Method for preparing urea-formaldehyde resin adhesive
A urea-formaldehyde resin and adhesive technology, applied in the direction of adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve the problems of high production cost, low environmental protection coefficient, large amount of glue, etc., and achieve production costs. Low, small amount of glue, the effect of reducing production costs
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Embodiment 1
[0013] (1) Heat 100 parts by mass of formaldehyde to 38°C, adjust the pH value to 7.8 with a NaOH solution with a mass concentration of 30%, then add 0.0030 parts by mass of tapioca starch and 33.98 parts by mass of urea, and heat up to 70°C to stop heating After that, wait for it to naturally heat up to 90°C for 30 minutes;
[0014] (2) Use a CHOOH solution with a mass concentration of 42% to adjust the pH value of the mixture obtained in step (1) to 4.5, and then react to the cloud point at 92°C; then adjust the pH value to 6.3 with a NaOH solution with a mass concentration of 28% , finally add the cassava starch of 0.0030 mass parts, stir and make the cassava starch dissolve completely; The cassava starch used is provided by Guangxi Yunlong Science and Technology Co., Ltd. manufacturer;
[0015] (3) Add 18.46 parts by mass of urea to the mixture obtained in step (2), and react at 92°C until the mixture is dropped into 69°C water to form a white mist, and the reaction is ter...
Embodiment 2
[0017] (1) Heat 100 parts by mass of formaldehyde to 40°C, adjust the pH value to 7.8 with NaOH solution with a mass concentration of 30%, then add 0.0029 parts by mass of additive A and 33.85 parts by mass of urea, and heat up to 70°C to stop After heating, wait for the temperature to rise naturally to 89°C for 28 minutes;
[0018] (2) Use a CHOOH solution with a mass concentration of 40% to adjust the pH value of the mixture obtained in step (1) to 4.4, and then react to the cloud point at 90°C; then adjust the pH value to 6.2 with a NaOH solution with a mass concentration of 29% , finally add 0.0035 parts by mass of auxiliary agent A, and stir to completely dissolve auxiliary agent A;
[0019] (3) Add 18.46 parts by mass of urea to the mixture obtained in step (2), and react at 88°C until the mixture is dropped into 68°C water to form a white mist, and the reaction is terminated, and then adjusted with a NaOH solution with a mass concentration of 29%. When the pH value rea...
Embodiment 3
[0021] (1) Heat 100 parts by mass of formaldehyde to 42°C, adjust the pH value to 7.8 with a 30% NaOH solution, then add 0.0027 parts by mass of tapioca starch and 34.23 parts by mass of urea, and heat up to 70°C to stop heating After that, wait for its natural temperature to rise to 88°C for 32 minutes;
[0022] (2) Adjust the pH value of the mixture obtained in step (1) to 4.6 with a CHOOH solution with a mass concentration of 39%, and then react to the cloud point at 88°C; then adjust the pH value to 6.3 with a NaOH solution with a mass concentration of 31% , finally add the tapioca starch of 0.0038 mass parts, stir and make tapioca starch dissolve completely;
[0023] (3) Add 18.46 parts by mass of urea to the mixture obtained in step (2), and react at 85°C until the mixture is dropped into 70°C water to form a white mist, and the reaction is terminated, and then adjusted with a NaOH solution with a mass concentration of 28%. When the pH value reaches 7.8, when the temper...
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