جستجوی مقالات مرتبط با کلیدواژه « natural dyeing » در نشریات گروه « مهندسی شیمی، نفت و پلیمر »

Today, dyeing with vegetable dyes has been welcomed by consumers due to its compatibility with the environment. Turmeric is a plant with many dyes, which has many healing, antibacterial and antimicrobial properties and has the ability to dye textile fibers, including acrylic. In this research, it has been tried to investigate the colorability of acrylic with turmeric vegetable dye with different mordants under different conditions.Research shows that processes such as fiber mordanting will help establish a bond between acrylic and turmeric. Also, the light and washing fastnesses of the samples is largely dependent on these processes. Therefore, acrylic yarn without mordant and with 5% of different mordants of potassium aluminum sulfate, cupper sulfate II and ferrous sulfate II by pre-mordant method and simultaneous-mordant method in two different acidic pH, 3 and 5, and in three different room temperatures, 60 °C and boiling temperature with 10% of turmeric dye powder were dyed.The results showed that the affinity to absorb turmeric dye by acrylic is high, and the orange-lemon color is obtained without mordant and with potassium aluminum sulfate mordant. Also, Turmeric creates light to dark brown shades with cupper sulfate and ferrous sulfate mordants. Acrylic had a tendency to absorb dye at room temperature and 60 °C. Also, the results showed that changing the pH of the dyeing bath from 5 to 3 had no effect on the absorption of turmeric dye. The best fastnesses were related to samples mordanted with ferrous sulfate with light fastness equal to 5 and washing fastness equal to 8.

The introduction of new plant or animal natural dyes with easy access, suitable color strength, low cost and color fastness is one of the important subjects of research in the field of dyeing. Environmental compatibility, beautiful and attractive color shades beside economic issues have caused the importance of using natural dyes, despite the production of various chemical dyes. In this research, the fruit and leaves of Ficus Johannis Boiss plant with different concentrations was applied as a new environment friendly plant dye for silk fiber dyeing in the presence of four different types of metal mordant. The color characteristics and reflective spectra of the dyed samples were investigated and their color strength was calculated. In addition, the variety of color shades of the fibers dyed with the fruit and leaves of this plant in the presence of different mordents, as well as their light and washing fastness were evaluated. The results showed that by increasing the concentration of the dye, the color strength and absorption of the sample increases and the brightness decreases. Qualitative and quantitative evaluations on the dyed samples proved that the fruit of this plant is able to create a pale red tint on the silk in the presence of aluminum sulfate and Zinc sulfate mordents, while with the other tested mordents, the color turned towards green. The leaves of this plant created a brilliant golden hue on the silk. The product dyed with both types of dyes showed satisfactory light and washing fastness.

The natural fibers of wool as a pile yarn in the hand-woven carpet have an unpleasant odor that makes the user feel uncomfortable. In many researches, scientists have paid attention to the use of different chemical compounds to eliminate unpleasant odors. Synthetic dyes and co-agents have destructive and adverse effects on nature, the use of new and natural resources, especially those that are more biodegradable, has received much attention in the last few decades for scientists around the world and is of great importance. Citrus peels contain substances such as natural oils, linalool compounds, aromatic substances, carotenoids, and anthraquinone dyes, which can be used to improve vegetable dyeing. The aim of this research was to study the efficiency of citrus waste to improve the quality of natural dyeing of woolen yarn with madder and weld. The dyeing characteristics of the samples were studied by measuring the color parameters L* a* b* and K/S dye absorption and the washing, staining, and light fastnesses of the samples. Also, dyed samples' hardness and their odor were qualitatively measured and studied. The results showed that the color quality of dyed woolen yarns was enhanced to some extent in the presence of citrus peel. dyeing fastness in the presence of citrus was improved. Infrared and ultraviolet spectroscopy showed a change in the amount of absorption affected by the presence of citrus peel components in the dyeing bath. The use of orange and lemon peel also improved the natural unpleasant natural odor of wool fibers and their hardness.

Ailanthus altissima is a fast growing, deciduous, and exotic invasive tree that is able to germinate and grow in a wide variety of soil and site conditions. In this study, the dyeing ability of woolen yarn with the fruit of Ailanthus altissima tree as a natural dye was evaluated. The effect of different dyeing conditions such as mordant concentrations (0 to 6% Wt.%), dyeing time at boiling temperature (30 to 90 minutes), pH of the dye bath (3 to 8) and the dye concentrations (60 to 200% Wt.%) on color strength of dyed sample were studied. The color characteristics of the dyed yarns and the optimal condition of the dyeing conditions were evaluated based on the maximum color strength. The antibacterial property of Ailanthus altissima tree fruit extract was investigated against gram-negative (Escherichia coli) and gram-positive (Staphylococcus aureus) bacteria. Independent research variables such as dyeing time, pH of dye bath and dye concentration had a significant effect on color strength and using of alum as a mordant in applied amounts (0 to 6% Wt. %) had a little effect on the color strength of dyed samples. The dyed woolen yarn with Ailanthus altissima tree fruit has good washing and light fastness and presented good antimicrobial properties against gram-negative and gram-positive bacteria in applied concentrations of 12.5% up to 100%.

In the carpet washing workshops, different chemicals are used in order to increase shine in the appearance of the carpet, soften the colors or remove the dye bleeding commonly. This method is known as gold or trade washing process. Due to the great variety of materials used in the process of gold or trade washing and on the other hand dyes with different chemical structure, the effect of different chemicals should be studied according to the structure of dyes. With research and study, suitable chemicals (remove bleeding materials) can be used to have the best result from the gold-washing process. Since silk yarns are used in luxury and high value-added hand-woven carpets, it will be very useful to have the knowledge of using the appropriate chemicals with the least damage on these yarns. In this research, after field studies, the procedure of gold washing that are used in hand-woven carpet washing workshops was identified. Among the common methods that were proposed, two methods were selected for application on silk yarns. Due to the importance of natural dyes, silk yarns were dyed with madder as a popular natural dye in different concentrations and pH of dyeing bath, after that exposed to two methods of gold washing. The color parameters and general fastness of the samples were measured and studied. The results showed that the chemicals used in gold washing affect the color shade of the samples. Color change varied according to the concentration of dye, dyeing method and also the concentration of applied chemicals.

Reseda luteola is a plant species in the genus Reseda. The common name is weld. The plant is rich in luteolin, a flavonoid that produces a bright yellow dye. This dye is more important and noticeable than other natural yellow dyes due to its high transparency and color strength, and better general fastness. Cellulose and waste tissue in natural dyes reduce the efficiency and quality of natural dyeing, occupy a large volume of dyeing equipment with dye plant pulp and complex dye matching. To make maximum use of the dye in the plant, applying the extraction methods is inevitable. Much research has been done in the field of dye extraction from this plant. Extraction of natural dyes from weld with the help of traditional methods such as boiling, soaking and steaming and modern techniques such as Soxhlet, microwave, ultrasound, plasma, membrane, critical liquid and the effect of various solvents such as water, methanol, ethanol, water-ethanol, and water Methanol as well as auxiliaries during dyeing and extraction have been considered by researchers. The results show the effectiveness of some extraction methods compared to the conventional method, different solvents, and the effects of extraction bath pH. The results of dye extraction from weld using filtration methods and wool dyeing led to the superiority of deposition of dyes by alum mordant and then ultrafiltration. Compared to Soxhlet extraction methods with the ultrasonic technique, extraction efficiency was superior and less time and energy was spent in the ultrasound method showed excellent extraction efficiency. In general, research has been demonstrated that dye powder extracted from weld can be used instead of the plant. In addition, use in the pharmaceutical and health industries increases the efficiency and quality of dyeing and can be an excellent alternative to synthetic dyes. In this study, the researches related to different dye extraction methods from the weld, the effect of solvents and auxiliaries on the extraction efficiency, and dyeing quality are reviewed and introduced.

Today, many researches have been done in the field of textile dyeing using natural dyes for environmental protection by reducing the use of co- agent and synthetic dyes. Different herbal dyes are used in dyeing. Due to the widespread use of madder and weld dyes and the different chemical structure of these two dyes, madder and weld dyes were used to dye wool yarn and eucalyptus and pomegranate peel, which are tannins, were used as mordants. Aloe vera, which has a polyphenolic structure, was also used to improve dyeing fastness and preserve the original hue. Based on the results of experiments, it was found that the use of 10% eucalyptus and pomegranate peel reduces the amount of alum mordant to about 1%. They changed the hue of weld in the light color. The use of aloe vera as an herbal mordant had no effect on the final hue of dyes and significantly reduced the use of alum mordant.

Due to the environmetal and health related problems associated with the use of synthetic dyes, there is a growing tendency for the use of eco-friendly and less harmful natural dyes in the textile industry. In this study, the leaves of Citrus aurantium were used as a new source for environmentally-friendly dyeing of wool. The effect of four important variables including dye concentration, mordant concentration, pH, and dyebath temperature on the color strength of the dyed samples was investigated. Box-Behnken design and response surface methodology was employed for the design of the experiments and analysis of the obtained data. the results showed that the highest color strength was obtained when dyeing using 150 %owf of the natural dye powder and 5.5 %owf of aluminum sulfate, at pH=8 and 76 °C. The sample dyed at the optimal conditions was tested for fastness properties and showed acceptable fastness against washing, light, and rubbing.

In this study the natural colorants of Jasir, Madder and Pomegranate skin are considered to be compatible with wool yarns. To this end, the ability to dye each of the dyes of aluminum doped and dentinite sulfates was used as one of the most commonly used methods. The calculation results of this method showed that the dyeing curve of the three colors of dessert and reno are similar to each other. While the ability to dye wool yarn varies with dye of the skin of the pomegranate, it differs from that of the other two dyes. In this way, the similarity of the dyeing ability of the two gestures and the rhine reflects the relative adaptability of these colored materials. While the difference between the dyeing curve of pomegranate skin is low compatibility with jersey and rhinos. After calculating the ability to dye, dyeing of woolen yarn was done by combining two colors in three different dimensions. Then the degree of color matching was measured through common computational relationships. The computational results show that the colors of Madder and Jashir are in good harmony with each other. While the combination of pomegranate peel with any of the two dyes of Madder and Jashir results in low compatibility with weak to weak grades. In addition, the results of this study showed that the two concentrations of dye in the mixed bath and the use of the tooth affect the degree of compatibility and change the degree of color compatibility. Overall, the results of this study showed that the dye of Madder and Jashir are very consistent with each other and can be considered in the bathroom for the coloring of wool. While it is not possible to combine two colorful materials with pomegranate peel due to poor compatibility grade.

Today, for various reasons, including environmental problems, natural ingredients are used instead of synthetic materials in the textile industry, specially the dyeing process. In addition, in the dyeing process, the use of some other herbal compounds gives special properties.  Antibacterial or antimicrobial chemical compounds in the production and using process induce a lot of wastewater into the environment, which is costly to clean and recycle. Textiles are one of the inevitable requirements that all humans use in their lives abundantly. Today, for various reasons, including environmental problems, the tendency to use natural compounds instead of synthetic materials has increased in the textile industry, including the dyeing process. Furthermore, using the herbal compounds can create special properties such as antibacterial and antimicrobial properties in textiles. A lot of research has been done in this regard. This research has been reviewed the results of researches in this area and classified them that will be easy for using in the new research and application of results.

In this study, the extract of Rhuem Ribes L. flowers was used for dyeing of wool fibers. Oxygen plasma was used as a pretreatment to enhance the dyeability of wool fibers and metal mordant was eliminated from the dyeing process. The surface morphology of the wool fibers before and after plasma treatment was investigated by SEM images. FTIR analysis was employed to study the chemical changes imparted to the wool fibers by plasma treatment. The surface of wool fibers was etched and oxygen containing groups were introduced to the surface of wool fibers. The fastness of the dyed samples to washing and light was measured. The plasma treated samples showed better dyeability as well as good fastness to washing and light.

Selection of the best dyeing recipe for yarn dyeing is one of the major concerns for the dyers in handmade carpet and textile industries. The purpose of this work is to develop expert system software for selection of the most appropriate dyeing recipe for handmade woolen carpet with natural dyes. Knowledge based data in this expert system is collected from different sources such as reference books, papers and experienced dyers. After forming the corresponding data-base and surveying the inference engine, Natural Dyes Expert System (NDES(was developed as artifiial intelligent software. The system was designed using C #. net programming software in the Visual Studio platform and graphical methodology of WPF & Direct X. Knowledge data base of the system was created using SQL Server 2014 and also, LINQ technology was employed for connecting the system to the data-base. The system can advise users to choose the best initial dyeing recipe for dyeing wool fiers with natural dyes. The outcomes of the present research can be listed as helping inexperienced dyers, providing extensive information of natural dyes and also presentation of the dyeing recipe alongside with their fial expected color fastness and properties.