海洋用仿生疏水复合涂层的制备及其减阻性能研究
发布时间：2019-02-14 17:05
【摘要】：船舶与海洋平台等海洋结构物在海洋环境中工作时,难免受到腐蚀及海洋污损物的附着。海洋生物附着一方面会影响结构物的正常工作,增加上坞维护费用;另一方面会使自重增加,航行时摩擦阻力显著提高,增加燃油费用。通过涂覆仿生疏水复合涂层可以有效地抑制腐蚀及生物污损附着,且具备良好的减阻性能。仿生疏水复合涂层的制备主要有两点:一是低表面能;二是微观粗糙结构。因此,本文工作主要分为以下三部分:(1)CNT-OH/氟硅树脂仿生疏水复合涂层的制备及研究以氟硅树脂作为低表面能成膜物,以碳纳米管(CNT)为纳米填料来构建微观粗糙结构,通过对碳纳米管种类、含量的研究制备具备一定疏水性的CNTOH/氟硅树脂仿生疏水复合涂层。复合涂层的接触角、滚动角及表面能分别达到121°、21°、4.28m N/m;且具有一定耐盐雾腐蚀和疏水稳定性,在25d盐水浸泡试验后,复合涂层的接触角仍大于95°,吸水率为0.59%。其物理性能优良,铅笔硬度为5H,附着力为0级,且在320℃以下时具有较好的耐热稳定性。(2)CNT-OH/改性硅溶胶仿生疏水复合涂层的制备及研究利用正硅酸乙酯水解-凝胶法制备硅溶胶,并添加硅烷偶联剂六甲基二硅胺(HMDS)进行改性,制备得到了具备一定疏水性能的改性硅溶胶。将改性硅溶胶、CNT-OH、水及少量的丙烯酸树脂球磨机混合处理,喷涂后固化形成复合涂层。选用HMDS和1H,1H,2H,2H-全氟癸基三乙氧基硅烷(FTES)作为表面改性剂,制备得到CNT-OH/改性硅溶胶仿生疏水复合涂层。仿生复合涂层疏水自清洁性能优异,接触角/滚动角分别为145°/15°,表面能仅有0.595m N/m。25d盐水浸泡试验后,复合涂层的接触角仍大于122°,吸水率为0.37%。复合涂层具有良好的物理性能,其铅笔硬度为5H,附着力为0级,且在1000℃以下时具有良好的耐热稳定性,失重率仅有12%。制备最佳工艺条件为:硅溶胶:CNTOH=20:1,丙烯酸添加量为硅溶胶的30%,选用FTES作为表面改性剂,添加量0.8g(10ml乙醇中)、表面改性时间为2h。(3)平板阻力测试系统设计及仿生疏水复合涂层减阻性能研究自行设计小量程平板阻力测试系统,并在不同流速下进行了几种仿生疏水复合涂层的阻力性能测试。首先通过对阻力测试系统的标定,分析试验架平衡度和试验板重量对数据的重复性和稳定性的影响,并得到试验板受力与应变片的应变之间的线性关系,斜率为8.9227。随后对不同复合涂层进行阻力性能测试,相对于粗糙平板,市场购买的环氧漆涂层减阻率为5.2%,CNT-OH/氟硅树脂复合涂层减阻率为6.8%,CNT-OH/改性硅溶胶复合涂层减阻率为11.5%。复合涂层的减阻机理是涂层的低表面能性能及其表面存在微观粗糙结构共同作用的结果。
[Abstract]:When ships and offshore structures work in the marine environment, corrosion and fouling are inevitable. On the one hand, the attachment of marine organisms will affect the normal work of the structure and increase the cost of docking maintenance; on the other hand, it will increase the weight of the body, increase the friction resistance during navigation, and increase the fuel cost. The bionic hydrophobic composite coating can effectively inhibit corrosion and fouling adhesion and has good drag reduction performance. The preparation of bionic hydrophobic composite coating has two main points: one is low surface energy, the other is microstructure. Therefore, the work of this paper is divided into the following three parts: (1) preparation and study of CNT-OH/ fluorosilicone bionic hydrophobic composite coating with fluorosilicone resin as low surface energy film. The microstructure of carbon nanotubes (CNT) was constructed by using (CNT) as nano-filler. The hydrophobic composite coating of CNTOH/ fluorosilicone resin with certain hydrophobicity was prepared by studying the types and contents of CNTs. The contact angle, rolling angle and surface energy of the composite coating are 121 掳, 21 掳, 4.28 m / m respectively. After 25 days of salt water immersion test, the contact angle of the composite coating is still more than 95 掳, and the water absorption is 0.59%. Its physical properties are excellent, the hardness of pencil is 5H, the adhesion is 0, And it has good thermal stability at 320 鈩，
本文编号：2422419
[Abstract]:When ships and offshore structures work in the marine environment, corrosion and fouling are inevitable. On the one hand, the attachment of marine organisms will affect the normal work of the structure and increase the cost of docking maintenance; on the other hand, it will increase the weight of the body, increase the friction resistance during navigation, and increase the fuel cost. The bionic hydrophobic composite coating can effectively inhibit corrosion and fouling adhesion and has good drag reduction performance. The preparation of bionic hydrophobic composite coating has two main points: one is low surface energy, the other is microstructure. Therefore, the work of this paper is divided into the following three parts: (1) preparation and study of CNT-OH/ fluorosilicone bionic hydrophobic composite coating with fluorosilicone resin as low surface energy film. The microstructure of carbon nanotubes (CNT) was constructed by using (CNT) as nano-filler. The hydrophobic composite coating of CNTOH/ fluorosilicone resin with certain hydrophobicity was prepared by studying the types and contents of CNTs. The contact angle, rolling angle and surface energy of the composite coating are 121 掳, 21 掳, 4.28 m / m respectively. After 25 days of salt water immersion test, the contact angle of the composite coating is still more than 95 掳, and the water absorption is 0.59%. Its physical properties are excellent, the hardness of pencil is 5H, the adhesion is 0, And it has good thermal stability at 320 鈩，
本文编号：2422419
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