| 摘要 |
<p>A process for preparing a binder comprising a heterocondensate of silicon compounds and metal or boron compounds, in which a hydrolysable silicon compound having a nonhydrolysable polymerizable group as Si component is mixed with water to form a hydrolysis product and a metal or boron compound in which the metal is selected from among Al, Ga, In, Tl, Ge, Ga, Sn, Pb, Ti, Zr, Hf, Sc, Y and La is then added to the hydrolysis product at a point in time which is in the range from 15 s to 15 min after mixing of the hydrolysable silicon compounds with the water, is described. This gives homogeneous heterocondensates which when used as binders give excellent resistance and strength. The binders are highly suitable for strengthening geological formations and beds of granular material which are used in oil and gas recovery to keep the sources open.</p> |
