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Optimization Study of a High-Efficiency Preservative for Ammonia-Free Concentrated Natural Rubber Latex

文献类型： 外文期刊

作者： Zhao, Liguang 1 ; Xing, Peng 1 ; Zhao, Liyang 3 ; Yang, Qigui 3 ; Song, Yazhong 1 ; Ding, Li 1 ; Zhao, Tao 1 ; Wang, Yuekun 1 ; Xin, Zhenxiang 2 ; 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.Qingdao Univ Sci & Technol, Coll Polymer Sci & Engn, Qingdao 266061, Peoples R China

3.China Natl Petr Corp, Changqing Oilfield Branch, 4 Oil Prod Plant, Xian 710014, Peoples R China

关键词： concentrated natural rubber latex; ammonia-free; stability; mechanical properties

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 2 期

页码：

收录情况： SCI

摘要： Ammonia is commonly used as a preservative in the production of concentrated natural rubber latex (CNRL) and latex products; however, it poses a serious risk to human health and the environment. In this study, we investigated a thioacetamide derivative (TD) as a preservative of ammonia-free CNRL and the optimization of a stabilization system comprising potassium hydroxide (KOH), lauric acid (LA), and sodium dodecyl sulfate (SDS) to enhance its preservation effect. The results revealed that an optimal amount of TD (0.03%) can effectively maintain the stability of CNRL, inhibit the increase in volatile fatty acid number (VFA number), maintain stable viscosity values, and improve the mechanical stability time (MST). However, increasing the TD dosage results in an increase in both the viscosity and VFA number and a decrease in MST. KOH was used to regulate the pH value of CNRL. It was also found that it can enhance considerably the mechanical properties of CNRL dry films and accelerates the vulcanization of vulcanized film; however, an excessive amount causes latex thickening. LA proved essential for improving the MST and reducing latex viscosity, thereby substantially enhancing the stability and processability of pre-vulcanized latex, but an excessive amount is detrimental to the curing speed and final mechanical strength. SDS can rapidly improve the MST and reduce the viscosity, but it negatively affects the surface molding of dry rubber films. In conclusion, KOH, LA, and SDS at appropriate dosages play a balancing and complementary role in the preparation of ammonia-free CNRL. Upon analyzing diverse performance metrics of CNRL, it has been determined that the optimal TD dosage ranges from 0.02 to 0.03% for maximum efficacy. The KOH dosage should be maintained within 0.1-0.15% to achieve the most favorable outcome, while the LA dosage is advisable to be kept between 0.06 and 0.1%.

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