Study On The Performance And Dyeing And Finishing Process Of Dralon Fiber

Acrylic has the characters of wool,and due to the increased awareness of animal protection,this performance is unmatched by other synthetic fibers,which establishes the application of acrylic.Recently,German has researched and launched a new fine-denier profiled acrylic,named Dralon.It is spinned by dry spinning technology,the surface of Dralon is smooth,and the shape of cross section is like a dumbbell.Dralon has both the characteristics of superfine and deformed fiber,which determines that Dralon has more features compared with ordinary acrylic,and has a great market prospect.Nowadays,there has few research on Dralon.So the properties and dyeing and finishing process are studied in this paper,the purpose is to make Dralon can be better applied to the market.The main research works in this paper are as follows:First,the molecular structure,crystallinity,surface morphology and thermal properties of Dralon are analyzed and tested by using infrared spectrometer(FTIR),X-ray diffraction(XRD), optical microscope, differential scanning calorimetry apparatus(DSC) and thermogravimetric analysis(TGA),and compared with ordinary acrylic.The results show that the acidic group of Dralon is sulfonic group,the characteristic absorption peak of infrared spectra is consistent with ordinary acrylic, which esplains the chemical composition of the two fibers are almost the same;The crystallinity of Dralon is 84.53%,slightly higher than ordinary acrylic fiber;The cross section of ordinary acrylic is circular,the surface has rough groove,and Dralon appeares a dog bone type cross section,dense smooth surface;The glass transition temperature of Dralon and ordinary acrylic are all at100℃;The initial decomposition temperature of both fibers is about 295℃,the maximum decomposition rate of ordinary acrylic is at 375℃,and Dralon is at 319℃;In addition,the weightlessness rate,the change of white degree and mechanical properties of Dralon after dealing with the different chemical reagent are also researched.The experimental results show that:The weightlessness rate increases with the increase of concentration of alkali agent,and the mechanical properties is reduced,but the basic performance of the fiber is not affected,after the treatment of high concentration of alkali at high temperature,the whiteness of fiber is significantly lower,and the hand feel of fiber turns rough,so this treatment needs to be avoid;By the treatment of strong acid like HCl,H2SO4,the strength is slightly reduced;The influence of the reducing agent on the strength of Dralon is not obvious;Oxidant hydrogen peroxide also has smaller influence on Dralon.Second, the dyeing principle with cationic dye and dyeing process of Dralon are researched,and the experimental results show that the Dralon fiber saturation value with dyestuff like Maxilon Red GRL,Maxilon Yellow GL,Maxilon Blue GRL respectively are1.64%,1.07%,0.78%;The diffusion coefficient,equilibrium adsorption quantity,dyeing rate constant increase with the rising of temperature,half dyeing time decreases;The adsorption type of cationic dye on Dralon conforms to Langmuir, belongs to the positioning of adsorption.Finally,on the basis of performance about cationic dye on Dralon and reactive dye on cotton fabric.The process of one bath one step dyeing of with cationic/reactive dyes is determined.The best dyeing process of dralon/cotton blends is that:sodium sulfate 25g/L,pH=7,dyeing temperature 100℃,dyeing time 60 min,JFC dosage is 0.5 g/L,bath ratio1:30.Blended fabric has good levelness and the resistant to washing fastness and rubbing fastness are better after dyeing. But the dyeing rate of blended fiber is lower than one-component.