Modified deodorant urea-formaldehyde (UF) resin and use thereof, as well as particleboard and preparation method thereof

A preparation method of a particleboard, the particleboard comprising a first surface layer, a core layer, and a second surface layer which are formed in sequence, wherein raw materials for preparing the first surface layer and the second surface layer both comprise fine shavings or particles and a modified deodorant urea-formaldehyde (UF) resin;

• and raw materials for preparing the core layer comprise coarse shavings or particles and the modified deodorant UF resin, and
• the preparation method comprising the following steps:
• (1) mixing the coarse shavings with the modified deodorant UF resin to obtain a coarse material for the core layer;
• (2) mixing the fine shavings with the modified deodorant UF resin to obtain a fine material for the two surface layers;
• and
• (3) laying the fine material for the first surface layer, the coarse material for the core layer, and the fine material for the second surface layer in sequence, and conducting hot pressing to obtain the particleboard,
• wherein there is no time sequence between steps (1) and (2), and
• wherein the modified deodorant UF resin is prepared from the following raw materials:
• melamine-modified UF resin (MUF), aluminum ammonium sulfate dodecahydrate, wax, and water, wherein the MUF comprises 45-49% of urea, 48-52% of formaldehyde, and 1-7% of melamine by mass percentage;
• the aluminum ammonium sulfate dodecahydrate accounts for 1-7% of a mass of the MUF;
• the wax accounts for 0.1-1.5% of the mass of the MUF;
• and the water accounts for 20-50% of the mass of the MUF.