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现行 ASTM D3632-98(2019)
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Standard Test Method for Accelerated Aging of Adhesive Joints by the Oxygen-Pressure Method 用氧压力法测定粘合接头加速老化的标准试验方法
发布日期: 2019-03-01
1.1 本试验方法描述了如何估计放置在高压氧气环境中的胶膜和胶接接头的相对抗劣化能力。说明包括木材对木材和木材对金属的接缝以及游离粘合剂膜。使用含有这些化学品的材料作为粘附物,可以评估阻燃剂、防腐剂或木材提取物等化学品的效果。 1.2 本试验方法主要适用于基于弹性体的建筑粘合剂,但也适用于可能易受氧降解影响的其他类型的粘合剂。由于自然老化条件不同,且不存在水分和应力等因素,因此该加速试验与粘合剂的自然老化并不完全相关。该加速试验的结果仅为比较结果,必须根据已知自然老化和加速老化特性的粘结接头的性能进行评估。 1.3 以国际单位制表示的数值应视为标准值。国际单位制后括号中给出的值仅供参考,不被视为标准值。 1.4 本标准并非旨在解决与其使用相关的所有安全问题(如有)。本标准的用户有责任在使用前制定适当的安全、健康和环境实践,并确定监管限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒(TBT)委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 该测试方法对粘合剂制造商的研发或制造控制非常有用。 结果也可用于规范验收或作为粘合剂选择的指南。 5.2 测试粘结试样和游离薄膜的规定有两个目的。首先,氧和化学品或降解产物之间可能发生相互作用,这可能会影响粘结接头强度的降解。第二,由于氧化交联而导致的强度增加在粘结组件中可能无害,事实上可能有益。这种性能的粘合剂不能通过薄膜柔韧性测试令人满意。 5.3 本试验方法的一些用户最感兴趣的是粘结接头的性能;一些人对粘合剂的性能最感兴趣。在后一种情况下,重要的是要注意,当测试的对照试样或测试的老化试样显示木材破坏时,粘合剂强度的真实方差(误差均方)可能会被掩盖。 5.4 程序冲突- 如果本试验方法的程序与详细的产品规范或制造商对特定材料的使用说明相冲突,则使用后者。
1.1 This test method describes how to estimate the relative resistance to deterioration of adhesive films and adhesive-bonded joints placed in a high-pressure oxygen environment. The instructions include both wood-to-wood and wood-to-metal joints as well as free film of adhesive. The effects of chemicals such as fire retardants, preservatives, or wood extractives, can be evaluated by using materials containing these chemicals for adherends. 1.2 This test method is primarily intended for elastomer-based construction adhesives, but is also applicable to other types of adhesives that may be susceptible to oxygen degradation. This accelerated test does not correlate exactly with the natural aging of the adhesive because of the varied conditions of natural aging and the absence of factors such as moisture and stress. The results of this accelerated test are only comparative and must be evaluated against the performance of bonded joints whose natural and accelerated aging characteristics are known. 1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 This test method is useful to the adhesive manufacturer in research and development or in manufacturing control. The results are also used for specification acceptance or as a guide in adhesive selection. 5.2 The provisions for testing bonded specimens as well as free films are made for two purposes. First, it is possible for an interaction to occur between oxygen and chemicals or degradation products that may affect the degradation of the bonded joints strength. Second, some increase in strength due to oxidative crosslinking may not be detrimental in a bonded assembly and in fact may be beneficial. Adhesives of this behavior are not satisfactorily tested by a film flexibility test. 5.3 Some users of this test method will be most interested in the performance of the bonded joint; some will be most interested in the performance of the adhesive. In the latter case, it is important to note that the true variance (error mean square) of the strength of the adhesive may be obscured when the tested control specimens or the tested aged specimens show wood failure. 5.4 Conflict of Procedure— If the procedures of this test method conflict with those of detailed product specifications or manufacturer's use instructions for a particular material, then use the latter.
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归口单位: D14.70
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