Preparation Of Anti-uv/high Flow Polyamide6Master Batch And Fiber

As the second largest chemical fiber, Polyamide fiber has a series of excellent properties, andit is widely used in the clothing, industrial, carpet and other fields, especially occupying a stablemarket in the field of outdoor sports clothing. While Polyamide6(PA6) has poor properties ofresisting light and heat, and it’s important to increase the UV resisting ability of PA6for outdoorclothes. Now for most of the functional fiber, the functional particles distribute on fibers’ wholecross section and the utilization rate of functional particles is low. Meanwhile, the spinningtemperature is much high for the melt spinning process. So it’s significant to develop a newtechnology with improvement of the spinning ability and high utilization rate of the functionalparticles for functional fiber process.In this paper, melt blending and in-situ polymerization were adopted to produce anti-UV/highflow PA6master batch respectively. The anti-UV PA6fiber was prepared through blend spinningthe anti-UV/high flow PA6master batch and linear PA6. The key point of whole process is thepreparation of high-flow branching PA6.The high flow branching PA6was prepared through hydrolytic polymerization ofcaprolactam by adding pyromellitic dianhydride (PMDA).The influence of adding differentcontent PMDA on the properties of high flow branching PA6was studied, such as polymerizationreactor power, extractive content, relative viscosity and melt flow index. The polymerizationreactor power and melt viscosity of branching PA6chips decline gradually with increasing contentof PMDA, which indicates that the branching PA6has excellent flowability. The extractivecontent of branching PA6at boiling water is about10%and less than that of linear PA6.The PA6/TiO2master batch was produced by screw blending rutile TiO2and prepared highflow branching PA6, and then was melt blended spinning with linear PA6. The UV transmittanceof fiber/sulphuric acid solution was investigated by ultraviolet spectrophotometer.4°C decreasingof the spinning temperature was found at the system of adding the branching PA6, which indicatesthat the branching PA6can improve the spinning process. The UV transmittance of the blends solution are less than10%, showing good anti-UV effect.PA6/TiO2master batch was prepared by in-situ polymerization and was blended with linearPA6for melt spinning. The thermal properties were investigated by thermo-gravimetric analysis(TGA) and differential scanning calorimetry (DSC). The UV transmittance of fiber solution wasinvestigated by ultraviolet spectrophotometer. Fibers’ aging performance was tested by ultravioletlight. We also investigated the UPF of woven fabric, and used SEM to observe the distribution ofTiO2on fiber surface. In the process of spinning, we found the spinning temperature and the screwpressure decreased, which showing that adding the high flow PA6can improve the formingprocess. The result shows PA6/TiO2master batch by in-situ polymerization has good thermalperformance, the UV transmittance of fiber solution are less than10%, and cross section of fibershows large portion of TiO2distributing on the external surface of the fiber. But there existsaggregation. The woven fabrics’UPF was50+, which shows excellent property of anti-UV.