Chemical Composition, Zeta Potential, Surface Tension and Contact Angle of Rubber Latex on Glazed/Unglazed Porcelain Hand Mold Surface Effect to Physical and Mechanical Properties of Rubber Latex Glove Films

摘要

There are many factors effect to physical, chemical and mechanical properties of rubber latex glove film formation, i.e., types of hand mold (glazed and unglazed molds) and rubber latex compound (synthetic and natural rubber latex) dipping time, curing temperature, zeta potential, surface tension, contact angle. Enhancing wettability can promote the spreading of rubber latex over a desirable hand mold surface. The best condition of hand mold preparation is unglazed porcelain fired at 1250°C. The main composition of obtained porcelain hand mold composed of 63.741 wt.% SiO_2, 25.595 wt.% Al_2O_3 and 3.640 wt.% K_2O. The obtained porcelain hand mold for rubber latex film formation has high compressive and flexural strengths, low thermal conductivity, low thermal expansion coefficient and good chemical corrosion resistance equal to 86.0 MPa, 179.4 MPa, 0.2492±0.0003 W/m.K, 5.8570×10~(-6) (°C)and 0.3870 wt.%, respectively. Natural rubber latex compound has surface tension lower than that of synthetic rubber latex compound. Therefore, surface tension values of rubber latex compound droplets affect to the contact angle on the porcelain hand mold surface. The contact angle of a synthetic rubber latex compound droplet on hand mold surface is higher than that of a natural rubber latex compound droplet on the same hand mold surface. The low contact angle can increase rubber latex film formation effect to obtain high tensile strength, elongation at break and film thickness. Furthermore, the long dipping time affects to high film thickness also.