Oil-proof ethylene propylene diene monomer material and preparation method thereof

An EPDM and oil-resistant technology, which is applied in the field of oil-resistant EPDM materials and their preparation, can solve the problems of large changes in tensile strength and volume, reduced water pump sealing effect, and inability to adapt well. Avoid the risk of whitening, improve shrinkage permanent deformation performance, and excellent compression set performance

Inactive Publication Date: 2017-09-08
南京金三力高分子科技有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] The Chinese patent with publication number CN104387679A discloses a high oil resistance EPDM rubber composition, including 100 parts of EPDM raw rubber, 3-5 parts of zinc oxide, 1-3 parts of polyethylene glycol, 1-3 parts of 3 parts of coumarone, 1-3 parts of stearic acid, 0.5-2.0 parts of antioxidant RD, 10-50 parts of carbon black N550, 100-150 parts of clay, 10-50 parts of silicon oxide, 1-5 parts of silane coupling agent, 0.5-1.5 parts of accelerator M, 1.5-2.5 parts of accelerator CZ, 0.5-1.5 parts of accelerator TMTD, 0.8-2.0 parts of accelerator DTDM and 0.5-1.5 parts of vulcanizing agent, although the EPDM rubber composition It maintains certain mechanical properties, resilience and dimensional stability under the condition of contact with engine oil, but with the prolongation of service time, the hardness, elongation, tensile strength and volume change greatly, resulting in a decline in oil resistance and a decrease in the sealing effect of the water pump.
[0004] The Chinese patent with the publication number CN106117823A discloses a high-temperature, oil-resistant and low-odor EPDM composition, which is made of the following raw material components in parts by mass: EPDM rubber 100, polyethylene glycol 2- 4. Antiaging agent 1~3, quick extruded carbon black 60~100, spray carbon black 30~50, silica 30~60, deodorant 0.5~2, paraffin oil 33~60, sulfur 0~1, crosslinking Agents 2 to 8, auxiliary crosslinking agents 3 to 7, the EPDM composition of the invention reduces the vulcanization temperature during the preparation process to achieve the purpose of saving energy and financial resources, reducing pollution, and simplifying the production process, but the three The ethylene-propylene-diene rubber composition is not well adapted to the 125°C and oil-resistant environment, and the service life needs to be improved urgently

Method used

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  • Oil-proof ethylene propylene diene monomer material and preparation method thereof
  • Oil-proof ethylene propylene diene monomer material and preparation method thereof
  • Oil-proof ethylene propylene diene monomer material and preparation method thereof

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preparation example Construction

[0033] The preparation method of oil-resistant EPDM material of the present invention comprises the following steps:

[0034] (1) Mixing of EPDM masterbatch: put EPDM rubber, zinc oxide, and stearic acid in a banbury mixer for 30-50 seconds, then add carbon black N550 and carbon black N774, and banbury After 90-120 seconds, the mixing temperature reaches 110-125°C for debinding, and the master batch is parked for more than 12 hours;

[0035] (2) Mixing of nitrile rubber masterbatch: put the nitrile rubber in the internal mixer for 30-50 seconds, then add anti-aging agent 445 and anti-aging agent ZMMBI, after banburying for 20-30 seconds, add carbon black N990, kaolin, and plasticizer NEO-T, after banburying for 90-120 seconds, the mixing temperature reaches 120-135°C for debinding, and the masterbatch is parked for more than 12 hours;

[0036] (3) Vulcanization of masterbatch: Put the parked EPDM masterbatch and nitrile rubber masterbatch in the internal mixer for 30-50 secon...

Embodiment 1

[0040] The oil-resistant EPDM material of this example, the proportioning of this material according to parts by weight is as follows:

[0041]

[0042] The preparation method of oil-resistant EPDM material of the present invention comprises the following steps:

[0043] (1) Mixing of EPDM masterbatch: put EPDM rubber, zinc oxide, and stearic acid in a banbury mixer for 30 seconds, then add carbon black N550 and carbon black N774, and banbury for 90 seconds Finally, the mixing temperature reaches 110°C for debinding (temperature priority), and the masterbatch is parked for more than 12 hours;

[0044] (2) Mixing of nitrile rubber masterbatch: put the nitrile rubber in the mixer for 30 seconds, then add anti-aging agent 445, anti-aging agent ZMMBI, after banburying for 20 seconds, add carbon black N990, kaolin, For plasticizer NEO-T, after banburying for 90 seconds, the mixing temperature reaches 120°C for debinding (temperature priority), and the master batch is parked for...

Embodiment 2

[0048] The oil-resistant EPDM material of this example, the proportioning of this material according to parts by weight is as follows:

[0049]

[0050] The preparation method of oil-resistant EPDM material of the present invention comprises the following steps:

[0051] (1) Mixing of EPDM masterbatch: put EPDM rubber, zinc oxide, and stearic acid in a banbury mixer for 40 seconds, then add carbon black N550 and carbon black N774, and banbury for 105 seconds Finally, the mixing temperature reaches 127°C for debinding (temperature priority), and the masterbatch is parked for more than 12 hours;

[0052] (2) Mixing of nitrile rubber masterbatch: put the nitrile rubber in the mixer for 40 seconds, then add anti-aging agent 445, anti-aging agent ZMMBI, after banburying for 25 seconds, add carbon black N990, kaolin, For plasticizer NEO-T, after banburying for 105 seconds, the mixing temperature reaches 127°C for debinding (temperature priority), and the masterbatch is parked fo...

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Abstract

The invention discloses an oil-proof ethylene propylene diene monomer material and a preparation method thereof and belongs to the technical field of rubber preparation. The material is prepared from the following components in parts by weight: 100 parts of ethylene propylene diene monomer, 65 parts of nitrile butadiene rubber, 10 parts of zinc oxide, 1 part of stearic acid, 25 parts of carbon black N550, 40 parts of carbon black N774, 40-50 parts of carbon black N990, 35 parts of kaolin, 20-25 parts of plasticizer NEO-T, 1.5 parts of anti-aging agent 445, 1.5 parts of anti-aging agent ZMMBI, 2-2.5 parts of vulcanizing agent liquid 2,5-Dimethyl-2,5-di(tert-butylperoxy)hexane, 1.3-1.7 parts of odorless DCP and 3-4 parts of synergistic agent. According to the oil-proof ethylene propylene diene monomer material disclosed by the invention, after the material is soaked for 70 hours in 5W30 engine oil at 150 DEG C, the hardness change is -2 Shore A, the elongation change is 0-(-15%), the tensile strength change is 0-(-17%), the volume change is less than or equal to 25%, and the high temperature resistance, oil-proof property and compression set property are excellent.

Description

technical field [0001] The invention belongs to the technical field of rubber preparation, and in particular relates to an oil-resistant EPDM material and a preparation method thereof. Background technique [0002] EPDM rubber has excellent heat resistance and aging resistance. Peroxide-cured EPDM rubber can be used for a long time at 125°C; it has good resistance to polar solutions and low water absorption. Therefore, EPDM rubber Commonly used in the production of automotive engine water pump seals. However, the engine water pump may come into contact with engine oil during engine repair and maintenance. Since EPDM rubber is not oil-resistant, after contact with engine oil, the sealing ring product will swell, the mechanical properties of the rubber molecules will decrease, and the density of the rubber will decrease. The sealing performance of the ring is reduced, and the seal is prone to failure. Therefore, it is necessary to improve the oil resistance of EPDM rubber us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/16C08L9/02C08K13/02C08K3/22C08K5/09C08K3/04C08K5/14C08K3/34C08K5/3492C08K3/36C08K5/12
CPCC08L23/16C08K2003/2296C08K2201/014C08L2201/08C08L9/02C08K13/02C08K3/22C08K5/09C08K3/04C08K5/14C08K3/346C08K5/34924C08K3/36C08K5/12
Inventor 芮巧红程万福杜爱丽
Owner 南京金三力高分子科技有限公司
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