ABSTRACT

Adhesives and consolidant strength play a major role in many conservation treatments. In industry, adhesive strength is often determined using standardized tests including 90° peel tests. However, not all conservation studios have or can afford mechanical testing equipment for such tests, although it is often readily accessible at third-party facilities. For a university conservation project, an international standard 90° peel test was modified to study the adhesive strength of consolidants for zinc white paints. Consolidants were applied to painting canvas strips, which were then adhered to zinc white paint layers on glass supports. The strips were peeled downward by continually adding fine sand to a cup attached to the end of the canvas strips. Video recordings were made of the continual loading and sudden stepwise extensions of the peeling samples, so that step-wise force - peel length curves could be plotted for each specimen. The data combined with examination of the peeled surfaces provided important qualitative information over strength and toughness (ductility/brittleness) for comparing the tested consolidant-zinc white systems. The adapted peel test is therefore a valuable method for testing adhesives and consolidants in the conservation studio. However, one must avoid overinterpreting the results, since consolidant selection depends on more factors than just mechanical properties.

摘要

粘合剂和固结强度在许多保护处理中起着重要作用。在工业中，粘合强度通常使用标准化测试（包括 90° 剥离测试）来确定。然而，并非所有保护工作室都拥有或能够负担得起进行此类测试的机械测试设备，尽管第三方设施通常很容易获得这些设备。为某大学保护项目修改了国际标准 90° 剥离试验，以研究锌白涂料固结剂的粘合强度。将固结剂涂在画布条上，然后将其粘附到玻璃支架上的锌白油漆层上。通过将细沙不断添加到附在帆布条末端的杯子中，将条带向下剥离。对剥离样品的连续加载和突然逐步延伸进行视频记录，以便可以为每个样本绘制逐步力-剥离长度曲线。数据与剥离表面的检查相结合，提供了关于强度和韧性（延展性/脆性）的重要定性信息，用于比较测试的固结剂-锌白系统。因此，适应性剥离测试是在保护工作室中测试粘合剂和固结剂的一种有价值的方法。但是，必须避免过度解释结果，因为固结物的选择取决于更多因素，而不仅仅是机械性能。数据与剥离表面的检查相结合，提供了关于强度和韧性（延展性/脆性）的重要定性信息，用于比较测试的固结剂-锌白系统。因此，适应性剥离测试是在保护工作室中测试粘合剂和固结剂的一种有价值的方法。但是，必须避免过度解释结果，因为固结物的选择取决于更多因素，而不仅仅是机械性能。数据与剥离表面的检查相结合，提供了关于强度和韧性（延展性/脆性）的重要定性信息，用于比较测试的固结剂-锌白系统。因此，适应性剥离测试是在保护工作室中测试粘合剂和固结剂的一种有价值的方法。但是，必须避免过度解释结果，因为固结物的选择取决于更多因素，而不仅仅是机械性能。