Research On Pigment Extracted From The Byproduct Of Silkworm And Applied To Dye Silk Fabrics

Recently, a revival interest in the use of natural dyes in textile coloration has beengrowing. This is a result of the stringent environmental standards imposed by manycountries in a response to the toxic and allergic reactions associated with synthetic. Themulberry fruit pigment and nibble are the byproduct of silk. Extracting the pigment fromthese can make use of resource in reason, but also endue with silk fabric certain antibacterial, antiUV performance.The systematical studies had been performed on extracting condition of red pigmentfrom mulberry as well as stability of red pigment of mulberry including photostability, thermostability, pH. It was the best condition of extracting that: using 0.1%HCl, materialstrength 1: 2, the temperature in 100℃and the time lasts for 2h.By macroporous absorption resins after static absorbance and state wishout. To set upthe method for purifying mulberry Red pigment in this paper. This thesis also studiedadsorption-equilibrium of silk. The results showed that the kind of adsorption belongs tolinear adsorption, adsorb corresponds to distributing mechanism. Meanwhile, standardaffinity, dyeing enthalpy and entropy of two pigment were calculated.In this paper, the pigments which were purchased and extracted from dry mulberry fruitand Chlorophyll which extract from silkworm prepared sodium copper chlorophyll wereused to dye silk fabrics. Their dyeing performance and dyeing fastness were studied andcompared. Then it was compared the fastness between the fabrics dyed with differentprocess. And the rate of the penetration against UV radiation of the silk fabrics dyed withmulberry was also tested.The mordant dyed fabrics had proved that it was better to the dyeing performance andcolor fastness. But the light fastness was poor. In order to improve the light fastness, usedcitric acid and DP60 to finish the fabric which dyed with mulberry pigment to reduce the electronic cloud density of dyestuff. The result showed it had good results and lightfastness can improve from level 1 to level 3.