A petroleum resin blend-modified polypropylene polyethylene composite

Abstract

The application provides a petroleum resin blended modified polypropylene polyethylene composite material, which combines the advantages and disadvantages of polypropylene, polyethylene and petroleum resin materials, uses hydrogenated C5 petroleum resin and hydrogenated C9 petroleum resin to blend modify polypropylene polyethylene to manufacture the composite material, solves the compatibility of waste recycled polypropylene and polyethylene materials and petroleum resin, and prepares a high polymer material with relatively optimal comprehensive mechanical properties, and has relatively advanced technical process and application value. The application effectively explores the utilization strategy of mixed polypropylene polyethylene recycled materials, increases the utilization efficiency, reduces secondary pollution, increases the economic benefits of recycling, and further improves the subjective initiative of enterprises for recycling; through recycling of waste materials, environmental pollution is reduced, and sustainable development of human and nature is realized.

Description

Technical Field

[0001] This invention belongs to the field of composite material technology, and particularly relates to a polypropylene-polyethylene composite material modified by blending with petroleum resin. Background Technology

[0002] Rapid urbanization and industrialization have led to an unprecedented increase in the amount of waste plastics. Polypropylene and polyethylene are two of the most widely used plastics. Both polypropylene and polyethylene have very large usage and recycling volumes, resulting in a huge amount of recycling. However, during the recycling process, polypropylene and polyethylene materials usually exist in the form of a mixture. Due to the differences in the molecular structure of polypropylene and polyethylene materials, their compatibility is poor. Simple blending and modification of polypropylene materials for recycling usually results in composite materials with poor mechanical properties, affecting their reuse. Modifying agents need to be added during the blending and modification process of polypropylene and polyethylene to improve the compatibility between polypropylene and polyethylene molecules.

[0003] Recycled polyethylene and polypropylene can be used to manufacture various plastic products, such as plastic packaging, pipes, and containers. Furthermore, they can be used to manufacture automotive parts and various laboratory equipment. As industrial masterbatch products, their comprehensive properties need to be considered, such as tensile strength, elongation at break, flexural strength, flexural modulus, and impact strength. However, existing recycled polypropylene and polyethylene, due to impurities or long-term aging and degradation, often result in composite materials whose properties do not meet comprehensive performance requirements when blended. This invention aims to address the compatibility issues of recycled polypropylene or polyethylene blends and, based on a reasonable blending ratio, further improve the comprehensive performance of recycled composite materials.

[0004] Petroleum resin is a byproduct of my country's refining and chemical industry and a product of large-scale production by downstream enterprises. With the development of the petroleum industry, its production has increased year by year in recent years, including C5 / C9 copolymer petroleum resin, hydrogenated C5 petroleum resin, and hydrogenated C9 petroleum resin. Blending petroleum resin with other materials provides softening, reinforcing, and tackifying effects, improving the mutual adhesion and extensibility between modified materials. During processing, it facilitates molding, prevents delamination, and prevents bubble formation, thus improving the anti-stripping properties of composite materials. It can also improve and enhance tensile strength and elongation.

[0005] While numerous reports exist on the blending and modification of polypropylene and polyethylene, none have documented the use of C5 / C9 copolymer resins, hydrogenated C5 petroleum resins, or hydrogenated C9 petroleum resins to modify polypropylene-polyethylene composites. Building upon previous research, this invention improves the compatibility between recycled polypropylene and polyethylene by adding petroleum resin. Furthermore, by adding inorganic additives such as calcium sulfate and calcium carbonate, a novel petroleum resin-modified polypropylene-polyethylene composite material is obtained, meeting comprehensive mechanical property requirements. This new composite material exhibits excellent compatibility between polyethylene and polypropylene. This invention integrates the advantages and disadvantages of materials such as polypropylene / polyethylene / petroleum resin, utilizing hydrogenated C5 and C9 petroleum resins to modify polypropylene-polyethylene composites. This solves the compatibility issues between polypropylene, polyethylene, and petroleum resins, resulting in a polymer material with superior comprehensive mechanical properties and significant industrial application value. Summary of the Invention

[0006] This invention addresses the problems of poor compatibility and overall poor mechanical properties of existing recycled polypropylene and polyethylene blends. It provides a petroleum resin-modified polypropylene-polyethylene composite material. By adding petroleum resin, the compatibility of polypropylene and polyethylene is improved. Furthermore, through the combined use of petroleum resin and inorganic additives, the recycling and reuse of polypropylene and polyethylene materials can be achieved, improving the overall mechanical properties of the recycled composite material, particularly in impact resistance. While maintaining other properties or basic properties unchanged, the impact strength and impact resistance are improved. Moreover, the interaction between petroleum resin and inorganic additives reduces the amount of polypropylene used, ensuring good product performance.

[0007] The first aspect of the present invention provides a petroleum resin-modified polypropylene-polyethylene composite material, wherein the composite material comprises the following components and their weight percentages: polypropylene: 65% to 95%; polyethylene: 5% to 15%; petroleum resin: 1% to 10%.

[0008] Furthermore, the polypropylene and polyethylene are commercially available recycled materials, and the petroleum resin is one or more of hydrogenated C5 petroleum resin, hydrogenated C9 petroleum resin, and C5 / C9 copolymer petroleum resin. The recycled polypropylene and polyethylene materials contain impurities, and the polymers undergo aging and degradation, leading to poor compatibility and overall poor mechanical properties during recycling. However, polypropylene and petroleum resin have good compatibility; the addition of petroleum resin can fill the lattice defects in the amorphous regions of the polypropylene molecules, promoting compatibility with polyethylene and increasing the density between polymer molecules in the blend.

[0009] Furthermore, the amount of recycled polypropylene and polyethylene used has a significant impact on the performance of blended composite materials. Only composite materials formed by combining 65%–95% polypropylene and 5%–15% polyethylene have good overall performance, with good impact strength and flexural strength.

[0010] Furthermore, the composite material comprises the following components and their weight percentages: polypropylene: 80%–90%; polyethylene: 10%; petroleum resin: 1–10%, wherein the petroleum resin is hydrogenated C5 petroleum resin. Hydrogenated C5 petroleum resin has better compatibility and overall mechanical properties with polypropylene and polyethylene than C9 petroleum resin. This is mainly because C5 petroleum resin is primarily composed of low molecular weight molecules, while C9 petroleum resin is primarily composed of aromatic structures. C5 has better compatibility with polypropylene and polyethylene than C9, and it can better penetrate into the gaps for polymerization, thereby improving its impact strength and flexural strength.

[0011] Furthermore, the composite material also contains inorganic additives. The components and their weight percentages in the composite material are as follows: polypropylene: 65%–85%; polyethylene: 5%–15%; petroleum resin: 1%–10%; inorganic additives: 5%–20%, wherein the petroleum resin is hydrogenated C5 petroleum resin or hydrogenated C9 petroleum resin. This invention discovers that the interaction between C5 petroleum resin and inorganic additives can greatly improve the impact strength of the composite material and reduce the amount of polypropylene used, thus saving preparation costs. Furthermore, the composite material also contains inorganic additives. The components and their weight percentages in the composite material are as follows: polypropylene: 78%; polyethylene: 10%; petroleum resin: 2%; inorganic additives: 10%; wherein the petroleum resin is hydrogenated C5 petroleum resin. Furthermore, the inorganic additives are one or more of calcium sulfate and calcium carbonate.

[0012] A second aspect of the present invention provides a method for preparing a petroleum resin-modified polypropylene-polyethylene composite material, the method comprising the following steps:

[0013] S1 Weigh each component according to its content, stir and mix to obtain a mixture;

[0014] S2. The above-mentioned well-mixed material is added to a twin-screw extruder, the extrusion conditions are set, and the material is extruded and granulated to prepare a composite material.

[0015] S3 dries the extruded granulated particles and adds them to the injection molding machine. The injection molding conditions are set as follows: temperature 210±20℃, pressure 70 bar, mold cooling time 6.0 seconds; holding pressure during injection is 40 bar, holding time 5 seconds. Injection molding is used for specimen shapes required for mechanical property testing or for products undergoing subsequent processing.

[0016] Furthermore, step S1 also includes a crushing process for the mixed materials, which fully crushes the recovered polypropylene and polyethylene, which is beneficial for the uniform dispersion of the materials and for the full penetration and mixing of petroleum resin.

[0017] Furthermore, the extrusion conditions of the extruder are set as follows: zone 1 temperature 150℃, zone 2 temperature 200℃, zone 3 temperature 210℃, zone 4 temperature 215℃, die head temperature control 210℃, melt temperature 219℃, melt pressure 0.2MPa, main machine speed 20.89Hz, the extruded sample is water-cooled and then pelletized, and the pellets are dried at 110℃ for 6 hours.

[0018] The beneficial effects of this invention are as follows:

[0019] The composite material provided by this invention uses recycled polypropylene and polyethylene as raw materials. This process technology is also applicable to the blending modification of virgin polypropylene and polyethylene materials. The matrix material is used in the composite material; the petroleum resin is commercially available hydrogenated C5 petroleum resin, hydrogenated C9 petroleum resin, C5 / C9 copolymer petroleum resin, etc., which, due to their adhesive properties, are used to improve the compatibility between molecules in the polyethylene / polypropylene composite material; the inorganic additives are usually calcium sulfate, calcium carbonate, etc., used to optimize the mechanical properties of the petroleum resin-modified polypropylene / polyethylene material, while also appropriately reducing the cost of the composite material, making it more valuable in the market.

[0020] This invention provides a petroleum resin-modified polypropylene-polyethylene composite material. By adding petroleum resin, the compatibility of polypropylene and polyethylene is improved. Furthermore, the combined use of petroleum resin and inorganic additives enables the recycling and reuse of polypropylene and polyethylene materials, improving the overall mechanical properties of the recycled composite material, particularly in impact resistance. While maintaining other properties or basic properties unchanged, the impact strength and impact resistance are enhanced. Moreover, the interaction between petroleum resin and inorganic additives reduces the amount of polypropylene used, ensuring good product performance.

[0021] This invention utilizes hydrogenated C5 petroleum resin and hydrogenated C9 petroleum resin to modify polypropylene and polyethylene to prepare novel composite materials. By solving the compatibility issues between mixed waste polypropylene and polyethylene materials and hydrogenated C5 and C9 petroleum resins, two polymer materials with superior comprehensive mechanical properties were prepared, demonstrating advanced process technology and application value.

[0022] This invention is the first to explore a strategy for utilizing mixed polypropylene and polyethylene recycled materials, which increases utilization efficiency, reduces secondary pollution, increases the economic benefits of reuse, and thereby enhances enterprises' initiative in recycling; by recycling waste materials, environmental pollution is reduced, and sustainable development between humans and nature is achieved. Attached Figure Description

[0023] Figure 1 Here is a scanning electron microscope image of the fracture surface of the composite material in Example 1;

[0024] Figure 2 Here is a scanning electron microscope image of the fracture surface of the composite material in Example 2;

[0025] Figure 3 Here is a scanning electron microscope image of the fracture surface of the composite material in Example 3;

[0026] Figure 4 Here is a scanning electron microscope image of the fracture surface of the composite material in Example 13;

[0027] Figure 5 Here is a scanning electron microscope image of the fracture surface of the composite material in Example 22;

[0028] Figure 6 This is a scanning electron microscope image of the fracture surface of the composite material in Example 28. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to Embodiments 1-35 and the accompanying drawings.

[0030] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. It should be understood that the following description is merely illustrative and is not intended to limit the invention.

[0031] The terms “comprising,” “including,” “having,” “containing,” or any other variations thereof, as used herein, are intended to cover a non-exclusive inclusion. A composition, step, method, article, or apparatus that includes the listed elements is not necessarily limited to those elements, but may include other elements not expressly listed or elements inherent to such composition, step, method, article, or apparatus.

[0032] The phrase "composed of..." excludes any unspecified elements, steps, or components. If used in a claim, this phrase makes the claim closed, excluding materials other than those described, except for conventional impurities associated with them. When the phrase "composed of..." appears in a clause of the body of a claim rather than immediately following it, it limits only the elements described in that clause; other elements are not excluded from the claim as a whole.

[0033] When a dosage, concentration, or other value or parameter is expressed as a range, a preferred range, or a range defined by a series of upper and lower preferred values, this should be understood as specifically disclosing all ranges formed by any pair of any upper or preferred value with any lower or preferred value, regardless of whether the range is disclosed individually. For example, when the range “1 to 5” is disclosed, the described range should be interpreted as including ranges “1 to 4,” “1 to 3,” “1 to 2,” “1 to 2 and 4 to 5,” “1 to 3 and 5,” etc. When numerical ranges are described herein, unless otherwise stated, the range is intended to include its endpoints and all integers and fractions within that range.

[0034] In some instances, approximate terms may correspond to the instrument precision of the measured values. In this specification and claims, scope definitions may be combined and / or interchanged. Unless otherwise stated, these scopes include all subscopes contained therein.

[0035] The indefinite articles “a” and “an” preceding an element or component of this invention do not impose any limitation on the number of elements or components (i.e., the number of times they appear). Therefore, “an” or “a” should be interpreted as including one or at least one, and the singular form of an element or component also includes the plural form, unless the quantity clearly refers only to the singular form.

[0036] The terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., used in this invention refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms are not necessarily directed at the same embodiment or example. Furthermore, the technical features involved in the various embodiments of the invention can be combined with each other as long as they do not conflict with each other.

[0037] Explanation of technical terms:

[0038] Tensile strength refers to the maximum tensile force a material can withstand before fracture in a tensile test, i.e., the maximum stress per unit area. It is calculated by dividing the maximum load value in the tensile test by the cross-sectional area of ​​the specimen.

[0039] Elongation at break refers to the ratio of the difference between the length of the material after stretching and its original length before fracture, expressed as a percentage. It is a material property index used to measure a material's ability to stretch and ductile under stress, and is also an important parameter of material mechanical properties.

[0040] The standard definition of flexural strength is the maximum stress a material can withstand under bending load or when a specified bending moment is reached. It is defined as the maximum normal stress during bending, expressed in MPa (megapascals).

[0041] Bending modulus, also known as bending stiffness, is the ability of a material to resist bending deformation when subjected to bending loads. It is defined as the ratio of stress to strain per unit cross-sectional area of ​​material under bending load. Bending modulus reflects the degree of a material's response to bending stress and is an important indicator for measuring a material's stiffness and bending resistance.

[0042] The formula for bending modulus is: Bending modulus = Bending moment / Curvature = (FL^3) / (4E*I), where F is the bending moment, L is the beam length, E is the elastic modulus of the material, and I is the moment of inertia of the section. The unit of bending modulus is usually Newtons per square meter (N / m). 2 () or Pascal (Pa)

[0043] Impact strength is the ratio of the energy absorbed by a specimen during impact failure to its original cross-sectional area. It is used to evaluate a material's impact resistance or to determine its brittleness and toughness; it is also known as impact toughness. The main standards for measuring impact strength are the ISO international standard (GB refers to ISO) and the American Society for Materials (ASTM) standard.

[0044] GB / T 1043.1-2008, the standard for the impact resistance of plastic specimens in a simply supported beam impact test, specifies the test conditions, calculation of results, and test reporting for determining the impact resistance of plastic specimens under specified conditions. It is applicable to various types of plastic materials, including thermoplastics and thermosetting plastics. In the simply supported beam impact test, the specimen is placed on a simply supported beam, fixed at one end, and subjected to an impact force at the other end. The impact force is generated by a pendulum striking the specimen with a certain speed and energy. Under the impact force, the specimen will bend and fracture. The impact strength of the specimen can be calculated by measuring the energy absorbed before fracture and the cross-sectional area of ​​the specimen.

[0045] In some embodiments, a petroleum resin-modified polypropylene-polyethylene composite material is provided, wherein the composite material comprises the following components and their weight percentages: polypropylene: 65%–95%; polyethylene: 5%–15%; petroleum resin: 1%–10%; wherein the polypropylene and polyethylene are commercially available recycled materials, and the petroleum resin is one or more of hydrogenated C5 petroleum resin, hydrogenated C9 petroleum resin, and C5 / C9 copolymer petroleum resin. The polypropylene content can be 65%, 70%, 75%, 80%, 85%, 90%, or 95%; the polyethylene content can be 5%, 10%, or 15%.

[0046] In some embodiments, the components of the composite material and the weight percentage of each component are as follows: polypropylene: 80% to 90%; polyethylene: 10%; petroleum resin: 1-10%; wherein the petroleum resin is hydrogenated C5 petroleum resin.

[0047] In some embodiments, the petroleum resin-modified polypropylene-polyethylene composite material is characterized in that the composite material further comprises inorganic additives, and the components and their weight percentages in the composite material are as follows: polypropylene: 65%-85%; polyethylene: 5%-15%; petroleum resin: 1%-10%; inorganic additives: 5%-20%; wherein the petroleum resin is hydrogenated C5 petroleum resin or hydrogenated C9 petroleum resin.

[0048] Furthermore, the composite material comprises the following components and their weight percentages: polypropylene: 78%; polyethylene: 10%; petroleum resin: 2%; inorganic additives: 10%; wherein the petroleum resin is hydrogenated C5 petroleum resin. The inorganic additives are one or more of calcium sulfate and calcium carbonate.

[0049] In some embodiments, a method for preparing a petroleum resin-modified polypropylene-polyethylene composite material is provided, characterized in that the preparation method includes the following steps:

[0050] S1 Weigh each component according to its content, stir and mix to obtain a mixture;

[0051] S2. The above-mentioned well-mixed material is added to a twin-screw extruder, the extrusion conditions are set, and the material is extruded and granulated to obtain novel petroleum resin blended modified polypropylene / polyethylene composite material particles.

[0052] S3 dries the extruded granulated particles and adds them to the injection molding machine. The injection molding conditions are set as follows: temperature 210±20℃, pressure 70 bar, mold cooling time 6.0 seconds; holding pressure during injection is 40 bar, holding time 5 seconds. Mechanical property testing of the injection molded product requires a sample shape or a product from subsequent processing.

[0053] Furthermore, step S1 also includes a pulverizing process for the mixture. Further, the extrusion conditions of the extruder are set as follows: zone 1 temperature 150℃, zone 2 temperature 200℃, zone 3 temperature 210℃, zone 4 temperature 215℃, die head temperature control 210℃, melt temperature 219℃, melt pressure 0.2MPa, main extruder speed 20.89Hz, the extruded sample is water-cooled and then pelletized, and the pellets are dried at 110℃ for 6 hours.

[0054] Furthermore, the injection molding conditions are: temperature 210±20℃, pressure 70 bar, and mold cooling time 6.0 seconds; the holding pressure conditions during injection molding are: pressure 40 bar and holding time 5 seconds.

[0055] Furthermore, the injection molding is for the purpose of testing mechanical properties by producing a sample shape or a product that requires subsequent processing.

[0056] Unless otherwise specified, the raw materials and equipment used in this invention can be purchased from the market or are commonly used in the field. Unless otherwise specified, the methods in the embodiments are conventional methods in the field.

[0057] The following description, in conjunction with specific implementation methods, provides further details.

[0058] Example 1

[0059] 100 parts of recycled polypropylene were weighed, thoroughly crushed, and mixed. The mixture was then fed into a twin-screw extruder, and the extrusion conditions were set as follows: Zone 1 temperature 150℃, Zone 2 temperature 200℃, Zone 3 temperature 210℃, Zone 4 temperature 215℃, die head temperature control 210℃, melt temperature 219℃, melt pressure 0.2MPa, and main extruder speed 20.89Hz. The extruded sample was water-cooled and then granulated. The granules were dried at 110℃ for 6 hours. The obtained product was subjected to performance characterization. The specific parameters and composition of the product are shown in Table 1.

[0060] Example 2

[0061] 95 parts of recycled polypropylene and 5 parts of recycled polyethylene were weighed, thoroughly crushed, and mixed. The mixture was then fed into a twin-screw extruder, and the extrusion conditions were set as follows: Zone 1 temperature 150℃, Zone 2 temperature 200℃, Zone 3 temperature 210℃, Zone 4 temperature 215℃, die head temperature control 210℃, melt temperature 219℃, melt pressure 0.2MPa, and main extruder speed 20.89Hz. The extruded sample was water-cooled and then pelletized. The pellets were dried at 110℃ for 6 hours. The obtained product was subjected to performance characterization. The specific parameters and composition of the product are shown in Table 1.

[0062] The raw material composition of Examples 3-35 differs from that of Examples 1-2, while the other steps are completely consistent with those of Examples 1-2. The specific composition and performance parameters of each example are shown in Table 1.

[0063] Table 1. Composition and properties of petroleum resin-modified mixed polypropylene and polyethylene composite materials

[0064]

[0065]

[0066] (1) Examples 1-12 studied the content ratio of recycled polypropylene and polyethylene. The data showed that the composite material obtained by mixing recycled polyethylene and polypropylene with different composition contents had different comprehensive properties. Only when the composition range of polypropylene: 65% to 95% and polyethylene: 5% to 35% can the flexural strength be kept constant and the impact strength be guaranteed. Therefore, the composite material with good performance can only be obtained by mixing recycled polypropylene and polyethylene with certain composition contents.

[0067] (2) Data from Examples 13-17 show that an appropriate amount of C5 petroleum resin can improve the compatibility of polyethylene and polypropylene and enhance the overall mechanical properties. For example, a comparison of the data from Examples 13 and Examples 2-3 reveals that tensile strength, elongation at break, flexural strength, flexural modulus, and impact strength are all improved to some extent. Data from Examples 18-21 show that the synergistic modification of C5 with inorganic additives can greatly improve its impact resistance, ensure stable flexural strength, and reduce the use of polypropylene, thereby reducing preparation costs.

[0068] (3) Data from Examples 22-26 show that an appropriate amount of C9 petroleum resin can improve the flexural modulus; data from Examples 27-30 show that C9 and inorganic additives can synergistically improve the flexural modulus and impact strength.

[0069] (4) Data from Examples 31-35 show that a certain amount of C5 / C9 copolymer petroleum resin can be added at 2% to obtain certain modified properties.

[0070] (5) Figure 1-4 The attached diagram illustrates that adding C5 resin can eliminate the gaps between polypropylene and polyethylene in the composite material, increasing compatibility. Figure 1 For the recycling of polypropylene, there are internal gaps, attached Figure 2-3 The composite material is made of polyethylene and polypropylene without the addition of petroleum resin, and has obvious gaps inside. Figure 5 There were no obvious cracks on the fracture surface, indicating that C9 petroleum resin can also improve compatibility. However, the fracture surface has an uneven porous structure, and its compatibility is slightly worse than that of C5 resin. Figure 6 The presence of fine particles on the fracture surface indicates the presence of incorporated inorganic particles, and the presence of a porous structure suggests that the compatibility is slightly worse than that of C4.

[0071] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A petroleum resin-modified polypropylene-polyethylene composite material, characterized in that, The components and their weight percentages in the composite material are as follows: Polypropylene: 65%~85%; Polyethylene: 5%-15%; Petroleum resin: 1%-10%; Inorganic additives: 5%-20%; Polypropylene and polyethylene are commercially available recycled materials, and the petroleum resin is hydrogenated C5 petroleum resin; the inorganic additives are one or more of calcium sulfate and calcium carbonate.

2. The petroleum resin-modified polypropylene-polyethylene composite material according to claim 1, characterized in that, The components and their weight percentages in the composite material are as follows: Polypropylene: 78% Polyethylene: 10% Petroleum resin: 2% Inorganic additives: 10% The petroleum resin is hydrogenated C5 petroleum resin.

3. A method for preparing a petroleum resin-modified polypropylene-polyethylene composite material according to any one of claims 1-2, characterized in that, The preparation method includes the following steps: S1 Weigh each component according to its content, stir and mix to obtain a mixture; S2. Add the above-mentioned well-stirred mixture to a twin-screw extruder, set the extrusion conditions, extrude and granulate to obtain the composite material.

4. The method for preparing petroleum resin-modified polypropylene-polyethylene composite material according to claim 3, characterized in that, Step S1 also includes a crushing process for the mixture.

5. The method for preparing petroleum resin-modified polypropylene-polyethylene composite material according to any one of claims 3-4, characterized in that, The extrusion conditions of the extruder are set as follows: Zone 1 temperature 150℃, Zone 2 temperature 200℃, Zone 3 temperature 210℃, Zone 4 temperature 215℃, die head temperature control 210℃, melt temperature 219℃, melt pressure 0.2MPa, main machine speed 20.89Hz, the extruded sample is water-cooled and then pelletized, and the pellets are dried at 110℃ for 6h.

6. The method for preparing petroleum resin-modified polypropylene-polyethylene composite material according to any one of claims 3-4, characterized in that, The preparation method also includes an injection molding step, in which the granulated composite material is injection molded into a sample shape required for mechanical property testing or a product for subsequent processing.

7. The method for preparing petroleum resin-modified polypropylene-polyethylene composite material according to claim 6, characterized in that, The injection molding conditions are: temperature 210±20℃, pressure 70 bar, mold cooling time 6.0 seconds; the holding pressure conditions during injection molding are: pressure 40 bar, holding time 5 seconds.

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