| Abstract: | The yellowness of new processed down duvet after exposure to light irradiation seems very mysterious,degree of its yellowness sometimes minor,other times serious,seemingly erratic.So it is very essential for down duvet manufacturers to figure out the cause of this problem.The yellowed down duvet was split into two parts firstly,one was the external fabric which treated with antidrilling finish of polyurethane(PU) in advance,the other was filled down.Results showed that yellowing of external fabric was serious while the filled down yellowness was not obvious.However,when the external fabric and the filled down from the same batch of duvet were irradiated under the same condition respectively,the result indicated both the external fabric and the filled down had not yellowed as the above duvet.Therefore,it was inferred that the external fabric's yellowing was possibly induced by one property of the filled down.Then the key performance indicators of the filled down,such as cleanliness,oxygen consumption,and microorganisms,were measured and analyzed,and the extraction liquid of the down was also analyzed by the chromogenic reaction and UV-vis spectra.Results indicated the non-decomposed hydrogen peroxide residued in the filled down which would cause a higher oxygen consumption and induce photo oxidation yellowing of the PU film on external fabric,and the degree of its yellowing increased with the concentration of residual hydrogen peroxide increasing.Hydrogen peroxide composition would speed up the photo oxidation yellowing process and decrease the IR transmittance of PU film.Meanwhile its yellowed degree aggravating. |
