| 摘要 |
The invention relates to a method for producing methylene urea polymers using urea, a formaldehyde product and a reactant, such as an acid. Urea is introduced into a multi-screw extruder together with the formaldehyde product. In the extruder the products are mixed, compressed, heated and melted to a flowable mixture. A reactant, such as an acid is added to the melted mixture, thereby forming a mass having methylene urea polymers. The mass is extruded afterwards. |
