1、Designation: D3312 04 (Reapproved 2013)D3312 18Standard Test Method forPercent Reactive Monomer in Solventless Varnishes1This standard is issued under the fixed designation D3312; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the
2、 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. Scope Scope*1.1 This test method covers the determination of the percent of volatile reactive monomer having a vapor p
3、ressure exceeding13.3 Pa (0.1 Torr) at 25C in an uncatalyzed solventless varnish. Experience has shown this method does not accurately determinepercent reactive monomer when the vapor pressure is less than 13.3 Pa (0.1 Torr).1.2 The values stated in SI units are the standard. The values given in par
4、entheses are for information only.1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety safety, health, and healthenvironmental practices and determine theapplica
5、bility of regulatory limitations prior to use. For a specific precaution, see Section 5.NOTE 1There is no similar or equivalent ISO/IEC standard.1.4 This international standard was developed in accordance with internationally recognized principles on standardizationestablished in the Decision on Pri
6、nciples for the Development of International Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2D1711 Terminology Relating to Electrical InsulationD5423 Specification for Forced-Convection
7、 Laboratory Ovens for Evaluation of Electrical Insulation3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 reactive monomer, nin solventless electrical varnish, a substance, that, when added to a resin, will combine chemicallywith that resin under specified conditions.3.2 See Te
8、rminology D1711 for definitions of other terms relating to electrical insulation.4. Significance and Use4.1 The percent of reactive monomer in solventless varnishes will affect the viscosity, the handling, and the processingproperties of the uncured resin. The percent of reactive monomer will possib
9、ly affect the degree of hardness and shrinkage whichin turn will affect the physical and electrical properties of the cured resin.5. Safety Precautions5.1 It is unsafe to use varnish at temperatures above the flash point without adequate ventilation, especially if the possibilityexists that flames o
10、r sparks are present. Store varnish in sealed containers.6. Apparatus6.1 Balance, capable of weighing to nearest 0.0001 g.6.2 ThermometerA glass thermometer having a range from 0 to 200C (30 to 400F) and accurate within 61C (62F).1 This test method is under the jurisdiction of ASTM Committee D09 on
11、Electrical and Electronic Insulating Materials and is the direct responsibility of SubcommitteeD09.01 on Electrical Insulating Varnishes, Powders and Encapsulating CompoundsProducts.Current edition approved April 1, 2013Nov. 1, 2018. Published April 2013November 2018. Originally approved in 1974. La
12、st previous edition approved in 20092013 asD3312 04 (2009).(2013). DOI: 10.1520/D3312-04R13.10.1520/D3312-18.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the stan
13、dards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurate
14、ly, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Dri
15、ve, PO Box C700, West Conshohocken, PA 19428-2959. United States16.3 OvenA forced-draft constant-temperature oven conforming to Specification D5423, Type II.6.4 Bottle and Drying DishesA stoppered bottle and flat-bottom aluminum drying dish. having an inside diameter ofapproximately 70 mm (234 in.)
16、and a depth of 8 mm (516 in.).6.5 DesiccatorA suitable desiccator containing anhydrous calcium chloride (CaCl2).7. Test Specimens7.1 Preparing SpecimensPlace a portion of the uncatalyzed solventless varnish in a stoppered bottle and weigh. Transfer aspecimen weighing between 0.2 and 0.3 g from the w
17、eighed stoppered bottle to a weighed drying dish, which has been previouslyheated for 30 min at 150C (300F) and cooled in a desiccator. Weigh the stoppered bottle with the remaining contents again.Determine the exact weight of the specimen transferred to the drying dish by the difference in weight o
18、f the stoppered bottle.Prepare two or more specimens from the contents of the stoppered bottle.8. Procedure8.1 Dilution of SpecimensAdd 5 6 1 mL of methyl isobutyl ketone (MIBK) to each specimen in the drying dish. Mix thespecimen and the MIBK by moving the drying dishes in a circular direction. Mix
19、ing on a hot plate at temperatures below 65C(150F) is permissible. Take care to prevent any loss of solvent or specimen by spillage.8.2 Drying SpecimensPlace the specimens in constant-temperature oven which has been stabilized at 150C (300F) within15 min after mixing. Keep the specimens in the 150C
20、(300F) oven for 15 min.8.3 Weighing Dried SpecimensAt the termination of the 15-min heating period, remove the specimens to a desiccator and coolto room temperature. Weigh each specimen immediately upon removal from the desiccator.9. Calculation9.1 Calculate the percentage of monomer by weight as a
21、ratio of the weight loss of the dried specimen to the weight of thespecimen in the original state, expressed as a percentage, as follows:%monomer5weight loss/original sample weight! 3100 (1)9.2 Calculate the average of the specimens tested. This is the percent reactive monomer.10. Report10.1 Report
22、the following information:10.1.1 Identification of the solventless varnish, and10.1.2 Percent reactive monomer.11. Precision and Bias11.1 PrecisionThe interlaboratory standard deviation calculated from the results of testing in six laboratories is as follows:3Monomer Interlaboratory Standard Deviati
23、on (%)Styrene 0.365Vinyl toluene 0.163t-butyl styrene 1.61Diallyl phthalate 1.9911.2 BiasThis test method has no bias, since the value for percent reactive monomer is determined solely in terms of this testmethod.12. Keywords12.1 monomer (See reactive monomer); reactive monomer; reactive monomer, %;
24、 solventless varnish; varnish3 Supporting data are available from ASTM Headquarters. Request RR:D09-1013.D3312 182SUMMARY OF CHANGESCommittee D09 has identified the location of selected changes to this standard since the last issue (D3312 04(2013) that may impact the use of this standard. (Approved
25、Nov. 1, 2018.)(1) Revised 7.1.(2) Added 9.2.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 the validity of any such patent rights, and
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