Bio-ABS / Bio-PE alloy material and preparation method thereof

Abstract

The invention discloses a Bio-ABS (Acrylonitrile Butadiene Styrene) / Bio-PE (Polyethylene) alloy material and a preparation method thereof, and belongs to the technical field of polymer alloy materials. The alloy material comprises the following components in percentage by weight: 40%-65% of Bio-ABS (Acrylonitrile Butadiene Styrene) resin, 30%-55% of Bio-PE (Polyethylene) resin and 3%-15% of a polyethylene grafted polystyrene compatilizer. A PE main chain of the polyethylene grafted polystyrene compatilizer is activated and modified to form active free radical sites, and reaction sites are provided for grafting of a PS branch chain; the PS branch chain is formed by in-situ graft polymerization of a styrene monomer on an activated PE main chain, comprises a repeated structural unit which is the same as that of a styrene chain segment in the Bio-ABS, and can be stably combined with the Bio-ABS according to the principle of'similar phase fusion '. The polyethylene grafted polystyrene compatilizer introduced in the invention successfully solves the problem of compatibility in the alloying process of high-proportion bio-based polyethylene and Bio-ABS, and the obtained material has the characteristics of high bio-based content, low carbon and environmental protection and excellent mechanical properties, and has wide industrial application prospects.

Description

Technical Field

[0001] This invention relates to the field of polymer alloy materials technology, and in particular to a Bio-ABS / Bio-PE alloy material and its preparation method. Background Technology

[0002] With the world's urgent pursuit of sustainable development, the development of bio-based polymer materials based on renewable resources has become an important direction for the plastics industry.

[0003] Bio-based polyethylene (Bio-PE), whose monomer ethylene is derived from the fermentation of biomass such as sugarcane and corn, has the same chemical structure and properties as traditional petroleum-based PE, and its production process significantly reduces its carbon footprint, making it an ideal alternative to petrochemical PE. Acrylonitrile-butadiene-styrene copolymer (Bio-ABS) is a widely used thermoplastic engineering plastic, known for its excellent impact resistance, rigidity, and processing flowability. However, Bio-ABS itself is entirely dependent on petroleum-based raw materials. Blending Bio-PE and Bio-ABS to prepare bio-based Bio-ABS alloys is an effective way to quickly endow Bio-ABS materials with green properties and reduce their environmental impact throughout their entire life cycle.

[0004] However, achieving this goal faces severe technical challenges: First, Bio-ABS and Bio-PE are typical thermodynamically incompatible systems. Their polarity and solubility parameters differ significantly, and direct blending leads to extremely poor interfacial adhesion, resulting in macroscopic phase separation and severely impairing the material's mechanical properties, especially impact strength. Second, to truly achieve significant environmental benefits, a high proportion (e.g., ≥30wt%) of Bio-PE needs to be introduced, but this will further exacerbate the phase separation problem, causing a sharp decrease in the alloy's toughness and making it difficult to meet the requirements of most applications.

[0005] Currently, common methods for improving the compatibility of Bio-PE and Bio-ABS include using non-reactive compatibilizers (such as SEBS) or introducing reactive functional groups (such as maleic anhydride grafts). However, existing non-reactive compatibilizers have limited compatibilizing effects in highly incompatible systems, making it difficult to support the introduction of high proportions of Bio-PE. While existing highly polar reactive compatibilizers (such as PE-g-MAH) can improve the interface by reacting with the SAN phase in Bio-ABS, they often do not sufficiently improve the toughness of the alloy and may impair processing flowability. Therefore, developing a novel compatibilization system that can efficiently compatibilize high proportions of Bio-PE and Bio-ABS, and enable the alloy to exhibit excellent impact resistance while maintaining high rigidity and good processability, has become a pressing technical challenge in this field.

[0006] Based on this, the present invention proposes a Bio-ABS / Bio-PE alloy material and its preparation method to solve the problems mentioned above. Summary of the Invention

[0007] The purpose of this invention is to provide a Bio-ABS / Bio-PE alloy material and its preparation method, so as to achieve micro-phase regulation and interface strengthening of high proportion of Bio-PE and Bio-ABS, and ensure excellent comprehensive mechanical properties of the material while significantly reducing the carbon footprint of the material.

[0008] To address the aforementioned technical problems, this invention provides a Bio-ABS / Bio-PE alloy material, comprising the following components by weight percentage: 40%~65% Bio-ABS resin; 30%~55% Bio-PE resin; and 3%~15% polyethylene-grafted polystyrene compatibilizer. The PE backbone of the polyethylene-grafted polystyrene compatibilizer is activated and modified to form active free radical sites on the PE molecular chain, and its PS branch chain is formed by in-situ grafting polymerization of styrene monomer on the activated PE backbone.

[0009] Furthermore, the purity of the polyethylene-grafted polystyrene compatibilizer is ≥99.5%.

[0010] Furthermore, the grafting rate of the PE backbone and its PS branch chain in the polyethylene-grafted polystyrene compatibilizer is adjustable within the range of 5% to 20%.

[0011] Furthermore, the Bio-PE resin is bio-based high-density polyethylene or bio-based linear low-density polyethylene, and its bio-based carbon content is ≥90%.

[0012] Furthermore, the content of polybutadiene in the Bio-ABS resin is 10%~25%, and the content of acrylonitrile is 20%~30%.

[0013] Furthermore, the Bio-ABS / Bio-PE alloy material also includes 0% to 5% by weight of auxiliary agents, which are one or more of antioxidants, lubricants, and stabilizers.

[0014] The present invention also provides a method for preparing the above-mentioned alloy material, comprising the following steps: S1. Preparation of polyethylene-grafted polystyrene compatibilizer: Active free radical sites are formed on the PE main chain molecular chain through activation modification. Then, under the protection of inert gas, the activated PE main chain is grafted with styrene monomer in situ. After post-treatment, the polyethylene-grafted polystyrene compatibilizer is obtained. S2. Raw material premixing: Bio-ABS resin, Bio-PE resin, and the prepared polyethylene grafted polystyrene compatibilizer or auxiliary additives are fully premixed in a high-speed mixer according to the proportion to obtain a premix. S3. Melt blending and granulation: The premixed material is fed into a twin-screw extruder and melt blended under set process conditions. After extrusion, it is sequentially cooled by water, drawn and granulated to obtain alloy particles.

[0015] Furthermore, in step S1, the post-processing step includes sequential washing, drying, and granulation processes.

[0016] Furthermore, in step S1, during the in-situ graft polymerization process, the amount of styrene monomer, the reaction temperature, and the reaction time are controlled within a reasonable range, wherein the reaction temperature ranges from 80 to 120°C, and the reaction time ranges from 2 to 4 hours.

[0017] Furthermore, in step S3, the processing temperature range of the twin-screw extruder is 180℃~240℃, the screw speed is 200~500rpm, and the material residence time is controlled within 1~3min.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects: The Bio-ABS / Bio-PE alloy material provided by this invention introduces 30%~55% Bio-PE resin, significantly replacing petroleum-based carbon sources. This significantly increases the bio-based carbon content of the alloy material and reduces its carbon footprint throughout its life cycle, meeting the requirements of green and sustainable development. Simultaneously, thanks to a polyethylene-grafted polystyrene compatibilizer with a specific structure, its PE backbone exhibits excellent compatibility with Bio-PE, allowing for uniform dispersion within the Bio-PE phase. Its PS branches are formed by in-situ grafting and polymerization of styrene monomers onto the activated PE backbone, containing repeating structural units identical to the styrene segments in Bio-ABS. This allows for stable interfacial interaction with Bio-ABS, effectively improving phase dispersion, reducing phase size, and strengthening interfacial adhesion. As a result, while maintaining the original rigidity and strength of Bio-ABS, the impact strength of the alloy is greatly preserved or even enhanced, overcoming the embrittlement defects typically caused by high-proportion incompatible blends.

[0019] (2) The preparation method of Bio-ABS / Bio-PE alloy material provided by the present invention includes an in-situ preparation step of compatibilizer, the process is continuous, and the whole process can be achieved by melt blending. There is no need to perform complex pretreatment on the matrix resin. The process is simple and easy to realize industrial production. Attached Figure Description

[0020] Figure 1 This is a flowchart of the preparation method of Bio-ABS / Bio-PE alloy material in Embodiment 2 of the present invention; Figure 2 The infrared spectrum of the alloy material produced in Example 1 of this invention is shown. Detailed Implementation

[0021] The Bio-ABS / Bio-PE alloy material and its preparation method of the present invention will be described in more detail below with reference to the schematic diagrams, which illustrate preferred embodiments of the present invention. It should be understood that those skilled in the art can modify the present invention described herein while still achieving the advantageous effects of the present invention. Therefore, the following description should be understood as being of general knowledge to those skilled in the art and is not intended to limit the present invention.

[0022] Furthermore, based on the teachings of this specification, those skilled in the art can form new technical solutions through cross-combination of different implementation methods without creating technical contradictions. Such variations should all be considered to fall within the protection scope of this patent.

[0023] The invention is described more specifically by way of example in the following paragraphs with reference to the accompanying drawings. The advantages and features of the invention will become clearer from the following description. It should be noted that the drawings are in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the invention.

[0024] Example 1 This embodiment proposes a Bio-ABS / Bio-PE alloy material, which comprises the following components by weight percentage: Bio-ABS resin: 40%~65%; Bio-PE resin: 30%~55%; Polyethylene-grafted polystyrene compatibilizer: 3%~15%; Additives and excipients: 0%~5%.

[0025] The core structure of the polyethylene-grafted polystyrene compatibilizer is "PE main chain + PS branch chain": the PE main chain forms active free radical sites through activation modification (such as plasma treatment or peroxide initiation), providing reaction sites for the grafting of PS branch chains; the PS branch chain is formed by in-situ grafting and polymerization of styrene monomers onto the activated PE main chain, containing the same repeating structural units (-CH2-CH(C6H5)-) as the styrene segments in Bio-ABS, and can form a stable bond with Bio-ABS through the principle of "like dissolves like".

[0026] In this embodiment, the grafting rate of the polyethylene-grafted polystyrene compatibilizer is controlled within the range of 5% to 20%. When the grafting rate is below 5%, the number of PS branches is insufficient, resulting in fewer interfacial interaction sites with Bio-ABS and poor compatibilization effect. When the grafting rate is above 20%, excessive PS branches will crowd out the bonding space between the PE main chain and Bio-ABS, reducing compatibility with Bio-PE and leading to an imbalance in alloy properties. Simultaneously, the compatibilizer purity is ≥99.5%, and unreacted monomers and low molecular weight impurities are removed through subsequent washing, drying, and other post-treatment processes to prevent impurities from affecting the mechanical properties and processing stability of the alloy.

[0027] This unique structure, which combines PE main chain compatibility with Bio-PE and PS branch chain compatibility with Bio-ABS, creates a stable "interface bridge" between the incompatible Bio-PE and Bio-ABS phases. This improves phase dispersion, reduces phase size, and strengthens interfacial adhesion, thereby allowing the alloy to retain or even enhance its impact strength (especially low-temperature impact strength) while maintaining the original rigidity and strength of Bio-ABS.

[0028] Furthermore, the polyethylene-grafted polystyrene compatibilizer itself has excellent thermal stability and melt flowability. Its introduction will not have a negative impact on the melting and processing of the alloy. The material is suitable for various molding processes such as injection molding and extrusion.

[0029] As a preferred technical solution in this embodiment, the Bio-PE resin is preferably bio-based high-density polyethylene (Bio-HDPE) or bio-based linear low-density polyethylene (Bio-LLDPE), and its bio-based carbon content is not less than 90% as determined by ASTM D6866 standard. Bio-HDPE has high crystallinity, which can give the alloy excellent rigidity and heat resistance, and has a better rigidity matching with Bio-ABS, making it suitable for manufacturing structural parts, shells and other products with high strength requirements; Bio-LLDPE has more branched structure, better toughness and tear resistance, but lower rigidity, making it suitable for manufacturing thin-walled products or applications with extremely high toughness requirements.

[0030] Furthermore, in the Bio-ABS resin, the content of the rubber phase (polybutadiene) is preferably 10%~25%, and the AN content is preferably 20%~30%. When the polybutadiene content is less than 10%, the impact toughness of the Bio-ABS resin itself is insufficient, making it difficult to support the impact resistance requirements of the alloy material; when the polybutadiene content is greater than 25%, it will lead to a decrease in the rigidity and heat resistance of the Bio-ABS resin, thereby affecting the overall mechanical balance of the alloy material. The introduction of acrylonitrile (AN) units can improve the rigidity, chemical corrosion resistance, and reactivity with compatibilizers of Bio-ABS resin. When the AN content is less than 20%, the reaction efficiency with the reactive functional groups in the hydrogenated block copolymer compatibilizer decreases, and the interfacial bonding effect deteriorates; when the AN content is greater than 30%, the toughness of the Bio-ABS resin will be significantly reduced, and the processing fluidity will deteriorate, which is not conducive to melt blending with Bio-PE. Therefore, controlling the AN content within the range of 20%~30% can achieve the best balance between the rigidity, toughness, and reactivity of the Bio-ABS resin.

[0031] As an optional technical solution in this embodiment, the auxiliary additives are one or more of antioxidants, lubricants, and stabilizers. The antioxidant is preferably a compound system of hindered phenolic primary antioxidants (such as antioxidant 1010, antioxidant 1076) and phosphite auxiliary antioxidants (such as antioxidant 168), which can effectively inhibit the oxidative degradation of resin during melt processing and long-term use, extending the service life of the material. The lubricant is preferably a stearic acid (such as zinc stearate, calcium stearate) or an amide lubricant (such as ethylene bis-stearamide EBS), which can reduce the melt viscosity and equipment wear during processing, improve the surface gloss of the product, and avoid processing defects such as melt fracture. The stabilizer can be a heat stabilizer or a light stabilizer selected according to actual needs. The heat stabilizer is preferably an organotin or calcium-zinc composite, used to improve the thermal stability of the material during high-temperature processing. The light stabilizer is preferably a benzotriazole or hindered amine, suitable for alloy products used outdoors, which can delay the photo-aging degradation of the material and maintain the appearance and performance stability of the product.

[0032] Example 2 like Figure 1 As shown, this embodiment provides a method for preparing the alloy material as described in Embodiment 1, comprising the following steps: S1. Preparation of polyethylene-grafted polystyrene compatibilizer: The PE backbone is activated and modified by plasma treatment or peroxide initiation to form active free radical sites on its molecular chain, providing reaction sites for grafting. At the same time, the density of active sites is controlled to avoid excessive cross-linking of the PE backbone. Subsequently, under the protection of inert gas (such as nitrogen or argon), the activated PE backbone and styrene monomer are put into a reaction device for in-situ grafting polymerization. The reaction temperature is controlled at 80~120℃ and the reaction time is controlled at 2~4h. The grafting rate is controlled to 5%~20% by adjusting the amount of styrene monomer. After polymerization, the product granules of compatibilizer are obtained by washing, drying and granulation.

[0033] S2, Raw material premixing: Bio-ABS resin, Bio-PE resin, polyethylene grafted polystyrene compatibilizer and auxiliary additives (if any) prepared in step S1 are fully premixed in a high-speed mixer according to the specified ratio to obtain a premix; wherein, the operating conditions of the high-speed mixer include: stirring and mixing for 20 to 30 minutes at 50~60℃ and 350~450r / min to ensure sufficient mixing.

[0034] S3. Melt blending and granulation: The premixed material is fed into a twin-screw extruder and undergoes a melt-blending reaction under set process conditions. After extrusion, it is sequentially water-cooled, traction-processed, and pelletized to obtain alloy particles. The processing temperature range of the twin-screw extruder is 180℃~240℃ to ensure stable material properties. The screw speed is 200~500rpm to achieve efficient mixing and dispersion of the molten material. The material residence time is controlled at 1~3 minutes to ensure full fusion of the two phases.

[0035] The above preparation method includes an in-situ preparation step of compatibilizer, the process is continuous, and the whole process can be achieved by melt blending. There is no need for complex pretreatment of the matrix resin. The process is simple and easy to realize industrial production.

[0036] Four examples and two comparative examples are provided below to further explain the solution of the present invention.

[0037] Example 1 This example uses the formulation of Example 1 and the preparation method of Example 2 to prepare a specific alloy material.

[0038] Specific formula (by weight percentage): Bio-ABS resin: 55%, brand name MAGNUM™BIOABS BIO95, Shengxi'ao; Bio-PE resin: 40%, bio-based HDPE, grade SHC7260, Braskem (Brazil), bio-based carbon content >94%; Compatibilizer A: 5%, polyethylene-grafted polystyrene compatibilizer (grafting rate ~10wt%, purity 99.5%).

[0039] Preparation process: S1. Preparation of compatibilizer A: The PE main chain is activated by peroxide initiation, and in situ grafted with styrene monomer at 100°C for 3 hours under nitrogen protection. After washing with toluene, vacuum drying at 90°C for 5 hours, and granulation at 170°C, compatibilizer A with a grafting rate of 10% and a purity of 99.6% is obtained. S2. Mix the components in a high-speed mixer for 25 minutes (temperature 55℃, speed 400r / min) to obtain a premix. S3. Add the mixture to a co-rotating twin-screw extruder (length-to-diameter ratio 40:1) for melt blending, extrusion, and granulation. Set the temperatures of each section of the extruder as follows: feeding section 180℃, melting section 190-210℃, homogenization section 210-220℃, die head 220℃, and screw speed 350rpm. After drying the granules at 85℃ for 4 hours, they are then molded using an injection molding machine.

[0040] Example 2 The difference between this example and Example 1 lies in the ingredient ratios; otherwise, they are identical. The ingredient ratios used in this example are as follows: Bio-ABS resin: 50%, brand name MAGNUM™BIOABS BIO95, Shengxi'ao; Bio-PE resin 45%, bio-based HDPE, grade SHC7260, Braskem, Brazil, bio-based carbon content >94%; Compatibilizer A: 5%, polyethylene-grafted polystyrene compatibilizer (grafting rate ~10wt%, purity 99.5%).

[0041] Example 3 The difference between this example and Example 1 lies in the ingredient ratios; otherwise, they are identical. The ingredient ratios used in this example are as follows: Bio-ABS resin: 45%, grade SHC7260, Braskem, Brazil; Bio-PE resin: 50%, bio-based HDPE, grade SHC7260, Braskem (Brazil), bio-based carbon content >94%; Compatibilizer A: 5%, polyethylene-grafted polystyrene compatibilizer (grafting rate ~10wt%, purity 99.5%).

[0042] Example 4 The difference between this example and Example 1 lies in the ingredient ratios; otherwise, they are identical. The ingredient ratios used in this example are as follows: Bio-ABS resin: 60%, grade SHC7260, Braskem, Brazil; Bio-PE resin: 35%, bio-based HDPE, grade SHC7260, Braskem (Brazil), bio-based carbon content >94%; Compatibilizer A: 5%, polyethylene-grafted polystyrene compatibilizer (grafting rate ~10wt%, purity 99.5%).

[0043] Comparative Example 1 The difference between this comparative example and Example 1 lies in the choice of compatibilizer; all other aspects are the same as in Example 1, and the raw materials are formulated in the following proportions: Bio-ABS resin: 50%, grade SHC7260, Braskem, Brazil; Bio-PE resin: 45%, bio-based HDPE, grade SHC7260, Braskem (Brazil), bio-based carbon content >94%; Compatibilizer B: 5%, ordinary SEBS.

[0044] Comparative Example 2 The difference between this comparative example and Comparative Example 1 is that no compatibilizer was used; otherwise, they are the same as Comparative Example 1.

[0045] The mechanical properties of the alloy materials in Examples 1 to 4, Comparative Example 1 and Comparative Example 2 were tested according to the relevant national standards. The test results are shown in Table 1.

[0046] Table 1 In Table 1, the tensile strength standard is GB / T1040.2-2006; the flexural modulus standard is GB / T9341-2008; the notched impact strength of simply supported beams (23℃) is GB / T1043.1-2008; and the melt mass flow rate (MFR, 220℃, 10kg) standard is GB / T3682.1-2018.

[0047] As shown in Table 1, the alloy materials prepared in Examples 1 to 4 of this invention, even with a Bio-PE content as high as 35%-50%, still maintain excellent comprehensive mechanical properties: tensile strength remains above 34.8 MPa, flexural modulus above 1750 MPa, and in particular, notched impact strength reaches 20 kJ / m. 2 The above demonstrates an extremely high level of toughness, which proves the key role of the polyethylene-grafted polystyrene compatibilizer of this invention.

[0048] In Comparative Example 2, no compatibilizer was added. Although the Bio-PE content was 45%, the alloy exhibited severe phase separation and extremely poor interfacial adhesion, resulting in a sharp drop in its impact strength to 14.2 kJ / m. 2 The material becomes brittle, and its tensile strength and modulus are significantly lower than those of the embodiments of the present invention.

[0049] In Comparative Example 1, non-reactive ordinary SEBS was used as a compatibilizer. Its compatibilizing effect was superior to that of Comparative Example 2, increasing the impact strength to 16.5 kJ / m². 2 However, it is still far lower than that of Example 2 (45% Bio-PE, impact strength 24.1 kJ / m²) using an equal amount of compatibilizer A. 2 This clearly demonstrates the indispensability of the "polyethylene-grafted polystyrene compatibilizer" of this invention for building strong interfaces and achieving high compatibilization efficiency.

[0050] Combined with reference Figure 2 The image shows the infrared spectrum of the alloy material produced in Example 1. It can be seen from this image that a 2916 cm⁻¹ pattern appears on the ABS substrate. -1 The -CH2- asymmetric CH absorption peak is at 2848 cm⁻¹. -1 The -CH2- symmetric CH absorption peak and the asymmetric CH absorption peak are both present at 719 cm⁻¹. -1 729cm -1 The presence of a methylene vibration absorption peak in PE indicates that Bio-PE / Bio-ABS is well compatible.

[0051] In summary, the polyethylene-grafted polystyrene compatibilizer introduced in this invention successfully solves the compatibility problem in the alloying process of high-proportion bio-based polyethylene and Bio-ABS. The resulting material has both high bio-based content, low carbon and environmentally friendly characteristics, and excellent mechanical properties, and has broad prospects for industrial application.

[0052] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A Bio-ABS / Bio-PE alloy material, characterized in that, By weight percentage, it comprises the following components: 40%~65% Bio-ABS resin; 30%~55% Bio-PE resin; Polyethylene-grafted polystyrene compatibilizer 3%~15%; The PE backbone of the polyethylene-grafted polystyrene compatibilizer is activated and modified to form active free radical sites on the PE molecular chain, and its PS branch chain is formed by in-situ grafting polymerization of styrene monomer on the activated PE backbone.

2. The Bio-ABS / Bio-PE alloy material as described in claim 1, characterized in that, The purity of the polyethylene-grafted polystyrene compatibilizer is ≥99.5%.

3. The Bio-ABS / Bio-PE alloy material as described in claim 1, characterized in that, The grafting rate of the PE backbone and its PS branch in the polyethylene-grafted polystyrene compatibilizer is adjustable within the range of 5% to 20%.

4. The Bio-ABS / Bio-PE alloy material as described in claim 1, characterized in that, The Bio-PE resin is bio-based high-density polyethylene or bio-based linear low-density polyethylene, with a bio-based carbon content ≥90%.

5. The Bio-ABS / Bio-PE alloy material as described in claim 1, characterized in that, The Bio-ABS resin contains 10% to 25% polybutadiene and 20% to 30% acrylonitrile.

6. The Bio-ABS / Bio-PE alloy material as described in claim 1, characterized in that, By weight percentage, it also includes 0% to 5% auxiliary agents, which are one or more of antioxidants, lubricants and stabilizers.

7. A method for preparing the Bio-ABS / Bio-PE alloy material as described in any one of claims 1-6, characterized in that, Includes the following steps: S1. Preparation of polyethylene-grafted polystyrene compatibilizer: Active free radical sites are formed on the PE main chain molecular chain through activation modification. Then, under the protection of inert gas, the activated PE main chain is grafted with styrene monomer in situ. After post-treatment, the polyethylene-grafted polystyrene compatibilizer is obtained. S2. Raw material premixing: Bio-ABS resin, Bio-PE resin, and the prepared polyethylene grafted polystyrene compatibilizer or auxiliary additives are fully premixed in a high-speed mixer according to the proportion to obtain a premix. S3. Melt blending and granulation: The premixed material is fed into a twin-screw extruder and melt blended under set process conditions. After extrusion, it is sequentially cooled by water, drawn and granulated to obtain alloy particles.

8. The method for preparing Bio-ABS / Bio-PE alloy material as described in claim 7, characterized in that, In step S1, the post-processing steps include sequential washing, granulation, and drying processes.

9. The method for preparing Bio-ABS / Bio-PE alloy material as described in claim 7, characterized in that, In step S1, during the in-situ graft polymerization process, the amount of styrene monomer, the reaction temperature, and the reaction time are controlled within a reasonable range. The reaction temperature ranges from 80 to 120°C, and the reaction time ranges from 2 to 4 hours.

10. The method for preparing Bio-ABS / Bio-PE alloy material as described in claim 7, characterized in that, In step S3, the processing temperature range of the twin-screw extruder is 180℃~240℃, the screw speed is 200~500rpm, and the material residence time is controlled within 1~3min.

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