疏水聚合物Mannich碱的合成及溶液性能

Synthesis and Solution Properties of Hydrophobic Polymer Mannich Base

摘要:

将增黏用碳五石油树脂作为疏水单体，与丙烯酰胺聚合反应得到AM/C5二元共聚物，通过胺甲基化反应制得疏水聚合物Mannich碱。考察了单体质量比、引发剂用量、反应温度以及pH对聚合反应的影响；讨论了反应时间、反应温度以及溶液pH对Mannich碱溶液表观黏度的影响。采用FTIR、1HNMR对产品进行结构表征，并对产品性能进行分析。结果表明，最佳聚合条件为：反应温度40℃，pH=8，引发剂质量分数0.5%，丙烯酰胺与碳五石油树脂的质量比为15:1。当反应时间为5 h，温度60~70℃，pH= 9，酰胺基、甲醛、二甲胺的摩尔比为1:1.1:1.5，Mannich碱溶液黏度达到最佳(418 mPa·s)。温度为90℃时，Mannich碱的黏度保留率为43.3%；当NaCl、CaCl2的质量浓度均为2000 mg/L时，其黏度保留率分别为32.8%、21.7%。因此，该Mannich碱具有较好的增黏、耐温及耐盐性。

Abstract:

Copolymer AM/C5 was synthesized by copolymerization of hydrophobic monomer(C5 petroleum resin) with acrylamide, and then the novel hydrophobic polymer Mannich base was prepared from aminomethylation with copolymer. Effect of mass ratio of C5 petroleum resin and acrylamide, initiator dosage, reaction temperature and pH value on polymerization were investigated. Effect of reaction time, temperature and pH value on apparent viscosity of mannich base were discussed. The structure of products was characterized by FTIR and 1HNMR, and the performance analyzed. The results showed that the optimum conditions of copolymerization were as follows：reaction temperature 40℃, pH 8, initiator mass fraction 0.5% of the monomer mass, m(AM):m(C5)=15:1. The Mannich base solution has a higher value of apparent viscosity is 418 mPa·s under the conditions of reaction time 5 h, temperature 60~70℃, pH 9, n(AM):n(HCHO):n(NH(CH3)2)=1:1.1:1.5. When the temperature was 90℃, the viscosity reserved rate was more than 43.3%; when the mass concentration of NaCl、CaCl2 was 2000 mg/L, the viscosity retention rate was 32.8% and 21.7%,respectively. Therefore, the Mannich base possessed the excellent tackability; temperature tolerance and salt resistance.