CN117304752A - 一种耐腐蚀不锈钢彩涂板及其制备方法 - Google Patents
一种耐腐蚀不锈钢彩涂板及其制备方法 Download PDFInfo
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- CN117304752A CN117304752A CN202311259614.7A CN202311259614A CN117304752A CN 117304752 A CN117304752 A CN 117304752A CN 202311259614 A CN202311259614 A CN 202311259614A CN 117304752 A CN117304752 A CN 117304752A
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- stainless steel
- coating
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Classifications
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Abstract
本申请公开了一种耐腐蚀不锈钢彩涂板,包括基板,所述基板的正反面均涂覆有钝化层;所述基板的正面由内往外依次还包括第一氟碳PVDF面漆层、阻断层、自修复层和第二氟碳PVDF面漆层;所述基板的反面由内往外依次还包括耐酸底漆层、阻断层和环氧白灰背漆层。本申请通过设置钝化层、面漆层、自修复层和阻断层,既能提高一般使用状态下的防腐性能,也能在板材正面受到损伤时,实现有效阻断腐蚀性介质的渗入,同时能够具备一定的自修复能力,适用范围广,耐腐蚀性和持久性强。
Description
技术领域
本申请涉及一种耐腐蚀不锈钢彩涂板及其制备方法,属于金属材料镀覆技术领域。
背景技术
在建筑、制造业和户外设备等领域中,使用耐腐蚀、装饰性能优良的材料变得越来越重要。特别是在恶劣气候和环境条件下,材料的抗腐蚀性和持久性成为了关键考量因素。不锈钢板由于其优异的抗腐蚀性和机械性能,已经成为广泛使用的材料之一。然而,即使是不锈钢,在特定环境条件下仍然会受到腐蚀的影响,例如长期暴露在户外环境中。为了进一步增强不锈钢的耐腐蚀性和装饰性能,涂层技术被广泛应用。
在已有技术中,涂层技术被广泛用于提高材料的耐腐蚀性和装饰性。例如,热镀锌、电镀、喷涂等方法都用于在金属表面形成一层保护层。然而,现在的不锈钢彩涂板在运输或在使用过程中产生划伤或擦痕后,腐蚀性的气体或者液体进入孔隙,会逐渐腐蚀钢板,最后造成整体板材的损坏。
中国专利CN107385427A-不锈钢彩涂钢板中公开了三种不锈钢彩涂钢板,主要是通过钝化层和底漆面漆的配合实现一定的防腐性能。但其在受到损伤后防腐性能会明显下降,不适宜长期户外使用。
发明内容
为了解决上述问题,提供了一种耐腐蚀不锈钢彩涂板及其制备方法,通过设置钝化层、面漆层、自修复层和阻断层,既能提高一般使用状态下的防腐性能,也能在板材正面受到损伤时,实现有效阻断腐蚀性介质的渗入,同时能够具备一定的自修复能力,适用范围广,耐腐蚀性和持久性强。
根据本申请的一个方面,提供了一种耐腐蚀不锈钢彩涂板,包括基板,所述基板的正反面均涂覆有钝化层;所述基板的正面由内往外依次还包括第一氟碳PVDF面漆层、阻断层、自修复层和第二氟碳PVDF面漆层;所述基板的反面由内往外依次还包括耐酸底漆层、阻断层和环氧白灰背漆层。
可选地,所述钝化层为涂覆水基铬化物后烘干而成,涂覆烘干后基板表面水基铬化物含量25-35mg/m2。
可选地,所述第一氟碳PVDF面漆层和第二氟碳PVDF面漆层均是由氟碳树脂和纳米颜料混合制备而成。
具体地,按照重量份数计,所述第一氟碳PVDF面漆层包括氟碳树脂100份和第一纳米颜料20份;所述第一纳米填料包括纳米钛白粉和纳米锶铬黄防锈颜料,重量比为2:1;所述纳米填料中,20%-50%的纳米填料粒径小于500nm,50%-80%的纳米填料的粒径为1000nm;漆膜厚度为6μm;
按照重量份数计,所述第二氟碳PVDF面漆层包括氟碳树脂100份和第二纳米颜料20份;所述第二纳米填料包括纳米钛白粉、纳米酞菁蓝和纳米DPP红颜料,重量比为2:1:2;所述纳米填料中,10%-60%的纳米填料粒径小于500nm,40%-90%的纳米填料的粒径为1000nm;漆膜厚度为20μm。
可选地,按照重量份数计,所述阻断层包括聚酰亚胺面漆10-15份、氨基硅烷改性碳纤维3-5份和纳米片状氧化铝3-5份复配涂覆而成。
可选地,所述氨基硅烷改性碳纤维的制备方法为先将碳纤维在400-450℃下处理1-2h,再使用氨基硅烷改性液在40-60℃下浸渍40-60min,最后在120-140℃下烘干2-3h后即得。
具体地,阻断层的厚度为12μm,自修复层的厚度为20μm。
具体地,按照重量份数计,氨基硅烷改性液是由10份3-氨基丙基三甲氧基硅烷和100份乙醇混合而成。
具体地,将碳纤维高温氧化处理后,氨基硅烷中间体硅醇与碳纤维表面的羟基、羰基发生缩合反应,氨基硅烷分子通过强劲的Si-O-C键附着到碳纤维表面,在纤维表面构建出含大量氨基的层状结构,氨基通过与纳米氧化铝发生界面反应,将纳米氧化铝吸附固定在碳纤维表面。
可选地,按照重量份数计,所述自修复层包括聚硅氮烷树脂40-60份、纳米二氧化硅10-20份和自修复微胶囊5-8份涂覆而成。
可选地,所述自修复微胶囊由二乙烯三胺、乙二醇二缩水甘油脂、环氧氯丙烷、聚氨酯预聚物和六亚甲基二异氰酸酯制备而成,重量比为(1-2):(1-3):(1-2):(2-4):(1-3)。
可选地,所述自修复微胶囊的制备方法为先将二乙烯三胺和环氧氯丙烷混合形成第一混合液,再将乙二醇二缩水甘油脂和聚氨酯预聚物混合搅拌形成第二混合液,将第一混合液缓慢滴加到入第二混合液中,最后加入六亚甲基二异氰酸酯搅拌,离心洗涤干燥后即得。
具体地,乙二醇二缩水甘油脂和聚氨酯预聚物混合搅拌的具体参数为500rpm,搅拌30min,第一混合液滴加速率为2mL/min,搅拌速率800rpm,40℃,搅拌1h,加入固化剂六亚甲基二异氰酸酯后温度保持40℃,搅拌速率600rpm,搅拌2h,再升温到60℃反应3h,离心用纯水洗涤后干燥即得。
具体地,自修复微胶囊的壳材由聚氨酯预聚物和二异氰酸酯形成,它们可在界面发生交联反应生成聚氨酯网络结构的胶囊壳层。核相含有二乙烯三胺修复物质和环氧氯丙烷溶剂,二乙烯三胺分子中含有两个亚胺基(-NH)反应活性中心。自修复层含有类似核壳结构的自修复微胶囊,核心为修复物质,壳为聚合物壳层。当涂层表面受到划痕或损伤,微胶囊会发生破裂释放出修复物质二乙烯三胺,同时释放的环氧氯丙烷溶剂使二乙烯三胺容易渗入划痕处,二乙烯三胺逐步与树脂发生交联,划痕处的自修复涂层逐渐愈合,实现自我修复,随着时间的延长,修复效果越来越好。
根据本申请的另一方面,还提供了一种上述耐腐蚀不锈钢彩涂板的制备方法,包括以下步骤:
a.预处理:以不锈钢钢板为基板,进行脱脂清洗;
b.初涂:基板进入化学涂机,正反面涂覆水基铬化物后烘干形成钝化层,再进入辊涂机正面依次涂覆烘干形成第一氟碳PVDF面漆层、阻断层和自修复层;反面依次涂覆烘干形成耐酸底漆层和阻断层;
c.精涂:初涂后的基板进入精涂机,正面涂覆烘干形成第二氟碳PVDF面漆层,反面涂覆烘干形成环氧白灰背漆层,即得。
具体地,不锈钢钢板成分为C-0.055%~0.065%、Si-0.28%~0.38%、Mn-1.457%~1.635%、P-0.030%~0.040%、S-0.003%~0.005%、Ni-8.056%~9.088%、Cr-18.201%~19.325%以及Fe和其他不可控制元素。
具体地,脱脂清洗温度控制在55±10℃,清洗液pH值控制范围12-14。
初涂:经过预处理之后的基板进入到化学涂机,表面涂一层水基铬化物,出化学涂机后进入烘干炉烘干,烘干温度70-90℃,烘干时间为5min,布置在炉后的冷风干燥机将带钢冷却到40℃以下,进入辊涂机进行初涂;
正面、背面涂覆完成后进入悬垂式固化炉烘干,烘干温度220-240℃,烘干时间为35秒,出固化炉后进入水淬槽,再通过冷风烘干;
精涂:正面、背面涂完后进入精涂的固化炉将油漆烘干,烘干温度为245-260℃,烘干时间为35秒,出炉后再进入水淬槽冷却,然后烘干。
本申请的有益效果包括但不限于:
1.根据本申请的耐腐蚀不锈钢彩涂板,通过设置钝化层并限定水基铬化物含量,提高了其他涂层的附着力;设置第一氟碳PVDF面漆层及第二氟碳PVDF面漆层,能够与基板表面牢固结合,涂层被烘干后,氟碳树脂中的分子将通过化学键与基板和彼此相连,形成一个紧密的网状结构;纳米颜料的添加不仅可以提供所需的颜色和装饰性能,还可以通过分散在树脂中的纳米颗粒,增加涂层的耐久性和颜色稳定性。
2.根据本申请的耐腐蚀不锈钢彩涂板,通过设置阻断层,增加涂层整体的附着性和耐腐蚀性,在板面出现损伤时,有效防止腐蚀性物质渗透到涂层下面,为自修复层修复争取时间,有效阻止和减缓腐蚀介质的渗透;
聚酰亚胺面漆和氨基硅烷改性碳纤维的结合,一方面氨基硅烷改性碳纤维中的氨基硅烷基团能够与涂层中的聚合物分子发生交联反应,从而增强了涂层与基板之间的附着力,使得涂层不易剥离或脱落,延长了涂板的使用寿命;另一方面氨基硅烷改性碳纤维通过增强涂层的韧性,可以减缓涂层受损后的裂纹扩展速率,这在面对外界冲击或划伤时,有助于防止涂层内部缺陷的进一步扩展,同时与纳米氧化铝发生界面反应,将纳米氧化铝吸附固定在碳纤维表面,片板状的纳米氧化铝在碳纤维表面形成细密排列的叠片结构,发挥物理阻隔作用;聚酰亚胺树脂与改性碳纤维发生机械锁结,将阻隔结构整体固定,形成致密的阻隔涂层,三者的协同作用,既提供了机械强度,又构建了阻隔结构,防腐渗透性能好。
3.根据本申请的耐腐蚀不锈钢彩涂板,通过设置自修复层,聚硅氮烷树脂作为自修复层的主体树脂,高温下生成硅氮骨架网状结构,提供了自修复层必要的机械强度和内聚力,保证涂层的完整性;采用纳米二氧化硅起到填充和增强效果,当涂层发生微小损伤时,纳米二氧化硅颗粒可以渗入损伤区域,填充其中的微小裂缝和孔隙,有助于防止涂层中的进一步损伤扩展,此外,纳米二氧化硅还能够增强涂层的机械性能,使其更加耐用;自修复微胶囊内部包含有自修复剂,当涂层受损,微胶囊会破裂释放自修复剂,从而填补损伤区域,减少损伤的扩展和进一步恶化。
4.根据本申请的耐腐蚀不锈钢彩涂板的制备方法,通过采用初涂、精涂等工艺并限定参数,有助于确保涂层的均匀性、附着力和持久性,从而提高涂板的整体性能。
具体实施方式
下面结合实施例详述本申请,但本申请并不局限于这些实施例。
除非另行定义,文中所使用的所有专业与科学用语与本领域熟练人员所熟悉的意义相同。本发明所使用的试剂或原料均可通过常规途径购买获得,如无特殊说明,本发明所使用的试剂或原料均按照本领域常规方式使用或者按照产品说明书使用。此外,任何与所记载内容相似或均等的方法及材料皆可应用于本发明方法中。本专利中所述的较佳实施方法与材料仅作示范之用。
本申请中采用的聚硅氮烷树脂,型号DS-3001,粘度(25℃,cps)为800,密度(g/cm3)为1.25。
实施例1彩涂板1#
耐腐蚀不锈钢彩涂板包括基板,基板的正反面均涂覆有钝化层;基板的正面由内往外依次还包括第一氟碳PVDF面漆层、阻断层、自修复层和第二氟碳PVDF面漆层;基板的反面由内往外依次还包括耐酸底漆层、阻断层和环氧白灰背漆层。
钝化层为涂覆水基铬化物后烘干而成,涂覆烘干后基板表面水基铬化物含量30mg/m2。第一氟碳PVDF面漆层和第二氟碳PVDF面漆层均是由氟碳树脂和纳米颜料混合制备而成。按照重量份数计,第一氟碳PVDF面漆层包括氟碳树脂100份和第一纳米颜料20份;第一纳米填料包括纳米钛白粉和纳米锶铬黄防锈颜料,重量比为2:1;纳米填料中50%的纳米填料粒径小于500nm,50%的纳米填料的粒径为1000nm;漆膜厚度为6μm;
按照重量份数计,第二氟碳PVDF面漆层包括氟碳树脂100份和第二纳米颜料20份;第二纳米填料包括纳米钛白粉、纳米酞菁蓝和纳米DPP红颜料,重量比为2:1:2;纳米填料中60%的纳米填料粒径小于500nm,40%的纳米填料的粒径为1000nm;漆膜厚度为20μm。
按照重量份数计,阻断层包括聚酰亚胺面漆12份、氨基硅烷改性碳纤维4份和纳米片状氧化铝4份复配涂覆而成。
氨基硅烷改性碳纤维的制备方法为先将碳纤维在400-450℃下处理2h,再使用氨基硅烷改性液在50℃下浸渍50min,最后在130℃下烘干2h后即得。阻断层的厚度为12μm,自修复层的厚度为20μm。按照重量份数计,氨基硅烷改性液是由10份3-氨基丙基三甲氧基硅烷和100份乙醇混合而成。按照重量份数计,自修复层包括聚硅氮烷树脂50份、纳米二氧化硅15份和自修复微胶囊6份涂覆而成。自修复微胶囊由二乙烯三胺、乙二醇二缩水甘油脂、环氧氯丙烷、聚氨酯预聚物和六亚甲基二异氰酸酯制备而成,重量比为1:2:1:3:2。
自修复微胶囊的制备方法为先将二乙烯三胺和环氧氯丙烷混合形成第一混合液,再将乙二醇二缩水甘油脂和聚氨酯预聚物混合搅拌形成第二混合液,将第一混合液缓慢滴加到入第二混合液中,最后加入六亚甲基二异氰酸酯搅拌,离心洗涤干燥后即得。乙二醇二缩水甘油脂和聚氨酯预聚物混合搅拌的具体参数为500rpm,搅拌30min,第一混合液滴加速率为2mL/min,搅拌速率800rpm,40℃,搅拌1h,加入固化剂六亚甲基二异氰酸酯后温度保持40℃,搅拌速率600rpm,搅拌2h,再升温到60℃反应3h,离心用纯水洗涤后干燥即得。
耐腐蚀不锈钢彩涂板的制备方法包括以下步骤:
a.预处理:以不锈钢钢板为基板,进行脱脂清洗;脱脂清洗温度控制在55℃,清洗液pH值为12。
b.初涂:基板进入化学涂机,正反面涂覆水基铬化物后烘干形成钝化层,再进入辊涂机正面依次涂覆烘干形成第一氟碳PVDF面漆层、阻断层和自修复层;反面依次涂覆烘干形成耐酸底漆层和阻断层;
经过预处理之后的基板进入到化学涂机,表面涂一层水基铬化物,出化学涂机后进入烘干炉烘干,烘干温度80℃,布置在炉后的冷风干燥机将带钢冷却到40℃以下,进入辊涂机进行初涂;正面、背面涂覆完成后进入悬垂式固化炉烘干,烘干温度230℃,出固化炉后进入水淬槽,再通过冷风烘干;
c.精涂:初涂后的基板进入精涂机,正面涂覆烘干形成第二氟碳PVDF面漆层,反面涂覆烘干形成环氧白灰背漆层,即得;正面、背面涂完后进入精涂的固化炉将油漆烘干,烘干温度为250℃,出炉后再进入水淬槽冷却,然后烘干。
实施例2彩涂板2#
耐腐蚀不锈钢彩涂板包括基板,基板的正反面均涂覆有钝化层;基板的正面由内往外依次还包括第一氟碳PVDF面漆层、阻断层、自修复层和第二氟碳PVDF面漆层;基板的反面由内往外依次还包括耐酸底漆层、阻断层和环氧白灰背漆层。
钝化层为涂覆水基铬化物后烘干而成,涂覆烘干后基板表面水基铬化物含量25mg/m2。第一氟碳PVDF面漆层和第二氟碳PVDF面漆层均是由氟碳树脂和纳米颜料混合制备而成。按照重量份数计,第一氟碳PVDF面漆层包括氟碳树脂100份和第一纳米颜料20份;第一纳米填料包括纳米钛白粉和纳米锶铬黄防锈颜料,重量比为2:1;纳米填料中50%的纳米填料粒径小于500nm,50%的纳米填料的粒径为1000nm;漆膜厚度为6μm;
按照重量份数计,第二氟碳PVDF面漆层包括氟碳树脂100份和第二纳米颜料20份;第二纳米填料包括纳米钛白粉、纳米酞菁蓝和纳米DPP红颜料,重量比为2:1:2;纳米填料中60%的纳米填料粒径小于500nm,40%的纳米填料的粒径为1000nm;漆膜厚度为20μm。
按照重量份数计,阻断层包括聚酰亚胺面漆10份、氨基硅烷改性碳纤维3份和纳米片状氧化铝3份复配涂覆而成。
氨基硅烷改性碳纤维的制备方法为先将碳纤维在420℃下处理1h,再使用氨基硅烷改性液在40℃下浸渍60min,最后在120℃下烘干3h后即得。阻断层的厚度为12μm,自修复层的厚度为20μm。按照重量份数计,氨基硅烷改性液是由10份3-氨基丙基三甲氧基硅烷和100份乙醇混合而成。按照重量份数计,自修复层包括聚硅氮烷树脂60份、纳米二氧化硅10份和自修复微胶囊5份涂覆而成。自修复微胶囊由二乙烯三胺、乙二醇二缩水甘油脂、环氧氯丙烷、聚氨酯预聚物和六亚甲基二异氰酸酯制备而成,重量比为2:1:1:2:1。
自修复微胶囊的制备方法为先将二乙烯三胺和环氧氯丙烷混合形成第一混合液,再将乙二醇二缩水甘油脂和聚氨酯预聚物混合搅拌形成第二混合液,将第一混合液缓慢滴加到入第二混合液中,最后加入六亚甲基二异氰酸酯搅拌,离心洗涤干燥后即得。乙二醇二缩水甘油脂和聚氨酯预聚物混合搅拌的具体参数为500rpm,搅拌30min,第一混合液滴加速率为2mL/min,搅拌速率800rpm,40℃,搅拌1h,加入固化剂六亚甲基二异氰酸酯后温度保持40℃,搅拌速率600rpm,搅拌2h,再升温到60℃反应3h,离心用纯水洗涤后干燥即得。
耐腐蚀不锈钢彩涂板的制备方法包括以下步骤:
a.预处理:以不锈钢钢板为基板,进行脱脂清洗;脱脂清洗温度控制在55℃,清洗液pH值为13。
b.初涂:基板进入化学涂机,正反面涂覆水基铬化物后烘干形成钝化层,再进入辊涂机正面依次涂覆烘干形成第一氟碳PVDF面漆层、阻断层和自修复层;反面依次涂覆烘干形成耐酸底漆层和阻断层;
经过预处理之后的基板进入到化学涂机,表面涂一层水基铬化物,出化学涂机后进入烘干炉烘干,烘干温度70℃,布置在炉后的冷风干燥机将带钢冷却到40℃以下,进入辊涂机进行初涂;正面、背面涂覆完成后进入悬垂式固化炉烘干,烘干温度220℃,出固化炉后进入水淬槽,再通过冷风烘干;
c.精涂:初涂后的基板进入精涂机,正面涂覆烘干形成第二氟碳PVDF面漆层,反面涂覆烘干形成环氧白灰背漆层,即得;正面、背面涂完后进入精涂的固化炉将油漆烘干,烘干温度为245℃,出炉后再进入水淬槽冷却,然后烘干。
实施例3彩涂板3#
耐腐蚀不锈钢彩涂板包括基板,基板的正反面均涂覆有钝化层;基板的正面由内往外依次还包括第一氟碳PVDF面漆层、阻断层、自修复层和第二氟碳PVDF面漆层;基板的反面由内往外依次还包括耐酸底漆层、阻断层和环氧白灰背漆层。
钝化层为涂覆水基铬化物后烘干而成,涂覆烘干后基板表面水基铬化物含量35mg/m2。第一氟碳PVDF面漆层和第二氟碳PVDF面漆层均是由氟碳树脂和纳米颜料混合制备而成。按照重量份数计,第一氟碳PVDF面漆层包括氟碳树脂100份和第一纳米颜料20份;第一纳米填料包括纳米钛白粉和纳米锶铬黄防锈颜料,重量比为2:1;纳米填料中50%的纳米填料粒径小于500nm,50%的纳米填料的粒径为1000nm;漆膜厚度为6μm;
按照重量份数计,第二氟碳PVDF面漆层包括氟碳树脂100份和第二纳米颜料20份;第二纳米填料包括纳米钛白粉、纳米酞菁蓝和纳米DPP红颜料,重量比为2:1:2;纳米填料中60%的纳米填料粒径小于500nm,40%的纳米填料的粒径为1000nm;漆膜厚度为20μm。
按照重量份数计,阻断层包括聚酰亚胺面漆15份、氨基硅烷改性碳纤维5份和纳米片状氧化铝5份复配涂覆而成。
氨基硅烷改性碳纤维的制备方法为先将碳纤维在450℃下处理2h,再使用氨基硅烷改性液在60℃下浸渍40min,最后在140℃下烘干2h后即得。阻断层的厚度为12μm,自修复层的厚度为20μm。按照重量份数计,氨基硅烷改性液是由10份3-氨基丙基三甲氧基硅烷和100份乙醇混合而成。按照重量份数计,自修复层包括聚硅氮烷树脂60份、纳米二氧化硅10份和自修复微胶囊8份涂覆而成。自修复微胶囊由二乙烯三胺、乙二醇二缩水甘油脂、环氧氯丙烷、聚氨酯预聚物和六亚甲基二异氰酸酯制备而成,重量比为2:3:2:4:3。
自修复微胶囊的制备方法为先将二乙烯三胺和环氧氯丙烷混合形成第一混合液,再将乙二醇二缩水甘油脂和聚氨酯预聚物混合搅拌形成第二混合液,将第一混合液缓慢滴加到入第二混合液中,最后加入六亚甲基二异氰酸酯搅拌,离心洗涤干燥后即得。乙二醇二缩水甘油脂和聚氨酯预聚物混合搅拌的具体参数为500rpm,搅拌30min,第一混合液滴加速率为2mL/min,搅拌速率800rpm,40℃,搅拌1h,加入固化剂六亚甲基二异氰酸酯后温度保持40℃,搅拌速率600rpm,搅拌2h,再升温到60℃反应3h,离心用纯水洗涤后干燥即得。
耐腐蚀不锈钢彩涂板的制备方法包括以下步骤:
a.预处理:以不锈钢钢板为基板,进行脱脂清洗;脱脂清洗温度控制在55℃,清洗液pH值为14。
b.初涂:基板进入化学涂机,正反面涂覆水基铬化物后烘干形成钝化层,再进入辊涂机正面依次涂覆烘干形成第一氟碳PVDF面漆层、阻断层和自修复层;反面依次涂覆烘干形成耐酸底漆层和阻断层;
经过预处理之后的基板进入到化学涂机,表面涂一层水基铬化物,出化学涂机后进入烘干炉烘干,烘干温度90℃,布置在炉后的冷风干燥机将带钢冷却到40℃以下,进入辊涂机进行初涂;正面、背面涂覆完成后进入悬垂式固化炉烘干,烘干温度240℃,出固化炉后进入水淬槽,再通过冷风烘干;
c.精涂:初涂后的基板进入精涂机,正面涂覆烘干形成第二氟碳PVDF面漆层,反面涂覆烘干形成环氧白灰背漆层,即得;正面、背面涂完后进入精涂的固化炉将油漆烘干,烘干温度为260℃,出炉后再进入水淬槽冷却,然后烘干。
对比例1对比彩涂板1#
对比例1与实施例1的不同之处在于:对比彩涂板1#中没有阻断层。
对比例2对比彩涂板2#
对比例2与实施例1的不同之处在于:对比彩涂板2#中没有自修复层。
对比例3对比彩涂板3#
对比例3与实施例1的不同之处在于:对比彩涂板3#阻断层中采用的为普通碳纤维。
对比例4对比彩涂板4#
对比例4与实施例1的不同之处在于:对比彩涂板4#阻断层中采用的为普通纳米氧化铝。
对比例5对比彩涂板5#
对比例5与实施例1的不同之处在于:对比彩涂板5#自修复层中没有自修复胶囊。
对比例6对比彩涂板6#
对比例6与实施例1的不同之处在于:对比彩涂板6#自修复层中未采用聚硅氮烷树脂,采用聚氨酯树脂代替。
实验例
按照GB/T12754、GB/T13448对彩涂板1#-3#和对比彩涂板1#-6#的正面进行测试,其中根据盐雾腐蚀条件进行划痕耐腐蚀测试,划痕压力约为3N,划痕速度约为20mm/s,划痕长度约为40mm。划痕数量:在每个样品上制作3条平行划痕,保证结果可重复性。具体实验数据如表1所示。
表1彩涂板1#-3#和对比彩涂板1#-6#性能测试
由上述数据可知,采用本申请所限定的材料和方法制备得到的彩涂板1#-3#常规使用下具备优异的耐腐蚀性能,在受到划痕损伤时候,具备一定的自修复阻断腐蚀能力,仍可保持良好的耐腐蚀性能,耐腐蚀时间长。
对比彩涂板1#中未采用本申请的阻断层,最终数据表明其具备一定的耐腐蚀能力,但在损伤后腐蚀速度快,耐腐蚀时间短;对比彩涂板2#中未采用本申请的自修复层,最终数据表明其具备一定的耐腐蚀能力,但在损伤后腐蚀速度快,耐腐蚀时间短;对比彩涂板3#中采用的为未改性的普通碳纤维,最终数据表明其在损伤后耐腐蚀时间较短,分析原因为未改性的碳纤维不能与基体树脂和纳米片状氧化铝反应,难以有效阻隔腐蚀介质的渗透;对比彩涂板4#中采用的为普通微球纳米氧化铝,最终数据表明其在损伤后耐腐蚀时间较短,分析原因为微球纳米氧化铝存在空隙,与改性碳纤维接触面积有限,难以有效阻断腐蚀介质渗透;对比彩涂板5#中无自修复胶囊,最终数据表明其在损伤后耐腐蚀时间较短;对比彩涂板6#中采用聚氨酯树脂代替聚硅氮烷树脂,最终数据表明其在损伤后耐腐蚀时间较短,分析原因为聚氨酯树脂无法与改性碳纤维连接固定,涂层整体性能受影响。
以上所述,仅为本申请的实施例而已,本申请的保护范围并不受这些具体实施例的限制,而是由本申请的权利要求书来确定。对于本领域技术人员来说,本申请可以有各种更改和变化。凡在本申请的技术思想和原理之内所作的任何修改、等同替换、改进等,均应包含在本申请的保护范围之内。
Claims (10)
1.一种耐腐蚀不锈钢彩涂板,其特征在于,包括基板,所述基板的正反面均涂覆有钝化层;
所述基板的正面由内往外依次还包括第一氟碳PVDF面漆层、阻断层、自修复层和第二氟碳PVDF面漆层;所述基板的反面由内往外依次还包括耐酸底漆层、阻断层和环氧白灰背漆层。
2.根据权利要求1所述的耐腐蚀不锈钢彩涂板,其特征在于,所述钝化层为涂覆水基铬化物后烘干而成,涂覆烘干后基板表面水基铬化物含量25-35mg/m2。
3.根据权利要求1所述的耐腐蚀不锈钢彩涂板,其特征在于,所述第一氟碳PVDF面漆层和第二氟碳PVDF面漆层均是由氟碳树脂和纳米颜料混合制备而成。
4.根据权利要求1所述的耐腐蚀不锈钢彩涂板,其特征在于,按照重量份数计,所述阻断层包括聚酰亚胺面漆10-15份、氨基硅烷改性碳纤维3-5份和纳米片状氧化铝3-5份复配涂覆而成。
5.根据权利要求4所述的耐腐蚀不锈钢彩涂板,其特征在于,所述氨基硅烷改性碳纤维的制备方法为先将碳纤维在400-450℃下处理1-2h,再使用氨基硅烷改性液在40-60℃下浸渍40-60min,最后在120-140℃下烘干2-3h后即得。
6.根据权利要求1所述的耐腐蚀不锈钢彩涂板,其特征在于,按照重量份数计,所述自修复层包括聚硅氮烷树脂40-60份、纳米二氧化硅10-20份和自修复微胶囊5-8份涂覆而成。
7.根据权利要求6所述的耐腐蚀不锈钢彩涂板,其特征在于,所述自修复微胶囊由二乙烯三胺、乙二醇二缩水甘油脂、环氧氯丙烷、聚氨酯预聚物和六亚甲基二异氰酸酯制备而成,重量比为(1-2):(1-3):(1-2):(2-4):(1-3)。
8.根据权利要求1所述的耐腐蚀不锈钢彩涂板,其特征在于,所述自修复微胶囊的制备方法为先将二乙烯三胺和环氧氯丙烷混合形成第一混合液,再将乙二醇二缩水甘油脂和聚氨酯预聚物混合搅拌形成第二混合液,将第一混合液缓慢滴加到入第二混合液中,最后加入六亚甲基二异氰酸酯搅拌,离心洗涤干燥后即得。
9.一种如权利要求1-8中任一所述耐腐蚀不锈钢彩涂板的制备方法,其特征在于,包括以下步骤:
a.预处理:以不锈钢钢板为基板,进行脱脂清洗;
b.初涂:基板进入化学涂机,正反面涂覆水基铬化物后烘干形成钝化层,再进入辊涂机正面依次涂覆烘干形成第一氟碳PVDF面漆层、阻断层和自修复层;反面依次涂覆烘干形成耐酸底漆层和阻断层;
c.精涂:初涂后的基板进入精涂机,正面涂覆烘干形成第二氟碳PVDF面漆层,反面涂覆烘干形成环氧白灰背漆层,即得。
10.根据权利要求9所述的制备方法,其特征在于,步骤b中钝化层烘干温度为70-90℃,初涂后烘干温度为220-240℃;
步骤c中精涂后烘干温度为245-260℃。
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