纳米二氧化硅-有机硅复合涂层防护性能的研究

利用电化学阻抗谱（EIS）技术对纳米二氧化硅含量为5％的有机硅复合涂层的防护性能进行了研究，试验结果与有机硅清漆涂层和微米二氧化硅含量为5％的有机硅复合涂层的实验结果进行了比较。结果表明，纳米氧化硅粒子的填加有效地阻挡侵蚀介质的渗透和腐蚀，纳米氧化硅．有机硅复合涂层比有机硅清漆涂层和微米二氧化硅一有机硅复合涂层具有更好的防护性能。     

改性纳米氧化锌对丙烯酸聚氨酯涂层防腐性能的影响

为了改善纳米ZnO在涂料中的分散性,以钛酸酯偶联剂对其进行改性。研究了丙烯酸聚氨酯清漆、含未改性纳米氧化锌的丙烯酸聚氨酯涂层和添加钛酸酯偶联剂改性后的纳米氧化锌的丙烯酸聚氨酯涂层的防腐蚀性能。结果表明,经过钛酸酯偶联剂改性的纳米ZnO其团聚现象明显消失,与涂料表现出良好的相容性,所得的复合涂层的抗渗透能力明显比清漆和含未改性纳米ZnO复合涂层强。改性纳米ZnO显著提高了丙烯酸聚氨酯涂料的防腐性能。     

纳米二氧化硅-有机硅复合涂层防护性能的研究

利用电化学阻抗谱(EIS)技术对纳米二氧化硅含量为5%的有机硅复合涂层的防护性能进行了研究,试验结果与有机硅清漆涂层和微米二氧化硅含量为5%的有机硅复合涂层的实验结果进行了比较。结果表明,纳米氧化硅粒子的填加有效的阻挡侵蚀介质的渗透和腐蚀,纳米氧化硅-有机硅复合涂层比有机硅清漆涂层和微米二氧化硅-有机硅复合涂层具有更好的防护性能。     

纳米SiO2复合漆的制备及其耐蚀性能

通过化学改性，硅烷偶联剂（A858）与纳米SiO2表面的羟基发生反应，得到亲油性纳米SiO2，提高了SiO2与涂料的相容性。原子力显微镜（AFM）测试结果表明，SiO2粒子的平均尺寸约为50nm，分散均匀。在机械搅拌和超声场共同作用下，将纳米SiO2加入到油漆中，制备了纳米SiO2复合漆。浸泡腐蚀实验、阳极极化及交流阻抗（EIS）测试结果表明，纳米SiO2改善了油漆在NaCl水溶液中耐蚀性，SiO2质量分数为0．91％时，复合涂料的耐蚀性最佳。     

2006年中国聚氨酯论文文摘（二十六）

纳米Al2O3填充端异氰酸酯基聚丁二烯橡胶-环氧树脂复合涂层的干滑动摩擦磨损性能研究;纳米CaCO3改性水性聚氨酯涂料的研究探讨;蒙脱土改性水性聚氨酯的研究;纳米SiO2的表面改性及其在聚氨酯弹性体中的应用;纳米SiO2对聚氨酯清漆性能的影响……     

纳米二氧化硅浓缩浆在涂料中的应用研究

探讨了Nanos4000-2纳米二氧化硅浓缩浆在涂料中的添加工艺,分析了Nanos4000-2纳米二氧化硅浓缩浆对环氧涂料、聚氨酯涂料性能的影响.研究表明:Nanos4000-2纳米二氧化硅浓缩浆通过前添加研磨工艺加入环氧涂料、聚氨酯涂料中能达到完全分散的状态;采用Nanos4000-2纳米二氧化硅浓缩浆改性后的环氧涂层防腐蚀性有明显提升;用其改性后的聚氨酯涂层的耐老化性、耐磨性、硬度及表面接触角均有所提高,涂层光泽变化不大.     

硅烷偶联剂对光固化PUA/SiO2杂化涂料的改性研究

研究溶胶-凝胶法制备聚氨酯丙烯酸酯（PUA）/纳米二氧化硅（SiO2）复合涂料中加入硅烷偶联剂进行原位改性的作用机理,以期得到性能优良的有机-无机杂化纳米复合涂料。考察了硅烷偶联剂用量的变化对聚氨酯丙烯酸酯涂料性能的影响。结果表明,用硅烷偶联剂对溶胶-凝胶法制备的纳米二氧化硅进行改性,能够实现纳米颗粒的均匀分散,并在其表面形成良好的界面结合层;且适量的硅烷偶联剂的加入使聚氨酯丙烯酸酯涂料显示出优良的机械性能,表现出纳米材料特有的既增强又增韧特性,尤其是耐磨性能可以提高7倍。     

纳米二氧化硅改性环氧涂料在建筑护栏中的防护应用

纳米二氧化硅改性环氧树脂涂料因在树脂分子链中引入了Si─O柔性链段和富有弹性的网状硅氧四面体结构,使得涂层的柔韧性和附着力得到显著改善,防腐蚀性能提高。以纳米二氧化硅改性环氧涂料为底漆、丙烯酸聚氨酯涂料为面漆,应用于海南某高级酒店护栏的防护中,详细介绍了涂层体系的施工工艺,包括底材前处理、喷涂纳米二氧化硅改性环氧底漆、刮涂腻子层、喷涂丙烯酸聚氨酯面漆以及修补,测试了复合涂层的性能。结果表明,该复合涂层附着力1级,冲击强度≥50 kg·cm,柔韧性≤1 mm,硬度≥2H,耐盐雾腐蚀时间≥3 000 h,耐人工加速老化时间≥1 000 h。该涂层配套体系在酒店护栏上使用一年后,涂层无失光、变色等现象,显示出优异的防护性能和装饰性能。     

纳米二氧化硅在丙烯酸聚氨酯改性涂料中应用研究

将改性后的纳米二氧化硅用于丙烯酸聚氨酯防腐涂料中,研究了纳米二氧化硅的含量、分散剂的含量等因素对涂料性能的影响;当硅烷偶联剂KH-550的添加量为纳米二氧化硅用量的3%~5%时分散性最好;经改性丙烯酸聚氨酯面漆机械性能和耐化学性能均达到国家标准。     

纳米材料在改性水性聚氨醋中的应用(I)

本文介绍了纳米材料改性水性聚氨酯的制备方法,综述了纳米二氧化硅、纳米二氧化钛、纳米蒙脱土和纳米聚多糖对水性聚氨酯改性的研究进展,并对该类涂料的发展趋势和应用前景进行了展望.     

Surface and mechanical properties of an organic-inorganic super- hydrophobic coating using modified nano-SiO2 and mixing polyurethane emulsion as raw materials

A series of organic-inorganic super-hydrophobic coatings were prepared using nano-SiO₂ particles modified by fluorine and silicone coupling agents, and a mixing polyurethane emulsion as main raw materials. The mixing polyurethane emulsion was consisted of the polyurethane emulsion end-terminated by double bond (WPUD) and polyurethane emulsion modified by silicone (WPUS). The influence of content of modified nano-SiO₂ particles and the weight ratio of WPUS to WPUD on microstructure and hydrophobicity of the coating surface were studied. The morphologies of coating surface were examined using SEM and AFM, hydrophobicity of the coating was researched by examining static water contact angle and so on. It was found that modified nano-SiO₂ particle was an indispensable factor during the preparation of super-hydrophobic coating. The roughness and hydrophobicity of the coating surface were enhanced obviously with an increase of the content of the modified nano-SiO₂ particles. When the content of the modified nano-SiO₂ particles increased up to 1.5%, the surface of coating possessed good super-hydrophobicity, and static water contact angle reached 169.1°. It was also noticed that the weight ratio of WPUS to WPUD in the base layer has also an important influence on the hydrophobicity and mechanical property of coating surface. With an increase of the ratio of WPUS to WPUD the hydrophobicity of the coating was enhanced, the tensile strength and peel strength reduced, but the elongation at break increased. When the weight ratio of WPUS to WPUD reaches up to 9/100, the static water contact angle reaches the maximum value of 169.1°.     

改性纳米SiO2/聚氨酯-含氟丙烯酸酯无皂乳液合成及其胶膜性能表征

引言水性聚氨酯相对溶剂型聚氨酯具有不燃、气味小、不污染环境等优点[1-2],从而广泛用于涂料[3]、胶黏剂[4]、油墨[5]等领域。目前,常用于软包装领域的薄膜主要是表面能很低的非极性膜,而水性聚氨酯胶黏剂具有较高的表面自由能,对非极性膜的润湿性差,因此需要降低水性聚氨酯的表面张力,达到润湿非极性膜的目的。     

Novel bi-layered nanostructured SiO2/Ag-FHAp coating on biodegradable magnesium alloy for biomedical applications

In this study, a novel bi-layered nanostructured silica (SiO₂)/ silver-doped fluorohydroxyapatite (Ag-FHAp) coating was deposited on biodegradable Mg-1.2Ca-4.5Zn alloy via physical vapor deposition (PVD) combined with electrodeposition (ED). The nano-SiO₂ underlayer had a compact columnar microstructure with thickness of around 1 µm while the Ag-FHAp overlayer presented large plate-like crystals accompanied with small rounded particles with thickness about 10 µm. Potentiodynamic polarization test exhibited that the double layer SiO₂/Ag-FHAp coated Mg alloy has superior corrosion resistance compared to uncoated and single layer SiO₂ coated samples. Contact angle measurement showed that Ag-FHAp coating over nano-SiO₂ layers significantly increased surface wettability which is favorable for the attachment of cells. Cytotoxicity tests indicated that the nanostructured SiO₂/Ag-FHAp coating enabled higher cell viability compared to nano-SiO₂ coating and uncoated samples. In addition, bi-layer and single-layer coatings considerably improved the ability of cell attachment than that of the uncoated samples. The cell viability of coated and uncoated samples increased with increasing incubation time. The double layer SiO₂/Ag-FHAp coated biodegradable Mg alloy possessed high corrosion resistance and cytocompatibility and can be considered as a promising material for implant applications.     

Application of EIS and salt spray tests for investigation of the anticorrosion properties of polyurethane-based nanocomposites containing Cr2O3 nanoparticles modified with 3-amino propyl trimethoxy silane

The Cr₂O₃ nanoparticles were modified with 3-amino propyl trimethoxy silane in order to obtain proper dispersion and increment compatibility with the polyurethane coating matrix. The nanocomposites prepared were applied on the St-37 steel substrates. The existence of 3-amino propyl trimethoxy silane on the surface of the nanoparticles was investigated by Fourier transform infrared (FTIR) spectroscopy and thermal gravimetric analysis (TGA). Dispersion of the surface modified particles in the polyurethane coating matrix was studied by a field emission-scanning electron microscope (FE-SEM). The electrochemical impedance spectroscopy (EIS) and salt spray tests were employed in order to evaluate the corrosion resistance of the polyurethane coatings. Polarization test was done in order to investigate the corrosion inhibition properties of the Cr₂O₃ nanoparticle on the steel surface in 3.5 wt.% NaCl solution. The adhesion strengths of the coatings were evaluated by pull-off adhesion tester before and after 120 days immersion in 3.5 wt.% NaCl solution. FT-IR and TGA analyses revealed that surface modification of the nanoparticles with 0.43 silane/5 g pigment resulted in the greatest amount of silane grafting on the surface of particles. Results obtained from FE-SEM analysis showed that the surface modified nanoparticles dispersed in the coating matrix properly. Results obtained from EIS and salt spray analyses revealed that the surface modified particles enhanced the corrosion protection performance of the polyurethane coating considerably. The improvement was more pronounced for the coating reinforced with 0.43 g silane/5 g pigment. Moreover, the adhesion loss decreased in the presence of surface modified nanoparticles with 0.43 silane/5 g pigment.     

火焰喷涂聚酰胺12/n-SiO2复合涂层工艺及性能

采用火焰喷涂法制备了聚酰胺12 (PA12)及聚酰胺12/纳米SiO₂ (n-SiO₂)复合涂层,并利用电子拉力机、摩擦磨损试验机、红外光谱仪（FTIR）和示差扫描量热仪（DSC）等对涂层的结构与性能进行了研究。红外光谱分析表明PA12及PA12/ n-SiO₂粉末在火焰喷涂过程中没有发生氧化或降解反应,表明火焰喷涂法适宜制备PA12及PA12/n-SiO2复合涂层;DSC分析结果表明n-SiO₂具有成核剂作用,能提高PA12大分子的结晶速度及结晶度;涂层力学性能及摩擦磨损性能分析表明n-SiO₂能提高涂层的力学性能,改善涂层的耐老化性能和摩擦磨损性能。当n-SiO₂添加量为1.5%（质量）时,涂层综合性能最佳。     

Preparation and characterization of soy protein isolate/SiO2 nanocomposite films and their walnut oil microcapsules

In this study, nano-SiO₂/soy protein isolate composite film was prepared by casting method. The effects of (adding 0%, 1%, 3%, 5%, 7%, and 9% w/w) nano-SiO₂ on the properties of the resulting blend films were investigated. Results showed that the addition of 5% nano-SiO₂ exhibited good barrier properties. The mechanical properties including tensile strength and elongation at break of the film with 7% nano-SiO₂ is increased by 82.6% and 31.49% correspondingly. Differential scanning calorimetry indicated that the melting temperature of the composite film is increased by 56.6°C compared with the pure film. The wall material modified by nano-SiO₂ (adding 1%, 3%, 5%, 7%, and 9% w/w) was used for encapsulating walnut oil by spray drying. After accelerating oxidation test at 63°C for 12 days, we found that the encapsulation efficiency value of walnut oil microcapsules with 0%, 1%, 3%, 5%, 7%, and 9% nano-SiO₂ decreased by 64.23%, 48%, 21%, 22%, 21.00%, and 31% respectively. The results suggested that the stability of the core material was improved by adding nano-SiO₂ to the wall material.     

Studying the effect of organo-modified nanoclay loading on the thermal stability,flame retardant,anti-corrosive and mechanical properties of polyurethane nanocomposite for surface coating

Clay polyurethane nanocomposite (CPN) coating films were fabricated by uniformly dispersing nanoclay, organically modified with 25–30 wt.% octadecylamine in varying concentrations up to 5 wt.%, in a commercial two component, glossy, acrylic aliphatic polyurethane using ultrasonication. Organo-modified nanoclay was characterized by X-ray diffraction (XRD). The dispersion of the nanoclay into the matrix was investigated by scanning electron microscopy (SEM). CPN coating films were characterized by thermogravimetric analysis (TGA), and flame retardant, corrosion resistance and mechanical properties were also investigated. The XRD measurement indicated that, the organo-modified nanoclay particles were mainly constituted of montmorillonite with traces of quartz and calcite also found to be present. The SEM analysis showed that the nanoclay layers were dispersed and intercalated into the polyurethane coating. Thermogravimetric analysis showed that incorporating 5 wt.% organo-nanoclay into polyurethane considerably enhanced the thermal stability and increased the char residue to 14.11 wt.% relative to 4.58 for the sample without organo-nanoclay (blank polyurethane). The limiting oxygen index (LOI) test revealed that incorporation of organo-nanoclay led to a further increase in LOI values, which indicate an improvement in flame retardancy properties. The corrosion resistance also improved and this improvement increases with increase nanoclay wt.%. The mechanical resistance measurements demonstrated that the gloss of the CPN coating films slightly decreased, although hardness, adhesion and impact resistance of the CPN coating films improved with the incorporation of the organo-nanoclay.     

SiO2-g-PS纳米微球的制备及其在增韧PP中的应用

采用乳液聚合方法在纳米SiO₂粒子表面接枝苯乙烯（St）单体,制备了具有核/壳结构的SiO₂-g-PS纳米微球,用FTIR、TEM、XPS和TG分析了SiO₂-g-PS的结构。结果表明,乳液聚合产物基本呈球形、SiO₂为核、PS为壳的核壳结构。通过熔融共混工艺制备聚丙烯（PP）基复合材料,并对其力学性能进行了分析,结果表明,当SiO₂-g-PS填充量较低［4%～6％（质量）］时,SiO₂-g-PS/PP复合材料的冲击强度和拉伸强度明显提高,并对PP的结晶有明显的异相成核作用。     

PP/PP-g-NH2/纳米SiO2复合材料的非等温结晶

采用示差扫描量热法（DSC）研究了聚丙烯/氨基化聚丙烯/纳米二氧化硅（PP/PP-g-NH₂/SiO₂）复合材料的非等温结晶行为。利用Caze法对结晶动力学进行了分析,Avrami指数n表明纳米SiO₂和PP-g-NH₂的加入改变了PP的结晶成核和生长机理;运用Dobreva法研究了纳米粒子的成核活性,结果表明纳米SiO₂成核活性差,增容剂PP-g-NH₂明显增强其成核活性;采用Friedman法分析了复合材料的结晶有效能垒,研究表明加入纳米SiO₂使PP的结晶有效能垒降低,添加PP-g-NH₂则进一步降低复合体系的结晶有效能垒;当纳米粒子含量为3%时,添加5% PP-g-NH₂能有效提高纳米粒子成核活性,降低复合材料结晶有效能垒。