Thermally Sprayable Anti-corrosion Marine Coatings Based on MAH-g-LDPE/UHMWPE Nanocomposites
Thermally Sprayable Anti-corrosion Marine Coatings Based on MAH-g-LDPE/UHMWPE Nanocomposites
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DOI：
10.1007/s11666-014-0153-7
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发表时间：
2014-12-01
影响因子：
3.1
通讯作者：
Palanivelu, K.
中科院分区：
文献类型：
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作者：
Jothi, K. Jeeva;Santhoskumar, A. U.;Palanivelu, K.
以低密度聚乙烯（LDPE）和超高分子量聚乙烯（UHMWPE）共混物为基体，制备了用于船舶涂料的高分子复合涂料。采用马来酸酐（MAH）接枝改性LDPE/UHMWPE共混物，研究了MAH在LDPE/UHMWPE共混物中的接枝改性使用反应挤出工艺。当接枝率为5 wt.%时，马来酸酐。此外，MAH接枝的LDPE/UHMWPE共混物的纳米复合材料通过以1-4 wt.%的不同浓度掺入Clocolate 15 A纳米粘土来制备。使用低温研磨将聚合物纳米复合材料转化成适于热喷涂的细粉末，其具有千分之一货币符号200 μ粒度。采用热喷涂技术对喷砂处理后的低碳钢进行了耐磨性、结合强度和耐腐蚀性试验。采用盐雾技术和电化学阻抗谱研究了复合材料的耐腐蚀性能。涂层的耐磨性随UHMWPE含量的增加而提高。然而，具有较高浓度的UHMWPE的共混物导致具有差的粘附力的粗糙涂层。具有90：10 MAH接枝的LDPE/UHMWPE的涂层具有3重量%结果表明，纳米粘土具有良好的耐磨性、附着力和耐腐蚀性。
Polymer composite coatings based on low-density polyethylene (LDPE) and ultra-high-molecular-weight polyethylene (UHMWPE) blends were prepared for marine coatings. The incorporation of carboxyl moiety in the polymer blends of LDPE/UHMWPE was carried out by grafting with maleic anhydride (MAH) at varying concentrations of 1-8 wt.% using reactive extrusion process. An optimum percentage of grafting of 2.1% was achieved with 5 wt.% of maleic anhydride. Further, the nanocomposites of MAH-grafted-LDPE/UHMWPE blends were prepared by incorporating cloisite 15A nanoclay at varying concentrations of 1-4 wt.%. The polymer nanocomposites were converted into fine powders suitable for thermal spray having a parts per thousand currency sign200 mu particle size using cryogenic grinding. The effect of the intact coatings applied on grit-blasted mild steel by thermal spray technique was evaluated for abrasion resistance, adhesion strength, and corrosion resistance. The corrosion resistance of the polymer nanocomposites was studied by salt spray technique and Electrochemical Impedance Spectroscopy The abrasion resistance of coatings increases with increasing UHMWPE content in the blends. However, blends with higher concentration of UHMWPE resulted in coarse coatings with poor adhesion. The coatings with 90:10 MAH-grafted-LDPE/UHMWPE having 3 wt.% of nanoclay showed good abrasion resistance, adhesion strength, and better corrosion resistance.