Preparation and characterization of super-strong natural rubber latex film

Abstract Natural latex materials with excellent elongation, widely used in impregnated products and foam products. However, the lack of performance of traditional products has limited their application in high-end aspects, such as condoms and medical gloves. In this study, orthogonal test was used to determine the basic formula, and then silica and silane coupling agents were used to further improve the properties of natural latex film. The purpose of reinforcing natural latex film was realized, and super reinforced natural latex film was prepared. The results showed that the primary and secondary order of the optimized formula of natural rubber latex was sulfur > accelerator PX > zinc carbonate > Accelerator M with the tensile strength and tear strength as the indexes. With the increase of silica content, the tensile strength and tear strength of the obtained natural rubber latex vulcanized film reached 27.59 MPa and 50.73 kN/m, respectively. With the increase of the amount of silane coupling agent, the tensile strength of the obtained natural rubber latex vulcanized film was further increased to 29.01 MPa, while the tear strength tended to decrease. Including infrared spectroscopy, scanning electron microscopy, thermogravimetric analysis and other instrument analysis to further reveal the mechanism of silica reinforced natural rubber latex.