| 摘要 |
A fire retardant composition, as well as a fire retardant and intumescent composition for the treatment of cellulosic material such as wood and processed wood, are disclosed. The fire retardant composition comprises dissolved urea anda substantially water soluble source of phosphate groups, for penetrating into the cellulosic material and for forming phosphate esters with the cellulosic material in the presence of the urea upon heating of the cellulosic material, and a water dispersible binder such as PVA capable of forming a substantially water impervious coating on the surface of the cellulosic material. The fire retardant and intumescent composition comprises an aqueous fire retardant solution as aforesaid, with a substantially water insoluble intumescent composition dispersed therein, for forming an intumescent layer on the surface of the cellulosic material.
|
