本文選題：水性　切入點：丙烯酸分散體　出處：《湖南大學(xué)》2010年碩士論文

【摘要】：本論文采用一步溶液聚合和兩步溶液聚合的方法合成了羥基丙烯酸樹脂,通過中和成鹽的方式制備了羥基丙烯酸水分散體。通過粒徑分布、熱儲穩(wěn)定性測試比較了兩種不同方法對羥基丙烯酸水分散體性能的影響。研究了制備過程中混合溶劑比例、中和劑的種類以及中和度對水分散體的黏度、粒徑、熱儲穩(wěn)定性的影響。本論文在新的羥基丙烯酸樹脂水分散體制備方法上有創(chuàng)新。 (1)本文利用自由基聚合原理,以苯乙烯(ST)、丙烯酸丁酯(n-BA)、甲基丙烯酸異冰片酯(IBOMA)、丙烯酸(AA)、甲基丙烯酸-β羥乙酯(p-HEA)為反應(yīng)單體,過氧化醋酸叔戊酯(TAPA)為引發(fā)劑,十二硫醇為鏈轉(zhuǎn)移劑,在丙二醇丁醚(PnB)溶劑中溶液聚合。采用一步加料和兩步加料分別制備了丙烯酸樹脂。兩步加料方式中前一步和后一步所用的原料種類相同,但親水性單體的質(zhì)量分數(shù)在后一步中比前一步高。通過對比分析一步聚合和兩步聚合制備的羥基丙烯酸水分散體的性能以及其對應(yīng)的涂膜性能的,發(fā)現(xiàn)兩步聚合制備的丙烯酸樹脂端羧基含量更高,相同中和度情況下,更多的羧基可被胺中和；且由兩步聚合樹脂中和分散后制備的丙烯酸水分散體比一步聚合的具有更均勻的粒徑分布、更好的熱儲穩(wěn)定性,其對應(yīng)的涂膜具有更好的耐水性能。優(yōu)選的兩步聚合制備的羥基丙烯酸水分散體具有以下性能：固含量為36%,黏度為2000-5000 mPa-s (23℃),平均粒徑為96.22nm,熱儲穩(wěn)定性為30天以上。將該羥基丙烯酸水分散體與固化劑以-NCO/-OH為1.5：1固化成膜,所得涂膜具有優(yōu)異的附著力、柔韌性、抗沖擊性,硬度2 H,光澤度90%及良好的耐水性。 (2)研究了丙二醇丁醚(PnB)和丙二醇甲醚醋酸酯(PMA)混合溶劑中不同PMA含量對水分散體黏度以及熱儲穩(wěn)定性的影響,確定了最佳的混合溶劑比：PMA/PnB= 2/3。分析了丙烯酸含量大小對水分散體的熱儲穩(wěn)定性的影響,實驗結(jié)果表明在一定的范圍內(nèi)羥基丙烯酸水分散體的熱儲穩(wěn)定性是隨著酸含量的增加而增加的。本文還研究了中和劑對水分散體的粒徑的影響,比較了N,N-二甲基乙醇胺(DMEA)、三乙胺以及DMEA:三乙胺1：1(摩爾比)三種中和劑對水分散體的粒徑、熱儲穩(wěn)定性的影響,實驗結(jié)果表明三乙胺作為中和劑比DMEA得到的水分散體的粒徑大,基于這一點,可考慮通過混合胺的比例來調(diào)節(jié)本分散體系的粒徑大小。比較分析了5種水分散體Zeta電位的大小以及熱儲穩(wěn)定性能,發(fā)現(xiàn)Zeta電位的絕對值越大其分散體系穩(wěn)定性越好的理論并不適用于本體系。
[Abstract]:In this paper, hydroxy acrylic resin was synthesized by one-step solution polymerization and two-step solution polymerization. Hydroxy acrylic acid aqueous dispersion was prepared by neutralization and salt formation. The effects of two different methods on the properties of hydroxy acrylic acid aqueous dispersions were studied. The ratio of mixed solvents, the type of neutralizer and the neutralization degree on the viscosity and particle size of the aqueous dispersions were studied. The effect of heat storage stability. In this paper, the preparation method of new hydroxy acrylic resin aqueous dispersion has been innovated. (1) in this paper, using the principle of free radical polymerization, the reactive monomers of styrene, butyl acrylate, isobornyl methacrylate (IBOMAA), acrylic acid (AA), 尾 -hydroxyethyl methacrylate (尾 hydroxyethyl methacrylate), and tert-amyl peroxide (TAPA) were used as initiators, and tert-amyl peroxide (TAPA) was used as initiator. Acrylic resin was prepared by solution polymerization of dodecyl mercaptan in propanediol butyl ether (PnB) solvent. Acrylic resin was prepared by one-step feeding and two-step feeding respectively. The type of raw materials used in the first step and the latter step in the two-step feeding method were the same. However, the mass fraction of hydrophilic monomer was higher in the latter step than in the first step. The properties of the hydroxy acrylic acid aqueous dispersion prepared by one-step polymerization and two-step polymerization and the corresponding film properties were analyzed. It was found that the content of carboxyl terminal of acrylic resin prepared by two-step polymerization was higher, and more carboxyl groups could be neutralized by amine at the same neutralization degree. The acrylic water dispersion prepared by neutralization of two-step polymerization resin has a more uniform particle size distribution and better thermal storage stability than that of one-step polymerization. The hydroxy acrylic acid aqueous dispersion prepared by two-step polymerization has the following properties: solid content is 36, viscosity is 2000-5000 mPa-s / m, average particle size is 96.22 nm, and storage stability is 30 days. The hydroxy acrylic acid aqueous dispersion and curing agent were solidified to form a film with -NCO / -OH as 1.5: 1, The film has excellent adhesion, flexibility, impact resistance, hardness 2 H, gloss 90% and good water resistance. The effects of different PMA contents on viscosity and thermal storage stability of aqueous dispersions in mixed solvents of propylene glycol butyl ether (PnB) and propylene glycol methyl ether acetate (PMA) were studied. The optimal ratio of mixed solvent to PMA / PnB = 2 / 3 was determined. The effect of acrylic acid content on the thermal storage stability of water dispersions was analyzed. The experimental results show that the thermal storage stability of hydroxy acrylic acid water dispersions increases with the increase of acid content in a certain range. The effect of neutralizer on the particle size of water dispersions is also studied in this paper. In this paper, the effects of three neutralizers, NN- dimethylethanolamine, triethylamine and DMEA: triethylamine 1: 1 (molar ratio) on the particle size and thermal storage stability of water dispersions were compared. The experimental results showed that triethylamine as neutralizer was larger than that obtained by DMEA. Based on this, the particle size of the dispersion system can be adjusted by the ratio of mixed amine. The Zeta potential of five kinds of water dispersions and the stability of heat storage can be compared and analyzed. It is found that the higher the absolute value of Zeta potential, the better the stability of the dispersion system.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2010
【分類號】：TQ316.33

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