Today, the editor will introduce the characteristics and uses of ethylene propylene diene monomer (EPDM). EPDM is a rubber made by copolymerizing ethylene and propylene with a solution, and then introducing a third monomer (ENB). Epdm rubber is essentially a saturated polymer with excellent aging resistance, weather resistance, electrical insulation, chemical resistance, and impact elasticity. The main disadvantage of ethylene propylene rubber is its slow vulcanization rate. However, other unsaturated rubbers are difficult to use, with very poor self adhesiveness and mutual adhesiveness, resulting in poor processability.

According to the performance characteristics of ethylene propylene rubber, it is mainly used in fields such as aging resistance, water resistance, corrosion resistance, electrical insulation, etc., such as light colored tire sides, heat-resistant conveyor belts, cables, wires, anti-corrosion linings, gaskets, building waterproof sheets, door and window sealing strips, household appliance accessories, plastic modification, etc.

The properties and applications of ethylene propylene rubber.

Ethylene propylene rubber is synthesized mainly from ethylene and propylene, and has excellent aging resistance, electrical insulation performance, and ozone resistance. Ethylene propylene rubber can be filled with a lot of oil and carbon black, with a lower product price. Ethylene propylene rubber has good chemical stability, wear resistance, elasticity, and oil resistance similar to styrene butadiene rubber. Ethylene propylene rubber has a wide range of applications, including tire sides, rubber strips, inner tubes, and automotive parts. It can also be used for wires, cable covers, and high and ultra-high voltage insulation materials. It can also manufacture and make shoes, hygiene products, and other light colored products. The editor of the anti-aging agent manufacturer introduces the performance and improvement:

1. Corrosion resistance

Due to the lack of polarity and low saturation of ethylene propylene rubber, it has good resistance to various polar chemicals such as alcohols, acids, bases, oxidants, refrigerants, cleaning agents, animal and vegetable oils, ketones, and fats. Poor stability in lipids, aromatic solvents (such as gasoline, benzene, etc.), and mineral oils. Under the long-term action of concentrated acid, the performance will also decrease. In ISO/TO7620, nearly 400 corrosive gases and liquid chemicals have data on various rubber properties, and the degree of action is specified for levels 1-4. Corrosive chemicals have a greater impact on the performance of rubber!

2. Adhesion

Due to the lack of active functional groups in its molecular structure, ethylene propylene rubber has low cohesiveness, and the adhesive is prone to frosting, resulting in poor self adhesiveness and mutual adhesiveness.

3. Low density and high filling

The density of ethylene propylene rubber is relatively low, with a density of 0.87. In addition, a large amount of oil can be filled and fillers can be added, which can reduce the cost of rubber products and compensate for the high price and sebum value of ethylene propylene rubber. The reduction in physical and mechanical energy after high filling is not significant.

4. Elasticity

Due to the non-polar substituents in the molecular structure of ethylene propylene rubber, the molecular cohesion is low, and the molecular chains can maintain a wide range of flexibility, second only to natural rubber and butadiene rubber, and can be maintained at low temperatures. 5. Hot water resistance

Ethylene propylene rubber also has good resistance to overheating, but is closely related to all vulcanization systems. After soaking in superheated water at 125 ℃ for 15 months, the mechanical properties of ethylene propylene rubber vulcanized with disulfide protein and TMTD changed very little, with a volume expansion rate of only 0.3%. 6. Electrical performance

Ethylene propylene rubber has excellent electrical insulation performance and corona resistance, and its electrical performance is superior to or close to that of styrene butadiene rubber, chlorosulfonated polyethylene, polyethylene, and cross-linked polyethylene. 7. Water vapor resistance

Ethylene propylene rubber has excellent steam resistance and is estimated to be superior to its heat resistance. After nearly 100 hours in superheated steam at 230 ℃, there was no change in appearance. Fluorosilicone rubber, fluorosilicone rubber, butyl rubber, nitrile rubber, and natural rubber will exhibit significant appearance deterioration in a short period of time under the same conditions.

8. Aging resistance

Ethylene propylene rubber has excellent weather resistance, ozone resistance, heat resistance, acid and alkali resistance, water vapor resistance, color stability, electrical properties, oil and room temperature flowability. Ethylene propylene rubber products can be used temporarily or intermittently at 120 ℃ and 150 ℃ to 200 ℃.