EPDM resistance to ethylene glycol corrosion

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EPDM products are designed for users who require highly secure flooring. EPDM particles are made of synthetic rubber; they are available in a variety of colors and are renowned for their excellent resistance to ultraviolet radiation as well as to common chemical reactions. Especially during patterned construction, the superiority of EPDM colored particles becomes even more evident. Chemical stability: EPDM products exhibit high corrosion resistance and excellent chemical stability, as well as resistance to ozone aging and heat-oxygen aging. Good elasticity: It maintains excellent elasticity even at low temperatures. Strong adhesion: During the production process, technicians, through numerous tests and field trials, have resolved the most challenging issue related to the adhesion between the particles and the binder. EPDM is a copolymer of ethylene, propylene, and a small amount of non-conjugated dienes; it is a type of ethylene-propylene rubber denoted as EPDM (Ethylene Propylene Diene Monomer). Since its main chain consists of chemically stable saturated hydrocarbons with only unsaturated double bonds in the side chains, it exhibits excellent aging resistance properties such as ozone resistance, heat resistance, and weather resistance. It can be widely used in applications such as automotive components, waterproofing materials for construction, insulation for wires and cables, heat-resistant hoses, tapes, and automotive seals.

Introduction to EPDM Rubber EPDM rubber is a terpolymer of ethylene, propylene, and a non-conjugated diene, and its commercial production began in 1963. The global consumption volume each year is 800,000 tons. The most prominent characteristic of EPDM is its excellent resistance to oxidation, ozone, and corrosion. Since EPDM belongs to the polyolefin family, it possesses excellent vulcanization properties. Of all rubbers, EPDM has the lowest specific gravity. It can absorb large amounts of filler and oil with little effect on its properties. Therefore, rubber compounds with low production costs can be manufactured. 　　Molecular Structure and Properties EPDM is a terpolymer of ethylene, propylene, and a non-conjugated diene. Dienes have a special structure, allowing only one of their double bonds to participate in copolymerization, with the unsaturated double bond serving primarily as a cross-linking site. The other unsaturated group will not become part of the polymer’s main chain; it will only serve as a side chain. The main polymer chains of EPDM are completely saturated. It can resist heat, light, oxygen, and especially ozone. EPDM is essentially non-polar, resistant to polar solutions and chemicals, has a low water absorption rate, and exhibits excellent insulating properties. 　　During the production of EPDM, its properties can be adjusted by changing the amounts of the three monomers, the ethylene-to-propylene ratio, the molecular weight and its distribution, as well as the vulcanization method. 　　Selection of the third monomer for EPDM The third type of diene monomer is obtained through the copolymerization of ethylene and propylene, thereby introducing unsaturation into the polymer to enable vulcanization. The choice of the third monomer must meet the following requirements: at most two bonds, one of which is polymerizable and the other vulcanizable; the reaction should be similar to that of two basic monomers; random polymerization of the key bonds results in a uniform distribution; sufficient volatility to facilitate removal from the polymer; and an appropriate vulcanization rate for the final polymer. Currently, there are only three types of monomers used in industrial production of EPDM: ethylene-vinylnylbenzene (ENB), dicyclopentadiene (DCPD), and 1,4-hexadiene (HD), namely CH3-CH=CH-CH2-CH=CH2 (this monomer is currently used only by Du Pont in the United States). The type and content of dienes affect the properties of the polymer. In EPDM production, ENB and DCPD are the main monomers used. 　　The most widely used type in EPDM is ENB, which vulcanizes much faster than DCPD products. Under the same polymerization conditions, the nature of the third monomer influences long-chain branching, in the following order of increasing effect: EPM