A halogen-free flame-retardant semi-aromatic polyamide composite material, its preparation method and application

Abstract

This invention discloses a halogen-free flame-retardant semi-aromatic polyamide composite material, which, by weight, comprises the following components: 40-75 parts of PA5T / X resin; 5-25 parts of halogen-free flame retardant; and 25-60 parts of reflective filler. The main advantage of this invention is that by using a specific weight ratio of titanium dioxide, wollastonite, and hydrotalcite, the composite material achieves a 460nm light reflectance >90% and exhibits resistance to yellowing. This makes the halogen-free flame-retardant semi-aromatic polyamide composite material suitable as a reflective support material for LED light sources.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, and in particular to a halogen-free flame-retardant semi-aromatic polyamide composite material, its preparation method, and its application. Background Technology

[0002] LED light sources mainly consist of semiconductor chips, LED light source reflectors, gold wires, and encapsulating adhesive. The LED light source reflector is the "skeleton" of the LED light source and also a functional component. The LED packaging process involves die bonding, wire bonding, and encapsulating adhesive curing, integrating other materials and components. The LED reflector needs to reflect the light emitted by the LED chip at a specific angle to reduce light loss, and then, through encapsulation materials such as epoxy resin or silicone, form the light source for LED lighting or displays. The material of the LED reflector is a core material in LED lighting, directly affecting the performance and lifespan of the LED light source. Generally, current LED chips emit light with a wavelength of 460nm; therefore, the higher the reflectivity of the material for light in the 460nm band, the more advantageous it is for use in LED light reflectors.

[0003] Currently, in LED lighting and LED display applications, the increasing power of LED chips and the growing size of LED display screens place higher demands on the safety and reliability of light sources. Outdoor lighting sources and LED chips, in particular, age faster due to high temperatures, rain, and thermal shock. In humid climates, rain and dew can easily penetrate LED fixtures, causing short circuits in electronic components and potentially leading to fires. Therefore, the fire resistance requirements for LED light source bracket materials are becoming increasingly stringent. However, currently available LED reflector bracket materials are still not fireproof and do not meet the UL94 V-0 flame retardant standard.

[0004] Because the LED bracket material with added flame retardants has low initial reflectivity and poor resistance to yellowing, it seriously affects the brightness and aging performance of the LED light source. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned technical defects and provide a halogen-free flame-retardant semi-aromatic polyamide composite material with high flame retardancy, high 460nm light emissivity, and good yellowing resistance, as well as its preparation method and application.

[0006] This invention is achieved through the following technical solution:

[0007] A halogen-free flame-retardant semi-aromatic polyamide composite material, comprising the following components by weight:

[0008] 40-75 parts of PA5T / X resin;

[0009] 5-25 parts of halogen-free flame retardant;

[0010] 25-60 parts of reflective filler;

[0011] The reflective pigment is selected from titanium dioxide: wollastonite: hydrotalcite in a weight ratio of (8-21):(5-12):1;

[0012] The PA5T / X resin, based on the PA5T / X molar percentage, has a 5T unit content of 40-70 mol% and an X unit content of 30-60 mol%, and the X unit is not 5T; wherein the X unit is composed of a diacid unit and a diamine unit, the diacid unit being selected from at least one of terephthalic acid unit, isophthalic acid unit, 1,6-adipic acid unit, and 1,10-decanoic acid unit, and the diamine unit being selected from at least one of 1,5-pentanediamine, 1,6-hexanediamine, 1,9-nonanediamine, 2-methyl-1,5-pentanediamine, 2-methyl-1,8-octanediamine, 1,10-decanediamine, and 1,12-dodecanediamine unit;

[0013] The halogen-free flame-retardant semi-aromatic polyamide composite material, measured by differential scanning calorimetry, showed a crystallization peak half-width ΔT1 / 2 of 4-15℃ after a single heating to 350℃ followed by a cooling rate of 20℃ / min.

[0014] Preferably, the weight ratio of titanium dioxide: wollastonite: hydrotalcite is (10-15): (7-10): 1.

[0015] The halogen-free flame retardant is selected from at least one of aluminum diethylphosphinate, zinc diethylphosphinate, aluminum methyl ethylphosphinate, aluminum ethyl butylphosphinate, and aluminum ethylhexylphosphinate; preferably, the halogen-free flame retardant is selected from aluminum diethylphosphinate.

[0016] Preferably, the PA5T / X resin has a 5T unit content of 50-60 mol% and an X unit content of 40-50 mol%.

[0017] The PA5T / X resin is selected from at least one of PA5T / 6T, PA5T / 9T, PA5T / 10T, PA5T / 12T, PA5T / 56, PA5T / 510, and PA5T / 5I.

[0018] The PA5T / X resin of this invention can be a commercially available product, or it can be synthesized according to the following method:

[0019] (1) Prepolymerization: The polymerization monomers, end-capping agent benzoic acid, and deionized water were added to a stainless steel high-pressure reactor equipped with a mechanical stirrer. After evacuation and replacement with N2 three times, the temperature was raised to 180°C at a rate of 5°C / min and held at that temperature for 60 min. Then, the temperature was raised to 270°C at a rate of 2°C / min and slowly stirred and held at that temperature for 4 h to allow the prepolymerization reaction to proceed fully. After the holding temperature was reached, the temperature was slowly raised to 280°C, and the pressure was drained to atmospheric pressure. When the pressure dropped to atmospheric pressure, the drain valve was closed, the reaction was completed, and the product was discharged at room temperature.

[0020] (2) Solid-phase viscosity enhancement: The material prepared in the prepolymerization process is put into a vacuum drum with a drum speed of 10 r / min and a vacuum degree of 30 Pa. The temperature is increased at a rate of 20℃ / min. When the temperature reaches 265℃, a sample is taken to test the viscosity. The discharge endpoint is determined based on the viscosity result.

[0021] The number-average molecular weight range of PA5T / X resin that can achieve the purpose of this invention is 1000-30000.

[0022] Experiments have shown that the average particle size range of the titanium dioxide and hydrotalcite that can achieve the purpose of this invention is 0.09-0.62 micrometers. Preferably, the average particle size range of the titanium dioxide and hydrotalcite is 0.15-0.35 micrometers, and more preferably 0.20-0.30 micrometers. The average diameter of the wollastonite is 4-20 μm, and the average length is 10-250 μm. Preferably, the average diameter is 6-13 μm, and the average length is 60-120 μm.

[0023] The product also includes 0-2 parts by weight of additives, wherein the additives are selected from at least one of antioxidants and lubricants.

[0024] The halogen-free flame-retardant semi-aromatic polyamide composite material of the present invention has a 460nm light reflectance >90%.

[0025] The preparation method of the halogen-free flame-retardant semi-aromatic polyamide composite material of the present invention includes the following steps: according to the formula, the components are mixed evenly, and granulated by extrusion through a twin-screw extruder, with the screw temperature range of 280-330℃ and the rotation speed of 400-500r / min, to obtain the halogen-free flame-retardant semi-aromatic polyamide composite material.

[0026] The application of the halogen-free flame-retardant semi-aromatic polyamide composite material of the present invention is used to prepare LED light source reflector brackets and outdoor LED display light source reflector brackets.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] In existing technologies, halogen-free flame retardants easily cause polyamide composites to yellow. This invention addresses this issue by using a specific weight ratio of titanium dioxide, wollastonite, and hydrotalcite. Wollastonite and hydrotalcite synergistically react with the selected flame retardant, reducing the amount of flame retardant needed and thus improving light reflectivity. A specific amount of hydrotalcite absorbs acidic substances in the flame retardant, improving yellowing resistance. Simultaneously, the compound filler, in conjunction with a PA5T / X resin with a specific repeating unit structure, not only achieves a half-width at half-maximum (HWHM) ΔT1 / 2 of 4-15°C for the halogen-free flame-retardant semi-aromatic polyamide composite, avoiding the influence of the flame retardant on the molding cycle, but also provides better yellowing resistance under the system of this invention, improving both initial light reflectivity and yellowing resistance. This results in a 460nm light reflectivity >90% for the composite material, along with yellowing resistance and V-0 flame retardancy, making the halogen-free flame-retardant semi-aromatic polyamide composite material suitable as a material for LED light source reflector supports. Detailed Implementation

[0029] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention. These all fall within the scope of protection of the present invention.

[0030] The raw materials used in this invention are sourced from the following sources:

[0031] PA5T / 6T-A: 5T unit content 40mol%, 6T unit content 60mol%, number average molecular weight 8834, self-made;

[0032] PA5T / 6T-B: 5T unit content 50 mol%, 6T unit content 50 mol%, number average molecular weight 9138, self-made;

[0033] PA5T / 6T-C: 5T unit content 60mol%, 6T unit content 40mol%, number average molecular weight 8410, self-made;

[0034] PA5T / 6T-D: 5T unit content 70mol%, 6T unit content 30mol%, number average molecular weight 8675, self-made;

[0035] PA5T / 6T-E: 5T unit content 30mol%, 6T unit content 70mol%, number average molecular weight 9355, self-made;

[0036] PA5T / 6T-F: 5T unit content 80mol%, 6T unit content 20mol%, number average molecular weight 8328, self-made;

[0037] PA5T / 9T: 5T unit content 40mol%, 9T unit content 60mol%, number average molecular weight 12600, self-made;

[0038] PA5T / 10T: 5T unit content 40mol%, 10T unit content 60mol%, number average molecular weight 5377, self-made;

[0039] PA5T / 12T: 5T unit content 40mol%, 12T unit content 60mol%, number average molecular weight 18772, self-made;

[0040] PA5T / 56: 5T unit content 40 mol%, 56 unit content 60 mol%, number average molecular weight 23180, self-made;

[0041] PA5T / 510-A: 5T unit content 40mol%, 510 unit content 60mol%, number average molecular weight 11350, self-made;

[0042] PA5T / 510-B: 5T unit content 50 mol%, 510 unit content 50 mol%, number average molecular weight 12722, self-made;

[0043] PA5T / 510-C: 5T unit content 60 mol%, 510 unit content 40 mol%, number average molecular weight 12005, self-made;

[0044] PA5T / 510-D: 5T unit content 70 mol%, 510 unit content 30 mol%, number average molecular weight 11907, self-made;

[0045] PA5T / 510-E: 5T unit content 30mol%, 510 unit content 70mol%, number average molecular weight 12503, self-made;

[0046] PA5T / 510-F: 5T unit content 80 mol%, 510 unit content 20 mol%, number average molecular weight 11554, self-made;

[0047] Number-average molecular weight: The weight-average molecular weight (Mw) and number-average molecular weight (Mn) of PA5T / X resin samples were determined by gel permeation chromatography (GPC). An Agilent HPLC-1260 high-performance liquid chromatograph was used, equipped with an Eppendorf column oven, Shodex KF-801, 802, 802.5, and 803 gel permeation columns, a differential detector, and a G7129A autosampler. Hexafluoroisopropanol was used as the mobile phase, and the molecular weight of the resin was determined at a column temperature of 40 °C. The number-average molecular weight distribution (Mn) was obtained by data processing using the CIRRURS software on a chromatography workstation.

[0048] The wollastonite used in this invention was obtained through screening after being purchased commercially, resulting in the required range of average diameter and average length.

[0049] Wollastonite A: Average diameter is 17 μm, average length is 180 μm;

[0050] Wollastonite B: Average diameter is 8 μm, average length is 110 μm;

[0051] Wollastonite C: Average diameter is 4 μm, average length is 60 μm;

[0052] Wollastonite D: Average diameter is 20 μm, and average length is 210 μm.

[0053] Titanium dioxide was purchased from Longbai Group, and hydrotalcite was purchased from Kanggaote New Materials Technology Co., Ltd. The raw materials with the required average particle size were obtained through screening.

[0054] Titanium dioxide A: Average particle size 0.16 micrometers;

[0055] Titanium dioxide B: Average particle size 0.21 micrometers;

[0056] Titanium dioxide C: Average particle size 0.30 micrometers;

[0057] Titanium dioxide D: Average particle size 0.35 micrometers;

[0058] Titanium dioxide E: Average particle size 0.11 micrometers;

[0059] Titanium dioxide F: Average particle size 0.51 micrometers;

[0060] Hydrotalcite A: Average particle size 0.15 micrometers;

[0061] Hydrotalcite B: Average particle size 0.20 micrometers;

[0062] Hydrotalcite C: Average particle size 0.28 micrometers;

[0063] Hydrotalcite D: Average particle size 0.34 micrometers;

[0064] Hydrotalcite E: Average particle size 0.09 micrometers;

[0065] Hydrotalcite F: Average particle size 0.62 micrometers;

[0066] Aluminum diethylphosphinic acid: purchased from Clariant, Exolit OP1230.

[0067] Antioxidant: Irganox 1098, hindered phenolic antioxidant.

[0068] Preparation method of semi-aromatic polyamide molding composite material in the examples and comparative examples: According to the formula, the components are mixed evenly and extruded and granulated by a twin-screw extruder. The screw temperature range is 280-330℃ and the speed is 400-500r / min to obtain halogen-free flame-retardant semi-aromatic polyamide composite material.

[0069] Test methods:

[0070] (1) Reflectance: A test piece with a length of 60 mm, a width of 60 mm, and a thickness of 1 mm was prepared by injection molding of a polyamide molding composition. The reflectance of the test piece to light with a wavelength of 460 nm was measured using a Color Eye 7000A colorimeter.

[0071] (2) Yellowing resistance: The initial L1, a1, b1 values ​​of the test piece were measured using a Color Eye 7000A colorimeter, and the L2, a2, b2 values ​​were measured after 8 hours of thermo-oxidative aging baking at 180℃. The material ΔE was calculated using the following formula, where ΔL=L2-L1, Δa=a2-a1, Δb=b2-b1;

[0072] .

[0073] (3) Half-width at half maximum (HWHM) ΔT1 / 2 of halogen-free flame-retardant semi-aromatic polyamide composite material: Using a differential scanning calorimeter manufactured by NETZSCH, the temperature was increased from 30℃ to 350℃ at a rate of 20℃ / min under a nitrogen atmosphere. After holding at the temperature for 2 min, the temperature was decreased at a rate of 20℃ / min. The temperature at which the crystallization peak appeared was set as the crystallization temperature Tc (℃), and the temperature at which half the peak width was measured was defined as the half-width at half maximum (HWHM) ΔT1 / 2 of the crystallization peak. 1 / 2

[0074] (4) Flame retardancy: vertical burning, measured at 1.6 mm according to UL94 standard.

[0075] Table 1: Content and Test Results of Each Combination in Halogen-Free Flame-Retardant Semi-Aromatic Polyamide Composites from Examples 1-6

[0076] Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 PA5T / 6T-A 53 40 75 53 53 53 Aluminum diethylphosphite 10 5 25 10 10 10 Titanium Dioxide A 20 32 15 22 21 22.7 Wollastonite A 15 24 10 12.5 14.5 13.2 Hydrotalcite A 2 3 1.5 2.5 1.5 1.1 antioxidants 0.5 0.5 0.5 0.5 0.5 0.5 Flame retardancy V-0 V-0 V-0 V-0 V-0 V-0 Crystallization peak full width at half maximum (FWHM) ℃ 5.6 5.9 5.3 5.5 5.4 5.8 Reflectivity R460, % 93.4 94.5 91.0 91.8 92.9 90.8 Yellowing resistance ΔE 3.3 2.2 9.4 5.1 3.1 5.6

[0077] As can be seen from Examples 1-3, the content of flame retardant significantly affects the light reflectance and yellowing resistance of the composite material, while the technical solution of the present invention can limit ΔE to below 10 and achieve R460 reflectance > 90%.

[0078] As can be seen from Examples 1 / 4 / 5 / 6, the preferred weight ratio of titanium dioxide:wollastonite:hydrotalcite not only has higher reflectivity but also better resistance to yellowing.

[0079] Table 2: Content and Test Results of Each Combination in Halogen-Free Flame-Retardant Semi-Aromatic Polyamide Composites from Examples 7-13

[0080] Example 7 Example 8 Example 9 Example 10 Example 11 Example 12 Example 13 PA5T / 6T-B 53 PA5T / 6T-C 53 PA5T / 6T-D 53 PA5T / 9T 53 PA5T / 10T 53 PA5T / 12T 53 PA5T / 56 53 Aluminum diethylphosphite 10 10 10 10 10 10 10 Titanium Dioxide A 20 20 20 20 20 20 20 Wollastonite A 15 15 15 15 15 15 15 Hydrotalcite A 2 2 2 2 2 2 2 antioxidants 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Flame retardancy V-0 V-0 V-0 V-0 V-0 V-0 V-0 Crystallization peak full width at half maximum (FWHM) ℃ 6.2 8.8 10.3 6.9 8.5 13.2 14.5 Reflectivity R460, % 94.6 94.0 91.9 91.3 91.4 91.3 91.7 Yellowing resistance ΔE 2.5 2.8 6.0 5.2 4.6 4.9 5.3

[0081] Table 3: Content and Test Results of Each Combination in Halogen-Free Flame-Retardant Semi-Aromatic Polyamide Composites from Examples 14-17

[0082] Example 14 Example 15 Example 16 Example 17 PA5T / 510-A 53 PA5T / 510-B 53 PA5T / 510-C 53 PA5T / 510-D 53 Aluminum diethylphosphite 10 10 10 10 Titanium Dioxide A 20 20 20 20 Wollastonite A 15 15 15 15 Hydrotalcite A 2 2 2 2 antioxidants 0.5 0.5 0.5 0.5 Flame retardancy V-0 V-0 V-0 V-0 Crystallization peak full width at half maximum (FWHM) ℃ 12 13.2 14.3 14.9 Reflectivity R460, % 92.0 93.7 94.4 92.4 Yellowing resistance ΔE 7.3 5.9 4.2 6.9

[0083] As can be seen from Examples 1 / 7-17, the preferred PA5T / X resin has a 5T unit content of 50-60 mol% and an X unit content of 40-50 mol%.

[0084] Table 4: Content and Test Results of Each Combination in Halogen-Free Flame-Retardant Semi-Aromatic Polyamide Composites from Examples 18-22

[0085] Example 18 Example 19 Example 20 Example 21 Example 22 PA5T / 6T-A 53 53 53 53 53 Aluminum diethylphosphite 10 10 10 10 10 Titanium Dioxide Selection B C D E F Titanium dioxide content 20 20 20 20 20 Wollastonite selection B C D B B Wollastonite content 15 15 15 15 15 Hydrotalcite Selection B C D E F Hydrotalcite content 2 2 2 2 2 antioxidants 0.5 0.5 0.5 0.5 0.5 Flame retardancy V-0 V-0 V-0 V-0 V-0 Crystallization peak full width at half maximum (FWHM) ℃ 5.2 5.9 6.3 5.1 6.5 Reflectivity R460, % 94.7 94.5 92.4 91.9 91.8 Yellowing resistance ΔE 2.7 3.0 3.9 4.7 5.5

[0086] As can be seen from Examples 1 / 18-22, when the parameters of titanium dioxide, wollastonite, and hydrotalcite are optimized, the reflectivity is higher and the resistance to yellowing is better.

[0087] Table 5: Content and Test Results of Each Combination in Halogen-Free Flame-Retardant Semi-Aromatic Polyamide Composites of Comparative Examples 1-7

[0088] Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 PA5T / 6T-A 53 53 53 PA5T / 6T-E 53 PA5T / 6T-F 53 PA5T / 510-E 53 PA5T / 510-F 53 Aluminum diethylphosphite 10 10 10 10 10 10 10 Titanium Dioxide A 20 20 20 20 22 30 10 Wollastonite A 15 15 15 15 15 6 25 Hydrotalcite A 2 2 2 2 0 1 2 antioxidants 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Flame retardancy V-0 V-0 V-0 V-0 V-0 V-0 V-0 Crystallization peak full width at half maximum (FWHM) ℃ 3.9 16 10.2 17 6.0 5.8 5.6 Reflectivity R460, % 92.0 89.2 91.5 91.3 90.1 89 85 Yellowing resistance ΔE 10.8 12.3 15.1 17.4 19 10 15

[0089] As can be seen from Comparative Examples 1-2, if the unit content of PA5T / 6T is not within the scope of this invention, the half-width at half maximum (WHM) of the crystallization peak is too low or too high. Even if a light reflectance of more than 90% can be obtained, the resistance to yellowing is poor.

[0090] As can be seen from Comparative Example 3, the repeating units of PA5T / 510 are not within the scope of this invention. Even if the full width at half maximum (FWHM) of the crystallization peak is within the scope of this invention, its resistance to yellowing is still insufficient.

[0091] As shown in Comparative Example 4, when the content of 5T unit in PA5T / 510 is too high (80 mol%), the half-maximum width at half maximum (FWHM) of the crystallization peak is too high, resulting in poor resistance to yellowing.

[0092] As can be seen from Comparative Example 5, if it does not contain hydrotalcite, the resistance to yellowing is poor.

[0093] As can be seen from Comparative Examples 6-7, if the proportions of titanium dioxide, wollastonite, and hydrotalcite are outside the range of this invention, the reflectivity and resistance to yellowing are poor.

Claims

1. A halogen-free flame-retardant semi-aromatic polyamide composite material, characterized in that, By weight, it includes the following components: 40-75 parts of PA5T / X resin; 5-25 parts of halogen-free flame retardant; 25-60 parts of reflective filler; The reflective pigment is selected from titanium dioxide: wollastonite: hydrotalcite in a weight ratio of (8-21):(5-12):1; The PA5T / X resin, based on the PA5T / X molar percentage, has a 5T unit content of 40-70 mol% and an X unit content of 30-60 mol%, and the X unit is not 5T; wherein the X unit is composed of a diacid unit and a diamine unit, the diacid unit being selected from at least one of terephthalic acid unit, isophthalic acid unit, 1,6-adipic acid unit, and 1,10-decanoic acid unit, and the diamine unit being selected from at least one of 1,5-pentanediamine, 1,6-hexanediamine, 1,9-nonanediamine, 2-methyl-1,5-pentanediamine, 2-methyl-1,8-octanediamine, 1,10-decanediamine, and 1,12-dodecanediamine unit; The halogen-free flame-retardant semi-aromatic polyamide composite material, measured by differential scanning calorimetry, has a crystallization peak half-width ΔT1 / 2 of 4-15℃ after being heated to 350℃ in one step and then cooled at a rate of 20℃ / min. The average particle size range of the titanium dioxide and hydrotalcite is 0.09-0.62 micrometers; The wollastonite described has an average diameter of 4-20 μm and an average length of 10-250 μm. The halogen-free flame retardant is selected from at least one of aluminum diethylphosphinate, zinc diethylphosphinate, aluminum methyl ethylphosphinate, aluminum ethyl butylphosphinate, and aluminum ethylhexylphosphinate.

2. The halogen-free flame-retardant semi-aromatic polyamide composite material according to claim 1, characterized in that, Titanium dioxide:wollastonite:hydrotalcite weight ratio = (10-15):(7-10):

1.

3. The halogen-free flame-retardant semi-aromatic polyamide composite material according to claim 1, characterized in that, The halogen-free flame retardant is selected from aluminum diethylphosphonate.

4. The halogen-free flame-retardant semi-aromatic polyamide composite material according to claim 1, characterized in that, The PA5T / X resin has a 5T unit content of 50-60 mol% and an X unit content of 40-50 mol%.

5. The halogen-free flame-retardant semi-aromatic polyamide composite material according to claim 1, characterized in that, The PA5T / X resin is selected from at least one of PA5T / 6T, PA5T / 9T, PA5T / 10T, PA5T / 12T, PA5T / 56, PA5T / 510, and PA5T / 5I.

6. The halogen-free flame-retardant semi-aromatic polyamide composite material according to claim 1, characterized in that, The average particle size range of the titanium dioxide and hydrotalcite is 0.15-0.35 micrometers; the average diameter of the wollastonite is 6-13 μm and the average length is 60-120 μm.

7. The halogen-free flame-retardant semi-aromatic polyamide composite material according to claim 1, characterized in that, The average particle size range of the titanium dioxide and hydrotalcite is 0.20-0.30 micrometers.

8. The halogen-free flame-retardant semi-aromatic polyamide composite material according to claim 1, characterized in that, The product also includes 0-2 parts by weight of additives, wherein the additives are selected from at least one of antioxidants and lubricants.

9. The halogen-free flame-retardant semi-aromatic polyamide composite material according to any one of claims 1-8, characterized in that, The 460nm light reflectance of the halogen-free flame-retardant semi-aromatic polyamide composite material is >90%.

10. A method for preparing the halogen-free flame-retardant semi-aromatic polyamide composite material according to any one of claims 1-8, characterized in that, The process includes the following steps: mixing the components evenly according to the formula, and granulating them by extrusion through a twin-screw extruder to obtain a halogen-free flame-retardant semi-aromatic polyamide composite material.

11. The application of the halogen-free flame-retardant semi-aromatic polyamide composite material according to any one of claims 1-8, characterized in that, Used to manufacture LED light source reflector brackets.

12. The application of the halogen-free flame-retardant semi-aromatic polyamide composite material according to any one of claims 1-8, characterized in that, Used to manufacture light source reflector brackets for outdoor LED displays.