| 摘要 |
<p>The release of a moulded concrete body from the mould can be improved by applying, to the mould, an effective amount of a concrete release composition in the form of an oil-in-water emulsion in which the oily phase is at least one of the following: a mineral oil with a content of aromatics of at the most 9%, a vegetable oil and one or more oily esters of aliphatic carboxylic acids with mono- or dihydric alcohols and having a melting point of at the most 35oC, the total number of carbon atoms in the esters being 8-46, and comprising one or more non-ionic surfactants in an amount of 0.5-20% by weight and one or more anionic surfactants in an amount of 1-100%, based on the non-ionic surfactant. The emulsion may also comprise cationic surfactants, anti-freezes, stabilizers, corrosion inhibitors, etc. The oily esters of aliphatic carboxylic acids with mono- or dihydric alcohols may also be used in non-emulsified form.</p> |
