| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method for separating flame retardants from waste flame-retardant polymer for removing flame retardants from flame-retardant polymer through a simple process, thereby obtaining useful substance that is recyclable as a general resin. SOLUTION: A flame-retardant resin composition comprising a thermoplastic resin and halogen flame retarders is brought into contact with carbon dioxide in the supercritical state to extract the halogen flame retarders. In this invention, a reaction accelerator may be used together and the combination use of the accelerator is preferred in order to increase the extraction efficiency and simplify the operation conditions. As a reaction accelerator, are cited polar substances, for example, water and organic solvents such as alcohols and ketones (acetone), optimally methanol.</p> |
