Study on Surface Hydrophilic Modification and Properties of RTV Silicone Rubber.

The surface hydrophilic modification of talcum powder modified by polyoxyethylene (20 ) sorbitan monoleate was firstly carried out, and then it was blended with room temperature vulcanized ( RTV) silicone rubber. The influence of different amount of modified talcum powder on hydrophobicity, mechanical properties, and impression properties of silicone rubber was studied. The results show that the RTV silicone rubber can be vulcanized completely when the mass fraction of talcum powder is 55%, and its surface hydro-philicity can be improred effectively. The rubber has excellent impression performance, with tensile strength of 7. 7 MPa and the elongation at break of 163%. [ABSTRACT FROM AUTHOR]