Dyeing Properties and Storage Stability of Leaf Powder Prepared from Dyer's Knotweed (I) - by Freeze Drying method -

Abstract

Abstract-The objective of this study is to investigate the efficacy of leaf powder colorants as substitutes for traditional fresh juice extract dyeing. Three kinds of leaf powder colorants were prepared by freeze drying method with or without deep freezing as pre-treatment: one powder colorant from fresh leaf juice with deep freezing; two kinds of powder colorant from fresh leaves with and without deep freezing. Their dyeing properties and storage stabilities were studied and compared with the traditional fresh juice extract dyeing. The presence of indigo in the powder colorants was confirmed by UV/Visible absorption spectra. They showed absorption peak at 602nm which was same with indigo absorption peak. Dyeing was done at low temperature around 6℃. All three powder colorants produced B colors on silk fabrics, showing similar color to the one dyed traditionally with fresh juice extract. The powder colorants from leaves gave higher color strength than the powder from leaf juice. The powder colorant prepared from leaves with deep freezing was the most stable for long term storage as its color and color strength were not changed after 360 days. So, this was used for further dyeing to study the effects of concentration and repeat dyeing on color strength and colorfastness. Fastnesses to dry cleaning and rubbing were fairly good above 4 rating. Further study is needed to improve light fastness. It was concluded that the leaf powder colorant with deep freezing could be used as a substitute for traditional juice extract dyeing at all seasons.

Preparation Method of Indigo Standard Solution and Variation of Indigo Contents in Blue Dye Extract from Breeding Lines of Persicaria tinctoria H. Gross

“…천연색소성분인 인디고 (indigo)를 함유하고 재배생산되어 이 용되는 식물은 세계적으로 3개 종 (species)이 알려져 있는데, 한국, 중국, 일본 등에서 재배하는 마디풀과 (Polygonaceae) 일 년생 초본식물인 쪽 (Persicaria tinctoria H. Gross), 유럽지역 에서 주로 생산하는 월년생 십자화과 초본식물 대청 (Isatis tinctoria L.) 및 인도, 아프리카 등 열대지방에서 재배하는 콩 과 목본식물 인도쪽나무 (Indigofera tinctoria L.) 등이다 (Jang et al, 2011;John and Angelini, 2009). 우리나라에서 쪽을 이용한 염색방법으로 신선한 잎 생즙을 이용한 염색법과 생잎으로부터 청색염료 (니람)를 제조 후 환원시켜 염색하는 방법 (Park et al, 2005;Shin et al, 2009aShin et al, , b, 2010)이 있 다. 쪽 천연염료는 세탁, 일광에 비교적 강한 견뢰도를 가지고 있으며 (Crews, 1987;Ye et al, 2000;Park et al, 2011) 항균성, 항암성, 항산화 작용 등 여러 가지 생리기능을 갖는 것으로 알려져 있다 (Han and Seo, 2008;Lin et al, 2009).…”

Study on the Dyeability and the Colorfastness of Imported Commercial Raw Indigo Powder Dye on Cotton Fabric

“…반면, 생잎 분말 혹은 생쪽 분말이라고 부르는 것 은 쪽잎을 따서 건조시킨 후 잎 자체를 분말화한 염료인데, 연구자에 따라 환원과정 없이 염색한 경 우 (Oh & Ahn, 2011;Shin et al, 2009a)와 환원과정 을 거쳐서 염색한 경우 (Shin et al, 2009b) Kim(1995), Chung(2000), Shin(2004), Choi(2005) (Shin et al, 2009a(Shin et al, , 2009b (Shin, 2004;Chung, 2000), 고틴으로 산화된다 (Kim, 1995;Chung et al, 1998;Chung & Woo, 2002)…”

Natural Indigo Dyeing of Cotton Fabric - One-step reduction/dyeing process -

“…-일단계 환원/염색 공정 - [1][2][3][4][5] , 각 종 환원방법에 대한 접근 [6][7][8][9][10][11] , 색소추출공정 개발 12,13) , 색소분말 제조방법 14,15) 머서화의 여부와 환원 방법에 무관하게 염착 이 증가할수록 명도와 채도가 감소하는 경향을 보였다. 한편 같은 염착 수준에서는 미처리 면 직물이 머서화 면직물보다 낮은 채도를 보이고 있다.…”