Improvement of Heat-resistance of RTV Silicone with Reduced Environmental Impact by Loading Selective Fillers Elastomers

Abstract

In this paper, a durability of a new room temperature vulcanizing (RTV) silicone under high temperature and high humidity is presented in addition to the mechanical and adhesive properties. Because the authors have succeeded in making a new hardener for RTV silicones as a replacement of organic tin compounds in compliance with the EU regulation. It is presented that how the new RTV silicone is better durability and mechanical properties, than those made with conventional hardener. The new hardener (NHD) consists of a titanium alkoxide and a carboxylate ester as a hardener and a promoter in quimolar, respectively. It has been found that the silicone made with the NHD stands comparison with that made with organic tin compound hardener on mechanical properties and shows better mechanical properties than that made with titanium chelate compound or tetraethoxytitanium. A silicone composite made with a combination filler of a reinforcing fumed silica treated by dimethylsilane at surface and an extending agent of the ground calcium carbonate yields a good endurance for heat and humidity and a good adhesive strength.