Permanent anti-static polypropylene composite material with low-temperature impact resistance and high-temperature deformation resistance and preparation method of permanent anti-static polypropylene composite material

Abstract

The invention discloses a permanent antistatic polypropylene composite material with low-temperature impact resistance and high-temperature deformation resistance, and relates to the technical field of polypropylene composite materials. The composite material comprises the following components in percentage by mass: 50-80% of polypropylene, 0-20% of glass fiber, 0-10% of chopped aramid fiber, 0-8% of carbon fiber, 3-8% of a compatilizer, 5-20% of a special flexibilizer, 0.5-1% of a lubricant, 5-10% of a permanent antistatic agent, 0.1-1% of a coupling agent, 0.1-2% of other auxiliaries and 3-5% of green master batch. According to the polypropylene composite material provided by the invention, 5-10% of the permanent antistatic agent is directly added into the raw materials, and 0-8% of the carbon fibers are added, so that the prepared material directly has a good antistatic effect, and after the material is subsequently processed into an ammunition packaging box, an antistatic coating does not need to be additionally sprayed; the impact damage resistance of the material at a low temperature and the thermal deformation resistance of the material at a high temperature can be further improved while an excellent antistatic effect is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of polypropylene composite materials, and more particularly to a low-temperature impact-resistant and high-temperature deformation-resistant permanent antistatic polypropylene composite material and a preparation method thereof. Background Art

[0002] As a key component of weapon and equipment logistics, ammunition packaging boxes must stably protect ammunition in complex environments (such as polar cold, tropical heat, and plateau aridity). The material properties of these boxes directly impact the storage life and transportation safety of ammunition. Polypropylene (PP) is a preferred base material for lightweight packaging boxes due to its low density, ease of processing, and manageable costs.

[0003] Although some polypropylene composite materials with good low-temperature and high-temperature deformation resistance are disclosed in the prior art, their deformation resistance needs to be further improved. In addition, polypropylene composite materials in the prior art generally do not have antistatic properties. Only after the product is processed, an adsorption film is formed on the product surface by spraying antistatic coating, etc. to achieve the effect of reducing surface resistance and static electricity. The operation has problems such as being environmentally unfriendly, time-consuming, labor-intensive, and costly. Summary of the Invention

[0004] In light of this, the primary objective of the present invention is to provide a permanent antistatic polypropylene composite material that is resistant to low-temperature impact and high-temperature deformation. This polypropylene composite material can be processed into ammunition packaging boxes. While exhibiting excellent antistatic properties, it also further enhances the material's resistance to low-temperature impact damage and high-temperature thermal deformation. The resulting packaging boxes are also colored military green, providing a degree of concealment and camouflage, meeting practical needs.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] A low-temperature impact-resistant and high-temperature deformation-resistant permanent antistatic polypropylene composite material, comprising the following components in percentage by mass:

[0007] Polypropylene 50-80%, glass fiber 0-20%, chopped aramid fiber 0-10%, carbon fiber 0-8%, compatibilizer 3-8%, special toughening agent 5-20%, lubricant 0.5-1%, permanent antistatic agent 5-10%, coupling agent 0.1-1%, other additives 0.1-2%, green masterbatch 3-5%;

[0008] Wherein, the mass percentage of each of the glass fiber, the chopped aramid fiber and the carbon fiber is not 0; the special toughening agent is one or two of propylene-ethylene copolymer, ethylene-hexene copolymer, ethylene-butene copolymer and ethylene-propylene-diene terpolymer, the length of the chopped aramid fiber is 2-15 mm; and the compatibilizer is polyethylene grafted maleic anhydride or polypropylene grafted maleic anhydride.

[0009] Furthermore, the coupling agent is a silane coupling agent, such as silane coupling agent KH-550, KH-570, KH-792.

[0010] Furthermore, the permanent antistatic agent is a hydrophilic antistatic agent.

[0011] Furthermore, the hydrophilic antistatic agent includes one or more of sodium dodecylbenzenesulfonate, 1-ethyl-3-methylimidazolium ethyl sulfate, and trimethylhydroxyethylammonium methyl sulfate.

[0012] In the present invention, by adopting the above-mentioned hydrophilic antistatic agent, the polar groups in its molecules can adsorb environmental moisture, form a continuous water molecule layer on the surface of the material, ionize mobile ions (H+, OH- or organic ions), and form an ion conductive channel; although the carbon fiber itself has high conductivity, it is easily wrapped by polypropylene resin in the composite material, which easily leads to discontinuous conductive paths; and the surface water layer formed by the hydrophilic antistatic agent can bridge the exposed end points of the carbon fiber, constructing a "carbon fiber-water film" dual-path electrostatic dissipation network, significantly improving the antistatic properties.

[0013] Furthermore, the carbon fibers include short-cut carbon fibers with a length of 0.5-2 mm and long-cut carbon fibers with a length of 8-15 mm.

[0014] Furthermore, the chopped carbon fibers account for 70%-95% of the total carbon fibers by mass.

[0015] In the present invention, short-cut carbon fibers are mainly used, which can reduce the processing difficulty. They have better dispersion in the polypropylene matrix and are more suitable for molding processes such as injection molding and extrusion. The addition of a small amount of long-cut carbon fibers can retain the reinforcing advantages of long fibers and further improve the strength of the composite material.

[0016] Furthermore, the carbon fiber is a modified carbon fiber having a surface containing hydroxyl groups or carboxyl groups after grafting modification.

[0017] In the present invention, by appropriately modifying the carbon fibers, on the one hand, the binding with the compatibilizer polyethylene grafted maleic anhydride or polypropylene grafted maleic anhydride can be enhanced, reducing the interface defects between the carbon fibers and the non-polar polypropylene and avoiding the loss of mechanical properties; at the same time, the binding with the hydrophilic antistatic agent can be enhanced; that is, the polar groups such as carboxyl or hydroxyl groups contained on the carbon fiber surface bind to the polar ends of the hydrophilic antistatic agent through hydrogen bonds or electrostatic interactions, forming a "carbon fiber-antistatic agent" interface composite layer. This structure not only enhances the directional adsorption of the antistatic agent on the carbon fiber surface, improving the antistatic stability of the interface; on the other hand, it also reduces the migration of the antistatic agent into the matrix, extending the surface antistatic durability.

[0018] Furthermore, the preparation method of the modified carbon fiber includes:

[0019] S1. Soak the carbon fiber in a 5-10% nitric acid aqueous solution for 30-60 minutes, filter, wash, and dry;

[0020] S2. Soak the carbon fiber treated in step S1 in an ethanol solution of a coupling agent for 2-4 hours, filter, and dry to obtain a modified carbon fiber;

[0021] Wherein, the coupling agent is a silane coupling agent, such as KH-550, KH-570, KH-792, etc.

[0022] In the present invention, polar groups such as carboxyl and / or hydroxyl groups are introduced into the carbon fiber surface in the above manner. At the same time, the carbon fiber surface after appropriate modification can produce micro-etching to form nano-scale grooves or protrusions. This rough surface can further increase the connection strength with the polypropylene matrix.

[0023] Furthermore, the lubricant is at least one of stearate, silicone, and fatty acid amide.

[0024] Furthermore, the stearate is calcium stearate or zinc stearate, the silicone is a high molecular weight siloxane, and the fatty acid amide is oleamide or ethylene bisstearamide.

[0025] Furthermore, in the present invention, the polypropylene includes high crystalline copolymer polypropylene and / or high impact copolymer polypropylene.

[0026] Furthermore, the diameter of the long glass fiber is 8 to 20 μm; and the chopped aramid fiber is aramid 1313 and / or aramid 1414.

[0027] Furthermore, the other additives include an antioxidant and a light stabilizer; the antioxidant is a hindered phenol antioxidant and a phosphate antioxidant in a ratio of 2:1. The light stabilizer is a high molecular weight hindered amine light stabilizer that can function for a long time in a weak acid environment.

[0028] The present invention also aims to provide a method for preparing any of the above-mentioned low-temperature impact-resistant and high-temperature deformation-resistant permanent antistatic polypropylene composite materials, comprising the following steps:

[0029] (1) Weigh each raw material according to the formula ratio;

[0030] (2) Polypropylene, a compatibilizer, a special toughening agent, a lubricant, a permanent antistatic agent, other additives, and a green masterbatch are uniformly mixed to obtain material A;

[0031] (3) After pre-treating the carbon fiber and the coupling agent, glass fiber and chopped aramid fiber are added and mixed to obtain material B;

[0032] (4) Material A is fed through the main feeding port of a twin-screw extruder, and material B is fed through the side feeding port, and the mixture is melt-blended by the twin-screw extruder. The extruded material strips are granulated by a pelletizer to prepare a permanent anti-static polypropylene composite material that is resistant to low-temperature impact and high-temperature deformation.

[0033] Compared with the prior art, the present invention has the following advantages:

[0034] The polypropylene composite material provided by the present invention directly adds 5-10% of a permanent antistatic agent to the raw material, and simultaneously adds 0-8% of carbon fiber, so that the prepared material directly has a good antistatic effect. After being subsequently processed into ammunition packaging boxes, there is no need for additional spraying of antistatic coating. While achieving excellent antistatic effects, the material can also further improve its impact damage resistance at low temperatures and heat deformation resistance at high temperatures. DETAILED DESCRIPTION

[0035] The following description sets forth numerous specific details to facilitate a thorough understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific implementations disclosed below.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0037] Unless otherwise specified, the materials and reagents used in the present invention can be obtained from commercial products in the art.

[0038] Example 1

[0039] A low-temperature impact-resistant and high-temperature deformation-resistant permanent antistatic polypropylene composite material, comprising the following components in percentage by mass:

[0040] High crystalline polypropylene 58.8%, glass fiber 8%, chopped aramid fiber (aramid 1313) 5%, carbon fiber 5%, polyethylene grafted maleic anhydride 5%, propylene-ethylene copolymer 6%, calcium stearate 0.5%, sodium dodecylbenzene sulfonate 7%, antioxidant 0.5%, light stabilizer 0.2%, silane coupling agent (KH-550) 1%, green masterbatch 3%.

[0041] The carbon fiber includes 80% short-cut carbon fiber and 20% long-cut carbon fiber.

[0042] The preparation method of polypropylene composite material is as follows:

[0043] (1) Weigh the above raw materials according to the ratio;

[0044] (2) High crystalline polypropylene, polyethylene grafted maleic anhydride, propylene-ethylene copolymer, calcium stearate, sodium dodecylbenzene sulfonate, antioxidant, light stabilizer and green masterbatch are uniformly mixed to obtain material A;

[0045] (3) The carbon fiber was first soaked in a 5% nitric acid aqueous solution for 40 minutes, filtered, dried, and then soaked in an ethanol solution of coupling agent KH-550 for 2 hours, filtered, washed, and dried to obtain pretreated carbon fiber; glass fiber and chopped aramid fiber were added and mixed to obtain material B;

[0046] (4) Material A is fed through the main feeding port of a twin-screw extruder, and material B is fed through the side feeding port, and the mixture is melt-blended by the twin-screw extruder. The extruded material strips are granulated by a pelletizer to prepare a permanent anti-static polypropylene composite material that is resistant to low-temperature impact and high-temperature deformation.

[0047] Example 2

[0048] A low-temperature impact-resistant and high-temperature deformation-resistant permanent antistatic polypropylene composite material, comprising the following components in percentage by mass:

[0049] High crystalline polypropylene 58.8%, glass fiber 5%, chopped aramid fiber (aramid 1414) 8%, carbon fiber 5%, polypropylene grafted maleic anhydride 5%, ethylene-hexene copolymer 6%, silicone 0.5%, sodium dodecylbenzene sulfonate 7%, antioxidant 0.5%, light stabilizer 0.2%, silane coupling agent (KH-570) 1%, green masterbatch 3%.

[0050] The carbon fiber includes 80% short-cut carbon fiber and 20% long-cut carbon fiber.

[0051] The preparation method of polypropylene composite material is as follows:

[0052] (1) Weigh the above raw materials according to the ratio;

[0053] (2) Polypropylene, polypropylene grafted maleic anhydride, ethylene-hexene copolymer, calcium stearate, sodium dodecylbenzene sulfonate, antioxidant, light stabilizer and green masterbatch are uniformly mixed to obtain material A;

[0054] (3) The carbon fiber was first soaked in a 5% nitric acid aqueous solution for 40 minutes, filtered, dried, and then soaked in an ethanol solution of coupling agent KH-550 for 2 hours, filtered, washed, and dried to obtain pretreated carbon fiber; glass fiber and chopped aramid fiber were added and mixed to obtain material B;

[0055] (4) Material A is fed through the main feeding port of a twin-screw extruder, and material B is fed through the side feeding port, and the mixture is melt-blended by the twin-screw extruder. The extruded material strips are granulated by a pelletizer to prepare a permanent anti-static polypropylene composite material that is resistant to low-temperature impact and high-temperature deformation.

[0056] Example 3

[0057] A low-temperature impact-resistant and high-temperature deformation-resistant permanent antistatic polypropylene composite material, comprising the following components in percentage by mass:

[0058] High crystalline polypropylene 58.8%, glass fiber 9%, chopped aramid fiber (aramid 1313) 5%, carbon fiber 5%, polyethylene grafted maleic anhydride 5%, propylene-ethylene copolymer 6%, zinc stearate 0.5%, sodium dodecylbenzene sulfonate 7%, antioxidant 0.5, light stabilizer 0.2, green masterbatch 3%.

[0059] The carbon fiber includes 80% short-cut carbon fiber and 20% long-cut carbon fiber.

[0060] The preparation method of polypropylene composite material is as follows:

[0061] (1) Weigh the above raw materials according to the ratio;

[0062] (2) Polypropylene, a compatibilizer, a special toughening agent, a lubricant, a permanent antistatic agent, an antioxidant, a light stabilizer, and a green masterbatch are uniformly mixed to obtain material A;

[0063] (3) mixing carbon fiber, glass fiber and chopped aramid fiber to obtain material B;

[0064] (4) Material A is fed through the main feeding port of a twin-screw extruder, and material B is fed through the side feeding port, and the mixture is melt-blended by the twin-screw extruder. The extruded material strips are granulated by a pelletizer to prepare a permanent anti-static polypropylene composite material that is resistant to low-temperature impact and high-temperature deformation.

[0065] Example 4

[0066] A low-temperature impact-resistant and high-temperature deformation-resistant permanent antistatic polypropylene composite material, comprising the following components in percentage by mass:

[0067] High crystalline polypropylene 58.8%, glass fiber 8%, chopped aramid fiber (aramid 1313) 5%, carbon fiber 5%, polyethylene grafted maleic anhydride 5%, propylene-ethylene copolymer 6%, oleamide 0.5%, sodium dodecylbenzene sulfonate 7%, antioxidant 0.5%, light stabilizer 0.2%, silane coupling agent (KH-550) 1%, green masterbatch 3%.

[0068] Among them, the carbon fibers are all chopped carbon fibers.

[0069] The preparation method of polypropylene composite material is as follows:

[0070] (1) Weigh the above raw materials according to the ratio;

[0071] (2) High crystalline polypropylene, polyethylene grafted maleic anhydride, propylene-ethylene copolymer, calcium stearate, sodium dodecylbenzene sulfonate, antioxidant, light stabilizer and green masterbatch are uniformly mixed to obtain material A;

[0072] (3) The carbon fiber was first soaked in a 5% nitric acid aqueous solution for 40 minutes, filtered, dried, and then soaked in an ethanol solution of coupling agent KH-550 for 2 hours, filtered, washed, and dried to obtain pretreated carbon fiber; glass fiber and chopped aramid fiber were added and mixed to obtain material B;

[0073] (4) Material A is fed through the main feeding port of a twin-screw extruder, and material B is fed through the side feeding port, and the mixture is melt-blended by the twin-screw extruder. The extruded material strips are granulated by a pelletizer to prepare a permanent anti-static polypropylene composite material that is resistant to low-temperature impact and high-temperature deformation.

[0074] Example 5

[0075] A low-temperature impact-resistant and high-temperature deformation-resistant permanent antistatic polypropylene composite material, comprising the following components in percentage by mass:

[0076] High crystalline polypropylene 58.8%, glass fiber 10%, chopped aramid fiber (aramid 1313) 8%, polyethylene grafted maleic anhydride 5%, propylene-ethylene copolymer 6%, calcium stearate 0.5%, sodium dodecylbenzene sulfonate 7%, antioxidant 0.5%, light stabilizer 0.2%, silane coupling agent (KH-550) 1%, green masterbatch 3%.

[0077] The preparation method of polypropylene composite material is as follows:

[0078] (1) Weigh the above raw materials according to the ratio;

[0079] (2) High crystalline polypropylene, polyethylene grafted maleic anhydride, propylene-ethylene copolymer, calcium stearate, sodium dodecylbenzene sulfonate, antioxidant, light stabilizer and green masterbatch are uniformly mixed to obtain material A;

[0080] (3) mixing glass fiber, chopped aramid fiber and coupling agent to obtain material B;

[0081] (4) Material A is fed through the main feeding port of a twin-screw extruder, and material B is fed through the side feeding port, and the mixture is melt-blended by the twin-screw extruder. The extruded material strips are granulated by a pelletizer to prepare a permanent anti-static polypropylene composite material that is resistant to low-temperature impact and high-temperature deformation.

[0082] Example 6

[0083] A low-temperature impact-resistant and high-temperature deformation-resistant permanent antistatic polypropylene composite material, comprising the following components in percentage by mass:

[0084] High crystalline polypropylene 60.6%, glass fiber 10%, chopped aramid fiber (aramid 1313) 8%, carbon fiber 5%, polyethylene grafted maleic anhydride 5%, propylene-ethylene copolymer 6%, calcium stearate 0.5%, sodium dodecylbenzene sulfonate 0.2%, antioxidant 0.5%, light stabilizer 0.2%, silane coupling agent (KH-550) 1%, green masterbatch 3%.

[0085] The carbon fiber includes 80% short-cut carbon fiber and 20% long-cut carbon fiber.

[0086] The preparation method of polypropylene composite material is as follows:

[0087] (1) Weigh the above raw materials according to the ratio;

[0088] (2) High crystalline polypropylene, polyethylene grafted maleic anhydride, propylene-ethylene copolymer, calcium stearate, sodium dodecylbenzene sulfonate, antioxidant, light stabilizer and green masterbatch are uniformly mixed to obtain material A;

[0089] (3) The carbon fiber was first soaked in a 5% nitric acid aqueous solution for 40 minutes, filtered, dried, and then soaked in an ethanol solution of coupling agent KH-550 for 2 hours, filtered, washed, and dried to obtain pretreated carbon fiber; glass fiber and chopped aramid fiber were added and mixed to obtain material B;

[0090] (4) Material A is fed through the main feeding port of a twin-screw extruder, and material B is fed through the side feeding port, and the mixture is melt-blended by the twin-screw extruder. The extruded material strips are granulated by a pelletizer to prepare a permanent anti-static polypropylene composite material that is resistant to low-temperature impact and high-temperature deformation.

[0091] Example 7

[0092] A low-temperature impact-resistant and high-temperature deformation-resistant permanent antistatic polypropylene composite material, comprising the following components in percentage by mass:

[0093] High crystalline polypropylene 60.6%, glass fiber 10%, chopped aramid fiber (aramid 1313) 8%, carbon fiber 8%, polyethylene grafted maleic anhydride 5%, propylene-ethylene copolymer 6%, calcium stearate 0.5%, sodium dodecylbenzene sulfonate 0.2%, antioxidant 0.5%, light stabilizer 0.2%, silane coupling agent (KH-550) 1%.

[0094] The carbon fiber includes 80% short-cut carbon fiber and 20% long-cut carbon fiber.

[0095] The preparation method of polypropylene composite material is as follows:

[0096] (1) Weigh the above raw materials according to the ratio;

[0097] (2) mixing high crystalline polypropylene, polyethylene grafted maleic anhydride, propylene-ethylene copolymer, calcium stearate, sodium dodecylbenzenesulfonate, an antioxidant, and a light stabilizer to obtain material A;

[0098] (3) The carbon fiber was first soaked in a 5% nitric acid aqueous solution for 40 minutes, filtered, dried, and then soaked in an ethanol solution of coupling agent KH-550 for 2 hours, filtered, washed, and dried to obtain pretreated carbon fiber; glass fiber and chopped aramid fiber were added and mixed to obtain material B;

[0099] (4) Material A is fed through the main feeding port of a twin-screw extruder, and material B is fed through the side feeding port, and the mixture is melt-blended by the twin-screw extruder. The extruded material strips are granulated by a pelletizer to prepare a permanent anti-static polypropylene composite material that is resistant to low-temperature impact and high-temperature deformation.

[0100] The polypropylene composite materials prepared in Examples 1-7 were respectively used to prepare standard ISO specimens using an injection molding machine for testing. The test results are shown in the following table:

[0101]

[0102]

[0103] As can be seen from the above table, in Example 3, since the carbon fiber has not been modified, on the one hand, its antistatic performance will be reduced compared with Examples 1 and 2, and the mechanical properties of its products will also be reduced. In addition, the untreated carbon fiber also has the problem of coloring difficulty and uneven coloring, which leads to uneven extension of the processed splines, and after subsequent processing into packaging products, it is easy to cause unqualified appearance; in Example 4, all short-cut carbon fibers are used, and the relevant mechanical properties are reduced compared with Examples 1 and 2; in Example 5, no carbon fiber is added, and the content of glass fiber and short-cut aramid fiber is appropriately increased. The impact strength, flexural modulus and other properties of the prepared splines are significantly reduced; in Example 6 and Example 7, although excellent relevant mechanical properties can be guaranteed, due to the extremely low content of the antistatic agent, the surface resistance of both is greater than 10 12 , the test result is unqualified; in summary, the present invention can meet the requirements of high temperature sealing of 70°C and free fall of 1.5 meters with full load at -55°C without damage by adding appropriate amount of carbon fiber and permanent antistatic agent to the raw materials, while having excellent antistatic performance to meet the antistatic performance requirements of product protection; and after processing it into splines, the overall extension is uniform green, which is conducive to processing to obtain packaging boxes with qualified product performance and appearance.

[0104] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0105] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A low-temperature impact-resistant and high-temperature deformation-resistant permanent antistatic polypropylene composite material, characterized in that: The composite material comprises the following components in percentage by mass: Polypropylene 50-80%, glass fiber 0-20%, chopped aramid fiber 0-10%, carbon fiber 0-8%, compatibilizer 3-8%, special toughening agent 5-20%, lubricant 0.5-1%, permanent antistatic agent 5-10%, coupling agent 0.1-1%, other additives 0.1-2%, green masterbatch 3-5%; Wherein, the mass percentage of each of the glass fiber, the chopped aramid fiber and the carbon fiber is not 0; the special toughening agent is one or two of propylene-ethylene copolymer, ethylene-hexene copolymer, ethylene-butene copolymer and ethylene-propylene-diene terpolymer, the length of the chopped aramid fiber is 2-15 mm; and the compatibilizer is polyethylene grafted maleic anhydride or polypropylene grafted maleic anhydride.

2. The low-temperature impact-resistant and high-temperature deformation-resistant permanent antistatic polypropylene composite material according to claim 1, characterized in that: The permanent antistatic agent is a hydrophilic antistatic agent.

3. The low-temperature impact-resistant and high-temperature deformation-resistant permanent antistatic polypropylene composite material according to claim 1, characterized in that: The hydrophilic antistatic agent includes one or more of sodium dodecylbenzenesulfonate, 1-ethyl-3-methylimidazolium ethyl sulfate, and trimethylhydroxyethylammonium methyl sulfate.

4. The low-temperature impact-resistant and high-temperature deformation-resistant permanent antistatic polypropylene composite material according to claim 1, characterized in that: The carbon fibers include short-cut carbon fibers with a length of 0.5-2 mm and long-cut carbon fibers with a length of 8-15 mm.

5. The low-temperature impact-resistant and high-temperature deformation-resistant permanent antistatic polypropylene composite material according to claim 4, characterized in that: The chopped carbon fibers account for 70% to 95% of the total carbon fiber mass.

6. The low-temperature impact-resistant and high-temperature deformation-resistant permanent antistatic polypropylene composite material according to claim 1, characterized in that: The carbon fiber is a modified carbon fiber whose surface contains hydroxyl groups or carboxyl groups after grafting modification.

7. The low-temperature impact-resistant and high-temperature deformation-resistant permanent antistatic polypropylene composite material according to claim 1, characterized in that: The lubricant is at least one of stearate, silicone, and fatty acid amide.

8. The low-temperature impact-resistant and high-temperature deformation-resistant permanent antistatic polypropylene composite material according to claim 1, characterized in that: The lubricant is at least one of stearate, silicone, and fatty acid amide.

9. The low-temperature impact-resistant and high-temperature deformation-resistant permanent antistatic polypropylene composite material according to claim 8, characterized in that: The stearate is calcium stearate or zinc stearate, the silicone is high molecular weight siloxane, and the fatty acid amide is oleamide or ethylene bisstearamide.

10. The method for preparing the low-temperature impact-resistant and high-temperature deformation-resistant permanent antistatic polypropylene composite material according to any one of claims 1 to 9, characterized in that: The following steps are involved: (1) Weigh each raw material according to the formula ratio; (2) Polypropylene, a compatibilizer, a special toughening agent, a lubricant, a permanent antistatic agent, other additives, and a green masterbatch are uniformly mixed to obtain material A; (3) After pre-treating the carbon fiber and the coupling agent, glass fiber and chopped aramid fiber are added and mixed to obtain material B; (4) Material A is fed through the main feeding port of a twin-screw extruder, and material B is fed through the side feeding port, and the mixture is melt-blended by the twin-screw extruder. The extruded material strips are granulated by a pelletizer to prepare a permanent anti-static polypropylene composite material that is resistant to low-temperature impact and high-temperature deformation.

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