砂浆表面自愈丙烯酸涂层的制备与性能研究

Preparation and Performance of Self-healing Acrylic Coatings Applied on Mortar Surfaces

摘要:

通过正交试验法，探究丙烯酸酯单体配合比及功能基团对丙烯酸涂层性能及水泥基材料防护效果的影响。采用傅里叶红外光谱（FTIR）和拉曼光谱等表征手段，同时结合接触角、附着力及抗氯离子渗透等测试，评估不同配方丙烯酸涂层的综合性能。结果表明：引入脲基后丙烯酸涂层与砂浆表面形成氢键，附着力增强并赋予其自修复能力；在50 ℃下干燥20 min后丙烯酸涂层试样划痕完全愈合，接触角高达106.3°，附着力最大值为4.4 MPa； 甲基丙烯酸亚乙基脲乙氧基酯和甲基丙烯酸甲酯协同作用可有效降低氯离子的渗透。

Abstract:

The effects of acrylate monomer ratios and functional groups on the performance of acrylic coatings and their protective effectiveness on cement-based materials were investigated using an orthogonal experiment. Characterization techniques such as Fourier-transform infrared spectroscopy （FTIR） and Raman spectroscopy were employed， along with measurements of contact angle， adhesion strength， and chloride ion penetration resistance to evaluate the overall performance of different acrylic coating formulations. The results show that the introduction of urea groups enables the formation of hydrogen bonds between the acrylic coating and the mortar surface， thereby enhancing adhesion and imparting self-healing capability to the coating. After drying at 50 ℃ for 20 min， scratches on the acrylic coating samples are completely healed， with the highest contact angle reaching 106.3° and a maximum adhesion strength of 4.4 MPa. The synergistic effect of 2-（2-oxo-1-imidazolidinyl）ethyl methacrylate and methyl methacrylate effectively reduce chloride ion penetration.