Preparation and properties of light-colored polyamide 6 antistatic fiber masterbatch
Nano titanium dioxide coated with antimony-doped tin oxide(ATO@TiO2)functionalized with stearic acid(SA)was employed as a light-colored conductive filler for the preparation of light-colored antistatic polyamide 6(PA6)fiber masterbatch-es via melt blending.The dispersion of ATO@TiO2 in the PA6 matrix and its effects on the conductivity,whiteness,and thermal stability of the masterbatches were investigated by using scanning electron microscopy,resistivity tester,colorimeter,and thermo-gravimetric analysis.The experimental results indicate that SA modifier significantly enhances the hydrophobicity of ATO@TiO2,the compatibility with PA6 matrix and the dispersion uniformity of ATO@TiO2 in PA6.With SA content at 0.5wt%,the water contact angle of SA-modified ATO@TiO2(SA-ATO@TiO2)markedly rises to 135.65°.When the volume fraction of SA-ATO@TiO2 is 50%,the resistivity of the PA6 masterbatches is markedly reduced,demonstrating excellent conductivity.Furthermore,the incor-poration of SA-ATO@TiO2 augments the thermal stability of the PA6 masterbatches and increases the cold crystallization tempera-ture of PA6.Color tests show that although the brightness of the masterbatches slightly decreases with an increase in SA-ATO@TiO2 contents,the material maintains a good level of whiteness.Light-colored antistatic PA6 fibers were prepared using the composite spinning method,the impact of pre-and post-treatment ATO@TiO2 fiber masterbatches on fiber properties was investigated by using single fiber tensiometer and resistivity tester.The findings demonstrate that compared to ATO@TiO2,the fibers produced from SA-ATO@TiO2 greatly reduce the resistance per unit length of the fibers while maintaining their strength,with the resistance decreasing to 4.24×109 Ω/cm.
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