水性纳米TiO_2/PTFE氟碳防污闪材料的制备及性能

为防止高压输电线路绝缘子污闪事故的发生,本文以纳米TiO_2和聚四氟乙烯(PTFE)微粉的复合填料与水性氟碳树脂制备了一种的表面具有自清洁效应的纳米TiO_2/PTFE复合氟碳防污闪涂层材料。通过优化配方及一系列制备工艺试验,确定了纳米TiO_2和PTFE的添加量及配比。采用扫描电镜(SEM)、X射线光电子能谱仪(XPS)及接触角测量仪对涂层表面的微观结构及疏水性进行了分析表征。结果表明,当纳米TiO_2质量百分比添加量为6%,PTFE质量百分比添加量为16%时,TiO_2/PTFE复合氟碳防污闪涂层材料对水静态接触角达到124°,涂层表面具有微/纳二元粗糙结构,有优良的表面疏水性。通过对涂层的理化电气性能测试表明,涂层具有优异的理化电气性能,其附着力、硬度、耐水性、耐酸碱性、体积电阻率等各项指标均达到国家标准。     

纳米SiO2添加量对紫外光固化涂料涂层性能的影响

将纳米SiO2加入紫外光固化涂料,可以改善其涂层性能。制备了UV固化环氧丙烯酸酯/纳米SiO2复合涂料涂层,对其硬度、附着力、耐腐蚀性能及热稳定性等性能进行了研究,找出了纳米SiO2对涂层性能的影响规律。结果表明:涂层的硬度及附着力先随纳米SiO2添加量的增加而提高,添加量为3.0%时,涂层附着力达1级;添加量为4.0%时,涂层铅笔硬度达5H;添加量继续增大,涂层的硬度及附着力均下降;纳米SiO2的加入能够提高涂层的热稳定性和耐腐蚀性能,但添加量过多涂层耐腐蚀性能反而下降。     

新型水性环氧富锌涂料的制备及性能研究

为了满足重防腐蚀领域对涂料耐久性的需要,通过调节环氧富锌涂料中锌粉的比例、添加硅烷偶联剂、优化涂料防沉体系,制备了耐腐蚀性能强、储存稳定性高的水性环氧富锌底漆.研究了该涂料中锌粉、偶联剂、防沉剂3种组分对涂层耐腐蚀性能、附着力及储存稳定性的影响,并将该涂层与环氧中间漆、水性聚氨酯防腐蚀面漆组成了复合涂层体系,分析测试了复合涂层体系的耐中性盐雾腐蚀性能及附着力.结果表明:制备水性环氧富锌底漆的过程中,控制有机膨润土和亲油性气相二氧化硅的含量可提高涂料的储存稳定性,其中锌粉加入量为55.0％(质量分数,下同),防沉剂有机膨润土和气相二氧化硅含量分别为0.8％和1.0％时,涂料的储存稳定性可达10级;硅烷偶联剂加入量为1.5％时,涂层与基体间的结合强度可达到11.3 MPa;该涂料作为底漆与环氧中间漆、水性聚氨酯面漆组成的复合涂层体系,在经过3 600 h中性盐雾试验后不剥落,可用于重防腐蚀领域.     

镁合金表面微弧氧化陶瓷涂层的制备及耐蚀性能

利用微弧氧化法,在微弧氧化反应电解质中加入氟钛酸钾和GR/TiO_2粉末,在镁合金表面制备了MAO-GR/TiO_2涂层。采用SEM和FT-IR分别对GR/TiO_2粉末的表面形貌和结构进行了研究,用SEM、XRD和元素线扫描对MAO-GR/TiO_2涂层的表面形貌、相结构和元素分布进行了研究,用三电极技术对MAO-GR/TiO_2涂层的耐腐蚀性能进行了研究。结果表明,通过溶胶-凝胶法可将纳米TiO_2接枝到GO表面,生成GR/TiO_2粉末;MAO-GR/TiO_2涂层主要由Mg_2TiO_4相、Mg_3(PO4)_2相、Mg和MgO相组成;以界面为分界线,涂层一侧Ti、P和O元素高于基体一侧,基体一侧Mg元素高于涂层一侧;MAO-GR/TiO_2涂层的腐蚀电位为-0.723 V,腐蚀电流密度为8.96×10~(-8) A/cm~2,相比镁合金基体和MAO涂层,腐蚀电位提高了48.3%和36.7%,表明MAO-GR/TiO_2涂层可以显著提高镁合金基体的耐蚀性能。     

热化学反应法制备陶瓷涂层及其耐蚀性能

为了提高Q235钢的耐腐蚀性能,采用热化学反应法在其表面制备了陶瓷涂层,并对涂层的组织结构和耐腐蚀性能进行了研究.结果表明:微米、纳米SiO_2基陶瓷涂层经600℃固化后,均生成了新物相,具有良好的致密性和结合强度;微米涂层的耐酸、耐碱、耐盐性能分别是基体的4.00,1.07,4.02倍,纳米陶瓷涂层的耐酸、耐碱、耐盐性能分别是基体的17.00,1.79,13.80倍.     

红外低发射率铝/水性丙烯酸涂层的光学及耐腐蚀性能研究

为改善铝/水性丙烯酸涂层的性能,通过正交试验研究了铝/水性丙烯酸涂料的优化制备,并考察了涂层光泽度、发射率、色度、硬度、附着力、抗冲击性、耐腐蚀性等性能。结果表明:干燥时间对涂层红外发射率的影响比Al粉含量和纳米氧化硅原浆含量更加显著。当干燥时间从0.5 min延长到6.0 min时,涂层的光泽度从8.1%缓慢下降到6.9%;红外发射率从0.242下降到0.113后又上升至0.268; L’值逐渐降低且变化幅度较小。当干燥时间为0.5～2.0 min时,涂层的硬度最大;当干燥时间为0.5～6.0 min时,涂层附着力等级为0级,较好;当干燥时间为1.0～3.0 min时,涂层抗冲击性最好;当干燥时间为1.0 min时,涂层的耐腐蚀性能较好。综合考虑,当干燥时间为1.0,2.0 min时,水性涂层性能较好。     

疏水性水性环氧涂料的性能及表征

在水性环氧固化剂中加入自制含氟助剂及其他填料,与水性环氧乳液配制成双组分疏水性水性环氧涂料。讨论了自制含氟助剂的用量对疏水性水性环氧涂料涂层接触角等性能的影响。采用红外光谱法、热分析法和动态力学分析方法对水性环氧涂料涂层固化过程中结构变化特征、涂层热稳定性和涂层耐化学试剂性等性能做了表征。结果表明:自制含氟助剂用量为2%,疏水性水性环氧涂料接触角显著提高,涂料固化反应完全,热稳定性和耐化学试剂性良好。     

纳米SiO_2溶胶掺量对环氧有机硅涂料防腐蚀性能的影响

为得到综合性能更优的应用于钢桥结构的复合防腐蚀体系,将甲基丙烯酰氧基丙基(甲基)二甲氧基硅烷和甲基三乙氧基硅烷按一定配比制备有机硅预聚物,用环氧树脂E20对其改性,再用不同掺量的纳米SiO_2溶胶进行掺杂改性,得到纳米SiO_2溶胶改性环氧有机硅复合涂料,将加入氨基硅烷固化后的复合涂料涂覆于标准试板,经干燥固化得到复合涂层。采用傅立叶变换红外光谱、激光粒径分析、扫描电镜、接触角测量、附着力测试等表征了复合涂层的结构及性能。结果表明:当硅溶胶掺量为3%时,复合涂层的力学性能、耐腐蚀性能都得到较大改善,硅溶胶对涂层的耐老化性能影响不大。     

Cr/CrN/Cu-TiN膜的成分与性能研究

为了使手术器械具有疏水抗菌性,我们在手术器械表面制备了具有微纳米结构的Cr/Cr N/Cu-Ti N膜。基体表面微纳米化用化学刻蚀法,膜层制备用高功率脉冲磁控溅射法,试样检测用SEM、EDS、接触角测量仪和涂层附着力自动划痕仪等。试样薄膜抗菌元素Cu含量随偏压增大从3.09%降到1.77%;膜基结合力随偏压增大呈先增后减趋势,-50 V时膜基结合力最大,为34 N;比较基体未经刻蚀处理和经过微纳米化刻蚀处理的试样的疏水性,差异明显,前者的水接触角为78°,后者的水接触角为132°。     

TiO2纳米复合氟碳涂料的性能

为了提高氟碳涂料的性能,采用硅烷偶联剂KH-550对纳米TiO2进行表面改性,再添加于氟碳涂料制成TiO2纳米复合氟碳涂料,在马口铁上涂膜.采用红外光谱、透射电镜(TEM)及沉降试验对纳米TiO2的改性效果进行评价,通过自清洁测试、接触角测量仪、色差仪和电化学测量系统分别对未添加TiO2的氟碳涂料涂膜和TiO2纳米复合氟碳涂料涂膜的自清洁性能、疏水性能、抗紫外性能及耐腐蚀性能进行了表征.结果表明:改性后的纳米TiO2分散性好,制得的TiO2纳米复合涂料涂膜具有较好的自清洁、疏水、抗紫外老化、耐腐蚀等性能,比未添加TiO2的氟碳涂料涂膜的有较大改善;且添加纳米TiO2并未影响涂膜的硬度、附着力、耐冲击、耐水、耐酸碱等性能.     

纳米TiO_2添加剂对ZL101A铝合金微弧氧化膜耐蚀性能的影响

目前,关于纳米TiO_2含量对铝合金微弧氧化膜耐蚀性的影响报道较少。在硅酸盐电解液中加入不同浓度纳米TiO_2,在ZL101A铝合金表面制备微弧氧化膜。采用扫描电镜(SEM)、X射线衍射仪(XRD)、电化学极化曲线及交流阻抗等,研究了纳米TiO_2浓度对微弧氧化膜耐蚀性能的影响。结果表明:纳米TiO_2进入到微弧氧化膜中,膜层表面变得更加致密;随着纳米TiO_2浓度的增加,膜层在3.5%Na Cl溶液中的腐蚀电流密度不断减小,交流阻抗不断增大,膜层的耐蚀性明显提高;综合考虑形貌和耐蚀性,本工作中纳米TiO_2最佳浓度为20 g/L。     

纳米TiO2浆料改性氯醚树脂防蚀涂层的初步研究

氯醚树脂生产环保、防蚀性能好,但其耐候性不佳,有待改进.纳米TiO2抗紫外性能优异,但有关其改性防蚀涂料及性能的研究鲜见报道.为此,采用金红石型纳米TiO2对氯醚树脂防蚀涂料进行了改性处理,并用国家标准和人工加速老化试验考察了纳米TiO2的加入对氯醚树脂涂层的附着力、柔韧性、耐冲击、紫外老化等性能的影响,用电化学阻抗法考察了添加纳米TiO2对漆膜防蚀性能的影响.结果表明,添加纳米TiO2对氯醚树脂漆膜的附着力、柔韧性和耐冲击没有明显改善,但能提高漆膜耐紫外老化的性能,漆膜的光泽度也有所提高,纳米TiO2加入适量时还能提高漆膜的防蚀性能.因此,纳米材料在氯醚树脂防蚀涂料中的应用是可行的.     

Effect of surface fluorination of TiO2 particles on photocatalitytic activity of a hybrid multilayer coating obtained by sol-gel method

A multilayer photoactive coating containing surface fluorinated TiO(2) nanoparticles and hybrid matrices by sol gel approach based on renewable chitosan was applied on poly(lactic acid) (PLA) film by a step wise spin-coating method. The upper photoactive layer contains nano-sized functionalized TiO(2) particles dispersed in a siloxane based matrix. For the purpose of improving TiO(2) dispersion at the air interface coating surface, TiO(2) nanoparticles were modified by silane coupling agent 1H,1H,2H,2H-perfluorooctyltriethoxysilane (FTS) with fluoro-organic side chains. An additional hybrid material consisting of chitosan (CS) cross-linked with 3-glycidyloxypropyl trimethoxy silane (GOTMS) was applied as interlayer between the PLA substrate and the upper photoactive coating to increase the adhesion and reciprocal affinity. The multilayer TiO(2)/CS-GOTMS coatings on PLA films showed a thickness of ~4-6 μm and resulted highly transparent. Their structure was exhaustively characterized by SEM, optical microscope, UV-vis spectroscopy and contact angle measurements. The photocatalytic activity of the multilayer coatings were investigated using methyl orange (MeO) as a target pollutant; the results showed that PLA films coated with surface fluorinated particles exhibit higher activity than films with neat particles, because of a better dispersion of TiO(2) particles. The mechanical properties of PLA and films coated with fluorinated particles, irradiated by UV light were also investigated; the results showed that the degradation of PLA substrate was markedly suppressed because of the UV adsorptive action of the multilayer coating.     

Effects of Nano Pigments on the Corrosion Resistance of Alkyd Coating

Alkyd coatings embedded with nano-TiO2 and nano-ZnO pigments were prepared. The effects of nano pigments on anticorrosion performance of alkyd coatings were investigated using electrochemical impedance spectrum （EIS）. For the sake of comparison, the corrosion protection of alkyd coatings with conventional TiO2 and ZnO was also studied. It was found that nano-TiO2 pigment improved the corrosion resistance as well as the hardness of alkyd coatings. The optimal amount of nano-TiO2 in a colored coating for corrosion resistance was 1%. The viscosities of alkyd coatings with nanometer TiO2 and ZnO and conventional TiO2 and ZnO pigments were measured and the relation between viscosity and anticorrosion performance was discussed.     

Photocatalytic performance of Sn-doped and undoped TiO2 nanostructured thin films under UV and vis-lights

Sn-doped and undoped nano-TiO(2) particles have been synthesized by hydrotermal process without solvent at 200 degrees C in 1h. Nanostructure-TiO(2) based thin films have been prepared on glass substrate by spin-coating technique. The structure, surface morphology and optical properties of the thin films and the particles have been investigated by element analysis and XRD, SEM, BET and UV-vis-NIR techniques. The photocatalytic performance of the films were tested for degradation of Malachite Green dye in solution under UV and vis-lights. The results showed that (a) hydrothermally synthesized nano-TiO(2) particles are fully anatase crystalline form and are easily dispersed in water, (b) the coated surfaces have nearly super-hydrophilic properties and, (c) the doping of transition metal ion efficiently improved the photocatalytic performance of the TiO(2) thin film.     

Self-assembled monolayer of 3-aminopropyltrimethoxysilane for improved adhesion between aluminum alloy substrate and polyurethane coating

A good adhesion between a polymer coating and a metal or metal alloy substrate such as Al 2024-T3 plays a critical role in corrosion protection of metal substrates. In our study, a self-assembled monolayer film of 3-aminopropyltrimethoxysilane was formed on Al 2024-T3 substrate by covalent bonding. The adhesion property of a self-priming polyurethane coating was evaluated by pull-off adhesion test, wet tape test and thermal cycling test. All the testing results indicate that both dry and wet adhesion properties of the polyurethane coating were improved significantly after APS treatment of Al 2024-T3 in polar solvents such as methanol and acetone. In nonpolar solvents such as hexane, the APS treatment led to inconsistent improvement or sometime decreased adhesion of polyurethane coating. X-ray photoelectron spectroscopic study revealed that while a monolayer film was formed on the aluminum alloy surface after treating the substrate with APS in methanol and acetone, a multilayer film was formed on the substrate surface when the treatment was conducted in hexane. The APS monolayer film served as a covalent bond linkage between polymer coating and aluminum alloy substrates, which led to the increased adhesion property of polymer coating and corrosion resistance of the metal alloy substrate.     

Preparation of re-usable photocatalytic filter for degradation of Malachite Green dye under UV and vis-irradiation

Sn(4+) doped and undoped nano-TiO(2) particles easily dispersed in water were synthesized without using organic solvent by hydrothermal process. Nanostructure-TiO(2) based thin films were prepared on flyswatter substrate, made with stainless steel, by dip-coating technique. The structure, surface and optical properties of the particles and thin films were characterized by element analysis and XRD, BET, SEM and UV/vis/NIR techniques. The photocatalytic performance of the films were tested for degradation of Malachite Green dye in solution under UV and vis-lights. The results showed that the coated flyswatter has a very high photocatalytic performance for the photodegradation of Malachite Green irradiated with UV and vis-lights. The results also proved that the hydrothermally synthesized nano-TiO(2) particles are fully anatase crystalline form and are easily dispersed in water, the coated surfaces are hydrophilic, and the doping of transition metal ion efficiently improved the degradation performance of TiO(2)-coated flyswatter. The photocatalytic performances determined at both irradiation conditions were very good and were almost similar to each other for Sn(4+) doped TiO(2)-coated flyswatter and it can be repeatedly used with increasing photocatalytic activity compared to undoped TiO(2)-coated flyswatter.     

表面改性纳米TiO2粒子杂化PI薄膜的制备与性能研究

采用硅烷偶联剂(γ-巯丙基三乙氧基硅烷)对纳米TiO2粒子进行表面处理,通过原位聚合和流延成膜法制备了不同TiO2含量的PI/TiO2杂化膜,研究了杂化膜的热性能、力学性能,并通过扫描电镜(SEM)和广角X衍射(WAXD)研究了杂化膜的微观形貌结构,同时也对杂化膜的接触角和介电常数(ε)进行了研究分析.结果表明,杂化膜较纯膜的热分解温度(T5％)降低,但平均热分解温度仍然高于520℃,且膜的尺寸稳定性得到了提高,即热膨胀系数( CTE)降低;表面形貌分析表明,1％～5％的表面改性纳米TiO2能较好地分散在PI膜里,杂化膜的介电常数(3.50左右)均高于纯膜的的介电常数(2.91),杂化膜的接触角随着TiO2含量的增加呈现先减少后增加的趋势.     

溶胶-凝胶法制备TiO2与SiO2-TiO2薄膜对医用NiTi合金的表面改性

采用溶胶－凝胶法制备TiO2与SiO2-TiO2薄膜，对医用NiTi合金进行表面改性处理，利用X射线衍射（XRD）、原子力显微镜（AFM）、划痕试验和电化学腐蚀试验等手段系统研究了薄膜结构、形态及性能。通过动态凝血时间和血小板粘附的测量研究和评价了薄膜的体外血液相容性。结果表明，在一定范围内，较高热处理温度有利于薄膜与基体间的结合强度和耐腐蚀性的提高；NiTi合金表面镀TiO2与SiO2-TiO2薄膜后，其血液相容性明显提高。     

7075铝合金无铬磷化成膜动力学过程及其性能

直接在7075铝合金表面喷涂油漆,其结合力和防护性能较差。先对7075铝合金作磷化处理再喷涂环氧底漆和聚氨酯面漆。应用X射线衍射仪、Autolab电化学工作站和扫描电子显微镜及加温耐盐水试验对磷化膜的物相组成、成分、表面形貌及其耐蚀性进行了研究;探讨了磷化处理对7075铝合金表面漆膜层结合力及耐腐蚀性能的影响。结果表明:7075铝合金表面磷化动力学过程分为基体阳极溶解、表面形核及膜层增厚3个阶段,主要得到了由Mn Zn2(PO4)2,Zn3(PO4)2,Al PO4等物相组成的多孔磷化膜; 7075铝合金表面的自腐蚀电流由磷化前的40.17μA/cm^2降低到磷化后的7.37μA/cm^2,磷化提高了其耐点蚀性能;磷化处理还极大地提高了漆膜与7075铝合金的附着力和耐腐蚀性。