Method for recycling urea-formaldehyde (UF) and raw materials from wood-based panel, and use thereof

A method for producing a new particle board, comprising:

• (1) cutting a UF-glued wood-based panel into 2.54 mm×5.08 mm panel pieces, placing the panel pieces and distilled water at a weight ratio of 1:5 in an ultrasonic processor, and conducting an ultrasonic treatment at an ultrasonic frequency of 40 kHz and 50° C. to 80° C. for 40 min to 100 min to obtain a recycled wood-based panel pieces;
• soaking the recycled wood-based panel pieces in a pool at a room temperature for half an hour;
• (2) heat-grinding the recycled wood-based panel pieces with a moisture content of 77% in a heat grinder to obtain a recycled wood-based panel raw material;
• and
• (3) mixing the recycled wood-based panel raw material with industrial UF to obtain a mixture, using the mixture as a particle board core layer to produce a common particle board, and conducting hot pressing to obtain the new particle board containing 50% of a recycled particle board raw material, wherein in the common particle board, an upper surface layer, the core layer, and a lower surface layer are at a ratio of 25:50:25, and the recycled particle board raw material has a utilization rate of 50%.