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ASTM D7394-2008 用立体台式旋转粘度计测定建筑涂料流变学性能的规程

ASTM D7394-2008 用立体台式旋转粘度计测定建筑涂料流变学性能的规程

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【英文标准名称】: Standard Practice for Rheological Characterization of Architectural Coatings using Three Rotational Bench Viscometers
【原文标准名称】: 用立体台式旋转粘度计测定建筑涂料流变学性能的规程
【标准号】: ASTM D7394-2008
【标准状态】: 现行
【国别】: 美国
【发布日期】: 2008
【实施或试行日期】:
【发布单位】: 美国材料与试验协会(US-ASTM)
【起草单位】: D01.24
【标准类型】: (Practice)
【标准水平】: ()
【中文主题词】:
【英文主题词】: Brookfield-type viscometer; cone/plate-type viscometer; high-shear viscosity; low-shear viscosity; mid-shear viscosity; paints; rheology; Stormer viscometer; viscosity
【摘要】: A significant feature of this practice is the ability to obtain a semblance of coating rheology over a broad range of shear rates with the same bench viscometers and test protocol that paint formulators and paint QC analysts routinely use. By using this procedure, an approximation of the shear rheology of a coating is possible without using a rheometer, and performance predictions can be made based on those measurements. Low-Shear Viscosity (LSV)8212;The determination of low-shear viscosity in this practice can be used to predict the relative x201C;in-canx201D; performance of coatings for their ability to suspend pigment or prevent syneresis, or both. The LSV can also predict relative performance for leveling and sag resistance after application by roll, brush or spray. Fig. 1 shows the predictive low-shear viscosity relationships for several coatings properties. 5.3 Mid-Shear Viscosity (MSV)8212;The determination of MSV (coating consistency) in this practice is often the first viscosity obtained. This viscosity reflects the coatings resistance to flow on mixing, pouring, pumping, or hand stirring. Architectural coatings nearly always have a target specification for mid-shear viscosity, which is usually obtained by adjusting the level of thickener in the coating. Consequently, mid-shear viscosity is ideally a constant for a given series of coatings being tested to provide meaningful comparisons of low-shear and high-shear viscosity. With viscosities at the same KU value, MSV can also be used to obtain the relative Mid-Shear Thickener Efficiency (MSTE) of different thickeners in the same coating expressed as lb thickener/100 gal wet coating or g thickener/L wet coating. 5.4 High-Shear Viscosity (HSV)8212;High-shear viscosity in this practice is a measure of the coatings resistance to flow on application by brush or roller, which is often referred to as brush-drag or rolling resistance respectively. This viscosity relates to the coatings ability to provide one-coat hiding, its ease of application (brushing or rolling resistance), and its spread rate. Fig. 2 shows high-shear viscosity relationship predictions for relative coating performance. FIG. 1 Low Shear Viscosity (LSV) FIG. 2 High Shear Viscosity (HSV)1.1 This practice covers a popular industry protocol for the rheological characterization of waterborne architectural coatings using three commonly used rotational bench viscometers. Each viscometer operates in a different shear rate regime for determination of coating viscosity at low shear rate, mid shear rate, and at high shear rate respectively as defined herein. General guidelines are provided for predicting some coating performance properties from the viscosity measurements made. With appropriate correlations and subsequent modification of the performance guidelines, this practice has potential for characterization of other types of aqueous and non-aqueous coatings. 1.2 The values stated in SI units are to be regarded as standard. 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.
【中国标准分类号】: Q18
【国际标准分类号】: 17_06
【页数】: 5P.;A4
【正文语种】: 英语

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