What is PET?


Author: mgg-Plastic bottle manufacturer

The polyethylene terephthalate is the most important variety in the thermoplastic polyester, and the English name is Polythylene Terephthalate referred to as PET or PETP (hereinafter, or PET), commonly known as polyester resin. It is a polycondensate of terephthalic acid with ethylene glycol, which is collectively referred to as a thermoplastic polyester together with PBT, or a saturated polyester. In 1946, the United Kingdom published the first patent for preparing PET. In 1949, the British ICI completed the trial, but after the purchase of patents in DuPont, in 1953, the production equipment was first realized in the world.

The initial PET is almost all used for synthetic fibers (my country commonly known as polyester, good). Since the 1980s, PET has made a breakthrough progress as an engineered plastics, and the nuclear agents and crystalline promoters have been developed. At present, PET is a thermoplastic polyester together with PBT, which is one of five major projects. my country's PET production is far behind several major manufacturers of manufacturers.

In the 1980s, my country gradually gradually introduced 10,000 tons to several hundred thousand tons of advanced PET resin synthesis devices, quality and production of quality and production. According to the statistics of China Textile Society, in 1997, my country produced 1.74 million tons of PET slice resins, of which high viscosity packaging (beverage bottles and packaging sheets, etc.) of the slice resin production capacity was 2.24 million tons, so the PET engineering plastic grade resin is produced. Source is sufficient.

Since the apparatus for preparing various mixed modified PET plastics is general purpose, manufacturing, domestic mixed extruder, etc., is also formed, so as long as the market is developed, domestic PET plastics Production will grow rapidly. Characteristics and application of polyethylene terephthalate (PET). Features PET is a milky white or a front yellow highly crystalline polymer, a smooth surface and lustrous. Wheat resistance, fatigue, friction and size stability, high wear and high hardness, have the largest toughness in thermoplastic; electrically insulating performance is good, affected by temperature, but the resistance is poor.

Non-toxic, weather resistance, resistance to chemical drugs, low water absorption, weak acid and organic solvent, but no heat-resistant water soaked, non-alkali. The glass transition temperature of the PET resin is high, the crystallization speed is slow, the molding cycle is long, the molding cycle is long, the molded shrinkage is large, the size is very stable, and the molding of crystallization is brittle, and the heat resistance is low. " Through the nucleating agent and the improvement of the crystalline and glass fiber reinforced, PET has the following characteristics in addition to the properties of the PBT: 1. The thermal deformation temperature and long-term use temperature are the highest in thermoplastic engineering plastics; 2. Because of the heat resistance, the reinforcing PET is impregnated in a solder bath at 250 ° C, which is almost unmatched, and is particularly suitable for electron, electrical parts for preparing tin soldering; 3. The curved strength is 200 MPa, the elastic modulus is 4000 MPa, the creep resistance and fatigue are also very good, the surface hardness is high, the mechanical properties are similar to thermosetting plastics; 4. Since the price of ethylene glycols used in PET is almost inexpensive than the price of butanediol used in PBT, the PET resin and enhancement PET are the lowest price in engineering plastics, which has a high cost performance.

two. application.

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