| Ultra-high molecular weight polyethylene(UHMWPE)fiber possesses excellent properties of high strength,high modulus,low elongation at break and resistance to chemical corrosion.It has been widely used in bulletproof composite materials,high strength ropes,anti-cutting textile and other fields.UHMWPE fibers are usually made by gel spinning or dry spinning,but both processes are complicated and the processing costs are high.Also,the above processes tend to bring about environmental pollution Currently,UHMWPE fibers are undyed fibers.If colored UHMWPE fibers can be prepared by melt spinning process,which is simple,it will greatly reduce the cost of production.In the meantime,it also has important theoretical and practical significance for spread of high performance polyethylene fiber applications.In this research,different kinds of UHMWPE(UPE-1,UPE-2)and blending components(I,II,III)were chosen.UHMWPE and blending components were mixed on a Haake mixer and a twin-screw extruder.The DSC and capillary rheometer were used for the study of the effect of the dosage of blending components on the melting point and rheological properties of the blends.The blends of UHMWPE and blending components were spun using Mini-Lab and the best blend was chosen.UPE-1/I was spun using a homemade lab-scale melt spinning machine.The polarizing microscope,DSC and a tensile strength tester were used to observe the cross section and to study the crystalinity,mechanical property of melt spinning fiber.The computer color matching system,rubbing fastness,light fastness were used to observe K/S,rubbing fastness and light fastness of melt-spun colored fibers.The results showed that under the same experimental conditions,melt viscosity of UPE-2/blending components was greater than UPE-1/blending components.IIitself flowed poorly and it can not improve flidity of UPE-1.In the meantime,the mechanical properties of UPE-1/III was poor.Under this experimental conditions,UPE-1/I was the optimal blends;UPE-1 and I can be “homogeneously” blended within the temperature range of 230 ℃ to 290 ℃.Single melting peaks,which all fell between the melting points of the two blending components,were observed for the blends with different blend ratio.The melting point of the blends increased with the increase of the content of UPE-1.The blends were found to be the pseudoplastic fluids.In the experimental temperature range of 270℃ to 320℃,with the increase of the addition of UPE-1,melt viscosity and the structural viscosity index of UPE-1/I increased,while activation energy decreased.Melt viscosity and structural viscosity of the blends were not sensitive to temperature.Spinning temperature improved with the increase of the addition of UPE-1.When the blending ratio is 50:50(wt),the tensile strength,modulus and diameter of the UPE-1/I blend fiber which were melt spun on a lab-scale spinning machine were 16.4 c N/dtex,215.0 c N/dtex and 45 microns respectively under the optimal spinning and drawing conditions.At the same test temperature,when the content of masterbatch was less than 3%,lubrication dominated and melt viscosity decreased with the increase of masterbatch.When content of masterbatch was up to 6%,friction dominated and melt viscosity increased.When the masterbatch content accounted for 3%(wt),UPE-1/I/masterbatch blends has good melt spinnability at the temperature of 315℃.The tensile strength,modulus,K/S,rubbing fastness,light fastness,diameter of the UPE-1/I/masterbatch fiber which was melt spun on a lab-scale spinning machine were 12.1 c N/dtex,183.2c N/dtex,1.986,4～5,5 and 68 microns respectively under the optimal spinning and drawing conditions. |
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