MCA flame-retardant black polyamide composite material capable of high-definition laser marking, preparation method thereof, and application thereof

Abstract

This application discloses an MCA flame-retardant black polyamide composite material capable of high-definition laser marking. The composite material comprises the following components, by weight: 50-74 parts nylon resin; 20-40 parts glass fiber; 5-13 parts MCA flame retardant; 0.1-0.5 parts carbon black; 0.2-0.6 parts lubricant; 0-0.5 parts antioxidant; one or both of PA6 and PA66 with a relative viscosity of 2.0-2.4 for the nylon resin; and an average particle size of 5-10 μm for the MCA. This application selects a low-viscosity nylon resin to ensure excellent processing fluidity. The selected formulation components improve the uneven dispersion problem that occurs when MCA and carbon black are used together, reduce the adverse effects of the MCA lubrication on carbon black dispersibility, and enhance the material's flame retardancy and high CTI performance. This results in improved high-definition black-on-white laser marking performance while maintaining good flame retardancy and high CTI. This application achieves high-definition black-on-white laser marking without the addition of expensive laser marking agents, graphene, etc., resulting in low cost.

Description

Technical Field

[0001] The invention belongs to the field of polymer compositions, and in particular relates to an MCA flame-retardant black polyamide composite material capable of high-definition laser marking, a preparation method and an application thereof. Background Art

[0002] Melamine cyanurate (MCA) flame-retardant polyamide composites offer excellent mechanical properties, high flame retardancy, low smoke density, and a Comparative Tracking Index (CTI) of up to 600V. They are widely used in low-voltage electrical appliances, electronics, and household appliances. In particular, low-voltage electrical appliances and the 5G sector require housing materials with laser marking capabilities.

[0003] Laser marking is a new type of marking technology that uses computer control and has the advantages of fast marking speed, easy operation, environmental protection, and low production cost. It mainly uses a high-energy-density light beam to irradiate the surface of the target object, causing it to undergo physical or chemical changes, thereby obtaining visible text, graphics, symbols, barcodes, or images. At present, halogen-free flame-retardant polyamide composite materials are mainly marked using ultraviolet laser marking machines. Among them, black nitrogen-phosphorus flame-retardant polyamide materials can be used in the 5G1U circuit breaker field due to their good laser marking performance. However, nitrogen-phosphorus flame retardants are expensive, and there is a need for more economical and affordable materials to replace them in the market. MCA is a white crystalline solid, a nitrogen-containing halogen-free environmentally friendly flame retardant, and can also be used as a solid lubricant. It has the advantages of low toxicity, low smoke, and low cost. However, when used in carbon black-modified polyamide composite materials, the marking effect has problems such as yellowing or unclear marking, which limits its application.

[0004] Existing technologies offer two approaches to improving marking performance: graphene masterbatch and high-viscosity resin. However, the graphene masterbatch approach fails to disclose its impact on CTI, and graphene is expensive, leading to high industrial production costs. Some approaches using high-viscosity resins, such as those with relative viscosities of 2.8 or 3.2, fail to demonstrate the flame retardancy of the composite material. Some require the addition of flame retardant synergists and laser marking additives to achieve the claimed improved marking performance. However, high-viscosity resins can lead to poor system fluidity and severe surface fibrillation during injection molding. The addition of other flame retardant synergists and laser marking additives also leads to high composite material costs. Summary of the Invention

[0005] The present invention aims to solve the problems of existing MCA flame-retardant black nylon materials having a dark enough base color and yellow or unclear laser markings. It provides a nylon composite material with high clarity of black-on-white laser markings, high CTI, flame retardancy, mechanical properties, and processability, among other excellent comprehensive properties. This is achieved through the following technical solutions:

[0006] MCA flame retardant black polyamide composite material capable of high-definition laser marking, comprising the following components in parts by weight:

[0007] 50-74 parts of nylon resin;

[0008] 20~40 parts of glass fiber;

[0009] MCA flame retardant 6-10 parts;

[0010] Carbon black 0.1~0.5 parts;

[0011] 0.2~0.6 parts of lubricant;

[0012] Antioxidant 0~0.5 parts;

[0013] The nylon resin has a relative viscosity of 2.0-2.4 and is selected from one or both of PA6 and PA66; and the average particle size of the MCA is 5-10 μm.

[0014] Optionally, the following components are included in parts by weight:

[0015] 50-74 parts of nylon resin;

[0016] 20~40 parts of glass fiber;

[0017] MCA flame retardant 6-10 parts;

[0018] Carbon black 0.1~0.5 parts;

[0019] 0.2~0.6 parts of lubricant;

[0020] Antioxidant 0~0.5 parts.

[0021] Optionally, the ratio of the MCA flame retardant to carbon black is 15:1 to 40:1.

[0022] Optionally, the glass fiber is alkali-free glass fiber.

[0023] Optionally, the carbon black is medium-high pigment carbon black, which can further improve the blackness of the background material and increase the blackness of the material.

[0024] Optionally, the lubricant includes one or more of ethylene bisstearamide, calcium stearate, and modified ethylene bisstearamide.

[0025] Optionally, the antioxidant includes one or more of hindered phenols and phosphites.

[0026] Optionally, the antioxidant is a mixture of antioxidant S 9228 and antioxidant 1098 in a mass ratio of 1:1 to 1:3.

[0027] Optionally, 0.02-0.1 parts by weight of pigment is also included.

[0028] Optionally, the pigment includes one or more of ultramarine blue, cobalt blue, and phthalocyanine blue. As a complementary colorant, the blue pigment can neutralize the yellowing and reddening of the laser marking caused by thermal discoloration of the resin, making the marking tend to be whiter.

[0029] Optionally, the blue pigment is a composite pigment with a mass ratio of ultramarine blue to phthalocyanine blue of 1:1 to 1:3, thereby further improving the material's resistance to high-temperature yellowing during processing.

[0030] The present application also provides a method for preparing any of the above composite material technical solutions, comprising the blending step:

[0031] A: First, melt and shear the components except MCA through a screw extruder to obtain a pre-dispersed system;

[0032] B: MCA was added to the pre-dispersed system and sheared and blended by a screw extruder to obtain a well-dispersed composite melt.

[0033] Optionally, in the blending step: step A and step B are respectively operated at the main feeding port and the side feeding port of the same screw extruder.

[0034] Optionally, in the blending step: step A and step B are respectively performed in different screw extruders.

[0035] The present application also provides an application of any of the above-mentioned composite material technical solutions, which is used in laser marking black and white parts in the low-voltage electrical appliance field and 5G circuit breaker field.

[0036] Compared to existing technologies, this application utilizes a low-viscosity nylon resin to ensure excellent processing fluidity. The selected formulation components also improve the uneven dispersion problem that occurs when MCA and carbon black are combined, reducing the adverse effects of MCA's lubrication on carbon black dispersion and enhancing the material's flame retardancy and high CTI performance. This results in improved high-definition black-on-white laser marking performance while maintaining excellent flame retardancy and high CTI. This application achieves high-definition black-on-white laser marking without the addition of expensive laser marking agents or graphene, resulting in a low-cost solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 These are product examples of Example 1 and Comparative Example 4 when used in low-voltage electrical appliances and 5G1U fields.

[0038] Figure 2 For Example 1 ( Figure 1 Left) and Comparative Example 3 ( Figure 1 Right) Optical microscope photograph of the shell surface. Implementation Method

[0039] The specific implementation methods of the present application are described in detail below through examples, but the specific implementation of the present application does not limit the technical solution of the present application. Any non-substantial changes such as replacing common technical solutions in the field with the technical solutions described in the examples of the present application are within the scope of protection of the present application.

[0040] In the following specific embodiments, the raw materials used are shown below, but this does not limit the source of the products.

[0041] PA6 / CSR / OS Guangdong Xinhui Meida Nylon Co., Ltd. Relative viscosity 1.8

[0042] PA6 / M2000 Guangdong Xinhui Meida Nylon Co., Ltd. Relative viscosity 2.0

[0043] PA6 / M2400 Guangdong Xinhui Meida Nylon Co., Ltd. Relative viscosity 2.4

[0044] PA6 / M2800 Guangdong Xinhui Meida Nylon Co., Ltd. Relative viscosity 2.8

[0045] PA6 / M3200 Guangdong Xinhui Meida Nylon Co., Ltd. Relative viscosity 3.2

[0046] PA66 / EPR24 Shenma Industrial Co., Ltd. Relative viscosity 2.4

[0047] Glass Fiber 560A China Jushi Co., Ltd.

[0048] Flame retardant MCA-F Sichuan Fine Chemical Research and Design Institute Particle size: 6-10 microns

[0049] Flame retardant MCA-12 Sichuan Fine Chemical Research and Design Institute Particle size: 1-3 microns

[0050] Carbon Black BLACK PEARLS 800 Cabot Corporation medium to high pigment carbon black

[0051] Antioxidant 1098 Tianjin Li'anlong New Materials Co., Ltd.

[0052] Antioxidant S9228 Dover Chemical, USA

[0053] Lubricant Calcium Stearate Hangzhou Oil and Fat Chemical Co., Ltd.

[0054] Ultramarine Blue 8008 Wenzhou Baise Fine Pigment Chemical Co., Ltd.

[0055] Phthalocyanine Blue K6907 BASF, Germany

[0056] The components and properties of the embodiments and comparative examples are shown in Table 1 and Table 2, respectively, where the units of each component in the table are parts by weight.

[0057] It should be noted that in each embodiment and comparative example, the antioxidants are 0.2 parts of 1098 and 0.2 parts of S9228, and the lubricant is 0.25 parts of calcium stearate. However, the scope of protection of this application is not limited thereto, and those skilled in the art can make routine adjustments as needed.

[0058] Preparation of resin composition:

[0059] Examples 1 to 12 include the following steps:

[0060] A: First, melt and shear-blend the components except MCA according to the specific examples through a screw extruder to obtain a pre-dispersed system. The pre-dispersed system herein includes a melt, plastic particles, or other processed stock or formed bodies, and does not substantially affect the melt components. B: MCA is added to the pre-dispersed system and shear-blended through a screw extruder to obtain a well-dispersed composite melt. Plastic particles are then prepared through extrusion, cooling, and granulation. Those skilled in the art may also choose to process the plastic particles into other finished or semi-finished products, such as stock or formed bodies, which are equivalent to plastic particles.

[0061] Specifically, in this embodiment, in the blending step: step A and step B are respectively performed in different screw extruders.

[0062] In other embodiments, step A and step B may also be performed at the main feeding port and the side feeding port of the same screw extruder, respectively.

[0063] In the above steps, the aspect ratio of the extruder is 50:1. Specifically, the main engine speed of the extruder is 400-450 rpm, and the temperature of each zone is set to: 40-60°C in zone 1, 210-230°C in zones 2-5, 200-220°C in zones 6-8, and 210-230°C in zones 9-10. Those skilled in the art can select a screw extruder with an aspect ratio in the range of (40:1) to (50:1) according to their needs.

[0064] It should be noted that the basic operations of melting, blending, and extrusion granulation are conventional means used by those skilled in the art in the plastic processing process. The screw combination and process can be set according to the components to be processed and there is no need to elaborate.

[0065] Comparative Example 4: All components were mixed uniformly according to the proportions of each component and added from the main feeding port of a screw extruder. MCA flame-retardant nylon composite material particles were obtained after melt blending and extrusion granulation.

[0066] In the above steps, the aspect ratio of the extruder is 50:1, the main engine speed of the extruder is 400-450 rpm, and the temperature of each zone is set as follows: 40-60°C for zone 1, 210-230°C for zones 2-5, 200-220°C for zones 6-8, and 210-230°C for zones 9-10.

[0067] Comparative Example 8: All components except carbon black were mixed uniformly according to the proportion of each component, added from the main feeding port of a twin-screw extruder, and a carbon black-free MCA flame-retardant nylon composite material was obtained after melt blending and extrusion granulation.

[0068] The dried particles of the carbon black-free MCA flame-retardant nylon composite material and the carbon black are respectively fed into the main feeding port of the twin-screw extruder, and are melt-blended and extruded into granules to obtain the MCA flame-retardant black nylon composite material.

[0069] In the above steps, the aspect ratio of the extruder is 50:1, the main engine speed of the extruder is 400-450 rpm, and the temperature of each zone is set as follows: 40-60°C for zone 1, 210-230°C for zones 2-5, 200-220°C for zones 6-8, and 210-230°C for zones 9-10.

[0070] The preparation methods of the remaining comparative examples refer to Examples 1 to 12.

[0071] The performance characterization and testing methods of composite materials are as follows:

[0072] Preparation of test specimens: The pellets of each embodiment and comparative example were dried in an oven at 110°C for 4-6 hours, and then injected into standard specimens according to the requirements of each standard at 255-265°C for laser marking and other related performance tests. Among them, the laser marking contrast and laser marking effect tests were performed by making laser-marked color plates to test the performance.

[0073] Mechanical properties: Tensile strength is tested in accordance with ISO 527-1: 2012 using a universal material testing machine; Simple supported beam unnotched impact strength is tested in accordance with ISO179-1: 2010 using an electronic impact testing machine;

[0074] Flame retardant performance: Glow wire flammability index (GWFI) is tested in accordance with IEC 60695-11-20:2015 standard, the test temperature is 960℃, and a glow wire tester is used;

[0075] Electrical properties: Comparative tracking index (CTI) is tested according to IEC60112:2009 standard using a tracking tester;

[0076] Thermal properties: Heat deformation temperature (HDT) is tested in accordance with GB / T 1634.1-2019 standard using an automatic Vicat heat deformation tester;

[0077] Laser marking: The UV-3C ultraviolet laser marking machine of Han's Laser Technology Industry Matrix Co., Ltd. was used for laser marking tests, and the marking speed was 800 mm / sec.

[0078] Laser marking contrast ΔL: A Konica Minolta CM-36dG colorimeter was used to measure the color difference between the marked area (L2) and the unmarked area (L1). The contrast was calculated using ΔL = L2 - L1.

[0079] Laser marking effect: visual inspection, the grades are divided into excellent, good, yellowish, reddish yellow, and dark.

[0080] Appearance rating of injection molded products: The floating fibers on the surface of the color plate are observed under an optical microscope and can be divided into 4 grades: Grade 1 is a high appearance smoothness with no floating fibers and agglomeration; Grade 2 is a high appearance smoothness with a small amount of floating fibers but no agglomeration; Grade 3 is a general appearance smoothness with more floating fibers or a small amount of agglomeration; Grade 4 is a poor appearance smoothness with a large amount of floating fibers or a large amount of agglomeration.

[0081] Table 1 Components and properties of Examples 1 to 12

[0082] Components & Performance Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 Example 10 Example 11 Example 12 PA6 / M2000 　 　 　 　 55 47 33 33 　 64 30 　 PA6 / M2400 74 70 54 50 　 　 34 34 63 　 　 　 PA66 / EPR24 　 　 　 　 　 　 　 　 　 　 31 60 PA6 / CSR / OS 　 　 　 　 　 　 　 　 　 　 　 　 PA6M2800 　 　 　 　 　 　 　 　 　 　 　 　 PA6M3200 　 　 　 　 　 　 　 　 　 　 　 　 Glass fiber 560A 20 20 40 40 40 40 25 25 30 30 30 30 Flame retardant MCA-F 6 10 6 10 5 13 8 8 7 6 9 10 Flame retardant MCA-12 　 　 　 　 　 　 　 　 　 　 　 　 carbon black 0.35 0.35 0.35 0.35 0.35 0.35 0.1 0.5 0.35 0.2 0.35 0.35 Lubricant / Calcium Stearate 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 0.25 Antioxidant 1098 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 Antioxidant 9228 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 Ultramarine Blue 8008 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 Phthalocyanine Blue K6907 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 Tensile strength (Mpa) 86 85 109 111 108 112 90 89 95 94 98 105 <![CDATA[Izod impact strength (KJ / m 2 ).]]> 46 44 55 53 44 42 45 47 49 40 35 38 GWFI / 960℃ pass pass pass pass Unstable pass pass pass pass pass pass pass CTI (V) 550 550 550 550 550 550 550 525 550 550 550 550 Heat distortion temperature HDT (℃) 165 167 203 206 201 206 178 182 191 191 202 198 Color difference value L1 of unmarked area 26.6 26.8 26.9 27.1 26.9 27.2 27.4 26.3 26.7 27 26.8 26.81 Marked area color difference value L2 70.6 70.4 70.5 70.3 70 69.7 70.8 68.8 70.4 70.8 70.3 70.31 Laser marking contrast ΔL 44.1 43.6 43.7 43.3 43.1 42.5 43.4 42.5 43.7 43.8 43.5 43.5 Laser marking effect excellent excellent excellent good good good good good excellent excellent excellent excellent Appearance of injection molded products Level 1 Level 1 Level 2 Level 2 Level 2 Level 2 Level 1 Level 1 Level 2 Level 2 Level 2 Level 2

[0083] Table 2 Components and performance test data of Comparative Examples 1 to 13

[0084] Components & Performance Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Comparative Example 8 Comparative Example 9 Comparative Example 10 Comparative Example 11 Comparative Example 12 Comparative Example 13 PA6 / M2000 　 　 　 　 　 　 　 　 64 64 64 　 　 PA6 / M2400 　 　 　 74 74 57 66 74 　 　 　 74 74 PA66 / EPR24 　 　 　 　 　 　 　 　 　 　 　 　 　 PA6 / CSR / OS 50 　 　 　 　 　 　 　 　 　 　 　 　 PA6M2800 　 50 　 　 　 　 　 　 　 　 　 　 　 PA6M3200 　 　 50 　 　 　 　 　 　 　 　 　 　 Glass fiber 560A 40 40 40 20 20 30 30 20 30 30 30 20 20 Flame retardant MCA-F 10 10 10 6 　 14 4 6 6 6 6 6 6 Flame retardant MCA-12 　 　 　 　 6 　 　 　 　 　 　 　 　 carbon black 0.35 0.35 0.35 0.35 0.35 0.35 0.35 0.35 0.2 0.2 0.2 0.05 0.6 Ultramarine Blue 8008 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0 0.02 0 0.02 0.02 Phthalocyanine Blue K6907 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0 0 0.04 0.04 0.04 Tensile strength (Mpa) 113 109 106 83 87 97 95 85 94 96 93 85 83 <![CDATA[Izod impact strength (KJ / m 2 )]]> 37 55 58 45 47 44 45 44 39 40 41 45 44 GWFI / 960℃ pass Fail Fail pass pass pass Fail pass pass pass pass pass pass CTI (V) 550 550 550 525 550 550 550 550 550 550 550 550 525 Heat distortion temperature HDT (℃) 210 208 205 163 168 190 191 162 191 192 190 167 163 Color difference value L1 of unmarked area 27.11 26.85 26.77 29.41 28.82 27.41 27.12 29.52 27.08 27.05 27.10 28.68 26.12 Marked area color difference value L2 70.12 70.26 70.21 60.96 65.35 68.59 68.46 58.74 68.21 68.32 68.48 70.63 61.29 Laser marking contrast ΔL 43.01 43.41 43.44 31.55 36.53 41.18 41.34 29.22 41.13 41.27 41.38 41.95 35.17 Laser marking effect good excellent excellent Dark Dark yellowish yellowish Dark Reddish yellow yellowish yellowish good Dark Injection molded product appearance Level 1 Level 4 Level 4 Level 1 Level 1 Level 2 Level 2 Level 1 Level 2 Level 2 Level 2 Level 1 Level 1

[0085] The test results in Table 1 and Table 2 show that obtaining MCA flame retardant black polyamide material with excellent comprehensive performance is related to multiple factors.

[0086] Compared with Example 3, the low-viscosity PA6 component in Example 1 is reduced, and the appearance of the injection molded product is relatively poor.

[0087] Compared with Example 4, the viscosity of the nylon resin in Comparative Examples 1 to 3 has a greater impact on the material's impact resistance, flame retardancy, and the appearance of the injection molded product, laser marking effect, and other properties.

[0088] In Comparative Example 4, the MCA flame retardant was mixed and melt-extruded together. Compared with Example 1, the background color difference value was increased, and the laser marking effect was worse.

[0089] Comparative Example 5 uses a different particle size of MCA flame retardant. Compared with Example 1, the particle size is smaller and the laser marking effect is relatively poor.

[0090] In Comparative Example 8, compared with Example 1, carbon black is extruded separately in steps, and the dispersion of carbon black in the matrix is poor, resulting in the matrix not being black enough and the laser marking being dark.

[0091] Figure 1 Example 1 for low voltage electrical appliances and 5G1U applications ( Figure 1 Right) and Comparative Example 4 ( Figure 1 The laser marking effect can be clearly seen in the product example (left).

[0092] Figure 2 For Example 1 ( Figure 1 Left) and Comparative Example 3 ( Figure 1 (Right) Optical microscope photograph of the shell surface, showing that the dispersion effect of glass fibers in Example 1 is better than that in Comparative Example 3, that is, Example 1 has a good effect of improving the appearance of floating fibers.

[0093] In an MCA flame-retardant nylon system, under the specific preparation conditions of the examples, when used in conjunction with carbon black in a ratio of (15:1) to (40:1), the black nitrogen-based flame-retardant nylon composite material exhibited a laser marking contrast ΔL exceeding 42, demonstrating excellent overall performance. In Example 5, when the MCA content was 5 phr, the GWFI / 960°C standard could not be consistently passed. However, in some applications, achieving the GWFI / 960°C standard is not necessary and can be used normally.

[0094] The present application scheme gives it good processing performance and appearance performance to a certain extent. The composite material can be used in low-voltage electrical appliances, electrical and electronic equipment, home appliances and other fields.

[0095] Experimental data shows that low-viscosity nylon resins offer excellent fluidity, reducing fiber floating in the shell during injection molding. Using MCA with a larger particle size than those typically used in flame-retardant systems facilitates dispersion within the nylon resin matrix, resulting in better flame retardancy. For the same MCA content, larger particle sizes result in smaller specific surface areas. Similarly, for the same amount of carbon black, the base color of the part appears darker.

[0096] It should be noted that in conventional polyamide MCA flame retardant systems, the MCA particle size used is below 3 microns, with a large specific surface area and low cost.

[0097] Experimental data shows that the weight ratio of MCA is 6 to 10 parts. Too little MCA results in poor flame retardancy and failure to pass the 960°C / 1.5mm GWFI standard. Excessive addition affects the blackness of the nylon matrix. The amount of carbon black added significantly affects the matrix blackness and laser marking performance. Too little carbon black fails to achieve a satisfactory blackness, while too much carbon black results in unclear laser marking. A mixture of antioxidant S 9228 and antioxidant 1098 in a mass ratio of (1:1) to (1:3) can improve the material's resistance to high-temperature yellowing during processing, helping to address yellowing issues in finished products.

Claims

1. MCA flame retardant black polyamide composite material with high-definition laser marking, characterized by: Calculated by weight, it includes the following components: 50-74 parts of nylon resin; Glass fiber 20~40 parts; MCA flame retardant 5~13 parts; Carbon black 0.1~0.5 parts; 0.2~0.6 parts of lubricant; Antioxidant 0~0.5 parts; The nylon resin is one or both of PA6 and PA66 with a relative viscosity of 2.0-2.4; the average particle size of the MCA is 6-10 μm, The preparation method of the composite material includes the following steps: A: First, melt and shear the components except MCA through a screw extruder to obtain a pre-dispersed system; B: MCA is added to the pre-dispersed system and sheared and blended by a screw extruder to obtain a well-dispersed composite melt.

2. The composite material according to claim 1, characterized in that The MCA flame retardant is 6 to 10 parts by weight.

3. The composite material according to claim 1, characterized in that The ratio of the MCA flame retardant to carbon black is (15:1) to (40:1).

4. The composite material according to claim 1, characterized in that The glass fiber is alkali-free glass fiber.

5. The composite material according to claim 1, characterized in that The carbon black is medium-high pigment carbon black.

6. The composite material according to claim 1, characterized in that The lubricant includes one or more of ethylene bisstearamide, calcium stearate, and modified ethylene bisstearamide.

7. The composite material according to claim 1, characterized in that The antioxidant includes one or more of hindered phenols and phosphites.

8. The composite material according to claim 1, characterized in that The antioxidant is a mixture of antioxidant S 9228 and antioxidant 1098 in a mass ratio of 1:1 to 1:

3.

9. The composite material according to claim 1, characterized in that Also included is 0.02-0.1 parts by weight of pigment.

10. The composite material according to claim 9, characterized in that The pigment includes one or more of ultramarine blue, cobalt blue, and phthalocyanine blue.

11. A method for preparing the composite material according to any one of claims 1 to 10, characterized in that: The blending steps include: A: First, melt and shear the components except MCA through a screw extruder to obtain a pre-dispersed system; B: MCA was added to the pre-dispersed system and sheared and blended by a screw extruder to obtain a well-dispersed composite melt.

12. The preparation method according to claim 11, characterized in that In the blending step, step A and step B are respectively operated at the main feeding port and the side feeding port on the same screw extruder.

13. The preparation method according to claim 11, characterized in that In the blending step: step A and step B are respectively operated in different screw extruders.

14. Use of the composite material according to any one of claims 1 to 10, characterized in that: It is used in the laser marking of black and white parts in the field of low-voltage electrical appliances and 5G circuit breakers.

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