有压热闷渣微粉对环氧涂料的性能影响

Effect of pressed-heat and stuffy slag powder on the properties of epoxy coating

以有压热闷渣为研究对象,采用超细立式粉磨机处理有压热闷渣形成微粉,利用有压热闷渣微粉替代传统防腐填料与环氧树脂、二甲苯、正丁醇及聚酰胺形成有压热闷渣/环氧复合防腐涂料.根据《色漆和清漆摆杆阻尼试验》(GB/T 1730—2007)、《漆膜划圈试验》(GB/T 1720—2020)、《色漆和清漆耐磨性的测定旋转橡胶砂轮法》(GB/T 1768—2006)、《漆膜、腻子膜柔韧性测定法》(GB/T 1731—2020)测定涂层的硬度、附着力、耐磨性、柔韧性,《色漆和清漆耐中性盐雾性能》(GB/T 1771—2007)与《漆膜吸水率测定法》(HG/T 3344—2012)测定涂层的耐盐雾性能及吸水率.采用接触角测量仪、精密阻抗测试仪和电化学工作站测定涂层的接触角、阻抗模量和腐蚀电位.采用扫描电子显微镜、X射线荧光光谱仪、X射线衍射仪和激光粒度分析仪测试微观形貌、化学成分、矿物组成和粒度分布.研究有压热闷渣微粉对环氧复合防腐涂料涂层力学性能、防腐性能的影响,及其作用机理.结果表明有压热闷渣的主要矿物成分C_(3)S、C_(2)S、Ca(OH)_(2)、C_(2)F、RO相和f-CaO等,其具有硅酸盐特性可以提高耐久性.利用超细立式粉磨机对有压热闷渣进行加工,有利于f-CaO矿化,减小颗粒粒径、增大比表面积.当有压热闷渣微粉的粒径均匀度为2.240,其添加量为5%时有压热闷渣/环氧复合防腐涂料涂层的性能最佳,即摆杆硬度测试结果为115.75 s、附着力为3级、磨损量最小、柔韧性为4 mm、阻抗模量为10^(6.1)Ω·cm^(2)、腐蚀电位E为0.143 V.有压热闷渣微粉作为一种刚性粒子,将其加入环氧涂料体系中,一方面可以改善涂层的硬度、耐摩擦、力学等性能,另一方面合理的粒径均匀度可以增强涂层的密实度,提升防腐性能.开启有压热闷渣在非建材领域高值化利用的新途径,实现钢铁行业“以废增效”、涂料行业“以废降本”的目的.

The study focused on the utilization of heat-pressed and stuffy slag,processed into an ultrafine vertical grinding mill.This pressed-heat and stuffy slag powder replaced traditional anticorrosion fillers,such as epoxy resin,xylene,butanol,and polyamide,therefore forming a composite anticorrosion coating.Tests were conducted to assess the hardness,adhesion,abrasion resistance,and flexibility of these coatings according to various standards:GB/T 1730—2007(paints and varnishes-pendulum damping test),GB/T 1720—2020(circle-drawing test of coating films),GB/T 1768—2006(paints and varnishes-determination of resistance to abrasionrotating abrasive rubber wheel method),and GB/T 1731—2020(determination of flexibility of coating and putty films),respectively.Additionally,the salt mist resistance was tested in conformance with GB/T 1771—2007(paints and varnishes-determination of resistance to neutral salt spray)and water absorption was evaluated consistent with HG/T 3344—2012(determination of water absorption of paint film)for coatings.The contact angle,impedance modulus,and corrosion potential of the coatings were also determined using a contact angle measuring instrument,a precision impedance tester,and an electrochemical workstation.Moreover,the micromorphology,chemical composition,mineral composition,and particle size distribution were evaluated using electron microscopy,X-ray spectroscopy,X-ray diffraction,and laser particle size analysis,respectively.The research analyzed the impact of pressed-heat and stuffy slag powder on the mechanical properties and anticorrosive properties of the epoxy composite anticorrosion coatings.It found that the pressed-heat and stuffy slag consisted of C_(3)S,C_(2)S,Ca(OH)_(2),C_(2)F,RO phase,and f-CaO possessed properties similar to silicate,thereby improving durability.The processing method using an ultrafine vertical grinding mill facilitated the mineralization of f-CaO,reducing particle size and increasing specific surface area.The study concluded that the optimal performance of heat-pressed and stuffy slag powder/epoxy composite anticorrosion coatings was achieved when the particle size uniformity was 2.240 and the addition rate was 5%.At this rate,the performance of the composite anticorrosion coating is the best,the average swing rod hardness test result is 115.75 s,adhesion reached level 3,wear was minimized,flexibility measured 4 mm,impedance modulus was 10^(6.1)Ω·cm^(-2),and corrosion potential(E)was 0.143 V.In summary,heat-pressed and stuffy slag,a type of rigid particle,can improve the hardness,friction resistance,and mechanical properties of the epoxy coating system.A uniform particle size can enhance the denseness and anticorrosive properties of these coatings.This opens up new possibilities for the high-value utilization of pressed-heat and stuffy slag outside of building materials and fulfilling the dual purpose of“increasing efficiency with waste”in the steel industry and“reducing cost with waste”in the paint industry.