Environment-friendly flame-retardant soundproof composite material and preparation method and application thereof

Abstract

The application belongs to the technical field of polymer composite materials, and particularly relates to an environment-friendly flame-retardant sound-insulation composite material and a preparation method and application thereof. The raw material of the environment-friendly flame-retardant sound-insulation material comprises the following components in percentage by mass: 60-80% of a polyolefin elastomer, 17-30% of a modified ZIF-8 material and 1-10% of mica flakes; the modified ZIF-8 material comprises ZIF-8, a hypophosphite flame retardant, a borate flame retardant and an ethylene-maleic anhydride copolymer. The environment-friendly flame-retardant sound-insulation composite material provided by the application can well balance the flame retardancy, sound-insulation performance and mechanical properties, and has a simple preparation process and a good application prospect.

Description

Technical Field

[0001] This invention belongs to the field of polymer composite materials technology, specifically relating to an environmentally friendly flame-retardant and sound-insulating composite material, its preparation method, and its application. Background Technology

[0002] Polyolefin elastomers (POEs), as thermoplastic elastomers, combine the high elasticity of traditional vulcanized rubber with the good processability of ordinary plastics, showing great application potential in fields such as automotive parts. However, POE itself is a flammable material with a low limiting oxygen index, making it difficult to meet the flame-retardant performance requirements of materials in applications such as automotive interiors. Meanwhile, with the rapid development of the automotive industry, its standards for driving comfort and safety are constantly increasing. In addition to high flame retardancy, automotive interior materials also need to possess certain sound insulation and mechanical properties. Currently, POE still has limitations in flame retardancy, sound insulation, and mechanical properties, severely restricting its promotion and application. Summary of the Invention

[0003] In view of the shortcomings of existing POE materials in terms of flame retardancy, sound insulation and mechanical properties, the present invention aims to provide an environmentally friendly flame retardant and sound insulation material, its preparation method and application.

[0004] The first aspect of this invention provides an environmentally friendly flame-retardant and sound-insulating material, wherein the raw materials of the environmentally friendly flame-retardant and sound-insulating material include the following components by mass percentage: 60-80% polyolefin elastomer, 17-30% modified ZIF-8 material and 1-10% mica flakes; wherein the modified ZIF-8 material includes ZIF-8, hypophosphite flame retardant, borate flame retardant and ethylene maleic anhydride copolymer.

[0005] The environmentally friendly flame-retardant and sound-insulating composite material (hereinafter referred to as NS material) provided by this invention uses polyolefin elastomer as the matrix and is compounded with modified ZIF-8 material and mica sheets, effectively balancing flame retardancy, sound insulation performance, and mechanical properties. Among them, the modified ZIF-8 material and mica sheets play a synergistic role in sound insulation performance: the modified ZIF-8 material, with its porous structure, mainly enhances the absorption and dissipation of mid-to-high frequency sound waves; while the mica sheets can effectively enhance the blocking and attenuation of low-frequency sound waves. Together, they improve the broadband and efficient noise reduction of NS material across the entire frequency range, especially in the high and low frequency ranges. Furthermore, the ZIF-8 skeleton in the modified ZIF-8 material can absorb some heat during thermal decomposition, and its decomposition products (such as zinc oxide) can effectively catalyze hypophosphite flame retardants (e.g., aluminum hypophosphite) to accelerate dehydration and form a dense carbon layer. At the same time, it can also catalyze the decomposition of borate flame retardants to form a borosilicate glassy coating layer. The dense carbon layer and glassy coating layer can effectively insulate heat and oxygen, thereby significantly improving the overall flame retardant effect of the NS material.

[0006] This invention designs a modified ZIF-8 material with a core-shell structure. The modified ZIF-8 material uses ZIF-8 as the core, coated with ethylene-maleic anhydride copolymer (EMA), and is compounded with hypophosphite and borate flame retardants. In this structure, the maleic anhydride groups in the EMA segments can form strong interactions (such as hydrogen bonds) with the ZIF-8 surface, constructing a complete coating layer. Simultaneously, its vinyl segments significantly improve the interfacial compatibility between the modified particles and the polyolefin elastomer matrix, ensuring uniform dispersion of ZIF-8 and the two flame retardants in the matrix. This effectively solves the problem of traditional flame retardants easily agglomerating, leading to deterioration of material mechanical properties, thus achieving a balance between flame retardant modification and mechanical properties. Furthermore, due to the improved stability of the matrix structure, the modified ZIF-8 and mica sheets can effectively exert their synergistic sound insulation effects.

[0007] The mass percentage of the polyolefin elastomer can be, for example, but not limited to, 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, or any range between any two of the above values. The mass percentage of the modified ZIF-8 material can be, for example, but not limited to, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, or any range between any two of the above values. The mass percentage of the mica sheet can be, for example, but not limited to, 1.0%, 1.5%, 2.0%, 2.5%, 3.0%, 3.5%, 4.0%, 4.5%, 5.0%, 5.5%, 6.0%, 6.5%, 7.0%, 7.5%, 8.0%, 8.5%, 9.0%, 9.5%, 10.0%, or any range between any two of the above values.

[0008] In some preferred embodiments, the environmentally friendly flame-retardant sound-insulating material comprises the following components by weight percentage: 66-75% polyolefin elastomer, 18-27% modified ZIF-8 material, and 6-8% mica sheets.

[0009] The polyolefin elastomer includes at least one of ethylene-octene copolymer and ethylene-butene copolymer.

[0010] In some embodiments, the modified ZIF-8 material comprises, by weight percentage, the following components: 50-65% ZIF-8, 15-25% hypophosphite flame retardant, 10-16% borate flame retardant, and 10-25% ethylene maleic anhydride copolymer.

[0011] The mass percentage of ZIF-8 can be, for example, but not limited to, 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, or any range between any two of the above values. The mass percentage of the hypophosphite flame retardant can be, for example, but not limited to, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, or any range between any two of the above values. The mass percentage of the borate flame retardant can be, for example, but not limited to, 10%, 11%, 12%, 13%, 14%, 15%, 16%, or any range between any two of the above values. The mass percentage of the ethylene-maleic anhydride copolymer can be, for example, but not limited to, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, or any range between any two of the above values.

[0012] In some preferred embodiments, the modified ZIF-8 material comprises, by weight percentage, the following components: 52-59% ZIF-8, 15-18% hypophosphite flame retardant, 10-12% borate flame retardant, and 11-22% ethylene maleic anhydride copolymer.

[0013] In some embodiments, the ethylene-maleic anhydride copolymer is an alternating copolymer of ethylene and maleic anhydride in a molar ratio of 1:1.

[0014] In some preferred embodiments, the weight-average molecular weight of the ethylene-maleic anhydride copolymer is 60,000 to 400,000.

[0015] In some preferred embodiments, the weight-average molecular weight of the ethylene-maleic anhydride copolymer is 300,000 to 400,000. Within the above preferred range, the modified ZIF-8 material exhibits superior core-shell structure stability and compatibility with POE, resulting in better mechanical properties, flame retardant effects, and sound insulation performance of the obtained sound insulation material. In some embodiments, the hypophosphite flame retardant includes aluminum hypophosphite.

[0016] In some embodiments, the borate flame retardant includes at least one of zinc borate, magnesium borate, and aluminum borate.

[0017] In some embodiments, the preparation method of the modified ZIF-8 material includes the following steps: S1. Add the ethylene-maleic anhydride copolymer to the solvent and stir at 50-70°C for 0.5-2 hours; S2. Continue to add ZIF-8, hypophosphite flame retardant and borate flame retardant, perform ultrasonic treatment, and then reflux reaction. The reaction temperature is 50~80℃ and the reaction time is 4~8h. After the reaction is completed, centrifuge, wash and dry to obtain the modified ZIF-8 material.

[0018] The second aspect of the present invention provides a method for preparing the above-mentioned environmentally friendly flame-retardant and sound-insulating material, comprising the following steps: adding each raw material into a mixer in proportion, mixing at 140~180℃ for 10~60min, mixing speed of 50~150r / min, to obtain the environmentally friendly flame-retardant and sound-insulating material.

[0019] The third aspect of this invention provides the application of the above-mentioned environmentally friendly flame-retardant and sound-insulating materials in the preparation of automotive interiors and electronic appliance housings.

[0020] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention uses polyolefin elastomer as the matrix and combines it with modified ZIF-8 material and mica sheet to obtain an environmentally friendly flame retardant and sound insulation material that can effectively take into account flame retardancy, sound insulation performance and mechanical properties, and has excellent comprehensive performance.

[0021] (2) The environmentally friendly flame-retardant sound insulation material provided by this invention does not require the addition of plasticizers during preparation, and the preparation process is simple and suitable for industrial production. Furthermore, during use, it does not release irritating gases such as HCl or acetic acid like traditional sound insulation materials such as PVC and EVA, nor does it release fibers that cause skin and respiratory irritation like glass wool and rock wool sound insulation materials. The environmentally friendly flame-retardant sound insulation material provided by this invention is more environmentally friendly and healthier from preparation to use. Detailed Implementation

[0022] The following detailed embodiments further illustrate the content of the present invention. These embodiments do not constitute a limitation on the scope of protection of the present invention. Non-essential modifications and adjustments made by others based on the concept of the present invention still fall within the scope of protection of the present invention. The raw materials, reagents, or devices used in the embodiments are all available from conventional commercial sources or can be obtained through existing technical methods. Unless otherwise specified, the experimental or testing methods are conventional methods in the art.

[0023] The raw material composition and mass percentage of the modified ZIF-8 materials A to E of this invention are shown in Table 1.

[0024] The preparation method of the modified ZIF-8 material includes the following steps: S1. Add ethylene maleic anhydride copolymer (EMA) to tetrahydrofuran at a ratio of 1g:15mL and stir at 60°C for 1h.

[0025] S2. Continue to add ZIF-8, aluminum hypophosphite and zinc borate, sonicate for 20 min to disperse evenly, reflux at 60℃ for 6 h, and then centrifuge, wash and dry in sequence to obtain the modified ZIF-8 material.

[0026] The raw material composition and mass percentage of the environmentally friendly flame-retardant sound insulation material of the present invention are shown in Table 2.

[0027] The preparation method of the environmentally friendly flame-retardant sound-insulating material includes the following steps: POE, modified ZIF-8 material and mica sheets were added to a mixer and mixed at 160°C for 20 minutes with a rotor speed of 80 r / min to obtain the environmentally friendly flame-retardant and sound-insulating material.

[0028] In the components described in each embodiment and comparative example: EMA#1, ethylene-maleic anhydride copolymer, manufactured by Vantrus, USA, brand name ZeMacE400, M w It is 400,000.

[0029] EMA#2, ethylene-maleic anhydride copolymer, manufactured by Vantrus, USA, brand name ZeMacE60, M w It is 60,000.

[0030] ZIF-8#1, manufactured by Jiangsu Xianfeng Nanomaterials Technology Co., Ltd., item number 102755.

[0031] ZIF-8#2, manufactured by Xi'an Qiyue Biotechnology Co., Ltd., product number 59061-53-9.

[0032] POE#1, ethylene octene copolymer, manufactured by Dow Chemical Company, USA, part number 8540.

[0033] POE#2, ethylene-butene copolymer, manufactured by Dow Chemical, product number POE7367.

[0034] Mica sheets, a commercially available product.

[0035] Vinyltrimethoxysilane, a silane coupling agent, a commercially available product.

[0036] Unless otherwise specified, all components and raw materials used in the embodiments and comparative examples of this invention are commercially available, and the same type of components and raw materials are used in each parallel experiment.

[0037] Table 1 Table 2 Comparative Example 1 The only difference between the sound insulation material in this comparative example and that in Example 3 is that modified ZIF-8 material C is replaced by an equal amount of modified material a (i.e., zinc oxide is used to replace ZIF-8 in modified ZIF-8 material C). The remaining components and preparation methods are exactly the same as in Example 3. The composition of the sound insulation material in this comparative example is: 71.4% POE#1, 21.4% modified material a, and 7.2% mica sheets, totaling 100%.

[0038] The method for preparing the sound insulation material includes the following steps: POE#1, modified material a, and mica sheets were added to a mixer and mixed at 160°C for 20 minutes with a rotor speed of 80 r / min to obtain the sound insulation material.

[0039] The composition of the modified material a is shown in Table 1, and the preparation method includes the following steps: S1. Add ethylene maleic anhydride copolymer (EMA) to tetrahydrofuran at a ratio of 1g:15mL and stir at 60°C for 1h.

[0040] S2. Continue to add zinc oxide, aluminum hypophosphite and zinc borate, sonicate for 20 min to disperse evenly, reflux at 60℃ for 6 h, and then centrifuge, wash and dry in sequence to obtain the modified material a.

[0041] Comparative Example 2 The difference between the sound insulation material in this comparative example and that in Example 3 is that, instead of pre-preparing EMA#1, ZIF-8#1, aluminum hypophosphite, and zinc borate into a modified ZIF-8 material C with a core-shell structure, the sound insulation material in this comparative example is directly prepared by mixing EMA#1, ZIF-8#1, aluminum hypophosphite, and zinc borate with POE#1 and mica sheets. The composition of the sound insulation material in this comparative example is: 71.4% POE#1, 3.56% EMA#1, 11.9% ZIF-8#1, 3.56% aluminum hypophosphite, 2.38% zinc borate, and 7.2% mica sheets, totaling 100%.

[0042] The method for preparing the sound insulation material includes the following steps: POE#1, EMA#1, ZIF-8#1, aluminum hypophosphite, zinc borate, and mica flakes were added to a mixer and mixed at 160°C for 20 minutes with a rotor speed of 80 r / min to obtain the sound insulation material.

[0043] Comparative Example 3 The only difference between the sound insulation material in this comparative example and that in Example 3 is that modified ZIF-8 material C is replaced in equal amounts with modified material b (i.e., EMA in modified ZIF-8 material C is replaced with a silane coupling agent). The remaining components and preparation methods are identical to those in Example 3. The sound insulation material in this comparative example consists of: 71.4% POE#1, 21.4% modified material b, and 7.2% mica sheets, totaling 100%.

[0044] The method for preparing the sound insulation material includes the following steps: POE#1, modified material b, and mica flakes were added to a mixer and mixed at 160°C for 20 minutes with a rotor speed of 80 r / min to obtain the sound insulation material.

[0045] The composition of the modified material b is shown in Table 1, and the preparation method includes the following steps: S1. Add vinyltrimethoxysilane to tetrahydrofuran at a ratio of 1g:15mL and stir at 60°C for 1h.

[0046] S2. Continue to add ZIF-8#1, aluminum hypophosphite and zinc borate, sonicate for 20 min to disperse evenly, reflux at 60℃ for 6 h, and then centrifuge, wash and dry in sequence to obtain the modified material b.

[0047] Comparative Example 4 The difference between this comparative example and Example 3 is that no modified ZIF-8 material is added. The sound insulation material in this comparative example consists of 71.4% POE#1 and 28.6% mica sheets, totaling 100%. The preparation method of the sound insulation material includes the following steps: POE#1 and mica sheets were added to a mixer and mixed at 160°C for 20 minutes with a rotor speed of 80 r / min to obtain the sound insulation material.

[0048] Comparative Example 5 The difference between this comparative example and Example 3 is that the amount of modified ZIF-8 material C added is too small. The composition of the sound insulation material in this comparative example is: 76.9% POE#1, 15.4% modified ZIF-8 material C, and 7.7% mica sheets, totaling 100%. The preparation method of the sound insulation material is exactly the same as that in Example 3.

[0049] To verify the performance of the environmentally friendly flame-retardant sound insulation material of the present invention, the sound insulation materials obtained in each embodiment and comparative example were fed into a double cone feeder and extruded into sheets at 140°C. After the extruded sheets were calendered and cooled by three rolls, a sheet material for performance testing was obtained. The specific testing method is as follows: (1) Tensile strength: The test was conducted according to GB / T1040.2, using Type 1 specimens with a thickness of 4 mm, and 5 specimens per group. The specimens were installed on the fixture of the tensile testing machine, ensuring that the specimen axis was aligned with the direction of the tensile force. The tensile rate was set to 50 mm / min, the testing machine was started, and the maximum tensile force and elongation at break were recorded. The tensile strength was calculated based on the original cross-sectional area of ​​the specimen (tensile strength = maximum tensile force / original cross-sectional area). The test results are shown in Table 3.

[0050] (2) Impact strength: Tested according to GB / T1843 using a cantilever beam impact testing machine. Prepare unnotched specimens 80mm long, 10mm wide, and 4mm thick, with 5 specimens per group. Fix the specimens vertically on the clamps of the testing machine, ensuring the specimens are clamped tightly and the force direction is correct. The pendulum energy is 10J. Start the testing machine, and the pendulum impacts the specimen until it breaks. Record the energy consumed during the impact. The formula for calculating impact strength is: Impact strength (kJ / m²) 2 = Impact energy / Original cross-sectional area of ​​the specimen. The average value is taken as the impact strength of the group of specimens. The test results are shown in Table 3.

[0051] (3) Limiting Oxygen Index (LOI): The test was conducted according to GB / T2406.2. A sample with a length of 120 mm, a width of 10 mm ± 0.5 mm, and a thickness of 4 mm ± 0.2 mm was prepared. The sample was vertically fixed in the combustion chamber of the oxygen index tester. The flow rate of the mixed oxygen and nitrogen gas was adjusted so that the oxygen concentration changed at a certain rate. The top of the sample was ignited with an igniter, and the combustion of the sample was observed. When the burning length of the sample reached 50 mm or the burning time reached 3 min, the oxygen concentration at this moment was recorded, which is the oxygen index of the material. The test results are shown in Table 3.

[0052] (4) Flame retardancy rating (UL94): Prepare strip samples with a length of 127 mm, a width of 12.7 mm, and a thickness of 3.2 mm, five samples per group. Fix the sample vertically and ignite it with a specified flame (20 mm high) at the bottom for 10 seconds. Remove the flame and record the self-extinguishing time of the sample. If the sample does not extinguish, ignite it again for 10 seconds and record the second self-extinguishing time and whether any dripping material ignites the cotton 300 mm below. Determine the flame retardancy rating based on the self-extinguishing time and the dripping material. The flame retardancy rating decreases progressively from V-0, V-1, V-2 to HB. The test results are shown in Table 3. V-0: After two 10-second burning tests, the flame extinguishes within 30 seconds and no burning material falls. V-1: After two 10-second burning tests, the flame extinguishes within 60 seconds and no burning material falls. V-2: After two 10-second burning tests, the flame extinguishes within 60 seconds and burning material can fall. HB: For samples 3 to 13 mm thick, the burning rate is less than 40 mm per minute; for samples less than 3 mm thick, the burning rate is less than 70 mm per minute; or extinguish before the 100 mm mark.

[0053] (5) Sound transmission loss (STL): Tested according to GB / T19889.3. Sound transmission loss refers to the ratio of incident sound energy to transmitted sound energy in decibels. The higher the STL value, the better the sound insulation performance of the material. The STL is calculated by measuring the sound pressure level difference on both sides of the material in a test device consisting of a reverberation chamber and an anechoic chamber. A sample with dimensions of 1000mm×1000mm×4mm was prepared, ensuring that the sample surface was flat and free of defects. The sample was installed in the test opening between the reverberation chamber and the anechoic chamber, so that the sample completely covered the opening and was well sealed. A stable sound field was generated in the reverberation chamber using a sound source, and the sound pressure level was measured in the reverberation chamber and the anechoic chamber respectively. Based on the measured sound pressure level, the volume of the reverberation chamber and the anechoic chamber, the sample area and other parameters, the sound transmission loss at <500HZ and >500HZ was calculated. The test results are shown in Table 3.

[0054] Table 3 The results show that the environmentally friendly flame-retardant sound insulation material provided by this invention has good mechanical properties, flame retardancy, and sound insulation properties, with a tensile strength ≥13.5MPa and an impact strength ≥15.8kJ / m. 2 LOI≥27.5%, UL94 rating reaches V-0 and V-1, STL value (<500Hz)≥22.8dB, STL value (>500Hz)≥27.9dB.

[0055] As can be seen from Examples 3 and 7, when the weight-average molecular weight of the ethylene maleic anhydride copolymer is 400,000, the core-shell structure of the obtained modified ZIF-8 material has better stability and better compatibility with POE, resulting in better mechanical properties, flame retardant effect and sound insulation effect of the obtained sound insulation material.

[0056] As shown in Example 3 and Comparative Example 1, when the traditional flame-retardant component zinc oxide replaces ZIF-8, zinc oxide lacks the porous structure and large number of nitrogen atoms of ZIF-8. Therefore, it cannot effectively absorb heat during combustion, and its efficiency in catalyzing the decomposition of hypophosphite and borate flame retardants is poor. Consequently, it cannot effectively form a dense carbon layer and a borosilicate glassy coating, resulting in poor flame-retardant performance. Furthermore, zinc oxide has poor compatibility with ethylene maleic anhydride copolymer and the POE matrix, further affecting the mechanical properties of the material.

[0057] As shown in Example 3 and Comparative Example 2, if the components in the modified ZIF-8 material do not form a core-shell structure and are directly mixed with polyolefin elastomers and mica sheets, the ZIF-8, sodium hypophosphite flame retardant, and borate flame retardant will be unevenly and chaotically dispersed in the system, resulting in their inability to exert a good synergistic effect during combustion. Furthermore, the poor dispersion uniformity of the system further affects the mechanical properties of the sound insulation material.

[0058] As can be seen from Example 3 and Comparative Example 3, when the silane coupling agent vinyltrimethoxysilane is used to replace the ethylene maleic anhydride copolymer, the overall performance of the material decreases due to the poor compatibility of vinyltrimethoxysilane with the components of the system.

[0059] As can be seen from Example 3 and Comparative Example 4, the overall performance of the material decreases when the modified ZIF-8 material is not present in the system.

[0060] As can be seen from Example 3 and Comparative Example 5, the amount of modified ZIF-8 material added needs to be controlled within a certain range. If the amount added is too small, the flame retardant performance and sound insulation performance will decrease.

[0061] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. An environmentally friendly flame-retardant and sound-insulating material, characterized in that, The raw materials of the environmentally friendly flame-retardant sound insulation material include the following components by mass percentage: 60-80% polyolefin elastomer, 17-30% modified ZIF-8 material and 1-10% mica sheet; The modified ZIF-8 material comprises the following components by weight percentage: 50-65% ZIF-8, 15-25% hypophosphite flame retardant, 10-16% borate flame retardant and 10-25% ethylene maleic anhydride copolymer. The ethylene-maleic anhydride copolymer is an alternating copolymer of ethylene and maleic anhydride in a molar ratio of 1:

1. The preparation method of the modified ZIF-8 material includes the following steps: S1. Add the ethylene-maleic anhydride copolymer to the solvent and stir at 50-70°C for 0.5-2 hours; S2. Continue to add ZIF-8, hypophosphite flame retardant and borate flame retardant, perform ultrasonic treatment, and then reflux reaction. The reaction temperature is 50~80℃ and the reaction time is 4~8h. After the reaction is completed, centrifuge, wash and dry to obtain the modified ZIF-8 material.

2. The environmentally friendly flame-retardant and sound-insulating material as described in claim 1, characterized in that, The environmentally friendly flame-retardant and sound-insulating material comprises the following components by weight percentage: 66-75% polyolefin elastomer, 18-27% modified ZIF-8 material, and 6-8% mica sheets.

3. The environmentally friendly flame-retardant and sound-insulating material as described in claim 1, characterized in that, The modified ZIF-8 material comprises the following components by mass percentage: 52-59% ZIF-8, 15-18% hypophosphite flame retardant, 10-12% borate flame retardant, and 11-22% ethylene maleic anhydride copolymer.

4. The environmentally friendly flame-retardant and sound-insulating material as described in claim 1, characterized in that, The weight-average molecular weight of the ethylene-maleic anhydride copolymer is 60,000 to 400,000.

5. The environmentally friendly flame-retardant and sound-insulating material as described in claim 1, characterized in that, The hypophosphite flame retardant includes aluminum hypophosphite, and the borate flame retardant includes at least one of zinc borate, magnesium borate, and aluminum borate.

6. A method for preparing the environmentally friendly flame-retardant and sound-insulating material as described in any one of claims 1 to 5, characterized in that, Includes the following steps: The raw materials are added to a mixer in proportion and mixed at 140~180℃ for 10~60min and at a speed of 50~150r / min to obtain the environmentally friendly flame-retardant sound insulation material.

7. The application of the environmentally friendly flame-retardant and sound-insulating material as described in any one of claims 1 to 5 in the preparation of automotive interiors and electronic and electrical enclosures.

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