纳米材料在涂料中的应用进展

综述了纳米材料在涂料中的应用及其表现的优异性能(光催化、耐老化、隐身等),介绍了纳米涂料制备中纳米材料的分散方式,指出了纳米材料在涂料中应用的一些难点。     

水性木器涂料在木质餐椅流水线涂装中的应用

介绍了木质餐椅流水线常见涂装工艺、设备及对涂料的性能要求;根据水性木器涂料的特点,选择了一个合适的涂装领域:木质餐椅流水线涂装,在生产过程中代替溶剂型涂料,降低了发生火灾的级数,减少了VOC排放,保护了环境、节能降耗。对水性木器涂料应用领域的扩大和推广具有重要的意义。     

涂料树脂的相容性

讨论了涂料用共混树脂的相容性以及提高其相容性的主要途径,对部分相容树脂的形态及其对性能的影响作了介绍。     

助剂对反射隔热弹性涂料性能的影响

在选取丙烯酸乳液为基料,金红石型钛白粉为颜料,空心玻璃微珠、滑石粉和高岭土等为填料的基础上,探讨分散剂、消泡剂、耐沾污剂和pH值调节剂等对反射隔热涂料性能的影响,优化各种助剂在涂料中的最佳用量,以期指导隔热涂料配方设计。     

Drying regime maps for particulate coatings

Key microstructural properties of particulate coatings such as porosity and particle order are established during drying. Therefore, understanding the evolution of particulate distributions during drying is useful for designing coating properties. Here, a 1D model is proposed for the particle distribution through the coating thickness at different drying times and conditions, including Brownian diffusion, sedimentation, and evaporation. Effects of particle concentration on diffusion and sedimentation rates are included. Results are condensed onto a drying regime map which predicts the presence of particle surface accumulation or sediment based on two dimensionless numbers: the Peclet number and the sedimentation number. Cryogenic scanning electron microscopy (cryoSEM) is used to image the transient particulate distributions during the drying of a model system comprised of monodisperse silica particles in water. Particle size and evaporation rates are altered to access various domains of the drying map. There is good agreement between cryoSEM observations and model predictions. © 2010 American Institute of Chemical Engineers AIChE J, 2010     

BaSO4‐, CaF2‐, and Al‐Maleate‐Derived Nanocomposite Coatings with Excellent Mechanical,Thermal, and Optical Properties

Acrylate‐based nanocomposite coatings prepared from uniformly sized, nanoscaled inorganic, i.e., BaSO₄‐ and CaF₂‐ as well as organometallic, i.e., Al‐maleate‐derived nanoparticles were prepared applying photochemical curing. Excellent mechanical and thermal stability as well as high optical transparency was achieved as compared to standard SiO₂‐based coatings. The performance of CaF₂‐based nanocomposites could be further enhanced by addition of nanocorundum. A comprehensive data set on surface and Martens hardness, the penetration depths, glass transition temperatures, and UV–Vis transparency of the final coatings is presented.

     

Functionalized MWNT‐Doped Thermoplastic Polyurethane Nanocomposites for Aerospace Coating Applications

Targeting specific aerospace coating applications, highly conductive carbon nanotubes were rigorously dispersed into a commercial topcoat PU matrix to produce nanocomposites for electrostatic dissipation and/or de‐icing coatings. Systematic evaluation on a range of properties that are pertaining to the targeted applications showed that, comparing with pure PU film, an addition of 1 wt.‐% functionalized MWNTs resulted in a significant improvement in the tensile strength and modulus; a 6.5 °C shift in glass transition temperature; a six orders of magnitude decrease in electrical resistivity and 24% improvement in thermal diffusivity. The durable, light color, and flexible nanocomposite with sufficiently low surface resistivity meet the requirements for aerospace coating applications.

     

Scratch Resistance Enhancement of Polymer Coatings

This review presents the state of the art regarding the improvement of scratch resistance of polymeric coatings. In particular, our attention is focused on the effect of inorganic nanometric fillers on the scratch resistance of organic coatings. Two main strategies are described for the achievement of such nanostructured hybrid organic/inorganic coatings: either a top‐down or a bottom‐up approach.

     

Wear mechanisms description in nanoscale by SEM/TEM of multilayer Zr/ZrN coatings in dependence on phases ratio

As a result of loading with an external force during the wear process, coating deforms uniformly. After a certain limit load is exceeded, coating deformation is localised through the formation of the so-called shear bands. It has been showed experimentally the process of shear bands formation. The microstructural characterisation before and after the mechanical tests was performed using scanning and transmission electron microscopy (SEM and TEM) on cross-sections of the samples. The analysis indicated that in the case of multilayer coatings where the ratio of the metallic to the ceramic phase is 1:1, the shear bands are formed at an angle of 45°. With a greater proportion of the ceramic phase to metallic (ratio 1:2), the shear band changed the shear angle from ∼45° to ∼90°. Mechanical in situ tests were carried out in the chambers of SEM and TEM. The scratch tests in the SEM were done with the simultaneous observation of the phenomena occurring on the surface of the tested materials showed that at a scratch force of 0.04 N, the additional outer a-C:H layer was damaged, which was shown in the form of a fault in the force–displacement diagram, and in the form of splits visible in the SEM image. However, the application of this additional layer had a positive effect on the wear mechanism of the entire coating structure. The test also indicated that in the case of coatings with phases ratio 1:2 and 1:4 (metallic to ceramic), the characteristics of the brittle material were demonstrated, unlike the coating with a 1:1 phase ratio, where plastic properties predominated. However, for the 1:2 phase ratio coating, the chip was more ductile than for the chip formed when testing a 1:4 phase ratio coating. For in situ mechanical testing in the TEM, a straining holder was used. The test showed that the shear band angle for a 1:1 ratio coating has changed from 45° to 90° due to the different direction of force interaction.     

富马海松酸环氧树脂的制备及漆膜性能

通过松香(RA)与富马酸(FA)高温下的Diels-Alder反应合成了富马海松酸(FPA),并利用碳谱(13CNMR)、电喷雾质谱(ESI-MS)、红外光谱(IR)对其进行了表征;通过FPA与丁二醇二缩水甘油醚(BDGE)、己二醇二缩水甘油醚(HDGE)的酯化反应合成了松香基环氧树脂预聚体(FB、FH),测试了预聚体与固化剂不同配比下固化物的漆膜性能;结果表明,当n(活性氢)/n(环氧基)在1.0、1.2时,漆膜的硬度大于HB,附着力小于2级,T-弯实验小于2 T,耐冲击强度大于9.8 J,耐化学性能良好。