| 摘要 |
A porous soil granular material is proposed that is suitable for the reversible storage of water, and also a method is proposed for production thereof. The soil granular material contains, according to the invention, at least one open-pore foam in the form of expanded clay on the basis of natural clay minerals and/or in the form of a foamed polycondensation product made of polycondensed phenylpropanoid alcohols or of polycondensed polyhydroxyphenols. A corresponding production method provides that, for generating granular particles based on expanded clay, natural clay minerals are optionally premixed and extruded, after which the extrudate is granulated and fired at elevated temperature in order to evaporate the enclosed water and foam the granular material. To generate particles from the foamed polycondensation product, the phenylpropanoid alcohols or the polycondensed polyhydroxyphenols are polycondensed in the presence of a blowing agent, wherein the blowing agent is activated, after which the polycondensation product is dried and granulated. |
