1、 STD-BSI BS EN IS0 LObL-ENGL I779 36246b7 0903823 709 9 BRITISH STANDARD Plastics - Unplasticized cellulose acetate - Determination of free acidity The European Standard EN IS0 1061:1999 has the status of a British Standard ICs 83.080.20 BS EN IS0 1061:1999 Incorporating Corrigendum No. 1 NO COPYING
2、 WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW STD-BSI BS EN IS0 3063-ENGL 1999 Lb24669 0903824 645 BS EN IS0 1061:1999 10819 Corr. No. 1 National foreword March 2001 Addition of supersession details to national foreword This British Standard is the English language version of EN IS0 1
3、061:1999. It is identical with IS0 1061:1990. This British Standard supersedes BS 2782-4 method 459A:1991 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee PRU82, Thermoplastic materials, which has the responsibility to: - - aid enquirers to understand
4、the text; present to the responsible internationaVEuropean committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. - A list of organizations represented on this
5、committee can be obtained on request to its secretary. Cross-references Attention is drawn to the fact that CEN and CENELEC Standards normally include an annex which lists normative references to international publications with their corresponding European publications. The British Standards which i
6、mplement these international or European publications may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all t
7、he 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 pages This document comprises a front cover, an inside front cover, the EN IS0 tit
8、le page, the EN IS0 foreword page, the IS0 title page, page ii, pages 1 and 2, the annex ZA page 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 Committee
9、for Materials and Chemicals, was published under the authority of the Standards Committee and comes into effect on 15 October 1999 Amendments issued since publication Amd. No. IDate I Comments 0 BSI 03-2001 ISBN O 580 35107 6 STD*BSI ES EN IS0 1061-ENGL 1999 lb24bb9 0903825 SBL EUROPEAN STANDARD EN
10、IS0 1061 NORME EUROPENNE EUROPISCHE NORM June 1999 ICs 83.080.00 English version Plastics - Unplasticized cellulose acetate - Determination of free acidity (IS0 1061 : 1 990) Plastiques - Acate de cellulose non plas - termlnatbn de laddlt libre (Is0 1081:199) Kunststoffe - Welchmechemeies Ceilulosea
11、tat - Wmmung der fielen mure (Is0 1061:1990) This European Standard was approved by CEN on 6 May 1899. CEN members are bound to comply with the CENICENELEC Intemal Regulatlons which stipulate the amditions for gMng this European Standard the status of a national sandad without any alteration. Up-to-
12、date lists and Mbliographkai references concemlng such national standatds may be obtained on appcation io the central Secretariat or to any CEN member. This European Stendard exlsts In three offldal versions (English, French, Gem). A version in any other lenguage made by translation under the respon
13、sibility of a CEN member into Its own language and nofied to the Central Secretariat has the same stetus as the offidal VerSIonS. CEN members are the national stendards bodies of Austria, Belgium, Czech Republic, Denmark, Flnland, France, Germany, Greece, Iceland, Ireland, My, Luxembourg, Nethetiand
14、s, Norway, Portugel, Spahi, Sweden, swittetiand and Unlted Kingdom. EUROPEAN COMhlTEE FOR STANDARDEATiON COMITE EUROPEEN DE NORMALISATION EUROPISCHES KOMITEE FUR NORMUNG Central s.crStarlat rue de Stassart, 36 B-lOM) Brussels O 1999 CEN All fights of exploitation in any form and by any means resenre
15、d worldwide for CEN national Members. Ref. No. EN IS0 1061:1999 E STD-BSI BS EN IS0 LObL-ENGL 1999 I Lb24bb9 090382b 418 = EN IS0 1061:1999 Foreword The text of the International Standard from Technical Committee ISO/TC 61 “Plastics“ of the Intemational Organization for Standardization (ISO) has bee
16、n taken over as an European Standard by Technical Committee CEN/TC 249 “Plastics“, the secretariat of which is held by IBN. This European Stanard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by December 1999, and confli
17、cting national standards shall be withdrawn at the latest by December 1999. 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, Denmark, Finland, France, Ger
18、many, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of the International Standard IS0 1061:199 has been approved by CEN as a European Standard without any modification. NOTE: Normative refere
19、nces to International Standards are listed in annex ZA (normative). STD-BSI BS EN IS0 LObL-ENGL 1999 m Lb24hhi CI903827 354 EN IS0 1061:1999 INTER NATIONAL STANDARD IS0 1061 Second edition 1990-11-15 Plastics - Unplasticized cellulose acetate - Determination of free acidity Plasfiques - Actae de cel
20、lulose non plastifi - Dtermination de lacidit libre Reference number IS0 1061:1990(E) STD-BSI BS EN IS0 LObZ-ENGL 1999 lb24bb9 0903828 290 EN IS0 1061:1999 Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). Th
21、e work of preparing International Standards is normally carried out through IS0 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, govern- mental and non-g
22、overnmental, in liaison with EO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for
23、 voting. Publication as an Inter- national Standard requires approval by at least 75% of the member bodies casting a vote. International Standard IS0 1061 was prepared by Technical Committee ISO/TC 61, Plastics. This second edition cancels and replaces the first edition (IS0 1061:1975), of which it
24、constitutes a minor technical revision. Descriptors: plastics, cellulose acetate, unplasticized cellulose acetate, chemical analysis, determination, acidity, acidimetry. i STD-IS1 BS EN IS0 LObL-ENGL L9 m Lb2Yhh I1903829 127 W EN IS0 1061:1999 Plastics - Unplasticized cellulose acetate - Determinati
25、on of free acidity WARNING - The use of this international Standard may involve hazardous materials, operations and equipment. This standard does not purport to address all o the safety problems associated with its use. it is the responsibility of the user of this standard to establish appropriate s
26、afety and health practices and determine the applicability of regulatory limitations prior to use. 1 scope This International Standard specifies a method for the determination of the amount of free acid in unplasticized cellulose acetate. The free acidity determined by this method includes acidity e
27、xtractable by water and acidity due to acidic groups directly attached to the cellulose acetate, e.g. carboxyl groups. The latter is usually a very small proportion of the total. This method is not suitable for cellulose acetate containing any additives which may affect the test. 2 Normative referen
28、ces The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publi- cation, the editions indicated were valid. All stan- dards are subject to revision, and parties to agreements based on this International
29、Standard are encouraged to investigate the possibility of ap- plying the most recent editions of the standards in- dicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 565:1990, Test sieves - Metal wire cloth, pero- rated metal plate and electrofor
30、med sheet - Nominal sizes of openings. IS0 585: 19901, Plastics - Unplasticized cellu/ose acetate - Defemination of moisture content. 3 Principle A test portion of cellulose acetate is treated with water and the resultant solution titrated with sodium hydroxide solution. The free acidity is calculat
31、ed as the percentage, by mass. of free acetic acid in the cellulose acetate. 4 Reagents During the determination, use only reagents of cognized analyticai grade and distilled water specified in 4.1. re- as 4.1 Distilled water, freshly boiled to remove carbon dioxide and cooled. 4.2 Sodium hydroxide,
32、 standard volumetric sol- ution, c(Na0H) = 0,O mol/l. 4.3 Phenolphthalein, 1 g/l solution in 90 YO (l/V) ethanol. 5 Apparatus 5.1 Glass flask, capacity 250 ml or 300 ml, with ground-glass stopper. 5.2 Graduated cylinder, capacity 250 ml, graduated at 2 rnl intervals. 1) To be published. 1 STD-BSI BS
33、 EN IS0 LObL-ENGL I999 8. Lb24bb9 0903830 949 H EN IS0 1061:1999 5.3 Burette, capacity 25 ml, graduated at 0,05 ml intervals: protected against carbon dioxide by a soda lime tube. 5.4 Analytical balance, accurate to 0,Ol g 6 Test sample 6.1 The sample of cellulose acetate shall be in the form of a p
34、owder passing entirely through a sieve of mesh 710 pm as defined in IS0 565; if it does not, it shall be ground. 6.2 Determine the moisture content of the sample in accordance with IS0 585. 7 Procedure 7.1 Weigh, to the nearest 0,Ol g, 10 g or more, de- pending on the expected free acidity, of the s
35、ample of cellulose acetate into the flask (5.1). 7.2 Add 150 ml of distilled water (4.1), measured with the 250 ml graduated cylinder (5.2). 7.3 Condition the stoppered flask at a temperature between 20 “C and 27 “C either for 3 h with gentle shaking for 5 min every 30 min, or for 1 h with con- tinu
36、ous shaking. 7.4 Titrate with the sodium hydroxide solution (4.2), using phenolphthalein (4.3) as indicator. It is important that the titration is carried out rapidly to avoid saponification of the cellulose acetate and absorption of carbon dioxide from the atmosphere. 7.5 Perform a blank test, intr
37、oducing only 150 ml of distilled water into the flask. Allow to stand for 3 h or shake for 1 h in the same way as for the sample at a temperature between 20 “C and 27 “C. Titrate quickly with the sodium hydroxide solution (4.2), using phenolphthalein (4.3) as indicator. 7.6 Carry out two complete de
38、terminations. If the difference between the determinations is greater than 10 % of the mean, repeat the test. 8 Expression of results where C v, v2 m 6 is the actual concentration, in moles of NaOH per litre, of the sodium hydroxide solution (4.2) used; is the volume, in millilitres, of sodium hydro
39、xide solution (4.2) required to titrate the solution obtained from the test por- tion; is the volume, in millilitres, of sodium hydroxide solution (4.2) required to titrate the blank; is the mass, in grams, of dry cellulose acetate used in the test, calculated from the mass of the test portion and i
40、ts moisture content determined as specified in 6.2; is the mass, in milligrams, of acetic acid corresponding to 1,OO ml of sodium hy- droxide solution, c(Na0H) = 0,100 mol/l. 8.2 Report the mean of the two determinaiions. 9 Precision The precision of this test method is not known be- cause inter-lab
41、oratory data are not available. This method may not be suitable for use in specifications or in case of disputed results as long as these data are not available. 10 Test report The test report shall include the following partic- ulars: a reference to this International Standard; all details necessar
42、y for the complete identifica- tion of the product tested, including type, manu- facturers code number, source, trade name, etc.; treatment of the sample before the test, if any; the free acidity; the date of the test. 8.1 The free acidity, expressed as grams of acetic acid per 100 g of dry cellulos
43、e acetate, is calculated from the formula 6c(V., - V m 2 STD-BSI BS EN IS0 L0hL-ENGL L999 3624bb9 0903833 885 EN IS0 1061:1999 Annex ZA (normative) Normative references to International publications with their relevant European publications This European Standard incorporates by dated or undated ref
44、erence, 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 European Standard only when incorpo
45、rated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. IS0 585 1990 Plastics - Unplasticized cellulose acetate - EN IS0 585 1999 Determination of moisture content BS EN IS0 1061:1999 BSI 389 Chiswick High Road London w4 4AL BSI - Briti
46、sh Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of Br
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