Patent ID: 11958942
Assignee: SOUTHWEST FORESTRY UNIVERSITY
Field: Machine tools (Mechanical engineering)
Classification: CPC C  B | IPC B  C

Claim 0:
1. A method for recycling urea-formaldehyde (UF) from a wood-based panel, comprising the following steps:
(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 UF aqueous solution I and recycled wood-based panel pieces;
(2) taking out the recycled wood-based panel pieces, conducting filtering on the UF aqueous solution I obtained in step (1) with a 60-mesh filter to obtain a UF aqueous solution II, and centrifuging the UF aqueous solution II in a centrifuge at 10,000 rpm for 2 h to 6 h to obtain a recycled UF; and
(3) freezing the recycled UF obtained in step (2) at −4° C. for 1 d, and conducting freeze-drying in a freeze dryer under a vacuum degree of 80 Pas for 6 d to obtain a recycled UF solid.