纳米二氧化硅改性环氧树脂涂料因在树脂分子链中引入了 Si─O 柔性链段和富有弹性的网状硅氧四面体结构，使得涂层的柔韧性和附着力得到显著改善，防腐蚀性能提高。以纳米二氧化硅改性环氧涂料为底漆、丙烯酸聚氨酯涂料为面漆，应用于海南某高级酒店护栏的防护中，详细介绍了涂层体系的施工工艺，包括底材前处理、喷涂纳米二氧化硅改性环氧底漆、刮涂腻子层、喷涂丙烯酸聚氨酯面漆以及修补，测试了复合涂层的性能。结果表明，该复合涂层附着力1级，冲击强度≥50 kg·cm，柔韧性≤1 mm，硬度≥2H，耐盐雾腐蚀时间≥3000 h，耐人工加速老化时间≥1000 h。该涂层配套体系在酒店护栏上使用一年后，涂层无失光、变色等现象，显示出优异的防护性能和装饰性能。
The nano-SiO2 modified epoxy coating has improved flexibility, adhesion strength, and corrosion resistance due to the introduction of flexible Si─O chain segment and elastic mesh-like silicon–oxygen tetrahedron structure into the molecular chain of resin. In the paper, a nano-SiO2 modified epoxy coating as primer and an acrylic polyurethane as topcoat were applied to the protection of guardrails of a high-class hotel in Hainan. The construction process of the coating system was introduced in detail, including substrate pretreatment, spraying nano-SiO2 modified epoxy primer, puttying, spraying acrylic polyurethane topcoat, and finishing. The performance of the composite coating was tested as follows: adhesion strength 1-grade, impact strength ≥50 kg·cm, flexibility ≤1 mm, pencil hardness≥2H, salt spray corrosion resistance≥3 000 h, and artificially accelerated aging time≥1 000 h. The coating system which has been applied to guardrails of the hotel for one year does not loss luster and discolor, presenting excellent protective and decorative properties.
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