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epdm weatherstrip, rubber strip seal,pvc extrusion strip,automobile rubber seal strip,Fire proof sealing strip

epdm weatherstrip, rubber strip seal,pvc extrusion strip,automobile rubber seal strip,Fire proof sealing strip

epdm weatherstrip, rubber strip seal,pvc extrusion strip,automobile rubber seal strip,Fire proof sealing strip,door and window rubber strip seal

 

Three EPDM (EPDM) has been widely used in automotive sealing and high-end doors and windows industry, this paper let everybody know three rubber sealing strips (EPDM). Three rubber sealing strips ozone resistance, heat resistance, weather resistance, low temperature flexibility is good, can be used for ozone resistance, weather resistance, ultraviolet radiation resistant occasions, but its structural characteristics based on the flame resistance, oil resistance and low bond strength. This is the main chain structure of saturated rubber can be blended, can complement each other's performance. Three EPDM backbone from saturated hydrocarbon chemical stable composition, only in the side chain containing unsaturated double bonds, it basically belongs to the kind of saturated rubber. The molecular structure in polar substituents, the intermolecular cohesive energy is low, so the chain can maintain flexibility in a wide range of temperature. The chemical structure of ethylene propylene rubber vulcanize products with unique properties. A low density, high filling: three Yuan rubber is a kind of low density rubber, its density is 0. 87. Coupled with the large oil filled and filled, thereby reducing the cost of rubber products, make up three of EPDM rubber prices high, and three of EPDM Mooney value, high filling after the physical and mechanical properties decreased slightly. Two, aging resistance: EPDM has excellent weather resistance, ozone resistance, heat resistance, acid and alkali resistance, water vapor resistance, color stability, electrical properties, filling oil and liquidity at room temperature. Three EPDM rubber products can be used for a long time under 120 degrees, at 150 to 200 DEG C under transient or intermittent use. Adding suitable antioxidant can improve the use of temperature. With three EPDM peroxide crosslinking can be used in harsh conditions. Three EPDM in ozone concentration of 50 * 10 ~ 30%, stretching, not cracked up to 150 hours or more. Three, the corrosion resistance of EPDM rubber: due to lack of polar, low unsaturation, and various polar chemicals such as alcohol, acid, alkali, oxidant, refrigerants, detergents, animal and vegetable oils, ketone and fat were high resistance; but in the genus and genus of aromatic lipid solvent (such as poor stability of gasoline benzene, and mineral oil. Under the long-term effect of concentrated acid. In the ISO / TR7620 data in a collection of nearly 400 kinds of corrosive gas and liquid chemicals on various properties of rubber effect. There are more than 80 kinds of chemicals with Liu Yibing's function of grade 1. Four, water vapor: EPDM has excellent water vapor resistance and superior heat resistance. In superheated steam at 230 DEG C, no change in appearance after 100h. The fluorine rubber, silicone rubber, silicone rubber, butyl rubber, nitrile rubber, natural rubber under the same conditions, through a short time have obvious deterioration of appearance. Five, hot water resistance performance: three EPDM water resistant performance is good, but is closely related with the vulcanization system. Two to two TMTD thio morpholine, ethylene propylene rubber vulcanization system, 125 degrees in the superheated water immersion after 15 months, the change of mechanical properties is very small, the volume expansion rate of only 0. 3%. Six, electrical properties: three EPDM has excellent electrical insulation properties and corona resistance, electrical properties better than styrene butadiene rubber, chlorosulfonated polyethylene, polyethylene and crosslinked polyethylene. Seven, flexible: no polar substituents of three membered ethylene propylene rubber structure, molecular cohesive low molecular chain can maintain flexibility in a wide range, only to natural rubber and butadiene rubber, and can still maintain at low temperature. Eight, cohesiveness: three Yuan rubber due to the lack of active groups in the molecular structure, the cohesive energy is low, and the adhesive material is easy to spray frost, self adhesive and mutually adhesive is poor. Automotive rubber seal, a sealing strip including overview windows & doors, ceiling, decorative, mosaic, flocking, coating and other varieties. Polyolefin, thermoplastic elastomer. Such as three Yuan rubber and rubber and thermoplastic elastomer TPE. The utility model has the advantages of good abrasion resistance, good weather resistance, small friction coefficient and relatively simple manufacturing process. Some with the framework of the sealing strip, a wide variety, such as steel, wire braid, aluminum strip. The strip also includes tensile steel, cutting strip, plate belt. The tensile steel strip is divided into symmetrical tensile steel belt and asymmetric tensile steel. The punching strip is divided into single bridge and double bridge steel punching punching steel. Two, automotive rubber seal type, structure and material of main body, 1 seal type: Seal of various types, there are several commonly used, such as: door seal, glass guide groove sealing strip and the outside of the door sealing strip, sealing strip, engine radiator cover seal, trunk cover seal, seal, drainage channel interior decoration seal. 2, seal structure: A, pure rubber sealing strip (including sponge foam seal), B composite rubber seal (including foam sponge and compacting plastic composite; c), plastic and metal composite seal; D, flocking or installation of surface treatment seal; E, rubber and sponge, foam metal repeat seal. 3, seal body material: A, with long branched three EPDM; B, thermoplastic three EPDM elastomer; C, low friction material (plastic material with thermoplastic EPDM to three co extrusion composite in the seal surface with low friction heat). Three, car seal performance requirements 1, conventional performance: such as hardness, tensile strength and tensile elongation and compression permanent deformation resistance, ageing resistance, ozone aging, resistance paint contact infiltration performance. 2, product performance: including extrusion pressure, frame closing before and after insertion and pullout, flocking surface wear resistance, the wear resistance of the seal coating.