| 摘要 |
<p>PURPOSE:To regenerate only polyamide selectively from wastes containing the polyamide, by dissolving the wastes in hydrous ethylene glycol to remove undissolved substances, and by cooling the solution. CONSTITUTION:Wastes comprising polyamide or its mixture with other substances are dissolved in ethylene glycol containing 0.1-10 wt.% of water at 120 deg.C or above, preferably 190 deg.C or below, and the undissolved substances are removed by filtration and centrifugation. The solution is then cooled to deposit the polyamide, which is recovered. Polymer wastes discharged from textile manufacturing factories, fibrous wastes, woven fabrics, tire cords, carpet, and films may be used as the wastes. When the dissolving temperature is lower than 120 deg.C, the polyamide cannot be dissolved well to worsen the operating efficiency. Too high temperature is undesirable due to trouble to equipment.</p> |
