1、BRITISH STANDARDBS EN ISO 7142:2007Binders for paints and varnishes Epoxy resins General methods of testThe European Standard EN ISO 7142:2007 has the status of a British StandardICS 87.060.20g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g4
2、0g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN ISO 7142:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 March 2007 BSI 2007ISBN 978 0 580 50379 5National forewordThis British Standard
3、was published by BSI. It is the UK implementation of EN ISO 7142:2007. It supersedes BS EN ISO 7142:2004 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee STI/3, Paints, media and related products.A list of organizations represented on STI/3 can be obtai
4、ned 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.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments issued since publicationAmd. No. Date
5、 CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 7142February 2007ICS 87.060.20 Supersedes EN ISO 7142:2004 English VersionBinders for paints and varnishes - Epoxy resins - Generalmethods of test (ISO 7142:2007)Liants pour peintures et vernis - Rsines poxydiques -Mthodes gnrales dessai
6、 (ISO 7142:2007)Bindemittel fr Beschichtungsstoffe - Epoxidharze -Allgemeine Prfverfahren (ISO 7142:2007)This European Standard was approved by CEN on 6 February 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStan
7、dard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French,
8、 German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech
9、 Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN D
10、E NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2007 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 7142:2007: EForeword This document (EN ISO 7142:2007) has been prepared by T
11、echnical Committee ISO/TC 35 “Paints and varnishes“ in collaboration with Technical Committee CEN/TC 139 “Paints and varnishes“, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsem
12、ent, at the latest by August 2007, and conflicting national standards shall be withdrawn at the latest by August 2007. This document supersedes EN ISO 7142:2004. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement
13、this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and U
14、nited Kingdom. Endorsement notice The text of ISO 7142:2007 has been approved by CEN as EN ISO 7142:2007 without any modifications. EN ISO 7142:2007Reference numberISO 7142:2007(E)INTERNATIONAL STANDARD ISO7142Second edition2007-02-01Binders for paints and varnishes Epoxy resins General methods of t
15、est Liants pour peintures et vernis Rsines poxydiques Mthodes gnrales dessai EN ISO 7142:2007ii iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally c
16、arried 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 organizations, governmental and non-governmental, in liaison with ISO, also take part in the wor
17、k. 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 the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare Inter
18、national 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 % of the member bodies casting a vote. Attention is drawn to the possibility that some of th
19、e 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 7142 was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee SC 10, Test methods for binders for paints and varnishes, in co
20、llaboration with CEN Technical Committee CEN/TC 139, Paints and varnishes. This second edition cancels and replaces the first edition (ISO 7142:1984), which has been editorially revised and the normative references updated. EN ISO 7142:2007blank1Binders for paints and varnishes Epoxy resins General
21、methods of test 1 Scope This International Standard specifies general methods of test for epoxy resins for use in paints, varnishes and similar products. It is also applicable to those solutions made from epoxy resins that are intended for use as binders for paints and varnishes. The test methods to
22、 be applied to an individual epoxy resin shall be the subject of agreement between the interested parties. The test methods described in this International Standard are not intended for epoxy esters (see Note to 3.1). 2 Normative references The following referenced documents are indispensable for th
23、e application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 385, Laboratory glassware Burettes ISO 648, Laboratory glassware One-mark pipettes ISO 1523, Determinati
24、on of flash point Closed cup equilibrium method ISO 2431, Paints and varnishes Determination of flow time by use of flow cups ISO 3001, Plastics Epoxy compounds Determination of epoxy equivalent ISO 3146, Plastics Determination of melting behaviour (melting temperature or melting range) of semi-crys
25、talline polymers by capillary tube and polarizing-microscope methods ISO 3219, Plastics Polymers/resins in the liquid state or as emulsions or dispersions Determination of viscosity using a rotational viscometer with defined shear rate ISO 3251, Paints, varnishes and plastics Determination of non-vo
26、latile-matter content ISO 3679, Determination of flash point Rapid equilibrium closed cup method ISO 4615, Plastics Unsaturated polyesters and epoxide resins Determination of total chlorine content ISO 4625-1, Binders for paints and varnishes Determination of softening point Part 1: Ring-and-ball me
27、thod ISO 4625-2, Binders for paints and varnishes Determination of softening point Part 2: Cup-and-ball method ISO 4630-1, Clear liquids Estimation of colour by the Gardner colour scale Part 1: Visual method EN ISO 7142:20072 ISO 4630-2, Clear liquids Estimation of colour by the Gardner colour scale
28、 Part 2: Spectrophotometric method ISO 6271-1, Clear liquids Estimation of colour by the platinum-cobalt scale Part 1: Visual method ISO 6271-2, Clear liquids Estimation of colour by the platinum-cobalt scale Part 2: Spectrophotometric method ISO 15528, Paints, varnishes and raw materials for paints
29、 and varnishes Sampling ISO 21627-2, Plastics Epoxy resins Determination of chlorine content Part 2: Easily saponifiable chlorine 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 epoxy resin synthetic resin containing epoxy groups generally pr
30、epared from epichlorhydrin and a bisphenol ISO 4618:2006 NOTE Epoxy esters obtained by reacting materials containing epoxy groups with fatty acids or oils which dry by oxidation are not covered by this International Standard. 4 Sampling Take a representative sample of the product to be tested, as de
31、scribed in ISO 15528. 5 Test methods See Table 1. 6 Test report The test report shall contain at least the following information: a) the type and identification of the product tested; b) a reference to this International Standard (ISO 7142:2007); c) the results of the tests, and the methods used; d)
32、 any deviation, by agreement or otherwise, from the procedures specified; e) the dates of the tests. EN ISO 7142:20073Table 1 Properties and methods of test Property Test method Colour ISO 4630-1 or ISO 4630-2 (Gardner colour scale) or ISO 6271-1 or ISO 6271-2 (Platinum-cobalt scale) Viscosity a bIS
33、O 3219 or another agreed method Volatile or non-volatile matter ISO 3251 cFlashpoint aISO 1523 ISO 3679 Epoxy equivalent ISO 3001 Hydroxyl value Annex A Total chlorine content ISO 4615 Easily saponifiable chlorine ISO 21627-2 Melting point ISO 3146 Softening point ISO 4625-1 or ISO 4625-2 aFor epoxy
34、 resin solutions, liquid resins and resins in test solutions only. Solid epoxy resins shall be tested in a standard test solution of 40 % (by mass) in diethylene glycol mono-n-butyl ether. The solvent used and the concentration of the test solution shall be indicated in the test report. bIf the flow
35、-time is used for the characterization of the flow behaviour, it shall be determined by the method specified in ISO 2431. cTake a test portion of 5 g and heat it at 140 C for 3 h without addition of solvent, as described in ISO 3251. EN ISO 7142:20074 Annex A (normative) Hydroxyl value A.1 Reagents
36、During the analysis, use only reagents of recognized analytical grade and only distilled water or water of equivalent purity. WARNING Take all necessary safety precautions when using the reagents A.1.1 to A.1.3. A.1.1 Pyridine. The pyridine shall be clear and shall not cause any significant colour d
37、uring the blank test. A.1.2 Pyridinium perchlorate. Slowly add 144 g of 70 % (by mass) perchloric acid to 120 ml of pyridine, keeping the mixture cool. Recrystallize the precipitate twice in hot water and allow it to dry in air. A.1.3 Acetic anhydride/pyridine mixture. Mix 12 g of 95 % (by mass) ace
38、tic anhydride with 88 g of pyridine. Store the mixture in an airtight bottle and in the dark. A.1.4 Potassium hydroxide, methanolic standard volumetric solution, c(KOH) = 1 mol/l. A.1.5 Phenolphthalein, 10 g/l solution in 95 % (by volume) ethanol, methanol or 2-propanol. A.2 Apparatus Ordinary labor
39、atory apparatus and A.2.1 Conical flask, of capacity about 250 ml, fitted with a ground-glass joint. A.2.2 Reflux condenser, with ground-glass joint, fitting on the conical flask (A.2.1). A.2.3 Burette, of capacity 50 ml, complying with the requirements of ISO 385, for the potassium hydroxide soluti
40、on (A.1.4). A.2.4 Pipette, of capacity 25 ml, complying with the requirements of ISO 648. A.2.5 Suitable heating device. A.3 Procedure A.3.1 General Carry out the determination in duplicate. EN ISO 7142:20075A.3.2 Test portion Select the mass of the test portion according to the expected epoxy equiv
41、alent (see Table A.1). Weigh, to the nearest 1 mg, the test portion into the conical flask (A.2.1). Table A.1 Mass of test portion Mass of test portion Mass of pyridinium perchlorate Epoxy equivalent g g up to 180 4,00 above 180 to 195 3,50 above 195 to 215 3,25 above 215 to 240 2,5 3,00 above 240 t
42、o 290 3,00 above 290 to 350 2,50 above 350 to 425 2,00 above 425 to 515 1,75 above 515 to 650 1,35 above 650 to 760 1,10 above 760 3,0 1,00 A.3.3 Determination Weigh the corresponding mass of pyridinium perchlorate (A.1.2) given in Table A.1 into the conical flask (A.2.1). Add by the pipette (A.2.4)
43、 25 ml of acetic anhydride/pyridine mixture (A.1.3). Warm the mixture until the test portion is completely dissolved. Fit the reflux condenser (A.2.2) onto the conical flask, heat to boiling and maintain at the boiling point under reflux for 30 min. Add 2 ml of water and 10 ml to 15 ml of pyridine (
44、A.1.1) to the top of the condenser so as to rinse the condenser tube. Mix the contents of the flask and cool to ambient temperature. Add 3 drops of phenolphthalein solution (A.1.5) and titrate with potassium hydroxide solution (A.1.4). A.3.4 Blank test Carry out a blank test, following the same proc
45、edure but omitting the test portion and the pyridinium perchlorate (A.1.2). A.4 Expression of results A.4.1 Calculation Calculate the hydroxyl equivalent by the equation (),20111000HE5 5692 000EEmVVm=+EN ISO 7142:20076 Calculate the hydroxyl value by the equation ,56 109 1000 56 109HVHE HE= where EE
46、 is the epoxy equivalent, in grams per mole, determined by the method specified in ISO 3001; HE is the hydroxyl equivalent, in grams of resin per equivalent of hydroxyl group (OH); HV is the hydroxyl value, in grams of potassium hydroxide per kilogram; m1is the mass, in grams, of the test portion (A
47、.3.2); m2is the mass, in grams, of pyridinium perchlorate (A.1.2) used; V0is the volume, in millilitres, of potassium hydroxide solution (A.1.4) required for the blank test (A.3.4); V1is the volume, in millilitres, of the potassium hydroxide solution (A.1.4) required for the determination (A.3.3). A
48、.4.2 Precision A.4.2.1 Repeatability (r) The value below which the absolute difference between two single test results, obtained on identical material by one operator in one laboratory using the same equipment within a short interval of time using the standardized test method, may be expected to lie
49、 with a 95 % probability is 10 %. A.4.2.2 Reproducibility (R) The value below which the absolute difference between two single test results, obtained on identical material by operators in different laboratories using the standardized test method, may be expected to lie with a 95 % probability is 20 %. EN ISO 7142:20077Bibliography 1 ISO 4618:2006, Paints and varnishes Terms and definitions EN ISO 7142:2007BS EN ISO 7142:2007BSI389 Chiswick High RoadLondonW4 4ALBSI British Sta
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