Spray-polymerization

喷雾聚合

• 批准号: 121937891
• 负责人: Professor Dr.-Ing. Urs Peuker
• 金额: --
• 依托单位: Institut für Mechanische Verfahrenstechnik und Aufbereitungstechnik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/121937891?language=en
• 关键词: Spray; polymerization

The vision of the SPP Process Spray is the evaluation of the interdependency of the fluid properties, spraying parameters and the properties of the synthesized powder. The process of spray-polymerization synthesizes a polymeric solid. The synthesis of the polymer form the monomer starts already within the spraying nozzle and is continued within the drop after atomization. The solid is formed due the reaction progress as well as due to the drying of the carrier solvent. In a one-step-process the process strategy combines the synthesis of the polymer with the design of the particle properties, which typically needs at least two independent steps. The spray polymerization is supposed to allow the synthesis of polymeric particles in the size range of 5-100 µm with specified particle properties. A special technical challenge here is the integrated crosslinking of the polymer. The state of technology has only limited options to produce defined polymeric particles in the size range from 1-50 µm. Emulsion- and suspension polymerization lead to compact dense spherical particles. The top-down approach by dry fine milling has severe problems in reaching a particle size below about 50 µm due to the elastic properties of the polymer material. A patent review shows a prove of principle for spray polymerization, but no quantitative data related to process design. The kinetic of the combined polymerization reaction and drying process is the main focus of experimental work in lab and pilot scale, it goes along with a theoretical description of the reaction. The technical realization also needs the development of a specialized technical components to control the start phase of the reaction. The layout of these components is strongly supported by lab scale characterization of the polymerization within an analytical rheometer, providing the relation of reaction progress and viscosity. The latter is the key property to ensure the application of the atomization process. The materials used are (neutralized) acrylic acid as monomer, which leads to particles of poly- -acrylic-acid sodium salt. This salt is synthezied either as linear polymer or as crosslinked gel. Furthermore it is also evaluated whether it is possible to crosslink existing polymer chains during spray polymerization.

SPP工艺喷涂的愿景是评估流体特性、喷涂参数和合成粉末特性之间的相互依赖性。 喷雾聚合的过程合成聚合物固体。聚合物从单体的合成已经在喷嘴内开始，并且在雾化后在液滴内继续。由于反应进程以及由于载体溶剂的干燥而形成固体。在一步法中，工艺策略将聚合物的合成与颗粒性质的设计相结合，这通常需要至少两个独立的步骤。喷雾聚合被认为允许合成具有特定颗粒性质的尺寸范围为5-100 μm的聚合物颗粒。这里的一个特殊技术挑战是聚合物的整体交联。目前的技术水平只能提供有限的选择来生产尺寸范围为1-50 µm的特定聚合物颗粒。乳液聚合和悬浮聚合导致致密的球形颗粒。由于聚合物材料的弹性性质，通过干法细磨的自上而下方法在达到低于约50 μm的粒度方面存在严重问题。 一项专利审查显示了喷雾聚合原理的证明，但没有与工艺设计相关的定量数据。聚合反应和干燥过程的动力学是实验室和中试规模实验工作的主要焦点，它与反应的理论描述沿着。该技术的实现还需要开发专门的技术部件来控制反应的起始阶段。这些组件的布局得到了分析流变仪内聚合的实验室规模表征的有力支持，提供了反应进程和粘度的关系。后者是保证雾化工艺应用的关键性能。使用的材料是（中和的）丙烯酸作为单体，这导致聚丙烯酸钠盐的颗粒。该盐可以作为线性聚合物或交联凝胶合成。此外，还评估了在喷雾聚合期间是否可能交联现有的聚合物链。