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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

A influência de tratamentos com quitosana na solidez da cor a lavagem em camisetas de algodão com estamparia digital / Chitosan influence on color fastness to washing of cotton t-shirts with digital printing

Oliveira, Guilherme Venancio de 15 September 2017 (has links)
A utilização da quitosana como fixante de corantes tem se mostrado relevante, devido a sua estrutura química que é responsável pelas suas propriedades biodegradável e antibacteriana. O presente estudo teve como objetivo principal utilizar a quitosana para auxiliar na fixação de corantes pigmentados utilizados na estamparia digital. Também foi testada a carboximetilcelulose. A quitosana foi dissolvida em ácido acético 2% (v/v) nas concentrações de 5, 10, 15 e 22,2 g/L, enquanto a carboximetilcelulose foi dissolvida em água na concentração de 14,28 g/L Os polímeros foram aplicados como pré e pós tratamentos em malha de algodão por dois processos diferentes, via Foulard e por estamparia de quadros. A presença dos polímeros impregnados nas fibras de algodão foi avaliada por Microscopia Eletrônica de Varredura (MEV). As amostras de malha tratadas e não tratadas (controle) foram lavadas por 54 vezes simulando o uso de uma camiseta durante um ano e avaliadas em espectrofotômetro quanto à solidez da cor a lavagem utilizando os parâmetros escala cinza e sistema CIELAB E*. Os resultados obtidos mostraram que a utilização da quitosana e da carboximetilcelulose como pós-tratamento melhoraram o desempenho da solidez da cor a lavagem em 64% quando avaliada por CIELAB E* e 68% respectivamente quando avaliada por escala cinza. As amostras com aplicação de quitosana e carboximetilcelulose como pré-tratamentos apresentaram valores menores de solidez, quando comparadas às amostras pós-tratadas / The use of chitosan as binder has become relevant due to its chemical structure which is responsible for its biodegradable and antibacterial good. The present study is aimed to the use of chitosan to aid in the fixation of pigmented dyes used in digital printing. A carboxymethylcellulose was also tested. The chitosan was dissolved in 2% (v / v) acetic acid at the concentrations of 5, 10, 15 and 22.2 g / L, while a carboxymethylcellulose was dissolved in water at 14.28 g / L. applied as pre and post treatments in cotton mesh by two different processes, Foulard and silk-screen. The presence of polymers impregnated in the cotton fibers was evaluated by Scanning Electron Microscopy (SEM). The treated and untreated mesh samples were washed 54 times simulating the use of a T-shirt for one year and evaluated in spectrophotometer for color fastness to wash, using the CIELAB E * system. The results showed that the use of chitosan and carboxymethylcellulose as a post-treatment improved the color wash performance in 64% when evaluated by CIELAB E * and 68% when evaluated by gray scale. The samples with application of chitosan and carboxymethylcellulose as pre-treatments presented lower values of color fastness, when compared to the post-treated samples
2

A influência de tratamentos com quitosana na solidez da cor a lavagem em camisetas de algodão com estamparia digital / Chitosan influence on color fastness to washing of cotton t-shirts with digital printing

Guilherme Venancio de Oliveira 15 September 2017 (has links)
A utilização da quitosana como fixante de corantes tem se mostrado relevante, devido a sua estrutura química que é responsável pelas suas propriedades biodegradável e antibacteriana. O presente estudo teve como objetivo principal utilizar a quitosana para auxiliar na fixação de corantes pigmentados utilizados na estamparia digital. Também foi testada a carboximetilcelulose. A quitosana foi dissolvida em ácido acético 2% (v/v) nas concentrações de 5, 10, 15 e 22,2 g/L, enquanto a carboximetilcelulose foi dissolvida em água na concentração de 14,28 g/L Os polímeros foram aplicados como pré e pós tratamentos em malha de algodão por dois processos diferentes, via Foulard e por estamparia de quadros. A presença dos polímeros impregnados nas fibras de algodão foi avaliada por Microscopia Eletrônica de Varredura (MEV). As amostras de malha tratadas e não tratadas (controle) foram lavadas por 54 vezes simulando o uso de uma camiseta durante um ano e avaliadas em espectrofotômetro quanto à solidez da cor a lavagem utilizando os parâmetros escala cinza e sistema CIELAB E*. Os resultados obtidos mostraram que a utilização da quitosana e da carboximetilcelulose como pós-tratamento melhoraram o desempenho da solidez da cor a lavagem em 64% quando avaliada por CIELAB E* e 68% respectivamente quando avaliada por escala cinza. As amostras com aplicação de quitosana e carboximetilcelulose como pré-tratamentos apresentaram valores menores de solidez, quando comparadas às amostras pós-tratadas / The use of chitosan as binder has become relevant due to its chemical structure which is responsible for its biodegradable and antibacterial good. The present study is aimed to the use of chitosan to aid in the fixation of pigmented dyes used in digital printing. A carboxymethylcellulose was also tested. The chitosan was dissolved in 2% (v / v) acetic acid at the concentrations of 5, 10, 15 and 22.2 g / L, while a carboxymethylcellulose was dissolved in water at 14.28 g / L. applied as pre and post treatments in cotton mesh by two different processes, Foulard and silk-screen. The presence of polymers impregnated in the cotton fibers was evaluated by Scanning Electron Microscopy (SEM). The treated and untreated mesh samples were washed 54 times simulating the use of a T-shirt for one year and evaluated in spectrophotometer for color fastness to wash, using the CIELAB E * system. The results showed that the use of chitosan and carboxymethylcellulose as a post-treatment improved the color wash performance in 64% when evaluated by CIELAB E * and 68% when evaluated by gray scale. The samples with application of chitosan and carboxymethylcellulose as pre-treatments presented lower values of color fastness, when compared to the post-treated samples
3

Influence of supercritical carbon dioxide (scco2) dyeing parameters on color fastness of polyester fabric dyed with disperse dye : A study towards minimizing the energy consumption of polyester (pet) fabric dyeing with azo disperse dye

Das, Tapas January 2023 (has links)
Amid growing environmental concern and continuous depletion of natural resources (such as water), the textile industry is constantly searching for sustainable production process. Traditional dyeing processes, notorious for their enormous water consumption, have led society to search alternative dyeing method. Super critical carbon dioxide (scCO2), emerging as a promising dyeing medium shows a potential solution to mitigate water utilization, consequently raising sustainable textile material wet processing. As this innovative technology characterize by its waterless nature, no effluents are generated and conserves enormous amount of water, energy while increasing productivity. Although it has attained commercial focus in polyester fabric dyeing, the imperative remains to reduce energy demand during dyeing process including commercially available dyes. As a result, the optimization of dyeing conditions assumes crucial importance, broadening the feasibility of these eco-friendly dyeing techniques. The objective of this thesis work is to find out the optimum dyeing conditions of polyester (PET) fabric dyeing with an azo disperse dye (Corangar orange PE3330) utilizing supercritical carbon dioxide (scCO2) as a dyeing medium. The investigation aims to unravel the dynamic correlation withing scCO2 dyeing conditions and dye performance. To conduct this study, comprehensive methodology employing a statistical design of two-level three-factor (23) full factorial design was adopted. The studied factors enclose temperature, pressure and dyeing durations, enclosing ranges of 80-1200C, 10-25Mpa and 1-2 hours respectively. Dye concentration was kept constant at 0.2%. The study looks for individual conditions of studied parameters and their impacts on color strength (K/S). Moreover, an analysis of color fastness attributes, comprising washing, sublimation, rubbing and extraction, is carried out. The statistical analysis shows that the prominence of pressure and temperature as the principal factors in scCO2 dyeing medium. Differential scanning calorimetry (DSC) analysis proves the negligible morphological transition in PET fabric following dyeing (crystallinity % for dyed and undyed fabric is 28.80 and 28.42% respectively). Findings also shows that comparable color properties to the traditional standard of PET fabric can be obtained by adapting dyeing pressure (20Mpa) and time (1 hour) while keeping the dyeing temperature (1200C). The findings concluded that satisfactory color strength (K/S) and color fastness related to the standard scCO2 dyeing process can be obtain with reduced energy and pressure. The outcome of this study subtle the relationship between temperature, pressure, and time towards color strength (K/S) and color fastness properties. Nonetheless, investigation of this study remained confined to laboratory-scale and for the purpose to upscale this finding for commercial use, it is crucial to carry out rigorous industrial trials.
4

A influência dos detergentes em pó comercial na solidez da cor à lavagem doméstica dos substratos têxteis / The influence of detergents on commercial powder on color fastness to domestic washing of textile substrates

Salvi, Paulo Sergio 29 November 2017 (has links)
A presente pesquisa consiste em analisar a solidez da cor dos substratos têxteis à lavagem, perante a utilização de detergentes em pó comerciais, e comparar com a utilização do detergente pó padrão previsto na norma ABNT NBR ISO 105-C06: Têxteis Ensaios de solidez da cor parte C06: Solidez da cor à lavagem doméstica e comercial. Para que as variáveis do substrato têxtil: a) composição; b) preparação para o tingimento; c) processo de tingimento; d) intensidade da cor; e) classe de corante. E as do processo de lavagem: temperaturas não comprometessem a conclusão da pesquisa, contemplou-se o controle de todas elas, de forma que, a única variável foi o tipo de detergente em pó utilizado, para tanto, levou-se em consideração: a) utilizado substratos 100% algodão, 100% poliéster, 100% poliamida e 100% acrílico; b) preparação para garantir a homogeneidade das amostras; c) substratos tintos em cores claras, médias e escuras; d) utilizadas classes de corantes que possuem boa solidez à lavagem; e) lavagem a 40ºC e a 60ºC. Foi utilizado um ambiente integrado contemplando equipamentos de laboratório para preparação, tingimento das amostras e para os ensaios de solidez da cor à lavagem, segundo a norma técnica específica. Os corpos de prova, após o processo de lavagem, foram submetidos à avaliação da alteração da cor, de acordo com a norma ABNT NBR ISO 105-A05: Têxteis Ensaios de solidez da cor parte A05: Avaliação instrumental da alteração da cor para classificação na escala cinza. Os resultados dos ensaios apontaram que somente os substratos 100% algodão e 100% poliamida, cor clara, lavados com detergentes comerciais apresentam resultados divergentes dos lavados com detergente padrão. Já os demais substratos não apresentaram alterações significativas quando comparados aos resultados obtidos na lavagem com o detergente padrão, o que aponta que o tipo de detergente utilizado no ensaio não influencia no resultado / The present research consists in analyzing the fastness of colors in textile substrates to washing, in relation to the use of commercial powder detergents, and compare it with the use of the standard detergent powder according to ABNT NBR ISO 105-C06: Textiles - color fastness of C06: Color fastness to domestic and commercial washing. So that the variables of the textile substrate: a) composition; b) preparation for dyeing; c) dyeing process; d) color intensity; e) dye class. And the of washing process: temperature, did not compromise the conclusion of the research, it was contemplated the control of them all, so that the only variable was the type of detergent powder used, for that, it was taken into consideration: a) used 100% cotton, 100% polyester, 100% polyamide and 100% acrylic substrates, because they are the most consumed fibers in Brazil; b) preparation to guarantee the homogeneity of the samples; c) red substrates in light, medium and dark colors; d) classes of dyes, which have good wash fastness, were used; e) washing at 40 ° C and at 60 ° C. An integrated environment was used, contemplating laboratory equipment for preparation, dyeing of the samples and the tests of color fastness to the wash, according to the specific technical standard. After the washing process, the specimens were submitted to the color change evaluation according to ABNT NBR ISO 105-A05: Textiles - Color fastness tests part A05: Instrumental evaluation of the color changing for Classification on the gray scale. The results of the tests indicated that only the 100% cotton and 100% polyamide substrates light colored washed with commercial detergents showed divergent results from the standard detergent washings. However, on the other substrates, did not present significant alterations when compared to the substrates obtained in washing with standard detergent, which indicates that the type of Detergent used in the test does not influence the result
5

A influência dos detergentes em pó comercial na solidez da cor à lavagem doméstica dos substratos têxteis / The influence of detergents on commercial powder on color fastness to domestic washing of textile substrates

Paulo Sergio Salvi 29 November 2017 (has links)
A presente pesquisa consiste em analisar a solidez da cor dos substratos têxteis à lavagem, perante a utilização de detergentes em pó comerciais, e comparar com a utilização do detergente pó padrão previsto na norma ABNT NBR ISO 105-C06: Têxteis Ensaios de solidez da cor parte C06: Solidez da cor à lavagem doméstica e comercial. Para que as variáveis do substrato têxtil: a) composição; b) preparação para o tingimento; c) processo de tingimento; d) intensidade da cor; e) classe de corante. E as do processo de lavagem: temperaturas não comprometessem a conclusão da pesquisa, contemplou-se o controle de todas elas, de forma que, a única variável foi o tipo de detergente em pó utilizado, para tanto, levou-se em consideração: a) utilizado substratos 100% algodão, 100% poliéster, 100% poliamida e 100% acrílico; b) preparação para garantir a homogeneidade das amostras; c) substratos tintos em cores claras, médias e escuras; d) utilizadas classes de corantes que possuem boa solidez à lavagem; e) lavagem a 40ºC e a 60ºC. Foi utilizado um ambiente integrado contemplando equipamentos de laboratório para preparação, tingimento das amostras e para os ensaios de solidez da cor à lavagem, segundo a norma técnica específica. Os corpos de prova, após o processo de lavagem, foram submetidos à avaliação da alteração da cor, de acordo com a norma ABNT NBR ISO 105-A05: Têxteis Ensaios de solidez da cor parte A05: Avaliação instrumental da alteração da cor para classificação na escala cinza. Os resultados dos ensaios apontaram que somente os substratos 100% algodão e 100% poliamida, cor clara, lavados com detergentes comerciais apresentam resultados divergentes dos lavados com detergente padrão. Já os demais substratos não apresentaram alterações significativas quando comparados aos resultados obtidos na lavagem com o detergente padrão, o que aponta que o tipo de detergente utilizado no ensaio não influencia no resultado / The present research consists in analyzing the fastness of colors in textile substrates to washing, in relation to the use of commercial powder detergents, and compare it with the use of the standard detergent powder according to ABNT NBR ISO 105-C06: Textiles - color fastness of C06: Color fastness to domestic and commercial washing. So that the variables of the textile substrate: a) composition; b) preparation for dyeing; c) dyeing process; d) color intensity; e) dye class. And the of washing process: temperature, did not compromise the conclusion of the research, it was contemplated the control of them all, so that the only variable was the type of detergent powder used, for that, it was taken into consideration: a) used 100% cotton, 100% polyester, 100% polyamide and 100% acrylic substrates, because they are the most consumed fibers in Brazil; b) preparation to guarantee the homogeneity of the samples; c) red substrates in light, medium and dark colors; d) classes of dyes, which have good wash fastness, were used; e) washing at 40 ° C and at 60 ° C. An integrated environment was used, contemplating laboratory equipment for preparation, dyeing of the samples and the tests of color fastness to the wash, according to the specific technical standard. After the washing process, the specimens were submitted to the color change evaluation according to ABNT NBR ISO 105-A05: Textiles - Color fastness tests part A05: Instrumental evaluation of the color changing for Classification on the gray scale. The results of the tests indicated that only the 100% cotton and 100% polyamide substrates light colored washed with commercial detergents showed divergent results from the standard detergent washings. However, on the other substrates, did not present significant alterations when compared to the substrates obtained in washing with standard detergent, which indicates that the type of Detergent used in the test does not influence the result

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