High temperature resistant light color ternary ethylene propylene rubber and preparation method thereof
By preparing high-temperature resistant light-colored EPDM rubber, using a peroxide vulcanization system and silica and talc, the problem of temperature resistance and compression set of rubber materials under high-temperature conditions was solved, achieving a temperature resistance of 180 ℃ and excellent high-temperature compression performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- DONGFENG SHIYAN ZHENGXIANG RUBBER PROD
- Filing Date
- 2026-04-28
- Publication Date
- 2026-06-09
AI Technical Summary
Existing rubber materials have insufficient sealing performance in high-temperature environments, especially in the higher temperatures of automotive engine compartments, and cannot meet high-temperature resistance requirements. At the same time, their high-temperature compression set performance is poor.
A high-temperature resistant, light-colored EPDM rubber was prepared by using a peroxide vulcanization system combined with silica and talc. Through multiple mixing and molding vulcanization processes, the material's temperature resistance and high-temperature compression set properties were improved.
It achieves temperature resistance at 180 ℃ and also has excellent high-temperature compression set performance, meeting the sealing requirements of high-temperature environments such as automobiles.
Smart Images
Figure SMS_4
Abstract
Description
Technical Field
[0001] This invention belongs to the field of rubber technology, specifically relating to a high-temperature resistant light-colored EPDM rubber and its preparation method. Background Technology
[0002] With the development of the automotive and home appliance industries, the standards for rubber materials are becoming increasingly stringent, especially in terms of high-temperature resistance. As automotive power increases, engine compartment temperatures rise, placing even more stringent demands on the high-temperature sealing performance of rubber materials. Summary of the Invention
[0003] In view of this, the present invention provides a high-temperature resistant light-colored EPDM rubber and its preparation method. The light-colored EPDM rubber has a temperature resistance of up to 180 ℃, while also taking into account excellent high-temperature compression set performance.
[0004] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides a high-temperature resistant light-colored EPDM rubber, comprising the following raw materials in parts by weight: 115 parts EPDM rubber, 5-15 parts zinc oxide, 30-40 parts silica, 30-50 parts talc, 10-15 parts paraffin oil, 10-15 parts liquid EPDM, 1-1.5 parts silane coupling agent, 3-5 parts antioxidant, 3-4.5 parts peroxide vulcanizing agent, and 2-3 parts crosslinking aid.
[0005] Preferably, the antioxidant is composed of antioxidant RD and antioxidant ZMMBI.
[0006] Preferably, the antioxidant RD is present in 1 to 2 parts by weight, and the antioxidant ZMMBI is present in 2 to 3 parts by weight.
[0007] Preferably, the peroxide sulfiding agent is di(tert-butylperoxyisopropyl)benzene.
[0008] Preferably, the crosslinking aid is triallyl isocyanurate.
[0009] Preferably, the EPDM rubber is PX-008 EPDM rubber from Mitsui Chemicals, Inc.
[0010] Secondly, the present invention provides a method for preparing the aforementioned high-temperature resistant light-colored EPDM rubber, comprising the following steps: S1. Add EPDM rubber to the internal mixer and mix once. Then add zinc oxide, silane coupling agent, antioxidant, silica, talc, paraffin oil and liquid EPDM and mix twice. Raise the pressure hammer once and then mix three times. After the temperature reaches 120 ℃, discharge the rubber. S2. The rubber compound discharged from the internal mixer is used to produce rubber strips using a two-roll mill. The rubber strips are 8-15 mm thick and 150-250 mm wide, and are stored in a constant temperature warehouse. S3. Add the rested rubber strips to the kneader, add peroxide vulcanizing agent and crosslinking aid, mix and discharge the rubber. S4. Transfer the rubber material discharged from the kneader to the open mill for mixing. Adjust the roller gap to make the rubber sheet thickness 5~10 mm. Pour the rubber twice. Adjust the roller gap to make the rubber sheet thickness 1~2 mm. Pour the rubber through 3 times. Adjust the roller gap to output the rubber sheet with a thickness of 3~5 mm and a width of 200~250 mm. Cool it. S5. After cooling, the rubber sheet undergoes a first-stage compression molding and vulcanization, followed by a second-stage vulcanization, to obtain a high-temperature resistant, light-colored EPDM rubber product.
[0011] Preferably, in step S1, the time for the first mixing is 60 s, the time for the second mixing is 180 s, the time for the third mixing is 90 s, and the pressure of the top plug during the mixing process is 0.5~0.6 MPa.
[0012] Preferably, in step S3, the mixing time is 90 s.
[0013] Preferably, in step S5, the temperature of the first stage of compression molding vulcanization is 180 ℃, the time is 15 min, and the pressure is 15 MPa; the temperature of the second stage of vulcanization is 150 ℃, and the time is 2 h.
[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: The light-colored EPDM rubber provided by this invention adopts a peroxide vulcanization system and is combined with silica and talc. It can withstand temperatures up to 180 ℃ while also exhibiting excellent high-temperature compression set performance. Detailed Implementation
[0015] The present invention will now be described in further detail with reference to specific embodiments, so that those skilled in the art can more clearly understand the present invention.
[0016] Example 1 This embodiment provides a light-colored EPDM rubber, which is composed of the following raw materials in parts by weight: 115 parts of EPDM rubber (Mitsui, Japan, PX-008), 15 parts of zinc oxide, 40 parts of silica, 50 parts of talc, 10 parts of paraffin oil (Idemitsu, Japan, PS-430), 15 parts of liquid EPDM, 1.5 parts of silane coupling agent, 2 parts of antioxidant RD, 2 parts of antioxidant ZMMBI, 3.5 parts of bis(tert-butylperoxyisopropyl)benzene (Perkadox, 14S-FL), and 2 parts of triallyl isocyanurate (TAIC). The preparation method of high-temperature resistant light-colored EPDM rubber includes the following steps: Weighing: Weigh each ingredient according to the above formula; Internal mixer mixing: Add EPDM rubber to the internal mixer and mix for 60 seconds. Add zinc oxide, silane coupling agent, antioxidant RD, antioxidant ZMMBI, silica, talc, paraffin oil, and liquid EPDM. Mix for 180 seconds, raise the pressure hammer once, and mix for another 90 seconds until the temperature reaches 120℃ before discharging the rubber. The pressure of the top plug during the mixing process is 0.5~0.6 MPa. Rubber strip production: After the rubber compound is discharged from the internal mixer, it is produced into rubber strips using an XK550 open mill. The rubber strips are 8~15 mm thick and 150~250 mm wide. The strips are then stored in a constant temperature warehouse for 24 hours. Two-stage vulcanization: After the rubber strips have been left to stand, put them into a kneader, add di(tert-butylperoxyisopropyl)benzene and triallyl isocyanurate, mix for 90 seconds and then discharge the rubber. Mixing on an open mill: The rubber material discharged from the kneader is transferred to the XK550 open mill for mixing. The roller gap is adjusted to make the rubber sheet thickness 5~10 mm. The rubber is poured twice. The roller gap is adjusted to make the rubber sheet thickness 1~2 mm. The rubber is passed through three times. The roller gap is adjusted to produce a rubber sheet with a thickness of 3~5 mm and a width of 200~250 mm. Cooling: Transfer the film to a film cooling machine for cooling, and then store the cooled film in a material box; Vulcanization: The rubber sheet is placed in the mold for vulcanization at a temperature of 180 ℃ for 15 minutes and a pressure of 15 MPa. The vulcanized product is then placed in an oven for secondary vulcanization at a temperature of 150 ℃ for 2 hours to obtain a high-temperature resistant light-colored EPDM rubber product.
[0017] Comparative Example 1 This comparative example provides a light-colored EPDM rubber, composed of the following raw materials in parts by weight: 115 parts EPDM rubber (Mitsui, PX-008, Japan), 5 parts zinc oxide, 60 parts silica, 15 parts paraffin oil (Idemitsu, PS-430, Japan), 5 parts liquid EPDM, 1.5 parts silane coupling agent, 2 parts antioxidant RD, 2 parts antioxidant ZMMBI, 3.5 parts di(tert-butylperoxyisopropyl)benzene (Perkadox, 14S-FL), and 2 parts triallyl isocyanurate (TAIC). The preparation method of light-colored EPDM rubber is the same as that in Example 1.
[0018] Comparative Example 2 This comparative example provides a light-colored EPDM rubber, composed of the following raw materials in parts by weight: 115 parts EPDM rubber (Mitsui, PX-008, Japan), 15 parts zinc oxide, 60 parts silica, 15 parts paraffin oil (Idemitsu, PS-430, Japan), 5 parts liquid EPDM, 1.5 parts silane coupling agent, 2 parts antioxidant RD, 2 parts antioxidant ZMMBI, 3.5 parts di(tert-butylperoxyisopropyl)benzene (Perkadox, 14S-FL), and 2 parts triallyl isocyanurate (TAIC). The preparation method of light-colored EPDM rubber is the same as that in Example 1.
[0019] Comparative Example 3 This comparative example provides a light-colored EPDM rubber, composed of the following raw materials in parts by weight: 115 parts EPDM rubber (Mitsui, PX-008, Japan), 15 parts zinc oxide, 40 parts silica, 50 parts talc, 15 parts paraffin oil (Idemitsu, PS-430, Japan), 5 parts liquid EPDM, 1.5 parts silane coupling agent, 2 parts antioxidant RD, 2 parts antioxidant ZMMBI, 3.5 parts di(tert-butylperoxyisopropyl)benzene (Perkadox, 14S-FL), and 2 parts triallyl isocyanurate (TAIC). The preparation method of light-colored EPDM rubber is the same as that in Example 1.
[0020] Performance Tests and Results The Shore hardness, tensile strength, and elongation at break of the light-colored EPDM rubber products prepared in Example 1 and Comparative Examples 1-3 were measured respectively, and subjected to 180 °C. After 168 hours of air aging, the changes in Shore hardness, tensile strength, and elongation at break of the high-temperature resistant light-colored EPDM rubber product were measured, as well as the results at 160 °C. 72h 25% compression set, results are shown in Table 1.
[0021] Table 1. Performance results of light-colored EPDM rubber products in each embodiment and comparative example.
[0022] As can be seen from Table 1, the light-colored EPDM rubber provided by the present invention can achieve a temperature resistance of up to 180 ℃ while also maintaining excellent high-temperature compression set performance.
[0023] Unless otherwise specified, all raw materials used in this invention are existing substances that can be purchased directly from the market.
[0024] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
Claims
1. A high-temperature resistant, light-colored EPDM rubber, characterized in that, The raw materials include the following parts by weight: 115 parts EPDM rubber, 5-15 parts zinc oxide, 30-40 parts silica, 30-50 parts talc, 10-15 parts paraffin oil, 10-15 parts liquid EPDM, 1-1.5 parts silane coupling agent, 3-5 parts antioxidant, 3-4.5 parts peroxide vulcanizing agent, and 2-3 parts crosslinking aid.
2. The high-temperature resistant light-colored EPDM rubber according to claim 1, characterized in that, The antioxidant is composed of antioxidant RD and antioxidant ZMMBI.
3. The high-temperature resistant light-colored EPDM rubber according to claim 1, characterized in that, The antioxidant RD is present in 1 to 2 parts by weight, and the antioxidant ZMMBI is present in 2 to 3 parts by weight.
4. The high-temperature resistant light-colored EPDM rubber according to claim 1, characterized in that, The peroxide sulfiding agent is di(tert-butylperoxyisopropyl)benzene.
5. The high-temperature resistant light-colored EPDM rubber according to claim 1, characterized in that, The crosslinking aid is triallyl isocyanurate.
6. The high-temperature resistant light-colored EPDM rubber according to claim 1, characterized in that, The EPDM rubber mentioned is the PX-008 model EPDM rubber from Mitsui Chemicals, Inc.
7. The method for preparing high-temperature resistant light-colored EPDM rubber according to any one of claims 1 to 6, characterized in that, Includes the following steps: S1. Add EPDM rubber to the internal mixer and mix once. Then add zinc oxide, silane coupling agent, antioxidant, silica, talc, paraffin oil and liquid EPDM and mix twice. Raise the pressure hammer once and then mix three times. After the temperature reaches 120 ℃, discharge the rubber. S2. The rubber compound discharged from the internal mixer is used to produce rubber strips using an open mill. The rubber strips are 8~15 mm thick and 150~250 mm wide, and are stored in a constant temperature warehouse. S3. Add the rested rubber strips to the kneader, add peroxide vulcanizing agent and crosslinking aid, mix and discharge the rubber. S4. Transfer the rubber material discharged from the kneader to the open mill for mixing. Adjust the roller gap to make the rubber sheet thickness 5~10 mm. Pour the rubber twice. Adjust the roller gap to make the rubber sheet thickness 1~2 mm. Pour the rubber through 3 times. Adjust the roller gap to output the rubber sheet with a thickness of 3~5 mm and a width of 200~250 mm. Cool it. S5. After cooling, the rubber sheet undergoes a first-stage compression molding and vulcanization, followed by a second-stage vulcanization, to obtain a high-temperature resistant, light-colored EPDM rubber product.
8. The method for preparing high-temperature resistant light-colored EPDM rubber according to claim 7, characterized in that, In step S1, the mixing time is 60 s for the first mixing, 180 s for the second mixing, and 90 s for the third mixing. The pressure of the top plug during the mixing process is 0.5~0.6 MPa.
9. The method for preparing high-temperature resistant light-colored EPDM rubber according to claim 7, characterized in that, In step S3, the mixing time is 90 s.
10. The method for preparing high-temperature resistant light-colored EPDM rubber according to claim 7, characterized in that, In step S5, the temperature of the first stage of compression molding vulcanization is 180 ℃, the time is 15 min, and the pressure is 15 MPa. The temperature of the second stage of vulcanization is 150 ℃, and the time is 2 h.