1、Designation:D233701(Reapproved 2014)Standard Test Method forFreeze-Thaw Stability of Multicolor Lacquers1This standard is issued under the fixed designation D2337;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 method covers the determination of the extentto which multicolor lacquers resist coagulation and coales-cence when subjecte
3、d to freezing and subsequent thawing.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.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
4、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:2D562 Test Method for Consistency of Paints MeasuringKrebs Unit(KU)Viscosity Using a Stormer-Type Viscom-eter3.Summa
5、ry of Test Method3.1 Specimens of multicolor lacquers are placed in a cham-ber maintained at a temperature between 23 and 26C(10and 15F)and allowed to remain 24 h.The specimens areremoved from the chamber and allowed to remain at roomtemperature for 24 h to reach thermal equilibrium.After thespecime
6、ns are mixed and the viscosity adjusted,they are thensprayed and allowed to dry before comparing with the controlstandard sprayed from the original specimen.4.Significance and Use4.1 Waterborne coatings,when subjected to cycles of freez-ing and thawing,can undergo detrimental changes in applica-tion
7、 and performance characteristics.This test method evalu-ates the ability of multicolor lacquers to resist these changes.5.Apparatus and Materials5.1 Cabinet,Room,or Enclosed Space,large enough tocontain the specimens to be tested and allowing at least 25 mm(1 in.)of air space between the sides of ad
8、jacent cans.It shouldbe capable of being maintained at a temperature between 23and 26C(10 and 15F).5.2 Stormer Viscometer,with paddle-type rotor.5.3 Spray Gun,pressure-feed internal-mix type,tip 0.086 in.(2 mm)in diameter with wide-spray nozzle.5.4 White Paper Stock,minimum size 200 by 280 mm(8 by11
9、 in.).6.Preparation of Samples6.1 For all gloss and semigloss multicolor lacquers,prepareten 1-L(1-qt)specimens and for flat multicolor lacquers four1-qt specimens for testing.Mix the sample from which thespecimens are filled well by boxing so that it is of a uniformconsistency and appearance.After
10、recording the consistencyreading as determined with a Stormer viscometer(in accor-dance with Test Method D562 fill all samples in bakedvarnish-lined containers and apply the lids promptly to preventevaporation loss).7.Preparation of Control Standard7.1 Prepare a control standard by spraying from one
11、 of the1-L(1-qt)specimens of each product to be tested.Use a coatedwhite paper stock and spray on a sheet at least 200 by 280 mm(8 by 11 in.)in size.Adjust the fluid and atomizing pressuresto give a spreading rate of 3.7 to 4.9 m2/L(150 to 200 ft2/gal)for complete covering and 4.9 to 7.35 m2/L(200 t
12、o 300 ft2/gal)for scatter coat application.8.Exposure of Samples to Test Conditions8.1 Place nine specimens of all gloss and semigloss multi-color lacquers and three specimens of all flat multicolorlacquers under test in the chamber that is maintained between23 and 26C(10 and 15F).Place the specimen
13、s on racksin such a manner that they do not touch the walls or bottom ofthe chamber and so that there is at least 25 mm(1 in.)of airspace between adjacent specimens.On each cycle allow all1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and App
14、lications and is the direct responsibility ofSubcommittee D01.24 on Physical Properties of Liquid Paints and Paint Materials.Current edition approved Dec.1,2014.Published December 2014.Originallyapproved in 1965.Last previous edition approved in 2010 as D2337 01(2010).DOI:10.1520/D2337-01R14.2For re
15、ferenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Consh
16、ohocken,PA 19428-2959.United States1 specimens to remain in the chamber for 24 h before removal.Remove from the chamber all specimens of each multicolorlacquer and let them come to thermal equilibrium by allowingthem to remain at room temperature(25C(77F)for 24 h.Mix these specimens to a uniform consistency by boxing.Runa minimum of three specimens and all specimens shall pass thetest for multicolor to be acceptable.9.Examination of Samples and Spray After Test9.1 Check the consistency of all sp
