Shrinkage of polymer coatings on wood veneers in aircraft structure: understanding the causes of the problem and possible solution

飞机结构中木质单板聚合物涂层的收缩：了解问题的原因和可能的解决方案

• 批准号: 429039-2011
• 负责人: Bazuin, Géraldine
• 金额: $ 8.74万
• 依托单位: Université de Montréal
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2013
• 资助国家: 加拿大
• 起止时间: 2013-01-01 至 2014-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=532649
• 关键词: Shrinkage; polymer; coatings; wood; veneers

A common problem in aircraft cabinetry is deterioration in the appearance of "wet-look" or high gloss finishes that causes them to eventually resemble the surfaces of orange peels (giving the so-called "orange-peel look"). This is attributed to some kind of dimensional instability (or shrinkage) in the varnish covering the cabinetry veneers. Possible sources of the problem include the nature of the varnish, its interactions with the wood and the ways in which they evolve over time, as well as the different environmental conditions (particularly temperature and humidity) to which the aircraft cabinetry are exposed during their manufacturing and usage (when landed, the aircraft doors are opened to widely varying climates, like hot and dry desert climate, hot and humid coastal climate, and cold and dry "siberian" climate). The problem causes significant loss of time and money to companies like Bombardier Aerospace, because they must frequently rework the cabinetry surfaces in the face of customer complaints and to meet the expectations of their customers. The high cost of the regional and business aircraft sold by Bombardier Aerospace provides an opportunity to try to get to the bottom of this problem, and thereby help Bombardier maintain a competitive edge internationally. The implication of 3M Canada is their interest in understanding the underlying factors that give rise to the present problems in order to help identify solutions. Therefore, in this project, we will try to understand in detail the reasons for the problem by analyzing both the varnish and veneer properties and interactions, and their evolution over time when exposed to different temperatures and levels of humidity, using a large variety of appropriate scientific techniques that involve both chemists and wood scientists. With the information gained, we hope to supply Bombardier and 3M Canada with possible solutions that we will also test. We anticipate that the information gained will also be useful generally for veneer varnishes, and thus benefit a wide range of Canadian industry.

飞机机舱的一个常见问题是“湿外观”或高光泽度涂层外观的恶化，这导致它们最终类似于橙皮的表面(产生所谓的“橙皮外观”)。这归因于覆盖细木工板的清漆中的某种尺寸不稳定(或收缩)。问题的可能来源包括清漆的性质、它与木材的相互作用和它们随时间演变的方式，以及飞机机舱在制造和使用过程中暴露在不同的环境条件(特别是温度和湿度)(当飞机降落时，飞机舱门打开时会适应非常不同的气候，如炎热和干燥的沙漠气候、炎热和潮湿的沿海气候以及寒冷和干燥的西伯利亚气候)。这个问题给庞巴迪航空航天等公司造成了巨大的时间和金钱损失，因为面对客户的投诉，他们必须经常返工橱柜表面，以满足客户的期望。庞巴迪航空航天公司销售的支线和商务机的高昂成本提供了一个机会，试图找出这个问题的根源，从而帮助庞巴迪保持国际竞争优势。3M加拿大的含义是他们有兴趣了解导致目前问题的根本因素，以帮助确定解决方案。因此，在这个项目中，我们将试图通过分析清漆和单板的性能和相互作用，以及它们在不同温度和湿度下随时间的变化，使用化学家和木材科学家参与的各种适当的科学技术，来详细了解问题的原因。根据获得的信息，我们希望向庞巴迪和3M加拿大公司提供可能的解决方案，我们也将进行测试。我们预计，所获得的信息也将对单板清漆普遍有用，从而使加拿大的广泛行业受益。