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A study on the properties and working mechanism of a waterborne polyurethane-modified silicate-based coating

机译：水性聚氨酯改性硅酸盐基涂料的性能与工作机理研究

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Herein, the effects of the amount of waterborne polyurethane, silica sol and fillers on the compressive and bending strength, temperature resistance and acid resistance of waterborne polyurethane-modified silicate-based coatings were investigated. The results indicated that the modified coating showed higher mechanical properties, impermeability and bonding properties when the amounts of polyurethane and silica sol were 10% and 4%, respectively. The room temperature strength, temperature resistance and acid resistance of the modified coating were 25.1%, 34.1% and 32.4% higher than those of unmodified coatings, respectively. Moreover, the flexibility of the coating was significantly improved. The compression–bend ratio of the modified coating was 7% higher than that of the unmodified coating. The impermeability of the modified coating was 53% higher than that of the unmodified coating. The bond strengths of the modified coatings with a concrete and an acid-resistant ceramic tile were 3.08 MPa and 5.84 MPa, respectively, which were higher than the standard value of 1.2 MPa. SEM analysis showed that the morphological structure of the coating was changed. The results showed that a dense micro-structure with an interpenetrating network was formed. EDS analysis showed that the sulfur atom was absent in the modified coating after acid storage. The MIP test showed that the porosity of the modified sample decreased and the pore distribution was improved. TGA analysis showed that the modified coating could meet the requirement of temperature resistance at 250 °C.
机译：在此，研究了水性聚氨酯，二氧化硅溶胶和填料的量对水性聚氨酯改性的硅酸盐基涂料的压缩和弯曲强度，耐热性和耐酸性的影响。结果表明，当聚氨酯和硅溶胶的含量分别为10％和4％时，改性涂料具有较高的机械性能，不渗透性和粘结性能。改性涂料的室温强度，耐温性和耐酸性分别比未改性涂料高25.1％，34.1％和32.4％。此外，涂层的柔韧性得到显着改善。改性涂层的压缩弯曲率比未改性涂层高7％。改性涂层的抗渗性比未改性涂层的抗渗性高53％。改性涂料与混凝土和耐酸瓷砖的结合强度分别为3.08 MPa和5.84 MPa，高于标准值1.2 MPa。 SEM分析表明涂层的形态结构发生了变化。结果表明，形成了具有互穿网络的致密微观结构。 EDS分析表明，酸贮藏后的改性涂层中不存在硫原子。 MIP测试表明，改性样品的孔隙率降低，孔分布得到改善。 TGA分析表明，改性涂层可以满足250℃耐温性的要求。

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