纯丙乳液的合成与实验.docx

HYPERLINK""摘要本论文采用种子乳液聚合方法及半连续乳液聚合方法，采用甲基丙烯酸甲酯（MMA）、丙烯酸丁酯（BA）为软硬单体组分，加入少量的自交联单体a-甲基丙烯酸（a-MAA），合成了聚丙烯酸酯乳液。探讨了软硬单体配比、乳化剂用量以及阴/非离子乳化剂配比、氨水用量、引发剂用量、pH值以及聚合工艺中反应温度、搅拌速度、反应时间等参数对纯丙乳液聚合稳定性、乳液性能及外观的影响，研制出最佳配方。结果表明，当w(乳化剂)=3%，w(引发剂)=0.5%，pH在7～8左右时，涂膜的吸水率达到9.65%，钙离子稳定性均通过测试，纯丙乳液具有较好的综合性能。并对共聚物的结构和乳液的性能进行表征：纯丙乳液的红外光谱（FTIR）测试结果表明丙烯酸酯类单体之间发生了自由基共聚反应；纯丙乳液XRD测试及分析表明纯丙乳液成膜后为非晶态物质。各项测试表明纯丙乳液贮存稳定。关键词：纯丙乳液；乳液聚合；最佳配方；性能测试；表征AbstractThesynthesisofpureacrylicemulsionwaspreparedbyseedslatexpolymerizationandstudiedbysemi-continuousemulsionpolymerization,adoptingmethylmethacrylate(MMA)assoftcomponentsandbutylacylate(BA)ashardmonomercomponents,andaddingalittleself-crosslinkingmonomerofa-methacrylicacid(a-MAA).Theeffectsoftheratioofsoftandhardmonomer,theratioandtheleverofemulsifiers,theleverofammoniasolution,theleverofinitiator,pHvalueandpolymerizationtemperature,stirringrate,reactiontimeandsooninthesystemonthestabilityofemulsionpolymerization,propertiesandappearanceoflatexarediscussed.Thenthebestformulasweremadeout.Theresultsshowedthatwhenemulsionwas3%,initiatatorwas(0.35%),PHvaluewasaround7～8,waterabsorbabilityreached9.65%,theemulsionhaveexcellentCa2+stability.Thepropertiesofpureacrylicemulsionandfilmsarediscussed.TheanalyzedresultsofFourierTransformInfraredSpectroscopy(FTIR)showthattheradicalcopolymerizationhashappenedamongthemonomers;theanalyzedresultsofX-RayDiffractomer(XRD)showthatthefilmofpureacrylicemulsionisamorphousmaterial.Alltestsindicatethelatexeshavegoodstability.Keywords:pureacrylicemulsion;emulsionpolymerization;thebestformula;testofproperty;characterization目录TOC\o"2-3"\h\z\t"标题1,1"第一章绪论---------------------------------------------------11.1前言11.2国内外纯丙乳液的研究现状与发展21.2.1纯丙乳液聚合中微量单体的引入21.2.2纯丙乳液乳化体系的研究进