Bifunctional amphoteric polymer-based ecological integrated retanning/fatliquoring agents for leather manufacturing: Simplifying processes and reducing pollution

Wei, Chao; Wang, Xuechuan; Wang, Wanni; Sun, Siwei; Liu, Xinhua

doi:10.1016/j.jclepro.2022.133229

Cited by 18 publications

(8 citation statements)

References 33 publications

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“…Normally, the shrinkage temperatures of pure aldehyde-tanned leather, pure vegetable-tanned leather, and leather tanned with synthetic tanning agents are approximately 80, 78, and 82 °C, respectively. To retain the inherent properties of leather, subsequent processing temperatures are generally kept below 60 °C . Consequently, to extend the application of adhesives on leather, the curing temperature of the adhesive should be lower than 60 °C.…”

Section: Resultsmentioning

confidence: 99%

Dual Cross-Linked Gelatin-Based Adhesive for Leather with Low Curing Temperature and Improved Bonding Strength

Zhang,

Zha,

Wang

et al. 2023

ACS Appl. Polym. Mater.

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Section: Resultsmentioning

confidence: 99%

Dual Cross-Linked Gelatin-Based Adhesive for Leather with Low Curing Temperature and Improved Bonding Strength

Zhang,

Zha,

Wang

et al. 2023

ACS Appl. Polym. Mater.

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“…Additionally, the pI of wet finishing material and the pH of the wet finishing process are also key factors influencing the penetration and binding of retanning and fatliquoring agents into the leather fibers. 10 The pI of PAMLD-1 (∼4.6, Figure 1g) is higher than that of FRA (∼2.5, Figure S5). This guides us to control the initial pH of the retanning and fatliquoring process at 6.0 and the final pH at 4.5 in the following application experiment, which regulates the penetration and binding of PAMLD in leather.…”

Section: Characterization Of Pamldmentioning

confidence: 93%

“…Besides, organic tanning agents, such as wattle extract (WE) and active chlorine (AC) tanning agents, usually react with the amino groups of collagen fibers via hydrogen or covalent bonds, enhancing the electronegativity of tanned leather . It may lead to poor fixation of the following anionic fatliquors and dyes in collagen fibers, causing quality defects in finished leather such as oil frost and reduced color fastness . Therefore, it is urgently necessary to develop amphoteric wet finishing materials with the view of surface charge matching.…”

Section: Introductionmentioning

confidence: 99%

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Insights into the Development of Dyeing-Assisting Amphoteric Acrylic Retanning/Fatliquoring Agents for Ecological Chrome-Free Tanned Leather Production

Wang,

Xiao,

Ren

et al. 2024

Ind. Eng. Chem. Res.

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Chrome-free tanning is an emerging trend for the green sustainable development of the leather manufacturing industry. However, conventional anionic wet finishing materials for chrome-tanned leather are not suitable for chrome-free tanning systems due to the imbalance of surface charge between the wet finishing materials and chrome-free tanned leather. In this paper, we have developed a novel and facile approach to synthesizing an amphoteric polymer named PAMLD as a retanning/fatliquoring agent for chrome-free tanned leather. The PAMLD polymer with a suitable particle size (d = 325 nm) and appropriate isoelectric point (pI = 4.6) was prepared by one-step copolymerization in an aqueous solution using acrylic acid (AA), methacrylic acid (MAA), ethyl methacrylate trimethylammonium chloride (DMC), and dodecyl 2-methyl acrylate (LMA) as monomers. The obtained amphoteric polymer was further applied in the wet finishing processing of three types of chrome-free tanned leather. Comprehensive characterizations of leathers treated with PAMLD indicated the retanning and fatliquoring effect of PAMLD on collagen fibers. Moreover, leathers treated with PAMLD exhibited better dyeing properties compared with those treated with the commercial amphoteric wet finishing material (FRA), as evidenced by their superior K/S values and color fastness to rubbing and washing. This research not only provides a feasible approach for preparing multifunctional amphoteric polymers but also offers novel matching wet finishing materials and strategies for variable chrome-free tanned leather production.

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“…Many chemicals have been developed as waterproof fatliquors, such as alkenyl succinic acid, chromium soaps, polysiloxanes, organic fluorine compounds, and amphiphilic polymeric fatliquors [ 5 , 6 , 7 ]. Among these chemicals, amphiphilic polymeric fatliquors have become a research hot spot due to their ability to integrate the retanning and fatliquoring process and shorten the processing time [ 8 , 9 , 10 ]. These polymers usually contain carboxyl groups and alkyl groups with long carbon chains.…”

Section: Introductionmentioning

confidence: 99%

Imparting Waterproofing Properties to Leather by Polymer Nanoemulsion Based on Long-Chain Alkyl Acrylate

Jin

Wen

et al. 2023

Materials

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The demand for waterproof leather has been increasing, and environmentally friendly waterproof fatliquors have recently received increasing attention. In this work, two polymer nanoemulsions containing carboxyl groups were synthesized and used as waterproof fatliquors for chrome-tanned leather. First, a reactive emulsifier (C12-Na) was prepared using itaconic anhydride and lauryl alcohol. Subsequently, two polymer nanoemulsions were prepared through mini-emulsion polymerization with C12-Na as the emulsifier, 4,4′-azobis (4-cyanovaleric acid) as the initiator, and lauryl acrylate (LA)/stearyl acrylate (SA) as monomers; these were named PLA and PSA. PLA and PSA were characterized using FT-IR, a Zetasizer, and GPC. It was found that the critical micellar concentration (CMC) of C12-Na was 2.34 mmol/L, which could reduce the surface tension of water to 26.61 mN/m. The average particle sizes of PLA and PSA were 53.39 and 67.90 nm, respectively. The maeser flexes of leather treated with PLA and PSA were 13928 and 19492 at a 5% dosage, respectively, and the contact angles reached 148.4° and 150.3°, respectively; these values were both higher than for a conventional fatliquor. Compared with PLA, the leather treated with PSA exhibited better fullness, and tensile and tearing strength. The prepared nanoemulsions have prospective applications in leather manufacturing as waterproof fatliquors.

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Bifunctional amphoteric polymer-based ecological integrated retanning/fatliquoring agents for leather manufacturing: Simplifying processes and reducing pollution

Cited by 18 publications

References 33 publications

Dual Cross-Linked Gelatin-Based Adhesive for Leather with Low Curing Temperature and Improved Bonding Strength

Dual Cross-Linked Gelatin-Based Adhesive for Leather with Low Curing Temperature and Improved Bonding Strength

Insights into the Development of Dyeing-Assisting Amphoteric Acrylic Retanning/Fatliquoring Agents for Ecological Chrome-Free Tanned Leather Production

Imparting Waterproofing Properties to Leather by Polymer Nanoemulsion Based on Long-Chain Alkyl Acrylate

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