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Supply of plastic raw materials (polyethylene terephthalate)
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American DuPont fiberglass reinforcement
Saudi Innovation (USA)
Japan Mitsubishi Engineering
Japan DuPont
Japan Polytechnic,
Sinopec Hainan
PetroChina Liaoyang
China Resources Polyester (Changzhou)
Taiwan Shin Kong
Sichuan Push
Shanghai Yuanfang
Hong Kong Jiande
Shanghai Yuanfang
Netherlands
It is a polymer material, the full name is polyethylene terephthalate. It is widely used, and the bottles of Nongfu Spring are made of it.
It is a polymer flame retardant. Under normal circumstances, polymer materials can burn in the air, and release a large amount of smoke and heat when burning, causing casualties and property losses
Depending on the type and amount of flame retardant added, the polymer The degree of combustion is reduced, usually making it impossible to burn in air, and is generally a higher flame retardant rating.
Characteristics and applications of polyethylene terephthalate
Unisexual
It is a milky white or yellowish highly crystalline polymer with a smooth and shiny surface. Creep resistance, fatigue resistance, good friction resistance and dimensional stability, low wear and high hardness, and the largest toughness among thermoplastics. Good electrical insulation properties, little affected by temperature, but poor corona resistance. Non-toxic weather resistance, good chemical stability, low water absorption, resistance to weak acids and organic solvents, but not resistant to hot water immersion and alkali resistance.
The glass transition temperature of the resin is high, the crystallization speed is slow, the molding cycle is long, the molding shrinkage is large, the dimensional stability is poor, the crystallized molding is brittle, and the heat resistance is low.
Through the improvement of nucleating agent and crystallizing agent and glass fiber reinforcement, in addition to the excellent properties, there are also the following characteristics
The heat distortion temperature and long-term use temperature are the highest among thermoplastic general engineering plastics
/> Because of its high heat resistance, it can be immersed in a solder bath at ℃ with almost no deformation or discoloration. It is especially suitable for preparing soldered electronic and electrical parts
Bending strength, elastic modulus, creep and fatigue resistance It is also very good, with high surface hardness and mechanical properties similar to thermosetting plastics
The price of ethylene glycol used in production is almost half cheaper than the price of butanediol used in production, so resin and reinforcement are the lowest price among engineering plastics and have Very good value for money.
Secondary use
Mainly used for fibers, and a small amount used for films and engineering plastics. The fiber is mainly used in the textile industry. Films are mainly used
, such as capacitor cable insulation, printed circuit wiring substrate, electrode groove insulation, etc. Another application area of films is film bases and base tapes, such as movie films, light sheets, audio tapes, electronic computer tapes, etc. Thin films are also used in vacuum aluminum cladding to make metallized films, such as gold and silver wire micro-capacitor films. Another use is in blow molding products, polyester stretch bottles used for packaging.
Glass fiber reinforcement is suitable for the electronic, electrical and automotive industries, and is used in various coil frames, transformers, television recorder parts and casings, automobile lamp holders, lampshades, incandescent lamp holders, relays, selenium rectifiers, etc. The current consumption proportion of engineering plastics in several application fields is electrical appliances and electronics, automobiles, machinery, appliances, consumer goods, and others. At present, the total consumption of engineering plastics is not large, only accounting for 1% of the total.
Molding processing of polyethylene terephthalate
The molding processing can be injection molding, extrusion, blow molding, coating, bonding, machining, electroplating, vacuum plating, metal printing.
Injection molding can be performed with a screw or plunger injection molding machine. For long fiber reinforcement, since the fibers in the pellets are distributed in bundles and are not mixed well with the resin, they can only be molded with a screw injection molding machine. Resin is very sensitive to notches. Stress concentration is prone to occur at sharp corners during molding, which reduces the ability to withstand load. It is prone to rupture when subjected to force or impact. Therefore, the appearance of the product should be designed to be as smooth and regular as possible, and sharp corners should be avoided as much as possible.