Performance characteristics of Liaoning aluminum alloy door and window adhesive strip
1. Adhesion: due to the lack of active groups in molecular structure, the EPDM strip has low cohesive energy. In addition, the compound is easy to spray frost. Its self adhesion and mutual adhesion are very poor. 2. Aging resistance: EPDM strip has excellent weather resistance, ozone resistance, heat resistance, acid and alkali resistance, water vapor resistance, color stability, electrical performance, oil filling and room temperature fluidity. Liaoning aluminum alloy door and window adhesive strip can be used for a long time at 120 ℃, and can be used temporarily or intermittently at 150-200 ℃. The use temperature can be increased by adding suitable antioxidant. EPDM crosslinked with peroxide can be used under severe conditions. Under the condition of 50 PPHM ozone concentration and 30% stretching, EPDM rubber could not crack for more than 150 hours. 3. Corrosion resistance: due to the lack of polarity and low unsaturation of EPDM sealant strip, it has good resistance to various polar chemicals such as alcohol, acid, alkali, oxidant, refrigerant, detergent, animal and vegetable oil, ketone and grease. 4. Water vapor resistance: EPDM sealant strip has excellent water vapor resistance and is superior to its heat resistance. In the superheated steam at 230 ℃, the appearance does not change after nearly 100 hours, while in the same conditions, fluororubber, silicone rubber, fluorosilicone rubber, butyl rubber and natural rubber experience 5. Resistance to superheated water performance: EPDM rubber strip also has good resistance to superheated water, but it is closely related to all vulcanization systems. After soaking in 125 ℃ superheated water for 15 months, the mechanical properties of EPDM rubber strip have little change, and the volume expansion rate is only 0.3%. 6. Electrical performance: Liaoning aluminum alloy door and window rubber strip has excellent electrical insulation performance and corona resistance, and its electrical performance is better or close to that of SBR, chlorosulfonated polyethylene, polyethylene and cross-linked polyethylene. 7. Elasticity: due to the absence of polar substituents in the molecular structure of EPDM, the molecular cohesion energy is low, and the molecular chain can maintain flexibility in a wide range, next to natural rubber and cis-1,4-polybutadiene rubber, and can still maintain at low temperature.