磺化三聚氰胺脲醛树脂合成工艺的研究

Synthesis of sulfonated melamine urea formaldehyde resins

研究了引入尿素含量较高的条件下 ,磺化三聚氰胺脲醛树脂 (SMUF)的合成工艺影响因素及作为混凝土超塑化剂的应用性能。结果表明SMUF的优化合成条件为 :n(甲醛 )∶n(硫酸 )∶n(三聚氰胺 )∶n(尿素 ) =6∶2∶1∶1 ,羟甲基化、磺化、酸段缩合、碱性重整 4个阶段的反应温度均为 80℃ ,酸段缩聚反应阶段pH为 4 .5 ,时间为 90min。合成的SMUF树脂在用量 0 5 %时 ,混凝土的减水率可达 2 0 %。该工艺与SMF树脂合成相比 ,原料成本降低 35 %。

Factors affecting synthesizing technology of sulfonated melamine urea-formaldehyde resin (SMUF) under high urea content, and performance of the product when used as concrete superplasticizer were studied. Results show that the optimal synthesis, conditions of SMUF are as follows: n (formaldehyde): n (sulfuric acid) : n (melamine) : n (urea) =6:2:1:1, four steps including hydroxymethylation, sulfonation, condensation and rearrangement, are all at 80°C, the condensation step lasts 90 min at pH 4.5. Water reducing ratio of concrete can reach 20% after adding 0.5% of SMUF. Feedstock cost of the technology is 35% less than SMF technique's.