Influence of water hardness on acid dyeing with silk

Kan, Chi Wai

doi:10.1007/s12221-008-0051-z

Cited by 13 publications

(11 citation statements)

References 9 publications

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“…No entanto, os valores do pH PCZ obtidos podem ser correlacionados com os valores de pH PIE , uma vez que a definição dessas duas características é parecida. Para a seda, o valor do pH PCZ igual a 3,8 correspondeu exatamente ao pH PIE da fibroína determinado por KAN [24] utilizando a técnica de determinação do potencial zeta. Ainda de acordo com AYUB et al [25] e AYUB et al [26] o pH PIE da fibroína situa-se entre 3,8 -3,9. Já para a fibra de lã, o valor do pH PCZ igual a 6,3 ficou dentro da faixa do pH PIE da lã indicado TROTMAN [27] e ROUETTE et al [12] situada entre 4,8 a 7.…”

Section: Determinação Do Ponto De Carga Zero Das Fibrasunclassified

Importância da determinação do ponto de carga zero como característica de tingimento de fibras proteicas

et al. 2017

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RESUMOO ponto de carga zero é uma característica eletrocinética relacionada aos materiais anfóteros, como as fibras proteicas, cuja determinação e conhecimento é crucial para os processos de tingimento e acabamento das mesmas. Esta característica influencia na adsorção do corante do tipo ácido, principal classe de corante aplicado no tingimento das fibras de seda e lã. Durante o tingimento a carga iônica das fibras proteicas é dependente do pH do banho em que se encontram. No pH correspondente ao ponto de carga zero (pH PCZ ), a fibra proteica possui carga neutra. Quando em presença de um banho cujo pH é inferior ao pH PCZ , a fibra fica carregada positivamente e pode, dessa forma, formar ligações iônicas com as moléculas de corante que estão carregados negativamente. Neste artigo, o pH correspondente ao ponto de carga zero foi determinado por um método denominando "experimento dos 11 pontos". Este método necessita de um aparato experimental mais simples e acessível do que os métodos utilizados na determinação do ponto isoelétrico, uma outra característica eletrocinética correlata dos materiais anfóteros. Para a fibra de seda e lã, foram encontrados pH PCZ iguais a 3,8 e 6,3 respectivamente. Tingimentos com corante ácido foram realizados com valores de pH acima e abaixo do pH PCZ . As amostras tingidas em pH menor que o pH PCZ , apresentaram maior intensidade colorística, evidenciando a formação de ligações iônicas entre corante e fibra. Já as amostras tingidas em pH maior que o pH PCZ , pelo contrário, resultaram em menor intensidade colorística. Estes resultados comprovam a importância de se conhecer o ponto de carga zero das fibras proteicas e assim, determinar o melhor pH de tingimento das mesmas. Palavras-chave:Ponto de carga zero. Seda. Lã. Tingimento. ABSTRACTThe point of zero charge is an electrokinetic characteristic related to amphoteric materials such as protein fibers, whose determination and knowledge is crucial for the dyeing and finishing processes of the same. This characteristic influences the adsorption of acid type dye, main dye class applied in dyeing of silk and wool fibers. During the dyeing the ionic charge of the protein fibers is dependent of the pH of the bath in which they are. In the pH corresponding to the point of zero charge (pH PZC ), protein fiber has a neutral charge. When in the presence of a bath whose pH is lower than pH PZC , the fiber is positively charged and can thus form ionic bonds with the dye molecules that are negatively charged. In this article, the pH corresponding to the point of zero charge was determined by a calling method "experiment of 11 points". This method requires

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Section: Determinação Do Ponto De Carga Zero Das Fibrasunclassified

Importância da determinação do ponto de carga zero como característica de tingimento de fibras proteicas

et al. 2017

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“…As the isoelectric point of fibroin is 3.8, 23 the fabric was positively charged at pH 3. This was due to an increased protonation of the amino groups in silk protein, whereas carboxyl groups were essentially non-ionized at lower pH.…”

Section: Resultsmentioning

confidence: 99%

Ecofriendly dyeing of silk with extract of yerba mate (Ilex paraguariensis)

Giacomini

Menegazzo

Santos

et al. 2016

Textile Research Journal

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Silk fabric was dyed with extract of roasted yerba mate ( Ilex paraguariensis). Dyeing experiments were carried out at varying dyestuff concentration, temperature and pH. The influence of mordants, such as potassium alum and tannin, was investigated. The best results in dyeing were produced with 20 g L–1 of dyestuff concentration, pH 3 and temperature of 90℃. Mordants showed negligible influence. The kinetic study showed that the pseudo-second-order equation better represented experimental data, which is related to the chemisorption process as the rate-controlling step. The equilibrium data were easily adjusted by the Langmuir–Freundlich model, indicating the significant contribution of the chemisorption process in a monolayer followed by a multilayer physisorption. The thermodynamic study indicated that dye adsorption was spontaneous and endothermic.

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“…K / S values in the range of 400–700 nm were measured based on eq 1. 3 A higher K / S value represents better color strength of the dyed substrates. K / S sum values were obtained by the sum of K / S values obtained over a wavelength of 400–700 nm.…”

Section: Methodsmentioning

confidence: 99%

“…Water hardness can be regarded as the amount of calcium and magnesium salts presented in water, and it is expressed as of the calcium carbonate (CaCO 3 ) equivalent. 3 The unit of measurement is parts per million (ppm). If the amount of hardness in water is less than 60 ppm, it is regarded as soft water.…”

Section: Introductionmentioning

confidence: 99%

Reverse Micellar Dyeing of Cotton Fiber with Reactive Dyes: A Study of the Effect of Water pH and Hardness

Tang¹,

Lee²,

Wang³

et al. 2019

ACS Omega

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Effects of hardness and the pH value of water in a water pool on PEG-based nonionic surfactant dyeing of cotton fiber with reactive dyes in a heptane reverse micelle system were investigated in terms of the color yield, reflectance, CIE L * a * b * value, and unlevelness. Results reveal that the effect of the water-pool pH value on the color yield and reflectance are more significant than the effect of hardness in the water pool. The dyed fabrics under an alkaline water-pool condition obtain a lower color yield and higher reflectance percentage than those under acidic and nearly neutral conditions. The increase of hardness in a water pool has higher influence on unlevelness of dyed samples than the increase or decrease of the pH value in a water pool. The changes in hardness and the pH value in a water pool did not result in a significant change in CIE L * a * b * values of dyed specimens, and no chromatic change was found in dyed fabrics. Excellent washing fastness results of the dyed fabrics, guaranteeing adequate removal of unfixed dyes, assure accuracy of the results in a spectrophotometric measurement.

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Influence of water hardness on acid dyeing with silk

Cited by 13 publications

References 9 publications

Importância da determinação do ponto de carga zero como característica de tingimento de fibras proteicas

Importância da determinação do ponto de carga zero como característica de tingimento de fibras proteicas

Ecofriendly dyeing of silk with extract of yerba mate (Ilex paraguariensis)

Reverse Micellar Dyeing of Cotton Fiber with Reactive Dyes: A Study of the Effect of Water pH and Hardness

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