1.1 本试验方法包括测量经电晕处理的聚合物膜表面上水滴的接触角。 注1: 本标准与ISO相同 15989 1.2 以国际单位制表示的数值应视为标准。括号中给出的值仅供参考。 1.3 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和健康实践，并确定监管限制的适用性。 1.4 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 聚合物膜保留油墨、涂料、粘合剂等的能力主要取决于其表面的特性，可以通过几种表面处理技术之一来提高。已发现放电处理（例如电晕处理）可增加聚合物膜的润湿张力。处理越强，表面与不同极性界面的反应越活跃。因此，如果油墨、涂层或粘合剂包含极性功能，则可以将聚合物膜表面的接触角与其接受和保留油墨、涂层、粘合剂等的能力联系起来。接触角本身不是衡量油墨、涂层或粘合剂附着力的完全可接受的指标。 5.2 聚合物膜的润湿张力属于一组物理参数，不存在准确度标准。聚合物的润湿张力不能直接测量，因为固体在与表面能的反应中不会发生可测量的形状变化。已经提出了许多间接方法。 5. 不同的测试方法往往会在相同的样品上产生不同的结果。固体表面能的实际测定使用固体与试验液体的这种相互作用。 5.3 虽然聚合物薄膜的表面处理水平在行业中传统上是以达因/厘米（mN/m）来定义的，但这些值是从观察到的测试液体行为的主观解释中得出的。 5.4 以下水接触角值范围可作为确定具有初始低表面能的聚烯烃和许多其他聚合物膜的表面处理水平的指南: 边缘或无治疗 >90° 低处理 85至90° 中等处理 78至84° 高处理 71至77° 非常高的处理 <71° 5.4.1 必须通过对每个特定薄膜和处理的能力研究，确定测试对聚合物薄膜的规范验收、制造控制和最终用途的适用性。 5.5 几乎所有材料在点到点移动时的接触角都会发生变化。用电晕处理剂对薄膜进行不均匀处理也可能会增加结果的可变性。 因此，需要多次测量以反映处理和表面粗糙度的变化。

1.1 This test method covers measurement of the contact angle of water droplets on corona-treated polymer film surfaces. Note 1: This standard is identical to ISO 15989. 1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.3 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 and health practices and determine the applicability of regulatory limitations prior to use. 1.4 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 The ability of polymer films to retain inks, coatings, adhesives, etc. is primarily dependent on the character of their surfaces and can be improved by one of several surface-treating techniques. The electrical discharge treatment, such as corona treatment, has been found to increase the wetting tension of a polymer film. The stronger the treatment, the more actively the surface reacts with different polar interfaces. It is therefore possible to relate the contact angle of a polymer film surface to its ability to accept and retain inks, coatings, adhesives, etc., if the ink, coating, or adhesive contains the polar functionalities. Contact angle in itself is not a completely acceptable measure of ink, coating, or adhesive adhesion. 5.2 The wetting tension of a polymer film belongs to a group of physical parameters for which no standard of accuracy exists. The wetting tension of a polymer cannot be measured directly because solids do not change shape measurably in reaction to surface energy. Many indirect methods have been proposed. 5 Different test methods tend to produce different results on identical samples. Practical determination of a solid's surface energy uses this interaction of the solid with test liquids. 5.3 Although the level of surface treatment of polymer films has been traditionally defined in the industry in terms of dynes/cm (mN/m), these values are derived from a subjective interpretation of the observed test liquid behavior. 5.4 The following ranges of water contact angle values can be used as a guide for defining the level of surface treatment of polyolefins and many other polymer films with initial low surface energies: Marginal or no treatment >90° Low treatment 85 to 90° Medium treatment 78 to 84° High treatment 71 to 77° Very high treatment <71° 5.4.1 The suitability of the test for specification acceptance, manufacturing control, and end use of polymer films will have to be established through capability studies for each particular film and treatment. 5.5 Almost all materials have variations in contact angle as one moves from point to point. Nonuniform treatment of film with corona treaters may also add variability to the results. Therefore, multiple measurements are necessary to reflect variation in treatment and surface roughness.