Polymerization of BHET recovered from waste polyester textiles and spinning performance of regenerated chips
In order to realize the recycling industrialization of waste polyester textiles,hundred gram-scale regenerated polyeth-ylene terephthalate(PET)chips were prepared on the basis of previous small-scale experiments from kilogram-scale waste poly-ester textiles by ethylene glycol(EG)steam decolorization,EG alcoholysis and purification and polycondensation of recycled bis-hydroxyethyl terephthalate(BHET).And the melt spinning of regenerated PET chips was experimentally performed.The purity and chromaticity of recycled BHET,the structure and properties of regenerated PET chips,and the properties of regenerated PET primary fibers were studied.The results showed that the recycled BHET was of a purity of 98.69%,a chromaticity L value of 99.46 and the quality better than that of commercially available petroleum based BHET;the regenerated PET prepared by recy-cled BHET polymerization had the intrinsic viscosity of 0.681 dL/g,the carboxyl end group content of 15 mol/t,the chromaticity L value of 89.59,a value of-1.82 and b value of 2.99,and all indicators met the national standard requirements for fiber-grade chips;the regenerated PET primary fibers exhibited the breaking strength,breaking modulus and elongation at break of 0.78 cN/dtex,0.42 cN/dtex and 182.98%,respectively,which were comparable to those of petroleum based PET primary fibers;and this recycling method provided a new feasible approach for the chemical recycling of waste polyester textiles from fiber to fiber.
NETL
NSTL
万方数据
维普
