Research On Controllable Preparation And Warmth Performance Of Antistatic Uitra-Fine Fiber Spong

With the changing climate and increasingly complex working environment,the impact of cold environment on people’s working life and even life safety cannot be underestimated.In order to slow down the heat loss of human body,people have prepared a series of warming materials with different warming properties.With the progress of textile technology,the warming materials have gradually changed from natural warming materials to synthetic warming materials,the warming performance has brought a large increase,but there are also easy to static electricity and other problems,warmth and comfort performance to be further improved.In recent years,although there has been some research and development on the preparation of fluffy structured fiber materials and fiber aerogel materials by electrostatic spinning,their structural stability and antistatic properties still need to be improved.Therefore,there is an urgent need to develop functionalized thermal insulation materials with good antistatic properties and mechanical properties.In this paper,polysulfone（PSU）/polyurethane（PU）as the main polymer and carbon black（CB）as the conductive component were used to prepare microfibers by electrostatic spinning method,and antistatic microfiber warming wadding with fluffy structure was obtained by one-step preparation by regulating the ambient humidity.By studying the effect of sonication time on the dispersion performance of spinning solution and fiber morphology structure,the optimal sonication time for uniform dispersion of spinning solution was determined.The effects of spinning distance,voltage and solution pushing speed on the fiber morphological structure were further investigated,and it was found that the prepared fiber flocs had good morphological structure when the spinning voltage was 26k V,the pushing speed was 2.5m L/h and the spinning distance was 25cm.The effects of the content of CB particles on the morphological structure,thermal performance and antistatic properties of the fiber flocs were then investigated,and it was found that when the content of CB particles was 2.4wt%,the thermal conductivity of the microfiber flocs was 26.2m Wm^-1K^-1,and the average surface resistivity was 10²GΩ,showing excellent warmth retention and good antistatic properties.Isocyanate（BIP）was further introduced as a cross-linking agent,and cross-linking between fibers was induced by melting the BIP cross-linker at high temperature.By studying the morphology and structure,thermal,mechanical and antistatic properties of the fiber sponge,it was found that the thermal and antistatic properties of the fiber flocs were less affected when the BIP cross-linking agent content was less than 15wt%,and the thermal conductivity was 26.1m Wm^-1K^-1and the surface resistivity was 10³GΩ,but the mechanical properties were more obviously improved by 100 times strain The cyclic compression experiment with 60%strain was found to produce only a small deformation of 5%.When the BIP cross-linker content was 20wt%,the collapse of the fiber floc structure and the deterioration of the fiber uniformity led to a significant decrease in the warmth and antistatic properties.Finally,the morphological structure and thermal performance of PSU/PU-CB fiber flocs were compared with those of commercially available antistatic thermal materials,and the antistatic performance of the fiber flocs was also tested and compared using different testing methods.The results show that the PSU/PU-CB fiber floc has a smaller thermal conductivity and the antistatic properties meet the standard requirements,which demonstrates the promising application of PSU/PU-CB microfiber floc as a functional antistatic warming material.