| 摘要 |
PURPOSE:To prevent water content from sticking directly on the resin part of polyurethane foam even if it is exposed to large quantities of water content and to prevent hydrolysis by impregnating a nonhydrophilic impregnating agent into polyurethane foam having the communicated foams. CONSTITUTION:An air cleaner element 2 is constituted of polyester series polyurethane foam having the communicated foams. A resin part 8 and many communicated foams 9 are incorporated in the inside of the structure. A liquid impregnating agent is impregnated for this polyurethane foam by an impregnating method. The impregnating agent introduced into the communicated foams 9 is stuck to the resin part 8 around the communicated foams 9 and the protective film layers 10 due to the impregnating agent are formed. As this impregnating agent, a nonhydrophilic material free from a hydrophilic compd. is used and both base oil and silicone oil are preferably used. In this air cleaner element, polyurethane is not hydrolyzed even in the environment incorporating large quantities of water content and the deterioration thereof can be prevented. |
