Smoke-suppressing, flame-retardant elastomeric material and method of making same

Abstract

The present application relates to the technical field of high polymer material, and discloses a smoke-suppressing and flame-retardant elastomer material and a preparation method thereof.The elastomer material prepared by the present application comprises the following raw materials by weight: 45-55 parts of polypropylene resin, 35-45 parts of thermoplastic elastomer, 5-9 parts of modified flame retardant, 2-3 parts of antioxidant, and 3-7 parts of compatibilizer;mainly, the polypropylene resin and the thermoplastic elastomer are used as main raw materials, and the modified flame retardant, the antioxidant and the compatibilizer are added;wherein, compared with the traditional magnesium hydroxide, ammonium polyphosphate and other flame retardants, the modified flame retardant has higher flame-retardant effect, better smoke-suppressing performance, and smaller dosage, thereby reducing the mechanical property decline caused by the excessive addition amount.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, specifically to a smoke-suppressing and flame-retardant elastomer material and its preparation method. Background Technology

[0002] Thermoplastic elastomers (TPEs) are a new type of polymer material that lies between rubber and resin. They are a key product in the new materials industry, possessing the excellent properties of traditional cross-linked vulcanized rubber, such as high elasticity, aging resistance, and oil resistance. TPE materials can be composed of polypropylene or polyethylene resin as the continuous phase, with the TPE serving as the toughening and modifying component. They are compounded by introducing multi-element synergistic modified flame retardants, antioxidants, and compatibilizers, making them suitable for applications with stringent requirements for flame retardancy and low smoke toxicity, such as wires and cables, building seals, and vehicle interior trim.

[0003] Traditional polyolefin elastomers are widely used due to their advantages such as light weight, flexibility, and ease of processing. However, their inherent flammability, melt dripping, and the release of high concentrations of smoke and toxic gases (such as CO and hydrocarbons) during combustion seriously threaten personnel safety and equipment integrity. Therefore, it is crucial to improve the smoke suppression and flame retardant properties of thermoplastic elastomer materials. At present, the means to improve the flame retardant and smoke suppression properties are: (1) adding inorganic flame retardants (magnesium hydroxide or aluminum hydroxide), but high addition amounts are required to be effective, which will lead to the deterioration of the mechanical properties of the material and processing difficulties; (2) adding halogenated flame retardants (such as decabromodiphenyl ether), although the flame retardant efficiency is high, it releases carcinogenic substances during combustion and has been restricted from use; (3) conventional smoke suppressants (molybdenum compounds, stannates), the smoke suppression effect is limited when used alone, and the compatibility with the matrix is ​​poor, and it is easy to migrate and precipitate; (4) adding intumescent flame retardants, which have poor dispersibility in polyolefins, strong hygroscopicity, and insufficient suppression of smoke density. Therefore, in order to address the shortcomings of adding flame retardants to polyolefin elastomers, it is necessary to develop an elastomer material with excellent flame retardant properties and good smoke suppression effect to meet practical application requirements.

[0004] The patent application number is disclosed, but it still has the following shortcomings: (1); (2); (3). Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a smoke-suppressing and flame-retardant elastomer material and its preparation method.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A smoke-suppressing and flame-retardant elastomer material comprises the following raw materials in parts by weight: 45-55 parts of polypropylene resin, 35-45 parts of thermoplastic elastomer, 5-9 parts of modified flame retardant, 2-3 parts of antioxidant, and 3-7 parts of compatibilizer.

[0008] Furthermore, the thermoplastic elastomer is a mixture of styrene-butadiene-styrene block copolymer and styrene-isoprene-styrene block copolymer in a mass ratio of 2:1;

[0009] Furthermore, the antioxidant is one of tributyl phosphite, trioctyl phosphate, and antioxidant 2246;

[0010] Furthermore, the compatibilizer is maleic anhydride grafted with POE;

[0011] The modified flame retardant is prepared by the following steps:

[0012] Step A1: Mix sodium N,N-bis(2-hydroxyethyl)-2-aminoethanesulfonate and dioxane evenly, introduce nitrogen gas, and heat to 55-65℃. Then add triethylchlorosilane and heat to 90℃ for 6-8 hours. Rotary evaporate, recrystallize, and dry to obtain the sulfonate derivative.

[0013] Further, in step A1, the molar ratio of sodium N,N-bis(2-hydroxyethyl)-2-aminoethanesulfonate and triethylchlorosilane is 1:2-2.2;

[0014] Step A2: Mix 2-methylimidazole and the sulfonate derivative in water and stir until homogeneous, and label this as solution 1; disperse zinc nitrate hexahydrate evenly in water, add it to solution 1, and react at room temperature for 12-18 hours. Centrifuge, wash, and freeze dry to obtain the sulfonate derivative @ZIF-8.

[0015] Further, in step A2, the mass ratio of the sulfonate derivative, zinc nitrate hexahydrate, and 2-methylimidazole is 0.05-0.1g:1.1-3.3g:3.3-9.9g;

[0016] Step A3: Mix the sulfonate derivative @ZIF-8 in water and stir until homogeneous. Then add cobalt sulfate and urea and disperse evenly by ultrasonication. This is labeled as solution 2. Mix sodium dihydrogen phosphate and sodium dodecyl sulfate in water and stir until homogeneous. This is labeled as solution 3. Pour solution 3 into solution 2 and mix and stir until homogeneous. Then place the mixture in a microwave reactor at 95℃ and 900W and stir at 200rpm for 25-35 minutes. Filter, wash, and dry to obtain the modified flame retardant.

[0017] Further, in step A3 solution 2, the ratio of sulfonate derivative @ZIF-8, water, cobalt sulfate and urea is 0.001-0.002 mol: 100 mL: 0.003-0.006 mol: 6-12 g;

[0018] Furthermore, in step A3 solution 3, the ratio of sodium dihydrogen phosphate, sodium dodecyl sulfate, and water is 0.002-0.004 mol: 0.001-0.002 mol: 50 mL.

[0019] A method for preparing a smoke-suppressing and flame-retardant elastomer material includes the following steps:

[0020] Step S1: Mix the ethylene-butadiene-styrene block copolymer and the styrene-isoprene-styrene block copolymer at a mass ratio of 2:1 to obtain the thermoplastic elastomer.

[0021] Step S2: Weigh the raw materials according to the weight parts, add the polypropylene resin and thermoplastic elastomer into the internal mixer, and mix at 110-120℃ for 6-9 minutes to obtain the premix.

[0022] Step S3: Add the premix, modified flame retardant, antioxidant and compatibilizer to a twin-screw extruder, extrude and granulate to obtain smoke-suppressing and flame-retardant elastomer material;

[0023] Furthermore, in step S3, the temperatures of each section of the twin-screw extruder are as follows: Zone 1 temperature 190-200℃, Zone 2 temperature 200-210℃, Zone 3 temperature 210-230℃, Zone 4 temperature 220-230℃, Die head temperature 220-240℃, and screw speed 350-450 r / min.

[0024] The beneficial effects of this invention are:

[0025] The elastomer material prepared by this invention is made from polypropylene resin and thermoplastic elastomer as the main raw materials, and modified flame retardants, antioxidants and compatibilizers are added. Among them, the modified flame retardant has a higher flame retardant effect and a smaller amount compared with traditional flame retardants such as magnesium hydroxide and ammonium polyphosphate, which reduces the decline in mechanical properties caused by excessive addition.

[0026] The modified flame retardant prepared in this invention first synthesizes sulfonate derivatives containing silicon, nitrogen, and sulfonate structures, and then synthesizes sulfonate derivatives @ZIF-8 using a co-precipitation method, loading them into the interior and voids of ZIF-8. Then, using sulfonate derivatives @ZIF-8 as a substrate, cobalt phosphate is synthesized in situ on its surface to obtain the product. This can significantly improve the limiting oxygen index of the matrix material and reduce the heat release rate and smoke release. The ZIF-8 framework in the modified flame retardant of this invention carbonizes at high temperatures, and its porous structure can serve as a skeleton or template for char layer formation, contributing to the formation of a more efficient and stable expanded char layer structure. Silicon elements within the ZIF-8 and its pores tend to migrate to the material surface at high temperatures, forming a stable silicon-carbon structure or silica layer, and combining with the char layer catalyzed by cobalt phosphate, significantly enhancing the strength, density, continuity, and thermal stability of the char layer, making it less prone to cracking. The gas produced by the thermal decomposition of sulfonates can synergistically dilute the concentration of combustible gases with nitrogen, thereby reducing smoke, while simultaneously absorbing heat and lowering the material temperature, thus slowing down the combustion reaction and reducing smoke generation. When cobalt phosphate decomposes thermally, it releases phosphoric acid / polyphosphoric acid, which acts as a strong Lewis acid catalyzing the dehydration, cross-linking, and cyclization reactions of molecular chains, promoting the formation of a carbon-rich char layer. Furthermore, cobalt ions (Co... 2+ / Co 3+ It has excellent ability to catalyze free radical recombination in gas phase flames. It can promote the combination of active free radicals (H·, HO·, O·) into stable molecules (such as H2O, H2, O2), thereby efficiently terminating the chain combustion reaction. It can also participate in the graphitization process of the carbon layer, improve the quality of the carbon layer, and thus isolate oxygen from diffusion into the material and block heat transfer into the material. At the same time, the carbon layer can adsorb smoke nuclei and smoke particles, reducing the release of smoke. Detailed Implementation

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Example 1: The modified flame retardant was prepared by the following steps:

[0029] Step A1: Sodium N,N-di(2-hydroxyethyl)-2-aminoethanesulfonate and dioxane are mixed and stirred evenly, nitrogen gas is introduced, and the temperature is raised to 55°C. Then triethylchlorosilane is added, and the temperature is raised to 90°C and reacted for 6 hours. The mixture is then rotary evaporated, recrystallized, and dried to obtain the sulfonate derivative. The molar ratio of sodium N,N-di(2-hydroxyethyl)-2-aminoethanesulfonate and triethylchlorosilane is 0.1:0.2.

[0030] Step A2: Mix 2-methylimidazole and the sulfonate derivative in water and stir until homogeneous, and label this as solution 1; disperse zinc nitrate hexahydrate evenly in water, add it to solution 1, and react at room temperature for 12 hours. Centrifuge, wash, and freeze-dry to obtain the sulfonate derivative @ZIF-8, wherein the mass ratio of the sulfonate derivative, zinc nitrate hexahydrate, and 2-methylimidazole is 0.05 g: 1.1 g: 3.3 g.

[0031] Step A3: Mix the sulfonate derivative @ZIF-8 in water and stir until homogeneous. Then add cobalt sulfate and urea and disperse evenly by ultrasonication. This is labeled as solution 2. Mix sodium dihydrogen phosphate and sodium dodecyl sulfate in water and stir until homogeneous. This is labeled as solution 3. Pour solution 3 into solution 2 and mix and stir until homogeneous. Then place the mixture in a microwave reactor at 95℃ and 900W and stir at 200rpm for 25 minutes. Filter, wash, and dry to obtain the modified flame retardant. The ratio of sulfonate derivative @ZIF-8, water, cobalt sulfate, and urea in solution 2 is 0.001mol:100mL:0.003mol:6g. The ratio of sodium dihydrogen phosphate, sodium dodecyl sulfate, and water in solution 3 is 0.002mol:0.001mol:50mL.

[0032] Example 2: The modified flame retardant was prepared by the following steps:

[0033] Step A1: Sodium N,N-di(2-hydroxyethyl)-2-aminoethanesulfonate and dioxane are mixed and stirred evenly, nitrogen gas is introduced, and the temperature is raised to 60°C. Then triethylchlorosilane is added, and the temperature is raised to 90°C and reacted for 7 hours. The mixture is then rotary evaporated, recrystallized, and dried to obtain the sulfonate derivative. The molar ratio of sodium N,N-di(2-hydroxyethyl)-2-aminoethanesulfonate and triethylchlorosilane is 0.1:0.21.

[0034] Step A2: Mix 2-methylimidazole and the sulfonate derivative in water and stir until homogeneous, and label this as solution 1; disperse zinc nitrate hexahydrate evenly in water, add it to solution 1, and react at room temperature for 14 hours. Centrifuge, wash, and freeze-dry to obtain the sulfonate derivative @ZIF-8, wherein the mass ratio of the sulfonate derivative, zinc nitrate hexahydrate, and 2-methylimidazole is 0.075 g: 2.2 g: 6.6 g.

[0035] Step A3: Mix the sulfonate derivative @ZIF-8 in water and stir until homogeneous. Then add cobalt sulfate and urea and disperse evenly by ultrasonication. This is labeled as solution 2. Mix sodium dihydrogen phosphate and sodium dodecyl sulfate in water and stir until homogeneous. This is labeled as solution 3. Pour solution 3 into solution 2 and mix and stir until homogeneous. Then place the mixture in a microwave reactor at 95℃ and 900W and stir at 200rpm for 30 minutes. Filter, wash, and dry to obtain the modified flame retardant. The ratio of sulfonate derivative @ZIF-8, water, cobalt sulfate, and urea in solution 2 is 0.0015mol:100mL:0.0045mol:9g. The ratio of sodium dihydrogen phosphate, sodium dodecyl sulfate, and water in solution 3 is 0.003mol:0.0015mol:50mL.

[0036] Example 3: The modified flame retardant was prepared by the following steps:

[0037] Step A1: Sodium N,N-di(2-hydroxyethyl)-2-aminoethanesulfonate and dioxane are mixed and stirred evenly, nitrogen gas is introduced, and the temperature is raised to 65°C. Then triethylchlorosilane is added, and the temperature is raised to 90°C and reacted for 8 hours. The mixture is then rotary evaporated, recrystallized, and dried to obtain the sulfonate derivative. The molar ratio of sodium N,N-di(2-hydroxyethyl)-2-aminoethanesulfonate and triethylchlorosilane is 0.1:0.22.

[0038] Step A2: Mix 2-methylimidazole and the sulfonate derivative in water and stir until homogeneous, and label this as solution 1; disperse zinc nitrate hexahydrate evenly in water, add it to solution 1, and react at room temperature for 18 hours. Centrifuge, wash, and freeze-dry to obtain the sulfonate derivative @ZIF-8, wherein the mass ratio of the sulfonate derivative, zinc nitrate hexahydrate, and 2-methylimidazole is 0.1 g: 3.3 g: 9.9 g.

[0039] Step A3: Mix the sulfonate derivative @ZIF-8 in water and stir until homogeneous. Then add cobalt sulfate and urea and disperse evenly by ultrasonication. This is labeled as solution 2. Mix sodium dihydrogen phosphate and sodium dodecyl sulfate in water and stir until homogeneous. This is labeled as solution 3. Pour solution 3 into solution 2 and mix and stir until homogeneous. Then place the mixture in a microwave reactor at 95℃ and 900W and stir at 200rpm for 35 minutes. Filter, wash, and dry to obtain the modified flame retardant. The ratio of sulfonate derivative @ZIF-8, water, cobalt sulfate, and urea in solution 2 is 0.002mol:100mL:0.006mol:12g. The ratio of sodium dihydrogen phosphate, sodium dodecyl sulfate, and water in solution 3 is 0.004mol:0.002mol:50mL.

[0040] Example 4: A method for preparing a smoke-suppressing and flame-retardant elastomer material includes the following steps:

[0041] 45 parts polypropylene resin, 35 parts thermoplastic elastomer, 5 parts modified flame retardant prepared in Example 1, 2 parts tributyl phosphite, and 3 parts maleic anhydride-grafted POE.

[0042] Step S1: Mix the ethylene-butadiene-styrene block copolymer and the styrene-isoprene-styrene block copolymer at a mass ratio of 2:1 to obtain the thermoplastic elastomer.

[0043] Step S2: Weigh the raw materials according to the weight parts, add the polypropylene resin and thermoplastic elastomer into the internal mixer, and internally mix at 110°C for 6 minutes to obtain the premix.

[0044] Step S3: Add the premix, the modified flame retardant prepared in Example 1, tributyl phosphite, and maleic anhydride-grafted POE to a twin-screw extruder, and extrude and granulate to obtain a smoke-suppressing and flame-retardant elastomer material. The temperatures of each section of the twin-screw extruder are as follows: Zone 1: 190°C, Zone 2: 200°C, Zone 3: 210°C, Zone 4: 220°C, Die head: 220°C, and screw speed: 350 r / min.

[0045] Example 5: A method for preparing a smoke-suppressing and flame-retardant elastomer material includes the following steps:

[0046] 50 parts polypropylene resin, 40 parts thermoplastic elastomer, 7 parts modified flame retardant prepared in Example 2, 2.5 parts trioctyl phosphite, and 5 parts maleic anhydride-grafted POE.

[0047] Step S1: Mix the ethylene-butadiene-styrene block copolymer and the styrene-isoprene-styrene block copolymer at a mass ratio of 2:1 to obtain the thermoplastic elastomer.

[0048] Step S2: Weigh the raw materials according to the weight parts, add the polypropylene resin and thermoplastic elastomer into the internal mixer, and mix at 115°C for 8 minutes to obtain the premix.

[0049] Step S3: Add the premix, the modified flame retardant prepared in Example 2, trioctyl phosphite, and maleic anhydride-grafted POE to a twin-screw extruder, and extrude and granulate to obtain a smoke-suppressing and flame-retardant elastomer material. The temperatures of each section of the twin-screw extruder are as follows: Zone 1: 195°C, Zone 2: 205°C, Zone 3: 220°C, Zone 4: 225°C, Die head: 230°C, and screw speed: 400 r / min.

[0050] Example 6: A method for preparing a smoke-suppressing and flame-retardant elastomer material includes the following steps:

[0051] 55 parts polypropylene resin, 45 parts thermoplastic elastomer, 9 parts modified flame retardant prepared in Example 3, 22463 parts antioxidant, and 7 parts maleic anhydride-grafted POE.

[0052] Step S1: Mix the ethylene-butadiene-styrene block copolymer and the styrene-isoprene-styrene block copolymer at a mass ratio of 2:1 to obtain the thermoplastic elastomer.

[0053] Step S2: Weigh the raw materials according to the weight parts, add the polypropylene resin and thermoplastic elastomer into the internal mixer, and mix at 120°C for 9 minutes to obtain the premix.

[0054] Step S3: Add the premix, the modified flame retardant prepared in Example 3, antioxidant 2246, and maleic anhydride-grafted POE to a twin-screw extruder, and extrude and granulate to obtain a smoke-suppressing and flame-retardant elastomer material. The temperatures of each section of the twin-screw extruder are as follows: Zone 1 temperature 200℃, Zone 2 temperature 210℃, Zone 3 temperature 230℃, Zone 4 temperature 230℃, Die head temperature 240℃, and screw speed 450 r / min.

[0055] Comparative Example 1: This comparative example is a flame-retardant elastomer material. The difference between this example and Example 6 is that ammonium polyphosphate is used instead of the modified flame retardant prepared in Example 3. All other aspects are the same.

[0056] Comparative Example 2: This comparative example is a flame-retardant elastomer material. The difference between this example and Example 6 is that the sulfonate derivative @ZIF-8 prepared in Example 3 is used instead of the modified flame retardant prepared in Example 3. All other aspects are the same.

[0057] Comparative Example 3: This comparative example is a flame-retardant elastomer material. The difference between this example and Example 6 is that the sulfonate derivative prepared in Example 3 is used instead of the modified flame retardant prepared in Example 3. All other aspects are the same.

[0058] The flame-retardant elastomer materials prepared in Examples 4-6 and Comparative Examples 1-3 were subjected to performance tests:

[0059] Limiting oxygen index test: The oxygen index test shall be conducted in accordance with the method of GB / T 2406-2009;

[0060] Vertical burning performance test: The vertical burning test shall be conducted in accordance with the method of GB / T 2408-2008;

[0061] Low smoke performance test: Tested according to GB / T 8323.2-2008 standard;

[0062] The test results are shown in Table 1:

[0063]

[0064] As can be seen from Table 1, the flame-retardant elastomer material prepared by this invention has a limiting oxygen index in the range of (32.2-33.1)% after testing; a flame retardancy rating of V-0 after testing vertical burning performance; and a smoke density in the range of 46-53 after testing low smoke performance. This indicates that the elastomer material has excellent flame retardant properties and excellent smoke suppression properties.

[0065] The above content is merely an example and illustration of the concept of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the scope defined by the inventive concept, they should all fall within the protection scope of the present invention.

Claims

1. A smoke-suppressing, flame-retardant elastomeric material, characterized in that, The raw materials include the following components by weight: polypropylene resin 45-55 parts, thermoplastic elastomer 35-45 parts, modified flame retardant 5-9 parts, antioxidant 2-3 parts, and compatibilizer 3-7 parts; The modified flame retardant is prepared by using sulfonate derivative ZIF-8 as a substrate, and using cobalt sulfate, urea, sodium dihydrogen phosphate and sodium dodecyl sulfate as raw materials, and reacting in a 95℃, 900W microwave reactor for 25-35min; the sulfonate derivative ZIF-8 is prepared by reacting zinc nitrate hexahydrate, 2-methyl imidazole and sulfonate derivative at room temperature for 12-18h; the sulfonate derivative is prepared by reacting N,N-di(2-hydroxyethyl)-2-aminoethanesulfonic acid sodium and triethylchlorosilane at 90℃ for 6-8h; The thermoplastic elastomer is a mixture of styrene-butadiene-styrene block copolymer and styrene-isoprene-styrene block copolymer, and the mass ratio of the two is 2:

1.

2. A smoke-suppressing, flame-retardant elastomeric material according to claim 1, wherein The modified flame retardant is prepared by the following steps: In step A1, N,N-di(2-hydroxyethyl)-2-aminoethanesulfonic acid sodium and triethylchlorosilane are mixed and stirred uniformly, nitrogen is introduced, and the temperature is raised to 55-65℃, then triethylchlorosilane is added, and the temperature is raised to 90℃ for 6-8h, rotary evaporation, recrystallization, and drying to obtain the sulfonate derivative; In step A2, 2-methyl imidazole and the sulfonate derivative are mixed and stirred uniformly in water, denoted as solution 1; zinc nitrate hexahydrate is dispersed uniformly in water, then solution 1 is added, and the reaction is carried out at room temperature for 12-18h, centrifugation, washing, and freeze-drying to obtain the sulfonate derivative ZIF-8; In step A3, the sulfonate derivative ZIF-8 is mixed and stirred uniformly in water, then cobalt sulfate and urea are ultrasonically dispersed uniformly, denoted as solution 2; sodium dihydrogen phosphate and sodium dodecyl sulfate are mixed and stirred uniformly in water, denoted as solution 3; solution 3 is poured into solution 2 and mixed and stirred uniformly, then placed in a 95℃, 900W microwave reactor and stirred at a speed of 200rpm for 25-35min, filtered, washed, and dried to obtain the modified flame retardant.

3. A smoke-suppressing, flame-retardant elastomeric material according to claim 2, wherein In step A1, the molar ratio of N,N-di(2-hydroxyethyl)-2-aminoethanesulfonic acid sodium to triethylchlorosilane is 1:2-2.

2.

4. A smoke-suppressing, flame-retardant elastomeric material according to claim 2, wherein In step A2, the mass ratio of the sulfonate derivative, zinc nitrate hexahydrate and 2-methyl imidazole is 0.05-0.1g:1.1-3.3g:3.3-9.9g.

5. A smoke-suppressing, flame-retardant elastomeric material according to claim 2 wherein, In solution 2 of step A3, the amount ratio of the sulfonate derivative ZIF-8, water, cobalt sulfate and urea is 0.001-0.002mol:100mL:0.003-0.006mol:6-12g.

6. A smoke-suppressing, flame-retardant elastomeric material according to Claim 2, wherein In solution 3 of step A3, the amount ratio of sodium dihydrogen phosphate, sodium dodecyl sulfate and water is 0.002-0.004mol:0.001-0.002mol:50mL.

7. A smoke-suppressing, flame-retardant elastomeric material according to Claim 1, wherein The antioxidant is one of tributyl phosphite, trioctyl phosphate and antioxidant 2246, and the compatibilizer is maleic anhydride grafted POE.

8. A process for the preparation of a smoke-suppressing, flame-retardant elastomeric material according to any one of claims 1 to 7, characterized in that The method comprises the following steps: Step S1, ethylene-butadiene-styrene block copolymer and styrene-isoprene-styrene block copolymer are mixed uniformly at a mass ratio of 2:1, to obtain a thermoplastic elastomer; Step S2, the raw materials are weighed, and the polypropylene resin and the thermoplastic elastomer are added into a banbury mixer, and are mixed at 110-120 ℃ for 6-9 min, to obtain a premix; Step S3, the premix, the modified flame retardant, the antioxidant and the compatilizer are added into a double-screw extruder, and are extruded and granulated, to obtain a smoke-suppressing flame-retardant elastomer material.

9. A process for the preparation of a smoke-suppressing, flame-retardant elastomeric material according to claim 8, characterized in that, In the step S3, the temperature of each section of the double-screw extruder is as follows: the temperature of zone 1 is 190-200 ℃, the temperature of zone 2 is 200-210 ℃, the temperature of zone 3 is 210-230 ℃, the temperature of zone 4 is 220-230 ℃, the temperature of the die head is 220-240 ℃, and the screw rotation speed is 350-450 r / min.

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