CN109666925A - 金属材料表面超疏水二氧化锰涂层及其制备方法 - Google Patents
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Abstract
本发明公开一种超疏水二氧化锰涂层及其制备方法,属于金属材料表面处理领域,该方法以硫酸锰为原料,利用界面反应特性,采用简便快捷溶液浸渍法,在金属材料表面合成二氧化锰涂层,然后用硬脂酸疏水化处理后制得超疏水二氧化锰涂层,该涂层具有耐腐蚀、防蛋白质粘附、防细菌粘附等表/界面特性,具有广泛的应用前景。
Description
技术领域
本发明涉及金属材料表面处理领域,特别是涉及一种金属材料表面超疏水二氧化锰涂层及其制备方法。
背景技术
超疏水表面因其具有良好的自清洁、耐腐蚀、抗污损、抗菌等特性被广泛用于金属材料表面研究中。现在普遍公认的制备超疏水表面的策略为:1)在基材表面制备粗糙结构;2)采用可以降低表面能的物质进行表面修饰。目前制备超疏水表面的方法有刻蚀法、电化学沉积法、模板法、静电纺丝、溶胶-凝胶法、阳极氧化法、微弧氧化法、水热法等,这些方法均对实验设备有较高要求并且操作复杂,导致实际应用存在局限性。
二氧化锰被广泛应用于电极材料的制备,但将其应用于金属表面超疏水涂层制备研究未见报道。
发明内容
本发明的目的是提供一种金属材料表面超疏水二氧化锰涂层及其制备方法,该方法简便快捷、成本低,具有普适性。
为实现上述目的,本发明提供了如下方案:本发明提供一种金属材料表面超疏水二氧化锰涂层,原料包括如下组分:可溶性锰盐、高级脂肪酸和有机溶剂。
进一步地,所述可溶性锰盐为硫酸锰。
进一步地,所述高级脂肪酸为硬脂酸。
进一步地,所述有机溶剂为乙醇。
本发明还提供一种上述金属材料表面超疏水二氧化锰涂层的制备方法,以可溶性锰盐为原料,将二氧化锰沉积于金属材料上,高级脂肪酸溶于有机溶剂,进行疏水化处理后即得超疏水二氧化锰涂层。
进一步地,所述金属材料表面超疏水二氧化锰涂层的制备方法,包括以下步骤:
(1)金属材料预处理;
(2)将可溶性锰盐溶于去离子水中,将处理好的金属材料浸于可溶性锰盐溶液中,静置4-8h,取出,用去离子水洗净,干燥;
(3)将高级脂肪酸溶于有机溶剂中,取步骤(2)处理的金属材料浸入高级脂肪酸溶液中,静置3-6h,取出,用有机溶剂冲洗,烘干,即得金属材料表面超疏水二氧化锰涂层。
进一步地,所述金属材料预处理包括:将金属材料裁剪好,依次用400#、800#、1200#、2000#的SiC砂纸打磨至光滑,然后用依次用丙酮、无水乙醇、去离子水超声清洗5min去除金属表面杂质和油污,吹干。
进一步地,所述可溶性锰盐溶液浓度为0.01-0.1mol/L。
本发明公开了以下技术效果:
本发明利用金属材料的表面活性和界面反应特性,采用简便快捷的溶液浸渍法将二氧化锰涂层均匀沉积于金属表面,其反应如下:2M+nMn2++2nH2O=2Mn++nH2+nMn(OH)2,2Mn(OH)2+O2=2MnO2·H2O,其中二价锰离子在金属表面发生水解反应,生成Mn(OH)2,继而被空气中氧气氧化生成二氧化锰涂层。硬脂酸在溶液中失去质子后,成为荷负电的硬脂酸离子,在金属材料表面与二氧化锰涂层产生稳定的化学键合作用,赋予了涂层优良的疏水性能,涂层接触角大于150°。镁合金、不锈钢、铸铁等金属材料表面均可以制备该超疏水涂层。
二氧化锰是两性氧化物,具有[MnO2]八面体,氧原子在八面体角顶上,锰原子在八面体中,[MnO2]八面体共棱连接形成单链或双链,这些链和其它链共顶,形成空隙的隧道结构,八面体或成六方密堆积,或成立方密堆积;二氧化锰具有的特殊结构,可以使在金属材料表面与硬脂酸离子产生更稳定的键合作用,赋予了涂层优良的疏水性能。
本发明制备方法简便快捷、成本低,具有普适性,该涂层具有耐腐蚀、防蛋白质粘附、防细菌粘附等表/界面特性,具有广泛的应用前景。
具体实施方式
下面将结合本发明实施例,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
如本文所使用的术语“超疏水”指代超级疏水或者形成超级疏水的性质,即极其难以润湿。使用由固体基底表面上的液滴形成的稳定接触角作为特定固体的润湿能力的定量测定的概念也一直是熟知的。润湿是当使得液体与固体表面在一起时由于分子间相互作用产生的、液体维持与固体表面接触的能力。润湿的程度(可湿性)通过黏合力与内聚力之间的力的平衡来确定。如果水滴与基底表面的稳定接触角大于90°,则通常认为是疏水的。例如,存在液滴在其上具有高稳定接触角的材料,诸如石蜡上的水,对其而言稳定接触角为约107°。许多应用需要具有至少150°并且优选地至少158°的高稳定接触角的疏水涂层。这类涂层称为超疏水涂层。
实施例1
将金属材料裁剪好后,依次用400#、800#、1200#、2000#的SiC砂纸打磨至光滑平整,然后依次用丙酮、无水乙醇、去离子水超声清洗5min去除金属表面杂质和油污,吹干后备用;称取硫酸锰2.1128g,溶于250ml去离子水中,将预处理后的金属材料浸于配好的硫酸锰溶液中,静置4h,待表面气泡减少后取出,用去离子水冲洗干净后吹干;称取0.7112g硬脂酸溶于250ml无水乙醇中,将带有涂层的金属浸入硬脂酸溶液中,静置6h后取出,用无水乙醇冲洗,后60-80℃烘干5h,可得二氧化锰超疏水涂层,经检测,涂层静态接触角为158.4°,滚动角为7.6°。
实施例2
将金属材料裁剪好后,依次用400#、800#、1200#、2000#的SiC砂纸打磨至光滑平整,然后依次用丙酮、无水乙醇、去离子水超声清洗5min去除金属表面杂质和油污,吹干后备用;称取硫酸锰2.1128g,溶于250ml去离子水中,将预处理后的金属材料浸于配好的硫酸锰溶液中,静置6h,待表面气泡减少后取出,用去离子水冲洗干净后吹干;称取1.4224g硬脂酸溶于250ml无水乙醇中,将带有涂层的金属浸入硬脂酸溶液中,静置5h后取出,用无水乙醇冲洗,后60-80℃烘干4h,可得二氧化锰超疏水涂层,经检测,涂层静态接触角为162°,滚动角为8.2°。
实施例3
将金属材料裁剪好后,依次用400#、800#、1200#、2000#的SiC砂纸打磨至光滑平整,然后依次用丙酮、无水乙醇、去离子水超声清洗5min去除金属表面杂质和油污,吹干后备用;称取硫酸锰4.2255g,溶250ml去离子水中,将预处理后的金属材料浸于配好的硫酸锰溶液中,静置8h,待表面气泡减少后取出,用去离子水冲洗干净后吹干;称取0.7112g硬脂酸溶于250ml无水乙醇中,将带有涂层的金属浸入硬脂酸溶液中,静置3h后取出,用无水乙醇冲洗,后60-80℃烘干2h,可得二氧化锰超疏水涂层,经检测,涂层静态接触角为159.8°,滚动角为7.9°。
上述实施例涂层接触角检测方法和设备如下:
采用涂层接触角测量仪(德国Dataphysics接触角测量仪OCA15EC)进行检测,检测方法依据行业标准检测,其属于现有技术,为本领域技术人员应当得知的公知常识,且并非发明要点,在此不做赘述。
以上所述的实施例仅是对本发明的优选方式进行描述,并非对本发明的范围进行限定,在不脱离本发明设计精神的前提下,本领域普通技术人员对本发明的技术方案做出的各种变形和改进,均应落入本发明权利要求书确定的保护范围内。
Claims (8)
1.一种金属材料表面超疏水二氧化锰涂层,其特征在于,原料包括如下组分:可溶性锰盐、高级脂肪酸和有机溶剂。
2.根据权利要求1所述的金属材料表面超疏水二氧化锰涂层,其特征在于,所述可溶性锰盐为硫酸锰。
3.根据权利要求1所述的金属材料表面超疏水二氧化锰涂层,其特征在于,所述高级脂肪酸为硬脂酸。
4.根据权利要求1所述的金属材料表面超疏水二氧化锰涂层,其特征在于,所述有机溶剂为乙醇。
5.一种根据权利要求1-4任一项所述的金属材料表面超疏水二氧化锰涂层的制备方法,其特征在于,以可溶性锰盐为原料,将二氧化锰沉积于金属材料上,高级脂肪酸溶于有机溶剂,进行疏水化处理后即得金属材料表面超疏水二氧化锰涂层。
6.根据权利要求5所述的金属材料表面超疏水二氧化锰涂层的制备方法,其特征在于,包括以下步骤:
(1)金属材料预处理;
(2)将可溶性锰盐溶于去离子水中,将处理好的金属材料浸于可溶性锰盐溶液中,静置4-8h,取出,用去离子水洗净,干燥;
(3)将高级脂肪酸溶于有机溶剂中,取步骤(2)处理的金属材料浸入高级脂肪酸溶液中,静置3-6h,取出,用有机溶剂冲洗,烘干,即得超疏水二氧化锰涂层。
7.根据权利要求6所述的金属材料表面超疏水二氧化锰涂层的制备方法,其特征在于,所述金属材料预处理包括:将金属材料裁剪好,依次用400#、800#、1200#、2000#的SiC砂纸打磨至光滑平整,然后用依次用丙酮、无水乙醇、去离子水超声清洗5min去除金属表面杂质和油污,吹干。
8.根据权利要求6所述的金属材料表面超疏水二氧化锰涂层的制备方法,其特征在于,所述可溶性锰盐溶液浓度为0.01-0.1mol/L。
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