Light Fastness Properties Research Articles

Naphthoquinone disperse dyes and their dyeing application to polyethylene terephthalate fabrics

Examination of natural quinone dyes and their dyeing properties exist in the literature. However, disperse dyeing of synthetic quinone dyes on textile materials and examination of these properties are quite rare. In this study, the derivatives of new N-,O-heteroatom-substituted-1,4-naphthoquinone dyes were synthesized with the reactions between 2,3-dichloro-1,4-naphthoquinone with some aromatic and aliphatic N-nucleophiles according to Michael addition mechanism and the exact structure of dyes were specified by using various spectroscopic methods (FT-IR, 1H NMR, 13C NMR, MS, and UV/Vis.) and microanalyses. In the second step of this work, the polyethylene terephthalate fabrics were dyed with these newly synthesized disperse dyes. Dyeing performances such as dye exhaustion (%), color, and color fastness (to washing, alkaline perspiration, acidic perspiration, water, seawater, wet rub, dry rub, sublimation, and light fastness) properties of these dyes on PET fiber fabrics were investigated and compared. The highest color yield (K/S) by 12.33 was obtained with dye compound 10 at a dyeing depth of 3% owf and displayed better dyeing performance than the other dyes studied. In conclusion, PET fibers dyed with dye 2-4-(4-Chlorofenoxyaniline)-3-chloro-1,4-naphthoquinone (dye compound 10) displayed the highest dye exhaustion (%) values, the highest color yields, and excellent washing, perspiration (alkaline and acidic), water and seawater and rub (dry and wet) fastness values with no staining whatsoever.

PAINTS FORMULATION USING DIISOCYANATES AND 1,4 –DIAMINO ANTHRAQUINONE (1,4 DAQ) AS PIGMENTS AND POLYVINYL ALCOHOL AS BINDER, CHARACTERIZATION AND THEIR APPLICATION ON WOOD SUBSTRATE

The Paint and coatings industry produces a huge variety of products that protect, preserve, and also beautify the objects to which they are applied, however, the components are expensive, therefore there is the need to look for alternative constituents which are cheaper and more durable. Emulsion Paints were formulated using colourants produced from diisocyanates and 1,4 diamino anthraquinone and polyvinyl alcohol as binder. The constituents of the paint was stirred mechanically in a ceramic mortar and pestle for 1 hour, and it was applied on the substrate (ceiling board). The coated samples were subjected to physical characterization, viscosity, surface drying time, weathering and lightfastness and compared with a commercial paint (Emulsion paint). The results indicates a very good light fastness property of 6-7, for paints produced from hexamethylene diisocyanate and where resistant to weathering, while paints produced from 1,4 phenylene diisocyanate showed a poor light fastness of 1-2, however it also indicated resistant to weathering. Hexamethylene diisocyanate, is less expensive and is more durable and economical in emulsion paint production compared to 1,4 phenylene diisocyanate which fades easily and is also expensive.

Acrylic Finished Leather Upgraded with Thermoplastic Polyurethane Filament using 3D Printing – A New Generation Hybrid Leather of Synthetic and Natural Polymer

Leather manufacturing process involves a lot of waste disposal which pollutes environment, some of the processes are inevitable. In the present investigation, 3D printing technology was used to reduce the wastage and to cover defective regions in leather. The present study focuses on synthesis of acrylic binder using emulsion polymerization technique. These binders were analysed for solid content for better optimisation of the amount of binder to be utilised for finishing operation. The experimental binder was prepared with 26% solids. Particle size and thermogravimetric analyses were carried out to understand the size and shape of the particles and their thermal resistance. These binders were used for leather finishing and the performance of leather was studied. Surface morphology changes of leathers were studied using Scanning Electron Microscopy (SEM). Wet and dry rub fastness, finish film adhesion, light fastness and organoleptic properties were studied and found to be superior compared with control leathers. The acrylic finished leather with minor defects was taken for 3D printing and designed using Thermoplastic Polyurethane (TPU) as filament. The acrylic finished leather shows good adhesion for TPU and it results in numerous designs in short duration. The new additive was added to leather using 3D printing technology to produce a tailor-made valuable design without any waste disposal and chemical discharge. This invention may convert the rejected waste leather into valuable material and lead to the new generation hybrid leather for use.

Eco-Friendly Dyeing of Tencel Fabric by Using Natural Dye Extracted from Eucalyptus Leaves

The usage of natural dyes as environmentally suitable dyeing methods has extended during the recent years. The prime focus of this research is on the extraction and purification of natural dyes from eucalyptus leaves. With its numerous applications, eucalyptus leaves are highly valued for their diverse application, particularly as a rich source of natural colours. Quercetin is the primary colouring component in eucalyptus leaves. It has been utilized as a food dye with strong antioxidant properties and as an antioxidant. The goal of this research is to dye Tencel fabric using eucalyptus leaf-derived natural dye. The dye was extracted by using an ultrasonic extraction technique. Different ratios of the two mordants copper sulfate and ferrous sulphate were applied. Dyeing was carried out with different temperatures and concentrations and the pre-mordanting method was used for mordanting. The dyed Tencel fabric displayed a good colour strength of (K/S = 4.72), CIELAB values, and good to excellent light fastness (5), wash (4-5), perspiration (4-5), and rubbing (dry and wet = 4-5) fastness properties.

Environmentally friendly dyeing of wool and silk fabrics with natural colorant of turnsole (Chrozophora tinctoria L.).

With the increasing demand for environmentally friendly dyes, natural dye has become an attractive option replacing toxic synthetic dyes. Within the framework of this research, the natural dye of Chrozophora tinctoria L. was extracted using the microwave-assisted extraction method under different operating conditions. The influence of different factors influencing the extraction process (such as pH, extraction time, and microwave power) on the extraction efficiency was investigated by means of a multilevel three-factor design. The suggested model has a high coefficient of determination, indicating high predictability and good approximation. Optimal microwave extraction process conditions were obtained at a value of microwave power equal to 650 W, at a pH of 5 during a period of 3 min. Dyed wool and silk fabrics showed very good washing and light fastness properties.

Silicone nanomicelle dyeing method on polyester fibre: Comparative evaluation of chemical properties, fastness properties, and DFT

Disperse Red 177(9a), Disperse Red 343(9b), Disperse Blue 165(9c), Disperse Blue 165.1(9d), Disperse Blue 366(9e), and Disperse Blue 148(9f) were examined in the solvent. During silicon nanomicelle dyeing, we employed 9(a–f) azo disperse dyes on polyester. On polyester fabric, dye 9(a–f) offers equal washing, light, and rubbing fastness in both the conventional and silicone nanomicelle techniques. The dye can now be transported directly into the fibre core without the use of auxiliary dyes owing to the reduction in the particle size of azo dyes, which is made possible by nanoemulsions superior dispersion. The levelling property of the dispersed dye is enhanced by the dyeing process. When both techniques are applied, the lightfastness properties of all dyes are improved. It provides a very good to outstanding protection factor for textile materials. These 9(a–f) azo disperse dyes have moderate to outstanding photostability, net electrophilicity index, and lightfastness.

Effect of single and binary mixed metal mordant combinations on colorimetric and fastness characteristics of wool yarns dyed with Melissa officinalis L. natural colorants

Melissa officinalis L. plant has been used in European and Iranian traditional medicine since ancient times. This plant possesses various phytochemicals such as volatile compounds, triterpenoids, phenolic acids, and flavonoids. The presence of substantial amounts of flavonoids in M. officinalis L. necessitates further examination of its usage as a source of natural colorants for developing natural and beautiful shades on wool yarns in addition to its pharmaceutical, cosmetic, and food preservative applications. This will definitely add new direction to the use of M. officinalis L. as an effective natural dye source. Therefore, simple adsorption of aqueous dye extract on wool surface was done followed by the evaluation of build-up properties using different metal mordants and their binary combinations. The dyeing was carried out on pre-mordanted wool by exhaust dyeing method and dyed samples were analyzed via reflectance spectroscopy under D65 illuminant and 10° standard observer in terms of color strength, CIEL*a*b*, and CIEL*C*ho values. The results showed that overall 22 eco-friendly shades of very good to excellent washing, rubbing and light fastness properties were produced by facile use of different metallic salts and their combinations on wool fibers.

Valorization of Corn Husk Waste for Textile Applications

ABSTRACT Agriculture biomass is a widely known renewable source that has a high possibility of recycling. The present investigation deals with the extraction, pre-treatment, dyeing, and characterization of natural fiber obtained from agricultural residues of corn husk. Water retted corn husk fibers were subjected to two steps of scouring and bleaching with hydrogen peroxide. The process effectively reduced non-cellulosic impurities, increased cellulose content to almost 79%, enhanced water absorption (431.5%), and increased fiber whiteness (54) with minimal impact on breaking tenacity (17.17 CN/tex). Natural dyeing was performed by using dye extracted from Sappan wood, and it was observed that fiber dyed without mordant exhibits a good color strength (K/S) of 13.21. Optimum dyeing conditions were determined by the response surface methodology, where K/S was kept as the main response. Modern spectroscopic characterization techniques were used for confirmatory analysis. The optimized recipe for natural dyeing is a 20% liquid dye concentration at 70°C for 1 hour, which achieved a K/S of 10.2–10.5 with adequate wash and light fastness properties in the range of 3–4 and 7–8, respectively. The current study will pave the way for the efficient textile application of this abundant but unnecessarily wasted biomass.

Synthesis, Characterization, Textile Dyeing Study and Antimicrobial Activity of 3-(1H-benzo[d]imidazol-2-yl)-2-chloroquinoline

Background: Benzimidazoles are important heterocyclic compounds having significant attention in the pharmacological industry due to their various biological and dying properties. Objective: 3-(1H-benzo[d]imidazol-2-yl)-2-chloroquinoline, a heterocyclic dye (1), was prepared using o-phenylenediamine and 2-chloroquinoline-3-carbaldehyde in the presence of ceric ammonium nitrate catalyst and hydrogen peroxide under reflux condition, which was subjected to mordant and disperse dyeing study and antimicrobial activity to develop antimicrobial textile garment products. Methods: Elemental analysis, NMR, FT-IR, Mass and UV-visible spectroscopic techniques were used to characterize dye (1). Polyester, wool and silk textile fabrics were selected for the evaluation of dyeing assessment of dispersed heterocyclic dye. The in vitro antimicrobial screening was done against Mycobacterium tuberculosis H37Rv, Streptococcus pyogenes, Staphylococcus aureus, Pseudomonas aeruginosa, Escherichia coli, Candida albicans, Aspergillus niger and Aspergillus clavatus strains using standard drugs as reference. Results: The deep brown to green shades were observed for dye (1), particularly on polyester samples and showed excellent wash fastness and light fastness properties. Dye (1) was active against Staphylococcus aureus showing 100 µgmL-1 MIC with 16.5 mm ZOI better than the reference drug ampicillin. It was more active against Candida albicans with 12.5, µgmL-1 MIC with 33 mm ZOI in compared to nystatin reference drug during antifungal screening. In primary screening, the MIC value for antimycobacterial activity was <12.5 µgmL-1 . Conclusion: The characteristics values of spectroscopic data support the chemical structure of dye (1). It may become the potent applicant for the production of antimicrobial textile garment products like socks, stockings, caps, etc. due to its fastness, lightning and antimicrobial activity results.

Influence of Cotton Pre-Treatment on Dyeing with Onion and Pomegranate Peel Extracts.

In this paper the possibility of applying natural dyes on cellulose fibres were researched with respect to the impact of cotton material pre-treatment (scouring, chemical bleaching, mercerization and mordanting), using renewable sources of natural dyes (waste as a source). As mordants, metal salts of copper, aluminium and ferrum were used, and the influence on colour change as well as on fastness properties were analysed. The natural dyes were extracted from onion peel (Allium cepa L.) and pomegranate peel (Punica granatum L.). In spectrophotometric analysis performed of the plant extracts, the onion extract has peaks at 400 and 500 nm, resulting in red-orange colourations and the pomegranate extract shows a maximum at 400 nm, i.e., in the yellow region, which is characteristic of punicalin. Results show significant influence of cotton pre-treatments on colour appearance and fastness properties, caused by pre-treatments affecting the properties and structure of the cotton itself. The positive effect of mercerization on dye absorption and bonding is confirmed. For wash and light fastness properties, more satisfactory results have been obtained for yarns dyed with pomegranate peel natural dye, and the key importance of mordants for fastness properties has been confirmed.

Optimization of Dyeing Process of Natural Dye Extracted from Polyalthia longifolia Leaves on Silk and Cotton Fabrics

ABSTRACT The study approached to extract natural dye from the wastage leaves of Polyalthia longifolia and evaluate the dyeing properties on silk and cotton fabrics. Different analysis techniques were used to understand the characteristics of the dye and apply them to silk and cotton fabrics using UV–Vis spectrophotometer, FTIR, and SEM. The colorimetric properties were analyzed by reflectance spectrometry in terms of L*, a*, b*, c*, h°, and K/S values. The color fastness was investigated in terms of light, wash, rub (dry/wet), and perspiration tests. The optimum dye extraction obtained was 18% at 90°C in 60 min of extraction in the aqueous alkaline medium. The analysis results showed that the extracted reddish-brown colored dyes confirmed the presence of tannins and phenolic compounds. The color was fixed firmly on silk fabrics without any mordant. The post-mordanting method with ferrous sulfate and copper sulfate showed a better shade and lightfastness than other mordanting processes on silk fabrics. Ferrous sulfate and copper sulfate mordanted cotton fabrics showed good light and wash fastness properties. The study observed that the extracted natural dye of P. longifolia has the potential to be used as a textile dye.

Urea-containing azo disperse dyes: Synthesis, application, and structure–property relationship for nylon fabrics

A group of new disperse dyes containing urea groups was synthesized by coupling various diazonium salt with urea-containing coupling components, which were prepared by the reaction between N-(2-Aminoethyl)-N-ethyl-3-methylbenzenamine and p-toluene isocyanate. Then, the structures of the synthesized dyes were characterized by 1H NMR, 13C NMR, FTIR, and MS analysis. The spectral characteristics of the dimethylformamide (DMF) solution and applied properties on the nylon fabric for all of the new dyes were assessed and compared with the amino-containing control dye. Correlations between molecular structure and dyeing properties on nylon fabric for the urea-containing dyes were investigated by using density functional theory (DFT). The results indicated that the dyeing rates of the dyes became slower, and the fastness properties on the nylon fibers, including washing, sublimation, and light, were greatly improved after the introduction of the p-toluenpiride group. The color performance, build-up, and light fastness properties of the urea-containing dyes varied with the diazo components, among which 4-nitroaniline and its cyano substituted analogues performed well. Both dye exhaustion and saturation adsorption on the nylon fabric were negatively correlated with the product (F2.F6) of the dipole moment of the dye (F2) and its molecular weight (F6). In addition, the ClogP value had a significant negative correlation with the washing change fastness, and the dipole moment of the dye was positively correlated with the sublimation change fastness. Also, the dyes with larger molecular volume and molecular weight had lower rates of sublimation changes and wet crocking fastness due to surface adsorption on the nylon fibers.

Synthesis of biscoumarin bifunctional reactive fluorescent whitening agents and their application on nylon-6 fabric

Two new bifunctional reactive fluorescent whiting agents based on joining two coumarin moieties together through triazinyle-stilbene fluorescent moiety have been successfully synthesized, applied on nylon-6 fabrics and then characterized by NMR and elemental analysis. Spectral properties, such as absorption and emission spectra in solution and on fabrics are investigated. The application of all the prepared compounds as fluorescence [fluorescence whiting agents (FWAs)] and their whiteness as well as light fastness properties on nylon-6 fabric have been compared with monofunctional agent. Despite the fact that the FWAs, containing either mono or bis methyl coumarin derivatives, show better whiteness properties than the FWA containing phenyl coumarin derivative, the later compound shows higher light fastness (excellent).

Dyeing and Some Fastness Properties of Novel Perlite-Containing Polyester Woven Fabrics

This article is focused on the comparison of dyeing, and washing and light fastness properties of conventional and novel perlite-containing polyester woven fabrics via color measurements. All the production processes for the regular and perlite-containing polyester filament yarns were the same. The fabrics were dyed with three medium level energy disperse dyes of different hues in order to observe the shade change caused by the intrinsic yellowness of the perlite-containing fabric. Dyeing and fastness properties of the dyed fabrics were evaluated by their corresponding lightness (L*), chroma (C*), color strength (K/S), and color difference (ΔEab*) results. The perlite-containing fabrics showed similar dyeing and fastness characteristics when compared with the regular fabrics. The perlite-added fabrics were dyed in darker color but had lower chroma values than the regular ones. The perlite-added fabrics also had better fastness results than the regular fabrics when the evaluation was performed in the group itself. Intrinsic yellowness of perlite-added fabrics must be taken into account for any attempt to dye the fabric to a pre-designed shade.

Eco-Friendly Procedure for Rendering the Antibacterial and Antioxidant of Cotton Fabrics via Phyto-Synthesized AgNPs With Malva sylvestris (MS) Natural Colorant.

There is a growing interest for producing multifunctional cellulose fabrics using green and sustainable technology. In this study, we explored an eco-friendly procedure for dyeing cotton fabrics with Malva sylvestris (MS) as a natural colorant and rendering antibacterial cotton fabric by the silver nanoparticles. MS colorants were extracted from dried petals in water using the ultrasound technique, cotton fabrics were dyed with the extracted MS colorant at 100°C for 90 min. The colorimetric data and colorfastness properties were investigated in the absence and presence of tannic acid (TA) as a bio-mordant. Results indicated that MS dye had a high potential for reducing the silver nitrate, so that the silver particle size distribution on cotton fabric was obtained 50–80 nm, and TA had a positive effect on the MS extract and reduced Ag on the cotton. Furthermore, the reduction of bacterial growth of the dyed cotton considerably (up to 99%) improved by AgNPs. The wash-, and light-fastness properties of samples dyed with MS were enhanced from moderate to good-very good by mordanting.

Utilization of keratin hydrolysate of wool waste fiber for free-salt dyeing of viscose fabric

Viscose dyeing is one of the major pollutants of water due to the large amount of salt in the dyeing effluent. This study paves the way for improving environmentally sustainable wool waste and highlights a promising invaluable application through salt-free viscose dyeing. The keratin hydrolysate (KH) was obtained using microwave (MW) alkaline hydrolysis then applied on the viscose fabric in the finishing bath formulation using the pad-cure technique. The rheology of the hydrolyzed wool fibers and the amino acids composition using high-performance liquid chromatograph (HPLC) was estimated; furthermore, the fourier transform infrared spectroscopy (FTIR) of freeze-drying keratin hydrolysate was evaluated. Microwave-assisted keratin hydrolysis leads to the breakdown of peptide bonds and the release of low molecular weight proteins and peptides. The color strength (K/S) of the dyed post-finished viscose fabric increased 75% compared with that dyed by conventional technique. FTIR, scanning electron microscopy (SEM) and energy disperse x-ray spectroscopy (EDX) demonstrated and confirmed the effective finishing of keratin hydrolysate. The tensile strength and elongation of viscose fabric did not change after finishing with KH, while the air permeability improved and the light fastness properties for the modified viscose fabrics.

Acridine-based fluorophores with improved lightfastness properties

9-arylated acridine-based derivatives (AUPAO &AUEA) with high visibility, fluorescence, and excellent lightfastness were synthesized in good yield. The molecules were characterized by 1H NMR, 13C NMR, HRMS and further investigated for photophysical properties. Initially, absorption and emission studies were carried out in wide-ranging polarity solvents to choose a solvent of interest for further investigations. Concentration-dependent studies were carried out in ethanol to determine an optimized concentration to study lightfastness studies. These molecules showed excellent lightfastness properties in solution form when compared to commercially available acridine orange. pH-dependent studies were also carried out to observe the behavior of cationic dyes in a wide range of pH to optimize pH for dyeing. The presence of extended conjugation at the 9th position and additional four methoxy groups resulted in highly fluorescent dyes with excellent quantum yield. The steric interactions, higher twist, and unrestricted rotation of the conjugation pathway between the aromatic ring at the 9th position and the acridine core decreased the transition probability and energy transfer that helped improve the lightfastness. The introduction of a hydroxyl group in AUEA increased the solubility and helped in controlled dispersion while dyeing. Further, they were dyed on modacrylic fabric as high visibility fluorophores, and later the color coordinates, color strengths were measured.

Adsorption kinetics of lac dye on eri silk yarn

The use of natural dyes for the dyeing of naturally-derived fibres is of economic and cultural importance in many countries and there is thus ongoing research interest in this area. In the current work, the dyeing of eri silk yarn with lac dye was investigated, with both components being accessed in Thailand. While some qualitative studies of this particular dye-yarn combination have been reported, more quantitative aspects, which could give a deeper molecular understanding of the process, have not been described. The aim of the current research was thus to obtain quantitative details on the kinetics of lac dye adsorption on eri silk yarn which then might also underpin better village-based dyeing procedures. The adsorption kinetics of lac dye on village-produced yarn revealed an increase in the adsorption rate constant and diffusion coefficient with an increase in temperature owing to a diffusion kinetically controlled process. At higher temperatures, a lower affinity and less dye uptake was observed after the equilibrium state had been reached, consistent with an exothermic adsorption process. The effect of a mordant on the dyed eri silk yarn was also assessed. Different shades of colour could be obtained on the silk yarn by changing the mordant used. In addition, post-mordanting with different mordants significantly improved wash and light fastness properties.

Iron-tannin complex effect on coloration and functional properties of silk fabric

The study is related to preparing aesthetic textiles using an extract of Acacia arabica wild bark extract. This extract with ferrous sulphate mordant to produce black color on silk fabric using the pad-dry-steam technique of dyeing gave promising results. Aesthetic values of dyed fabric were analyzed in terms of colorimetric parameters i.e. CIE L*a*b* and colorfastness. The attachment of Acacia arabica wild bark compounds with silk substrate has been confirmed by using Infrared Spectroscopy (IR) analysis. The dyed samples exhibit moderate to good washing fastness and very good light-fastness properties. The ultraviolet protection factor (UPF) values ranged from good to excellent for the silk fabrics. The results confirmed that dyeing with natural dyes from Acacia arabica wild bark extract with ferrous sulphate (FeSO4) as mordant has potential applications in producing black color besides showing good resistance to microorganisms as measured by BPB stain test.

Extraction and Application of Natural Colourant from the Bark of Berlinia Grandiflora on Cotton and Polyamide 6 Fabrics

The aim of this study is to extract and utilise the bark of Berlinia grandiflora as a natural dye source for the colouration of cotton and polyamide 6 fabrics. The solvents used for this study were water, methanol, acetone, and methanol/potassium hydroxide. The best of all the solvents used was water. In the extraction process, the various solvents were extracted with Soxhlet extractor. The optimum colourant extraction was observed at 40 °C for 2 h. The extracted compound was isolated and characterized by UV spectrophotometry; proton and carbon-13 nuclear magnetic resonance, mass spectrometry, and Fourier transform infrared spectroscopy. Mordanting and subsequent dyeing of cotton and polyamide 6 fabrics with the extracted colourant were performed to investigate the dye’s efficiency. Two metal salts, namely copper sulphate and stannous chloride, were used as mordants. Furthermore, the washing, rubbing, and light fastness properties of dyed samples were tested. The results of the fastness tests showed that the natural dye gave light fastness value (3= fair) without the use of mordants, whereas the values were 5 on cotton and 4 on nylon 6 with the use of mordants. The results of fastness of rubbing and washing were excellent for both cotton and nylon. The outcome of the study presents a potentially useful natural colourant for the colouration of natural and synthetic fibers.