摘要
目前,氙灯加速老化试验是评估材料耐候效果最常用的一种方法。但是,关于该测试方法是否能客观反应材料实际使用过程中的颜色、力学变化规律的相关数据积累非常少。详细对比了两种测试条件对材料耐候效果的影响,结果表明,在定性评估方面,不同耐候剂组合在两种老化试验中的优劣顺序基本上保持一致,说明氙灯加速老化试验可以比较客观地反映材料在自然使用过程中的颜色变化;而定量方面,在老化初期,两种测试方法的结果比较接近;而随着老化时间的增长,氙灯老化条件下材料的色差开始呈现指数型增长,远远高于户外自然老化。造成上述现象的原因可能包括两点,一是氙灯老化测试时的温度更高,树脂和色粉等更容易发生降解;二是材料表面的耐候剂在氙灯测试中消耗过快,内部的耐候剂无法及时补充,因此造成自由基大量生成,导致老化加速进行。
At present,the accelerated aging test of xenon lamp was the most commonly used method to evaluate the weather resistance of materials.However,there was little relevant data accumulation as to whether the test method can objectively reflect the color and mechanics changes in the actual use of materials.The effects of the two test conditions on the weathering effect of the material were compared.The results show that in terms of qualitative evaluation,the order of advantages and disadvantages of different weathering agent combinations in the two aging experiments is basically the same,indicating that the xenon lamp accelerated aging experiment can be more objective reflects the color change of the material during natural use.Quantitatively,in the early stage of aging,the results of the two test methods are relatively close.As the aging time increases,the color difference of the material under the aging condition of the xenon lamp begins to show an exponential increase,much higher than the natural aging outdoors.The reasons for the above phenomenon may include two points.One is that the temperature of the xenon lamp aging test is higher,and the resin and toner are more prone to degradation.The second is that the weathering agent on the surface of the material is consumed too quickly in the xenon lamp test,and the internal weathering agent cannot be refilled in time,which causes a large number of free radicals to be generated,leading to accelerated aging.
作者
冯德才
黄牧
叶坤豪
许鸿基
郑一泉
丁超
FENG De-cai;HUANG Mu;YE Kun-hao;XU Hong-ji;ZHENG Yi-quan;DING Chao(National-certified Enterprise Technology Center,Kingfa Science and Technology Co.,Ltd.,National Engineering Laboratory for Plastic Modification and Processing,Guangzhou 510520,China)
出处
《塑料工业》
CAS
CSCD
北大核心
2021年第3期91-94,148,共5页
China Plastics Industry
关键词
氙灯加速老化
户外自然老化
耐候评估
辐照度
光老化机理
Xenon Lamp Accelerated Aging
Outdoor Natural Aging
Weather Resistance Evaluation
Irradiance
Light Aging Mechanism
