航空涂料户外曝晒与加速老化中失光率的研究

本文通过对比航空涂料在户外曝晒和室内加速老化中失光率的研究,得出的结论是1000h加速老化相当于2.5年户外曝晒的失光率.     

户外曝晒与加速老化中航空涂料失光率的研究

通过对比航空涂料在户外曝晒和加速老化中的失光率，得出结论：１０００ｈ加速老化相当于２．５年户外曝晒的失光率。     

低针孔率釉面重烧失光的原因分析

针对低针孔率釉料重烧过程中失光的问题,本文采用SEM、EDX、XRD、梯度温控烧结等分析手段,研究釉面失光的原因。研究结果表明,在重烧过程中釉面表层产生板状形貌的析晶是导致失光的主要原因。通过调整釉料配方、降低Mg含量,能够有效解决釉面重烧失光的问题。     

彩钢板涂层加速老化与自然曝晒试验的当量加速关系研究

为研究彩钢板建筑涂层加速老化试验与自然暴晒试验的当量加速关系,以兰州地区为例,对镀锌钢板表面涂红、白、蓝3种颜色烤漆的试件进行了5个周期的加速老化试验和户外5个季度的自然曝晒试验。研究分析了3种颜色样板不同加速周期和曝晒时间的防护涂层失光、变色、粉化、起泡等老化现象,并基于失光率的失效标准,对加速老化和自然曝晒的彩钢板建筑表面涂层老化行为进行分析。研究表明,加速老化试验可以再现自然老化特征。考虑到涂层老化特征的多属性和动态性,针对不同颜色涂层采用多种拟合方法对两组实验数据进行拟合分析,选用3种拟合方法并结合相关函数描述失光率及老化特征量随时间的变化规律,构建出3种颜色样板涂层当量加速关系的表示形式,并得到加速老化试验环境谱与户外自然曝晒试验的当量加速关系为：红色样板0.80季度/周期,白色样板1.03季度/周期,蓝色样板0.93季度/周期。     

氟丙防腐涂料的耐候性研究

运用冷拼法制备氟丙树脂并配制了氟丙防腐涂料,比较研究了其与氟碳树脂涂料、含羟基丙烯酸树脂涂料性能及耐老化性能。结果表明:氟丙涂料比氟碳涂料具有更高的光泽度,比丙烯酸涂料有更好的耐候性,树脂含氟量与涂料的光泽度和失光率之间存在线性对应关系,含氟量增加,光泽度和失光率均线性降低。     

纳米涂料光学性能和抗老化特性表征和评价

纳米涂料中具有优良光学性能和抗老化特性的纳米材料有TiO2、S iO2、ZnO、ATO等;其特性表征方法为测定紫外-可见-红外光透射光谱和老化前后失光程度、失光率、变色程度和色差值;其抗老化特性评价方法为评定其失光等级和变色等级。本文对纳米涂料光学性能和抗老化特性的表征和评价方法进行研究。     

三种油型改性醇酸聚氨酯树脂耐人工加速老化性能研究

利用合成脂肪酸、椰子油或豆油改性醇酸树脂,与HDI固化剂混合后制备白色聚氨酯膜,通过QUV试验研究了不同油型改性醇酸聚氨酯涂膜的色差(△E)、失光率和黄变(△b)等情况。结果表明:在1 000 h试验中,涂膜△E主要由△b引起,而失光率很小,即粉化很小;在耐人工老化光泽损失方面,椰子油改性树脂为2级,另2种均为1级;这3种改性醇酸树脂耐黄变性能的优劣顺序为合成脂肪酸改性树脂椰子油改性树脂豆油改性树脂。     

水性面漆涂膜失光的判定与改善

介绍了水性面漆涂膜失光的主要表现,造成涂膜失光的影响因素及现场调整措施。     

聚氨酯防腐涂层实验室光加速老化对比研究

基于聚氨酯防腐涂层/碳钢体系,进行人工氙灯加速老化试验及荧光紫外(UVA、UVB)光加速老化试验,通过颜色变化及失光率变化说明老化前后宏观性能的改变,用扫描电子显微镜(SEM)及衰减全反射-傅里叶红外光谱(FT-IR)分析老化前后微观形貌结构特征的变化。结果表明:在3种实验室光加速老化试验中,样品的色差均呈现上升趋势,而失光率的变化趋势差异显著;通过微观形貌结构分析样品的变化可知,氙灯加速老化试验中,聚氨酯前期以水解降解方式为主,老化后期发生光氧化降解;而荧光紫外加速试验以光氧化降解为主,UVA老化的光氧化降解主要发生在试验后期,UVB老化的光氧化降解主要发生在试验前期。     

帝斯曼太阳能防反射涂层效率高

帝斯曼日前推出太阳能防反射涂层系统,该系统可以有效提高转换效率。 这种新型太阳能防反射涂层系统采用浸润或喷涂工艺,将特殊的涂料涂覆于超白光伏太阳能玻璃表面。其独特的纳米单层结构将太阳能玻璃片的光透过率提高了大约4％,太阳能电池组件效率由此得到相当大的改善。这种涂层系统提供了最佳的光透过率、耐用性和灵活性。     

提高银白珠光颜料质量的工艺研究

以生产钛白粉的中间产物硫酸氧钛为原料,用尿素作中和剂,制备银白珠光颜料。研究了钛液中铁的含量、终点pH值、尿素加入量、升温速率和反应时间,以及加入不同掩蔽剂对云母钛珠光颜料产品白度和亮度的影响。试验结果表明,利用冷冻除铁后的钛液,调节终点pH值为1.5,尿素与TiO2质量比为(5～7)∶1,缓慢升温反应4～5h,并加入硅酸盐等掩蔽剂后,所得银白珠光颜料与纯硫酸氧钛所制的产品白度相当,且亮度很好。     

TiO2 pigment structure and kinetics of PVC weathering

The influences of doping the core of TiO₂ pigments with Al₂O₃ and of various inorganic surface modifications on the rate of poly(vinyl chloride) (PVC) weathering are investigated. The kinetics of loss of gloss are transformed into photooxidation rates by using Weibull statistics of failure, and a scheme of two consecutive reactions is fitted to the intermediate losses of brightness observed for the most photoactive pigments. When Ca/Zn stabilizers in PVC are exchanged for Pb stabilizers, gloss degradation rate doubles, and the energetic spread of irradiation defects broadens. No indications for specific interactions between pigment and stabilizer are found.     

金红石型钛白粉在醇酸调和漆中的应用

醇酸调和白漆常使用锐钛型钛白粉作为颜料,但涂膜的耐候性和使用寿命不尽如人意,改用耐候性更好的金红石型钛白粉作为着色颜料,在保光性、保色性、耐久性等方面都有大幅提高,是值得大力推广的第二代醇酸调和漆。     

一种改性PE白色底漆的研制

用80％DCPD合成一种气干性良好的不饱和聚酯。制备的PE白色底漆不仅成本低，而且涂膜光泽高、丰满度好、施工性能好，并探讨了影响PE白色底漆的因素。     

A mechanistic study of the effect of pigment loading on the appearance of powder coatings: The effect of surface topography on the optical properties of powder coatings: Modelling and experimental results

Gloss is a critical property for many powder coating applications and is related to the amount of light reflected by the coating layer on a substrate. Gloss of powder coatings can, depending on the composition, vary from excellent to matt. It is well known in the powder coatings industry that increasing loadings of pigment, especially TiO₂, causes a detrimental loss of gloss. In order to understand the cause of this phenomenon two questions have to be addressed: firstly, what is the relation between the optical properties and the surface topography of the powder coating and, secondly, how do the powder coating composition and curing conditions affect the surface topography? In order to answer the first question, the typical features of the surface of a cured powder coating have been studied in detail. Using a white light interferometer, it has been shown that the surface topography consists of both short wave and long wave patterns. Each of these patterns could be described by using two statistical parameters only, the root mean square height of the roughness and its correlation length. The effect of both the short and long wave roughness on the gloss has been simulated with a single wave pattern model, based on an approximation of the Kirchoff scattering theory [9]. These simulations illustrated that neither the short nor the long wave roughness on itself determines the optical properties. In order to quantify the combined effect of the long and short wave surface features a two-scale modelling approach was followed. The predictions of this model were in good agreement with experimental gloss data of coatings containing different amounts and types of pigments.     

Quantification and prediction of visually perceived specular gloss at three illumination/viewing geometries

In the present study, attempts were made to clarify the existence of a correlation between visually perceived and instrumentally measured specular gloss of a series of achromatic samples. To this end, seven achromatic physical scales of specular gloss each consisting of 10 or 11 samples were prepared using lithographically printed black, white, and five in between gray papers. The samples were visually assessed and subsequently quantified in terms of a visually uniform color constant lightness scale, by a panel of 14 observers in an especially designed unidirectional light compartment at three illumination/observation geometries, namely 20°/20°, 60°/60°, and 85°/85°. Four statistical parameters were utilized to determine the correlation between visually perceived and instrumentally measured specular gloss. The results show that the instrumental 60°/60° geometry is capable of efficiently quantifying the equivalent specular gloss as perceived by a human observer. Surprisingly, it was also possible to accurately predict the visually quantified specular gloss both at the 20° and the 85° geometries by the aid of applying special linear relationships derived from the instrumentally measured specular gloss of the 60° geometry.     

Visual gloss scaling and multidimensional scaling analysis of painted specimens

Painted panels were prepared in a wide range of gloss and in three achromatic colors (white, middle grey, and black) by varying the composition and heat treatment of an automotive acrylic-lacquer system. Magnitude scaling was used to estimate visual dissimilarities between the members of all possible pairs of specimens in series of 15–20 samples. The data were analyzed by multidimensional scaling using several commercially available computer programs. The experiments were carried out and the results are discussed for evaluation of several types of gloss: distinctness-of-image, specular, contrast, sheen, and reflection haze. The resulting interval scales were all unidimensional. The visual data were correlated with a variety of instrumental gloss measurements made on the same specimens by using commercially available glossmeters.     

紫外光固化法制备漆酚铁聚合物涂料的研究

通过紫外光固化法快速便捷地由漆酚和三氯化铁制备了色泽乌黑、表面平整光亮的漆酚铁聚合物。当漆酚和氯化铁的物质的量比为3∶1,紫外光辐照20s时,漆膜具有优良的常规物理机械性能:光泽度132%,硬度6H,冲击强度50kg.cm,柔韧性0.5mm,附着力1级;良好的抗紫外线性能:紫外光辐照1200h以后,其失光率仅为4.85%;良好的耐热性能:受热320℃时失重5%;优异的抗化学介质性能。     

无锆低温绢光玉白釉的研制

在低温烧成制度下，所制无锆无毒廉价生釉表面呈现出稳定的绢样光泽的玉白色，平滑柔润，毫无浮光。