Polyurethane generally has insufficient high temperature resistance. Generally, polyurethane begins to lose strength at 80°C to 90°C. If the temperature is raised further, damage will occur. The polymer begins to decompose at 220°C. Regarding temperature-resistant polyurethane, foreign countries have There are studies, but they are all patented and there are few domestic studies. Polyurethane is a type of polymer whose main chain contains -NHCOO- repeating structural units. Because it contains highly polar urethane groups and is insoluble in non-polar groups, it has good oil resistance, toughness, wear resistance, and Aging and adhesion. It is not resistant to hydrolysis at high temperatures and is not resistant to alkaline media.
Polyurethane is generally slightly toxic, but not edible. However, if toxic flame retardants or other non-reactive toxic substances are added to the raw materials used, the foam will also be toxic, so be careful when contacting it. .
lt;/bgt;