Today, let’s take a look at the characteristics and uses of ethylene propylene diene (EPDM). Epdm rubber is made of ethylene and propylene copolymerized with solution, and then a third monomer (ENB) is introduced. Epdm rubber is basically a saturated polymer with good aging resistance, weather resistance, electrical insulation, chemical resistance and impact elasticity. The main disadvantage of ethylene propylene rubber is its slow vulcanization. And other unsaturated rubber is difficult to use, self-viscosity and mutual viscosity is very poor, so the processing performance is not good.

According to the performance characteristics of ethylene propylene rubber, it is mainly used in aging resistance, water resistance, corrosion resistance, electrical insulation and other fields, such as light-colored tire side, heat-resistant conveyor belt, cable, wire, anti-corrosion lining, gasket, building waterproof sheet, door and window sealing strip, household electrical accessories, plastic modification.

Properties and uses of ethylene propylene rubber.

Ethylene propylene rubber is synthesized from ethylene and propylene as the main raw materials. It has excellent aging resistance, electrical insulation property and ozone resistance. Ethylene propylene rubber can be filled with a lot of oil and carbon black, the product price is low, ethylene propylene rubber has good chemical stability, wear resistance, elasticity, oil resistance and styrene butadiene rubber close. Ethylene propylene rubber is very versatile, can be used as tire sides, rubber strips, inner tubes and automotive parts, can also be used as wires, cable covers and high voltage, ultra high voltage insulation. It can also make and manufacture shoes, sanitary products and other light-colored products. The small edition of antioxidant manufacturer introduces the performance and improvement:

1. Corrosion resistance

Due to the lack of polarity and low saturation, ethylene propylene rubber has good resistance to a variety of polar chemicals (such as alcohols, acids, bases, oxidants, refrigerants, cleaners, animal and vegetable oils, ketones and fats, etc.). Poor stability in lipid and aromatic solvents (e.g., gasoline, benzene, etc.) and mineral oils. Under the long-term action of concentrated acid, the performance will also decline. In ISO/TO7620, nearly 400 kinds of corrosive gases and liquid chemicals on a variety of rubber performance data, and provides for the 1-4 degree of action, corrosive chemicals have a greater impact on the performance of rubber!

2. Adhesion

Due to the lack of molecular structure of active groups, ethylene propylene rubber has low cohesiveness, and the adhesive is easy to spray frost, so the self-viscosity and mutual viscosity are very poor.

3. Low density and high filling

The density of ethylene propylene rubber is a lower type of rubber, the density is 0.87. In addition, can fill a lot of oil, can add filler, so as to reduce the cost of rubber products, make up for the high price of ethylene propylene rubber, high sebum value shortcomings, high filling after the reduction of physical and mechanical energy is not large.

Step 4 Be flexible

Due to the non-polar substituents in the molecular structure of ethylene propylene rubber, the molecular cohesion is low, the molecular chain can maintain a wide range of flexibility, second only to natural rubber and butadiene rubber, and can be maintained at a low level of temperature. 5. Heat resistant water

Ethylene propylene rubber also has good resistance to superheating, 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 by disulfide and TMTD changed little, and the volume expansion rate was only 0.3%. 6. Electrical performance

Ethylene propylene rubber has excellent electrical insulation properties and corona resistance, its electrical properties are better than or close to styrene butadiene rubber, chlorosulfonated polyethylene, polyethylene and crosslinked polyethylene. 7. Resistance to water vapor

Ethylene propylene rubber has excellent steam resistance and is estimated to be better than its heat resistance. In the superheated steam of 230℃, there is no change in appearance after nearly 100 hours. Fluoro-silicone rubber, fluoro-silicone rubber, butyl rubber, nitrile rubber, natural rubber under the same conditions, there will be obvious appearance deterioration in a short time.

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 fluidity. Ethylene-propylene rubber products can be used at 120℃, 150-200 ℃ temporary or intermittent.