| 摘要 |
A high solids content silicon emulsion comprises an anionically stabilized, hydroxyl-endblocked polydiorganosiloxane, amorphous silica, an alkyl tin salt, and optionally an organic amine and additional fillers, and has a solids content of 55 percent by weight or greater and a pH of greater than 9. Drying the emulsion under ambient conditions produces a cured elastomeric product with useful physical properties which make it particularly suitable as a coating for surfaces to be buried in the earth or as non-slumping caulking compounds for building joints. The emulsion can be prepared by emulsifying a diorganosiloxane using an anionic surfactant, adding amorphous silica to the hydroxyl- endblocked polydiorganosiloxane emulsion, adding an alkyl tin salt, and optionally an organic amine and additional fillers. The resulting emulsion yields a cured elastomeric product upon drying without the addition of cross-linking agents. |
