Preparation Of Protein/Viscose Fiber And Its Hygroscopic Heat-generating Properties

With the rapid development of science and technology,traditional thermal insulation materials can no longer meet people's demand for lightweight and warm clothing.As a new type of thermal insulation material,hygroscopic heating fiber is of great significance for improving the thermal insulation performance of textile materials.In this paper,based on the study of the modification of cellulose fiber by protein,combined with the mechanism of intermolecular synergy between wool keratin and silk fibroin,the composite protein was added in different proportions in the wet spinning process by pre-spinning blending.A protein cellulose composite fiber with hygroscopic heating function was prepared,and the synergistic effect of keratin and silk fibroin on the basic structure and moist heat performance of protein cellulose fiber was studied.Based on the wet spinning process,wool and silkworm cocoons were used as raw materials to prepare keratin and silk fibroin solutions by alkaline hydrolysis.The orthogonal experiment was carried out to explore the best preparation of keratin solution and silk fibroin solution by alkaline hydrolysis.Process conditions.The results show that the optimum conditions for the preparation of wool keratin solution are 2.5% sodium hydroxide,reaction temperature 80 ° C,reaction time 2 h,bath ratio 1:3;the best preparation of silk fibroin solution The process conditions were that the amount of sodium hydroxide added was 8%,the reaction temperature was 80 ° C,the reaction time was 7 h,and the bath ratio was 1:20.In order to investigate the effect of the amount of protein solution added on the viscosity of the spinning dope,we blended the protein solution with the cellulose spinning dope and tested it with a falling ball viscometer.The results show that in order to ensure the smooth completion of the spinning,the amount of the complex protein solution should be controlled within 7%.At the same time,through the wet spinning process,we prepared keratin viscose fibers and composite protein viscose fibers with different protein contents.The results of Kjeldahl test showed that with the increase of the amount of complex protein solution in the blended spinning solution,the loss rate of protein increased gradually,which indicated that the active groups in keratin and silk fibroin macromolecules The binding ability of the reactive groups in the cellulose macromolecule is limited,so in order to prevent the transition loss of the protein,the amount of the complex protein solution in the spinning dope should be controlled to about 5%.The effects of synergistic effect of keratin and silk fibroin on the structure and mechanical properties of protein cellulose fibers were studied by means of SEM,FTIR,XRD,Kjeldahl method and sonication method.The results of SEM scanning showed that the internal structure of the composite protein viscose fiber was more compact,indicating that keratin,silk fibroin and cellulose have good compatibility.The results of FTIR analysis indicated that there were amide characteristic peaks of wool keratin and silk fibroin in the composite protein viscose fiber,and the physical combination of wool keratin,silk fibroin and cellulose macromolecule was mainly.XRD test results and sonic speed test orientation factors showed that the crystallinity and orientation of the fibers increased slightly with the increase of protein content in the composite protein viscose fiber,and the composite protein did not destroy the crystal structure of cellulose.This suggests that keratin and silk fibroin are mainly located in the amorphous regions of the fibers,which contributes to the improvement of the mechanical properties of the fibers.The mechanical properties of the fiber showed that the fiber breaking strength increased from 2.05 cN/dtex to 2.13 cN/dtex as the protein content in the fiber increased from 0 to 3.58%,but the elongation at break remained at about 18.2%..At the same time,the infrared imager,digital thermometer,oven method and warmth retention were used to investigate the effect of protein content on the wet heat performance of the fiber.The results of infrared imager and digital thermometer show that the introduction of protein into the fiber does help to improve the hygroscopic heat of the fiber,but only when the protein content of the fiber is more than 3%,the fiber can meet the hygroscopic heat of the national standard.Fiber requirements.The moisture regain test results show that with the increase of protein content in the fiber,the moisture regain of the fiber increases slightly.The thermal insulation test results of the fabric show that the thermal retention performance of the protein cellulose(PVF)fiber fabric is slightly better than that of the ordinary viscose(VF)fiber fabric of the same knitting process.