800v high tracking index halogen-free flame-retardant reinforced plastic and preparation method thereof

Abstract

This invention discloses an 800V high tracking-free halogen-retardant flame-retardant reinforced plastic and its preparation method, belonging to the field of polymer materials technology. The plastic comprises a matrix resin of 30%-50%, selected from polyphenylene ether or polycarbonate, providing the material with basic mechanical properties and thermal stability; a halogen-free flame retardant of 15%-30%, composed of phosphorus-based flame retardants such as phosphate esters and phosphazene compounds, and nitrogen-based flame retardants such as melamine cyanurate, with a phosphorus-to-nitrogen weight ratio of 1.5:1 to 3:1, achieving a highly efficient halogen-free flame-retardant effect; and reinforcing fibers of 20%-40%, selected from glass fibers or carbon fibers. By adding tracking inhibitors such as nano-silica and layered silicates, this invention significantly improves the tracking index of the material under humid conditions, reaching a maximum of no less than 700V. This characteristic effectively enhances the insulation reliability of the material in complex electrical environments, reduces safety hazards caused by leakage, and is suitable for high-voltage electrical equipment fields with stringent electrical safety requirements.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, and in particular to an 800V high leakage current tracking halogen-free flame-retardant reinforced plastic and its preparation method. Background Technology

[0002] In the electrical field, especially in high-voltage electrical equipment, the tracking properties of materials are crucial. When electrical equipment is in complex environments such as dampness or pollution, conductive paths may form on the surface of the insulating material, leading to leakage. This not only causes a decline in equipment performance and a shortened lifespan, but may also cause serious safety accidents such as fires and electric shocks.

[0003] Currently, some plastic materials on the market have low tracking index under humid conditions, making it difficult to meet the insulation reliability requirements of high-voltage electrical equipment. For example, in some outdoor electrical equipment, due to long-term exposure to humid environments, the insulation performance of ordinary plastic materials will gradually deteriorate, easily causing tracking, which in turn affects the stable operation of the entire electrical system and may even endanger personnel safety.

[0004] With the rapid development of industries such as electronics, electrical appliances, and rail transportation, increasingly higher requirements are being placed on the flame-retardant properties of materials. Traditional flame-retardant plastic materials mostly employ a single flame-retardant system, such as using only phosphorus-based flame retardants. While phosphorus-based flame retardants can inhibit combustion to some extent, they also have certain limitations.

[0005] When using only phosphorus-based flame retardants, the material may produce a significant amount of smoke and toxic gases during combustion. This not only pollutes the environment but also hinders evacuation and rescue efforts in the event of a fire. Furthermore, a single phosphorus-based flame retardant often fails to achieve a high flame retardancy rating, such as UL94V-0, which is unacceptable for applications with extremely stringent safety requirements.

[0006] Furthermore, nitrogen-based flame retardants possess a unique flame-retardant mechanism, promoting char formation and reducing the generation of combustible gases during combustion. However, using nitrogen-based flame retardants alone can result in less than ideal flame-retardant effects.

[0007] Therefore, we provide an 800V high leakage tracking halogen-free flame-retardant reinforced plastic and its preparation method. Summary of the Invention

[0008] The purpose of this invention is to solve the problems in the prior art by proposing an 800V high leakage current tracking halogen-free flame retardant reinforced plastic and its preparation method.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A halogen-free flame-retardant reinforced plastic with high leakage current tracking and a weight percentage, comprising:

[0011] The matrix resin accounts for 30%-50%, and is selected from polyphenylene ether or polycarbonate, which provides the material with basic mechanical properties and thermal stability.

[0012] Halogen-free flame retardants account for 15%-30% and are composed of phosphorus-based flame retardants such as phosphate esters and phosphazene compounds and nitrogen-based flame retardants such as melamine cyanurate. The weight ratio of phosphorus-based to nitrogen-based flame retardants is 1.5:1 to 3:1 to achieve a highly efficient halogen-free flame retardant effect.

[0013] Reinforcing fibers account for 20%-40%, with glass fiber or carbon fiber selected to significantly improve the tensile strength, flexural strength and impact strength of the material;

[0014] The tracking inhibitor accounts for 1%-5%, and uses nano-silica or layered silicate with an average particle size of less than 100 nanometers, which effectively suppresses tracking phenomena under high voltage.

[0015] Antioxidants account for 0.1%-1%, and are hindered phenolic antioxidants, which prevent the material from aging during processing and use;

[0016] Lubricant accounts for 0.5%-2%, and stearate or silicone lubricants are selected to improve the processing fluidity of the material;

[0017] Other additives account for 0%-5%, such as coupling agents, which are used to enhance the interfacial bonding between the reinforcing fibers and the matrix resin.

[0018] Preferably, the phosphorus-based flame retardant is a phosphate ester or a phosphazene compound, and the nitrogen-based flame retardant is melamine cyanurate, with a weight ratio of phosphorus-based to nitrogen-based flame retardant of 1.5:1 to 3:1.

[0019] Preferably, the tracking inhibitor is nano-silica or layered silicate with an average particle size of less than 100 nanometers and is uniformly dispersed in the matrix resin.

[0020] Preferably, the antioxidant is a hindered phenolic antioxidant, and the lubricant is a stearate or silicone lubricant.

[0021] Preferably, the other additives include coupling agents to improve the interfacial bonding between the reinforcing fibers and the matrix resin.

[0022] Preferably, a method for preparing 800V high tracking halogen-free flame-retardant reinforced plastic is also provided, comprising the following steps: raw material pretreatment, drying the matrix resin and surface treating the reinforcing fibers; mixing and batching, adding the pretreated components to a high-speed mixer in proportion and mixing evenly to form a premix; melt extrusion, adding the premix to a twin-screw extruder for melt extrusion granulation; injection molding, drying the granulated material again and then using an injection molding machine to injection mold it into a product of the desired shape; and post-treatment, heat treating the molded product to eliminate internal stress.

[0023] Preferably, in the raw material pretreatment step, the drying temperature of the matrix resin is 80℃-100℃, and the drying time is 4h-6h; the surface treatment of the reinforcing fiber is carried out by impregnation with a silane coupling agent.

[0024] Preferably, in the mixing and batching step, the speed of the high-speed mixer is 500 r / min-1000 r / min, and the mixing time is 5 min-15 min; the continued mixing time after adding the reinforcing fiber is 3 min-5 min.

[0025] Preferably, the extrusion temperature of the twin-screw extruder is 260℃-320℃, and the screw speed is 200r / min to 400r / min; in the injection molding step, the barrel temperature is 280℃-340℃, and the injection pressure is 60MPa-100MPa.

[0026] Preferably, in the post-processing step, the heat treatment temperature is 120℃-160℃ and the time is 2h-4h; the obtained 800V high tracking halogen-free flame-retardant reinforced plastic has a tracking index of not less than 800 volts and a flame retardant rating of UL94V-0.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] 1. By adding tracking inhibitors such as nano-silica and layered silicates, the tracking index of the material under humid conditions is significantly improved, reaching a maximum of no less than 700V. This characteristic effectively enhances the insulation reliability of the material in complex electrical environments, reduces safety hazards caused by leakage, and is suitable for high-voltage electrical equipment fields with stringent electrical safety requirements.

[0029] 2. By using a specific ratio of phosphorus-based and nitrogen-based flame retardants, and leveraging their synergistic effect, the material achieves a UL94V-0 flame retardant rating. Compared to using phosphorus-based flame retardants alone, this compound system performs better in inhibiting combustion reactions and reducing smoke release, significantly improving the material's safety performance in fire scenarios and meeting the stringent requirements for flame-retardant materials in the electronics, electrical appliances, and rail transportation industries.

[0030] 3. By introducing reinforcing fibers such as glass fiber and carbon fiber, and optimizing the compounding ratio of polyphenylene ether and polycarbonate in the matrix resin, the tensile strength of the material is significantly enhanced, reaching up to 135 MPa. The uniform dispersion of the reinforcing fibers and the synergistic effect of the matrix resin enable the material to maintain good processing performance while possessing excellent impact resistance and structural stability, making it widely applicable in fields requiring high-strength and high-rigidity structural components. Attached Figure Description

[0031] Figure 1 This is a transmission electron microscope (TEM) image of the 800V high leakage tracking halogen-free flame-retardant reinforced plastic prepared according to Embodiment 1 of the present invention.

[0032] Figure 2 This is a transmission electron microscope (TEM) image of the halogen-free flame-retardant reinforced plastic with high leakage current tracking prepared in Comparative Example 3 of this invention.

[0033] Figure 3 This is a transmission electron microscope (TEM) image of the halogen-free flame-retardant reinforced plastic with high leakage current tracking prepared in Comparative Example 4 of this invention. Detailed Implementation

[0034] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0035] I. Testing Standards

[0036] This test was conducted in accordance with the relevant technical requirements in GB / T1040 "Determination of Tensile Properties of Plastics", GB / T2408 "Determination of Burning Properties of Plastics - Horizontal and Vertical Methods", and GB / T4207 "Determination of Comparative Tracking Index and Tracking Resistance Index of Solid Insulating Materials under Moist Conditions".

[0037] II. Raw Material Preparation

[0038] Matrix resin: polyphenylene oxide (PPO), polycarbonate (PC), commercially available products, purity ≥99%.

[0039] Halogen-free flame retardants: phosphate esters, phosphazene compounds, melamine cyanurate, commercially available products, purity ≥98%.

[0040] Reinforcing fibers: glass fiber, carbon fiber, commercially available products, length 3-6mm.

[0041] Tracking inhibitor: Nano silica, layered silicate, commercially available products, with an average particle size of less than 100nm.

[0042] Antioxidant: Hindered phenolic antioxidant, commercially available product, purity ≥99%.

[0043] Lubricants: stearates, silicone lubricants, commercially available products, purity ≥98%.

[0044] Coupling agent: Silane coupling agent, commercially available product, purity ≥98%.

[0045] III. Examples

[0046] Example 1

[0047] Raw material ratio

[0048] Matrix resin: 40% polyphenylene ether

[0049] Halogen-free flame retardant: 12% phosphate ester, 12% melamine cyanurate (the weight ratio of phosphorus-based to nitrogen-based flame retardants is 1:1, and the total proportion is expressed here).

[0050] Reinforcing fiber: 30% glass fiber

[0051] Tracking inhibitor: 3% nano-silica

[0052] Antioxidant: 0.5% hindered phenolic antioxidant

[0053] Lubricant: 1.5% stearate

[0054] Coupling agent: 1%

[0055] Preparation method

[0056] Raw material pretreatment: Dry polyphenylene ether at 90°C for 5 hours, and impregnate glass fiber with silane coupling agent for 30 minutes.

[0057] Mixing ingredients: Add the dried polyphenylene ether, phosphate ester, melamine cyanurate, nano silica, hindered phenolic antioxidant, stearate and coupling agent to a high-speed mixer and mix at 800 rpm for 10 minutes. Then add glass fiber and continue mixing for 4 minutes to form a premix.

[0058] Melt extrusion: The premixed material is added to a twin-screw extruder, the extrusion temperature is 290℃, the screw speed is 300 rpm, and melt extrusion granulation is performed.

[0059] Injection molding: The granulated material is dried at 100℃ for 3 hours, and then injection molded using an injection molding machine with a barrel temperature of 310℃ and an injection pressure of 80MPa to produce a standard sample.

[0060] Post-treatment: The molded sample was heat-treated at 140℃ for 3 hours.

[0061] Performance testing

[0062] Tensile strength: The tensile strength was tested and found to be 120 MPa.

[0063] Flame retardant rating: UL94V-0.

[0064] Tracking index: not less than 650V.

[0065] Example 2

[0066] Raw material ratio

[0067] Matrix resin: 35% polycarbonate

[0068] Halogen-free flame retardant: 10% phosphazene compounds, 15% melamine cyanurate (the weight ratio of phosphorus-based to nitrogen-based flame retardants is approximately 2:3).

[0069] Reinforcing fiber: 35% carbon fiber

[0070] Tracking inhibitor: 4% layered silicate

[0071] Antioxidant: Hindered phenolic antioxidant 0.8%

[0072] Lubricant: 1.2% silicone-based lubricant

[0073] Coupling agent: 0.8%

[0074] Preparation method

[0075] Raw material pretreatment: The polycarbonate was dried at 85°C for 6 hours, and the carbon fiber was impregnated with a silane coupling agent for 40 minutes.

[0076] Mixing ingredients: Add the dried polycarbonate, phosphazene compounds, melamine cyanurate, layered silicates, hindered phenolic antioxidants, silicone lubricants and coupling agents to a high-speed mixer and mix at 700 rpm for 12 minutes. Then add carbon fibers and continue mixing for 5 minutes to form a premix.

[0077] Melt extrusion: The premixed material is added to a twin-screw extruder, the extrusion temperature is 300℃, the screw speed is 350 rpm, and melt extrusion granulation is performed.

[0078] Injection molding: The granulated material is dried at 95°C for 4 hours, and then injection molded using an injection molding machine with a barrel temperature of 320°C and an injection pressure of 90MPa to produce a standard sample.

[0079] Post-treatment: The molded sample was heat-treated at 150°C for 2.5 hours.

[0080] Performance testing

[0081] Tensile strength: The tensile strength was tested and found to be 130 MPa.

[0082] Flame retardant rating: UL94V-0.

[0083] Tracking index: not less than 680V.

[0084] Example 3

[0085] Raw material ratio

[0086] Matrix resin: 45% polyphenylene ether

[0087] Halogen-free flame retardant: 15% phosphate ester, 10% melamine cyanurate (phosphorus-based to nitrogen-based flame retardant weight ratio is 3:2).

[0088] Reinforcing fiber: 25% glass fiber

[0089] Tracking inhibitor: 2% nano-silica

[0090] Antioxidant: 0.3% hindered phenolic antioxidants

[0091] Lubricant: 1% stearate

[0092] Coupling agent: 1.2%

[0093] Preparation method

[0094] Raw material pretreatment: Dry polyphenylene ether at 95°C for 4 hours, and impregnate glass fiber with silane coupling agent for 25 minutes.

[0095] Mixing ingredients: Add the dried polyphenylene ether, phosphate ester, melamine cyanurate, nano silica, hindered phenolic antioxidant, stearate and coupling agent to a high-speed mixer and mix at 900 rpm for 8 minutes. Then add glass fiber and continue mixing for 3 minutes to form a premix.

[0096] Melt extrusion: The premixed material is added to a twin-screw extruder, the extrusion temperature is 280℃, the screw speed is 250 rpm, and melt extrusion granulation is performed.

[0097] Injection molding: The granulated material is dried at 105℃ for 2.5 hours, and then injection molded into a standard sample using an injection molding machine with a barrel temperature of 300℃ and an injection pressure of 70MPa.

[0098] Post-treatment: The molded sample was heat-treated at 130℃ for 3.5 hours.

[0099] Performance testing

[0100] Tensile strength: The tensile strength was tested and found to be 115 MPa.

[0101] Flame retardant rating: UL94V-0.

[0102] Tracking index: not less than 630V.

[0103] Example 4

[0104] Raw material ratio

[0105] Matrix resin: 30% polycarbonate

[0106] Halogen-free flame retardant: 12% phosphazene compounds, 13% melamine cyanurate (the weight ratio of phosphorus-based to nitrogen-based flame retardants is approximately 12:13).

[0107] Reinforcing fiber: 40% carbon fiber

[0108] Tracking inhibitor: 3.5% layered silicate

[0109] Antioxidant: Hindered phenolic antioxidant 0.6%

[0110] Lubricant: 1.5% silicone-based lubricant

[0111] Coupling agent: 0.9%

[0112] Preparation method

[0113] Raw material pretreatment: The polycarbonate was dried at 80°C for 6.5 hours, and the carbon fiber was impregnated with a silane coupling agent for 35 minutes.

[0114] Mixing ingredients: Add the dried polycarbonate, phosphazene compounds, melamine cyanurate, layered silicates, hindered phenolic antioxidants, silicone lubricants and coupling agents to a high-speed mixer and mix at 800 rpm for 15 minutes. Then add carbon fibers and continue mixing for 4.5 minutes to form a premix.

[0115] Melt extrusion: The premixed material is added to a twin-screw extruder, the extrusion temperature is 310℃, the screw speed is 400 rpm, and melt extrusion granulation is performed.

[0116] Injection molding: The granulated material is dried at 90°C for 4.5 hours, and then injection molded into a standard sample using an injection molding machine with a barrel temperature of 330°C and an injection pressure of 95MPa.

[0117] Post-treatment: The molded sample was heat-treated at 160℃ for 2 hours.

[0118] Performance testing

[0119] Tensile strength: The tensile strength was tested and found to be 135 MPa.

[0120] Flame retardant rating: UL94V-0.

[0121] Tracking index: not less than 700V.

[0122] IV. Comparative Example

[0123] Comparative Example 1

[0124] Raw material ratio

[0125] Matrix resin: 40% polyphenylene ether

[0126] Halogen-free flame retardant: 12% phosphate ester, 12% melamine cyanurate (the weight ratio of phosphorus-based to nitrogen-based flame retardants is 1:1, and the total proportion is expressed here).

[0127] Reinforcing fiber: 30% glass fiber

[0128] Antioxidant: 0.5% hindered phenolic antioxidant

[0129] Lubricant: 1.5% stearate

[0130] Coupling agent: 1%

[0131] Preparation method

[0132] Raw material pretreatment: Dry polyphenylene ether at 90°C for 5 hours, and impregnate glass fiber with silane coupling agent for 30 minutes.

[0133] Mixing ingredients: Add the dried polyphenylene ether, phosphate ester, melamine cyanurate, nano silica, hindered phenolic antioxidant, stearate and coupling agent to a high-speed mixer and mix at 800 rpm for 10 minutes. Then add glass fiber and continue mixing for 4 minutes to form a premix.

[0134] Melt extrusion: The premixed material is added to a twin-screw extruder, the extrusion temperature is 290℃, the screw speed is 300 rpm, and melt extrusion granulation is performed.

[0135] Injection molding: The granulated material is dried at 100℃ for 3 hours, and then injection molded using an injection molding machine with a barrel temperature of 310℃ and an injection pressure of 80MPa to produce a standard sample.

[0136] Post-treatment: The molded sample was heat-treated at 140℃ for 3 hours.

[0137] Performance testing

[0138] Tensile strength: The tensile strength was tested and found to be 118 MPa.

[0139] Flame retardant rating: UL94V-0.

[0140] Tracking index: only 450V, far lower than that of Example 1, indicating that tracking inhibitors play an important role in improving the tracking performance of materials.

[0141] Comparative Example 2

[0142] Raw material ratio

[0143] Matrix resin: 35% polycarbonate

[0144] Phosphate esters: 10% phosphazene compounds, 15% melamine cyanurate (the weight ratio of phosphorus-based to nitrogen-based flame retardants is approximately 2:3).

[0145] Reinforcing fiber: 35% carbon fiber

[0146] Tracking inhibitor: 4% layered silicate

[0147] Antioxidant: Hindered phenolic antioxidant 0.8%

[0148] Lubricant: 1.2% silicone-based lubricant

[0149] Coupling agent: 0.8%

[0150] Preparation method

[0151] Raw material pretreatment: The polycarbonate was dried at 85°C for 6 hours, and the carbon fiber was impregnated with a silane coupling agent for 40 minutes.

[0152] Mixing ingredients: Add the dried polycarbonate, phosphazene compounds, melamine cyanurate, layered silicates, hindered phenolic antioxidants, silicone lubricants and coupling agents to a high-speed mixer and mix at 700 rpm for 12 minutes. Then add carbon fibers and continue mixing for 5 minutes to form a premix.

[0153] Melt extrusion: The premixed material is added to a twin-screw extruder, the extrusion temperature is 300℃, the screw speed is 350 rpm, and melt extrusion granulation is performed.

[0154] Injection molding: The granulated material is dried at 95°C for 4 hours, and then injection molded using an injection molding machine with a barrel temperature of 320°C and an injection pressure of 90MPa to produce a standard sample.

[0155] Post-treatment: The molded sample was heat-treated at 150°C for 2.5 hours.

[0156] Performance testing

[0157] Tensile strength: The tensile strength was tested and found to be 125 MPa.

[0158] Flame retardant rating: It can only reach UL94V-1 level, which means that using phosphorus-based flame retardants alone cannot achieve a good flame retardant effect. Only the synergistic effect of nitrogen-based flame retardants and phosphorus-based flame retardants can achieve high-efficiency flame retardancy.

[0159] Tracking index: not less than 660V.

[0160] Comparative Example 3

[0161] Raw material ratio

[0162] Matrix resin: 45% polyphenylene ether

[0163] Halogen-free flame retardant: 15% phosphate ester, 10% melamine cyanurate (phosphorus-based to nitrogen-based flame retardant weight ratio is 3:2).

[0164] Tracking inhibitor: 2% nano-silica

[0165] Antioxidant: 0.3% hindered phenolic antioxidants

[0166] Lubricant: 1% stearate

[0167] Coupling agent: 1.2%

[0168] Preparation method

[0169] Raw material pretreatment: Dry polyphenylene ether at 95°C for 4 hours.

[0170] Mixing ingredients: Add the dried polyphenylene ether, phosphate ester, melamine cyanurate, nano silica, hindered phenolic antioxidant, stearate and coupling agent to a high-speed mixer and mix at 900 rpm for 8 minutes, then continue mixing for 3 minutes to form a premix.

[0171] Melt extrusion: The premixed material is added to a twin-screw extruder, the extrusion temperature is 280℃, the screw speed is 250 rpm, and melt extrusion granulation is performed.

[0172] Injection molding: The granulated material is dried at 105℃ for 2.5 hours, and then injection molded into a standard sample using an injection molding machine with a barrel temperature of 300℃ and an injection pressure of 70MPa.

[0173] Post-treatment: The molded sample was heat-treated at 130℃ for 3.5 hours.

[0174] Performance testing

[0175] Tensile strength: The tensile strength was tested to be only 60 MPa, which is much lower than that of Example 3, indicating that the reinforcing fiber has a significant effect on improving the mechanical properties of the material.

[0176] Flame retardant rating: UL94V-0.

[0177] Tracking index: not less than 620V.

[0178] Comparative Example 4

[0179] Raw material ratio

[0180] Polyphenylene oxide: 30% polycarbonate

[0181] Halogen-free flame retardant: 12% phosphazene compounds, 13% melamine cyanurate (the weight ratio of phosphorus-based to nitrogen-based flame retardants is approximately 12:13).

[0182] Reinforcing fiber: 40% carbon fiber

[0183] Tracking inhibitor: 3.5% layered silicate

[0184] Antioxidant: Hindered phenolic antioxidant 0.6%

[0185] Lubricant: 1.5% silicone-based lubricant

[0186] Coupling agent: 0.9%.

[0187] Preparation method

[0188] Raw material pretreatment: The polycarbonate was dried at 80°C for 6.5 hours, and the carbon fiber was impregnated with a silane coupling agent for 35 minutes.

[0189] Mixing ingredients: Add the dried polycarbonate, phosphazene compounds, melamine cyanurate, layered silicates, hindered phenolic antioxidants, silicone lubricants and coupling agents to a high-speed mixer and mix at 800 rpm for 15 minutes. Then add carbon fibers and continue mixing for 4.5 minutes to form a premix.

[0190] Melt extrusion: The premixed material is added to a twin-screw extruder, the extrusion temperature is 310℃, the screw speed is 400 rpm, and melt extrusion granulation is performed.

[0191] Injection molding: The granulated material is dried at 90°C for 4.5 hours, and then injection molded into a standard sample using an injection molding machine with a barrel temperature of 330°C and an injection pressure of 95MPa.

[0192] Post-treatment: The molded sample was heat-treated at 160℃ for 2 hours.

[0193] Performance testing

[0194] Tensile strength: The tensile strength reached 105 MPa, indicating that the combination of polycarbonate and polyphenylene ether in a certain proportion as the matrix resin can better exert the mechanical properties of the material.

[0195] Flame retardant rating: UL94V-0.

[0196] Tracking index: not less than 680V.

[0197] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An 800V high tracking index halogen-free flame-retardant reinforced plastic, characterized in that, Its components, by weight percentage, include: The matrix resin accounts for 30%-50%, and is selected from polyphenylene ether or polycarbonate, which provides the material with basic mechanical properties and thermal stability. Halogen-free flame retardants account for 15%-30% and are composed of phosphorus-based flame retardants such as phosphate esters and phosphazene compounds and nitrogen-based flame retardants such as melamine cyanurate. The weight ratio of phosphorus-based to nitrogen-based flame retardants is 1.5:1 to 3:1 to achieve a highly efficient halogen-free flame retardant effect. Reinforcing fibers account for 20%-40%, with glass fiber or carbon fiber selected to significantly improve the tensile strength, flexural strength and impact strength of the material; The tracking inhibitor accounts for 1%-5%, and uses nano-silica or layered silicate with an average particle size of less than 100 nanometers, which effectively suppresses tracking phenomena under high voltage. Antioxidants account for 0.1%-1%, and are hindered phenolic antioxidants, which prevent the material from aging during processing and use; Lubricant accounts for 0.5%-2%, and stearate or silicone lubricants are selected to improve the processing fluidity of the material; Other additives account for 0%-5%, such as coupling agents, which are used to enhance the interfacial bonding between the reinforcing fibers and the matrix resin.

2. The 800 V high tracking index halogen-free flame-retardant reinforced plastic according to claim 1, characterized in that The phosphorus-based flame retardant is a phosphate ester or phosphazene compound, and the nitrogen-based flame retardant is melamine cyanurate. The weight ratio of phosphorus-based to nitrogen-based flame retardants is 1.5:1-3:

1.

3. The 800 V high tracking index halogen-free flame-retardant reinforced plastic according to claim 1, characterized in that, The tracking inhibitor is made of nano-silica or layered silicate with an average particle size of less than 100 nanometers and is uniformly dispersed in the matrix resin.

4. The 800 V high tracking index halogen-free flame-retardant reinforced plastic according to claim 1, characterized in that, The antioxidant is a hindered phenolic antioxidant, and the lubricant is a stearate or silicone lubricant.

5. The 800 V high tracking index halogen-free flame-retardant reinforced plastic according to claim 1, characterized in that, Other additives include coupling agents, which are used to improve the interfacial bonding between the reinforcing fibers and the matrix resin.

6. A method for preparing an 800V high tracking-free halogen-retardant reinforced plastic as described in any one of claims 1-5, characterized in that, Includes the following steps: Raw material pretreatment involves drying the matrix resin and surface treatment of the reinforcing fibers. Mixing and compounding: The pre-treated components are added to a high-speed mixer in proportion and mixed evenly to form a premix; melt extrusion: The premix is ​​added to a twin-screw extruder for melt extrusion granulation; injection molding: The granulated material is dried again and then injection molded into the desired shape using an injection molding machine; post-treatment: The molded product is heat-treated to eliminate internal stress.

7. The preparation method according to claim 6, characterized in that, In the raw material pretreatment step, the drying temperature of the matrix resin is 80℃-100℃ and the drying time is 4h-6h; the surface treatment of the reinforcing fiber is carried out by impregnation with silane coupling agent.

8. The preparation method according to claim 6, characterized in that, In the mixing and batching step, the speed of the high-speed mixer is 500r / min-1000r / min, and the mixing time is 5min-15min; the continued mixing time after adding the reinforcing fiber is 3min-5min.

9. The preparation method according to claim 6, characterized in that, In the melt extrusion step, the extrusion temperature of the twin-screw extruder is 260℃-320℃, and the screw speed is 200r / min to 400r / min; in the injection molding step, the barrel temperature is 280℃-340℃, and the injection pressure is 60MPa-100MPa.

10. The preparation method according to claim 6, characterized in that, In the post-processing steps, the heat treatment temperature is 120℃-160℃ and the time is 2h-4h; the obtained 800V high tracking halogen-free flame-retardant reinforced plastic has a tracking index of not less than 800 volts and a flame retardant rating of UL94V-0.

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