INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2024
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IF 3.8
Yixuan Wang,Yuanhang Xiao,Keshuai Ren,Chunhua Wang,Huiyong Sun,Wei Lin
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.
研究领域:
制革化学
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环境科学
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高分子化学
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产品关联
DOI
高影响因子
JOM
·
2019
·Vol. 72
·期 2
·658-664
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IF 2.305
Shen Zheng-Jun,Lin Yan,Zhang Yan-Nan,Rong Ju,Yu Xiao-Hua,Zhan Zhao-Lin
The porosity of a self-lubricating chromium-free passivation film is evaluated by means of a novel finite element model and structural parameter, λ ( λ represents the porosity of passive film). The applicability of this equivalent model is validated via thin-film thermocouple measurements and laser interferometry. Our results revealed that the roughness of the film can be improved by a lubricating filler. A value of λ = 0.25 yielded the optimal friction and wear characteristics of the self-lubricating chromium-free passivation film. This optimal condition corresponded to temperature values and stress values of 77.99°C (theoretical) and 81.24°C (experimental), and 1.67 × 10 5 Pa (theoretical) and 1.65 × 10 5 Pa (experimental), respectively. The close correspondence between the experimental and the theoretical results indicate that the model is reasonable.
研究领域:
材料科学
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机械工程
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DOI
高影响因子
Journal of Cleaner Production
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2021
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IF 9.297
Xinhua Liu,Wanni Wang,Xuechuan Wang,Siwei Sun,Chao Wei
Comprehensive promotion of chrome-free organic tanning system has become an inevitable trend for cleaner production in leather manufacturing industry. However, the imbalance of interface charge between conventional anionic wet finishing material and organic tanned leather leads to poor quality of finished leather. Herein, a novel amphoteric polymer P (AA-AM-C 12 DM) as retanning and fatliquoring dual-functional wet finishing material was prepared by free radical polymerization using acrylic acid (AA), acrylamide (AM), and (2-methacryloyloxyethyl) dodecyl ammonium bromide (C 12 DM) as raw materials in an aqueous system and further applied in TWS organic tanned leather. Comprehensive structural and performance characterization of P (AA-AM-C 12 DM) confirmed the presence of amphoteric groups and hydrophobic long chains in its structure. Number average molecular weight and isoelectric point were determined to be 6396 g mol −1 and 5.16, respectively. The physical and mechanical properties, morphology of the P (AA-AM-C 12 DM)-treated leather, and their reactivities to anionic dye were investigated. The effect of hydrogen bond and ionic bond , which resulted from reactions between the carboxyl groups , amide groups, cation N + in P (AA-AM-C 12 DM), and the pendant amino groups, hydroxyl groups, carboxyl groups from collagen fibers, benefitted in enhancing the physical and mechanical properties of crust leather and their reactivity to anionic dye. Moreover, P (AA-AM-C 12 DM) showed remarkable environmental benefits compared to the commercial fatliquor, by significantly promoting dye absorption as high as 96.57%. These findings provide a potential application of P (AA-AM-C 12 DM) to coordinate well with an ecological chrome-free organic tanning system, significantly promoting the cleaner production in the leather industry.
研究领域:
材料科学
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环境科学
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皮革化学与工程
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2015
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IF 4.642
Taotao Qiang,Xin Gao,Jing Ren,Xiaoke Chen,Xuechuan Wang
This paper discusses the terminal carboxyl groups of the hyperbranched polymer (HPAE-C) complexing Al3+ in aluminum sulfate to synthesis a new chrome-free tanning agent (HPC-Al). The molecular structure of HPC-Al was characterized and analyzed by IR, UV, and XRD. In the tanning process, the results indicate the following: (1) The shrinkage temperature of HPC-Al tanning leather is 79.5 °C. (2) The shrinkage temperature is greater than 95 °C after chrome retanning and about 87 °C after zirconium retanning. (3) It has greatly improved the fullness, softness, and physical-mechanical properties of the leather. Meanwhile, the environmental impact assessment after tanning was evaluated. The results show that biochemical oxygen demand, total dissolved solids, and total suspended solids are reduced. This indicates that the use of HPC-Al as a tanning agent, with chrome-free or chrome-less tanning, can be achieved.
研究领域:
材料科学
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环境科学
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皮革化学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Jie Chen,Jianzhong Ma,Qianqian Fan,Wenbo Zhang,Ruyue Guo
The development of chrome-free tanning agents is of great significance for the green and sustainable improvement of the leather industry. Metal organic framework (MOFs) is a kind of nanomaterial with steady framework formed by the coordination of metal clusters with organic ligands, which gives it a natural self-masking structure. Herein, two kinds of bimetallic MOFs were obtained via post-synthesis modification and used in the tanning to produce leather with good hydrothermal stability. M n+ - replacing Zr-MOFs is denoted as Zr/M−MOFs (M n+ = Ti 4+ , Al 3+ ). Zr/M−MOFs were characterized by XRD, SEM, FT-IR, TG, XPS, and N 2 adsorption/desorption. The results indicate that M n+ - replacing provides more active site that can be combined with collagen fibers. Compared to the Zr-MOFs tanned leather (75.3 °C), the shrinkage temperature of Zr/M−MOFs tanned leather (79.9 °C) has been further improved. In addition, Zr/M−MOFs can also avoid the problems caused by traditional metal tanning, such as the worse washability of aluminum tanning. A new strategy to improve the tanning performance of MOFs-based tanning agents was provided. It gives a new approach to the development of chrome-free tanning agents.
研究领域:
材料科学
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皮革化学与工程
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2024
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IF 5.3
Lei Yang,Huanlin Zhu,Shouxing He,Wei Weng,Wen Tan,Shuiping Zhong
Passivation treatment is the last key process to ensure the service life of copper foil for lithium-ion batteries. Although chromic anhydride commonly used in industry has an efficient passivation effect, it can threat human health and the environment. Herein, an environmentally friendly passivator is prepared from pomelo peel by a simple and economical solution extraction method, which makes copper foil have good anti-corrosion properties in air, chlorine-containing solution, and organic electrolyte. Electrochemical methods and X-ray photoelectron spectroscopy (XPS) confirm the potential of pomelo peel extractant (PP) to replace chromic anhydride as a passivating agent for copper foil. The interaction mechanism between PP and copper foil is analyzed by adsorption modeling, and the efficient passivation behavior of PP for copper foil is consistent with the Langmuir model. Density Functional Theory (DFT) calculations of the naringin (main component of PP) is performed to further reveal the protection mechanism of PP on copper foil. In addition, the copper foil treated by PP still has excellent electrochemical performance as lithium-ion battery current collector, indicating that the presence of PP not only protects the copper foil from corrosion, but also does not affect the conductivity of the copper foil. This research provides a new insight into the chrome-free passivation of copper foils, which is in line with the development concept of green production.
研究领域:
材料科学
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电化学
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环境科学
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DOI
高影响因子
Journal of Cleaner Production
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2020
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IF 7.246
Lidong Yu,Xihuai Qiang,Lu Cui,Bo Chen,Xinke Wang,Xiaohui Wu
In this research, a syntan containing active chlorine groups (SACG) was synthesized by the condensation of phenol sulfonic acid condensation product (PSAC) and cyanuric chloride (TCT). The structure and composition of as-received syntans were characterized by Fourier transform infrared spectrometer (FT-IR), nuclear magnetic resonance spectroscopy ( 1 H-NMR), and gel permeation chromatography (GPC). The thermal properties and morphology of the tanned leather were analyzed using thermogravimetric analysis (TGA) and scanning electron microscope (SEM). The results indicated that the multi-point active chlorine groups in syntans had an excellent cross-linking effect on collagen fibers, which increased the shrinkage temperature of leather to 81.6 °C. The tensile strength , the tearing strength, and the thickening rate of the tanned leather were 14.26 MPa, 42.56 N/mm, and 78.3%, respectively. The tanned leather exhibited flat and fine grain. The collagen fibers showed uniform dispersion. Besides, the SACG had remarkable environmental benefits compared with the traditional chrome tanning system by significantly reducing the content of chemical oxygen demand (COD), total solids (TS), dissolved solids (DS), suspended solids (SS), chloride, and total chromium analyses (T Cr ) in tannery wastewater and thus could be applied to non-pickling tanning system. Moreover, the SACG tanning technology is a promoting chrome-free tanning technology because of the facile, cost-effective, and environment-friendly performance, suggesting that this technology has great potential to be widely applied in leather manufacturing.
研究领域:
化学
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皮革科学与工程
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环境科学
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2024
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IF 7.1
Xugang Dang,Heng Qiu,Shuguang Qu,Shuang Liang,Lianxiang Feng,Xuechuan Wang
This study aimed to pioneer the development of an innovative, eco-friendly, and chrome-free tanning agent, with a focus on promoting sustainable practices in ecological leather production. Two novel biomass-derived tanning agents, namely, β-TCD and β-GCD, were synthesized through a one-pot grafting process involving environmentally friendly epoxy monomers: triglycidyl isocyanurate (TGIC) and glycerol triglycidyl ether (GTE). Characterization through various analytical methods, including FTIR, 1H NMR, XPS, GPC, SEM, and TGA, confirmed the successful grafting of TGIC and GTE onto β-cyclodextrin (β-CD) backbones. The resulting β-TCD and β-GCD exhibited notable epoxide values of 0.349 and 0.388 mol/100 g, respectively, along with a broader molecular weight distribution of intermediates. These newly developed tanning agents, β-TCD and β-GCD, were then applied in depickling goatskin tanning experiments. Results indicated that the crust leather tanned with β-TCD and β-GCD displayed favorable thermal stability, with shrinkage temperatures reaching 84 and 82 °C, respectively. Moreover, the thickening rates of the leather exceeded 40%. The crust leathers tanned with β-TCD, and β-GCD demonstrated excellent physical and mechanical properties, as well as notable resistance to yellowing compared to conventional commercial chrome-free tanning agents like TWS and F-90. Overall, this research emphasizes the efficacy of natural cyclodextrin materials as potent and environmentally friendly alternatives to chromium-based tanning agents, showcasing their significant potential in advancing sustainable and cleaner practices in leather production.
研究领域:
材料科学
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环境科学
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皮革化学
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产品关联
DOI
高影响因子
International Journal of Electrochemical Science
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2023
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IF 1.5
Yuhan Yao,Zhaolin Zhan,Jianxiong Liu,Xiao Wang,Xiaohua Yu,Ju Rong
Response surface methodology (RSM) was used in this study to determine the optimum operating conditions for the reduction of galvanized sheet corrosion using a Cr-free passivation films. Passivation films layer with strong corrosion resistance was formed on the surface of galvanizing which was impregnated in chromium-free passivating agent. Furthermore, the RSM was used to ascertain the main and interactive effects (deviation between the experimental and theoretical values: 0.12%). The coefficient of determination (R 2 ) showed that the RSM approach was appropriate for optimization of the Cr-free passivator. Silane coupling agent, ammonium molybdate, nanosilica, and tannic acid played a key role in changing the corrosion area and potential. The results revealed that, compared with Cr 6+ passivation, Cr-free passivation yielded considerably more homogeneous and smoother surfaces (surface roughness of Cr-free passivation film: 0.54 μm). In addition, the properties of the zinc coating after Cr- free passivation were clearly superior to those of the zinc coating subjected to the conventional Cr 6+ passivation treatment. E corr, current density, and polarization resistance values of this superior coating were -1073 mV, 0.017 A cm -2 , and 989.2 Q, respectively. This study can serve as an experimental and a theoretical guide for the development of Cr-free passivation films.
研究领域:
材料科学
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电化学
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表面工程
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产品关联
DOI
PubMed
高影响因子
POLYMER
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2025
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IF 4.5
Yuanhang Xiao,Yixuan Wang,Keshuai Ren,Chunhua Wang,Jun Sang,Mingjun Ma,Liang Ma,Wei Lin
Amphoteric polymers as leather retanning agents are considered to effectively address the charge imbalance between chrome-free tanned leather and common anionic wet finishing materials, and improve the quality of finished leather. However, the currently existed high chemical dosage and tedious wet finishing process associated with chrome-free tanning inevitably lead to high pollution emission and energy consumption. Herein, an amphoteric acrylic polymer (i.e., AARFA) with retanning and fatliquoring functions was prepared by free radical polymerization, which exhibited broad molecular weight (10−100 kDa) and appropriate particle size (∼200 nm). Molecular dynamics simulations and experiments showed that AARFA exhibited good dispersion in water and its aggregation behavior can be modulated by adjusting pH. We then applied AARFA in the rapid and reduced wet finishing process (RRWF) for two kinds of typical chrome-free tanned leather. Compared with conventional wet finishing (CWF) process (i.e., 10 % retanning agents and 10 % fatliquor), 12 % AARFA afforded leather dispersed collagen fibers, improved physical and sensory properties, and excellent dyeing performance. The RRWF process can effectively save work time by ∼31 %, reduce chemical consumption by ∼35 % and exhibit better wastewater degradability. Our developed RRWF process offer the promise for the chrome-free leather manufacturing towards low energy consumption and less carbon emissions.
研究领域:
材料科学
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环境科学
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皮革化学与工程
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产品关联
DOI
高影响因子
Journal of Cleaner Production
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2022
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IF 11.072
Jie Chen,Jianzhong Ma,Qianqian Fan,Wenbo Zhang
Chrome-free tanning agent is of great significance because it can eliminate the notable environmental pollution of chrome tanning. Metal-organic frameworks (MOFs) are the products of the desired combination of metal ions and organic ligands, which make them the born self-masking tanning agent. Herein, a series of Zr-MOFs were prepared by a solvothermal method, and then applied in leather tanning process. Among the Zr-MOFs family, UiO-66 tanned leather exhibited the highest shrinkage temperature ( T s ) of 75.3 °C. Meanwhile, the smaller particle size and self-masking structure of Zr-MOFs allowed for the uniform distribution in collagen fibers matrix, thus giving improved physical-mechanical and organoleptic properties . It was noted that 80% metal usage reduced could be achieved with Zr-MOF as tanning agent comparing with conventional zirconium sulfate. It was found that Zr 4+ of Zr-MOFs could mainly coordinate with -COOH and -NH 2 groups in collagen fibers to form a stable cross-linked structure. In addition, the BOD 5 /COD value (>0.3) of Zr-MOF tanning waste liquor indicated good biodegradability , further confirming the eco-friendly metal-less tanning process. All results indicate that the proposed Zr-MOFs will promote the eco-friendly metal-less tanning process and open a new chapter for the chrome-free tannage.
研究领域:
皮革化学与工程
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环境科学
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产品关联
DOI
高影响因子
GREEN CHEMISTRY
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2022
·Vol. 24
·期 9
·3750-3758
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IF 11.034
Wei Ding,Javier Remón,Zhicheng Jiang
High-profile chrome (Cr) pollution from tanning and potential health hazards from released leather dyes and pigments from leather products restrict the sustainable development of the leather industry. Herein, we report on a novel ‘Two Birds with One Stone’ strategy to simultaneously eliminate Cr and colorant pollutions using a Cr-free tanning agent with an in situ dyeing ability. Sucralose, containing an electron-withdrawing group (–Cl), was employed to fabricate a biomass-derived aldehyde tanning agent with in situ dyeing properties (BAT-iDP). This agent formed Schiff-base crosslinks between its aldehyde groups and the amino groups of collagen fibers (CFs), which efficiently dispersed and fixed the CFs, producing tanned leather with sufficient thermal stability (80.2 °C of shrinkage temperature) to meet commercial requirements. Simultaneously, the presence of an auxochrome (–Cl) in the structure of the Schiff-bases formed endowed the tanned leather with a brown color characteristic of leather. As a result, the tanned leather produced with our ‘Two Birds with One Stone’ strategy had excellent dyeing uniformity, color fastness to dry-wet rubbing and favorable mechanical strengths (14.7 N mm−2 of tensile strength and 46.3 N mm−1 of tear strength). This novel approach provides new insights for designing and developing multifunctional sustainable materials towards a greener and carbon-neutral leather industry.
研究领域:
材料科学
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环境科学
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皮革化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）