Anti-aging glass fiber modified polypropylene material as well as preparation method and application thereof

Abstract

The invention relates to the technical field of high polymer materials, in particular to an anti-aging glass fiber modified polypropylene material and a preparation method and application thereof, and the anti-aging glass fiber modified polypropylene material comprises polypropylene resin, glass fibers, an organic silane coupling agent, a compound stabilizer and a lubricant. The interface bonding force is enhanced through the organic silane coupling agent, and the aging reaction of free radicals is inhibited by utilizing the compound stabilizer, so that the mechanical property and the aging resistance of the material are remarkably improved. After 1000 hours of ultraviolet irradiation, the tensile strength retention rate is about 92%, and the flexural modulus retention rate is about 88%. The preparation method is simple, is suitable for large-scale production, can be widely applied to the fields of automobile parts and building materials, has the advantages of environmental protection and recycling, and is excellent in comprehensive performance.

Description

Technical Field

[0001] The present invention belongs to the technical field of polymer materials, and specifically relates to an aging-resistant glass fiber modified polypropylene material and a preparation method and application thereof. Background Art Polypropylene (PP) is a widely used thermoplastic resin with the chemical formula (C3H6)n. It exhibits excellent mechanical properties, chemical resistance, and low density. However, pure PP is susceptible to the effects of ultraviolet light, oxygen, and high temperatures over long-term use, leading to molecular chain breakage or crosslinking, which in turn triggers material aging. Research has shown that the aging process of PP primarily involves free radical reactions, such as: RH → R• + H• (1) R• + O2 → ROO• (2) ROO• + RH → ROOH + R• (3) The above reaction generates peroxides (ROOH), which further decompose to form carbonyl compounds, affecting the material's mechanical properties and appearance. To improve polypropylene's aging resistance, antioxidants such as phenolic compounds (e.g., C₁₅H₂₄O₂) or light stabilizers such as hindered amines (e.g., C₂₅H₃₈N₂O) are often added. However, these additives can experience migration or precipitation during processing, limiting their long-term stability.

[0002] At the same time, glass fiber reinforcement modification is widely used as an effective method to improve the mechanical strength of polypropylene. Glass fiber, primarily composed of SiO2, has weak interfacial bonding with the polypropylene matrix. Coupling agents such as silane (R-Si(OR')3) are often used to improve interfacial compatibility. However, in high-temperature and humid environments, the interface between the glass fiber and the matrix can still fail due to hydrolysis, thereby affecting the overall performance of the composite material.

[0003] With the growing industrial demand for lightweight, high-performance materials, the development of glass-fiber-modified polypropylene (PP) with both aging resistance and excellent mechanical properties has become a research hotspot. This material must not only address the aging drawbacks of traditional polypropylene but also offer breakthroughs in environmental friendliness and processing performance to meet the demands of modern industrial development. Summary of the Invention According to one aspect of the present invention, an aging-resistant glass fiber-modified polypropylene material is provided. The composite system in this material tightly binds the glass fiber to the polypropylene matrix through chemical bonding. It also incorporates an organosilane coupling agent with free radical scavenging capabilities and a composite stabilizer with antioxidant active groups. Experimental results show that after 1000 hours of UV irradiation, this material maintains approximately 92% of its tensile strength and 88% of its flexural modulus, significantly exceeding the tensile strength retention of 75% and flexural modulus retention of 68% for conventional glass fiber-reinforced polypropylene materials.

[0004] According to one aspect of the present invention, an aging-resistant glass fiber-modified polypropylene material is provided. The material comprises the following components: polypropylene resin, glass fiber, an organosilane coupling agent, a composite stabilizer, and a lubricant. The polypropylene resin has the chemical formula (C3H6)n and a molecular weight range of 100,000 to 300,000. The glass fiber is primarily composed of SiO2, has a diameter of 10 to 15 μm, and a length of 3 to 5 mm. The chemical structure of the organosilane coupling agent is shown in Formula II: R-Si(OR')3, where R is C8H17 or C12H25, and R' is CH3 or C2H5. The composite stabilizer is a mixture of a hindered phenol compound (C15H24O2) and a phosphite compound (C6H15O3P) in a 1:1 mass ratio. The lubricant is selected from calcium stearate or zinc stearate.

[0005] Optionally, the organic silane coupling agent generates a silanol group (-Si-OH) through a hydrolysis reaction, and undergoes a condensation reaction with the hydroxyl group (-OH) on the surface of the glass fiber to form a covalent bond. For example, when R-Si(OR')3 is hydrolyzed, the reaction process is as follows: R-Si(OR')3 + 3H2O → R-Si(OH)3 + 3R'OH (4) R-Si(OH)3 + 3Si-OH (glass fiber surface) → R-Si-O-Si-O-Si + 3H2O (5) Optionally, the hindered phenolic compound in the composite stabilizer inhibits the oxidation chain reaction by capturing free radicals (R•), and the reaction process is as follows: C15H24O2 + R• → C15H23O2• + RH (6) C15H23O2• + O2 → C15H23O2-OO• (7) C15H23O2-OO• + RH → C15H23O2-O-OH + R• (8) Optionally, the phosphite compound inhibits the generation of free radicals by decomposing peroxide (ROOH), and the reaction process is as follows: C6H15O3P + ROOH → C6H15O3P-OH + RO• (9) C6H15O3P-OH + ROOH → C6H15O3P=O + H2O (10) Optionally, during the preparation of the aging-resistant glass fiber-modified polypropylene material, the interfacial bonding between the glass fiber and the polypropylene matrix is enhanced through the bridging effect of an organosilane coupling agent, thereby improving the overall mechanical properties of the composite material. For example, in a tensile test, the material's elongation at break increased from 5% of conventional materials to 12%, and its flexural strength increased from 80 MPa to 120 MPa.

[0006] Optionally, the microstructure of the aging-resistant glass fiber-modified polypropylene material exhibits a uniform dispersion, with the glass fibers aligned along the flow direction within the polypropylene matrix, forming a "fiber network" structure. This structure not only improves the material's rigidity but also enhances its impact resistance. For example, in the Charpy impact test, the material's impact strength is increased from 5 kJ / m² for conventional materials to 10 kJ / m².

[0007] Optionally, the thermal stability of the aging-resistant glass fiber-modified polypropylene material is characterized by differential scanning calorimetry (DSC), with a melting temperature range of 160-170°C and a thermal decomposition temperature of 350±5°C. For example, in thermogravimetric analysis (TGA), the material's mass loss at 300°C is less than 1%, compared to 3% for conventional materials.

[0008] Optionally, the aging performance of the aging-resistant glass fiber-modified polypropylene material under ultraviolet light is evaluated through an accelerated aging test, and the color change ΔE value is less than 2, while the ΔE value of the traditional material is greater than 5. For example, in a xenon lamp aging test, the gloss retention rate of the material is improved from 60% of the traditional material to 85%.

[0009] According to another aspect of the present invention, a method for preparing the aging-resistant glass fiber modified polypropylene material is provided. The method has simple steps, the obtained product has stable performance, and is suitable for large-scale industrial production. Optionally, the method comprises the following steps: (1) uniformly mixing a polypropylene resin and a composite stabilizer in a high-speed mixer to obtain a premix; (2) adding the premix, glass fiber, an organosilane coupling agent, and a lubricant to a twin-screw extruder, and extruding and granulating the premix after melt blending to obtain a modified polypropylene material.

[0010] Optionally, the high-speed mixer has a rotation speed of 500-1000 rpm and a mixing time of 5-10 minutes; the twin-screw extruder has a screw length-to-diameter ratio of 40:1, a processing temperature of 180-220°C, and a screw speed of 200-400 rpm. For example, at a processing temperature of 200°C and a screw speed of 300 rpm, the material's dispersibility and interfacial bonding properties reach optimal levels.

[0011] Optionally, the amount of the organosilane coupling agent is 1-5% by weight of the glass fiber, preferably 2-3%; the amount of the composite stabilizer is 0.5-2% by weight of the polypropylene resin, preferably 1%; and the amount of the lubricant is 0.1-0.5% by weight of the polypropylene resin, preferably 0.3%. For example, when the amount of the organosilane coupling agent is 2% by weight of the glass fiber, the interfacial bonding strength of the material reaches its maximum.

[0012] Optionally, the processing section of the twin-screw extruder is divided into five temperature zones, with the first temperature zone at 180°C, the second temperature zone at 190°C, the third temperature zone at 200°C, the fourth temperature zone at 210°C, and the fifth temperature zone at 220°C. For example, under the above temperature zone settings, the melt index of the material is increased from 5g / 10min of the traditional material to 12g / 10min, significantly improving fluidity.

[0013] According to another aspect of the present invention, there is provided a use of the aforementioned aging-resistant glass fiber-modified polypropylene material in automotive parts and building materials, wherein the material comprises the aforementioned material and / or a material prepared by the aforementioned method; the application areas include automotive bumpers, instrument panel frames, and building formwork. Optionally, when used in automotive bumpers, the material's impact resistance meets the requirements of ISO 6603, with an impact strength greater than 10 kJ / m²; preferably, when used in building formwork, the material's flexural properties meet the requirements of GB / T 9341, with a flexural modulus greater than 5 GPa.

[0014] According to another aspect of the present invention, a method for using the aging-resistant glass fiber-modified polypropylene material in an environmentally friendly industrial product is provided. The material is prepared by recycling waste polypropylene and glass fiber, and its recycling rate can reach over 80%. For example, during the recycling process, the waste polypropylene is crushed, cleaned, and dried, and then mixed with fresh polypropylene resin in a 1:1 mass ratio. The material's overall performance retention rate exceeds 90%.

[0015] The beneficial effects that the present invention can produce include: (1) The present invention provides an aging-resistant glass fiber modified polypropylene material. The material enhances the interfacial bonding force between the glass fiber and the polypropylene matrix through the bridging effect of the organic silane coupling agent, and at the same time inhibits the aging reaction caused by free radicals through the synergistic effect of the composite stabilizer, thereby significantly improving the aging resistance and mechanical properties of the material. For example, after 1000 hours of ultraviolet light irradiation, the tensile strength retention rate of the material is 92%, and the bending modulus retention rate is 88%, which is much higher than that of traditional materials. (2) The present invention provides a high-performance material suitable for automotive parts and building materials. The material not only meets the performance requirements of automobile bumpers and building templates, but also performs well in terms of environmental protection and economy, and has important commercial application value. (3) The present invention provides a preparation method for the above-mentioned aging-resistant glass fiber modified polypropylene material. The method has a simple process, strong equipment versatility, is suitable for large-scale industrial production, and significantly improves the comprehensive performance of the material by optimizing processing parameters. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 Schematic diagram of the microstructure of the aging-resistant glass fiber modified polypropylene material in an embodiment of the present invention, showing the distribution and directional arrangement of the glass fibers in the polypropylene matrix.

[0016] Figure 2 Schematic diagram of the chemical process of the condensation reaction between the organosilane coupling agent and the hydroxyl groups on the surface of the glass fiber in an embodiment of the present invention, with the chemical structures of the reactants and products marked.

[0017] Figure 3 This is a diagram showing the mechanism of action of the composite stabilizer in an embodiment of the present invention in inhibiting free radical oxidation chain reactions, showing the synergistic action pathway of hindered phenol compounds and phosphite compounds.

[0018] Figure 4 This is a schematic diagram of the temperature zone setting and processing flow of a twin-screw extruder in an embodiment of the present invention, indicating the temperature distribution of each temperature zone and the direction of material flow.

[0019] Figure 5 This is a bar chart comparing the performance of the aging-resistant glass fiber modified polypropylene material before and after ultraviolet light irradiation in an embodiment of the present invention, including data on tensile strength retention and flexural modulus retention.

[0020] The accompanying drawings are marked as follows: 1. Glass fiber; 2. Polypropylene matrix; 3. Organic silane coupling agent; 4. Composite stabilizer; 5. First temperature zone; 6. Second temperature zone; 7. Third temperature zone; 8. Fourth temperature zone; 9. Fifth temperature zone; 10. Tensile strength retention rate; 11. Flexural modulus retention rate. DETAILED DESCRIPTION The present invention provides an aging-resistant glass fiber-modified polypropylene material, its preparation method, and its application. Specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The components involved in this embodiment include glass fiber 1, a polypropylene matrix 2, an organosilane coupling agent 3, a composite stabilizer 4, and five temperature zones 5 through 9 of a twin-screw extruder. The connection, positional relationships, and coordination between these components are discussed below.

[0021] First, the connection between the glass fiber 1 and the polypropylene matrix 2 is achieved through the organic silane coupling agent 3 as a bridging substance. Specifically, the chemical structure of the organic silane coupling agent 3 is R-Si(OR')3, where R is C8H17 or C12H25, and R' is CH3 or C2H5. During the hydrolysis reaction, R-Si(OR')3 generates a silanol group -Si-OH, which undergoes a condensation reaction with the hydroxyl -OH on the surface of the glass fiber 1 to form a covalent bond. This process is as follows Figure 2As shown in the figure, the reaction equation is R-Si(OR')3+3H2O→R-Si(OH)3+3R'OH. Subsequently, R-Si(OH)3 further reacts with the hydroxyl groups on the surface of glass fiber 1 to form an R-Si-O-Si-O-Si structure. This chemical bonding significantly enhances the interfacial bonding between glass fiber 1 and polypropylene matrix 2, thereby improving the overall mechanical properties of the composite material.

[0022] Secondly, composite stabilizer 4 is a mixture of hindered phenol compound C15H24O2 and phosphite compound C6H15O3P in a mass ratio of 1:1. Its mechanism of action is as follows Figure 3 As shown in Figure 2, hindered phenolic compounds inhibit the oxidation chain reaction by capturing free radicals R•. The reaction pathway is C15H24O2+R•→C15H23O2•+RH. C15H23O2• then reacts with oxygen to form C15H23O2-OO•, which then reacts with RH to form C15H23O2-O-OH and R•. Simultaneously, phosphites inhibit free radical formation by decomposing peroxides ROOH. The reaction pathway is C6H15O3P+ROOH→C6H15O3P-OH+RO•. C6H15O3P-OH then reacts with ROOH to form C6H15O3P=O and H2O. The synergistic effect of these two compounds effectively inhibits the material's aging process and improves its resistance to UV light.

[0023] During the preparation process, the polypropylene resin and the composite stabilizer 4 are first mixed evenly in a high-speed mixer to obtain a premix. The speed of the high-speed mixer is set to 500-1000 rpm, and the mixing time is 5-10 minutes to ensure that the components are fully dispersed. Subsequently, the premix, glass fiber 1, organosilane coupling agent 3 and lubricant are added to a twin-screw extruder for melt blending. The screw aspect ratio of the twin-screw extruder is 40:1, the processing temperature range is 180-220°C, and the screw speed is 200-400 rpm. The specific temperature zone distribution is as follows Figure 4 As shown, the temperature of the first temperature zone 5 is 180°C, the second temperature zone 6 is 190°C, the third temperature zone 7 is 200°C, the fourth temperature zone 8 is 210°C, and the fifth temperature zone 9 is 220°C. This gradient temperature increase design helps the material to gradually melt and evenly disperse, avoiding performance degradation caused by sudden temperature changes.

[0024] In the twin-screw extruder, the glass fibers 1 are oriented along the flow direction to form a "fiber network" structure, such as Figure 1As shown. This microstructure not only improves the material's rigidity but also enhances its impact resistance. Furthermore, the amount of organosilane coupling agent 3 is 1-5% by mass, preferably 2-3%, of the glass fiber 1; the amount of composite stabilizer 4 is 0.5-2% by mass, preferably 1%, of the polypropylene resin; and the amount of lubricant is 0.1-0.5% by mass, preferably 0.3%. Optimizing these parameters maximizes the material's interfacial bonding strength while ensuring excellent processing properties.

[0025] After preparation, the performance of the resulting material was evaluated through a series of tests. For example, in the tensile test, the elongation at break of the material was increased from 5% of the traditional material to 12%, and the flexural strength was increased from 80MPa to 120MPa. In the Charpy impact test, the impact strength of the material was increased from 5kJ / m² of the traditional material to 10kJ / m². In terms of thermal stability, the melting temperature range of the material was 160-170°C and the thermal decomposition temperature was 350±5°C as characterized by differential scanning calorimetry DSC. Thermogravimetric analysis TGA showed that the mass loss rate of the material at 300°C was less than 1%, while the mass loss rate of the traditional material was 3%. The aging performance under ultraviolet light was evaluated by accelerated aging test. The color change ΔE value of the material was less than 2, while the ΔE value of the traditional material was greater than 5. In the xenon lamp aging test, the gloss retention rate of the material was increased from 60% of the traditional material to 85%. The above performance data are as follows Figure 5 As shown, the bar graph clearly shows the comparative results of the tensile strength retention rate 10 and the flexural modulus retention rate 11.

[0026] In terms of applications, this material can be used in automotive parts and building materials. For example, in automobile bumper applications, the material's impact resistance meets the requirements of ISO 6603, with an impact strength exceeding 10kJ / m². In building formwork applications, the material's flexural properties meet the requirements of GB / T 9341, with a flexural modulus exceeding 5GPa. Furthermore, this material can be produced by recycling waste polypropylene and glass fiber, with a recycling rate exceeding 80%. During the recycling process, the waste polypropylene is crushed, cleaned, and dried, then mixed with fresh polypropylene resin in a 1:1 mass ratio, resulting in a material with a comprehensive performance retention rate exceeding 90%.

[0027] It can be seen from the above embodiment that the covalent bond connection between the glass fiber 1 and the polypropylene matrix 2 is formed by the organic silane coupling agent 3, the composite stabilizer 4 inhibits the generation of free radicals through the chemical reaction path, and the temperature zone setting of the twin-screw extruder ensures the uniform dispersion of the material and the interfacial bonding performance. The mutual coordination relationship between these components jointly achieves the technical goal of the present invention, namely, to provide a glass fiber modified polypropylene material with excellent aging resistance and mechanical properties. In order to better enable relevant personnel in this technical field to fully understand and implement the present invention, the specific implementation principle of the present invention is further supplemented with a specific application scenario below.

[0028] During the bumper manufacturing process, polypropylene resin and composite stabilizer 4 are first premixed in a high-speed mixer at a mass ratio of 100:1. The mixer is set to 800 rpm for 8 minutes to ensure that composite stabilizer 4 is evenly dispersed in the polypropylene resin. This step promotes the physical mixing of the hindered phenol compound C15H24O2 and the phosphite compound C6H15O3P through mechanical shear force and frictional heat, thus forming a premix. The key to this process is to ensure that the active ingredients in composite stabilizer 4 are evenly distributed in the polypropylene matrix 2, allowing the subsequent chemical reaction pathway to proceed smoothly.

[0029] Subsequently, the above premix, glass fiber 1, organosilane coupling agent 3 and calcium stearate lubricant are added to the twin-screw extruder in proportion for melt blending. Among them, the mass fraction of glass fiber 1 is 30%, the amount of organosilane coupling agent 3 is 2.5% of the mass of glass fiber 1, and the amount of lubricant is 0.3% of the mass of polypropylene resin. The screw length-diameter ratio of the twin-screw extruder is 40:1, the processing temperature range is set at 180-220°C, and the screw speed is 300rpm. The specific temperature zone distribution is as follows Figure 4 As shown, the temperature of the first temperature zone 5 is 180°C, which is mainly used for the initial plasticization of the material; the temperature of the second temperature zone 6 is 190°C, which is used to further improve the melt fluidity; the temperature of the third temperature zone 7 is 200°C, which ensures the interface bonding between the glass fiber 1 and the polypropylene matrix 2; the temperature of the fourth temperature zone 8 is 210°C, which is used to promote the hydrolysis and condensation reaction of the organic silane coupling agent 3; the temperature of the fifth temperature zone 9 is 220°C, which completes the final melt blending and extrusion granulation.

[0030] In the twin-screw extruder, the glass fibers 1 are oriented along the flow direction to form a "fiber network" structure, such as Figure 1As shown. The formation of this microstructure mainly depends on the shear force of the screw and the stretching effect during the extrusion process. The glass fiber 1 is subjected to the shear force of the screw in the molten state and gradually oriented along the flow direction, thereby significantly improving the rigidity and impact resistance of the material. At the same time, the organic silane coupling agent 3 undergoes hydrolysis reaction at high temperature to generate silanol groups -Si-OH, and condenses with the hydroxyl -OH on the surface of the glass fiber 1 to form an R-Si-O-Si-O-Si structure, as shown Figure 2 This chemical bonding process significantly enhances the interfacial bonding between the glass fiber 1 and the polypropylene matrix 2, thereby improving the overall mechanical properties of the composite material.

[0031] In terms of the mechanism of action of composite stabilizer 4, the hindered phenol compound C15H24O2 inhibits the oxidation chain reaction by capturing the free radical R•, and its reaction pathway is as follows: Figure 3 Specifically, C15H24O2 reacts with the free radical R• to form C15H23O2• and RH. C15H23O2• then reacts with oxygen to form C15H23O2-OO•, which then reacts with RH to form C15H23O2-O-OH and R•. Simultaneously, the phosphite compound C6H15O3P inhibits free radical formation by decomposing the peroxide ROOH. The reaction pathway is C6H15O3P + ROOH → C6H15O3P-OH + RO•. C6H15O3P-OH then reacts with ROOH to form C6H15O3P=O and H2O. The synergistic effect of these two compounds effectively inhibits the material's aging process and improves its resistance to UV light.

[0032] After preparation, the performance of the resulting material was evaluated through a series of tests. For example, in the tensile test, the material's elongation at break increased from 5% of the traditional material to 12%, and the flexural strength increased from 80 MPa to 120 MPa. This performance improvement is mainly due to the directional arrangement of the glass fiber 1 and the interfacial reinforcement of the organic silane coupling agent 3. In the Charpy impact test, the material's impact strength increased from 5 kJ / m² of the traditional material to 10 kJ / m², which is attributed to the formation of the "fiber network" structure and the effective inhibition of the free radical oxidation chain reaction by the composite stabilizer 4. In addition, thermogravimetric analysis (TGA) showed that the material's mass loss rate at 300°C was less than 1%, while the mass loss rate of the traditional material was 3%. This result shows that the composite stabilizer 4 can effectively protect the polypropylene matrix 2 from thermal oxidative degradation under high temperature conditions.

[0033] In practical applications, this material can be used in the manufacture of automobile bumpers. According to ISO 6603, the material's impact strength must be greater than 10kJ / m². Experimental results show that the material's impact strength reaches 12kJ / m², fully meeting the standard requirements. In addition, in the xenon lamp aging test, the material's gloss retention rate increased from 60% of traditional materials to 85%. Figure 5 This performance improvement is mainly due to the inhibitory effect of composite stabilizer 4 on the generation of free radicals under UV irradiation.

[0034] The above steps demonstrate the covalent bond between glass fiber 1 and polypropylene matrix 2, formed by organosilane coupling agent 3. Composite stabilizer 4 inhibits free radical generation through chemical reaction pathways. The temperature zone settings of the twin-screw extruder ensure uniform dispersion and interfacial bonding. These components work together to achieve the technical objectives of the present invention, namely, to provide a glass fiber-modified polypropylene material with excellent aging resistance and mechanical properties.

Claims

1. An aging-resistant glass fiber modified polypropylene material, characterized in that: The material comprises the following components: polypropylene resin, glass fiber (1), organosilane coupling agent (3), composite stabilizer (4) and lubricant; the chemical formula of the polypropylene resin is (C3H6)n, and the molecular weight ranges from 100,000 to 300,000; the main component of the glass fiber (1) is SiO2, with a diameter of 10 to 15 μm and a length of 3 to 5 mm; the chemical structure of the organosilane coupling agent (3) is R-Si(OR')3, wherein R is C8H17 or C12H25, and R' is CH3 or C2H5; the composite stabilizer (4) is a mixture of a hindered phenol compound and a phosphite compound in a mass ratio of 1:1; and the lubricant is selected from one of calcium stearate and zinc stearate.

2. The aging-resistant glass fiber modified polypropylene material according to claim 1, characterized in that: The organic silane coupling agent (3) generates silanol groups through a hydrolysis reaction and undergoes a condensation reaction with the hydroxyl groups on the surface of the glass fiber (1) to form a covalent bond connection.

3. The aging-resistant glass fiber modified polypropylene material according to claim 1, characterized in that: The chemical formula of the hindered phenol compound in the composite stabilizer (4) is C15H24O2, and the chemical formula of the phosphite compound is C6H15O3P.

4. The aging-resistant glass fiber modified polypropylene material according to claim 1, characterized in that: The amount of the organic silane coupling agent (3) is 1-5% of the mass of the glass fiber (1), the amount of the composite stabilizer (4) is 0.5-2% of the mass of the polypropylene resin, and the amount of the lubricant is 0.1-0.5% of the mass of the polypropylene resin.

5. The aging-resistant glass fiber modified polypropylene material according to claim 1, characterized in that: In the microstructure of the material, glass fibers (1) are directionally arranged in a polypropylene matrix (2) along a flow direction to form a fiber network structure.

6. The aging-resistant glass fiber modified polypropylene material according to claim 1, characterized in that: The melting temperature of the material is in the range of 160-170°C, and the thermal decomposition temperature is 350±5°C.

7. A method for preparing an aging-resistant glass fiber modified polypropylene material, characterized in that: The method comprises the following steps: (1) uniformly mixing polypropylene resin and composite stabilizer (4) in a high-speed mixer to obtain a premix; (2) adding the premix, glass fiber (1), organosilane coupling agent (3) and lubricant into a twin-screw extruder, and extruding and granulating the premix after melt blending to obtain a modified polypropylene material.

8. The preparation method according to claim 7, characterized in that The rotation speed of the high-speed mixer is 500-1000 rpm, and the mixing time is 5-10 minutes; the screw length-diameter ratio of the twin-screw extruder is 40:1, the processing temperature is 180-220° C., and the screw rotation speed is 200-400 rpm.

9. The preparation method according to claim 7, characterized in that The processing section of the twin-screw extruder is divided into five temperature zones, the temperature of the first temperature zone (5) is 180°C, the temperature of the second temperature zone (6) is 190°C, the temperature of the third temperature zone (7) is 200°C, the temperature of the fourth temperature zone (8) is 210°C, and the temperature of the fifth temperature zone (9) is 220°C.

10. Application of an aging-resistant glass fiber modified polypropylene material in automobile parts and building materials, characterized in that: The material is used to make car bumpers, dashboard frames and building formwork.

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