Glass fiber reinforced polypropylene material as well as preparation method and application thereof

Abstract

The invention discloses a glass fiber reinforced polypropylene material as well as a preparation method and application thereof, and belongs to the technical field of polypropylene materials. Comprising the following raw materials in parts by mass: 97-119 parts of polypropylene resin, 12-24 parts of modified glass fibers, 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. Wherein magnesium hydroxide is used as an environment-friendly halogen-free flame retardant, so that the flame retardance of the material is remarkably improved, and the dosage is reduced; through multi-step chemical modification of the glass fiber, the problems of exposure and floating of the glass fiber are reduced, so that the mechanical property and heat resistance of the material are remarkably improved; in conclusion, the polypropylene material prepared by the invention has mechanical property, flame retardance and heat resistance, solves the core problems of poor interfacial compatibility, low flame retardant efficiency, insufficient high-temperature performance and the like of the traditional glass fiber reinforced polypropylene material in the automobile industry, and has important application value in the field of the automobile industry.

Description

Technical Field

[0001] The present invention belongs to the technical field of polypropylene materials, and in particular relates to a glass fiber reinforced polypropylene material and a preparation method and application thereof. Background Art

[0002] In the automotive industry, the application of lightweight and high-performance materials has become a key technological trend. Polypropylene (PP), due to its low density, excellent processing properties, and affordable cost, is widely used in automotive interior and exterior trim, structural components, and functional parts. However, conventional PP has poor heat resistance, with a heat distortion temperature (HDT) typically below 100°C. It is prone to softening and deformation in high-temperature areas such as the engine compartment and around turbochargers, seriously affecting the dimensional stability and service life of components.

[0003] In order to effectively overcome these shortcomings of polypropylene materials, glass fiber reinforced polypropylene materials came into being. Glass fiber has the characteristics of 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, so that polypropylene materials can better meet the structural strength requirements of automotive parts. Under the general trend of lightweighting vehicles, glass fiber reinforced polypropylene materials, with their high specific strength, can effectively reduce the weight of the vehicle while ensuring the performance of the components, thereby reducing fuel consumption and exhaust emissions, which is in line with the modern automotive industry's pursuit of energy conservation and environmental protection. However, the compatibility of glass fiber and polypropylene materials is poor. Although the addition of a high proportion of glass fiber can improve mechanical strength and heat resistance, it causes a sharp drop in the material's impact toughness. Problems such as exposed glass fiber and floating fiber are prone to occur during processing.

[0004] As the automotive industry places increasingly stringent requirements on flame retardant properties of materials, especially key parts such as peripheral components of new energy vehicle battery packs and high-voltage electrical boxes must meet the UL94V-0 flame retardant standard, while the limiting oxygen index (LOI) of pure polypropylene is only 17%-18%, which is a flammable material and poses serious safety hazards. The metal hydroxide flame retardants (such as aluminum hydroxide and magnesium hydroxide) currently on the market have defects such as high addition amount (usually 25%-40%) and poor synergy with glass fiber. High filling amount not only greatly reduces the fluidity and mechanical properties of the material, but also causes defects such as delamination and warping in injection molded products due to the density difference between the flame retardant and the glass fiber. In response to the above technical pain points, the present invention has developed a glass fiber reinforced polypropylene material with flame retardancy, heat resistance and mechanical properties for application in the field of automotive parts. Summary of the Invention

[0005] The purpose of the present invention is to overcome the defects of the prior art and provide a glass fiber reinforced polypropylene material and a preparation method and application thereof.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A 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 antioxidant, 9-15 parts of magnesium hydroxide, 0.5-1 part of lubricant and 3-5 parts of maleic anhydride grafted polypropylene.

[0008] As an environmentally friendly inorganic flame retardant, magnesium hydroxide decomposes and absorbs a large amount of heat when heated, thereby reducing the surface temperature of the material and delaying the thermal degradation and combustion process of the material. At the same time, the water vapor generated by the decomposition can dilute the concentration of combustible gas and play a flame retardant role. The present invention uses maleic anhydride grafted polypropylene as a compatibilizer to enhance the compatibility of magnesium hydroxide with the matrix and promote the dispersion of magnesium hydroxide. In addition, the modified glass fiber also has a certain flame retardancy and can play a synergistic role with magnesium hydroxide, thereby reducing the amount of magnesium hydroxide used and reducing the side effect of the mechanical properties of the matrix decreased due to excessive magnesium hydroxide use.

[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 by the following steps:

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

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

[0014] Step B3, placing the glass fiber in an oven at 80-100°C for 2-4 hours to remove surface moisture and organic pollutants, mixing the dried glass fiber with an ethanol aqueous solution, ultrasonically treating for 2-5 minutes, adding the mixture to a three-necked round-bottom flask, and then adding KH-550 and acetic acid to adjust the pH of the solution to 4-5. The mixture was stirred at room temperature for 6-8 hours. After the reaction was complete, the mixture was filtered, ultrasonically cleaned with an ethanol solution to remove physically adsorbed unreacted silane, and vacuum dried to obtain a silane-modified glass fiber;

[0015] Step B4: Mix the silane-modified glass fiber with N,N-dimethylformamide, ultrasonically disperse for 5-10 minutes, add it to a three-necked round-bottom flask, add the modifier and 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide as a catalyst, heat to 50-60°C, react for 5-7 hours under stirring, 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 diphenylphosphinic chloride, anhydrous piperazine, dichloromethane and triethylamine used in step B1 is 23.6 g:8.6-9.5 g:100 mL:10.1 g.

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

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

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

[0020] As a further technical solution, in step B4, the ratio of the amount 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 formula for the synthesis of the modifier is shown below:

[0022]

[0023] 1. From the perspective of the preparation process: In the process of preparing the modified glass fiber of the present invention, in step B1, diphenylphosphine chloride and anhydrous piperazine undergo a nucleophilic substitution reaction to obtain a primary product, and then the primary product is reacted with 3-chloropropionic acid to obtain a modifier. The modifier can undergo an amidation reaction with the amino group 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 the performance level: The modifier of the present invention contains a benzene ring as a hydrophobic and heat-resistant group, which not only improves the hydrophobicity of the glass fiber, but also enhances the heat resistance of the material. The hydrophobic glass fiber will have better compatibility with the polypropylene matrix and will be easier to disperse in the matrix, greatly improving 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 properties of the material to a certain extent.

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

[0026] Step A1: drying 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: adding the dried polypropylene resin, modified glass fiber, antioxidant, magnesium hydroxide, lubricant and maleic anhydride grafted polypropylene to a high-speed mixer in sequence, mixing the components to obtain a premix;

[0028] Step A3: adding the premix to a twin-screw extruder to melt and blend the components at high temperature; extruding the melt through the twin-screw extruder, and then water-cooling and pelletizing it through a pelletizer; and drying it in an oven to obtain a glass fiber reinforced polypropylene material.

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

[0030] As a further technical solution, the temperature of each section of the twin-screw extruder is set as follows: zone 1 temperature 180-190°C, zone 2 temperature 190-200°C, zone 3 temperature 200-210°C, zone 4 temperature 210-220°C, zone 5 temperature 210-220°C, and die head temperature 200-210°C.

[0031] As a further technical solution, the oven drying temperature is 60-70°C and the drying time is 12-24 hours.

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

[0033] Beneficial effects of the present invention:

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

[0035] 2. Through multi-step chemical modification of glass fiber, the interfacial compatibility between glass fiber and polypropylene matrix is ​​greatly improved, the problems of glass fiber exposure and floating fiber are reduced, and the mechanical properties and heat resistance of the material are significantly improved;

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

[0037] In summary, the polypropylene material prepared by the present invention has mechanical properties, flame retardancy and heat resistance, which solves the core problems faced by traditional glass fiber reinforced polypropylene materials in the automotive industry, such as poor interface compatibility, low flame retardancy efficiency, and insufficient high-temperature performance. It has important application value in the automotive industry. DETAILED DESCRIPTION

[0038] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, the present application is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0039] Throughout the specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these 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 any one or more embodiments or examples.

[0040] Example 1

[0041] Preparation of modified glass fiber:

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

[0043] Step B2, under a nitrogen atmosphere, 28.6g of the initial product, 10.8g of 3-chloropropionic acid and 120mL of dichloromethane were added to a three-necked round-bottom flask in sequence, and stirred for 5min in an ice bath at 0°C. Then, 10.1g 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, the reaction time was 5h, the reaction was completed, filtered, distilled under reduced pressure, and then purified by column chromatography to obtain a modifier;

[0044] Step B3, 5g of alkali-free glass fiber (diameter of 10 μm, length of 3 mm) was placed in an 80 ° C oven and dried for 2h to remove surface moisture and organic pollutants, the dried glass fiber was mixed with 50mL of ethanol aqueous solution, ultrasonicated for 2min, and then added to a three-necked round-bottom flask, and then 3.1g of KH-550 and acetic acid were added to adjust the pH of the solution to 4. The reaction was stirred at room temperature for 6h. After the reaction was completed, it was filtered, ultrasonically cleaned with ethanol solution to remove physically adsorbed unreacted silane, and vacuum dried to obtain silane-modified glass fiber;

[0045] Step B4: Mix 5 g of silane-modified glass fiber with 100 mL of N,N-dimethylformamide, ultrasonically disperse for 5 minutes, add it to a three-necked round-bottom flask, and then add 5.5 g of modifier and 2.3 g of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide as a catalyst. Heat to 50 ° C. and react for 5 hours under stirring. After the reaction is complete, stop heating, filter, ultrasonically clean 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, 23.6g of diphenylphosphine chloride was added to a three-necked round-bottom flask and stirred in an ice bath at 5°C for 10min. Then, 9.5g of anhydrous piperazine was mixed with 100mL of dichloromethane, stirred and dissolved, and then added dropwise to the flask through a constant dropping funnel. After the addition was complete, 10.1g 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, the reaction time was 4h, the reaction was completed, and the mixture was allowed to stand to room temperature, then filtered, the filtrate was added with water and stirred for distillation, filtered, and the filter cake was ultrasonically washed with water several times to obtain the initial product;

[0049] Step B2, under a nitrogen atmosphere, 28.6g of the initial product, 10.8g of 3-chloropropionic acid and 120mL of dichloromethane were added to a three-necked round-bottom flask in sequence, and stirred for 10min in an ice bath at 5°C. Then, 10.1g 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, the reaction time was 6h, the reaction was completed, filtered, distilled under reduced pressure, and then purified by column chromatography to obtain a modifier;

[0050] Step B3, 5g of alkali-free glass fiber (diameter of 15 μm, length of 5 mm) was placed in an oven at 100 ° C. and dried for 4 h to remove surface moisture and organic pollutants. The dried glass fiber was mixed with 50 mL of ethanol aqueous solution, ultrasonicated for 5 min, and then added to a three-necked round-bottom flask. 4.6g of KH-550 and acetic acid were added to adjust the pH of the solution to 5. The reaction was stirred at room temperature for 8 h. After the reaction was completed, it was filtered, ultrasonically cleaned with ethanol solution to remove physically adsorbed unreacted silane, and vacuum dried to obtain silane-modified glass fiber;

[0051] Step B4: Mix 5 g of silane-modified glass fiber with 100 mL of N,N-dimethylformamide, ultrasonically disperse for 10 minutes, add it to a three-necked round-bottom flask, and then add 7.2 g of modifier and 3.5 g of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide as a catalyst. Heat to 60 ° C. and react for 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.

[0052] Example 3

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

[0054] Step A1: drying 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 97 g of dried polypropylene resin, 12 g of modified glass fiber, 2 g of triphenyl phosphite, 9 g of magnesium hydroxide, 0.5 g of erucamide, and 3 g of maleic anhydride-grafted polypropylene, and add them sequentially into a high-speed mixer. Mix at 800 rpm for 5 min to fully and evenly mix the components to obtain a premix.

[0056] Step A3, adding the premix to a twin-screw extruder (the temperature of each section is set as follows: zone 1 temperature 180-190°C, zone 2 temperature 190-200°C, zone 3 temperature 200-210°C, zone 4 temperature 210-220°C, zone 5 temperature 210-220°C, and die head temperature 200-210°C), so that the components are melt-blended at high temperature, and the melt is extruded through the twin-screw extruder, water-cooled and pelletized by a pelletizer, and dried in an oven at 60°C for 12 hours to obtain a glass fiber reinforced polypropylene material.

[0057] Example 4

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

[0059] Step A1: drying the polypropylene resin, the modified glass fiber prepared in Example 1, trisnonylphenyl 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 108 g of dried polypropylene resin, 18 g of modified glass fiber, 3 g of trinonylphenyl phosphite, 12 g of magnesium hydroxide, 0.75 g of oleamide, and 4 g of maleic anhydride-grafted polypropylene, and add them sequentially into a high-speed mixer, and mix them at 1000 r / min for 10 min to fully and evenly mix the components to obtain a premix;

[0061] Step A3, adding the premix to a twin-screw extruder (the temperature of each section is set as follows: zone 1 temperature 180-190°C, zone 2 temperature 190-200°C, zone 3 temperature 200-210°C, zone 4 temperature 210-220°C, zone 5 temperature 210-220°C, and die head temperature 200-210°C), so that the components are melt-blended at high temperature, and the melt is extruded through the twin-screw extruder, water-cooled and pelletized by a pelletizer, and dried in an oven at 70°C for 24 hours to obtain a glass fiber reinforced polypropylene material.

[0062] Example 5

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

[0064] Step A1: drying the polypropylene resin, the modified glass fiber prepared in Example 1, trisnonylphenyl 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, weighing 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, adding them in sequence to a high-speed mixer, mixing at 1200r / min for 10min, so that the components are fully and evenly mixed to obtain a premix;

[0066] Step A3, adding the premix to a twin-screw extruder (the temperature of each section is set as follows: zone 1 temperature 180-190°C, zone 2 temperature 190-200°C, zone 3 temperature 200-210°C, zone 4 temperature 210-220°C, zone 5 temperature 210-220°C, and die head temperature 200-210°C), so that the components are melt-blended at high temperature, and the melt is extruded through the twin-screw extruder, water-cooled and pelletized by a pelletizer, and dried in an oven at 70°C for 24 hours to obtain a glass fiber reinforced polypropylene material.

[0067] Comparative Example 1

[0068] 24 g of unmodified alkali-free glass fiber was used to replace the modified glass fiber in Example 5, and the remaining steps were the same as in Example 5 to prepare a polypropylene material.

[0069] Comparative Example 2

[0070] Use unmodified ordinary polypropylene material.

[0071] In order to verify the effect of the scheme of the present invention on the performance of the polypropylene material, the polypropylene materials obtained in Examples 3, 4, 5 and the comparative example were tested. The test method is as follows. The test results are shown in Table 1.

[0072] Determination of limiting oxygen index, in accordance with GB / T 2406.2-2009 standard;

[0073] Determine tensile strength according to GB / T 1040.2-2022;

[0074] Determination of flexural strength according to GB / T 9341-2008 standard;

[0075] Determine the heat deformation temperature in accordance with GB / T 1634.2-2019;

[0076] Table 1

[0077]

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

[0079] The above contents are merely examples and explanations of the present invention. Any modifications or additions made by those skilled in the art to the described specific embodiments, or replacements made in a similar manner, shall fall within the scope of protection of the present invention.

Claims

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

2. A glass fiber reinforced polypropylene material according to claim 1, characterized in that: The modified glass fiber is prepared by the following steps: Step B1: Under a nitrogen atmosphere, diphenylphosphine chloride was added to a flask, stirred, and then anhydrous piperazine and dichloromethane were mixed and added dropwise to the flask. Triethylamine was then added and reacted at 50-60° C. for 3-4 hours. The reaction was completed to obtain a primary product. Step B2: Under a nitrogen atmosphere, the initial product, 3-chloropropionic acid and dichloromethane were added to a flask, stirred, and triethylamine was added dropwise. The reaction was carried out at 60-65° C. for 5-6 hours. The reaction was completed to obtain a modifier; Step B3: Dry the glass fiber, mix it with an ethanol aqueous 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 to obtain silane-modified glass fiber; Step B4: Mix the silane-modified glass fiber with N,N-dimethylformamide, disperse it by ultrasonication, and then add it to a flask. Then, add the modifier and 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide. React at 50-60°C for 5-7h. The reaction is completed to obtain modified glass fiber.

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

4. A glass fiber reinforced polypropylene material according to claim 2, 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.

5. The glass fiber reinforced polypropylene material according to claim 2, 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 fiber diameter of 10-15μm and a length of 3-5mm.

6. The glass fiber reinforced polypropylene material according to claim 2, characterized in that: In step B4, the ratio of the amount of silane-modified glass fiber, N,N-dimethylformamide, modifier, and 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide is 5 g:100 mL:5.5-7.2 g:2.3-3.5 g.

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

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

9. The method for preparing a glass fiber reinforced polypropylene material according to any one of claims 1 to 8, characterized in that: The following steps are involved: The 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.

10. Use of the glass fiber reinforced polypropylene material according to any one of claims 1 to 8 in the automotive industry.

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