1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58conductivity of aqueous resin extractsICS 83.080.10Plastics Epoxy resins Determination of electrica
2、l BRITISH STANDARDBS ISO 21318:2007BS ISO 21318:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2007 BSI 2007ISBN 978 0 580 54887 1Amendments issued since publicationAmd. No. Date CommentsCompliance with a British Standard cannot
3、confer immunity from legal obligations.National forewordThis British Standard is the UK implementation of ISO 21318:2007.The UK participation in its preparation was entrusted to Technical Committee PRI/42, Fibre reinforced thermosetting plastics and prepregs.A list of organizations represented on th
4、is committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Reference numberISO 21318:2007(E)INTERNATIONAL STANDARD ISO21318First edition2007-02-01Plastics Epoxy re
5、sins Determination of electrical conductivity of aqueous resin extracts Plastiques Rsines poxy Dtermination de la conductivit lectrique des extraits aqueux de rsine BS ISO 21318:2007ii iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standard
6、s bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organiz
7、ations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in
8、the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % o
9、f the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 21318 was prepared by Technical Committee ISO/TC 61, Plastics
10、, Subcommittee SC 12, Thermosetting materials. BS ISO 21318:2007iv Introduction Where epoxy resins are used as insulation for electronic devices, ionic impurities such as chloride, sodium and catalyst residues present in the epoxy resin can cause failure of the device. Instead of determining these i
11、mpurities separately, a test method may be used to evaluate their contents as a whole by measuring the electrical conductivity of a resin extract obtained by extraction of the resin with water at an elevated temperature. Because of its practical usage and simplicity, this method is becoming widely u
12、sed in the quality control of epoxy resins for electronic insulation applications. BS ISO 21318:20071Plastics Epoxy resins Determination of electrical conductivity of aqueous resin extracts SAFETY STATEMENT Persons using this document should be familiar with normal laboratory practice, if applicable
13、. This document does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any regulatory requirements. 1 Scope This International Standard specifies
14、a method for the determination of the electrical conductivity of an aqueous extract obtained by extraction of an epoxy resin with water at 95 C. The method is applicable only to epoxy resins that are in the molten state at the extraction temperature (95 C). The method is important for epoxy resins w
15、hich are used as insulation materials for electronic devices. The electrical conductivity of the extract is used as a measure of the concentration of the ionic species in the resin. 2 Materials 2.1 Water. Use only distilled and/or deionized water, the electrical conductivity of which is below 2,0 S/
16、cm. 3 Apparatus 3.1 Electrical conductivity meter, accurate to 0,1 S/cm, which can be dipped into the aqueous extract and which has a temperature-compensation function. 3.2 Graduated glass cylinders, 100 ml. 3.3 Analytical balance, accurate to 0,01 g. 3.4 Air-circulation oven, capable of maintaining
17、 a temperature of 95 C 3 C. 3.5 High-density polyethylene bottle, 100 ml (with a screw cap). 3.6 Polyethylene cup, 100 ml. 4 Procedure 4.1 Weigh a test portion of 8,00 g 0,05 g into a 100 ml high-density polyethylene bottle (3.5). 4.2 Add 80 ml 2 ml of water (2.1) to the bottle and put on the cap. 4
18、.3 Put the bottle into the oven (3.4) which has been stabilized at 95 C. BS ISO 21318:20072 4.4 After 30 min, loosen the cap of the bottle to release the internal pressure in order to avoid possible bursting of the bottle. Then retighten the cap. WARNING Never fail to follow procedure 4.4. Wear prot
19、ective gloves and a face-shield when releasing the internal pressure. 4.5 After 20 h 0,5 h, remove the bottle from the oven and allow to cool to room temperature. 4.6 Pour the water into a polyethylene cup (3.6), and measure the electrical conductivity using the electrical conductivity meter (3.1) a
20、t 25 C. 4.7 Carry out a blank test, following the same procedure and using the same water but without the test portion. 5 Expression of results Calculate the electrical conductivity of the aqueous resin extract, expressed in microsiemens per centimetre (S/cm), from the following equation: = S Bwhere
21、 Sis the uncorrected electrical conductivity of the extract, expressed in microsiemens per centimetre (S/cm); Bis the electrical conductivity of the blank, expressed in microsiemens per centimetre (S/cm). 6 Precision Precision data were determined from a round-robin trial organized in 2002 and 2003
22、involving eight laboratories in Japan. Two commercial epoxy resins were tested and the results analysed in accordance with ISO 5725-2, Accuracy (trueness and precision) of measurement methods and results Part 2: Basic method for the determination of repeatability and reproducibility of a standard me
23、asurement method. The repeatability and reproducibility calculated from the trial are given in Table 1. Table 1 Precision data Type of epoxy resin Electrical conductivity (averaged) S/cm Repeatability srReproducibility sRBPA (bisphenol A type solid epoxy resin) 3,6 0,11 0,31 ECN (o-cresol novolac ty
24、pe solid epoxy resin) 1,1 0,04 0,10 BS ISO 21318:200737 Test report The test report shall include the following: a) a reference to this International Standard; b) all details necessary for identification of the sample; c) the test result; d) the date of the test; e) any other relevant information wh
25、ich may have influenced the test result. BS ISO 21318:2007BS ISO BSI389 Chiswick High RoadLondonW4 4AL21318:2007BSI British Standards InstitutionBSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international l
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