Research And Development On Hydrophilic And Antistatic Properties Of Bio-based Polyester(PDT) Fibers

With the declining of world crude output and the increasing prominent of environment issues,the development of conventional petroleum-based polyester fibers (PET) are restricted. It’s a trendof chemical fibers’ industry to exploit the new, environmental and alternative bio-based polyesterfibers (PDT). Meanwhile, the moisture regain of polyester fibers is only0.4%and they are easy tocause the antistatic phenomenon and influence the comforbility in the standard environment(measured at20℃and a relative humidity of65%). Besides, they cause many problems of fibers’processing and properties demands. Therefore, it is very important and meaningful to develop thehydrophilic and antistatic bio-based polyester PDT fibers.In this article, a series of hydrophilic and antistatic bio-based polyester were prepared by PTAdirect esterification method with bio-based EG. The third monomer is polyethylene glycol (PEG2000, Mn=2000g/mol), the content of which is5wt%PTA. The nano-ZnO is the fourth monomer,the contents of which is0～0.8wt%PTA. Then the hydrophilic and antistatic bio-based polyesterPDT fibers were prepared by melt spinning. The structure and properties of hydrophilic andantistatic bio-based polyester and fibers were tested. The results were as follows.(1) The properties of raw material were studied by gas chromatography and massspectrometry analysis(GC-MS) and laser particle size analyzer. The results showed that the purityof bio-based glycol was97.78%and the size distribution by number of nano-ZnO was45～100nm.(2) The structure and properties of hydrophilic and antistatic bio-based polyester PDT weretested by nuclear magnetic resonance(1H-NMR), scanning electron microscope(SEM), differentialscanning calorimetry(DSC) and the contact angle. The results showed: The actual additive of PEG2000was4.33%. PEG2000and nano-ZnO made the intrinsic viscosity lower. The dispensabilitywas good when the nano-ZnO was minute quantity. The melt temperature increased and thecrystallization temperature reduced when the nano-ZnO was added. The hydrophilic property of bio-based polyester was improved by the contact angle test when PEG2000and nano-ZnO wereadded. When the additive of PEG2000was5wt%and the additive of nano-ZnO was0.8wt%, thecontact angle reached the lowest which was65.0°.(3) The hydrophilic and antistatic bio-based polyester fibers were prepared by melt spinning.The mechanicall property, orientation degree, crystallinity, hydrophilic property and antistaticproperty were studied. The results showed were as follows. The strength of bio-based polyesterfibers was declined and reached3.5cN/dtex when5wt%PEG2000was added. The right amountof nano-ZnO could improve the strength of fibers. The orientation degree and crystallinitydeclined when PEG2000and nano-ZnO were added. However, the hydrophilic property andantistatic property of fibers were improved. When the additive of PEG2000was5wt%, theadditive of nano-ZnO was0.6wt%, the orientation degree reduced to0.6974, the crystallinityreduced to38.21%. The contact angle and moisture regain reached the best, which were60.8°and0.60%. The volume resistivity of oil-free fibers reached9.16×109Ω·cm. The decay time ofconstant pressure method was only32s. The decay voltage of timing method was only285KV.