水工结构聚脲防渗涂层的力学性能与寿命预测研究

Study on durability and life prediction of polyurea composite anti-seepage coatings

聚脲防渗涂层材料力学性能的耐久性对保障水工结构工程长久安全运行意义重大,目前缺乏考虑聚脲材料化学构成对防渗涂层使用寿命预测的理论及公式。本研究基于聚脲材料化学键构成、水解老化机理及Arrhenius老化模型,考虑聚脲材料的脲键、氨酯键含量的影响,提出了聚脲防渗涂层的老化寿命预测理论及公式,该理论能够反映不同聚脲材料的氨酯键、脲键含量与水解老化寿命的关系。根据聚脲防渗涂层中氨酯键、脲键含量定义了聚脲涂层力学性能,通过湿热加速老化试验确定了氨酯键水解老化参数,确保了聚脲材料寿命预测公式的可靠性。实现了在不同温湿度运行环境条件下,不同聚脲防渗材料的使用寿命预测及材料设计方法,对水工建筑物聚脲防渗涂层的设计及应用具有指导意义。

The durability of the material mechanical properties of the polyurea anti-seepage coatings is of great significance for ensuring the long-lasting and safe operation of the hydraulic structures.At present,there is no theory and formulas for predicting the service life of anti-seepage coatings considering the chem ical composition of polyurea material.Based on the chemical composition of the polyurea coatings,hydroly sis aging mechanism and the Arrhenius equations,this paper proposed the service life prediction theory and formulas of the polyurea coatings,which considers the content of urea and urethane bonds.This theory reflects the relationship between urea bonds,urethane bonds and hydrolysis aging in polyuria coatings.This theory proposed that the mechanical properties of polyurea coatings are defined by the ratio of urethane bonds and urea bonds.The humidity and temperature accelerated aging testing was performed to determine the urethane bonds aging parameters in the service life prediction formula,and ensure the reliability of the aging theory parameters of polyurea materials.This theory could realized the prediction of the service life and design method of the polyurea coatings under different running environment conditions.This theory has guiding significance for the design and application of polyurea coatings of hydraulic structures.