Effect of nanoZnO over conventional ZnO on preservation of concentrated natural rubber latex

Abstract

An attempt was made to replace conventional ZnO with nanoZnO in low ammonia, tetramethylthiuramdisulphide (TMTD)/Zinc oxide (ZnO) natural rubber latex preservative system (LATZ). Different percentages of TMTD and nanoZnO dispersions containing equal portions were prepared and used to preserve the latex. Centrifuged natural rubber latex (CNRL) thus prepared were tested for VFA (volatile fatty acid) number and MST (mechanical stability time) periodically over a period of 75 days. Mechanical properties of vulcanized latex thin films made out of CNRL preserved were measured. Development of VFA number in CNRL samples preserved with nanoZnO was lower than the sample prepared with the conventional ZnO (control). Both the VFA number results and surface plots of the matured CNRL samples showed that preservative action of the modified preservative system was mainly governed by the amount of nanoZnO in the system. MST values of CNRL preserved with nanoZnO substituted systems were significantly high when compared to the control. Tensile and tear properties of the vulcanized films prepared using CNRL preserved with nanoZnO were almost comparable with those of the vulcanized films prepared using control system. The statistical analysis indicated that CNRL preserved with modified preservative system of 10% and 15% of TMTD/nanoZnO could be stored up to 55 and 75 days respectively, without exceeding VFA value above 0.02.

Advancement of an Eco-Friendly and Innovative Sustainable Rubber Wrap Film Exhibiting Superior Sealing Properties

“…Concentrated latex of type HA has a minimum of 0.6% ammonia in the latex. Concentrated latex of type LA has a minimum of 0.2% ammonia in the latex with the addition of 0.025% TZ [26]. However, in this study, TZ was used at a concentration of 0.25%, higher than the normal 0.025%.…”

SiO2 and ZnO hybrid nanofillers modified natural rubber latex: Excellent mechanical and antibacterial properties

“…NRL has been widely used in healthcare industry and daily life because of its good elasticity, antiviral permeability, flexibility, formability, and good human compatibility. [3][4][5] NRL gloves and condoms are two of its most common products. However, NRL products also face serious problems such as low tensile strength, poor tear resistance, and easy aging, which limit the use of natural latex to a certain extent.…”