酸酐与甲氧基聚乙二醇的酯化反应及产物的减水性能研究

文档编号:SW073  文档字数:9167,页数:27

摘 要：本文研究了甲氧基聚乙二醇（MPEG）和酸酐（马来酸酐或邻苯二甲酸酐）单酯化反应的工艺条件，详细探讨了了温度，原料配比， MPEG分子量,催化剂用量,反应时间等因素对反应酯化率的影响。发现温度为90℃时，MPEG分子量为1300，投料比为1：1.15，催化剂为2%时转化效果好。采用红外分析确定了产物结构。讨论了反应动力学，计算了活化能，邻苯二甲酸酐酯化反应的活化能高于马来酸酐酯化反应。同时初步研究了酯化产物在水泥中作为减水剂的效果，并发现有明显的减水效果。

关键词：马来酸酐；邻苯二甲酸酐；甲氧基聚乙二醇；酯化反应；小分子减水剂
Esterification of Anhydride and Methoxyl Polyethylene Glycol Ether and Water-reducing Performance of Its Product

Abstract: This article studied the reaction conditions of mono-esterification from methoxy polyethylene glycol(MPEG) and anhydride (maleic anhydride , phthalic anhydride ).The effect of the MPEG molecular weight, the amount of catalyst, reaction time ,the temperature and feed ratio on the esterification rate was discussed in details. It is found that conditions such as MPEG molecular weight, the amount of catalyst ,reaction time, feed ratio and temperature is 1300, 2%, 120 min ,1：1.15 and 90℃ respectively, the esterification rate reaches high level. The structure of product is characterized by IR analysis. The kinetics of the reaction is discussed and the activation energy is calculated. The activation energy of the esterification of phthalic anhydride is higher then the activation energy of maleic anhydride. Meanwhile the esterification product show some function as water-reducing agent in cement.
Keywords: Maleic anhydride; Phthalic anhydride; Methoxy polyethylene glycol;  Esterification;  Small water-reducing agent

目  录
中文摘要 I
英文摘要 II
目录 III
1. 绪论 1
 1.1 课题研究内容及意义 1
 1.2 文献综述 2
 1.3 课题的提出 4
2. 实验部分 6
 2.1 试验材料  6
      2.2  实验设备 6
 2.3  实验方法 6
3. 结果与讨论 9
     3.1 结构分析   9
      3.2 酯化率的影响因素 12
 3.3 无催化剂单酯化的反应动力学 16
 3.4 减水效果分析 18
4. 总结与展望 20
致谢 21
参考文献 22

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