| Due to its good hygroscopicity,softness,skin-friendlyness and resilience,polyamide 6?PA6?fiber has excellent comfort and has been widely used in the textile field.Because of its lightweight characteristic,the development of PA6 fiber with warmth and health properties can not only meet the needs of modern people in the fast-paced life of the office for health and warmth,but also fitted in with the concept of“light-loading”for young people and have broad market prospects.The far infrared fibers from market with the function of keeping warm and health care in the market only had better radiation in the far infrared?>2500 nm?region,but less absorption in the visible?400-760 nm?and near infrared?760-2500 nm?regions,leaded less use of the energy in solar radiation to heat up.Therefore,in this paper,functional inorganic powders were designed,and modified PA6 was prepared by in-situ polymerization,and then the photothermal conversion and far-infrared PA6 fiber were prepared by melt spinning.In this paper,the core shell structure CF@SD with narrow band gap CuFe2O4?CF?powder as the core layer and far-infrared emitting powder SiO2?SD?as shell was prepared by sol-gel method.This structure not only improved the photothermal conversion performance of far-infrared powder,but also enhanced the synergy between photothermal conversion and far-infrared.The results showed that with SD as the shell,the absorption of the powder at the wavelength of 9?m was enhanced,which matched the absorption peak of human body,so the far-infrared radiation was more easily absorbed by the human body.Compared with the CF600@SD and CF,the CF@SD-600 prepared by one-step sol-gel method had lower reflectivity in the range of 1902600nm wavelength,and by mixed with Cs0.33WO3@SiO2?CTO@SD?,the absorbance and heating properties of compounds were greater than that of one single powder.Further,a functional powder with a ratio of 5CF:5CTO was preferably used as a modified functional component.And in order to improve the dispersibility of the functional powder in PA6,photothermal conversion and far-infrared was prepared by in-situ polymerization.The crystallization and rheological behavior of the system were studied.The results showed that the addition of powder made the Avrami index n of system increase,and the value of F?T?reduce,which meant the cooling rate was lower to get the same crystallinity;At the same time,the powder may play a role of steric hindrance in the system,resulted in poor melt flow.The spinning temperature was adjusted accordingly at 290°C.In order to improve the extraction of PA6 before spinning,in the PA6 polycondensation stage,the hot water extractables content in the system was reduced by vacuum conditions,and the results showed that the extractables content was below 2wt%,and the reaction efficiency of the system was improved due to the rapid removal of moisture.Finally,PA6 chips were melt-spun directly without extraction to produce photothermal conversion and far-infrared PA6 fibers,and a series of characterizations were carried out.The results showed that when the low content of powder?1wt%?was added,not only the photothermal conversion performance was improved by 80%,the far-infrared emissivity was also increased by 0.12.And the powders play a role in nucleation in the PA6,which promoted the?crystal formed in PA6.The action of the nucleating agent increased the crystallinity by 16.02%,and the fiber breaking strength after stretching at 3.8 times increased by 0.3 cN/dtex. |
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