【摘要】：涂料保護是防止金屬腐蝕的最重要與最經(jīng)濟的手段之一,研制高防腐性能的涂料具有十分重要的意義,而在涂料中添加納米材料提高涂層的性能是當(dāng)代涂料發(fā)展的重要方向。本論文通過超聲波輔助球磨法制備了環(huán)氧樹脂表面接枝改性的納米氫化鈦顆粒,通過X射線衍射、粒徑測試、透射電鏡、紅外光譜與熱重分析等方法對超聲球磨產(chǎn)物的結(jié)構(gòu)與性能進行表征。在此基礎(chǔ)上,將改性納米氫化鈦添加到環(huán)氧涂料中制備了納米復(fù)合涂料,對其性能進行測試,并且研究了改性納米氫化鈦的添加量對涂層性能的影響。(1)優(yōu)化了球磨轉(zhuǎn)速、球料比與球磨時間等工藝參數(shù)。得到的最佳工藝參數(shù)為：球磨轉(zhuǎn)速650r/min,球料比20:1和球磨時間10h。(2)超聲球磨產(chǎn)物的結(jié)構(gòu)與性能表征表明,改性納米氫化鈦顆粒的平均粒徑約為80nm,并且顆粒分散較均勻；超聲球磨法可實現(xiàn)環(huán)氧樹脂在納米顆粒的表面接枝,表面接枝的位置位于環(huán)氧基團附近,環(huán)氧樹脂的表面接枝率約為6.54%;表面接枝改性提高了納米顆粒在環(huán)氧樹脂溶液中的分散穩(wěn)定性。通過無球磨作用的超聲波輻照、無超聲波作用的攪拌球磨以及超聲波輔助球磨的對比試驗可知,只有超聲波輔助球磨工藝,即超聲波與機械力的耦合作用才能實現(xiàn)環(huán)氧樹脂在納米顆粒表面的接枝改性。(3)表面改性處理提高了納米顆粒在涂層中的分散穩(wěn)定性以及納米顆粒與環(huán)氧基體之間的界面相容性,從而減少了界面缺陷與腐蝕性介質(zhì)的擴散通道,顯著提高涂層的致密度與耐腐蝕性。(4)通過比較不同添加量的涂層的力學(xué)性能與耐腐蝕性能可知,當(dāng)改性納米氫化鈦的添加量低于5wt%時,涂層的性能隨著添加量的增大而顯著提高；當(dāng)添加量高于5wt%時,添加量的增大會導(dǎo)致納米顆粒的部分團聚,反而使涂層性能變差。實驗結(jié)果表明,5wt%TiH2/環(huán)氧樹脂納米復(fù)合涂層具有最佳的綜合性能。(5)添加改性納米氫化鈦顆�？商岣咄繉拥男阅�,首先是因為表面改性處理改善了納米顆粒與環(huán)氧基體的界面相容性與界面結(jié)合力,提高了涂層的致密度和抗腐蝕性；其次均勻分散的納米顆�？商钛a涂料固化時產(chǎn)生的結(jié)構(gòu)微孔,隔絕被保護金屬基底與外界相連的通道；另外納米顆粒增加了腐蝕性介質(zhì)擴散通道的曲折程度,延緩了腐蝕過程。
[Abstract]:Coating protection is one of the most important and economical means to prevent metal corrosion. It is of great significance to develop coatings with high anticorrosive properties. Adding nano-materials to coatings to improve the performance of coatings is an important direction in the development of contemporary coatings. In this paper, nano-titanium hydride particles modified by surface grafting of epoxy resin were prepared by ultrasonic assisted ball milling. X-ray diffraction, particle size measurement, transmission electron microscopy (TEM) were used. The structure and properties of ultrasonic ball milling products were characterized by infrared spectroscopy and thermogravimetric analysis. On this basis, nano-composite coatings were prepared by adding modified nano-titanium hydride into epoxy coatings. The properties of the coatings were tested, and the effects of the amount of modified nano-titanium hydride on the properties of the coatings were studied. (1) the ball milling speed was optimized. Ball material ratio and ball milling time and other technological parameters. The optimum technological parameters are as follows: milling speed 650 r / min, ball material ratio 20:1 and milling time 10 h. (2) the structure and properties of ultrasonic ball milling products show that the average diameter of the modified titanium hydride nanoparticles is about 80 nm, and the particles are dispersed uniformly; The ultrasonic ball milling method can realize the grafting of epoxy resin on the surface of nano-particles, and the position of the surface grafting is near the epoxy group. The surface grafting rate of epoxy resin is about 6.54, and the surface grafting modification improves the dispersion stability of nano-particles in epoxy resin solution. Through the contrast tests of ultrasonic irradiation without ball milling, agitation ball milling without ultrasonic wave and ultrasonic assisted ball milling, it can be seen that only ultrasonic assisted ball milling technology, That is, the coupling of ultrasonic and mechanical force can realize the grafting modification of epoxy resin on the surface of nano-particles. (3) the surface modification improves the dispersion stability of nano-particles in the coating and the interfacial compatibility between nano-particles and epoxy matrix. Thus, the diffusion channels of interface defects and corrosive media are reduced, and the density and corrosion resistance of the coatings are improved significantly. (4) by comparing the mechanical properties and corrosion resistance of the coatings with different amounts of addition, When the content of modified titanium hydride is less than 5wt%, the properties of the coating increase with the increase of the amount of the coating, and when the addition amount is higher than 5wt%, the increase of the amount of the coating will lead to partial agglomeration of the nanoparticles, and the performance of the coating will become worse. The experimental results show that TiH _ 2 / epoxy nano-composite coatings have the best comprehensive properties. (5) the properties of the coatings can be improved by adding the modified nano-titanium hydride particles. Firstly, the surface modification improves the interfacial compatibility and interfacial adhesion between nano-particles and epoxy matrix, and increases the density and corrosion resistance of the coatings. Secondly, the uniformly dispersed nanoparticles can fill the structural micropores produced during the curing of the coating, so as to isolate the protected metal substrate from the channels connected to the outside world. In addition, the nanoparticles increase the tortuous degree of the diffusion channels of corrosive media and delay the corrosion process.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG174.4

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