PP resin with high impact resistance and preparation method thereof

Abstract

The invention discloses PP (polypropylene) resin with high impact resistance and a preparation method of the PP resin. The PP resin is prepared from the following components in parts by weight: 100 to 150 parts of polypropylene, 0.5 to 5 parts of graphene, 0.1 to 0.8 part of sodium dodecyl benzene sulfonate, 1 to 8 parts of maleic anhydride grafted polypropylene, 0.3 to 0.5 part of polyethylene wax, 0.015 to 0.1 part of coupling agent and 0.1 to 0.3 part of antioxidant. The preparation method comprises the following steps: adding graphene into an aqueous solution containing sodium dodecyl benzene sulfonate, carrying out ultrasonic dispersion treatment to uniformly disperse graphene in the solution, and then filtering and drying to obtain graphene subjected to surface treatment; adding the graphene subjected to surface treatment into PP resin, adding maleic anhydride grafted polypropylene, polyethylene wax, a coupling agent and an antioxidant at the same time, and then stirring and mixing at a high speed to prepare the PP resin with high impact resistance.

Description

Technical Field

[0001] The invention relates to the technical field of PP resin preparation, and in particular to a high-impact resistant PP resin and a preparation method thereof. Background Art

[0002] PP resin (polypropylene) is a thermoplastic resin made by propylene polymerization. It has good mechanical properties, chemical stability and processing properties. It is widely used in packaging, automotive, home appliances, construction and medical fields.

[0003] However, the impact resistance of PP resin is poor, which limits its application in some fields with high requirements for impact resistance. The impact resistance of PP resin refers to the ability of the material to resist damage or deformation when subjected to external impact. At present, the main methods to improve the impact resistance of PP resin are to add elastomeric materials, inorganic rigid particles, etc. However, these methods often lead to a decrease in the rigidity, strength and other properties of PP resin, or a deterioration in processing performance. Therefore, exploring a new synthesis method of high impact modified PP resin is of great practical significance for the widespread application of PP resin. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention aims to provide a PP resin with high impact resistance and a preparation method thereof, so as to solve the problem of low impact resistance of the existing PP resin.

[0005] The present invention firstly provides a PP resin with high impact resistance. The PP resin comprises the following components in parts by weight: 100-150 parts of polypropylene, 0.5-5 parts of graphene, 0.1-0.8 parts of sodium dodecylbenzene sulfonate, 1-8 parts of maleic anhydride grafted polypropylene, 0.3-0.5 parts of polyethylene wax, 0.015-0.1 parts of coupling agent and 0.1-0.3 parts of antioxidant.

[0006] Preferably, the coupling agent is selected from one of γ-aminopropyltriethoxysilane, γ-glycidyloxypropyltrimethoxysilane and γ-methacryloxypropyltrimethoxysilane.

[0007] Preferably, the antioxidant is selected from one or both of hindered phenol antioxidants and phosphite antioxidants.

[0008] The present invention also provides a method for preparing the above-mentioned high impact resistant PP resin, the preparation method comprising the following steps:

[0009] S10, adding graphene to an aqueous solution containing sodium dodecylbenzene sulfonate, performing ultrasonic dispersion treatment to uniformly disperse the graphene in the solution, and then filtering and drying to obtain the surface-treated graphene;

[0010] S20, adding the surface treated graphene to the PP resin, and simultaneously adding maleic anhydride grafted polypropylene, polyethylene wax, a coupling agent and an antioxidant, and then stirring and mixing at a high speed to prepare a PP resin with high impact resistance.

[0011] Preferably, in step S10, sodium dodecylbenzene sulfonate is dissolved in an aqueous solution to obtain a sodium dodecylbenzene sulfonate solution with a concentration of 0.3% to 1%.

[0012] Preferably, in step S10, the mass ratio of graphene to sodium dodecylbenzenesulfonate solution is 1:0.2.

[0013] Preferably, the mass fraction of graphene in step S20 is 0.5% to 3% of the PP resin.

[0014] Preferably, the mass fraction of the polyethylene wax in step S20 is 0.3% to 0.5% of the PP resin.

[0015] Preferably, the mass fraction of the antioxidant in step S20 is 0.1% to 0.5% of the PP resin.

[0016] Preferably, in step S20, the mass fraction of maleic anhydride grafted polypropylene is 1.5 to 3 times that of graphene.

[0017] The invention provides a PP resin with high impact resistance and a preparation method thereof. Sodium dodecylbenzene sulfonate is used to perform surface activity treatment on graphene to improve the compatibility and dispersibility of the graphene. Maleic anhydride grafted polypropylene is added to perform graft modification on the PP resin to enhance the compatibility and adhesion between the PP resin and the graphene. Polyethylene wax and a coupling agent can further improve the combination of the graphene filler and the PP resin, so that the prepared PP resin has high impact resistance. Meanwhile, other important properties of the PP resin, such as rigidity, strength and processing performance, are maintained or improved, so that the PP resin can be applied to some packaging materials requiring high impact resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic flow chart of a method for preparing a high impact PP resin provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "top", "bottom", "top surface", "bottom surface", "inside", "outside", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0021] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If the terms "first", "second", "third" are described, they are only used for the purpose of description and distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following is an explanation of the embodiments of the present invention based on its overall structure.

[0023] A high-impact PP resin comprises the following components in parts by weight: 100-150 parts of polypropylene, 0.5-5 parts of graphene, 0.1-0.8 parts of sodium dodecylbenzene sulfonate, 1-8 parts of maleic anhydride grafted polypropylene, 0.3-0.5 parts of polyethylene wax, 0.015-0.1 parts of coupling agent, and 0.1-0.3 parts of antioxidant.

[0024] Among them, graphene has extremely high strength and modulus. When added to PP resin, it can effectively improve the rigidity of PP resin materials and make it less likely to deform when impacted. Graphene is surface-actively treated with sodium dodecylbenzene sulfonate, which is an anionic surfactant containing hydrophilic sulfonic acid groups and hydrophobic alkylphenyl groups in its molecular structure. When it comes into contact with graphene, the sulfonic acid groups are adsorbed on the graphene surface through electrostatic effects, while the alkylphenyl groups extend into the surrounding solvent, changing the graphene surface from poor hydrophilicity to good hydrophilicity and steric hindrance, thereby effectively reducing the van der Waals force between graphene sheets, preventing graphene from agglomerating, and enabling it to be more evenly dispersed. After being treated with sodium dodecylbenzene sulfonate, the properties of the graphene surface are changed, and the interfacial compatibility with the matrix material is significantly improved, thereby enhancing the bonding force between graphene and the matrix material, enabling graphene to better exert its performance advantages, more effectively transfer stress in PP resin materials, and enhance mechanical properties. Good dispersibility and compatibility allow graphene to be more evenly distributed in the matrix material, reducing processing difficulties caused by agglomeration or poor compatibility, and thus enabling graphene to be evenly dispersed in PP resin, giving PP resin good impact strength.

[0025] On the other hand, the use of maleic anhydride grafted polypropylene can produce sticky groups on the surface of PP resin, improve the compatibility and adhesion with graphene, thereby enhancing stress transfer and improving the impact resistance of PP resin.

[0026] Polyethylene wax helps graphene filler to be evenly dispersed in the PP resin matrix, making the filler more evenly distributed in the PP resin. The coupling agent can improve the compatibility between the PP resin matrix and graphene, and improve the dispersibility of graphene filler in the PP resin.

[0027] As for antioxidants, oxidation of PP resin often leads to a decrease in its mechanical properties, making the PP resin with good toughness become brittle and hard, and the tensile strength, impact strength and other indicators deteriorate. Antioxidants can keep good mechanical properties of PP resin during processing and long-term use by inhibiting oxidation.

[0028] In a preferred embodiment, the coupling agent is selected from one of γ-aminopropyltriethoxysilane, γ-glycidoxypropyltrimethoxysilane and γ-methacryloxypropyltrimethoxysilane.

[0029] In a more preferred embodiment, the coupling agent is selected from γ-aminopropyltriethoxysilane.

[0030] In a preferred embodiment, the antioxidant is selected from one or both of hindered phenol antioxidants and phosphite antioxidants.

[0031] In a more preferred embodiment, the antioxidant is selected from two types: hindered phenol antioxidants and phosphite antioxidants.

[0032] A method for preparing the above-mentioned high impact PP resin, the preparation method comprising the following steps:

[0033] S10, adding graphene to an aqueous solution containing sodium dodecylbenzene sulfonate, performing ultrasonic dispersion treatment to uniformly disperse the graphene in the solution, and then filtering and drying to obtain surface-treated graphene.

[0034] In a specific embodiment, graphene is added to an aqueous solution containing sodium dodecylbenzene sulfonate, and ultrasonically dispersed for 1 to 2 hours to uniformly disperse the graphene in the solution, and then the surface-treated graphene is obtained by filtering and drying.

[0035] In a preferred embodiment, in step S10, sodium dodecylbenzene sulfonate is dissolved in an aqueous solution to obtain a sodium dodecylbenzene sulfonate solution with a concentration of 0.3% to 1%. The graphene is subjected to surface activation treatment using the sodium dodecylbenzene sulfonate solution with a concentration of 0.3% to 1%.

[0036] In a more preferred embodiment, a sodium dodecylbenzene sulfonate solution with a concentration of 0.3% is selected.

[0037] In a preferred embodiment, the mass ratio of graphene to sodium dodecylbenzenesulfonate solution in step S10 is 1:0.2.

[0038] S20, adding the surface treated graphene to the PP resin, and simultaneously adding maleic anhydride grafted polypropylene, polyethylene wax, a coupling agent and an antioxidant, and then stirring and mixing at a high speed to prepare a PP resin with high impact resistance.

[0039] In a specific embodiment, the surface treated graphene is added to the PP resin, and an appropriate amount of maleic anhydride grafted polypropylene, polyethylene wax, coupling agent, hindered phenol antioxidant, and phosphite antioxidant are added at the same time, and mixed by a high-speed mixer at a mixing speed of 1000-1400r / min and a mixing time of 15-30min, so that the graphene and the additives are evenly dispersed in the PP resin. Then the mixed material is added to a twin-screw extruder for extrusion molding, and the extrusion temperature of the twin-screw extruder is 170°C-210°C and the screw speed is 400r / min. The extruded material is water-cooled, dried, and pelletized to obtain graphene-modified PP resin particles.

[0040] In a preferred embodiment, the mass fraction of graphene in step S20 is 0.5% to 3% of the PP resin.

[0041] In a preferred embodiment, the mass fraction of the polyethylene wax in step S20 is 0.3% to 0.5% of the PP resin.

[0042] In a preferred embodiment, the mass fraction of the antioxidant in step S20 is 0.1%-0.5% of the PP resin.

[0043] In a preferred embodiment, the mass fraction of maleic anhydride grafted polypropylene in step S20 is 1.5 to 3 times that of graphene.

[0044] Example 1

[0045] Example 1 provides a high impact resistant PP resin and a preparation method thereof, as follows:

[0046] A high impact PP resin comprises the following components in parts by weight:

[0047] Polypropylene 100 parts;

[0048] 0.5 parts of graphene;

[0049] 0.1 part of sodium dodecylbenzenesulfonate;

[0050] Maleic anhydride grafted polypropylene 1 part;

[0051] 0.3 parts of polyethylene wax;

[0052] Coupling agent (γ-aminopropyltriethoxysilane (KH-550)) 0.015 parts;

[0053] Hindered phenol antioxidant (antioxidant 1010) 0.1 part;

[0054] 0.1 part of phosphite antioxidant (Antioxidant 168).

[0055] The preparation method of a high impact resistant PP resin in the above embodiment 1 is as follows:

[0056] (1) Graphene surface treatment

[0057] Add 0.1 parts of sodium dodecylbenzene sulfonate to an appropriate amount of water and stir evenly to prepare a sodium dodecylbenzene sulfonate solution with a concentration of 0.3%. Add 0.5 parts of graphene powder to the sodium dodecylbenzene sulfonate solution, the mass ratio of graphene to sodium dodecylbenzene sulfonate solution is 1:0.2, and then ultrasonically disperse for 1 hour. Then, the surface-treated graphene is obtained by filtering and drying to improve the dispersibility and compatibility of graphene in PP resin.

[0058] (2) Raw material mixing

[0059] 100 parts of polypropylene, 1 part of maleic anhydride grafted polypropylene, 0.3 parts of polyethylene wax, 0.015 parts of KH-550, 0.1 parts of antioxidant 1010, and 0.1 parts of antioxidant 168 were added into a high-speed mixer, and then the surface-treated graphene was added, and mixed at a speed of 1000 r / min for 15 minutes.

[0060] (3) Extrusion molding

[0061] The mixed materials are added to a twin-screw extruder for extrusion molding, the extrusion temperature of the twin-screw extruder is 170°C to 210°C, and the screw speed is 400r / min. The extruded materials are water-cooled, dried, and pelletized to obtain graphene-modified PP resin particles.

[0062] Example 2

[0063] Example 2 provides a high impact resistant PP resin and a preparation method thereof, as follows:

[0064] A high impact PP resin comprises the following components in parts by weight:

[0065] Polypropylene 100 parts;

[0066] 1.5 parts of graphene;

[0067] 0.3 parts of sodium dodecylbenzene sulfonate;

[0068] Maleic anhydride grafted polypropylene 3 parts;

[0069] 0.3 parts of polyethylene wax;

[0070] Coupling agent (γ-aminopropyltriethoxysilane (KH-550)) 0.045 parts;

[0071] Hindered phenol antioxidant (antioxidant 1010) 0.1 part;

[0072] 0.1 part of phosphite antioxidant (Antioxidant 168).

[0073] The preparation method of a high impact resistant PP resin in the above embodiment 2 is as follows:

[0074] (1) Graphene surface treatment

[0075] Add 0.3 parts of sodium dodecylbenzene sulfonate to an appropriate amount of water and stir evenly to prepare a sodium dodecylbenzene sulfonate solution with a concentration of 0.3%. Add 1.5 parts of graphene powder to the sodium dodecylbenzene sulfonate solution, the mass ratio of graphene to the sodium dodecylbenzene sulfonate solution is 1:0.2, and ultrasonically disperse for 1.5 hours. Then, the surface-treated graphene is obtained by filtering and drying to improve the dispersibility and compatibility of graphene in PP resin.

[0076] (2) Raw material mixing

[0077] 100 parts of polypropylene, 3 parts of maleic anhydride grafted polypropylene, 0.3 parts of polyethylene wax, 0.045 parts of KH-550, 0.1 parts of antioxidant 1010, and 0.1 parts of antioxidant 168 were added into a high-speed mixer, and then the surface-treated graphene was added, and mixed at a speed of 1200 r / min for 20 minutes.

[0078] (3) Extrusion molding

[0079] The mixed materials are added to a twin-screw extruder for extrusion molding, the extrusion temperature of the twin-screw extruder is 170°C to 210°C, and the screw speed is 400r / min. The extruded materials are water-cooled, dried, and pelletized to obtain graphene-modified PP resin particles.

[0080] Example 3

[0081] Example 3 provides a high impact resistant PP resin and a preparation method thereof, as follows:

[0082] A high impact PP resin comprises the following components in parts by weight:

[0083] Polypropylene 100 parts;

[0084] Graphene 3 parts;

[0085] 0.6 parts of sodium dodecylbenzene sulfonate;

[0086] Maleic anhydride grafted polypropylene 6 parts;

[0087] 0.3 parts of polyethylene wax;

[0088] Coupling agent (γ-aminopropyltriethoxysilane (KH-550)) 0.09 parts;

[0089] Hindered phenol antioxidant (antioxidant 1010) 0.1 part;

[0090] 0.1 part of phosphite antioxidant (Antioxidant 168).

[0091] The preparation method of a high impact resistant PP resin in the above embodiment 3 is as follows:

[0092] (1) Graphene surface treatment

[0093] Add 0.6 parts of sodium dodecylbenzene sulfonate to an appropriate amount of water and stir evenly to prepare a sodium dodecylbenzene sulfonate solution with a concentration of 0.3%. Add 3 parts of graphene powder to the sodium dodecylbenzene sulfonate solution, the mass ratio of graphene to the sodium dodecylbenzene sulfonate solution is 1:0.2, and ultrasonically disperse for 2 hours. Then, the surface-treated graphene is obtained by filtering and drying to improve the dispersibility and compatibility of graphene in PP resin.

[0094] (2) Raw material mixing

[0095] 100 parts of polypropylene, 6 parts of maleic anhydride grafted polypropylene, 0.3 parts of polyethylene wax, 0.09 parts of KH-550, 0.1 parts of antioxidant 1010, and 0.1 parts of antioxidant 168 were added into a high-speed mixer, and then the surface-treated graphene was added, and mixed at a speed of 1400 r / min for 30 minutes.

[0096] (3) Extrusion molding

[0097] The mixed materials are added to a twin-screw extruder for extrusion molding, the extrusion temperature of the twin-screw extruder is 170°C to 210°C, and the screw speed is 400r / min. The extruded materials are water-cooled, dried, and pelletized to obtain graphene-modified PP resin particles.

[0098] Comparative Example 1

[0099] Comparative Example 1 is the control group of Example 1. The graphene added in Comparative Example 1 is not subjected to surface activity treatment, and the remaining components and preparation process are the same as those of Example 1.

[0100] Comparative Example 2

[0101] Comparative Example 2 is the control group of Example 3. The graphene added in Comparative Example 3 is not subjected to surface activity treatment, and the remaining components and preparation process are the same as those of Example 3.

[0102] Comparative Example 3

[0103] Comparative Example 3 is the control group of Example 1, that is, no graphene and sodium dodecylbenzene sulfonate are added to Comparative Example 3, and the remaining components and preparation process are the same as those of Example 1.

[0104] The PP resin particle samples obtained in Examples 1-3 and the corresponding products produced from the PP resin particle samples in Comparative Examples 1-3 were subjected to product performance tests. The test items and test instruments during the test are as follows:

[0105] (1) Izod notched impact strength: Izod impact testing machine.

[0106] (2) Tensile strength: universal testing machine.

[0107] (3) Flexural modulus: universal testing machine.

[0108] The results of the performance tests of the PP resins obtained in Examples 1-3 and Comparative Examples 1-3 are shown in Table 1 below:

[0109] sample <![CDATA[Izod impact strength of cantilever beam (KJ / m 2 )]]> Tensile strength(MPa) Flexural modulus (MPa) Example 1 4.41 38.17 1978 Comparative Example 1 3.58 31.48 1774 Comparative Example 3 2.96 23.59 1348 Example 2 6.59 49.15 2385 Example 3 9.84 57.82 2973 Comparative Example 2 7.73 50.73 2819

[0110] Table 1

[0111] Referring to Table 1 above, it can be seen from the sample test data in Example 1, Example 2 and Example 3 that with the increase of graphene content, the Izod notched impact strength, tensile strength and flexural modulus of the PP resin are significantly improved.

[0112] Referring to Table 1 above, it can be seen from the sample test data in Example 1 and Comparative Example 3 that the PP resin prepared in Comparative Example 3 without adding the graphene treated with surfactant has lower Izod notched impact strength, tensile strength and flexural modulus than the PP resin prepared after adding the graphene treated with surfactant in Example 1.

[0113] Referring to Table 1 above, it can be seen from the sample test data in Example 1 and Comparative Example 1 that the PP resin prepared by adding graphene without surface active treatment in Comparative Example 1 has lower Izod notched impact strength, tensile strength and flexural modulus than the PP resin prepared by adding graphene with surface active treatment in Example 1.

[0114] Referring to Table 1 above, it can be seen from the sample test data in Example 3 and Comparative Example 2 that the PP resin prepared by adding graphene without surface active treatment in Comparative Example 2 has lower Izod notched impact strength, tensile strength and flexural modulus than the PP resin prepared by adding graphene with surface active treatment in Example 3.

[0115] It can be seen from Table 1 above that the PP resin provided in the present invention can improve the compatibility and dispersibility of graphene after surface modification of graphene, so that the graphene can be more evenly dispersed and more strongly bonded to the PP resin. At the same time, as the amount of graphene filler added gradually increases, the PP resin exhibits higher impact resistance.

[0116] In summary, the present invention provides a PP resin with high impact resistance and a preparation method thereof. Sodium dodecylbenzene sulfonate is used to perform surface activity treatment on graphene to improve the compatibility and dispersibility of graphene. Maleic anhydride grafted polypropylene is added to graft-modify the PP resin to enhance the compatibility and adhesion between the PP resin and graphene. Polyethylene wax and a coupling agent can further improve the combination of graphene filler and PP resin, so that the prepared PP resin has high impact resistance. At the same time, other important properties of the PP resin, such as rigidity, strength and processing performance, are maintained or improved, so that the PP resin can be applied to some packaging materials requiring higher impact resistance.

[0117] The above is only a specific implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A high impact resistant PP resin, characterized in that: The PP resin includes the following components in parts by weight: 100-150 parts of polypropylene, 0.5-5 parts of graphene, 0.1-0.8 parts of sodium dodecylbenzene sulfonate, 1-8 parts of maleic anhydride grafted polypropylene, 0.3-0.5 parts of polyethylene wax, 0.015-0.1 parts of coupling agent, and 0.1-0.3 parts of antioxidant.

2. A high impact resistant PP resin according to claim 1, characterized in that: The coupling agent is selected from one of γ-aminopropyltriethoxysilane, γ-glycidyloxypropyltrimethoxysilane and γ-methacryloxypropyltrimethoxysilane.

3. The high impact resistant PP resin according to claim 1, characterized in that: The antioxidant is selected from one or both of hindered phenol antioxidants and phosphite antioxidants.

4. A method for preparing a high impact PP resin as claimed in any one of claims 1 to 3, characterized in that: The preparation method comprises the following steps: S10, adding graphene to an aqueous solution containing sodium dodecylbenzene sulfonate, performing ultrasonic dispersion treatment to uniformly disperse the graphene in the solution, and then filtering and drying to obtain the surface-treated graphene; S20, adding the surface treated graphene to the PP resin, and simultaneously adding maleic anhydride grafted polypropylene, polyethylene wax, a coupling agent and an antioxidant, and then stirring and mixing at a high speed to prepare a PP resin with high impact resistance.

5. The method for preparing a high impact resistant PP resin according to claim 4, characterized in that: In the step S10, sodium dodecylbenzene sulfonate is dissolved in an aqueous solution to obtain a sodium dodecylbenzene sulfonate solution with a concentration of 0.3% to 1%.

6. The method for preparing a high impact resistant PP resin according to claim 5, characterized in that: In the step S10, the mass ratio of graphene to sodium dodecylbenzene sulfonate solution is 1:0.

2.

7. The method for preparing a high impact resistant PP resin according to claim 4, characterized in that: The mass fraction of graphene in step S20 is 0.5% to 3% of the PP resin.

8. The method for preparing a high impact resistant PP resin according to claim 4, characterized in that: The mass fraction of the polyethylene wax in step S20 is 0.3% to 0.5% of the PP resin.

9. The method for preparing a high impact resistant PP resin according to claim 4, characterized in that: The mass fraction of the antioxidant in step S20 is 0.1% to 0.5% of the PP resin.

10. The method for preparing a high impact resistant PP resin according to claim 4, characterized in that: In the step S20, the mass fraction of maleic anhydride grafted polypropylene is 1.5 to 3 times that of graphene.

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