High-rigidity lightweight PCR PP carbon fiber material and preparation method thereof

Abstract

The invention relates to the field of regenerated PP composite materials, and discloses a high-rigidity lightweight PCR PP carbon fiber material. The high-rigidity lightweight PCR PP carbon fiber material is prepared from the following raw materials in parts by weight: 80-100 parts of recycled PP resin, 20-30 parts of pretreated carbon fiber powder, 6-12 parts of a flexibilizer, 4-8 parts of a compatilizer, 1-3 parts of a lubricant and 1-3 parts of an antioxidant. The pretreated carbon fiber powder is prepared from carbon fiber powder, a silane coupling agent, epoxy vinyl resin, o-diallyl bisphenol A diglycidyl ether, 4-vinylbenzyl glycidyl ether, dodecyl glycidyl ether and a catalyst. The prepared PCR PP carbon fiber material is used in a low-temperature and humid and hot environment for a long time, has relatively good rigidity and relatively good impact toughness, and has the advantage of light weight.

Description

Technical Field

[0001] This application relates to the field of recycled PP composite materials, and in particular to a high-rigidity, lightweight PCR PP carbon fiber material and its preparation method. Background Technology

[0002] Polypropylene (PP), as a general-purpose plastic, is widely used in packaging, home appliances, automobiles, and daily consumer goods due to its good chemical stability, ease of processing, and low cost. In recent years, with the increasing global emphasis on resource recycling and sustainable development, recycled plastics made from post-consumer recycled (PCR) polypropylene have shown significant advantages in reducing virgin resource consumption, lowering carbon emissions, and alleviating environmental pressure. PCR PP materials obtained through physical or chemical recycling, after appropriate purification and modification, can partially replace virgin plastics and are widely used in automotive interior parts, auxiliary components of home appliances, and sports and fitness equipment.

[0003] However, recycled PP materials are prone to molecular chain breakage and degradation during recycling, crushing, and reprocessing. At the same time, a small amount of impurities may be mixed in the raw materials, resulting in defects such as poor rigidity and insufficient mechanical strength compared to virgin PP materials. This limits its application in key components (such as automobile door panel frames, load-bearing shells of home appliances, precision mechanical parts, etc.) that have high requirements for material rigidity and structural load-bearing capacity.

[0004] To address the need for improved rigidity and lightweight properties in recycled PP materials, existing technologies commonly employ carbon fiber modification. Specifically, carbon fibers pretreated with a coupling agent are mixed with recycled PP resin, compatibilizers, antioxidants, and other auxiliary agents in a specific ratio. This mixture is then melt-blended and granulated using a twin-screw extruder to obtain carbon fiber-modified recycled PP composites. By adding carbon fiber in this manner, the excellent mechanical reinforcing properties of carbon fiber can significantly improve the flexural modulus, tensile strength, and other rigidity-related properties of recycled PP materials. Simultaneously, the low density of carbon fiber allows for better maintenance of the material's lightweight characteristics while enhancing rigidity, aligning with the demands of lightweight development.

[0005] However, there are still insurmountable drawbacks to modifying recycled PP materials with carbon fibers: On the one hand, due to the degradation of molecular chains and changes in surface properties during the recycling process, the recycled PP matrix has poor interfacial compatibility with carbon fibers. Even with pretreatment of carbon fibers with coupling agents, it is difficult to achieve a tight bond between the two. When PCR PP carbon fiber materials are used for a long time in extreme environments such as long-term low temperature or high temperature and humidity, it will affect the impact toughness and service life of the material, causing problems such as cracks on the material surface. On the other hand, carbon fibers are prone to agglomeration during melt blending, making it difficult to disperse evenly in the recycled PP matrix. This leads to uneven local properties of the material, with strong and weak areas coexisting, further reducing the overall mechanical stability of the material. Summary of the Invention

[0006] To address the issue that existing PCR PP carbon fiber materials, when used in critical components requiring high rigidity and structural load-bearing capacity, are prone to cracking due to reduced rigidity and insufficient impact toughness in long-term humid or low-temperature environments, this application provides a high-rigidity, lightweight PCR PP carbon fiber material and its preparation method.

[0007] In a first aspect, this application provides a high-rigidity, lightweight PCR PP carbon fiber material, employing the following technical solution: A high-rigidity, lightweight PCR PP carbon fiber material is prepared from the following raw materials in parts by weight: 80-100 parts of recycled PP resin 20-30 parts of pretreated carbon fiber powder 6-12 parts toughening agent 4-8 parts compatibilizer 1-3 parts lubricant Antioxidant 1-3 parts; The pretreated carbon fiber powder is composed of carbon fiber powder, silane coupling agent, epoxy vinyl resin, o-diallyl bisphenol A diglycidyl ether, 4-vinyl benzyl glycidyl ether, dodecyl glycidyl ether and catalyst.

[0008] By adopting the above technical solutions, using recycled PP resin as the basic raw material and adding pretreated carbon fiber powder can improve the rigidity of the material and maintain its lightweight properties, thus improving the problem of reduced rigidity and impact toughness caused by molecular chain segment breakage or aging of recycled PP resin. Toughening agents can further improve the impact toughness of the material, making it less prone to cracking when subjected to external impact. Compatibilizers can improve the compatibility between various raw materials, promoting better bonding of different raw materials to form a uniform and stable material system. Lubricants can reduce the friction of the material during processing, making the material easier to process and shape. Antioxidants can prevent the material from being oxidized during use, extending the service life of the material.

[0009] In the pretreated carbon fiber powder, a silane coupling agent is used to modify the carbon fiber powder, enhancing its compatibility and dispersion properties with other components. Epoxy vinyl resin, o-diallyl bisphenol A diglycidyl ether, 4-vinylbenzyl glycidyl ether, and dodecyl glycidyl ether undergo cross-linking reactions under the action of a catalyst, forming a uniform compatibility interface on the surface of the carbon fiber powder. Furthermore, under the synergistic effect of the toughening agent and compatibilizer, the compatibility of the carbon fiber powder in the resin matrix is ​​optimized, improving the material's rigidity while also providing good impact toughness and reducing the likelihood of cracking. The toughening agent works synergistically with the pretreated carbon fiber powder to improve the material's rigidity while ensuring its impact toughness. The PCR PP carbon fiber material prepared in this application exhibits good rigidity and impact toughness under long-term low-temperature and humid heat environments, while maintaining its lightweight advantage, making it suitable for critical components requiring high material rigidity and structural load-bearing capacity.

[0010] Preferably, the pretreated carbon fiber powder is prepared from the following raw materials in parts by weight: 100-120 parts carbon fiber powder 2-4 parts of silane coupling agent 10-20 parts epoxy vinyl resin 3-5 parts of o-diallyl bisphenol A diglycidyl ether 2-4 parts of 4-vinylbenzyl glycidyl ether 2-4 parts of dodecyl glycidyl ether Catalyst 0.001-0.002 parts.

[0011] By employing the above technical solution, carbon fiber powder, silane coupling agent, epoxy vinyl resin, o-diallylbisphenol A diglycidyl ether, 4-vinylbenzyl glycidyl ether, and dodecyl glycidyl ether are formulated in a specific weight ratio. The silane coupling agent improves the interfacial properties of carbon fiber powder with other organic components. Epoxy vinyl resin itself possesses good chemical resistance and mechanical properties; when formulated with silane-modified carbon fiber powder in an appropriate ratio, it enhances the overall structural strength. The o-diallylbisphenol A diglycidyl ether, 4-vinylbenzyl glycidyl ether, and dodecyl glycidyl ether, compounds containing active groups, can synergistically enhance the epoxy vinyl resin, further improving the crosslinking degree and flexibility of the material. This synergistic effect among the components allows the pretreated carbon fiber powder to effectively improve the interfacial compatibility between recycled PP resin and carbon fiber, reducing agglomeration of carbon fiber during melt blending and resulting in a more uniform material.

[0012] Preferably, the pretreated carbon fiber powder is prepared by the following steps: 1) Carbon fiber powder and silane coupling agent are kneaded and dispersed to obtain silane-modified carbon fiber powder; 2) Add epoxy vinyl resin, o-diallyl bisphenol A diglycidyl ether, 4-vinyl benzyl glycidyl ether, dodecyl glycidyl ether and catalyst to silane-modified carbon fiber powder and knead by heating to obtain pretreated carbon fiber powder.

[0013] By adopting the above technical solution, the first step involves kneading and dispersing carbon fiber powder and silane coupling agent. The silane coupling agent can improve the surface properties of carbon fiber powder, enabling it to have better bonding ability with other subsequently added components, thereby obtaining silane-modified carbon fiber powder. The second step involves adding epoxy vinyl resin, o-diallyl bisphenol A diglycidyl ether, 4-vinylbenzyl glycidyl ether, dodecyl glycidyl ether, and a catalyst to the silane-modified carbon fiber powder and kneading it at a high temperature. These substances react under the conditions of catalyst and temperature and combine with the silane-modified carbon fiber powder, further improving the dispersion uniformity and compatibility of carbon fiber powder in recycled PP resin.

[0014] Preferably, the kneading temperature in step S2 is 90-110℃ and the kneading time is 1-2 hours.

[0015] By adopting the above technical solution, the optimal kneading and dispersion time and temperature can enable each component to form a compatible and dispersed interface on the surface of carbon fiber powder.

[0016] Preferably, the recycled PP resin is obtained by crushing, screening, acid washing and drying recycled PP waste.

[0017] By adopting the above technical solution, recycled PP waste is crushed, screened, acid-washed and dried to obtain recycled PP resin. This process can remove impurities from the recycled PP waste, improve the purity of the recycled PP resin, and further optimize the overall performance of the obtained material.

[0018] Preferably, the toughening agent is composed of POE elastomer and PU-hydrogenated styrene block copolymer in a weight ratio of (1-2):1.

[0019] By adopting the above technical solutions, POE elastomers possess excellent elasticity and flexibility, effectively absorbing and dispersing stress, thereby improving the material's impact resistance and making it less prone to breakage under external forces. PU-hydrogenated styrene block copolymers exhibit excellent low-temperature resistance and high strength, enhancing the material's toughness and rigidity in low-temperature environments and preventing brittleness and cracking at low temperatures. These two components, combined in an optimal weight ratio, form a toughening agent, working synergistically to improve the impact toughness and overall mechanical properties of high-rigidity, lightweight PCR PP carbon fiber materials under various conditions.

[0020] Preferably, the compatibilizer is maleic anhydride-grafted polyethylene and / or maleic anhydride-grafted POE.

[0021] By employing the above technical solutions, maleic anhydride-grafted polyethylene (MPPE) as a compatibilizer can effectively improve the interfacial compatibility between recycled PP resin and pretreated carbon fiber powder, enabling better bonding and enhancing the overall stability and mechanical properties of the material. Maleic anhydride-grafted POE (POE) can also strengthen the interfacial bonding between recycled PP resin and pretreated carbon fiber powder, and its elasticity helps improve the material's toughness and impact resistance. When used synergistically, MPPE and POE can function at different levels, further optimizing the interfacial bonding between recycled PP resin and pretreated carbon fiber powder, achieving a better balance between rigidity and toughness, thereby improving the overall performance of the resulting high-rigidity, lightweight PCR PP carbon fiber material.

[0022] Preferably, the lubricant is any one or a combination of polyethylene wax, calcium stearate, and zinc stearate, and the antioxidant is antioxidant 168 and / or antioxidant 1010.

[0023] By adopting the above technical solution, the above lubricant can reduce the frictional resistance of the material during processing, improve the material's fluidity and processing performance; by selecting antioxidant 168 and / or antioxidant 1010 as antioxidants, the performance of the material can be prevented from deteriorating due to oxidation during processing and use, thereby improving the material's stability and service life.

[0024] Secondly, this application provides a method for preparing a high-rigidity, lightweight PCR PP carbon fiber material, employing the following technical solution: A method for preparing a high-rigidity, lightweight PCR PP carbon fiber material includes the following steps: S1. Dry the recycled PP resin; S2. Recycled PP resin, pretreated carbon fiber powder, toughening agent, compatibilizer, lubricant and antioxidant are melt-extruded, cooled and pelletized to obtain high-rigidity lightweight PCR PP carbon fiber material.

[0025] By adopting the above technical solution, the recycled PP resin is first dried to remove moisture and avoid adverse effects of moisture on the subsequent melt extrusion process and material properties. Then, the dried recycled PP resin is melt-extruded, cooled, and pelletized with pretreated carbon fiber powder, toughening agent, compatibilizer, lubricant, and antioxidant. This process ensures that all raw materials are fully and uniformly mixed. The resulting high-rigidity, lightweight PCR PP carbon fiber material exhibits good rigidity and impact toughness under long-term low-temperature and humid heat environments, and is also lightweight. At the same time, the pretreated carbon fiber powder, under the synergistic effect of compatibilizer and toughening agent, can improve the interfacial compatibility with the recycled PP resin, prevent carbon fiber agglomeration, and enhance the overall mechanical property stability of the material.

[0026] Preferably, the melt extrusion temperature is 210-230℃.

[0027] By adopting the above technical solution, when preparing high-rigidity and lightweight PCR PP carbon fiber materials, the recycled PP resin, pretreated carbon fiber powder, toughening agent, compatibilizer, lubricant and antioxidant are melt-extruded at 210-230℃. This ensures that the raw materials are fully melt-mixed, which helps to produce PCR PP carbon fiber materials with good rigidity and impact toughness and light weight that can be used in long-term low temperature and humid heat environments.

[0028] In summary, this application includes at least one of the following beneficial technical effects: 1. The high-rigidity, lightweight PCR PP carbon fiber material of this application is prepared from recycled PP resin, pretreated carbon fiber powder, toughening agent, compatibilizer, lubricant, and antioxidant. The pretreated carbon fiber powder is prepared from carbon fiber powder, silane coupling agent, epoxy vinyl resin, o-diallyl bisphenol A diglycidyl ether, 4-vinylbenzyl glycidyl ether, dodecyl glycidyl ether, and catalyst. The prepared PCR PP carbon fiber material has good rigidity and impact toughness when used in long-term low temperature and humid heat environments, while maintaining the advantage of light weight. It is suitable for key components with high requirements for material rigidity and structural load-bearing capacity.

[0029] 2. The toughening agent is composed of POE elastomer and PU-hydrogenated styrene block copolymer. The two work synergistically to further improve the impact toughness and comprehensive mechanical properties of high-rigidity lightweight PCR PP carbon fiber material under different environments. Detailed Implementation

[0030] The present application will be further described in detail below with reference to preparation examples and embodiments.

[0031] The following are some of the sources and specifications of the raw materials used in this application. The raw materials used in the preparation examples and embodiments of this application can all be obtained commercially, including but not limited to the following models and manufacturers of raw materials. Raw materials with equivalent performance can also be used: 1. Recycled PP resin: Particle size 1-8mm, cantilever beam notched impact strength: 46-48 J / m, heat distortion temperature 85-88℃, tensile strength 12-13MPa, obtained from recycled PP waste through crushing, screening, pickling and drying. The recycled PP waste comes from Heilongjiang Zhongzai Recycling Waste Household Appliance Dismantling Co., Ltd. 2. Carbon fiber powder: fineness 2-4µm, aspect ratio 4-6, density 1.75g / cm³ 3 Carbon content 99%; 3. Epoxy vinyl resin: Atlac® 430 resin; 4. POE elastomer: Mitsui Chemicals, DF640; 5. PU-hydrogenated styrene block copolymer: Kuraray 5265; 6. Maleic anhydride-grafted polyethylene: Huaxiang ZJ-800E; 7. Maleic anhydride grafted with POE: Mitsui Chemicals, MA8510; 8. Polyethylene wax: Mitsui Chemicals, 1105A.

[0032] Example of preparation of pretreated carbon fiber powder Preparation Example 1 Preparation Example 1 discloses a pretreated carbon fiber powder, which is prepared by the following steps: 1) 10 kg of carbon fiber powder and 0.2 kg of KH550 were kneaded and dispersed at a temperature of 60 °C for 40 min to obtain silane-modified carbon fiber powder. 2) Add 1 kg of epoxy vinyl resin, 0.3 kg of o-diallyl bisphenol A diglycidyl ether, 0.4 kg of 4-vinyl benzyl glycidyl ether, 0.2 kg of dodecyl glycidyl ether and 0.1 g of polyetheramine D230 as catalysts to silane-modified carbon fiber powder and knead it at a temperature of 90°C for 2 hours to obtain pretreated carbon fiber powder.

[0033] Preparation Examples 2-3 The difference between Preparation Example 2-3 and Preparation Example 1 lies in the amount of raw materials used and the preparation conditions, as detailed in Table 1 below.

[0034] Table 1. Parameters for Preparation Examples 1-3

[0035] Preparation of Comparative Example 1 The difference between Comparative Example 1 and Preparation Example 3 is that 4-vinylbenzyl glycidyl ether was replaced with an equal amount of o-diallylbisphenol A diglycidyl ether; otherwise, they were the same as in Preparation Example 3.

[0036] Preparation of Comparative Example 2 The difference between Comparative Example 2 and Preparation Example 3 is that dodecyl glycidyl ether was replaced with an equal amount of 4-vinylbenzyl glycidyl ether, otherwise it was the same as Preparation Example 3.

[0037] Preparation of Comparative Example 3 The difference between Comparative Example 3 and Preparation Example 3 is that o-diallylbisphenol A diglycidyl ether was replaced with glycidyl methacrylate in equal amounts; otherwise, they were the same as in Preparation Example 3.

[0038] Preparation of Comparative Example 4 The difference between Comparative Example 4 and Preparation Example 3 is that the pretreated carbon fiber powder was prepared by the following steps: 10 kg of carbon fiber powder and 1 kg of KH550 were kneaded and dispersed at a temperature of 60°C for 40 min to obtain the pretreated carbon fiber powder. Example Example 1

[0039] Example 1 discloses a high-rigidity, lightweight PCR PP carbon fiber material, which is prepared by the following steps: S1. Dry the recycled PP resin in an oven at 70-80℃ until the moisture content is less than 0.05 wt%. S2. 8 kg of recycled PP resin, 2 kg of pretreated carbon fiber powder prepared in Example 1, 0.6 kg of toughening agent, 0.8 kg of compatibilizer, 0.1 kg of lubricant and 0.1 kg of antioxidant were melt-extruded using a twin-screw extruder. The melt extrusion temperature was controlled as follows: Zone 1 210℃, Zone 2 210℃, Zone 3 220℃, Zone 4 230℃, Zone 5 230℃, and Die 230℃. After water cooling, the material was pelletized to obtain a high-rigidity lightweight PCR PP carbon fiber material. The toughening agent is SEBS, which is Kuraray 4033; the compatibilizer is maleic anhydride-grafted polyethylene; the lubricant is polyethylene wax; and the antioxidant is composed of antioxidant 168 and antioxidant 1010 in a weight ratio of 1:1.

[0040] Example 2-3 The difference between Examples 2-3 and Example 1 lies in the amount of raw materials used and the preparation conditions, as detailed in Table 2 below.

[0041] Table 2 Parameter table for Examples 1-3

[0042] Example 4

[0043] The difference between Example 4 and Example 3 is that the toughening agent is composed of POE elastomer and PU-hydrogenated styrene block copolymer in a weight ratio of 1:1, while the rest is the same as in Example 3.

[0044] Example 5

[0045] The difference between Example 5 and Example 3 is that the toughening agent is composed of POE elastomer and PU-hydrogenated styrene block copolymer in a weight ratio of 2:1, while the rest is the same as in Example 3.

[0046] Comparative Example Comparative Example 1 The difference between Comparative Example 1 and Example 3 is that the pretreated carbon fiber powder was derived from the preparation of Comparative Example 1, while the rest is the same as Example 3.

[0047] Comparative Example 2 The difference between Comparative Example 2 and Example 3 is that the pretreated carbon fiber powder was derived from the preparation of Comparative Example 2, while the rest is the same as Example 3.

[0048] Comparative Example 3 The difference between Comparative Example 3 and Example 3 is that the pretreated carbon fiber powder was derived from the preparation of Comparative Example 3, while the rest is the same as Example 3.

[0049] Comparative Example 4 The difference between Comparative Example 4 and Example 3 is that the pretreated carbon fiber powder was derived from the preparation of Comparative Example 3, while the rest is the same as Example 3.

[0050] Performance testing The performance of the high-rigidity, lightweight PCR PP carbon fiber materials prepared in Examples 1-5 and Comparative Examples 1-4 was tested below: During testing, the high-rigidity, lightweight PCR PP carbon fiber material was melted and injection molded at 210℃ to prepare test samples corresponding to the testing standards.

[0051] 1. Tensile strength test According to the test method in GB / T 1040, dumbbell-shaped specimens were used to test the tensile strength (unit: MPa) of the test specimens at a tensile rate of 300 mm / min, and the test results were recorded. 2. Impact strength test According to the ASTM D256 test standard, the above test samples were subjected to cantilever beam notched impact strength test (unit: J / m), which was recorded as impact strength. The test results were recorded. 3. Low temperature and damp heat stability test The test samples were placed in a low temperature environment of -20℃ and a high temperature and high humidity environment of 85℃ and 85% for 7 days. The cantilever beam notched impact strength test (unit: J / m) was carried out on the above test samples according to the test standard of ASTM D256. The rate of change of impact strength in the low temperature and humid heat environments was calculated and the test results were recorded. The following are the performance test data of the high-rigidity and lightweight PCR PP carbon fiber materials prepared in Examples 1-5 and Comparative Examples 1-4, as detailed in Table 3 below.

[0052] Table 3 Performance data of the high-rigidity, lightweight PCR PP carbon fiber materials prepared in Examples 1-5 and Comparative Examples 1-4

[0053] Based on Examples 1-3 and Comparative Examples 1-4, and in conjunction with Table 3, it can be concluded that using the pretreated carbon fiber component prepared in this application to prepare PCR PP carbon fiber material can significantly improve the rigidity and impact toughness of the prepared PCR PP carbon fiber material, making it less prone to cracking during long-term use in low-temperature and humid heat environments. In Comparative Examples 1-3, the types and proportions of epoxy vinyl resin, o-diallyl bisphenol A diglycidyl ether, 4-vinylbenzyl glycidyl ether, and dodecyl glycidyl ether in the pretreated carbon fiber powder were changed. The tensile strength and impact toughness of the prepared PCR PP carbon fiber material decreased. After low-temperature and humid heat tests, the impact strength showed a significant decrease. This may be because the synergistic effect of these components was altered, resulting in excessive rigidity of the prepared PCR PP carbon fiber material, leading to embrittlement and a decrease in both tensile and impact strength. In Comparative Example 4, the tensile strength and impact strength of the PCR PP carbon fiber material prepared by pretreating carbon fiber powder with silane coupling agent alone were reduced. After low temperature and damp heat tests, the impact strength was significantly reduced. This may be because the modification of carbon fiber powder with silane coupling agent alone resulted in poor interfacial bonding performance after long-term use, which led to the embrittlement of the material.

[0054] Based on Examples 3 and 4-5, and referring to Table 3, it can be concluded that further optimization of the type and proportion of toughening agent in this application can significantly improve the rigidity of the prepared PCR PP carbon fiber material while also enhancing its impact toughness. The tensile strength and impact toughness of the PCR PP carbon fiber materials in Examples 4-5 are improved.

[0055] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A high-rigidity, lightweight PCR PP carbon fiber material, characterized in that, It is prepared from the following raw materials in parts by weight: 80-100 parts of recycled PP resin 20-30 parts of pretreated carbon fiber powder 6-12 parts toughening agent 4-8 parts compatibilizer 1-3 parts lubricant Antioxidant 1-3 parts; The pretreated carbon fiber powder is composed of carbon fiber powder, silane coupling agent, epoxy vinyl resin, o-diallyl bisphenol A diglycidyl ether, 4-vinyl benzyl glycidyl ether, dodecyl glycidyl ether and catalyst.

2. The high-rigidity, lightweight PCR PP carbon fiber material according to claim 1, characterized in that, The pretreated carbon fiber powder is prepared from the following raw materials in parts by weight: 100-120 parts carbon fiber powder 2-4 parts of silane coupling agent 10-20 parts epoxy vinyl resin 3-5 parts of o-diallyl bisphenol A diglycidyl ether 2-4 parts of 4-vinylbenzyl glycidyl ether 2-4 parts of dodecyl glycidyl ether Catalyst 0.001-0.002 parts.

3. A high-rigidity, lightweight PCR PP carbon fiber material according to claim 1 or 2, characterized in that, The pretreated carbon fiber powder is prepared by the following steps: 1) Carbon fiber powder and silane coupling agent are kneaded and dispersed to obtain silane-modified carbon fiber powder; 2) Add epoxy vinyl resin, o-diallyl bisphenol A diglycidyl ether, 4-vinyl benzyl glycidyl ether, dodecyl glycidyl ether and catalyst to silane-modified carbon fiber powder and knead by heating to obtain pretreated carbon fiber powder.

4. The high-rigidity, lightweight PCR PP carbon fiber material according to claim 3, characterized in that, The kneading temperature in step S2 is 90-110℃, and the kneading time is 1-2 hours.

5. The high-rigidity, lightweight PCR PP carbon fiber material according to claim 1, characterized in that, The recycled PP resin is obtained by crushing, screening, acid washing and drying recycled PP waste.

6. The high-rigidity, lightweight PCR PP carbon fiber material according to claim 1, characterized in that, The toughening agent is composed of POE elastomer and PU-hydrogenated styrene block copolymer in a weight ratio of (1-2):

1.

7. The high-rigidity, lightweight PCR PP carbon fiber material according to claim 1, characterized in that, The compatibilizer is maleic anhydride-grafted polyethylene and / or maleic anhydride-grafted POE.

8. The high-rigidity, lightweight PCR PP carbon fiber material according to claim 1, characterized in that, The lubricant is any one or a combination of polyethylene wax, calcium stearate, and zinc stearate, and the antioxidant is antioxidant 168 and / or antioxidant 1010.

9. A method for preparing a high-rigidity, lightweight PCR PP carbon fiber material as described in any one of claims 1-8, characterized in that, Includes the following steps: S1. Dry the recycled PP resin; S2. Recycled PP resin, pretreated carbon fiber powder, toughening agent, compatibilizer, lubricant and antioxidant are melt-extruded, cooled and pelletized to obtain high-rigidity lightweight PCR PP carbon fiber material.

10. The method for preparing a high-rigidity, lightweight PCR PP carbon fiber material according to claim 9, characterized in that, The melt extrusion temperature is 210-230℃.

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