China Polymer Washers

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    English Name: Polyethylene terephthalate (PET for short)
    Alias: Polyethylene terephthalate; polyethylene terephthalate; Dacron; polyester; polyethylene terephthalate; dacron, etc.
    CAS No.: 25038-59-9
    Density: 1.38g/mlat 25 掳 C
    Melting point: 250-255 掳 C
    Polyethylene terephthalate is the most important type of thermoplastic polyester, commonly known as polyester resin. It is prepared by transesterification of dimethyl terephthalate and glycol or esterification of terephthalic acid and glycol to synthesize dihydroxyethyl terephthalate, and then polycondensation. Together with PBT, it is called thermoplastic polyester or saturated polyester.
    Pet is a milky white or light yellow, highly crystalline polymer with smooth and glossy surface. It has excellent physical and mechanical properties in a wide temperature range, with long-term use temperature up to 120 鈩? excellent electrical insulation. Even at high temperature and high frequency, its electrical performance is still good, but it has poor corona resistance, creep resistance, fatigue resistance, friction resistance and dimensional stability. Pet has ester bond. It will decompose under the action of strong acid, strong alkali and water vapor. It has good resistance to organic solvent and weather. The disadvantages are slow crystallization rate, difficult molding, high molding temperature, long production cycle and poor impact performance. Generally, the processability and physical properties are improved by reinforcement, filling and blending, and the glass fiber reinforcement effect is obvious, and the resin rigidity, heat resistance, drug resistance, electrical performance and weather resistance are improved. However, it is still necessary to improve the disadvantage of slow crystallization speed by adding nucleating agent and crystallization promoter. The flame retardancy and self extinguishing of pet can be improved by adding flame retardant and anti flammability dropping agent.China Polymer Washers

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