干法制备高醚化三聚氰胺树脂

High-Etherification Melamine Formaldehyde Resin by Dry Method

摘要:

摘要：以三聚氰胺及甲醛等为原料，采用干法制备“低甲醛、高固含、高稳定性”的环保型高醚化三聚氰胺树脂，并对各反应阶段物料配比、温度、pH等多种影响因素进行了探讨，确定了最佳的制备条件。研究结果表明：当羟甲基化反应阶段n（三聚氰胺）：n（甲醛）= 1:10，反应温度为75 ℃，pH = 9.0，反应时间为50 min，醚化反应阶段n（六羟甲基三聚氰胺，即HMM）：n（醇）= 1:10，反应温度为65 ℃，pH = 5.5时，制成的高醚化三聚氰胺树脂固含量高达90%以上，羟甲基含量可达51.4%，且游离甲醛含量低于0.3%。

Abstract:

Abstract : Selecting melamine and formaldehyde as raw materials, the eco-friendly high-etherification melamine formaldehyde resin was prepared through dry method with low formaldehyde, high solid content and high stability. Meanwhile, factors such as ratio of the material in each reaction stage, temperature, pH, were discussed to confirm the optimal preparation condition. The results indicated that when hydroxymethylation reaction stage n（melamine）：n（formaldehyde）= 1:10, reaction temperature was 75 ℃, pH was 9.0, the reaction time was 50 min, and when etherification reaction stage n（HMM）：n（alcohol）= 1:10, the reaction temperature was 65 ℃, pH was 5.5, the solid content of high-etherification melamine formaldehyde resin was higher than 90%, and the content of hydroxyl methyl was 51.4% ,while the free formaldehyde content was less than 0.3%.