碳弧气候箱光源的改装

氙灯的光谱在现有的人工光源中,是最接近太阳光谱的,所以1958年氙灯在西德一问世就引人注目。1961年国际标准化组织(ISO)曾推荐氙灯为材料耐光、耐热性试验的人工老化光源。目前国内现有的气候箱,不管是进口的还是国产的,大多数都是用碳弧作光源。由于碳     

关于氙灯老化和户外大气自然暴晒的综述

现阶段,模拟太阳光谱比较接近的人工加速老化试验主要是氙弧灯和碳弧灯。但是很多国家普遍认为氙灯是目前模拟太阳光最佳的一种光源,已经逐渐代替了碳弧灯气候老化。     

建筑外墙涂料在不同人工加速老化光源下耐候性能的研究

将建筑外墙涂料分别暴露在氙灯、荧光紫外灯和碳弧灯等不同的老化光源下进行人工加速老化试验,通过对比研究老化前后涂层宏观光学性能、微观形貌和分子结构的变化规律,探讨这三种老化试验方法对建筑外墙涂料耐候性能的影响。     

非金属材料曝露设备及实施方法国标简介

前言氙灯是被公认为模拟太阳光的最佳光源,氙弧型人工曝露设备早已在国内、外广泛用于非金属材料曝露试验。目前国际标准化组织及一些发达国家的标准化机构,已分别制定出以氙灯为光源的非金属材料曝露试验方法。我国也先后制订了涂料、料塑、橡胶和纺织品等非金属材料的曝露试验方法     

不同光源对光催化降解亚甲基蓝的影响

用长弧氙灯、中压汞灯、高压汞灯、镓灯、镝灯等几种光源对光催化降解亚甲基蓝的效果进行了比较。结果证明镓灯的效果最好 ,其降解速率高于其它光源 ,所得到的反应速率常数是常用中压汞灯的 1 .2 4倍。从光子对Ti O2 的作用机理及光谱分析结果可以证明 ,光源的紫外部分辐射强度愈高对反应愈有利。并为光催化反应中光源的选择提供了一定的依据。     

氙灯老化机和紫外型碳弧灯老化机的光源性能比较

一、试验的目的和意义人工加速老化试验在国外已经进行了四十多年,国内也有十几年的历史了。目前人们普遍感到现有的老化机试验结果的可靠性捉摸不定,试验的速度也太慢。这就向从事人工加速老化试验的工作者提出了一项迫切而艰巨的任务:如何在模拟性满意的情况下加快老化的速度。大家都知道,光源是老化的最主要的因素,因此我们打算在碳弧灯和氙灯老化机中固定其它主要试验条件来对比这两种光源的模拟性和加速性,为今后的加速老化试验提供比较坚实的基础。     

广州合成材料研究院

氙灯人工气候老化试验箱LHS—X65系列,主要是采用6．5KW长弧水冷氙灯为光源,通过改变、控制光辐照度、温度（样品架温度、工作室温）、相对湿度、喷淋方式等方式,模拟户外气候的光、热和降雨等综合条件,对样品进行人工老化试验,可以为科研、产品开发和质量控制提供相应的环境模拟和加速试验。     

广州合成材料研究院

氙灯人工气候老化试验箱LHS-X65系列,主要是采用6．5KW长弧水冷氙灯为光源,通过改变、控制光辐照度、温度（样品架温度、工作室温）、相对湿度、喷淋方式等方式,模拟厂’外气候的光、热和降雨等综合条件,对样品进行人工老化试验,可以为科研、产品开发和质量控制提供相应的环境模拟和加速试验。     

广州合成材料研究院

氙灯人工气候老化试验箱LHS—X65系列，主要是采用6．5KW长弧水冷氙灯为光源，通过改变、控制光辐照度、温度（样品架温度、工作室温）、相对湿度、喷淋方式等方式，模拟户外气候的光、热和降雨等综合条件，对样品进行人工老化试验，可以为科研、产品开发和质量控制提供相应的环境模拟和加速试验。     

以丙烯酸酯类为基料的着色有机玻璃的耐光性

用偶氮染料和蒽醌染料着色成红色和绿色的丙烯酸酯基有机玻璃,在苏联捷尔任斯基市(温带气候)和塔什干市(干热气候)进行三年自然气候老化,还在—400型水银灯为光源的气候箱、以碳弧灯为光源的CT 2—4—2气候箱和以氙灯为光源的—3     

国内外实验室光源加速老化试验设备

介绍国内外实验室光源老化试验设备中最常使用的光源的特征、发展及设备的结构特点,并以户外太阳光源相似程度的角度,分析了碳弧灯、氙弧灯、荧光紫外灯及金属卤灯的优缺点。     

抗老化PP扁丝编织土工布专用料的研制

选择国产基础树脂与稳定剂，采用碳弧灯和B型荧光紫外灯人工加速老化试验，研究了光稳定剂品种、用量、与抗氧剂的复配及色母粒、重钙母粒对专用料老化性能的影响。与添加Ciba精化公司MB218母粒的抗老化聚丙烯(PP)性能的对比及应用试验结果表明，PP扁丝编织土工布抗老化性能优良。     

UV curing and matting of acrylate nanocomposite coatings by 172 nm excimer irradiation

For UV-curable acrylate coatings reinforced by silica nanoparticles, the effect of 172 nm excimer irradiation on the surface roughness has been studied. A dual UV lamp set-up consisting of a 172 nm excimer lamp and a mercury arc lamp allowed obtaining gloss levels down to 0.5 units (at 60°) depending on the acrylate formulation and curing conditions. Moreover, UV matt-finished sample showed enhanced surface hardness and increased chemical resistance. It is assumed that 172 nm excimer irradiation resulted in a higher network density via additional cross-linking reactions.To study the depth profile of acrylate conversion for coatings cured by the combination of a 172 nm excimer lamp (accountable for surface curing) and a mercury arc lamp (responsible for through curing), FTIR microscopy as well as (Ge)ATR-FTIR having an IR penetration depth of less than 0.5 μm have been applied. Providing the presence of a photoinitiator as well as the absence of oxygen inhibition, similar degrees of double bond conversion of about 90% were observed on the entire area of the cross-section of the coating, i.e. the wavelength of UV irradiation was found to have no significant impact on acrylate conversion.     

氙灯加速老化对聚酯纤维/PVC柔性复合材料力学性能影响的研究

聚酯纤维/PVC柔性复合材料由于多用于户外,易受阳光照射而老化,从而影响材料的力学性能。通过模拟大气环境较好的氙灯耐气候试验箱,考察了氙灯加速老化对聚酯纤维/PVC柔性复合材料顶破性能和撕裂性能的影响。采用CRT材料试验机,研究了聚酯纤维/PVC柔性复合材料的顶破性能和撕裂性能的变化,并比较了两种不同撕裂模式的破坏机理;采用FTIR研究了PVC涂层吸收峰和峰强的变化;采用SEM研究老化前后涂层表面的微观形貌。研究表明:氙灯人工气候老化下,聚酯纤维/PVC柔性复合材料的老化机理主要是羰基化合物和共轭双键的形成;柔性复合材料撕裂性能下降明显;不同撕裂模式对评价柔性复合材料差异较大。     

Bromate Destruction by UV Irradiation and Electric Arc Discharge

Bromate ion destruction by UV irradiation using either a low pressure mercury lamp or a medium pressure mercury lamp has been evaluated. A low pressure lamp which emits radiation predominantly at < 200 nm was more effective than the UV lamp which emits radiation at 254 nm, since bromate ion has a peak absorbance of about 195 nm. Bromate ion was shown to be reduced to bromide ion with bromine as an intermediate. Bromate ion destruction using a low pressure mercury lamp (< 200 nm) ranged from 3 to 38% for doses ranging from 23 to 228 mW-s/cm²; 7-46% destruction was achieved using a medium pressure lamp with initial bromate ion concentrations of 11-38 μg/L and doses ranging from 60 to 550 mW-s/cm². A new innovative electric arc discharge method also has been evaluated and compared with UV irradiation. The electric arc discharge method destroyed 12-45% bromate ion for doses ranging from 130 to 1300 mW-s/cm².     

UV absorber aftertreatment to improve lightfastness of natural dyes on protein fibres

The effect of a UV absorber on the lightfastness of natural dyes has been investigated. Wool and silk fabrics, dyed with natural dyes with or without mordants, were aftertreated with two UV absorbers. This treatment improved the lightfastness of the mordant-dyed fabric without affecting its colour or shade. The extent of photofading was evaluated by measuring the colour difference, Δ E , of the dyed sample before and after a 20 h period of irradiation under a xenon arc lamp. The uptake of the UV absorber on wool was much higher than that on silk.     

UVA-340 exposure of automotive materials: A status report

A comparison of the spectral distributions of sunlight, xenon arc (SAE J1885), FS-40 (Q-U-V), and UVA-340 (Q-U-V) indicates that, based on the short wave cut off of the source (1), the FS-40 lamp is inappropriate for testing many plastics, (2) the xenon are also emits short wave UV that may cause misleading results on some materials, and (3) the UVA-340 lamp is an excellent simulation of sunlight in the short wave region. Data from comparative testing between the UVA-340, Florida, and xenon are shows surprisingly good correlations for color shift direction and rank order.     

Influence of natural and accelerated weathering on performances of photoselective greenhouse films

The research aims to investigate the effects of natural and accelerated weathering on polyethylene‐based films. At this regard, monolayer films of low density/linear low density polyethylene blends, containing commercially available organic pigments and an UV absorber of the benzophenone type, have been considered. The samples were weathered on field (natural weathering) or using two different artificial procedures: UV lamp and QUV chamber. Conditioned film samples were, then, analyzed by performing several physical tests taking as‐received films as a reference. Rheological measurements showed an increase in viscosity of weathered sample melts as a consequence of photodegradation phenomena, inducing the formation of double bonds and crosslinks. This latter result was also confirmed by gel content measurements. UV–visible spectroscopic tests indicated that in both cases of natural and artificial weathering an increase of the transmittance of films occurred. Tensile tests indicated the increase of films stiffness, especially in case of samples conditioned using the UV lamp, and a large decrease of the strain at break, both in machine and in transverse directions, especially for film weathered using the QUV chamber. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013