环氧钢筋涂料的增韧探讨

Toughness Enhancement of Epoxy Resin-Based Anticorrosion Paints for Steel Reinforcing Bars

混凝土结构中的钢筋受外力作用会发生变形,由此而导致其防腐蚀涂层开裂,进而使钢筋发生腐蚀。对于室温固化的普通环氧钢筋涂料,由于其树脂交联度高,固化后脆性较大,必须增加树脂的韧性。通过拉伸试验考察了使用柔性环氧、增韧剂、长链聚酰胺等几种环氧涂料常用的增韧途径对涂料韧性的影响。结果表明,长链聚酰胺的掺入量是影响断裂伸长率的最重要因素,而柔性环氧树脂是影响抗张强度的最重要因素。通过钢筋的弯曲试验,最终确定采用添加柔性环氧的增韧方式。在此基础上,对涂料进行各种性能测试及实际使用,结果证明涂料能满足使用要求。

The reinforcing bars in concretes are liable to deformation in the presence of external forces, which leads to crack of the anticorrosion coating and corrosion of the reinforcing bars.With a view to the high degree of cross -linkage and high brittleness of conventional epoxy resin paints cured at ambient temperature, it is imperative to enhance the toughness of the epoxy resin-based anticorrosion coatings used for the steel reinforcing bars.Thus a series of stress-strain test and bending test were carried out to investigate the feasibility and efficiency to enhance the toughness of the epoxy resin-based anticorrosion paints for reinforcing bars by using flexible epoxy resin,toughening agent, and long chain polvamide.Results indicate that the dosage of long chain polvamide has the most important effect on the elongation at break of the epoxv resin-based anticorrosion paint, while the dosage of flexible epoxy resin has the most important effect on the tension strength of the paint.The best toughness -enhancement efficiency was reached along with the introduction of flexible epoxv resin, and the relevant anticorrosion coating showed satisfactory performance in service.