicates a more uniform molecular weight distribution, which helps reduce the frequency of process adjustments. Otherwise, a wide molecular weight distribution will lead to differences in raw materials, making it difficult for downstream processing plants or product manufacturers to use consistent parameters to process the raw materials, requiring frequent adjustments during processing, which is not conducive to continuous production. A narrower PDI distribution is beneficial to improving the consistency of raw materials and finished products and reducing the production cost of finished products.

[0023] In some embodiments of the present invention, the elastic composition is composed of P3HB4HB and P4HB in the proportions described above.

[0024] In some embodiments of the present invention, the elastic composition may further include other polyhydroxyalkanoate homopolymers or copolymers without affecting the properties of the elastic composition. However, to achieve good results, the sum of the masses of P3HB4HB and P4HB in the elastic composition must account for ≥60% by mass, for example, 70%-98%.

[0025] Furthermore, the elastic composition may also include additives, wherein the additives include one or more of nucleating agents, heat stabilizers, antioxidants, reinforcing agents, plasticizers, anti-hydrolysis agents, and fillers.

[0026] Preferably, based on the mass of the elastic composition, the amount of nucleating agent added is 0.01-2%, the amount of heat stabilizer added is 0.1-2%, the amount of antioxidant added is 0.1-2%, the amount of reinforcing agent added is 0.1-5%, the amount of plasticizer added is 0.1-5%, the amount of anti-hydrolysis agent added is 0.1-2%, and the amount of filler added is 0.1%-30%.

[0027] Furthermore, the nucleating agent includes one or more of the following: hexagonal crystal structure compounds (boron nitride, silicon nitride, titanium nitride, boron carbide, silicon carbide, titanium carbide, magnesium oxide, aluminum oxide), pyrimidines (uracil, thymine, cytosine), purines (adenine, guanine), dicarboxylic acid salicylhydrazide, melamine, sugar alcohols (pentaerythritol, isosorbide, sorbitol, mannitol, maltitol, erythritol), fatty acid amides [EBS (ethylene bis-stearamide), erucamide, oleamide, linoleamide, palmitamide], Shanxi Chemical Research Institute TMC300 and TMC 306, Jinan Chengju AD-506, AD-516, CE-208 and CE-301.

[0028] Furthermore, the heat stabilizer includes one or more of 2-ethylhexanoate, stearate (zinc stearate, calcium stearate), and laurate (calcium laurate).

[0029] Further, the antioxidant includes one or more of the following: antioxidant 1010, antioxidant 1076, antioxidant BHT, antioxidant 1098, antioxidant 245, antioxidant 168, antioxidant DSTP, antioxidant 412S, antioxidant DLTP, antioxidant PEPQ, TNK-01, KSJ-936, DuPont 132F NC010, Rasig STABILIZER 7000, Rhein Chemicals Stabaxol P, and Doverphos S-9228.

[0030] Furthermore, the reinforcing agent includes one or more of nanocellulose, nanomontmorillonite, nanocalcium carbonate, and nanosilica.

[0031] Further, the plasticizer includes one or more of the following: isosorbide dioctanoate, acetylated dimethyl ricinoleate, epoxy tetrahydrophthalate, castor oil, polyethylene glycol series, polypropylene glycol series, tributyl acetylacetonate, tributyl acetylacetonate, epoxidized soybean oil, glycerin, triacetyl ester, fatty acids (laccosine, tetradecanoic acid, hexadecanoic acid, octadecanoic acid, eicosanoic acid, docosanoic acid, icosahicosanoic acid, icosahicosanoic acid, icosahicosanoic acid, triacontanic acid), and fatty alcohols (dodecanol, tetradecanol, hexadecanol, octadecanol, eicosanool, docosanool, icosahicosanool, icosahicosanool, triacontanol, tridodecanol).

[0032] Furthermore, the anti-hydrolysis agent includes one or more of carbodiimide, polycarbodiimide, HyMax 210, double bond anti-hydrolysis agent CHINOX P-500, DuPont 132F NC010, anti-hydrolysis stabilizer 3600, and KANEKA M732.

[0033] Furthermore, the filler includes one or more of the following: talc, modified talc, silica, montmorillonite, starch, pregelatinized starch, barium sulfate, calcium carbonate, aluminum hydroxide, kaolin, bentonite, chitin, titanium dioxide, cellulose, lignin, coffee grounds, tea grounds, orange peel residue, seaweed powder, sugarcane bagasse, turmeric residue, rose residue, corn residue, eggshell residue, soybean residue, and rice residue.

[0034] In some embodiments of the present invention, the amount of filler added is 4%-30% based on the mass of the elastic composition, optionally 8%-25%.

[0035] In some embodiments of the present invention, the filler of the elastic composition may be micron-sized biomass waste residue, such as one or more of cellulose, lignin, coffee grounds, tea residue, orange peel residue, seaweed powder, sugarcane bagasse, turmeric residue, rose residue, corn residue, eggshell residue, soybean residue, and rice residue. The particle size of the biomass waste residue is 1-30 micrometers (approximately 500-12500 mesh). Tests have shown that biomass waste residue within this particle size range does not affect the printing effect of the final consumable product, will not clog the printing head due to excessively coarse particle size, and remains above the micron scale.

[0036] These biomass waste residues not only enhance environmental friendliness but also create a synergistic effect with P4HB, jointly accelerating the thermal curing speed of the composition, further reducing shrinkage and warping, and improving the final dimensional stability of molded parts (such as 3D printed products) prepared from elastic compositions.

[0037] The low density of biomass waste reduces the overall weight of the elastic composition, facilitating transportation. Furthermore, the high 4HB molar content of P3HB, 4HB, and P4HB, with their low melting points, unexpectedly resulted in a reinforcing and toughening effect when blended with the biomass waste. This is likely due to the low processing temperature, which prevents the biomass waste from carbonizing, thus preserving higher mechanical properties and more organic matter. These organic substances exhibit good coupling with the PHA composition and compensate for defects within the system at the micron scale, thereby enhancing strength and toughness. Simultaneously, the low-temperature processing retains more of the natural aroma and color, allowing for more personalized choices and sensory experiences in flexible additive manufacturing.

[0038] In some embodiments of the present invention, the tensile strength of the elastic composition is ≥3MPa, preferably 3.5-40MPa, as tested according to GB / T 1040.2; and the elongation at break is ≥200%, preferably 200%-550%.

[0039] In some embodiments of the present invention, the flexural modulus of the elastic composition is 40MPa-300MPa, as tested according to GB / T 9341.

[0040] In some embodiments of the present invention, the Shore hardness of the elastic composition is 70A-95A.

[0041] In some embodiments of the present invention, P3HB4HB and P4HB can be obtained by fermentation culture of recombinant bacteria.

[0042] In some embodiments of the present invention, P4HB can also be obtained by chemical synthesis.

[0043] In a second aspect, the present invention provides a method for preparing an elastic composition, comprising blending raw materials at a speed of 50-500 rpm for 10 s-5 min at room temperature; processing the raw materials using a twin-screw or single-screw extruder at a processing temperature of 40-145°C, preferably 50-130°C, and a screw speed of 80-150 rpm, preferably 80-120 rpm, to obtain the elastic composition as described above.

[0044] Specifically, a high-speed mixer can be used for blending.

[0045] In some specific embodiments, the preparation method of the elastic composition includes: weighing the raw materials of the elastic composition according to a set mass ratio, then mixing them in a high-speed mixer at a speed of 50-500 rpm for 10s-5min at room temperature, feeding the mixture into the feed port of a single-screw or twin-screw extruder, setting the processing temperature in the range of 40-130℃, adjusting the feed rate or capacity according to the actual production status, obtaining granules using a pelletizer, or winding them into wire using a wire rod mill, i.e., elastic composition granules or wire rods.

[0046] Thirdly, the present invention provides a 3D printing method, comprising placing the above-mentioned elastic composition into a 3D printer, setting the printer's printing temperature to 75°C, selecting a PEI substrate, setting the substrate temperature to -30°C to room temperature, and starting printing.

[0047] Fourthly, the present invention provides a molded article comprising the above-described elastic composition.

[0048] Optionally, based on the total mass of the molded body, the molded body comprises ≥50 wt% of the elastic composition.

[0049] Optionally, the molded body includes, but is not limited to, molded articles, extruded articles, drawn articles, fiber articles, 3D printed articles, foamed articles, sheet articles, plate articles, leather materials, leather products, soft toy materials, soft toy products, clothing products, medical products, packaging products, etc.

[0050] Optionally, the warpage of the 3D printed article is less than 10%.

[0051] Fifthly, the present invention provides the application of the above-described elastic composition.

[0052] The elastic composition of the present invention can be used to form the above-described molded body.

[0053] Specifically, the application of the elastic composition of the present invention involves feeding the above elastic composition into the feeding port of the corresponding processing equipment, setting the processing temperature within the range of 40-145°C, and adjusting the feeding amount or production capacity according to the actual production status to obtain the corresponding product.

[0054] As an example, the application of the elastic composition of the present invention includes:

[0055] Apparel industry: Elastic compositions are used in composite fabrics to make clothing such as outdoor jackets;

[0056] Medical industry: Due to their good compatibility and physical properties, elastic compositions can be used to manufacture medical devices and consumables such as artificial heart assist devices, artificial blood vessels, artificial skin, and infusion devices;

[0057] Packaging industry: Elastic compositions, when made into films, can be used in the packaging industry, such as food packaging films, pharmaceutical packaging films, etc.

[0058] Other applications: Elastic composite plastic films can be used to manufacture inflatable raw materials (such as lifeboats, airbags, etc.), vehicle seat cushions, fabrics, functional clothing (such as life jackets, raincoats, coats, snowsuits, thermal clothing, sportswear, etc.), liquid containers (such as oil bags, medicine bottles, softened water bags, etc.), radiation-proof glass partition raw materials, medical supplies (such as breathable medical supplies, surgical drapes, postoperative medical dressings, wound care, etc.), etc.

[0059] The elastic composition of this invention uses marine biodegradable material PHA to replace TPU in the production of products for flexible applications such as 3D printing consumables. This is more environmentally friendly and sustainable, and overcomes the shortcomings of TPU such as high processing temperature and harsh cooling and curing conditions. It lowers the application threshold of flexible consumables and further saves energy and reduces emissions. Detailed Implementation

[0060] The terms “comprising” or “including” in this invention are open-ended descriptions that include the specified ingredients or steps described, as well as other specified ingredients or steps that do not materially affect them.

[0061] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0062] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "specific implementation," or "some specific implementations," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0063] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this invention, not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0064] Where specific techniques or conditions are not specified in the examples, they shall be performed in accordance with the techniques or conditions described in the literature in this field, or in accordance with the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased through legitimate channels.

[0065] The full Chinese names of the English abbreviations appearing in this article are as follows.

[0066] PHA: Polyhydroxy fatty acid ester.

[0067] PHB: Poly-3-hydroxybutyrate.

[0068] P4HB: Poly-4-hydroxybutyrate.

[0069] P3HB4HB: Poly(3-hydroxybutyrate-co-4-hydroxybutyrate).

[0070] The particle size of the following lignin, coffee grounds, corn grits, and eggshell residue is 1-30 micrometers.

[0071] In the following examples and comparative examples, the tensile strength and elongation at break of the compositions were tested according to GB / T 1040.2 standard; the flexural modulus of elasticity of the compositions was tested according to GB / T 9341 standard; and the hardness of the compositions was tested using a Shore hardness tester.

[0072] Example 1

[0073] This embodiment provides a method for preparing an elastic composition. The specific method is as follows: Based on mass parts, 78 parts of P3HB4HB (weight-average molecular weight 650,000, PDI 2.8, 4HB molar content 33%), 20 parts of P4HB (weight-average molecular weight 110,000, PDI 1.7), 0.3 parts of nucleating agent (EBS, ethylene bis-stearamide), 0.5 parts of heat stabilizer (zinc stearate), 0 parts of antioxidant, 0.5 parts of reinforcing agent (nanocellulose), 3 parts of plasticizer (triacetin), and 0.5 parts of anti-hydrolysis agent (HyMax). 210), 25 parts filler (coffee grounds), are mixed in a high-speed mixer at 300 rpm for 30 seconds at room temperature. The mixture is then fed into the feed port of a screw extruder. The processing temperature is set within the range of 50-130℃, and the main machine speed is 80-120 rpm. The feed rate or production capacity is adjusted according to the actual production status. The mixture is then drawn and wound into wire using a wire rod mill to obtain the elastic composite wire.

[0074] The properties of the elastic composition were tested according to GB / T 1040.2 and GB / T 9341 standards. In this embodiment, the elastic composition obtained by the above preparation method exhibits a tensile strength of 6.2 MPa, an elongation at break of 385.7%, a flexural modulus of 74.0 MPa, and a hardness of 78A. The elastic composition in this embodiment demonstrates stable processing and low shrinkage.

[0075] The above-mentioned elastic composition is used to produce 3D printed products through 3D printing process. The specific 3D printing method is as follows: place the elastic composition into the 3D printer, set the printing temperature to 75℃, select the PEI base plate, and set the base plate temperature from -30℃ to room temperature. Start printing to obtain 3D printed products of the elastic composition with a warpage rate of less than 5%.

[0076] Examples 2-7

[0077] Following a similar method to Example 1 for preparing elastic compositions, elastic composition wires of Examples 2-7 were prepared using the corresponding component proportions in Table 1 below. The test performance of the corresponding elastic compositions is shown in Table 1 below, and the test standards used are the same as those in Example 1.

[0078] The molded body was prepared using the same 3D printing process as in Example 1.

[0079] The component ratios (parts by mass) and corresponding properties of Examples 1-7 are shown in Table 1.

[0080] Table 1. Composition ratios (parts by mass) and corresponding properties of the elastic compositions in each embodiment.

[0081] Comparative Examples 1-6

[0082] According to the formulations in Table 2, elastic compositions of Comparative Examples 1-6 were prepared using a method similar to that used in Example 1 for preparing elastic compositions, corresponding to the component proportions in Table 2. Their test performance and apparent product performance are given accordingly.

[0083] Table 2. Composition ratios (parts by mass) and corresponding properties of the comparative elastic compositions

[0084] Compared with Example 1, the proportion of P3HB4HB in Comparative Example 1 is too high; compared with Example 6, the proportion of P4HB in Comparative Example 2 is too high; Comparative Example 3 contains only P3HB4HB, and Comparative Example 4 contains only P4HB; compared with Example 1, the molar content of the repeating unit 4HB in P3HB4HB in Comparative Example 5 is less than 25%; compared with Example 1, Comparative Example 6 is a combination of PHB and P4HB, that is, P3HB4HB is replaced with PHB (weight average molecular weight is 890,000).

[0085] The results above show that Comparative Examples 1 and 3 have excessively low tensile strength, high shrinkage, and high warpage; Comparative Examples 2, 4, and 5 have excessively high flexural modulus and hardness; and Comparative Example 6 has excessively low elongation at break (poor elasticity) and excessively high flexural modulus and hardness. None of these results can simultaneously meet the requirements of low modulus, high elasticity, low shrinkage, and low warpage.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. Industrial applicability

[0087] This invention provides a highly elastic composition, its preparation method, and its applications. The elastic composition comprises P3HB4HB and P4HB, wherein the molar content of the repeating unit 4HB in P3HB4HB is ≥25%, and the mass ratio of P3HB4HB to P4HB is (4:1)-(1:4). The highly elastic composition of this invention has the advantages of being marine-degradable, having low modulus, high elasticity, low shrinkage, and low warpage. It can replace TPU in 3D printing, leather, soft toys, and other products, and has good economic value and application prospects.

Claims

1. An elastic composition, characterized in that, The elastic composition comprises P3HB4HB and P4HB, wherein the molar content of the repeating unit 4HB in P3HB4HB is ≥25%, and the mass ratio of P3HB4HB to P4HB is (4:1)-(1:4).

2. The elastic composition according to claim 1, characterized in that, The molar content of the repeating unit 4HB in P3HB4HB is 25%-75%, preferably 26%-40%; And / or, the mass ratio of P3HB4HB to P4HB is (3:1)-(1:3).

3. The elastic composition according to claim 1 or 2, characterized in that, The weight-average molecular weight of P3HB4HB is 200,000 to 2,000,000, preferably 350,000 to 700,000; more preferably PDI ≤ 3, or 2.5 to 2.

9. And / or, the weight-average molecular weight of the P4HB is 60,000-150,000, preferably 100,000-120,000; more preferably PDI≤2, or 16,000-17.

4. The elastic composition according to any one of claims 1-3, characterized in that, The sum of the masses of P3HB4HB and P4HB in the elastic composition accounts for ≥60% of the total mass, preferably 70%-98%.

5. The elastic composition according to any one of claims 1-4, characterized in that, The elastic composition further includes additives; the additives include one or more of nucleating agents, heat stabilizers, antioxidants, reinforcing agents, plasticizers, anti-hydrolysis agents, and fillers; Preferably, based on the mass of the elastic composition, the amount of nucleating agent added is 0.01-2%, the amount of heat stabilizer added is 0.1-2%, the amount of antioxidant added is 0.1-2%, the amount of reinforcing agent added is 0.1-5%, the amount of plasticizer added is 0.1-5%, the amount of anti-hydrolysis agent added is 0.1-2%, and the amount of filler added is 0.1%-30%. More preferably, the nucleating agent comprises one or more of the following: hexagonal crystal structure compounds (boron nitride, silicon nitride, titanium nitride, boron carbide, silicon carbide, titanium carbide, magnesium oxide, aluminum oxide), pyrimidines (uracil, thymine, cytosine), purines (adenine, guanine), dicarboxylic acid salicylhydrazide, melamine, sugar alcohols (pentaerythritol, isosorbide, sorbitol, mannitol, maltitol, erythritol), fatty acid amides (EBS, erucamide, oleamide, linoleamide, palmitamide), Shanxi Chemical Research Institute TMC300 and TMC 306, Jinan Chengju AD-506, AD-516, CE-208 and CE-301; And / or, the heat stabilizer includes one or more of 2-ethylhexanoate, stearate, and laurate; And / or, the antioxidants include one or more of the following: antioxidant 1010, antioxidant 1076, antioxidant BHT, antioxidant 1098, antioxidant 245, antioxidant 168, antioxidant DSTP, antioxidant 412S, antioxidant DLTP, antioxidant PEPQ, TNK-01, KSJ-936, DuPont 132F NC010, Rasig STABILIZER 7000, Rheinland Stabaxol P, and Doverphos S-9228. And / or, the reinforcing agent includes one or more of nanocellulose, nanomontmorillonite, nanocalcium carbonate, and nanosilica; And / or, the plasticizer comprises one or more of the following: isosorbide dioctanoate, acetylated dimethyl ricinoleate, epoxy tetrahydrophthalate, castor oil, polyethylene glycol series, polypropylene glycol series, tributyl acetylacetonate, tributyl acetylacetonate, epoxidized soybean oil, glycerin, triacetin, fatty acids (lactoic acid, tetradecanoic acid, hexadecanoic acid, octadecanoic acid, eicosanoic acid, docosanoic acid, icosahicosanoic acid, icosahicosanoic acid, icosahicosanoic acid, triacontanic acid), and fatty alcohols (dodecanol, tetradecanool, hexadecanool, octadecanool, eicosanool, docosanool, icosahicool, icosahicool, icosahicool, triacontanol, tridodecanool). And / or, the anti-hydrolysis agent includes one or more of carbodiimide, polycarbodiimide, HyMax 210, double bond anti-hydrolysis agent CHINOX P-500, DuPont 132F NC010, anti-hydrolysis stabilizer 3600, and KANEKA M732; And / or, the filler includes one or more of the following: talc, modified talc, silica, montmorillonite, starch, pregelatinized starch, barium sulfate, calcium carbonate, aluminum hydroxide, kaolin, bentonite, chitin, titanium dioxide, cellulose, lignin, coffee grounds, tea grounds, orange peel residue, seaweed powder, sugarcane bagasse, turmeric residue, rose residue, corn residue, eggshell residue, soybean residue, and rice residue.

6. The elastic composition according to claim 5, characterized in that, Based on the mass of the elastic composition, the amount of filler added is 4%-30%, optionally 8%-25%; Preferably, the filler is biomass waste residue, and more preferably one or more of the following: cellulose, lignin, coffee grounds, tea residue, orange peel residue, seaweed powder, sugarcane bagasse, turmeric residue, rose residue, corn residue, eggshell residue, soybean residue, and rice residue; Preferably, the particle size of the biomass waste residue is 1-30 micrometers.

7. The elastic composition according to any one of claims 1-6, characterized in that, According to the standard GB / T 1040.2, the tensile strength of the elastic composition is ≥3MPa, preferably 3.5-40MPa; the elongation at break is ≥200%, preferably 200%-550%. And / or, according to the standard GB / T 9341, the flexural modulus of the elastic composition is 40MPa-300MPa; And / or, the Shore hardness of the composition is 70A-95A.

8. A method for preparing an elastic composition, characterized in that, The method includes blending raw materials at a speed of 50-500 rpm for 10 s-5 min at room temperature; processing the raw materials using a twin-screw or single-screw extruder at a processing temperature of 40-145°C, preferably 50-130°C, and a screw speed of 80-150 rpm, preferably 80-120 rpm, to obtain the elastic composition as described in any one of claims 1-7.

9. A method for 3D printing, characterized in that, Place the elastic composition as described in any one of claims 1-7 into a 3D printer, set the printer temperature to 75°C, select the PEI base plate, set the base plate temperature to -30°C to room temperature, and start printing.

10. A molded body, characterized in that, Includes the elastic composition according to any one of claims 1-7; Optionally, based on the total mass of the molded body, the molded body comprises ≥50 wt% of the elastic composition; Optionally, the molded body includes, but is not limited to, molded articles, extruded articles, drawn articles, fiber articles, 3D printed articles, foamed articles, sheet articles, plate articles, leather materials, leather products, soft toy materials, soft toy products, clothing products, medical products, and packaging products; Optionally, the warpage of the 3D printed article is less than 10%.

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