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A Study on the Preparation of Environmentally Friendly High-Performance Natural Rubber Using the Interaction Mechanism of Alkaline Protease and Calcium Ions

文献类型： 外文期刊

作者： Dai, Tuo 1 ; Li, Yun 2 ; Huang, Honghai 1 ; Ding, Li 1 ; Li, Jianwei 1 ; Geng, Haoran 1 ; Song, Yazhong 1 ; Zhao, Tao 1 ; Zhao, Liguang 1 ; Gui, Hongxing 1 ;

作者机构： 1.Chinese Acad Trop Agr Sci, Rubber Res Inst, Hainan Nat Rubber Technol Innovat Ctr, Haikou 571101, Peoples R China

2.Mengla Tianye Rubber Sales Co Ltd, Xishuangbanna 666100, Peoples R China

关键词： natural rubber (NR); coagulation; alkaline protease; high-performance; environmentally friendly

期刊名称：POLYMERS （ 影响因子：4.9； 五年影响因子：5.2 ）

ISSN：

年卷期： 2025 年 17 卷 4 期

页码：

收录情况： SCI

摘要： Natural rubber (NR) is a material with a wide range of industrial and commercial applications, including agriculture, defense, transportation, and domestic use. However, the mechanical properties of natural rubber treated by traditional acid coagulation are limited, which restricts its application in high-end products. Furthermore, the wastewater generated also causes soil acidification. Consequently, there is a necessity to investigate new coagulation methods to enhance the comprehensive performance of natural rubber and reduce environmental pollution. In this work, a novel method for the preparation of environmentally friendly high-performance natural rubber by alkaline protease/calcium chloride coagulation of natural rubber (AC-NR) is reported. The research demonstrates that the products of protein cleavage by alkaline protease together with calcium ions can greatly enhance the cross-linking between rubber particles, form the network structure of natural rubber well. Furthermore, increasing the pH at the isoelectric point of the discharged wastewater reduces the impact on soil acidification. In comparison with those from conventional acid coagulation of natural rubber (A-NR), the tensile strength of AC-NR was increased by 7.9 MPa, the tear strength was increased by 5.3 kN/m, the final temperature rise was lowered by 6.5 degrees C, and abrasion performance was improved. This study demonstrates that by utilizing the collaborative impact of alkaline protease and calcium chloride on the rubber molecular chain during the coagulation process of natural rubber, environmentally friendly high-performance natural rubber with excellent mechanical properties and reduced environmental pollution can be prepared without the necessity for chemical modification or cumbersome processes, which is conducive to the green development and high-quality pursuit of NR materials.

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