Smoke-suppression flame-retardant elastomer material and preparation method thereof

Abstract

The invention relates to the technical field of high polymer materials, and discloses a smoke-suppression flame-retardant elastomer material and a preparation method thereof. The elastomer material prepared by the invention 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 a modified flame retardant, 2-3 parts of an antioxidant and 3-7 parts of a compatilizer, the material is mainly prepared by taking polypropylene resin and thermoplastic elastomer as main raw materials and adding a modified flame retardant, an antioxidant and a compatilizer, wherein compared with traditional flame retardants such as magnesium hydroxide and ammonium polyphosphate, the modified flame retardant has a higher flame retardant effect and better smoke suppression performance, the dosage is smaller, and mechanical performance reduction caused by too high addition amount is reduced.

Description

Technical Field

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

[0002] Thermoplastic elastomers, a new polymer material between rubber and resin, are a key product in the new materials industry. They possess the excellent properties of traditional cross-linked vulcanized rubber, such as high elasticity, aging resistance, and oil resistance. Thermoplastic elastomer materials can be composed of a continuous phase of polypropylene or polyethylene resin, with the thermoplastic elastomer as the toughening and modifying component. These materials are compounded using a multi-element synergistic modified flame retardant, antioxidant, and compatibilizer. They are suitable for applications requiring stringent flame retardancy and low smoke toxicity, such as wire and cable, building seals, and vehicle interiors.

[0003] Traditional polyolefin elastomers are widely used due to their advantages such as light weight, flexibility and easy processing. However, their inherent flammability, melt dripping and combustion release of high concentrations of smoke and toxic gases (such as CO and hydrocarbons) seriously threaten the safety of personnel and the integrity of equipment. 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 they need to be added in high amounts to be effective, which will lead to the deterioration of the mechanical properties of the material and difficulty in processing; (2) adding halogenated flame retardants (such as decabromodiphenyl ether), although they have high flame retardant efficiency, they release carcinogenic substances when burned and have been restricted for use; (3) conventional smoke suppressants (molybdenum compounds, stannates), when used alone, have limited smoke suppression effect, poor compatibility with the matrix, and are 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 view of the shortcomings of the above-mentioned flame retardants added 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 needs.

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

[0005] In order to solve the above technical problems, the present invention provides a smoke-suppressing and flame-retardant elastomer material and a preparation method thereof.

[0006] The purpose of the present invention can be achieved through the following technical solutions: A smoke-suppressing 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; Furthermore, the thermoplastic elastomer is a mixture of styrene-butadiene-styrene block copolymer and styrene-isoprene-styrene block copolymer, with a mass ratio of 2:1; Furthermore, the antioxidant is one of tributyl phosphite, trioctyl phosphate and antioxidant 2246; Furthermore, the compatibilizer is maleic anhydride grafted POE; The modified flame retardant is prepared by the following steps: Step A1: Sodium N,N-bis(2-hydroxyethyl)-2-aminoethanesulfonate and dioxane are mixed and stirred uniformly, nitrogen is introduced, and the temperature is raised to 55-65° C., triethylchlorosilane is added, and the temperature is raised to 90° C. for reaction for 6-8 hours, followed by rotary evaporation, recrystallization, and drying to obtain a sulfonate derivative; Furthermore, in step A1, the molar ratio of sodium N,N-bis(2-hydroxyethyl)-2-aminoethanesulfonate to triethylchlorosilane is 1:2-2.2; Step A2: 2-methylimidazole and the sulfonate derivative were mixed and stirred in water, which was designated as Solution 1. Zinc nitrate hexahydrate was evenly dispersed in water, and Solution 1 was added. The mixture was reacted at room temperature for 12-18 hours, centrifuged, washed, and freeze-dried to obtain the sulfonate derivative @ZIF-8. Furthermore, in step A2, the mass ratio of the sulfonate derivative, zinc nitrate hexahydrate, and 2-methylimidazole is 0.05-0.1 g:1.1-3.3 g:3.3-9.9 g; Step A3: Mixing the sulfonate derivative @ZIF-8 in water and stirring uniformly, then adding cobalt sulfate and urea and ultrasonically dispersing uniformly, recorded as solution 2; mixing sodium dihydrogen phosphate and sodium lauryl sulfate in water and stirring uniformly, recorded as solution 3; pouring solution 3 into solution 2 and stirring uniformly, then placing in a microwave reactor at 95°C and 900W at a speed of 200 rpm for reaction for 25-35 minutes, filtering, washing, and drying to obtain a modified flame retardant; Furthermore, 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; Furthermore, in step A3 solution 3, the usage ratio of sodium dihydrogen phosphate, sodium lauryl sulfate and water is 0.002-0.004 mol:0.001-0.002 mol:50 mL.

[0007] A method for preparing a smoke-suppressing and flame-retardant elastomer material comprises the following steps: Step S1, uniformly mixing an ethylene-butadiene-styrene block copolymer and a styrene-isoprene-styrene block copolymer at a mass ratio of 2:1 to obtain a thermoplastic elastomer; Step S2, weighing raw materials by weight, adding polypropylene resin and thermoplastic elastomer into an internal mixer, and mixing at 110-120° C. for 6-9 minutes to obtain a premix; Step S3, adding the premix, modified flame retardant, antioxidant and compatibilizer into a twin-screw extruder, extruding and granulating to obtain a smoke-suppressing flame-retardant elastomer material; Furthermore, in step S3, the temperatures of each section of the twin-screw extruder are: zone 1 temperature 190-200°C, zone 2 temperature 200-210°C, zone 3 temperature 210-230°C, zone 4 temperature 220-230°C, die head temperature 220-240°C, and screw speed 350-450r / min.

[0008] Beneficial effects of the present invention: The elastomeric material prepared by the present invention is made of polypropylene resin and thermoplastic elastomer as main raw materials, and is added with a modified flame retardant, an antioxidant and a compatibilizer; among them, the modified flame retardant has a higher flame retardant effect and is used in a smaller amount compared with traditional flame retardants such as magnesium hydroxide and ammonium polyphosphate, thereby reducing the decline in mechanical properties caused by excessive addition.

[0009] The modified flame retardant prepared by the present invention is prepared by first synthesizing a sulfonate derivative containing silicon, nitrogen and a sulfonate structure, then synthesizing the sulfonate derivative @ZIF-8 by a coprecipitation method, and loading it inside and in the gaps of ZIF-8. Then, cobalt phosphate is synthesized in situ on the surface of the sulfonate derivative @ZIF-8 as a substrate. The modified flame retardant can significantly increase the limiting oxygen index of the base material and reduce the heat release rate and smoke emission. The ZIF-8 framework in the modified flame retardant of the present invention is carbonized at high temperature, and its porous structure can serve as a skeleton or template for the formation of a carbon layer, which helps to form a more effective and stable expanded carbon layer structure; the silicon elements inside the ZIF-8 and in the pores tend to migrate to the surface of the material at high temperature, forming a stable silicon-carbon structure or silicon dioxide layer, and combining with the carbon layer generated by cobalt phosphate catalysis, significantly enhancing the strength, density, continuity and thermal stability of the carbon layer, making it less likely to break; the gas generated by the thermal decomposition of the sulfonate can synergistically act with the nitrogen element to dilute the concentration of the combustible gas, thereby reducing smoke, while absorbing heat and lowering the temperature of the material, thereby slowing down the combustion reaction and reducing the generation of smoke; and when the cobalt phosphate decomposes under heat, on the one hand, phosphoric acid / polyphosphoric acid is released, which acts as a strong Lewis acid to catalyze the dehydration, crosslinking and cyclization reactions of the molecular chain, promoting the formation of a carbon-rich carbon layer, and on the other hand, the cobalt ion (Co 2+ / Co 3+) has an excellent ability to catalyze the recombination of free radicals 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 catalytic carbon layer, improve the quality of the carbon layer, and then isolate the diffusion of oxygen into the interior of the material and block the transfer of heat to the interior of the material. At the same time, the carbon layer can adsorb smoke cores and smoke particles, reducing the release of smoke. DETAILED DESCRIPTION

[0010] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0011] Example 1: The modified flame retardant is prepared by the following steps: Step A1, N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid sodium and dioxane were mixed and stirred uniformly, nitrogen was introduced, and the temperature was raised to 55 ° C., triethylsilyl chloride was added, and the temperature was raised to 90 ° C. for reaction for 6 hours, rotary evaporation, recrystallization, and drying to obtain a sulfonate derivative, wherein the molar ratio of N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid sodium and triethylsilyl chloride is 0.1:0.2; Step A2: 2-methylimidazole and the sulfonate derivative were mixed and stirred in water, which was recorded as Solution 1. Zinc nitrate hexahydrate was evenly dispersed in water, and then Solution 1 was added. The mixture was reacted at room temperature for 12 hours, centrifuged, washed, and freeze-dried to obtain the sulfonate derivative @ZIF-8, wherein the mass ratio of the sulfonate derivative, zinc nitrate hexahydrate, and 2-methylimidazole was 0.05 g:1.1 g:3.3 g. Step A3, mixing the sulfonate derivative @ZIF-8 in water and stirring evenly, then adding cobalt sulfate and urea and ultrasonically dispersing them evenly, recorded as solution 2; mixing sodium dihydrogen phosphate and sodium lauryl sulfate in water and stirring evenly, recorded as solution 3; pouring solution 3 into solution 2 and mixing evenly, then placing it in a microwave reactor at 95°C and 900W and stirring at a speed of 200 rpm for 25 minutes, filtering, washing, and drying to obtain a modified flame retardant, wherein the amount ratio of the sulfonate derivative @ZIF-8, water, cobalt sulfate and urea in solution 2 is 0.001 mol:100 mL:0.003 mol:6 g, and the amount ratio of sodium dihydrogen phosphate, sodium lauryl sulfate and water in solution 3 is 0.002 mol:0.001 mol:50 mL.

[0012] Example 2: The modified flame retardant is prepared by the following steps: Step A1, N,N-bis(2-hydroxyethyl)-2-aminoethanesulfonic acid sodium and dioxane were mixed and stirred uniformly, nitrogen was introduced, and the temperature was raised to 60° C., triethylchlorosilane was added, and the temperature was raised to 90° C. for 7 hours, and the mixture was rotary evaporated, recrystallized, and dried to obtain a sulfonate derivative, wherein the molar ratio of N,N-bis(2-hydroxyethyl)-2-aminoethanesulfonic acid sodium and triethylchlorosilane was 0.1:0.21; Step A2: 2-methylimidazole and the sulfonate derivative were mixed and stirred in water, which was recorded as Solution 1. Zinc nitrate hexahydrate was evenly dispersed in water, and then Solution 1 was added. The mixture was reacted at room temperature for 14 hours, centrifuged, washed, and freeze-dried to obtain the sulfonate derivative @ZIF-8. The mass ratio of the sulfonate derivative, zinc nitrate hexahydrate, and 2-methylimidazole was 0.075 g:2.2 g:6.6 g. Step A3, mixing the sulfonate derivative @ZIF-8 in water and stirring evenly, then adding cobalt sulfate and urea and ultrasonically dispersing them evenly, recorded as solution 2; mixing sodium dihydrogen phosphate and sodium lauryl sulfate in water and stirring evenly, recorded as solution 3; pouring solution 3 into solution 2 and mixing evenly, then placing it in a microwave reactor at 95°C and 900W and stirring at a speed of 200 rpm for 30 minutes, filtering, washing, and drying to obtain a modified flame retardant, wherein the amount ratio of the sulfonate derivative @ZIF-8, water, cobalt sulfate and urea in solution 2 is 0.0015 mol:100 mL:0.0045 mol:9 g, and the amount ratio of sodium dihydrogen phosphate, sodium lauryl sulfate and water in solution 3 is 0.003 mol:0.0015 mol:50 mL.

[0013] Example 3: The modified flame retardant is prepared by the following steps: Step A1, N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid sodium and dioxane were mixed and stirred uniformly, nitrogen was introduced, and the temperature was raised to 65 ° C., triethylsilyl chloride was added, and the temperature was raised to 90 ° C. for 8 hours, and the mixture was rotary evaporated, recrystallized, and dried to obtain a sulfonate derivative, wherein the molar ratio of N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid sodium and triethylsilyl chloride was 0.1:0.22; Step A2: 2-methylimidazole and the sulfonate derivative were mixed and stirred in water, which was recorded as Solution 1; zinc nitrate hexahydrate was evenly dispersed in water, and then Solution 1 was added. The mixture was reacted at room temperature for 18 hours, centrifuged, washed, and freeze-dried to obtain the sulfonate derivative @ZIF-8, wherein the mass ratio of the sulfonate derivative, zinc nitrate hexahydrate, and 2-methylimidazole was 0.1 g:3.3 g:9.9 g; Step A3, mixing the sulfonate derivative @ZIF-8 in water and stirring evenly, then adding cobalt sulfate and urea and ultrasonically dispersing them evenly, recorded as solution 2; mixing sodium dihydrogen phosphate and sodium lauryl sulfate in water and stirring evenly, recorded as solution 3; pouring solution 3 into solution 2 and mixing evenly, then placing it in a microwave reactor at 95°C and 900W and stirring at a speed of 200 rpm for 35 minutes, filtering, washing, and drying to obtain a modified flame retardant, wherein the amount ratio of the sulfonate derivative @ZIF-8, water, cobalt sulfate and urea in solution 2 is 0.002 mol:100 mL:0.006 mol:12 g, and the amount ratio of sodium dihydrogen phosphate, sodium lauryl sulfate and water in solution 3 is 0.004 mol:0.002 mol:50 mL.

[0014] Example 4: A method for preparing a smoke-suppressing flame-retardant elastomer material comprises the following steps: 45 parts of polypropylene resin, 35 parts of thermoplastic elastomer, 5 parts of modified flame retardant prepared in Example 1, 2 parts of tributyl phosphite, and 3 parts of maleic anhydride-grafted POE; Step S1, uniformly mixing an ethylene-butadiene-styrene block copolymer and a styrene-isoprene-styrene block copolymer at a mass ratio of 2:1 to obtain a thermoplastic elastomer; Step S2, weighing raw materials according to weight, adding polypropylene resin and thermoplastic elastomer into an internal mixer, and mixing at 110° C. for 6 minutes to obtain a premix; Step S3: Add the premix, the modified flame retardant prepared in Example 1, tributyl phosphite and maleic anhydride grafted POE into a twin-screw extruder, extrude and granulate to obtain a smoke-suppressing flame-retardant elastomer material, wherein the temperatures of each section of the twin-screw extruder are: zone 1 temperature 190°C, zone 2 temperature 200°C, zone 3 temperature 210°C, zone 4 temperature 220°C, head temperature 220°C, and screw speed 350r / min.

[0015] Example 5: A method for preparing a smoke-suppressing flame-retardant elastomer material comprises the following steps: 50 parts of polypropylene resin, 40 parts of thermoplastic elastomer, 7 parts of the modified flame retardant prepared in Example 2, 2.5 parts of trioctyl phosphite, and 5 parts of maleic anhydride-grafted POE; Step S1, uniformly mixing an ethylene-butadiene-styrene block copolymer and a styrene-isoprene-styrene block copolymer at a mass ratio of 2:1 to obtain a thermoplastic elastomer; Step S2, weighing raw materials according to weight, adding polypropylene resin and thermoplastic elastomer into an internal mixer, and mixing at 115° C. for 8 minutes to obtain a premix; Step S3: Add the premix, the modified flame retardant prepared in Example 2, trioctyl phosphite and maleic anhydride grafted POE into a twin-screw extruder, extrude and granulate to obtain a smoke-suppressing flame-retardant elastomer material, wherein the temperatures of each section of the twin-screw extruder are: zone 1 temperature 195°C, zone 2 temperature 205°C, zone 3 temperature 220°C, zone 4 temperature 225°C, head temperature 230°C, and screw speed 400r / min.

[0016] Example 6: A method for preparing a smoke-suppressing flame-retardant elastomer material comprises the following steps: 55 parts of polypropylene resin, 45 parts of thermoplastic elastomer, 9 parts of modified flame retardant prepared in Example 3, 22463 parts of antioxidant, 7 parts of maleic anhydride grafted POE; Step S1, uniformly mixing an ethylene-butadiene-styrene block copolymer and a styrene-isoprene-styrene block copolymer at a mass ratio of 2:1 to obtain a thermoplastic elastomer; Step S2, weighing raw materials according to weight, adding polypropylene resin and thermoplastic elastomer into an internal mixer, and mixing at 120° C. for 9 minutes to obtain a premix; Step S3: Add the premix, the modified flame retardant prepared in Example 3, antioxidant 2246 and maleic anhydride grafted POE into a twin-screw extruder, extrude and granulate to obtain a smoke-suppressing flame-retardant elastomer material, wherein the temperatures of each section of the twin-screw extruder are: zone 1 temperature 200°C, zone 2 temperature 210°C, zone 3 temperature 230°C, zone 4 temperature 230°C, head temperature 240°C, and screw speed 450r / min.

[0017] Comparative Example 1: This comparative example is a flame-retardant elastomer material. The difference from Example 6 is that ammonium polyphosphate is used instead of the modified flame retardant prepared in Example 3, and the rest are the same.

[0018] Comparative Example 2: This comparative example is a flame-retardant elastomer material. The difference from 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, and the rest are the same.

[0019] Comparative Example 3: This comparative example is a flame-retardant elastomer material. The difference from Example 6 is that the sulfonate derivative prepared in Example 3 is used instead of the modified flame retardant prepared in Example 3, and the rest are the same.

[0020] The flame retardant elastomer materials prepared in Examples 4-6 and Comparative Examples 1-3 were subjected to performance tests: Limiting oxygen index test: refer to GB / T 2406-2009 method for oxygen index test; Vertical burning performance test: vertical burning test is carried out according to GB / T 2408-2008 method; Low smoke performance test: refer to GB / T 8323.2-2008 standard test; The test results are shown in Table 1:

[0021] As can be seen from Table 1, the flame retardant elastomer material prepared by the present invention is tested for limiting oxygen index, and the limiting oxygen index is within the range of (32.2-33.1)%. The vertical combustion performance test shows that the flame retardancy grade is V-0. The low smoke performance test shows that the smoke density is within the range of 46-53. This shows that the elastomer material has excellent flame retardancy and smoke suppression performance.

[0022] The above content is merely an example and explanation of the concept of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in a similar manner. As long as they do not deviate from the scope defined by the concept of the invention, they should all fall within the scope of protection of the present invention.

Claims

1. A smoke suppression and flame retardant elastomer material, characterized in that: The invention 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; The modified flame retardant is prepared by using a sulfonate derivative @ZIF-8 as a base, and reacting cobalt sulfate, urea, sodium dihydrogen phosphate and sodium dodecyl sulfate as raw materials in a microwave reactor at 95°C and 900W for 25-35 minutes. The sulfonate derivative @ZIF-8 is prepared by reacting zinc nitrate hexahydrate, 2-methylimidazole and a sulfonate derivative at room temperature for 12-18 hours. The sulfonate derivative is prepared by reacting sodium N,N-bis(2-hydroxyethyl)-2-aminoethanesulfonate and triethylchlorosilane at 90°C for 6-8 hours.

2. The smoke suppression and flame retardant elastomer material according to claim 1, characterized in that: The modified flame retardant is prepared by the following steps: Step A1: Sodium N,N-bis(2-hydroxyethyl)-2-aminoethanesulfonate and dioxane are mixed and stirred uniformly, nitrogen is introduced, and the temperature is raised to 55-65° C., triethylchlorosilane is added, and the temperature is raised to 90° C. for reaction for 6-8 hours, followed by rotary evaporation, recrystallization, and drying to obtain a sulfonate derivative; Step A2: 2-methylimidazole and the sulfonate derivative were mixed and stirred in water, which was designated as Solution 1. Zinc nitrate hexahydrate was evenly dispersed in water, and Solution 1 was added. The mixture was reacted at room temperature for 12-18 hours, centrifuged, washed, and freeze-dried to obtain the sulfonate derivative @ZIF-8. Step A3: The sulfonate derivative @ZIF-8 was mixed and stirred uniformly in water, and then cobalt sulfate and urea were added and ultrasonically dispersed uniformly, which was recorded as solution 2; sodium dihydrogen phosphate and sodium lauryl sulfate were mixed and stirred uniformly in water, which was recorded as solution 3; solution 3 was poured into solution 2 and mixed and stirred uniformly, and then placed in a microwave reactor at 95°C and 900 W for reaction at a speed of 200 rpm for 25-35 minutes, filtered, washed, and dried to obtain a modified flame retardant.

3. The smoke suppression and flame retardant elastomer material according to claim 2, characterized in that: In step A1, the molar ratio of sodium N,N-bis(2-hydroxyethyl)-2-aminoethanesulfonate to triethylchlorosilane is 1:2-2.

2.

4. The smoke suppression and flame retardant elastomer material according to claim 2, characterized in that: In step A2, the mass ratio of the sulfonate derivative, zinc nitrate hexahydrate and 2-methylimidazole is 0.05-0.1 g:1.1-3.3 g:3.3-9.9 g.

5. The smoke suppression and flame retardant elastomer material according to claim 2, characterized in that: 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.

6. The smoke suppression and flame retardant elastomer material according to claim 2, characterized in that: In step A3 solution 3, the usage ratio of sodium dihydrogen phosphate, sodium lauryl sulfate and water is 0.002-0.004 mol:0.001-0.002 mol:50 mL.

7. The smoke suppression and flame retardant elastomer material according to claim 1, characterized in that: 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.

8. The smoke suppression and flame retardant elastomer material according to claim 1, characterized in that: The antioxidant is one of tributyl phosphite, trioctyl phosphate and antioxidant 2246, and the compatibilizer is maleic anhydride grafted POE.

9. A method for preparing the smoke-suppressing and flame-retardant elastomer material according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step S1, uniformly mixing an ethylene-butadiene-styrene block copolymer and a styrene-isoprene-styrene block copolymer at a mass ratio of 2:1 to obtain a thermoplastic elastomer; Step S2, weighing raw materials by weight, adding polypropylene resin and thermoplastic elastomer into an internal mixer, and mixing at 110-120° C. for 6-9 minutes to obtain a premix; Step S3: adding the premix, modified flame retardant, antioxidant and compatibilizer into a twin-screw extruder, extruding and granulating to obtain a smoke-suppressing flame-retardant elastomer material.

10. The method for preparing a smoke-suppressing and flame-retardant elastomer material according to claim 9, characterized in that: In step S3, the temperature of each section of the twin-screw extruder is: zone 1 temperature 190-200°C, zone 2 temperature 200-210°C, zone 3 temperature 210-230°C, zone 4 temperature 220-230°C, die head temperature 220-240°C, and screw speed 350-450r / min.

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