| 摘要 |
<p>A process for preparing super lightweight sheet of the present invention comprises the steps of mixing a low density polyethylene (LDPE), a first blowing agent, a surface activation agent and a separation agent; heating the obtained mixture at a temperature higher than 160 DEG C to obtain a molten mass; heating said molten mass at a temperature higher than the gasification temperature of said first blowing agent to separate said first blowing agent; cooling the obtained mixture; and forming the cooled mass in a sheet. In a preferred embodiment, the process of the present invention process further comprises the steps of introducing a second gaseous blowing agent in the cooled mass to obtain a foamed mass; maintaining the foamed mass at a stabilizing temperature to stabilize the foamed mass; and cooling the foamed mass at 20-25 DEG C and maintaining the cooled mass at said temperature for 24 hours.</p> |
