1、 STD-BSI BS EN L837-2-ENGL 2000 W Lb2Ybb9 0873806 078 a BRITISH STANDARD Products and systems for the protection and repair of concrete structures - Test methods - Reactive functions related to epoxy resins - Part 2: Determination of amine functions using the total basicity number The European Stand
2、ard EN 1877-2:2000 has the status of a British Standard ICs 91.080.40 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMIITED BY COPYRIGHT JAW 3s EN 1877-2:2000 STD-BSI BS EN 1877-2-ENGL 2000 m 3624669 0873807 TO4 m BS EN 1877-2:2000 Amd. No. Date National foreword Comments This British Standard is th
3、e official English language version of EN 1887-22000. The UK participation in its preparation was entrusted by Technical Committee B/517, Concrete, to Subcommittee B/517/8, Protection and repair of concrete, which has the responsibility to: - aid enquirers to understand the text; - present to the re
4、sponsible European committee any enquiries on the - monitor related international and European developments and promulgate interpretation, or proposals for change, and keep the UK interests informed; them in the UK. A iist of organizations represented on this subcommittee can be obtained on request
5、to its secrem. Cross-references The British Standards which implement intemational or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “Intemational Standards Correspondence Index”, or by using the “Find facility of the BSI Sta
6、ndards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of p
7、ages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 7 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. This British Standard, having been prepared under the direction of the Sector Committe
8、e for Building and Civil Engmeering, was published under the authority of the Standards Committee and comes into effect on 15 October 2000 O BSI l(2000 ISBN O 580 36600 6 STD.BSI BS EN 1877-2-ENGL 2000 M Lb24bb 0873808 740 lsl EUROPEAN STANDARD NORME EUROPENNE EN 1877-2 EUROPISCHE NORM July 2000 ICs
9、 91.080.40 English version Products and systems for the protection and repair of concrete structures - Test methods - Reactive functions related to epoxy resins - Part 2: Determination of amine functions using the total basicity number Produits et systmes pour la protection et la rparation des struc
10、tures en bton - Mthodes dessai - Fonctions ractives lies aux rsines poxydes - Partie 2: Dtermination des fonctions amines par lindice de basicit totale Produkte und Systeme fr den Schutz und die Instandsetzung von Betontragwerken - Prfverfahren - Reaktive, funktionelle Gruppen von Epoxidharzen - Tei
11、l 2: Bestimmung der Aminzahl anhand des Total basizittsgrades This European Standard was approved by CEN on 7 July 2000. CEN members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without
12、 any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made
13、 by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland,
14、Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMlTEE FOR STANDARDIZATION COMITI?, EUROPEEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Central Secretariat: rue de Stassart, 36 B-1050 Brussels O 2000 CEN All rights of exploita
15、tion in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1877-2:2000 E STDmBSI BS EN 11377-2-ENGL 2000 m Lb24bb9 0873809 887 H Page 2 EN 1877-2:2000 Contents Page Foreword . 2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Scope 3 Normative reference . 3 Terms and definitions 3 P
16、rinciple 3 Sampling . 3 Apparatus -*,. 3 Reagents . 4 Preparation of the perchloric acid (0,l mol) in acetic acid . 4 Standardization .4 Calculation of the concentration . 5 Procedure . 5 Calculation *-,.,. 5 Precision 6 Test report 6 Bibliography . . . 7 Foreword This European Standard has been pre
17、pared by Technical Committee CEN/TC 104 “Concrete (performance, production, placing and compliance criteria)”, 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 endorsement, at the latest
18、 by December 2002, and conflicting national standards shall be withdrawn at the latest by December 2002. According to the CENKENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic,
19、Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. This European Standard describes several type of test methods. Specifications for the products and systems for the repair and the protecti
20、on of concrete structures will be subject of separate standards. Page 3 EN 1877-2:2000 1 Scope This European Standard describes a method for determining total basicity number of amines and is applicable to amine-based hardeners used in the epoxy resins. 2 Normative reference This European Standard i
21、ncorporated by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this
22、European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). EN 21 512 Paints and varnishes - Sampling of products in liquid or paste form (IS0 1512 : 1991) 3 Terms and definitions Fo
23、r the purposes of this Standard, the following terms and definitions apply: 3.1 total basicity number quantity of perchloric acid necessary to neutralize the amine functions of 1 gram of the product. 4 Principle The total basicity number is determined by titration of the amine-nitrogen in an acetic
24、acid medium against 0,l mold perchloric acid. 5 Sampling A representative and homogeneous sample of the material to be tested shall be taken according to EN 21512. Eliminate mineral filler and pigments with a suitable organic solvent before the determination of the total basicity. It should be check
25、ed, that any solvent has really evaporated. 6 Apparatus - - - - - In addition, when prepared the 0,l mol/l perchloric acid in acetic acid. - - - - Balance, accurate to within 0,l mg. Calibrated burette, capacity 25 ml. Pipettes, capacity 10 ml and 20 mi. Conical flask, 100 ml or 200 ml, with ground
26、glass neck and ground glass stopper. Instrument and electrodes for potentiometric titration. Magnetic stirrer with polytetrafluoroethylene coated bar. Calibrated thermometer to permit temperature measurements within an accuracy of f 0,l K. Volumetric flask, 1 O00 ml. Graduated cylinders, 50 rnl and
27、500 ml. STD-BSI BS EN L877-2-ENGL 20013 II Lb211bb9 08738LL 435 U Page 4 EN 1877-212000 7 Reagents For the analysis, only reagents of analytical grade shall be used. - Perchloric acid 0,l mol/l in acetic acid (Standard volumetric solution). - Acetic acid 99 % to 100 YO. - Crystal violet, 0,l % in so
28、lution in acetic acid. - Potassium hydrogen phthalate. In addition, when prepared the 0,l mol/l perchloric acid in acetic acid. - - - Perchloric acid, 70 %. - - Phenolphthalein, 0,l % solution. - Distilled water. Acetic acid 99 Oh to 100 %. Acetic anhydride, purity 96 %. Sodium hydroxide solution, 0
29、,l mol/l. 8 Preparation of the perchloric acid (0,l mol/l) in acetic acid WARNING The use of safety goggles and a safety screen is recommended. Determination of the true percentage of the approximately 70 Yo (m/m) perchloric acid. Weigh approximately 0,3 g of the perchloric acid (El) in a 200 mi con
30、ical flash, add 50 ml distilled water and mix thoroughly. Titrate it against 0,l mol/l sodium hydroxide solution (V,) using the phenolphthalein indicator solution. The content of perchloric acid is given by the equation: where P El VI Fna = is the factor of the 0,l mol/l sodium hydroxide solution. =
31、 content of the perchloric acid ; = is the mass in (g), of the approximate 70 Yo perchloric acid ; = is the volume, in (mi), of the Oll mol/l sodium hydroxide solution ; Weigh the calculated mass of the 70 % aqueous solution of the perchloric acid to an accuracy of 0,l mg into a 1 O00 ml volumetric
32、flask. Add 300 mi of the acetic acid followed by 50 ml of the acetic anhydride under cooling. The temperature of the solution shall be kept at 20 OC. Dilute to 1000 ml with the acetic acid and mix thoroughly. The solution should not show any discoloration to yellow for a period of 12 h. Then carry o
33、ut the standardization. 9 Standardization a) Standardize this solution by titrating it in a 200 ml conical flask to 300 mg to 500 mg potassium hydrogen phthalate dissolved in 15 mi acetic acid, using the crystal violet indicator solution. If necessary, dry the potassium hydrogen phthalate for 24 hou
34、rs at 120 “C before use. Carry out the end-point determination using 4 to 6 drops of the crystal violet indicator solution, titrating until a stable green colour is obtained. Record the temperature t. of the standard volumetric solution. Carry out a double determination. NOTE same method for the sta
35、ndardization of the perchloric acid. If the potentiometric method is used for the determination of total basicity number, it is recommended to use the b) Alternative: Use the manufacturers concentration of the solution. STD*BSI BS EN LB77-2-ENGL 2000 m Lh24hh9 0873832 373 Page 5 EN 1877-212000 10 Ca
36、lculation of the concentration The concentration c of the perchloric acid solution in moles per litre is given by the equation : E2 c= V2 . 0,2042 where E2 : is the mass, in (g), of potassium hydrogen phthalate used ; V2 : is the volume, in (mi), of the perchloric acid solution used in the titration
37、. 11 Procedure - Weigh approximately 250 mg of the test portion to within 0,l mg and introduce into a 200 ml conical flask (this test sample will depend on the basicity of the product and may be modified). - Dissolve this test portion in 50 ml acetic acid. - If using the indicator method, add 4 to 6
38、 drops of crystal violet solution and titrate the solution on the magnetic stirrer with the perchloric acid solution. - Carry out the titration until a stable green colour is obtained. - If using the potentiometric method, place the electrodes in the test solution and titrate the solution on the mag
39、netic stirrer with the perchloric acid solution. - Note the temperature t of the perchloric acid solution in order to be able to allow for expansion of the solution with increasing temperature. - Carry out a blank test at the same time as the determination, following the same procedure and using the
40、 same reagents but omitting the test portion. 12 Calculation Calculate the basicity number, using the following formula : t - ts Basicity number (mol/kg) = m where m is the mass, in (g), of the test portion ; Vo is the volume, in (mi), of the perchloric acid solution used in the blank test ; VI is t
41、he volume, in (mi), of the perchloric acid solution used in the determination ; t is the temperature, in (“C), of the perchloric acid solution at the time of the determination and blank test ; ts is the temperature, in (OC), of the perchloric acid solution at the time of standardization ; c is the c
42、oncentration of the perchloric acid solution (usually 0,l mol/l) at the time of standardization. NOTE The use of the correction factor is recommended because of the significant coefficient of expansion of the perchloric acid solution (1,07 x loe3 K-), which corresponds to a volume variation of 0,l %
43、 per degree Kelvin. Use of this factor can be avoided by working in a temperature-controlled room. STD-BSI BS EN 1877-2-ENGL 2000 m lb24bb 0873833 208 h Page 6 EN 1877-212000 13 Precision Repeatability limit : 1 YO Reproducibility limit : 2 %. 14 Test report The test report shall include the followi
44、ng information : a reference to this European Standard ; all details necessary to identify the product tested ; the total basicity number (mol/kg) and the way in which it is expressed ; any other factor likely to have affected the result ; any deviations, by agreement or otherwise, from the procedur
45、e described ; the date of test. STD.BSI ES EN 1877-2-ENGL 2000 0 Lb24bL 0873834 144 0 Page 7 EN 1877-2:2000 Bibliography IS0 3001 : 1997 Plastics - Epoxy compounds - Determination of epoxy equivalent. BS EN 1877-2:2000 BSI 389 Chiswic, High Roa London w4 4AL BSI - British Standards Institution BSI i
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