| Digital camera can receive not only visible light but also 700~1200nm near infrared light. Because the wavelength of near infrared light is longer than visible light, so the near infrared light can pass through some thin or non-transparent materials, such as fabric, curtain, plastic et al. Some lawbreakers take this advantage to make perspective pictures using digital camera, which goes against the society morality and causes bad effects to our society. Above all, developing a kind of near infrared opaque fiber and fabric, which can not only have a good effect to restrain the bad society phenomenon, protect personal privacy and information security, but also have great market prospect and business value. Two components sheath-core near infrared light opaque fibers with Ti O2, Zr C as near infrared addtives were prepared by melt spinning in this study.Firstly, PET/Zr C and PET/Ti O2 blend chips were prepared and their fundamental performances were studied in this reaearch. Secondly, two components sheath-core and single component near infrared light opaque fibers with different content of Ti O2, Zr C were prepared by melt spinning. Finally, fabrics knitted by the near infrared light opaque fibers were used to evaluate its near infrared opaque properties. Research by capillary flow meter, tensile tester, Thermogravimetric analysis(TG) and Differential scanning calorimetry(DSC) discusses the rheological property, the thermal stability and the crystallization property of PET/Zr C and PET/Ti O2 blend chips, the mechanical properties of near infrared opaque fibers respectively.The UV-Vis spectrophotometer was used to measure the average transmittance of near infrared opaque fabrics during the range of 700~1200nm near infrared light.For near infrared opaque fibers, the results of the rheological properties of PET/Zr C and PET/Ti O2 blend chips show that, the melt viscosity of PET/Ti O2 is higher than the melt viscosity of PET/Zr C at the same temperature. TG and DSC results show that, the initial decomposition temperatures weren’t influenced heavily with the increase of the addition of inorganic solid particles; However, the temperature of maximum weight loss rate indicates that the addition of Ti O2 and Zr C improve the thermal stability of fibers at a certain degree. The addition of Ti O2 and Zr C also improve the crystallization capacity of PET matrix due to the decrease of the Tg, Tcc and the increase of Tmc. The mechanical properties show that, no matter what kind of near infrared opaque fibers, the addition of Ti O2 and Zr C, all have a negative impact on the tensile strength of Partially Oriented Yarns(POY). After the subsequent process of drawing and texturizing, The lowest tensile strength of PET/Ti O2, PET/Zr C and PET/Zr C/Ti O2 Draw Textured Yarn(DTY) reach to 3.20 c N/dtex, 2.04 c N/dtex and 2.60 c N/dtex respectively.For near infrared opaque socks fabric, the near infrared opaque properties of the fabrics were evaluated by UV-Vis spectrophotometer. The results indicate that the average transmittance of all socks fabric decreases with the increase of Ti O2 and Zr C during the range of 700~1200nm near infrared light. The declination degree of the near infrared light transmittance of PET/Zr C near infrared opaque fibers is much larger than the PET/Ti O2 fibers. With the increase of Zr C in PET/Zr C fiber, the near infrared light transmittance decreases heavily, when the content of Zr C ups to 6wt%, the near infrared light transmittance declines to 6.95%. Respond to the sheath-core fiber, with the increase of Zr C in the core part, the near infrared light transmittance decreases accordingly. The declination degree of the near infrared light transmittance of sheath-core fibers is lower than PET/Zr C component fibers. When the content of Zr C in the core part increases to 6wt%, the near infrared light transmittance reaches to 13.57%. Because 3wt%Ti O2 was added in the sheath-part, the color of fabric appears light grey, which well broadens the use field. |
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