| Alginate fiber is a renewable artificial fiber with wide sources of raw materials and a low price.Due to its good flame retardant properties,antibacterial properties and moisture absorption properties,it has been widely used in many fields such as biomedicine,food industry,and beauty cosmetics.However,alginate fiber is not resistant to saline and alkaline,and it is easy to gel or even dissolve due to ion exchange in the solution containing sodium and potassium ions.Therefore,it is difficult to dye alginate fiber,which seriously limits the application and development of alginate fiber in the apparel industry.Therefore,it is very promising to realize the dyeing of alginate fiber under the condition that the morphological structure of alginate fiber is not damaged.In this paper,based on previous studies,we propose a solution for the cationic modification of alginate fibers by grafting polymerization of the cationic monomer methacryloyloxyethyl trimethyl ammonium chloride(DMC)onto alginate fibers via atmospheric pressure plasma technology.The modified alginate fibers were subsequently dyed using a conventional direct dyeing process,and the samples were tested and analyzed using Zeta potential,fourier transform infrared spectroscopy(FTIR-ATR),X-ray photoelectron spectroscopy(XPS),K/S,scanning electron microscopy(SEM),and single fiber strength characterization.The results showed that the cationic modification of alginate fibers could be successfully achieved with atmospheric pressure plasma technology,and the modified alginate fibers had good dyeing ability,and the K/S values of direct red,direct yellow,and direct blue in the modified group could reach 9.58,9.13 and 8.67,respectively,while the corresponding K/S values in the control group were only 3.57,2.89 and 1.84,respectively.Regarding the single fiber strength,the strength of untreated alginate fiber was2.33 c N/dtex,and by comparison,the strength of dyed alginate fiber in the modified group was only reduced by 15.5%(red),1.3%(yellow),and 4.8%(blue).Besides,the dyed alginate fibers also showed good fastness to washing with a grade better than 4.Thus,it shows that DMC can be effectively embedded into alginate fiber with the contribution of atmospheric pressure plasma,so that the fibers can be subjected to cationic modification and successfully be dyed under salt-free and alkali-free conditions.In addition,the preparation and performance testing of pure spun yarn of alginate fiber are discussed in this paper.The surface of the cation-modified and dyed alginate fiber is etched by plasma etching and the action of dye in the dyeing solution,which increases the surface roughness and greatly improves the inter-fiber holding force,thus making the pure spinning of alginate fiber possible.The strength,hairiness and dryness uniformity of the pure spun yarn of alginate fiber spun by ring spinning were tested.The Test data show that the 100 m dry weight of alginate fiber pure spun yarn is 4.27 g,the moisture return rate is16.63%,the deviation of 100 m quality is 2.79%;1mm hairiness index is 19.2,2 mm hairiness index is 1.5,3 mm hairiness index is 0.7;the uniform CV of the strip is 22.79%,220 details/km,350 coarse nodes/km,655 cotton knots/km;the breaking Strength is 465.43 c N,breaking strength 10.9 c N/tex,breaking elongation 47.37 mm,breaking elongation9.47%.The pure spun yarn of alginate fiber basically meets the requirements of yarn use and provides a reference for the subsequent research.In this paper,we found that(1)based on the atmospheric pressure plasma technology,we can successfully graft polymerize the cationic monomer methacryloyloxyethyl trimethyl ammonium chloride onto alginate fiber;(2)the modified alginate fibers are positively charged and can be dyed with conventional direct dyes under salt-free conditions to achieve the effect of deep-dyeing alginate fiber;(3)the dyed alginate fibers were successfully spun into pure spun alginate fiber yarn with the support of the new intelligent spinning technology,which provides a new solution for the development and application of alginate fiber in the apparel field. |
