A few days ago, Guangzhou Institute of Chemistry, Chinese Academy of Sciences, used carbon dioxide and propylene oxide as raw materials to prepare a polycarbonate polyol with a relative molecular weight of about 3000 and a molar fraction of carbonate groups in the molecule of 30% to 40%. Full-water foaming process prepares aliphatic polycarbon polyurethane semi-rigid plastics. This kind of semi-rigid polyurethane has higher strength and density than traditional semi-rigid foam plastics. In addition, since the foam contains a large number of -COO structural units, its combustion heat is much lower than polyether polyurethane foam, polyester polyurethane foam, etc., and has a certain degree of flame retardancy. Studies have also shown that polyethylene carbonate polyurethane foams obtained with carbon dioxide and ethylene oxide as starting materials have good biodegradability and are very favorable for environmental protection. New Arrivals Hair Dryers give your hair a perfect conditioning for shiny, smooth and frizz-free hair. It is specially designed to keep your hair soft as it is equipped with big wind inlet which reduces air swirl for quiet and efficient drying. It comes with overheating protection for a safe hair drying experience. Hair Dryer The compact and foldable design makes it easy for you to handle and carry wherever you want to. New Arrivals Hair Dryers,best hair dryers,best affordable hair dryer,best hair dryer for damaged hair,best hair dryer for frizzy hair,best ionic hair dryers Ningbo Meirou Electric Appliance Co.,Ltd. , https://www.mrhairdryer.com