【作者】 陈佳；

【导师】 杜军；

【作者基本信息】 重庆大学 ， 化学， 2015， 硕士

【摘要】 随着人类文明的进步和科技日新月异的发展,人们对江河湖海等地表水资源的利用愈加广泛。地表水源泵作为一种有效利用可再生能源和低品位热能的技术,在环境和能源问题的推动下得到飞快的发展与运用。但同地表水长时间接触的地表水源热泵换热器管道表面会被地表水严重腐蚀,缩短其使用寿命。腐蚀破坏大多是由水垢沉积、水体锈蚀、微生物繁殖等多种复杂因素共同造成的。管道腐蚀是目前许多国家都面临并急需解决的重大问题之一,为此人们广泛采取涂层这一行之有效的保护措施,如环氧树脂涂层。环氧树脂对化学介质的稳定性较好,填料在其中分散性好,且可与各类助剂有较好的互溶性,是目前防腐蚀领域应用最多的成膜物质。但是,环氧树脂防腐性能仍有较大提升空间,疏水性能差,在镀锌板上的附着力一般,耐冲击性能较差,从而影响其在水体中的耐腐蚀性及其对水中管道的防护效果。可以通过添加合适的填料对环氧树脂各方面性能加以改善,提高其防腐、防污等性能。本实验先利用硅烷偶联剂KH560改性Ce O2,用FESEM研究了KH560改性前后Ce O2的形貌变化和其在环氧树脂中的分散情况,并用紫外漫反射光谱和拉曼光谱等试验探索改性前后Ce O2对提高环氧树脂防腐性能的作用机理。本实验选用改性后Ce O2和Si O2作为涂料的填料,利用化学改性、超声波和高速机械搅拌等方式将两种填料均匀地分散到环氧树脂中,并通过响应面法—中心复合试验设计确定了固体填料在涂料中的添加量,制备出一种防腐防污涂料;对涂层硬度、附着力、耐冲击性等基本性能进行测试,利用交流阻抗研究涂层的耐蚀性能,利用接触角测量仪测试涂层的疏水性及表面能,研究涂层的防污性能。实验结果表明,表面改性的Ce O2在环氧树脂基体中具有更好的分散性;所制备的改性后Ce O2/环氧树脂复合涂层对镀锌板附着力达到1级;电化学防腐性能测试实验中其在3.5wt%Na Cl溶液中浸泡30 min阻抗值在109Ω·cm2以上,浸泡7 d阻抗值基本保持在107Ω·cm2左右,高于未改性的Ce O2制备的复合材料和普通环氧树脂材料。改性后Ce O2和Si O2添加到环氧树脂中制备的稀土防腐防污涂层的最优配方为:E44环氧树脂70 g,改性后Ce O22.5 g,Si O214 g,固化剂42 g。此时,涂层硬度2 H,附着力1级,耐冲击强度50 kg·cm;在3.5wt%Na Cl溶液中浸泡10天,涂层的电阻仍在108Ω·cm2以上,防腐蚀性能优异;涂层与水接触角在90°以上,表现出较好的疏水性能,涂层防污性能提升明显。更多还原

【Abstract】 With the increasing of human civilization and rapid development of technology, people show more interesting in utilizing surface water such as river water or lake water. Surface water–source pump are widely developed and applied in many fields in the giant motivational effect of pollution and energy crisis an effective technology in utilizing renewable resource and low grade heat energy. However, the surface of water-source heat pump heat exchanger pipe will be suffered severe corrosion affected by the joint influence of complicated factors of scale–forming, rusting and harmful algae microorganisms blooming in the long time contact with water, which cut down its service life and has been turn into one of the main issues urgently need to be solved among lots of countries. Generally, epoxy resin coating, as the most frequently used substances of film-forming, are chose to protect pipe from corrosion for the excellent properties of chemical stability, good dispersion with filler and solubility with organic solvents. While, the anticorrosive properties and hydrophobicity of epoxy resin coating still remains to be improved by adding suitable fillers. It also needs better adhesive force and impact resistance to protecting the pipe from corrosion.The silane coupling agent KH560 is selected as a modifier of the Ce O2. The impact of coupling agent on microstructure of composites was investigated by Raman, UV-vis DRS and FESEM. Ce O2 and Si O2 are selected as coating fillers in the experiment, two fillers were dispersed into the epoxy by the way of chemical modification, ultrasonic dispersed and mechanical stirring combination to prepare a kind of anti-corrosion and anti-fouling coating. The content of two fillers in the coating was determined by RSM-CCD. Hardness, adhesion force and impact resistance test method for the routine performance of the coatings were characterized. The electrochemical corrosion behavior of coating was measured by CHI660 D electrochemical workstation respectively. Surface water contact angle and surface energy of coatings were measured to study on the performance of water-based antifouling.The experimental results show that the coupling agent improved the interaction between Ce O2 and epoxy. Both the fraction of Ce O2 and KH560 had effect on adhesive force and corrosion resistance. The adhesive force of the composite with treated Ce O2 on galvanized steel was one grade, its electrochemical impedance was 109 Ω·cm2 at immersion in 3.5wt% Na Cl solution after 30 minutes and about 107 Ω·cm2 after 7 days. It was higher than that with untreated Ce O2 and epoxy resin. The research of my paper get the results that the optimal formulation of epoxy coating: the E44 epoxy resin70 g, treated Ce O2 2.5 g, Si O2 14 g, curing agent 42 g. Preferred formula preparation anti-corrosion and anti-fouling coating performance test results are as follows: the hardness of 2 H, the adhesive force on galvanized steel of one grade, the impact resistance of 50 kg·cm. Its electrochemical impedance was 108 Ω·cm2 above at immersion in 3.5wt% Na Cl solution after 10 days and the contact angle of water against it to be 90 ° above, the basic and hydrophobic properties of coating are good. We also see the anti-corrosion and anti-fouling performance increasing.更多还原