1、Designation: D7394 13D7394 17Standard Practice forRheological Characterization of Architectural Coatingsusing Three Rotational Bench Viscometers1This standard is issued under the fixed designation D7394; the number immediately following the designation indicates the year oforiginal adoption or, in t
2、he case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This practice covers a popular industry protocol for the rheological characterizatio
3、n of waterborne architectural coatingsusing three commonly used rotational bench viscometers. Each viscometer operates in a different shear rate regime fordetermination of coating viscosity at low shear rate, mid shear rate, and at high shear rate respectively as defined herein. Generalguidelines ar
4、e provided for predicting some coating performance properties from the viscosity measurements made. Withappropriate correlations and subsequent modification of the performance guidelines, this practice has potential for characterizationof other types of aqueous and non-aqueous coatings.1.2 The value
5、s in common viscosity units (Krebs Units, KU and Poise, P) 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 responsibilityof the user of this standard to establish appropriate safety and health practic
6、es and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D562 Test Method for Consistency of Paints Measuring Krebs Unit (KU) Viscosity Using a Stormer-Type ViscometerD869 Test Method for Evaluating Degree of Settling of PaintD1005 Test Meth
7、od for Measurement of Dry-Film Thickness of Organic Coatings Using MicrometersD1200 Test Method for Viscosity by Ford Viscosity CupD2196 Test Methods for Rheological Properties of Non-Newtonian Materials by Rotational ViscometerD2805 Test Method for Hiding Power of Paints by ReflectometryD4040 Test
8、Method for Rheological Properties of Paste Printing and Vehicles by the Falling-Rod ViscometerD4062 Test Method for Leveling of Paints by Draw-Down MethodD4287 Test Method for High-Shear Viscosity Using a Cone/Plate ViscometerD4400 Test Method for Sag Resistance of Paints Using a Multinotch Applicat
9、orD4414 Practice for Measurement of Wet Film Thickness by Notch GagesD4958 Test Method for Comparison of the Brush Drag of Latex Paints3. Terminology3.1 Definitions:3.1.1 coating rheology, nthe viscosity profile obtained for a fluid coating over a range of shear rates.3.1.2 high-shear viscosity (HSV
10、), nthe viscosity of a fluid coating at high shear rate (typically measured at 10,000 or 12,000secs-1), and for architectural coatings, it is often referred to as the “ICI” or “brush-drag” viscosity.3.1.3 leveling, nthe ability of a wet coating to flow out to a smooth dry film after application, the
11、reby minimizing oreliminating coating surface irregularities that occur during brushing, rolling or spraying (see also Test Method D4062).1 This practice is under the jurisdiction of ASTM Committee D01 on Paint and Related Coatings, Materials, and Applications and is the direct responsibility ofSubc
12、ommittee D01.24 on Physical Properties of Liquid Paints and cone/plate-type viscometer; high-shear viscosity; Krebs unit viscometer; low-shear viscosity;mid-shear viscosity; paints; rheology; Stormer viscometer; viscositySUMMARY OF CHANGESCommittee D01 has identified the location of selected changes
13、 to this standard since the last issue(D7394-08)-13) that may impact the use of this standard. (Approved JulyFebruary 1, 2013.)2017.)(1) The units notation was changed from SI (which was incorrect) to common viscosity units (Krebs Units, KU, and Poise,P).Changed the abbreviation “rpm” throughout the
14、 standard to the SI unit of “r/min.”TABLE 2 HSV Guideline for Typical Architectural Latex PaintsHSV (Poise) Coating Performance2.5 excessive for brushing or rollingD7394 175(2) A few typos were corrected and a few words changed.In sections 4.1, 7.2, 8.1.1, 8.3.1, 8.5.1, 9.1.2, and 10.1 changed from
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