Epdm
EPDM Chinese name: EPDM rubber
English full name: Ethylene-Propylene-Diene Monomer (abbreviation: EPDM)
Introduction of EPDM rubber
EPDM rubber is a terpolymer of ethylene, propylene and non-conjugated diene, which was commercialized in 1963. The annual consumption worldwide is 800,000 tons. The main characteristic of EPDMzui is its superior resistance to oxidation, ozone and erosion. Since EPDM is a polyolefin family, it has excellent vulcanization characteristics. Among all the rubbers, it has a low specific gravity. It absorbs a large amount of fillers and oils and has little effect on properties. Therefore, it is possible to produce a rubber compound which is inexpensive.
Molecular Structure and Properties EPDM is a terpolymer of ethylene, propylene and a non-conjugated diene. Diolefins have a special structure, only one of the two bonds can be copolymerized, and the unsaturated double bonds are mainly used as a crosslink. The other unsaturated will not become the polymer backbone, it will only become the side chain. The main polymer chain of EPDM is fully saturated. This property makes EPDM resistant to heat, light, oxygen, and especially ozone. EPDM is essentially non-polar, resistant to polar solutions and chemicals, low in water absorption, and has good insulating properties. In the production process of EPDM, the characteristics can be adjusted by changing the amount of the three monomers, the ethylene-propylene ratio, the molecular weight and its distribution, and the method of vulcanization.
Selection of Third Monomer The monomer of the third diene type is produced by copolymerization of ethylene and propylene to produce an unsaturation in the polymer in order to effect vulcanization. The choice of the third monomer must meet the following requirements: zui more than two bonds: one polymerizable, one vulcanization reaction similar to the two basic monomer primary bonds random polymerization to produce a uniform distribution of sufficient volatility, easy to remove the Zui from the polymer The final polymer vulcanization rate is suitable. Currently, the third monomer for industrial production of EPDM rubber has only the following three types: ethylidene norbornene (ENB) dicyclopentadiene (DCPD) 1,4-hexadiene (HD) CH3 -CH=CH-CH2-CH=CH2 (This monomer is currently only used by Du Pont in the United States.) Effect of diene type and content on polymer properties ENB and DCPD are mainly used in the production of EPDM.
The widely used EPZ in EPDM is ENB, which is much faster than DCPD products. Under the same polymerization conditions, the nature of the third monomer affects long chain branching, increasing in the following order: EPM
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