ASTM D6736-2001 Standard Test Method for Burnish Resistance of Latex Paints《试验方法》.pdf
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1、Designation: D 6736 01Standard Test Method forBurnish Resistance of Latex Paints1This standard is issued under the fixed designation D 6736; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in par
2、entheses 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 a procedure for measuring theresistance of latex paints to burnishing under dry conditions.1.2 This standard does not purpo
3、rt 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 Standards:D 523
4、 Test Method for Specular Gloss2D 2486 Test Methods for Scrub Resistance of Wall Paints3D 3924 Specification for Standard Environment for Condi-tioning and Testing Paint, Varnish, Lacquer, and RelatedMaterials23. Terminology3.1 Definition:3.1.1 burnish resistancethe ability of a coating to resist an
5、increase in its gloss (sheen) value after polishing or rubbing.4. Summary of Test Method4.1 Test paints are drawn down lengthwise on plastic panelsusing a 0.18-mm (7.0-mil) applicator and allowed to air-dry forone week. Gloss readings are taken at three equally spacedpoints, lengthwise along the cen
6、ter of the panel. The panel isthen rubbed for 20 cycles on a scrub machine, after which glossreadings are again taken along the same path abraded by thescrub machine. The initial values are averaged and the finalvalues are averaged. The difference between the initial andfinal gloss readings, divided
7、 by the initial reading times 100 isa quantitative indication of the paints resistance to burnishing.Higher percentage increases denote poorer resistance andvice-versa.5. Significance and Use5.1 Interior flat paints may become burnished in areas whereclothing or upholstered furniture rub against a w
8、all. Thisrubbing may cause a smoother, glossier surface at the contactedarea, depending on the level or type of pigments in the paintand binder hardness. This method permits a more quantitativeestimate of burnish resistance than those using manual rubbingtechniques.6. Apparatus6.1 Constant temperatu
9、re/humidity room 23 6 2C (73.5 63.5F); 50 6 5 % relative humidity (standard conditions,Specification D 3924).6.2 Washability Machine (Scrub Machine), described in TestMethods D 2486.6.2.1 Accessory Apparatus:6.2.1.1 Sandpaper Attachment, total weight 454 g.6.2.1.2 Glass Plate, measured to fit.6.2.1.
10、3 Gasket Frame and Clamps.6.3 Large Vacuum Plate.6.4 Film Caster, having a 0.18-mm (7.0-mil) clearance.6.5 Glossmeter(s), capable of measuring 60 and 85 glossin accordance with Test Method D 523.7. Materials7.1 Plastic Scrub Panels, 43.5 mm 3 16.5 mm (17 in. 3 6.5in.), white or black.7.2 Cheesecloth
11、, 4-ply, medium weave.48. Procedure8.1 Application and Evaluation of Test Paints:8.1.1 Attach a plastic panel to the vacuum plate and drawdown the test paint uniformly lengthwise, using the 0.18-mm(7.0-mil) side of the applicator.8.1.2 Condition the panels for one week in the constanttemperature / h
12、umidity room or under other conditions agreedupon between the buyer and seller.8.1.3 Take three equally spaced gloss readings (Test MethodD 523) along the center length of the panel, making sure theareas of the readings are within the travel path of the scrubmachine attachment. The resulting average
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