INVESTIGATION OF THE USE OF ISOCYANATE ADDUCTS IN URETHANE FOAM
Abstract
The fea ibility of a one-can, delayed action foaming system was successfully d monstra e . A literary arch revealed that y co poun s po e ing ctive ydrogens may react with organic isocyanates to produce heat-s nsitive adducts. T HESE D UCT YI LD BACK THE ORIGINAL ISOCY N TE AND THE BLOCKI G AGENT WHEN HEATED. About 12 blocking agents were tested by preparing monomeric isocyanate adduc s. p- onylphenol, diethyl malo a , ethyl acetoacetate and tertbutyl alcohol were ost attractive for use as blocking agents in delayed- ction foaming sy e s. T o stable, one-ca , delayed-ac ion foaming systems were eveloped. rigid, delaye -action ystem was developed which made use of tertbutyl alcohol a a blocking agent. A partially blocked, quasi-prepolymer - containing boric acid as an auxiliary blowing agent, a foam stabilizer, and a catalyst - was t ble at room te peratur . H ED ABOVE !%) C, it pro uced a rigid foam. A flexible, delayed-action foam system was developed which utilized p-nonylphenol to completely block a fle ible tot l prepolymer. This system, heated above 170 C, produced a fully cured, fle ible polyure hane foa . (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 22, 1962
- Accession Number
- AD0277420
Entities
People
- A.f. Reilly
- L.m. Zwolinski