Research on near-infrared & visible camouflage for cotton and polyester/cotton fabrics

In order to obtain NIR camouflage,the cotton and polyester/cotton fabrics were dyed by using vat dyes and disperse dyes respectively.The results indicate that the vat blue L-MG and 83962 are of the same class.The near-infrared reflective spectra of the dyed fabrics are shifted to the long wavelength as the concentration of vat blue L-MG increases,and the amount of red shift is correlated to the peak value of visible reflective spectra.When the concentration of the dye is 1%～2%(o.w.f),the reflective spectra of the dyed fabric are very close to that of the green leaves in the NIR region.Except fabrics with satin or honeycomb weaves,the reflective spectra of the fabrics dyed with different dye concentration show no difference in the visible light region and very slight difference in the NIR region.The near-infrared reflective spectra of the dyed fabric are closely related with the dye which has the largest red shift in the NIR region.