【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、p H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℃,p H=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℃,p H=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%。更多还原

【Abstract】 With 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,the factors such as ratio of the material in each reaction stage,temperature and p H,were discussed to confirm the optimal preparation conditions.The results indicate that,when n(melamine) ∶ n(formaldehyde) = 1 ∶10,reaction temperature was 75 ℃,p H was 9.0,the reaction time was 50 min in the hydroxymethylation reaction stage,and when n(HMM) ∶ n(alcohol) =1∶10,reaction temperature was 65 ℃,p H was 5.5 in etherification reaction stage,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%.更多还原