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1, 3-propanediol (PDO) is widely used and is mainly used to produce PTT polyester.PDO is a good solvent, antifreeze agent, protective agent, mainly used in the synthesis of plasticizer, detergent, preservative, emulsifier, also used in food, cosmetics and pharmaceutical industries, the most important use is as a monomer and terephthalic acid synthesis of new polyester materials - polyterephthalate (PTT).In addition, 1, 3-propanediol can be used to prepare other saturated polyesters, such as polynaphthalene propylene glycol diformate (PTN) and copolymerized polyesters.It is used to prepare new polyurethane including foaming products, adhesives, coatings and fine chemical products (including antifreeze, powder coating, solvent, road snow melting agent, medicine, etc.).With the continuous improvement of the industrialization technology of biobase 1, 3-propanediol and the expansion of its application field, its development prospect will be very broad.1, 3-propanediol is an important monomer raw material of PTT polyester, and its industrialization process promotes the development of PTT polyester market.The high production cost and difficult industrial production of 1, 3-propanediol limited the industrial production of PTT. Polyterephthalate (PTT) is an important industrial polyester, which is formed by condensation of 1, 3-propanediol (PDO) and terephthalic acid (PTA) or dimethyl terephthalate (DMT).It is a semi - aromatic, semi - crystalline thermoplastic that can be easily molded, thermoformed and spun into fibers.Its mechanical and thermophysical properties are similar to those of polyethylene terephthalate (PET), and its molding properties are comparable to that of polybutylene terephthalate (PBT).For example, it has good tensile and bending strength, good dimensional stability, and good fluidity and surface finish.Like polyethylene terephthalate, it has good chemical resistance, including gasoline, carbon tetrachloride, oil, fat, alcohols, alcohols, dilute acids, and bases.
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