按酚醛(PF)树脂的制备工艺,采用CaO和NaOH为复合催化剂,在碱性条件下制备了U/P质量比13.2%￣79.2%的系列尿素改性酚醛(PUF)树脂。该胶制备工艺简单,反应平稳,操作易控制,再现性好,成本较低,贮存期达30d以上。该系列PUF树脂压制的杨木三合板,胶合强度符合Ⅰ类胶合板要求,甲醛释放量<0.5mg/L,符合E0级标准。 According to the preparation process of phenolic resin (PF), a series of urea-modified phenolic resin (PUF) with U / P mass ratio of 13.2% ~ 79.2% were prepared under basic conditions using CaO and NaOH as composite catalysts. The preparation process of the glue is simple, the reaction is steady, the operation is easy to control, the reproducibility is good, the cost is low, and the storage period reaches more than 30d. This series of PUF resin pressed poplar plywood, gluing strength meet the requirements of class Ⅰ plywood, formaldehyde emission <0.5mg / L, in line with the E0 level standards.