钢表面防腐用的环氧型防腐涂料制备及性能研究

Preparation of water-based composite two-component epoxy anticorrosive coating for building and its anticorrosion application on steel surface

针对建筑钢结构表面防腐涂料耐腐蚀性能有待提高的问题,采用正交试验法制备一种水性复合双组份环氧型防腐涂料,并对涂料的性能进行评价。试验表明,水性复合双组份环氧涂料中,采用 A 组的配比为:水 25(wt)%、水性环氧乳液 40(wt)%、氧化铁红 11(wt)%、滑石粉 5(wt)%、硫酸钡 5(wt)%、云母粉 3(wt)%、三聚磷酸铝 5(wt)%、增稠剂 0.3(wt)%、润湿剂 0.1(wt)%、消泡剂 0.4(wt)%、分散剂 0.2(wt)%、纳米 Zn O0.3(wt)%;B 组分配比为水性环氧固化剂 10(wt)%、水 10(wt)%制备的水性复合双组份环氧型防腐涂料无硬块且分散均匀,涂膜外观正常,耐冲击性为 50cm,耐酸性(5% H_(2)SO_(4)溶液浸泡 96h 无异常)、耐碱性(5% Na OH溶液浸泡 7d 无异常)、耐盐水性(5% Na Cl 溶液浸泡 15d 无异常),均符合《JG/T224-2007 建筑用钢结构防腐涂料》国家行业标准,具有良好的耐腐蚀性和热稳定性。

Aiming at the problem that the corrosion resistance of anti -corrosion coatings on the surface of building steel structures needs to be improved, a waterborne composite two-component epoxy anti-corrosion coating was prepared by orthogonal test, and the performance of the coating was evaluated. The test results showed that the proportion of A in the waterborne composite two-component epoxy coatings was: water 25 (wt)%, waterborne epoxy emulsion 40(wt)%, iron oxide red 11(wt)%, talc powder 5(wt)%, barium sulfate 5(wt)%, mica powder 3(wt)%, aluminum triphosphate 5(wt)%, thickener 0.3(wt)%, wetting agent 0.1(wt)%, defoamer 0.4(wt)%, dispersant agent,0.2(wt)%, nano Zinc Oxide 0.3(wt)%, The waterborne composite two-component epoxy anticorrosive coating prepared with the distribution ratio of 10(wt)% of waterborne epoxy curing agent and 10(wt)% of water in group B has no hard block and uniform dispersion, normal film appearance, impact resistance of 50cm, acid resistance (no abnormality after soaking in 5% H_(2)SO_(4)solution for 96h), alkali resistance(no abnormality after soaking in 5% NaOH solution for 7days) The salt water resistance (no abnormality after immersion in 5% NaCl solution for 15days)meets the national industrial standard JG/T224-2007 anticorrosive coating for steel structures for buildings, and has good corrosion resistance and thermal stability.