二步法合成聚羧酸鹽高效減水劑的研究

化工論文編號:HG195  論文字數:11802,頁數:25

目錄
中文摘要 Ⅰ
英文摘要 Ⅱ
目錄 III
1 緒 言 1
1.1 選題的背景與意義 1
1.2  文獻綜述 2
1.2.1 減水劑的發展及研究概況 2
1.2.2分子結構設計及其優點 3
1.2.3二步法合成聚羧酸鹽高效減水劑的作用機理 4
1.2.4 二步法合成聚羧酸鹽高效減水劑和水泥的相容性 5
2 實驗部分 6
2.1試驗材料 6
2.1.1 合成減水劑原料和試劑 6
2.1.2 水泥凈漿試驗材料 6
2.2  實驗設備 6
2.3  合成工藝流程 7
2.4 二步法合成聚羧酸高效減水劑的合成方法 7
2.4.1 第一步:大單體的合成 7
2.4.2 第二步:減水劑的合成 7
2.4.3 減水劑含固量的測定 8
2.4.4 水泥凈漿流動度的測試 8
3  結果與討論 9
3.1 不同廠家生產的MPEG對減水劑性能的影響 9
3.2引發劑用量的影響 9
3.3混合聚醚為原料制備的減水劑的性能比較 11
3.4引入PPG對水泥凈漿流動度的影響 12
3.5 MAn替代部分MAA的影響 12
3.6不同減水劑產品的性能對比 13
3.7與萘系減水劑性能比較 15
3.7.1二步法合成聚羧酸鹽高效減水劑與萘系減水劑性能比較 15
3.7.2二步法合成聚羧酸鹽高效減水劑與萘系減水劑混凝土對比實驗 15
4 總結與展望 17
4.1 總結 17
4.2 未來展望 17
致  謝 19
參考文獻 20

摘要：本文簡要的敘述了研究二步法合成聚羧酸鹽高效減水劑這個課題的內容及其意義，介紹了近年來國內外二步法合成聚羧酸鹽高效減水劑發展現狀、從本質上分析了二步法合成聚羧酸鹽高效減水劑的作用機理等。簡單的描述了二步法合成聚羧酸鹽高效減水劑合成方法、工藝方案及實驗檢測方法，并對實驗從實驗原料的選擇，引發劑對減水劑性能的影響，比較了混合聚醚為原料制備的減水劑的性能，引入PPG后能否起到消泡功能，尋求MAA的替代品及與國內外同系列產品比較、與萘系減水劑之間的比較及混凝土實驗等這幾個方面進行了數據整理、比較及分析。然后針對實驗數據，作出了一些結論性的分析。最后對全文進行總結，并提出今后研究的方向及對二步法合成聚羧酸鹽高效減水劑一些展望。
關鍵詞：二步法合成；聚羧酸；減水劑；MPEG；水泥凈漿流動度

Abstract：This paper described the research of two-step synthesis of polycarboxylic superplasticizer, the contents of the subject and its significance briefly，and introduced the development of two-step synthesis of polycarboxylic superplasticizer in recent years at home and abroad ,and analyzed the mechanism of superplasticizer in essence. Moreover, it described the synthesis methods, techniques and experimental characterizaton method of two-step synthesis of polycarboxylic superplasticizer. Some data processing, comparison and analysis through the experimental materials from the choice experiment were made. The effect of initiator dosage, preparation from  different mixed polyoxyethylenes for cement fluidity , PPG introduced after they played an antifoaming function , MAA seeking alternatives were investigated. The comparison among the aphthalene superplasticizer, polycarboxylic superplasticize with two-steps synthesis and a series of comparative products at home and abroad was made through concrete experiment. Then, some concluding analysis from experimental data was made. Finally，the paper was summarized, and some prospects of future research directions to two-step synthesis of polycarboxylic superplasticizer was proposed.
Keywords: two-step synthesis; polycarboxylic; superplasticizer; MPEG; cement fluidity