| 摘要 |
The present invention comprises a low-cost, convenient -to use anti-punking binder system for use in bonding entangled masses of mineral fibers such as glass. The binder system comprises a phenolic--formaldehyde resin mixed with a water soluble urea-foraldehyde resin, the urea-formaldehyde resin content in the binder system comprising an amount of about 5 to 50% by weight of the binder solids content. The urea-formaldehyde resin comprises about 59% urea, about 19% formaldehyde and about 22% water by weight. Silane, ammonia and ammonium sulfate may also be added. |
