1、Designation: D 7394 08Standard Practice forRheological Characterization of Architectural Coatingsusing Three Rotational Bench Viscometers1This standard is issued under the fixed designation D 7394; the number immediately following the designation indicates the year oforiginal adoption or, in the cas
2、e 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. Scope1.1 This practice covers a popular industry protocol for therheological characterization of wat
3、erborne architectural coat-ings 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 shearrate, and at high shear rate respectively as defined herein.General guidelines are provid
4、ed for predicting some coatingperformance properties from the viscosity measurementsmade. With appropriate correlations and subsequent modifica-tion of the performance guidelines, this practice has potentialfor characterization of other types of aqueous and non-aqueouscoatings.1.2 The values stated
5、in SI units are to be regarded asstandard.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulator
6、y limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D 562 Test Method for Consistency of Paints MeasuringKrebs Unit (KU) Viscosity Using a Stormer-Type Viscom-eterD 869 Test Method for Evaluating Degree of Settling ofPaintD 1005 Test Method for Measurement of Dry-Film Thick-ness of
7、 Organic Coatings Using MicrometersD 1200 Test Method for Viscosity by Ford Viscosity CupD 2196 Test Methods for Rheological Properties of Non-Newtonian Materials by Rotational (Brookfield type) Vis-cometerD 2805 Test Method for Hiding Power of Paints by Reflec-tometryD 4040 Test Method for Rheologi
8、cal Properties of PastePrinting and Vehicles by the Falling-Rod ViscometerD 4062 Test Method for Leveling of Paints by Draw-DownMethodD 4287 Test Method for High-Shear Viscosity Using aCone/Plate ViscometerD 4400 Test Method for Sag Resistance of Paints Using aMultinotch ApplicatorD 4414 Practice fo
9、r Measurement of Wet Film Thickness byNotch GagesD 4958 Test Method for Comparison of the Brush Drag ofLatex Paints3. Terminology3.1 Definitions:3.1.1 coating rheology, nthe viscosity profile obtained fora fluid coating over a range of shear rates.3.1.2 high-shear viscosity (HSV), nthe viscosity of
10、a fluidcoating at high shear rate (typically measured at 10,000 or12,000 sec-1), and for architectural coatings, it is often referredto as the “ICI” or “brush-drag” viscosity.3.1.3 leveling, nthe ability of a wet coating to flow out toa smooth dry film after application, thereby minimizing orelimina
11、ting coating surface irregularities that occur duringbrushing, rolling or spraying (see also Test Method D 4062).3.1.4 low-shear viscosity (LSV), nthe viscosity of a coat-ing fluid at low shear rate (typically in the range of 0.001 to1s-1), often referred to as the “leveling viscosity” or inverselya
12、s the “suspension viscosity.”3.1.5 mid-shear thickener effciency (MSTE), nthe weightof active thickener per unit volume of wet coating required togive the target MSV, commonly expressed as lb activethickener/100 gal wet coating (or in g/L units).3.1.6 mid-shear viscosity (MSV), nthe viscosity of aco
13、ating fluid at medium shear rate (typically in the range of 10to 1000 s-1), often referred to as the “consistency” or the“mixing viscosity.”1This practice is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings, Materials, and Applications and is the direct responsibility ofSubc
14、ommittee D01.24 on Physical Properties of Liquid Paints cone/plate-type viscom-eter; high-shear viscosity; low-shear viscosity; mid-shear vis-cosity; paints; rheology; Stormer viscometer; viscosityTABLE 1 LSV Guideline for Typical Architectural Latex PaintsLSV (Poise) Coating Performance2400 no leve
15、ling very high suspensionTABLE 2 HSV Guideline for Typical Architectural Latex PaintsHSV (Poise) Coating Performance2.5 excessive for brushing or rollingD7394084ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this sta
16、ndard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be revi
17、ewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsib
18、le technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).D7394085
