1、BRITISH STANDARD BS EN ISO 1600:1999 Incorporating Amendment No.1 to BS2782-5: Method553A:1991 (renumbers the BS asBS EN ISO 1600: 1999) Plastics Celluloseacetate Determination of light absorption on moulded specimens produced using different periods of heating IMPORTANT NOTE. Before reading this me
2、thod it is essential to read BS2782-0, Introduction, issued separately. The European Standard EN ISO1600:1999 has the status of a BritishStandard ICS 83.080.20BSENISO1600:1999 This BritishStandard, having been prepared under the directionof the Plastics and Rubber Standards Policy Committee, was pub
3、lished underthe authority of the Standards Board and comesintoeffect on 31October1991 BSI04-2000 The following BSI references relate to the work on this standard: Committee reference PRM/21 Special announcement in BSINews, September1991 ISBN 0 580 20072 8 Committees responsible for this BritishStand
4、ard The preparation of this BritishStandard was entrusted by the Plastics and Rubber Standards Policy Committee (PRM/-) to Technical Committee PRM/21, upon which the following bodies were represented: British Plastics Federation British Steel Industry British Telecommunications plc British Textile C
5、onfederation Department of Trade and Industry (National Physical Laboratory) EEA (The Association of Electronics, Telecommunications and Business Equipment Industries) Electrical and Electronic Insulation Association (BEAMA Ltd.) Electrical Installation Equipment Manufacturers Association (BEAMA Ltd
6、.) GAMBICA (BEAMA Ltd.) Ministry of Defence Packaging and Industrial Films Association PIRA Plastic Industrial Containers Association Plastics and Rubber Institute RAPRA Technology Ltd. Yarsley Technical Centre Ltd. Amendments issued since publication Amd. No. Date Comments 10600 November 1999 Imple
7、mentation of the European StandardBSENISO1600:1999 BSI 04-2000 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 1 Scope 3 2 Normative references 3 3 Principle 3 4 Reagents 3 5 Apparatus 3 6 Test sample 4 7 Procedure 4 8 Expression of results 5 9 Precision 5 1
8、0 Test report 5 Annex ZA (normative) Normative references to international publications with their relevant European publications 7 Figure 1 Suitable mould 6 Publication(s) referred to Inside back coverBSENISO1600:1999 ii BSI 04-2000 National foreword This BritishStandard is the English language ver
9、sion of EN ISO1600:1999. WARNING NOTE. This BritishStandard, which is identical with EN ISO1600, does not necessarily detail all the precautions necessary to meet the requirements of the Health and Safety at Work etc. Act1974. Attention should be paid to any appropriate safety precautions and the me
10、thod should be operated only by trained personnel. 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 obl
11、igations. Cross-references Publication referred to Corresponding BritishStandard ISO585:1990 BS EN ISO585:1999 Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, theEN title page, pages2 to8, an inside back cover and a back cover. This standard has been upda
12、ted (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO1600 May1999 ICS 83.080.00 English version Plastics Cellulose acetate Determination of light absorption o
13、n moulded specimens produced using different periods of heating (ISO1600:1990) Plastiques Actate de cellulose Dtermination de labsorption de lumire sur prouvettes moules produites en utilisant diffrentes priodes de chauffage (ISO1600:1990) Kunststoffe Celluloseacetat Bestimmung der Lichtabsorption a
14、n gepreten Probekrpern, hergestellt bei unterschiedlichen Erwrmungszeiten (ISO1600:1990) This European Standard was approved by CEN on16April1999. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of
15、a national standard without 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
16、 in any other language made 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, CzechRepublic, Denmark, Finland, France,
17、Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland andUnited Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1999 CE
18、N All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref.No.EN1600:1999EENISO1600:1999 BSI 04-2000 2 Foreword The text of the International Standard from Technical Committee ISO/TC61, Plastics, of the International Organization for Standardization (I
19、SO) has been taken over as a European Standard by Technical Committee CEN/TC249, Plastics, the Secretariat of which is held by IBN. 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 by November1999, an
20、d conflicting national standards shall be withdrawn at the latest by November1999. According to CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, CzechRepublic, Denmark, Finland, France,
21、Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and theUnitedKingdom. Endorsement notice The text of the International Standard ISO1600:1990 has been approved by CEN as a European Standard without any modification.ENISO1600:1999 BSI 04-
22、2000 3 WARNING The use of this International Standard may involve hazardous materials, operations and equipment. This standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and hea
23、lth practices and determine the applicability of regulatory limitations prior to use. 1 Scope This International Standard specifies a method for the determination of light absorption of cellulose acetate, employing test specimens taken from two mouldings which have been produced using different peri
24、ods of heating. The aim is to provide quantitative measurements which are compatible with visual judgements of yellowness and lightness, and of changes in these properties after moulding. The determinations are carried out on cellulose acetate in plasticized form rather than in solution, since a mor
25、e reliable guide is thereby obtained to the performance of cellulose acetate in plastics materials. This method minimizes the effects of haze or imperfections in the specimens. This method is intended for cellulose acetate having an acetic acid yield of54% 2,5%. It may also be applicable to other tr
26、ansparent plastics which are not strongly coloured and which can be moulded under the specified conditions. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the e
27、ditions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of curren
28、tly valid International Standards. ISO565:1990, Test sieves Metal wire cloth, perforated metal plate and electroformed sheet Nominal sizes of openings. ISO585:1990, Plastics Unplasticized cellulose acetate Determination of moisture content 1) . 3 Principle The absorption of visible light by cellulos
29、e acetate is normally greatest at the blue end of the visible spectrum, and decreases continuously across the spectrum to the red end. Therefore two measurements of absorption, one at the red end and one at the blue end, are sufficient to characterize the absorption of light by the material. For the
30、 determination of the initial optical density, specimens given the smallest practicable amount of heating are used. The optical densities are measured for blue light and for red light using specified colour filters, and the optical density at25mm thickness is calculated as the “initial light absorpt
31、ion”. The “light absorption after further heating” is obtained by similar measurements on further specimens prepared using a longer period of heating during moulding. 4 Reagents During the determination, use only reagents of recognized analytical grade, free from visible colour. 4.1 Dimethyl phthala
32、te, analytical grade, 1,191 to1,195, purity more than99%(m/m). 4.2 Triacetin 4.3 Ethyl lactate 4.4 Acetone SAFETY PRECAUTIONS Acetone is highly flammable. Keep the container in a well ventilated place and away from sources of ignition. Do not smoke. Take precautionary measures against static dischar
33、ges. 4.5 Propan-2-ol SAFETY PRECAUTIONS Propan-2-ol is highly flammable. Keep the container tightly closed and away from sources of ignition. Do not smoke. 5 Apparatus Ordinary laboratory apparatus, plus the following: 5.1 Hydraulic press, capable of exerting a pressure of at least8MN/m 2on the moul
34、ding surface, with means of heating to200 C and with water cooling. 5.2 Mould (see Figure 1 for a suitable type), with polished surfaces substantially flat and parallel, to produce mouldings of thickness within the range1,5mm to5mm. A particular thickness within this range may be specified. 1) To be
35、 published. d 20 20ENISO1600:1999 4 BSI 04-2000 5.3 Photoelectric absorptiometer, to measure optical density at wavelengths in the region of440nm at the blue end of the spectrum and640nm at the red end. The arrangement of test specimen and photoelectric cell shall be such that all light emerging fro
36、m the photoelectric cell side of the specimen at angles of up to45 from the direction of the incident beam is received by the measuring system. An absorptiometer using a metal-filament lamp with filters having light transmission at440nm and640nm respectively (for example, with Chance O.B.10 2)blue f
37、ilters and Ilford608 2)red filters) is suitable. 5.4 Stainless-steel grinder, electrically operated. 5.5 Oven, capable of being thermostatically maintained at60 C 2 C or70 C 2 C. 6 Test sample 6.1 If proceeding in accordance with7.1.1 (firstmethod of incorporating the plasticizer), the sample of cel
38、lulose acetate shall be in the form of powder passing entirely through a sieve of7104m mesh size (as defined in ISO565); it shall be ground if necessary, avoiding excessive heating of the sample. If proceeding in accordance with7.1.2 (second method of incorporating the plasticizer), the cellulose ac
39、etate need not be ground. 6.2 Determine the moisture content of the sample in accordance with ISO585. 7 Procedure 7.1 Either of the methods described below may be used for the incorporation of plasticizer. 7.1.1 First method Weigh into a glass bottle, to within 0,5g, the quantity of the sample corre
40、sponding to100g of drycellulose acetate. Into another glass bottle, weigh45g of dimethyl phthalate(4.1), to within 0,5g. Slowly add the dimethyl phthalate tothe cellulose acetate with constant stirring and continue to stir for at least5min after all the dimethyl phthalate has been added. Proceed in
41、accordance with7.2 to7.9. 7.1.2 Second method Place200g, weighed to the nearest1g, of the cellulose acetate in a2litre vessel. The moisture content of the sample shall be less than0,5%; if not, there is a risk of bubbles forming in the moulding. Add about one-half of the following mixture: dimethyl
42、phthalate(4.1); 75ml 0,5 ml(90g 0,6g); propan-2-ol(4.5);400ml 0,5ml. Homogenize by mixing briskly with a glass stirrer. Pour in the rest of the solvent/plasticizer mixture, and, after having mixed again and stoppered the vessel, place it immediately on a roller mixer operating between50rpm and70rpm.
43、 After2h of mixing, tap the vessel with the palm of the hand in order to dislodge any powder which may have become stuck to the sides. Place on the roller mixer again and mix for a further4h. Pour the product into a porcelain dish, cover with a sheet of filter paper and let it stand in the open, at
44、room temperature, overnight. Then place in an oven, thermostatically maintained at60 C 2 C, and leave for3h to eliminate part of the solvent. At the end of this time, place the product in the original clean vessel again. Homogenize it for one or two minutes, by rapid mixing with a mixing rod equippe
45、d with a blade turning at10000rpm. (Thisoperation is to destroy any agglomerates that may have been produced during the stoving.) Stopper the vessel, then let it stand again at room temperature for about20h. Proceed in accordance with7.2 to7.9. 7.2 Heat the mixed material for2h at70 C 2 C to remove
46、moisture and complete the absorption of plasticizer. 7.3 Place a suitable quantity of the heated mixture in the mould(5.2), pre-heated to a temperature of200 C 2 C. Apply contact pressure for2min, then full pressure (at least8MN/m 2at the moulding surface) for a further10min 0,5min for a moulding1,5
47、mm thick. This time shall be increased by0,5min for each0,5mm above1,5mm thickness. 7.4 Release the pressure and start cooling immediately, continuing the cooling until the moulding is rigid enough to be ejected without being deformed. The rate of cooling shall be such that the mould temperature2min
48、 after the start of cooling is at least30 C below the moulding temperature. 7.5 Prepare a further moulding of the same thickness in a similar manner, but with a heating time, at full pressure, one-third of that used in7.3. 2) Chance O.B.10 and Ilford608 are examples of suitable products available co
49、mmercially. This information is given for the convenience of users of this International Standard and does not constitute an endorsement by ISO of these products.ENISO1600:1999 BSI 04-2000 5 7.6 For the measurement of the optical density, prepare two test specimens from each moulding as described in7.7. 7.7 The test specimen thickness shall not exceed13mm, and should preferably be such that the measured optical density is not less than0,06. With material of good colour, the measured optical density at the
