| Polyester fabric has many advantages, a wide range of textile application.Polyester fibers and other thermoplastic synthetic material, like the case ofcombustible fibers, heat melting, decomposition, combustion, and having amelt-dripping phenomenon. Therefore, it is very necessary polyester flame retardanttreatment.2-phenoxy (3-hydroxy) phenyl phosphorus oxides (BPHPPO) were prepared. Onthis basis, BPHPPO as a flame retardant intermediate, with isophorone diisocyanate(IPDI) and polyether diols (N210) synthesis flame retardant modified waterbornepolyurethane (FR-PU). The FR-PU was applied to polyester fabric by coatingfinishing.The chemical structures of BPHPPO were characterized by fourier transforminfrared spectrometry (FT–IR), mass spectrometry (MS), nuclear magnetic resonancespectrometer (1H-NMR).The infrared spectrum chart showed–NCO and–OH peaks of FR-PUdisappeared,-NHCO-appeared, indicating that achieve the desired objectives. Theoptimal finishing process of FR–PU was as follows: reacting150min at70℃of theprepolymeri reaction, reacting300min at70℃of the expansion chain,2,2-dimethylolpropionic acid (DMPA) the amount of5.50%, R value of2.10.The flame retardant modified waterborne polyurethane finished for polyesterfabric by coating. Vertical combustion method and limiting oxygen index (LOI)characterized the fabric flame retardant performance. The results showed that: theamount of flame retardant BPHPPO was32.48%; the amount of coating was9.32g/m2;the cured temperature was170℃. After finishing polyester flame retardant meet thestate B1level. Cone calorimeter test results showed that: flame retardant fabricfinishing performance significantly improved; ignition time extended from56s to89s; Average HRR decreased65%; EHC reduced by62%; FPI increased3times; finishedfabrics exhibited excellent flame-retardant effect.To investigate the flame retardant polyester fabric finishing process, thermalstability and char morphology were analyzed by thermogravimetric analyzer (TG) andscanning electron microscopy (SEM). TG showed that, compared with untreatedpolyester fabric, the initial thermal decomposition temperature of polyester fabricflame finishing was advanced, while the500, the char yield increased. Retardantreduced the phase stability at low temperatures, but improved the stability at hightemperature. Char morphology showed: the generation of phosphate promoteddehydration charcoal polyester, delayed the transfer of heat, reduced volatileflammable gases.Kissinger method and Flynn-Wall-Ozawa method were applied to describe thethermal degradation kinetics. The results showed that the activation energy of treatedpolyester fabric was raised. It showed good flame retardant properties. |
PDF Full Text Request