Low-atomization polymer foaming material and preparation method thereof

Abstract

The invention relates to a low-atomization polymer foam material and a preparation method thereof. The low-atomization polymer foam material is prepared from the following raw materials in parts by weight: 100 parts of rubber compound B, 0.3-0.5 part of vulcanizing agent sulfur powder, 0.7-0.9 part of odorless DCP, 0.5-0.8 part of vulcanizing agent DM, 5-7 parts of foaming agent OBSH and 4-6 parts of zinc oxide. According to the high-molecular foaming material, the formula is optimized, the flexible expanded graphite powder, the high-temperature-resistant graphite powder and the rutile type titanium dioxide are screened and jointly combined into the functional filler, and the functional filler has good adsorption performance and has obvious adsorption and purification effects on harmful volatile substances.

Description

Technical Field

[0001] This invention relates to the field of foaming materials technology, and in particular to a low-fogging polymer foaming material and its preparation method. Background Technology

[0002] Ethylene propylene diene monomer (EPDM) rubber foam products are widely used in the automotive and electronics industries due to their excellent weather resistance and wide range of high and low temperature resistance. Currently, commercially available EPDM rubber foam materials, after electronic die-cutting and adhesive backing, are used as automotive ventilation hood sponge pads, dashboard sealing strips, headlight housings, and headlight assemblies. The automotive industry has specific requirements regarding the content of volatile condensable substances (FOG value mg / kg). Therefore, research on low-fogging polymer foam materials has broad applicability. Summary of the Invention

[0003] This invention provides a low-fogging polymer foam material and its preparation method to solve the problem that existing EPDM rubber foam materials used in automotive non-metallic parts have a high content of volatile condensable substances (FOG value mg / kg).

[0004] The present invention adopts the following technical solution: A low-fogging polymer foam material, comprising the following raw materials in parts: 100 parts of compound rubber B Sulfur powder as a vulcanizing agent: 0.3-0.5 parts Odorless DCP 0.7-0.9 parts Vulcanizing aid DM 0.5-0.8 parts 5-7 parts of OBSH foaming agent 4-6 parts zinc oxide The compound B comprises 100 parts of mixed powder A, 50-60 parts of EPDM rubber 7001, and 60-80 parts of EPDM-4045M; The mixed powder A includes 10-20 parts of flexible expanded graphite powder, 20-30 parts of high-temperature resistant graphite powder, 25-35 parts of pigment carbon black, 15-20 parts of rutile titanium dioxide, 30-40 parts of barium sulfate, and 50-60 parts of citric acid.

[0005] The preparation method of the mixed powder A is as follows: First, mix 10-20 parts of flexible expanded graphite powder, 20-30 parts of high-temperature resistant graphite powder, 25-35 parts of pigment carbon black, 15-20 parts of rutile titanium dioxide, and 30-40 parts of barium sulfate in a planetary mixer at 30 revolutions per minute for 30 minutes until the powder is evenly mixed. Then, add 50-60 parts of citric acid and mix in the same planetary mixer at 30 revolutions per minute for 60 minutes. Let it stand for 24 hours to obtain mixed powder A.

[0006] The preparation method of the compound B is as follows: Step (1): Add 100 parts of mixed powder A, 50-60 parts of EPDM rubber 7001, and 60-80 parts of EPDM-4045M into the internal mixer. Lower the hammer to two-thirds of its displacement distance. After reacting for a period of time, lower the hammer completely, increase the pressure, raise the hammer, and flip it. Lower the hammer again, raise the hammer, and repeat the kneading process multiple times. During the kneading process, continuously fill the cooling water at 23°C to cool down. Observe the material temperature in the mixing chamber until it reaches 138-142°C, then pour the material to obtain the internally mixed rubber. Step (2): The internally mixed rubber is fed into the open mill. Cooling water is continuously passed through the rollers of the open mill to control the roller thickness. If it is too thin, the mixture is cooled, divided, and left to stand to obtain compound B.

[0007] A method for preparing a low-fogging polymer foam material includes the following steps: Step (1): Add 4-6 parts zinc oxide, 0.3-0.5 parts sulfur powder (vulcanizing agent), 0.7-0.9 parts odorless DCP, 0.5-0.8 parts vulcanizing aid DM, and 5-7 parts foaming agent OBSH to the mixing chamber. Without pressing down the heavy hammer, stir for 2 minutes. Then add 100 parts of compound B. Press down for 220 seconds, raise the heavy hammer for 30 seconds, and flip. Press down the heavy hammer again for 110 seconds, raise the heavy hammer for 20 seconds, and repeat this process 8 times. Press down the heavy hammer for 110 seconds and raise the heavy hammer for 40 seconds to knead. During the kneading process, continuously fill with cooling water to lower the temperature to 23°C. When the mixed material reaches 102°C, pour it out to obtain the compound. Step (2): Put the mixed rubber from the previous step into the open mill. The open mill rollers are continuously circulated with cooling water at 23°C. The roller thickness is controlled at 4mm, and if it is too thin, it is 1.3mm. Cool down, divide, and let stand for 24 hours to obtain mixture C. The material temperature is below 65°C. Step (3): The mixture C with a material temperature below 65℃ from the previous step is put back into the calender. Cooling water at 23℃ is continuously circulated through the calender rollers. The roller thickness is controlled at 0.8mm. Calendering is performed with a thickness of 0.8mm. The mixture is left to stand for 24 hours to cool, and the material temperature is below 40℃. Step (4): Put the compounded rubber from the previous step into the open mill, control the temperature at 70-80℃, and start milling to further mix and preheat the raw materials of each component to obtain the preheated material. Step (5): The preheated material from the previous step is fed into an extruder for extrusion molding, cut, and allowed to stand and cool for 8 hours to obtain a film. The film temperature is below 40℃. Step (6): Load the film from the previous step into a vulcanizing machine, with a hydraulic pressure of 1400±10kg / cm², vulcanize in the mold at 128-132℃ for 50-65 minutes, then release the pressure to obtain the vulcanized foam material. Step (7): Load the primary vulcanized foaming material from the previous step into the foaming machine, with an oil pressure of 50±5 kg / cm², and foam at 145-150℃ for 65-70 minutes in the mold. Release the pressure to obtain the secondary foaming material. Step (8): Allow the secondary foaming material from the previous step to cool naturally at room temperature for 15 days. After the product has fully cooled and shrunk, place it in an oven at 120℃ for 4 hours.

[0008] Step (Nine): Take a sample measuring 24mm × 24mm × 2mm. The sample should first be treated at 80℃ for 2 hours, then cooled for 8 hours, packaged in aluminum foil, and sent for testing according to the FAW-Volkswagen testing method. Atomization value test method: Refer to PV3015-1994 gravimetric method, and test with an atomizer.

[0009] When adding mixed powder A, it is essential to stir thoroughly and let it stand for 24 hours to allow for complete polymerization before using it in the preparation of compound B. During the preparation of compound B, the water temperature should be controlled at 23℃, and the material temperature should reach 138-142℃ before being poured out, and it must be allowed to stand for 24 hours. When preparing compound C, the vulcanizing agent, vulcanizing aid DM, and foaming agent are added to the mixing chamber along with compound B. The first pressurization is 220 seconds, followed by a 30-second rise of the hammer, and then inverting. The hammer is then lowered for 110 seconds, raised for 20 seconds, and this process is repeated 8 times, with the hammer lowered for 110 seconds and raised for 40 seconds for kneading. During kneading, cooling water is continuously supplied to lower the temperature to 23℃. The kneaded material is poured out when it reaches 102℃ to obtain compound C. Precise temperature control and kneading time control are crucial; otherwise, premature scorching will occur.

[0010] As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following advantages: 1. This invention specifically addresses the control of FOG content in EPDM foamed products, relying on the gravimetric method (PV3015-1994) used by FAW-Volkswagen, and employing a fogging instrument for testing. Samples are taken in the form of 24mm × 2mm × 2mm pieces. The samples are first treated at 80℃ for 2 hours, then cooled for 8 hours, packaged in aluminum foil, and sent for testing according to the FAW-Volkswagen testing method: Fogging value test method: Referencing the PV3015-1994 gravimetric method, using a fogging instrument for testing.

[0011] 2. Through formula optimization and selection of better-combined fillers, flexible expanded graphite powder material exhibits higher density, smaller expansion deformation, and greater friction. Flexible graphite is a loose, porous, worm-like material. Due to the unique network formed during the expansion process, it has a large specific surface area and high activity of the resulting fresh surface, thus possessing excellent adsorption properties.

[0012] 3. The specific surface area of ​​flexible expanded graphite powder is generally between 50 and 200 m². 2 / g, suitable for adsorbing non-polar organic macromolecules, especially suitable for adsorbing oily substances on the water surface, but its high-temperature oxidation resistance is poor. Therefore, high-purity and oxidation-resistant graphite material is used, which can be used in high-temperature oxidation environments and has low friction.

[0013] 4. Graphite of varying densities forms a composite filler, promoting excellent sealing and high-temperature oxidation resistance in the product. Good sealing reduces the temperature difference between the lower external temperature and the high temperature of heat sources such as vehicle lights. This resistance to high-temperature oxidation in a confined space further preserves the product, preventing the precipitation of small-molecule volatile substances and thus reducing the amount of condensate. This significantly reduces the risk of fogging, both in gravimetric analysis of post-combustion volatile substance precipitation and in practical applications.

[0014] 5. Rutile titanium dioxide has a significant effect on absorbing moisture and adsorbing volatile condensates; barium sulfate can absorb harmful rays and slow down the aging of products caused by heat radiation and harmful rays from car lights and sunlight; the pigment carbon black Columbia (Bora) Raven P5 Ultra can effectively improve the weather resistance of products to UV irradiation. Flexible expanded graphite powder, high-temperature resistant graphite powder, and rutile titanium dioxide work together as a functional filler with a significant adsorption and purification effect on harmful volatile substances. Detailed Implementation

[0015] Example 1: A low-fogging polymer foam material, comprising the following raw materials in parts: 100 parts of compound rubber B 0.3 parts sulfur powder as a vulcanizing agent Odorless DCP 0.7 parts 0.5 parts of vulcanizing aid DM 5 parts of OBSH foaming agent 4 parts zinc oxide The compound B comprises 100 parts of mixed powder A, 50 parts of EPDM rubber 7001, and 60 parts of EPDM-4045M; The mixed powder A includes 10 parts of flexible expanded graphite powder, 20 parts of high-temperature resistant graphite powder, 25 parts of pigment carbon black (Columbia (Bora) carbon black Raven P5 Ultra), 15 parts of rutile titanium dioxide, 30 parts of barium sulfate, and 50 parts of citric acid.

[0016] The preparation method of the mixed powder A is as follows: First, mix 10 parts of flexible expanded graphite powder, 20 parts of high-temperature resistant graphite powder, 25 parts of pigment carbon black (Columbia (Bora) carbon black Raven P5 Ultra), 15 parts of rutile titanium dioxide, and 30 parts of barium sulfate in a planetary mixer at 30 revolutions per minute for 30 minutes until the powder is evenly mixed. Then, add 50 parts of citric acid and mix in the planetary mixer at 30 revolutions per minute for 60 minutes. Let stand for 24 hours to obtain mixed powder A.

[0017] The preparation method of the compound B is as follows: Step (1): Add 100 parts of mixed powder A, 50 parts of EPDM rubber 7001, and 60 parts of EPDM-4045M into the internal mixer. Lower the hammer to two-thirds of its displacement distance. After reacting for a period of time, lower the hammer completely, increase the pressure, raise the hammer, and flip it. Lower the hammer again, raise the hammer, and repeat the kneading process multiple times. During the kneading process, continuously fill the cooling water at 23°C to cool down. Observe the material temperature in the mixing chamber until it reaches 138°C, then pour the material to obtain the internally mixed rubber. Step (2): The internally mixed rubber is fed into the open mill. Cooling water is continuously passed through the rollers of the open mill to control the roller thickness. If it is too thin, the mixture is cooled, divided, and left to stand to obtain compound B.

[0018] A method for preparing a low-fogging polymer foam material includes the following steps: Step (1): Add 4 parts zinc oxide, 0.3 parts sulfur powder vulcanizing agent, 0.7 parts odorless DCP, 0.5 parts vulcanizing aid DM, and 5 parts foaming agent OBSH to the mixing chamber. Without pressing down the heavy hammer, stir for 2 minutes. Then add 100 parts of compound B. Press down for 220 seconds, raise the heavy hammer for 30 seconds, and flip. Press down the heavy hammer again for 110 seconds, raise the heavy hammer for 20 seconds, and repeat this process 8 times. Press down the heavy hammer for 110 seconds and raise the heavy hammer for 40 seconds to knead. During the kneading process, continuously fill with cooling water to lower the temperature to 23°C. When the mixed material reaches 102°C, pour it out to obtain the compound. Step (2): Put the mixed rubber from the previous step into the open mill. The open mill rollers are continuously circulated with cooling water at 23°C. The roller thickness is controlled at 4mm, and if it is too thin, it is 1.3mm. Cool down, divide, and let stand for 24 hours to obtain mixture C. The material temperature is below 65°C. Step (3): The mixture C with a material temperature below 65℃ from the previous step is put back into the calender. Cooling water at 23℃ is continuously circulated through the calender rollers. The roller thickness is controlled at 0.8mm. Calendering is performed with a thickness of 0.8mm. The mixture is left to stand for 24 hours to cool, and the material temperature is below 40℃. Step (4): Put the compounded rubber from the previous step into the open mill, control the temperature at 70℃, and start milling to further mix and preheat the raw materials of each component to obtain the preheated material. Step (5): The preheated material from the previous step is fed into an extruder for extrusion molding, cut, and allowed to stand and cool for 8 hours to obtain a film. The film temperature is below 40℃. Step (6): Load the film from the previous step into a vulcanizing machine, with a hydraulic pressure of 1400±10kg / cm², vulcanize at 128℃ for 50 minutes in the mold, then release the pressure to obtain the vulcanized foam material. Step (7): Load the primary vulcanized foaming material from the previous step into the foaming machine, with an oil pressure of 50±5 kg / cm², and foam at 145℃ for 65 minutes in the mold. Release the pressure to obtain the secondary foaming material. Step (8): Allow the secondary foaming material from the previous step to cool naturally at room temperature for 15 days. After the product has fully cooled and shrunk, place it in an oven at 120℃ for 4 hours.

[0019] The sample measures 24mm × 24mm × 2mm. The sample is first treated at 80℃ for 2 hours, then cooled for 8 hours, packaged in aluminum foil, and sent for testing according to the FAW-Volkswagen testing method. Atomization value test method: Refer to PV3015-1994 gravimetric method and test with an atomizer.

[0020] Example 2: A low-fogging polymer foam material, comprising the following raw materials in parts: 100 parts of compound rubber B 0.4 parts sulfur powder as a vulcanizing agent Odorless DCP 0.8 parts 0.65 parts of vulcanizing aid DM 6 parts of OBSH foaming agent 5 parts zinc oxide The compound B comprises 100 parts of mixed powder A, 55 parts of EPDM rubber 7001, and 70 parts of EPDM-4045M; The mixed powder A includes 15 parts of flexible expanded graphite powder, 25 parts of high-temperature resistant graphite powder, 30 parts of pigment carbon black (Columbia (Bora) carbon black Raven P5 Ultra), 18 parts of rutile titanium dioxide, 35 parts of barium sulfate, and 55 parts of citric acid.

[0021] The preparation method of the mixed powder A is as follows: First, mix 15 parts of flexible expanded graphite powder, 25 parts of high-temperature resistant graphite powder, 30 parts of pigment carbon black (Columbia (Bora) carbon black Raven P5 Ultra), 18 parts of rutile titanium dioxide, and 35 parts of barium sulfate in a planetary mixer at 30 revolutions per minute for 30 minutes until the powder is evenly mixed. Then, add 55 parts of citric acid and mix in the planetary mixer at 30 revolutions per minute for 60 minutes. Let stand for 24 hours to obtain mixed powder A.

[0022] The preparation method of the compound B is as follows: Step (1): Add 100 parts of mixed powder A, 55 parts of EPDM rubber 7001, and 70 parts of EPDM-4045M into the internal mixer. Lower the hammer to two-thirds of its displacement distance. After reacting for a period of time, lower the hammer completely, increase the pressure, raise the hammer, and flip it. Lower the hammer again, raise the hammer, and repeat the kneading process multiple times. During the kneading process, continuously fill the cooling water at 23°C to cool down. Observe the material temperature in the mixing chamber until it reaches 140°C, then pour the material to obtain the internally mixed rubber. Step (2): The internally mixed rubber is fed into the open mill. Cooling water is continuously passed through the rollers of the open mill to control the roller thickness. If it is too thin, the mixture is cooled, divided, and left to stand to obtain compound B.

[0023] A method for preparing a low-fogging polymer foam material includes the following steps: Step (1): Add 5 parts zinc oxide, 0.4 parts sulfur powder (vulcanizing agent), 0.8 parts odorless DCP, 0.65 parts vulcanizing aid DM, and 6 parts foaming agent OBSH to the mixing chamber. Without pressing down the heavy hammer, stir for 2 minutes. Then add 100 parts of compound B. Press down for 220 seconds, raise the heavy hammer for 30 seconds, and flip. Press down the heavy hammer again for 110 seconds, raise the heavy hammer for 20 seconds, and repeat this process 8 times. Press down the heavy hammer for 110 seconds and raise the heavy hammer for 40 seconds to knead. During the kneading process, continuously fill with cooling water to lower the temperature to 23°C. When the mixed material reaches 102°C, pour it out to obtain the compound. Step (2): Put the mixed rubber from the previous step into the open mill. The open mill rollers are continuously circulated with cooling water at 23°C. The roller thickness is controlled at 4mm, and if it is too thin, it is 1.3mm. Cool down, divide, and let stand for 24 hours to obtain mixture C. The material temperature is below 65°C. Step (3): The mixture C with a material temperature below 65℃ from the previous step is put back into the calender. Cooling water at 23℃ is continuously circulated through the calender rollers. The roller thickness is controlled at 0.8mm. Calendering is performed with a thickness of 0.8mm. The mixture is left to stand for 24 hours to cool, and the material temperature is below 40℃. Step (4): Put the compounded rubber from the previous step into the open mill, control the temperature at 75℃, and start milling to further mix and preheat the raw materials of each component to obtain the preheated material. Step (5): The preheated material from the previous step is fed into an extruder for extrusion molding, cut, and allowed to stand and cool for 8 hours to obtain a film. The film temperature is below 40℃. Step (6): Load the film from the previous step into a vulcanizing machine, with a hydraulic pressure of 1400±10kg / cm², vulcanize at 130℃ for 60 minutes in the mold, then release the pressure to obtain the vulcanized foam material. Step (7): Load the primary vulcanized foaming material from the previous step into the foaming machine, with an oil pressure of 50±5 kg / cm², and foam at 147℃ for 68 minutes in the mold. Release the pressure to obtain the secondary foaming material. Step (8): Allow the secondary foaming material from the previous step to cool naturally at room temperature for 15 days. After the product has fully cooled and shrunk, place it in an oven at 120℃ for 4 hours.

[0024] The sample measures 24mm × 24mm × 2mm. The sample is first treated at 80℃ for 2 hours, then cooled for 8 hours, packaged in aluminum foil, and sent for testing according to the FAW-Volkswagen testing method. Atomization value test method: Refer to PV3015-1994 gravimetric method, and test with an atomizer.

[0025] Example 3: A low-fogging polymer foam material, comprising the following raw materials in parts: 100 parts of compound rubber B 0.5 parts sulfur powder as a vulcanizing agent Odorless DCP 0.9 parts 0.8 parts of vulcanizing aid DM 7 parts of OBSH foaming agent 6 parts zinc oxide The compound B comprises 100 parts of mixed powder A, 60 parts of EPDM rubber 7001, and 80 parts of EPDM-4045M; The mixed powder A includes 20 parts of flexible expanded graphite powder, 30 parts of high-temperature resistant graphite powder, 35 parts of pigment carbon black (Columbia (Bora) carbon black Raven P5 Ultra), 20 parts of rutile titanium dioxide, 40 parts of barium sulfate, and 60 parts of citric acid.

[0026] The preparation method of the mixed powder A is as follows: First, mix 20 parts of flexible expanded graphite powder, 30 parts of high-temperature resistant graphite powder, 35 parts of pigment carbon black (Columbia (Bora) carbon black Raven P5 Ultra), 20 parts of rutile titanium dioxide, and 40 parts of barium sulfate in a planetary mixer at 30 revolutions per minute for 30 minutes until the powder is evenly mixed. Then, add 60 parts of citric acid and mix in the same planetary mixer at 30 revolutions per minute for 60 minutes. Let stand for 24 hours to obtain mixed powder A.

[0027] The preparation method of the compound B is as follows: Step (1): Add 100 parts of mixed powder A, 60 parts of EPDM rubber 7001, and 80 parts of EPDM-4045M into the internal mixer. Lower the hammer to two-thirds of its displacement distance. After reacting for a period of time, lower the hammer completely, increase the pressure, raise the hammer, and flip it. Lower the hammer again, raise the hammer, and repeat the kneading process multiple times. During the kneading process, continuously fill the cooling water at 23°C to cool down. Observe the material temperature in the mixing chamber until it reaches 142°C, then pour the material to obtain the internally mixed rubber. Step (2): The internally mixed rubber is fed into the open mill. Cooling water is continuously passed through the rollers of the open mill to control the roller thickness. If it is too thin, the mixture is cooled, divided, and left to stand to obtain compound B.

[0028] A method for preparing a low-fogging polymer foam material includes the following steps: Step (1): Add 6 parts zinc oxide, 0.5 parts sulfur powder vulcanizing agent, 0.9 parts odorless DCP, 0.8 parts vulcanizing aid DM, and 7 parts foaming agent OBSH to the mixing chamber. Without pressing down the heavy hammer, stir for a period of 2 minutes. Then add 100 parts of compound B. Press down for 220 seconds, raise the heavy hammer for 30 seconds, and flip. Press down the heavy hammer again for 110 seconds, raise the heavy hammer for 20 seconds, and repeat the kneading step 8 times. During the kneading process, continuously fill with cooling water to lower the temperature to 23°C. When the mixed material reaches 102°C, pour it out to obtain the compound. Step (2): Put the mixed rubber from the previous step into the open mill. The open mill rollers are continuously circulated with cooling water at 23°C. The roller thickness is controlled at 4mm, and if it is too thin, it is 1.3mm. Cool down, divide, and let stand for 24 hours to obtain mixture C. The material temperature is below 65°C. Step (3): The mixture C with a material temperature below 65℃ from the previous step is put back into the calender. Cooling water at 23℃ is continuously circulated through the calender rollers. The roller thickness is controlled at 0.8mm. Calendering is performed with a thickness of 0.8mm. The mixture is left to stand for 24 hours to cool, and the material temperature is below 40℃. Step (4): Put the compounded rubber from the previous step into the open mill, control the temperature at 80℃, and start milling to further mix and preheat the raw materials of each component to obtain the preheated material. Step (5): The preheated material from the previous step is fed into an extruder for extrusion molding, cut, and allowed to stand and cool for 8 hours to obtain a film. The film temperature is below 40℃. Step (6): Load the film from the previous step into a vulcanizing machine, with a hydraulic pressure of 1400±10kg / cm², vulcanize at 132℃ for 65 minutes in the mold, then release the pressure to obtain the vulcanized foam material. Step (7): Load the primary vulcanized foaming material from the previous step into the foaming machine, with an oil pressure of 50±5 kg / cm², and foam at 150℃ for 70 minutes in the mold. Release the pressure to obtain the secondary foaming material. Step (8): Allow the secondary foaming material from the previous step to cool naturally at room temperature for 15 days. After the product has fully cooled and shrunk, place it in an oven at 120℃ for 4 hours.

[0029] The sample measures 24mm × 24mm × 2mm. The sample is first treated at 80℃ for 2 hours, then cooled for 8 hours, packaged in aluminum foil, and sent for testing according to the FAW-Volkswagen testing method. Atomization value test method: Refer to PV3015-1994 gravimetric method and test with an atomizer.

[0030] Atomization value test: Remark: (1) 1 mg / kg = 0.0001% (2) MDL = Method detection limit (3) ND = Not detected ( <MDL) (4) "-" = not specified

[0031] Note: (1) MDL = 0.20 mg. The above are merely specific embodiments of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial modifications made to the present invention using this concept shall be considered as infringing upon the protection scope of the present invention.

Claims

1. A low-atomizing high polymer foam material, characterized by, By weight parts, including the following components: Rubber compound B 100 parts; Vulcanization system, wherein the vulcanization system consists of sulfur powder 0.3-0.5 parts, odorless DCP 0.7-0.9 parts and vulcanization aid DM 0.5-0.8 parts; Foaming agent OBSH 5-7 parts; Zinc oxide 4-6 parts; Wherein, the rubber compound B consists of mixed powder A containing functional filler, EPDM rubber 7001 and EPDM-4045M; The functional filler consists of flexible expanded graphite powder, high-temperature resistant graphite powder and rutile titanium dioxide.

2. The low-atomizing high polymer foam material according to claim 1, wherein: In the rubber compound B, the mixed powder A is 100 parts, the EPDM rubber 7001 is 50-60 parts, and the EPDM-4045M is 60-80 parts.

3. The low-atomizing polymer foam material according to claim 1, wherein The mixed powder A includes by weight parts: flexible expanded graphite powder 10-20 parts, high-temperature resistant graphite powder 20-30 parts, pigment carbon black 25-35 parts, rutile titanium dioxide 15-20 parts, barium sulfate 30-40 parts, citric acid 50-60 parts.

4. A low-atomizing EPDM foam material according to claim 2 or 3, characterized in that, The preparation method of the mixed powder A includes: first mixing and stirring the flexible expanded graphite powder, high-temperature resistant graphite powder, pigment carbon black, rutile titanium dioxide and barium sulfate for 30 minutes, then adding citric acid and continuing to stir for 60 minutes, and then standing for 24 hours.

5. A method of producing a low-atomizing polymer foam material according to any one of claims 1 to 4, characterized in that, Including the following steps: S1. Rubber compound B preparation: mixing the mixed powder A, EPDM rubber 7001 and EPDM-4045M in an internal mixer, controlling the temperature by passing 23℃ cooling water in the process, discharging when the material temperature reaches 138-142℃, and obtaining the rubber compound B after opening and cooling; S2. Final mixing: mixing and kneading the zinc oxide, components of the vulcanization system and foaming agent OBSH with the rubber compound B in an internal mixer, controlling the temperature by passing 23℃ cooling water in the process, discharging when the material temperature reaches 102℃, and obtaining the final compound; S3. Shaping and vulcanization foaming: after the final compound is shaped by opening, calendering and extrusion, it is sequentially subjected to primary vulcanization and secondary foaming, the primary vulcanization conditions are: pressure 1400±10 kg / cm², temperature 128-132℃, time 50-65 minutes; the secondary foaming conditions are: pressure 50±5 kg / cm², temperature 145-150℃, time 65-70 minutes; S4. Post-processing and testing: after the foaming material is naturally cooled at room temperature for 15 days, it is subjected to oven treatment, and then sampled and tested for atomization value according to PV3015-1994 weight method.

6. The method for preparing a low-fogging polymer foam material as described in claim 4, characterized in that, In the step S2, the mixing and kneading includes: first putting the zinc oxide, components of the vulcanization system and foaming agent OBSH into the mixing chamber for stirring, then adding the rubber compound B, and going through the kneading program including first pressing for 220 seconds, rising weight for 30 seconds and turning, second pressing for 110 seconds, rising for 20 seconds, and repeating the "pressing for 110 seconds-rising for 40 seconds" cycle multiple times.

7. The method for preparing a low-fogging polymer foam material as described in claim 4, characterized in that: Between steps S2 and S3, there is also a step of opening and pressing the final compound, and controlling the calendering with a roll gap of 4mm under the control of 23℃ cooling water, and then standing for more than 24 hours to make the material temperature below 40℃.

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