A glass fiber reinforced polypropylene material, its preparation method and application

Abstract

The application discloses a glass fiber reinforced polypropylene material and a preparation method and application thereof, and belongs to the technical field of polypropylene materials. The glass fiber reinforced polypropylene material comprises the following raw materials in parts by mass: 97-119 parts of polypropylene resin, 12-24 parts of modified glass fiber, 2-4 parts of an antioxidant, 9-15 parts of magnesium hydroxide, 0.5-1 part of a lubricant and 3-5 parts of maleic anhydride grafted polypropylene. The magnesium hydroxide is used as an environmentally-friendly halogen-free flame retardant, significantly improves the flame retardancy of the material, and reduces the usage amount. The glass fiber is modified through multiple steps of chemical modification, the problems of exposed glass fiber and floating fiber are reduced, and the mechanical properties and heat resistance of the material are significantly improved. In summary, the polypropylene material prepared by the application has mechanical properties, flame retardancy and heat resistance, solves the core problems of poor interface compatibility, low flame retardant efficiency and insufficient high-temperature performance of traditional glass fiber reinforced polypropylene materials in the automobile industry, and has important application value in the field of automobile industry.

Description

Technical Field

[0001] This invention belongs to the field of polypropylene material technology, specifically relating to a glass fiber reinforced polypropylene material, its preparation method, and its application. Background Technology

[0002] In the automotive industry, the application of lightweight and high-performance materials has become an important trend in technological development. Polypropylene (PP) is widely used in automotive interior and exterior parts, structural components, and functional parts due to its advantages such as low density, excellent processing performance, and moderate cost. However, ordinary polypropylene has poor heat resistance, with a heat distortion temperature (HDT) typically below 100°C. In high-temperature areas such as the engine compartment and around the turbocharger, it is prone to softening and deformation, which seriously affects the dimensional stability and service life of parts.

[0003] To effectively overcome these shortcomings of polypropylene materials, glass fiber reinforced polypropylene (GFRP) materials have emerged. Glass fiber possesses high strength, high modulus, and good chemical stability. Adding it to the polypropylene matrix can significantly improve the material's mechanical properties, such as tensile strength, flexural strength, and rigidity, enabling GFRP materials to better meet the structural strength requirements of automotive components. In the trend of automotive lightweighting, GFRP, with its high specific strength, can effectively reduce vehicle weight while ensuring component performance, thereby reducing fuel consumption and emissions, aligning with the modern automotive industry's pursuit of energy conservation and environmental protection. However, glass fiber and polypropylene materials have poor compatibility. While a high proportion of glass fiber can improve mechanical strength and heat resistance, it leads to a sharp drop in impact toughness, and problems such as exposed glass fiber and loose fiber can easily occur during processing.

[0004] As the automotive industry increasingly demands stringent flame-retardant performance from materials, particularly for critical components such as battery pack peripherals and high-voltage electrical boxes in new energy vehicles, which must meet the UL94V-0 flame-retardant standard, pure polypropylene's limiting oxygen index (LOI) is only 17%-18%, classifying it as a flammable material and posing a serious safety hazard. Currently available metal hydroxide flame retardants (such as aluminum hydroxide and magnesium hydroxide) suffer from drawbacks such as high addition amounts (typically 25%-40%) and poor synergy with glass fiber. High filler content not only significantly reduces the material's flowability and mechanical properties but also leads to defects like delamination and warping in injection-molded products due to the density difference between the flame retardant and glass fiber. To address these technical challenges, this invention develops a glass fiber reinforced polypropylene material that combines flame retardancy, heat resistance, and mechanical properties for application in the automotive parts field. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a glass fiber reinforced polypropylene material, its preparation method, and its application.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A glass fiber reinforced polypropylene material comprises the following raw materials in parts by weight: 97-119 parts polypropylene resin, 12-24 parts modified glass fiber, 2-4 parts antioxidant, 9-15 parts magnesium hydroxide, 0.5-1 part lubricant, and 3-5 parts maleic anhydride grafted polypropylene.

[0008] Magnesium hydroxide, as an environmentally friendly inorganic flame retardant, decomposes and absorbs a large amount of heat when heated, reducing the surface temperature of the material and delaying its thermal degradation and combustion process. Simultaneously, the water vapor produced during decomposition dilutes the concentration of flammable gases, thus playing a flame-retardant role. This invention utilizes maleic anhydride-grafted polypropylene as a compatibilizer to enhance the compatibility between magnesium hydroxide and the matrix, promoting the dispersion of magnesium hydroxide. Furthermore, the modified glass fiber also possesses certain flame-retardant properties and can synergistically work with magnesium hydroxide, thereby reducing the amount of magnesium hydroxide used and mitigating the side effect of decreased matrix mechanical properties caused by excessive magnesium hydroxide usage.

[0009] As a further technical solution, the antioxidant is one of triphenyl phosphite and trinonylphenyl phosphite.

[0010] As a further technical solution, the lubricant is one of erucamide, oleamide, and stearamide.

[0011] As a further technical solution, the modified glass fiber is prepared through the following steps:

[0012] Step B1: Under a nitrogen atmosphere, diphenylphosphine chloride is added to a three-necked round-bottom flask and stirred for 5-10 minutes in an ice bath at 0-5°C. Then, anhydrous piperazine and dichloromethane are mixed and stirred until dissolved. The mixture is then added dropwise to the flask through a constant dropping funnel. After the addition is complete, triethylamine is added dropwise to the flask through a constant dropping funnel. After the addition is complete, the temperature is raised to 50-60°C and the reaction time is 3-4 hours. After the reaction is complete, the mixture is allowed to stand at room temperature and then filtered. The filtrate is added to water and stirred for distillation. After filtration, the filter cake is ultrasonically washed with water several times to obtain the primary product.

[0013] Step B2: Under a nitrogen atmosphere, the primary product, 3-chloropropionic acid, and dichloromethane are added sequentially to a three-necked round-bottom flask. Under an ice bath at 0-5°C, the mixture is stirred for 5-10 minutes. Then, triethylamine is added dropwise to the flask through a constant dropping funnel. After the addition is complete, the temperature is raised to 60-65°C, and the reaction time is 5-6 hours. After the reaction is complete, the mixture is filtered, distilled under reduced pressure, and then purified by column chromatography to obtain the modifier.

[0014] Step B3: Dry the glass fiber in an oven at 80-100℃ for 2-4 hours to remove surface moisture and organic contaminants. Mix the dried glass fiber with an ethanol-water solution, sonicate for 2-5 minutes, and then add it to a three-necked round-bottom flask. Add KH-550 and acetic acid to adjust the pH of the solution to ≈4-5. Stir and react at room temperature for 6-8 hours. After the reaction is complete, filter the solution, sonicate it with an ethanol solution to remove physically adsorbed unreacted silane, and vacuum dry it to obtain silane-modified glass fiber.

[0015] Step B4: Mix silane-modified glass fiber with N,N-dimethylformamide, ultrasonically disperse for 5-10 minutes, then add to a three-necked round-bottom flask. Add the modifier and 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide as a catalyst, heat to 50-60℃, and react for 5-7 hours under stirring. After the reaction is complete, stop heating, filter, ultrasonically clean with ethanol solution, and vacuum dry to obtain modified glass fiber.

[0016] As a further technical solution, the ratio of the amounts of diphenylphosphine chloride, anhydrous piperazine, dichloromethane, and triethylamine in step B1 is 23.6g:8.6-9.5g:100mL:10.1g.

[0017] As a further technical solution, the ratio of the amount of the initial product, 3-chloropropionic acid, dichloromethane, and triethylamine in step B2 is 28.6g:10.8g:120mL:10.1g.

[0018] As a further technical solution, the ratio of glass fiber, ethanol aqueous solution, and KH-550 in step B3 is 5g:50mL:3.1-4.6g.

[0019] As a further technical solution, in step B3, the glass fiber is alkali-free glass fiber with a diameter of 10-15μm and a length of 3-5mm.

[0020] As a further technical solution, in step B4, the ratio of silane-modified glass fiber, N,N-dimethylformamide, modifier, and 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide is 5g:100mL:5.5-7.2g:2.3-3.5g.

[0021] The reaction formulas for the synthesis of the modifier are shown below:

[0022]

[0023] 1. From the perspective of the preparation process: In the process of preparing modified glass fiber, in step B1, diphenylphosphine chloride undergoes a nucleophilic substitution reaction with anhydrous piperazine to obtain a primary product. The primary product is then reacted with 3-chloropropionic acid to obtain a modifier. The modifier can undergo an amidation reaction with the amino groups of the silane-modified glass fiber to finally obtain the modified glass fiber. It should be noted that anhydrous piperazine needs to be in excess in step B1 to reduce side reactions.

[0024] 2. From a performance perspective: The modifier of this invention contains benzene rings as hydrophobic and heat-resistant groups, which not only improves the hydrophobicity of glass fiber but also enhances the heat resistance of the material. The hydrophobic glass fiber has better compatibility with the polypropylene matrix and is easier to disperse in the matrix, which greatly improves the mechanical properties and heat resistance of the material. Finally, the modifier also contains a phosphorus-nitrogen synergistic flame retardant system, which can enhance the flame retardant performance of the material to a certain extent.

[0025] This invention also provides a method for preparing glass fiber reinforced polypropylene material, comprising the following steps:

[0026] Step A1: Dry the polypropylene resin, modified glass fiber, antioxidant, magnesium hydroxide, lubricant and maleic anhydride grafted polypropylene to remove moisture from the raw materials and ensure the dryness of the raw materials.

[0027] Step A2: Add the dried polypropylene resin, modified glass fiber, antioxidant, magnesium hydroxide, lubricant and maleic anhydride grafted polypropylene to a high-speed mixer in sequence to mix the materials, so that the components are fully and evenly mixed to obtain a premix.

[0028] Step A3: Add the premix to the twin-screw extruder to melt and blend the components at high temperature. After extruding the melt through the twin-screw extruder, it is water-cooled and pelletized by a pelletizer and dried in an oven to obtain glass fiber reinforced polypropylene material.

[0029] As a further technical solution, the speed of the high-speed mixer during the mixing process is 800-1200 r / min, and the time is 5-10 min.

[0030] As a further technical solution, the temperature settings for each section of the twin-screw extruder are as follows: Zone 1 temperature 180-190℃, Zone 2 temperature 190-200℃, Zone 3 temperature 200-210℃, Zone 4 temperature 210-220℃, Zone 5 temperature 210-220℃, and Die head temperature 200-210℃.

[0031] As a further technical solution, the drying temperature of the oven is 60-70℃, and the drying time is 12-24h.

[0032] Another object of the present invention is to provide an application of the above-mentioned glass fiber reinforced polypropylene material in automotive parts.

[0033] The beneficial effects of this invention are:

[0034] 1. This invention uses magnesium hydroxide as an environmentally friendly halogen-free flame retardant, combined with the phosphorus-nitrogen synergistic system in modified glass fiber, which significantly improves the flame retardancy of the material and reduces the amount of magnesium hydroxide used.

[0035] 2. By chemically modifying glass fiber in multiple steps, the interfacial compatibility between glass fiber and polypropylene matrix is ​​greatly improved, reducing the problems of exposed glass fiber and floating fiber, thus significantly improving the mechanical properties and heat resistance of the material.

[0036] 3. Glass fiber reinforcement significantly reduces material density, enabling lightweight automotive components;

[0037] In summary, the polypropylene material prepared by this invention possesses mechanical properties, flame retardancy, and heat resistance, solving the core problems faced by traditional glass fiber reinforced polypropylene materials in the automotive industry, such as poor interfacial compatibility, low flame retardancy efficiency, and insufficient high-temperature performance. It has significant application value in the automotive industry. Detailed Implementation

[0038] To make the technical problems, technical solutions, and beneficial effects of this application clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0039] In the description of this specification, the references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0040] Example 1

[0041] Preparation of modified glass fiber:

[0042] Step B1: Under a nitrogen atmosphere, 23.6 g of diphenylphosphine chloride was added to a three-necked round-bottom flask and stirred for 5 min in an ice bath at 0 °C. Then, 8.6 g of anhydrous piperazine was mixed with 100 mL of dichloromethane and stirred until dissolved. The solution was then added dropwise to the flask through a constant dropping funnel. After the addition was complete, 10.1 g of triethylamine was added dropwise to the flask through a constant dropping funnel. After the addition was complete, the temperature was raised to 50 °C and the reaction time was 3 h. After the reaction was completed, the mixture was allowed to stand at room temperature and then filtered. The filtrate was added to water and stirred for distillation. After filtration, the filter cake was ultrasonically washed with water several times to obtain the primary product.

[0043] Step B2: Under a nitrogen atmosphere, 28.6 g of the initial product, 10.8 g of 3-chloropropionic acid, and 120 mL of dichloromethane were added sequentially to a three-necked round-bottom flask. After stirring for 5 min in an ice bath at 0 °C, 10.1 g of triethylamine was added dropwise to the flask through a constant dropping funnel. After the addition was complete, the temperature was raised to 60 °C and the reaction time was 5 h. After the reaction was completed, the mixture was filtered, distilled under reduced pressure, and then purified by column chromatography to obtain the modifier.

[0044] Step B3: Place 5g of alkali-free glass fiber (10μm in diameter and 3mm in length) in an 80℃ oven and dry for 2h to remove surface moisture and organic contaminants. Mix the dried glass fiber with 50mL of ethanol aqueous solution, sonicate for 2min, and then add it to a three-necked round bottom flask. Add 3.1g of KH-550 and acetic acid to adjust the pH of the solution to ≈4. Stir and react at room temperature for 6h. After the reaction is complete, filter, sonicate with ethanol solution to remove physically adsorbed unreacted silane, and vacuum dry to obtain silane-modified glass fiber.

[0045] Step B4: Mix 5g of silane-modified glass fiber with 100mL of N,N-dimethylformamide, sonicate for 5min, add to a three-necked round-bottom flask, add 5.5g of modifier and 2.3g of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide as catalyst, heat to 50℃, react for 5h under stirring. After the reaction is complete, stop heating, filter, sonicate with ethanol solution, and vacuum dry to obtain modified glass fiber.

[0046] Example 2

[0047] Preparation of modified glass fiber:

[0048] Step B1: Under a nitrogen atmosphere, 23.6 g of diphenylphosphine chloride was added to a three-necked round-bottom flask and stirred for 10 min in an ice bath at 5 °C. Then, 9.5 g of anhydrous piperazine was mixed with 100 mL of dichloromethane and stirred until dissolved. The solution was then added dropwise to the flask through a constant dropping funnel. After the addition was complete, 10.1 g of triethylamine was added dropwise to the flask through a constant dropping funnel. After the addition was complete, the temperature was raised to 60 °C and the reaction time was 4 h. After the reaction was completed, the mixture was allowed to stand at room temperature and then filtered. The filtrate was added to water and stirred for distillation. After filtration, the filter cake was ultrasonically washed with water several times to obtain the primary product.

[0049] Step B2: Under a nitrogen atmosphere, 28.6 g of the initial product, 10.8 g of 3-chloropropionic acid, and 120 mL of dichloromethane were added sequentially to a three-necked round-bottom flask. After stirring for 10 min in an ice bath at 5 °C, 10.1 g of triethylamine was added dropwise to the flask through a constant dropping funnel. After the addition was complete, the temperature was raised to 65 °C, and the reaction time was 6 h. After the reaction was completed, the mixture was filtered, distilled under reduced pressure, and then purified by column chromatography to obtain the modifier.

[0050] Step B3: Place 5g of alkali-free glass fiber (15μm in diameter and 5mm in length) in a 100℃ oven and dry for 4h to remove surface moisture and organic contaminants. Mix the dried glass fiber with 50mL of ethanol aqueous solution, sonicate for 5min, and then add it to a three-necked round bottom flask. Add 4.6g of KH-550 and acetic acid to adjust the pH of the solution to ≈5. Stir and react at room temperature for 8h. After the reaction is complete, filter, sonicate with ethanol solution to remove physically adsorbed unreacted silane, and vacuum dry to obtain silane-modified glass fiber.

[0051] Step B4: Mix 5g of silane-modified glass fiber with 100mL of N,N-dimethylformamide, ultrasonically disperse for 10min, then add to a three-necked round-bottom flask, add 7.2g of modifier and 3.5g of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide as catalyst, heat to 60℃, and react for 7h under stirring. After the reaction is complete, stop heating, filter, ultrasonically clean with ethanol solution, and vacuum dry to obtain modified glass fiber.

[0052] Example 3

[0053] A method for preparing glass fiber reinforced polypropylene material includes the following steps:

[0054] Step A1: Dry the polypropylene resin, the modified glass fiber prepared in Example 1, triphenyl phosphite, magnesium hydroxide, erucamide and maleic anhydride grafted polypropylene to remove moisture from the raw materials and ensure the dryness of the raw materials.

[0055] Step A2: Weigh 97g of dried polypropylene resin, 12g of modified glass fiber, 2g of triphenyl phosphite, 9g of magnesium hydroxide, 0.5g of erucamide and 3g of maleic anhydride-grafted polypropylene and add them to a high-speed mixer in sequence. Mix at 800r / min for 5min to ensure that all components are fully and evenly mixed to obtain a premix.

[0056] Step A3: Add the premixed material to the twin-screw extruder (the temperature of each section is set as follows: Zone 1 180-190℃, Zone 2 190-200℃, Zone 3 200-210℃, Zone 4 210-220℃, Zone 5 210-220℃, and Die temperature 200-210℃) to melt and blend the components at high temperature. After the melt is extruded through the twin-screw extruder, it is water-cooled and pelletized by a pelletizer. It is then dried in an oven at 60℃ for 12 hours to obtain glass fiber reinforced polypropylene material.

[0057] Example 4

[0058] A method for preparing glass fiber reinforced polypropylene material includes the following steps:

[0059] Step A1: Dry the polypropylene resin, the modified glass fiber prepared in Example 1, trinonylphenyl phosphite, magnesium hydroxide, oleamide and maleic anhydride grafted polypropylene to remove moisture from the raw materials and ensure the dryness of the raw materials.

[0060] Step A2: Weigh 108g of dried polypropylene resin, 18g of modified glass fiber, 3g of trinonylphenyl phosphite, 12g of magnesium hydroxide, 0.75g of oleamide and 4g of maleic anhydride-grafted polypropylene and add them to a high-speed mixer in sequence. Mix at 1000r / min for 10min to ensure that all components are fully and evenly mixed to obtain a premix.

[0061] Step A3: Add the premixed material to the twin-screw extruder (the temperature of each section is set as follows: Zone 1 temperature 180-190℃, Zone 2 temperature 190-200℃, Zone 3 temperature 200-210℃, Zone 4 temperature 210-220℃, Zone 5 temperature 210-220℃, and Die temperature 200-210℃) to melt and blend the components at high temperature. After the melt is extruded through the twin-screw extruder, it is water-cooled and pelletized by a pelletizer. It is then dried in an oven at 70℃ for 24 hours to obtain glass fiber reinforced polypropylene material.

[0062] Example 5

[0063] A method for preparing glass fiber reinforced polypropylene material includes the following steps:

[0064] Step A1: Dry the polypropylene resin, the modified glass fiber prepared in Example 1, trinonylphenyl phosphite, magnesium hydroxide, stearamide and maleic anhydride grafted polypropylene to remove moisture from the raw materials and ensure the dryness of the raw materials.

[0065] Step A2: Weigh 119g of dried polypropylene resin, 24g of modified glass fiber, 4g of trinonylphenyl phosphite, 15g of magnesium hydroxide, 1g of stearamide and 5g of maleic anhydride-grafted polypropylene and add them to a high-speed mixer in sequence. Mix at 1200r / min for 10min to ensure that the components are fully and evenly mixed to obtain a premix.

[0066] Step A3: Add the premixed material to the twin-screw extruder (the temperature of each section is set as follows: Zone 1 temperature 180-190℃, Zone 2 temperature 190-200℃, Zone 3 temperature 200-210℃, Zone 4 temperature 210-220℃, Zone 5 temperature 210-220℃, and Die temperature 200-210℃) to melt and blend the components at high temperature. After the melt is extruded through the twin-screw extruder, it is water-cooled and pelletized by a pelletizer. It is then dried in an oven at 70℃ for 24 hours to obtain glass fiber reinforced polypropylene material.

[0067] Comparative Example 1

[0068] Polypropylene material was prepared by replacing the modified glass fiber in Example 5 with 24g of unmodified alkali-free glass fiber, with the remaining steps being the same as in Example 5.

[0069] Comparative Example 2

[0070] Use unmodified, ordinary polypropylene material.

[0071] To verify the effect of the present invention on the properties of polypropylene materials, the polypropylene materials obtained in Examples 3, 4, 5 and the comparative example were tested. The test methods are as follows, and the test results are shown in Table 1.

[0072] The limiting oxygen index was determined according to GB / T 2406.2-2009 standard;

[0073] Tensile strength was determined according to GB / T 1040.2-2022 standard;

[0074] Bending strength was determined according to GB / T 9341-2008 standard;

[0075] The heat distortion temperature shall be determined in accordance with GB / T 1634.2-2019 standard;

[0076] Table 1

[0077]

[0078] As can be seen from the test results shown in Table 1, the polypropylene material prepared in the embodiments of the present invention has higher limiting oxygen index, tensile strength, flexural strength and heat distortion temperature than the comparative example. Therefore, the present invention has important application value in the automotive industry.

[0079] The above description is merely an example and illustration of the present invention. Any modifications or additions made by those skilled in the art to the specific embodiments described, or any substitutions made in a similar manner, should fall within the protection scope of the present invention.

Claims

1. A glass fiber reinforced polypropylene material, characterized in that, The raw materials include the following parts by weight: 97-119 parts polypropylene resin, 12-24 parts modified glass fiber, 2-4 parts antioxidant, 9-15 parts magnesium hydroxide, 0.5-1 part lubricant and 3-5 parts maleic anhydride grafted polypropylene. The modified glass fiber is prepared through the following steps: Step B1: Under a nitrogen atmosphere, diphenylphosphine chloride was added to a flask and stirred. Anhydrous piperazine and dichloromethane were then mixed and added dropwise to the flask. Triethylamine was then added, and the reaction was carried out at 50-60°C for 3-4 hours. After the reaction was complete, the primary product was obtained. The structural formula of the primary product is as follows: ； Step B2: Under a nitrogen atmosphere, the primary product, 3-chloropropionic acid, and dichloromethane are added to a flask. After stirring, triethylamine is added dropwise, and the reaction is carried out at 60-65°C for 5-6 hours. After the reaction is completed, the modifier is obtained. The structural formula of the modifier is as follows: ； Step B3: Dry the glass fiber, mix it with an ethanol-water solution, sonicate it, add it to a flask, add KH-550, and adjust the pH of the solution to ≈4-5. React at room temperature for 6-8 hours until the reaction is complete, and obtain silane-modified glass fiber. Step B4: Mix silane-modified glass fiber with N,N-dimethylformamide, disperse by ultrasonication, add to a flask, then add modifier and 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide, and react at 50-60℃ for 5-7 hours. Once the reaction is complete, modified glass fiber is obtained.

2. The glass fiber reinforced polypropylene material according to claim 1, characterized in that, In step B1, the ratio of diphenylphosphine chloride, anhydrous piperazine, dichloromethane, and triethylamine is 23.6g:8.6-9.5g:100mL:10.1g.

3. The glass fiber reinforced polypropylene material according to claim 1, characterized in that, In step B2, the ratio of the initial product, 3-chloropropionic acid, dichloromethane, and triethylamine is 28.6 g: 10.8 g: 120 mL: 10.1 g.

4. The glass fiber reinforced polypropylene material according to claim 1, characterized in that, In step B3, the ratio of glass fiber, ethanol aqueous solution, and KH-550 is 5g:50mL:3.1-4.6g; the glass fiber is alkali-free glass fiber with a diameter of 10-15μm and a length of 3-5mm.

5. The glass fiber reinforced polypropylene material according to claim 1, characterized in that, In step B4, the ratio of silane-modified glass fiber, N,N-dimethylformamide, modifier, and 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide is 5g:100mL:5.5-7.2g:2.3-3.5g.

6. The glass fiber reinforced polypropylene material according to claim 1, characterized in that, The antioxidant is one of triphenyl phosphite and trinonylphenyl phosphite.

7. The glass fiber reinforced polypropylene material according to claim 1, characterized in that, The lubricant is one of erucamide, oleamide, and stearamide.

8. A method for preparing a glass fiber reinforced polypropylene material according to any one of claims 1-7, characterized in that, Includes the following steps: Polypropylene resin, modified glass fiber, antioxidant, magnesium hydroxide, lubricant, and maleic anhydride-grafted polypropylene are dried, mixed, melt-blended, extruded, and pelletized to obtain glass fiber reinforced polypropylene material.

9. The application of a glass fiber reinforced polypropylene material according to any one of claims 1-7 in the automotive industry.

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