羧酸鹽類共聚物分散劑的合成及其在吡蚜酮水懸浮劑中的應(yīng)用.pdf

1、論文題目：羧酸鹽類共聚物分散劑的合成及其在吡蚜酮水懸浮劑中的應(yīng)用學(xué)科專業(yè)：高分子化學(xué)與物理學(xué)位申請人：秦躍軍指導(dǎo)教師：任天瑞摘要本文以甲基丙烯酸、苯乙烯和丙烯酸羥丙酯為單體，經(jīng)自由基溶液聚合的方法合成了羧酸鹽類聚電解質(zhì)分散劑，并用于制備吡蚜酮水懸浮劑，評價了聚合物的結(jié)構(gòu)組成和化學(xué)性質(zhì)對水分散體系的影響。通過實驗室放大和中試實驗條件的研究，最終完成了2噸級工業(yè)化生產(chǎn)。用正交試驗設(shè)計的方法，考察了引發(fā)劑用量和單體比例對流點及懸浮率的影響，得

2、到最優(yōu)合成條件，并合成三元共聚物分散劑SRFl0。研究了凝膠色譜柱對水溶性共聚物的分離條件，結(jié)果表明：當(dāng)流動相為O3mol／LNaCl和O2mol／LPBS混合液，流速為O3m№in，柱溫為35℃時，分離效果最好。以聚丙烯酸鈉為標(biāo)準(zhǔn)品，測定了羧酸鹽類聚電解質(zhì)分散劑的平均相對分子質(zhì)量，并考察了各單體比例和引發(fā)劑用量對聚合物分子量的影響，結(jié)果表明：甲基丙烯酸的比例越高，共聚物的平均相對分子質(zhì)量越大，分子量分布越寬。用FT—lR和1H—NMR

3、確定了三元共聚物的結(jié)構(gòu)組成。為用作表面活性劑，測定了SRFlO的潤濕性、起泡性、臨界膠束濃度(114∥L，25℃)和親水親油平衡值(1447)。研究了潤濕分散劑用量與制劑黏度、粒徑和zeta電勢的關(guān)系。結(jié)果表明：當(dāng)分散劑用量約為6％時，25％吡蚜酮水懸浮劑的黏度最低，粒徑最小，Zeta電勢的絕對值最大。這說明，6％是分散劑的最適用量，此時分散劑在農(nóng)藥顆粒表面的吸附接近飽和狀態(tài)，粒子間的靜電排斥力達到最大值，體系的分散穩(wěn)定性最好。Abst

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