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。     

聚吡咯/纳米ZnO复合材料制备及其防腐性能研究

在纳米ZnO粒子存在的情况下,以吡咯单体为原料,对甲苯磺酸为掺杂剂,三氯化铁为氧化剂,采用化学氧化法制备了聚吡咯(PPy)/纳米ZnO复合物。采用扫描电子显微镜、紫外可见分光光度计和傅立叶变换红外光谱仪对复合物进行形貌观察和结构表征。分别以PPy和PPy/纳米ZnO复合物为填料,加入到聚氨酯(PUR)涂层中,再涂覆于碳钢片表面,之后浸泡在3.5%Na Cl溶液中,通过开路电位、极化曲线和交流阻抗研究涂层的防腐性能。结果表明,含有PPy/纳米ZnO复合物的PUR涂层耐腐蚀效果优于PUR/PPy涂层。     

防腐蚀涂料

<正>201701013水性聚氨酯纳米复合涂层及其防腐蚀性能研究[刊,英]/Christopher,G.等//Progress in Organic Coatings.-(2016),99.-91~102采用溶液混合技术制备了低VOC含量、低成本且工艺简单的纳米复合涂层。成功制备了含有经生物聚合物(如海藻酸钠和木质素磺酸盐)改性的Zn O纳米粒子的水性聚氨酯分散体,并将制得的纳米复合材料涂覆于低碳钢上。通过超声波处理法制备了含有改性ZnO     

透明氧化锌/有机硅纳米复合涂层的研制及性能

采用化学改性方法将自制的纳米ZnO颗粒接枝到含氢聚硅氧烷(PMHS)分子链上,以该接枝聚合物(ZnO–PMHS)和端乙烯基聚硅氧烷为反应物,在铂催化作用下合成了一种可用于电子封装的透明有机硅纳米ZnO复合涂层。研究了纳米ZnO含量对涂层力学性能和光学性能的影响,通过扫描电镜、傅里叶变换红外光谱和热重分析,对纳米ZnO改性前后的涂层进行了表征。研究表明,ZnO纳米颗粒通过化学接枝连接到聚合物分子链上;ZnO纳米颗粒的接枝反应改变了复合涂层的折光指数,当纳米ZnO含量为0.06%时,复合涂层在640 nm处的透光率达到80%以上,对300 nm以下的紫外光的屏蔽效率达到90%以上;与未含纳米ZnO的涂层相比,有机硅纳米ZnO复合涂层的耐紫外老化能力提高了5倍,初始热分解温度提高25%,热分解残留质量提高15%,表现出优异的耐热和耐紫外老化性能,满足电子产品的封装要求。     

高紫外反射型颜料与热控涂层的制备与性能研究

针对传统热控涂层在紫外波段的高吸收现象,以铈酸钇、纳米氧化锌和介孔材料 SBA-15为原料,通过高温烧结的方式制备出高紫外反射型热控颜料,将其分别与无机粘结剂硅酸钾或有机粘结剂环氧改性有机硅树脂相结合制备成低吸辐比（ α_s/ε）热控涂层。结果表明： ZnO/SBA-15与硅酸钾制得的热控涂层紫外波段反射率超过 0.90,吸辐比小于 0.08。对颜料及热控涂层的微观形貌、光学性能和耐候性能研究表明,该类热控涂层具有优异的光学性能和较强的环境适应能力。     

抗紫外纳米ZnO粉体的制备与表面改性

叙述了无机纳米ZnO的制备与表面改性及其抗紫外的优良性能,并用多种表征手段对所制备并经改性的粉体性质进行了性能测试,所制得的纳米ZnO粒度均匀,分散性好,紫外吸收能力可与进口的粉体相媲美,适用于化妆品、涂料、塑料橡胶等作抗紫外剂。     

改性纳米氧化锌对丙烯酸聚氨酯防腐性能的影响

采用钛酸酯偶联剂改性纳米ZnO,改善其在涂料中的分散性,通过红外、SEM分析证明改性效果理想。然后将改性后的纳米ZnO以不同的添加量(分别为0.05%、0.5%、1%、2%质量比)加入丙烯酸聚氨酯涂料中,将此4种涂层分别进行EIS测试与分析,并结合其耐盐水表面形貌分析得出0.5%含量的改性纳米复合涂层具有最好的防腐效果,其涂层防腐性明显优于其他3种涂层。     

环氧／纳米ZnO复合涂层对镁锂合金耐腐蚀性的影响

以聚丙烯酰胺凝胶法制备了纳米ZnO,并对其进行改性,得到了环氧/纳米ZnO复合涂层.采用XRD和SEM对环氧/纳米ZnO复合涂层进行了表征.通过极化曲线和交流阻抗研究了裸基、复合涂层以及经锡酸盐转化处理后涂覆环氧/纳米ZnO的复合涂层的耐蚀性能.结果表明:复合涂层呈明显的两相结构,纳米ZnO分布均匀;复合涂层和锡酸盐转化协同,提高了镁锂合金的耐腐蚀性能.涂层中纳米ZnO质量分数不同,对镁锂合金耐蚀性能有不同的影响,纳米ZnO质量分数为2%时,复合涂层对镁锂合金的保护作用最强.     

纳米复合涂料

纳米复合氟涂料及其加工方法;纳米ZnO/聚氨酯复合涂层的制备及其性能研究;无机纳米杂化聚酰亚胺薄膜的制备及性能研究.     

纳米ZnO粉体的制备及紫外-可见光吸收性能研究

采用直接沉淀法,以ZnSO4·7H2O为锌源,以Na2CO3为沉淀剂制得纳米ZnO的前驱体,在不同的热处理温度条件下制备了不同晶粒尺寸的纳米ZnO粉体.用X-射线衍射仪,透射电子显微镜和紫外-可见分光光度计对粉体的晶体结构,显微形貌和紫外-可见光吸收性能进行了表征,并重点探讨了煅烧温度对纳米ZnO粉体在紫外-可见光波段吸收性能的影响.结果表明,前驱体为Zn5(OH)6(CO3)2,300℃以上的煅烧温度下为六方晶系的球形纳米ZnO.合成的粉体在可见光区有很好的透过性,而在紫外光区具有很宽的吸收频段和优异的吸收性能,且随煅烧温度的不同而出现变化.     

Ageing behavior of acrylic polyurethane varnish coating in artificial weathering environments

Polyurethane-based coatings reinforced by ZnO nanoparticles (about 27 nm) were prepared via solution blending. The ZnO/PU films and coats were fabricated by a simple method of solution casting and evaporation. The mechanical properties of the films were investigated by a universal material test, and the abrasion resistance of the prepared coats was evaluated by a pencil-abrasion-resistance tester. It was found that significant improvement of the PU films in Young’s modulus and tensile strength was achieved by incorporating ZnO nanoparticles up to 2.0 wt%, and that the abrasion resistance of the PU coats was greatly enhanced due to the addition of ZnO nanoparticles. Moreover, the antibacterial property test was carried out via the agar dilution method and the result indicated that PU films doped with ZnO nanoparticles showed excellent antibacterial activity, especially for Escherichia coli.     

Effects of ZnO nanoparticles on the mechanical and antibacterial properties of polyurethane coatings

Polyurethane-based coatings reinforced by ZnO nanoparticles (about 27 nm) were prepared via solution blending. The ZnO/PU films and coats were fabricated by a simple method of solution casting and evaporation. The mechanical properties of the films were investigated by a universal material test, and the abrasion resistance of the prepared coats was evaluated by a pencil-abrasion-resistance tester. It was found that significant improvement of the PU films in Young’s modulus and tensile strength was achieved by incorporating ZnO nanoparticles up to 2.0 wt%, and that the abrasion resistance of the PU coats was greatly enhanced due to the addition of ZnO nanoparticles. Moreover, the antibacterial property test was carried out via the agar dilution method and the result indicated that PU films doped with ZnO nanoparticles showed excellent antibacterial activity, especially for Escherichia coli.     

Critical role of particle/polymer interface in photostability of nano-filled polymeric coatings

Nanoparticle-filled polymeric coatings have attracted great interest in recent years because the incorporation of nanofillers can significantly enhance the mechanical, electrical, optical, thermal, and antimicrobial properties of coatings. Due to the small size of the fillers, the volume fraction of the nanoparticle/polymer interfacial area in nano-filled systems is drastically increased, and the interfacial region becomes important in the performance of the nano-filled system. However, techniques used for characterizing nanoparticle/polymer interfaces are limited, and thus, the mechanism by which interfacial properties affect the photostability and the long-term performance of nano-filled polymeric coatings is not well understood. In this study, the role of the nanoparticle/polymer interface on the ultraviolet (UV) stability of a nano-ZnO-filled polyurethane (PU) coating system was investigated. The effects of parameters influencing the particle/polymer interfacial properties, such as size, loading, surface modification of the nanoparticles, on photodegradation of ZnO/PU films were evaluated. The nature of the interfacial regions before and after UV exposures were characterized by atomic force microscopy (AFM)-based techniques. Results have shown that the interfacial properties strongly affect chemical, thermo-mechanical, and morphological properties of the UV-exposed ZnO/PU films. By combining tapping mode AFM and novel electric force microscopy (EFM), the particle/polymer interfacial regions have been successfully detected directly from the surface of the ZnO/PU films. Further, our results indicate that ZnO nanoparticles can function as a photocatalyst or a photostabilizer, depending on the UV exposure conditions. A hypothesis is proposed that the polymers in the vicinity of the ZnO/PU interface are preferentially degraded or protected, depending on whether ZnO nanoparticles act as a photocatalyst or a photostabilizer in the polymers. This study clearly demonstrates that the particle/polymer interface plays a critical role in the photostability of nano-filled polymeric coatings.     

提升单组分水性木器涂料性能的高质量聚氨酯分散体

探讨了自交联型聚氨酯分散体Hypomer WPU-3401在单组分水性木器涂料中的应用。试验表明,其克服了传统的丙烯酸乳液与聚氨酯分散体在耐水性、耐醇性、抗粘连性方面的不足,并具有优秀的施工性、成膜性、耐磨性、硬度和凸显木纹的表观效果,是一支在DIY木器涂料市场以及工业木器涂料市场用于单组分木器涂料体系的具有吸引力的树脂产品。     

纳米改性聚氨酯涂料在海洋大气及飞溅区的应用研究

介绍了纳米氧化锌浆和纳米改性聚氨酯涂料的制备。通过扫描电镜(SEM)、交流阻抗(EIS)技术、光泽度仪和表面接触角测量仪等分析研究海洋大气和飞溅区环境中纳米改性聚氨酯涂料的耐腐蚀性和抗老化性,探讨了纳米氧化锌浆对聚氨酯涂料性能的改进作用。试验结果表明适量纳米浆提高了聚氨酯涂料的综合使用性能。     

软段对水性聚氨酯木器涂料性能的影响

合成了系列水性聚氨酯乳液,研究了低聚物多元醇种类及分子量不同对水性聚氨酯涂料性能的影响。结果表明:聚酯型水性聚氨酯随着软段分子量的增大结晶程度增加,机械强度和硬度较聚醚型高,耐水性较好;结构规整,易结晶的软段合成出的聚氨酯树脂力学性能和耐水性能都较好;而有机硅氧烷改性可以提高聚氨酯材料的耐水性。     

溴化环氧对聚氨酯涂料的阻燃改性研究

通过使用溴化环氧树脂对聚氨酯涂料进行的阻燃改性,制得了具有阻燃功能的聚氨酯涂料。研究了溴化环氧及协同剂Sb2O3用量对聚氨酯涂料阻燃性能和涂膜硬度、光泽度的影响。结果表明当溴化环氧用量为10%,在3%的Sb2O3协同作用下,可将聚氨酯涂料的极限氧指数(LOI)从18提高到30,同时能保证聚氨酯涂料优良的物理机械性能。     

高性能水性聚氨酯涂料的研制

针对水性聚氨酯涂料普遍存在耐水、耐溶剂性能差、固化涂膜硬度低等缺点,通过在水性聚氨酯涂料的制备过程中引入半干性油、单体及乙烯基三乙氧基硅烷改善其性能。在半干性油的氧化交联与乙烯基三乙氧基硅烷自交联的共同作用下,涂膜的交联密度变大,性能明显提升。     

PU大单体改性丙烯酸酯乳液聚合技术及其应用

介绍了一种用于水性木器涂料里的聚氨酯改性丙烯酸酯乳液,主要是通过合成含有带双键的聚氨酯大单体,然后将其成功引入到丙烯酸酯核壳乳液聚合中,综合了两方面的性能优势,应用于水性木器涂料,具有硬度高、成膜性好、抗黏连好的特点。