高固含量有機硅陰離子乳液的研制

材料科學論文編號:CL108  論文字數:10131,頁數:19

目錄
中文摘要 I
英文摘要 II
目錄 III
1 緒論 1
1.1研究背景和意義 1
1.1.1有機硅乳液的特性 1
1.1.2有機硅氧烷的結構及特性 1
1.1.3有機硅乳液的應用 2
1.2研究現狀分析 3
1.2.1陰離子引發的乳液聚合 3
1.2.2陰離子乳液的影響因素 4
1.2.3改性有機硅乳液的研究 5
1.3本課題的提出 6
2 實驗部分 7
2.1 主要原料和試劑 7
2.2 主要儀器和設備 7
2.3 實驗步驟 7
2.4樣品測試 8
2.4.1轉化率的測定 8
2.4.2分子量的測定 8
3 結果與討論 9
3.1陰離子乳液聚合機理 9
3.2 聚合溫度的影響 10
3.3 攪拌轉速的影響 10
3.4 鹽的影響 10
3.5 非離子乳化劑的影響 11
3.6 加鹽次序的影響 11
3.7 轉化率與時間的關系 12
3.8 應用效果 12
4總結與展望 13
致謝 14
參考文獻 15

摘 要：有機硅陰離子乳液聚合制備方法具有容易操作，合成產品配伍性、穩定性好等優點，近年來一直受到人們的密切關注。本文以八甲基環四硅氧烷（D4）為單體、十二烷基苯磺酸（DBSA）為陰離子乳化劑及催化劑、吐溫等為非離子乳化劑、鹽為流變改性劑，進行陰離子乳液聚合反應，制備高固含量有機硅陰離子乳液。在此基礎上，詳細討論了溫度、DBSA用量、非離子型乳化劑用量及種類、攪拌速度、鹽的用量等對聚合流變性和聚合速率的影響。并最終獲得高固含量有機硅陰離子乳液的優化工藝配方：30%D4，3%DBSA，1.1%司盤-80，1.1%鹽，64.8%水。聚合條件：攪拌轉速：300轉/min，溫度：80度，反應時間：4hr。

 關鍵詞：八甲基環四硅氧烷；十二烷基苯磺酸；高固含量；陰離子乳液

Abstract: The method of preparation of high solid content silicone anionic emulsion is easy to operate, synthesis product well compatibility, well stability. In recent years, we have been paying close attention to it. This article based octamethylcyclotetra siloxane (D4) as the monomer, duodenaryalkylbenzenesulfonic acid (DBSA) as anionic surfactant catalyst, Towin and other as non-ionic surfactant, salt as rheological modifier, then take the anionic polymerization reaction, and make the preparation of high solid content of anionic silicone emulsion. On this basis, The effects of temperature, DBSA dosage, nonionic emulsifier type, stirring speed, salt content on the rheological properties and polymerization reaction rate were discussed. And eventually acquire the optimization process of the polymerization of the high solid content of anionic silicone: 30%D4，3%DBSA，1.1% Towin，1.1%salt，64.8%water. Polymerization conditions: stirring speed: 300 rpm, temperature: 80°C, reaction time of polymerization: 4hr.
 Keywords：octamethylcyclotetrasiloxane; duodenaryalkylbenzenesulfonic acid; high solid content; anionic emulsion