1、Designation: D 6605 06Standard Practice forDetermining the Color Stability of Hydrocarbon Resins AfterHeating1This standard is issued under the fixed designation D 6605; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of l
2、ast revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This practice covers determination of the color stabilityof a hydrocarbon resin by exposure to a specific temperature
3、for a defined time period in a forced-draft oven.1.2 Color stability is measured by the change in color of thetest resin, measured via the yellowness index color scale, inaccordance with Practice E 313, or the procedure for GardnerColor, Test Method D 6166.1.3 The values stated in SI units are to be
4、 regarded asstandard. The values given in parentheses are for informationonly.1.4 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 standard to establish appro-priate safety and health practices and deter
5、mine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D 6166 Test Method for Color of Naval Stores and RelatedProducts (Instrumental Determination of Gardner Color)D 6440 Terminology Relating to Hydrocarbon ResinsE 313 Practice for Calculating Yell
6、owness and WhitenessIndices from Instrumentally Measured Color Coordinates3. Terminology3.1 Definitions:3.1.1 For definitions of terms relating to hydrocarbon resins,see Terminology D 6440.4. Summary of Practice4.1 Specimens of the hydrocarbon resin(s) to be tested areplaced in 250-mL (8-oz) glass j
7、ars, which are placed in aheating block that is in a ventilated oven set at 175C. Thesamples are kept in the oven for an agreed upon period. At theend of this time, the samples are removed and allowed to cool.After cooling, the samples are dissolved in toluene. The colorof each aged resin solution i
8、s measured and compared to thatof a solution of the corresponding unaged resin. This colorincrease is a measure of the (lack of) stability of the resin.5. Significance and Use5.1 This practice is useful for both quality control andresearch.6. Apparatus and Materials6.1 Forced Draft Oven, with the ve
9、ntilation set at maximumcapacity.6.2 Aluminum Block, equipped with a control thermocouple(see Fig. 1).6.3 Temperature Indicator.6.4 Glass Jars, 250 mL (8 oz), with suitably lined screwcap.NOTE 1TFE-fluorocarbon-lined caps work well.6.5 Balance, readable to at least 0.1g.6.6 Shaker: used to facilitat
10、e the dissolution of the resinspecimens.6.7 Spectrophotometer or Tristimulus Colorimeter.7. Reagents7.1 Reagent Grade Toluene, or other agreed-upon solvent(for example, xylene), for dissolving resins.8. Procedure8.1 Weigh 10.0 6 0.1 g of resin into each specimen jar.8.2 Tap each jar gently to flatte
11、n the resin layer.NOTE 2Avoid having resin stick to the wall of the jar, since this tendsto bias the results high.1This practice is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings, Materials, and Applications and is the direct responsibility ofSubcommittee D01.38 onHydrocar
12、bon Resins.Current edition approved Nov. 1, 2006. Published November 2006. Originallyapproved in 2000. Last previous edition approved in 2000 as D 6605 - 00.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of AS
13、TMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.8.3 Install the aluminu
14、m block (see Fig. 1) in the center ofan electronically regulated oven with the ventilation set atmaximum.8.4 Set the oven controls so that the control thermocouplereads 175.0C 6 0.5C.8.5 WarningAn increase or decrease in the oven tem-perature from the specified temperature may alter the results.NOTE
15、 3It generally takes about4htostabilize the aluminum block at175C, when starting from room temperature.8.6 Place the uncapped jar(s) containing the resin(s) to betested in the holes in the 175C aluminum block in the ovenand allow it to remain for the chosen time. A test time of 5 or16 h is usually u
16、sed, but other, agreed upon times may be used.8.7 WarningSample contamination may cause unex-pected results.8.8 Remove the jar(s) after the desired test time, seal andallow to cool for at least 30 min. After cooling, add 10 g oftoluene to each jar and close tightly. For each resin sample, toanother
17、jar add 10 6 0.1 g of the unaged resin and 10 g oftoluene; then shake the jars until the resin dissolves.8.9 Measure tristimulus values for CIE 1931 standard ob-server and Illuminant C. Calculate yellowness index (YI)values in accordance with Practice E 313 or calculate Gardnercolor values in accord
18、ance with Test Method D 6166.9. Report9.1 Report the following information:9.1.1 Complete identification and description of the materialtested,9.1.2 Description of the instrument used for the colormeasurement,FIG. 1 Measurements in MillimetresD66050629.1.3 The color of the sample before and after th
19、e test, and9.1.4 State the test duration, and the solvent usedifdifferent from toluene.10. Keywords10.1 color stability; Gardner color; hydrocarbon resins;yellowness index, (YI)SUMMARY OF CHANGESSubcommittee D01.38 has identified the location of selected changes to this standard since the last issue
20、(D 6605 - 00) that may impact the use of this standard. (Approved November 1, 2006.)(1) Section 3 Added a Terminology section and increased thenumbering of the subsequent sections.(2) 4.1 Changed the wording.(3) 6.6 Omitted “heat aged.” Added “specimens.”(4) Section 8 Changed “Sample Preparation” to
21、 “Proce-dure.” Omitted the original “8. Procedure.”(5) 8.6 and 8.7 Changed the wording.ASTM 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
22、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 withdrawn. Y
23、our 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 commen
24、ts 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).D6605063
