ASTM D4062-2011(2016) Standard Test Method for Leveling of Paints by Draw-Down Method《使用降落法进行涂料流平的标准试验方法》.pdf

1、Designation: D4062 11 (Reapproved 2016)Standard Test Method forLeveling of Paints by Draw-Down Method1This standard is issued under the fixed designation D4062; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revis

2、ion. 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 test method2covers the laboratory determination ofthe relative leveling of water and solvent-reducible architec-tural paint

3、s in white and light tints by comparing the ridgesproduced in a draw-down film to a series of plastic levelingstandards.1.2 Unpigmented, texture, and deep-tint coatings cannot bereadily evaluated with the shadowing produced by obliquelighting employed in this test method. Such coatings may berated b

4、y comparing them with the plastic standards at variousangles of reflection. For this purpose ordinary room lighting issatisfactory.1.3 Since other factors may influence the tendency of liquidpaints to sag, this test method is not intended to measuresagging.1.4 The values stated in SI units are to be

5、 regarded as thestandard. The values given in parentheses are for informationonly.1.5 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 d

6、etermine the applica-bility of regulatory limitations prior to use.2. Terminology2.1 Definitions of Terms Specific to This Standard:2.1.1 leveling, nof a paint, a measure of its ability to flowout after application so as to obliterate any surface irregulari-ties such as brush marks, orange peel, pea

7、ks, or craters thathave been produced by the mechanical process of application.3. Summary of Test Method3.1 The material to be tested is presheared and then appliedto a sealed chart by means of a special leveling test bladedesigned to lay down a film with parallel ridges simulatingbrush marks. After

8、 allowing the completed draw-down to dryin a horizontal position, leveling of the test paint is rated byviewing the draw-down under a strong, oblique light sourceand comparing the contrast of lightness and shadow caused bythe paint ridges to that of a series of plastic leveling standardsunder the sa

9、me lighting conditions.4. Significance and Use4.1 Leveling can affect the hiding and appearance ofapplied architectural coatings, the presence of brushmarks andsurface irregularities being more conspicuous with gloss andsemi-gloss finishes than with flat finishes. Instrumental evalu-ations of leveli

10、ng by this test method have been shown tocorrelate with those made by brush application.5. Apparatus5.1 Leveling Test Blade3, 4A grooved draw-down bladedesigned to lay down a wet film with parallel ridges (see Fig.1).5.2 Draw-Down Plate,5with two parallel, smooth-facedstraightedges to guide the blad

11、e during film application andensure that the ridges are straight.5.3 Syringe and NeedleA 10-mL LuerLok syringe and38-mm (112-in.) No. 15 gage needle for placing a fixed amountof the paint in front of the blade while simultaneouslypreshearing it (as during brushing) prior to drawing-down.Either glass

12、 or disposable plastic syringes may be used withwater-reducible paints. Glass syringes only may be used withsolvent-reducible paints due to swelling of disposable syringesby the solvent.1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings, Materials, and App

13、lications and is the direct responsibility ofSubcommittee D01.42 on Architectural Coatings.Current edition approved April 1, 2016. Published April 2016. Originallyapproved in 1981. Last previous edition approved in 2011 as D4062 11. DOI:10.1520/D4062-11R16.2This test method was essentially developed

14、 by the Leneta Company as outlinedin Leneta Catalog No. 3, pp. 267 (1976).3The Leneta Company, 15 Whitney Road, Mahwah, NJ 07430, is the solemanufacturer of the leveling test blade. This blade, the drawn-down plate, chart,light source, and levelness standards are all manufactured solely by the Lenet

15、a Co.,and can be obtained from Leneta and most scientific supply houses.4The Leneta Leveling Test Blade used in this test method is a modification of thethreaded draw-down bar described in an article by Dodge, J. S. “QuantitativeMeasures of Leveling,” Journal of Paint Technology, Vol 44, No. 564, Ja

16、nuary1972.5A suitable draw-down plate may be constructed from the description given in5.2 of this test method.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States15.4 Test Chart, plain white (for white or light tints) orpredominantly black

17、 chart (for deep tints) coated with asuitable varnish or lacquer to render the test surface imperviousto the volatile portion of the paint.5.5 Light Source,6oblique, to illuminate the test draw-downand leveling standards (see Fig. 2).5.6 Levelness Standards7Three-dimensional full-scalereplicas of dr

18、aw-downs made with the leveling test blade andnine paints exhibiting very poor to very good leveling, forcomparison with the test draw-down.6A suitable light source may be constructed from the description given in 5.5and Fig. 2 of this test method.7Leneta Draw-Down Levelness Standards, a series of n

19、ine 3 by 5 in. (75 by 125mm) plastic full-scale replicas of draw-downs of paints having very poor to verygood leveling were used in this test method. These standards can be obtained fromLeneta and most scientific supply houses.Dimensions: mmin. (ap-prox.)Dimensions: mmin. (ap-prox.)ALength 165 6.5 E

20、Major doctoring edge 1.25 0.05BDiameter 22 0.87 FMinor clearance 0.10 0.004CSupporting edge 25 1.0 GClearance step 0.20 0.008DMinor doctoring edge 1.25 0.05 HMajor clearance 0.30 0.012NOTE 1This is actually a cylindrical rod, the term “blade” being employed as a conventional reference to film applic

21、ators. Auxiliary plastic sidearms not shown. See Fig. 1 ( b)and1(c).FIG. 1 (a) Leneta Leveling Test Draw-Down BladeNOTE 1Plastic sidearms are for guidance to assure rectilinearity ofblade movements.NOTE 1Illustration of use of draw-down plate and catch papers. Notethat sidearms are attached to the t

22、est blade and parallel straightedge guideson draw-down plate.FIG. 1 (b) Photograph of the Leneta Leveling Test Draw-Down Blade FIG. 1 (c) Application With the Leneta Leveling Test Draw-Down BladeFIG. 1 Test Draw-Down BladeD4062 11 (2016)25.7 Catch Papers, disposable, any type for catching excesspain

23、t is adequate.6. Preparation of Sample6.1 Adjust the temperature of the paint to 23 6 2C (73.5 63.5F) or to a temperature agreed upon between buyer andseller.6.2 Thoroughly mix the paint by hand with a spatula to asmooth, uniform composition and consistency to ensure thatthe specimen to be taken for

24、 testing is representative.7. Procedure7.1 Affix the test chart to the draw-down plate. Position theleveling blade at the far end of the chart, between the parallelstraightedges, with the longer arm of the blade adjacent to theleft edge and pointing toward the operator.7.2 Place a catch paper just b

25、elow but in contact with thechart so that it is slightly to the right of the longer arm of theblade.7.3 With the needle not attached, take up 8 to 10 mL of thematerial under test into the syringe (Note 1). Wipe off thesyringe orifice and attach the No. 15 gage needle. Eject within3 to 5 s the entire

26、 amount in front of the blade, forming apuddle. Immediately lay the syringe down, grasp the bladearms with both hands, and draw the leveling blade rapidly butsmoothly over the test paint at a rate of about 0.6 m (2 ft) pers, keeping the long arm on the left parallel to the surface duringthe draw-dow

27、n.NOTE 1Filling the syringe and cleaning the orifice are greatlyfacilitated by temporarily attaching to the orifice a 2-in. (50-mm) length ofclear vinyl tubing with inside diameter of 3.2 mm (18 in.) and outsidediameter of 5 mm (316 in.), which is removed prior to attaching the needle.7.4 Allow the

28、completed draw-down to dry overnight in ahorizontal position, preferably at 23 6 2C (73.5 6 3.5F) and50 6 5 % relative humidity, or under other conditions agreedupon between the buyer and the seller.7.5 Place the dry draw-down, with its ridges perpendicularto the direction of the light, in front of

29、the oblique light asshown in Fig. 2. Place two leveling standards similarly orientedon either side of the test draw-down and view the centerportion of the draw-down and the standards from above (that isat a 90 angle to the surface), or as close to 90 as possible ifin a lighted room (see Fig. 2). The

30、n successively interchangestandards until one is found having the same distinctness oflightness and shadow as the test draw-down. Leveling poorerthan Standard No. 1 is designated as 0 or very poor leveling.Leveling better than Standard No. 9 is designated as 10 whichrepresents perfect leveling or no

31、 perceptible ridges. Estimateand record the number of the leveling standard that corre-sponds to the leveling of the test draw-down.8. Report8.1 Report the leveling of the test paint on the scale of 0 to10 as determined by comparison with the numbered levelingstandards.9. Precision9.1 On the basis o

32、f a study in which seven operators, eachusing a different blade, rated twelve different paints,8the8Forms 7B and WB from Leneta Company were used in the development of thisprecision statement.FIG. 2 Oblique Light Source (The Level Luminator) (Side View)D4062 11 (2016)3between-laboratories standard d

33、eviation was found to be 1.5units on the 0 to 10 scale. Based on this standard deviation, thefollowing criteria should be used for judging the acceptabilityof results at the 95 % confidence level:9.1.1 ReproducibilityTwo single results obtained by op-erators in different laboratories, should be cons

34、idered suspect ifthey differ by more than 1.5 scale units.10. Keywords10.1 leveling of paints; rheological properties, flowASTM 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 expr

35、essly 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 reviewed every five years andif not revise

36、d, 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 theresponsible technical committee, which you may

37、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 State

38、s. 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). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 11 (2016)4