What is the main raw material for the production of acupuncture carpets, geotextile, paper blankets, Xupian, warm air filtration materials? Why?
Polyester is the basic component of polyethylene terephthalate two ester, it is also known as polyester fiber (PET), the long chain molecules of the chemical formula for H (OCH2CCOCO) NOCH2CH2OH, the relative molecular weight is generally around 18000~25000. In fact, there are a few monomers and oligomers in it. These oligomers are low in degree of polymerization and exist in a cyclic form. Poly (ethylene terephthalate) two can be obtained by condensation of terephthalic acid (PTA) and ethylene glycol (EG) by direct esterification with polyethylene terephthalate two 9BHET.
From the molecular composition of polyester, it is composed of short aliphatic hydrocarbon chains, ester groups, benzene rings and hydroxyl groups. Besides the presence of two alcohol hydroxyl groups, there are no other polar groups in polyester molecules, so the hydrophilicity of polyester fiber is very poor. The polyester molecule contains about 46% ester, ester hydrolysis can occur at high temperature, thermal cracking, alkali, soap solution, the degree of polymerization decreased; polyester molecule also contains aliphatic hydrocarbon chains, it can make the polyester molecule has some flexibility, but also because the polyester molecular cannot rotate within benzene rings. The polyester macromolecular substantially rigid molecular chain, easy to keep line. Therefore, polyester macromolecule is easy to form crystallization under this condition, so the crystallinity and orientation of polyester fiber are higher.
