ASTM D2064-1991(2008) Standard Test Method for Print Resistance of Architectural Paints《建筑涂料抗污染性的标准试验方法》.pdf

1、Designation: D 2064 91 (Reapproved 2008)Standard Test Method forPrint Resistance of Architectural Paints1This standard is issued under the fixed designation D 2064; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last r

2、evision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers an accelerated procedure forevaluating the print resistance of architectural paints. It differsfrom

3、 print resistance Test Method D 2091 in that the latter isconcerned with lacquer finishes under packaging, shipping, andwarehousing conditions, whereas this test method is concernedwith decorative coatings undergoing random on-site pressurecontact.NOTE 1Printing should not be confused with blocking,

4、 which ismeasured in Test Method D 4946. The former relates to the indentation ofa surface, and the latter, the sticking together of two surfaces.1.2 The values stated in inch-pound units are to be regardedas the standard. The values given in parentheses are forinformation only.1.3 This standard doe

5、s 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 regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Stan

6、dards:2D 2091 Test Method for Print Resistance of LacquersD 4946 Test Method for Blocking Resistance of Architec-tural Paints3. Terminology3.1 Definitions:3.1.1 print resistance, nthe ability of a paint film to resistforming a permanent impression in a semihardened film as aresult of a pressure from

7、 an object placed on it.3.2 For additional definitions of terms, refer to Paint/Coatings Dictionary.34. Summary of Test Method4.1 A piece of cheesecloth is placed on the painted surfaceand topped with a No. 8 rubber stopper (position smallerdiameter of stopper on the cheesecloth) and a 500-g weight

8、tocreate a pressure of about 0.9 psi (6.2 kPa). This assembly isplaced in a 140F (60C), or other agreed upon temperature,oven for 1 h. When cooled, the resulting paint surfaces arerated on the numerical scale of 0 to 10, which corresponds toa subjective rating of an impression resulting from their b

9、eingin contact with the cheesecloth.5. Significance and Use5.1 The ability of a coating to resist printing is importantbecause its appearance is adversely affected if the smoothnessof the coating film is altered by contact with another surface,particularly one with a texture. Interior paint systems,

10、 particu-larly gloss and semigloss on window sills and other horizontalsurfaces, often have objects such as flower pots placed on themthat may tend to leave a permanent impression. This tendencyfor a paint film to “print” is a function of the hardness of thecoating, the pressure, temperature, humidi

11、ty, and the durationof time that the object is in contact with the painted surface.6. Apparatus6.1 Conditioning Room, at 65 to 85F (18 to 29.5C) and 40to 60 % relative humidity.6.2 Glass Slides, approximately 3 by 6 in. (75 by 150 mm).6.3 Drawdown Applicator, 3-in. (75-mm) wide with aclearance of 6

12、mils (150 m).6.4 Oven, maintained at 140 6 3.5F (60 6 2C) or, otheragreed upon temperature.6.5 Rubber Stoppers, No. 8 (40-mm top diameter and32-mm bottom diameter).6.6 Cheesecloth, medium weave, 24/20, bleached cotton.6.7 Scissors.6.8 Weight, 500-g.7. Procedure7.1 Cast the paints being tested on gla

13、ss slides using adrawdown applicator with a clearance of 6 mils (150 m).Allow the coated glass slides to dry in the conditioned room for7 days.1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings, Materials, and Applications and is the direct responsibility

14、ofSubcommittee D01.42 on Architectural Coatings.Current edition approved Feb. 1, 2008. Published March 2008. Originallyapproved in 1991. Last previous edition approved in 2003 as D 2064 91 (2003).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at

15、 serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Paint/Coatings Dictionary, available from the Federation of Societies forCoatings Technology, Blue Bell, PA, 1978.1Copyright ASTM International, 100 Barr Harbor Dri

16、ve, PO Box C700, West Conshohocken, PA 19428-2959, United States.7.2 Cut out approximately 112 by 112-in. (40 by 40-mm)pieces of cheesecloth, one piece for each slide. Use cheesecloththat is usually supplied with 4 intact layers. Do not separate thelayers.7.3 Place the test slides on a horizontal tr

17、ay, painted faceupward, then place one piece of cheesecloth over each slideand top with the small diameter face of a No. 8 stopper and a500-g weight, one weight and stopper for each specimen.(Weights and stoppers should be equilibrated in the oven priorto running the test.) It is recommended that co

18、ntrol paints ofknown satisfactory and unsatisfactory performance be used ineach test run and that the tests be run in duplicate.7.4 Place the entire assembly in the oven and remove it afterexactly 1 h. Immediately lift off the weights and stopperswithout disturbing the cheesecloth and allow to cool.

19、7.5 After approximately12 h, remove the cheesecloths andcarefully examine the appearance of the films underneath. Notethe depth and amount of cheesecloth pattern left in the paintfilm. If necessary examine the panel, for better perception ofindentations, by viewing it at a low (grazing) angle ofillu

20、mination.8. Interpretation of Results8.1 Rate print resistance is rated on a numerical scale of 0 to10 corresponding to a subjective rating of the degree to whichthe paint film has been imprinted. Record the numerical valuefor print resistance in accordance with the following ASTMstyle rating or sco

21、ring system:NumericalRatingQualitative Characterization(Resistance to Printing)Quantitative Description(Amount of Printing)10 perfect none8 very good very slight6 good slight4 fair moderate2 poor considerable0 very poor very great9. Report9.1 Report the print resistance rating determined in accor-da

22、nce with 8.1. Specify temperature used.10. Precision10.1 Data are unavailable for a conventional intra- andinterlaboratory precision statement. However, based on actuallaboratory experience, with experienced operators, the repeat-ability is estimated to be plus or minus one unit. The employ-ment of

23、common control paints with mutually agreed ratingsshould make it possible for interlaboratory agreement (repro-ducibility) to approach intralaboratory agreement (repeatabil-ity). Although numerical ratings may differ with differentoperators or at different times, ranking should be about thesame. As

24、in many tests the precision improves with practice.11. Keywords11.1 print resistanceASTM 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

25、 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 revised, either reapproved or withdrawn. Your

26、 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 attend. If you feel that your comments

27、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).D 2064 91 (2008)2