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摘要以异佛尔酮二异氰酸酯(IPDI)，聚己二酸1,4-丁二醇脂（PBA）和二羟甲基丙酸(DMPA)作为主要的原料，环氧树脂作为改性剂合成了水性聚氨酯分散液。利用红外光谱分析仪、粒径分析仪、热重分析仪等手段对乳液的稳定性、固含量、粘度、乳液粒径，涂膜的硬度、耐水性（吸水率）等性能进行了表征。正交实验法确定了R的最佳取值,DMPA、环氧树脂的用量。实验结果表明：n(-NCO):n(-OH)为1.5：1，DMPA用量为6%～7%，环氧树脂的用量为6%～8%时，乳液外观及稳定性好，涂膜力学性能、硬度、耐水及耐热性能得到很大提高。22677
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毕业论文关键词：聚氨酯分散体 环氧改性 性能
Title Preparation of waterborne polyurethane modified epoxy
Abstract
Waterborne polyurethane emulsion (WPU) was prepared from poly-1,4-butylene adipate glycol(PBA), isophorone diisocyanate (IPDI), 2,2-Dimethylol Propionic Acid (DMPA) , 1,4 - butanediol (BDO) and bisphenol A epoxy as a modifier, following a prepolymer mixing process. The stability,viscosity,particle size and solid content of the emulsion ,and the hardness and water resistance (water absorption) of the film were characterized by infrared spectroscopy (FT-IR),particle size analyzer and thermogravimetic analysis (TG). The article determined the best value of R and the best content of DMPA and epoxy resin by orthogonal experiment methods. The experimental results showed that the good emulsion appearance and stability, ideal film mechanical properties, hardness, water resistance and heat performance were obtained when the n(NCO): n(OH) was 1.5:1, the content of DMPA was 6%~7%, and 6% to 8% respectively.
Keywords : Polyurethane dispersion Epoxy-modified Performance
目 次
1 绪论 1
1.1 选题的科学意义和应用前景 1
1.2 水性聚氨酯 1
1.2.1 水性聚氨酯概述 1
1.2.2 水性聚氨酯的分类 2
1.2.3 改性水性聚氨酯的合成 2
2 实验部分 6
2.1 主要原料和仪器设备 6
2.2 水性聚氨酯的制备 7
2.2.1 聚氨酯预聚体的制备 8
2.2.2 对预聚体进行小分子扩链 8
2.2.3 对预聚体进行亲水扩链以及加入环氧树脂进行扩链亲水扩链 8
2.2.4 中和成盐 8
2.2.5 乳化和交联 8
2.2.6 膜的制备 9
3 产品分析与性能测试 9
3.1 乳液粘度的测定 10
3.2 乳液粒径的测定 10
3.3 乳液稳定性的测定 10
3.4 乳液耐水性（吸水率）的测定 10
3.5 乳液硬度的测定 10
3.6 乳液固含量的测定 10
3.7 FT-IR分析 11
3.8 —NCO含量的测定 11
4 结果与讨论 12
4.1 红外光谱跟踪分析反应过程 12
4.2 预聚体中的R值对水性聚氨酯的影响 13
4.3 环氧树脂的用量对水性聚氨酯的影响 14
4.4 DMPA用量对水性聚氨酯的影响 15