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Melamine modified urea-formaldehyde resin introduction

Guo Network 2015-01-10 09:42:13
Solid Urea-formaldehyde resin after a structured, there are still such as hydroxy, amino, imino, carbonyl and other hydrophilic groups. With three amine modified polyurethane urea resin aim is poor water resistance, high free formaldehyde content of the reason for the presence of urea-formaldehyde resin, with a Quantitative modified melamine, urea-formaldehyde resin to improve the water resistance, dimensional stability, crack resistance, abrasion resistance and reduce the free formaldehyde content. Practice proved that melamine modified urea formaldehyde resin adhesive is put Effective method for high performance. Back in 1944, McHale on melamine urea formaldehyde resin to improve water resistance. In 1947, Delmonte to improve resistance to boiling water with melamine urea formaldehyde resin Performance, the results shown in Fig. 1. 1965 Houwink and Salomon urea formaldehyde resin, melamine resin adhesives, melamine urea formaldehyde resin adhesive co-condensation boiling water resistant capabilities Comparing the results shown in Figure 2. The figure shows that melamine modified urea-formaldehyde resin adhesive water resistance near melamine resin adhesive. Chang Jun of the resorcinol, melamine and other modifiers for comparison Comparative studies, noting with resorcinol and melamine urea formaldehyde resin modified to improve the water resistance of the most significant, but melamine modified urea formaldehyde resin bonding strength and better color finished board. The study shows that by Blomquist trimer Melamine urea formaldehyde resin modified with resorcinol stronger than the high temperature performance of its products. Kehre noted that, compared with other modifiers melamine, particleboard obtained with high dimensional stability and lower thickness swelling