Preparation method of PTUF resin glue for E0 grade outdoor plywood

Application number: CN201410524489.2 Application date: October 8, 2014

Publication Number: CN104356329A Publication Date: February 18, 2015

[Applicant]Research Institute of Forest Products Chemical Industry, Chinese Academy of Forestry [Address] No. 16, Suojinwu Village, Xuanwu District, Nanjing, Jiangsu 210042

Inventors: Zhao Linwu, Wang Chunpeng, Liu Meihong, and Chu Fuxiang

[Patent Agency] Nanjing Jingwei Patent and Trademark Agency Co., Ltd. 32200 [Agent] Tang Xunwen

[Country and Province Code] 32

[Abstract] Preparation method of PTUF resin glue for E0 grade outdoor plywood: step 1: add PT activation liquid with stirring, the first batch of urea U①; add the first batch of formaldehyde solution F①; heat to 88-92℃, react for 40min; step 2: add the second batch of urea U②; add the second batch of formaldehyde solution F②; gradually add the first batch of NaOH solution NaOH① within 30min, react at 85-88℃ for 70min; step 3: add the third batch of urea U③, add the third batch of formaldehyde solution F③, gradually add the second batch of NaOH solution NaOH② within 20min, react at 85-88℃ until the viscosity reaches 40-50s, and the viscosity is tested by Tu-4 cup at 70℃; step 4: add the fourth batch of urea U④, add the third batch of NaOH solution NaOH③, react at 80-85℃ for 10-20min, cool to below 45℃ and discharge to obtain PTUF resin glue for E0 grade outdoor plywood.