| 摘要 |
<p>To enhance the mobility of polyurethane raw material (premixed polyol), adjust the reaction performance of the polyurethane raw material, fill the insulation door and the narrow portion of a box with hard polyurethane foam and enhance the insulation performance of the insulation door and the insulation box structure, the invention provides the insulation door and the insulation box structure. The insulation door and insulation box structure are prepared from hard polyurethane foam, the hard polyurethane is prepared from premixed polyol containing polyol, catalyst, water, cyclopentane and foam stabilizer and multi-methylene diisocyanate, wherein 30-80 wt% of the polyol is prepared by addition reaction of polyol with 4-8 active hydrogen groups and/or polyamine with alkenyl oxide, the infrared absorption spectrum peak from 1700 to 1720 cm<-1> is shown as A1, the infrared absorption spectrum peak from 1590 to 1610 cm<-1> is shown as A2, and A1/A2 is 1.7 to 2.0.</p> |
