Urea formaldehyde resin (UF), also known as urea formaldehyde resin, is a thermosetting resin formed by the condensation of urea and formaldehyde in the initial stage under the action of a catalyst (alkaline or acidic catalyst), and then under the action of a curing agent or auxiliary agent, it becomes insoluble and non melting in the final stage. [1] The cured urea formaldehyde resin is lighter in color than the phenolic resin, translucent, resistant to weak acids and alkalis, good in insulation, excellent in abrasion resistance, and cheap in price. It is the largest type of adhesive, especially in the manufacturing of various wood-based panels in the wood processing industry, urea formaldehyde resin and its modified products account for about 90% of the total amount of adhesive. However, urea formaldehyde resin is prone to decomposition when exposed to strong acids and alkalis, with poor weather resistance, poor initial adhesion, large shrinkage, high brittleness, water resistance, and easy aging,
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