Effect of Acid Swelling and Its Impact on the Properties of Cow Industrial Glove Leathers

IF 0.6 4区 工程技术 Q4 CHEMISTRY, APPLIED
M. Sathish, P. Thanikaivelan, Nayan Sarkar, R. Aravindhan, J. R. Rao
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Abstract

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.
酸膨胀效应及其对牛工业手套皮革性能的影响
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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来源期刊
Journal of The American Leather Chemists Association
Journal of The American Leather Chemists Association 工程技术-材料科学:纺织
CiteScore
1.30
自引率
33.30%
发文量
29
审稿时长
3 months
期刊介绍: The Journal of the American Leather Chemists Association publishes manuscripts on all aspects of leather science, engineering, technology, and economics, and will consider related subjects that address concerns of the industry. Examples: hide/skin quality or utilization, leather production methods/equipment, tanning materials/leather chemicals, new and improved leathers, collagen studies, leather by-products, impacts of changes in leather products industries, process efficiency, sustainability, regulatory, safety, environmental, tannery waste management and industry economics.
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