Dyeing Silk with Tea Polyphenol

2012 ◽  
Vol 441 ◽  
pp. 83-87 ◽  
Author(s):  
Hong Fei Qian ◽  
Ping Zhu ◽  
Gang Bai ◽  
Yan Chun Liu
Keyword(s):  
Acid Medium ◽  
Ferrous Sulfate ◽  
Aluminum Sulfate ◽  
Color Change ◽  
Weak Acid ◽  
Metal Salts ◽  
Tea Polyphenol ◽  
Color Strength ◽  
Potassium Aluminum Sulfate ◽  
Color Depth

Tea polyphenol (TP) was used to dye silk by the post-mordanting method using three different metal salts as the mordant; ferrous sulfate, copper sulfate and potassium aluminum sulfate. The results were analyzed in terms of color strength (K/S value) and fastness characteristics as well as the influence of variables such as dyeing time, temperature and pH on the color depth of the dyed sample. A weak acid medium and a low dyeing temperature were found to be optimal for adsorption of TP when dyeing silk with TP. Comparing the color shade of dyed silk obtained with different metal salts as the mordant showed that ferrous sulfate gave the highest K/S value followed by copper and then aluminum. During the soaping colorfastness test, a relatively large color change was associated with increased color strength as well as non-staining of adjacent fibers.

scholarly journals A STUDY OF SUSTAINABLE COLORATION OF LYOCELL FABRICS USING EXTRACTS OF TROPICAL ONION SKINS

2019 ◽  
Vol 57 (3A) ◽  
pp. 69
Author(s):  
Bui Mai Huong ◽  
Trinh Thi Kim Hue
Keyword(s):  
Environmental Impact ◽  
Chemical Process ◽  
Aluminum Sulfate ◽  
Wood Pulp ◽  
Natural Dyes ◽  
Color Strength ◽  
Color Coordinates ◽  
Environmentally Sustainable ◽  
Dyed Fabrics ◽  
Potassium Aluminum Sulfate

Lyocell is considered as a new fiber that represents a milestone in the development of environmentally sustainable textiles.  Lyocell is spun from wood pulp cellulose via a green chemical process with NMMO (N-methylmorpholine-N-oxide) solvent. Following the concept of lower the environmental impact of fashion clothing, this study aims to determine the suitable natural dyes recipes with the color extracting from tropical onion skins. Colorants were extracted by dissolving crushed dried onion skins with boiled in water at 100ºC for 20-25 minutes. The ratio of extracting and dyeing are 1:25 and 1:30 respectively. The optimal dyeing condition was found out at 80ºC, 45 minutes with 75% v/v. In addition, a variety of the most commonly used mordants including Potassium aluminum sulfate, Copper (II) sulphate and Iron (II) sulphate were used for mordanting in order to compare the differently mordanted and unmordanted dyed fabrics via color strength (K/S) and CIE L*a*b* color values. It was found that mordant type had an effect on color strength and the color coordinates of fabric dyed with onion skin, which can supply variety of color choices for the same colorants.

scholarly journals Decay Resistance and Color Change of Pine and Beech Wood Impregnated with R. Luteum and R. Ponticum Plant Extracts

2021 ◽  
Vol 72 (4) ◽  
pp. 353-363
Author(s):  
Huseyin Pelit ◽  
Ali Alkan ◽  
Mesut Yalcin
Keyword(s):  
Mass Loss ◽  
Copper Sulfate ◽  
Ferrous Sulfate ◽  
Aluminum Sulfate ◽  
Color Change ◽  
Concentration Level ◽  
Beech Wood ◽  
Decay Resistance ◽  
B Values ◽  
Yellow Color

In this study, the effect of impregnation with natural extracts on decay resistance and color change of pine and beech wood was analyzed. Flowers of Rhododendron luteum and Rhododendron ponticum plants were extracted according to the decoction method and aqueous solutions were prepared at different concentration levels (2 %, 4 % and 7 %). In addition, ferrous sulfate, copper sulfate and aluminum sulfate mordants were added to the solution to improve the properties of the extracts. Then the wood specimens were impregnated with the prepared solutions. The results indicated that the effect of plant species on the mass loss of specimens exposed to T. versicolor (white-rot fungus) was insignificant. Non-mordant extracts had a slight effect on the mass loss of the specimens. However, in pine and beech specimens impregnated with mordant-added (especially ferrous sulfate-added) extracts, mass loss was significantly reduced and resistance to fungal rot was almost completely achieved. The concentration level did not have a significant effect on the mass loss of specimens treated with mordant-added extracts. After impregnation, the L* value of all specimens (especially those treated with ferrous sulfate-added extracts) decreased and the specimens darkened. The a* and b* values increased in specimens treated with non-mordant and aluminum sulfate-added extracts and these specimens tend to have a red-yellow color. The a* value decreased and the b* value increased in wood specimens treated with copper sulfate-added extracts. The green-yellow color trend of these specimens increased. Both the a* and b* values of the specimens treated with ferrous sulfate-added extracts decreased and the green-blue color tendency increased in these specimens. The increase in the concentration level positively affected the determined color changes. The total color change (ΔE*) was higher in wood specimens (especially pine) treated with ferrous sulfate-added R. ponticum extracts.

Dyeing Properties of Chitosan-Sulfamic Acid Solution Treated Wool with Silane Coupling Agent

2011 ◽  
Vol 331 ◽  
pp. 377-381 ◽  
Author(s):  
Xue Mei He ◽  
Kong Liang Xie
Keyword(s):  
Low Temperature ◽  
Acid Solution ◽  
Crosslinking Agent ◽  
Sulfamic Acid ◽  
Weak Acid ◽  
Color Strength ◽  
Surface Appearance ◽  
Wool Fabrics ◽  
Wool Fibers ◽  
Higher Temperature

In this study, wool fabrics were treated with different concentration of chitosan sulfamic acid solution under using 3-glycidyloxypropyltrimethoxysilane (GPTMS) as a crosslinking agent. The structure of treated wool fabrics was investigated by SEM, DSC-TG. Treated wool fibers had a irregular surface appearance, showed the presence of amounts of Nano SiO2 and their aggregates deposited onto surface of wool fibers. The thermal properties were obviously enhanced. Treated wool fabrics is more stable in higher temperature than that of untreatment. Treated wool fabrics were dyed with weak acid red B, and dyeing behaviour were studied by means of by light reflectance measurements. The color strength (K/S value) of treated wool fabrics obviousily increased from 5.33 to 31.68 by comparison with the untreatment. As a result, it can be concluded that the chitosan sulfamic acid solution with GPTMS treatment could improve the weak acid red B low temperature dyeing on wool. Further, low temperature dyeing of wool fabrics with chitosan-sulfamic acid is safe, so the results obtained are quite promising as a basis for possible future industrial application.

Plasma activation and chitosan attachment on cotton and wool for improvement of dyeability and fastness properties

2020 ◽  
Vol 49 (6) ◽  
pp. 483-489
Author(s):  
Aminoddin Haji
Keyword(s):  
Plasma Treatment ◽  
Oxygen Plasma ◽  
Cotton Fabrics ◽  
Metal Salts ◽  
Cotton Fibers ◽  
Oxygen Plasma Treatment ◽  
Synthetic Dyes ◽  
Fastness Properties ◽  
Color Strength ◽  
Content Type

Purpose The dyeing of cellulosic and proteinous fibers with natural and synthetic colorants usually needs large amounts of metal salts to promote the dyeing procedure. To get rid of the necessity to use metal salts, plasma treatment and subsequent attachment of chitosan biopolymer were considered as green processes for surface functionalization of wool and cotton. The purpose of this paper is to investigate the effect of oxygen plasma treatment and attachment of chitosan on the dyeability of wool and cotton fabrics using walnut and weld as model natural dyes, as well as C.I. reactive blue 50 and C.I. acid blue 92 as model synthetic dyes. Design/methodology/approach Wool and cotton fabrics were modified with oxygen plasma and coated with chitosan solution. The un-modified and modified samples were dyed with the above-mentioned dyes under constant conditions. The color strength, color coordinates and fastness properties of the dyed samples were determined and compared. Findings The results showed that oxygen plasma treatment could improve the dyeability and fastness properties of wool and cotton fibers when dyed with all of the above-mentioned dyes. Attachment of chitosan to the plasma-treated samples significantly improved the dyeability of wool and cotton fibers with walnut, acid and reactive dyes. The fastness properties of the dyed samples were enhanced by plasma treatment and chitosan coating. Originality/value This study uses plasma treatment as an environmentally friendly pre-treatment for attachment of chitosan on wool and cotton. This process improved the dyeing properties of both fibers. The use of metal salts in not needed for dyeing of wool and cotton according to the investigated process.

Preparation and Characterization of Cellulose Films with Curcumin

2013 ◽  
Vol 834-836 ◽  
pp. 555-558
Author(s):  
Jaranya Suksulap ◽  
Potjanart Suwanruji ◽  
Jantip Setthayanond
Keyword(s):  
Tensile Testing ◽  
Color Change ◽  
Sodium Hydroxide Solution ◽  
Cellulose Fiber ◽  
Regenerated Cellulose ◽  
Color Strength ◽  
X Ray ◽  
Cellulose Films ◽  
Regenerated Cellulose Fiber

The cellulose film was prepared from regenerated cellulose fiber residue by dissolving the cellulose in sodium hydroxide solution at low temperature (-15 °C). The properties of the prepared film were investigated by tensile testing, Scanning Electron Microscope (SEM), X-ray Diffractometer (XRD) and also swelling ratio. Curcumin was added into the film with three different concentrations. The color strength of the curcumin-added film was evaluated and the color change of this film in different pH was also reported.

scholarly journals Coagulation in Treatment of Swine Slaughterhouse Wastewater

2017 ◽  
Vol 63 (1) ◽  
pp. 15-21 ◽  
Author(s):  
Bui Manh Ha ◽  
Duong Thi Giang Huong
Keyword(s):  
Ferrous Sulfate ◽  
Aluminum Sulfate ◽  
Test System ◽  
Ho Chi Minh City ◽  
Treatment Efficiency ◽  
Slaughterhouse Wastewater ◽  
Jar Test ◽  
Coagulant Dosage ◽  
Pre Treatment ◽  
The One

Abstract In this study, wastewater taken from the Nam Phong swine slaughterhouse, Ho Chi Minh City, was used to evaluate the treatment efficiency of common coagulants, including Alum (Aluminum Sulfate - Al2(SO4)3.18H2O), Poly-Aluminum Chloride (PAC), and Ferrous Sulfate (FeSO4.7H2O), using a jar-test system. The experiments were conducted using the one-factor-at-a-time method to examine three variables which are pH, stirring speed, and coagulant dosage. The results showed that both Alum and PAC perform over 90% removal of colour, turbidity, COD, and total phosphorus (TP) from slaughterhouse wastewater at pH 7 with a stirring speed of 75 revolutions per minute (RPM) and average coagulant dosages of 450 mg/L for Alum and 550 mg/L for PAC. Meanwhile, under the appropriate conditions of pH equal to 10 and 75 RPM with a chemical dosage of 350 mg/L, COD and TP removal efficiencies by Ferrous Sulfate exceed 87%, but those of turbidity and colour only reach 25%. This finding could be a promising coagulation method as a pre-treatment for the swine slaughterhouse wastewater.

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