It is produced from Urea and formaldehyde.

Materials:

Name                                                      QTY(/g)        

Industrial Formaldehyde (36%)           960

potassium hydroxide(30%)                 some

Urea(Nitrogin content 46.6%)             370

Formic Acid(20%)                               some

Processing:

Put formadehyde into reactor,mixing,and add potassium hydroxide to make PH to 7.5,

heating to 40℃，adding 3/4 urea of total amount,then heat to 90℃ in 50-60mins and keep

20mins. Then adding remining Urea and reacting for 40mins in 90℃. To add formic acid to

make PH in 5.3-5.6 and in 92℃ keep warming 30mins,then heating slowly to 97℃。

When viscosity reaches to requested one,adding potassium hydroxide to make PH at 7.5-8.

Vacuum dewatering,when it reaches to 65% of formaldehyde water and stop dewartering.

Cooling,and add potassium hydroxide to make PH at 7-8 at same time. When temperature

cool to 50℃ and release the glue to tank.