| 摘要 |
Compounding urea resin with powd. alkali glass or encapsulated Ca silicate and additives gives adhesives for plywood. Thus, a mixt. of 48% urea resin 100, alkali glass(av. particle size, 1-35μm) 20, wheat flour 5, and 20% NH4Cl 5 parts is coated to 150 g/m2 on both sides of lauan veneer which is placed between 2 veneers, cold-pressed for 15 min at 10 kg/cm2 and for 2.5 min at 100 kg/cm2, 110≦̸C to give plywood with shear strength 17.8 kg/cm2.
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