Layered clay aqueous dispersion as a novel dye leveling agent in leather processing: Synthesis, characterization and application studies

Mandal, Sujata; Natarajan, S.; Suresh, Surisetti; Jothi, G. Edward Gnana; Muralidharan, C.; Mandal, Asit Baran

doi:10.1016/j.clay.2015.07.002

Cited by 11 publications

(5 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The bands observed in the lower frequency region between 826 and 554 cm −1 of the spectrum are deduced to be the lattice vibration modes and can be assigned to M–O bonds (M ≡ Mg and Al). The absorption band observed at 1383 cm −1 is the characteristic band for interlayer nitrate ion (NO 3 −1 ) 35 …”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Polyurethane‐layered double hydroxide nanocomposite foam: in situ synthesis by reaction injection molding and characterization

Mukherjee

Mandal

Saraswathy

et al. 2022

Polymer International

Self Cite

View full text Add to dashboard Cite

In the present work, a series of polyurethane ayered double hydroxide (PU‐LDH) nanocomposite molded foams were developed using Mg/Al LDH as the chemical blowing agent. Morphological, physicochemical, thermal and mechanical characterizations were performed to elucidate the mechanistic insight of the chemical blowing effect of the LDH and subsequently its enhanced blowing (foam formation) property. The characterization of standard urethane peaks by Fourier transform infrared spectroscopy attenuated total reflectance (FTIR‐ATR) studies confirmed PU foam formation. The DSC thermogram of all the PU‐LDH nanocomposite foams shows a low temperature glass transition for the soft segment (Tg) and a high temperature peak related to the hard segment. The TGA and DSC studies also reveal an improved phase separation behavior of the nanocomposite foam with increase in LDH content. The volume of the foam generated is increased with increase in LDH. The developed PU‐LDH nanocomposite foams are flexible and light weight. The results demonstrate that LDH can be an alternative cost effective and environmentally friendly blowing agent, whilst supporting other thermal, mechanical and chemical properties through synergistic optimization for the intended/specific application. © 2022 Society of Industrial Chemistry.

show abstract

Section: Resultsmentioning

confidence: 99%

“…The absorption band observed at 1383 cm −1 is the characteristic band for interlayer nitrate ion (NO 3 −1 ). 35 The TGA and first derivative of the TGA thermogram (DTG) of the LDH calcined at 300 °C are presented in Fig. 2(c).…”

Section: Characterization Of the Ldhmentioning

confidence: 99%

Polyurethane‐layered double hydroxide nanocomposite foam: in situ synthesis by reaction injection molding and characterization

Mukherjee

Mandal

Saraswathy

et al. 2022

Polymer International

Self Cite

View full text Add to dashboard Cite

show abstract

“…Most importantly, POLTD contains an O -diphenol hydroxyl group on L-DOPA, akin to vegetable tanning agents, which could well tan synergistically with the Al 3+ tanning agent . It is generally recognized that the Al 3+ tanning agent could react with the O -diphenol hydroxyl group and form a stable penta-basic chelate and then coordinate with carboxyl groups on the leather collagen fibers, , thus enhancing the properties of the crust leathers and improving the water-resistant defect of the Al 3+ tanning agent. In brief, the T S of POLTD-Al tanning increased effectively, and the defects of Al 3+ were improved, which proves that combined POLTD with Al 3+ could have a favorable synergistic tanning effect, and the proper dosage of Al 3+ is 6%.…”

Section: Resultsmentioning

confidence: 99%

Biomimetic and Multifunctional Polypeptides for Green Leather Processing: Design, Preparation, and Properties

Jin,

Wang,

et al. 2024

ACS Appl. Polym. Mater.

View full text Add to dashboard Cite

Chrome tanning is the most widely used method in the leather industry; however, the resulting chromium residue causes great harm to both the environment and humans. Inspired by mussel adhesive proteins, a series of Cr 3+ -free, multifunctional, environment-friendly, and amphiphilic poly[L-ε-N-oleoyl lysine-b-(L-threonine-ran-L-DOPA)]s (POLTD) were synthesized and employed as leather tanning agents with fatliquoring and filling effects. These well-degradable polypeptides could determine the hydrothermal stability and mechanical properties of the leathers by different monomer ratios and average molecular weights. Through the orthogonal optimizations of polymer structures and tanning process parameters, results show that POLTD effectively increases the shrinkage temperature of leathers to about 40 °C higher than that of hides, up to 73.5 °C, and thickens the leathers by about 30%. While combined with tanning, POLTD synergies well with Cr 3+ and Al 3+ tanning agents; it not only enhances the absorption and reduces the usage amount of metal tanning agents as well as water pollution, but also improves leather performances, such as the poor washability of Al 3+treated leathers. Coincidentally, POLTD further fills and liquefies the leather collagen fibers in retanning processes and improves the properties of chrome tanning leathers. These findings provide a simple, nonpollution, and environmentally friendly application of polypeptide materials to meet the related technologies toward eco-friendly leather manufacture.

show abstract

“…In this line of thinking, several strategies have been developed to enhance the uptake of dyes on chrome tanned leather, the most common being practiced is cationic pretreatment of the leather surface thereby enhancing the electrostatic attraction between the dye and the substrate. , On the other hand, this kind of pretreatment ends with the release of an unreacted cationic agent which leads to more pollution. Similarly, the uses of dyeing auxiliaries like leveling and fixing agents − to fix a greater amount of dye on the surface were attempted with numerous disadvantages. , Even when colored evenly, uniformity and depth are major constraints. Some of the drawbacks such as poor wet and perspiration fastness are overcome by use of dyeing auxiliaries like cationic complexing agents, which complex the dye and thus reduce its solubility and contact with water.…”

Section: Introductionmentioning

confidence: 99%

“…14,15 On the other hand, this kind of pretreatment ends with the release of an unreacted cationic agent which leads to more pollution. Similarly, the uses of dyeing auxiliaries like leveling 16 and fixing agents 16−19 to fix a greater amount of dye on the surface were attempted with numerous disadvantages. 20,21 Even when colored evenly, uniformity and depth are major constraints.…”

Section: ■ Introductionmentioning

confidence: 99%

Tailoring Nanostructured Dyes for Auxiliary Free Sustainable Leather Dyeing Application

Ramalingam

Jonnalagadda

2017

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

Tailoring the dye functionality by nanoparticle structures offers a new opportunity for a sustainable leather dyeing process in the way of an auxiliary free dyeing process irrespective of substrate charge. Encapsulated nanoparticles, which are nanocages from a polymeric silicalike material, have been widely exploited as a template to guide the fabrication of nanostructures, because of their homogenized particle size, easy functionalization, and preparation through a viable route. In this work, functional rich and pH stable dye-encapsulated nanostructured dyes were used as dyeing agents with commercial use in mind. Due to its uniform particle size (50 nm) and surface potential (−48.7 ± 1 mV) over different pH ranges, the fabricated dyeing system showed uniform penetration and fixation irrespective of the different stages of leather processing at different conditions. Thus, the integration of compatibility and ready absorption by proteins provides a practical way to resolve the problem of intensity variation and improper dyeing characteristics of an industrial scale dyeing system. A cost–benefit analysis was also done to study the economic viability of the newer dyeing system. Avoiding auxiliaries and using less dye makes this new dyeing system economically and environmentally beneficial as compared to tradition dyeing. These results demonstrate the flexibility of different dyes in nanoparticle encapsulation and provide new clues for the sustainable leather dyeing process.

show abstract

Layered clay aqueous dispersion as a novel dye leveling agent in leather processing: Synthesis, characterization and application studies

Cited by 11 publications

References 15 publications

Polyurethane‐layered double hydroxide nanocomposite foam: in situ synthesis by reaction injection molding and characterization

Polyurethane‐layered double hydroxide nanocomposite foam: in situ synthesis by reaction injection molding and characterization

Biomimetic and Multifunctional Polypeptides for Green Leather Processing: Design, Preparation, and Properties

Tailoring Nanostructured Dyes for Auxiliary Free Sustainable Leather Dyeing Application

Contact Info

Product

Resources

About