Anti-aging high-strength nylon material for automobiles and preparation process of anti-aging high-strength nylon material

Abstract

The invention provides an anti-aging high-strength nylon material for automobiles and a preparation process of the anti-aging high-strength nylon material, and is applicable to the field of polymer composite materials. The material comprises 50%-60% of a nylon matrix material, 30%-40% of glass fibers, 0.3%-0.6% of an antioxidant composition, 0.3%-0.5% of an ultraviolet light absorber, 0.2%-0.4% of a light stabilizer, 0.1%-0.2% of an anti-hydrolysis agent, 0.1%-0.3% of a lubricant and 5%-10% of a flexibilizer. The preparation process comprises the steps of drying of the nylon matrix and the glass fibers, high-speed mixing, twin-screw extrusion, cooling and pelletizing and injection molding, and the tensile strength, the impact strength and the aging resistance of the prepared nylon material are remarkably improved by optimizing the proportion and process parameters. The material is suitable for high-performance application of automobile structural parts, exterior trimming parts and the like, overcomes the defects of the traditional nylon in the aspects of weather resistance, mechanical strength and processability, and provides a high-performance and long-life material choice for the automobile industry.

Description

Technical Field

[0001] The invention relates to the field of preparation of nylon materials, and more specifically to an anti-aging high-strength nylon material for automobiles and a preparation process thereof. Background Art

[0002] Nylon materials (polyamide) have been widely used in the fields of automobiles, electronic appliances, industrial machinery, etc. due to their excellent mechanical properties, wear resistance and self-lubrication. However, in practical applications, nylon materials are prone to aging, especially when exposed to harsh environments such as high temperature, ultraviolet rays and humidity for a long time outdoors, which leads to mechanical property degradation, discoloration, cracking, and affects its service life and stability.

[0003] The anti-aging properties of existing materials are difficult to meet the high requirements of automotive applications. In addition, the anti-aging modification in existing technologies often reduces the mechanical properties of materials, resulting in a decrease in material strength, toughness and other indicators, limiting its use in high-intensity application scenarios such as automobiles. Summary of the invention

[0004] In order to solve the deficiencies of the prior art, an anti-aging high-strength nylon material for automobiles and a preparation process thereof are provided. The specific scheme is as follows:

[0005] An anti-aging high-strength nylon material for automobiles, the material comprising the following components by weight percentage:

[0006] Nylon matrix material: 50-60%;

[0007] Glass fiber: 30-40%;

[0008] Antioxidant composition: 0.3-0.6%; including a primary antioxidant and an auxiliary antioxidant; the primary antioxidant is a hindered phenol antioxidant; the auxiliary antioxidant is a thioether antioxidant;

[0009] Ultraviolet absorber: 0.3-0.5%;

[0010] Light stabilizer: 0.2-0.4%;

[0011] Anti-hydrolysis agent: 0.1-0.2%;

[0012] Lubricant: 0.1-0.3%;

[0013] Toughening agent: 5-10%.

[0014] Furthermore, the amount of the main antioxidant added is 0.2-0.4%; the amount of the auxiliary antioxidant added is 0.1-0.2%;

[0015] Furthermore, the light stabilizer is one or a combination of Tinuvin 770, titanium dioxide, zinc oxide nanoparticles or bisphenol A diglycerol ether.

[0016] Furthermore, the anti-hydrolysis agent is one or a combination of epoxy soybean oil, Cyanox 1790, triisooctyl phosphate or tris(2,4-di-tert-butylphenyl)phosphite.

[0017] Furthermore, the lubricant is one or a combination of zinc stearate, polytetrafluoroethylene or silicone oil.

[0018] Furthermore, the toughening agent is one or a combination of ethylene-propylene-diene monomer copolymer, maleic anhydride grafted polyethylene or acrylonitrile-butadiene-styrene copolymer.

[0019] A preparation process of an anti-aging high-strength nylon material for automobiles, the preparation process comprising the following steps:

[0020] S1: The nylon matrix material is dried at 80-90°C for 4-6 hours, and the glass fiber is dried at 100-110°C for 2-3 hours;

[0021] S2: Mix the nylon matrix material, glass fiber, antioxidant combination, ultraviolet absorber, light stabilizer, anti-hydrolysis agent, lubricant, and toughening agent in a high-speed mixer according to a set ratio for 3 to 5 minutes;

[0022] S3: melt blending in a twin-screw extruder, the extruder screw speed is 100-200 rpm, and the mixing time is controlled to be 2-5 minutes;

[0023] S4: Cool in a 20-30°C water bath and then cut into 3-5 mm particles;

[0024] S5: Injection molding.

[0025] Furthermore, the temperature of the twin-screw extruder in S3 is set as follows: feeding zone: 200-220°C; melting zone: 230-250°C; metering zone: 240-260°C; die zone: 240-260°C.

[0026] Furthermore, the injection molding parameters in S5 are molding in an injection molding machine, with a feeding section temperature of 220-230°C, a compression section temperature of 230-240°C, a metering section temperature of 240-250°C, and a nozzle temperature of 230-240°C; an injection molding pressure of 80-120 MPa, and a cooling time of 10-30 seconds.

[0027] Beneficial effects:

[0028] (1) The present invention achieves significant improvements in the material's anti-aging, environmental resistance and mechanical properties by introducing a composite antioxidant, an anti-hydrolysis agent and a toughening agent into a nylon matrix. The use of a composite antioxidant (including hindered phenol and thioether antioxidants) greatly enhances the material's anti-oxidation and anti-ultraviolet aging capabilities, allowing the material to maintain stable performance and appearance after long-term exposure to harsh environments. The addition of an anti-hydrolysis agent further enhances the material's durability under humid and high humidity conditions, effectively avoiding the problem of performance degradation of traditional nylon materials in high humidity environments. In addition, the optimized addition of a toughening agent significantly improves the material's tensile strength and impact strength, and enhances its overall toughness, enabling it to meet the requirements of automotive structural parts and exterior trims for high strength and durability.

[0029] (2) The present invention optimizes the process parameters of twin-screw extrusion and injection molding to fully utilize the material properties in the production process. According to the precise temperature setting of different temperature zones of the twin-screw extruder, the nylon matrix material and the additive are fully mixed and uniformly melted at each stage, thereby improving the uniformity and stability of the material, and further improving the mechanical properties and aging resistance. DETAILED DESCRIPTION

[0030] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with examples. The examples are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0031] Embodiment 1:

[0032] A preparation process of an anti-aging high-strength nylon material for automobiles:

[0033] Material formula

[0034] Nylon matrix material (PA6): 55wt%

[0035] Glass fiber: 35wt%

[0036] Antioxidant composition: 0.5wt%

[0037] Hindered phenol antioxidant (Irganox 1010): 0.3wt%

[0038] Sulfide antioxidant (DLTP): 0.2wt%

[0039] Ultraviolet absorber (UV-531): 0.4wt%

[0040] Light stabilizer (Tinuvin 770): 0.3wt%

[0041] Anti-hydrolysis agent (triisooctyl phosphate): 0.2wt%

[0042] Lubricant (zinc stearate): 0.2wt%

[0043] Toughener (ethylene-propylene-diene monomer copolymer EPDM): 8wt%

[0044] Preparation process

[0045] S1: The nylon matrix material was dried at 85°C for 5 hours, and the glass fiber was dried at 105°C for 2.5 hours.

[0046] S2: Mix all ingredients in a high-speed mixer according to the set ratio for 4 minutes.

[0047] S3: Melt blending was performed in a twin-screw extruder with a screw speed of 150 rpm and a mixing time of 3 minutes. The temperature was set to:

[0048] Feeding zone: 210℃

[0049] Melting zone: 240℃

[0050] Measuring area: 250℃

[0051] Die area: 250℃

[0052] S4: Cool in a 25°C water bath and cut into 4 mm particles.

[0053] S5: Molding in an injection molding machine, feeding section temperature 225°C, compression section temperature 235°C, metering section temperature 245°C, nozzle temperature 235°C; injection pressure 100 MPa, cooling time 20 seconds.

[0054] Embodiment 2:

[0055] A preparation process of anti-aging high-strength nylon material for automobiles

[0056] Material formula

[0057] Nylon matrix material (PA66): 52wt%

[0058] Glass fiber: 38wt%

[0059] Antioxidant composition: 0.4wt%

[0060] Hindered phenol antioxidant (Irganox 1098): 0.25wt%

[0061] Sulfide antioxidant (DSTDP): 0.15wt%

[0062] Ultraviolet absorber (benzophenone UV-326): 0.3wt%

[0063] Light stabilizer (zinc oxide nanoparticles): 0.2wt%

[0064] Anti-hydrolysis agent (epoxidized soybean oil): 0.15wt%

[0065] Lubricant (polytetrafluoroethylene PTFE): 0.15wt%

[0066] Toughener (maleic anhydride grafted polyethylene PE-g-MAH): 7wt%

[0067] Preparation process

[0068] S1: The nylon matrix material was dried at 88°C for 4.5 hours, and the glass fiber was dried at 108°C for 3 hours.

[0069] S2: Mix all ingredients in a high-speed mixer according to the set ratio for 5 minutes.

[0070] S3: Melt blending was performed in a twin-screw extruder with a screw speed of 180 rpm and a mixing time of 4 minutes. The temperature was set to:

[0071] Feeding zone: 215℃

[0072] Melting zone: 245℃

[0073] Measuring area: 255℃

[0074] Die area: 255℃

[0075] S4: Cool in a 28°C water bath and cut into 3 mm particles.

[0076] S5: Molding in an injection molding machine, feeding section temperature 228°C, compression section temperature 238°C, metering section temperature 248°C, nozzle temperature 238°C; injection pressure 110MPa, cooling time 15 seconds.

[0077] Embodiment 3:

[0078] A preparation process of anti-aging high-strength nylon material for automobiles

[0079] Material formula

[0080] Nylon matrix material (PA6 / 66 blend): 54wt%

[0081] Glass fiber: 34wt%

[0082] Antioxidant composition: 0.6 wt%

[0083] Hindered phenol antioxidant (Irganox 1076): 0.35wt%

[0084] Sulfide antioxidant (DLTP): 0.25wt%

[0085] Ultraviolet absorber (UV-328): 0.5wt%

[0086] Light stabilizer (bisphenol A diglycerol ether): 0.3wt%

[0087] Anti-hydrolysis agent (tris(2,4-di-tert-butylphenyl)phosphite): 0.1wt%

[0088] Lubricant (silicone oil): 0.3wt%

[0089] Toughener (Acrylonitrile-Butadiene-Styrene ABS): 6wt%

[0090] Preparation process

[0091] S1: The nylon matrix material was dried at 90°C for 6 hours, and the glass fiber was dried at 110°C for 2 hours.

[0092] S2: Mix all ingredients in a high-speed mixer according to the set ratio for 3 minutes.

[0093] S3: Melt blending was performed in a twin-screw extruder with a screw speed of 120 rpm and a mixing time of 2.5 minutes. The temperature was set to:

[0094] Feeding zone: 205℃

[0095] Melting zone: 235℃

[0096] Measuring area: 245℃

[0097] Die area: 245℃

[0098] S4: Cool in a 20°C water bath and cut into 5 mm particles.

[0099] S5: Molding in an injection molding machine, feeding section temperature 223°C, compression section temperature 233°C, metering section temperature 243°C, nozzle temperature 233°C; injection pressure 90MPa, cooling time 25 seconds.

[0100] Comparative example: using traditional nylon material

[0101] The nylon materials obtained in Examples 1 to 3 and the comparative example were subjected to performance tests, and the test data are as follows:

[0102]

[0103] It can be seen from the table that the nylon material of the embodiment is enhanced in strength and aging resistance.

[0104] As a further improvement, the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An anti-aging high-strength nylon material for automobiles, characterized in that: The material comprises the following components by weight percentage: Nylon matrix material: 50-60%; Glass fiber: 30-40%; Antioxidant composition: 0.3-0.6%; It includes a main antioxidant and an auxiliary antioxidant; the main antioxidant is a hindered phenol antioxidant; the auxiliary antioxidant is a thioether antioxidant; Ultraviolet absorber: 0.3-0.5%; Light stabilizer: 0.2-0.4%; Anti-hydrolysis agent: 0.1-0.2%; Lubricant: 0.1-0.3%; Toughening agent: 5-10%.

2. The anti-aging high-strength nylon material for automobiles according to claim 1, characterized in that: The addition amount of the main antioxidant is 0.2-0.4%; the addition amount of the auxiliary antioxidant is 0.1-0.2%; 3. The anti-aging high-strength nylon material for automobiles according to claim 1, characterized in that: The light stabilizer is one or a combination of Tinuvin 770, titanium dioxide, zinc oxide nanoparticles or bisphenol A diglycerol ether.

4. The anti-aging high-strength nylon material for automobiles according to claim 1, characterized in that: The anti-hydrolysis agent is one or a combination of epoxy soybean oil, Cyanox 1790, triisooctyl phosphate or tris(2,4-di-tert-butylphenyl)phosphite.

5. The anti-aging high-strength nylon material for automobiles according to claim 1, characterized in that: The lubricant is one or a combination of zinc stearate, polytetrafluoroethylene or silicone oil.

6. The anti-aging high-strength nylon material for automobiles according to claim 1, characterized in that: The toughening agent is one or a combination of ethylene-propylene-diene monomer copolymer, maleic anhydride grafted polyethylene or acrylonitrile-butadiene-styrene copolymer.

7. A process for preparing an anti-aging high-strength nylon material for automobiles, characterized in that: The preparation process comprises the following steps: S1: The nylon matrix material is dried at 80-90°C for 4-6 hours, and the glass fiber is dried at 100-110°C for 2-3 hours; S2: Mix the nylon matrix material, glass fiber, antioxidant combination, ultraviolet absorber, light stabilizer, anti-hydrolysis agent, lubricant, and toughening agent in a high-speed mixer according to a set ratio for 3 to 5 minutes; S3: melt blending in a twin-screw extruder, the extruder screw speed is 100-200 rpm, and the mixing time is controlled to be 2-5 minutes; S4: Cool in a 20-30°C water bath and then cut into 3-5 mm particles; S5: Injection molding.

8. The process for preparing an anti-aging high-strength nylon material for automobiles according to claim 7, characterized in that: The temperature of the twin-screw extruder in S3 is set as follows: feeding zone: 200-220°C; Melting zone: 230~250℃; metering zone: 240~260℃; die zone: 240~260℃.

9. The process for preparing an anti-aging high-strength nylon material for automobiles according to claim 7, characterized in that: The injection molding parameters in S5 are molding in an injection molding machine, a feeding section temperature of 220-230°C, a compression section temperature of 230-240°C, a metering section temperature of 240-250°C, and a nozzle temperature of 230-240°C; an injection molding pressure of 80-120 MPa, and a cooling time of 10-30 seconds.

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