| 摘要 |
<p>PURPOSE:To produce an asphalt foam free from stickiness and having high processability and excellent flame-retardance, by impregnating a foamed sheet having open cell structure with a liquid mixture of an asphalt emulsion and an aqueous solution of an alkali metal silicate and drying the impregnated product. CONSTITUTION:1pt.(wt.) of asphalt is dispersed uniformly in 0.3-2pts. of water in the presence of a surfactant. 100pts. of the obtained asphalt emulsion is added with 5-30pts. of an aqueous solution of an alkali metal silicate (water- glass), and preferably added with >=10pts. (based on 100pts. of the water-glass) of a metal oxide (e.g. zinc oxide, magnesium oxide, etc.) or sodium silicofluoride to obtain a liquid mixture. The objective asphalt foam can be produced by impregnating the liquid mixture in a foamed sheet having open cell structure, preferably a urethane foam sheet and drying the product.</p> |
