Ultra-low ammonia concentrated natural rubber latex (CNRL) has garnered significant attention due to its environmental advantages and broad application potential. However

its suboptimal storage stability remains a critical limitation. This study systematically investigated three preservation strategies for thioketone derivative (TD)-stabilized ultra-low ammonia CNRL: 1) lauric acid (LA) concentration optimization

2) potassium hydroxide (KOH) supplementation

and 3) tetramethylthiuram disulfide/zinc oxide (TZ) biocide incorporation. All approaches demonstrated efficacy in reducing rubber particle size and improving preservation performance. Notably

LA concentration elevation emerged as the most effective intervention

achieving a mechanical stability time (MST) exceeding 1200 seconds while significantly decreasing average particle size. KOH supplementation alone attained an MST over 1000 seconds with comparable particle size reduction. However

these strategies exhibited differential effects on material properties: increased LA content delayed vulcanization kinetics and compromised tensile strength of both dry and vulcanized films

whereas KOH addition enhanced vulcanized film mechanical properties despite reducing dry film strength. Both LA enrichment and KOH incorporation substantially improved pre-vulcanized latex stability

reducing viscosity by 15-20% while maintaining colloidal stability. All treatments increased the number-average molecular weight of dry films without altering infrared spectral characteristics or thermal decomposition profiles . Comparative analysis revealed LA-enhanced CNRL as the optimal formulation

though vulcanization rate modulation remains necessary for process optimization. This work demonstrates that strategic preservation system modifications can effectively address the stability limitations of ultra-low ammonia CNRL while preserving essential rubber films properties. The findings provide practical guidance for developing high-performance environmentally friendly CNRL products.