Weather-resistant glass fiber reinforced polyamide material and preparation method and application thereof

Abstract

The application relates to the technical field of high polymer materials, in particular to a weather-resistant glass fiber reinforced polyamide material and a preparation method and application thereof. The material comprises, in mass parts, 60-65 parts of polyamide 6 resin, 28-32 parts of glass fiber, 2-2.5 parts of zirconium-aluminum coated rutile type TiO2, 0.3-0.6 parts of ultraviolet light absorber, 0.5-0.7 parts of light stabilizer, 0.5-0.8 parts of antioxidant, 3-5 parts of toughening agent, 0.15-0.8 parts of color powder and 0.1-0.3 parts of lubricant. The application realizes gradient protection of the whole process of photo-oxidative aging of the polyamide 6 material through a triple synergistic protection mechanism of a physical shielding layer, an ultraviolet light absorbing layer and a free radical quenching layer; and the mechanical properties and impact resistance of the material are obviously improved through precise proportioning of the toughening agent and the weather-resistant additive system.

Description

Technical Field

[0001] This invention relates to the field of modified polyamide composite materials, and particularly to a weather-resistant glass fiber reinforced polyamide material, its preparation method, and its application. Background Technology

[0002] With the continuous advancement of the automotive lightweighting industry, glass fiber reinforced polyamide materials, with their advantages of high specific strength, good processability, and controllable overall cost, have gradually replaced metal materials and are widely used in exterior components such as car door handles, rearview mirror housings, and body trim strips. Currently, OEMs are increasingly demanding higher stability requirements for automotive exterior components during long-term outdoor use, requiring materials to maintain stable gloss, color, and mechanical properties even after prolonged exposure to high temperatures, strong ultraviolet radiation, and alternating humid and hot environments.

[0003] Ordinary glass fiber reinforced polyamide materials have poor natural weather resistance. After long-term outdoor photo-oxidation aging, they are prone to yellowing, loss of gloss, surface powdering, and exposure of glass fibers. At the same time, their tensile and impact mechanical properties are greatly reduced, which cannot meet the long-life use requirements of high-end automotive exteriors.

[0004] Existing weather-resistant modification schemes for glass fiber reinforced polyamide materials mostly employ simple compounding schemes using additives such as UV absorbers, light stabilizers, and antioxidants. However, these schemes still have many shortcomings in practical applications: single or simple compounding schemes lack a hierarchical protective structure, making them prone to photolysis, migration, and precipitation under high-dose UV irradiation, resulting in a short effective action period and difficulty in supporting high-level weather resistance requirements; at the same time, multi-level synergistic weather-resistant systems are generally not constructed, leading to limited improvement in the material's weather resistance performance; and weather-resistant modification formulas often sacrifice the material's impact toughness and mechanical strength, making it difficult to balance weather resistance, mechanical properties, and stable mass production.

[0005] Therefore, developing a weather-resistant glass fiber reinforced polyamide material that combines long-lasting weather resistance, high strength, and high impact toughness has significant industrial value in meeting the application needs of high-end exterior parts for domestic automakers. Summary of the Invention

[0006] The purpose of this invention is to address the problems of poor weather resistance and significant decrease in mechanical toughness after weather modification of existing glass fiber reinforced polyamide materials, and to provide a weather-resistant glass fiber reinforced polyamide material, its preparation method and application. The weather-resistant glass fiber reinforced polyamide material provided by this invention has the advantages of long-term weather resistance, high strength and high impact toughness.

[0007] To achieve the above objectives, the present invention provides a weather-resistant glass fiber reinforced polyamide material, comprising the following components by weight: 60-65 parts of polyamide 6 resin, 28-32 parts of glass fiber, 2-2.5 parts of zirconium aluminum coated rutile TiO2, 0.3-0.6 parts of ultraviolet light absorber, 0.5-0.7 parts of light stabilizer, 0.5-0.8 parts of antioxidant, 3-5 parts of toughening agent, 0.15-0.8 parts of colorant, and 0.1-0.3 parts of lubricant.

[0008] The weather-resistant glass fiber reinforced polyamide material provided by this invention comprises, by weight parts, 61, 62, or 63 parts of polyamide 6 resin; 30 or 31 parts of glass fiber; 2.2 or 2.3 parts of zirconium aluminum coated rutile TiO2; 0.4 or 0.5 parts of ultraviolet light absorber; 0.6 parts of light stabilizer; 0.55, 0.6, or 0.75 parts of antioxidant; 3.5, 4, or 4.5 parts of toughening agent; 0.3, 0.4, or 0.6 parts of colorant; and 0.15 or 0.2 parts of lubricant.

[0009] In this invention, the relative viscosity of the polyamide 6 resin is preferably 2.8 to 3.2; the glass fiber is preferably alkali-free chopped glass fiber; and the average diameter of the glass fiber is preferably 10 to 13 μm.

[0010] In this invention, the rutile crystal content in the zirconium aluminum coated rutile TiO2 is preferably ≥98%.

[0011] In this invention, the ultraviolet light absorber preferably includes UV-234; the light stabilizer preferably includes light stabilizer 944.

[0012] In this invention, the antioxidant preferably includes antioxidant 1098 and antioxidant PEP-36; the mass ratio of antioxidant 1098 to antioxidant PEP-36 is preferably 0.3~0.5∶0.2~0.3, and can be 0.3∶0.25, 0.3∶0.3, 0.4∶0.2, or 0.5∶0.25.

[0013] In this invention, the toughening agent preferably comprises ethylene-octene copolymer grafted with maleic anhydride; the grafting rate of the ethylene-octene copolymer grafted with maleic anhydride is preferably 0.8% to 1.2%.

[0014] In this invention, the pigment is preferably phthalocyanine blue and / or phthalocyanine green; the phthalocyanine blue is preferably β-crystalline phthalocyanine blue, with pigment index number CI Pigment Blue 15:3 (PB15:3); the phthalocyanine green is preferably perchlorocopper phthalocyanine, with pigment index number CI Pigment Green 7 (PG7); the lubricant preferably includes silicone powder and / or ethylene bis-stearamide.

[0015] This invention provides a method for preparing the above-mentioned weather-resistant glass fiber reinforced polyamide material, comprising the following steps: S1. Mix polyamide 6 resin, zirconium aluminum coated rutile TiO2, ultraviolet light absorber, light stabilizer, antioxidant, toughening agent, colorant, and lubricant to obtain a premix; S2. The premixed material is added from the main feed port of the twin-screw extruder, and the glass fiber is added from the side feed port. After melt blending, extrusion, stranding, cooling and pelletizing, weather-resistant glass fiber reinforced polyamide material is obtained.

[0016] In this invention, in step S1, the polyamide 6 resin is preferably pre-dried, the drying temperature is preferably 100~110℃, the drying time is preferably 4~5h, and the moisture content of the polyamide 6 resin after drying is preferably ≤0.1%.

[0017] In this invention, in S1, the mixing speed is preferably 400~450 rpm, specifically 420 rpm; the mixing time is preferably 6~10 min, specifically 8 min.

[0018] In this invention, in step S2, the length-to-diameter ratio of the twin-screw extruder is preferably 40:1; the barrel processing temperature of the twin-screw extruder is preferably 200~265℃, and the rotational speed of the twin screw is preferably 300~350rpm; as a specific embodiment of this invention, the processing temperature is preferably: zone one temperature 210~215℃, zone two temperature 220~225℃, zone three temperature 230~235℃, zone four temperature 245~250℃, and zone five temperature 250~255℃. The temperature in zone six is ​​250~260℃, and the die head temperature is 260~265℃; the rotational speed of the twin screw is preferably 300~350 rpm, specifically 310 rpm, 320 rpm, 330 rpm, or 340 rpm; the feeding speed of the twin screw extruder is preferably 25~30 rpm, specifically 25 rpm, 26 rpm, or 28 rpm; the vacuum degree of the melt blending is preferably -0.06~-0.08 MPa, specifically -0.07 MPa. This invention also provides the application of the above-mentioned weather-resistant glass fiber reinforced polyamide material in the preparation of automotive exterior parts.

[0019] In this invention, the automotive exterior trim preferably includes automotive door handles, rearview mirror housings, body trim strips, and exterior trim covers.

[0020] The present invention has the following beneficial effects: This invention introduces a zirconium-aluminum coated rutile TiO2 to construct an inorganic physical shielding layer. The rutile TiO2 scatters and reflects ultraviolet light, reducing the amount of ultraviolet light entering the matrix. The zirconium-aluminum coating layer inhibits the catalytic activity of TiO2, reducing the risk of photocatalytic degradation and ensuring the safety of the physical shielding layer. An ultraviolet light absorber absorbs ultraviolet light and converts it into heat energy, further reducing the ultraviolet light energy reaching the resin matrix. A light stabilizer captures and quenches free radicals generated in the resin matrix by a small amount of ultraviolet light, blocking the chain oxidation reaction. This invention's triple synergistic protection mechanism of "physical shielding layer - ultraviolet light absorption layer - free radical quenching layer" achieves gradient protection against the entire photo-oxidative aging process of polyamide 6 materials, significantly improving the long-term weather resistance of the material. Example data shows that the weather-resistant glass fiber reinforced polyamide material of this invention meets the SAE J2527 standard of 2500 kJ / m². 2 Accelerated aging tests showed that the material's grayscale level remained stable at level 4, with no surface cracking, powdering, or exposed glass fiber. Its long-term outdoor appearance stability was significantly better than that of conventional glass fiber reinforced PA6, demonstrating excellent weather resistance.

[0021] This invention, through a rational ratio of glass fiber and toughening agent, imparts excellent impact resistance to the material while ensuring high strength, solving the problem of significant mechanical property degradation often associated with traditional weather-resistant modifications. Example data shows that the weather-resistant glass fiber reinforced polyamide material of this invention achieves a tensile strength of up to 177 MPa, a flexural strength of up to 270 MPa, a flexural modulus of up to 8710 MPa, and a notched impact strength of 10.2 kJ / m² for a simply supported beam. 2 This indicates that it has excellent mechanical properties and impact resistance. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a summary diagram of the tensile strength of the materials obtained in Examples 1-5 and Comparative Examples 1-3; Figure 2 Here is a summary diagram of the bending strength of the materials obtained in Examples 1-5 and Comparative Examples 1-3; Figure 3This is a summary diagram of the flexural modulus of the materials obtained in Examples 1-5 and Comparative Examples 1-3; Figure 4 The notched impact strength diagrams of the materials prepared in Examples 1-5 and Comparative Examples 1-3 are shown. Detailed Implementation

[0024] The present invention will be further described below with reference to embodiments. Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0025] The specifications and parameters of the raw materials used in this invention are shown in Table 1: Table 1. Summary of Raw Materials

[0026] Example 1 This embodiment provides a weather-resistant glass fiber reinforced polyamide material, comprising the following components by weight: 62 parts polyamide 6 resin, 30 parts glass fiber, 2.0 parts zirconium aluminum coated rutile TiO2, 0.4 parts UV-234, 0.5 parts light stabilizer 944, 0.4 parts antioxidant 1098, 0.2 parts antioxidant PEP-36, 4.5 parts POE-g-MAH, 0.3 parts phthalocyanine green powder, and 0.2 parts silicone powder.

[0027] The preparation method of the weather-resistant glass fiber reinforced polyamide material in this embodiment is as follows: S1. Dry polyamide 6 resin in a 110℃ forced-air drying oven for 5 hours until the moisture content is ≤0.1%; accurately weigh polyamide 6 resin, zirconium aluminum coated rutile TiO2, UV-234, light stabilizer 944, antioxidant 1098, antioxidant PEP-36, POE-g-MAH, phthalocyanine green powder, and silicone powder according to the formula, put them into a high-speed mixer, mix at 450 rpm at room temperature for 6 minutes to obtain a premix; S2. The premixed material is fed into a twin-screw extruder (L / D=40:1) through the main feed port, and the glass fiber is fed into the fourth zone through the side feed device. The temperatures of each zone are set as follows: Zone 1 210℃, Zone 2 225℃, Zone 3 235℃, Zone 4 (glass fiber port) 245℃, Zone 5 255℃, Zone 6 260℃, and die head 265℃; the screw speed is set to 320 rpm, the feed speed to 25 rpm, and the vacuum degree to -0.07 MPa; after melt blending, the material is extruded into strips, cooled in a room temperature water bath, dried by an air knife, granulated, sieved, and vacuum-sealed to obtain weather-resistant glass fiber reinforced polyamide material.

[0028] Example 2 This embodiment provides a weather-resistant glass fiber reinforced polyamide material, comprising the following components by weight: The composition includes 60 parts polyamide 6 resin, 32 parts glass fiber, 2.5 parts zirconium aluminum coated rutile TiO2, 0.5 parts UV-234, 0.7 parts light stabilizer 944, 0.3 parts antioxidant 1098, 0.3 parts antioxidant PEP-36, 3.5 parts POE-g-MAH, 0.4 parts phthalocyanine blue powder, and 0.1 parts EBS.

[0029] The preparation method of the weather-resistant glass fiber reinforced polyamide material in this embodiment is as follows: S1. Dry polyamide 6 resin in a 100℃ forced-air drying oven for 5 hours until the moisture content is ≤0.1%; accurately weigh polyamide 6 resin, zirconium aluminum coated rutile TiO2, UV-234, light stabilizer 944, antioxidant 1098, antioxidant PEP-36, POE-g-MAH, phthalocyanine blue powder, and EBS according to the formula, put them into a high-speed mixer, mix at 400 rpm at room temperature for 10 minutes to obtain a premix; S2. The premixed material is fed into a twin-screw extruder (L / D=40:1) through the main feed port, and the glass fiber is fed into the fourth zone through the side feed device. The temperatures of each zone are set as follows: Zone 1 210℃, Zone 2 220℃, Zone 3 235℃, Zone 4 (glass fiber port) 245℃, Zone 5 255℃, Zone 6 260℃, and die head 265℃; the screw speed is set to 330 rpm, the feed speed to 28 rpm, and the vacuum degree to -0.08 MPa; after melt blending, the material is extruded into strips, cooled in a room temperature water bath, dried by an air knife, granulated, sieved, and vacuum-sealed to obtain weather-resistant glass fiber reinforced polyamide material.

[0030] Example 3 This embodiment provides a weather-resistant glass fiber reinforced polyamide material, comprising the following components by weight: The composition includes 63 parts polyamide 6 resin, 28 parts glass fiber, 2.2 parts zirconium aluminum coated rutile TiO2, 0.3 parts UV-234, 0.6 parts light stabilizer 944, 0.5 parts antioxidant 1098, 0.25 parts antioxidant PEP-36, 5.0 parts POE-g-MAH, 0.3 parts phthalocyanine blue powder, 0.3 parts phthalocyanine green powder, 0.15 parts silicone powder, and 0.15 parts EBS.

[0031] The preparation method of the weather-resistant glass fiber reinforced polyamide material in this embodiment is as follows: S1. Dry polyamide 6 resin in a 110℃ forced-air drying oven for 4 hours until the moisture content is ≤0.1%; accurately weigh polyamide 6 resin, zirconium aluminum coated rutile TiO2, UV-234, light stabilizer 944, antioxidant 1098, antioxidant PEP-36, POE-g-MAH, phthalocyanine blue powder, phthalocyanine green powder, silicone powder, and EBS according to the formula, put them into a high-speed mixer, mix at 420 rpm at room temperature for 8 minutes to obtain a premix; S2. The premixed material is fed into a twin-screw extruder (L / D=40:1) through the main feed port, and the glass fiber is fed into the fourth zone through the side feed device. The temperatures of each zone are set as follows: Zone 1 215℃, Zone 2 220℃, Zone 3 230℃, Zone 4 (glass fiber port) 250℃, Zone 5 255℃, Zone 6 250℃, and die head 260℃; the screw speed is set to 300 rpm, the feed speed to 26 rpm, and the vacuum degree to -0.06 MPa; after melt blending, the material is extruded into strips, cooled in a room temperature water bath, dried by an air knife, granulated, sieved, and vacuum-sealed to obtain weather-resistant glass fiber reinforced polyamide material.

[0032] Example 4 This embodiment provides a weather-resistant glass fiber reinforced polyamide material, comprising the following components by weight: The composition includes 65 parts polyamide 6 resin, 30 parts glass fiber, 2.0 parts zirconium aluminum coated rutile TiO2, 0.6 parts UV-234, 0.5 parts light stabilizer 944, 0.4 parts antioxidant 1098, 0.2 parts antioxidant PEP-36, 4.0 parts POE-g-MAH, 0.15 parts phthalocyanine green, and 0.2 parts EBS.

[0033] The preparation method of the weather-resistant glass fiber reinforced polyamide material in this embodiment is as follows: S1. Dry polyamide 6 resin in a 110℃ forced-air drying oven for 4 hours until the moisture content is ≤0.1%; accurately weigh polyamide 6 resin, zirconium aluminum coated rutile TiO2, UV-234, light stabilizer 944, antioxidant 1098, antioxidant PEP-36, POE-g-MAH, phthalocyanine green, and EBS according to the formula, put them into a high-speed mixer, mix at 400 rpm at room temperature for 10 minutes to obtain a premix; S2. The premixed material is fed into the twin-screw extruder (L / D=40:1) through the main feed port, and the glass fiber is fed into the fourth zone through the side feed device. The temperatures of each zone are set as follows: Zone 1 210℃, Zone 2 225℃, Zone 3 235℃, Zone 4 (glass fiber port) 245℃, Zone 5 255℃, Zone 6 260℃, and die head 265℃; the screw speed is set to 310 rpm, the feed speed to 26 rpm, and the vacuum degree to -0.07 MPa; after melt blending, the material is extruded into strips, cooled in a room temperature water bath, dried by an air knife, granulated, sieved, and vacuum-sealed to obtain weather-resistant glass fiber reinforced polyamide material.

[0034] Example 5 This embodiment provides a weather-resistant glass fiber reinforced polyamide material, comprising the following components by weight: The composition includes 61 parts polyamide 6 resin, 31 parts glass fiber, 2.3 parts zirconium aluminum coated rutile TiO2, 0.5 parts UV-234, 0.6 parts light stabilizer 944, 0.3 parts antioxidant 1098, 0.25 parts antioxidant PEP-36, 5.0 parts POE-g-MAH, 0.8 parts phthalocyanine blue powder, and 0.15 parts silicone powder.

[0035] The preparation method of the weather-resistant glass fiber reinforced polyamide material in this embodiment is as follows: S1. Dry polyamide 6 resin in a 110℃ forced-air drying oven for 4 hours until the moisture content is ≤0.1%; accurately weigh polyamide 6 resin, zirconium aluminum coated rutile TiO2, UV-234, light stabilizer 944, antioxidant 1098, antioxidant PEP-36, POE-g-MAH, phthalocyanine blue powder, and silicone powder according to the formula, put them into a high-speed mixer, mix at 400 rpm at room temperature for 10 minutes to obtain a premix; S2. The premixed material is fed into a twin-screw extruder (L / D=40:1) through the main feed port, and the glass fiber is fed into the fourth zone through the side feed device. The temperatures of each zone are set as follows: Zone 1 215℃, Zone 2 225℃, Zone 3 235℃, Zone 4 (glass fiber port) 245℃, Zone 5 250℃, Zone 6 255℃, and die head 265℃; the screw speed is set to 340 rpm, the feed speed to 30 rpm, and the vacuum degree to -0.07 MPa; after melt blending, the material is extruded into strips, cooled in a room temperature water bath, dried by an air knife, granulated, sieved, and vacuum-sealed to obtain weather-resistant glass fiber reinforced polyamide material.

[0036] Comparative Example 1 (Rutile TiO2 without zirconium aluminum coating) This comparative example provides a glass fiber reinforced polyamide material, comprising the following components in parts by mass: 62 parts polyamide 6 resin, 30 parts glass fiber, 0.4 parts UV-234, 0.5 parts light stabilizer 944, 0.4 parts antioxidant 1098, 0.2 parts antioxidant PEP-36, 4.5 parts POE-g-MAH, 0.3 parts phthalocyanine green powder, and 0.2 parts silicone powder.

[0037] The preparation method of the glass fiber reinforced polyamide material in this comparative example is as follows: S1. Dry polyamide 6 resin in a 110℃ forced-air drying oven for 5 hours until the moisture content is ≤0.1%; accurately weigh polyamide 6 resin, UV-234, light stabilizer 944, antioxidant 1098, antioxidant PEP-36, POE-g-MAH, phthalocyanine green powder, and silicone powder according to the formula, put them into a high-speed mixer, and mix at 450 rpm at room temperature for 6 minutes to obtain a premix; S2. The premixed material is fed into a twin-screw extruder (L / D=40:1) through the main feed port, and the glass fiber is fed into the fourth zone through the side feed device. The temperatures of each zone are set as follows: Zone 1 210℃, Zone 2 225℃, Zone 3 235℃, Zone 4 (glass fiber port) 245℃, Zone 5 255℃, Zone 6 260℃, and die head 265℃; the screw speed is set to 320 rpm, the feed speed to 25 rpm, and the vacuum degree to -0.07 MPa; after melt blending, the material is extruded into strips, cooled in a room temperature water bath, dried by an air knife, granulated, sieved, and vacuum-sealed to obtain weather-resistant glass fiber reinforced polyamide material.

[0038] Comparative Example 2 (without toughening agent) This comparative example provides a glass fiber reinforced polyamide material, comprising the following components in parts by mass: 62 parts polyamide 6 resin, 30 parts glass fiber, 2.0 parts zirconium aluminum coated rutile TiO2, 0.4 parts UV-234, 0.5 parts light stabilizer 944, 0.4 parts antioxidant 1098, 0.2 parts antioxidant PEP-36, 0.3 parts phthalocyanine green powder, and 0.2 parts silicone powder.

[0039] The preparation method of the glass fiber reinforced polyamide material in this comparative example is as follows: S1. Dry polyamide 6 resin in a 110℃ forced-air drying oven for 5 hours until the moisture content is ≤0.1%; accurately weigh polyamide 6 resin, zirconium aluminum coated rutile TiO2, UV-234, light stabilizer 944, antioxidant 1098, antioxidant PEP-36, phthalocyanine green powder, and silicone powder according to the formula, put them into a high-speed mixer, mix at 450 rpm at room temperature for 6 minutes to obtain a premix; S2. The premixed material is fed into a twin-screw extruder (L / D=40:1) through the main feed port, and the glass fiber is fed into the fourth zone through the side feed device. The temperatures of each zone are set as follows: Zone 1 210℃, Zone 2 225℃, Zone 3 235℃, Zone 4 (glass fiber port) 245℃, Zone 5 255℃, Zone 6 260℃, and die head 265℃; the screw speed is set to 320 rpm, the feed speed to 25 rpm, and the vacuum degree to -0.07 MPa; after melt blending, the material is extruded into strips, cooled in a room temperature water bath, dried by an air knife, granulated, sieved, and vacuum-sealed to obtain weather-resistant glass fiber reinforced polyamide material.

[0040] Comparative Example 3 (Equal mass replacement of rutile TiO2 without zirconium aluminum coating) This comparative example provides a glass fiber reinforced polyamide material, which differs from Example 1 only in that the zirconium aluminum coated rutile TiO2 is replaced with an equal mass fraction of rutile TiO2.

[0041] Performance testing The weather-resistant glass fiber reinforced polyamide materials prepared in Examples 1-5 and the glass fiber reinforced polyamide materials prepared in Comparative Examples 1-3 were subjected to performance tests, and the test standards are shown in Table 2. Table 2 Performance Testing Standards

[0042] The test results are shown in Table 3 and Figures 1-4 As shown: Table 3 Performance Test Results

[0043] As shown in Table 3, the mechanical strength and weather resistance of the weather-resistant glass fiber reinforced polyamide materials prepared in Examples 1-5 all meet the requirements for use in automotive exterior parts.

[0044] Combined with Table 3 and Figures 1-4 It can be seen that Comparative Example 1 and Comparative Example 3 have similar mechanical properties to Example 1, but their weather resistance is reduced, and their grayscale level is 2, showing slight powdering. This is because Comparative Example 1 did not add zirconium aluminum coated rutile TiO2. After losing the ultraviolet physical shielding layer in terms of weather resistance, the incident ultraviolet light flux increased, and the load on UV-234 and light stabilizer 944 increased, which was insufficient to completely block the photo-oxidation chain reaction, resulting in a decrease in grayscale level from 4 to 2, showing slight powdering. Comparative Example 3, without zirconium aluminum coating, has high photocatalytic activity on the rutile TiO2 surface. Under ultraviolet excitation, it generates active oxygen species, which accelerates the oxidative degradation of the PA6 matrix and consumes light stabilizer and antioxidant, resulting in a decrease in grayscale level.

[0045] Comparative Example 2 (without POE-g-MAH): The increased proportion of glass fiber in the system led to improved tensile strength, flexural strength, and flexural modulus. However, due to the loss of the toughening mechanism that induces matrix shear yielding through elastomer particle cavitation, the notched impact strength decreased from 9.5 kJ / m. 2 Reduced to 6.8 kJ / m 2 .

[0046] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A weather-resistant glass fiber reinforced polyamide material, characterized in that, Based on parts by mass, it includes the following components: The composition includes 60-65 parts polyamide 6 resin, 28-32 parts glass fiber, 2-2.5 parts zirconium aluminum coated rutile TiO2, 0.3-0.6 parts ultraviolet light absorber, 0.5-0.7 parts light stabilizer, 0.5-0.8 parts antioxidant, 3-5 parts toughening agent, 0.15-0.8 parts colorant, and 0.1-0.3 parts lubricant.

2. The weather-resistant glass fiber reinforced polyamide material according to claim 1, characterized in that, The relative viscosity of the polyamide 6 resin is 2.8~3.2; the glass fiber is alkali-free chopped glass fiber.

3. The weather-resistant glass fiber reinforced polyamide material according to claim 1, characterized in that, The rutile crystal content in the zirconium aluminum coated rutile TiO2 is ≥98%.

4. The weather-resistant glass fiber reinforced polyamide material according to claim 1, characterized in that, The ultraviolet light absorber includes UV-234; the light stabilizer includes light stabilizer 944.

5. The weather-resistant glass fiber reinforced polyamide material according to claim 1, characterized in that, The antioxidants include antioxidant 1098 and antioxidant PEP-36; the mass ratio of antioxidant 1098 to antioxidant PEP-36 is 0.3~0.5:0.2~0.

3.

6. The weather-resistant glass fiber reinforced polyamide material according to claim 1, characterized in that, The toughening agent comprises ethylene-octene copolymer grafted with maleic anhydride.

7. The weather-resistant glass fiber reinforced polyamide material according to claim 1, characterized in that, The colorant includes phthalocyanine blue and / or phthalocyanine green; the lubricant includes silicone powder and / or ethylene bis-stearamide.

8. The method for preparing the weather-resistant glass fiber reinforced polyamide material according to any one of claims 1 to 7, characterized in that, Includes the following steps: S1. Mix polyamide 6 resin, zirconium aluminum coated rutile TiO2, ultraviolet light absorber, light stabilizer, antioxidant, toughening agent, colorant, and lubricant to obtain a premix; S2. The premixed material is added from the main feed port of the twin-screw extruder, and the glass fiber is added from the side feed port. After melt blending, extrusion, stranding, cooling and pelletizing, weather-resistant glass fiber reinforced polyamide material is obtained.

9. The method for preparing the weather-resistant glass fiber reinforced polyamide material according to claim 8, characterized in that, The barrel processing temperature of the twin-screw extruder is 200~265℃, and the rotation speed of the twin screws is 300~350rpm.

10. The application of the weather-resistant glass fiber reinforced polyamide material according to any one of claims 1 to 7 in the preparation of automotive exterior parts; the automotive exterior parts include automotive door handles, rearview mirror housings, body trim strips, and exterior trim covers.

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