Washing machine door seal material formula with plant fragrance and preparation method thereof

Abstract

The invention discloses a washing machine door seal material formula with plant fragrance and a preparation method thereof, and belongs to the technical field of high polymer materials. The washing machine door sealing material is prepared from the following raw materials in parts by mass: 200 parts of EPDM, 30-50 parts of white carbon black, 40-80 parts of argil, 50-70 parts of paraffin oil, 1.5-4.5 parts of a plant flavoring agent, 0.4-2 parts of an antibacterial and mildew-proof agent, 1-2 parts of a vulcanizing agent, 1-2 parts of an anti-aging agent, 6-10 parts of an accelerant, 1-4 parts of a lubricating agent and 5-15 parts of color master batch. The washing machine door seal material prepared by the invention has excellent hardness, density and mechanical properties, also has appropriate plant fragrance, can well cover and remove the odor of the EPDM rubber material, and is simple in preparation method, low in cost and suitable for large-scale production.

Description

Technical Field

[0001] The invention belongs to the technical field of polymer materials, and particularly relates to a formula of a washing machine door sealing material with a plant fragrance and a preparation method thereof. Background Art

[0002] The door seal of the washing machine observation window is a rubber product made of EPDM (ethylene propylene diene monomer rubber) as the main material. It plays the role of sealing and shock absorption and is an important part of the washing machine. Since the door seal rubber products are made of different chemical raw materials mixed at high temperature, and sulfur and accelerators are added to vulcanize and mold at high temperature, the rubber products will slowly release the odor of chemical raw materials during the storage of the washing machine, especially now that the washing machine with a dryer is drying clothes at high temperature during operation, the odor of chemical raw materials will evaporate more quickly. Therefore, the poor customer experience caused by the odor of the washing machine door seal is a pain point in the washing machine industry. The industry has added flavors to the materials, but the mixture of flavors and chemical raw materials has a more bizarre smell and cannot effectively solve this problem. At the same time, the EPDM rubber used in the washing machine door seal needs to be cross-linked with vulcanizers and accelerators at high temperature to make products. Most accelerator chemical raw materials on the market have a strong odor, and the use of multiple accelerators leads to a mixture of multiple chemical odors. Therefore, the final vulcanized door seal products have a strong odor, and it takes several months for the odor to fade.

[0003] To solve this problem, the present invention provides a modified plant fragrance mixed auxiliary agent, which uses EPDM as the main material, adds dispersing and lubricating materials and plant fragrance powder, and combines with adsorbent materials calcium silicate and silicon dioxide to form a plant fragrance agent through physical mixing. This plant fragrance agent is used in the formula of washing machine door seal to improve the smell of the door seal material, changing the unacceptable chemical smell into a fragrant plant smell, and the smell is retained for a long time. Summary of the invention

[0004] The object of the present invention is to provide a formula of a washing machine door seal material with a plant fragrance and a preparation method thereof, so as to solve the problems mentioned in the background technology.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] The first aspect of the present invention provides a formula of a washing machine door seal material with a plant fragrance, which comprises the following raw materials in parts by mass:

[0007] 200 parts of EPDM, 30-50 parts of white carbon black, 40-80 parts of clay, 50-70 parts of paraffin oil, 1.5-4.5 parts of plant flavoring agent, 0.4-2 parts of antibacterial and mildewproof agent, 1-2 parts of vulcanizing agent, 1-2 parts of antioxidant, 6-10 parts of accelerator, 1-4 parts of lubricant, and 5-15 parts of masterbatch.

[0008] As a further embodiment of the present invention, the plant flavoring agent comprises the following raw materials in parts by weight:

[0009] 200 parts of EPDM, 60-80 parts of plant fragrance powder, 15-25 parts of silicon dioxide, 2-8 parts of dispersant, 3-8 parts of lubricant, and 2-6 parts of adsorbent.

[0010] As a further solution of the present invention, the raw material of the EPDM is oil-extended EPDM, and the third monomer is ENB.

[0011] As a further embodiment of the present invention, the antibacterial and antifungal agent is a high-activity broad-spectrum antibacterial agent, and the high-activity broad-spectrum antibacterial agent is at least one of the antibacterial agent AMR-5 and the antibacterial agent JP-017.

[0012] As a further embodiment of the present invention, the antioxidant is at least one of 2-mercaptobenzimidazole and 4,4'-bis(α,α-dimethylbenzyl)diphenylamine.

[0013] As a further embodiment of the present invention, the vulcanizing agent is sulfur.

[0014] As a further embodiment of the present invention, the accelerator is at least one of thiazoles, sulfenamides and thiocarbamates.

[0015] As a further embodiment of the present invention, the lubricant is at least one of zinc stearate, paraffin, and oleamide.

[0016] As a further solution of the present invention, the dispersant is at least one of dispersant 935P and dispersant RL-20.

[0017] As a further embodiment of the present invention, the adsorbent is at least one of calcium silicate and silicon dioxide.

[0018] As a further solution of the present invention, the white carbon black is prepared by calcining precipitated silica and clay.

[0019] As a further embodiment of the present invention, the paraffin oil is a hydrorefined mineral oil.

[0020] A second aspect of the present invention provides a method for preparing a washing machine door seal material formula with a plant fragrance, comprising the following steps:

[0021] S1. Add EPDM, dispersant, lubricant, plant fragrance powder, adsorbent and silicon dioxide into an internal mixer according to the mass ratio, stir under pressure for 3±1 min, lift the fixed bolt to clean and stir under pressure for 3±1 min again, lift the bolt to turn the material and stir under pressure to 100±5°C, unload to an open mixer, pressurize and cool to obtain plant fragrance A;

[0022] S2, put EPDM into an internal mixer and stir under pressure for 2±0.5min, then add white carbon black, 1 / 2 clay, antioxidant, lubricant, antibacterial agent, plant fragrance A, masterbatch, and 1 / 2 paraffin oil into the internal mixer according to the mass ratio, stir under pressure for 3±1min, then add the remaining 1 / 2 clay and 1 / 2 paraffin oil into the internal mixer, stir under pressure for 3±1min, stir under pressure for 5±1min after cleaning, open the door and stir under pressure to 150±5℃, unload the material onto the open mixer, press and cool to obtain the semi-finished rubber mix B;

[0023] S3, putting the cooled semi-finished rubber mix B, accelerator and vulcanizer into an internal mixer according to the mass ratio and stirring under pressure for 2±0.5min, opening the door to turn over the material and stirring under pressure again to 80±5°C, unloading the material to an open mixer, pressing and cooling to obtain a rubber mix C;

[0024] S4. The rubber mixture C prepared above is injected into a mold using an injection vulcanizer, vulcanized and molded at a temperature of 190±5° C., and trimmed to obtain a washing machine door sealing material.

[0025] Beneficial effects of the present invention:

[0026] The raw materials used for making the washing machine door seal material of the present invention are oil-filled EPDM, silicon dioxide, clay, paraffin oil, dispersant, antioxidant, lubricant, antibacterial and mildew-proof agent, accelerator and vulcanizing agent, and plant fragrance agent, and the prepared material has excellent physical strength; at the same time, due to the use of inorganic materials and antibacterial and mildew-proof agent, the door seal for washing machines is prevented from getting moldy during use. In addition, the addition of plant fragrance agent eliminates the smell of chemical raw materials from the washing machine door seal product, especially when the washing machine is working at a higher temperature, the volatilization of the smell of rubber products is accelerated, so that the washing machine door seal has plant fragrance. DETAILED DESCRIPTION

[0027] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Example 1

[0029] This embodiment provides a formula for a washing machine door seal material with a plant fragrance, comprising the following raw materials in parts by weight:

[0030] 200 parts of EPDM, 40 parts of white carbon black, 55 parts of clay, 60 parts of paraffin oil, 1.5 parts of plant flavoring agent, 0.4 parts of antibacterial agent AMR-5, 1 part of sulfur, 1 part of 2-mercaptobenzimidazole, 6 parts of accelerator DM, 1 part of zinc stearate, and 5 parts of masterbatch.

[0031] The plant flavoring agent comprises the following raw materials in parts by weight:

[0032] 200 parts of EPDM, 60 parts of lemon powder plant flavor, 15 parts of silicon dioxide, 2 parts of dispersant 935P, 3 parts of zinc stearate, and 2 parts of calcium silicate.

[0033] The preparation method is as follows:

[0034] S1. Add EPDM, dispersant 935P, zinc stearate, lemon powder plant flavor, calcium silicate and silicon dioxide into an internal mixer according to the mass ratio, stir under pressure for 3 minutes, lift the fixed bolt to clean and stir under pressure for 3 minutes again, lift the bolt to turn the material and stir under pressure to 100° C., unload the material to the open mixer for tableting and cooling to obtain plant flavoring agent A;

[0035] S2, put EPDM into an internal mixer and stir under pressure for 2 minutes, then add white carbon black, 1 / 2 clay, 2-mercaptobenzimidazole, zinc stearate, antibacterial agent AMR-5, plant fragrance A, masterbatch, and 1 / 2 paraffin oil into the internal mixer according to the mass ratio, stir under pressure for 3 minutes, then add the remaining 1 / 2 clay and 1 / 2 paraffin oil into the internal mixer, stir under pressure for 3 minutes, stir under pressure for 5 minutes after cleaning, open the door and stir under pressure to 150°C after turning over the material, unload the material onto the open mixer, press and cool to obtain the semi-finished rubber mix B;

[0036] S3, putting the cooled semi-finished rubber mix B, accelerator DM and sulfur into an internal mixer according to the mass ratio and stirring under pressure for 2 minutes, opening the door to turn over the material and stirring under pressure again to 80° C., unloading the material to an open mixer, pressing and cooling to obtain a rubber mix C;

[0037] S4. The rubber mixture C prepared above is injected into a mold by using an injection vulcanizer, vulcanized and molded at a temperature of 190° C., and trimmed to obtain a washing machine door sealing material.

[0038] Example 2

[0039] Compared with Example 1, the only difference is:

[0040] The plant flavoring agent comprises the following raw materials in parts by weight:

[0041] 200 parts of EPDM, 70 parts of lemon powder plant flavor, 15 parts of silicon dioxide, 2 parts of dispersant 935P, 3 parts of zinc stearate, and 2 parts of calcium silicate.

[0042] Example 3

[0043] Compared with Example 1, the only difference is:

[0044] The plant flavoring agent comprises the following raw materials in parts by weight:

[0045] 200 parts of EPDM, 80 parts of lemon powder plant flavor, 15 parts of silicon dioxide, 2 parts of dispersant 935P, 3 parts of zinc stearate, and 2 parts of calcium silicate.

[0046] Example 4

[0047] Compared with Example 1, the only difference is:

[0048] A formula for a washing machine door seal material with a plant fragrance, comprising the following raw materials in parts by weight:

[0049] 200 parts of EPDM, 45 parts of white carbon black, 70 parts of clay, 60 parts of paraffin oil, 2.5 parts of plant flavoring agent, 0.9 parts of antibacterial agent AMR-5, 1.5 parts of sulfur, 1.2 parts of 2-mercaptobenzimidazole, 8 parts of accelerator DM, 2 parts of zinc stearate, and 8 parts of masterbatch.

[0050] Example 5

[0051] Compared with Example 1, the only difference is:

[0052] A formula for a washing machine door seal material with a plant fragrance, comprising the following raw materials in parts by weight:

[0053] 200 parts of EPDM, 50 parts of white carbon black, 75 parts of clay, 65 parts of paraffin oil, 4.5 parts of plant flavoring agent, 1 part of antibacterial agent AMR-5, 2 parts of sulfur, 1.8 parts of 2-mercaptobenzimidazole, 9 parts of accelerator DM, 3 parts of zinc stearate, and 13 parts of masterbatch.

[0054] Example 6

[0055] Compared with Example 1, the only difference is:

[0056] The preparation method is as follows:

[0057] S1. Add EPDM, dispersant 935P, zinc stearate, lemon powder plant flavor, calcium silicate and silicon dioxide into an internal mixer according to the mass ratio, stir under pressure for 4 minutes, lift the fixed bolt to clean and stir under pressure for 4 minutes again, lift the bolt to turn the material and stir under pressure to 105° C., unload the material to an open mixer for tableting and cooling to obtain plant flavoring agent A;

[0058] S2. Put EPDM into an internal mixer and stir under pressure for 2.5 minutes. Then add white carbon black, 1 / 2 clay, 2-mercaptobenzimidazole, zinc stearate, antibacterial agent AMR-5, plant flavoring agent A, masterbatch and 1 / 2 paraffin oil into the internal mixer according to the mass ratio and stir under pressure for 4 minutes. Then add the remaining 1 / 2 clay and 1 / 2 paraffin oil into the internal mixer and stir under pressure for 3 minutes. After cleaning, stir under pressure for another 6 minutes. Open the door, turn over the material and stir under pressure to 152°C. Unload the material onto the open mixer, pressurize and cool to obtain the semi-finished rubber mix B.

[0059] Example 7

[0060] Compared with Example 1, the only difference is:

[0061] The preparation method is as follows:

[0062] S3, putting the cooled semi-finished rubber mix B, accelerator DM and sulfur into an internal mixer according to the mass ratio and stirring under pressure for 2.5 minutes, opening the door to turn over the material and stirring under pressure again to 85° C., unloading the material to an open mixer, pressing and cooling to obtain a rubber mix C;

[0063] S4. The rubber mixture C prepared above is injected into a mold by using an injection vulcanizer, vulcanized and molded at a temperature of 193° C., and trimmed to obtain a washing machine door sealing material.

[0064] Comparative Example 1

[0065] This comparative example provides a formula of a washing machine door seal material with a plant fragrance, comprising the following raw materials in parts by weight:

[0066] 200 parts of EPDM, 40 parts of white carbon black, 55 parts of clay, 60 parts of paraffin oil, 0.4 parts of antibacterial agent AMR-5, 1 part of sulfur, 1 part of 2-mercaptobenzimidazole, 6 parts of accelerator DM, 1 part of zinc stearate, and 5 parts of masterbatch.

[0067] The preparation method is as follows:

[0068] S1. Put EPDM into an internal mixer and stir under pressure for 2 minutes. Then add white carbon black, 1 / 2 clay, 2-mercaptobenzimidazole, zinc stearate, antibacterial agent AMR-5, masterbatch, and 1 / 2 paraffin oil into the internal mixer according to the mass ratio, stir under pressure for 3 minutes, then add the remaining 1 / 2 clay and 1 / 2 paraffin oil into the internal mixer, stir under pressure for 3 minutes, stir under pressure for 5 minutes after cleaning, open the door and stir under pressure to 150°C after turning over the material, unload the material onto the open mixer, press and cool to obtain the semi-finished rubber compound B;

[0069] S2, putting the cooled semi-finished rubber mix B, accelerator DM and sulfur into an internal mixer according to the mass ratio and stirring under pressure for 2 minutes, opening the door to turn over the material and stirring under pressure again to 80° C., unloading the material to an open mixer, pressing and cooling to obtain a rubber mix C;

[0070] S3. The rubber mixture C prepared above is injected into a mold by using an injection vulcanizer, vulcanized and molded at a temperature of 190° C., and trimmed to obtain a washing machine door sealing material.

[0071] Comparative Example 2

[0072] Compared with Example 1, the only difference is:

[0073] 1.5 parts of plant flavoring agent was replaced by 0.8 parts of plant flavoring agent, and the remaining raw materials and steps were the same as those in Example 1.

[0074] Comparative Example 3

[0075] Compared with Example 1, the only difference is:

[0076] 1.5 parts of plant flavoring agent was replaced by 5.5 parts of plant flavoring agent, and the remaining raw materials and steps were the same as those in Example 1.

[0077] Comparative Example 4

[0078] Compared with Example 1, the only difference is:

[0079] The plant flavoring agent comprises the following raw materials in parts by weight:

[0080] 200 parts of EPDM, 40 parts of lemon powder plant flavor, 15 parts of silicon dioxide, 2 parts of dispersant 935P, 3 parts of zinc stearate, and 2 parts of calcium silicate.

[0081] Comparative Example 5

[0082] Compared with Example 1, the only difference is:

[0083] The plant flavoring agent comprises the following raw materials in parts by weight:

[0084] EPDM 180 parts, lemon powder plant essence 60 parts, silicon dioxide 10 parts, dispersant 935P 1 part, zinc stearate 2 parts, calcium silicate 2 parts.

[0085] Comparative Example 6

[0086] Compared with Example 1, the only difference is:

[0087] A formula for a washing machine door seal material with a plant fragrance, comprising the following raw materials in parts by weight:

[0088] EPDM 180 parts, white carbon black 30 parts, clay 55 parts, paraffin oil 60 parts, plant flavoring agent 1.5 parts, antibacterial agent AMR-5 0.4 parts, sulfur 1 part, 2-mercaptobenzimidazole 1 part, accelerator DM 6 parts, zinc stearate 1 part, masterbatch 5 parts.

[0089] Comparative Example 7

[0090] Compared with Example 1, the only difference is:

[0091] A formula for a washing machine door seal material with a plant fragrance, comprising the following raw materials in parts by weight:

[0092] 220 parts of EPDM, 40 parts of white carbon black, 88 parts of clay, 92 parts of paraffin oil, 1.5 parts of plant flavoring agent, 0.4 parts of antibacterial agent AMR-5, 1 part of sulfur, 1 part of 2-mercaptobenzimidazole, 6 parts of accelerator DM, 1 part of zinc stearate, and 5 parts of masterbatch.

[0093] Comparative Example 8

[0094] Compared with Example 1, the only difference is:

[0095] The preparation method is as follows:

[0096] S1. Add EPDM, dispersant 935P, zinc stearate, lemon powder plant flavor, calcium silicate and silicon dioxide into an internal mixer according to the mass ratio, stir under pressure for 1 minute, lift the fixed bolt to clean and stir under pressure for 3 minutes again, lift the bolt to turn the material over and stir under pressure to 90° C., unload the material to an open mixer for tableting and cooling to obtain plant flavoring agent A;

[0097] S2. Put EPDM into an internal mixer and stir under pressure for 1 minute. Then add white carbon black, 1 / 2 clay, 2-mercaptobenzimidazole, zinc stearate, antibacterial agent AMR-5, plant flavoring agent A, masterbatch and 1 / 2 paraffin oil into the internal mixer according to the mass ratio and stir under pressure for 1.5 minutes. Then add the remaining 1 / 2 clay and 1 / 2 paraffin oil into the internal mixer and stir under pressure for 3 minutes. After cleaning, stir under pressure for another 5 minutes. Open the door, turn over the material and stir under pressure to 140°C. Unload the material onto the open mixer, pressurize and cool to obtain the semi-finished rubber mix B.

[0098] Comparative Example 9

[0099] Compared with Example 1, the only difference is:

[0100] The preparation method is as follows:

[0101] S3, putting the cooled semi-finished rubber mix B, accelerator DM and sulfur into an internal mixer according to the mass ratio and stirring under pressure for 1 minute, opening the door to turn over the material and stirring under pressure again to 70° C., unloading the material to an open mixer, pressing and cooling to obtain a rubber mix C;

[0102] S4. The rubber mixture C prepared above is injected into a mold by an injection vulcanizer, vulcanized and molded at a temperature of 180° C., and trimmed to obtain a washing machine door sealing material.

[0103] The washing machine door seal materials obtained in Examples 1 to 7 and Comparative Examples 1 to 9 were subjected to the following performance tests:

[0104] 1) Hardness: Tested according to standard GB / T 531.1-2008;

[0105] 2) Density: tested according to the immersion method of standard GB / T 533-2008;

[0106] 3) Tear strength: Tested according to GB / T 529-2008 "Determination of tear strength of vulcanized rubber or thermoplastic rubber (right angle)";

[0107] 4) Elongation at break: Tested according to GB / T 528-2009 "Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber";

[0108] 5) Tensile strength: tested according to standard GB / T 528-2009 "Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber";

[0109] 6) Odor: After the obtained product has been left for 3 months, 20 g is taken out and placed in a sealed container. After 2 hours at 65°C, the container is opened and the odor is immediately smelled.

[0110] The above results are shown in Table 1:

[0111] Table 1

[0112]

[0113]

[0114] It can be seen from the data in Table 1 that compared with the washing machine door seal material prepared in Example 1, no plant fragrance is added to the raw materials in Comparative Example 1, 0.8 parts of plant fragrance are added in Comparative Example 2, and 5.5 parts of plant fragrance are added in Comparative Example 3. The washing machine door seal materials obtained in Comparative Examples 1 and 2 have the smell of chemical raw materials, and Comparative Example 3 has a strong plant fragrance, while the washing machine door seal material obtained in Example 1 has excellent mechanical properties, and the smell of chemical raw materials is eliminated, and has a suitable plant fragrance. Compared with Examples 1-7, in the process of preparing the washing machine door seal material in Comparative Examples 4-9, the composition, ratio and parameter setting of the raw materials and the preparation process are all beyond the scope provided in the present invention, and the hardness, density, mechanical properties and smell of the washing machine door seal material obtained in Comparative Examples 4-5 are all worse than those in Examples 1-7. In summary, the washing machine door seal material prepared by the present invention has excellent hardness, density and mechanical properties, and has a suitable plant fragrance, which can well cover and remove the odor of EPDM rubber materials, and its preparation method is simple, economical, and suitable for large-scale production.

[0115] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0116] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A formula for a washing machine door seal material with a plant scent, characterized in that: The following raw materials are included by mass: 200 parts of EPDM, 30-50 parts of white carbon black, 40-80 parts of clay, 50-70 parts of paraffin oil, 1.5-4.5 parts of plant flavoring agent, 0.4-2 parts of antibacterial and mildewproof agent, 1-2 parts of vulcanizing agent, 1-2 parts of antioxidant, 6-10 parts of accelerator, 1-4 parts of lubricant, and 5-15 parts of masterbatch.

2. The formula of a washing machine door seal material with plant fragrance according to claim 1, characterized in that: The plant flavoring agent comprises the following raw materials in parts by weight: 200 parts of EPDM, 60-80 parts of plant fragrance powder, 15-25 parts of silicon dioxide, 2-8 parts of dispersant, 3-8 parts of lubricant, and 2-6 parts of adsorbent.

3. The formula of a washing machine door seal material with plant fragrance according to claim 1, characterized in that: The antibacterial and antifungal agent is a high-activity broad-spectrum antibacterial agent, and the high-activity broad-spectrum antibacterial agent is at least one of the antibacterial agent AMR-5 and the antibacterial agent JP-017.

4. The formula of a washing machine door seal material with plant fragrance according to claim 1, characterized in that: The antioxidant is at least one of 2-mercaptobenzimidazole and 4,4'-bis(α,α-dimethylbenzyl)diphenylamine.

5. The formula of a washing machine door seal material with plant fragrance according to claim 1, characterized in that: The vulcanizing agent is sulfur.

6. The formula of a washing machine door seal material with plant fragrance according to claim 1, characterized in that: The accelerator is at least one of thiazoles, sulfenamides and thiocarbamates.

7. A plant-scented washing machine door seal material formula according to claim 1 or 2, characterized in that: The lubricant is at least one of zinc stearate, paraffin and oleamide.

8. The formula of a washing machine door seal material with plant fragrance according to claim 2, characterized in that: The dispersant is at least one of dispersant 935P and dispersant RL-20.

9. The formula of a washing machine door seal material with plant fragrance according to claim 2, characterized in that: The adsorbent is at least one of calcium silicate and silicon dioxide.

10. The method for preparing a plant-scented washing machine door seal material formula according to claim 1, characterized in that: The following steps are involved: S1. Add EPDM, dispersant, lubricant, plant fragrance powder, adsorbent and silicon dioxide into an internal mixer according to the mass ratio, stir under pressure for 3±1 min, lift the fixed bolt to clean and stir under pressure for 3±1 min again, lift the bolt to turn the material and stir under pressure to 100±5°C, unload to an open mixer, pressurize and cool to obtain plant fragrance A; S2, put EPDM into an internal mixer and stir under pressure for 2±0.5min, then add white carbon black, 1 / 2 clay, antioxidant, lubricant, antibacterial agent, plant fragrance A, masterbatch, and 1 / 2 paraffin oil into the internal mixer according to the mass ratio, stir under pressure for 3±1min, then add the remaining 1 / 2 clay and 1 / 2 paraffin oil into the internal mixer, stir under pressure for 3±1min, stir under pressure for 5±1min after cleaning, open the door and stir under pressure to 150±5℃, unload the material onto the open mixer, press and cool to obtain the semi-finished rubber mix B; S3, putting the cooled semi-finished rubber mix B, accelerator and vulcanizer into an internal mixer according to the mass ratio and stirring under pressure for 2±0.5min, opening the door to turn over the material and stirring under pressure again to 80±5°C, unloading the material to an open mixer, pressing and cooling to obtain a rubber mix C; S4. The prepared mixed rubber C is injected into a mold using an injection vulcanizer, vulcanized and molded at a temperature of 190±5° C., and trimmed to obtain a washing machine door sealing material.

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