Journal of The American Leather Chemists Association最新文献_第8页

Biocolorant for Leather Dyeing Applications: An Eco-benign Evaluation of Natural Coloring Agent 皮革染色用生物着色剂:天然着色剂的生态评价

IF 0.9 4区工程技术

Journal of The American Leather Chemists Association Pub Date : 2021-09-07 DOI: 10.34314/jalca.v116i9.4397

C. Kurinjimalar, G. Jayakumar, A. Selvi, R. Venba, Malathy Jawhar, S. Kanth

{"title":"Biocolorant for Leather Dyeing Applications: An Eco-benign Evaluation of Natural Coloring Agent","authors":"C. Kurinjimalar, G. Jayakumar, A. Selvi, R. Venba, Malathy Jawhar, S. Kanth","doi":"10.34314/jalca.v116i9.4397","DOIUrl":"https://doi.org/10.34314/jalca.v116i9.4397","url":null,"abstract":"Exploration of biocolorant in leather industry is explored widely owing to its environmental limitation. Besides, employing synthetic dyes in leather process requires high end of pipe treatment due to their complex chemical structure. Therefore, an attempt has been made on exploiting madder root dye (Rubia cordifolia L.) for leather dyeing application. The effect of varying pretreatment regimen on madder colorant extraction, chemical characterizations (including UV-Vis, IR, particle size, zeta potential value, and thermal studies) and optimum operating leather dyeing conditions are studied. The results revealed dissolving medium pH 5, 100oC, and 60 min duration of extraction is optimum. Thus, obtained dye characteristics showed maximum absorption peak at 460 nm, with an average particle size of 166 nm. It also shows a negative zeta potential value of -5.31 which is indicative for dyeing application. The optimum leather dyeing is found at leather pH 5.5, 10% dye concentration and 4 h duration. At optimum dyeing parameters it shows good fastness, perspiration, organoleptic properties without affecting the physical characteristic. Novelty of the present research would lead to develop eco-dyeing method in leather manufacture. Moreover, the study unravels a new application of eco-benign dye to achieve sustainable process. ","PeriodicalId":17201,"journal":{"name":"Journal of The American Leather Chemists Association","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2021-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75994013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Hydrogen Peroxide-oxidized Soybean Polysaccharides as Novel Masking Agents for Zirconium Tanning 过氧化氢氧化大豆多糖作为新型锆鞣掩蔽剂的研究

IF 0.9 4区工程技术

Journal of The American Leather Chemists Association Pub Date : 2021-09-07 DOI: 10.34314/jalca.v116i7.4337

Haolin Zhu, Fang-Fang Wang, K. Tang, Jie Liu, Xuejing Zheng, S. Qin

{"title":"Hydrogen Peroxide-oxidized Soybean Polysaccharides as Novel Masking Agents for Zirconium Tanning","authors":"Haolin Zhu, Fang-Fang Wang, K. Tang, Jie Liu, Xuejing Zheng, S. Qin","doi":"10.34314/jalca.v116i7.4337","DOIUrl":"https://doi.org/10.34314/jalca.v116i7.4337","url":null,"abstract":"A series of hydrogen peroxide-oxidized soybean polysaccharides (HPS) were prepared using H2O2 and copper catalyst, which were then used as novel masking agents for zirconium tanning. The HPS samples were characterized by Fourier transforms infrared (FT-IR) spectroscopy, dynamic light scattering (DLS), and X-ray diffraction (XRD). FT-IR suggested the formation of carbonyl and carboxyl groups after hydrogen peroxide oxidation. DLS indicated that the HPS particle size decreases with increasing the H2O2 dosage. HPS with carbonyl and carboxyl groups and medium particle size was able to coordinate with zirconium to remarkably facilitate the tanning process. The shrinkage temperature of the tanned leather reached 92oC. Meanwhile, the fullness, softness, and mechanical properties of the leather were greatly improved by the tanning. The function of HPS and its interaction with zirconium were studied by FT-IR, XRD, and it was found that the triple helical structures of collagen fiber were not changed greatly. Scanning electron microscopy (SEM) showed that collagen fibers were dispersed and tanning agents were evenly distributed in collagen fibers. A new strategy for chromefree tanning is suggested and a strong support for the application of zirconium tanning is provided.","PeriodicalId":17201,"journal":{"name":"Journal of The American Leather Chemists Association","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2021-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76444913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

A Comprehensive Understanding on Sewability of Natural Biomaterial: An Insight on Process Optimization during Leather Manufacture 对天然生物材料缝性的全面理解:对皮革制造过程优化的洞察

IF 0.9 4区工程技术

Journal of The American Leather Chemists Association Pub Date : 2021-09-07 DOI: 10.34314/jalca.v116i7.4334

G. Jayakumar, K. P. Aaron, K. Krishnaraj

引用次数: 0

Preparation and Properties of Thermally Expandable Microspheres for Foam Coating 泡沫涂料用热膨胀微球的制备及性能研究

IF 0.9 4区工程技术

Journal of The American Leather Chemists Association Pub Date : 2021-09-07 DOI: 10.34314/jalca.v116i7.4336

Guodong Huang, Zhi-Ru Lin, H. Fan, Jun Xiang, C. Zheng, Luo Zhiqing

引用次数: 0

Study on the Dry-Cleaning Process of Mink Fur Based on Subcritical Solvent 基于亚临界溶剂的水貂毛皮干洗工艺研究

IF 0.9 4区工程技术

Journal of The American Leather Chemists Association Pub Date : 2021-09-07 DOI: 10.34314/jalca.v116i9.4399

Yingxuan Wang, Qiaoping Xia, Qiang Liu, H. Dai, Zongcai Zhang

引用次数: 1

Polyurethane Electrospun Fiber Biomimetics Membrane for Constructing the Structure of Grain Layer with Good Breathability for Cattle Split Leather 构建透气性好的牛皮颗粒层结构的聚氨酯静电纺纤维仿生膜

IF 0.9 4区工程技术

Journal of The American Leather Chemists Association Pub Date : 2021-08-02 DOI: 10.34314/jalca.v116i8.4358

Nan Chen, Yanchun Li, Jianbo Qu, Jianyong Wang

{"title":"Polyurethane Electrospun Fiber Biomimetics Membrane for Constructing the Structure of Grain Layer with Good Breathability for Cattle Split Leather","authors":"Nan Chen, Yanchun Li, Jianbo Qu, Jianyong Wang","doi":"10.34314/jalca.v116i8.4358","DOIUrl":"https://doi.org/10.34314/jalca.v116i8.4358","url":null,"abstract":"The traditional thick coating on split leather does not have the ability to breathe like full grain leather. The air and water vapor permeabilities of full grain leather are well known properties due to its fiber woven structure. Simulating the fiber morphology and weaving structure of the dermis or grain layer is very important to construct a top surface layer for split leather. In this paper, a PU (polyurethane) foam layer is put first on the split to enhance the adhesion of a second application of a superfine fibrous PU resin. This foam uses well-known waterborne polyurethane foaming technology. This dried foam has good breathability because of high porosity. A superfine fiber membrane is next put atop of the foam layer by using an electro-spun polyurethane resin. This second resin imitates collagen fibers in the network structure of the leathers’ grain layer. Thus, this resultant electrospun fiber biomimetics membrane simulated the grain layer of natural leather. SEM showed the morphology and structure of this electrospun fiber biomimetic membrane to be like that of the grain layer of natural leather. The porosity and apparent density were basically the same as the grain of leather, which were 63.65% and 583.878 kg/m3 respectively. The air and water vapor permeability of the biomimetics membrane were also as high as 2250 mL·cm-2·h-1 and 8753.02 μg·cm-2·h-1 respectively. Therefore, the biomimetics membrane largely restored the ability to breathe of split leather. Thus, this method simulates the performance and structure of full grain leather and is a novel method for industrial production","PeriodicalId":17201,"journal":{"name":"Journal of The American Leather Chemists Association","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2021-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85670468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development of a Headspace-Solid Phase Micro Extraction Method for the Analysis of Volatile and Semi-Volatile Organic Compounds from Polyurethane Resins for Leather Finishing 顶空-固相微萃取法分析皮革整理用聚氨酯树脂中挥发性和半挥发性有机化合物的研究

IF 0.9 4区工程技术

Journal of The American Leather Chemists Association Pub Date : 2021-08-02 DOI: 10.34314/jalca.v116i8.4362

A. Flores, S. Sorolla, C. Casas, R. Cuadros, Anna Bacardit

{"title":"Development of a Headspace-Solid Phase Micro Extraction Method for the Analysis of Volatile and Semi-Volatile Organic Compounds from Polyurethane Resins for Leather Finishing","authors":"A. Flores, S. Sorolla, C. Casas, R. Cuadros, Anna Bacardit","doi":"10.34314/jalca.v116i8.4362","DOIUrl":"https://doi.org/10.34314/jalca.v116i8.4362","url":null,"abstract":"Volatile organic compounds (VOCs) and Semi-Volatile Organic Compounds (SVOCs) arise from the chemicals used in the various stages of the leather manufacturing process. An important aim of the tanning industry is to minimize or eliminate VOCs and SVOCs, without lowering the quality of leather. \u0000This paper shows the development of a new headspace-solid phase micro extraction coupled with gas chromatography–mass spectrometry (HS-SPME/GC-MS) method for the identification of VOCs and SVOCs emitted by newly designed polymers for the leather finishing operation. These new polymers are polyurethane resins designed to reduce the VOC and SVOC concentration. This method enables a simple and fast determination of the qualitative and semi-quantitative content of VOCs and SVOCs in polyurethane-type finishing resins. The chemicals that are of concern in this paper are the following: Dipropylene glycol Monomethyl Ether (DPGME), DBE-3 (a mixture of dibasic esters) and Triethylamine (TEA). The test conditions that have been determined to carry out the HS-SPME assay are the following: incubation time (2 hours), extraction temperature and time (40°C; 5 minutes) and the desorption conditions (280°C, 50 seconds). \u0000Ten samples of laboratory scale resins were tested by HS-SPME followed by gas chromatography (GC-MS). DPGME and DBE-3 (a mixture of dimethyl adipate, dimethyl glutarate and dimethyl succinate) have been identified effectively. The compounds are identified by a quantitative method using external calibration curves for the target compounds. The technique is not effective to determine the TEA compound, since the chromatograms shown poor resolution peaks for the standard. ","PeriodicalId":17201,"journal":{"name":"Journal of The American Leather Chemists Association","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2021-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73568988","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Tanning Performance of a Novel Chrome-Free Complex Tanning Agent: Penetration and Distribution 一种新型无铬复合鞣剂的鞣性能:渗透与分布

IF 0.9 4区工程技术

Journal of The American Leather Chemists Association Pub Date : 2021-08-02 DOI: 10.34314/jalca.v116i8.4356

Zhen Wang, Ya-nan Wang, Yue Yu, B. Shi

引用次数: 2

Research on Sheepskin Contour Extraction Method Based on Computer Vision Measurement Technology 基于计算机视觉测量技术的羊皮轮廓提取方法研究

IF 0.9 4区工程技术

Journal of The American Leather Chemists Association Pub Date : 2021-08-02 DOI: 10.34314/jalca.v116i8.4355

Hu Lianhua, Xiang Chengyi, Z. Feng

{"title":"Research on Sheepskin Contour Extraction Method Based on Computer Vision Measurement Technology","authors":"Hu Lianhua, Xiang Chengyi, Z. Feng","doi":"10.34314/jalca.v116i8.4355","DOIUrl":"https://doi.org/10.34314/jalca.v116i8.4355","url":null,"abstract":"Manual trimming of sheepskin is intensive labor, and the working environment is full of rotten smells. The tannery is facing increasingly severe recruitment difficulties. This paper uses computer vision technology to study automatic recognition of sheepskin contours, which is the basis for the subsequent automatic trimming of sheepskin. After observing and analyzing the raw sheepskin images collected by an industrial array camera, a method of sheepskin contour extraction based on computer vision measurement technology is proposed in this paper. This method uses the fast Otsu threshold algorithm based on the pixel set to perform binary image segmentation. Combined with morphological processing for edge defect filling and topology analysis of boundary contour tracking algorithm to extract maximum contour information, it has a pixel-level three-dimensional de-noising preprocessing function and can accurately extract the sheepskin contour in the raw sheepskin image. The experimental results show that using the fast Otsu threshold algorithm proposed in this paper for binary segmentation to extract sheepskin contours, the detection rate is nearly 160% faster than the traditional Otsu algorithm, the edge protection is better, the error segmentation is reduced by nearly 3% and it has good anti-noise performance. It can meet the industrial production requirements of subsequent automatic cutting of sheepskin.","PeriodicalId":17201,"journal":{"name":"Journal of The American Leather Chemists Association","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2021-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84358578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Development of Improved Liming Process based on Automated pH Monitoring and Control System 基于pH自动化监测与控制系统的改良石灰化工艺开发

IF 0.9 4区工程技术

Journal of The American Leather Chemists Association Pub Date : 2021-06-03 DOI: 10.34314/jalca.v116i6.4309

N. Vedaraman, K. Srinivas, D. Krishnamoorthy, V. Aparna, V. Anand, A. Raj, M. A. Javid, C. Muralidharan, J. Sundar, K. Iyappan, K. C. Velappan

{"title":"Development of Improved Liming Process based on Automated pH Monitoring and Control System","authors":"N. Vedaraman, K. Srinivas, D. Krishnamoorthy, V. Aparna, V. Anand, A. Raj, M. A. Javid, C. Muralidharan, J. Sundar, K. Iyappan, K. C. Velappan","doi":"10.34314/jalca.v116i6.4309","DOIUrl":"https://doi.org/10.34314/jalca.v116i6.4309","url":null,"abstract":"The control of pH of a process plays an important role in many chemical or biological reactions. The monitoring and control of pH of processes like wastewater treatment, manufacturing food and leather making facilitate to reduce pollution and improve the quality of the final product. The focus of this study is to optimize the usage of lime and recycling of spent liquor through continuous monitoring system of pH to achieve near zero residue from liming operation. But the challenges are nonlinear behaviour of the system and frequent fouling of pH sensors. The system developed monitors the pH values and controls the cycling time and the addition of lime as per the user set profile. The real time data of pH values in the process is logged on to the PC for further analysis. The efficacy of the system developed was validated at lab level and can be easily scaled up for implementation in industries. The results showed that the effluent from leather making can be minimized by adopting automated pH monitoring and control systems.","PeriodicalId":17201,"journal":{"name":"Journal of The American Leather Chemists Association","volume":null,"pages":null},"PeriodicalIF":0.9,"publicationDate":"2021-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83495117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0