ASTM D4242-2007(2017) Standard Test Method for Inclined Plate Flow for Thermosetting Coating Powders《热固性涂层粉末斜板流动的标准试验方法》.pdf
《ASTM D4242-2007(2017) Standard Test Method for Inclined Plate Flow for Thermosetting Coating Powders《热固性涂层粉末斜板流动的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D4242-2007(2017) Standard Test Method for Inclined Plate Flow for Thermosetting Coating Powders《热固性涂层粉末斜板流动的标准试验方法》.pdf(3页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D4242 07 (Reapproved 2017)Standard Test Method forInclined Plate Flow for Thermosetting Coating Powders1This standard is issued under the fixed designation D4242; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the yea
2、r 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 test method specifies a method for determining theflow characteristics of a fused thermosetting coating powd
3、erdown a plane inclined at a set angle to the horizontal. The testgives an indication of the degree of melt flow that may occurduring the curing of the coating powder. This characteristiccontributes to the coherence of the coating, to its surfaceappearance and to the degree of coverage over sharp ed
4、ges (seeTest Method D2967), however, it should not be used as the solefactor for judgment. The test acts as a useful method forchecking for batch to batch variation in the behavior of a givencoating powder. Correlation between the results from coatingpowders of differing composition is not to be exp
5、ected. Thismethod is unlikely to yield meaningful results with coatingpowders which have gel times of less than one minute at thetest temperature (see Test Method D4217). Oven drafts, angleof inclination and pellet variations significantly affect resultsmaking inter-lab reproducibility somewhat diff
6、icult to corre-late.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 of this stand
7、ard to establish appro-priate safety and health practices and to determine theapplicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for
8、 theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2D792 Test Methods for Density and Specific Gravity (Rela-tive Density) of Plastics by DisplacementD2967
9、 Test Method for Corner Coverage of Powder Coat-ingsD4217 Test Method for Gel Time of Thermosetting CoatingPowderD5965 Test Methods for Specific Gravity of Coating Pow-ders2.2 Other Documents:ISO 8130-2 Coating powdersPart 2: Determination ofdensity by gas comparison pyknometer3ISO 8130-3 Coating po
10、wdersPart 3: Determination ofdensity by liquid displacement pyknometer3ISO 813011:1997 Coating powdersPart 11: Inclined-plane flow test33. Terminology3.1 Definitions:3.1.1 coating powder, nfinely divided particles of resin,either thermoplastic or thermosetting, generally incorporatingpigments, fille
11、rs, and additives and remaining finely dividedduring storage under suitable conditions, which after fusingand possibly curing, give a continuous film.3.1.2 powder coating, ncoatings which are protective ordecorative, or both, formed by the application of a coatingpowder to a substrate and fused in a
12、 continuous film by theapplication of heat or radiant energy.3.1.3 gel time of a coating powder, nthe interval requiredat a given temperature for a coating powder to be transformedfrom a dry solid to a gel-like state.1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Relat
13、ed Coatings, Materials, and Applications and is the direct responsibility ofSubcommittee D01.51 on Powder Coatings.Current edition approved June 1, 2017. Published June 2017. Originallyapproved in 1983. Last previous edition approved in 2013 as D4242 07 (2013).DOI: 10.1520/D4242-07R17.2For reference
14、d 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.3Available from International Organization for Standardization (ISO), 1 rue
15、 deVaremb, Case postale 56, CH-1211, Geneva 20, Switzerland, http:/www.iso.ch.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standar
16、dization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.13.1.4 cure time of a coating powder, nthe time required fora thermosetting coating powder t
17、o sufficiently chemicallycrosslink at a given temperature to provide the required coatingproperties.3.1.5 thermosetting, adjdescribing a material that, whenheated per a minimum recommended cure condition, under-goes a chemical reaction and a permanent change to a moredurable state capable of specifi
18、c properties as designed forsubstrate protection or decoration, or both.4. Summary of Test Method4.1 The thermosetting coating powder is pressed into apellet of standard size which is allowed to melt and flow downa heated inclined plate. The extent of flow is measured.5. Significance and Use5.1 This
19、 test method is useful for selecting coating powdersof similar characteristics of melt flow under minimal shear. Itis not recommended as an absolute measurement, but rather asa comparative measurement of samples on the same panelmeasured at the same time.6. Apparatus6.1 Fan-assisted Air Circulation
20、Oven, capable of maintain-ing the desired temperature to 62C (64F).6.2 Glass Plates, of suitable dimensions to undertake thetest. As an alternative, metal plates may be used. However,these will need to be closely defined with respect to theircomposition and surface finish. The plates shall be suffic
21、ientlyrigid so as not to flex during the text. The details of the glassor metal plates shall be included in the test report.6.3 Plate Assembly, of suitable metal and design that fitsinside the oven. The assembly shall be capable of carrying oneor more of the plates (6.2) in a horizontal position and
22、 at anangle of 65 6 1 to the horizontal when moved by a leverprojecting through the side of the oven. Alternatively a fixedplate holder, of suitable metal and design, capable of holdingone or more of the plates at 65 6 1 to the horizontal may beused. If otherwise agreed to, test angles other than 65
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