Flame-retardant lightweight elastomer material and preparation method thereof

Abstract

The invention relates to a flame-retardant lightweight elastomer material and a preparation method thereof, and belongs to the technical field of high polymer materials. The elastomer material is prepared from the following components in percentage by weight: 3.5 to 5.2 percent of modified flame retardant, 2.5 to 3.5 percent of polyalkenyl cross-linking agent, 0.1 to 0.13 percent of accelerant, 1.4 to 1.8 percent of lubricant, 0.15 to 0.2 percent of antioxidant and the balance of POE (Polyolefin Elastomer) resin, the modified flame retardant is prepared by the following steps: reacting o-aminobenzyl alcohol with formaldehyde to form a hydroxyl-containing triazine compound, namely an intermediate 1, carrying out click addition reaction on mercaptoacetic acid and methylallyl trisulfide to form a carboxyl-terminated intermediate 2, and finally esterifying the intermediate 2 and the intermediate 1. According to the modified flame retardant, through molecular design, in the high-temperature ignition process, high-efficiency flame suppression and low smoke and low loss are achieved through molecular-level staged flame retardance.

Description

Technical Field

[0001] The present invention belongs to the technical field of polymer materials, and in particular relates to a flame retardant lightweight elastomer material and a preparation method thereof. Background Art

[0002] Polyolefin elastomer (POE) is a thermoplastic elastomer achieved through in-situ polymerization of ethylene and α-olefins using a metallocene catalyst. The crystalline regions of the polyethylene chains act as physical crosslinks, exhibiting typical plastic properties. The addition of a certain amount of α-olefin weakens the crystalline regions of the polyethylene chains, forming amorphous regions exhibiting rubber elasticity. POE combines the properties of both plastic and rubber, offering excellent elasticity, impact and corrosion resistance, and high tensile strength. It also exhibits exceptional low-temperature toughness and lightweight properties, making it widely used in new energy cables, building seals, and other fields. However, POE material has extremely poor flame retardancy, severely limiting its application in safety-sensitive applications.

[0003] In order to expand the application of POE materials in flame-retardant products, the existing technical means mainly introduce a certain amount of flame retardants into POE materials to give them flame-retardant properties. However, there are the following technical defects: inorganic flame retardants, such as magnesium hydroxide, aluminum hydroxide, ceramic materials, etc., are generally added in high amounts, which seriously deteriorates the strength and toughness of the POE matrix, and at the same time increases the density of the material, limiting its application in lightweight products; organic flame retardants, such as phosphorus-nitrogen flame retardants, achieve high-efficiency flame retardancy by decomposing to produce carbonization-promoting substances and flame-retardant gases, which significantly improve the flame retardancy of POE to a certain extent. However, the gas source generated by the rapid decomposition of such flame retardants carries phosphides, forming a large-pore, fluffy carbon layer on the surface of the material, forming a smoke release channel, resulting in a high smoke density. At the same time, these fluffy carbon layers cause the mechanical strength of the material to deteriorate significantly. Summary of the Invention

[0004] In order to solve the technical problems mentioned in the background technology, the purpose of the present invention is to provide a flame retardant lightweight elastomer material and a preparation method thereof.

[0005] The purpose of the present invention can be achieved through the following technical solutions: A flame-retardant lightweight elastomer material, specifically comprising: 3.5-5.2wt% of a modified flame retardant, 2.5-3.5wt% of a polyolefin crosslinking agent, 0.1-0.13wt% of an accelerator, 1.4-1.8wt% of a lubricant, 0.15-0.2wt% of an antioxidant, and the balance being POE resin.

[0006] The modified flame retardant is prepared by the following method: Step A1: o-Aminobenzyl alcohol and acetone are mixed under nitrogen protection, the temperature of the water bath is controlled at 15-30°C, formaldehyde solution is added, and the reaction is stirred for 6-9 hours. Then, sodium bicarbonate solution is added and the temperature is raised to 45-55°C and the reaction is continued for 1.6-2.2 hours. After the reaction is completed, the acetone is removed by rotary evaporation, and deionized water is added to the substrate for washing. The aqueous phase is separated and dried to obtain intermediate 1; Furthermore, the dosage ratio of o-aminobenzyl alcohol, formaldehyde, sodium bicarbonate and acetone is 0.1 mol: 0.16-0.18 mol: 0.2-0.3 g: 130-170 mL, and o-aminobenzyl alcohol and formaldehyde react to form a triazine compound. The specific reaction route is as follows:

[0007] Step A2: Premix benzoin dimethyl ether and tetrahydrofuran, then add methyl allyl trisulfide and thioglycolic acid, and apply UVA light at 35-50 mW / cm 2 The reaction was stirred under irradiation for 1.5-2.2 h. After the reaction was completed, tetrahydrofuran was removed by rotary evaporation to obtain intermediate 2; Furthermore, the amount ratio of methyl allyl trisulfide, thioglycolic acid, benzoin dimethyl ether and tetrahydrofuran is 0.1 mol: 0.1 mol: 25-35 mg: 80-100 mL, and methyl allyl trisulfide and thioglycolic acid react to form a terminal carboxyl modification. The specific reaction route is as follows:

[0008] Step A3: Intermediate 1, intermediate 2, p-toluenesulfonic acid, and anhydrous toluene are mixed, and dry nitrogen is introduced. The temperature is raised to 90-100°C and stirred for reaction for 4-5 hours. Dicyclohexylcarbodiimide is then added and the temperature is continued to be raised to 110°C for reaction for 1-1.2 hours. After the reaction is completed, the toluene is removed by rotary evaporation. The substrate is washed with ethanol solution and dried to obtain a modified flame retardant. Furthermore, the usage ratio of intermediate 1, intermediate 2, p-toluenesulfonic acid, dicyclohexylcarbodiimide and anhydrous toluene is 0.1 mol: 0.3 mol: 3.5-4.5 g: 1.8-2.3 g: 350-420 mL, and intermediate 1 and intermediate 2 are subjected to esterification reaction. The specific reaction route is as follows:

[0009] Preferably, the polyene crosslinking agent is triallyl isocyanurate, which has good reactivity and can crosslink with the modified flame retardant and POE thermal degradation products under high temperature of fire to form a dense carbonized layer, thereby improving the flame retardant effect.

[0010] Preferably, the accelerator is triphenylphosphine, which has a high-temperature catalytic effect and promotes the decomposition and re-crosslinking of polysulfide in the modified flame retardant molecules.

[0011] Preferably, the lubricant is ethylene bisstearamide, which has a stable lubricating effect in the POE system and is beneficial to the molding of the elastic material.

[0012] A method for preparing a flame-retardant lightweight elastomer material comprises the following steps: uniformly mixing raw materials of various components, melting and mixing the materials in a twin-screw extruder, and extruding and pelletizing the materials to obtain the flame-retardant lightweight elastomer material.

[0013] Beneficial effects of the present invention: The present invention uses POE as a matrix and introduces a modified flame retardant to enhance the flame retardancy of the matrix while maintaining the stability of the matrix under ignition. The modified flame retardant is formed by the reaction of o-aminobenzyl alcohol and formaldehyde to form a hydroxyl-containing triazine compound, namely intermediate 1, which is then subjected to a click addition reaction between thioglycolic acid and methyl allyl trisulfide to form a carboxyl-terminated intermediate 2. Finally, intermediate 2 is esterified with intermediate 1 to prepare the modified flame retardant. During the fire ignition process, molecular-level staged flame retardancy is used to achieve efficient flame suppression, low smoke and low loss, specifically: In the first stage, polysulfide side chains decompose at high temperature to produce sulfur free radicals, which accurately capture the POE thermal decomposition olefin chains and form a dense cross-linked network in the near layer of the modified flame retardant molecules; in the second stage, the triazine structure in the middle of the modified flame retardant molecules thermally decomposes to release flame-inhibiting gas. The gas is sealed by the highly cross-linked network in the outer layer and is not easy to precipitate, forming honeycomb microcavities inside the matrix, blocking the heat conduction path and reducing the internal temperature rise rate; in the third stage, under continuous ignition and temperature increase, the highly cross-linked layer containing benzene rings carbonizes to form a stable carbon layer, which inhibits the deepening of combustion, and the dense carbon layer slows down the escape rate of the flame-inhibiting gas, achieving continuous concentration maintenance of the gas at the combustion front, avoiding the fluffy and cracking of the carbon layer caused by concentrated gas release in the traditional expansion system, and maintaining the stability of the mechanical properties of the material under fire. DETAILED DESCRIPTION

[0014] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0015] Example 1, preparation of flame retardant lightweight elastomer material, the specific implementation process is as follows: (1) Synthesis of modified flame retardants Step A1: o-Aminobenzyl alcohol and acetone were mixed under nitrogen protection, the temperature of the water bath was controlled at 15°C, formaldehyde solution was added, and the reaction was stirred for 9 hours. Then, sodium bicarbonate solution was added and the temperature was raised to 45°C and the reaction was continued for 2.2 hours. The amount ratio of o-Aminobenzyl alcohol, formaldehyde, sodium bicarbonate and acetone was 0.1 mol:0.16 mol:0.2 g:130 mL, the formaldehyde solution was an industrial raw material with a mass fraction of 44%, and the sodium bicarbonate solution was a saturated aqueous solution at room temperature. After the reaction, the acetone was removed by rotary evaporation, and deionized water was added to the substrate for washing. The aqueous phase was separated and dried to obtain intermediate 1.

[0016] Step A2: Premix benzoin dimethyl ether and tetrahydrofuran, then add methyl allyl trisulfide and thioglycolic acid, and apply UVA light at 35 mW / cm 2 The reaction was stirred and irradiated for 2.2 h, wherein the amount ratio of methyl allyl trisulfide, thioglycolic acid, benzoin dimethyl ether and tetrahydrofuran was 0.1 mol: 0.1 mol: 25 mg: 80 mL. After the reaction was completed, tetrahydrofuran was removed by rotary evaporation to obtain intermediate 2.

[0017] Step A3: Take intermediate 1, intermediate 2, p-toluenesulfonic acid and anhydrous toluene, mix them, introduce dry nitrogen protection, heat to 90°C, stir and react for 5 hours, then add dicyclohexylcarbodiimide and continue to heat to 110°C to react for 1.2 hours, wherein the amount ratio of intermediate 1, intermediate 2, p-toluenesulfonic acid, dicyclohexylcarbodiimide and anhydrous toluene is 0.1 mol: 0.3 mol: 3.5 g: 1.8 g: 350 mL. After the reaction is completed, the toluene is removed by rotary evaporation, and the substrate is washed with ethanol solution and dried to obtain a modified flame retardant.

[0018] (2) Preparation of elastomer materials The components are taken in percentage by weight: 3.5wt% modified flame retardant, which is self-made in this embodiment; 2.5wt% polyolefin crosslinker, which is industrial-grade triallyl isocyanurate raw material; 0.1wt% accelerator, which is industrial-grade triphenylphosphine raw material; 1.8wt% lubricant, which is industrial-grade ethylene bisstearamide raw material; 0.15wt% antioxidant, which is a composite of antioxidant 1076 and antioxidant 168 in a weight ratio of 2:1; the remainder is POE resin, which is 6502 type POE resin raw material.

[0019] The raw materials of each component were added to a high-speed mixer and mixed at 1200 rpm for 5 minutes. The mixture was added to a twin-screw extruder, and the barrel temperature was controlled to be set to: 150°C in zone 1, 160°C in zone 2, 170°C in zone 3, 180°C in zone 4, 180°C in zone 5, and 175°C in zone 6. The mixture was melt-mixed, extruded and pelletized to obtain a flame-retardant lightweight elastomer material.

[0020] Example 2, preparation of flame retardant lightweight elastomer material, the specific implementation process is as follows: (1) Synthesis of modified flame retardants Step A1: o-Aminobenzyl alcohol and acetone were mixed under nitrogen protection, the temperature of the water bath was controlled at 30°C, formaldehyde solution was added, and the reaction was stirred for 6 hours. Then, sodium bicarbonate solution was added and the temperature was raised to 55°C and the reaction was continued for 1.6 hours. The amount ratio of o-Aminobenzyl alcohol, formaldehyde, sodium bicarbonate and acetone was 0.1 mol: 0.18 mol: 0.3 g: 170 mL, the formaldehyde solution was an industrial raw material with a mass fraction of 44%, and the sodium bicarbonate solution was a saturated aqueous solution at room temperature. After the reaction, the acetone was removed by rotary evaporation, and deionized water was added to the substrate for washing. The aqueous phase was separated and dried to obtain intermediate 1.

[0021] Step A2: Premix benzoin dimethyl ether and tetrahydrofuran, then add methyl allyl trisulfide and thioglycolic acid, and apply UVA light at 50 mW / cm 2 The reaction was stirred under irradiation for 1.5 h, wherein the amount ratio of methyl allyl trisulfide, thioglycolic acid, benzoin dimethyl ether and tetrahydrofuran was 0.1 mol: 0.1 mol: 35 mg: 100 mL. After the reaction was completed, tetrahydrofuran was removed by rotary evaporation to obtain intermediate 2.

[0022] Step A3: Take intermediate 1, intermediate 2, p-toluenesulfonic acid and anhydrous toluene, mix them, introduce dry nitrogen protection, heat to 100°C and stir to react for 4 hours, then add dicyclohexylcarbodiimide and continue to heat to 110°C to react for 1 hour, wherein the amount ratio of intermediate 1, intermediate 2, p-toluenesulfonic acid, dicyclohexylcarbodiimide and anhydrous toluene is 0.1 mol: 0.3 mol: 4.5 g: 2.3 g: 420 mL. After the reaction is completed, the toluene is removed by rotary evaporation, and the substrate is washed with ethanol solution and dried to obtain a modified flame retardant.

[0023] (2) Preparation of elastomer materials The components are taken in percentage by weight: 5.2 wt % of modified flame retardant, which is self-made in this embodiment; 3.5 wt % of polyolefin crosslinker, which is industrial-grade triallyl isocyanurate raw material; 0.13 wt % of accelerator, which is industrial-grade triphenylphosphine raw material; 1.4 wt % of lubricant, which is industrial-grade ethylene bisstearamide raw material; 0.2 wt % of antioxidant, which is antioxidant 1076 and antioxidant 168 used in combination at a weight ratio of 2:1; the remainder is POE resin, which is 6502 type POE resin raw material.

[0024] The raw materials of each component were added to a high-speed mixer and mixed at 1200 rpm for 5 minutes. The mixture was added to a twin-screw extruder, and the barrel temperature was controlled to be set to: 150°C in zone 1, 160°C in zone 2, 170°C in zone 3, 180°C in zone 4, 185°C in zone 5, and 180°C in zone 6. The mixture was melt-mixed, extruded and pelletized to obtain a flame-retardant lightweight elastomer material.

[0025] Example 3, preparation of flame retardant lightweight elastomer material, the specific implementation process is as follows: (1) Synthesis of modified flame retardants Step A1: o-Aminobenzyl alcohol and acetone were mixed under nitrogen protection, the temperature of the water bath was controlled at 20°C, formaldehyde solution was added, and the reaction was stirred for 8 hours. Then, sodium bicarbonate solution was added and the temperature was raised to 50°C and the reaction was continued for 2 hours. The amount ratio of o-Aminobenzyl alcohol, formaldehyde, sodium bicarbonate and acetone was 0.1 mol: 0.17 mol: 0.25 g: 160 mL, the formaldehyde solution was an industrial raw material with a mass fraction of 44%, and the sodium bicarbonate solution was a saturated aqueous solution at room temperature. After the reaction, the acetone was removed by rotary evaporation, and deionized water was added to the substrate for washing. The aqueous phase was separated and dried to obtain intermediate 1.

[0026] Step A2: Premix benzoin dimethyl ether and tetrahydrofuran, then add methyl allyl trisulfide and thioglycolic acid, and apply UVA light at 45 mW / cm 2 The reaction was stirred and irradiated for 1.7 h, wherein the amount ratio of methyl allyl trisulfide, thioglycolic acid, benzoin dimethyl ether and tetrahydrofuran was 0.1 mol: 0.1 mol: 30 mg: 90 mL. After the reaction was completed, tetrahydrofuran was removed by rotary evaporation to obtain intermediate 2.

[0027] Step A3: Take intermediate 1, intermediate 2, p-toluenesulfonic acid and anhydrous toluene, mix them, introduce dry nitrogen protection, heat to 90°C, stir and react for 4.5 hours, then add dicyclohexylcarbodiimide and continue to heat to 110°C to react for 1.2 hours, wherein the amount ratio of intermediate 1, intermediate 2, p-toluenesulfonic acid, dicyclohexylcarbodiimide and anhydrous toluene is 0.1 mol: 0.3 mol: 4 g: 2 g: 380 mL. After the reaction is completed, the toluene is removed by rotary evaporation, and the substrate is washed with ethanol solution and dried to obtain a modified flame retardant.

[0028] (2) Preparation of elastomer materials The components are taken in percentage by weight: 4.8wt% of modified flame retardant, which is self-made in this embodiment; 3.1wt% of polyene crosslinking agent, which is industrial-grade triallyl isocyanurate raw material; 0.12wt% of accelerator, which is industrial-grade triphenylphosphine raw material; 1.7wt% of lubricant, which is industrial agent ethylene bisstearamide raw material; 0.18wt% of antioxidant, which is antioxidant 1076 and antioxidant 168 used in a weight ratio of 2:1; the balance is POE resin, which is 6502 type POE resin raw material.

[0029] The raw materials of each component were added to a high-speed mixer and mixed at 1200 rpm for 5 minutes. The mixture was added to a twin-screw extruder, and the barrel temperature was controlled to be set to: 150°C in zone 1, 160°C in zone 2, 170°C in zone 3, 180°C in zone 4, 180°C in zone 5, and 175°C in zone 6. The mixture was melt-mixed, extruded and pelletized to obtain a flame-retardant lightweight elastomer material.

[0030] Example 4, preparing a flame retardant lightweight elastomer material, the specific implementation process is as follows: (1) Synthesis of modified flame retardants Step A1: o-Aminobenzyl alcohol and acetone were mixed under nitrogen protection, the temperature of the water bath was controlled at 25°C, formaldehyde solution was added, and the reaction was stirred for 7.5 hours. Then, sodium bicarbonate solution was added and the temperature was raised to 50°C and the reaction was continued for 1.8 hours. The amount ratio of o-Aminobenzyl alcohol, formaldehyde, sodium bicarbonate and acetone was 0.1 mol:0.18 mol:0.3 g:150 mL, the formaldehyde solution was an industrial raw material with a mass fraction of 44%, and the sodium bicarbonate solution was a saturated aqueous solution at room temperature. After the reaction, the acetone was removed by rotary evaporation, and deionized water was added to the substrate for washing. The aqueous phase was separated and dried to obtain intermediate 1.

[0031] Step A2: Premix benzoin dimethyl ether and tetrahydrofuran, then add methyl allyl trisulfide and thioglycolic acid, and apply UVA light at 40 mW / cm 2 The reaction was stirred and irradiated for 1.8 h, wherein the amount ratio of methyl allyl trisulfide, thioglycolic acid, benzoin dimethyl ether and tetrahydrofuran was 0.1 mol: 0.1 mol: 30 mg: 90 mL. After the reaction was completed, tetrahydrofuran was removed by rotary evaporation to obtain intermediate 2.

[0032] Step A3: Take intermediate 1, intermediate 2, p-toluenesulfonic acid and anhydrous toluene, mix them, introduce dry nitrogen protection, heat to 100°C and stir to react for 4.5 hours, then add dicyclohexylcarbodiimide and continue to heat to 110°C to react for 1 hour, wherein the amount ratio of intermediate 1, intermediate 2, p-toluenesulfonic acid, dicyclohexylcarbodiimide and anhydrous toluene is 0.1 mol: 0.3 mol: 4.2 g: 1.8 g: 400 mL. After the reaction is completed, the toluene is removed by rotary evaporation, and the substrate is washed with ethanol solution and dried to obtain a modified flame retardant.

[0033] (2) Preparation of elastomer materials The components are taken in percentage by weight: 4.5wt% modified flame retardant, which is self-made in this embodiment; 2.7wt% polyolefin crosslinker, which is industrial-grade triallyl isocyanurate raw material; 0.11wt% accelerator, which is industrial-grade triphenylphosphine raw material; 1.45wt% lubricant, which is industrial-grade ethylene bisstearamide raw material; 0.16wt% antioxidant, which is antioxidant 1076 and antioxidant 168 used in a weight ratio of 2:1; the remainder is POE resin, which is 6502 type POE resin raw material.

[0034] The raw materials of each component were added to a high-speed mixer and mixed at 1200 rpm for 5 minutes. The mixture was added to a twin-screw extruder, and the barrel temperature was controlled to be set to: 150°C in zone 1, 160°C in zone 2, 170°C in zone 3, 185°C in zone 4, 180°C in zone 5, and 180°C in zone 6. The mixture was melt-mixed, extruded, and pelletized to obtain a flame-retardant lightweight elastomer material.

[0035] In a comparative example, referring to the implementation process of Example 4, the modified flame retardant was replaced with 3 wt % melamine cyanurate salt and 1.5 wt % flame retardant FR-235, and the rest of the implementation process was exactly the same.

[0036] Samples were taken from the elastomer material prepared above and hot pressed at 165°C and 10 MPa to form sheet specimens with a thickness of 3.2 mm. Flame retardancy testing was performed according to the UL94 standard; limiting oxygen index testing was performed according to ASTM D2863-23; and smoke density testing was performed according to ASTM E662-2017. The specimens were ignited continuously and reciprocally for 300 seconds using an alcohol burner at a moving rate of 2 cm / s. The ignition test specimens were cut and the thickness of the ablation layer was measured using a three-dimensional coordinate measuring machine. The change rate of the tensile strength of the specimens before and after ignition was tested according to ASTM D412-16. The specific test data are shown in Table 1:

[0037] It can be seen from the test data in Table 1 that the samples made of the above elastomers all have good flame retardancy and meet the flame retardancy requirements of general products. Among them, the elastomers of the embodiments have extremely low smoke density during ignition, the char layer after ignition treatment is thinner, the surface quality is better, and the mechanical strength decreases less after ignition, which is conducive to maintaining the stability of the material.

[0038] Throughout the specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0039] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in similar ways. As long as they do not deviate from the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. A flame retardant lightweight elastomer material, characterized in that: The specific components are: modified flame retardant 3.5-5.2wt%, polyolefin crosslinking agent 2.5-3.5wt%, accelerator 0.1-0.13wt%, lubricant 1.4-1.8wt% and antioxidant 0.15-0.2wt%, and the balance is POE resin; The modified flame retardant is prepared by the following method: Step A1: o-Aminobenzyl alcohol and acetone were mixed under nitrogen protection, the temperature of the water bath was controlled at 15-30°C, formaldehyde solution was added, and the mixture was stirred for 6-9 hours. Then, sodium bicarbonate solution was added and the temperature was raised to 45-55°C and the reaction was continued for 1.6-2.2 hours to prepare intermediate 1; Step A2: Premix benzoin dimethyl ether and tetrahydrofuran, then add methyl allyl trisulfide and thioglycolic acid, and apply UVA light at 35-50 mW / cm 2 Irradiate and stir the reaction for 1.5-2.2 h to prepare intermediate 2; Step A3: Intermediate 1, intermediate 2, p-toluenesulfonic acid and anhydrous toluene are mixed, dry nitrogen is introduced for protection, the temperature is raised to 90-100°C and stirred for reaction for 4-5 hours, dicyclohexylcarbodiimide is then added and the temperature is continued to be raised to 110°C for reaction for 1-1.2 hours to prepare a modified flame retardant.

2. The flame retardant lightweight elastomer material according to claim 1, characterized in that: The dosage ratio of o-aminobenzyl alcohol, formaldehyde, sodium bicarbonate and acetone is 0.1 mol: 0.16-0.18 mol: 0.2-0.3 g: 130-170 mL.

3. The flame retardant lightweight elastomer material according to claim 2, characterized in that: The usage ratio of methyl allyl trisulfide, thioglycolic acid, benzoin dimethyl ether and tetrahydrofuran is 0.1 mol: 0.1 mol: 25-35 mg: 80-100 mL.

4. The flame retardant lightweight elastomer material according to claim 3, characterized in that: The usage ratio of intermediate 1, intermediate 2, p-toluenesulfonic acid, dicyclohexylcarbodiimide and anhydrous toluene is 0.1 mol: 0.3 mol: 3.5-4.5 g: 1.8-2.3 g: 350-420 mL.

5. The flame retardant lightweight elastomer material according to claim 1, characterized in that: The polyene crosslinking agent is triallyl isocyanurate.

6. The flame retardant lightweight elastomer material according to claim 1, characterized in that: The accelerator is triphenylphosphine.

7. The flame retardant lightweight elastomer material according to claim 1, characterized in that: The lubricant is ethylene bisstearamide.

8. A method for preparing a flame retardant lightweight elastomer material according to any one of claims 1 to 7, characterized in that: Specifically, the raw materials of various components are mixed evenly, melt-mixed and extruded into pellets using a twin-screw extruder to obtain a flame-retardant lightweight elastomer material.

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