Biodegradable polyester composition as well as preparation method and application thereof

Abstract

The invention discloses a biodegradable polyester composition as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials. The biodegradable polyester composition provided by the invention is prepared from the following components in parts by mass: 38 to 72 parts of biodegradable polyester composition, 18 to 47 parts of PLA (Polylactic Acid), 0.8 to 16 parts of filler, 0.01 to 1 part of slipping agent and 0.01 to 1 part of nucleating agent, the biodegradable polyester composition comprises PBAT and PBS, and the mass ratio of the PBS to the PBAT is greater than or equal to 4; the slipping agent is prepared from at least one of erucyl amide, oleamide and ethylene bistearic acid amide; the nucleating agent comprises at least one of an aromatic sulfonate nucleating agent and a hydrazide nucleating agent. The biodegradable polyester composition provided by the invention has excellent dimensional stability, meanwhile, a sprue breaking phenomenon cannot occur in a processing process, and the forming time is short.

Description

Technical Field

[0001] This invention belongs to the field of polymer materials technology, and particularly relates to a biodegradable polyester composition, its preparation method and application. Background Technology

[0002] Biodegradable materials have the characteristic of completely decomposing into harmless substances such as water and carbon dioxide under composting conditions, which is of great significance for environmental protection, resource conservation, sustainable development and human health.

[0003] However, biodegradable resins such as PLA and PBAT generally exhibit slow crystallization rates and low product strength during injection molding. This leads to issues like gate breakage and demolding difficulties during conventional injection molding processes on machines without hot runners or cooling systems, resulting in extremely low production efficiency. Furthermore, biodegradable materials like PLA have low heat service temperatures; when the temperature exceeds their heat distortion temperature, the products are prone to significant deformation, leading to poor dimensional stability. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a biodegradable polyester composition with excellent dimensional stability, no gate breakage during processing, and short molding time, as well as its preparation method and application.

[0005] To achieve the above objectives, in a first aspect, the present invention provides a biodegradable polyester composition comprising the following components in parts by weight: 38-72 parts of biodegradable polyester composition, 18-47 parts of PLA, 0.8-16 parts of filler, 0.01-1 part of slip agent, and 0.01-1 part of nucleating agent; The biodegradable polyester composition comprises PBAT and PBS, wherein the mass ratio of PBS to PBAT is ≥4. The slip agent includes at least one of erucamide, oleamide, and ethylene bis-stearamide; The nucleating agent includes at least one of aromatic sulfonate nucleating agents and acylhydrazine nucleating agents.

[0006] The biodegradable polyester composition provided by this invention, by selecting appropriate mass fractions of components and combining them with each other, can achieve good dimensional stability of the product, and will not cause gate breakage during processing. It also has a short molding time and can effectively improve processing efficiency.

[0007] Specifically, firstly, the nucleating agent selected in this invention can effectively increase the crystallization temperature and crystallization rate of PBS. Simultaneously, the addition of compound fillers further refines the spherulite size and improves the regularity of spherulite arrangement, thereby improving the mechanical properties of the material and reducing the occurrence of gate breakage during subsequent processing. It also enhances the dimensional stability of the product and reduces molding time. Secondly, the addition of a specific type and within a specific mass fraction range of slip agent can partially migrate to the material surface during processing, forming a low surface energy lubricating film. This reduces adhesion and mechanical interlocking with the mold, thus preventing gate breakage during processing and effectively reducing molding time. Thirdly, PBAT has relatively superior toughness, PBS has relatively better processing and molding efficiency, and PLA has relatively high strength. This invention selects PBAT, PBS, and PLA within a specific mass fraction range for combined use. The three have a good compounding effect, effectively achieving excellent overall product performance.

[0008] For example, the biodegradable polyester composition can be any point value or any two-point range value between 38 and 72 parts, such as 40-70 parts, or 38 parts, 40 parts, 42 parts, 44 parts, 46 parts, 48 ​​parts, 50 parts, 52 parts, 55 parts, 58 parts, 60 parts, 62 parts, 65 parts, 66 parts, 68 parts, 70 parts, 72 parts, etc.; the PLA can be any point value or any two-point range value between 18 and 47 parts, such as 20-45 parts, or 18 parts, 20 parts, 22 parts, 24 parts, 26 parts, 28 parts, 30 parts, 32 parts, 34 parts, 36 parts, 38 parts, 40 parts, 42 parts, 44 parts, 46 parts, 47 parts, etc.; the filler can be any point value or any two-point range value between 0.8 and 16 parts, compared to... The amount can be 1-15 parts, or 0.8 parts, 1 part, 2 parts, 4 parts, 6 parts, 8 parts, 10 parts, 12 parts, 14 parts, 16 parts, etc.; the slip agent can be any point value or any two-point range value between 0.01 and 1 part, for example, 0.02-0.8 parts, or 0.01 parts, 0.02 parts, 0.04 parts, 0.06 parts, 0.08 parts, 0.1 parts, etc. The amounts can be 0.2 parts, 0.4 parts, 0.6 parts, 0.8 parts, 1 part, etc.; the nucleating agent can be any point value or any two-point range value between 0.01 and 1 part, for example, it can be 0.02-0.8 parts, or it can be 0.01 parts, 0.02 parts, 0.04 parts, 0.06 parts, 0.08 parts, 0.1 parts, 0.2 parts, 0.4 parts, 0.6 parts, 0.8 parts, 1 part, etc.

[0009] Preferably, the biodegradable polyester composition comprises ≥35% by mass.

[0010] More preferably, the biodegradable polyester composition comprises 45-68% by mass.

[0011] As a preferred embodiment of the biodegradable polyester composition of the present invention, the biodegradable polyester composition comprises the following components in parts by weight: 55-65 parts of biodegradable polyester composition, 25-30 parts of PLA, 8-14 parts of filler, 0.01-1 parts of slip agent, and 0.01-1 parts of nucleating agent.

[0012] The present invention has found that the mass fraction of a component in a biodegradable polyester composition affects the overall performance of the component. When the mass fraction of the component is further selected within the above-mentioned range, the overall performance of the resulting biodegradable polyester composition is even better.

[0013] In a preferred embodiment of the biodegradable polyester composition of the present invention, the mass ratio of PBS to PBAT is 4-11.

[0014] For example, the mass ratio of PBS to PBAT can be any point value or any two points between 4 and 11, such as 4, 5, 6, 7, 8, 9, 10, 11, etc.

[0015] This invention has found that the mass ratio of PBAT to PBS affects the compatibility between components, as well as the effect of slip agents and nucleating agents on the resin system. When the mass ratio of PBAT to PBS is further selected to be 4-11 based on a mass ratio of ≥4, the resulting product has higher dimensional stability, no gate breakage occurs during processing, and the molding time of the resulting product is shorter in subsequent processing.

[0016] As a preferred embodiment of the biodegradable polyester composition of the present invention, the PBAT has a melt index of 20-40 g / 10 min at 190°C / 2.16 kg.

[0017] It should be noted that the melt flow index of the PBAT at 190℃ / 2.16kg was obtained with reference to ISO-1133-1:2011.

[0018] For example, the melt flow index of the PBAT at 190℃ / 2.16kg can be any point value or any two-point range value between 20-40g / 10min, such as 22-38g / 10min, 22-30g / 10min, 30-38g / 10min, etc., or 20g / 10min, 22g / 10min, 25g / 10min, 28g / 10min, 30g / 10min, 32g / 10min, 35g / 10min, 38g / 10min, 40g / 10min, etc.

[0019] Preferably, the melt flow index of the PBAT at 190℃ / 2.16kg is 28-33g / 10min.

[0020] This invention has found that the melt index of PBAT affects its compatibility with PLA and PBS, and also affects the role of nucleating agents and slip agents. When the melt index of PBAT is further selected within the above range, the overall performance of the obtained product is better.

[0021] It should be noted that in the PBAT, the molar percentage of adipic acid is 40-60% of the total molar content of acid.

[0022] In a preferred embodiment of the biodegradable polyester composition of the present invention, the polydispersity index of the PBAT is 1.7-2.7.

[0023] It should be noted that the polydispersity index (PDI) of PBAT was determined by gel permeation chromatography (GPC) to obtain the number-average molecular weight and weight-average molecular weight, which were then calculated using the formula: polydispersity index = number-average molecular weight / weight-average molecular weight. Specifically, the GPC test was performed using a chromatographic system at 40°C, employing a set of three tandem columns (particle diameter of 5 μm and porosities of 500 Å, 1000 Å, and 10000 Å, respectively) and a refractive index detector, with chloroform as the eluent (elution flow rate of 1 mL / min) and polystyrene as the reference standard. The instrument model was Waters 1515GPC. The sample preparation method was as follows: PBAT was directly dissolved in chromatographic grade THF to prepare a 1 mg / mL solution, which was then tested to obtain the number-average molecular weight and weight-average molecular weight of PBAT.

[0024] For example, the polydispersity index of the polybutylene terephthalate can be any point value or any two-point range value between 1.7 and 2.7, such as 1.8-2.6, 1.8-2.2, 2.2-2.6, or 1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, etc.

[0025] Preferably, the polydispersity index of the PBAT is 2.0-2.4.

[0026] This study found that the polydispersity coefficient of PBAT reflects the uniformity of molecular chain length to a certain extent. Its uniformity affects its compatibility with PLA and PBS, as well as its migration. When the polydispersity coefficient of PBAT is further selected within the above range, the resulting product has better dimensional stability, does not have gate breakage during processing, and has a shorter molding time during processing.

[0027] It should be noted that the PBAT provided by this invention can be prepared by a self-made method or purchased from conventional commercial sources.

[0028] For example, the preparation method of PBAT includes the following steps: mixing adipic acid, terephthalic acid, 1,4-butanediol and a catalyst, and reacting them at 230-270°C and 150-350 Pa for 2.0-4.0 h.

[0029] Preferably, the catalyst comprises tetrabutyl titanate.

[0030] Preferably, the amount of catalyst added is 0.01-0.06% based on the mass of 1,4-butanediol.

[0031] In a preferred embodiment of the biodegradable polyester composition of the present invention, the crystallinity of the PBS is 30-50%.

[0032] It should be noted that the crystallinity of the PBS was tested using DSC. Specifically, the DSC test consisted of two cycles of heating and cooling, with the heating rate from 40°C to 200°C at 10 K / min and the cooling rate from 200°C to 40°C at 10 K / min.

[0033] For example, the crystallinity of the PBS can be any point value or any two-point range value between 30% and 50%, such as 32.2-48.6%, 32.2-40.1%, 40.1-48.6%, etc., or 30%, 35%, 40%, 45%, 50%, etc.

[0034] Preferably, the crystallinity of the PBS is 38-42%.

[0035] This invention has found that the crystallinity of PBS affects its own crystallization properties, as well as the overall crystallization properties of the composition. In addition, the crystallinity of PBS also affects its interaction with other components. When the crystallinity of PBS is further selected within the above-mentioned range, the overall performance of the obtained product is better.

[0036] It should be noted that the PBS provided by this invention can be prepared by a self-made method or purchased from commercially available sources.

[0037] For example, the preparation method of the PBS includes the following steps: mixing 1,4-succinic acid with 1,4-butanediol and a catalyst, and reacting them at 215-250°C and 150-400 Pa for 2.0-4.0.

[0038] Preferably, the catalyst comprises tetrabutyl titanate.

[0039] Preferably, the amount of catalyst added is 0.01-0.06% based on the mass of 1,4-succinic acid.

[0040] Preferably, the molar ratio of 1,4-succinic acid to 1,4-butanediol is 1:(1.1-1.4).

[0041] In a preferred embodiment of the biodegradable polyester composition of the present invention, the PLA has a molar content of 0.1-1.5% of the dextrorotatory D monomer.

[0042] It should be noted that the molar content of the dextrorotatory D monomer in PLA was obtained by gas chromatography. Specifically, the gas chromatography test was conducted using an Agilent 8860 gas chromatograph with a CP7502 column, an FID detector temperature of 200°C, a hydrogen flow rate of 45 mL / min, an air flow rate of 450 mL / min, and a split ratio of 5:1.

[0043] For example, the molar content of the dextrorotatory D monomer in the PLA can be any point value or any two points between 0.1% and 1.5%, such as 0.3-1.4%, 0.3-0.5%, 0.5-1.4%, or 0.1%, 0.2%, 0.4%, 0.6%, 0.8%, 1%, 1.2%, 1.4%, 1.5%, etc.

[0044] Preferably, the molar content of the PLA with dextrorotatory D monomer is 0.4-0.6%.

[0045] It should be noted that the molar content of the L-monomer in the PLA is 98.5-99.9%, and preferably, the molar content of the L-monomer in the PLA is 99.4-99.6%.

[0046] This study found that when the molar content of the dextrorotatory D monomer in PLA is further selected within the above range, it can better work together with other components, resulting in better dimensional stability of the product, no gate breakage during processing, and shorter molding time.

[0047] It should be noted that the PLA provided by this invention can be prepared by a self-made method or purchased from conventional commercial sources.

[0048] For example, the preparation method of PLA includes the following steps: L,L-lactide is added to a reaction vessel and stannous octoate is added to carry out ring-opening polymerization: first, the reaction is carried out at a reaction temperature of 130-170℃ and a reaction pressure of 3500-6500Pa for 1.5-3.0h, and then the reaction is carried out at a reaction temperature of 165-200℃ and a reaction pressure of 8000-12000Pa for 1.8-5.0h; after the reaction is completed, the product is granulated underwater, crystallized, and dried.

[0049] Preferably, the amount of stannous octoate added is 0.1-2000 ppm based on the mass of L,L-lactide added.

[0050] In a preferred embodiment of the biodegradable polyester composition of the present invention, the filler comprises talc powder with a D50 ≤ 12 μm.

[0051] Preferably, the talc powder has a D50 ≤ 6 μm.

[0052] More preferably, the D50 of the talc is 3.0-6 μm.

[0053] The present invention has found that when talc is further selected as the filler and the D50 of the talc is within the above range, the talc can better exert its role in moderately stiffening the material and promoting heterogeneous nucleation, thereby improving the overall performance of the prepared product to a certain extent.

[0054] It should be noted that the particle size (D50) of talc powder was obtained by laser particle size analyzer. The specific testing method is determined according to GB / T 19077.1-2008 "Particle Size Analysis by Laser Diffraction".

[0055] For example, the aromatic sulfonate nucleating agents include sodium p-toluenesulfonate, biphenyl sulfonate, sodium 2,6-naphthalenedisulfonate, etc.; the acylhydrazine nucleating agents include dicarboxylic acid salicylic hydrazine, sebacic acid diphenyl dihydrazine, adipic acid diphenyl dihydrazine (TMC-306), etc.

[0056] In a second aspect of the present invention, the present invention provides a method for preparing the biodegradable polyester composition, the method comprising the following steps: weighing the dried raw materials and adding them into a twin-screw extruder for mixing, extrusion, and granulation to obtain the biodegradable polyester composition.

[0057] In a preferred embodiment of the preparation method of the present invention, during the extrusion process, the temperature of the solid conveying zone is 70-90℃, the temperature of the melting zone is 130-200℃, the temperature of the melt conveying zone is 170-190℃, and the screw speed is 350-450 r / min.

[0058] In a third aspect, the present invention provides the use of the biodegradable polyester composition in the preparation of injection-molded products.

[0059] For example, the injection-molded products include security products (fire protection covers), daily chemical products (electric toothbrush replacement heads), agricultural auxiliary equipment (agricultural clips), etc.

[0060] Compared with the prior art, the beneficial effects of the present invention are as follows: The biodegradable polyester composition provided by this invention, by selecting appropriate mass fractions of components and combining them with each other, can achieve good dimensional stability of the product, and will not cause gate breakage during processing. It also has a short molding time and can effectively improve processing efficiency. Detailed Implementation

[0061] To better illustrate the purpose, technical solution, and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0062] Unless otherwise specified, the reagents, methods and equipment used in this invention are all conventional reagents, methods and equipment in the field; and unless otherwise specified, the raw materials used in parallel experiments are from the same batch.

[0063] PBAT-1: Melt index of 30 g / 10 min at 190℃ / 2.16 kg, polydispersity index of 2.2, self-made; PBAT-2: Melt index of 22 g / 10 min at 190℃ / 2.16 kg, polydispersity index of 1.8, self-made; PBAT-3: Melt index of 38 g / 10 min at 190℃ / 2.16 kg, polydispersity index of 2.6, self-made; The preparation method of PBAT-1 includes the following steps: Adipic acid, terephthalic acid, 1,4-butanediol, and tetrabutyl titanate were added to a reaction vessel for reaction; the molar ratio of adipic acid, terephthalic acid, and 1,4-butanediol was 1:1:2.8; the mass ratio of 1,4-butanediol to tetrabutyl titanate was 3000:1; the reaction temperature was 250℃, the reaction pressure was 200Pa, and the reaction time was 3.0h, yielding PBAT-1; PBAT-2 and PBAT-3 are PBAT preparations based on PBAT-1, with adjustments to the reaction temperature and reaction time to achieve corresponding parameters. Specifically, the reaction temperature of PBAT-2 is 235℃ and the reaction time is 3.5h; the reaction temperature of PBAT-3 is 265℃ and the reaction time is 2.5h.

[0064] PBS-1: Crystallinity 40.1%, A200 SF NC801, Zhuhai Kingfa Biomaterials Co., Ltd.; PBS-2: Crystallinity 32.2%, self-made; PBS-3: Crystallinity 48.6%, self-made; The preparation method of PBS-2 includes the following steps: 1,4-Succinic acid, 1,4-butanediol, and tetrabutyl titanate were added to a reaction vessel; the molar ratio of 1,4-succinic acid to 1,4-butanediol was 1:1.2; the mass ratio of 1,4-succinic acid to tetrabutyl titanate was 3000:1; the reaction temperature was 230℃, the reaction pressure was 200Pa, and the reaction time was 2.5h, yielding PBS-2. Based on the biodegradable copolyester PBS-2, the crystallinity of the biodegradable copolyester can be changed by adjusting the molar ratio of 1,4-succinic acid to 1,4-butanediol, the mass ratio of 1,4-succinic acid to tetrabutyl titanate, and the reaction time, thereby preparing the biodegradable copolymer PBS-3. Specifically, in the preparation of PBS-3, the molar ratio of 1,4-succinic acid to 1,4-butanediol is 1:1.3, the mass ratio of 1,4-succinic acid to tetrabutyl titanate is 2500:1, the reaction temperature is 220℃, and the reaction time is 3.0h.

[0065] PLA-1: The molar content of the dextrorotatory D monomer was determined by gas chromatography to be 0.5%, PLA L105, TotalEnergiesCorbion; PLA-2: The molar content of the dextrorotatory D monomer was determined by gas chromatography to be 1.4%, PLA 3251D, Natureworks; PLA-3: The molar content of the dextrorotatory D monomer was determined to be 0.3% by gas chromatography; it was prepared in-house. The preparation method of PLA-3 includes the following steps: L,L-lactide (L content ≥ 99.8%) was added to a reactor along with 300 ppm of stannous octoate for ring-opening polymerization: the reaction was first carried out at a temperature of 150℃ and a pressure of 5000 Pa for 2 hours, and then at a temperature of 180℃ and a pressure of 10000 Pa for 4 hours. After the reaction was completed, the product was granulated underwater, crystallized, and dried to obtain PLA-3.

[0066] Filler 1: Talc powder, D50 is 5.2μm, Tianyuan Chemical; Filler 2: Talc powder, D50 is 10.5μm, Guangxi Longsheng Huamei Talc Development Co., Ltd.; Filler 3: Talc, D50 1.2μm, Liaoning Aihai; Filler 4: Calcium carbonate, D50 of 5.5μm, Omega; Slip agent 1: Erucamide, commercially available; Slip agent 2: Ethylene bis-stearamide, commercially available; Slip agent 3: Fischer-Tropsch wax, YT-90, commercially available; Nucleating agent 1: Aryl sulfonate nucleating agent, potassium dimethyl 5-sulfoisophthalate (LAK-301), Takemoto Oils & Fats, Japan; Nucleating agent 2: Acylhydrazide nucleating agent, dibenzoylhydrazide adipic acid (TMC-306), Shanxi Chemical Research Institute; Nucleating agent 3: Zinc phosphonate nucleating agent, zinc phenylphosphonate (TMC-200), Shanxi Chemical Research Institute.

[0067] Examples 1-16 and Comparative Examples 1-5 The present invention provides a biodegradable polyester composition in the embodiments and comparative examples, wherein the component content (parts by weight) of the biodegradable polyester composition is shown in Tables 1-2; Table 1 Table 2 The preparation method of the biodegradable polyester composition provided in Example 1 is as follows: After drying, the raw materials are weighed and added to a twin-screw extruder for mixing, extrusion, and granulation to obtain a biodegradable polyester composition. During the extrusion process, the temperature of the solid conveying zone is 80℃, the temperature of the melting zone is 140℃, 180℃, and 190℃, the temperature of the melt conveying zone is 180℃, and the screw speed is 400r / min.

[0068] The preparation methods of the biodegradable polyester compositions provided in Examples 2-16 and Comparative Examples 1-5 are consistent with those in Example 1, except that the relevant components are not required.

[0069] Example of effect The performance of the biodegradable polyester compositions prepared in the examples and comparative examples of this invention is verified by the following aspects: 1. Dimensional stability test: The composition was injection molded into a 100*100*1mm square plate, baked in a 70℃ oven for 48 hours, and then left to stand at 25℃ for 24 hours. The deformation in the thickness direction (reference value: 1mm) of the square plate was then examined using a two-dimensional measuring instrument. Specifically, the maximum value of the deformation in the thickness direction of the square plate was measured using a two-dimensional measuring instrument and recorded as x. The deformation amount was then calculated as (x-1) / 1*100%. 2. Gate breakage test: Take 5kg of sample material, fix the injection molding machine and the national standard mechanical parameters for injection molding process, observe and record the frequency of gate breakage; 3. Injection cycle: The total time required to complete one injection molding process when mass production is carried out at the same terminal; if a gate break occurs, the entire production needs to be stopped, so the corresponding injection cycle cannot be calculated, and is represented by " / ". The results of the above tests are shown in Table 3. Table 3 As can be seen from Table 3, when the technical solution of the present invention is adopted, the obtained product has good dimensional stability, no gate breakage occurs during processing, and the injection molding cycle is short; specifically, the obtained product has a square plate shape change of less than 9.8% in the dimensional stability test, no gate breakage occurs, and the injection molding cycle is less than 21.2s. As can be seen from Examples 1, 4-5 and Comparative Example 3, the mass ratio of PBS to PBAT affects the overall performance of the product. When the mass ratio of PBS to PBAT in Comparative Example 3 is not within the range given in this invention, the product will exhibit gate breakage. As can be seen from Examples 1 and Comparative Examples 4-5, when only PBS is added in Comparative Example 4, the dimensional stability of the product decreases significantly, and the injection molding cycle also increases to a certain extent. As can be seen from Examples 1, 15, and Comparative Example 1, the type of slip agent affects the overall performance of the product. When the slip agent used in Comparative Example 1 is not provided by the present invention, the dimensional stability of the obtained product decreases significantly, and the injection molding cycle also shows a significant increasing trend. As can be seen from Examples 1, 16, and Comparative Example 2, the type of nucleating agent also affects the overall performance of the product. When the nucleating agent used in Comparative Example 2 is not provided by the present invention, the dimensional stability of the obtained product decreases significantly, and the injection molding cycle also shows a significant increasing trend. As can be seen from Examples 1 and 6-7, Examples 1 and 8-9, and Examples 1 and 10-11, the parameters of PBAT, PBS, and PLA also have a certain impact on the performance of the product; as can be seen from Examples 1 and 12-14, the type of filler also has a certain impact on the performance of the product.

[0070] Finally, it should be noted that the above embodiments are used to illustrate the technical solutions of the present invention and not to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A biodegradable polyester composition, characterized in that, The biodegradable polyester composition comprises the following components in parts by weight: 38-72 parts of biodegradable polyester composition, 18-47 parts of PLA, 0.8-16 parts of filler, 0.01-1 part of slip agent, and 0.01-1 part of nucleating agent; The biodegradable polyester composition comprises PBAT and PBS, wherein the mass ratio of PBS to PBAT is ≥4. The slip agent includes at least one of erucamide, oleamide, and ethylene bis-stearamide; The nucleating agent includes at least one of aromatic sulfonate nucleating agents and acylhydrazine nucleating agents.

2. The biodegradable polyester composition according to claim 1, characterized in that, The biodegradable polyester composition comprises the following components in parts by weight: 55-65 parts biodegradable polyester composition, 25-30 parts PLA, 8-14 parts filler, 0.01-1 part slip agent, 0.01-1 part nucleating agent.

3. The biodegradable polyester composition according to claim 1, characterized in that, The mass ratio of PBS to PBAT is 4-11.

4. The biodegradable polyester composition according to claim 1, characterized in that, The melt flow index of the PBAT at 190℃ / 2.16kg is 20-40g / 10min; And / or, the polydispersity factor of the PBAT is 1.7-2.

7.

5. The biodegradable polyester composition according to claim 1, characterized in that, The crystallinity of the PBS is 30-50%.

6. The biodegradable polyester composition according to claim 1, characterized in that, The PLA has a dextrorotatory D monomer molar content of 0.1-1.5%.

7. The biodegradable polyester composition according to claim 1, characterized in that, The filler includes talc powder, wherein the talc powder has a D50 ≤ 12 μm.

8. The method for preparing the biodegradable polyester composition according to any one of claims 1-7, characterized in that, The preparation method includes the following steps: After drying, the raw materials are weighed and added to a twin-screw extruder for mixing, extrusion, and granulation to obtain a biodegradable polyester composition.

9. A component, characterized in that, The component is prepared using the biodegradable polyester composition as described in any one of claims 1-7.

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