高性能慢固化聚脲成分

S. V. Romanov, O. A. Botvinova, E. A. Timakov, D. A. Rashchupkina, Y. T. Panov
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摘要

目标:通过研究天冬氨酸衍生物(AADs)在工艺和操作参数方面的变化,改进以聚碳二亚胺(聚脲)为基础的聚合物喷涂涂层技术。通过研究在成分中引入天冬氨酸衍生物(AADs)导致的工艺和操作参数的变化,改进基于聚卡二亚胺(聚脲)的聚合物喷涂涂层技术。喷涂和接触聚脲的生产过程存在许多困难,尤其是在组件和高压设备的成本方面。因此,使用数学模型来优化实验设计。在模拟的接近实际的条件下测量了组合物的固化时间。将 A 组份和 B 组份按预定比例进行恒温混合后,测量凝胶化时间,以表示组合物的固化时间。材料的硬度是根据 GOST 24621-91 用肖氏硬度法测定的。拉伸强度和相对伸长率根据标准方法(GOST 30436-96)测定。研究了三种 AAD 对成品聚脲性能的影响。研究发现,在聚脲中添加两种添加剂(AAD-1 和 AAD-2),且添加量不超过 40 wt %,可生产出慢速固化(大于 250 秒)的聚脲,并可进行手工涂抹。成品的物理性能与机器浇注的材料相当(断裂强度大于 73 兆帕;拉伸强度大于 23 兆帕;伸长率大于 500%)。利用编制的回归方程绘制了等高线图,显示了所研究成分的定向改性的可能区域。AAD 可用作聚脲体系的改性成分,以获得具有高性能的慢固化聚脲,这些性能可通过数学建模进行有目的的控制。由此生产出的产品兼具宝贵的物理和机械性能,因此具有商业价值。
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High-performance slow-curing polyurea compositions
Objectives. To improve the technology for obtaining polymer spray coatings based on polycarbodiimides (polyureas) by studying changes in the process and operational parameters due to the introduction of aspartic acid derivatives (AADs) into the composition.Methods. The process of the production of sprayed and contact polyureas involves a number of difficulties, not least in terms of the cost of the components and high-pressure equipment. For this reason, mathematical modeling was used to optimize experimental design. The curing time of the composition was measured under conditions simulated to be close to actual. After thermostating and mixing Components A and B in predetermined ratios, the gelation time was measured to represent the curing time of the composition. The hardness of the material was determined by the Shore method according to GOST 24621-91. Tensile strength and relative elongation were determined according to a standard method (GOST 30436-96).Results. The effect of three AADs on the properties of the finished polyurea was studied. It was found that the introduction of two of them (AAD-1 and AAD-2) into polyurea in an amount of up to 40 wt % produces slow-curing (>250 s) polyureas capable of manual application. The finished products have physical properties on par with machine-poured materials (breaking strength >73 MPa; tensile strength >23 MPa; elongation >500%). Compiled regression equations were used to construct graphs of equal levels showing the possible areas of directed modification of the studied compositions.Conclusions. AAD can be used as a modifying component for polyurea systems to obtain slow- curing polyureas with high performance properties, which can be purposefully controlled by mathematical modeling. The resulting products have commercial value due to their combination of valuable physical and mechanical properties.
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