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Fluorescent Tracing of Dialdehyde Sodium Alginate Tanning Agent in Leather Matrix 荧光追踪皮革基质中的海藻酸钠二醛鞣剂
IF 0.9 4区 工程技术 Q3 Chemistry Pub Date : 2023-09-01 DOI: 10.34314/jalca.v118i9.8189
Min Zhu, Yudan Yi, Jia Fu, Yunhang Zeng, Ya-nan Wang
Dialdehyde polysaccharides possess a sustainable nature and good tanning performance. However, the lack of specific detectable groups in their molecular structure results in the difficulty in the determination of the location of dialdehyde polysaccharides in leather fiber networks. In this study, dialdehyde sodium alginate (DSA) tanning agent was fluorescent labeled by 5-(4,6-dichlorotriazinyl) aminofluorescein (DTAF). The purified DTAF–DSA showed high and stable fluorescent intensity at emission wavelength of 515.2 nm when the pH was over 6.0, and the temperature was in the range of 20°C to 50°C. DTAF–DSA was used in tanning and tracked using fluorescence microscopy. Its penetration in the fiber network could be clearly visualized, and its distribution in leather differed with the molecular weight of DSA. As a result, this fluorescence tracing technique could display the mass transfer behavior of dialdehyde polysaccharide tanning agents in leather matrix, which will provide underlying data for tanning mechanism exploration.
二醛多糖具有可持续性和良好的鞣制性能。然而,由于其分子结构中缺乏特定的可检测基团,因此很难确定二醛多糖在皮革纤维网中的位置。在这项研究中,用 5-(4,6-二氯三嗪基)氨基荧光素(DTAF)对二醛海藻酸钠(DSA)鞣剂进行了荧光标记。纯化后的 DTAF-DSA 在 pH 值超过 6.0,温度在 20°C 至 50°C 之间时,在 515.2 nm 的发射波长处显示出较高且稳定的荧光强度。DTAF-DSA 被用于鞣制,并利用荧光显微镜进行跟踪。它在纤维网络中的渗透情况清晰可见,其在皮革中的分布随 DSA 的分子量而不同。因此,这种荧光追踪技术可以显示二醛多糖鞣剂在皮革基质中的传质行为,为探索鞣制机理提供基础数据。
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引用次数: 0
Resource Utilization of Bovine Hair Recycling from Enzymatic Unhairing during Leather Manufacturing 皮革生产过程中酶解牛毛回收的资源利用
IF 0.9 4区 工程技术 Q3 Chemistry Pub Date : 2023-09-01 DOI: 10.34314/jalca.v118i9.8190
Ting Liu, Chunxiao Zhang, Xu Zhang, B. Peng, Mengchu Gao
With the development of enzymatic unhairing technology in the leather industry, enhancing the recycling of bovine hair is a new issue emerging in leather-making. In this work, the effects of alkali concentration, time, and temperature in the pretreatment, as well as enzyme dosage, time, temperature, and pH in the following treatment on the dissolution performance and keratin yield of bovine hair were investigated. Hence, the extraction process of keratin from bovine hair by the alkali-enzyme method was optimized. The results sho that the optimal conditions for the keratin extraction are as follows: for the pretreatment with alkali, the alkali concentration is 0.4 M, the pretreatment time is 1.0 h, the pretreatment temperature is 65°C, and for the following enzymatic treatment, the enzyme dosage is 3324 U/g bovine hair, the action time is 4.0 h, action temperature is 45°C, and the pH is controlled between 8.5-11.5. Compared with the alkali method, the alkali-enzyme method increases the keratin yield from 24.4% to 58.1%, and the alkali dosage is reduced by 50%. The prepared keratin had high in vitro antioxidant activity, which provided a new idea for the resource utilization of bovine hair waste.
随着酶解牛毛技术在皮革工业中的发展,提高牛毛的回收利用率成为制革业中出现的一个新问题。在这项工作中,研究了预处理中碱的浓度、时间和温度,以及后续处理中酶的用量、时间、温度和 pH 值对牛毛溶解性能和角蛋白产量的影响。因此,对碱性酶法提取牛毛角蛋白的工艺进行了优化。结果表明,角蛋白提取的最佳条件为:碱预处理时,碱浓度为0.4 M,预处理时间为1.0 h,预处理温度为65℃;酶处理时,酶用量为3324 U/g牛毛,作用时间为4.0 h,作用温度为45℃,pH值控制在8.5-11.5之间。与碱法相比,碱-酶法的角蛋白得率从 24.4% 提高到 58.1%,碱用量减少了 50%。制备的角蛋白具有较高的体外抗氧化活性,为牛毛废弃物的资源化利用提供了新思路。
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引用次数: 0
Investigation of High Penetration and Dispersion of Functional Nanoparticles in Leather 功能纳米粒子在皮革中的高渗透性和分散性研究
IF 0.9 4区 工程技术 Q3 Chemistry Pub Date : 2023-09-01 DOI: 10.34314/jalca.v118i9.8192
Ji-bo Zhou, Nan Sun, Xue-pin Liao, Bi Shi
The use of nanoparticle-based functional leather products has stimulated sustainable growth of the conventional leather industry. However, functional nanoparticles (FNPs) face challenges to be well penetrated and dispersed in leather because of their aggregation and mismatch charges with leather. In this study, the acrylic resin (AR) retanning agent, which was originally utilized in leather processing, was applied for the modification of FNPs. It has been demonstrated that AR can improve the electrostatic and steric repulsion among nanoparticles, inhibiting their aggregation and ensuring their penetration and dispersion in leather. Because of the limitation of leather porosity, the maximum loading amount for FNPs was about 40wt% (based on leather weight). The leather got higher results in fullness, thickening ratio, and tensile strength when the loading amount of FNPs was 11.25%. Moreover, the proposed approach in this study can be used well for other types of FNPs loaded in leather, suggesting its broad applicability.
基于纳米粒子的功能性皮革产品的使用刺激了传统皮革业的可持续增长。然而,功能纳米粒子(FNPs)由于其聚集性和与皮革的电荷不匹配性,在皮革中的良好渗透和分散面临着挑战。本研究将原本用于皮革加工的丙烯酸树脂(AR)复鞣剂用于改性 FNPs。研究表明,AR 可以改善纳米粒子之间的静电和立体排斥,抑制其聚集,确保其在皮革中的渗透和分散。由于皮革孔隙率的限制,FNPs 的最大负载量约为 40wt%(基于皮革重量)。当 FNPs 的添加量为 11.25% 时,皮革的丰满度、增厚率和拉伸强度都得到了提高。此外,本研究提出的方法还可用于皮革中添加其他类型的 FNPs,这表明它具有广泛的适用性。
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引用次数: 0
Study on the Pyrolysis Kinetic Behaviors of Different Vegetable-Tanned Sheepskin Leathers 不同植物鞣羊皮的热解动力学行为研究
IF 0.9 4区 工程技术 Q3 Chemistry Pub Date : 2023-08-01 DOI: 10.34314/jalca.v118i8.8089
Chaoya Ren, Jie Liu, Fang Wang, Yong Lei, Madalina Georgiana Albu Kaya, Keyong Tang
The pyrolysis behaviors of leathers tanned with hydrolyzable tannins (Tara and Chestnut extracts), and condensed tannins (Quebracho and Mimosa extract) were studied by Thermogravimetric (TG) analysis in the present work. The TG/derivative thermogravimetry (DTG) results showed that the thermal stability of Tara- and Chestnut-tanned samples is poorer than that of Quebracho- and Mimosa-tanned ones. In order to study pyrolysis kinetics, TG experiments at different heating rates were carried out. Two methods of Flynn-Wall-Ozawa (FWO) and Friedman (FR) were employed to calculate the pyrolysis activation energy (Eα) of the samples. It was found that the average Eα of the vegetable-tanned samples is located at the range of 191.7-206.1 kJ/mol. The thermodynamic parameters (pre-exponential factor, Gibbs free energy, enthalpy, and entropy) of the samples were subsequently calculated based on the average Eα by the FR method. The Gibbs free energies of the Chestnut-, Tara-, Quebracho-, and Mimosa-tanned leathers were 176.9 kJ/mol, 179.8 kJ/mol, 179.3 kJ/mol, and 178.2 kJ/mol, respectively. The difference between the average enthalpies and the Eα is less than 5 kJ/mol, which indicated that the pyrolysis process is conductive to the product formation. The mean entropy (ΔS) of the four vegetable-tanned samples is all positive, which suggested that the pyrolysis of the samples could easily take place. This work might provide theoretical guidance for the optimization of vegetable-tanned leather waste pyrolysis.
本研究通过热重(TG)分析法研究了使用可水解单宁(塔拉和栗木提取物)和缩合单宁(坚木和含羞草提取物)鞣制的皮革的热解行为。热重/衍生热重分析(DTG)结果表明,塔拉和栗木鞣制样品的热稳定性比坚木和含羞草鞣制样品差。为了研究热解动力学,在不同加热速率下进行了热重分析实验。采用 Flynn-Wall-Ozawa (FWO) 和 Friedman (FR) 两种方法计算样品的热解活化能(Eα)。结果发现,植鞣革样品的平均 Eα 位于 191.7-206.1 kJ/mol 的范围内。随后,根据平均 Eα 用 FR 方法计算了样品的热力学参数(前指数因子、吉布斯自由能、焓和熵)。栗木鞣革、塔拉鞣革、栲胶鞣革和含羞草鞣革的吉布斯自由能分别为 176.9 kJ/mol、179.8 kJ/mol、179.3 kJ/mol 和 178.2 kJ/mol。平均焓与 Eα 之间的差值小于 5 kJ/mol,这表明热解过程有利于产物的形成。四种植物鞣革样品的平均熵(ΔS)均为正值,这表明样品很容易发生热解。这项研究可为优化植鞣革废料热解提供理论指导。
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引用次数: 0
Impact of Flax Seed Protein and Beeswax Emulsion Blend on Leather Finishing– A Novel Eco-Benign Formulation 亚麻籽蛋白和蜂蜡乳液混合物对皮革涂饰的影响--一种新型生态良性配方
IF 0.9 4区 工程技术 Q3 Chemistry Pub Date : 2023-08-01 DOI: 10.34314/jalca.v118i8.8091
B. Sahu, Janani V, Renganath Rao R, Akash Bhalla, M. A. Javid
Protein based finishing on leather surface is generally done using casein-based formulation which forms a transparent and breathable film. Other naturally available options such as protein extracted from flax seeds exhibit versatile application in various fields. Thus in this work, the flax seed protein which is found to be 84%, along with bees wax emulsion is explored for the first time as an Eco benign binder and as an alternative for casein based finish. The binders play very important role in leather finishing as it helps in binding the various constituents of finishing such as pigments, wax, and additives to the leather matrix. The prepared Eco benign binder formed a continuous film on the surface of the leather and improved the of physical properties and crack resistance of the leather. The FTIR and particle size analysis were carried out for the characterization of the Eco benign binder. The experimental leathers were tested for tensile strength, elongation at break, lastometer test, colour fastness and cold crack tests. The results of the said tests were satisfied and on par with control leathers.
基于蛋白质的皮革表面涂饰一般使用酪蛋白配方,这种配方能形成一层透明透气的薄膜。从亚麻籽中提取的蛋白质等其他天然物质在不同领域有着广泛的应用。因此,在这项工作中,我们首次将亚麻籽蛋白(含量高达 84%)与蜂蜡乳液一起作为一种环保型粘合剂和酪蛋白涂饰剂的替代品进行了研究。粘合剂在皮革涂饰中起着非常重要的作用,因为它有助于将各种涂饰成分(如颜料、蜡和添加剂)粘合到皮革基体上。所制备的生态良性粘合剂在皮革表面形成了一层连续的薄膜,提高了皮革的物理性能和抗裂性。傅立叶变换红外光谱和粒度分析用于表征生态良性粘合剂。对实验皮革进行了拉伸强度、断裂伸长率、楦度测试、色牢度和冷裂测试。上述测试结果令人满意,与对照皮革相当。
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引用次数: 0
Study on Interaction Mechanism between Neutral Salts and Collagen by Combining Experiments with Molecular Dynamics Simulation 通过实验与分子动力学模拟相结合研究中性盐与胶原蛋白的相互作用机理
IF 0.9 4区 工程技术 Q3 Chemistry Pub Date : 2023-07-03 DOI: 10.34314/jalca.v118i7.7855
Min Gu, Xiaoxia Zhang, Yuanzhi Zhang, Songcheng Xu, Guoying Li
The effect of salt on the collagen of hide/skin is of great significance in leather-making. However, the interaction between neutral salts and collagen has not been clear, since the microscopic interaction is hard to be observed directly from the macro level of hide/skin collagen. In this study, the collagen solutions in the typical neutral salts (NaCl, CaCl2, and Na2SO4) systems were used to explore the interaction mechanism between neutral salts and collagen via combining experiments with molecular dynamics (MD) simulation. The results of fluorescence measurements of pyrene, dynamic light scattering, atomic force microscopy, and isoelectric point suggested that the variation of the interaction between different neutral salts and collagen was accompanied with the changes in physicochemical properties of collagen. MD simulation further revealed more detailed information on the interaction mechanism between neutral salts and collagen at the molecular level. The computational results of non-bond energy of the collagen-salt model boxes indicated that the electrostatic interactions of different salts with collagen molecules had the order of CaCl2> Na2SO4> NaCl. The analyses of the visualized conformation and the radial distribution functions showed that CaCl2 with Ca2+ as contributing ion tended to form intramolecular salt bridges with collagen, while Na2SO4 with SO42-as contributing ion more likely formed salt bridges between collagen molecules in the shape of agglomerates. In contrast, NaCl with Cl-as contributing ion was scattered around the collagen models, and its effect on collagen was much smaller. The study elaborated the interaction mechanism of typical neutral salts and collagen to be helpful for further understanding and improving the use of neutral salts in many steps involved in leather production.
盐对皮革胶原蛋白的影响在皮革制造中具有重要意义。然而,中性盐与胶原蛋白之间的相互作用尚不明确,因为从宏观上很难直接观察到皮革胶原蛋白的微观相互作用。本研究采用典型的中性盐(NaCl、CaCl2 和 Na2SO4)体系中的胶原蛋白溶液,通过实验与分子动力学(MD)模拟相结合的方法,探索中性盐与胶原蛋白之间的相互作用机理。芘荧光测量、动态光散射、原子力显微镜和等电点的结果表明,不同中性盐与胶原蛋白相互作用的变化伴随着胶原蛋白理化性质的变化。MD 模拟进一步揭示了中性盐与胶原蛋白在分子水平上相互作用机制的详细信息。胶原蛋白-盐模型盒的非键能计算结果表明,不同盐类与胶原蛋白分子的静电相互作用顺序为 CaCl2> Na2SO4> NaCl。对可视化构象和径向分布函数的分析表明,以 Ca2+ 为离子的 CaCl2 更倾向于与胶原蛋白形成分子内盐桥,而以 SO42 为离子的 Na2SO4 更有可能在胶原蛋白分子之间形成团块状盐桥。相比之下,以 Cl- 为离子的 NaCl 则分散在胶原模型周围,对胶原的影响要小得多。该研究阐述了典型中性盐与胶原蛋白的相互作用机理,有助于进一步了解和改进中性盐在皮革生产多个步骤中的应用。
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引用次数: 0
Tanning with Pomegranate Peel Tannin 用石榴皮单宁美黑
IF 0.9 4区 工程技术 Q3 Chemistry Pub Date : 2023-07-03 DOI: 10.34314/jalca.v118i7.7860
Cigdem Ozkan
By-products of pomegranate juice enterprises are evaluated as a “green” raw material for many industries. In this study, pomegranate peels which are well known with high polyphenolic content were evaluated as a potential source of tanning agent for leather industry. For this purpose, firstly pomegranate peels were extracted in Koch extractor at 70°C for 8 hours. In order to determine the tanning ability, 30% of ground pomegranate peel powder (containing 7.2% of active tannin matter) was used in the tanning process and pomegranate peel tanned leather was evaluated in terms of increases in thickness and shrinkage temperature, color change and mechanical properties. The application of pomegranate peel tannin in the tanning process provided that an acceptable shrinkage temperature (68.5°C) and mechanical properties for vegetable tanned leathers. The results revealed that the tannin obtained from pomegranate peel has a remarkable tanning effect and can be used in the tanning process. Thus, it is concluded that pomegranate peels can be evaluated as a new source of tannin for leather industry.
石榴汁企业的副产品被许多行业视为 "绿色 "原料。在这项研究中,众所周知石榴皮具有很高的多酚含量,因此将其作为一种潜在的皮革工业鞣剂来源进行评估。为此,首先用 Koch 萃取器在 70°C 下萃取石榴皮 8 小时。为了确定石榴皮的鞣制能力,在鞣制过程中使用了 30% 的石榴皮粉末(含有 7.2% 的活性单宁物质),并对石榴皮鞣制皮革的厚度增加、收缩温度、颜色变化和机械性能进行了评估。石榴皮单宁在鞣制过程中的应用为植物鞣革提供了可接受的收缩温度(68.5°C)和机械性能。研究结果表明,从石榴皮中提取的单宁具有显著的鞣革效果,可用于鞣革工艺。因此,可以将石榴皮作为皮革工业的一种新单宁来源进行评估。
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引用次数: 0
Region Wise Surface Level Defect Detection and Ranking of Crust Leather Images Based on Image Processing Techniques 基于图像处理技术的区域表面缺陷检测和结壳皮革图像分级
IF 0.9 4区 工程技术 Q3 Chemistry Pub Date : 2023-07-03 DOI: 10.34314/jalca.v118i7.7856
S. Vasagam, M. Sornam
Sorting and aligning of crust leather for grading on position wise defect distribution is one of the methods adopted in the tanning industry. This method is generally carried out manually by a veteran on official sampling position and their input is critical because it is directly linked to sales of the crust leather. The opinion of the experts is believed to be stable and consumes a good amount of time too. Hence, in the current research a robust defect detection method and ranking of crust leather images based on image processing techniques is proposed to give a stable solution in a short span of time. A custom-made dataset of crust leather images consisting of 5640 images were used in this study. The pixel intensity has been extracted on demarcated position of various regions including neck, belly left, belly right, center and butt instead of official sampling position through horizontal and vertical mapping of coordinates with a new method Grading Score on Image Position wise (GSIP) on the actual images. The image processing techniques using Canny Edge Detection and filters such as Laplacian, Median, Prewitt, Roberts, Sobel and Scharr were implemented to get the pixel intensity grouped and classified based on parameters within acceptable range using a Naïve Bayes Classifier. The classifier confirms that the accuracy of Set I - Actual Images and Set II - Defects with implementation of canny edge detection over other image processing techniques at 99.50%. Therefore, the current research confirms that the proposed GSIP method would give an additional tool to inspectors while ranking the crust leather based on region wise surface level defect detection of crust leather images based on image processing techniques.
鞣革行业采用的方法之一是对结皮进行分拣和对齐,以便根据缺陷分布情况进行分级。这种方法一般由官方取样位置上的资深专家手工操作,他们的意见至关重要,因为这直接关系到结皮的销售。专家的意见被认为是稳定的,而且会耗费大量时间。因此,在当前的研究中,提出了一种基于图像处理技术的稳健缺陷检测方法和结皮图像排序,以便在短时间内给出稳定的解决方案。本研究使用了一个定制的皮壳皮革图像数据集,该数据集由 5640 张图像组成。通过在实际图像上使用一种新方法--图像位置分级法(GSIP)--对坐标进行水平和垂直映射,提取了包括颈部、腹部左侧、腹部右侧、中心和臀部等不同区域的划界位置的像素强度,而不是官方采样位置。使用 Canny 边缘检测和滤波器(如拉普拉斯滤波器、中值滤波器、普雷维特滤波器、罗伯茨滤波器、索贝尔滤波器和沙尔滤波器)等图像处理技术,对像素强度进行分组,并使用奈伊夫贝叶斯分类器根据可接受范围内的参数进行分类。分类器证实,与其他图像处理技术相比,采用 canny 边缘检测技术的集合 I - 实际图像和集合 II - 缺陷的准确率为 99.50%。因此,目前的研究证实,基于图像处理技术对结皮图像进行区域表面缺陷检测时,拟议的 GSIP 方法将为检测人员提供额外的工具,对结皮进行分级。
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引用次数: 0
Isolation and Identification of Moderately Halophilic Bacteria from Soak Liquor Samples Collected of Leather Tanneries 从皮革制革厂采集的浸泡液样本中分离和鉴定中度嗜卤细菌
IF 0.9 4区 工程技术 Q3 Chemistry Pub Date : 2023-07-03 DOI: 10.34314/jalca.v118i7.7857
P. Caglayan
Isolation and identification of protease and lipase producing moderately halophilic bacteria from soak liquor samples and studying their adverse effects to the sheepskin using scanning electron microscopy may provide critical data on decomposition of raw hide/skin materials during soaking process. Moreover, enzyme-production properties of the moderately halophilic isolates (such as catalase, oxidase, lipase, protease, urease, caseinase, amylase, cellulase, pullulanase, xylanase) were determined. The effects of different NaCl concentrations, pH and temperature values on the growth of moderately halophilic bacterial isolates were tested. In the present study, four moderately halophilic bacterial isolates were isolated and selected for further experiments. The isolated species designated as SLMHB5, SLMHB10, SLMHB12, SLMHB13 were similar to Vibrio alginolyticus, Terribacillus halophilus, Vibrio alginolyticus, and Vibrio parahaemolyticus species, respectively. Scanning electron micrographs of sheepskin samples demonstrated that enzymatic activities of moderately halophilic bacteria isolated from soak liquor samples which decomposed the skin structure. After 35-days storage period, the sheepskin sample showed bad odor, sticky appearance and hair slip. Hence, it is recommended to control these microorganisms during the soaking process with an effective antimicrobial agent.
从浸泡液样本中分离和鉴定产生蛋白酶和脂肪酶的中度嗜卤细菌,并使用扫描电子显微镜研究它们对羊皮的不利影响,可提供有关浸泡过程中生皮/羊皮材料分解的关键数据。此外,还测定了中度嗜卤分离菌的产酶特性(如过氧化氢酶、氧化酶、脂肪酶、蛋白酶、脲酶、酪蛋白酶、淀粉酶、纤维素酶、纤维素酶、木聚糖酶)。测试了不同氯化钠浓度、pH 值和温度值对中度嗜卤细菌分离物生长的影响。本研究分离并选择了四种中度嗜卤细菌进行进一步实验。分离出的菌种被命名为 SLMHB5、SLMHB10、SLMHB12 和 SLMHB13,它们分别与藻溶弧菌、嗜卤特里巴氏菌、藻溶弧菌和副溶血性弧菌相似。羊皮样品的扫描电子显微照片显示,从浸泡液样品中分离出的中度嗜卤细菌具有分解羊皮结构的酶活性。贮存 35 天后,羊皮样品出现异味、外观发粘和毛发滑落。因此,建议在浸泡过程中使用有效的抗菌剂来控制这些微生物。
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引用次数: 0
Effect of Acid Swelling and Its Impact on the Properties of Cow Industrial Glove Leathers 酸膨胀效应及其对牛工业手套皮革性能的影响
IF 0.9 4区 工程技术 Q3 Chemistry Pub Date : 2023-06-01 DOI: 10.34314/jalca.v118i6.7657
M. Sathish, P. Thanikaivelan, Nayan Sarkar, R. Aravindhan, J. R. Rao
The development of commercially successful salt-free chrome tanning technology is the need of global leather sector to reduce the total dissolved solids in wastewater. Though some attempts have been made to develop salt-free chrome tanning technology, drawbacks such as slow diffusion of chromium, unevenness in softness and other organoleptic properties are the major concern. The generation of localized acid swelling might be a reason for the above drawbacks and no scientific literature available for the same. Hence, it is important to analyze the effect of acid swelling and its impact on the diffusion of chromium, ageing characteristics of wet-blue leather and physical properties of crust leather. The results show that the acid swelling delays the diffusion of chromium in tanning process and also enhances the growth marks on wet-blue leather. The ageing study reveals that the wet-blue obtained from acid swollen system dehydrates faster than the conventional salt based chromium tanning system. In addition, the wet-blue leather from acid swollen system is prone to fungal attack. The industrial glove leather obtained from acid swollen system has reduced strength characteristics viz., 15% reduction in tensile strength, 17% reduction in tear strength and 20% reduction in grain crack/bursting strength. Further, the degree of heterogeneity in softness is high for crust leather obtained from acid swollen system and also more looseness with internal emptiness. Color value measurements reveal that the crust leather obtained from the conventional tanning system is lighter in shade than the acid-swollen system. The results will be useful to design commercially viable salt-free or low-salt tanning systems as well as to tackle the inadvertent industrial scenario where the tanners are looking for solutions for accidental acid swelling and subsequent salvage of the leathers for possible recovery and applications.
开发商业上成功的无盐铬鞣技术是全球皮革行业减少废水中总溶解固体的需要。尽管人们已经尝试开发无盐铬鞣技术,但铬的缓慢扩散、柔软度不均匀和其他感官特性等缺点仍是人们关注的主要问题。局部酸膨胀的产生可能是造成上述缺点的一个原因,但目前还没有这方面的科学文献。因此,分析酸膨胀的效果及其对铬的扩散、蓝湿革的老化特性和结皮的物理性能的影响非常重要。结果表明,酸膨胀会延迟铬在鞣制过程中的扩散,同时也会增强蓝湿皮上的生长痕迹。老化研究表明,与传统的盐基铬鞣制体系相比,酸膨胀体系制得的蓝湿皮脱水速度更快。此外,酸性膨胀体系制得的蓝湿皮革容易受到真菌的侵袭。从酸性膨胀体系中获得的工业手套革的强度特性降低,即拉伸强度降低 15%,撕裂强度降低 17%,粒裂/爆破强度降低 20%。此外,从酸性膨胀体系中获得的头层革的柔软度异质性较高,而且更松软,内部更空虚。色值测量结果显示,传统鞣制体系制得的结皮色泽浅于酸性膨胀体系制得的结皮。这些结果将有助于设计商业上可行的无盐或低盐鞣制系统,也有助于解决制革工人在工业生产中无意中发现的酸膨胀问题,以及随后为可能的回收和应用而挽救皮革的问题。
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引用次数: 0
期刊
Journal of The American Leather Chemists Association
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