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EPDM is the abbreviation of ethylene propylene diene monomer, which is mainly copolymerized by ethylene, propylene and non-conjugated dienes. Ethylene gives rubber excellent chemical stability and aging resistance; propylene enhances the elasticity and flexibility of rubber; and non-conjugated dienes provide vulcanization active points for rubber, allowing rubber to form a three-dimensional network structure through vulcanization reaction, thus having better physical properties.
When making EPDM rubber strips, the first step is mixing. Mix EPDM raw rubber and various compounding agents such as vulcanizers, accelerators, fillers, plasticizers, etc. in a rubber mixer according to a certain proportion, so that the compounding agents are evenly dispersed in the raw rubber to form a mixed rubber. This step has a great impact on the performance of the rubber strip. Different compounding agent formulas will change the hardness, tensile strength, weather resistance, etc. of the rubber strip. Next is extrusion molding, where the mixed rubber is extruded through an extruder and passed through a specific die to form a rubber strip blank with a certain shape and size. During the extrusion process, the temperature, pressure and extrusion speed must be strictly controlled to ensure the dimensional accuracy and surface quality of the rubber strip. Finally, vulcanization is performed, where the extruded rubber strip blank is placed in a vulcanization device and subjected to a vulcanization reaction at a certain temperature and pressure. Vulcanization allows cross-linking between rubber molecules, improving the strength, elasticity, wear resistance and other properties of the rubber. The temperature and time of vulcanization also need to be precisely controlled according to the formula and product requirements.
From the perspective of performance principle, the sealing performance of EPDM rubber strips comes from its good elasticity and flexibility. When squeezed by external force, it will deform and then fill the gap to achieve sealing. Its sealing effect is mainly related to the hardness of the rubber strip, compression permanent deformation and other performance indicators. Rubber strips with moderate hardness have good sealing effects and are not easily deformed after long-term use. Its weather resistance is also excellent. Because there is no double bond in the molecular structure of EPDM rubber, it is resistant to ultraviolet rays, ozone, and chemical corrosion. It can resist erosion from sunlight, rain, wind and sand for a long time outdoors, with stable performance and long service life. And its temperature resistance is also good. It can generally work normally in the temperature range of -50℃ to 150℃. This is because the chemical bond energy in its molecular structure is high, it is not easy to break at high temperature, and it is not easy to harden at low temperature, which ensures stable performance under different temperature conditions.
The application areas of EPDM rubber strips cover many aspects. In the construction industry, it is used for sealing building doors and windows, effectively blocking rain, dust, and noise, and improving the thermal insulation performance of buildings. It is also used for sealing and waterproofing of curtain walls, expansion joints and other parts; in the automotive industry, it is widely used for sealing car doors, windows, trunks and other parts to prevent rain and dust from entering the car, and it can also reduce shock and sound, and improve driving comfort; the electronic and electrical industry uses it to waterproof and dustproof electronic equipment, protect internal circuit components, and improve equipment reliability and stability.
