Fully renewable limonene‐derived polycarbonate as a high‐performance alkyd resin

Limonene‐derived polycarbonate‐based alkyd resins (ARs) have been prepared by copolymerization of limonene dioxide with CO₂, catalysed by a β‐diiminate zinc–bis(trimethylsilyl)amido complex, and subsequent chemical modification with soybean oil fatty acids using triphenylethylphosphonium bromide as the catalyst. This quantitative partial modification was realized via epoxy–carboxylic acid chemistry, affording ARs with higher oil lengths, lower polydispersities and higher glass transition temperatures (T_g) in comparison to a conventional polyester AR based on phthalic acid, multifunctional polyol pentaerythritol and soybean fatty acid. The novel limonene polycarbonate AR and the conventional polyester AR were evaluated as coatings and both the physical drying (without the presence of the oxidative drying accelerator Borchi® Oxy Coat) and chemical curing (with Borchi® Oxy Coat) processes of these coatings were monitored by measuring the König hardness and complex modulus development with time. A better performance was obtained for the alkyd paint containing polycarbonates modified with fatty acids (FA‐PCs), which showed a faster chemical drying, a higher König hardness and a higher T_g in coating evaluation, demonstrating that the fully renewable FA‐PCs are promising resins for alkyd paint applications. © 2019 Society of Chemical Industry     

Preparation of biaxially textured Ce1-x(Y0.2Zr0.8)xOδ buffer layers on RABiTS NiW tapes by chemical solution deposition

Highly (100)-oriented Ce_1-x(Y_0.2Zr_0.8)_xO_δ (CYZO) films were prepared on biaxially textured NiW substrates by a chemical solution deposition approach using metal inorganic salts as starting materials. It has been found that both the preferential orientation and surface roughness of CYZO films decrease gradually with increasing of the doping percentage of Y³⁺ and Zr⁴⁺ ions. The epitaxial growth relationship of (220)_CYZO//(200)_NiW and [00?l]_CYZO//[001]_NiW was demonstrated by XRD texture measurement as well as atomic resolution STEM observation. XRD, Raman and XPS spectra results indicate that Y³⁺ and Zr⁴⁺ ions were indeed introduced into CeO₂ lattice to substitute Ce⁴⁺ ions and form cubic fluorite CYZO solid solution. Moreover, CeO₂ buffer layer can be endowed a strong enough capability to prevent element diffusion through co-doping of yttrium and zirconium, provided that an optimal doping ratio of them is adopted. This will provide a new approach to fabricating strong-barrier single buffer layer for coated conductor.     

气相二氧化硅生产现状及其在涂料中的应用

介绍了气相二氧化硅国内外生产状况,根据气相二氧化硅在涂料方面的应用特点及主 要技术关键的分析,提出了建议。     

粉末涂料在汽车涂装中的应用

介绍了粉末涂料的组成、优越性以及各种性能，分析了粉末涂料在汽车涂装中的经济性，肯定了粉末涂料在汽车工业中的应用前景。     

水溶性丙烯酸涂料的环氧树脂改性

本实验论述了水溶性丙烯酸钢铁底漆涂料制备、性能以及用环氧树脂对其进行改性。原水溶性丙烯酸钢铁底漆涂料在进行耐盐雾测定试验时仅为 72h ,未通过国家规定标准。本实验的目的在于 ,以丙烯酸树脂为主要成膜物质 ,加入其他的辅助成膜物质 ,如环氧树脂来改善其抗盐雾、抗腐蚀、耐候等性能。结果表明 ,一定温度下在水溶性丙烯酸钢铁底漆涂料中加入 1/ 7的环氧树脂后 ,经测定其耐盐雾性可达 10 6h ,达到了国家的规定标准     

Effect of powder painting procedures on the filiform corrosion of aluminium profiles

In this work, the filiform corrosion behaviour of powder painted aluminium profiles was studied, and the coating barrier properties together with adhesion to the substrate were analysed. Samples coated with a traditional painting procedure (one powder layer application followed by curing), and other samples coated using a special cycle to obtain wood grain effect were compared using accelerated filiform corrosion tests. Moreover, in order to better understand the degradation mechanisms of painted metal substrates, thermal stresses were applied to accelerate the natural weathering. The effects of the thermal aging were analysed by electrochemical impedance spectroscopy.     

钠水玻璃涂料的固化技术及其应用

论述了五种固化剂改性钠水玻璃的原理及在涂料中的应用，重点介绍了用可溶性金属盐必性钠水玻璃制作涂料的技术关键。     

我国建筑涂料技术进步简评

从以下诸方面简述我国建筑涂料的技术进步:⑴新品种涂料的研制开发;⑵加强对配套材料及施工技术的研究;⑶超细填料在涂料中的应用;⑷计算机自动配色技术;⑸产品标准的修订;⑹建筑涂料的实用范围扩大。     

厚膜型无溶剂环氧重防腐涂料的研究

比较了不同环氧树脂、环氧固化剂、颜填料、助剂等的特性,制备了厚膜型无溶剂环氧涂料,并进行了各项性能的检测,结果表明,该涂料具有极低的VOC含量,符合环保要求,适用于要求长效防腐的钢构件。