Excellent Heat Resistance For Wallpaper Urea Formaldehyde Powder Resin Glue

Urea-formaldehyde (UF) is a cost-effective thermosetting resin that is widely used in the wood product industry. In the laboratory, urea-formaldehyde resins are prepared by using urea with formaldehyde in an alkaline or neutral medium to produce dimethylol urea, which then undergoes polycondensation, a chemical process that produces a polymer, when heated in an acidic medium.

Urea-formaldehyde resin is cured easily and is scratch resistant. They are mainly used in adhesives, finishes, particle boards, MDF, and molded objects. UF and related amino resins are considered a class of thermosetting resins of which urea-formaldehyde resins make up 80% globally.

1. Pretreatment for gluing wood material:
A) Moisture content reaches to 10 + 2%
B) Remove Knots, Cracks, oil stains, and resin, etc.
C) Wood surface must be flat and smooth. (Thickness Tolerance<0.1mm)
2. Mixture:
A) Mixture Ratio (weight): UF Powder: Water=1: 1(Kg)
B) Dissolution Method:
Put 2/3 of the total needed water into a mixer, and then add UF powder. Switch on the mixer with the speed of 50~150 rotations/minute, after the glue powder is completely dissolved in the water, put the remained 1/3 water in a mixer and stir for 3~5minutes till the glue to being completely dissolved
C) Workable period of dissolved liquid glue is 4~8 hours under room temperature.
D) The user could add hardener into the mixed liquid glue according to the actual requirement and control the active period of dissolution (if add hardener, the period of validity will be short, and if used under a heat temperature, no need to add a hardener)

1. Powder urea formaldehyde resin should be kept under seal to avoid direct sunlight and to prevent contact with moisture
2. Shelf life: 20°C (68°F) 12 months and 30°C (88°F) 6 months Room temperature, dry and cool place, sealed