Thermoplastic polyesters or simply polyesters are broadly referred to as macromolecular structures containing ester-based polymers. The polyester family currently has PBT, PET, PCT, PEN and other members, and PTT is another star of the polyester family. PTT is an abbreviation of poly(paraphenylene terephthalate). PTT differs from PET in the molecular structure by only one carbon atom, but there is a big difference in the crystal structure, and the lattice packing density is looser than that of PET. PTT attracts attention with its unique characteristics, production and development advantages. Especially in fiber applications, combining the excellent performance of various chemical fibers with its own inherent elasticity, it has become one of the hottest new polymer materials currently being developed in the world and is unique in PET.
Since the PTT industrialization of Shell Chemical Company in the mid-1990s, international chemical fiber and chemical manufacturers have generated great interest in their superior industrial production conditions and excellent overall performance. It not only explored the application of PTT in the field of synthetic fibers, but also studied the application of engineering plastics and films.
The basic performance of PTT: 1 has a higher tensile and recovery. Due to the characteristics of PTT macromolecular conformation and polymer lattice structure, its elastic recovery is superior to that of PBT and PET. 2 has a lower modulus. According to the data, the Young's moduli of PET, PPT, and PA are: 10.3, 9.7, and 9.65, respectively. The PTT's soft touch and a certain degree of elasticity. The 3PTT has a low melting point and glass transition temperature and is easy to crystallize. Its heat setting temperature is much lower than that of PET. 4PTT has excellent dimensional stability, weather resistance and transparency.
One of the raw materials for the production of PTT, tripropylene glycol (PDO) has been synthesized through bio-engineering technology, providing a non-oil feedstock route for PTT production, and development of new production processes and other important means. The process for synthesizing PTT has two routes: direct esterification and transesterification. At present, the direct esterification method is widely used in foreign countries. Its characteristics are short production process, low investment, and no use of methanol. It can simplify the recovery process and equipment, and has high production efficiency and less environmental pollution.
In addition to PTT applications, chemical fiber, PTT resin applications in engineering plastics, films and containers are also very broad, attractive prospects. PTT filled with glass fiber is not inferior to nylon 66 in strength and impact resistance, and its moisture absorption is low. It is expected that in the near future, PTT will become a strong competitor for PET and nylon 66 in the engineering plastics field. PTT film has good transparency, heat resistance, processability, therefore, it is also an ideal packaging material.
Source of information: pack.cn
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