ASTM D7394-2018 red 1250 Standard Practice for Rheological Characterization of Architectural Coatings using Three Rotational Bench Viscometers.pdf

1、Designation: D7394 17D7394 18Standard 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*Scope1.1 This practice coversdescribes a popular industry protocol for the rheological c

3、haracterization of waterborne architecturalcoatings using 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. Genera

4、lguidelines are 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

5、.1.2 The values 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 safe

6、ty, health, and healthenvironmental practices and determine theapplicability of regulatory limitations prior to use.1.4 This international standard was developed in accordance with internationally recognized principles on standardizationestablished in the Decision on Principles for the Development o

7、f International Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2D562 Test Method for Consistency of Paints Measuring Krebs Unit (KU) Viscosity Using a Stormer-Type ViscometerD869 Test M

8、ethod for Evaluating Degree of Settling of PaintD1005 Test Method 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 Tes

9、t Method for Hiding Power of Paints by ReflectometryD4040 Test 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

10、Method for Sag Resistance of Paints Using a Multinotch ApplicatorD4414 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 coat

11、ing over a range of shear rates.3.1.2 high-shear viscosity (HSV), nthe viscosity of a fluid coating at high shear rate (typically measured at 10,000 s-1 or12,000 s-1), and for architectural coatings, it is often referred to as the “brush-drag” viscosity.1 This practice is under the jurisdiction of A

12、STM Committee D01 on Paint and Related Coatings, Materials, and Applications and is the direct responsibility ofSubcommittee D01.24 on Physical Properties of Liquid Paints high-shear viscosity; Krebs unit viscometer; low-shear viscosity; mid-shear viscosity; paints;rheology; viscositySUMMARY OF CHAN

13、GESCommittee D01 has identified the location of selected changes to this standard since the last issue (D7394-13)that may impact the use of this standard. (Approved February 1, 2017.)(1) Changed the abbreviation “rpm” throughout the standard to the SI unit of “r/min.”TABLE 2 HSV Guideline for Typica

14、l Architectural Latex PaintsHSV (Poise) Coating PerformanceHSV (Poise) Coating Performance2.5 excessive for brushing or rollingD7394 185(2) In sections 4.1, 7.2, 8.1.1, 8.3.1, 8.5.1, 9.1.2, and 10.1 changed from the trademarked brand name “Brookfield” to the technicalequivalent “cylindrical- or disc

15、-type spindle.”ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of s

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