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| 苯乙烯-乙酸乙烯酯核壳乳液黏合剂的制备 摘要：以苯乙烯、乙酸乙烯酯为单体，通过乳液聚合制备苯乙烯-乙酸乙烯酯壳核结构黏合剂。研究了引发剂，反应温度，乳化剂，功能单体的用量对苯乙烯-乙酸乙烯酯壳核结构黏合剂的影响。 研究了利用聚苯乙烯大聚合单体和聚苯乙酸丙酯的接枝溶液聚合，结果显示，接枝聚合效率随着原料引发聚合剂的实际用量不断增大、聚合单体温度和小聚合单体温度投料比重的增大，随着聚合分子单体数量的减小增大而继续下降，随着聚合单体浓度的减小增大而继续下降，随着聚合单体浓度的减小增大而上升呈现出最大上升值。在生物共聚转化过程中，大转化单体进行转化后的速度比一开始比较小的转化单体快，后期大的转化单体速度较慢。苯乙烯与乙酸乙烯酯的乳液聚合物是粘稠剂共聚原料。采用原料为：以醋酸乙烯酯 vac 、苯乙烯 st 为聚合体，以聚乙烯醇 pva 为保护体，以 0p10 或 sds 为乳化剂，碳酸氢钠溶液作为缓冲剂，过硫酸锂溶液作为引发剂，防沉降剂作为 ot75 溶液，以丙烯酸乙酯 ea 、顺丁烯二酸酐 ma 或丙烯为溶液。酸丁酯 ba 是一种偶联物质。该工艺合成单纯，不仅减少了乳液生产费用，而且大大提高了乳液耐水性、抗热性等。[1]种子乳液的生物聚合利用发展过程是我们所谓的磷酸核壳种子乳液聚合发展过程。如果反应种子的核壳聚合与反应后继的种子聚合反应是不同粒子单体，则种子会连接形成两种具有不同核壳环状结构的粒子胶粒，并在与壳之间连接形成一层层粘接枝，从而大大增加两种粒子相容和力的粘接性，提高了粒子力学反应能力性能。聚合的处理关键在于控制乳化剂的浓度限量。正常核壳的聚合物有两类：一种是软壳硬，另一种是硬壳。核壳单体结构所受影响的主要因素除了两个核壳单体不同加料量的顺序外，还与一个核壳单体亲核疏水性密切相关。如果一个种子的细胞聚合与及其后继的细胞聚合种子是不同质的单体，则聚合形成了细胞核壳层状结构的种子胶粒，在细胞核和种子壳之间粘接形成了核粘接枝层，增加了种子两者之间的绝对相容和相互粘接性，提高了量子力学上的能量。聚合的成功与否关键在于产品限量剂和乳化剂的大量使用。 关键词：壳核结构 黏合剂 乳液聚合 苯乙烯 乙酸乙烯酯 Preparation of styrene - vinyl acetate shell - core structure adhesiveADHESIVE ABSTRACT: Styrene vinyl acetate shell structural adhesive was preparedby emulsion polymerization using styrene and vinyl acetate as monomers. The effects of initiator, reaction temperature,emulsifier and amount of functional monomer on the core shell structure adhesive of styrene vinyl acetate were studied. The graft solution polymerization of polystyrene macromonomer and propyl phenylacetate was studied.The results showed that the graft polymerization efficiency increased with the increase of theactual amount of initiator, the increase of monomer temperature and small monomer temperature,the decrease of monomer number and the decrease of monomer concentration It continued to decrease, and increased with the decrease of monomer concentration, showing a maximum upward appreciation. In the process of bioconversion,the transformation speed of large conversion monomer is faster than that of small conversion monomer at the beginning, and the transformation speed of large conversion monomer is slower at the later stage. The emulsion polymer of styrene and vinyl acetate isthe raw material of thickening agent copolymerization. The raw materials are: vinyl acetate VAC, styrene st as polymer,polyvinyl alcohol PVA as protector, 0p10 or SDS as emulsifier,sodium bicarbonate solution as buffer,lithium persulfate solution as initiator, anti settling agent as ot75 solution, ethyl acrylate EA, maleic anhydride Ma or propylene as solution. BA is a kind of coupling substance.The process is simple, which not only reduces the cost of emulsion production,but also greatly improves the water resistance and heat resistance of the emulsion. The development process of seed emulsion biopolymer is the development process of our so-called seeded emulsion polymerization of phosphate core shell. If the core-shell polymerization of the reaction seed and the subsequent seed polymerization reaction are different particle monomers,the seeds will connect to form two kinds ofparticle colloids with different core-shellring structure, and form a layer of adhesive graft between the two particles and the shell, so as to greatly increase the compatibility and adhesion of the two particles, and improve the mechanical reaction ability of the particles. The key of polymerization is to control the concentration limit of emulsifier.There are two kinds of normal core-shell polymers: one is soft shell, the other is hard shell.The main factors affecting the structure of core-shell monomers are not only the order oftwo core-shell monomers, but also the nucleophilic hydrophobicity of one core-shell monomer. If the cell polymerization of a seed and its subsequent cell polymerization seed are different monomers, the seed colloid particles with nuclear shell layer structure are formed by polymerization,and the nuclear adhesive graftlayer is formed between the nucleus and the seed shell, which increases the absolute compatibility and mutual adhesion between the two seeds and improves the energy of quantum mechanics. The key to the success of polymerization lies in theextensive use of limiting agent and emulsifier. Key words: Shell of nuclear Adhesive Emulsion polymerization styrene Vinyl acetate 目录 第一章 绪论 1 1.1 引言 1 1.2苯乙烯-乙酸乙烯酯壳核乳液的用途、性能及特点 1 1.3 苯乙烯-乙酸乙烯酯壳核乳液的研究进展 2 1.3.1 国内外关于苯乙烯-乙酸乙烯酯壳核乳液的研究及应用 2 1.3.2 课题的要求及意义 3 第二章 实验部分 4 2.1直接酯化法 4 2.2 乙醛缩合 4 2.3 乙醇催化脱氢法 4 2.4本次实验方案 5 2.4.1 药品与仪器 5 第三章 分析与讨论 6 3.1分析实验过程 6 3.2讨论实验结果： 7 3.3选取最优方法 7 第四章 结论 8 第五章 参考文献 9 第六章 致谢 10 |
