1、Designation: D7588 11Standard Guide forFT-IR Fingerprinting of a Non-Aqueous Liquid Paint asSupplied in the Manufacturers Container1This standard is issued under the fixed designation D7588; the number immediately following the designation indicates the year oforiginal adoption or, in the case of re
2、vision, the year 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 guide covers the FT-IR fingerprinting of a liquidpaint as supplied in the container without t
3、he need to separatecomponents. Spectra collected using this technique have beenfound useful for paint manufacturers quality control, troubleshooting and to verify that the paint being used is the same asthe paint sample tested. This technique has been found usefulfor both single and multi-component
4、coatings, the latter ofwhich, where each component is analyzed separately (forexample, amine cured epoxies and polyol/isocyanate ure-thanes).1.2 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.3 This standard does not purport
5、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 requirements prior to use.2. Referenced Documents2.1 ASTM Standards:2D2621
6、Test Method for Infrared Identification of VehicleSolids From Solvent-Reducible PaintsE131 Terminology Relating to Molecular SpectroscopyE168 Practices for General Techniques of Infrared Quanti-tative AnalysisE204 Practices for Identification of Material by InfraredAbsorption Spectroscopy, Using the
7、 ASTM Coded Bandand Chemical Classification Index3. Terminology3.1 Definitions:3.2 For definitions of terms and symbols, refer to terminol-ogy in Terminology E131.4. Summary of Guide4.1 Infrared spectra are collected using an FT-IR spectro-photometer fitted with an ATR crystal, multi or single bounc
8、e.Samples are taken directly from the paint container as suppliedby the manufacturer.5. Significance and Use5.1 The ability to collect an infrared spectrum of a liquidpaint as supplied in the container from the manufacturer is ofsignificant importance when performing qualification testing.Historical
9、ly, fingerprinting a material for such purpose in-volved separating the components of the paint and collectingan infrared spectrum of one or more of these components(vehicle, pigments, solvent, etc.) with Test Method D2621being used for the identification of the vehicle. This unfortu-nately provides
10、 information only on the portion of the liquidpaint analyzed whereas the technique shown in this practiceprovides a more complete picture of what is in the containerprovided. In addition, user expertise and time required tocollect a spectrum is minimal versus traditional standards.6. Apparatus6.1 Sp
11、ectrophotometerAn FT-IR spectrophotometer witha wavelength range of at least 600 to 4000 cm-1and aresolution no less than 4 cm-1.6.2 Multi or Single Bounce Horizontal Attenuated TotalReflectance (ATR) TroughFor many paint samples, a 45degree single bounce Fresnel-type ZnSe crystal has been foundto p
12、rovide satisfactory results for most liquid paints. Paintsamples unsuitable for this setup will exhibit many 100 %absorptions not to be confused with the 100 % absorptionsassociated with the spectral cutoff of the instrument optics andcrystal material. It should be noted that ATR spectra areinfluenc
13、ed by the depth of penetration of the infrared wave intothe sample which can be influenced by the type of crystalmaterial. Two spectra obtained using different crystal materialscan appear different. For finite comparison of like materials itis recommended that only spectra obtained with the samecrys
14、tal material be compared.1This guide is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings, Materials, and Applications and is the direct responsibility ofSubcommittee D01.21 on Chemical Analysis of Paints and Paint Materials.Current edition approved June 1, 2011. Published Ju
15、ne 1, 2011. DOI: 10.1520/D7588-11.2For referenced 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.1Copyright ASTM Internation
16、al, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.7. Procedure7.1 Ensure that the contents of the container are homoge-neous.7.2 Collect a background infrared spectrum with the ATRtrough in place. It is recommended that a new background becollected before the an
17、alysis of each sample.7.3 Fill the trough with the sample and then immediatelycollect an infrared spectrum from 600 to 4000 cm-1at aresolution of no less than 4 cm-1or as agreed upon betweeninterested parties. This step shall be completed within 1 minuteor noted otherwise and sufficient sample shall
18、 be used tominimize any effect due to solvent loss and/or reaction withatmospheric components. Very small sample quantities, signifi-cantly less than 1 milliltre for example, may be prone to suchchanges depending on the volatility of any solvents present andreactivity to atmospheric components such
19、as water and/orcarbon dioxide.7.4 Annotate sample infrared spectrum with all informationnecessary to reproduce the spectrum. This information shallinclude at a minimum:7.4.1 Sample identification including product color and IRcollection date,7.4.2 ATR crystal type and configuration, and7.4.3 Identif
20、ication of any manipulation of the spectrumsuch as but not limited to baseline and ATR corrections.7.5 Compare spectrum to reference spectra as needed.8. Report8.1 Properly identify and label the spectrum collected.Identification should include sample name, batch number, dateand time, analyst and/or
21、 company name, ATR crystal material,ATR apparatus name, spectral correction applied if any, andany other information necessary to duplicate the samplingand/or spectral collection. Example spectra are shown in Figs.1-59. Keywords9.1 infrared spectra; paint; solventFIG. 1 Liquid Epoxy Part AD7588 112F
22、IG. 2 Liquid Epoxy Part BD7588 113FIG. 3 Liquid AlkydD7588 114FIG. 4 Liquid Urethane Part AD7588 115ASTM 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 dete
23、rmination 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 revised, either reapproved or
24、 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 attend. If you feel tha
25、t 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 States. Individual reprints
26、(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 ASTM website (www.astm.org/COPYRIGHT/).FIG. 5 Liquid Urethane ConverterD7588 116
